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    • 专利摘要:
    The light module (1) for a motor vehicle has a light source (2) associated with a first portion (IP1) of an imaging system (IMS) to produce a reflected beam coinciding with the reflection surface of a modulator high-resolution pixelated spatial system (3), which makes it possible in particular to avoid unnecessarily illuminating the periphery of the spatial modulator. The light source (2) essentially consists of one or more light-emitting diodes and / or has a point or quasi-point appearance. The reflected radiation (R2) arrives at a second portion (IP2) of the imaging system, which typically consists of projection optics (18) some of whose elements may form a backfocusing system. The module (1) remains compact and is well adapted to achieve an adaptive lighting in a homogeneous, efficient and with a high resolution.
    公开号:FR3065784A1
    申请号:FR1753756
    申请日:2017-04-28
    公开日:2018-11-02
    发明作者:Pierre Albou
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    © Publication no .: 3,065,784 (to be used only for reproduction orders)
    ©) National registration number: 17 53756 ® FRENCH REPUBLIC
    NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY
    COURBEVOIE © Int Cl 8 : F21 V13 / 04 (2017.01), F21 S 41/25
    A1 PATENT APPLICATION
    ©) Date of filing: 28.04.17. (© Applicant (s): VALEO VISION Joint-stock company (© Priority: simplified - FR. @ Inventor (s): ALBOU PIERRE. ©) Date of public availability of the request: 02.11.18 Bulletin 18/44. ©) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents Holder (s): VALEO VISION Joint stock company related: folded. ©) Extension request (s): (© Agent (s): VALEO VISION Limited company.
    SPATIAL MODULATOR
    LIGHT MODULE WITH OPTIMIZED IMAGING OPTICS FOR A PIXELLISE, FOR A MOTOR VEHICLE.
    FR 3 065 784 - A1
    The light module (1) for a motor vehicle has a light source (2) associated with a first part (IP1) of an imaging system (IMS) in order to produce a reflected beam coinciding with the reflection surface of a modulator. high definition pixelated spatial (3), which in particular makes it possible to avoid unnecessarily lighting the periphery of the spatial modulator. The light source (2) essentially consists of one or more light-emitting diodes and / or has a point or almost point appearance. The reflected radiation (R2) arrives on a second part (IP2) of the imaging system, which typically consists of a projection optic (18), certain elements of which can form a back-focusing system. The module (1) remains compact and is well suited to achieve adaptive lighting in a homogeneous, efficient and high resolution.

    i
    Light module with optimized imaging optics for a pixelated space modulator, intended for a motor vehicle
    The present invention relates to lighting for vehicles, in particular towards the front or towards the rear. The invention relates more precisely, in the automotive field, a light module provided with a pixelated spatial modulator, for example in the form of a micro-mirror matrix (or DMD from the English “Digital Micromirror Device”) whose micro-mirrors are controllable.
    A lighting device for a motor vehicle is known, comprising a light source, a matrix of micro-mirrors or similar modulating device making it possible to decompose a light beam into pixels distributed in two dimensions. The matrix of micro-mirrors is generally used to reflect the light rays coming from the light source towards an optic for shaping the light beam, intended to project the figure formed on the matrix of micro-mirrors, in the form of an outgoing light beam. This light beam makes it possible for example to illuminate the lane on which the motor vehicle comprising this lighting device circulates, or fulfills a signaling function.
    Projection lighting using a micro-mirror array or similar pixelated spatial modulator offers the possibility of providing bright and adaptive lighting solutions for many applications. We can cite the function consisting in forming an adaptive beam, in order to illuminate the road at the relevant place, if necessary so as not to dazzle in the turns the oncoming vehicles, which is generally designated by the acronym DBL (Dynamic Bending Light). In a manner known per se, the matrix grouping the micro-mirror devices decomposes the outgoing beam into pixels, which allows the projected light beam formed with a micro-mirror matrix to be shaped adaptively to suit a variety of needs. The control circuit can advantageously be used to segment and / or adaptively shape the projected light beam, for example so as to avoid the eyes of oncoming drivers. Sensors and control circuits can be used to automate this function without glare.
    By forming an adaptive beam, some of the micro-mirrors in a DMD matrix can be in an inactive position (due to a certain tilt) while other mirrors are oriented in the on position and reflect the light towards the system. imagery, for example a projection lens. In this way, it is possible to shape the beam of light projected by the lens. However, the light radiation directed towards the micromirrors of the DMD matrix is only very partially used and it is generally considered that the use of a micro-mirror matrix is not energy efficient.
    There is therefore a need to efficiently use illumination sources with a DMD matrix, even when the illumination sources are of a simple / inexpensive type such as light emitting diodes (LEDs) or the like.
    In order to improve the situation, the invention proposes a light module for a motor vehicle, intended to shape a light beam, the light module comprising:
    - a light source,
    - an imaging system adapted to create an image of the light source,
    - a high definition pixelated spatial modulator, presenting a reflection zone having a determined format, the imaging system comprising at least two optical elements distributed upstream and downstream of the spatial modulator following the direction of propagation of the light emitted by the light source, so that there is at least one optical element of the upstream imaging system and at least one optical element of the downstream imaging system of the high definition pixelated spatial modulator, the imaging system comprising , in a first imaging part, an adjustment lens to a dimension characteristic of the determined format, suitable for concentrating radiation from the light source (the adjustment effect is for example such as the raw radiation from the source light is converted, after passing through the lens, into a first radiation which is within the limits of the perimeter of the reflection zone of the modulator s patial when it reaches it).
