G - Physics – 03 – G
Patent
G - Physics
03
G
313/27
G03G 13/00 (2006.01) G03G 15/00 (2006.01) G03G 15/041 (2006.01)
Patent
CA 1162585
ABSTRACT The present invention relates to a microprocessor control of optical components for variable magnification, the control including a bi- directional AC motor, a reference potentiometer, an analog to digital (A/D) converter, and triacs for driving the motor. The potentiometer voltage represents the present position of the optical components in the reproduction machine. The position of the optical components determines the actual magnification ratio of images. Upon selection of a particular magnification ratio, a digital position word from memory corresponding to the selected magnification ratio is compared to the optical component current position voltage converted through the A/D converter. Depending upon the error signal generated by the compare operation, a run bit is set to activate the motor in the direction to minimize the error signal and position the optical components to achieve the magnification ratio selected. In another feature of the present invention, as the optical components near the desired locations, the motor is selectively pulsed to progressively decrease the duty cycle of operation. For example, the duty cycle of operation is decreased from 100 percent to 70 percent, 50 percent, and 30 percent to slowly position the optical components and minimize inertia effects.
386953
Sim & Mcburney
Xerox Corporation
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