• 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:
    A light deflection device (100) selectively reflects incident light to a projection optical system (12). An irradiation optical system (16) irradiates the light to the reflecting portion (100a) of the light deflection device (100) which comprises at least a certain region in the reflecting portion (100a), the position of which can be switched between a first reflection position (P1) in which light irradiated by the irradiation optical system (16) is reflected to the projection optical system (12) for use as part of a light distribution pattern, and a second reflection position (P2) in which the light irradiated by the irradiation optical system (16) is reflected so as not to be used. The irradiation optical system (16) is disposed in a position shifted to a side facing the front side of the reflective portion (100a) in the first reflection position (P1), with reference to a vertical plane including the axis optical projection system (12).
    公开号:FR3029597A1
    申请号:FR1561765
    申请日:2015-12-03
    公开日:2016-06-10
    发明作者:Takayuki Yagi；Misako Nakazawa
    申请人:Koito Manufacturing Co Ltd；
    IPC主号:
    专利说明:

    [0001] BACKGROUND TECHNICAL FIELD [0001] The present invention relates to a lamp unit TECHNIQUE ASSOCIATED In the associated art, there is provided a vehicle lighting device in which a reflection device where a plurality of Reflecting elements arranged in a matrix form are disposed on the front surface and selectively reflect the light emitted by a light source to irradiate the front of the vehicle in a predetermined light distribution pattern (Patent Documents 1 and 2). The reflection device is configured so that the plurality of reflective elements are respectively inclinably arranged, and the position of the plurality of reflective elements can be switched between a first position and a second position. Further, the reflection device is configured such that the position of each reflective element is suitably changed between the first position where the direction of reflection of the light from the light source contributes to the formation of a pattern of distribution of light. light and the second position where the direction of light reflection from the light source does not contribute to the formation of a light distribution pattern, so as to form a light distribution pattern to illuminate the surface of the light a road or the like. [0003] Patent Document 1: Japanese Patent Publication No. Hei 9-104288. Patent Document 2: Japanese Patent Publication No. 2004-210127. However, the reflective element described above is permuted by tilting manner about a pivot axis between the first position and the second position. As a result, it is often not possible to obtain the desired amount of light or the desired light distribution pattern when the direction or position of each component of an optical system is not taken into account as a function of the direction of the pivot axis of the reflecting element or the arrangement of the reflection device. SUMMARY [0005] Exemplary embodiments of the invention provide a lamp unit capable of obtaining a desired light distribution. A lamp unit according to an exemplary embodiment comprises a projection optical system; A light deflection device comprises a reflective portion, the light deflection device being disposed on the optical axis of the projection optical system and configured to selectively reflect the incident light to the projection optical system; and an irradiation optical system configured to irradiate light to the reflecting portion of the light deflection device, wherein the light deflection device comprises at least a certain region in the reflecting portion, the position of which can be switched between a first reflection position in which the light irradiated by the irradiation optical system is reflected back to the projection optical system so as to be effectively used as part of a desired light distribution pattern, and a second position in which the light irradiated by the optical irradiation system is reflected so as not to be effectively used, and wherein the optical irradiation system is disposed in a position offset to a side facing the front face of the the reflecting part in the first reflection position, with reference to a vertical plane including the optical axis of the projection optical system. According to this aspect, the optical irradiation system is arranged to irradiate the reflecting portion of the light deflection device from the offset position towards the side facing the front face of the portion. reflective in the first reflection position, rather than the side of the front face of the reflective portion in the second reflection position. Consequently, the angle of incidence or the angle of reflection of the light of the optical irradiation system in the first reflection position becomes smaller than the angle of incidence or the angle of reflection