Projection vehicle lamp

Abstract

The utility model discloses a projection car lamp which comprises a heat dissipation body, a light source arranged on the heat dissipation body and used for emitting parallel light or nearly parallel light, a cambered surface reflecting mirror array, a digital micro reflecting mirror and an imaging lens group, wherein the cambered surface reflecting mirror array, the digital micro reflecting mirror and the imaging lens group are sequentially arranged along a light emitting path of light rays of the light source. The cambered surface reflector array is composed of a plurality of cambered surface reflector units, and connecting lines of vertexes of the cambered surface reflector units form a free-form surface. The digital micro reflector is located on a focal plane of the imaging lens group. The parallel light or the near-parallel light is projected to the digital micro-reflector after being reflected by the cambered surface reflector array, the micro-reflector is located on a central optical axis of the imaging lens group, and the parallel light or the near-parallel light is projected to the digital micro-reflector after being reflected by any cambered surface reflector unit and is overlapped with light spots on the digital micro-reflector. The projection vehicle lamp has the advantages of being high in brightness and high in definition quality and low in cost.

Description

Technical Field

[0001] This utility model relates to the field of vehicle lighting technology, and more specifically, to a projection vehicle light. Background Technology

[0002] Traditional automotive headlights perform poorly in dark nights, inclement weather, and complex road conditions, failing to meet the demands for intelligent driving. Digital projection intelligent headlights, with their high pixel resolution and adaptive adjustment, are increasingly being adopted in automobiles. They enhance driving safety and meet the intelligent needs of drivers, considered a mainstream trend for future headlights. Compared to ordinary headlights, digital projection intelligent headlights not only create more ideal lighting conditions in dark nights but also expand the visual support of driver assistance systems and minimize the risk of glare for oncoming drivers, thus helping drivers respond flexibly to various road conditions. Simultaneously, digital projection intelligent headlights can project road signs, effectively enabling human-vehicle information interaction and improving driving safety. Currently, conventional projection headlights use multiple LED emitters, each superimposed onto a DMD chip via multiple independent optical elements. The LED emitter is an LED chip coated with a phosphor layer; the phosphor layer on the LED chip is imaged onto the DMD chip, and then projected or illuminated through an imaging lens. Because phosphors are granular powders, the graininess in the image is quite noticeable, significantly impacting projection quality. Furthermore, due to limitations in the powder spraying process, the phosphor layer is prone to unevenness. Additionally, dirt or foreign matter on the phosphor layer will be imaged onto the DMD chip, resulting in a less than ideal projection effect. Utility Model Content

[0003] The present invention aims to overcome at least one of the defects of the prior art and provide a new projection vehicle light, which has the advantages of high brightness, high definition quality and low cost.

[0004] The technical solution adopted by this utility model is as follows:

[0005] A projection vehicle light includes a heat sink, a light source disposed on the heat sink for emitting parallel or near-parallel light, an array of curved reflectors, a digital micro-reflector, and an imaging lens group arranged sequentially along the light path of the light source. The array of curved reflectors is composed of a plurality of curved reflector units, and the lines connecting the vertices of the plurality of curved reflector units form a freeform surface. The digital micro-reflector is located on the focal plane of the imaging lens group. The parallel or near-parallel light is reflected by the array of curved reflectors and then projected onto the digital micro-reflector. The micro-reflector is located on the central optical axis of the imaging lens group. The light spots of the parallel or near-parallel light projected onto the digital micro-reflector after being reflected by any of the curved reflector units overlap.

[0006] In one embodiment, the area S of the curved reflector unit satisfies: 25 ≤ S ≤ 250 mm 2 .

[0007] In one embodiment, the number of the curved reflector units is 4 to 40.

[0008] In one embodiment, the projection of the curved reflector unit onto a plane perpendicular to the direction of the parallel or near-parallel light is rectangular.

[0009] In one embodiment, the light source and the arc-shaped reflector array are located on the same side of the central optical axis, and the convex surface of the freeform surface faces away from the light source.

