Thermal head drive apparatus correcting for the influence on a p

Details Thermal head drive apparatus correcting for the influence on a p Thermal head drive apparatus correcting for the influence on a p

1990-01-30

1992-05-19

Fuller, Benjamin R.

Recorders

Thermal recording

358298, 400120, B41J 236, B41M 526

Patent

active

051152525

ABSTRACT:
A thermal head drive apparatus drives a plurality of heating resistors arranged in one line in a thermal head using image data to print picture elements every one line. The drive apparatus comprises a correcting device for correcting an influence by accumulated heat of the heating resistors using data for correction as to the image data; a calculator for making data for correcting the influence by the accumulated heat of the heating resistors from the image data and the data for correction; a delay device for delaying data from the calculator by one line; and a calculating section for calculating and providing the data for correction to the correcting device and the calculator based on data from the delay device and data before and after the data from the delay device. The apparatus may comprise a first delay device for delaying the image data by a predetermined number of lines; a first calculator for making data for correction by data from the first delay device and delayed data for correction; a first correcting device for correcting an influence amount by the accumulated heat of the heating resistors as to the image data by the data for correction from the first calculator; and a second delay device for delaying the data for correction from the first calculator by one line and providing these delayed data to the first calculator as the delayed data for correction.

REFERENCES:
patent: 4679055 (1987-07-01), Inui et al.
patent: 4816843 (1989-03-01), Sasaki

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