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. 05, 2008
Filed:
Aug. 05, 2005
Masato Tanaka, Tokyo, JP;
Yasuo Hosaka, Gunma, JP;
Mamoru Sakamoto, Gunma, JP;
Akinobu Maekawa, Gunma, JP;
Hidefumi Nakagome, Gunma, JP;
Masato Tanaka, Tokyo, JP;
Yasuo Hosaka, Gunma, JP;
Mamoru Sakamoto, Gunma, JP;
Akinobu Maekawa, Gunma, JP;
Hidefumi Nakagome, Gunma, JP;
Taiyo Yuden, Ltd., Gunma, JP;
Microspace Corporation, Tokyo, JP;
Abstract
The present invention relates to a lamp lighting technique for lighting multiple lamps safely without luminance irregularities. The present lamp lighting circuit includes multiple closed loops wherein a predetermined number of lamps and the secondary windings of the predetermined number of transformers are connected serially. At least one of the primary windings of the transformers employed for each closed loop is connected to the primary winding of the transformer employed for another closed loop serially. Thus, current of the lamps included in the closed loop is made uniform, and also current is made uniform even between the closed loops by connecting the primary windings of the transformers serially. According to the present invention, with regard to serial connection of the primary windings of the transformers, even if the number of transformers is limited, current uniformity can be propagated to the entirety by subjecting closed loops to catenation consecutively.