Parasitic resistance compensation for a thermal print head

Details Parasitic resistance compensation for a thermal print head Parasitic resistance compensation for a thermal print head

1992-11-24

1995-11-21

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Density control

358298, B41J 2325

Patent

active

054692032

ABSTRACT:
A compensation method and apparatus which achieves, despite parasitic voltage drops caused by a portion of all heating elements in a print line, the desired print density for a given heating element or pixel when multiple heating elements are enabled. A weighted average of the desired digital level of all heat elements in a print line is used to determine an offset power level, which then is used to compensate for power variations at each heat element by adjusting the number of digital signals to each heating element according to the offset power level. This adjustment results in an actual achieved print density that is equivalent to the desired density, despite complications caused by print lines having different desired densities but equivalent density averages.

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