Incremental printing of symbolic information – Thermal marking apparatus or processes – Density control
Patent
1998-06-12
2000-03-28
Tran, Huan
Incremental printing of symbolic information
Thermal marking apparatus or processes
Density control
347186, 347180, 347192, B41J 236, B41J 237
Patent
active
060438320
ABSTRACT:
In an inventive method of driving a thermal head including heating resistors corresponding to a line of dots, the heating resistors are grouped into blocks consisting of the same number of heating resistors. After producing main printing data for one line of printing, such blocks where the ratio of the number of heating resistors in which the printing data is inputted to the number of all the heating resistors in each block is smaller than a preset ratio, are detected as target blocks. Then, auxiliary printing data for preheating such heating resistors in each target block to which the main printing data is inputted, is produced. When the total number of the heating resistors in all the blocks to which the main printing data is inputted is larger than a preset number, the auxiliary strobe signal is inputted to the heating resistors to preheat the heating resistors in the target blocks. By this preheating, the shortage of energy due to voltage drop of a power source will be compensated.
REFERENCES:
patent: 5160941 (1992-11-01), Fujiwara et al.
patent: 5248995 (1993-09-01), Izumi
Harada Hironori
Kanda Kazumi
Brother Kogyo Kabushiki Kaisha
Tran Huan
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