of the light of the light. optical irradiation system in the second reflection position. Further, since the angle of incidence and the angle of reflection are small, the reflected light, which is not incident on the projection optical system, is reduced. That is, the light of the optical irradiation system can be used without being lost. On the other hand, the desired light distribution pattern includes, for example, a headlight distribution pattern of a vehicle headlight. Furthermore, the case where the light irradiated by the optical irradiation system is not actually used as part of the desired light distribution pattern may include not only the case where the reflected light of the irradiated light does not contribute at all to the formation of the light distribution pattern, but also the case where the reflected light is included insofar as the reflected light partially contributes to the formation of the light distribution pattern but has no influence on the function of the light distribution pattern. [0008] The light deflection device may comprise a matrix of micromirrors having a plurality of mirror elements, each mirror element having a reflective surface. The position of each mirror element can be swapped between the first reflection position and the second reflection position about a pivot axis and the pivot axis can extend along the diagonal line of the reflecting surface of the mirror. the mirror element. In this way it is possible to quickly and accurately form a pattern of light distribution of various shapes. [0009] The optical irradiation system may be disposed at a location rotated about the optical axis in a range from 5 ° to 45 ° to a side closer to the front face of the reflective portion in the first reflection position, with reference to the vertical plane including the optical axis of the projection optical system. In this way, the compactness of the overall layout of the lamp and the amount of reflected light incident on the projection optical system can be compatible at a high level. [0010] The optical irradiation system may comprise a reflector configured to reflect light emitted from a light source to the light deflection device, and the reflector may be configured to focus the reflected light onto the reflective portion of the device of light deviation. In this way, the light emitted by the light source can be directed towards the reflecting part of the light deflection device without being lost. The reflective surface of the reflector may have a larger area than that of the reflective portion of the light deflection device. In this way it is possible to reduce the dimensions of the light deflection device. In the optical irradiation system, the light source may comprise a semiconductor light emitting element; and said system may comprise a compound parabolic type light concentration element configured to focus the light emitted by the light source. In this way, the light emitted by the light source can be directed towards the reflecting part of the light deflection device without being lost. It should be understood that all combinations of the above components and inventions shown in the process, device, system, etc., are actually practiced as an aspect of the present invention. [0014] According to the present invention, it is possible to provide a lamp unit capable of obtaining a desired light distribution.
    [0002] The invention will be well understood and its advantages will be better understood on reading the detailed description which follows. The description refers to the drawings given below, which are given by way of example. Figure 1 is a side view schematically showing a structure of a lamp unit according to the present embodiment. FIG. 2A is a front view showing a schematic configuration of a light deflection device according to a reference example, and FIG. 2B is a sectional view through line AA of the light deflection device shown in FIG. 2A. Fig. 3 is a side view schematically showing the scattering of reflected light when the light emitted by a light source is reflected in a first reflection position and a second reflection position by a mirror element. Fig. 4 is a schematic view for showing the pivot axis of a mirror element according to the present embodiment. Fig. 5 is a front view showing a schematic configuration of a lamp unit according to a comparative example. Fig. 6 is a top view schematically showing the scattering of light reflected in the lamp unit shown in Fig. 5. Fig. 7 is a schematic view showing an example of irradiation pattern by the lamp unit. according to the comparative example. Fig. 8 is a front view showing a schematic configuration of the lamp unit according to the present embodiment. Fig. 9 is a top view schematically showing the scattering of light reflected in the lamp unit shown in Fig. 8. Fig. 10 is a schematic view showing an example of irradiation pattern by the lamp unit. according to the present embodiment.
