End pulse width modulation for digital image printer with halftone gray scale capability
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United States of America Patent
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Dec 6, 1994
Grant Date -
N/A
app pub date -
Nov 25, 1991
filing date -
Nov 25, 1991
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A gray scale printer modulates an exposure source in both amplitude and duration such that the exposure source is actuated during the latest portion of each pulse time period. For exposure periods having actuation times that are very short relative to the decay period of the amplitude-modulating electronics, actuation time of the exposure source for very short exposure periods may be timed to end before the start of the decay period. If the amplitude modulating means includes electronics having a ramping up period before producing a stable output, the actuation of the exposure source occurs during each pulse time period only after the ramping up period has substantially expired.
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