Color image forming apparatus

Details Color image forming apparatus Color image forming apparatus

1996-07-24

1998-10-13

Wong, Peter S.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347115, 347119, 347128, 347232, 347247, 347248, 399301, 399302, G03G 1501, B41J 247

Patent

active

058219706

ABSTRACT:
In a color image forming apparatus, a plurality of color images of component colors are combined to form a full color image. These images of the component colors are overlapped on an intermediate recording medium, and are then transferred to a transfer medium. Control circuitry reduces the amount of time required to form the component color images on the intermediate transfer medium, and to prevent an abnormality such as an out-of-phase or pull-out of a closed loop control circuit for controlling such a formation of the component color images. This may be achieved by abruptly changing a phase of a motor synchronizing signal. Further, for a period of time after the motor synchronizing signal is abruptly changed, a gain of an amplifier in the motor control circuit can be reduced, an abnormality detection in the motor control circuit can be reduced, the motor control circuit can be placed in an open loop state, or an addition or subtraction signal can be input to the closed loop motor control circuit. This specified period can also be detected based on a feedback including a rotational phase of a polygon motor formed as part of a unit for writing the individual component color image signals.

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