Image reader

Details Image reader Image reader

1997-10-22

1999-12-28

Moses, Richard

Electrophotography

Image formation

Exposure

399210, 399211, 358412, 358486, 358497, G03G 2100, G03G 2116

Patent

active

060092920

ABSTRACT:
A drive control mechanism for an image reader having a controller, to control a drive current impressed to a connected stepping motor such that the impression of the drive current is carried out in a prescribed number of steps, and a changer, to change a largest value of a drive current in response to a scanning speed of a reading device of the image reader. Consequently, smooth rotation with little torque ripple may be obtained through microstep driving, and by changing a largest drive current, control of a drive torque becomes easier, thus making it possible to maintain an even balance between load torque and drive vibration when a high-torque motor is used to eliminate slider vibration.

REFERENCES:
patent: 5198909 (1993-03-01), Ogiwara et al.
patent: 5583620 (1996-12-01), Miyamoto

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