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:
Apr. 22, 2008
Filed:
Sep. 15, 2005
Takuro Sugiura, Fukushima-ken, JP;
Takuro Sugiura, Fukushima-ken, JP;
Alps Electric Co., Ltd, Tokyo, JP;
Abstract
At the light emission surface of a light-guiding plate, first and second grooves and second grooves are formed. Each of the first grooves has a pair of slope parts, and each slope part has an easy slope and a steep slope. The second grooves intersect the first grooves at predetermined angles. Each of the second grooves has a pair of slope parts, and each slope part has an easy slope and a steep slope. With the first grooves and the second grooves intersecting each other, at the light emission surface, a plurality of minute prisms are formed in flat quadrangular pyramid shapes to be dented toward the surface opposite to the light emission surface of the light-guiding plate.