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:
Jul. 08, 2003
Filed:
Oct. 23, 2001
Applicant:
Inventors:
Toru Takahashi, Tokyo, JP;
Yutaka Ishihara, Tokyo, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B 4/136 ;
U.S. Cl.
CPC ...
H05B 4/136 ;
Abstract
The present invention relates to a discharge lamp lighting method and a discharge lamp lighting apparatus that achieve a reduction in the extent of lamp flickering by adopting a relatively simple circuit structure. A power supply unit supplies AC power (Po) to a discharge lamp and a control unit implements control on the power supply unit so as to gradually increase the instantaneous value of the AC power (Po) during a half cycle (&tgr;/2) of an AC pulse current (Io) as the time elapses from the rise of the half cycle (&tgr;/2) toward an end of the half cycle.