Light guide structure with uniform illumination
By designing a multi-faceted reflective surface and a light guide structure with specific patterns, the problem of bright spots at the edge of the car headlight guide plate was solved, achieving a uniform lighting effect for the light guide plate and enhancing the aesthetics and three-dimensionality of the headlight.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DANYANG YISHAN LAMP EQUIP MFR
- Filing Date
- 2025-07-05
- Publication Date
- 2026-08-04
AI Technical Summary
Existing automotive headlights have a bright spot problem at the edge of the light guide plate, resulting in uneven illumination and making it difficult to meet design requirements.
A uniformly illuminated light guide structure is designed, employing a multi-faceted reflective surface structure and a specific pattern design, including a first reflective surface, a second reflective surface, a third reflective surface, and a fourth reflective surface. Combined with a grooved surface, uniform light emission is achieved through multiple total internal reflections.
This achieves a uniform lighting effect on the light guide plate, eliminates the problem of bright spots at the edges, and enhances the aesthetics and three-dimensionality of the headlights.
Smart Images
Figure CN224594869U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an optical system structure for use in automotive lights, belonging to the field of automotive lighting technology. Background Technology
[0002] With the rapid development of the automotive lighting industry, the requirements for the appearance and styling of automotive lights are becoming increasingly stringent. Achieving uniform illumination while maintaining aesthetic appeal has always been a key focus in automotive light design. To enhance the three-dimensional effect of the entire light beam, surface LED technology has been gradually introduced. However, due to the specific characteristics of the design structure, the form of surface LEDs has also changed. Certain structural designs can increase the problem of uniform illumination. To address this issue, existing solutions include increasing the number of LED light sources, adding textured shielding, and designing optical patterns.
[0003] When direct light is reflected, the illumination effect at the edge of the light guide plate has a bright spot problem, which does not meet the uniformity requirements of the headlight design. Utility Model Content
[0004] In view of the above problems, this utility model achieves the light output effect of uniform illumination of the light guide plate by designing a light guide structure with uniform illumination.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a uniformly illuminated light guide structure, comprising a light guide body, a concentrator disposed at the bottom of one end of the light guide body, an LED light source disposed at the focal point of the light inlet of the concentrator, a first reflective surface with a certain tilt angle formed directly above the concentrator on the light guide body, and a groove surface formed on the upper surface of the middle part of the light guide body near the first reflective surface. A second reflective surface and a third reflective surface are formed on the upper and lower surfaces of the middle part of the light guide body at an angle of 0 to 30° with the direction of light guide extension, and a light-emitting surface and a fourth reflective surface are formed on the upper and lower surfaces of the right side of the light guide body.
[0006] The light emitted by the LED light source is collimated by a concentrator and incident into the light guide body. It first incident on the first reflective surface, where the light is totally reflected by the first reflective surface in the upper part to the groove surface, and then reflected by the groove structure to the third reflective surface. The light is then totally reflected by the third reflective surface to the second reflective surface; then totally reflected by the second reflective surface to the fourth reflective surface, and finally reflected by the fourth reflective surface to the light-emitting surface. In the middle and lower parts, the light is totally reflected by the first reflective surface to the second reflective surface or directly reflected to the light-emitting surface. The light reflected to the second reflective surface is then totally reflected to the fourth reflective surface, and then incident from the fourth reflective surface to the light-emitting surface. The light is then totally reflected back from the light-emitting surface to the fourth reflective surface. After multiple total reflections on the fourth reflective surface and the light-emitting surface, the light is finally emitted uniformly through the light-emitting surface.
[0007] The first reflective surface forms an angle of 40°-60° with the collimated light output direction of the concentrator, while the second and third reflective surfaces form an angle of 0°-30° with the light guide extension direction.
[0008] The second, third, and fourth reflective surfaces are all patterned surfaces.
[0009] The second and third reflective surfaces are horizontal stripes.
[0010] The groove surface is a V-shaped groove, a U-shaped groove, or a semi-circular groove.
[0011] A row of LED light sources is placed at the focal point of the condenser, so that the light emitted by the LED light sources is collimated and emitted through the condenser.
[0012] The concentrator is a stretched concentrator, a circular concentrator, an asymmetric concentrator, or a nested concentrator.
