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:
Nov. 30, 1999
Filed:
Sep. 27, 1996
Shozo Kataoka, Hirakata, JP;
Fumio Ueno, Kikuchi-gun, JP;
Ikko Harada, Kumamoto, JP;
Noriaki Hara, Kumamoto, JP;
Ichirou Oota, Kikuchi-gun, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
A light source power supply circuit includes a DC power source and an energy accumulating capacitor connected in parallel through a charging switching element to the DC power source. A polarity inverting circuit is connected across the energy accumulating capacitor for applying the capacitor voltage across a light source with the polarity alternately inverted. A starting high voltage generating circuit applies a high voltage to the light source a high voltage for starting the light source. A control circuit controls a polarity inverting circuit so that the inverting frequency is above a critical fusion frequency for the light source.