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:
Jul. 31, 2018
Filed:
Jul. 14, 2016
Applicant:
Stanley Electric Co., Ltd., Meguro-ku, Tokyo, JP;
Inventors:
Yoji Oki, Tokyo, JP;
Kazumi Chijiwa, Tokyo, JP;
Assignee:
STANLEY ELECTRIC CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F21V 8/00 (2006.01);
U.S. Cl.
CPC ...
G02B 6/0053 (2013.01); G02B 6/0038 (2013.01); G02B 6/0068 (2013.01);
Abstract
A surface light source devicecomprises light sourcesanda light guide plateand a prism sheetA plurality of ridgesare formed on the incident surface of the prism sheetEach ridgeincludes first and second inclined surfacesandwhose inclination angles with respect to a normal lineare Aand Arespectively, provided that 35.5°≤A1≤39° and 23°≤A2≤30°.