METHOD FOR DETERMINING AT LEAST ONE GEOMETRIC PARAMETER OF A PERSONALIZED FRAME OF EYEWEAR AND METHO

专利摘要:
The invention relates to a method for determining a value of at least one geometrical parameter for customizing a personalized spectacle frame adapted to the wearer's head, comprising the following steps: a) identifying (100) a frame of reference, b) determining (200) the value of at least one reference geometric parameter Pref on said reference mount, c) placing (300) in the use position said reference mount on the wearer's head, d) in the configuration of step c), determining (400) the value of at least one geometric-morphological reference parameter PGMref related to the relative position of said reference frame relative to the wearer's head, e) from the values of the reference geometric-morphological parameter PGMref determined in step d) and the reference geometrical parameter Pref determined in step b), determining (500) at least one value of at least one pa Pperso geometric personalization range of said custom mount.
公开号:FR3016051A1
申请号:FR1450018
申请日:2014-01-02
公开日:2015-07-03
发明作者:Carlos Rego
申请人:Essilor International Compagnie Generale dOptique SA；
IPC主号:

专利说明:

[0001] TECHNICAL FIELD TO WHICH THE INVENTION RELATES The present invention relates generally to the field of personalization of eyeglasses. It relates more particularly to a method for determining at least one geometrical parameter of a personalized spectacle frame adapted to its wearer from geomorphic data established from a reference mount positioned on the wearer's head.
[0002] BACKGROUND ART The current spectacle frames are not defined in a personalized way. The wearer and his optician choose from a limited set of mount specimen, the one that best suits, depending on the aesthetic wishes of the wearer, the optical function of the glasses (need for visual correction and / or sun protection) and the shape the wearer's face (height of circles, length of branch, curve, shape of circles ...). It is then difficult for the wearer to find a frame that meets all of his needs. In an attempt to partially overcome this imperfection, the optician makes an adjustment of the frame directly on the wearer's face, manually, according to the indications of comfort provided by the wearer and according to empirical know-how. This adjustment is long and tedious for the optician and the wearer, and its quality, which is important for visual correction, depends on the operator and the care given to this operation. It is often performed upon receipt of the finished pair of spectacles, i.e. in which the ophthalmic lenses have been mounted. This process does not always allow the realization of pairs of glasses whose optical and mechanical characteristics are precisely adapted to the wearer. There is therefore a need for the provision of a custom spectacle frame that corresponds to a geometric definition conceived from geometrical-morphological data established from a reference mount positioned on the wearer's head, that is to say of data depending on both the geometry of the frame and the morphology of the wearer. Document US4762407 discloses a method for determining the characteristics of a frame so that it is adapted to the wearer's face. In this method, the ideal placement in front of the eyes of the wearer of the ophthalmic lenses adapted to the visual correction of the wearer is firstly determined. Then the geometrical characteristics of the frame allowing this ideal placement of the ophthalmic lenses in front of the wearer's eyes are determined according to the shape of the wearer's face. The frame is finally constructed to present the geometric characteristics determined.
[0003] This method, however, does not allow to adjust a predetermined mount, already assembled, on the face of a wearer, in the absence or in the presence of ophthalmic lenses. It also proves difficult to obtain useful results exploitable without its implementation becoming too tedious and resource-consuming, especially as regards the measurement protocol and data processing. OBJECT OF THE INVENTION In order to overcome the above-mentioned drawback of the state of the art, the present invention proposes a method of determining at least one geometrical parameter of a personalized spectacle frame adapted to its wearer.
[0004] More particularly, according to the invention this method comprises the following steps: a) identifying a reference frame, b) determining the value of at least one reference geometrical parameter on said reference frame, c) placing in position of use said reference frame on the wearer's head, d) in the use position of step c), measuring the value of at least one reference geometric-morphological parameter related to the relative position of said reference frame by report to the wearer's head, e) from the values of the reference geometrical-morphological parameter in step d) and the reference geometrical parameter determined in step b), determine at least one value of at least a geometrical parameter for personalizing said personalized frame. Thus, thanks to the method according to the invention, it is possible to determine at least one geometrical parameter of customization of said custom mount to adjust this custom mount on the wearer's head so that it is properly adapted to its face. "Properly adapted" means the following: - to give the mount and the ophthalmic lenses a correct final position compatible with the optical function of the prescribed ophthalmic lenses, - to give the optical equipment comprising the frame and the ophthalmic lenses a function aesthetics in accordance with the wearer's choices, that is to say, in accordance with the choices of the overall shape of the outline of the frame and its dimensions by the wearer, the overall shape of the frame being able to be defined according to fashion criteria this overall shape and these dimensions being here adapted to the shapes of the wearer's face and to the optical function of the ophthalmic lenses.
[0005] The method according to the invention thus allows the wearer to customize an initial frame corresponding globally to his aesthetic preferences and his visual needs, in order to optimize the characteristics of the personalized frame so that it corresponds more to his needs and preferences that the initial mount, while maintaining the overall appearance of this initial mount. The shape of a mount is characterized mainly by the shape of its front face. In the case of plastic or metal frame, it is understood that the circles largely contribute to define this form. In the case of pierced or nylor frames, the shape of the frames is directly given by the shape of the ophthalmic lens. In what follows, the term "circle" designates the shape of the contours of the front face of the telescope, by analogy this term can also designate the shape of the contour of the ophthalmic lenses for pierced or nylor frames. It is thus considered that the eyeglass frame is correctly positioned on the wearer's face when the following conditions are simultaneously satisfied: the circles of the frame are positioned relative to the eyes of the wearer so as to enable the ophthalmic lenses to perform their function optical, - the eyeglass frame rests on the nose, without slipping and without injuring, with all the necessary stability, - the branches of the eyeglass frame rest on the wearer's ears, without exaggerated compression on the temples, without excessive traction on the ears, - the proportions of the frame of glasses are in adequacy with the aesthetic choices of the wearer. For example, in the case of progressive ophthalmic lenses, it is necessary to define a minimum height dimension for the circles of the custom mount so that the wearer enjoys a comfortable near-vision zone. This dimension depends directly on the position of the circles of the custom mount in front of the eyes of the wearer. In addition, it is important to properly proportion the dimensions of the frame or its forms as a function of the characteristics of the wearer and or use it will have. Once this geometrical customization parameter is determined, it is possible either to apply it to the reference eyeglass frame by deforming it to obtain the personalized frame, or to manufacture the custom frame according to this personalized geometrical parameter. The manufacture may possibly consist of an assembly of predefined elements. It can also be a manufacture by molding, machining or printing in three dimensions. This process is preferably carried out before the manufacture of ophthalmic lenses intended to be mounted in the frame.
[0006] The determination of a personalized optical equipment, including the frame and the ophthalmic lenses, further makes it possible to jointly establish the positioning data of this frame and of these ophthalmic lenses relating to the wearer. This "calculated" data can advantageously be substituted for a second series of measurements made with the personalized frame, and this for the purposes of optimized calculation of ophthalmic lenses. The production of ophthalmic lenses is then more precise because the optimization is carried out with the geometric and positioning parameters of the personalized frame. Other nonlimiting and advantageous features of the method according to the invention are the following: the value of said geometrical parameter of personalization is determined so that the personalized frame is fitted to the wearer's head in accordance with at least one criterion of personalization fitting comprising a constraint on at least one geometric-morphological personalization parameter related to the relative position of said personalized frame relative to the wearer's head; said customization adjustment criterion comprises a constraint on at least one of the following geometric-morphological personalization parameters: a relative position of the branches of the personalized mount relative to the wearer's ears; a spacing of the branches of the personalized frame, defined according to a determined difference between the ears, - optimization of the contact surface between the nose support elements of the personalized frame and the nose of the wearer, - a relative position of the circles of the personalized frame and the eyes of the wearer, a relative position of the contour of the ophthalmic lenses mounted on the personalized frame and the eyes of the wearer, a distance between at least one singular point of the personalized frame and a singular point of the wearer's head; a distance between at least one singular point of the contour of the ophthalmic lenses mounted on the personalized frame and a point if uniform of the head of the wearer, - an angle between a straight line connecting the highlights of the cheekbone (JS) and the brow bone (SCS) and the average plane of the circle (PMC) of the reference frame arranged opposite, measured in a plane perpendicular to said mean plane of the rim of the mount, - an angle between a straight line connecting the sphenoid point (P1) and a point (PN) of the wearer's nose flange and the average plane of the circle (PMC) corresponding mount, measured in a plane parallel to the Frankfurt plane (PF) of the wearer's head; the personalized frame being intended to accommodate ophthalmic lenses for visual correction, the value of said geometric customization parameter of the personalized frame is determined according to the visual correction made by the lenses; the geometrical customization parameter determined in step e) comprises at least one of the following parameters: the curve angle, the pantoscopic angle, the length of the branches, the width of the bridge, the height of the nasal support elements , the shape or one of the dimensions of the personalized frame, the positioning or the orientation of the support elements of the personalized frame on the nose of the wearer; shape refers to the shape of the circles (or ophthalmic lenses in the case of a pierced mount or nylor), this shape being obtainable by a reader of the shape reader type described in the document US5121548; in step d), the measurement of the geometric-morphological reference parameter comprises the capture of at least one image of the wearer's head equipped with the reference frame; in particular, the orientation of the shooting can be performed according to the schematic orientations of Figures 3 and 4; in step d), said at least one geometric-morphological reference parameter comprises at least one of the following geometrical quantities: a relative position of the branches of the reference mount relative to the wearer's ears; branches of the reference frame associated with a determined distance between the ears, - an evaluation of the contact area between the nose support elements of the reference frame and the nose of the wearer, - a relative position of the circles of the frame and eyes of the wearer, - a relative position of the contour of the ophthalmic lenses mounted on the reference frame and the eyes of the wearer, - a distance between at least one singular point of the reference frame and a singular point of the head of the wearer, - a distance between at least one singular point of the contour of the ophthalmic lenses mounted on the reference frame and a singular point of the head of the carrier - an angle between a straight line joining the cheekbone (JS) and the brow bone (SCS) and the average circle plane (PMC) of the reference mount opposite, measured in a plane perpendicular to the mean plane of the rim of the