Thick-wall light guide device of automobile tail lamp

Abstract

A thick-wall light guide device of an automobile tail lamp comprises a light source, a thick-wall piece with a light inlet face and a light outlet face, a reflecting face arranged on the light inlet face and a diffusion layer which is arranged on the light outlet face and refracts light in different directions. Light emitted by the light source is reflected by the reflecting surface, enters the thick-wall piece from the light-in surface, is emitted from the light-out surface, and is refracted towards different directions through the diffusion layer; the diffusion layer is provided with a bright layer, the bright layer comprises a plurality of bright units which are distributed on the diffusion layer at intervals, and the bright units are in the shape of a plurality of thin and long strips and are combined in the inclined direction or the longitudinal and transverse directions; according to the automobile tail lamp, the automobile tail lamp can provide large-area irradiation, meanwhile, irradiation display of specific modeling patterns can be achieved, the modeling patterns can be observed from multiple angles, and the intensity of light rays directly emitted from the bright layer is larger than that of light rays refracted from the refraction layer; therefore, the edge of the modeling pattern is softer, the light and shade difference is small, and the visual effect is better.

Description

Technical Field

[0001] The invention relates to the technical field of automobile taillights, and in particular to a thick-walled light guide device for an automobile taillight. Background Art

[0002] At present, light guides are an important optical component used in vehicle taillight systems. Their main function is to effectively transmit and disperse the light emitted by the light source to achieve good visual effects and safety. Light guides are usually made of transparent plastic or glass materials, which have excellent optical properties and weather resistance. Its structural feature is a thicker wall, which not only enhances the strength of the light guide, but also effectively reduces the scattering loss of light. The working principle of light guides is based on the phenomenon of total reflection. When the light emitted by the light source enters the light guide, the light will be totally reflected on the inner wall of the light guide because the refractive index inside the light guide is higher than the external environment, and then propagate along the light guide. By reasonably designing the shape and size of the light guide, different light distribution effects can be achieved to meet the design requirements of the taillight. Light guides can provide uniform light output, avoid bright spots or dark areas that may appear in traditional taillights, and improve the visibility of the taillights.

[0003] The existing designs of light guides are mostly covered with patterns for refracting and diffusing light on the light-emitting surface of the light guides. When the light passes through these refractive patterns, it will be refracted and dispersed to form a large irradiation area. The advantage of this type of light guide is that the light irradiation covers a large area, and even after refraction and diffusion, the light brightness can be maintained uniform. However, the disadvantage is that since the light has undergone diffuse refraction, the light intensity is greatly weakened, and since the refraction and diffusion of light is multi-angle, it is impossible to illuminate and display specific patterns, and cannot meet the diverse and personalized needs of automobile taillights. In summary, a new thick-walled light guide device for automobile taillights is needed to overcome the above-mentioned shortcomings. Summary of the invention

[0004] The present invention aims to solve the problems existing in the above-mentioned prior art and provides a thick-walled light guide device for automobile taillights. A diffusion layer for refracting and diffusing light is arranged on the light-emitting surface of the light guide, and a bright layer for directly emitting light is opened on the diffusion layer. The bright layer is provided with a variety of patterns, and the light refracted and diffused by the diffusion layer covers the light emitted from the bright layer.

[0005] The present invention adopts a technical solution to solve its technical problems: the thick-walled light guide device of the automobile taillight comprises a light source, a thick-walled member having a light incident surface and a light emitting surface, a reflective surface arranged on the light incident surface, and a diffusion layer arranged on the light emitting surface and refracting the light in different directions. The light emitted by the light source is reflected by the reflective surface, enters the thick-walled member from the light incident surface, and is emitted from the light emitting surface, and is refracted in different directions through the diffusion layer; a bright layer is formed on the diffusion layer, and the bright layer comprises a plurality of bright units spaced apart on the diffusion layer, and the bright units are in the shape of a plurality of slender strips and are combined with each other in an inclined direction or in a longitudinal and transverse direction; the diffusion layer is in a plane covering shape.