[0010] In one embodiment, the light source includes an LED emitter and a reflector, with the LED emitter located at the focal point of the reflector.

[0011] In one embodiment, the light source includes an LED emitter and a lens assembly, wherein the LED emitter is located at the combined focal point of the lens assembly.

[0012] In one embodiment, the light source includes an LED emitter and a TIR lens, with the LED emitter positioned at the optical center of the TIR lens.

[0013] In one embodiment, the projection vehicle light further includes a housing, with a light outlet on one side of the housing, and the imaging lens assembly is mounted at the light outlet.

[0014] In one embodiment, the housing is provided with a cooling fan and a cover plate with perforations on the side opposite to the light outlet.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This technical solution designs an arc-shaped reflector array so that parallel or near-parallel light emitted by the light source can be reflected by the arc-shaped reflector array and projected onto the digital micro-reflector. Furthermore, the light spots projected onto the digital micro-reflector after being reflected by any of the arc-shaped reflector units are all superimposed. Thus, the parallel or near-parallel light emitted by the light source can be superimposed and uniformly distributed on the digital micro-reflector, significantly improving the uniformity of the light spot. This avoids image clarity problems caused by uneven phosphor layer or dirt or foreign matter on the phosphor layer, thereby improving the quality of the vehicle headlight projection image. Attached Figure Description

[0016] Figure 1 This is an exploded view of the projected vehicle headlights in Example 1.

[0017] Figure 2 This is a simplified schematic diagram of the optical paths of two light rays in the projection vehicle light of Example 1.

[0018] Figure 3 for Figure 2 A schematic diagram of a curved reflector array.

[0019] Figure 4 This is a simplified structural diagram of the projection vehicle light in Example 2.

[0020] Figure 5 This is a simplified structural diagram of the projection vehicle light in Example 3.

[0021] Explanation of reference numerals in the attached drawings: 1. Heat sink; 11. Heat sink substrate; 12. Heat sink; 2. Light source; 21. LED light emitter; 22. Reflector cup; 23. Lens group; 24. TIR lens; 3. Curved surface reflector array; 31. Curved surface reflector unit; 4. Digital micro-reflector; 5. Imaging lens group; 61. Upper housing; 62. Lower housing; 7. Cooling fan; 8. Cover plate; 9. Driver board. Detailed Implementation

[0022] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0023] Example 1

[0024] like Figure 1 , Figure 2 , Figure 3 As shown, this embodiment discloses a projection vehicle lamp, including a heat sink 1, a light source 2 disposed on the heat sink 1 for emitting parallel or near-parallel light, an arc-shaped reflector array 3, a digital micro-reflector 4, and an imaging lens group 5 arranged sequentially along the light emission path of the light source 2. The arc-shaped reflector array 3 is composed of a plurality of arc-shaped reflector units 31, and the line connecting the vertices of the plurality of arc-shaped reflector units 31 forms a free-form surface. The digital micro-reflector 4 is located on the focal plane of the imaging lens group 5. The parallel or near-parallel light is reflected by the arc-shaped reflector array 3 and then projected onto the digital micro-reflector 4. The micro-reflector 4 is located on the central optical axis of the imaging lens group 5. The light spots of the parallel or near-parallel light projected onto the digital micro-reflector 4 after being reflected by any of the arc-shaped reflector units 31 overlap.

[0025] In this embodiment, the light source 2 emits parallel or near-parallel light, which is reflected by the arc-shaped reflector array 3 and projected onto the digital micro-reflector 4. The arc-shaped reflector array 3 is composed of several arc-shaped reflector units 31. The light spots projected onto the digital micro-reflector 4 after being reflected by any of the arc-shaped reflector units 31 overlap, so the parallel or near-parallel light emitted by the light source 2 is divided into multiple segments by the arc-shaped reflector array and superimposed on the digital micro-reflector 4 to achieve uniformity of light spots. This significantly improves the uniformity of light spots and avoids image clarity problems caused by uneven phosphor layers or dirt or foreign matter on the phosphor layers, thereby improving the quality of the vehicle headlight projection image.

