Large-angle light distribution automobile ground lamp based on single light guide freeform surface
Patent Information
- Application Number
- CN202522285541.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-29
- Publication Date
- 2026-08-28
- Estimated Expiration
- 2035-10-29
AI Technical Summary
[0004]本实用新型目的在于提供一种基于单光导自由曲面的大角度光分布汽车照地灯,以解决在汽车照明领域汽车照地灯一直存在难以在有限的安装空间与功耗约束下，同时实现大照射范围、高照度的均匀光照效果的技术问题
[0011]本实用新型一种基于单光导自由曲面的大角度光分布汽车照地灯具有以下优点：本照地灯的光学系统由高度集成的光导透镜构成，零件数量少，体积减小，适用于狭小空间的安装；通过光导透镜非球面或复合曲面设置的入光面第一光学面对LED芯片发出的光进行高效集光，最大限度的减少光能浪费；通过光导透镜自由曲面设置的出光面第二光学面对光线进行精准分布照射，实现大面积的照射面积，同时避免了亮斑及暗区的产生，增加照度均匀性；通过在光导透镜或饰圈上设置的多个定位柱与印刷电路板上定位孔的精密配合，实现了光学元件与LED芯片在三维空间上的精准对位，从机械结构上保证了光学系统安装的便捷性及光导透镜与LED芯片之间的精密配合；通过饰圈对光导透镜进行限制并精准定位，通过饰圈喇叭口反光面的辅助集光作用，最大限度地减少了侧向漏光，将光导透镜发出的光导出并充分用于有效照明。
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Figure CN224694357U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of automotive lighting technology, and in particular relates to a large-angle light distribution automotive ground lamp based on a single light guide freeform surface. Background Technology
[0002] Car ground lights are a common and important lighting function in modern vehicles, effectively improving the convenience of getting in and out of the car and enhancing vehicle brand recognition. Currently, there are two main technical solutions for effectively illuminating large areas of the ground. The first is a single LED light combined with a simple optical lens. This solution is simple in structure and low in cost, but the simple lens has limited control over light, resulting in a narrow light-emitting angle, a small light-forming area, poor illuminance uniformity, and noticeable light spots, making it difficult to meet the requirements for high-precision, large-area ground illumination or projection. The second is multiple LED lights combined with multiple light guides or complex reflectors. This expands the illumination area by increasing the number of light sources and optical components. However, multiple LED lights significantly increase system power consumption and heat generation, and the optical system becomes complex and bulky, which contradicts the trend of low power consumption in automotive electronics.
[0003] Therefore, in the field of automotive lighting, automotive puddle lights have always faced the challenge of achieving a large illumination range and high illuminance uniform illumination effect under the constraints of limited installation space and power consumption. Utility Model Content
[0004] The purpose of this invention is to provide a large-angle light distribution automotive ground lamp based on a single light guide freeform surface, in order to solve the technical problem that automotive ground lamps have always faced in the field of automotive lighting, which is difficult to achieve a uniform lighting effect with a large illumination range and high illuminance under the constraints of limited installation space and power consumption.
[0005] To achieve the above objectives, the specific technical solution of this utility model for a large-angle light distribution automotive ground lamp based on a single optical guide freeform surface is as follows: A large-angle light distribution automotive ground light based on a single freeform surface includes a housing; a printed circuit board (PCB) fixedly disposed within the housing; an LED chip disposed on the PCB; and a light guide lens, made of a light-transmitting material, disposed on the light-emitting path of the LED chip on the PCB. The light guide lens includes a first optical surface close to the LED chip and a second optical surface distant from the LED chip. The first optical surface is the light-incident surface, and its structure is an aspherical or composite curved surface for collecting light. The second optical surface is the light-exit surface, and its structure is an irregular freeform surface. At least two positioning posts are disposed on the side of the light guide lens close to the PCB. Positioning holes are disposed on the PCB, corresponding to the positions of the positioning posts. The positioning posts and positioning holes achieve precise three-dimensional positioning between the light guide lens, the PCB, and the LED chip through interference fit or clearance fit.
[0006] Furthermore, a decorative ring is provided around the light guide lens for fixing the light guide lens; at least two positioning posts are provided on the side of the decorative ring close to the printed circuit board; positioning holes are provided on the printed circuit board opposite to the positioning posts; the positioning posts and positioning holes achieve precise positioning of the decorative ring and the printed circuit board through interference fit or clearance fit, thereby accurately setting the light guide lens in a preset position through the decorative ring.
[0007] Furthermore, the decorative ring extends outward in a funnel shape near the position of the light guide lens, and its inner surface is a reflective surface.
[0008] Furthermore, the surface curvature of the second optical freeform surface changes continuously, and its surface shape is optimized using ray tracing simulation software.
[0009] Furthermore, the outer casing is provided with an outer cover in the direction of the light-emitting surface of the light guide lens.
[0010] Furthermore, the outer cover can be configured as a microstructured mask with features such as frosted or striped textures, depending on requirements.
