Optical system for long distance uniform illumination

Abstract

The application discloses a light curtain optical system for realizing long-distance uniform lighting, which comprises at least one light guide connecting part, a first light guide arranged on the left side of the light guide connecting part and a second light guide arranged on the right side of the light guide connecting part, namely the first light guide and the second light guide are connected through the light guide connecting part, the bottom of the first light guide is provided with a first light curtain, and the bottom of the second light guide is provided with a second light curtain; the light inlet end of the first light guide is provided with a first LED light source, and the light inlet end of the second light guide is provided with a second LED light source; the lower surface of the first light curtain is provided with a first surface microstructure, and the lower surface of the second light curtain is provided with a second surface microstructure; the light inlet end of the light guide connecting part is provided with a diffusion pattern, and the diffusion pattern is provided with a third LED light source; the transition area between the first light guide and the first light curtain is connected through a first light guide light curtain connecting part, and the transition area between the second light guide and the second light curtain is connected through a second light guide light curtain connecting part. The light curtain optical system realizes the uniform lighting effect under long distance.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile lighting, and in particular to a light curtain optical system for realizing long-distance uniform lighting. Background Art

[0002] For long light guides and light curtains, traditional automotive lighting uses the following two methods:

[0003] The first approach involves separating the light guide from the light curtain. The light guide is designed with light guide teeth, allowing light to exit parallel to the light curtain's incident surface, resulting in uniform illumination across the entire curtain. However, this approach comes with two issues: increased cost and low overall energy consumption, necessitating the use of high-power LEDs to achieve the customer's brightness requirements.

[0004] The second approach involves directly connecting the light guide and light curtain together, controlling the light uniformity by designing the size and density of the light curtain pattern. However, this approach results in significantly poorer overall lighting performance, which many customers find unacceptable. Using a fixed pattern can result in brighter light near the LEDs and dimmer light farther away. Furthermore, increasing requirements for longer light curtains result in increasingly pronounced brightness variations, making uniform lighting a pressing issue. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] To this end, the present invention proposes a light curtain optical system that achieves long-distance uniform lighting, which is used to solve the problem of uneven lighting during long-distance light guide and light curtain transmission, and achieve a uniform lighting effect over a long distance.

[0007] According to an embodiment of the present invention, a light curtain optical system for achieving long-distance uniform lighting includes at least one light guide connecting portion, a first light guide with a gradually changing radius arranged on the left side of the light guide connecting portion, and a second light guide with a gradually changing radius arranged on the right side of the light guide connecting portion. A first light curtain is arranged at the bottom of the first light guide, and a second light curtain is arranged at the bottom of the second light guide. The first light guide and the first light curtain constitute a first light guide light curtain system, and the second light guide and the second light curtain constitute a second light guide light curtain system. A first LED light source is arranged at the light input end of the first light guide, and a second LED light source is arranged at the light input end of the second light guide. A first surface microstructure for totally reflecting light and transmitting the light upward and emitting light from the front of the first light curtain is arranged on the lower surface of the first light curtain. A second surface microstructure is provided on the lower surface of the second light curtain for totally reflecting light and transmitting the light upward so that light is emitted from the front of the second light curtain; a diffusion pattern is provided at the light input end of the light guide connection part for diffusing and transmitting light, and a third LED light source is provided at the diffusion pattern. The third LED light source is used to illuminate the light guide connection part so that the light at the light guide connection part is evenly distributed, and to fill in the first light guide light curtain system and the second light guide light curtain system near the light guide connection part to achieve overall lighting with a uniform and uninterrupted lighting effect; the transition area between the first light guide and the first light curtain is connected by a first light guide light curtain connection part with a gradual thickness, and the transition area between the second light guide and the second light curtain is connected by a second light guide light curtain connection part with a gradual thickness.

[0008] The beneficial effect of the present invention is that the LED light source is placed at the light input end of the light guide and the light input end of the light guide connecting part respectively, and the light emitted by the LED light source is transmitted through the gradient radius light guide and the gradient thickness light guide light curtain connecting part, so that the corresponding part of the light curtain is evenly lit. At the same time, the middle of the two light guides are connected by the light guide connecting part, and the light curtain in the middle part is lit through the LED light transmission, which can achieve uniform lighting of the long-distance light curtain system.

[0009] According to an embodiment of the present invention, the first light guide and the second light guide are symmetrically distributed on the left and right sides of the light guide connecting portion.

[0010] According to one embodiment of the present invention, the first light curtain and the second light curtain are symmetrically distributed on the left and right sides of the light guide connecting portion.

