Thermal transfer printer and method of controlling print density in thermal transfer printing using the same
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United States of America Patent
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Apr 20, 1993
Grant Date -
N/A
app pub date -
May 6, 1991
filing date -
May 11, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
A method of controlling printed density in thermal transfer printing includes the steps of: forming a density table representing relation between input energy and actual printed density when there is no temperature gradient in a thermal head; determining a temperature gradient coefficient for estimating a temperature gradient between a heating element and a temperature detector in the thermal head for the nth line; and calculating density correcting amount based on a ratio of the temperature gradient coefficient of the nth line to the temperature gradient coefficient when the thermal head is at a steady temperature gradient state. Apparatus is also provided for carrying out the method.
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