Recorders – Thermal recording
Patent
1992-02-12
1993-12-07
Fuller, Benjamin R.
Recorders
Thermal recording
346 11, B41J 2365
Patent
active
052687066
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.
REFERENCES:
patent: 4514738 (1985-04-01), Nagato et al.
patent: 4590487 (1986-05-01), Noguchi et al.
patent: 5115252 (1992-05-01), Sasaki
Alps Electric Co. ,Ltd.
Bever Patrick T.
Fuller Benjamin R.
Shoup Guy W.
Tran Huan
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