mount, - an angle between a line connecting the sphenoid point (P1) and a point (PN) of the wearer's nose wing and the corresponding average plane of the rim (PMC) of the rim, measured in a plane parallel to the Frankfurt plane (PF) of the wearer's head; in step c), the use position is such that the reference frame is fitted to the wearer's head in accordance with at least one reference adjustment criterion; said reference adjustment criterion comprises a constraint on at least one of the following geometrical magnitudes: a relative position of the branches of the reference frame with respect to the wearer's ears; a spacing of the branches of the reference frame , defined according to a determined difference between the ears, - an optimization of the contact surface between the nose support elements of the reference frame and the nose of the wearer, - a relative position of the circles of the reference frame and the eyes of the wearer, - a relative position of the contour of the ophthalmic lenses mounted on the reference frame and the eyes of the wearer, - a distance between at least one singular point of the reference frame and a singular point of the wearer's head a distance between at least one singular point of the contour of the ophthalmic lenses mounted on the reference frame and a singular point of the wearer's head; ngle between a line connecting the highlights of the cheekbone (JS) and the brow bone (SCS) and the average plane of the circle (PMC) of the reference frame arranged opposite, measured in a plane perpendicular to said average plane of the circle of the mount, - an angle between a straight line connecting the sphenoid point (P1) and a point (PN) of the wearer's nose wing and the corresponding mean plane of the mount's circle (PMC), measured in a plane parallel to the Frankfurt plane (PF) of the wearer's head; in step c), in order to place the reference frame on the wearer's head in the use position, a real placement of the reference frame on the actual head of the wearer is carried out; in step c), in order to place the reference frame on the wearer's head in the use position, the following sub-steps are carried out: determining a numerical modeling at least partially of the wearer's head, with, in a first common referential, at least one model of a part of the nose, a model of part of the ears, - perform a simulation of the positioning of the reference frame on the wearer's head, by superimposing by a numerical calculation, on modeling the wearer's head, the corresponding zones of a numerical modeling of said reference frame; step c) comprises the following sub-step: determining the modeling of the reference frame with, in a second common frame of reference, at least one model of a part of the bridge of the reference frame and a model of a part of the branches of the reference frame, the simulation of the positioning of the reference frame on the wearer's head, being performed by superimposing, on the one hand, the model of a portion of the bridge of the reference frame and the model (MN) of a portion of the nose of the wearer, and, secondly, the model of a portion of the branches of the reference frame and the model of part of the ears of the wearer. The invention also relates to a method for determining a custom mount, according to which a value of at least one geometrical parameter of customization of said personalized frame is determined in accordance with the method described above, and a geometrical definition of said personalized frame is determined. according to said personalization geometrical parameter and a frame shape chosen by the wearer, the geometric definition of said personalized frame including access to a frame register containing, associated with each frame, an identifier of the frame shape and at least one geometrical parameter of this frame and the search in this register of at least one mount whose shape corresponds to the mounting shape chosen by the wearer and whose geometry satisfies, with a predefined tolerance, the geometric parameter of said custom mount. The invention also relates to a method for determining a personalized frame, according to which a value of at least one geometrical parameter of customization of said personalized frame is determined in accordance with the method described above and a geometrical definition of said personalized frame is determined. function of said customization geometrical parameter and a frame shape chosen by the wearer, the geometrical definition of said personalized frame comprising the following sub-steps: an initial frame having the shape desired by the wearer is determined and a definition is acquired initial geometric predefined of this initial mount; this initial geometric definition is deformed so that the geometrical definition of the personalized frame, resulting from this deformation, conforms to said geometrical parameter of personalization. Then, advantageously: the geometric definition of the personalized frame comprises the assembly of geometric definitions of at least two main parts of the frame among the branches, the nose support elements and the circles, each of these two main parts assembled being respectively selected by a search in a register containing different shapes and / or dimensions of realization of the part concerned, of at least one shape and / or dimension of this part corresponding to the frame shape chosen by the wearer and whose geometry satisfied, with a predefined margin of tolerance, with the geometrical parameter of personalization; - From said geometric definition, the customized frame is made at least partially by additive rapid prototyping or machining. DETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT The following description with reference to the accompanying drawings, given as non-limiting examples, will make it clear what the invention consists of and how it can be achieved. In the accompanying drawings: FIG. 1 is a schematic perspective view of a reference eyeglass frame (solid lines) and partial modeling of the wearer's head (dashed lines), FIG. schematic from above of the reference eyeglass frame and the partial modeling of the head of FIG. 1; FIG. 3 is a schematic view of the profile of the wearer's head with the reference eyeglass frame, FIG. 4 is a diagrammatic front view of the wearer's head and the reference eyeglass frame of FIG. 3; FIGS. 5 and 6 illustrate a correct fit of a branch of the reference eyeglass frame on the ear of the Figure 7 is a schematic view of the various steps of the method according to the invention. The invention relates to a method for determining a value of at least one geometrical parameter for customizing a personalized spectacle frame adapted to the wearer's head from geometrical-morphological data for positioning a reference frame. on the wearer's head, comprising the following steps (FIG. 7): a) identifying (100) the reference frame, b) determining (200) the value of at least one reference geometric parameter P, -ef on said frame reference, c) placing (300) in use position said reference mount on the wearer's head, d) in the use position of step c), determining (400) the value of at least one PGM geometric-morphological reference parameter, -f related to the relative position of said reference frame relative to the wearer's head, e) from this value of the reference geometric-morphological parameter PGMref determined at step d) and the reference geometrical parameter Pref determined in step b), determining (500) at least one value of at least one personal geometry parameter PGM -pers () of said personalized frame. Step a) (Block 100 of Figure 7) In this step, a reference mount 10 is identified. This reference frame is standard and not personalized. This reference frame 10 may in particular be chosen by the wearer from among a set of reference frames which are proposed to him. It can choose according to aesthetic criteria, but also taking into account criteria related to the visual correction to be provided by the lenses to be mounted in the mount.
[0007] This visual correction may for example require that the circles of the frame are sufficiently large, for example for progressive lenses, or that the curve of the frame is not too strong, for example for corrective lenses of myopia. In Figures 1 to 4, there is shown an example of reference frame 10 of glasses chosen by the wearer. In the example illustrated, the reference frame is of rimmed type, that is to say that the frame 10 has circles 11, 12 in which the ophthalmic lenses are adapted to be mounted. These two circles 11, 12 are rigidly connected by a nasal bridge 13. Each circle 11, 12 is also connected to a branch 14, 15, usually articulated on the corresponding circle. It will be considered in the following that the branches are fixed in their open position relative to each other. The nasal bridge 13 has two bearing surfaces 16 on the wings of the nose 20 of the wearer (Figure 1). These bearing surfaces 16 may be fixed, for example in the case of a plastic reference frame in which these surfaces are integrated in the circles of the frame, or be adjustable, for example in the case of a reference mount metal in which there is provided two plates 16A each connected to the nasal bridge by an arm 17 (Figures 1 and 2). It is this latter case which is shown in the figures. The pads 16A can also be connected directly to the circles of the reference frame. The plates 16A carrying the bearing surfaces 16 of the frame 10 on the wearer's nose mainly have two adjustable parameters: on the one hand the distance from the wafer 16A to the circle 11, 12 of the frame 10 and on the other hand the inclination of the plate 16A according to a front angle and a hunting angle defined later. In the case of the plastic mounts described above, the position and inclination of the support surfaces of the frame on the wearer's nose are predetermined and fixed. Each branch 14, 15 of the frame 10 comprises at least a first portion whose end is connected to the circle 11, 12 corresponding. This first part may be straight (Figure 5) or have a slight curvature allowing it to marry the contour of the TS head of the wearer. In the example shown in the figures, each branch 14, 15 of the frame 10 further comprises a second portion in the form of a spatula 14A, 15A extending the first portion of the branch 14, 15 at the end opposite the circles 11, 12 of the frame 10.
[0008] This spatula 14A, 15A forms the curved end of the branch 14, 15 corresponding. It is intended to be placed behind the corresponding ORD ear ORG of the wearer (see Figure 6). Alternatively, the branches of the frame do not have spatulas. In this case, it is the free end of the first part of the branch which rests on the ear of the wearer. This variant is shown in dashed lines in FIG. 6. In another variant, the reference frame may be of pierced type, that is to say that the ophthalmic lenses are pierced and each maintained by one end of the nasal bridge and one end. of the branch associated with the lens, which cooperate with drilling holes. This type of mount is similar to that described above, except that it does not have circles. The nasal bridge and branches are similar. In general, the reference frame 10 has a plane of symmetry PS passing through the middle of the nasal bridge 13 and equidistant from the branches 14, 15 of the frame 10.
[0009] In addition, the first part of the two branches 14, 15 extends in the same mean plane PB. As represented in FIGS. 1 and 2, a first frame associated with the frame 10, that is to say in which the frame 10 has a position and a fixed orientation, having an orthonormal frame (01, X1, Y1) is defined. , Z1). The center 01 of the reference mark of this first reference frame is, for example, the middle of the nasal bridge 13. The axis 01Z1 is parallel to the intersection of the plane of symmetry PS of the frame 10 and the average plane PB of the branches 14, 15 The axis 01Y1 extends in the plane of symmetry PS of the frame 10, in the direction opposite to the circles of the frame. The axis 01X1 extends parallel to the average plane of the branches PB.
[0010] The plane 01Y1Z1 then corresponds to the plane of symmetry PS of the frame 10. The plane 01X1Z1 is parallel to the average plane of the branches PB. The plane 01X1Y1 is called vertical plane PVM mount. The flush angle of each wafer corresponds to the inclination of the contact surface of the wafer relative to the plane 01Y1Z1 of the frame 10, measured in projection in the plane 01X1Z1. The front angle of each wafer 16A corresponding to the inclination of the contact surface of the wafer with respect to the plane 01Y1Z1, measured in projection in the plane 01X1Y1. In general, the reference mount 10 may be a real mount, which the wearer chooses in store. The reference frame 10 may comprise non-corrective presentation lenses or no lenses. It can also be a virtual reference frame, which the wearer can choose from catalog or online for example. This virtual reference frame is associated with a three-dimensional model or with a set of measurements of lengths and characteristic angles of this reference frame or with the coordinates in the same frame of a set of particular points of the frame. reference. The virtual reference frame can also be determined by performing at least partial modeling of a real reference mount. The virtual reference frame comprises an at least partial modeling of the reference frame, with, in said first reference frame (01, X1, Y1, Z1), at least one model of a portion of the bridge 13 of the reference frame 10 and a model of part of the branches 14, 15 of the reference frame 10. A model of a part of the circles 11, 12 of the reference frame 10 is preferably furthermore determined. This virtual reference frame can be constituted for example by a set of measurement lengths and angles characteristic of the frame. These measurements comprise, for example, for the model of part of the branches: the length of the first part of the branches 14, 15, the length of the spatula 14A, 15A, the distance between the branches 14, 15, the angle between the spatula 14A, 15A and the first part of the corresponding branch 14, 15 in the plane 01Y1Z1 and in the plane 01X1Z1.
