CN218032963U

CN218032963U - Optical assembly, lighting device and vehicle

Info

Publication number: CN218032963U
Application number: CN202220309451.3U
Authority: CN
Inventors: 张娴; 陈琛; 侯保营; 胡银朋
Original assignee: Valeo Ichikoh China Auto Lighting Co Ltd
Current assignee: Valeo Ichikoh China Auto Lighting Co Ltd
Priority date: 2021-12-23
Filing date: 2022-02-15
Publication date: 2022-12-13
Anticipated expiration: 2032-02-15
Also published as: CN116336415A; CN218863992U; CN117190122A

Abstract

The utility model relates to an optical assembly, include: a light source; the light guide unit is approximately plate-shaped, and the light source enters from at least one end face of the light guide unit and exits from a light-emitting face of the light guide unit. The utility model discloses a light source cooperation leaded light unit is in order to realize the luminous effect of face, for OLED scheme among the prior art, can greatly reduce cost. The utility model discloses still relate to a lighting device and vehicle.

Description

Optical assembly, lighting device and vehicle

Technical Field

The utility model relates to a car light technical field, concretely relates to optical assembly, lighting device and vehicle.

Background

Lighting devices are used to provide light for lighting and/or optical indicating functions, and are widely used in various fields, for example, in motor vehicles to secure safe driving using a lighting device such as a lamp. Various types of lamps are often required on motor vehicles to perform different functions, including automotive headlamps, daytime running lamps, position lamps, turn signals, brake lamps, backup lamps, side marker lamps, and the like.

In some cases, the host manufacturer may want the lamp to have a uniform surface lighting effect due to the design of the lamp, and the prior art generally uses an OLED (Organic Light-Emitting Diode), which is expensive.

SUMMERY OF THE UTILITY MODEL

Therefore, it is an object of the present invention to provide an optical assembly, a lighting device and a vehicle for realizing a light function, which are capable of at least partially solving the above mentioned problems.

According to an aspect of the present invention, there is provided an optical assembly, the optical assembly including: a light source; and the light guide unit is approximately plate-shaped, and light rays from the light source enter from at least one end face of the light guide unit and are emitted from a light emitting surface of the light guide unit.

In some embodiments, the optical assembly further includes a back plate assembly disposed on a side of the light guide unit opposite to the light exit surface.

In some embodiments, the back plate assembly is configured to reflect the light from the light guide unit toward the light exit surface.

According to the utility model discloses an embodiment sets up the light that backplate subassembly spilled with reflection leaded light unit through the dorsal part at leaded light unit, is favorable to improving optical efficiency and luminous effect's homogeneity.

In some embodiments, the back plate assembly includes a back plate configured to reflect the light from the light guide unit toward the light exit surface.

In some embodiments, the back plate assembly includes a back plate configured to support the reflective layer and a reflective layer disposed between the back plate and the light guide unit and configured to reflect light from the light guide unit toward the light exit surface.

In some embodiments, light from the light source is incident from a plurality of end faces of the light guide unit.

In some embodiments, the light guide unit includes scattering particles inside, the scattering particles configured to scatter light from the light source. The light guide unit with the scattering particles has good light diffusion characteristics, and can realize very uniform light lightening effect.

In some embodiments, a surface of the light guiding unit opposite the light exit surface includes an optical decoupling element configured to cause light rays from the light source to exit the light exit surface.

In some embodiments, the optical decoupling elements comprise one or more of serrations, stripes, dermatoglyphs, squares, bumps, recesses.

In some embodiments, a surface of the light guide unit opposite to the light exit surface is at least partially inclined toward the light exit surface to reflect the light from the light source toward the light exit surface.

In some embodiments, a surface of the light guide unit opposite to the light exit surface includes a plurality of total reflection facets configured to totally reflect the light from the light source toward the light exit surface.

In some embodiments, the light guide unit has a gradually decreasing thickness in the light entrance direction. Preferably, a ratio of the maximum thickness to the minimum thickness of the light guide unit is greater than 1 and less than or equal to 3.125. Make the light guide unit have the thickness that reduces gradually, can reduce the loss of light in less thickness department, so whole loss tends to unanimity to make the light guide unit have comparatively even face luminous effect.

