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:
May. 05, 2015
Filed:
Feb. 24, 2014
Phoenix Electric Co., Ltd., Himeji-shi, Hyogo, JP;
Shinichi Ushijima, Himeji, JP;
Tetsuya Gouda, Himeji, JP;
Phoenix Electric Co., Ltd., Hyogo, JP;
Abstract
It is an object of the present invention to provide a lighting circuit for and a lighting method of a high-pressure discharge lamp whereby remarkable reduction in illuminance maintaining rate can be avoided by reducing variation in inter-electrode distance in the beginning of usage without modulating a lighting frequency. The object can be achieved by a lighting circuit configured to light a high-pressure discharge lamp by supplying an alternating lamp current, which includes at least one pulse current superimposed on the former half of each half period of a base lamp current and at least two pulse currents and superimposed on the latter half of each half period, to the high-pressure discharge lamp.