Fuji Photo Optical Co., Ltd.

Fujinon Corporation

Osamu Shinohara

Eiichi Hayashi

Yuichi Ishiyama

Satoshi Mikajiri

Kazutsugu Ogata

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.

Method and device for pacing an image reader at a constant scanning speed

A vibration attenuating mechanism and method is disclosed for the purpose of maintaining a high quality of image reading or writing while scanning a document with an image processing device which includes a carriage that supports an optical scanning element, a motor which drives the optical scanning element so as to scan a document for either reading or writing data, and a housing which supports the optical scanning element and the motor. At least one of a weight or a vibration absorbing material is provided nearby the motor so as to reduce vibrations which are transferred from the motor to the optical scanning element. In this way, the quality of image reading is maintained despite the recent trend toward increased scanning speeds.

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Saitama, Japan

Osamu Shinohara