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, 2002
Filed:
Dec. 16, 1997
Applicant:
Inventors:
Masami Tabata, Isehara, JP;
Tatsundo Kawai, Hadano, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F21V 8/00 ;
U.S. Cl.
CPC ...
F21V 8/00 ;
Abstract
A light source or LED element is positioned adjacent to an entrance surface of a light guide element of stick shape made of a light transmissive substrate. The light that has entered from the entrance surface to the interior of the light guide element is scattered by a diffusion area to emerge from an exit surface in a predetermined direction, wherein the light that has entered from the entrance surface into the light guide element is not made incident directly on at least a part of the diffusion area.