Light guide plate

Patent metadata

Field	Value
Publication number	US-2016377792-A1
Application number	US-201615156387-A
Country	US
Kind code	A1
Filing date	May 17, 2016
Priority date	Jun 26, 2015
Publication date	Dec 29, 2016
Grant date	—

Abstract

A light guide plate includes a diffusing surface that diffuses incident light having a concave cylindrical surface shape with curvature in a first direction, and an exit surface having a convex cylindrical surface shape with curvature in the first direction. The light guide plate is constituted such that a pattern provided behind the diffusing surface is visible from the exit surface side. The light guide plate has an incident surface on at least one end of the light guide plate in the first direction, and prisms that are formed in the diffusing surface and reflect visible light from a light source that enters the light guide plate from the incident surface toward the exit surface. Each prism has a reflecting surface oriented toward the incident surface side, and an angle between the reflecting surface and the diffusing surface increases, the further the prism is from the incident surface.

First claim

1 . A light guide plate in which a diffusing surface that diffuses incident light is formed to have a concave cylindrical surface shape with curvature in a first direction, an exit surface opposing the diffusing surface is formed to have a convex cylindrical surface shape with curvature in the first direction, and the light guide plate is constituted such that a pattern provided behind the diffusing surface is visible from the exit surface side,
wherein the light guide plate includes: an incident surface formed on at least one end of the light guide plate in the first direction; and a plurality of prisms that are formed in the diffusing surface and reflect visible light that enters the light guide plate from the incident surface toward the exit surface, and each of the plurality of prisms has a reflecting surface oriented toward the incident surface side, and an angle between the reflecting surface and the diffusing surface increases, the further the prism is from the incident surface.

2 . The light guide plate according to claim 1 , wherein the plurality of prisms are arranged along a predetermined pattern.

3 . The light guide plate according to claim 1 , wherein each of the plurality of prisms is formed such that an area of the reflecting surface increases, the closer the prism is to the incident surface among the plurality of prisms.

Assignees

• Omron Tateisi Electronics Co

Inventors

• Muraoka Eiji
• Kakinuma Takeshi
• Takagi Yoshihiko

Classifications

• G02B6/0036 Primary

  2-D arrangement of prisms, protrusions, indentations or roughened surfaces · CPC title

• G07F17/3248

  involving non-monetary media of fixed value, e.g. casino chips of fixed value · CPC title

• G07F17/34

  depending on the stopping of moving members {in a mechanical slot machine}, e.g. "fruit" machines · CPC title

• G07F17/3213

  Details of moving display elements, e.g. spinning reels, tumbling members · CPC title

• G02B6/0061

  to provide homogeneous light output intensity · CPC title