[0013] The concentrator and the light guide are integrated into one unit.
[0014] The fourth reflective surface pattern is a corn kernel pattern, vertical stripes, horizontal stripes, leather texture, or small dot pattern.
[0015] This invention designs the second and third reflective surfaces with horizontal stripes, causing the light to be divided into the upper half reflected by the first reflective surface and the lower half reflected by the middle of the first reflective surface for dispersed illumination. Furthermore, it increases the number of total internal reflections before exiting the light-emitting surface, resulting in more uniform light propagation internally. A V-shaped groove is provided next to the boundary of the first reflective surface to reflect the light to the third reflective surface. Combined with the patterned design of the second and third reflective surfaces, this eliminates the problem of bright spots at the boundary of the light-emitting surface, achieving a uniform light output effect. Attached Figure Description
[0016] Figure 1 This is a schematic cross-sectional view of an embodiment of this utility model patent.
[0017] Figure 2 This is a structural front view of an embodiment of this utility model patent.
[0018] Figure 3 This is a rear view of the structure with circular patterns in an embodiment of this utility model patent.
[0019] Figure 4 This is a rear view of the structure with corn kernel pattern in an embodiment of this utility model patent.
[0020] Figure 5 This is a schematic diagram of the optical path of the upper light-emitting surface in an embodiment of this utility model patent.
[0021] Figure 6 This is a schematic diagram of the light-emitting surface in the middle and lower part of the optical path of an embodiment of this utility model patent. Detailed Implementation
[0022] The light guide structure for uniform illumination proposed in this embodiment includes a light guide body 10, an LED light source 20, a condenser 30, and a bracket 40. The light guide body should include a grooved surface 15, a first reflective surface 11, a second reflective surface 12, a third reflective surface 13, a fourth reflective surface 14, and a light-emitting surface 16.
[0023] In this embodiment, the concentrator 30 is a stretched concentrator, but it can also be a circular concentrator, an asymmetric concentrator, or a nested concentrator, etc. The concentrator and the light guide body can be an integral structure or two independent structures.
[0024] In this embodiment, the LED light source consists of a row of 20 LED light sources placed at the focal point of the condenser and perpendicular to the plane of the condenser, so that the light emitted by the LED light sources is collimated and emitted after passing through the condenser.
[0025] A first reflective surface 11 is formed directly above the condenser 30 in the light guide body 10. The first reflective surface 11 forms a 45° angle with the collimated light direction of the condenser, converting the collimated light from vertical to the direction of the LED light source plane. A second reflective surface is formed on the upper surface of the middle part of the light guide body, and a V-shaped groove surface 15 is formed on the upper surface of the middle part of the light guide body near the first reflective surface. A third reflective surface is formed on the lower surface of the middle part of the light guide body opposite to the second reflective surface. A light-emitting surface 16 and a fourth reflective surface 14 opposite to the light-emitting surface are formed on the right end face of the light guide body away from the first reflective surface.
[0026] In this embodiment, the material of the optical guide body is PC or PMMA.
[0027] In this embodiment, to optimize the optical path structure and improve the uniformity of illumination, both the second and third total internal reflection surfaces are made of horizontal stripes with an angle of 0 to 30° extending from the light guide surface. The appropriate angle of the horizontal stripes is selected based on actual needs and design to ensure that total internal reflection does not directly emit light during transmission.
[0028] In this embodiment, a V-shaped groove design is used for the groove structure. U-shaped, semi-circular, or other groove structures can also be used depending on actual requirements. The pattern on the fourth reflective surface can be a corn kernel pattern, vertical stripes, horizontal stripes, leather texture, or small dots.
[0029] refer to Figure 4As shown, the light propagation path on the light-emitting surface in this embodiment is roughly as follows: First, the LED light source is collimated by the condenser 30 and incident on the upper boundary of the first reflecting surface 11. The first reflecting surface completely reflects the light to the groove surface 15. Part of the light is reflected by the groove structure to the third reflecting surface 13. The light is completely reflected by the pattern structure of the third reflecting surface 13 to the second reflecting surface 12. Then, it is completely reflected by the second reflecting surface 12 to the fourth reflecting surface 14. Finally, it is completely reflected by the fourth reflecting surface 14 to the light-emitting surface 16 and then emitted.
