• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to an optical element for influencing a light emitted by a light source (1) which has a front side (2) facing away from the light source (1) and a rear side (3) facing the light source (1). On the rear side (3), a recess (4) for the entry of the light is formed and also a deflecting surface area (5) and on the front side (2), a front surface area (6) is formed. In this case, the design is such that first light beams (L1) of the light which enter the optical element via the recess (4) are totally reflected at the deflecting surface region (5) and subsequently the optical element via the front surface region (6) leave. In this case, the front surface area (6) is shaped such that second light beams (L2) of the light, which enter the optical element via the recess (4) and then impinge directly on the front surface area (6), undergo total internal reflection there. By this design of the front surface area (6) can be achieved that light rays of the light source (1), which have a relatively high intensity, are distributed over a larger area, so that overall the maximum luminance of over the front surface area (6) emitted Light is reduced.
    公开号:AT15178U1
    申请号:TGM461/2013U
    申请日:2013-12-30
    公开日:2017-02-15
    发明作者:Ebner Stephan
    申请人:Zumtobel Lighting Gmbh；
    IPC主号:
    专利说明:

    description
    OPTICAL ELEMENT, AS REGARDS LIGHT DISPENSING
    The invention relates to an optical element for influencing a light emitted by a light source, and to an arrangement for emitting light with such an optical element.
    From DE 10 2012 205 067 A1, a luminaire with an LED light source (LED: light-emitting diode) and a lens arrangement for optically influencing the light emitted by the LED light source is known. The main body of the lens assembly is approximately frusto-conical and has on its, the LED light source facing back on a recess for the LED light source. The recess consists of a convex shaped bottom surface and side surfaces. Light rays entering the lens assembly via the bottom surface are bundled by the latter and then exit on the front side opposite the recess; At the same time, these light beams experience no further interaction with a boundary surface of the lens arrangement. Light rays which enter the lens arrangement via the side surfaces of the depression are totally reflected at the lateral surfaces of the lens arrangement formed by the truncated cone shape and subsequently also emerge again via the front side.
    It has been found that in such a lens arrangement in a central region of the light output, a relatively high luminance occurs. This bright area is due to those rays of light which enter the lens assembly via the bottom surface of the recess and then exit directly through the front. Due to this high luminance, the light output to a viewer who looks at the front of the lens assembly, usually unpleasant.
    To avoid this problem lens systems are already known from the prior art; However, these systems have mirrored surfaces, which must be produced in an additional processing step.
    The invention has for its object to provide a corresponding improved optical element. In particular, the optical element should have improved optical properties with a simple production possibility. In addition, an arrangement for emitting light to be specified with such an optical element.
    This object is achieved according to the invention with the objects mentioned in the independent claims. Particular embodiments of the invention are indicated in the dependent claims.
    According to the invention, an optical element for influencing a light emitted from a light source is provided, which has a front side facing away from the light source and a, the light source facing back. At the rear side, a light entrance area for entering the light is formed, and also a deflecting area, and at the front side, a front surface area is formed. In this case, the design is such that first light beams of the light which enter the optical element via the light entry region are totally reflected at the deflecting surface region and subsequently leave the optical element via the front surface region. In this case, the front surface area is shaped such that second light beams of the light, which enter the optical element via the light entry area and subsequently impinge directly on the front surface area, experience a total reflection there.
    By this design of the front surface area can be achieved that light rays of the light source, which have a relatively high intensity, are distributed over a larger area, so that overall the maximum luminance of the light emitted over the front surface area light is reduced. For example, if you look at a row of LEDs as a light source, they enter - without an optical element
    Light off, which shows high luminance points; By using the optical element, these selectively high luminances can be spread apart, so to speak.
    Preferably, the optical element is designed such that the second light rays - at least partially - after they have experienced the total reflection at the front surface area, learn on the deflecting surface area a further total reflection. This allows a particularly efficient utilization of the light.
    Preferably, the front surface area is formed by a, to be directed to the light entry area depression or has such a depression. In this way, it can be achieved particularly suitably that the second light beams are totally reflected at the front surface area. In particular, no mirrored surface is required for deflecting the respective light beams.
