Raster scanner variable-frequency clock circuit

Details Raster scanner variable-frequency clock circuit Raster scanner variable-frequency clock circuit

1984-05-29

1987-01-27

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

328 63, 358264, 358267, 377 50, H04N 104, H04N 136

Patent

active

046397892

ABSTRACT:
A circuit for correcting for polygon drive motor velocity irregularities in a flying spot scanner is described. A crystal controlled oscillator is used to generate the system clock. As the motor speeds up, or slows down, pulses are subtracted, or added, to the stream of clock pulses so that the data bit stream will always occupy the same line length on the page regardless of polygon velocity variations.

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"Correcting Method for Light Scanning Error of Rotating Polygon Mirror", IEEE-Denshi Tsushin Gakkai of Japan, vol. J66, No. 2, Tadashi Matsuda et al.
"A Correction Method for Laser Scanning Errors in High Speed Laser Prints", Fujitsu Sci. and Tech., vol. 18, No. 4, pp. 579-594, Tomohisa Mikami et al.

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