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:
Jul. 20, 2010
Filed:
Nov. 10, 2004
Akira Yufuku, Kadoma, JP;
Takeshi Goriki, Kadoma, JP;
Noriyuki Fukumori, Kadoma, JP;
Nobuo Ukita, Himeji, JP;
Akira Yufuku, Kadoma, JP;
Takeshi Goriki, Kadoma, JP;
Noriyuki Fukumori, Kadoma, JP;
Nobuo Ukita, Himeji, JP;
Panasonic Electric Works Co., Ltd., Osaka, JP;
Abstract
A lighting device for lighting a high-pressure discharge lamphaving an outer tube, an interior of which is substantially under vacuum. The lighting device includes a ballasthaving at least a current limiting element and a high-voltage pulse generating circuitfor generating a high-voltage pulse, and also includes a lighting discriminating meansfor discriminating between lighting and non-lighting of the discharge lamp, a timer circuitfor setting a predetermined period of time, and a pulse-stop control meansfor stopping generation of the high-voltage pulse. When the lighting discriminating meansdiscriminates non-lighting after lighting has been discriminated, generation of the high-voltage pulse is stopped within the predetermined period of time set by the timer circuit