In some embodiments, the optical assembly further includes a transparent front plate disposed on the same side as the light emitting surface of the light guide unit and configured to transmit light from the light emitting surface. The transparent front plate can play a role in protecting the light guide unit, and the light guide unit can be prevented from being damaged and scratched.

In some embodiments, the optical assembly further comprises a scattering layer disposed between the light guide unit and the transparent front plate to scatter light from the light guide unit.

In some embodiments, some or all of the color of the back plate assembly is white.

In some embodiments, the light guide unit is red or pink in color.

In some embodiments, the height of the light guide unit is less than or equal to 30mm in the case where the light guide unit is red in color, and less than or equal to 50mm in the case where the light guide unit is pink in color.

In some embodiments, the light guide unit is red or pink in color.

In some embodiments, the light guide unit is pink in color and some or all of the back plate assembly is red in color.

In some embodiments, the light guide unit is a colorless transparent light guide.

In some embodiments, some or all of the color of the back plate assembly is red or pink.

In some embodiments, where some or all of the color of the back plate assembly is red, the height of the light guide unit is less than or equal to 45mm.

In some embodiments, the transparent front panel is red or pink in color and some or all of the back panel assembly is white or red or pink in color.

In some embodiments, in the case where the color of the transparent front plate is red and the color of part or all of the back plate assembly is white, the height of the light guide unit is less than or equal to 55mm.

In some embodiments, the backplane assembly is further configured to form a holder for the optical assembly, the holder being configured to hold the light guide unit.

In some embodiments, the holder at least partially encloses a circumferential outer edge of the light guide unit, so that undesired light leakage at the circumferential outer edge of the light guide unit can be prevented.

In some embodiments, the holder further comprises a frame mounted to the backplane assembly, the light guide unit being sandwiched between the frame and the backplane assembly.

In some embodiments, the optical assembly further includes a transparent front plate disposed on the same side of the light emitting surface of the light guide unit and configured to transmit light from the light emitting surface, and the transparent front plate and the frame are integrally formed, so that the process can be simplified and the overall thickness of the light guide unit can be reduced.

In some embodiments, the optical assembly further comprises a printed circuit board, the holder further configured to hold the printed circuit board.

According to another aspect of the present invention, there is also provided a lighting device, comprising any one of the optical assemblies described above.

According to still another aspect of the present invention, there is provided a vehicle including the above lighting device.

Drawings

The above features, technical characteristics, advantages and modes of realisation of the present invention will be further explained in the following more particular description of preferred embodiments thereof, given in conjunction with the accompanying drawings, in which,

fig. 1 shows a front view of a lighting device 1 according to an embodiment of the invention;

fig. 2 shows a side view of the lighting device 1 of fig. 1;

fig. 3 shows a rear view of the lighting device 1 of fig. 1;

fig. 4 showsbase:Sub>A cross-sectional view andbase:Sub>A schematic light path of the optical assembly 10 according to the first embodiment of the present invention along the linebase:Sub>A-base:Sub>A in fig. 1;

fig. 5 shows an exploded schematic view of the lighting device 1 comprising the optical assembly 10 of fig. 4;

fig. 6 showsbase:Sub>A cross-sectional view andbase:Sub>A schematic light path of an optical assembly 10 according tobase:Sub>A second embodiment of the invention along the linebase:Sub>A-base:Sub>A in fig. 1;

fig. 7 shows an exploded schematic view of the lighting device 1 comprising the optical assembly 10 of fig. 6;

fig. 8 showsbase:Sub>A cross-sectional view of the light guide unit 200 along the linebase:Sub>A-base:Sub>A in fig. 1 andbase:Sub>A schematic diagram of an optical path.

Detailed Description

Embodiments of the present invention are exemplarily described below. As those skilled in the art will appreciate, the illustrated embodiments may be modified in various different ways without departing from the inventive concept. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive. In the following, the same reference numbers generally indicate functionally identical or similar elements.