[0011] For example, for the model of a part of the bridge, they comprise: the distance between the bearing surfaces 16 of the bridge 13 on the nose, the angle formed between bearing surfaces 16 and the distance of these surfaces from support for the circles of the mount 10.
[0012] For the model of the circles 11, 12, for example, they comprise: the diameter of each circle 11, 12 in the plane 01, X1, Z1, the measurement of the curve GD, GG, corresponding to the angle formed between each circle 11, 12 and the plane 01X1Y1 or vertical plane PVM mount (Figure 2), and the position of the highest and lowest points of the circles 11, 12 in the plane 01Y1Z1.
[0013] From these measurements of lengths and angles, it is possible to reconstruct a model of the reference frame. This reconstruction can take into account other parameters, such as the material of the frame or the thickness of the branches and circles. The modeling of the reference frame can also be constituted by the data of the position in the first reference frame (01, X1, Y1, Z1) of a certain number of particular points of the reference frame 10. This modeling or mounting of virtual reference may finally be the result of a three-dimensional image acquisition of the real reference frame 10. This acquisition can be made for example using a stereoscopic image acquisition device or using a three-dimensional scanner. Whatever the method of obtaining the virtual reference frame, it is stored in the aforementioned computer and electronic means. It is thus possible to have, in this memory, a database comprising the modelizations of a set of available reference frames, which are determined in advance. These steps of determining the virtual reference frame are implemented by computer and electronic means programmed for this purpose. Step b) (block 200 of FIG. 7) Whether the reference frame is real or virtual, the value of at least one reference geometrical parameter of this reference frame is determined in step b). This geometric reference parameter provides a reference for determining, as explained later, the changes to be made to the initial mount to obtain the custom mount. This geometric parameter of reference is for example chosen from the following: shape of the outline of the circles of the frame or ophthalmic lenses, pantoscopic angle, curve, length of the branches, width of the frame, shape of the bridge, base of the frame. This geometric reference parameter is intended in particular to allow the scaling of the images captured in step c). In practice, it is preferably a characteristic length of the reference frame. This may include the overall diameter of a circle 10 of the reference frame. This geometric parameter has the advantage of being able to be determined on a captured image from the front. When the circle of the reference frame is known via its length and width data, the front view or profile view can be used to establish the value of the reference geometrical parameter. Indeed, in this case, the profile view gives access to the vertical dimension of the frame. It may be any other length, for example the length of the first part of the branches 14, 15, the length of the spatula 14A, 15A, the distance between the branches 14, 15, the angle between the spatula 14A , 15A and the first part of the corresponding branch 14, 15 in the plane 01Y1Z1 and in the plane 01X1Z1, bridge width ... The value of this reference geometrical parameter can be determined either by a measurement made on the mount of actual reference, either by calculation according to the data of the virtual reference frame stored in memory. Step c) (block 300 of FIG. 7) In step c), said reference frame is placed in the position of use on the wearer's head. As mentioned above, the reference frame 10 can be real or virtual. In the case where the reference mount 10 is a real mount, it is actually placed in step c) on the actual wearer's head. It is preferably the optician who performs this step. Step c) then corresponds to a fitting step of the reference frame. The optician makes sure that the positioning is relatively good. Indeed, the position of use, in which the measurement of the geometric-morphological parameter of step d) is performed, is preferably such that the reference frame is fitted to the wearer's head. This adjustment is made empirically by the optician. In the case where the reference frame is a virtual reference frame, the computer and electronic means perform a simulation of the positioning of the frame 10 on the wearer's head TS, by superposing, at least partially, on the one hand, the frame virtual reference and, on the other hand, at least partial modeling of the wearer's head. This modeling can in particular be constituted by a representation of the wearer's head determined from a captured image of the wearer's head. The modeling of the wearer's head is determined either in real time so as to perform a virtual fitting of the reference frame on the wearer's head, or in an optional preliminary step.
[0014] The real-time modeling of the wearer's head is preferably subject to a display in real time. Whether the determination of the modeling of the wearer's head is made in real time or in a preliminary step, it can be done either by the choice, in a database, of a generic modeling, or by determination of a modeling specific to the wearer's head. In the case of the determination of a generic modeling of the wearer's head, the modeling of the wearer's head is selected from a predetermined modeling group according to selection criteria such as sex, age, ethnic category. a simplified measurement such as the size of the wearer's cranial perimeter. In the case of determining a specific modeling of the wearer's head, step c) comprises the following substeps: determining a numerical modeling at least partially of the wearer's head TS, with, in a first reference frame common, at least one MN model of a part of the nose N, a model MORD, MORG of a part of the ears ORD, ORG (Figure 1), - perform a simulation of the positioning of the reference frame 10 on the TS head of the carrier, by superimposing by a numerical calculation, on the modeling of the wearer's head TS, the corresponding zones of a numerical modeling of said reference frame.
[0015] As shown in FIG. 3, a second reference frame associated with the wearer's head TS, that is to say in which the wearer's head TS has a position and a fixed orientation, having an orthonormal reference (02, X2) is defined. , Y2, Z2).
[0016] The Frankfurt PF plane of the wearer's TS head is defined as the plane passing through the OR's lower orbital points and the wearer's PO porion, the porion being the highest point of the auditory canal's skull, which corresponds to the tragedy of the ear (Figure 3). It is considered that the wearer is in an orthostatic position, position in which he achieves a minimum of effort. The axis of gaze of the wearer is the primary axis of gaze, that is to say, he looks straight ahead. The plane of Frankfurt PF is then horizontal. A sagittal plane PSAG of the wearer's head TS is defined as being the vertical plane passing through the mediator AO of the two eyes OG, OD. The mediator 15 AO of the eyes is the axis passing in the middle of the segment defined by the centers of rotation of the two eyes and parallel to the plane of Frankfurt PF. The AMV pantoscopic angle is defined as the angle between the mean plane of each circle PMC of the frame 10 and the vertical plane eye PVO, which is the plane perpendicular to the axis of the gaze in the orthostatic position. Preferably, the vertical eye plane PVO also corresponds to the plane perpendicular to the Frankfurt plane passing through the centers of rotation CROG, CROD of the eyes, measured in projection in the sagittal plane of the head TS of the wearer. The center 02 of the reference of this second frame of reference is, for example, the middle of the segment connecting the centers of rotation of the eyes OD, OG of the wearer. The axis 02Z2 is located in the sagittal plane PSAG of the wearer's head TS and is parallel to the plane of Frankfurt PF. It extends in a direction away from the wearer's head. The axis 02Y2 extends in the sagittal plane PSAG of the head TS of the wearer and is perpendicular to the Frankfurt plane PF. The axis 02X2 extends parallel to the plane of Frankfurt PF. Alternatively, any other frame of the frame and / or the head of the wearer may be considered. The modeling of the wearer's head comprises, for example, in said second reference frame (02, X2, Y2, Z2), at least one MN model of a part of the nose N and a model MORD, MORG of a part of the ears ORD ORG of the wearer. In addition, a model MOD, MOG of a part of the eyes of the wearer is preferably determined. These models are schematically represented in FIGS. 1 and 2 by dotted lines. The MN model of a portion of the nose preferably comprises, for example, the width of the root of the nose N, the face angle AFN (FIG. 4) of the nose, the flush angle ACN of the nose (FIG. 2). The model MORD, MORG of a portion of each ear of the wearer has the coordinates of a curved surface corresponding to the groove S located between the horn of the ear ORD, ORG and the skull of the wearer, at the back of the ear (Figures 5 and 6). It is indeed on this groove S that rests the corresponding branch 14, 15 of the spectacle frame 10. Also preferably, a model of a portion of the cheekbones J and / or eyebrows SCD, SCG (Figures 3 and 4) of the wearer's head is determined. This modeling is preferably the result of a three-dimensional image acquisition of the wearer's head TS. This acquisition can be made for example using a stereoscopic image acquisition device or using a three-dimensional scanner.
[0017] The acquisition of three-dimensional images is preferably carried out for the head TS of the wearer of face (Figure 4), of profile (Figure 3) and the turn of the ears. It is preferably an accuracy of 2 degrees of angle and two millimeters on the distances. It can be performed by an outside operator, for example by the optician in his shop. It can also be envisaged that it is carried out remotely, for example by the wearer himself at home, and then transmitted to the operator responsible for determining the custom mount. Modeling of the wearer's head can also be achieved by capturing one or more two-dimensional images of the wearer's head.
[0018] Whatever the image capture device used, 2D or 3D, is recorded in correspondence with the captured images information indicating the scale of the captured image. This may be the image of a scale indicator disposed on the wearer's head, for example an element comprising a pattern of known dimensions, attached to the wearer's head or on a spectacle frame or the gap inter-pupillary known to the wearer. This information may also be provided by or received by the image capture device. This specific modeling of the wearer's head is also stored in the computer and electronic means. It is then necessary to superimpose by calculation the modeling of the frame 10 and the modeling of the head TS of the wearer. More precisely, the model of a portion of the bridge 13 of the reference frame 10 and the model MN of a portion of the nose N of the wearer are superimposed on one hand, and on the other hand, the model of part of the arms 14, 15 of the reference frame 10 and the model MORD, MORG of a part of the ears ORD, ORG of the wearer. In doing so, it also realizes an adjustment of the reference frame on the wearer's head according to reference adjustment criteria. Said reference adjustment criterion comprises a constraint on at least one of the following geometric quantities: a relative position of the branches of the reference frame with respect to the ORD ears of the wearer, a spacing of the branches 14, 15 of the reference frame, defined as a function of a determined difference between the ears ORD, ORG, - an optimization of the contact surface between the nose support elements 16A of the reference frame and the nose N of the wearer a relative position of the circles 11, 12 of the reference frame and the eyes OD, OG of the wearer, a relative position of the contour of the ophthalmic lenses mounted on the reference frame and the eyes OD, OG of the wearer, a distance between at least one singular point of the reference frame and a singular point of the wearer's head, and / or - a distance between at least one singular point of the contour of the ophthalmic lenses mounted on the frame of reference and a singular point of the wearer's head. Said constraint must make it possible to ensure: - the maintenance of the axis 01X1 parallel to the axis 02X2 in order to guarantee the horizontality of the reference mount 10, - the centering of the eyes OD, OG with respect to the circles 11, 12 of the frame 10 to ensure correct