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. 27, 2005
Filed:
Nov. 19, 2003
Kazuo Okawa, Matsumoto, JP;
Tomiyoshi Ushiyama, Minowa-machi, JP;
Kazuo Okawa, Matsumoto, JP;
Tomiyoshi Ushiyama, Minowa-machi, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
The invention provides a circuit to drive a light source capable of lengthening the life span of the light source and of coping with both a rated power mode and a power saving mode. A circuit to drive a light source includes a control device to drive the light source, which is composed of a discharge tube, and to switch the light source to a plurality of lighting modes including a rated power mode and a power saving mode. The control device includes a lighting mode setting unit to set the lighting mode to one of the plurality of lighting modes, and a rated power supplying unit to supply a rated power to the light source at the lighting starting time of the light source until a halogen cycle of the discharge tube is stabilized. The control device switches the light source to the lighting mode set by the lighting mode setting unit after the halogen cycle of the discharge tube is stabilized.