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. 07, 1999
Filed:
Aug. 15, 1997
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An operating apparatus for a discharge lamp, which includes a pair of electrodes and an arc tube having a material enclosed therein, includes: a selective depositing device for selectively depositing the material on one electrode of the pair of electrodes when the discharge lamp is turned off; and a ballast circuit for starting operation of the discharge lamp and maintaining the operation under rated conditions. The ballast circuit includes a starting pulse generator for applying a starting pulse to the discharge lamp when the discharge lamp starts the operation. The starting pulse generates an electric field acting from the one electrode of the pair of electrodes having the material deposited thereon to the other electrode.