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:
Mar. 17, 1998
Filed:
Sep. 27, 1995
Teiji Shimokawa, Yokohama, JP;
Akio Ishizuka, Yokosuka, JP;
Toshiba Lighting & Technology Corporation, Tokyo, JP;
Abstract
A high frequency (HF) lighting apparatus includes a rare gas discharge lamp and a power supply. The lamp has an envelope having a rare gas therein. A pair of electrodes is provided in the envelope, and an external conductor is provided near the envelope. The power supply includes a HF electric power circuit to generate a HF electric power. The HF electric power circuit has an output whose crest factor is 2.3 or more. The power supply has a ballast coupled between the HF electric power circuit and the lamp for applying stabilized HF current to the lamp. The power supply further has a DC supply circuit including a rectifier for rectifying the HF to DC and a voltage divider. The voltage divider is disposed between the lamp and the rectifier for applying a potential to the external conductor of the lamp and for adding a DC current to the stabilized HF current.