Fig. 1 shows a front view of a lighting device 1 according to an embodiment of the invention, fig. 2 shows a side view of the lighting device 1 of fig. 1, and fig. 3 shows a rear view of the lighting device 1 of fig. 1. The lighting device 1 according to the embodiment of the present invention is used for a specific light function, and herein, the light function is not particularly limited, and examples thereof may include, but are not limited to, a vehicle headlamp, a daytime running light, a position light, a turn light, a brake light, a backup light, a side marker light, a logo light, and the like. As shown, the lighting device 1 comprises two optical assemblies 10 with surface-emitting effect, each optical assembly 10 is used to realize the specific light function, and they can be arranged in a staggered manner to realize a specific shape, although it is understood that the lighting device 1 can comprise any number of optical assemblies 10, and the optical assemblies 10 can be arranged in any manner according to the shape requirement.

Example 1

Fig. 4 showsbase:Sub>A cross-sectional view andbase:Sub>A schematic light path of the optical assembly 10 according to the first embodiment of the invention along the linebase:Sub>A-base:Sub>A in fig. 1, and fig. 5 shows an exploded schematic view of the lighting device 1 comprising the optical assembly 10 in fig. 4. As shown, the optical assembly 10 according to the first embodiment of the present invention includes a printed circuit board 100 and a light guide unit 200, wherein the printed circuit board 100 is mounted with a light source 110 to emit light to the light guide unit 200, the light source 110 is, for example, but not limited to, an LED light source, and as a non-limiting example, two optical assemblies 10 in fig. 5 may share one printed circuit board 100. As shown, the light guide unit 200 has a substantially plate shape, and includes an end surface 210, and a front surface 220 and a rear surface 230 connected by the end surface 210, wherein light from the light source 110 is incident from the end surface 210 into the light guide unit 200 and propagates between the front surface 220 and the rear surface 230 of the light guide unit 200 toward opposite ends of the side end surface 210, during which the light exits from the front surface 220 of the light guide unit 200 along the main light exit direction H, that is, the front surface 220 serves as a light exit surface of the light guide unit 200, thereby achieving a surface light emission effect.

According to the utility model discloses an embodiment, through making light source 110 and leaded light unit 200 cooperate in order to realize the face luminescence effect, for the OLED scheme, can greatly reduce cost.

In addition, with the light guide unit 200, some light may also leak out of the rear surface 230 of the light guide unit 200 to lower the optical efficiency. Therefore, as shown in the figure, the optical module 10 further includes a back plate assembly 230 disposed on the same side of the light guide unit 200 as the rear surface 230, i.e., on the opposite side of the front surface 220, and configured to reflect light leaking from the rear surface 230 toward the front surface 220. The embodiment of the present invention provides a light guide unit 200, which can reflect the light leaked from the light guide unit 200 through the back plate assembly disposed on the back side of the light guide unit 200, thereby improving the uniformity of the optical efficiency and the light emitting effect. In some alternative examples, the back-plane assembly 230 is disposed on the same side of the light guide unit 200 as the back surface 230 and is configured to support the light guide unit 200 without providing a reflective function (e.g., without limitation, in a case where light rays of the light guide unit 200 do not leak out of the back surface 230).

In some examples, the back-plate assembly 230 includes only a back-plate configured to reflect light from the light guide unit 200 toward the light-emitting surface, for example, but not limited to, the back-plate may be selected to be a color and/or material capable of reflecting light, such as a white back-plate.

In an alternative example, the backplate assembly 230 includes a backplate and a reflective layer, wherein the backplate is configured to support the reflective layer and may be selected to be non-reflective in color and/or material; the reflective layer is disposed between the back plate and the light guide unit 200, and is configured to reflect light from the light guide unit 200 toward the light exit surface. In this case, the back plate and the reflective layer may be integrally formed, for example, but not limited to, by an injection molding process (secondary injection molding, in-mold injection molding, etc.) or a spray coating process, or both may be separately formed.

In some examples, in order to make the light exit from the front surface 220 of the light guide unit 200, the light guide unit 200 may include scattering particles inside, and the light from the light source 110 may be scattered toward different directions by the scattering particles, thereby breaking the total reflection condition of the light, so that the light exits from the front surface 220 of the light guide unit 200. The light guide unit with scattering particles has good light diffusion characteristics, and can realize very uniform light illumination effect. As a non-limiting example, a light guide unit of this type may be chosen, for example, from the material Polymethylmethacrylate (PMMA), such as the light guide under the designation LED 8N LD12, LD24, LD48, LD96, or from the material Polycarbonate (PC), such as the designation EL2245, the color of which may be chosen as desired, for example, but not limited to, colorless, pink, red, and the like.

