Method and apparatus for producing a facsimile gray scale
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United States of America Patent
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Jun 30, 1981
Grant Date -
N/A
app pub date -
Apr 20, 1979
filing date -
Apr 20, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A facsimile apparatus receives signals representing black, white and various gradations of gray. The apparatus generates a control signal having a magnitude varying with the gradation of gray from white to black corresponding to the gradations of gray at a remotely located document. A stylus for marking on a copy medium is driven by a stylus drive circuitry which generates a stylus drive signal in response to the control signal which is substantially linearly related to the control signal when the magnitude of the control signal is above and below a threshold and has a step change at the threshold.
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