[0006] For further improvement, the thick-walled part is flat up and down and long and wide left and right. The diffusion layer covers the light-emitting surface. The diffusion layer corresponds to the shape of the thick-walled part and forms a long strip that is narrow up and down and long left and right.

[0007] Further improvement, the diffusion layer is a pattern structure arranged obliquely in different directions, the pattern structure protrudes outward on the light emitting surface, and the pattern structure refracts the light in different directions.

[0008] Further improvement, the bright layer has a smooth surface and is made of a transparent material, and the bright layer is relatively concave inwardly of the diffusion layer.

[0009] Further improvement, the bright unit includes a plurality of straight thin strips, the inner ends of the thin strips are connected and extend in different directions; there are a plurality of bright units and they are distributed at intervals in the middle area of ​​the diffusion layer, and the pattern structure of the diffusion layer is a flat covering shape.

[0010] Further improvement, the angles between the light unit strips are set to enable the area between the light unit strips to be more than twice the area of ​​the light unit strips themselves.

[0011] Further improvement, the pattern density of the diffusion layer between the bright unit strips is greater than the pattern density of the diffusion layer in other areas.

[0012] For further improvement, the light emitting surface depression is arranged on the thick-walled part, and the depth of the light emitting surface depression is inversely proportional to the range covered by the light after being refracted by the diffusion layer.

[0013] Further improvement, the angle of the light entering the bright layer and the angle of the light exiting the bright layer are both zero degrees.

[0014] Further improvement, the distance between the bright units is set to be more than half of the radius of the circumscribed circle of the bright units.

[0015] The beneficial effect of the present invention is that the present invention can enable the automobile taillight to provide a large area of ​​illumination while also realizing the illumination display of a specific shaped pattern, and the shaped pattern can be observed from multiple angles. The intensity of the light directly emitted from the bright layer is greater than the intensity of the light refracted from the refractive layer, thereby making the edge of the shaped pattern softer, the difference between light and dark is small, and the visual effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a rear view of the present invention; Figure 3 for Figure 1 A partial enlarged view of middle A.

[0017] Description of the reference numerals: light source 1 , thick-walled part 2 , reflecting surface 3 , diffusion layer 4 , bright layer 5 , bright unit 6 . DETAILED DESCRIPTION

[0018] The following provides a preferred specific implementation of the present invention in conjunction with the accompanying drawings. What is disclosed is only a preferred specific implementation of the present invention, and it is certainly not intended to limit the scope of rights of the new use model. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

[0019] See attached Figure 1-Figure 3 In this embodiment, the thick-walled light guide device for automobile taillights includes a light source 1, which is composed of a plurality of LED lamp beads. The LED lamp beads are arranged at equal intervals. The LED lamp beads are installed at the bottom of a long strip and arranged in a straight line. A thick-walled member 2 is provided below the light source 1. The two ends of the thick-walled member 2 are respectively provided with a light incident surface and a light emitting surface. A reflecting surface 3 corresponding to the light source 1 is provided on the outer end of the light incident surface of the thick-walled member 2. A diffusion layer 4 capable of refracting light in different directions is provided on the outer end of the light emitting surface of the thick-walled member 2. The diffusion layer 4 plane covers and is spread all over the light emitting surface. The reflecting surface 3 can reflect the light emitted by the light source 1 to the diffusion layer 4 to expand the irradiation. Area; The specific process is that the light source 1 emits light, the light is irradiated on the reflecting surface 3, the reflecting surface 3 reflects the light, the reflected light first enters the thick-walled part 2 through the light incident surface, and then reaches the light exiting surface and is emitted. When the light is emitted at the light exiting surface, the diffusion layer 4 diffuses the light so that the light is refracted in different directions to expand the irradiated area. Since the light source 1 is composed of a plurality of LED lamps, the most original irradiation effect is a small range of high-brightness light spots distributed at intervals. After the LED lamps are processed by the reflecting surface 3 and the diffusion layer 4, the irradiation effect is transformed into a uniform medium-brightness light coverage in a large area; A bright layer 5 is provided on the diffusion layer 4. The bright layer 5 is composed of a plurality of bright units 6. The bright units 6 are distributed at intervals on the diffusion layer 4. When light is emitted through the light-emitting surface of the thick-walled component 2, part of the light will be refracted and diffused through the diffusion layer 4, and the other part of the light will be directly emitted through the bright layer 5. Since the bright layer 5 does not refract or diffuse the light, the intensity of the light emitted from the bright layer 5 is greater than the intensity of the light emitted from the diffusion layer 4. The light emitted from the bright layer 5 will form a bright spot on the illumination coverage surface of the diffusion layer 4. Since the diffusion layer 4 will refract and diffuse the light in multiple directions evenly, the light refracted and diffused from the diffusion layer 4 will cover the light emitted from the bright layer 5, so that the edge of the bright spot formed by the illumination of the bright layer 5 becomes softer, and the transition in visual effect becomes smoother and gentler, reducing the degree of difference between light and dark at the edge of the spot. The light unit 6 is composed of a plurality of slender strips, and the slender strips of each light unit 6 are arranged in a mutually inclined manner or in a horizontal and vertical direction, so that the light spot generated by each light unit 6 is covered as much as possible by the light refracted and diffused by the diffusion layer 4 .

