Multi-light-source strip light guide with uniform light effect, optical system and vehicle lamp

Abstract

This utility model discloses a multi-source strip light guide, optical system, and vehicle lamp with uniform light distribution. The uniform light distribution groove of the multi-source strip light guide has multiple alternating stepped light-emitting surfaces and outer wall reflective surfaces symmetrically arranged on both sides of the groove. Similarly, the concentrator has multiple alternating inner wall reflective surfaces and stepped extension surfaces symmetrically arranged on both sides. By employing the above multi-source strip light guide, optical system, and vehicle lamp, not only can the optical unit achieve a very uniform light emission effect along the length direction on the light-emitting plane side, but the entire multi-source strip light guide can also achieve a very uniform light emission effect along the length direction on the light-emitting plane side. Furthermore, it can achieve a very uniform light emission effect along the entire length direction, ensuring extremely high brightness regardless of the length of the vehicle lamp, meeting stringent regulatory requirements. It also has excellent versatility, and can be used as various types of vehicle lamps such as high-mounted brake lights, daytime running lights, and decorative lights.

Description

Technical Field

[0001] This utility model relates to the field of optical element technology, specifically to a multi-source strip light guide with uniform light distribution effect, an optical system, and a vehicle lamp. Background Technology

[0002] Currently, to meet regulatory brightness requirements, most automotive exterior lights, such as high-mounted brake lights and daytime running lights, use multiple LED chips for illumination, typically forming multiple evenly distributed bright spots along the length (the brightest positions are closest to the LED chips). Some automakers desire these exterior lights to achieve a uniform illumination effect along the length (i.e., a uniformly luminous light strip effect) for better visual appeal. However, due to limitations in the structural design of existing light guides, only end-light-intake methods can achieve uniform illumination along the length. But because this method can only accommodate a limited number of LED chips, if the exterior light is long, not only will the overall brightness be low, failing to meet regulatory requirements, but the brightness may also gradually decrease from both ends towards the middle.

[0003] Solving these problems is now a top priority. Utility Model Content

[0004] To address the technical problem of existing long exterior lights struggling to balance brightness and light emission uniformity, this invention provides a multi-source strip light guide, optical system, and vehicle light with uniform light emission effect.

[0005] The technical solution is as follows:

[0006] The first aspect of this application relates to a multi-source strip light guide with a uniform light effect, comprising a long strip-shaped light guide body, which is composed of multiple optical units connected sequentially along the length direction. The optical units are characterized in that: one side surface in the thickness direction of each optical unit is recessed to form a V-shaped groove for uniform light distribution; both sides of the groove have planar light-emitting planes; and both sides of the groove walls are symmetrically provided with multiple alternating stepped light-emitting surfaces and outer wall reflective surfaces. The stepped light-emitting surfaces are all planar structures parallel to the light-emitting planes, and the outer wall reflective surfaces are all inclined surfaces sloping towards the bottom of the groove.

[0007] Each optical unit has a condenser on the other side of its thickness direction that faces the corresponding light-diffusing groove. Both sides of the condenser are symmetrically provided with multiple alternating inner wall reflective surfaces and stepped extension surfaces. The inner wall reflective surfaces are all inclined surface structures that are inclined towards the light-inlet end of the condenser. The stepped extension surfaces are all planar or curved surface structures that connect adjacent inner wall reflective surfaces.

[0008] By employing the above-mentioned multi-source strip light guide with uniform light distribution, for each optical unit, the light entering from the condenser, after being collimated and diffused by the condenser, can be relatively uniformly directed towards each step light-emitting surface and the outer wall reflector. The light rays directed towards the step light-emitting surface are directly transmitted from the step light-emitting surface, while the light rays directed towards the outer wall reflector are reflected by the outer wall reflector and then directed towards one or more corresponding inner wall reflectors, and then reflected by the inner wall reflectors towards the light-emitting plane, and finally transmitted from the light-emitting plane. Through this design, the optical unit can achieve a very uniform light emission effect along the length direction on the light-emitting plane side, thereby enabling the entire multi-source strip light guide to achieve a very uniform light emission effect along the length direction on the light-emitting plane side.