    [0003] DETAILED DESCRIPTION [0016] A preferred embodiment of the present invention will be described hereinafter with reference to the drawings. Identical or similar elements, members and processes shown in each of the drawings are represented by like or similar reference numerals and the repetition of their description will be omitted as appropriate. In addition, the embodiment is explanatory and is not intended to limit the present invention. It will be appreciated that all the features and combinations thereof described in the embodiment are not necessarily considered an essential part of the present invention. [0017] [Lamp unit] Fig. 1 is a side view schematically showing a structure of a lamp unit according to the present embodiment. A lamp unit 10 according to the present embodiment comprises a projection optical system 12, a light deflection device 100 disposed on the optical axis Ax of the projection optical system 12 and configured to selectively reflect the incident light. on the projection optical system 12, and an irradiation optical system 16 configured to irradiate light to a reflecting portion 100a of the light deflection device 100. The projection optical system 12 includes a projection lens 18. The system The irradiation optics 16 comprises a light source 20, a light concentration element 22 and a reflector 24. The lamp unit 10 according to the present embodiment is mainly used in a vehicle lamp (for example, a vehicle headlight). The use of the present invention is not however limited thereto, but the present invention can also be applied to lamps of various lighting devices and various moving objects (aircraft or railway vehicles, etc.). As a light source 20, a semiconductor light emitting element such as an LED (light emitting diode), a DL (laser diode), an EL (electroluminescence) element, a light bulb, a lamp incandescent (halogen lamp) and a discharge lamp or the like may be used. The light concentrating element 22 is configured to direct most of the light emitted by the light source 20 to a reflective surface 24a of the reflector 24. As a light concentration element 22, a convex lens, a solid bullet-shaped light guide, or a reflecting mirror whose inner surface is formed as a predetermined reflecting surface, or the like, may for example be used. More specifically, a compound parabolic concentrator can be used. On the other hand, the light concentration element can be omitted when most of the light emitted by the light source 20 can be directed towards the reflective surface 24a of the reflector 24. The light source 20 is mounted for example in a desired position of a heat sink made of metal, ceramic or the like. The light deflection device 100 is arranged on the optical axis Ax of the projection optical system 12 and configured to selectively reflect the light emitted by the light source 20 towards the projection optical system 12. for example, the light deflection device 100 may comprise a MEMS (electromechanical microsystem) or a DMD (matrix of micromirrors) in which a plurality of micromirrors is arranged in the form of a network (matrix).
    [0004] By separately controlling the angle of the reflecting surfaces of these micromirrors, the direction of reflection of the light emitted by the light source 20 can be selectively changed. That is, some of the light emitted by the light source 20 is reflected back to the projection optical system 12 and the other light can be reflected in a direction in which the light is not reflected. actually used. The direction in which the light is not actually used can here be considered as the direction in which the influence of the reflected light is small (eg, the reflected light hardly contributes to the formation of the pattern of distribution of light. desired light) or a direction in which the light is directed towards a light absorbing element (light-masking element) for example. [0020] The micromirror matrix (described later) of the light deflection device 100 is arranged in the vicinity of the focal point of the projection lens 18. The projection optical system 12 may include a plurality of microparticles. optical elements such as a lens. In addition, the optical element included in the projection optical system is not limited to the lens, but may be a reflective element. The irradiation optical system 16 according to the present embodiment comprises the reflector 24 for reflecting the light emitted by the light source 20 towards the light deflection device 100. The reflector 24 is configured so that the reflected light is focused on the reflecting portion 100a of the light deflection device 100.
    [0005] In this way, the light emitted by the light source 20 can be directed to the reflecting portion 100a of the light deflection device 100 without being lost. In addition, the reflective surface 24a of the reflector 24 has a greater surface area than that of the reflecting part 100a of the light deflection device 100. It is thus possible to reduce the dimensions of the light deflection device 100. Further, the light source 20 of the irradiation optical system 16 according to the present embodiment comprises a semiconductor light emitting element and this system comprises the compound parabolic type light concentration element 22 configured to focus the light emitted by the light source 20. In this way, the light emitted by the light source 20 can be directed to the reflecting portion 100a of the light deflector 100 without being lost. The lamp unit 10 configured as described above can be used in a variable light distribution headlight to implement a partial ignition / extinguishing. [0024] [Light deflection device] Fig. 2A is a front view showing a schematic configuration of a light deflection device according to a reference example, and Fig. 2B is a sectional view through the line AA of the light deflection device shown in FIG. 2A. As shown in FIG. 2A, the light deflection device 100 according to the reference example comprises a matrix of micromirrors 104 where a plurality of micromirror elements 102 is arranged in matrix form and an element The cover member is made of, for example, glass or material, a transparent cover 106 disposed on the front face (on the right side of the light deflection device 100 shown in FIG. 