CN117190122A - Optical assembly, lighting device and vehicle - Google Patents

Abstract

The invention relates to an optical component comprising: a light source; and a light guide unit having a substantially plate shape, wherein the light source enters from at least one end surface of the light guide unit and exits from the light exit surface of the light guide unit. The invention realizes the surface light emitting effect by matching the light source with the light guide unit, and can greatly reduce the cost compared with the OLED proposal in the prior art. The invention also relates to a lighting device and a vehicle.

Description

Optical assembly, lighting device and vehicle

Technical Field

The invention relates to the technical field of car lamps, in particular to an optical assembly, a lighting device and a vehicle.

Background

Lighting devices for providing light for illumination and/or optical indication functions are widely used in various fields, for example in motor vehicles for securing safe driving by means of lighting devices such as lamps. While various types of lights are often required on motor vehicles to perform different functions, including automotive headlamps, daytime running lights, position lights, turn lights, brake lights, backup lights, side marker lights, and the like.

In some cases, for the vehicle lamp modeling, the host factory desires the vehicle lamp to have a uniform surface Light Emitting effect, and the prior art is usually implemented by using an OLED (Organic Light-Emitting Diode), however, the cost of such a scheme is high.

Disclosure of Invention

It is therefore an object of the present invention to propose an optical assembly, a lighting device and a vehicle for implementing an optical function, which at least partly solve the above mentioned problems.

According to one aspect of the present invention, there is provided an optical assembly comprising: a light source; and a light guide unit having a substantially plate shape, wherein light from the light source enters from at least one end surface of the light guide unit and exits from a light exit 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 the light exit surface.

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

According to the embodiment of the invention, the back plate assembly is arranged on the back side of the light guide unit to reflect the light leaked by the light guide unit, so that the optical efficiency and the uniformity of the luminous effect are improved.

In some embodiments, the back plate assembly includes a back plate configured to reflect 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 a very uniform light-emitting effect.

In some embodiments, a surface of the light guide 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, dermatomes, squares, bumps, depressions.

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 light from the light source toward the light exit surface.

In some embodiments, a surface of the light guide unit opposite the light exit surface includes a plurality of total reflection facets configured to totally reflect 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 incident direction. Preferably, the 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. The light guide unit has gradually reduced thickness, so that the loss of light at the position with smaller thickness can be reduced, and the overall loss tends to be consistent, so that the light guide unit has a relatively uniform surface light emitting effect.

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. The transparent front plate can play a role in protecting the light guide unit, and can prevent the light guide unit from being damaged and scratched.

In some embodiments, the optical assembly further includes 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 back plate assembly is white in color.

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

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

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

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

In some embodiments, the height of the light guiding unit is less than or equal to 45mm in case that part 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, the transparent front sheet is red or pink in color and some or all of the back sheet assembly is white or red or pink in color.

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

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

In some embodiments, the holder at least partially encloses the circumferential outer edge of the light guiding unit, such that undesired light leakage at the circumferential outer edge of the light guiding unit may be prevented.

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

In some embodiments, the optical assembly further includes a transparent front plate disposed at 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 a process can be simplified and an overall thickness of the light guide unit can be reduced.

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

According to another aspect of the 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 also provided a vehicle including the above-described lighting device.

Drawings

The above features, technical features, advantages and the manner of attaining them will be further described in greater detail by the description of the preferred embodiments and by reference to the accompanying drawings, in a manner that is clearly understood in the following, wherein,

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 shows a cross-sectional view along line A-A of FIG. 1 and a schematic view of an optical path of an optical assembly 10 according to a first embodiment of the present invention;

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

FIG. 6 shows a cross-sectional view along line A-A of FIG. 1 and a schematic view of an optical path of an optical assembly 10 according to a second embodiment of the present invention;

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

fig. 8 shows a cross-sectional view of the light guide unit 200 along the line A-A in fig. 1 and a schematic view of an optical path.

Detailed Description

Hereinafter, embodiments of the present invention are exemplarily described. As will be appreciated by those skilled in the art, the illustrated embodiments can be modified in various different ways without departing from the spirit of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive. In the following, the same reference numerals generally denote elements that are functionally identical or similar.

