Reduction of imaging artifacts in a platesetter having a diffractive modulator
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United States of America Patent
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Mar 25, 2008
Grant Date -
Dec 9, 2004
app pub date -
May 13, 2004
filing date -
May 14, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A platesetter may have an optical imaging head which includes a diffractive modulator having individually controlled ribbons associated with individual pixels imaged onto a printing plate. One method for reducing artifacts transferred to a medium includes the steps of: determining values of intensity versus pulse width variations for each ribbon of the modulator based upon empirical data; weighting the determined values according to a predetermined weighting factor dependent upon physical, optical, chemical and structural characteristics of a printing plate to yield an image on the printing plate having minimum visible artifacts; and applying the weighted values to ribbon drivers of the modulator.
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