[0020] See attached Figure 1-Figure 3 : The light emitting surface is recessed on the thick-walled part 2. Due to the recess of the light emitting surface, the light refracted and diffused by the diffusion layer 4 will be blocked by the recessed side wall of the light emitting surface recess, thereby affecting the area of ​​the light coverage surface finally formed by the diffusion layer 4. The area of ​​the light coverage surface of the diffusion layer 4 is to a certain extent correlated with the depth of the recess on the light emitting surface, that is, the depth of the recess on the light emitting surface is inversely proportional to the range covered by the light after refraction and diffusion through the diffusion layer 4. When the area of ​​the light coverage surface of the diffusion layer 4 is reduced, the brightness of the light will be enhanced to a certain extent, but it will not exceed the brightness of the light spot formed by the illumination of the bright layer 5. In the actual production process, a variety of thick-walled parts 2 with different light emitting surface recess depths can be produced to meet different scenes and customer customization needs.

[0021] See attached Figure 1-Figure 3 : The diffusion layer 4 is a pattern structure tilted in different directions, which is composed of a number of closely and seamlessly arranged diffusion convex blocks. Each diffusion convex block or each group of diffusion convex blocks tilts in different directions, which can refract light in different directions to increase the uniformity of light irradiation. The top of the light diffusion convex block is provided with a light scattering surface that protrudes outward and is an arc surface, so as to form a refraction effect on the light in different directions. The diffusion layer 4 tilted in different directions and the diffusion convex block with an arc-shaped light scattering surface cooperate with each other to refract and diffuse the light evenly to the greatest extent.

[0022] See attached Figure 1-Figure 3: The bright layer 5 has a smooth surface and is made of a transparent material. The light will not be refracted or diffused after passing through the bright layer. The angles of the light entering the bright layer 5 and the angles of the light exiting the bright layer 5 are both zero degrees. The bright layer 5 is relatively concave on the diffusion layer 4. The purpose of the concave setting is to enable the light emitted from the bright layer 5 to be better gathered to form the required light spot shape.

[0023] See attached Figure 1-Figure 3 : The bright unit 6 is composed of a plurality of straight elongated strip-shaped planes, the inner ends of the elongated strip-shaped planes are connected, and the outer ends are radially extended in different directions. A plurality of bright units 6 are provided and are spaced apart in the middle area of ​​the diffusion layer 4. An angle is provided between the elongated strip-shaped planes of the bright unit 6. The size of the angle is set so that the area between each elongated strip-shaped plane is larger than twice the area of ​​the elongated strip-shaped plane itself. For example, the bright unit 6 is a Y-shaped plane composed of three elongated strip-shaped planes. The area within the Y-shaped angle is larger than twice the area of ​​any one of the three elongated strip-shaped planes. The purpose is to allow a certain number of patterns of the diffusion layer 4 between the Y-shaped angles so that there is enough light to cover the light spot emitted by the elongated strip-shaped planes. The pattern density of the diffusion layer 4 between the slender strip planes of the bright units 6 can also be set to be greater than the pattern density of the diffusion layer 4 in other areas, with the purpose of making the light refracted and diffused by the diffusion layer 4 in this area more uniform and the angle direction of the refracted and diffused light more multi-directional. The distance between the bright units 6 is set to be more than half of the radius of the circumscribed circle of the bright unit 6, with the purpose of maintaining a certain distance between the multiple bright units 6 to avoid mutual interference of the light spots formed by the illumination of the bright units 6, thereby affecting the final illumination effect.

