# US 2019/0168667 A1 · Light guide member, vehicle illumination device, and method for manufacturing light guide member

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- Number: US 2019/0168667 A1
- Document ID: US20190168667A1
- Status: Published application
- Kind: A1
- Application number: 16/205,782
- Filed: 2018-11-30
- Published: 2019-06-06
- Earliest claimed: 2017-12-04
- Assignees: Yazaki Corporation
- Applicants: Yazaki Corporation
- Inventors: Kazuya SATO
- Web page: https://patentgrep.com/patent/US20190168667A1

## CPC

- B60Q 3/64: for a single lighting device
- B60Q 3/217: Doors, e.g. door sills; Steps
- B60Q 3/54: Lighting devices embedded in interior trim, e.g. in roof liners
- G02B 6/0036: {2-D arrangement of prisms, protrusions, indentations or roughened surfaces}
- G02B 6/0038: {Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide}
- G02B 6/0065: {Manufacturing aspects; Material aspects}
- G02B 6/0055: {Reflecting element, sheet or layer}
- B60Q: ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A light guide member includes: a light guide member body made of a light transmissive material; a white back surface white-coated layer provided on a back surface of the light guide member body; a white front surface white-coated layer provided on a front surface of the light guide member body; and a black front surface black-coated layer provided on a front surface of the front surface white-coated layer. A light irradiation hole which is opened in the front surface black-coated layer and the front surface white-coated layer and through which the light guide member body is exposed is provided.

## Claims

### Claim 1

A light guide member comprising:
a light guide member body made of a light transmissive material;
a white back surface white-coated layer provided on a back surface of the light guide member body;
a white front surface white-coated layer provided on a front surface of the light guide member body;
a black front surface black-coated layer provided on a front surface of the front surface white-coated layer; and
a light irradiation hole which is opened in the front surface black-coated layer and the front surface white-coated layer and through which the light guide member body is exposed.

### Claim 2 (depends on 1)

The light guide member according to claim 1, further comprising
a black back surface black-coated layer provided on a back surface of the back surface white-coated layer.

### Claim 3 (depends on 1)

The light guide member according to claim 1, further comprising
a light scattering layer having an uneven shape on the front surface of the light guide member body exposed through the light irradiation hole.

### Claim 4

A vehicle illumination device comprising:
a light source; and
a light guide member to which light from the light source is incident from an end face,
wherein the light guide member comprises:
a light guide member body made of a light transmissive material;
a white back surface white-coated layer provided on a back surface of the light guide member body;
a white front surface white-coated layer provided on a front surface of the light guide member body;
a black front surface black-coated layer provided on a front surface of the front surface white-coated layer; and
a light irradiation hole which is opened in the front surface black-coated layer and the front surface white-coated layer and through which the light guide member body is exposed.

### Claim 5 (depends on 4)

The vehicle illumination device according to claim 4, wherein
the light guide member further comprises a black back surface black-coated layer provided on a back surface of the back surface white-coated layer.

### Claim 6

A method for manufacturing a light guide member comprising:
a coating step of coating a back surface and a front surface of a light guide member body made of a light transmissive material with white and black to form a back surface white-coated layer, a front surface white-coated layer, and a front surface black-coated layer; and
a laser step of emitting a laser beam to form a light irradiation hole which is open in the front surface black-coated layer and the front surface white-coated layer and through which the light guide member body is exposed, after the coating step.