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:
Apr. 20, 1993
Filed:
May. 06, 1991
Applicant:
Inventors:
Assignee:
Sanyo Electric Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41J / ;
U.S. Cl.
CPC ...
346 / ;
Abstract
A method of controlling printed density in thermal transfer printing includes the steps of: forming a density table representing relation between input energy and actual printed density when there is no temperature gradient in a thermal head; determining a temperature gradient coefficient for estimating a temperature gradient between a heating element and a temperature detector in the thermal head for the nth line; and calculating density correcting amount based on a ratio of the temperature gradient coefficient of the nth line to the temperature gradient coefficient when the thermal head is at a steady temperature gradient state. Apparatus is also provided for carrying out the method.