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:
Jan. 10, 2006
Filed:
Jun. 18, 2004
Syunsuke Ono, Takatsuki, JP;
Minoru Ozasa, Kyoto, JP;
Masahiro Yamamoto, Takatsuki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A lighting method for a high pressure discharge lamp in which a high-pressure pulse is applied to cause a dielectric breakdown, and then in step S, it is judged whether the lamp voltage is higher than 25 volts as the current switching voltage. If it is judged negatively in step S, the control circuit () performs a constant current control with the current limiting level set to 6 amperes (step S). If it is judged that the lamp voltage is higher than 25 in step S, the control circuit () performs a constant current control with the current limiting level set to 4 amperes (step S). When the lamp voltage rises and reaches 50 volts, the control circuit () performs a constant power control so that the lamp power remains to be 200 W.