    The imaging system is thus designed to format an intermediate image on the one hand (on the upstream side of the spatial modulator), and to format the image to be projected on the other hand (on the downstream side of the spatial modulator) .
    Usually for this type of light module, it is understood that the image created at the output of the imaging system, also called the output image, is the image that will be perceived outside the module. The outgoing beam simply propagates this output image, without additional optical processing outside the light module
    A spectacular increase in optical efficiency can be obtained by shaping upstream the high definition pixelated spatial modulator. It is allowed to remove a collimator since it is a question of lighting by forming an intermediate image. The flow efficiency is improved by the concentration of the beam emitted from the light source with optionally anamorphic compression of the illumination beam routed on the reflection zone or active zone of the high definition pixelated spatial modulator. This makes it possible to adjust the intermediate image of the source formed on the reflection zone, as close as possible to the external dimensions of this zone. In practice, the external rays of the beam on the upstream side can then be incident along the perimeter of the reflection zone, without exceeding the outside of this perimeter.
    According to one particular feature, the high definition pixelated spatial modulator is defined by a matrix of micro-mirrors having a reflection zone whose largest dimension is greater than the largest dimension of the light source.
    In the case of a significantly elongated reflection zone, for example with a length of approximately double the width, the part of the imaging system upstream of the spatial modulator can perform an anamorphosis. More generally, a technical advantage of this type of solution, with possibly anamorphic compression of the image of the light source in one direction, is that it is allowed to make the intermediate image coincide with the structure of the spatial modulator while allowing this same image to be enlarged to fill the input diopter of the projection optics, on the downstream side of the spatial modulator.
    In addition, the output image can be very homogeneous. In addition, it is possible to avoid unnecessary heating of the periphery of the reflection zone, which is generally sensitive to heat.
    An optical module according to the invention may include one or more of the following characteristics:
    - the reflection zone of the high definition pixelated spatial modulator has a rectangular format and is delimited by a rectangular perimeter.
    - the light module includes projection optics including several lenses and which can correspond to a second imaging part of the imaging system.
    - the lens also allows adjustment to the shape of the reflection zone.
    - at least one of the optical elements of the imaging system, defining the first imaging part, comprises an adjustment lens in the determined format, this adjustment lens being designed and arranged to concentrate the radiation from the light source by defining a contour shape of the radiation which corresponds to the shape of a perimeter of the reflection zone defined by the spatial modulator.
    - The first part of imagery, arranged upstream of the spatial modulator following the direction of propagation of the light emitted by the light source, has at least one transparent optical element with anamorphic effect; thus it is allowed for example to compress typically the vertical component and / or the horizontal component of the beam directed towards the spatial modulator, in order to make this beam coincide exactly with the dimensions of the reflection zone of the spatial modulator.
    - the first part of the imagery, arranged upstream of the spatial modulator, presents a mirror with anamorphic effect.
    - the high definition pixelated spatial modulator comprises a matrix of micromirrors, the micro-mirrors of the matrix of micro-mirrors being each movable between:
    a first position in which the micro-mirror is arranged to reflect light rays of a first radiation reaching it from the first imaging part of the imaging system, in the direction of a projection optic including or defining a second part of the imaging system,
    - And a second position in which the micro-mirror is arranged to reflect the light rays of the first radiation reaching it from the first imaging part of the imaging system, away from the projection optics.
    - the high definition pixelated spatial modulator comprises a reflective display zone of the liquid crystal on silicon type.
    - the high definition pixelated spatial modulator comprises a matrix of micromirrors distributed in a plane, the matrix defining an optical axis typically perpendicular to this plane and which passes centrally through the projection optics.
    - at least during the performance of a photometric function of the module, active micro-mirrors of the micro-mirror matrix are in an active state pivoted by a determined angle, preferably between 6 and 15 °, towards an optical element convergent type located upstream of the spatial modulator and which belongs to the imaging system. This orientation thus typically brings these mirrors normal to the source and / or the illumination lens.
    - the light source and the convergent type optical element are:
    - preferably offset laterally, on the same side, with respect to the micro-mirrors of the micro-mirror matrix, and
    - associated so that the light ray which travels the most distance between the convergent type optical element and a micro-mirror in an active state on the one hand, and the light ray which travels the least distance between l optical element of the convergent type and a micro-mirror on the other hand, are reflected so as to enter the projection optics passing through the edges of the first lens (convergent), possibly substantially perpendicular to the matrix of micro-mirrors. The expression substantially perpendicular is interpreted here as strictly perpendicular or with an offset less than or equal to 3 ° relative to the direction strictly perpendicular.