    Preferably, the optical element is shaped such that all light rays of the light, which enter the optical element via the light entry region and leave the optical element via the front surface area, experience at least a total reflection at an interface of the optical element. As a result, a maximum luminance of the light output can be reduced particularly effectively.
    Preferably, the optical element is symmetrically shaped with respect to an axis of symmetry or a plane of symmetry. As a result, a particularly uniform light output over the front surface area can be achieved.
    Preferably, the deflecting surface area is stepped, in particular multi-stepped. As a result, it can be achieved that the light beams are distributed over a particularly large area, so that high luminance levels are further reduced.
    Preferably, the light entry region is formed by a recess.
    In this way it can be achieved that suitably especially much of the light emitted by the light source enters the optical element.
    Preferably, the recess has a bottom wall and side walls.
    As a result, a particularly simple design of the recess with high lighting efficiency can be achieved. A particularly simple and suitable design is made possible when the bottom wall and the side walls are flat. A particularly suitable bundling of the light beams when entering the optical element can be achieved if the bottom wall and the side walls are convex. It can also be provided that the bottom wall is shaped plan and the side walls are convex or vice versa.
    Preferably, the recess is adapted to receive two LEDs.
    Preferably, the optical element is designed in the form of a profile element. This makes possible a particularly suitable production of the optical element.
    According to a further aspect of the invention, an arrangement for emitting light is provided which has a light source for emitting a light and an optical element according to the invention, wherein the arrangement is designed such that the light enters the optical element at least partially via the light entry region , Preferably, the light source comprises at least one LED, because the optical element is particularly suitable for "high resolution" high luminance, as they occur in LEDs "dissolve".
    Preferably, the optical element is designed in the form of a profile element, wherein the light source comprises a plurality of LEDs which are arranged along a row which extends parallel to the main axis of the profile element. As a result, a particularly effective reduction of the luminance can be achieved with a simple production possibility.
    The invention will be explained in more detail below with reference to an embodiment and with reference to the drawings. 1 shows a perspective sketch of an arrangement for emitting light with an optical element according to the invention, [0024] FIG. 2 shows a cross-sectional sketch through the optical element and a light source
    3, a schematic sketch of the course of first and second light beams, [0026] FIG. 4 a cross-sectional sketch of a variant of the optical shown in FIG
    Elements, Fig. 5 is a sketch of different configurations of the back of the optical
    6 shows a perspective, translucent sketch of a further variation of the optical element, FIG. 7 shows a cross-sectional sketch around one half of the recess of the optical element, [0030] FIG. Fig. 8 is a perspective sketch of an end portion of an optical element with
    [0031] FIG. 9 shows a corresponding, somewhat more detailed representation, [0032] FIG. 10 shows a perspective sketch of a longitudinal section along the plane of symmetry of the optical element, [0033] FIG. 11 shows a perspective sketch of an embodiment with a profile-shaped
    Recess, Fig. 12 is a cross-sectional diagram showing a variation in which the recess has a double-convex curved bottom wall and convex-curved side walls, and Fig. 13 shows two perspective sketches showing a variation with a circular shape
    Recesses.
    In Fig. 1 is an example of an inventive arrangement for emitting light when viewed from obliquely below sketched. The arrangement can - as indicated in Fig. 1 - be designed as a lamp, for example as a ceiling light, so that a light output is provided down. In the present description, it is assumed that such an orientation of the arrangement relative to the vertical. In general, however, can also be provided a different orientation; in this case, the present directions, etc. are to be reinterpreted accordingly.
    In the example shown in Fig. 1, the arrangement has a cuboid, downwardly open housing, in which an optical element according to the invention for influencing a light emitted by a light source is arranged. Through the housing, a downward-facing light-emitting opening is formed, wherein the optical element is arranged inserted into this light-emitting opening. Also, the light source is disposed within the housing, but not directly visible in Fig. 1, because it is behind the housing wall or behind the optical element.
    The optical element is elongated in the example shown here, so that it extends along a longitudinal axis L. The housing also preferably extends along the longitudinal axis L.
    In Fig. 2 is a cross section through the optical element normal to the longitudinal axis L sketched. In addition, in Fig. 2, a corresponding light source 1 is sketched in the form of an LED. Furthermore, light beams are shown by way of example in FIG. 2, which represent a light emitted by the light source 1 and illustrate the passage of the light through the optical element.