In alternative examples, an optical decoupling element may be disposed on the rear surface 230 of the light guide unit 200 to disrupt the total reflection condition of the light, examples of which include, but are not limited to, protrusions, depressions, serrations, dermatoglyphs, stripes, squares, and the like.

In an alternative example, as shown in fig. 8, at least a portion of the rear surface 230 of the light guide unit 200 is inclined toward the front surface 220 of the light guide unit 200, and the light incident from the end surface 210 of the light guide unit 200 reaches the rear surface 230 to be reflected toward the front surface 220 to exit through the front surface 220. Preferably, the end surface 210 of the light guide unit 200 is provided with a collimator for collimating the light rays from the light source 110 to be incident substantially in parallel to the rear surface 230 of the light guide unit 200. Further, the rear surface 230 of the light guide unit 200 may include a plurality of total reflection facets configured to totally reflect light from the light source toward the front surface 220 of the light guide unit 200. This improves the uniformity of the lighting effect while improving the optical efficiency.

In some examples, as shown in fig. 4, the light guide unit 200 has a gradually decreasing thickness (thickness is a dimension of the light guide unit 200 in the main light emitting direction H) in the light entering direction E. Since the light from the light source 110 is gradually lost when propagating along the light incident direction E (e.g., due to light absorption, light leakage, etc. of the light guide unit 200), the light guide unit 200 has a gradually decreasing thickness in the light incident direction E, so that the loss of the light at a smaller thickness can be reduced, and thus the overall loss tends to be uniform, so that the light guide unit 200 has a more uniform surface light emitting effect. Preferably, the maximum thickness of the light guide unit 200 (i.e., the thickness at the end face 210) is greater than or equal to 2mm, and less than or equal to 5mm, and the minimum thickness (i.e., the thickness at the end face opposite to the end face 210) ranges from greater than or equal to 1.6mm, and less than 5mm, that is, the ratio of the maximum thickness to the minimum thickness of the light guide unit 200 is greater than 1 and less than or equal to 3.125.

It should be noted that although fig. 4 shows that the light source 210 enters light from only one end face of the light guide unit 200, it is understood that it may also enter light from two opposite end faces of the light guide unit 200 at the same time, and may even enter light from three end faces, four end faces or more end faces of the light guide unit 200 at the same time, and the printed circuit board 100 may include a plurality of light sources 210 disposed along the end faces of the light guide unit 200.

Further, regarding the fixation of the light guiding unit 200 in fig. 4, as shown in fig. 5, the back plate assembly 410 is also used to form a holding frame 400 of the optical assembly 10, the holding frame 400 being configured to hold the light guiding unit 200. The holder 400 further includes a frame body 420, and the frame body 420 may be assembled with the back plate assembly 410 to clamp the light guide unit 200 therebetween. Specifically, the light guide unit 200 and the frame body 420 may include a pre-positioning means for the light guide unit 200, for example, but not limited to, the light guide unit 200 includes a lug 240, and the frame body 420 includes a corresponding groove, wherein the lug 240 can be snapped into the groove to pre-fix the light guide unit 200, and after the frame body 420 and the backplane assembly 410 are assembled together, the light guide unit 200 can be firmly clamped in the middle. It is understood that the light guide unit 200 may be fixed to the holder 400 by any other means.

As shown in fig. 1 to 3, the circumferential edge of the frame body 420 at least partially encloses the circumferential outer edge of the light guide unit 200, whereby undesired light leakage at the circumferential outer edge of the light guide unit 200 can be prevented.

As shown in fig. 3 and 5, the back plate assembly 410 includes a body portion 411 and a bending portion 412, where the body portion 411 is used to be connected to the frame body 420 to clamp the light guiding unit 200, and specifically, the body portion 411 may be ultrasonically welded to the frame body 420, but may also be connected to the frame body 420 in any other suitable manner, such as, but not limited to, bolting. The bent portion 412 is used to fix the printed circuit board 100, for example, by one or more positioning posts 413 matching with the bolts, but the printed circuit board 100 may also be fixed by any other suitable method.