placement of the eyes in front of the circles of the reference frame, and - the maintenance of a target value of the gap between the eyes OD, OG and the circles 11, 12 of the mount 10, to ensure that the eyes of the wearer are located at a satisfactory distance from the frame, in the direction 01Z1. The distances between a singular point of the wearer's head and at least one singular point of the reference frame or at least one singular point of the contour of the ophthalmic lenses mounted on the reference frame may be minimum, maximum or target distances. This is for example the distance between the circles of the reference frame and the cheekbones and / or the eyebrows of the wearer or the distance between one of the canthus of the eye of the wearer and a point of the mount of reference 10. The singular point of the wearer's head is then for example one of the canthus of one of the eyes, the most prominent point of one of the cheekbones, one of the eyebrows SCD, SCG or one of the eyebrows SC in a predefined plane. The canthus of the eye is the notch located at each corner of where the two eyelids meet. The inner canthus is on the side of the nose while the outer canthus is located near the temporal region of the skull. The singular point of the reference frame or contour of the ophthalmic lenses mounted on the reference frame is then for example one of the highest or lowest points of one of the circles of the reference frame 25 when it is worn by the wearer. In practice, the optician can more precisely take into account: the maximization of the contact surface 16 between the plates 16A of the bridge 13 and the wearer's nose, the maximization of the contact between the arms 14, 15 of the frame of Reference 10 and groove S of the ears ORD, ORG of the wearer, - the minimization of the contact areas between the circles 11, 12 of the reference frame 10 and the cheekbones J and / or the eyebrows SCD, SCG of the wearer, a target value of the spacing of the branches 14, 15 of the reference frame 10, - a target value of the gap between the platelets 16A, - a target value of the gap between the eyes OD, OG and the circles 11 , 12 of the reference frame 10, - a target value of the gap between the circles of the frame 10 and the eyebrows and / or the cheekbones of the wearer. The following example gives a method of possible realization of the digital overlay of the two models with adjustment of the reference frame on the wearer's head.
[0019] It is initially considered that the first and second reference frames (01, X1, Y1, Z1) and (02, X2, Y2, Z2) of the frame and the head are merged, then their relative positioning is optimized, while maintaining the axis 01X1 parallel to the axis 02X2. The horizontality of the frame on the wearer's head is thus ensured. The first reference (01, X1, Y1, Z1) of the translation mount is thus displaced in the plane (02, Y2, Z2), in translation along the axis 02X2, and in rotation along this axis 02X2 of the second reference frame. the head. We call DY, DZ the translation distances of the first reference (01, X1, Y1, Z1) according to 02Y2 and 02Z2 and is called DtetaX, the rotation angle of the first frame (01, X1, Y1, Z1) of the frame next 02X2.
[0020] We then define a function with three parameters F (DY, DZ, DtetaX) whose value is minimal when the values DY, DZ, DtetaX best simulate the positioning of the modeling of the frame on the modeling of the head. For example, the function F is minimal when maximizing the contact area between the nose pads of the frame and the wings of the nose of the wearer, or when the distance between the nose pads of the frame and the wings of the nose is minimal, and when the contact between the branches of the frame and the top of the groove S of the ears of the wearer is maximum, or when the distance between each leg of the frame and the groove S of the corresponding ear is minimal. Thus, the function F can for example be written in the following form: F (DY, DZ, DtetaX) = alpha1.F1 (DY, DZ, DtetaX) + alpha2 .F2 (DT, DZ, DtetaX), where - the function F1 is a function presenting a minimum when the contact between the nose pads of the frame and the wings of the nose, and - the function F2 is a function presenting a minimum when the contact between the branches and the grooves of the ears is maximal, - alpha1 and alpha2 are positive weights. The Fi functions represent the different reference adjustment criteria taken into account. In practice, the parameter DY is representative of a height of the positioning of the bridge of the frame on the nose, the parameter DZ is representative of a distance between the eyes and the circles of the frame, and the parameter DtetaX is representative of an angle of inclination of the arms of the frame relative to the axis 02Z2 of the second frame of the wearer's head. It is also possible to optimize only the parameters DY, DZ, considering that the branches of the frame are parallel to the axis 02Z2 of the second frame of reference.
[0021] We then have a function F3 of two parameters F3 (DY, DZ). In the example developed above, the values of the parameters DY, DZ, DtetaX are sought by minimizing the function F by conventional optimization methods, for example by the gradient method or the LevenbergMarquardt method.
[0022] Other functions Fi (i> 2) can be introduced into the optimization function F with alpha weighting factors, in order to determine more precisely the relative positioning of the modeling of the frame on the modeling of the wearer's head, by example functions to take into account the weight of the frame, the coefficient of friction of the frame on the skin. These weighting factors can also be determined according to the particular wishes of the wearer. This may wish for example a higher or lower positioning of the frames on the nose of the wearer. The mount is indeed often positioned lower on the nose for a reading position.
[0023] The factors alpha1, alpha2, alpha of weighting make it possible to take into account the relative importance of the various functions considered. It is for example possible to minimize certain weighting factors to allow easier adjustment of the frame. At the end of the optimization, a virtual positioning of the modeling of the real reference frame 10 or of the virtual reference frame on the modeling of the wearer's head, which is representative of the positioning of the frame, has thus been realized. reference 10 on the wearer's TS head. Step d) (block 400 of FIG. 7) Once the frame is placed on the wearer's head, the value of at least one geometric-morphological parameter related to the relative position of said reference frame relative to the head is measured. of the carrier, hereinafter referred to as the geomorphologic reference parameter PGM, -f. The realization of this step is obviously different depending on whether the positioning of the reference frame on the wearer's head is real or virtual. In the case where the positioning of the reference frame on the wearer's head is real, the following two embodiments are envisaged. According to a first embodiment of this step d), this measurement is made from at least one captured image of the wearer equipped with the reference frame. An image capture device such as a camera or a digital camera is used for this purpose. At least one image capture of the wearer's head is then performed in step d). This image capture is preferably performed by the optician. Preferably, the optician captures at least two images of the wearer's head, viewed from two different angles. By this is meant that the orientation of the wearer's head with respect to the image capture plane is different during the two image captures.
[0024] For example, a first image of the head of the wearer of the face and a second image of the head of the profile wearer are captured. Then, from a processing of the captured image (s), the geomorphologic reference parameter (s) PGM, ef searched, is determined.
[0025] According to a second embodiment of step d), the geometric-morphological reference parameters PGM, -ef sought on the wearer's head are manually measured. In this case, the optician uses traditional measuring tools, for example an optician's rule, a rhinometer for specific measurements of the nose, a cephalometer for specific measurements of temples or head gaps, a protractor for any angle measurement. In the case where the positioning of the reference frame on the wearer's head is virtual, this positioning is performed by calculation. From the data in memory, the computer and electronic means are then programmed to determine by calculation the values of the geomorphologic reference parameters PGM, -ef searched as a function of the superimposition of the models of the wearer's head and the frame of virtual reference determined previously in step c). Whatever the embodiment envisaged for carrying out this step d), in practice the geometric-morphological parameters of reference PGM, -ef sought depend both on the geometry of the reference frame and the morphology of the wearer's head. . Geometry of the reference frame means the dimensions of this frame, for example the diameter of the circles, the length of the branches or the length of the bridge, as well as the characteristic angles of this reference frame, in particular the GD curve angles. , GG and the AMV pantoscopic angle (Figures 2 and 3). By morphology of the wearer's head TS, the dimensions of the wearer's head, the position of the eyes, cheekbones, eyebrows or nose on the wearer's head, the shape of the eyebrows and the nose are particularly understood. The dimensions of the head TS of the wearer include measurements of the width L 1, L 2, L 3 of the head TS measured as the distance between two points P 1, P 2, P 3 located on either side of the head, at the intersection with a PP plane parallel to the plane of Frankfurt PF and passing through the internal canthus CID, CIG or external CED, CEG eyes (see Figure 4). In particular, the sphenoidal points P 1, P 2, and P 3 of the wearer's head are defined (see FIGS. 4 and 5). The sphenoidal points P 1 are situated on either side of the wearer's head TS, at the level of the sphenoid bone of the skull. We consider two points located on a horizontal line, that is to say parallel to the plane of Frankfurt PF and parallel to the vertical plane eye PVO. The pair of sphenoid points considered will correspond, for the implementation of the method, to the pair of points separated by a minimum distance. The temporal points are located on both sides of the wearer's head, at the temporal bone of the skull. We consider two points located on a horizontal line, that is to say parallel to the plane of Frankfurt and parallel to the vertical plane eye PVO. The pair of temporal points considered will correspond, for the implementation of the method, to the pair of points separated by a minimum distance. These sphénoïdes and temporal points are for example defined in the document entitled "L'opticien Lunetier" by Caroline Kovarki edited by Lavoisier - Edition TEC & DOC, in 2009, in Chapter 33 on the taking of measurement, on pages 1473 and following . The supraauricular points are located on either side of the wearer's head, in correspondence with the highest point of the groove of the ear. The upper atrial difference corresponding to the distance between these two supereroauricular points is the difference between the grooves S of the right ORD and left ORG ears. More precisely, said at least one geomeric and morphological reference parameter determined in step d) comprises, for example, one of the following geometric quantities: a relative position of the branches of the reference frame relative to the ORD ears, ORG of the carrier, - a spacing of the branches 14, 15 of the reference frame 10 associated with a determined gap between the ears ORD, ORG, - an evaluation of the contact surface between the nose support elements 16A of the frame of reference 10 and the nose N of the wearer, - a relative position of the circles 11, 12 of the reference frame 10 and the eyes OD, OG of the wearer, - a relative position of the contour of the ophthalmic lenses mounted on the reference frame 10 and eye OD, OG of the wearer, - a distance between at least one singular point of the reference frame 10 and a singular point of the wearer's head, - a distance between at least one singular point of the contour ophthalmic lenses mounted on the reference frame 10 and a point of the wearer's head; - an angle between a line connecting the salient points of the cheekbone JS and the brow bone SCS and the mean plane of the circle PMC of the reference frame disposed opposite, measured in a plane perpendicular to said mean plane of the frame of the frame, - an angle between a line connecting the sphenoid point P1 and a point PN of the nose wing of the wearer and the average plane of the corresponding PMC circle of the mount, measured in a plane parallel to the plane of Frankfurt PF of the wearer's head.
