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. 23, 2013
Filed:
Jan. 11, 2011
Takako Ishikawa, Kusatsu, JP;
Yasuhiro Tanoue, Otsu, JP;
Masayuki Shinohara, Nagaokakyo, JP;
Yoshihiro Ueno, Kusatsu, JP;
Takako Ishikawa, Kusatsu, JP;
Yasuhiro Tanoue, Otsu, JP;
Masayuki Shinohara, Nagaokakyo, JP;
Yoshihiro Ueno, Kusatsu, JP;
OMRON Corporation, Kyoto, JP;
Abstract
An area light source device that is capable of evenly emitting light by reducing leakage in the vicinity of the light source, and enhancing the light emission luminance by exiting light of narrower directional characteristics. A light guide substrate includes a light introducing section and a light guide plate main body. Diffusion patterns are provided at the light exit surface of the light guide plate main body. A low refraction index layer is formed at the lower surface of the light guide plate main body, and a reflection layer is formed at the lower surface of the low refraction index layer. The point light source is positioned facing an end face of the light introducing section. A directivity conversion unit is arranged on the upper surface of the light introducing section. The directivity conversion unit is configured by radially arraying a directivity conversion pattern having a V groove shape.