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. 30, 2010
Filed:
Nov. 02, 2006
Go Yamada, Osaka, JP;
Syunsuke Ono, Osaka, JP;
Tsuyoshi Ichibakase, Yamaguchi, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An object of the present invention is to provide a lighting method and the like that can prevent a lamp temperature of each individual high-pressure mercury lamp from being beyond a proper temperature range of a halogen cycle. The lighting method maintains a discharge of the high-pressure mercury lamp that has a function of the halogen cycle. The control is performed as follows. From when the high-pressure mercury lamp is lighted up to when a lamp voltage Vla reaches a first voltage value V, a constant current control is performed. When the lamp voltage Vla reaches the first voltage value V, the constant current control is switched to a constant power control which is performed at a first power value W. While the discharge of the lamp is maintained, when the lamp voltage Vla reaches a voltage value (second voltage value V) at which a state of the halogen cycle deviates from a proper state, the constant power control is performed by reducing the first power value Wto a second power value W