2B) of the reflecting surfaces 102a of the mirror elements 102. plastic or the like. Each mirror element 102 of the micromirror array 104 is configured such that a first reflection position P1 (solid position shown in FIG. 2B) in which the light emitted by the light source is reflected towards the projection optical system so as to be effectively used as part of a desired light distribution pattern, and a second reflection position P2 (dotted position shown in Fig. 2B) in which the light emitted by the light source is reflected so as not to be effectively used, can be swapped. FIG. 3 is a view schematically showing the scattering of the reflected light when the light emitted by the light source is reflected in the first reflection position and the second reflection position by the mirror elements. On the other hand, in Figure 3, the micromirror array is shown being replaced by a single mirror element to simplify the explanation. In addition, the light concentrating element 22 shown in FIG. 1 is not shown in FIG. 3. As shown in FIG. 3, since the light emitted by the light source 20 is concentrated and reflected by the reflector 24, the incident light Lin does not become a completely parallel light. That is, the incident light Lin has an angle of incidence to diffuse to some extent when it is incident on the reflecting surfaces 102a of the mirror elements 102. In addition, the mirror elements 102 are arranged to so that the reflected light Ri is mainly directed towards the projection lens 18 when the incident light Lin is reflected in the first reflection position P1. In addition, as shown in FIG. 3, the mirror elements 102 are arranged so that the reflected light R2 is not directed to the projection lens 18 when the incident light Lin is reflected in the second reflection position P2. In addition, the reflection position of each mirror element 102 is controlled and thus, the direction of reflection of the light emitted by the light source 20 is selectively changed. In this way, it is possible to obtain a projection image, a reflection image or a desired light distribution pattern. More specifically, the light deflection device 100 according to the present embodiment is configured so that, at least in certain mirror elements 102 of the reflecting part 100a, the first reflection position P1 where the light irradiated by the optical irradiation system 16 is reflected to the projection optical system 12 so as to be effectively used as part of a desired light distribution pattern and the second reflection position P2 in which the light irradiated by the system 20 radiation optics 16 is reflected so as not to be effectively used, can be switched. [0030] FIG. 4 is a schematic view intended to represent the axis of pivoting of the mirror element 102 according to the present embodiment. Mirror element 102 has a quadrangular reflective surface (e.g., square, diamond, rectangular, and parallelogram) 102a. Each mirror element 102 is configured such that the first reflection position P1 and the second reflection position P2 can be rotated about a pivot axis C1 along a diagonal line of the quadrangular reflective surface 102a. In this way it is possible to quickly and accurately form a pattern of light distribution of various shapes. However, when the pivot axis C1 of the mirror element 102 35 extends along the diagonal line of the quadrangular reflective surface and the light deflection device 100 in which these mirror elements 302 959 7 11 102 are arranged in matrix form, the following phenomenon can occur. FIG. 5 is a front view showing a schematic configuration of a lamp unit 110 according to a comparative example. On the other hand, the light deflection device 100 is arranged so that two adjacent sides of each mirror element 102 extend in the Z direction (vertical direction) and the Y direction (horizontal direction). FIG. 6 is a top view diagrammatically showing the scattering of the light reflected in the lamp unit shown in FIG. 5. On the other hand, for the convenience of representation, FIG. 6 represents the scattering of the reflected light. in a mirror element. As shown in FIG. 6, the lamp unit 110 according to the comparative example is arranged such that the light source 20 or the reflector 24 is symmetrical with respect to the XZ plane. That is, the light that is emitted by the light source 20 and scattered, is focused towards the optical axis Ax by the reflector 24. Accordingly, in the case where the light deflection device 100 is arranged so that the direction towards which the front face of the light deflection device 100 is turned corresponds to the optical axis Ax, the mirror element 102 is configured so that the majority of the reflected light R1 'is directed to the right-hand region of the projection lens 18 shown in Fig. 6 when the incident light Lin is reflected in the reflection position P1 '. On the other hand, the mirror element 102 is configured so that the majority of the reflected light R2 'is directed to the left region of the projection lens 18 shown in Fig. 6 when the incident light Lin is reflected in a reflection position P2 '. In this case, the mirror element 102 is configured so that the reflected light is incident on the projection lens both in the reflection position Pl 'and in the reflection position P2'. It is therefore not possible to obtain a desired light distribution pattern (irradiation pattern). For this reason, in the lamp unit 110, it is necessary to set, as the reference position, the position in which all the mirror elements 102 (light deflection device 100 ) is rotated (clockwise as shown in Figure 6) approximately 10 ° to 15 ° around the Z axis, for example. In doing so, most of the reflected light R1 'is incident on the projection lens 18 and most of the reflected light R2' is not incident on the projection lens 18. However, on the other hand, the light emitted by the light source 20 is, as a rectangular light source image, obliquely incident on and reflected by the mirror elements 102 in the reflection position Pi '. As a result, the image of the light source is rotated and projected forwardly by the projection lens 18. FIG. 7 is a schematic view showing an exemplary pattern of light. irradiation by the lamp unit 110 according to the comparative example.
