The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 2017
Filed:
Feb. 10, 2016
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Eiji Asano, Tokyo, JP;
Daijirou Kodama, Tokyo, JP;
Kazuki Matsumoto, Tokyo, JP;
Keiko Kitano, Tokyo, JP;
Dai Nippon Printing Co., Ltd., Shinjuku-Ku, JP;
Abstract
A light guide plate having light-emitting-side unit optical shapes arranged on a light emitting surface in a direction perpendicular to a light guide direction and a thickness direction of the light guide plate. The optical shape extends in the light guide direction and has a groove shape recessed in the light emitting surface, and a bottom of the groove is formed on a surface which is concave toward the back surface side. Inclined surfaces which are inclined from an edge portion toward the bottom side are formed in two end portions of the concave surface in an arrangement direction. When a width of the optical shape in the arrangement direction is W, a maximum inclination angle θ of the inclined surface relative to the light emitting surface satisfies 20°≦θ≦45°, and a radius of curvature r of the concave surface satisfies r≧W/(4×sin θ).