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:
Aug. 20, 2013
Filed:
Sep. 10, 2009
Hirokazu Ohtake, Yokosuka, JP;
Hiroshi Terasaka, Yokohama, JP;
Mitsuhiko Nishiie, Sunto-Gun, JP;
Takuro Hiramatsu, Yokohama, JP;
Hirokazu Ohtake, Yokosuka, JP;
Hiroshi Terasaka, Yokohama, JP;
Mitsuhiko Nishiie, Sunto-Gun, JP;
Takuro Hiramatsu, Yokohama, JP;
Toshiba Lighting & Technology Corporation, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
In a power supply unit, if a dimmer rate is changed within a range of k, k, . . . kby a dimmer signal k of a dimmer signal generator, light-emitting diodes are controlled to be lighted by a constant current characteristic in an area where the dimmer rate is small according to a load characteristic corresponding to the dimmer rates k, k, . . . k. As the dimmer rate becomes larger, a tendency of a constant voltage characteristic is gradually strengthened from a constant current characteristic so that the light-emitting diodes are lighted at the larger dimmer rate.