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 here, the light function is not particularly limited, and examples thereof may include, but are not limited to, an automobile headlight, a daytime running light, a position light, a turn light, a brake light, a backup light, a side sign light, a logo light, and the like. As shown, the lighting device 1 comprises two optical assemblies 10 having a surface emitting effect, each optical assembly 10 being adapted to perform said specific light function, and which may be staggered to perform a specific shaping, it being understood, of course, that the lighting device 1 may comprise any number of optical assemblies 10, and that these optical assemblies 10 may be arranged arbitrarily according to the shaping requirements.

Example 1

Fig. 4 shows a cross-sectional view of the optical assembly 10 according to the first embodiment of the invention along the line A-A in fig. 1 and a schematic view of the light path, 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 a light source 110 is mounted on the printed circuit board 100 to emit light toward the light guide unit 200, the light source 110 being, 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 in the drawing, the light guide unit 200 has a substantially plate shape including an end surface 210 and front and rear surfaces 220 and 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 and rear surfaces 220 and 230 of the light guide unit 200 toward opposite ends of the side end surfaces 210, during which the light exits from the front surface 220 of the light guide unit 200 along a main light-exiting direction H, that is, the front surface 220 serves as a light-exiting surface of the light guide unit 200, thereby achieving a surface light-emitting effect.

According to an embodiment of the present invention, by making the light source 110 and the light guide unit 200 cooperate to achieve the surface light emitting effect, the cost can be greatly reduced relative to the OLED scheme.

In addition, with respect to the light guide unit 200, some light may leak out from the rear surface 230 of the light guide unit 200 to reduce optical efficiency. Thus, as shown, the optical assembly 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 from the front surface 220, and configured to reflect light leaked from the rear surface 230 toward the front surface 220. In the embodiment of the invention, the back plate assembly is disposed on the back side of the light guiding unit 200 to reflect the light leaked from the light guiding unit 200, so as to improve the optical efficiency and the uniformity of the light emitting effect. In some alternative examples, the backplate assembly 230 is disposed on the same side of the light guide unit 200 as the rear surface 230 and is configured to support the light guide unit 200 without providing a reflective function (e.g., without limitation, in the event that light of the light guide unit 200 does not leak out of the rear 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 exit surface, for example, but not limited to, the back plate may select 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 a non-reflective color and/or material can be selected; 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 (two-shot molding, in-mold injection molding, etc.), a spray coating process, or the like, and both may be separately formed.

In some examples, the light from the light source 110 may propagate through total reflection after entering the inside of the light guide unit 200, and in order to allow the light to exit from the front surface 220 of the light guide unit 200, the inside of the light guide unit 200 may include scattering particles, and the light from the light source 110 may be scattered by the scattering particles toward different directions, 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 the scattering particles has good light diffusion characteristics, and can realize a very uniform light-emitting effect. As a non-limiting example, this type of light guiding unit may be chosen from, for example, polymethyl methacrylate (PMMA), such as the light guides identified as LEDs 8n LD12, LD24, LD48, LD96, or Polycarbonate (PC), such as the light guide identified as EL2245, the color of which may be chosen as desired, for example, but not limited to, colorless, pink, red, etc.

In an alternative example, an optical decoupling element may be disposed on the rear surface 230 of the light guide unit 200 to break 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 light incident from the end surface 210 of the light guide unit 200 reaches the rear surface 230 and is reflected toward the front surface 220 to exit through the front surface 220. Preferably, the end face 210 of the light guide unit 200 is provided with a collimator for collimating the light 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 guiding unit 200 may comprise a plurality of total reflection facets configured to totally reflect light from the light source towards the front surface 220 of the light guiding unit 200. Thus, uniformity of lighting effect can be improved while improving optical efficiency.

