Method and apparatus for jitter correction of a polygon mirror i

Details Method and apparatus for jitter correction of a polygon mirror i Method and apparatus for jitter correction of a polygon mirror i

1987-10-28

1989-10-03

Groody, James J.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358408, H04N 110

Patent

active

048720658

ABSTRACT:
A clock generator (15) and a delay circuit (16) create N dot recording clock signals (.phi..sub.1 to .phi..sub.N) of a cycle t, delayed by t/N. A counter (20) counts a detecting time interval between a start sensor (12) and an end sensor (14) for every surface of a polygon mirror (8) to generate time resolution t/N. The difference between the count value and a reference count value set in a latch (24) is input to a subtracter (23), so that a translation table (28) outputs clock crossover timing responsive to the difference. A latch (17) and an encoder (18) select an N dot recording clock signal synchronous with detection output of the start sensor (12) for every surface of the polygon mirror (8). A second selector (33) outputs a crossover dot recording clock signal (.phi..sub.X) for image recording by performing crossover from the selected dot recording clock signal to other dot recording clock signals that are sequentially along the clock crossover timing.

REFERENCES:
patent: 4032888 (1977-06-01), Broyles et al.
patent: 4251825 (1981-02-01), Mikami et al.
patent: 4635000 (1987-01-01), Swanberg
patent: 4677292 (1987-06-01), Shimada
Toyen, Gerald, "Generation of Precision Pixel Clock in Laser Printers and Scanners", SPIE, vol. 84, pp. 138-145.

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