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:
Jul. 03, 2007
Filed:
Jul. 28, 2005
Hiroshi Shinmen, Iwata-gun, JP;
Mitsuo Matsushima, Iwata-gun, JP;
Kohei Nishibori, Iwata-gun, JP;
Minebea Co., Ltd., Nagano, JP;
Abstract
A discharge lamp lighting apparatus is provided for lighting a plurality of discharge lamps including one reference lamp and at least one controllable lamp. First variable inductance element and lamp current detecting unit are connected to the reference lamp, second variable inductance and lamp current unit are connected to the controllable lamp, and a lamp current controlling circuit is connected to each of the first and second variable inductance elements. An output signal from the second lamp current detecting unit and also an output signal as a reference signal from the first lamp current detecting unit are connected to the lamp current controlling circuit for the controllable lamp, whereby the lamp current of the controllable lamp is controlled. The reference output signal is also connected to a control circuit, and the lamp currents of the reference and controllable lamps are controlled further by the on/off operation of the switching elements.