Color direct thermal printing method and direct color thermal pr

Details Color direct thermal printing method and direct color thermal pr Color direct thermal printing method and direct color thermal pr

1992-12-04

1996-07-16

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Multicolor

B41M 534, B41M 528, B41J 2325

Patent

active

055371400

ABSTRACT:
A color thermal recording medium has a cyan thermosensitive coloring layer, a magenta thermosensitive coloring layer, and a yellow thermosensitive coloring layer, respectively laminated on a supporting material in this order from the side of the supporting material. The upper layer has a higher thermal recording sensitivity, and is colored with lower heat energy. The color thermal recording medium is thermally recorded by three thermal heads by a one-pass method. The top yellow thermosensitive coloring layer and the adjacent magenta thermosensitive coloring layer are thermally recorded at lower voltages, which are applied to the thermal printers, than the voltage applied for the cyan thermosensitive coloring layer. In this case, the cooling time is shortened within a range for allowing thermal hysteresis to be relieved, and the image pulse duration is set longer. Instead of adjusting the application voltages, the mean resistance values of heating elements may be changed. A color thermal printer is supplied with compressed image data from an input terminal. The compressed image data is temporarily stored in an input buffer memory, and supplied to an expander circuit to expand the compressed image data. By using the expanded image data, a multi-color image is printed out.

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