Direct color thermal printing method

Details Direct color thermal printing method Direct color thermal printing method

1995-02-15

1997-12-16

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Multicolor

347186, B41J 232, B41M 528

Patent

active

056991002

ABSTRACT:
A direct color thermal printing method supplements coloring density in a print start area for each color frame of a full-color image to be printed in a three color sequential fashion. A color thermosensitive recording sheet has cyan, magenta and yellow thermosensitive coloring layers formed on a base in this order. The heat sensitivities of the coloring layers become the lower the nearer to the base. Since the coloring density tends to be insufficient in the beginning of printing due to the temperature of the thermal head, supplementary drive pulses for supplementing coloring density is applied to each heating elements in addition to drive pulses for coloring. The supplementary heat energy is predetermined to be lower, the higher the line number from a print start position of the print area, and the higher the heat sensitivities of the thermosensitive coloring layers.

REFERENCES:
patent: 4636810 (1987-01-01), Asakura et al.
patent: 4734704 (1988-03-01), Mizutani et al.
patent: 4872772 (1989-10-01), Tsukamoto

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