    - a convergent type optical element, located upstream of the spatial modulator and which belongs to the imaging system defines, from the light emitted by the light source, a first radiation projected on a reflection zone of the spatial modulator by forming on this reflection zone an intermediate image which is deformed by said optical element of the convergent type.
    the convergent type optical element extends in a position (for example less than 3 or 5 mm) adjacent to another optical element on which a second radiation is directed directly coming from a reflection of the first radiation on the modulator spatial, the other optical element preferably forming a first optical element of a projection optic belonging to the imaging system. More generally, in order to optimize the optical efficiency of the system, provision may be made for this element to be adjacent or close to the envelope of the light rays upstream of the modulator.
    the convergent type optical element extends comparatively further from the high definition pixelated spatial modulator and closer to the other optical element on which the second radiation is directly directed from a reflection of the first radiation on the spatial modulator .- certain elements of the projection optics form a back-focusing system.
    - the projection optics comprises, successively in this order, in a direction of distance relative to the spatial modulator:
    - the first optical element arranged as an input lens of the projection optics in order to capture the second radiation (the shape and the dimensions of this input lens typically making it possible to capture in its entirety this second radiation directed so general towards an exit face of the light module);
    - a pair of optical elements, possibly in the form of two optical lenses, making it possible to make the focal length of the projection optic less than the draw of said optic (in other words, the focal distance is reduced compared to a greater focal length which would be obtained for projection optics in the absence of this pair of optical elements).
    - the input lens of the projection optic consists of a biconvex lens, preferably a spherical biconvex lens.
    - the projection optics also includes an achromatic doublet.
    - the achromatic doublet can form one of the optical elements of the pair of optical elements.
    - the projection optic also comprises a thinner crown glass than the other lenses of the projection optics and placed between two final lenses of the projection optics.
    the light source essentially comprises or consists of one or more light-emitting diodes.
    - the group of light-emitting diodes defining the light source is mounted on a common support. When several sources are used, each one can possibly have its own optic upstream of the matrix. The solution with back-focusing and typically with an achromatic doublet makes it possible to obtain a compact module, for uniformly illuminating over a wide field, while optimizing the energy efficiency thanks to the shaping part provided upstream of the spatial modulator. high definition pixelated.
    According to another particular feature, the light source is part of a light emission unit provided with at least one reflecting surface distinct from the spatial modulator and making it possible to orient the light source in a direction away from the light by relative to a reflection zone of the spatial modulator (in this case, it is understood that the emission axis of the source is not more or less directed towards the matrix).
    According to a particular feature, a projection screen is provided in the light module, for example parallel to a reflection zone of the spatial modulator. The term "parallel" can be interpreted here with a certain tolerance, typically plus or minus 1 to 5 °. A second part of the imaging system can be adapted to create the desired image on the projection screen, from an intermediate image of the light source formed on the reflection area. The intermediate image is itself obtained by using a first part of the imaging system and extends exclusively inside a perimeter of the reflection zone, so as not to unnecessarily heat the periphery of this area of reflection.
    Another object of the invention is to provide a headlamp for a motor vehicle, comprising a headlamp housing and at least one optical module according to the invention in order to perform a lighting and / or signaling function.
    It is understood that this type of projector can advantageously have homogeneous lighting from a source, for example a light source with one or more light-emitting diodes, by targeting in an adjusted manner the active reflection surface of the DMD without overflowing, without optics of collimation.
    In the case of several diodes, these can be grouped on a common support or optionally distributed over several supports.
    Energy efficiency is greatly improved by the use of wide aperture imaging optics.
    Other characteristics and advantages of the invention will appear during the following description of several of its embodiments, given by way of nonlimiting examples, with reference to the attached drawings in which:
    - Figure 1 schematically shows an example of a lighting projector for a motor vehicle comprising a light module according to a first embodiment;
    - Figure 2 shows schematically in section a detail of a matrix of micro-mirrors forming the pixelated spatial modulator in high definition, used in the optical module of Figure 1;
    - Figure 3 schematically illustrates the path of light on either side of the high definition pixelated spatial modulator.
    - Figure 4 shows an alternative embodiment for concentrating the radiation from the light source on the reflection zone of the spatial modulator, with an anamorphic effect.
    In the different figures, the same references designate identical or similar elements. Certain elements may have been enlarged on the drawings, in order to facilitate understanding.
    FIG. 1 represents a first embodiment of an optical module 1 for a motor vehicle, which can be integrated, for example, into a front light or a rear light. The optical module 1 forms a light emission device configured to implement one or more photometric functions.
    The optical module 1 comprises, as illustrated, a light source 2, a matrix of micro-mirrors 6 (or DMD, for English “Digital Micromirror Device”), a control unit 16, for example in the form of a controller, making it possible to control micro-mirrors 12 of the matrix of micro-mirrors 6 and a projection optics 18 (or shaping optics) which belongs to an IMS imaging system. The control unit 16 can be optionally relocated, for example to allow the control of several optical modules
    1.
    The micro-mirrors 12 are distributed in a plane, so that the matrix 6 defines an optical axis A which substantially coincides with a central axis of the projection optics 18. As clearly visible in FIG. 1 in particular, the projection optics 18 is provided here between the reflection zone of the matrix of micro-mirrors 6 and a projection screen E1.
