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. 21, 2015
Filed:
Dec. 02, 2013
Panasonic Corporation, Osaka, JP;
Masafumi Yamamoto, Hyogo, JP;
Satoru Nagata, Hyogo, JP;
Masato Himeda, Hyogo, JP;
Hisaya Takikita, Osaka, JP;
Koki Matsui, Osaka, JP;
Abstract
A lighting device () includes a voltage converter () for generating a predetermined DC voltage, a detector () for obtaining a detection voltage corresponding to a predetermined DC voltage applied across a light source (), a controller () for controlling the voltage converter () so that a current flowing through the light source () is constant, and a determination unit () for determining whether the detection voltage is a preset first reference voltage or higher. The first reference voltage is set higher by a specified voltage than the detection voltage, and is set to vary more slowly than the detection voltage. The controller () stops an operation of the voltage converter () when the detection voltage is determined to be the first reference voltage or higher through the determination unit ().