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:
Nov. 14, 2006
Filed:
Aug. 26, 2004
Applicant:
Tetsuo Tanabe, Aichi-ken, JP;
Inventor:
Tetsuo Tanabe, Aichi-ken, JP;
Assignee:
Toyoda Gosei Co., Ltd., Aichi-ken, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F 1/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An LED power supply device has a loop circuit formed by a switching circuit, an LED and a comparison circuit, and a reference voltage generation circuit for providing reference voltage to the comparison circuit. The loop circuit oscillates so that substantially constant current is applied to the LED.