Example 2

Fig. 6 showsbase:Sub>A cross-sectional view andbase:Sub>A schematic light path of an optical assembly 10 according tobase:Sub>A second embodiment of the invention along the linebase:Sub>A-base:Sub>A in fig. 1, and fig. 7 shows an exploded schematic view ofbase:Sub>A lighting device 1 comprising the optical assembly 10 in fig. 6. The second embodiment is further optimized on the basis of the first embodiment described above, and therefore the contents described above with respect to the first embodiment are also applicable to the second embodiment. As shown in the drawing, the second embodiment is different from the first embodiment in that a transparent front plate 300 is added, the transparent front plate 300 being disposed at the front side of the light guide unit 200, i.e., the same side as the front surface 220, and configured to transmit light from the front surface 220. The transparent front plate 300 may function to protect the light guide unit 200, which can prevent the light guide unit 200 from being damaged and scratched.

In some examples, the optical assembly 10 further includes a diffusion layer disposed between the light guide unit 200 and the transparent front plate 300, and light from the light guide unit 200 is incident to the diffusion layer from a rear surface thereof and uniformly diffused by the diffusion layer, whereby uniformity of a lighting effect may be further improved. The scattering layer may be made of any suitable light-transmissive scattering material, such as, but not limited to, polymethyl methacrylate (PMMA), polycarbonate (PC), and the like. The diffusion layer may be integrally formed with the light guide unit 200 and/or the transparent front plate 300 or separately formed.

Further, in the present embodiment, the fixing of the light guide unit 200 and the printed circuit board 100 is the same as embodiment 1 shown in fig. 4 and 5, and thus the contents described above with respect to the first embodiment are also applicable to the second embodiment. In addition, it is preferable that the transparent front plate 300 is integrally formed with the frame body 420, for example, but not limited to, by a secondary injection molding process or the like, thereby simplifying the process and reducing the overall thickness of the optical assembly 10.

In the above description of the embodiments for improving the optical efficiency and the light emission uniformity of the light guide unit 200, further, the lighting devices 1 with different functions need to have their respective colors in the unlit state, for example, the rear position light, the stop light, and the backup light are substantially red in the unlit state, and the daytime running light and the turn signal light are substantially colorless and transparent or translucent in the unlit state. In the following, on the basis of the above-mentioned embodiments, how to realize uniform light emission of the lighting device 1 and a specific unlit color of the light function will be described. In the embodiment of the present invention, the unlit color of the light function of the lighting device 1, which emits red light by the light source 110, is substantially red, as an example, it can be understood that a person skilled in the art can substitute red color with other colors according to actual needs without any doubt.

Example 3

This embodiment is based on the optical module 10 in embodiment 1 shown in fig. 4 and 5, i.e., the optical module 10 has a two-layer structure of the back plate module 410 and the light guide unit 200. In this case, the color of the light function of the corresponding lighting device 1 in the unlit state is determined by at least the superposition of the color of the back plate assembly 410 and the color of the light guide unit 200.

In order to make the unlit color of the light function of the corresponding lighting device 1 substantially red, the back plate assembly 410, which is partially or wholly white, and the light guide unit 200, which is red, may be used. In addition, the red light guide unit 200 has a strong absorption effect on red light, and the inventor has found through research that, in the case of using the red light guide unit 200, the size (i.e., height) of the light guide unit 200 in the light incident direction E needs to be less than or equal to 30mm to achieve a uniform surface light emission effect.

Example 4

The present embodiment is different from embodiment 3 in that, in order to make the unlit color of the light function of the corresponding lighting device 1 substantially red, a back plate assembly 410, which is partially or entirely white in color, and a light guide unit 200, which is pink, may be used. In addition, the pink light guide unit 200 has a weaker absorption effect on red light than the red light guide unit 200, and the inventors have studied and found that, based on the pink light guide unit 200, the size (i.e., height) of the light guide unit 200 in the light incident direction E needs to be less than or equal to 50mm to achieve a more uniform surface light emitting effect.

