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:
Jul. 11, 2017
Filed:
Sep. 14, 2016
Applicant:
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Inventor:
Takaaki Gyoten, Hyogo, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 37/00 (2006.01); G03B 21/20 (2006.01); H04N 9/31 (2006.01); H05B 37/02 (2006.01);
U.S. Cl.
CPC ...
G03B 21/2053 (2013.01); G03B 21/204 (2013.01); H04N 9/3164 (2013.01); H05B 37/0209 (2013.01);
Abstract
Prior to a rising timing of a switching signal, a second FET is turned ON for a predetermined period according to a voltage switching signal. This allows a sum of a supply voltage of a first switching power source and a supply voltage of a second switching power source to be applied to a series circuit of a semiconductor light source, a drain-source of a first FET, and a current detecting resistor for a predetermined period before and after the rising timing of the switching signal.