[0026] Furthermore, the arc-shaped reflector array 3 is designed as a single integral molding of several arc-shaped reflector units 31. This integral molding design can improve accuracy, reduce tolerance, and lower costs.

[0027] Furthermore, in this embodiment, the area S of the curved reflector unit 31 satisfies: 25 ≤ S ≤ 250 mm. 2 This design allows for a better fit with the size of digital micromirrors.

[0028] Furthermore, the number of the curved reflector units 31 is 4 to 40.

[0029] Furthermore, in this embodiment, the projection of the curved reflector unit 31 onto a plane perpendicular to the direction of the parallel or near-parallel light is rectangular. This design allows the light spot projected onto the digital micromirror 4 by the multiple curved reflector units 31 to better match the shape of the digital micromirror 4.

[0030] Furthermore, the light source 2 and the curved mirror array 3 are located on the same side of the central optical axis, and the convex surface of the freeform surface faces away from the light source. Since the convex surface of the freeform surface faces away from the light source, the curved mirror array 3 as a whole acts to converge the parallel or near-parallel light emitted by the light source 2, thereby splitting the parallel or near-parallel light and then superimposing it onto the digital micro-mirror 4.

[0031] Specifically, in this embodiment, the light source 2 includes an LED light emitter 21 and a reflector 22, with the LED light emitter 21 located at the focal point of the reflector 22.

[0032] Specifically, the projection vehicle light in this embodiment also includes a housing, which is composed of an upper housing 61 and a lower housing 62. A light outlet is provided on one side of the housing, and the imaging lens group 5 is installed at the light outlet.

[0033] Specifically, in this embodiment, a cooling fan 7 and a cover plate 8 with perforations are provided on the side of the housing opposite to the light outlet. The cooling fan 7 assists in heat dissipation, and the cover plate 8 can minimize the entry of dust into the headlight and make the headlight more aesthetically pleasing.

[0034] Specifically, in this embodiment, the scatterer 1 includes a heat dissipation substrate 1 and a heat sink 12 disposed on one side of the upper surface of the scattering substrate, and the heat sink is disposed close to the cooling fan 7.

[0035] Furthermore, in this embodiment, the projection vehicle light also includes a driver board 9, which is used to supply power to the digital micro-reflector 4, the LED light emitter 21 and / or the cooling fan 7.

[0036] Specifically, the digital micromirror 4 is a commercially available DMD digital micromirror array.

[0037] Example 2

[0038] like Figure 4 As shown, this embodiment discloses a projection vehicle light, including a heat sink, a light source disposed on the heat sink for emitting parallel or near-parallel light, an arc-shaped reflector array 3, a digital micro-reflector 4, and an imaging lens group 5 arranged sequentially along the light path of the light source. The arc-shaped reflector array 3 is composed of a plurality of arc-shaped reflector units, and the lines connecting the vertices of the plurality of arc-shaped reflector units form a free-form surface. The digital micro-reflector 4 is located on the focal plane of the imaging lens group 5. The parallel or near-parallel light is reflected by the arc-shaped reflector array 3 and then projected onto the digital micro-reflector 4. The micro-reflector 4 is located on the central optical axis of the imaging lens group 5. The light spots projected onto the digital micro-reflector 4 after being reflected by any of the arc-shaped reflector units overlap. The light source includes an LED light emitter 21 and a lens group 23, and the LED light emitter 21 is located at the combined focal point of the lens group 23.

[0039] The projection vehicle light described in this embodiment is largely the same as the projection vehicle light in Embodiment 1, except for the light source. In this Embodiment 2, the light source consists of an LED light emitter 21 and a lens group 23. The LED light emitter 21 is located at the combined focal point of the lens group 23. The lens group 23 can also effectively collect light from the LED light emitter 21 and obtain parallel or forward parallel light rays. Other structures and operating principles of this Embodiment 2 are the same as those of Embodiment 1, and will not be repeated here.

