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:
Apr. 15, 1997
Filed:
Jun. 05, 1995
Applicant:
Inventors:
Kenji Kawabata, Tokyo, JP;
Ryuichi Ikeda, Kanagawa-ken, JP;
Motohiro Sugino, Kanagawa-ken, JP;
Takashi Okada, Tokyo, JP;
Johji Mamiya, Kanagawa-ken, JP;
Assignees:
International Business Machines Corporation, Armonk, NY (US);
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F / ;
U.S. Cl.
CPC ...
315311 ; 315307 ; 3152 / ; 315224 ; 315226 ;
Abstract
A current feedback type discharge lamp lighting device including a switching circuit which switches an impedance of an impedance device in accordance with the number of connected discharge tubes. In the discharge lamp lighting device, a tube current for each of the connected discharge tubes is maintained constant, and the discharge lamp lighting device tends to not be effected by stray capacitance.