    The optical element has a front 2 and a back 3, wherein the front side 2 is provided to be oriented away from the light source 1 to be arranged and the back 3 for the light source 1 facing oriented to be arranged. In the above-mentioned exemplary orientation of the arrangement and of the optical element shown here, the rear side 3 of the optical element faces upwards and the front side 2 downwards.
    At the back 3 of the optical element, a light entry region, in particular in the form of a recess 4 is formed, which is provided for the entry of the light emitted from the light source 1. In particular, it may be provided that the recess 4 has an edge region 45 which extends in an example horizontal plane E.
    It is preferably provided that the light source 1 is at least partially disposed in the recess 4 or so that it is at least partially disposed below the plane E. This allows a particularly direct entry of the light into the optical element.
    In Fig. 3, a further cross-section is normal to the longitudinal axis L outlined, comprising a section of the optical element and the light source 1. The recess 4 is preferably designed such that it has a bottom wall 41 and side walls 42. In the example shown here, the bottom wall 41 and the side walls 42 are plan shaped. The light emitted by the light source 1 basically enters a part via the bottom wall 41 and to a further part via the side walls 45 into the optical element.
    In the example outlined in Figures 2 and 3, the light source 1 is formed by at least one LED having a plane, for example, light-emitting surface, wherein the LED is aligned here so that the light-emitting surface horizontally and downwards oriented. In this case, the light-emitting surface is preferably arranged completely below the plane E.
    Typically, light beams are emitted by an LED in all directions of a half-space, wherein the half-space is determined, for example, by the flat light-emitting surface of the LED; In the example shown, the light is emitted into the lower half-space. Here are "forward", here "down" - that is, in a small solid angle area around the surface normal of the plane emitting light surface around or around the vertical around - emitted light rays that have a higher intensity than other light rays, the more to the sides, so flatter. Therefore, here, light rays which enter the optical element via the bottom wall 41 of the recess 4 have a higher intensity than those light rays which enter the optical element via the side walls 42 of the recess 4.
    On the back 3 of the optical element, a deflecting surface area 5 is also formed and on the front side a front surface area 6, wherein the design is such that - as indicated in principle in Fig. 3 - first light rays L1 of the light over the recess 4 enter the optical element, are totally reflected at the deflecting surface area 5 and subsequently leave the optical element via the front surface area 6. By way of example, the design is such that all light rays which enter the optical element via the side walls 42 of the recess 4 are totally reflected at the deflecting surface region 5 and subsequently leave the optical element via the front surface region 6; in other words, the first light beams L1 preferably include all light rays entering the optical element via the sidewalls 42.
    The front surface area 6 is designed shaped such that second light beams L2 of the light, which enter via the recess 4 in the optical element and then impinge directly on the front surface area 6, where there is a total reflection experi Ren. With "immediate" should It is hereby expressed that the second light beams L2 do not experience any interaction with a surface region of the optical element between their entry into the optical element via the light entry region or the recess 4 and their impact on the front surface region 6.
    As sketched by way of example in FIG. 3, the design is furthermore preferably such that the second light beams L2, after their total reflection at the front surface area 6, experience a further total reflection at the deflecting surface area 5, before they reach the front surface area 6 leave optical element. In this case, it can be provided that at least a predominant part of the second light beams L2, particularly preferably all second light beams L2, upon passing through the optical element experience only the two or exactly the two total reflections mentioned.
    Preferably, the design is such that all light rays that enter the optical element via the bottom wall 41 of the recess 4 are totally reflected directly on the front surface area 6; in other words, the second light beams L2 preferably include all the light beams entering the optical element via the bottom wall 41.
    In this way it can be achieved in particular that light rays of the light source, which have a comparatively high intensity, are directed towards the sides and thus distributed over a larger or horizontally wider region. This makes it possible to achieve that the maximum luminance of the light output via the front surface area 6 is reduced. This is generally more comfortable for a viewer looking at the front side 2 of the optical element.
