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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.:

US 4954930 B1

PDFFull Text
Date of Patent:
Sep. 04, 1990

Filed:

Sep. 25, 1989

Illumination light guide

Applicant:
Inventors:

Mamoru Maegawa, Furukawa, JP;

Fumio Sakamoto, Furukawa, JP;

Assignee:

Alps Electric Co., Ltd., Tokyo, JP;

Attorneys:

Shoup; Guy W.

Winters; Paul J.

Primary Examiner:

Ira S Lazarus

Assistant Examiner:

Richard R Cole

Int. Cl.
CPC ...
F21V / ;
U.S. Cl.
CPC ...
362 26 ; 362 31 ; 362 32 ; 362 85 ;
Abstract

An illumination light guide includes a plurality of elongated illuminating portions; a light guiding path portion connecting one end of each of the illuminating portions; a light receiving portion formed in the light guiding path portion; a plurality of light distributing/reflecting portions formed in the light guiding path portion so as to correspond to the illuminating portions and having different lengths such that the longer a distance from the light receiving portion to one of the light distributing/reflecting portions, the longer a length of the one of the light distributing/reflecting portions; and a plurality of light reflecting portions formed at the other ends of the illuminating portions, respectively. With this structure, the light emitted from a single light source is received by the light receiving portion, and is uniformly distributed and reflected by the light distributing/reflecting portions and transmitted into the respective illuminating portions. Light transmitted through the illuminating portions is also reflected by the respective light reflecting portions, and is returned into the adjacent illuminating portions to ensure uniform illumination.

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Maegawa, Mamoru. (1990). Illumination light guide (U.S. Patent No. 4954930). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4954930

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