[0030] refer to Figure 5 As shown, the light propagation path of the middle and lower parts of the light-emitting surface in this embodiment is roughly as follows: First, the LED light source is collimated and emitted through the condenser 30, and incident on the middle and lower boundaries of the low-reflection surface 11. The light is totally reflected by the first reflecting surface 11 and incident on the second reflecting surface 12, or incident on the light-emitting surface parallel to the light guide direction. Among them, the second total reflection surface 12 totally reflects the light to the fourth reflecting surface 14. The light is incident from the fourth reflecting surface 14 to the light-emitting surface 16, and then totally reflected back from the light-emitting surface 16 to the fourth reflecting surface 14. The light is totally reflected multiple times on the fourth reflecting surface 14 and the light-emitting surface 16 until the pattern structure of the fourth reflecting surface 14 causes the total reflection condition to be no longer met, and the light is emitted from the light-emitting surface 16.
[0031] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A uniformly illuminated light guide structure, characterized in that: The light guide body (10) includes a light guide body (10), a light condenser (30) is provided at the bottom of one end of the light guide body (10), an LED light source (20) is provided at the light inlet focal point of the light condenser (30), a first reflective surface (11) with a certain tilt angle is formed on the light guide body (10) directly above the light condenser (30), a groove surface (15) is formed on the upper surface of the middle part of the light guide body (10) near the first reflective surface; a second reflective surface (12) and a third reflective surface (13) are formed on the upper and lower surfaces of the middle part of the light guide body (10) at an angle of 0 to 30° with the light guide extension direction, and a light emitting surface (16) and a fourth reflective surface (14) are formed on the upper and lower surfaces of the right part of the light guide body (10).
2. The uniformly illuminated light guide structure according to claim 1, characterized in that: The light emitted by the LED light source (20) is collimated by the condenser (30) and incident into the light guide body. It first incident on the first reflecting surface (11), where the light is totally reflected by the upper part of the first reflecting surface to the groove surface (15), and then reflected by the groove structure to the third reflecting surface (13). The light is then totally reflected by the third reflecting surface (13) to the second reflecting surface (12); then totally reflected by the second reflecting surface (12) to the fourth reflecting surface (14), and finally reflected by the fourth reflecting surface (14) to the light emitting surface. (16) Light emission: The light rays are totally reflected by the first reflecting surface (11) in the middle and lower part to the second reflecting surface (12) or directly reflected to the light emission surface (16) for light emission. The light rays reflected to the second reflecting surface (12) are then totally reflected to the fourth reflecting surface. The light rays enter the light emission surface (16) from the fourth reflecting surface (14) and are then totally reflected back to the fourth reflecting surface (14). The light rays are totally reflected multiple times on the fourth reflecting surface (14) and the light emission surface (16) and finally emitted uniformly through the light emission surface (16).
3. The uniformly illuminated light guide structure according to claim 1, characterized in that: The first reflective surface (11) is at an angle of 40°-60° to the collimated light output direction of the concentrator (30), and the second reflective surface (12) and the third reflective surface (13) are at an angle of 0° to 30° to the light guide extension direction.
4. The uniformly illuminated light guide structure according to claim 1, characterized in that: The second, third, and fourth reflective surfaces are all patterned surfaces.
5. The uniformly illuminated light guide structure according to claim 1, characterized in that: The second and third reflective surfaces are horizontal stripes.
6. The uniformly illuminated light guide structure according to claim 1, characterized in that: The groove surface (15) is a V-shaped groove, a U-shaped groove, or a semi-circular groove.
7. The uniformly illuminated light guide structure according to claim 1, characterized in that: A row of LED light sources is placed at the focal point of the condenser, so that the light emitted by the LED light sources is collimated and emitted through the condenser.
8. The uniformly illuminated light guide structure according to claim 1, characterized in that: The concentrator is a stretched concentrator, a circular concentrator, an asymmetric concentrator, or a nested concentrator.
9. The uniformly illuminated light guide structure according to claim 1, characterized in that: The concentrator and the light guide are integrated into one unit.
10. A uniformly illuminated light guide structure according to claim 4, characterized in that: The fourth reflective surface pattern is a corn kernel pattern, vertical stripes, horizontal stripes, leather texture, or small dot pattern.