    [0006] As shown in FIG. 7, an irradiation pattern PH 'is inclined obliquely as a whole. Thus, one can not obtain a desired light distribution pattern. As a result, the present inventors have intensively reflected and discovered that the above problems could be solved by shifting the position of the irradiation optical system 16 with respect to a vertical plane including the optical axis Ax. Fig. 8 is a front view showing a schematic configuration of the lamp unit 10 according to the present embodiment. Fig. 9 is a top view schematically showing the scattering of light reflected in the lamp unit 10 shown in Fig. 8. Fig. 10 is a schematic view showing an example of the irradiation pattern by the unit of light. lamp 10 according to the present embodiment. As shown in FIG. 8 or FIG. 9, the irradiation optical system 16 according to the present embodiment is arranged to irradiate the mirror elements 102 in the reflecting part of the light deflection device 100 since. the position shifted towards the side towards which the front face of the mirror element 102 is turned in the first reflection position P1 (right side of the optical axis Ax 302 959 7 13 shown in FIG. 9), with reference to a vertical plane S (XZ plane) including the optical axis Ax of the projection optical system 12. [0038] The irradiation optical system 16 of the lamp unit 10 thus configured is arranged to irradiate the reflecting part 100a of the light deflection device 100 from the position shifted towards the side towards which the front face of the reflecting part 100a is turned in the first reflection position Pi, rather than the side to which the front face of the reflecting portion 100a is turned in the second reflection position P2. Consequently, the angle of incidence or the angle of reflection of the light of the optical irradiation system 16 in the first reflection position P1 becomes smaller than the angle of incidence or the angle of reflection of the light of the optical irradiation system in the second reflection position P2. Accordingly, the implantation of the irradiation optical system 16 and the projection optical system 12 can be carried out so as to be compact. In addition, since the angle of incidence and the angle of reflection with respect to the mirror elements 102 located in the first reflection position P1 are small, the reflected light, which is not incident on the projection optical system 12 20 is reduced. That is, the light of the irradiation optical system 16 can be used in the light distribution pattern without being lost. The irradiation optical system 16 is disposed at a location which has been rotated about the optical axis Ax at an angle of α ° (0 <as 45) to the nearest side of the front face of the reflecting part 100a of the light deflection device 100 in the first reflection position P1, with reference to the vertical plane S including the optical axis Ax of the projection optical system 12. On the other hand, although the The angle of rotation a may vary variably depending on the adjustment of the pivot angle (angular displacement between the first reflection position and the second reflection position about the pivot axis C1 as a center of rotation. rotation) of the mirror element 102, the angle of rotation is preferably greater than or equal to 5 ° and is also preferably less than or equal to 40 °. As shown in FIG. 10, the lamp unit 10 thus configured makes it possible to obtain the irradiation pattern PH close to the rectangle. Specifically, the complete optical irradiation system 16 is rotated by assuming that a light source image is rotated when it is reflected by the deflection device. 100 light. It is thus easy to obtain a desired light distribution pattern. In addition, the entire structure is rotated while maintaining a relative arrangement relationship between the light source 20 and the reflector 24. In this way, the reflected image reaches the 100 light deviation without being modified when the image of the light source is reflected by the reflector 24. As a result, the optical design becomes easy. The compactness of the overall layout of the lamp and the amount of reflected light incident on the projection optical system 12 can thus be compatible at a high level, while achieving a desired light distribution pattern. The present invention has been described above with reference to each explanatory embodiment described above. However, the present invention is not limited to these explanatory embodiments.
