Direct color thermal printing method and apparatus therefor

Details Direct color thermal printing method and apparatus therefor Direct color thermal printing method and apparatus therefor

1992-03-13

1993-09-21

Fuller, Benjamin R.

Recorders

Thermal recording

346 76PH, 346 76R, 430148, 430141, 430142, 430146, B41M 526, G01D 900

Patent

active

052473139

ABSTRACT:
A direct color thermal printing method records a full-color image containing black characters on a thermosensitive color recording medium having three laminated thermosensitive recording layers. Three color components of each pixel are sequentially read out from three color frame memories. If all of the three color components of a pixel correspond to the maximum densities, that pixel is determined to be printed in black, and is stored as black pixel data in a black line buffer memory. When recording the black pixels, a thermal head is driven to apply a predetermined maximum amount of head energy to the thermosensitive color recording medium, for simultaneously coloring the three thermosensitive recording layers in accordance with the black pixel data. The black pixel recording may be performed simultaneously with recording a first color frame of the image in a first of the three thermosensitive recording layers which is colored first by applying heat energy of the lowest range when the three thermosensitive recording layers are sequentially developed for recording pixels other than the black pixels.

REFERENCES:
patent: 4734704 (1988-03-01), Mizutani et al.
patent: 4760048 (1988-07-01), Kurihara et al.
patent: 4771032 (1988-09-01), Yamaguchi et al.
patent: 4833488 (1989-05-01), Mizutani et al.

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