EP 0627319 B1 19990616 - Method for correcting across-the-head unevenness in a thermal printing system
Title (en)
Method for correcting across-the-head unevenness in a thermal printing system
Title (de)
Verfahren zum Korrigieren der Ungleichmässigkeit in einem Thermodrucksystem
Title (fr)
Procédé pour corriger le manque d'uniformité dans un système d'impression thermique
Publication
Application
Priority
- EP 94201310 A 19940510
- EP 93201534 A 19930528
Abstract (en)
[origin: EP0627319A1] A method for printing by thermal sublimation is provided, comprising the steps of: 1) supplying uncorrected input data Ii,u to a processing unit of a printer having a head with a plurality of heating elements; 2) obtaining density correction means Mi,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 i of the density from a density aimed at by applying said power; d) calculating for each heating element a density correction means Mi,d taking into account said deviation delta i; e) storing each of said density correction means Mi,d; 3) combining the respective uncorrected input data Ii,u with the respective density correction means Mi,d; 4) providing the thus corrected data to the thermal head. <IMAGE>
IPC 1-7
IPC 8 full level
B41J 2/36 (2006.01)
CPC (source: EP)
B41J 2/36 (2013.01)
Designated contracting state (EPC)
BE DE FR GB NL
DOCDB simple family (publication)
DOCDB simple family (application)
EP 94201310 A 19940510