Thick-wall light guide and vehicle lamp
By designing a wall-thick light guide structure with multiple reflections in the signal light guide, the light path forms a roundabout circuit in the light guide, solving the deep problem caused by excessive length of the existing light guide, and achieving shorter lateral length and good uniformity.
Patent Information
- Application Number
- CN202421023045.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-05-13
AI Technical Summary
The existing light guides used on signal lights need to meet uniformity due to the design needs to meet uniformity, resulting in a longer section of light emitted by the light guide, which occupies a lot of horizontal space, making the entire signal light deeper and larger, contrary to the flat and lighter headlights. Quantitative design trends.
A wall-thick light guide is designed to make the light path reflect multiple times in the light guide before being emitted, increasing the distance of the light path in the light guide, and using multiple reflections to achieve uniform light performance, thereby shortening the lateral length of the light guide. The specific solution includes setting two or more reflective surfaces in the light guide, so that the optical path can be reflected through all reflective surfaces and formed a roundabout cross circuit, ensuring that the optical paths are basically emitted.
By increasing the optical path, the lateral length of the light guide is reduced while maintaining uniform performance, thereby solving the deep problems caused by excessive light guides in the prior art, which is in line with the trend of flattening and lightweight design of the car light.
Smart Images
Figure CN222480266U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical elements, in particular to a wall-thickness light guide and a vehicle lamp. Background Art
[0002] Light guides are light-guiding elements used in the field of optics. Their function is to make the light path shine in a certain direction as much as possible and have the effect of uniform light, thereby maximizing the utilization of light energy. The reflective surface set on the light guide can change the path of the light path, and the diffusion pattern set on the reflective surface also helps to make the light path uniform.
[0003] In the field of automotive lighting, because thick-walled parts have high efficiency, high uniformity and high-end feel, more and more cars are using thick-walled light guides in signal lights. In order to take into account the aesthetics and prevent the circuit board and LED lamp from being exposed, the thick-walled light guide is usually designed as an L-shaped structure. The light path enters from one end of the light guide, is reflected by the reflective surface set at the corner, and then emitted from the other end.
[0004] However, existing light guides used in signal lights have defects: in order to ensure the uniformity of the signal light, the section of the light guide that emits light is usually designed to be longer, occupying more horizontal space, making the entire signal light deeper and heavier, which goes against the design trend of flat and lightweight headlights. Utility Model Content
[0005] Based on the defects described in the background technology, the present application provides a thick-walled light guide, which proposes a new solution to make the light path form multiple reflections inside the light guide before being emitted. In this way, the distance of the light path inside the light guide is increased, and the light uniforming performance of the light guide can be utilized multiple times, thereby avoiding the defect of the light guide being too long laterally.
[0006] Specifically, while reducing the transverse length of the light guide, the reflective surface cannot affect the light emitting area. Therefore, the present solution proposes that the light guide includes two or more reflective surfaces, so that the light path entering the light guide can be emitted after being reflected by all the reflective surfaces to form a ring-shaped cross loop, that is, the reflective surfaces are arranged one by one at the corner points of the ring loop until the light path forms a ring and intersects with the incident light. At this time, any reflective surface will not block the light path, so that basically all the light paths are emitted from the light guide;
[0007] The light guide arranged in this way can be shorter in the lateral direction due to the longer light path while achieving the same uniform performance, thereby solving the defects of the prior art.
[0008] Preferably, a diffusion pattern is provided on the reflective surface, and the diffusion pattern is used to further make the light path uniform. If the diffusion patterns are provided on multiple reflective surfaces, the uniform light effect will be further improved, and the lateral length of the light guide will be further shortened.
[0009] Preferably, the light guide further comprises a collimator, which is arranged at the light entrance of the light guide and is used to collimate the light path incident on the light guide so that the collimated light path is then directed toward the reflective surface.
[0010] Preferably, the light guide further comprises a light emitting surface, so that the light reflected by all the reflecting surfaces is emitted out of the light guide through the light emitting surface.
[0011] Preferably, a diffusion pattern is provided on the light emitting surface to further make the light path of the light guide even.
[0012] Preferably, there are three reflecting surfaces, namely the first reflecting surface, the second reflecting surface and the third reflecting surface arranged in sequence along the square outline. The collimation direction of the collimator forms an angle of 45° with the first reflecting surface, so that the light path emitted through the third reflecting surface is perpendicular to the collimation direction of the collimator.
[0013] In other embodiments, there may be two, four or more reflective surfaces. As long as the light path can form a ring-shaped loop after passing through the plurality of reflective surfaces, it is a solution that needs to be protected by the present utility model.
