Incremental printing of symbolic information – Thermal marking apparatus or processes – Density control
Patent
1996-01-25
1998-08-11
Tran, Huan H.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Density control
B41J 236
Patent
active
057934037
ABSTRACT:
A method of controlling a thermal print head having a plurality of resistive heaters to compensate for the effects of latent heat from the resistive heaters is disclosed. The plurality of resistive heaters are arranged in a line on a substrate with each of the plurality of resistive heaters corresponding to a pixel position on a medium such as paper. A compensation value is determined for each pixel in a line such that the effects of latent heat from the corresponding heater and from adjacent heaters are compensated. A compensated gray level for each pixel of the line is calculated as a function of a desired gray level for the particular pixel in the line and as a function of the associated compensation value. Finally, the heaters are driven as a function of the compensated gray levels to print the corresponding pixels of the line.
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Fargo Electronics Inc.
Tran Huan H.
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