    Preferably, in this case, the optical element is shaped such that all light rays of the light of the light source 1, which enter the optical element via the recess 4 and leave the optical element via the front surface area 6, at least a total reflection at an interface of experienced optical element. For this purpose, provision can be made, in particular, for all the light beams of the light to enter the optical element either via the bottom wall 41 of the recess 4 or via the side walls 45 of the recess 4, preferably all the light beams which enter via the bottom wall 41, the second light beams L2 form and all those light rays that enter via the side walls 42, the first light rays form L1.
    In order to bring about the deflection of the first light beams L1 in a particularly suitable manner, the front surface area 6 preferably has a recess 7 directed toward the light entry area or the recess 4. In the orientation shown here, therefore, the depression "up" is formed. In particular, the front surface area 6 may be formed by such a recess 7. The recess 7 can be advantageously designed manufacturing technology as a notch.
    In the example shown in Fig. 2, the front surface portion 6 has a first portion 61 and a second portion 62, wherein the recess 7 is formed by the first portion 61; The second portion 62 may be designed to extend in a plane E 'plan, wherein the further plane E' is preferably oriented parallel to the first-mentioned plane E, so also horizontally.
    Preferably, the optical element is symmetrically shaped with respect to an axis of symmetry or plane of symmetry. For example, the optical element may be designed rotationally symmetrical about a vertical axis.
    In the example shown, the optical element is formed symmetrically with respect to a vertical plane of symmetry S. The recess 4 is formed around the plane of symmetry S, so that the optical element is suitable for a "central" light source. The deflecting surface area 5 in this case has two portions, one on each side of the recess 4 and the plane of symmetry S.
    Preferably, accordingly, in particular, the recess 7 is designed symmetrically with respect to the plane of symmetry S. As a result of the described shaping, the optical element has, as it were, two "lens wings" which are formed symmetrically with respect to the plane of symmetry S.
    As implicitly apparent from FIG. 1, the optical element can advantageously be designed in terms of manufacturing technology in the form of a profiled element; In this way, as it were, a "translational lens" can be formed by the optical element. The optical element can be advantageously produced in this case, for example by extrusion or injection molding.
    Through the recess 7, a beam splitter for the forwardly directed light beams is formed in the example shown; through this, those light beams, which have a particularly high intensity, deflected towards the sides. As a result, a maximum luminance can be reduced particularly effectively. As can be seen from FIG. 2, the optical element can thus be used to spread the light of the light source 1 within the lens wings and to distribute the high luminances of the relatively small light source 1 over a comparatively large area. The light output from the optical element acts in this way for a viewer much more pleasant.
    In Fig. 4 a variant is sketched, wherein the reference numerals are used analogously. In contrast to the example shown in FIG. 2, here, the deflecting surface region 5 is designed to be stepped several times. With this design, the light can be particularly suitable and evenly distributed to the sides or in the lens wings. The steps of the deflecting surface region 5 thus formed may be provided with a structure, for example a prism or pyramidal structure, or may be corrugated or designed in accordance with a special, for example curved, geometry, for example being lenticular; As a result, the light can be directed specifically targeted to further reduce luminance of the reflective surfaces. In particular, the inclinations of surfaces or flank regions of the steps can be selected accordingly.
    The deflecting surface region 5 may in particular be such that it has both structural elements which are designed to extend in a manner parallel to the longitudinal axis L, as well as further structural elements which are formed extending transversely thereto, in particular at right angles to the longitudinal direction L. In this way, it is particularly possible to realize an influence on the directional distribution of the light emission of the optical element or of the arrangement in different vertical planes.
    Also, the second portion 62 of the front surface area 6 may have a structuring; This makes it particularly suitable to achieve a further light control. This structuring of the front surface area 6 may also comprise structural elements which extend parallel to the longitudinal axis L, as well as further structural elements which extend transversely thereto, in particular at right angles to the longitudinal direction L.
    By choosing a design of the deflecting surface region 5, the radiation characteristic of the arrangement can be varied to a considerable extent. This is indicated in Fig. 5, in which in each case a corresponding optical element in cross-section is shown in three rows and right next to each associated with a light distribution curve. In the example shown in the upper row, a broad light emission is produced which shows two lateral wings in the sense of a so-called Batwing distribution. In the example shown in the middle row, a Batwing distribution is also generated, but here the two wings of the distribution are narrower. In the example shown in the lower row, a light distribution is created in which the two wings are directed more forward in total, so that they overlap one another clearly.
