Incremental printing of symbolic information – Thermal marking apparatus or processes – Density control
Patent
1996-06-04
1999-03-30
Le, N.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Density control
B41J 236, B41J 2365
Patent
active
058895469
ABSTRACT:
A heat accumulation control device is provided to control printing responsive to residual-heat values which remain in head elements of a thermal head in a line-type thermoelectric printer due to previous printing operation. The heat accumulation control device contains a line buffer for storing input data, which are supplied thereto from the printer or an external device, and a residual-heat-value storing memory which is capable of storing one line of residual-heat values corresponding to the head elements respectively. A correction calculation section performs correction calculations, using parameters, based on the input data, outputted from the line buffer, and a residual-heat value which is read out from the residual-heat-value storing memory with respect to a specific head element to be currently driven, so that print data are calculated. Thus, the specific head element is driven so that a dot is printed on a paper in a density corresponding to the print data. Further, a residual-heat-value calculation section performs calculations, using parameters, based on the print data and the residual-heat value read out from the residual-heat-value storing memory together with at least another one residual-heat value of a head element which is positioned adjacent to the specific head element in the thermal head, so that a new residual-heat value is produced with respect to the specific head element and is newly stored in the residual-heat-value storing memory.
REFERENCES:
patent: 5644351 (1997-07-01), Matsumoto et al.
Anderson L.
Le N.
Shinko Electric Co. Ltd.
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