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:
Oct. 05, 1999
Filed:
Dec. 09, 1996
Kayoko Watai, Hasuda, JP;
Hiromi Sasako, Tokyo, JP;
Enplas Corporation, Kawaguchi, US;
Yasuhiro Koike, Yokohama, US;
Abstract
A wedge-shaped light scattering guide plate 10 employed in a surface light source device of side-light type has a width equal to the length of a primary light source element. An incidence end surface 11 is formed as a matte surface (rough surface) by a matting process. The incidence end surface 11 is provided with roughness which is uniform or increases toward end portions. The roughened incidence end surface 11 produces scattered light in the vicinity of the incidence end surface, especially at both side end portions. The scattered light contributes to elimination of variation in luminance which tends to occur in the vicinity of the incidence end surface 11. A light diffusing plate may be interposed between the primary light source element and the light scattering guide plate.