[0011] According to one embodiment of the present invention, the first light guide and light curtain connecting portion and the second light guide and light curtain connecting portion are symmetrically distributed on the left and right sides of the light guide connecting portion.

[0012] According to one embodiment of the present invention, in the first light guide, the radius of the end close to the first LED light source is large, and the radius of the end away from the first LED light source is small; in the second light guide, the radius of the end close to the second LED light source is large, and the radius of the end away from the second LED light source is small.

[0013] According to one embodiment of the present invention, in the connecting portion of the first light guide and light curtain, the thickness is thin at the end close to the first LED light source, and thick at the end away from the first LED light source; in the connecting portion of the second light guide and light curtain, the thickness is thin at the end close to the second LED light source, and thick at the end away from the second LED light source.

[0014] According to one embodiment of the present invention, the front surface of the light guide connecting portion is in the shape of an isosceles triangle with the vertex angle facing downward, and the upper side surface, left side surface and right side surface of the light guide connecting portion all have diffusion patterns.

[0015] According to one embodiment of the present invention, a third LED light source is provided on the diffusion pattern located on the left side of the light guide connection part. The third LED light source uniformly distributes the light at the light guide connection part, and uniformly distributes the light in the area near the light guide connection part of the first light curtain on the left, and uniformly distributes the light in the area near the light guide connection part of the second light curtain on the right.

[0016] According to one embodiment of the present invention, a groove is provided on the upper portion of the front surface of the light guide connecting portion.

[0017] According to one embodiment of the present invention, there are two grooves, which are symmetrically distributed on the left and right sides of the upper front part of the optical fiber connecting part, so as to reduce the energy concentration at the light end of the low beam and improve the uniformity.

[0018] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the structure of the present invention Figure 2 ;

[0023] Figure 3 yes Figure 1 Front view of

[0024] Figure 4 yes Figure 1 rear view.

[0025] The numbers in the accompanying drawings are: 1. light guide connecting part; 2. first light guide; 3. second light guide; 4. first light curtain; 5. second light curtain; 6. first LED light source; 7. second LED light source; 8. first surface microstructure; 9. second surface microstructure; 10. diffusion pattern; 12. first light guide-light curtain connecting part; 13. second light guide-light curtain connecting part; 14. groove. DETAILED DESCRIPTION

[0026] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] The implementation of the long-distance uniform lighting optical screen optical system of the embodiment of the present application is specifically described below with reference to the accompanying drawings, the light guide optical system structure applied to the automobile lamp, and mainly applied to the long light guide optical screen system.

[0030] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The implementation of the long-distance uniform lighting optical screen optical system of the present application comprises at least one light guide connecting part 1, a first light guide 2 with gradually changing radius arranged on the left side of the light guide connecting part 1, and a second light guide 3 with gradually changing radius arranged on the right side of the light guide connecting part 1. A first optical screen 4 is arranged at the bottom of the first light guide 2, and a second optical screen 5 is arranged at the bottom of the second light guide 3. The first light guide 2 and the first optical screen 4 form a first light guide optical screen system, and the second light guide 3 and the second optical screen 5 form a second light guide optical screen system.

[0031] Among them, the first light guide 2 and the second light guide 3 are both light guides with gradually changing radius. The first light guide 2 and the first optical screen 4 adopt a structure mode of being connected together. Similarly, the second light guide 3 and the second optical screen 5 also adopt a structure mode of being connected together.

[0032] A first LED light source 6 is arranged at the light inlet end of the first light guide 2, and a second LED light source 7 is arranged at the light inlet end of the second light guide 3.

[0033] Among them, the first LED light source 6 is arranged on the left end of the first light guide 2 and the right end of the first light guide 2, the main body part of the first light guide 2 is horizontally distributed, the left end of the first light guide 2 and the right end of the first light guide 2 both have a tendency to point to the back of the optical screen optical system, and the angle of the left end of the first light guide 2 deviating from the main body part of the first light guide 2 is smaller, and the angle of the right end of the first light guide 2 deviating from the main body part of the first light guide 2 is larger. Similarly, the second LED light source 7 is arranged on the left end of the second light guide 3 and the right end of the second light guide 3, the main body part of the second light guide 3 is horizontally distributed, the left end of the second light guide 3 and the right end of the second light guide 3 both have a tendency to point to the back of the optical screen optical system, and the angle of the left end of the second light guide 3 deviating from the main body part of the second light guide 3 is larger, and the angle of the right end of the second light guide 3 deviating from the main body part of the second light guide 3 is smaller.