[0009] In some embodiments, the stepped extension surfaces are all planar structures parallel to the light-emitting plane.

[0010] In some implementations, the light-emitting planes of adjacent optical units transition smoothly.

[0011] In some embodiments, the light guide body is integrally formed by injection molding.

[0012] The second aspect of this application relates to an optical system, including the aforementioned multi-source strip light guide and light sources corresponding to each of the light-emitting elements, wherein the light-emitting surface of each light source faces the light-incoming surface of the corresponding light-emitting element.

[0013] The above optical system possesses all the advantages of the aforementioned multi-source strip light guide.

[0014] The third aspect of this application relates to a vehicle lamp, including a lamp housing, a lamp cover, and the aforementioned optical system. The lamp cover covers the lamp housing and together with the lamp housing forms a component mounting cavity. The light sources are all LED beads integrated on a PCBA. The PCBA and the light guide body are both installed in the component mounting cavity, and each light-emitting plane faces the lamp cover.

[0015] The above-mentioned vehicle lights not only possess all the advantages of the multi-light source strip light guides, but also achieve a very uniform light emission effect along the length direction. Regardless of the length of the vehicle lights, they can guarantee extremely high brightness, meet the strict requirements of regulations, and have excellent versatility, and can be used as high-mounted brake lights, daytime running lights, decorative lights and other types of vehicle lights. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the vehicle headlight structure;

[0017] Figure 2 This is a cross-sectional view of the vehicle's headlights;

[0018] Figure 3 This is a schematic diagram of the optical system.

[0019] Figure 4 This is a schematic diagram of a multi-source strip light guide component;

[0020] Figure 5 This is the optical path diagram of the optical unit. Detailed Implementation

[0021] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0022] Example 1:

[0023] like Figures 2-5 As shown, a multi-source strip light guide with uniform light effect mainly includes a light guide body 1 made of a light-transmitting material, which has a long strip structure. The light guide body 1 is composed of multiple optical units 11 connected sequentially along the length direction, that is, each optical unit 11 is connected end to end to form the light guide body 1.

[0024] In this embodiment, the structure of each optical unit 11 is exactly the same. Specifically, one side surface of the optical unit 11 in the thickness direction is recessed to form a light-averaging groove 111 with a V-shaped groove structure. Both sides of the light-averaging groove 111 are provided with light-emitting planes 112 with a planar structure. That is, a light-averaging groove 111 is recessed between the two light-emitting planes 112 of each optical unit 11. The two side walls of the light-averaging groove 111 are generally V-shaped and eventually converge together.

[0025] The two sides of the uniform light distribution groove 111 have a symmetrical structure. Specifically, the two sides of the uniform light distribution groove 111 are symmetrically provided with multiple alternating stepped light-emitting surfaces 113 and outer wall reflective surfaces 114. The stepped light-emitting surfaces 113 are all planar structures parallel to the light-emitting plane 112, and the outer wall reflective surfaces 114 are all inclined surfaces that are inclined towards the bottom of the uniform light distribution groove 111. That is, for a pair of opposite outer wall reflective surfaces 114, the distance between the two outer wall reflective surfaces 114 gradually decreases towards the bottom of the uniform light distribution groove 111.

[0026] Meanwhile, on the other side surface of the optical unit 11 in the thickness direction, there are condensers 115 facing the corresponding light-diffusing groove 111. The function of the condensers 115 is to collimate, diffuse and brighten, so that the incoming light is distributed as evenly as possible on the light-emitting surface 113 of each step of the corresponding light-diffusing groove 111 and the outer wall reflective surface 114.