    Although the drawings show a matrix of micro-mirrors 6, it is understood that the light rays emitted by the light source 2 can be directed, by means of suitable optics, to any type of high-definition pixelated spatial modulator 3, which breaks down the received radiation R1 into pixels. In an alternative embodiment, a pixel matrix provided with active surfaces in the focal plane of the projection optics in the form of pixels, of “LCoS” type (from the English “Liquid Crystal on Silicon”), can be used. An LCoS matrix device may indeed be suitable. More generally, it is understood that a first radiation R1 can be received on a surface subdivided in a very fine way to define pixels with a high definition, with typically 1280 by 720 pixels or even more, knowing that a lower resolution would also be acceptable in many cases, in particular 640 by 480, and whose configurations can be modulated. The change of state is preferably allowed for each pixel, in a manner known per se.
    The light source 2 can consist of a light-emitting element such as a light-emitting diode (or LED) or an LED array. In the case of a group of electroluminescent elements, these are preferably tightened in the same zone comparable to a single source of lighting. A laser diode, if necessary coupled with a collimator system and possibly a wavelength conversion device, can also make it possible to form a raw radiation R0.
    With reference to FIG. 1, the light source 2 here makes it possible to form the raw radiation R0. This raw radiation R0 is oriented, directly or indirectly, towards a first part IP1 of the IMS imaging system. This first part IP1 can be defined by a lens 4 designed and arranged in order to define a modified image of the light source 2. The lens 4 can be of useful perimeter greater than or equal to the perimeter P6 of the reflection zone of the microphone matrix -mirrors 6 or reflection zone of a high definition spatial modulator 3 equivalent to this kind of matrix. More particularly, the lens 4 is typically an optic operating at maximum aperture, for which some aberrations do not pose a problem, which results here in a large diameter.
    Here, in the micro-mirror array 6, each of the micro-mirrors 12 can be moved between:
    ίο
    - the first position in which the micro-mirror 12 reflects incident light rays of radiation R1 in the direction of the projection optics 18,
    - And the second position in which the micro-mirror 12 transmits by reflection the incident light rays of the radiation R1 away from the projection optics 18, for example towards a device 19 for absorbing radiation which has an absorbent surface from light.
    As can be seen in FIG. 2, the matrix of micro-mirrors 6 can optionally be covered with a layer CP of protection of micro-mirrors 12 which is transparent. The pivot axis of each of the micro-mirrors 12 can allow, by way of nonlimiting example, a rotation of plus or minus 10 ° or plus or minus 12 ° relative to a nominal position without rotation.
    The radiation R1 obtained at the exit of the lens 4 is convergent towards a virtual point located further than the matrix of micro-mirrors 6. The radiation R2, resulting from the reflection on this matrix 6 can be focused at infinity or towards a point external to module 1 and distant. The energy of the R2 radiation can be entirely received by the projection optics 18, forming the second part IP2 of the IMS imaging system.
    With reference to FIGS. 2 and 3, in order to obtain such a parallelism of the reflected beam intended for the projection optics 18, provision is made for the active micromirrors 12 to be oriented in a comparable or identical manner. The first part IP1 of the IMS imaging system is dimensioned and designed / assembled in the light module 1, so that the general plane of the reflection zone is inclined relative to the optical axis Z (FIG. 3) of the lighting system. In the case of FIG. 3, the lens 4 defines the output of an illumination system for illuminating the matrix of micro-mirrors 6. More particularly, the optical axis Z shown in FIG. 3 and the plane of the zone of reflection are inclined between them by an angle which is for example double the angle of rotation has mobile micro-mirrors 12 (for example 2x12 ° = 24 °), which makes it possible to place the center of the zone of reflection on the optical axis A of the objective or projection optics 18 and ensuring that the main ray of the lighting system is reflected along this optical axis A. Optionally, the array of micro-mirrors 6 can be tilted further to prevent the projection optics 18 from creating a dim light in the lighting beam resulting from the reflection by the matrix of micro3065784 mirrors 6.
    In the examples of FIGS. 1 and 3, with respect to the micro-mirrors 12 of the micro-mirror array 6, the light source 2 and the lens 4 can be entirely offset laterally, so as not to interfere with the radiation R2 which is reflected from the reflection zone of the micro-mirror array 6.
    In order to optimize the optical efficiency of the system, provision may be made for the lens 4 and another optical element 21 to be adjacent or close to each other, and / or positioned in such a way that the optical element 21 and the envelope of the light rays upstream of the modulator 3 is as close as possible to one another. In the illustrated and nonlimiting example, the lens 4 can extend in a close position, less than 5 mm for example, such that the lens 4 is adjacent to this other optical element 21 on which the second radiation R2 is directed. directly resulting from the reflection on the matrix of micro-mirrors 6. A vertical virtual axis can for example both cross or be tangent to the respective input surfaces of the first part IP1 and of the second part IP2. More generally, the lens 4 can be arranged close to the optical element 21, typically by being closer to this optical element 21 than to the matrix of micro-mirrors 6.
    With reference to FIG. 4, the first part IP1 can alternatively be formed by an anamorphic lighting system. In this example, the light source 2 can form a surface of 1.7 × 1.7 mm 2 , while the reflection zone of the matrix of micro-mirrors 6 (of DMD type) extends in a rectangular fashion over a more large (for example 12x6 mm 2 ). Without being limiting, it may be preferable for the light source 2, which is typically formed by an array of diodes, to have a compact appearance, without exceeding for example 9 or 10 mm 2 , preferably without exceeding 3 or 4 mm 2 , or possibly almost punctual, with an emission surface of about 0.1 mm 2 .
