Correction of printing signal to be supplied to thermal head of

Details Correction of printing signal to be supplied to thermal head of Correction of printing signal to be supplied to thermal head of

1990-02-08

1991-08-27

Fuller, Benjamin R.

Recorders

Thermal recording

346 11, G01D 1510

Patent

active

050437429

ABSTRACT:
A data correction apparatus corrects a printing data signal to be supplied to a thermal printer having a printing head constructed with heating elements aligned in a main scanning direction. The data correction apparatus includes an estimation circuit for estimating a thermal state of the print head supplied with the printing data signal. The estimation circuit includes an integration circuit for integrating the printing data signal corresponding to each of a plurality of dots to be printed by the print head, and an equalizing circuit for averaging an output of the integration circuit in one main scanning period and for equalizing an output level of the integration circuit to a level of the averaging result. Also included in the data correction apparatus is a correction circuit in which a level of the printing data signal is corrected in response to an output of the estimation circuits.

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