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:
Feb. 04, 2003
Filed:
Mar. 30, 2001
Masami Kobayashi, Kanagawa-ken, JP;
Yoshiaki Hara, Kanagawa-ken, JP;
Toshiba Lighting & Technology Corporation, Tokyo, JP;
Abstract
A discharge lamp lighting apparatus includes a discharge lamp having a pair of electrodes, at least one electrode being placed on an outer surface of a discharge vessel containing an inert gas-dominated discharge agent, a high frequency generator having an output transformer and a switching apparatus, a high frequency operation detector for detecting a high frequency and outputting a high frequency operation detection signal, a controlling responsive to the high frequency operation detection signal for performing a feedback control to the switching apparatus to make the high frequency operation detection signal a first level and protecting the apparatus when the high frequency operation detection signal is changed to a second level, and a no-load detector for forcefully changing the high frequency operation detection signal supplied to the controller to the second level when detected the nonleaded state.