Method for correcting across-the-head uneveness in a thermal pri

Details Method for correcting across-the-head uneveness in a thermal pri Method for correcting across-the-head uneveness in a thermal pri

1994-05-24

1998-08-18

Fuller, Benjamin R.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Density control

347191, B41J 236, B41J 237, B41J 2365

Patent

active

057964203

ABSTRACT:
A method for printing by thermal sublimation is provided, comprising the steps of: 1) supplying uncorrected input data I.sub.i,u to a processing unit of a printer having a head with a plurality of heating elements; 2) obtaining density correction means M.sub.i,d for improving across-the-head uneveness according to the steps of: a) activating each heating element with power compensated input data, so that a same time-averaged power is generated in each heating element; b) measuring the printing density of pixels; c) estimating for each heating element the deviation .delta..sub.i of the density from a density aimed at by applying said power; d) calculating for each heating element a density correction means M.sub.i,d taking into account said deviation .delta..sub.i ; e) storing each of said density correction means M.sub.i,d ; 3) combining the respective uncorrected input data I.sub.i,u with the respective density correction means M.sub.i,d ; 4) providing the thus corrected data to the thermal head.

REFERENCES:
patent: 4801948 (1989-01-01), Kato
patent: 4827279 (1989-05-01), Lubinsky et al.
patent: 4918462 (1990-04-01), Tomita et al.
patent: 5160941 (1992-11-01), Fujiwara et al.
Sasaki et al High Quality Recording in Thermal Dye Transfer Printing- 478-484 Nov. 89.

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