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. 10, 2004
Filed:
Sep. 20, 2002
Applicant:
Inventors:
Shinichi Suzuki, Shizuoka-ken, JP;
Yasuhiro Kamiya, Shizuoka-ken, JP;
Koji Kawamoto, Tokyo, JP;
Masakazu Ushijima, Tokyo, JP;
Assignee:
Minebea Co., Ltd., Nagano-ken, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B 3/702 ;
U.S. Cl.
CPC ...
H05B 3/702 ;
Abstract
An inverter circuit for a discharge tube of the present invention comprises a transformer in which a resonance circuit is composed of a parasitic capacitance of a discharge tube, and a H-bridge circuit which drives the primary side of the transformer at a frequency that is lower than the resonance frequency of the resonance circuit and that involves a phase difference between the voltage and the current at the primary side of the transformer, the phase difference falling within a predetermined range from its minimum point.