[0024] See attached Figure 1-Figure 3 : The thick-walled part 2 is flat at the top and bottom and wide and long from left to right. The diffusion layer 4 corresponds to the shape of the thick-walled part 2 and forms a long strip that is narrow at the top and bottom and long from left to right. When the existing round car lights are irradiated, a considerable part of the light will be irradiated on the ground, thereby weakening the overall irradiation effect. Therefore, the long strip setting can fully allow the light to irradiate at a long distance and can also provide sufficient space for the refraction and diffusion of the light.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thick-walled light guide device for an automobile taillight, comprising a light source (1), a thick-walled member (2) having a light incident surface and a light emitting surface, a reflective surface (3) disposed on the light incident surface, and a diffusion layer (4) disposed on the light emitting surface and refracting light in different directions, wherein light emitted by the light source (1) is reflected by the reflective surface (3), enters the thick-walled member (2) from the light incident surface, and is emitted from the light emitting surface and refracted in different directions by the diffusion layer (4); the characteristics are as follows: The diffusion layer (4) is provided with a bright layer (5), the bright layer (5) comprising a plurality of bright units (6) spaced apart and distributed on the diffusion layer (4), the bright units (6) being in the shape of a plurality of thin and long strips and being combined with each other in an inclined direction or in a longitudinal and transverse direction; the diffusion layer (4) is in the shape of a flat covering.

2. The thick-walled light guide device for automobile taillights according to claim 1, characterized in that: The thick-walled member (2) is flat at the top and bottom and wide and long at the left and right sides. The diffusion layer (4) covers the light-emitting surface. The diffusion layer (4) corresponds to the shape of the thick-walled member (2) and forms a long strip that is narrow at the top and bottom and long at the left and right sides.

3. The thick-walled light guide device for automobile taillights according to claim 2, characterized in that: The diffusion layer (4) is a pattern structure arranged obliquely in different directions, the pattern structure protrudes outwards on the light emitting surface, and the pattern structure refracts light in different directions.

4. A thick-walled light guide device for a car taillight according to claim 1, 2 or 3, characterized in that: The bright layer (5) has a smooth surface and is made of a transparent material, and is concave relative to the diffusion layer (4).

5. The thick-walled light guide device for automobile taillights according to claim 4, characterized in that: The bright unit (6) comprises a plurality of straight thin strips, the inner ends of the thin strips are connected and extend in different directions; there are a plurality of the bright units (6) which are distributed at intervals in the middle area of ​​the diffusion layer (4), and the pattern structure of the diffusion layer (4) is a flat covering shape.

6. The thick-walled light guide device for automobile taillights according to claim 5, characterized in that: The angles between the thin strips of the bright unit (6) are set so that the area between the thin strips of the bright unit (6) is greater than or equal to twice the area of ​​the thin strips of the bright unit (6) itself.

7. The thick-walled light guide device for automobile taillights according to claim 6, characterized in that: The pattern density of the diffusion layer (4) between the thin strips of the bright units (6) is greater than the pattern density of the diffusion layer (4) in other areas.

8. The thick-walled light guide device for automobile taillights according to claim 1, characterized in that: The light-emitting surface recess is arranged on the thick-walled member (2), and the depth of the light-emitting surface recess is inversely proportional to the range covered by the light after being refracted by the diffusion layer (4).

9. The thick-walled light guide device for automobile taillights according to claim 1, characterized in that: The angle of the light entering the bright layer (5) and the angle of the light exiting the bright layer (5) are both zero degrees.

10. The thick-walled light guide device for automobile taillights according to claim 1, characterized in that: The distance between the bright units (6) is set to be greater than half of the radius of the circumscribed circle of the bright unit (6).

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