Thermal transfer printer and method of controlling print density

Details Thermal transfer printer and method of controlling print density Thermal transfer printer and method of controlling print density

1991-05-06

1993-04-20

Reinhart, Mark J.

Recorders

Thermal recording

B41J 232

Patent

active

052047040

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.

REFERENCES:
patent: 4587530 (1986-05-01), Noguchi
patent: 4704618 (1987-11-01), Gotoh et al.
patent: 4887092 (1989-12-01), Pekruhn et al.
Development of High-Definition Video Copy Equipment, Hori et al., 1986 IEEE, pp. 283-289.

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