    Here, the anamorphic system illuminates the matrix of micro-mirrors 6 by the use of two crossed cylindrical lenses 41, 42 having aspheric entry faces of revolution, typically for a (partial) correction of aberrations. The lens 41 closest to the light source 2 has its power in the direction of the greatest magnification, here horizontally when the horizontal dimension of the reflection zone is greater than its vertical dimension. It is understood that the anamorphosis makes it possible to uniformly illuminate the reflection surface and advantageously allows options with a large aperture of the IMS imaging system.
    Depending on requirements, provision may be made to increase the aperture (here around 0.32 compared to 0.53 in the embodiment of FIG. 3, optimized by the design and position of the lens 4).
    In an alternative embodiment, the first imaging part IP1 arranged upstream of the spatial modulator 3 has a mirror with anamorphic effect, for example a mirror with a concave reflection surface. In this type of case, the light source 2 may optionally be part of a light emission unit 20 provided with at least one reflecting surface (not shown) distinct from the high definition pixelated spatial modulator 3. The reflecting surface is of a type known per se, so it will not be detailed here; it can be used to orient the light source 2 in a direction away from the light with respect to a reflection zone of the high definition pixelated spatial modulator 3.
    More generally, it is understood that the first part IP1 can have at least one optical element (4; 41, 42), located upstream of the spatial modulator 3 and which belongs to the IMS imaging system, in order to define, from the light R0 emitted by the light source 2, the first radiation R1 projected on the reflection zone of the spatial modulator 3. Typically, an intermediate image is formed on this reflection zone which is deformed by an optical element of the convergent type, here in the form of lens 4 or an anamorphic system.
    The projection optics 18 of the second part IP2 allows the radiation R2 to be shaped complementary to the shaping produced by the first part IP1. This shaping by the projection optics 18 makes it possible to form an outgoing beam 40 which has a photometric function suitable for a vehicle, in particular a motor vehicle.
    A preferred photometric function associated with the optical module 1 is a lighting and / or signaling function visible to a human eye. These photometric functions can be the subject of one or more regulations establishing requirements for colorimetry, intensity, spatial distribution according to a so-called photometric grid, or even ranges of visibility of the light emitted.
    The optical module 1 is for example a lighting device constituting a headlight 10 - or headlight - of a vehicle. It is then configured to implement one or more photometric functions, for example chosen from a low beam function called "code function", a high beam function called "road function", an anti-fog function.
    Alternatively or in parallel, the optical module 1 is a signaling device intended to be arranged at the front or at the rear of the motor vehicle.
    The headlight 10 for a motor vehicle illustrated in FIG. 1 can be housed in a box 14 or be delimited by this box 14. The box 14, as illustrated, comprises a body 14a forming a hollow interior space receiving at least in part the optical module 1. A cover 14b, at least partly transparent, is coupled to the body 14a to close the interior space. As illustrated, the cover 14b also forms a recess, partially receiving the optical module 1, in particular all or part of the projection optics 18.
    The cover 14b is for example made of plastic resin or other suitable plastic. The lighting projector 10 may include several optical modules 1 which are then adapted to emit neighboring beams, the beams preferably overlapping in part. In particular, the lateral ends of the neighboring beams can be superimposed.
    When it is intended to be arranged at the front, the photometric functions that can be implemented by using the optical module 1 (possibly in addition to those that it implements as a lighting device) include a direction change indication function, a daytime running light function known by the acronym DRL, for "Daytime Running Light", a front light signature function, a position light function, a so-called "Side- marker ”, which comes from English and can be translated by side signage.
    When it is intended to be arranged at the rear, these photometric functions include a reversing indication function, a stop function, a fog function, a direction change indication function, a rear light signature function, a lantern function, a side signaling function.
    In the case of a rear light signaling function, the light source 2 may be red. In the case of a function for a front light, the light source 2 is preferably white.
    Preferably, the light source 2 is inclined so that the emission axis of the lens 4 is spaced from the optical axis of the lens 4 or from the optical imaging part IP1 in the plane defined by the axes optics of the projection optics 18 and of the lens 4 or of the projection optics 18 and of the part IP1, respectively according to the variant adopted, in the direction of the projection optics 18. As is clearly visible on the FIG. 1 or FIG. 3, the light source 2 remains opposite the reflection zone of the matrix of micro-mirrors 6 or other reflection zone of the spatial modulator 3, in order to optimize the sharpness of the image. Although this sharpness is not important in itself for many applications, it guarantees the absence of light overflowing beyond the perimeter P6 of the reflection zone. This therefore avoids losses and peripheral heating in the space modulator 3, which is potentially dangerous.
    In this case, the light source 2 can advantageously be placed at a short distance, for example less than 10 or 15 mm, from the lens 4 which is here convergent. As is clearly visible in particular in FIG. 3, this still makes it possible to obtain a flared beam shape for the light rays of the radiation R1 propagating between the light emission unit 20 and the matrix of micro-mirrors 6 Alternatively or additionally, the light emission unit 20 comprises a reflecting mirror.