    The different light distributions can be achieved without having to change the front side 2 of the optical element for this purpose. Therefore, corresponding differently acting optical elements can advantageously be produced using an injection molding process.
    Tool are made in which only the, the back forming insert is replaced; This is advantageous with respect to the production. The optical elements thus produced accordingly each have similar front sides, so that when they are sketched as in Fig. 1, inserted in a housing, they all show the same appearance.
    In Fig. 6, a further variation of the optical element is sketched in perspective, in which the front surface area 6 is formed by a corresponding recess 7, that has no horizontal planar areas. In this way, so to speak, two "oblique" lens blades are formed. By such a variation of the front surface area 6, the emission characteristic of the optical element can be further advantageously changed.
    Fig. 7 shows a cross-sectional sketch around one half of the recess 4 of the optical element around. Here, only the right half of the recess 4 is outlined, because the recess 4 is symmetrical about the symmetry plane S as mentioned above in this example. The bottom wall 41 of the recess 4 is designed plan and the side walls 42 of the recess 4 are also designed plan. The first light beams L1 enter the optical element via the bottom wall 41 of the recess and the second light beams L2 pass over the side walls 42. Such a "simple" design which divides the light into two "main beam paths" or "light paths" has proved to be particularly suitable. The "light path" with the single total reflection accordingly enters the optical element via the sidewalls 42 and the "light path" with twice the total reflection over the bottom wall 41. However, deviating geometrical designs may be advantageous for achieving special radiation characteristics.
    The recess 4 may be adapted to receive a light source 1 in the form of multiple LEDs. By way of example, an embodiment is sketched in Fig. 8, in which the recess 4 is designed to accommodate at least two, in particular, exactly two LEDs T, 1. In this case, as outlined, a plurality of recesses 4, 4 'can be provided in a row extends parallel to the longitudinal axis L, wherein each of the recesses 4, 4 'for receiving at least two LEDs T, 1 "and T", 1 "" is designed.
    In Fig. 9 is a somewhat detailed sketch is shown. In this embodiment, the recess 4 or each of the recesses 4, 4 'has two further side walls 47, which extend transversely with respect to the longitudinal axis L. By means of these further side walls 47, glare reduction in the longitudinal direction, that is to say in a direction parallel to the longitudinal axis L, can be achieved in a particularly suitable manner. As sketched in FIG. 10, which shows a corresponding sectional view along the plane of symmetry S, further surface areas 48 are preferably formed by the further side walls 47, at which light beams of the light which enter the optical element via the further side walls 47 are totally reflected ,
    If a corresponding longitudinal glare is not required or otherwise generated, that is, only the "transverse distribution" of the radiation characteristic is important, can be dispensed with the formation of the other side walls 47 and the recess 4 are made advantageous manufacturing profile shape, as shown in FIG 11 outlined. This is advantageous because the optical element in this case can be made particularly suitable as an extrusion or injection-molded part.
    In Fig. 12 is a cross-sectional sketch is shown to a variation of the optical element, in which the recess 4 has a convex-shaped or multi-convex shaped, for example, doubly convex shaped bottom wall 41 'and convexly curved side walls 42' , As a result, the light beams can be suitably precollimated or bundle particularly suitable when entering. In this way, the light can be used even more efficiently for the light output and make the optical element with a lower material thickness.
    In addition, in this case, an outer part 51 of the deflecting surface region 5 can be structured and - separated from it - an inner part 52 of the deflecting surface region 5 for the achievement of total reflection "steep" are designed. This makes it possible to achieve a suitable glare reduction effect.
    The front surface area 6 here has a first, inner portion 61 and a second, outer portion 62, wherein the recess 7 is formed by the first portion 61; However, the second portion 62 is not designed here, as in the example shown in FIG. 2, extending horizontally, but slightly inclined forward. The second portion 62 may in this case be provided with a structuring in order to achieve a specific light emission characteristic.