[0026] In particular, said at least one geometric-morphological reference parameter of step d) preferably comprises a distance between at least one singular point of the reference frame and a singular point of the wearer's head, from the following distances: distance between a point of the circles of the reference frame 10 and a point of the cheekbones of the wearer, for example the distance L4 between the lowest point 11B, 12B of the circle 11, 12 of the reference frame 10 and the point le more salient JS of the corresponding cheekbone J of the wearer, measured in projection in a plane parallel to the Frankfurt plane of the wearer's head (FIG. 4), - distance between a point of the circles of the reference frame and a point of the SCD eyebrows , SCG of the wearer, for example the distance L5 between the highest point 11H, 12H of the circle 11, 12 of the reference frame and the most salient point SCS of the eyebrow SCD, SCG or the corresponding eyebrow SC e of the carrier, measured in projection in a plane parallel to the Frankfurt plane of the wearer's head (FIG. 4), - distance between a point in the wearer's eyes and a point associated with the reference frame, for example the distance between the one of the CI, CE of the eye ORD, ORG and the average plane PMC of the circle of the corresponding reference frame, - distance L6, L7 between each sphenoid point Pi, temporal P2 and / or superauricular P3 and the branch 14 Corresponding to reference frame 10 (FIG. 5), distance L8, L9, L10 between each sphenoid point Pi, temporal P2 and / or superauricular P3 and the mean plane of the circle PMC of the corresponding reference frame 10 (FIG. 5), - distance L11 between a point of the nose flange PN and the nearest point of the circle 11, 12 of the reference frame 10, the point of the nose flange being for example a point of the wing of the nose belonging to a plane parallel to the plane of Frankfurt and passing through the canthu s internal or external eyes of the wearer. The reference geometric-morphological parameter can also be related to the relative position of a set of points of the reference frame with respect to a singular point of the wearer's head, or to the relative position of a singular point of the reference frame relative to a set of points of the wearer's head, or to the relative position of two sets of points forming two local surfaces respectively belonging to the reference frame and to the wearer's head. It is then possible to search the parts of these sets of points for which there is overlap between the wearer's head and the reference frame. It is then a contact area between the head and the frame that should be removed if it does not correspond to the support areas located at the nose and ears of the wearer. Step e) (block 500 of FIG. 7) In step e), at least one value of at least one geometrical customization parameter PGMperso of said personalized frame is determined from the values of the determined geometrical-morphological reference parameter. in step d) and the reference geometrical parameter of said reference frame determined in step b). More specifically, the value of said customization geometrical parameter is determined so that the personalized mount is fitted to the wearer's head in accordance with at least one personalization adjustment criterion comprising a constraint on at least one geometrical-morphological parameter related to the relative position of said custom mount relative to the wearer's head. In other words, the geometrical parameter of customization is determined according to the values of the geometrical-morphological parameter measured in step d) for the reference mount positioned on the wearer's head, as a function of the reference geometrical parameter of said reference frame and so that the geometric-morphological parameter related to the relative position of said custom mount relative to the wearer's head satisfies a personalization adjustment criterion. It is for example to ensure that the personalized frame matches the morphology of the face as closely as possible, without coming into contact with the wearer's head outside the limited areas of support of the personalized frame. This is to minimize the distance between the custom mount and the wearer's head. It is also a question of ensuring that the shape of the personalized frame takes the form of elements of the face (eyebrows, cheekbones) or that the customized frame fits best on the face: adequate length of branch, shape of the nose in adequacy with the shape of the deck of the custom mount. This customization adjustment criterion includes a constraint on at least one of the following personalized geometric-morphological parameters. a relative position of the branches of the custom mount relative to the ears ORD, ORG of the wearer, a spacing of the branches of the personalized frame, defined according to a determined difference between the ears ORD, ORG, an optimization of the contact surface between the nasal support members of the personalized frame and the nose N of the wearer, - a relative position of the circles of the personalized frame and the eyes OD, OG of the wearer, - a relative position of the contour of the mounted ophthalmic lenses on the personalized frame and eyes OD, OG of the wearer, - a distance between at least one singular point of the personalized frame and a singular point of the wearer's head, - a distance between at least one singular point of the contour of the ophthalmic lenses mounted on the custom mount and a singular point of the wearer's head, - an angle between a straight line connecting the highlights of the cheekbone JS and the eyebrow arch re SCS and the average plane of the circle PMC of the personalized mount disposed opposite, measured in a plane perpendicular to said mean plane of the circle of the mount, - an angle between a straight line connecting the sphenoid point P1 and a point PN 25 of the wing of the wearer's nose and the average plane of the corresponding PMC circle of the frame, measured in a plane parallel to the plane of Frankfurt PF of the wearer's head. The distances and singular points considered here are for example chosen from those described for the determination of the geometric-morphological reference parameter of step d). The custom adjustment criterion may for example include target values for different geometric-morphological parameters customized according to standard values of adjustment of the frame. For example, a target value of the distance between the eyes and the circles of the frame, that is to say between the corneal vertices of the eyes and the average plane of each circle, is equal to 12 millimeters. It is also possible to set a target value of the gap between the circles 11, 12 of the frame 10 and the eyebrows SCD, SCG and / or the cheekbones J of the wearer equal to 3 millimeters, for example. Finally, it is possible to set a target value equal to 6 degrees for the AMV pantoscopic angle or equal to 8 degrees for the value of the curve angle GG, GD of the frame 10. The target values can also be determined according to the material of the frame: for example, for a satisfactory adjustment, it is possible to provide a target value of the difference between the branches of the personalized frame as a function of the upper ear difference, that is to say the difference between the grooves S of the right ORD and left ORG ears. For flexible branches, for example made of metal and thin, the target value of the gap between the branches is equal to the upper ear gap minus fifteen millimeters. For semi-rigid branches, for example made of metal and thick, the target value of the gap between the branches is equal to the upper ear gap minus ten millimeters.
[0027] For rigid branches, for example made of plastic and thin, the target value of the gap between the branches is equal to the upper ear gap minus five millimeters. For very rigid branches, for example made of plastic and thick, the target value of the gap between the branches is equal to the upper ear gap minus two or three millimeters. Target values can be replaced by target value ranges. It can also be maximum and / or minimum values. Other empirical criteria may also be taken into account, for example, requiring that the branch of the custom mount be in contact with the groove S of the ear ORG, ORD for a length of between 2 and 2.5 centimeters ( Figure 6) and that it is at a distance between 2 and 5 millimeters of the skull of the wearer. It is also possible that the shape of the spatula is adapted all along the groove of the ear. This adjustment allows better holding of the equipment, especially for wearers with a fairly flat nose, with a strong correction or significant dynamic activity. In addition, since the custom mount is intended to accommodate visual correction lenses, the value of said personalized frame customization geometrical parameter can also be determined according to the visual correction made by the lenses. For this purpose, the personalization adjustment criterion is determined according to the visual correction made by the lenses. More specifically, the curvatures of the front face and the rear face of the ophthalmic lens and its thickness can vary greatly.
[0028] This can induce particular constraints that can be taken into account in the personalization adjustment criteria. For example, knowing the shape of the circles of the custom mount and the visual correction associated with the ophthalmic lenses to be mounted in the mount, it is possible to determine an optimal curve angle or an interval of optimal curvature angles of the frame personalized for the reception of these ophthalmic lenses. It is also possible to determine an optimal curve angle or a base for the custom mount. The base of the mount is defined as the reciprocal of the radius of curvature of the mount's front. The curve or the base of the custom mount must be in line with the optical constraints on the achievement of ophthalmic lenses to be mounted in the custom mount so that these lenses provide a good quality optical function. It is verified, for example, that the curvature of the front face of each lens having the appropriate refraction is compatible with the curve angles or the base of the personalized frame. In some cases of use, it is difficult to reconcile the protective properties of the optical equipment, for example against the sun or dust and the prescription of the wearer, that is to say the visual correction made by the lenses mounted in the mount of this equipment. Indeed, non-personalized frames offering satisfactory protection are generally strongly curved. Consequently, for both technical and aesthetic reasons, the ophthalmic lenses intended to be mounted in such non-personalized frames must have a front face whose curvature is in agreement with the curvature of the frame. Ophthalmic lenses providing correction of a visual defect of the hyperopia type are therefore more suitable for mounting on the frames offering this type of protection than the ophthalmic lenses providing correction of a visual defect of the myopia type because the former have a face before more arched than the latter. In order to personalize all the optical equipment of the wearer, that is to say his mount and the associated ophthalmic lenses, it is possible to envisage the following steps in each of the embodiments described above. An ophthalmic lens adapted to the visual correction of the wearer and having a front face whose curvature is adapted to the chosen reference frame is firstly determined.
[0029] We then take into account the geometric data of the frame and ophthalmic wearer. The curve and the base of the personalized frame are determined according to the shape of the circles of the frame and the curvature of the front face of each ophthalmic lens, so as to satisfy a criterion for adjusting the distance between the frame and the lens. face. The adjustment criterion is related here to the distance between the extreme point of the circle of the customized frame on the temporal side located on a horizontal median line (boxing line) and the point of the wearer's head located opposite this extreme point, along a direction parallel to the direction 02Z2.
[0030] This geometric customization parameter is then determined, here, for example a new shape of the circles of the personalization frame and / or the curve of the frame, so that this distance is as close as possible to a target distance equal to example to 15 millimeters. For example, a value range is defined in which the distance is included. This interval is for example between 10 and 20 millimeters. The determination of this distance gives the curve angle when the position of the reference frame is fixed in front of the eyes. In practice, the custom mount is then determined by calculating a new shape of the circles and a new curve of the custom mount.
[0031] For this we jointly determine a new set of points and a new curve that will allow the custom mount to meet the adjustment criterion imposed. It is also possible to fix a minimum distance between the outer canthus of the eye of the wearer and the point of the circle of the corresponding personalized frame located at the junction with the corresponding branch. The geometrical parameter of personalization is then determined, for example the curve and / or the length of the branches according to these two personalization adjustment criteria.
