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:
Mar. 19, 2013
Filed:
Jul. 08, 2009
Masayuki Shinohara, Nagaokakyo, JP;
Yasuhiro Tanoue, Otsu, JP;
Takako Ishikawa, Kusatsu, JP;
Yoshihiro Ueno, Kusatsu, JP;
Masayuki Shinohara, Nagaokakyo, JP;
Yasuhiro Tanoue, Otsu, JP;
Takako Ishikawa, Kusatsu, JP;
Yoshihiro Ueno, Kusatsu, JP;
OMRON Corporation, Kyoto, JP;
Abstract
A surface light source device includes a point source of light and a light guide plate causing light from the point source of light introduced from a light incident end face and emitted from a light emission surface to outside. The light guide plate is formed of a light introducing portion provided at an end of a light guide plate body. The point source of light is placed facing the light incident end face positioned at an end face of the light introducing portion. Along a region of the light introducing portion adjacent to the light guide plate body, a directivity converting portion is provided. The directivity converting portion is configured by arranging V-grooved directivity conversion patterns in an arc shape. A region of the light introducing portion has a thickness equal to that of the light guide plate body and has a surface positioned in the same plane.