    [0007] A suitable combination or replacement of the configuration of each illustrative embodiment is also intended to be included in the present invention. Furthermore, based on the general knowledge of those skilled in the art, the combination of the processing order in each explanatory embodiment may be suitably modified or various design modifications may be added to each explanatory embodiment. An explanatory embodiment to which such a modification is added may also be included within the scope of the present invention.
    权利要求:
    Claims (6)
    [0001]
    REVENDICATIONS1. A lamp unit (10) comprising: a projection optical system (12); a light deflecting device (100) having a reflecting portion (100a), the light deflecting device (100) being disposed on the optical axis of the projection optical system (12) and configured to selectively reflect the light incident to the projection optical system (12); and an irradiation optical system (16) configured to irradiate light to the reflecting portion (100a) of the light deflection device (100), characterized in that the light deflection device (100) comprises at least some region in the reflecting part (100a), the position of which can be switched between a first reflection position (P1) in which the light irradiated by the irradiation optical system (16) is reflected towards the projection optical system (12) so as to be effectively used as part of a desired light distribution pattern, and a second reflection position (P2) in which the light irradiated by the irradiation optical system (16) is reflected so as not to not be effectively used, and wherein the optical irradiation system (16) is disposed in a position shifted towards a side facing the front face of the reflecting portion issante (100a) in the first reflection position (P1), with reference to a vertical plane including the optical axis of the projection optical system (12).
    [0002]
    The lamp unit (10) according to claim 1, wherein the light deflection device (100) comprises a micromirror array (104) having a plurality of mirror elements, each mirror element having a reflective surface (24a). , in which the position of each mirror element can be swapped between the first reflection position (P1) and the second reflection position (P2) about a pivot axis, and wherein the pivot axis extends between along the diagonal line of the reflecting surface (24a) of the mirror element.
    [0003]
    The lamp unit (10) according to claim 1 or 2, wherein the irradiation optical system (16) is disposed at a location having a rotation about the axis. optical in a range from 5 ° to 45 ° to a side closer to the front face of the reflecting part (100a) in the first reflection position (P1), with reference to the vertical plane including the optical axis of the optical system of projection (12).
    [0004]
    The lamp unit (10) according to any one of claims 1 to 3, wherein the irradiation optical system (16) comprises a reflector (24) configured to reflect light emitted from a light source (20) to the light deflection device (100), and wherein the reflector (24) is configured to focus the light reflected on the reflecting portion (100a) of the light deflection device (100).
    [0005]
    The lamp unit (10) according to claim 4, wherein the reflecting surface (24a) of the reflector (24) has a larger area than that of the reflecting portion (100a) of the light deflecting device (100). .
    [0006]
    The lamp unit (10) according to claim 4 or 5, wherein the light source (20) of the irradiation optical system (16) comprises a semiconductor light emitting element; and said system comprises a compound parabolic type light concentrating element (22) configured to concentrate the light emitted by the light source (20).
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    同族专利:
    公开号 | 公开日
    FR3029597B1|2020-10-09|
    US9822943B2|2017-11-21|
    DE102015223873A1|2016-06-09|
    JP2016110760A|2016-06-20|
    JP6517008B2|2019-05-22|
    US20160161074A1|2016-06-09|
    CN105674181B|2018-11-20|
    CN105674181A|2016-06-15|
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    法律状态:
    2016-11-14| PLFP| Fee payment|Year of fee payment: 2 |
    2017-10-27| PLFP| Fee payment|Year of fee payment: 3 |
    2018-05-04| PLSC| Publication of the preliminary search report|Effective date: 20180504 |
    2018-10-29| PLFP| Fee payment|Year of fee payment: 4 |
    2019-10-31| PLFP| Fee payment|Year of fee payment: 5 |
    2020-10-29| PLFP| Fee payment|Year of fee payment: 6 |
    2021-11-09| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2014245291A|JP6517008B2|2014-12-03|2014-12-03|Lighting unit|
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