[0027] On both sides of the concentrator 115, there are multiple alternating inner wall reflective surfaces 116 and stepped extension surfaces 117 arranged symmetrically. The stepped extension surfaces 117 are all planar or curved structures connecting adjacent inner wall reflective surfaces 116. The inner wall reflective surfaces 116 are all inclined structures that are inclined towards the light-inlet end of the concentrator 115. That is, for a set of opposing inner wall reflective surfaces 116, the distance between the two inner wall reflective surfaces 116 gradually decreases in the direction away from the opening of the light-diffusing groove 111.

[0028] Therefore, for each optical unit 11, the light entering from the condenser 115, after being collimated and diffused by the condenser, can be relatively uniformly directed towards each stepped light-emitting surface 113 and outer wall reflective surface 114 of the optical unit 11. The light rays directed towards the stepped light-emitting surface 113 are directly transmitted through the stepped light-emitting surface 113, while the light rays directed towards the outer wall reflective surface 114 are reflected by the outer wall reflective surface 114 and then directed towards one or more corresponding inner wall reflective surfaces 116, and then reflected by the inner wall reflective surface 116 towards the light-emitting plane, and finally transmitted through the light-emitting plane 112. Through this design, the optical unit 11 can achieve a very uniform light emission effect along the length direction on one side of the light-emitting plane 112, thereby enabling the entire multi-source light-emitting strip light guide to achieve a very uniform light emission effect along the length direction on one side of the light-emitting plane 112, that is, to achieve a uniform light-emitting band effect.

[0029] It should be noted that the more light-emitting surfaces 113, outer wall reflective surfaces 114, inner wall reflective surfaces 116, and step extension surfaces 117 per unit area (theoretically, there can be an infinite number), the higher the light emission uniformity of the optical unit 11 in the length direction.

[0030] Furthermore, the stepped extension surface 117 is preferably a planar structure parallel to the light-emitting plane 112, so that the stepped extension surface 117 only serves as an extension structure, minimizing the transmission of optics from the stepped extension surface 117, thereby improving the luminous brightness of the multi-source strip light guide on one side of the light-emitting plane 112.

[0031] Furthermore, the adjacent light-emitting planes 112 between adjacent optical units 11 are smoothly transitioned, that is, the adjacent light-emitting planes 112 between adjacent optical units 11 together form a large screen, which can further improve the light emission uniformity of the multi-source strip light guide on one side of the light-emitting plane 112.

[0032] Furthermore, the light guide body 1 is integrally formed by injection molding, which can further improve the light emission uniformity of the multi-source strip light guide on one side of the light emission plane 112. In this embodiment, the material of the light guide body 1 is preferably PC or PMMA, which is inexpensive and durable.

[0033] Please see Figure 5The concentrator 115 includes a ring-shaped rib 115b, which encloses a light-entry channel. The inner end of the light-entry channel has a first incident surface 115a1, which is an aspherical or free-form surface. The circumferential sidewall of the light-entry channel is a second incident surface 115a2. The first incident surface 115a1 and the second incident surface 115a2 together constitute the light-entry surface 115a of the concentrator 115. The circumferential outer wall of the rib 115b is a light-entry reflective surface 115b1. Therefore, light rays incident from the first incident surface 115a1 are refracted by the first incident surface 115a1 and then directed towards the corresponding stepped light-exiting surface 113 or the outer wall reflective surface 114. Light rays incident from the second incident surface 115a2 are refracted by the second incident surface 115a2 and then reflected by the light-entry reflective surface 115b1 before being directed towards the corresponding stepped light-exiting surface 113 or the outer wall reflective surface 114. This design significantly improves the light intake efficiency of the concentrator 115, eliminating the need to increase the power of the LED lamp assembly to ensure luminous efficacy and brightness, thus indirectly reducing product costs.

[0034] Example 2:

[0035] Please see Figure 2 and Figure 3 An optical system includes a multi-source strip light guide as described in Embodiment 1 and light sources 21 corresponding to each of the condensers 115. The emitting surface of each light source 21 faces the light-receiving surface 115a of the corresponding condenser 115. The light source 21 can be an LED bead or a conventional light source such as a small light bulb.

