CN-121977181-A - Ultra-thin annular light guide device

Abstract

The invention discloses an ultrathin annular light guide device which comprises a PCBA plate, an annular light guide, a diffusion lens and a shading structure. The annular light guide comprises a coupling section, a first light splitting section, a second light splitting section and a closed loop section, wherein the first light splitting section and the second light splitting section are connected end to end through the closed loop section, the annular light guide and the PCBA plate are positioned between the shading structure and the diffusion lens, and the PCBA plate comprises 1 white light source or 1 RGB light source. The ultrathin annular light guide device has the beneficial effect that a uniform and complete annular light emitting effect can be realized only by one light source and one light guide. The required space depth is small, and the limit space depth is not more than 4.5mm.

Inventors

• JIN WEIPING
• CHEN TAO
• WANG DANDAN
• WANG ZIXIN
• ZHAO HUANYU

Assignees

• 敏实海拉(嘉兴)汽车零部件有限公司

Dates

Publication Date

20260505

Application Date

20231216

Claims (9)

1. 1. An ultra-thin annular light guide comprising a PCBA plate, an annular light guide, a diffusion lens, and a light shielding structure, wherein: The annular light guide comprises a coupling section, a first light splitting section, a second light splitting section and a closed loop section, wherein the first light splitting section and the second light splitting section are connected end to end through the closed loop section; the annular light guide and the PCBA plate are positioned between the shading structure and the diffusion lens; the PCBA board includes 1 white light source or 1 RGB light source.
2. 2. The ultra-thin annular light guide apparatus of claim 1, wherein the back of the annular light guide has a saw tooth structure for adjusting the optical path of the annular light guide.
3. 3. The ultra-thin annular light guide of claim 1, wherein the saw tooth structure is micro grooves or micro protrusions of unequal spacing and size.
4. 4. The ultra-thin annular light guide of claim 3, wherein the diffusion lens is made of a milky-white scattering material.
5. 5. The ultra-thin annular light guide of claim 1, wherein the first beam-splitting section has a curvature that is 2 to 6 times the radius of the smallest circumscribed circle of the cross-section of the first beam-splitting section, and wherein the second beam-splitting section has a curvature that is 2 to 6 times the radius of the smallest circumscribed circle of the cross-section of the second beam-splitting section.
6. 6. The ultra-thin annular light guide of claim 1, wherein the smallest circumscribed circle diameter of the cross section of the annular light guide is 0.5mm to 3.5mm.
7. 7. The ultra-thin annular light guide of claim 1, wherein the coupling section and the first and second light splitting sections are both in the same plane.
8. 8. The ultra-thin annular light guide of claim 1, wherein the annular light guide is circular or ice cream shaped in cross-section.
9. 9. The ultra-thin annular light guide of claim 1, wherein the annular light guide is injection molded from PMMA material or PC transparent material.

Description

Ultra-thin annular light guide device Technical Field The invention belongs to the field of automobile interior and exterior trim parts, and particularly relates to an ultrathin annular light guide device. Background At present, in the field of automobile lamps, only a small amount of products can realize annular luminescence. There are two main solutions for these products. One is a direct type light emitting scheme of a plurality of light sources and a milky white lens, and the other is a scheme of two light sources and a light guide. The direct type light emitting scheme with a plurality of light sources and milky lenses has the defects that the number of LEDs is large, and the required space depth is deep, and is often 15 mm-40 mm. The two light sources and light guides have the disadvantage that a complete ring shape cannot be achieved, often with a section that needs to be shielded. By way of further illustration, the multiple light source direct-lit approach requires a relatively deep space and is relatively costly. The main structure of the multi-light source is a plurality of LEDs below and a light guide and a diffusion lens above. The depth distance of 15 mm-40 mm is needed for a common multi-light source lamp. At the same time, one LED needs to be placed along the length direction of about 10mm, and when the annular length reaches 100mm, at least 10 LEDs are needed. Referring to side-entry dual light source 1P of fig. 1, the dual light source side-entry light guide arrangement, while having reduced cost, typically has an extra dark region in the middle that does not form a complete ring. Disclosure of Invention The present invention is directed to the state of the art and provides an ultra-thin annular light guide that overcomes the above-identified deficiencies. The invention adopts the following technical scheme that the ultrathin annular light guide device comprises a PCBA plate, an annular light guide, a diffusion lens and a shading structure, wherein: The annular light guide comprises a coupling section, a first light splitting section, a second light splitting section and a closed loop section, wherein the first light splitting section and the second light splitting section are connected end to end through the closed loop section; the annular light guide and the PCBA plate are positioned between the shading structure and the diffusion lens; the PCBA board includes 1 white light source or 1 RGB light source. As a further preferable aspect of the above technical aspect, the back of the annular light guide has a saw-tooth structure for adjusting the optical path of the annular light guide. As a further preferable embodiment of the above embodiment, the serration structure is a minute groove or a minute protrusion having unequal intervals and sizes. As a further preferable embodiment of the above embodiment, the diffusion lens is made of a milky white scattering material. As a further preferable mode of the above technical means, the curvature of the first spectroscopic section is 2 to 6 times the minimum circumscribed circle radius of the cross section of the first spectroscopic section, and the curvature of the second spectroscopic section is 2 to 6 times the minimum circumscribed circle radius of the cross section of the second spectroscopic section. As a further preferable aspect of the above aspect, the smallest circumscribed circle diameter of the cross section of the annular light guide is 0.5mm to 3.5mm. As a further preferable technical scheme of the technical scheme, the coupling section, the first light splitting section and the second light splitting section are located on the same plane. As a further preferable aspect of the above technical aspect, the annular light guide has a circular cross section or an ice cream shape. As a further preferable technical scheme of the technical scheme, the annular light guide is formed by injection molding of PMMA material or PC transparent material. The ultrathin annular light guide device disclosed by the invention has the beneficial effects that: 1. Only one light source and one light guide are needed to realize the uniform and complete annular luminous effect. 2. The required space depth is small, and the limit space depth is not more than 4.5mm. Drawings Fig. 1 is a schematic diagram of a prior art dual light source side entry solution. Fig. 2 is a schematic diagram of the explosive structure of the present application. Fig. 3 is a schematic structural view of the annular light guide of the present application. Fig. 4 is a schematic cross-sectional structure of the annular light guide of the present application. Fig. 5 is a schematic cross-sectional structure of the annular light guide of the present application. Fig. 6A is a schematic view of the back structure of the annular light guide of the present application. Fig. 6B is a schematic view of the back structure of the annular light guide of the present application. Fig. 6C is a schematic