Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-05-29
2000-11-14
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347251, 399 49, 399 55, 399 66, 399 72, B41J 247
Patent
active
061476986
ABSTRACT:
A method and apparatus for controlling the density of the printed medium of a printer is provided and comprises the following steps. First a control strip is printed on the print medium having at least two coverage patches having a first and second different standard density. Next, the optical density of each of the patches are measured. Next a first and second tolerance limit is determined for the first and second patch, respectively. The next step is to determine whether the measured optical density of the first patch is within a first tolerance of the first standard density. If the first measured optical density is not within tolerance of the first standard density, then a change of at least one printer parameter is calculated such that the first density is corrected within the first tolerance. Then the effect of the change of the printer parameters on the second optical density is determined. If the second optical density with the effect is not within the second tolerance, then a change of at least one other printer parameter is calculated so that the second optical density with the effect is within the second tolerance, while the first optical density is still within its tolerance. Next, new printer parameter settings are calculated from the printer parameter changes. Last, the printer parameters are automatically adjusted to the new settings.
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Decker William Chesley
Zable Jack Louis
Hogg William N.
International Business Machines - Corporation
Le N.
Pham Hai C.
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