Incremental printing of symbolic information – Thermal marking apparatus or processes – Density control
Patent
1994-01-14
1997-02-18
Tran, Huan H.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Density control
347184, B41J 236, B41J 2365, B41J 237
Patent
active
056045263
ABSTRACT:
A correction apparatus for a thermal printer includes a memory for storing the deviation quantity of each heating element of a thermal print head or a temperature correction quantity, a first computer means for adding introduced image data and the deviation quantity wherein the gradation value of the image data is reflected when the heating element for printing the introduced image data is lower than the average resistance value or the current temperature, a second computer means for subtracting the deviation quantity wherein the gradation value of image data is reflected, from the introduced image data when the heating element for printing the introduced image data is higher than the average resistance value or the current temperature. Thus, the resistance correction according to the deviation of the heating element resistance and the temperature correction are realized by a simple circuit, thus reducing the memory capacity, which decreases the amount of required hardware.
REFERENCES:
patent: 4540991 (1985-09-01), Kariya et al.
patent: 4801948 (1989-01-01), Kato
patent: 5153605 (1992-10-01), Ohara et al.
Samsung Electronics Co,. Ltd.
Tran Huan H.
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