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:
May. 13, 2008
Filed:
May. 22, 2006
Kazuhide Hirota, Yasu, JP;
Isao Makuta, Kusatsu, JP;
Masayuki Shinohara, Nagaokakyo, JP;
Omron Corporation, Kyoto, JP;
Abstract
A light emission part in the form of a point light source composed of LED, etc., and a light conductive plate, and the light emission part is arranged in opposition to a light incident surface of the light conductive plate. First diffusion patterns and second diffusion patterns are provided alternately on the light incident surface. The first diffusion patterns comprise a V-groove provided on an inner surface of a rectangular-shaped recess provided concavely on the light incident surface. The second diffusion patterns comprise a V-groove provided on the light incident surface. When a virtual line segment in parallel to a line segment drawn from the light emission part to a corner of the surface light emission region of the light conductive plate is drawn from an end of the recess, the V-groove and the second diffusion patterns are provided not to get over the virtual line segment.