[0034] A first surface microstructure 8 is provided on the lower surface of the first light curtain 4 for totally reflecting light (light emitted by the first LED light source 6 and the light emitted by the third LED light source) and transmitting the light upward so that light is emitted from the front of the first light curtain 4. A second surface microstructure 9 is provided on the lower surface of the second light curtain 5 for totally reflecting light (light emitted by the second LED light source 7 and the light emitted by the third LED light source) and transmitting the light upward so that light is emitted from the front of the second light curtain 5.

[0035] By providing a first surface microstructure 8 on the first light curtain 4, total reflection is broken, light is emitted, and uniform lighting of the first light curtain 4 is ensured. Similarly, by providing a second surface microstructure 9 on the second light curtain 5, total reflection is broken, light is emitted, and uniform lighting of the second light curtain 5 is ensured.

[0036] The first surface microstructure 8 may be in the shape of a hemisphere, a cone, a triangle, a rectangle, or a leather grain, etc. The second surface microstructure 9 may be in the shape of a hemisphere, a cone, a triangle, a rectangle, or a leather grain, etc.

[0037] Of course, the surface microstructure can be designed together with the dermatoglyphics, that is, the dermatoglyphics in the optical microstructure can be used together with other optical microstructures to further improve the lighting uniformity. For example, microstructures such as dermatoglyphics can be designed on the hemispherical surface microstructure as needed.

[0038] The first surface microstructures 8 are uniformly spaced and of the same size, and the second surface microstructures 9 are also uniformly spaced and of the same size. The microstructures and spacing can be adjusted according to actual needs, but the spacing must be consistent across the entire system.

[0039] The light guide connecting portion 1 is a smooth curved plate, which is located in the middle between the first light guide 2 and the second light guide 3 , and the connection between the first light guide 2 and the second light guide 3 is achieved through the curved plate.

[0040] A diffusion pattern 10 for diffusing and transmitting light is provided at the light incident end of the optical fiber connection part 1, and a third LED light source is provided at the diffusion pattern 10. The third LED light source is used to illuminate the optical fiber connection part 1 so that the light at the optical fiber connection part 1 is evenly distributed, and to supplement the first optical fiber light curtain system and the second optical fiber light curtain system of the optical fiber connection part 1, so as to achieve overall lighting and present a uniform and uninterrupted lighting effect.

[0041] The front surface of the light guide connecting portion 1 is in the shape of an isosceles triangle with the vertex facing downwards. The upper side surface, the left side surface and the right side surface of the light guide connecting portion 1 are all provided with diffusion patterns 10 .

[0042] A third LED light source is provided on the diffusion pattern 10 located on the left side of the optical waveguide connection part 1. The third LED light source uniformly distributes the light at the optical waveguide connection part 1, and uniformly distributes the light in the area near the optical waveguide connection part 1 of the first light curtain 4 on the left, and uniformly distributes the light in the area near the optical waveguide connection part 1 of the second light curtain 5 on the right.

[0043] Alternatively, a third LED light source is provided on the diffusion pattern 10 located on the right side of the optical waveguide connection part 1, and the third LED light source uniformly distributes the light at the optical waveguide connection part 1, and uniformly distributes the light in the area near the optical waveguide connection part 1 of the second light curtain 5 on the right side, and uniformly distributes the light in the area near the optical waveguide connection part 1 of the first light curtain 4 on the left side.

[0044] A groove 14 is provided on the upper front portion of the light guide connector 1. Two grooves 14 are symmetrically located on the left and right sides of the upper front portion of the light guide connector 1. These grooves 14 are used to reduce energy concentration at the low-beam light-introduction end and improve uniformity. These grooves 14 effectively reduce the impact of strong light from the first LED light source 6 at the low-beam light-introduction end of the light guide connector 1 on the light curtain, preventing the generation of bright spots.

[0045] Among them, the third LED light source serves as the light source for lighting the center area, and the third LED light source makes the light of the optical fiber connection part 1 evenly distributed in the light-emitting light curtain area. By setting a diffusion pattern 10 in the middle part of the side of the through-type optical fiber connection part 1, and at the same time setting an LED for supplementing the light in the middle part at the diffusion pattern 10, the light curtain optical system finally achieves a uniform lighting effect. The diffusion pattern 10 can be hemispherical, vertical stripes, leather grain, etc. Specifically, a few LEDs are added on the left and right sides of the optical fiber connection part 1 to illuminate the light curtain corresponding to the optical fiber connection part 1, so that the entire light curtain can be lit. In addition, by designing the diffusion pattern 10 at the light input end of the optical fiber connection part 1, the light energy and the light curtain corresponding to the optical fiber are matched, so that the brightness of the entire light curtain optical system reaches a consistent effect, that is, the diffusion pattern 10 is also provided at the part of the optical fiber connection part 1 close to the light curtain, so as to further diffuse the light and improve the uniformity of the light curtain end.