In some examples, as shown in fig. 4, the light guide unit 200 has a gradually decreasing thickness (thickness, i.e., the 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 gradually loses (e.g., due to light absorption, light leakage, etc. of the light guiding unit 200) when propagating along the light incident direction E, the light guiding unit 200 has a gradually reduced thickness in the light incident direction E, and the loss of the light at the smaller thickness can be reduced, so that the overall loss tends to be uniform, and the light guiding unit 200 has a relatively uniform surface light emitting effect. Preferably, the maximum thickness of the light guide unit 200 (i.e., the thickness at the end surface 210) is greater than or equal to 2mm, less than or equal to 5mm, and the minimum thickness (i.e., the thickness at the end surface opposite to the end surface 210) ranges from greater than or equal to 1.6mm, 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 the light source 210 is illustrated in fig. 4 as entering light from only one end surface of the light guide unit 200, it is understood that it may also enter light from two opposite end surfaces of the light guide unit 200 at the same time, even from three end surfaces, four end surfaces, or more end surfaces 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 surfaces of the light guide unit 200.

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

As shown in fig. 1 to 3, the circumferential edge of the frame 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, wherein the body portion 411 is used to be connected to the frame 420 to clamp the light guiding unit 200, and in particular, the body portion 411 may be welded to the frame 420 by ultrasonic waves, but may be connected to the frame 420 by any other suitable means, 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 cooperating with bolts, but it is also possible to fix the printed circuit board 100 in any other suitable manner.

Example 2

Fig. 6 shows a cross-sectional view of an optical assembly 10 according to a second embodiment of the invention along the line A-A in fig. 1 and a schematic view of the light path, fig. 7 shows an exploded schematic view of a lighting device 1 comprising the optical assembly 10 in fig. 6. The second embodiment is a further optimization on the basis of the first embodiment described above, so that the above description for the first embodiment also applies 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, and the transparent front plate 300 is disposed at the front side of the light guide unit 200, i.e., the same side as the front surface 220, and is 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 or 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 of the diffusion layer and uniformly diffused by the diffusion layer, whereby uniformity of the 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, the printed circuit board 100 is the same as that of embodiment 1 shown in fig. 4 and 5, and thus the above description for the first embodiment is also applicable to the second embodiment. In addition, the transparent front plate 300 is preferably integrally formed with the frame 420, for example, but not limited to, by a two-shot molding process or the like, thereby simplifying the process, reducing the overall thickness of the optical assembly 10.

In the above, embodiments of improving the optical efficiency and the light emitting uniformity of the light guide unit 200 have been described, and further, the lighting devices 1 having different functions need to have respective colors in the unlit state, for example, the rear position lamp, the brake lamp, the backup lamp are substantially red in the unlit state, and the daytime running lamp, the turn lamp are substantially colorless and transparent or translucent in the unlit state. In the following, on the basis of the above-described embodiments, it will be described how a uniform lighting of the lighting device 1 and a specific unlit color of the light function are achieved. In the embodiment of the present invention, taking the example that the light source 110 emits red light, the unlit color of the light function of the lighting device 1 is substantially red, it is understood that the person skilled in the art can undoubtedly replace red with other colors according to actual needs.

Example 3

The present embodiment is based on the optical assembly 10 of embodiment 1 shown in fig. 4 and 5, i.e., the optical assembly 10 has a two-layer structure of the back plate assembly 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 at least by the superposition of the color of the back plate assembly 410 and the color of the light guide unit 200.

To make the unlit color of the light function of the corresponding lighting device 1 substantially red, a back plate assembly 410 with a white color in part or in whole, and a red light guide unit 200 may be employed. In addition, the inventors have found that, based on the red light guide unit 200, the size (i.e., height size) 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 emitting effect.

Example 4

The present embodiment differs 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 with a white color in part or in whole, and a pink light guiding unit 200 may be employed. In addition, the inventors have studied that the pink light guide unit 200 has a weak absorption effect on red light compared to the red light guide unit 200, and have found that 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 50mm to achieve a uniform surface light emitting effect on the basis of using the pink light guide unit 200.

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

Example 5

The present embodiment differs 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 transparent light guide unit 200 and a back plate assembly 410 having a partial or full color of red or pink may be employed. As described above, the absorption of the red light by the colorless and transparent light guide unit 200 is the weakest, and the inventors have found that in the case where part or all of the color of the back plate assembly 410 is red and the colorless and transparent light guide unit 200 is used, the dimension (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 45mm to achieve a relatively uniform surface light emitting effect.

