Importance

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Abstract

A vibration preventive system in use with an image recording apparatus of the type in which an original is scanned by reciprocatively moving an imaging unit by a stepping motor in two different types of scan modes, a forward scan mode in which an original read region is a constant speed region and a back scan mode to return the imaging unit to an original position at a high speed, the vibration preventive system comprising a drive current control for controlling a drive current fed to the stepping motor in such a way that in the constant speed region, drive current for driving the stepping motor is changed to a value smaller than that in an acceleration region. In the forward scan mode, the drive current is changed before the imaging unit reaches the registration position or after the end of acceleration in the forward scan mode. When the imaging unit is between them, the drive current is changed at a point in the undershoot of a transient vibration after the end of acceleration, or at the tail edge of the forward scan mode.

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First Claim