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. 27, 1991
Filed:
Feb. 08, 1990
Tomohiko Matsumoto, Iwai, JP;
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.