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. 01, 2006
Filed:
Sep. 30, 2004
Yutaka Ishihara, Tokyo, JP;
Kazuo Okawa, Suwa, JP;
Yutaka Ishihara, Tokyo, JP;
Kazuo Okawa, Suwa, JP;
TDK Corporation, Tokyo, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
The present invention relates to a discharge lamp lighting apparatus which can prevent an increase of loss and a rise of temperature in the area where discharge lamp tube voltage is low. The power conversion circuitconverts the input power Pin to output the DC power Pd. The discharge lamp driving circuitconverts the DC power Pd supplied from the power conversion circuitto output AC voltage Vo and AC current Io. The controllerprovides constant power control for maintaining the AC power Po provided by the AC voltage Vo and AC current Io to be constant when the AC voltage Vo is higher than the predetermined value V, and provides power reduction control for reducing AC power Po to the power conversion circuitwhen the AC voltage Vo is lower than the predetermined value V