Incremental printing of symbolic information – Thermal marking apparatus or processes – Multicolor
Patent
1994-04-26
1997-03-11
Tran, Huan H.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Multicolor
B41J 232
Patent
active
056106491
ABSTRACT:
A color thermal printing method capable of preventing a color registration shift and shading is unable with a color thermosensitive recording sheet having cyan, magenta, and yellow thermosensitive coloring layers, respectively formed on a base in this order. A thermal sensitivity becomes lower the nearer the thermosensitive coloring layer is to the base. The thermosensitive coloring layer having a lower sensitivity is printed at an earlier timing to make the centers of three color print areas coincident with each other. According to a preferred embodiment, a preliminary pressed running section is provided in front of each print area. In the preliminary pressed running section, a thermal head is preheated and pressed against a color thermosensitive recording sheet. In order to reduce a change in the friction coefficient between the preliminary pressed running section and the print area, the heat energy for the preheating is set to a bias heat energy having a level just under a coloring energy. This bias heat energy having a level just under a coloring energy changes with color so that the preliminary pressed running section is set differently for each color. During the preliminary pressed running operation, a pulse motor for driving a platen drum is driven by the same predetermined number of drive pulses for all three colors.
REFERENCES:
patent: 4734704 (1988-03-01), Mizutani et al.
Fuji Photo Film Co. , Ltd.
Tran Huan H.
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