The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 18, 1998
Filed:
May. 24, 1994
Eric Kaerts, Melsele, BE;
Paul Verzele, Beveren, BE;
AGFA-Gevaert, Mortsel, BE;
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.