[0011] This utility model discloses a large-angle light distribution automotive puddle based on a single freeform surface of a light guide, which has the following advantages: The optical system of this puddle consists of a highly integrated light guide lens, with fewer parts and a smaller size, making it suitable for installation in confined spaces; the first optical surface of the light guide lens, set with an aspherical or composite curved surface, efficiently collects the light emitted from the LED chip, minimizing light energy waste; the second optical surface of the light guide lens, set with a freeform surface, precisely distributes the light, achieving a large illumination area while avoiding bright spots and dark areas, increasing illuminance uniformity; the precise fit between multiple positioning posts on the light guide lens or decorative ring and positioning holes on the printed circuit board ensures precise alignment of the optical element and the LED chip in three-dimensional space, guaranteeing the ease of installation of the optical system and the precise fit between the light guide lens and the LED chip from a mechanical structure perspective; the decorative ring restricts and precisely positions the light guide lens, and the auxiliary light-collecting effect of the reflective surface of the decorative ring's flared opening minimizes lateral light leakage, guiding the light emitted from the light guide lens and fully utilizing it for effective illumination. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model in the form of an explosion. Figure 2 This is a schematic diagram of the cross-sectional effect of the installation structure of this utility model; Figure 3 This is a schematic cross-sectional view of the decorative ring mounting structure of this utility model. The markings in the diagram are as follows: 1. Outer casing; 2. Printed circuit board; 3. LED chip; 4. Light guide lens; 5. Positioning post; 6. Positioning hole; 7. Decorative ring; 8. Outer cover. Detailed Implementation
[0013] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of a large-angle light distribution automotive ground lamp based on a single light guide freeform surface.
[0014] like Figure 1-3 As shown, this utility model discloses a large-angle light distribution automotive ground light based on a single light guide freeform surface, comprising a housing 1; a printed circuit board 2, fixedly disposed within the housing 1; an LED chip 3 disposed on the printed circuit board 2; and a light guide lens 4, made of a light-transmitting material, disposed on the light-emitting path of the LED chip 3 on the printed circuit board 2. The light guide lens 4 includes a first optical surface close to the LED chip 3 and a second optical surface distant from the LED chip 3. The first optical surface is the light-incident surface, and its structure is an aspherical or composite curved surface for collecting light. The second optical surface is the light-exit surface, and its structure is an irregular freeform surface. At least two positioning posts 5 are disposed on the side of the light guide lens 4 close to the printed circuit board 2. The printed circuit board 2 is provided with positioning holes 6 opposite to the positions of the positioning posts 5. The positioning posts 5 and the positioning holes 6 achieve precise three-dimensional positioning between the light guide lens 4, the printed circuit board 2, and the LED chip 3 through interference fit or clearance fit.
[0015] Combination Figure 1-3 As shown, the outer shell 1 of this ground light serves as the mechanical support and mounting carrier for the entire lamp. The printed circuit board 2 is fixed in the inner cavity of the outer shell 1 by common connection methods such as screws or clips. An LED chip 3 is soldered on the printed circuit board 2 as the light source for the ground light. In another alternative embodiment, two LED chips 3 can be soldered on the printed circuit board 2 to achieve higher brightness. The light guide lens 4, as the core optical element of this ground light, is made of light-transmitting material and integrally molded by injection molding. It is positioned above the printed circuit board 2, with its optical axis opposite to the central light-emitting path of the LED chip 3.
[0016] The light guide lens 4 includes a first optical surface close to the LED chip 3 inside and a second optical surface far away from the LED chip 3 outside. The first optical surface is the light-incident surface, which is designed as an aspherical or composite curved surface. It can efficiently collect large-angle light emitted by the LED chip 3 and converge it into the interior of the light guide lens 4, effectively reducing light leakage loss on the light source side. The second optical surface is the light-exit surface, which is designed as an irregular free-form surface. It deflects, scatters and redistributes the light introduced by the first optical surface in a single optical element, thereby directly projecting a large area of light spot with a preset shape and highly uniform illumination onto the target ground without the need for other optical paths or optical elements.
[0017] The light guide lens 4 has two or more cylindrical positioning posts 5 on one side of the printed circuit board 2. The printed circuit board 2 has positioning holes 6 that are opposite in position and corresponding in size to the positioning posts 5. When assembling the printed circuit board 2 and the light guide lens 4, the multiple positioning posts 5 are inserted into the corresponding positioning holes 6. By using an interference fit or a precise clearance fit, the light guide lens 4 is fixed to the printed circuit board 2, and the three-dimensional spatial positioning between the light guide lens 4 and the printed circuit board 2 is achieved. This ensures that the optical center of the light guide lens 4 is aligned with the center light emission path of the LED chip 3, and avoids the distortion of the light rays or the appearance of bright spots or dark areas due to assembly errors. At the same time, the setting of positioning posts 5 and positioning holes 6 can ensure the consistency of the optical performance of the product in mass production.
[0018] The surface curvature of the second optical surface, a freeform surface, changes continuously. Its shape is optimized and designed using ray tracing simulation software. The freeform surface breaks the limitations of traditional regular curved surfaces such as spheres and aspherical surfaces in optical design. By customizing the curvature of each point on the surface, incident light can be guided to a preset target position to achieve wide-range illumination. At the same time, by designing and optimizing the shape of the freeform surface, bright spots in the center of the illumination and dark areas at the edges are eliminated to ensure the uniformity of illumination.
