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:
Aug. 02, 2011
Filed:
May. 23, 2007
Nobutoshi Matsuzaki, Neyagawa, JP;
Kenichi Fukuda, Burlington, MA (US);
Nobutoshi Matsuzaki, Neyagawa, JP;
Kenichi Fukuda, Burlington, MA (US);
Panasonic Electric Works Co., Ltd., Osaka, JP;
Abstract
In order to optimally control power outputted from a high intensity discharge lamp lighting device for a difference among loads connected thereto, such as a difference in gas components contained in arc tubes and a difference in shape of the arc tubes individually in a plurality of discharge lamps, plural kinds of output power characteristics W, Wand Was data tables of lamp voltage-lamp power are provided for a rating lamp voltage range of each of the high intensity discharge lampsand a lamp voltage range lower than the rating lamp voltage range, there is provided minimum lamp voltage detecting meansfor allowing predetermined power to be outputted in an event of starting the high intensity discharge lamp, and detecting a minimum lamp voltage Vmin after the high intensity discharge lamp shifts to an arc discharge, and in response to that the detected minimum lamp voltage Vmin enters any range of a plurality of preset voltage ranges A, B and C, any of the data tables W, Wand Wof the lamp voltage-lamp power, which correspond to the voltage ranges A, B and C, respectively, is selected.