    With reference to FIG. 1, the matrix of micro-mirrors 6 is here essentially defined by an electronic chip 7, fixed to a printed circuit board 8 via a suitable connector (or “socket”) 9. A cooling device, here a radiator 11, is fixed to the printed circuit board 8 to cool the printed circuit board 8 and / or the chip 7 of the micro-mirror array
    6. To cool the chip 7 of the micro-mirror array 6, the radiator 11 may have a protruding relief passing through an opening in the printed circuit board 8 to be in contact with this chip 7, the connector 9 allowing free passage for this salient relief. A thermal paste or any other means favoring thermal exchanges, accessible to those skilled in the art, can be interposed between the protruding relief and the matrix of micro-mirrors 6.
    The matrix of micro-mirrors 6 is for example rectangular. The array of micro-mirrors 6 thus mainly extends along a first direction of extension, between lateral ends of the array of micro-mirrors 6. According to a second direction of extension, which can correspond to a vertical dimension (height ), there are also two opposite end edges which are typically parallel to each other.
    The first part IP1 of the IMS imaging system makes it possible to obtain homogeneity of the illumination on the matrix of micro-mirrors 6, the radiation R1 corresponding to an illumination with a spatial variation of the emittance similar to that of the source. luminous 2. Indeed, the inclination makes the variation in emittance slow and limited. To avoid creating a chromatism problem from the stage of illumination of the micro-mirror array 6, it is optionally possible to use an optic that is as sensitive as possible to variations in wavelength (for example for a single lens 4, a crown glass can be used, preferably a crown glass of the PSK53 type).
    With reference to FIGS. 1 and 3, the light module 1 has a first optical element 21 arranged as an input lens for the projection optics 18, making it possible to capture the second radiation R2. A spherical biconvex lens can constitute this first optical element 21. Depending on the direction of propagation of the light (away from the micro-mirror array 6), there is then provided a group of diopters downstream of the first optical element 21 , allowing to define a back-focusing system, preferably with at least one additional convergence.
    As illustrated, the first optical element 21 can be placed downstream and in a position adjacent to the intersection zone 30 of the lighting beam corresponding to the radiation R1 and the reflected beam corresponding to the radiation R2 in the activated state of all the pixels of the spatial modulator 3. It is dimensioned to capture all or most of the reflected beam.
    The projection optics 18 ensures that the marginal rays are collimated, so that the light reaching an input diopter of the lens assembly which follows this input diopter is not lost. An achromatic doublet 24 can for example be provided as the last optical element.
    The back-focusing effect is obtained here by the presence of a converging lens 22 and a diverging lens (which may possibly be part of the achromatic doublet 24 or be formed by an independent lens 23). This achieves the short focal length typically required when the light module 1 is to operate with a wide field (wide angle), with the length of counter-grid required by the lighting and the geometry of the beam reflected by the matrix of micro-mirrors. 6.
    The example illustrated is by no means limiting. Typically, one can place the doublet 24 optionally omitting the lens 23, or one can place a single lens to replace the doublet 24, with in this case a lens 23 formed in a specific glass different from that used in the following single lens . It is understood that the assembly formed by the elements 23 and 24 makes it possible to reduce the chromatic aberrations. Optionally, for example for a monochromatic application such as a rear light, the lens 23 can be omitted and a single lens, instead of a doublet, as the final element replacing the doublet 24.
    In alternative embodiments, it is possible to add more lenses and at least two different materials (glass with low chromatic dispersion of the crown type on the one hand, and flint glass generally called “flint” in the optical field on the other hand) used to correct geometric aberrations and cancel first order chromatism. The light module 1 can thus provide outgoing radiation corresponding substantially to visible white light, or possibly yellowish.
    Optionally to allow the chromaticism to be canceled more effectively, the projection optics further comprises a crown glass, typically thinner than the other lenses of the projection optics 18, and placed between two lenses of the projection optics 18 , for example between two final lenses.
    The type of configuration of the projection optic 18, shown in the figure is well suited when the draw of this optic is determined by the imposed position of its input diopter, knowing that the surface of its entrance pupil must generally be at least equal to that of this input diopter. The focal length of the projection optics 18 can be determined by the desired angular opening of the beam, horizontally or vertically, depending on the ratio between the aspect ratio the reflection surface of the matrix of micro-mirrors 6 and the ratio of the horizontal and vertical openings desired for the beam to be projected (the opening in the other direction can be reached using an anamorphosis).
    One of the advantages of the light module 1 is that it makes it possible to project a homogeneous light beam with an optimized power in relation to the energy supplied to the light source 2 and the possibility of making the incident R1 radiation exactly coincide with the size and shape of the active structure of the spatial modulator 3. This makes the light module 1 suitable for wide aperture optics.
    It should be obvious to those skilled in the art that the present invention allows embodiments in many other specific forms without departing from the scope of the invention as claimed.
    Thus, while the optical module 1 has been illustrated for a case in which the projection screen E1 is defined internally with respect to the transparent wall forming the crystal of the transparent cover 14b, it is understood that part of the transparent cover 14b or another element forming part of the external housing 14 can define the projection screen. The projection optics 18 can for example be focused on a film formed on the internal side of the glass rather than on a separate screen.