Example 6

The present embodiment is based on the optical assembly 10 in embodiment 2 shown in fig. 6 and 7, that is, the optical assembly 10 has a three-layer structure of a back plate assembly 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 having a white or red or pink color in part or whole may be selected. As described above, the light absorption effect of the colorless and transparent light guide unit 200 is the weakest, and the inventors have found that in the case where the color of the transparent front plate 300 is red and part or all of the back plate assembly 410 is white, the dimension (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 relatively uniform surface light emitting effect.

In the present embodiment, the added transparent front plate 300 is more free in selection of materials and colors with respect to the light guide unit 200, whereby the degree of freedom in selecting the light guide unit 200 can be improved, and a designer can select an appropriate light guide unit 200 according to optical requirements, cost requirements, etc., instead of being limited to only the light guide unit 200 having a light function of unlit colors.

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

The present invention is not limited to the above-described structure, and other various modifications may be employed. 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 invention should be limited only by the attached claims.

Claims (33)

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

a light source (110);

and a light guide unit (200), wherein the light guide unit (200) has a substantially plate shape, and light from the light source (110) enters from at least one end surface of the light guide unit (200) and exits from the light exit surface of the light guide unit (200).

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

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

3. The optical assembly (10) of claim 2, wherein the back plate assembly (410) is configured to reflect light from the light guide unit (200) toward the light exit surface.

4. An optical assembly (10) as claimed in claim 3, wherein the back plate assembly (410) comprises a back plate configured to reflect light from the light guide unit (200) towards the light exit surface.

5. An optical assembly (10) as claimed in claim 3, wherein the back plate assembly (410) comprises a back plate configured to support the reflective layer and a reflective layer disposed between the back plate and the light guiding unit (200) and configured to reflect light rays from the light guiding unit (200) towards 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) internally comprises scattering particles 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 such that light from the light source (110) exits the light exit surface.

9. The optical assembly (10) of claim 8, wherein the optical decoupling element comprises one or more of serrations, stripes, dermatomes, squares, bumps, depressions.

10. The optical assembly (10) of claim 1, wherein a surface of the light guide 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 guide unit (200) opposite the light exit surface comprises a plurality of total reflection facets configured to totally reflect light from the light source (110) toward the light exit surface.

12. The optical assembly (10) according to claim 1, wherein the light guiding unit (200) has a gradually decreasing thickness in the light entering direction.

13. The optical assembly (10) of claim 12, wherein the ratio of the maximum thickness to the minimum thickness of the light guiding 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), 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 rays from the light 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 claims 2 to 13, wherein all or part of the back plate assembly (410) is white in color.

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

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

19. The optical assembly (10) according to claims 2 to 13, wherein the light guiding unit (200) is red or pink in color.

20. The optical assembly (10) of claim 19, wherein the light guide unit (200) is pink in color and part or all of the back plate assembly (410) is red in color.

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

22. The optical assembly (10) of claim 21, wherein some or all of the back plate assembly (410) is red or pink in color.

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

24. The optical assembly (10) according to claim 14 or 15, wherein the light guiding unit (200) is a colorless transparent light guide.

25. The optical assembly (10) of claim 24, wherein 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 case the color of the transparent front plate (300) is red and part or all of the color of the back plate assembly (410) is white.

27. The optical assembly (10) of any of claims 2 to 13, wherein the back plate assembly (410) is further configured to form a holder (400) of the optical assembly, the holder (400) being configured to hold the light guiding unit (200).

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

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

30. The optical assembly (10) of claim 29, further comprising a transparent front plate (300), the transparent front plate (300) being disposed on the same side of the light guide unit (200) as the light exit surface and configured to transmit light from the light exit surface, the transparent front plate (300) and the frame (420) being 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) as claimed in any one of claims 1 to 31.

33. A vehicle, characterized by comprising a lighting device (1) as claimed in claim 32.