It should be noted that, for embodiments 3 and 4, in the case that the light guide unit 200 is red or pink, the color of part or all of the back plate assembly 410 is not limited to white, but may be other colors, such as, but not limited to, the light guide unit 200 is pink, and the color of part or all of the back plate assembly 410 is red.

Example 5

The present embodiment is different from embodiment 3 in that, in order to make the unlit color of the light function of the corresponding lighting device 1 substantially red, a colorless and transparent light guide unit 200 and a back plate assembly 410, some or all of which are red or pink, can be adopted. As described above, the colorless and transparent light guide unit 200 has the weakest absorption effect on red light, and the inventor has found through research that, when part or all of the color of the backplane assembly 410 is red and the colorless and transparent light guide unit 200 is adopted, the size (i.e., the height size) of the light guide unit 200 in the light incident direction E needs to be less than or equal to 45mm, so as to achieve a relatively uniform surface light effect.

Example 6

The present embodiment is based on the optical module 10 in embodiment 2 shown in fig. 6 and 7, that is, the optical module 10 has a three-layer structure of a back plate module 410, a light guide unit 200 and a transparent front plate 300. In this case, the color of the light function of the corresponding lighting device 1 in the unlit state is determined by at least the superposition of the color of the back plate assembly 410, the color of the light guide unit 200, and the color of the transparent front plate 300.

In order to make the unlit color of the light function of the corresponding lighting device 1 substantially red, a red or pink transparent front plate 300, a colorless transparent light guide unit 200, and a back plate assembly 410, some or all of which are white or red or pink, may be selected. As described above, the colorless and transparent light guide unit 200 has the weakest light absorption effect, and the inventors have studied and found that, when the color of the transparent front plate 300 is red and the color of part or all of the back plate assembly 410 is white, the size (i.e., the height dimension) of the light guide unit 200 in the light incident direction E needs to be less than or equal to 55mm to achieve a more uniform surface light emission effect.

In the present embodiment, the added transparent front plate 300 is more free in the selection of materials and colors with respect to the light guide unit 200, and thus the degree of freedom in selecting the light guide unit 200 can be increased, and a designer can select an appropriate light guide unit 200 according to optical requirements, cost requirements, and the like, rather than being limited to only the light guide unit 200 having a light function and a non-lit color.

According to an embodiment of the present invention, a vehicle is further included, comprising a lighting device 1 as described above.

The present invention is not limited to the above configuration, and various other modifications may be adopted. While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as disclosed herein. Accordingly, the scope of the present invention should be limited only by the attached claims.

Claims

1. An optical assembly (10), characterized in that the optical assembly (10) comprises:

a light source (110);

and the light guide unit (200), the light guide unit (200) is approximately plate-shaped, and light rays from the light source (110) enter from at least one end face of the light guide unit (200) and are emitted from a light-emitting face of the light guide unit (200).

2. The optical assembly (10) of claim 1, wherein the optical assembly (10) further comprises:

the back plate assembly (410) is arranged on one side, opposite to the light emergent surface, of the light guide unit (200).

3. The optical assembly (10) of claim 2, wherein the back-plate assembly (410) is configured to reflect light from the light-guiding unit (200) towards the light-exiting surface.

4. The optical assembly (10) of claim 3, wherein the back-plate assembly (410) comprises a back-plate configured to reflect light from the light guiding unit (200) towards the light exit surface.

5. The optical assembly (10) of claim 3, wherein the backplane assembly (410) comprises a backplane configured to support the reflective layer and a reflective layer disposed between the backplane and the light guide unit (200) and configured to reflect light from the light guide unit (200) toward the light exit surface.

6. The optical assembly (10) of claim 1, wherein light from the light source (110) is incident from a plurality of end faces of the light guide unit (200).

7. The optical assembly (10) of claim 1, wherein the light guiding unit (200) comprises scattering particles inside, the scattering particles being configured to scatter light from the light source (110).

8. The optical assembly (10) of claim 1, wherein a surface of the light guiding unit (200) opposite the light exit surface comprises an optical decoupling element configured to cause light rays from the light source (110) to exit the light exit surface.

9. The optical assembly (10) of claim 8, wherein the optical decoupling elements comprise one or more of serrations, stripes, dermatoglyphs, squares, bumps, and dimples.

