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:
Sep. 06, 2005
Filed:
Jun. 01, 2004
Takeshi Kubota, Minami-Ashigara, JP;
Takeshi Kubota, Minami-Ashigara, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A charging circuit includes an oscillation transformer and an oscillation transistor. The oscillation transistor oscillates at a secondary current returned from a secondary coil in the charging circuit. The oscillation transistor increases/decreases a primary current, which flows from a battery to a primary coil, and flows the secondary current through the secondary coil to charge a main capacitor. The oscillation transistor, which satisfies the following conditions, is used: a DC current gain his 500±10 when a collector-emitter voltage Vis 2V and a collector current Iis 0.5 A, and a DC current gain his 290±10 when the collector-emitter voltage Vis 2V and the collector current Iis 5 A.