[0032] The geometric customization parameter determined in step e) comprises at least one of the following parameters: the curve angle, the pantoscopic angle, the length of the branches, the width of the bridge, the height of the elements. nasal support, - the shape or one of the dimensions of the frame, for example the width or the height of the circles of the personalized frame, or the contour of the ophthalmic lenses in the case of a custom frame without a circle or semi-circle, this shape being characterized in particular by the value of the curve angles GG, GD associated with its contour, the positioning or the orientation of the bearing elements of the personalized frame on the nose N of the wearer, in particular pads when the frame custom includes, or sometimes the edge of the custom frame, in the case of a custom plastic mount without pads. The method according to the invention also relates to the design and / or manufacture of the spectacle frame customized for the wearer as a function of this personalized geometrical parameter determined as previously exposed. To do this, a geometric definition of said personalized frame is preferably determined according to said personal geometric parameter P pers ° and a frame shape chosen by the wearer (block 600 of FIG. 7).
[0033] By geometric definition of the custom mount, we mean a real or virtual definition of the custom mount. The actual geometrical definition of the custom mount may be the custom mount itself or a real modeling of this custom mount, made for example in the form of a prototype comprising only certain elements of the custom mount. The virtual geometrical definition of the personalized frame consists of a numerical modeling of this personalized frame, comprising for example a data file grouping the values of different geometrical characteristics of the personalized frame, for example the angle of curvature, the pantoscopic angle, the length of the branches, the width of the bridge, the height of the nose support elements, the shape or one of the dimensions of the frame, the positioning or the orientation of the bearing elements of the frame on the wearer's nose. The virtual geometric definition of the frame may also include any data file grouping the coordinates, in the same frame, of different singular points of the custom mount. Several possibilities are conceivable to design and / or manufacture the custom mount. A first possibility consists in starting from a pre-existing frame and deforming it, without adding material and remaining within the limits of elastic deformation of the materials, so as to obtain the desired personalized frame. Thus, the geometrical definition of said custom mount then comprises the following sub-steps: - an initial frame having the shape desired by the wearer is determined and a predefined initial geometrical definition of this initial frame is acquired; this initial geometric definition is deformed so that the geometric definition of the personalized frame, resulting from this deformation, conforms to said geometric parameter of personalization Pperso. This deformation may notably involve a deformation of the contour of the circles of the personalized frame or the contour of the ophthalmic lenses in the case of a pierced frame, for example so as to follow the shape of the eyebrows or cheekbones.
[0034] Said initial frame can obviously be the real or virtual reference frame chosen by the wearer in step a). However, if the wearer changes his mind or if it appears for example that the choice of the reference frame is not adapted to the shape of the wearer's head or to his visual correction for example, the initial frame selected may have a shape and characteristics of dimensions and / or material different from that of the reference frame. The acquisition of the initial geometrical definition of the initial mount corresponds for example to a measurement of a geometrical magnitude of the actual initial mount or to the determination by calculation of such a geometrical magnitude in the case of a virtual initial mount . For example, the curve angle of the initial frame is determined. Then, if the geometrical quantity measured or calculated, for example the curve angle, is not equal, in the definition of the initial frame, to the value of the corresponding custom geometric parameter, the geometrical definition of the frame is modified. initial manner so as to obtain, for the custom mount, the desired value of this geometric magnitude, for example the curve angle. These sub-steps can be performed virtually, by deforming by calculation the definition of the initial frame so as to obtain a model of the custom mount, that is to say a virtual custom mount, or actually, then directly deforming the initial frame, which then constitutes said geometric definition of the initial frame, so as to obtain a real custom mount.
[0035] In the first case, the necessary deformation or deformations of the initial frame are then determined so that the geometrical definition of the personalized frame complies with said geometrical parameter of personalization. The deformities evaluated in the previous step are physically applied to the initial frame to obtain the personalized frame. The deformations to be implemented are those which remain in a field close to the elastic domain of the material constituting the initial frame. Optionally, once the necessary deformations of the initial frame determined, is carried out a reference information on the adequacy between the ability to deform the initial frame and the necessary deformation thereof. In practice, the following deformations of the initial frame are envisaged in order to respect the determined geometrical parameters of personalization. To adjust the positioning of the circles in front of the eyes and / or to limit the contact areas between the circles of the personalized frame and the cheekbones J or the eyebrows SCD, SCG of the wearer, it is possible to modify the gap between this custom frame. The nose having a trapezoidal shape, the smaller the gap between the pads, the more the custom mount will be positioned high on the wearer's face. The wafer arms can also be adjusted to move the wafers away from or closer to the custom mount circles and thereby change the distance between the OD, OG eyes and the ophthalmic lenses that will be worn by the custom mount 10. To ensure horizontality from the custom mount and adjust the pantoscopic angle, we can change the inclination of the branches relative to the circles of the custom mount. This also makes it possible to adjust the contact between each branch and the groove S of the corresponding ORD ear ORG of the wearer. To ensure the horizontality of the custom mount on the wearer's head TS relative to the eyebrows or in relation to the eyes, it is necessary to tilt down the branch on the side of the lower circle or tilt up the branch on the side of the highest circle. Depending on the height of the ears ORD, ORG with respect to the eyes, the branches may be tilted downwards to increase the pantoscopic angle, which favors near vision of the wearer or inclining the limbs for to reduce the pantoscopic angle, which in particular makes it possible to limit the contact between the bottom of the circles of the frame and the cheekbones. The opening of the branches is initially symmetrical. However, if the front of the custom mount, which includes the circles and the bridge, is not parallel to the wearer's face, the parallelism can be adjusted by opening the branch on the side of the facade farthest from the wearer's face. . For custom frames with arm-mounted pads that are not integrated into the circles, you can also change the distance between the pads' contact surfaces and the circles of the custom mount, as well as the face angle and the hunting angel of each wafer. It is possible to provide deformation limit values that must not be exceeded, as this may damage the frame, which may depend on the material of the frame. The computer and electronic means can then be programmed to deduce from the necessary deformation of the determined frame, a difficulty level of the deformation of the initial frame to obtain the personalized frame. This level of difficulty is transmitted to the optician who can then advise the wearer to choose another initial mount if the deformation proves too difficult. An alert can be issued if deformation is impossible, for example if the required deformation exceeds the mechanical limits of the mount and may damage it. For example, it is not possible to adjust the spacing of the wafers on plastic mounts, because these mounts do not have any. Thus, advantageously, the computer and electronic means preferably perform an additional step of returning information on the adequacy between the ability to deform the frame and the necessary deformation of the initial frame determined. The modification of the initial frame can also take into account certain limitations or constraints induced by the visual correction of the ophthalmic lenses intended to be mounted in the personalized frame. For example, the thickness of the ophthalmic lens is taken into account. For example, a highly myopic ophthalmic lens will be made with a flat base front. The curve angle and / or the base of the contour of the custom frame must then be limited. Conversely, for hyperopic ophthalmic lenses that have significant curvature, the curvature angle of the custom mount may be larger. According to a second possibility, the geometric definition of said personalized mount includes access to a predefined frame register containing, associated with each predefined frame, an identifier of the shape of the predefined frame and at least one geometrical parameter of this predefined frame and searching in this register of at least one predefined mount whose shape corresponds to the initial mounting shape chosen by the wearer and whose geometry satisfies, with a predefined tolerance, the geometric parameter of said custom mount.
[0036] This definition of the custom mount is then also a virtual definition in the form of a model of the custom mount. The choice of the personalized frame is thus realized. The custom mount can then be ordered or manufactured by any means known to those skilled in the art, as explained below.
[0037] Finally, according to a third possibility, the geometric definition of the personalized frame comprises the assembly of geometric definitions of main parts of the frame, for example the branches, the nose support elements and the circles, each of these parts being respectively selected. by a search in a register containing different forms and / or dimensions of realization of the part concerned, of at least one shape and / or dimension of this part corresponding to the frame shape chosen by the wearer and whose geometry satisfies, with a predefined margin of tolerance, to the geometrical parameter of personalization. This definition of the custom mount is then also a virtual definition in the form of a model of the custom mount. According to this third possibility, a choice or a selection of the constituent parts of the personalized frame is made. The physical assembly of these pieces results in the manufacture of the custom mount. For this purpose, we select, in a set of predefined parts, those to build the custom mount. Each of these component parts is available in stock for a limited number of sizes. It can be different lengths of branches. It may also be forms of front face mounting more or less rounded or more or less curved.
[0038] A fourth possibility relates to the case of a custom mount having no circles, for example a pierced mount, in which the shape of the contours of the ophthalmic lenses directly defines the geometry of the frame. In this case, in order to produce the personalized optical equipment comprising such a frame, the ophthalmic lenses having the visual correction conforming to the wearer's prescription, an outline having the desired shape, and a base conforming to the base of the personalized frame are manufactured. . The angle of curvature and the pantoscopic angle of the personalized frame can then be adjusted by producing on the ophthalmic lenses machining for orienting the branches and / or the bridge with respect to the lenses. For example, in the case of a pierced mount, the drilling angles of the fixing holes of the branches and / or the bridge are oriented so that the attachment of the branches and / or the bridge on the lenses reproduces the values desired curvature angles and / or pantoscopic angle. Whatever the possibility used to determine the geometric definition of the custom mount, after determining it, we deduce a geometric-morphological parameter related to the relative position of said custom mount relative to the wearer's head. It is then possible to carry out a step of verifying the conformity of this geomorphologic parameter with a predetermined target value or range of target values. In practice, for this purpose, the computer and electronic means can perform a simulation of the positioning of the personalized frame obtained on the wearer's head and an additional step of returning information indicating a final relative position of the customized frame on the head of the carrier. In the case where the geometric definition of the custom mount is real, it is possible to perform a fitting and measurements such as that described in the realization of step d) for the reference frame. This is also done for control purposes and can be used to determine a final expected relative position of the custom mount on the wearer's head. The actual geometric definition of the custom mount may possibly be a prototype of the mount. This information is transmitted to the operator and can be a decision aid in the choice of the eyeglass frame. In general, steps d) and e) are performed on separate sites. In particular, step d) is performed on a site located in any location accessible either physically by the wearer, or on the internet or on a server, while step e) is performed on a site located at an optician or in a glasses fitting laboratory.