[0036] It is necessary to ensure that the center line of the light-emitting surface of the light source 21 coincides with the center line of the light-inlet surface 115a of the corresponding concentrator 115, so that as much light as possible can enter the concentrator 115 and improve the brightness.

[0037] Example 3:

[0038] Please see Figure 1 and Figure 2 A vehicle lamp includes a lamp housing 3, a lamp cover 4, and an optical system as described in Embodiment 2. The lamp cover 4 covers the lamp housing 3, and the lamp cover 4 and the lamp housing 3 together form a component mounting cavity. In this embodiment, the light source 21 is preferably an LED bead integrated on a PCBA2. The PCBA2 and the light guide body 1 are both installed in the component mounting cavity. Each light-emitting plane 112 faces the lamp cover 4. The lamp cover 4 is made of a light-transmitting material and can transmit light.

[0039] Therefore, the lamp cover 4 in this embodiment can achieve a very uniform light emission effect along its length, ensuring extremely high brightness regardless of the length of the vehicle lamp, meeting stringent regulatory requirements. It also boasts excellent versatility, capable of being used as a high-mounted brake light, daytime running light, decorative light, and other types of vehicle lamps. In particular, the uniform light distribution groove 111 adopts a V-shaped groove structure, with the distance from the lamp cover 4 increasing towards the center (closer to the LED beads). This avoids high brightness issues at the corresponding LED bead positions on the lamp cover 4, ensuring high uniformity of illumination for the lamp cover 4.

[0040] Furthermore, the lamp housing 3 is preferably made of opaque plastic material (such as black plastic) to avoid light leakage problems.

[0041] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model. Those skilled in the art, under the guidance of the present utility model, can make various similar representations without departing from the spirit and claims of the present utility model, and such modifications all fall within the protection scope of the present utility model.

Claims

1. A multi-light source strip light guide having a uniform light effect, comprising a long strip-shaped light guide body composed of a plurality of optical units connected in sequence along the length direction, characterized in that: One side surface of the optical unit in the thickness direction is recessed to form a V-shaped groove for light distribution. Both sides of the light distribution groove are provided with planar light-emitting planes. The two sides of the groove wall are symmetrically provided with multiple alternating stepped light-emitting surfaces and outer wall reflective surfaces. The stepped light-emitting surfaces are all planar structures parallel to the light-emitting planes, and the outer wall reflective surfaces are all inclined surfaces that are inclined towards the bottom of the light distribution groove. Each optical unit has a condenser on the other side of its thickness direction that faces the corresponding light-diffusing groove. Both sides of the condenser are symmetrically provided with multiple alternating inner wall reflective surfaces and stepped extension surfaces. The inner wall reflective surfaces are all inclined surface structures that are inclined towards the light-inlet end of the condenser. The stepped extension surfaces are all planar or curved surface structures that connect adjacent inner wall reflective surfaces.

2. The multi-light source strip light guide with uniform light effect according to claim 1, characterized in that: The extended surfaces of the steps are all planar structures parallel to the light-emitting plane.

3. The multi-light source strip light guide with uniform light effect of claim 1, wherein: The light-emitting planes of adjacent optical units transition smoothly.

4. The multi-source bar light guide with uniformity effect according to claim 1, wherein: The light guide body is integrally formed by injection molding.

5. An optical system characterized by: The invention includes a multi-source strip light guide as described in any one of claims 1-4 and light sources corresponding to each of the light concentrators, wherein the light-emitting surface of each light source faces the light-incoming surface of the corresponding light concentrator.

6. A vehicle lamp characterized by: The system includes a lamp housing, a lamp shade, and the optical system described in claim 5. The lamp shade covers the lamp housing and together with the lamp housing forms a component mounting cavity. The light sources are all LED beads integrated on the PCBA. The PCBA and the light guide body are both installed in the component mounting cavity, and each light-emitting plane faces the lamp shade.

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