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:
Dec. 26, 2006
Filed:
Jan. 30, 2003
Tomoyoshi Yamashita, Kanagawa, JP;
Issei Chiba, Kanagawa, JP;
Tomoyoshi Yamashita, Kanagawa, JP;
Issei Chiba, Kanagawa, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Abstract
A surface light source apparatus includes a primary light source (), an optical guide () for guiding light emitted from the primary light source and having a light incoming surface () and a light outgoing surface (), a light deflection element () arranged adjacent to the light outgoing surface of the optical guide and having a light incoming surface () and a light outgoing surface (), and a light diffusion element () arranged adjacent to the light outgoing surface of the light deflection element. The light incoming surface () of the light deflection element has a plurality of prism strings arranged substantially parallel to each other and each having two prism surfaces. At least one of the prism surfaces of these prism strings has a prism surface consisting of at least two planes having different inclination angles. As the plane approaches the light going surface, the inclination becomes larger.