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:
Sep. 02, 2014
Filed:
Aug. 26, 2011
Naoko Iwai, Yokosuka, JP;
Toshihiko Sasai, Yokosuka, JP;
Masahiko Kamata, Yokosuka, JP;
Hiroshi Terasaka, Yokosuka, JP;
Toru Ishikita, Yokosuka, JP;
Hitoshi Kawano, Yokosuka, JP;
Masatoshi Kumagai, Yokosuka, JP;
Naoko Iwai, Yokosuka, JP;
Toshihiko Sasai, Yokosuka, JP;
Masahiko Kamata, Yokosuka, JP;
Hiroshi Terasaka, Yokosuka, JP;
Toru Ishikita, Yokosuka, JP;
Hitoshi Kawano, Yokosuka, JP;
Masatoshi Kumagai, Yokosuka, JP;
Toshiba Lighting & Technology Corporation, Kanagawa, JP;
Abstract
A DC power source unitis provided which boosts source voltage from a power source portion. A lighting circuitis provided which supplies DC voltage to loads, the DC voltage being obtained by stepping down output current of the DC power source circuit. A control circuitis provided which controls the lighting circuitin accordance with at least either voltage or current of LEDsand controls the DC power source unitso that a ratio of output voltage to voltage of the LEDsbecomes a preset fixed ratio.