Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-11-26
2000-02-08
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347251, 358298, B41J 247, H01S 300, H04N 121
Patent
active
060232854
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 photothermographic media to render a visual image of the digital data and a densitometer for reading the density of the visual image, a method for establishing calibration of the system comprising the steps of: reading optimum thermal processing parameters including processor temperature from a bar code associated with unexposed photothermographic media; setting the thermal processor to operate at the read parameters; exposing a calibration media by the laser printer, the calibration media including a multiple step gray scale pattern including a minimum density step, D.sub.min, and an upper density step, D.sub.UDP ; reading with the densitometer the densities of the multiple step gray scale pattern from the developed calibration media; calculating a code value to optical density look-up-table from the read densities; and if the D.sub.min and D.sup.UDP values are within tolerances, using the calculated look-up-table to process successive media; but if the D.sub.min is greater than a predetermined value, adjusting the thermal processor temperature down, and if said D.sub.UDP is less than a predetermined value, adjusting the thermal processor temperature up.
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Kocher Thomas E.
Yip Kwok L.
Anderson L.
Eastman Kodak Company
Le N.
Noval William F.
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