    Also, additional functions can be implemented as required. For example, it is understood that an indication or marking can be added within the outgoing light beam 40. The light module 1 can have optical imaging with large digital apertures (0.6 or 0.7, for example not limiting). The use of a pixelated high-definition spatial modulator 3 and the correction of aberrations makes it possible to form characters (letters, numbers or the like) with sufficient resolution to allow messages to be displayed to persons outside the vehicle. or pictograms which are, for example, representative of the activation of a functionality or of a vehicle operating context.
    权利要求:
    Claims (16)
    [1" id="c-fr-0001]
    1. Light module (1) for a motor vehicle, intended to shape a light beam, the light module comprising:
    - a light source (2),
    - an imaging system (4, 18) adapted to create an image of the light source (2),
    - a high definition pixelated spatial modulator (3), having a reflection zone having a determined format, characterized in that the imaging system (IMS) comprises at least two optical elements (4, 21, 22, 23, 24 ; 41, 42) distributed upstream and downstream of the high definition pixelated spatial modulator (3) following the direction of propagation of the light emitted by the light source (2), so that there is at least one element of the upstream imaging system and at least one element of the downstream imaging system of the high definition pixelated spatial modulator (3), the imaging system (IMS) comprising, in a first imaging part (IP1) , a lens (4) for adjusting to a dimension characteristic of the determined format, suitable for concentrating radiation from the light source (2).
    [2" id="c-fr-0002]
    2. Light module according to claim 1, in which the high definition pixelated spatial modulator (3) is defined by a matrix of micro-mirrors (6) having a reflection zone whose largest dimension is greater than the largest dimension of the light source.
    [3" id="c-fr-0003]
    3. Light module according to claim 1 or 2, wherein the determined format of said reflection zone has a rectangular perimeter format.
    [4" id="c-fr-0004]
    4. Light module according to claim 1,2 or 3, in which at least one of the optical elements of the imaging system (IMS) forms said first imaging part (IP1) which comprises:
    - the adjustment lens (4) for the adjustment to the determined format, designed and arranged to concentrate the radiation from the light source (2) by defining a shape of the outline of the radiation which corresponds to the shape of a perimeter (P6 ) of the reflection zone defined by the high definition pixelated spatial modulator (3).
    [5" id="c-fr-0005]
    5. Light module according to claim 3 or 4, wherein the first imaging part (IP1), arranged upstream of the high definition pixelated spatial modulator (3), has at least one transparent optical element with anamorphic effect.
    [6" id="c-fr-0006]
    6. Light module according to claim 3, 4 or 5, wherein the first imaging part (IP1), arranged upstream of the high definition pixelated spatial modulator (3), presents a mirror with anamorphic effect.
    [7" id="c-fr-0007]
    7. Light module according to any one of claims 3 to 6, in which the high definition pixelated spatial modulator (3) comprises an array of micro-mirrors (6), the micro-mirrors (12) of the array of micro - mirrors (6) each being movable between:
    - A first position in which the micro-mirror (12) is arranged to reflect light rays of a first radiation (R1) reaching it from the first imaging part (IP1) of the imaging system, in the direction of projection optics (18) including a second part of the imaging system (IMS),
    - And a second position in which the micro-mirror (12) is arranged to reflect the light rays of the first radiation (R1) reaching it from the first imaging part (IP1) of the imaging system, away from projection optics (18).
    [8" id="c-fr-0008]
    8. Light module according to any one of claims 1 to 6, in which the high definition pixelated spatial modulator (3) comprises a reflective display zone of the liquid crystal on silicon type.
    [9" id="c-fr-0009]
    9. Light module according to any one of claims 1 to 7, comprising projection optics (18), in which the high definition pixelated spatial modulator (3) comprises a matrix of micro-mirrors (6) distributed in a plane , said matrix defining an optical axis (A) which passes centrally through the projection optics (18), and in which active micro-mirrors of the micro-mirror matrix (6) are in an active state pivoted by a determined angle, preferably between 6 and 15 °, towards an optical element (4; 41, 42) of converging type located upstream of the high definition pixelated spatial modulator (3) and which belongs to the imaging system (IMS) .
    [10" id="c-fr-0010]
    10. Light module according to any one of the preceding claims, in which an optical element (4; 41,42) of converging type, located upstream of the high definition pixelated spatial modulator (3) and which belongs to the imaging system. (IMS):
    - defines, from the light (R0) emitted by the light source (2), a first radiation (R1) projected onto a reflection zone of the high definition pixelated spatial modulator (3) by forming on this reflection zone a intermediate image which is deformed by said optical element (4; 41, 42) of convergent type,
    - comparatively extends further from the high definition pixelated spatial modulator (3) and closer to another optical element (21) on which a second radiation (R2) is directed directly resulting from a reflection of the first radiation (R1 ) on the high definition pixelated spatial modulator (3), the other optical element (21) forming a first optical element (21) of a projection optic (18) belonging to the imaging system (IMS).
    [11" id="c-fr-0011]
    11. Light module according to claim 10, in which the projection optics (18) comprises, successively in this order, in a direction of distance relative to the high definition pixelated spatial modulator (3):
    - the first optical element (21) arranged as an input lens of the projection optic (18) to capture the second radiation (R2);
    - a pair of optical elements (22, 24) making it possible to reduce the focal distance of the projection optics (18) compared to a greater focal distance which would be obtained for the projection optics (18) in the absence of said pair of optical elements (22, 24).
