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:
Nov. 12, 2013
Filed:
Oct. 05, 2009
Applicants:
Kentaro Yamauchi, Ashiya, JP;
Tetsuo Terashima, Chino, JP;
Inventors:
Kentaro Yamauchi, Ashiya, JP;
Tetsuo Terashima, Chino, JP;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B 37/00 (2006.01); H05B 39/04 (2006.01); H05B 41/36 (2006.01); H05B 37/02 (2006.01); H05B 39/02 (2006.01); H05B 39/00 (2006.01); H05B 41/16 (2006.01); H05B 41/24 (2006.01); H05B 41/00 (2006.01); H01J 13/48 (2006.01); H01J 15/04 (2006.01); H01J 17/36 (2006.01);
U.S. Cl.
CPC ...
Abstract
In at least one embodiment of the disclosure, a discharge lamp driving device includes a discharge lamp lighting unit configured to supply power to a discharge lamp while alternately switching a polarity of a voltage applied across two electrodes of the discharge lamp. A controller performs a modulation control of the power in accordance with a power ratio characterized by the power supplied in a polarity switching period. The controller starts the modulation control at a predetermined time after the power supplied to the discharge lamp reaches a predetermined power value.