[0040] Example 3

[0041] like Figure 5As shown, this embodiment discloses a projection vehicle light, including a heat sink, a light source disposed on the heat sink for emitting parallel or near-parallel light, an array of curved reflectors 3, a digital micro-reflector 4, and an imaging lens group 5 arranged sequentially along the light path of the light source. The array of curved reflectors 3 is composed of a plurality of curved reflector units, and the lines connecting the vertices of the plurality of curved reflector units form a free-form surface. The digital micro-reflector 4 is located on the focal plane of the imaging lens group 5. The parallel or near-parallel light is reflected by the array of curved reflectors 3 and then projected onto the digital micro-reflector 4. The micro-reflector 4 is located on the central optical axis of the imaging lens group 5. The light spots of the parallel or near-parallel light projected onto the digital micro-reflector 4 after being reflected by any of the curved reflector units overlap. The light source includes an LED emitter 21 and a TIR lens 24, and the LED emitter 21 is disposed at the optical center of the TIR lens 24.

[0042] The projection vehicle light described in this embodiment is largely the same as the projection vehicle light in Embodiment 1, the only difference being the light source. In this Embodiment 3, the light source consists of an LED emitter 21 and a TIR lens 24. The LED emitter 21 is positioned at the optical center of the TIR lens 24. The TIR lens 24 can effectively collect light from the LED emitter and obtain parallel or near-parallel light rays, and the TIR lens has higher light collection efficiency. Other structures and operating principles in Embodiment 3 are the same as in Embodiment 1, and will not be repeated here.

[0043] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A projection vehicle light, characterized in that, The system includes a heat sink, a light source mounted on the heat sink for emitting parallel or near-parallel light, an array of curved mirrors, a digital micromirror, and an imaging lens group arranged sequentially along the light path of the light source. The array of curved mirrors is composed of several curved mirror units, and the lines connecting the vertices of the curved mirror units form a freeform surface. The digital micromirror is located on the focal plane of the imaging lens group. The parallel or near-parallel light is reflected by the array of curved mirrors and then projected onto the digital micromirror. The micromirror is located on the central optical axis of the imaging lens group. The light spots of the parallel or near-parallel light projected onto the digital micromirror after being reflected by any of the curved mirror units overlap.

2. The projection vehicle light according to claim 1, characterized in that, The area S of the curved reflector unit satisfies: 25 ≤ S ≤ 250 mm 2 .

3. The projection vehicle light according to claim 2, characterized in that, The number of the curved reflector units is 4 to 40.

4. The projection vehicle light according to claim 1, characterized in that, The projection of the curved reflector unit onto a plane perpendicular to the direction of the parallel or near-parallel light is rectangular.

5. The projection vehicle light according to claim 1, characterized in that, The light source and the arc-shaped reflector array are located on the same side of the central optical axis, and the convex surface of the freeform surface faces away from the light source.

6. The projection vehicle light according to claim 1, characterized in that, The light source includes an LED emitter and a reflector, with the LED emitter located at the focal point of the reflector.

7. The projection vehicle light according to claim 1, characterized in that, The light source includes an LED emitter and a lens assembly, with the LED emitter located at the combined focal point of the lens assembly.

8. The projection vehicle light according to claim 1, characterized in that, The light source includes an LED emitter and a TIR lens, with the LED emitter positioned at the optical center of the TIR lens.

9. The projection vehicle light according to any one of claims 1 to 8, characterized in that, The projection headlight also includes a housing, with a light outlet on one side of the housing, and the imaging lens assembly is mounted at the light outlet.

10. The projection vehicle light according to claim 9, characterized in that, The housing is equipped with a cooling fan and a cover plate with perforations on the other side opposite to the light outlet.

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