    In Fig. 13, two perspective views of a variation are sketched, according to which the recesses 4, 4 'are designed with boundary walls, are defined by the outer surfaces of each conical section shapes. This is particularly advantageous in terms of achieving posting in all vertical levels.
    With an arrangement according to the invention or an optical element according to the invention can selectively high luminance, as typically generated by LEDs in the forward radiation, distribute to the "lens wing" of the optical element and thus significantly reduce. The light can be selectively directed through a plurality of surface regions (recess 4, deflecting surface region 5, front surface region 6) and thus produce a desired emission characteristic. No mirrored surfaces are needed. The optical element is also suitable for several LEDs per recess. By exclusively varying the back of the optical element, the radiation characteristics of a corresponding arrangement for emitting light can be changed.
    The arrangement according to the invention is particularly suitable for continuous line luminaires, linear luminaires and retrofit applications, in which fluorescent tubes are replaced by LED lines.
    权利要求:
    Claims (14)
    [1]
    claims
    1. An optical element for influencing a light emitted by a light source (1), comprising - one, the light source (1) facing away from the front (2) and - one, the light source (1) facing back (3), wherein at the back ( 3) a light entry region (4) is formed for the entry of the light and also a deflecting surface region (5) is formed and on the front side (2) a front surface area (6) is formed, wherein the design is such that first light rays (L1 ) of the light, which enter the optical element via the light entry region (4), are totally reflected at the deflecting surface region (5) and subsequently leave the optical element via the front surface region (6), characterized in that the front surface region (6 ) is shaped so that second light beams (L2) of the light, which enter and connect to the optical element via the light entry region (4) nd impinge directly on the front surface area (6), there experience a total reflection.
    [2]
    2. An optical element according to claim 1, which is designed such that the second light beams (L2) - at least partially - after they have experienced the total reflection at the front surface area (6), at the deflecting surface area (5) undergo a further total reflection.
    [3]
    3. An optical element according to claim 1 or 2, wherein the front surface area (6) by a, on the light inlet region (4) directed towards recess (7) or such a recess (7).
    [4]
    4. An optical element according to one of the preceding claims, which is shaped such that all the light rays of the light which enter the optical element via the light entry region (4) and leave the optical element via the front surface region (6), at least a total reflection experienced an interface of the optical element.
    [5]
    5. An optical element according to any one of the preceding claims, symmetrically shaped with respect to an axis of symmetry or plane of symmetry (S).
    [6]
    6. Optical element according to one of the preceding claims, wherein the deflecting surface region (5) is stepped, preferably multi-stepped.
    [7]
    7. Optical element according to one of the preceding claims, wherein the light entry region is formed by a recess (4).
    [8]
    8. An optical element according to claim 7, wherein the recess (4) has a bottom wall (41) and side walls (42).
    [9]
    9. An optical element according to claim 8, wherein the bottom wall (41) is formed flat or convex and / or the side walls (42) are flat or convex.
    [10]
    10. An optical element according to any one of claims 7 to 9, wherein the recess (4) is adapted to receive two LEDs (T, 1 ").
    [11]
    11. An optical element according to one of the preceding claims, which is designed in the form of a profile element.
    [12]
    12. Arrangement for emitting light, comprising - a light source (1) for emitting a light and - an optical element according to one of the preceding claims, wherein the arrangement is designed such that the light at least partially via the light entry region (4) in the optical element entry.
    [13]
    13. Arrangement according to claim 12, wherein the light source (1) comprises at least one LED (1 ', Γ, Γ', Γ ").
    [14]
    14. Arrangement according to claim 13, wherein the optical element has the features specified in claim 11 and the light source (1) comprises a plurality of LEDs (1 ', 1 ") which are arranged along a row which is parallel to the main axis of the profile element extends.
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    同族专利:
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    DE102013226181A8|2015-08-27|
    CN105829943B|2020-04-21|
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    US10024521B2|2018-07-17|
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    法律状态:
    2017-08-15| MM01| Lapse because of not paying annual fees|Effective date: 20161231 |
    2018-07-15| NFJG| Reinstatement after late payment of annual fees|Effective date: 20180611 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102013226181.0A|DE102013226181B4|2013-12-17|2013-12-17|Optical element, as well as arrangement for light emission|
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