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:
Dec. 07, 1993
Filed:
Feb. 12, 1992
Masaki Sakamoto, Morioka, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
A heating elements' row provided in the thermal head is separated into at least three blocks each including a plurality of heating elements. When each heating element is heated by turning on electricity, the last heat accumulation amount of said each heating element is calculated, as well the last sum of heat accumulation amounts in each block is calculated. And, the calculated amount of the sum of the heat accumulation amounts in each block is corrected in accordance with the position of each block in the heating elements' row. Subsequently, the time period for turning on electricity to each heating element is determined based on said calculated amount of last heat accumulation amount of said each heating element and said corrected amount of last sum of heat accumulation amount of each block, thereby adequate control of time period for turning on electricity can be performed so as to response to actual heat accumulation condition in each heating element. As a result, the printing operation is carried out excellently so as not to cause undesirable printing density difference among heating elements laid in a row.