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. 16, 2011
Filed:
Oct. 27, 2008
Tetsuo Terashima, Chino, JP;
Kentaro Yamauchi, Ashiya, JP;
Takeshi Takezawa, Matsumoto, JP;
Kazuo Okawa, Matsumoto, JP;
Keishi Kimura, Matsumoto, JP;
Tetsuo Terashima, Chino, JP;
Kentaro Yamauchi, Ashiya, JP;
Takeshi Takezawa, Matsumoto, JP;
Kazuo Okawa, Matsumoto, JP;
Keishi Kimura, Matsumoto, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A light source includes an arc tube having a first electrode and a second electrode that emit light by discharge between the electrodes, and a driving unit that supplies a current between the first electrode and the second electrode and can change at least a waveform of frequency and waveform of the supplied current. The driving unit can perform lighting drive of the arc tube, using a driving waveform formed by combining a first lighting waveform having a maximum current value at a part other than a half-cycle rear end of the waveform and a second lighting waveform having a maximum current value at the half-cycle rear end of the waveform.