Color image forming apparatus with scanner motor synchronization

Details Color image forming apparatus with scanner motor synchronization Color image forming apparatus with scanner motor synchronization

1998-08-25

2000-07-25

Pendegrass, Joan

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347235, G03G 1504

Patent

active

060942088

ABSTRACT:
In this digital color copier, laser beam scanner units of the same configuration are arranged in parallel with each other, and all are controlled in a unified manner by a laser control unit provided outside the units. In order to synchronously rotate the polygon mirrors in a precise manner, the speeds of rotations of their motors, fed back from tacho-generators are compared to the reference frequency generated from an oscillator so as to allow a motor control circuit to control the driving motors of the polygon mirrors. Further, the BD signals from beam detectors (BD) are fed back to the laser control unit so that all the BD signals from the laser scanner units for black and the three colors can become synchronized with each other, thus enabling control of the polygon mirrors.

REFERENCES:
patent: 5381165 (1995-01-01), Lothus et al.
patent: 5808658 (1998-09-01), Hoover
patent: 5933182 (1999-08-01), Appel

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