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:
Dec. 13, 2011
Filed:
Feb. 20, 2009
Tetsuo Terashima, Chino, JP;
Kentaro Yamauchi, Ashiya, JP;
Takeshi Takezawa, Matsumoto, JP;
Kazuo Okawa, Matsumoto, JP;
Tetsuo Terashima, Chino, JP;
Kentaro Yamauchi, Ashiya, JP;
Takeshi Takezawa, Matsumoto, JP;
Kazuo Okawa, Matsumoto, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A method for driving a discharge lamp that lights by performing discharge between two electrodes while alternately switching a polarity of a voltage applied between the two electrodes includes: modulating an anode duty ratio, which is a ratio of an anode time for which one of the electrodes operates as an anode in one period of the polarity switching, by setting first and second periods with different anode duty ratios; and setting the first period, in which the anode duty ratio is higher than that in the second period, longer than the second period in one modulation period, which includes the first and second periods and for which the modulation is performed, when a predetermined condition is satisfied.