    [12" id="c-fr-0012]
    12. Light module according to claim 11, wherein the projection optics (18) further comprises an achromatic doublet (24), preferably forming one of the optical elements of said pair of optical elements (22, 24).
    [13" id="c-fr-0013]
    13. Light module according to any one of the preceding claims, in which the light source (2) is part of a light emission unit (20) provided with at least one reflecting surface distinct from the pixelated spatial modulator at high definition (3) and allowing to orient the
    10 light source (2) in a direction of distance of the light with respect to a reflection zone of the high definition pixelated spatial modulator (3).
    [14" id="c-fr-0014]
    14. Light module according to any one of the preceding claims, comprising a projection screen (E1) parallel to an area of
    [15" id="c-fr-0015]
    15 reflection of the high definition pixelated spatial modulator (3), a second part (18) of the imaging system (IMS) being adapted to create said image on the projection screen (E1), from an intermediate image of the light source formed on the reflection zone by using a first part (4) of the imaging system (IMS), said intermediate image extending entirely inside
    2 0 of a perimeter (P6) of the reflection zone.
    15. Light module according to any one of the preceding claims, in which the light source (2) consists essentially of a light-emitting diode or of several light-emitting diodes
    2 5 in particular grouped on a common support.
    [16" id="c-fr-0016]
    16. Headlight (10) for a motor vehicle, comprising a headlight housing (14) and at least one optical module (1) according to any one of the preceding claims.
    1/3
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    同族专利:
    公开号 | 公开日
    US10571091B2|2020-02-25|
    CN108826217B|2021-08-27|
    EP3396241A1|2018-10-31|
    CN108826217A|2018-11-16|
    US20180313510A1|2018-11-01|
    FR3065784B1|2019-10-11|
    引用文献:
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    US20150160454A1|2013-12-09|2015-06-11|Texas Instruments Incorporated|Multiple Illumination Sources for DMD Lighting Apparatus and Methods|
    US20150377442A1|2014-06-26|2015-12-31|Texas Instruments Incorporated|Pixelated Projection for Automotive Headlamp|
    US20160347237A1|2015-05-28|2016-12-01|Texas Instruments Incorporated|Methods and Apparatus for Light Efficient Programmable Headlamp with Anamorphic Optics|
    FR3041073A1|2015-09-15|2017-03-17|Valeo Vision|DIGITAL SCREEN LIGHT BEAM PROJECTION DEVICE AND PROJECTOR PROVIDED WITH SUCH A DEVICE|
    CN100504506C|2005-06-07|2009-06-24|佳世达科技股份有限公司|Optical system for projector|
    CN102563493A|2012-01-16|2012-07-11|安徽师范大学|Design method for adaptive automobile headlamp based on digital micromirror device|
    DE102014203335A1|2014-02-25|2015-08-27|Automotive Lighting Reutlingen Gmbh|Light module of a motor vehicle headlight and headlights with such a light module|ES2832877T3|2017-12-01|2021-06-11|Marelli Automotive Lighting Italy Spa|Automotive lighting unit|
    WO2020051276A1|2018-09-05|2020-03-12|Flex-N-Gate Advanced Product Development, Llc|Programmable glare-free high beam|
    DE102018008760A1|2018-11-08|2019-04-25|Daimler Ag|Vehicle headlight with a light source|
    DE102019102475A1|2019-01-31|2020-08-06|HELLA GmbH & Co. KGaA|Lighting device for a motor vehicle, in particular high-resolution headlights|
    WO2021022380A1|2019-08-07|2021-02-11|Lensvector Inc.|Light source having a variable asymmetric beam|
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    法律状态:
    2018-04-26| PLFP| Fee payment|Year of fee payment: 2 |
    2018-11-02| PLSC| Search report ready|Effective date: 20181102 |
    2019-04-29| PLFP| Fee payment|Year of fee payment: 3 |
    2020-04-30| PLFP| Fee payment|Year of fee payment: 4 |
    2021-04-29| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1753756|2017-04-28|
    FR1753756A|FR3065784B1|2017-04-28|2017-04-28|LUMINOUS MODULE WITH OPTICAL IMAGING OPTICS FOR A PIXELLIZED SPATIAL MODULATOR FOR A MOTOR VEHICLE|FR1753756A| FR3065784B1|2017-04-28|2017-04-28|LUMINOUS MODULE WITH OPTICAL IMAGING OPTICS FOR A PIXELLIZED SPATIAL MODULATOR FOR A MOTOR VEHICLE|
    EP18168421.8A| EP3396241A1|2017-04-28|2018-04-20|Light module with imaging optics optimised for a pixelated spatial modulator, intended for a motor vehicle|
    US15/964,743| US10571091B2|2017-04-28|2018-04-27|Light module with optimized optical imaging for a pixellated spatial light modulator, intended for a motor vehicle|
    CN201810402242.1A| CN108826217B|2017-04-28|2018-04-28|Lamp module for a motor vehicle with optimized optical imaging for pixelated spatial light modulator|
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