[0019] like Figure 3As shown, a decorative ring 7 is provided around the optical guide lens 4 for fixing the optical guide lens 4; at least two positioning posts 5 are provided on the side of the decorative ring 7 near the printed circuit board 2; the printed circuit board 2 is provided with positioning holes 6 opposite to the positioning posts 5; the positioning posts 5 and the positioning holes 6 achieve precise positioning of the decorative ring 7 and the printed circuit board 2 through interference fit or clearance fit, and then the optical guide lens 4 is precisely set in the preset position by the decorative ring 7. The positioning posts 5 on the decorative ring 7 and the positioning holes 6 on the printed circuit board 2 are precisely matched, firstly achieving precise positioning of the decorative ring 7 itself and the circuit board, and then fixing and constraining the optical guide lens 4 by the precisely positioned decorative ring 7, forming a positioning path of "circuit board-decorative ring 7-optical guide lens 4". The decorative ring 7 provides additional radial support and protection for the optical guide lens 4, increasing the shock resistance of the optical guide lens 4. At the same time, by setting the positioning structure on the decorative ring 7 instead of the optically complex optical guide lens 4, the requirements for the processing strength and processing accuracy of the optical guide lens 4 can be reduced, simplifying mold design and injection molding process, and reducing production costs.
[0020] The decorative ring 7 extends outward in a funnel shape near the light guide lens 4, and its inner surface is a reflective surface. By setting the reflective surface, the decorative ring 7 forms a reflective cup, which can effectively collect the scattered light emitted through the light guide lens 4 and guide it to the illuminated area, reduce system light leakage, and enhance the illuminance and uniformity of the ground light spot.
[0021] like Figure 1 As shown, the outer casing 1 is provided with an outer cover 8 in the direction of the light-emitting surface of the light guide lens 4. The cooperation between the outer cover 8 and the outer casing 1 provides physical protection for the internal precision printed circuit board 2 and light guide lens 4, achieving the effects of dustproof and waterproof, and improving the overall service life of this ground lamp.
[0022] The outer cover 8 can be configured as a microstructure mask with features such as frosted or striped textures. By setting microstructures such as frosted or striped textures, the initial light spot formed by the light guide lens 4 can be optimized, blurring any possible microscopic optical defects, making the ground light softer and more uniform, and playing an auxiliary role in enhancing the visual experience.
[0023] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.
Claims
1. A large-angle light distribution automotive ground lamp based on a single optical guide freeform surface, characterized in that, The device includes a housing (1); a printed circuit board (2) fixedly disposed inside the housing (1); an LED chip (3) disposed on the printed circuit board (2); and a light guide lens (4) made of light-transmitting material disposed on the light-emitting path of the LED chip (3) on the printed circuit board (2). The light guide lens (4) includes a first optical surface close to the LED chip (3) and a second optical surface far from the LED chip (3). The first optical surface is the light-incident surface, and its structure is an aspherical or composite curved surface for collecting light. The second optical surface is the light-exit surface, and its structure is an irregular free-form surface. At least two positioning posts (5) are disposed on the side of the light guide lens (4) close to the printed circuit board (2). The printed circuit board (2) is provided with positioning holes (6) opposite to the positions of the positioning posts (5). The positioning posts (5) and the positioning holes (6) are precisely positioned in three dimensions between the light guide lens (4), the printed circuit board (2), and the LED chip (3) through interference fit or clearance fit.
2. The automotive ground light with large-angle light distribution based on a single optical guide freeform surface according to claim 1, characterized in that, The light guide lens (4) is surrounded by a decorative ring (7) for fixing the light guide lens (4); at least two positioning posts (5) are provided on the side of the decorative ring (7) close to the printed circuit board (2); the printed circuit board (2) is provided with positioning holes (6) opposite to the positioning posts (5); the positioning posts (5) and the positioning holes (6) achieve precise positioning of the decorative ring (7) and the printed circuit board (2) through interference fit or clearance fit, thereby accurately setting the light guide lens (4) in a preset position through the decorative ring (7).
3. A large-angle light distribution automotive ground lamp based on a single optical guide freeform surface according to claim 2, characterized in that, The decorative ring (7) extends outward in a trumpet shape near the optical guide lens (4), and its inner surface is a reflective surface.
4. A large-angle light distribution automotive ground lamp based on a single optical guide freeform surface according to claim 1, characterized in that, The surface curvature of the second optical freeform surface changes continuously, and its surface shape is optimized using ray tracing simulation software.
5. A large-angle light distribution automotive ground lamp based on a single optical guide freeform surface according to claim 1, characterized in that, The outer casing (1) is provided with an outer cover (8) in the direction of the light-emitting surface of the light guide lens (4).
6. A large-angle light distribution automotive ground lamp based on a single optical guide freeform surface according to claim 5, characterized in that, The outer cover (8) can be configured as a microstructured mask with features such as frosted or striped textures, depending on requirements.