[0014] Preferably, the present application also provides a vehicle lamp, comprising the aforementioned thick-walled light guide. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0016] Figure 1 This is a schematic structural diagram of a thick-walled light guide in Example 1 of the utility model;
[0017] Figure 2 It is a three-dimensional diagram of the wall thickness light guide of a signal lamp in an embodiment of the utility model;
[0018] Figure 3 It is a simulation diagram of the light emission of the light guide in Examples 1 to 4 of the utility model;
[0019] Figure 4 It is a simulation diagram of the light emission of the light guide in comparative examples 1 to 4 of the present utility model;
[0020] In the figure:
[0021] Light entry section 1;
[0022] Light emitting section 2, light emitting surface 21;
[0023] Reflection section 3, first reflection surface 31, second reflection surface 32, third reflection surface 33;
[0024] Collimator 4. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] Embodiment: This embodiment provides an optimal implementation scheme of a thick-walled light guide, which is described by taking the application of the light guide in a signal lamp as an example.
[0027] Specifically, Figure 1 The light guide has a light input section 1 and a light output section 2. The light input section 1 and the light output section 2 follow the traditional structure. The two are integrally formed and have an L-shaped structure. Different from the traditional solution, the light guide also has a reflection section 3. The reflection section 3 is a basically square structure. One surface of the square structure is integrally connected with the corner of the L-shaped structure, and the other three surfaces of the square structure are used as reflection surfaces, so that the light path entering the light input section 1 can form a square ring-shaped cross loop after being reflected by all the reflection surfaces, and is emitted to the light output section 2, and then emitted through the light output section 2, thereby achieving a significant increase in the length of the light path.
[0028] Further, such as Figure 1 The light guide also includes a collimator 4, which is used to collimate the light path entering the light guide so that the collimated light path is then directed to the reflecting surface.
[0029] Further, such as Figure 1 The three reflections are the first reflection surface 31, the second reflection surface 32 and the third reflection surface 33 arranged in sequence along the square outline. The collimation direction of the collimator 4 forms an angle of 45° with the first reflection surface 31, so that the light path is collimated by the collimator 4 and then emitted to the first reflection surface 31, the first reflection surface 31 is reflected and then emitted to the second reflection surface 32, the second reflection surface 32 is reflected and then emitted to the third reflection surface 33, and the light path emitted from the third reflection surface 33 intersects with the incident light path and then emits to the light emitting section 2, so that the light path emitted from the third reflection surface 33 is perpendicular to the collimation direction of the collimator 4, and the same effect as the traditional signal light is achieved in appearance.
[0030] Furthermore, each reflective surface is provided with a diffusion pattern in the shape of corn kernels.
[0031] Further, such as Figure 1 The light guide also includes a light emitting surface 21, which is arranged on an end surface of the light emitting section 2 away from the light incident section 1, so that the light path reflected by all the reflection surfaces is emitted from the light guide through the light emitting surface 21.
[0032] Furthermore, a diffusion pattern is also provided on the light emitting surface 21 .
[0033] Further, such as Figure 2 In this signal light, there are five light sources and five collimators 4, and the light guides corresponding to the five collimators 4 are integrally formed.
[0034] Furthermore, the total length of the light guide is 40 mm.
[0035] Embodiments 2 to 4: Embodiments 2 to 4 also provide thick-walled light guides, which differ from Embodiment 1 in that the total lengths of the light guides are 35 mm, 30 mm, and 25 mm, respectively.
[0036] Comparative Examples 1-4: Comparative Examples 1-4 provide light guide structures in traditional signal lights, and their total lengths are 40 mm, 35 mm, 30 mm, and 25 mm, respectively.
[0037] The light emission of the light guides in Examples 1 to 4 and Comparative Examples 1 to 4 was simulated, and the results were respectively Figure 3~4 , Figure 3~4 Each light guide has a corresponding light emission condition below it. Figure 3 It can be seen that within the range of 25 to 40 mm, the light guides in Examples 1 to 4 emit light uniformly without obvious graininess. Figure 4 It can be seen that in the range of 25~40mm, when the total length of the light guide in Examples 1~4 is below 40mm, obvious uneven brightness or granularity can be seen, and the defect will become more obvious as the depth of the thick-walled parts decreases. It can be seen that the solution proposed by the present invention has better uniformity than the traditional solution.
[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0039] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A thick-walled light guide, characterized in that: The light guide includes two or more reflective surfaces, so that the light path entering the light guide can be reflected by all the reflective surfaces to form a circular cross loop and then emitted; The reflective surface is provided with a diffusion pattern; The light guide further comprises a collimator, and the collimator is used to collimate the light path incident on the light guide so that the collimated light path is then incident on the reflective surface; The light guide further comprises a light emitting surface, so that the light path reflected by all the reflecting surfaces is emitted from the light guide through the light emitting surface; The light emitting surface is provided with a diffusion pattern; There are three reflecting surfaces, namely a first reflecting surface, a second reflecting surface and a third reflecting surface arranged in sequence along a square outline. The collimation direction of the collimator forms an angle of 45° with the first reflecting surface, so that the light path emitted through the third reflecting surface is perpendicular to the collimation direction of the collimator.
2. A vehicle lamp, characterized in that: A thick-walled light guide comprising the one described in claim 1.