权利要求:
Claims (15)
[0001]
REVENDICATIONS1. A method of determining a value of at least one geometrical parameter of personalization of a personalized eyeglass frame adapted to the wearer's head, comprising the following steps: a) identifying (100) a reference frame, b) determining (200) the value of at least one reference geometric parameter Pref on said reference mount, c) placing (300) in the use position said reference mount on the wearer's head, d) in the configuration of step c), determining (400) the value of at least one geometric-morphological reference parameter PGM, -ef related to the relative position of said reference frame relative to the wearer's head, e) from values of the reference geometrical-morphological parameter PGMref determined in step d) and of the reference geometrical parameter Pref determined in step b), determining (500) at least one value of at least one geomatic parameter Customization stick P pers ° of said personalized frame. 20
[0002]
2. Method according to the preceding claim, wherein, in step e), the value of said personal geometry parameter Pperso is determined so that the custom mount is adjusted to the wearer's head in accordance with at least one criterion of personalization fitting comprising a constraint on at least one personal-morphological parameter of personalization PGM -pers ° related to the relative position of said custom mount relative to the wearer's head.
[0003]
3. Method according to the preceding claim, wherein said customization adjustment criterion comprises a constraint on at least one of the following PGMp'so geometrical-morphological parameters of personalization: a relative position of the branches of the personalized frame by relative to the ears (ORD, ORG) of the wearer, - a spacing of the branches of the personalized frame, defined according to a determined gap between the ears (ORD, ORG) of the wearer, - an optimization of the contact surface between the appuinasal elements of the personalized frame and the nose (N) of the wearer, - a relative position of the circles of the personalized frame and eyes (OD, OG) of the wearer, - a relative position of the contour of the ophthalmic lenses mounted on the personal frame and eyes (OD, OG) of the wearer, - a distance between at least one singular point of the personalized frame and a singular point of the wearer's head, - a distance between at least one singular point of the ophthalmic lenses mounted on the custom mount and a singular point of the wearer's head, - an angle between a straight line connecting the highlights of the cheekbone (JS) and the brow bone (SCS) and the average plane of the circle (PMC) of the customized mount disposed opposite, measured in a plane perpendicular to said mean plane of the rim of the frame, - an angle between a straight line connecting the sphenoid point (P1) and a point (PN) of the nose wing of the wearer and the corresponding average plane of the circle (PMC) of the frame, measured in a plane parallel to the plane of Frankfurt (PF) of the wearer's head.
[0004]
4. Method according to one of claims 2 and 3, wherein, the custom mount being intended to accommodate visual correction lenses, in step e), the value of said geometrical parameter personal custom mount Per r is determined according the visual correction of the lenses made by these lenses.
[0005]
5. Method according to one of the preceding claims, according to which, in step e), the determined personal geometry parameter P - pers ° comprises at least one of the following sizes relating to the personalized frame: the angle curvature, the pantoscopic angle, the length of the branches, the width of the bridge, the height of the nose support elements, the shape or one of the dimensions of the frame, the positioning or the orientation of the support elements 30 of the mount on the wearer's nose.
[0006]
6. Method according to one of the preceding claims, wherein, in step d), the measurement of the reference geometrical-morphological parameter PGMref comprises the capture of at least one image of the wearer's head equipped with the frame of reference.
[0007]
7. Method according to one of the preceding claims, according to which, in step d), said at least one geometric-morphological reference parameter PGM, -ef comprises at least one of the following geometrical quantities: a relative position branches (14, 15) of the reference frame (10) relative to the ears (ORD, ORG) of the wearer, - a spacing of the legs (14, 15) of the reference frame (10) associated with a determined difference between the ears (ORD, ORG) of the wearer, - an evaluation of the contact area between the nose support elements (16A) of the reference frame (10) and the nose (N) of the wearer, - a relative position circles (11, 12) of the reference frame and eyes (OD, OG) of the wearer, - a relative position of the contour of the ophthalmic lenses mounted on the reference frame and the eyes (OD, OG) of the wearer, - a distance between at least one singular point of the reference frame and a singular point of the a head of the wearer, - a distance between at least one singular point of the contour of the ophthalmic lenses mounted on the reference frame and a singular point of the wearer's head - an angle between a straight line connecting the highlights of the cheekbone (JS) and the eyebrow arch (SCS) and the average plane of the circle (PMC) of the reference frame disposed opposite, measured in a plane perpendicular to said mean plane of the frame of the frame, - an angle between a straight line connecting the point sphenoid (P1) and a point (PN) of the nose wing of the wearer and the corresponding average plane of the circle (PMC) of the frame, measured in a plane parallel to the Frankfurt plane (PF) of the wearer's head.
[0008]
8. Method according to one of the preceding claims, wherein in step c), the use position is such that the reference frame is fitted to the wearer's head in accordance with at least one adjustment criterion of reference.
[0009]
9. Method according to the preceding claim, wherein said reference adjustment criterion comprises a constraint on at least one of the following geometric quantities: a relative position of the branches of the reference frame relative to the ears (ORD, ORG) ) of the carrier, - a spacing of the legs (14, 15) of the reference frame, defined according to a determined difference between the ears (ORD, ORG) of the wearer, - an optimization of the contact surface between the elements nasal support (16A) of the reference frame and the nose (N) of the wearer, - a relative position of the circles (11, 12) of the reference frame and the eyes (OD, OG) of the wearer, - a relative position of the contour of the ophthalmic lenses mounted on the reference frame and the eyes (OD, OG) of the wearer, - a distance between at least one singular point of the reference frame and a singular point of the wearer's head, - a distance between at least one point singular contour of the ophthalmic lenses mounted on the reference frame and a singular point of the wearer's head, - an angle between a line connecting the highlights of the cheekbone (JS) and the brow bone (SCS) and the plane mean of the circle (PMC) of the reference frame arranged opposite, measured in a plane perpendicular to said mean plane of the circle of the mount, - an angle between a line connecting the sphenoid point (P1) and a point (PN) of the wing of the wearer's nose and the corresponding mean plane of the circle (PMC) of the frame, measured in a plane parallel to the plane of Frankfurt (PF) of the wearer's head.
[0010]
10. Method according to one of the preceding claims, wherein, in step c), for placing in the use position a reference frame on the head of the wearer, real placement of the reference frame is made on the the wearer's actual head.
[0011]
11. Method according to one of claims 1 to 9, wherein, in step c), for placing in the use position the reference frame on the wearer's head, the following sub-steps are carried out: at least partial numerical modeling of the wearer's head (TS), with, in a first common reference frame, at least one model (MN) of a part of the nose (N), a model (MORD, MORG) of a part of the ears (ORD, ORG), - perform a simulation of the positioning of the reference frame on the head (TS) of the wearer, by superimposing by a numerical calculation, on the modeling of the head (TS) of the wearer, the zones corresponding numerical modeling of said reference frame.
[0012]
12. The method of claim 11, wherein step c) further comprises the following sub-step: determining the modeling of the reference frame with a second common frame of reference, at least one model of a portion of the bridge (13) of the reference mount and a model of a portion of the legs (14, 15) of the reference mount (10), the simulation of the positioning of the reference mount on the head (TS) of the carrier being performed by superimposing, on the one hand, the model of a portion of the bridge of the reference frame and the model (MN) of a portion of the nose of the wearer, and, on the other hand, the model of part of the branches of the reference frame and the model (MORD, MORG) of part of the wearer's ears.
[0013]
13. A method of determining a custom mount, according to which a value of at least one geometrical parameter of customization of said personalized frame according to one of claims 1 to 12 is determined, and a geometrical definition of said personalized frame is determined. according to said geometric personalization parameter and a frame shape chosen by the wearer, the geometrical definition of said personalized frame comprising the following sub-steps: - an initial frame having the shape desired by the wearer is determined and a pre-defined initial geometrical definition of this initial mount; this initial geometric definition is deformed so that the geometrical definition of the personalized frame, resulting from this deformation, conforms to said geometrical parameter of personalization.
[0014]
14. A method of determining a custom mount, according to which a value of at least one geometrical parameter of customization of said personalized frame according to one of claims 1 to 12 is determined, and a geometrical definition of said personalized frame is determined. according to said personalization geometrical parameter and a frame shape chosen by the wearer, the geometric definition of said personalized frame including access to a frame register containing, associated with each frame, an identifier of the frame shape and at least one geometrical parameter of this frame and the search in this register of at least one mount whose shape corresponds to the mounting shape chosen by the wearer and whose geometry satisfies, with a predefined tolerance, the geometrical parameter of said custom mount.
[0015]
15. Method according to one of claims 13 and 14, wherein the geometric definition of the personalized frame comprises the assembly of geometric definitions of at least two main parts of the frame among the branches, the nose support elements and the circles, each of these main assembled parts being respectively selected by a search in a register containing different forms and / or dimensions of realization of the part concerned, of at least one form and / or dimension of this part corresponding to the form of frame chosen by the wearer and whose geometry satisfies, with a predefined margin of tolerance, the geometrical parameter of personalization.

