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. 31, 2016
Filed:
May. 29, 2013
Panasonic Corporation, Osaka, JP;
Toshiaki Nakamura, Osaka, JP;
Abstract
A switching circuit includes an active element connected in parallel to a second light source block and having an impedance that varies in accordance with a control signal input into a control terminal, and switches the second light source block between a lit condition and an extinguished condition by switching the active element ON and OFF. The switching circuit adjusts the impedance of the active element so that a current flowing to the active element matches a target value set by a switching control circuit. When the active element is to be switched ON, the switching control circuit varies the target value gradually over time, and therefore an excessive load current can be prevented from flowing while the active element shifts from an OFF condition to an ON condition.