[0046] Grooves 14 located on the upper front surface of the light guide connector 1 further optimize the light distribution thereon, enhancing the overall uniformity of the display. It should be noted that since the energy near the light guide's entrance is relatively high and needs to be reduced, grooves 14 are designed on the light guide connector 1 to reduce the amount of light directly transmitted through the light guide to the pattern at the bottom of the light guide connector 1, maintaining overall energy uniformity.

[0047] Of course, while the diffusion pattern 10 is provided at the light incident end of the light guide connecting portion 1 , a leather grain structure may also be provided to further diffuse the light.

[0048] The transition area between the first light guide 2 and the first light curtain 4 is connected by a first light guide-light curtain connecting portion 12 with a gradually varying thickness. The transition area between the second light guide 3 and the second light curtain 5 is connected by a second light guide-light curtain connecting portion 13 with a gradually varying thickness.

[0049] The first light guide light curtain connecting portion 12 is specially designed with a gradually varying thickness, so that the light emitted from the first light curtain 4 is uniformly emitted. The second light guide light curtain connecting portion 13 is specially designed with a gradually varying thickness, so that the light emitted from the second light curtain 5 is uniformly emitted.

[0050] It should be noted that the headlight light source complies with the light color requirements of GB-4785 for different functional lamps. The LED light source can use white, yellow, red, blue, and green light. The number of LED light sources and light guides is designed according to needs.

[0051] According to one embodiment of the present invention, the first light guide 2 and the second light guide 3 are symmetrically distributed on the left and right sides of the light guide connecting portion 1 .

[0052] According to one embodiment of the present invention, the first light curtain 4 and the second light curtain 5 are symmetrically distributed on the left and right sides of the light guide connecting portion 1 .

[0053] According to one embodiment of the present invention, the first light guide and light curtain connecting portion 12 and the second light guide and light curtain connecting portion 13 are symmetrically distributed on the left and right sides of the light guide connecting portion 1 .

[0054] According to one embodiment of the present invention, in the first light guide 2, the radius close to the first LED light source 6 is large, and the radius away from the first LED light source 6 is small; in the second light guide 3, the radius close to the second LED light source 7 is large, and the radius away from the second LED light source 7 is small.

[0055] According to one embodiment of the present invention, in the first light guide light curtain connecting portion 12, the thickness is thin at the end close to the first LED light source 6, and thick at the end away from the first LED light source 6; in the second light guide light curtain connecting portion 13, the thickness is thin at the end close to the second LED light source 7, and thick at the end away from the second LED light source 7.

[0056] According to one embodiment of the present invention, the light curtain optical system for achieving long-distance uniform lighting further includes a decorative ring, the first light guide 2 and the second light guide 3 are shielded by the decorative ring, the first light curtain 4 and the second light curtain 5 are both exposed to the outside, and the first light curtain 4 and the second light curtain 5 are both bent and divided into two parts, with the middle part being the larger bend (see Figure 4 , because of bilateral symmetry, the light-emitting area on each side is bent).

[0057] By designing the light guide into a light guide structure with a gradient radius, light can be distributed more evenly in the light guide; by designing the light guide-light curtain connection part into a structure with a gradient size, the light guide-light curtain connection part close to the light input end is thin, and the light guide-light curtain connection part away from the light input end is thick, so that the light is redistributed for a second time; by adding a diffusion pattern 10 to the light guide connection part 1 used to connect the two light guides and arranging LEDs at this diffusion pattern 10, the light of the light guide connection part 1 is evenly distributed; combined with the above designs, the entire light curtain optical system ultimately achieves a uniform lighting effect, and realizes uniform distribution of light in the entire light curtain area.

[0058] The present invention adopts an optical system having a light guide connecting portion 1, a light guide-light curtain connecting portion with a gradient thickness, and a light guide with a gradient radius. An LED light source is placed at the light input end of the light guide and the light input end of the light guide connecting portion. The light emitted by the LED light source passes through the gradient structure on the light guide and the light guide-light curtain connecting portion, so that the energy passing through the light curtain is redistributed, and finally is totally reflected by the pattern at the bottom of the light curtain, thereby ultimately making the entire light curtain system evenly lit.

