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:
Jun. 19, 2012
Filed:
Dec. 05, 2008
Kentaro Yamauchi, Ashiya, JP;
Tetsuo Terashima, Chino, JP;
Takeshi Takezawa, Matsumoto, JP;
Kazuo Okawa, Matsumoto, JP;
Shigeyasu Soma, Shiojiri, JP;
Kentaro Yamauchi, Ashiya, JP;
Tetsuo Terashima, Chino, JP;
Takeshi Takezawa, Matsumoto, JP;
Kazuo Okawa, Matsumoto, JP;
Shigeyasu Soma, Shiojiri, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
To prevent biased consumption of electrodes in a discharge lamp and to prevent biased precipitation of the electrode material, a light source is provided. The light source device has a discharge lamp that emits light by discharge between a first electrode and a second electrode; and a driver that supplies alternating current to the first and the second electrodes so as to maintain the discharge, and changes duty ratio of the alternating current in accordance with predetermined pattern. The predetermined pattern includes a plurality of section periods for which the duty ratio maintains mutually different values for a predetermined period.