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:
Sep. 14, 2004
Filed:
May. 29, 2003
Applicant:
Inventor:
Kazutoshi Mita, Kanagawa-ken, JP;
Assignee:
Toshiba Lighting & Technology Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 3/702 ;
U.S. Cl.
CPC ...
H05B 3/702 ;
Abstract
A high-pressure discharge lamp lighting apparatus, comprises an LC resonance circuit, a DC power source, an inverter circuit, an inverter circuit and an inverter control circuit. The resonance frequency of the LC resonance circuit is set in two to three times the oscillation frequency in the steady lighting operation of the high-pressure discharge lamp. Until the high-pressure discharge lamp is started and steadily lit up, the starting control circuit controls to operate the inverter circuit at a frequency lower than the resonance frequency and not causing acoustic resonance.