10. The optical assembly (10) of claim 1, wherein a surface of the light guiding unit (200) opposite the light exit surface is at least partially inclined towards the light exit surface to reflect light from the light source (110) towards the light exit surface.

11. The optical assembly (10) of claim 10, wherein a surface of the light guiding unit (200) opposite the light exit surface comprises a plurality of total reflection facets configured to totally reflect light from the light source (110) towards the light exit surface.

12. The optical assembly (10) of claim 1, wherein the light guiding unit (200) has a decreasing thickness in the direction of light entrance.

13. The optical assembly (10) of claim 12, wherein the ratio of the maximum thickness to the minimum thickness of the light guide unit (200) is greater than 1 and less than or equal to 3.125.

14. The optical assembly (10) according to any one of claims 2 to 13, further comprising a transparent front plate (300), the transparent front plate (300) being arranged on the same side of the light guiding unit (200) as the exit surface and being configured to transmit light from the exit surface.

15. The optical assembly (10) of claim 14, wherein the optical assembly (10) further comprises a scattering layer arranged between the light guiding unit (200) and the transparent front plate (300) to scatter light from the light guiding unit (200).

16. The optical assembly (10) of any one of claims 2 to 5, wherein all or a portion of the backplane assembly (410) is white in color.

17. The optical assembly (10) of claim 16, wherein the light guide unit (200) is red or pink in color.

18. The optical assembly (10) of claim 17, wherein the height of the light guide unit (200) is less than or equal to 30mm in the case where the light guide unit (200) is red in color, and the height of the light guide unit (200) is less than or equal to 50mm in the case where the light guide unit (200) is pink in color.

19. Optical assembly (10) according to any one of claims 2 to 13, characterized in that the light-guiding unit (200) is red or pink in colour.

20. The optical assembly (10) of any one of claims 2 to 5, wherein the light guide unit (200) is pink in color and a portion or all of the back plate assembly (410) is red in color.

21. The optical assembly (10) according to any one of claims 2 to 13, wherein the light guiding unit (200) is a colorless transparent light guide.

22. The optical assembly (10) of any one of claims 2 to 5, wherein the light guide unit (200) is a colorless transparent light guide and a portion or all of the color of the back plate assembly (410) is red or pink.

23. The optical assembly (10) of claim 22, wherein the height of the light guide unit (200) is less than or equal to 45mm in the case where some or all of the color of the backplane assembly (410) is red.

24. The optical assembly (10) of claim 14, wherein the light guide unit (200) is a colorless transparent light guide.

25. The optical assembly (10) of claim 24, wherein, in case the optical assembly (10) further comprises a back plate assembly (410) disposed at a side of the light guiding unit (200) opposite to the light exit surface,

the transparent front plate (300) is red or pink in color, and part or all of the back plate assembly (410) is white or red or pink in color.

26. The optical assembly (10) of claim 25, wherein the height of the light guiding unit (200) is less than or equal to 55mm in the case where the transparent front plate (300) is red in color and some or all of the back plate assembly (410) is white in color.

27. The optical assembly (10) of any one of claims 2 to 5, wherein the backplane assembly (410) is further configured to form a holder (400) for the optical assembly, the holder (400) being configured to hold the light guiding unit (200).

28. The optical assembly (10) of claim 27, characterized in that the holder (400) at least partially encloses a circumferential outer edge of the light guide unit (200).

29. The optical assembly (10) of claim 27, wherein the holder (400) further comprises a frame (420) mounted to the backplane assembly (410), the light guide unit (200) being sandwiched between the frame (420) and the backplane assembly (410).

30. The optical assembly (10) of claim 29, further comprising a transparent front plate (300), wherein the transparent front plate (300) is disposed on the same side of the light guiding unit (200) as the light exit surface and is configured to transmit light from the light exit surface, and wherein the transparent front plate (300) and the frame body (420) are integrally formed.

31. The optical assembly (10) of claim 27, further comprising a printed circuit board (100), the holder (400) further configured to hold the printed circuit board (100).

32. A lighting device (1) characterized by comprising an optical assembly (10) according to any one of claims 1 to 31.

33. A vehicle, characterized in that it comprises a lighting device (1) according to claim 32.