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, 2004
Filed:
Jul. 18, 2001
Atsuji Nakagawa, Himeji, JP;
Toshitaka Hujii, Himeji, JP;
Hisao Hurukawa, Himeji, JP;
Tomihiko Ikeda, Himeji, JP;
Tetsuya Shirai, Himeji, JP;
Phoenix Electric Co., Ltd., Himeji, JP;
Abstract
There is provided a novel method of lighting an ultra-high pressure discharge lamp (A ) having a discharge bulb ( ) made of quartz glass in which a pair of electrodes ( ) and ( ) are disposed facing each other, the method including: lighting the lamp with alternating current; and providing a time period of at least one second for which the alternating current assumes a lighting frequency of 5 Hz or lower during a period for which the lamp lights, wherein the electrodes ( ) and ( ) each have a current withstanding capability against a current 1.5 times or more as high as a current value at which the lamp lights stably. This method enables the ultra-high pressure discharge lamp to have a longer life and exhibit a higher luminance.