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同族专利:

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WO2015101737A1|2015-07-09|

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EP3420887A1|2017-06-30|2019-01-02|Essilor International|Method for determining the position of the eye rotation center of the eye of a subject, and associated device|

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法律状态:
2016-01-26| PLFP| Fee payment|Year of fee payment: 3 |

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2017-01-25| PLFP| Fee payment|Year of fee payment: 4 |

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2018-01-25| PLFP| Fee payment|Year of fee payment: 5 |

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2018-07-06| TP| Transmission of property|Owner name: ESSILOR INTERNATIONAL, FR Effective date: 20180601 |

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2020-01-27| PLFP| Fee payment|Year of fee payment: 7 |

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2021-01-25| PLFP| Fee payment|Year of fee payment: 8 |

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2022-01-25| PLFP| Fee payment|Year of fee payment: 9 |

优先权:

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申请号 | 申请日 | 专利标题

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FR1450018A|FR3016051B1|2014-01-02|2014-01-02|METHOD FOR DETERMINING AT LEAST ONE GEOMETRIC PARAMETER OF A PERSONALIZED FRAME OF EYEWEAR AND METHOD OF DETERMINING THE ASSOCIATED CUSTOM FRAME|FR1450018A| FR3016051B1|2014-01-02|2014-01-02|METHOD FOR DETERMINING AT LEAST ONE GEOMETRIC PARAMETER OF A PERSONALIZED FRAME OF EYEWEAR AND METHOD OF DETERMINING THE ASSOCIATED CUSTOM FRAME|

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PCT/FR2014/053504| WO2015101737A1|2014-01-02|2014-12-22|Method for determining at least one geometric parameter of a customized glasses frame, and related method for determining the customized frame|