Clock signal generator for electrophotographic printers

Details Clock signal generator for electrophotographic printers Clock signal generator for electrophotographic printers

1992-11-02

1995-08-01

Wong, Peter S.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

358409, G01D 942

Patent

active

054383536

ABSTRACT:
A new and improved method and system for controlling the timing of a modulation input signal utilized for driving a laser engine of a laser or electrophotographic printer. This method and system utilizes a novel modulation generator circuit which operates to receive both a beam detect signal from the laser driver circuit and an asynchronous clock signal from the output of an asynchronous clock generator. The modulation generator in turn operates to delay the output signal from the asynchronous clock generator a predetermined number of times and then select the delayed clock signal which is closest in phase to the phase of the beam detect signal. Then this clock generated signal is used to set the modulation frequency of a bi-phase output digital clock signal from the modulation generator which is applied as input timing signal for video input data applied to laser driver circuit and used for developing images on a photoconductive drum.

REFERENCES:
patent: 4677292 (1987-06-01), Shimada
patent: 4796095 (1989-01-01), Shimada
patent: 5014137 (1991-05-01), Shimada
patent: 5081477 (1992-01-01), Gibson
An Introduction to Computer Logic by H. Troy Nagle et al., Copyright 1975 (pp. 228-229).

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