Illumination light guide

Patent metadata

Field	Value
Publication number	US-2016103269-A1
Application number	US-201514865452-A
Country	US
Kind code	A1
Filing date	Sep 25, 2015
Priority date	Oct 10, 2014
Publication date	Apr 14, 2016
Grant date	—

Abstract

A light guide of a vehicular lamp includes a first light guide body that guides the incident light from a stationary side light source, and a second light guide body that guides the incident light from a movable side light source. The first light guide body is formed in a twisted bow shape. A reflection portion is formed on the rear surface of each of the first and second light guide bodies to reflect the incident light toward the front surface, and an emission portion is formed on the front surface to emit the reflected light. First and second side surfaces of each light guide body include a curved surface that is indicated as a curved line on a cross section of the light guide body. A side step is formed on the first side surface of the first light guide body to reflect the incident light toward the second side surface.

First claim

What is claimed is:

1 . An illumination light guide comprising:
a band-shaped light guide body configured to guide incident light in a longitudinal direction, the light guide body including a front surface and a rear surface which are opposite to each other in a thickness direction, and two side surfaces which are opposite to each other in a width direction, wherein a reflection portion configured to reflect the incident light to the front surface side is formed on the rear surface, an emission portion configured to emit reflected light is formed on the front surface, and each of the two side surfaces includes a curved surface that is indicated as a curved line on a cross section of which a normal corresponds to the longitudinal direction of the light guide body.

2 . The illumination light guide of claim 1 , wherein the light guide body is formed in a twisted band shape, and an incident portion is formed in one end of the light guide body.

3 . The illumination light guide of claim 2 , wherein the light guide body is formed in a bow shape which is widened as going away from the incident portion.

4 . The illumination light guide of claim 3 , wherein the two side surfaces include a first side surface that extends outside the bow shape and a second side surface that extends inside the bow shape, and a side step configured to reflect the incident light toward the second side surface is formed on the first side surface.

5 . The illumination light guide of claim 2 , wherein an incident step configured to diffuse the incident light in a thickness direction of the light guide body is formed on an end surface of the incident portion.

6 . The illumination light guide of claim 3 , wherein an incident step configured to diffuse the incident light in a thickness direction of the light guide body is formed on an end surface of the incident portion.

7 . The illumination light guide of claim 4 , wherein an incident step configured to diffuse the incident light in a thickness direction of the light guide body is formed on an end surface of the incident portion.

Assignees

• Koito Mfg Co Ltd

Inventors

• Narita Yuho

Classifications

• B60Q1/26

  the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic · CPC title

• G02B6/0045 Primary

  by shaping at least a portion of the light guide · CPC title

• F21S43/239

  plate-shaped · CPC title

• G02B6/002

  by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces · CPC title

• F21S43/14

  Light emitting diodes [LED] · CPC title