Thermal gradation printing apparatus

Details Thermal gradation printing apparatus Thermal gradation printing apparatus

1993-11-30

1997-07-01

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Density control

347188, 347189, 347195, 347196, 347190, B41J 236

Patent

active

056443510

ABSTRACT:
In the disclosed thermal gradation printing apparatus, heat elements in a line-type thermal head are divided into a plurality of groups, and an accumulated heat amount in the substrate of the thermal head for each group is estimated based on the pulse width data applied to each heat element considering the influences by heat accumulations in the main-scanning direction and in the sub-scanning direction. Based on the group division estimated accumulated heat amounts and the temperature of the body portion of the thermal head, a correction value for the pulse width data to be applied to each heat element. Moreover, the correction value is applied to the pulse width data for each heat element, so as to output the corrected pulse width data to the thermal head.

REFERENCES:
patent: 4951152 (1990-08-01), Suzuki et al.
patent: 5006866 (1991-04-01), Someya
patent: 5066961 (1991-11-01), Yamashita
patent: 5184150 (1993-02-01), Sugimoto
patent: 5248995 (1993-09-01), Izumi
Yamashita et al, The Journal of the Institute of Image Electronics Engineers of Japan, vol. 22, No. 1, pp. 20-26, "Density Compensating Method to Compensate Dynamic Heat Accumulations for Dye Transfer Printing" .

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