Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-11-26
2000-02-01
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
B41J 247
Patent
active
060209097
ABSTRACT:
In a photothermographic laser imaging system including a laser printer for exposing photothermographic media to digital data, a thermal processor for thermally developing the exposed media to render a visual image of the digital data, and a densitometer for reading the density of the visual image; a method for maintaining calibration of the system comprising the steps of: exposing by means of the laser printer successful photothermographic media with digital data and simultaneously with the digital data, density patches on an edge of the media representing minimum density, D.sub.min, and mid density, D.sub.mid ; reading with the densitometer the D.sub.min and D.sub.mid density patches of successive media developed by the thermal processor for a predetermined number of media or over a predetermined interval; averaging the read D.sub.min and D.sub.mid values to obtain average D.sub.min and D.sub.mid values; comparing the averaged D.sub.min and D.sub.mid values with preferred D.sub.min and D.sub.mid values; and if the comparisons are within tolerances, determining that calibration is maintained, but if the averaged D.sub.min value is greater than the preferred D.sub.min value, adjusting the processing temperature of the thermal processor down, and/or if the averaged D.sub.mid value is less than the preferred D.sub.mid value, adjusting the processing temperature of the thermal processor up, or if the averaged D.sub.mid value is greater than the preferred D.sub.mid value, adjusting the processing temperature of the thermal processor down.
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Kocher Thomas E.
Yip Kwok L.
Eastman Kodak Company
Le N.
Noval William F.
Vo A.
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