[0059] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0060] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A light curtain optical system for achieving long-distance uniform lighting, characterized by: The invention comprises at least one light guide connecting portion (1), a first light guide (2) with a gradually changing radius arranged on the left side of the light guide connecting portion (1), and a second light guide (3) with a gradually changing radius arranged on the right side of the light guide connecting portion (1); a first light curtain (4) is arranged at the bottom of the first light guide (2), and a second light curtain (5) is arranged at the bottom of the second light guide (3); The first light guide (2) and the first light curtain (4) constitute a first light guide light curtain system, and the second light guide (3) and the second light curtain (5) constitute a second light guide light curtain system; A first LED light source (6) is provided at the light incident end of the first light guide (2), and a second LED light source (7) is provided at the light incident end of the second light guide (3); A first surface microstructure (8) for totally reflecting light and transmitting the light upward and emitting light from the front of the first light curtain (4) is provided on the lower surface of the first light curtain (4); a second surface microstructure (9) for totally reflecting light and transmitting the light upward and emitting light from the front of the second light curtain (5) is provided on the lower surface of the second light curtain (5); A diffusion pattern (10) for diffusing and transmitting light is provided at the light-entering end of the light guide connecting portion (1), and a third LED light source is provided at the diffusion pattern (10). The third LED light source is used to illuminate the light guide connecting portion (1) so that the light at the light guide connecting portion (1) is evenly distributed, and to supplement the first light guide light curtain system and the second light guide light curtain system near the light guide connecting portion (1), thereby achieving an overall lighting effect with uniform and uninterrupted lighting. The transition area between the first light guide (2) and the first light curtain (4) is connected via a first light guide-light curtain connecting portion (12) with a gradually varying thickness, and the transition area between the second light guide (3) and the second light curtain (5) is connected via a second light guide-light curtain connecting portion (13) with a gradually varying thickness; The front surface of the light guide connecting portion (1) is in the shape of an isosceles triangle with the vertex facing downwards, and the upper side surface, the left side surface and the right side surface of the light guide connecting portion (1) are all provided with diffusion patterns (10).

2. The light curtain optical system for achieving long-distance uniform lighting according to claim 1, characterized in that: The first light guide (2) and the second light guide (3) are symmetrically distributed on the left and right sides of the light guide connecting portion (1).

3. The light curtain optical system for achieving long-distance uniform lighting according to claim 1, characterized in that: The first light curtain (4) and the second light curtain (5) are symmetrically distributed on the left and right sides of the light guide connecting portion (1).

4. The light curtain optical system for achieving long-distance uniform lighting according to claim 1, characterized in that: The first light guide light curtain connecting portion (12) and the second light guide light curtain connecting portion (13) are symmetrically distributed on the left and right sides of the light guide connecting portion (1).

5. The light curtain optical system for achieving long-distance uniform lighting according to claim 1, characterized in that: In the first light guide (2), the radius of the end close to the first LED light source (6) is large, and the radius of the end far from the first LED light source (6) is small; In the second light guide (3), the radius of the end close to the second LED light source (7) is large, and the radius of the end far from the second LED light source (7) is small.

6. The light curtain optical system for achieving long-distance uniform lighting according to claim 1, characterized in that: In the first light guide light curtain connecting portion (12), the thickness is thin at an end close to the first LED light source (6), and thick at an end away from the first LED light source (6); In the second light guide and light curtain connecting portion (13), the thickness is thin at the end close to the second LED light source (7), and thick at the end away from the second LED light source (7).

7. The light curtain optical system for achieving long-distance uniform lighting according to claim 1, characterized in that: A third LED light source is provided on the diffusion pattern (10) on the left side of the light guide connecting portion (1). The third LED light source evenly distributes light at the light guide connecting portion (1), evenly distributes light in the area of ​​the first light curtain (4) near the light guide connecting portion (1) on the left, and evenly distributes light in the area of ​​the second light curtain (5) near the light guide connecting portion (1) on the right.

8. The light curtain optical system for achieving long-distance uniform lighting according to claim 1, characterized in that: A groove (14) is provided on the upper portion of the front surface of the optical connecting portion (1).

9. The light curtain optical system for achieving long-distance uniform lighting according to claim 8, characterized in that: The number of the grooves (14) is two, and the two grooves (14) are symmetrically distributed on the left and right sides of the upper front portion of the light guide connecting portion (1), and are used to reduce the energy concentration at the light end of the low beam guide, thereby improving uniformity.

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