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. 10, 2005
Filed:
Jul. 09, 2003
Eiichi Hayashi, Saitama, JP;
Kazutsugu Ogata, Saitama, JP;
Yuichi Ishiyama, Saitama, JP;
Osamu Shinohara, Saitama, JP;
Satoshi Mikajiri, Saitama, JP;
Eiichi Hayashi, Saitama, JP;
Kazutsugu Ogata, Saitama, JP;
Yuichi Ishiyama, Saitama, JP;
Osamu Shinohara, Saitama, JP;
Satoshi Mikajiri, Saitama, JP;
Fujinon Corporation, , JP;
Abstract
Speed fluctuations at a motor supplied with a two-phase current is reduced by changing the current value ratio at each phase in the drive current to feed a drive motor for an image reader to allow a light source lamp to move, free from speed fluctuations, to scan at a constant scanning speed. The drive motor is supplied with current different in value at each phase from constant current drive circuits, which, in one embodiment, are connected with current regulating variable resistors. An acceleration detector is fixed at the drive motor to detect acceleration fluctuations in rotation of the drive motor to detect speed fluctuations. In some embodiments, thermal control of the motor drive circuit is provided and vibration proofing to isolate the light receptor from the drive motor.