Incremental printing of symbolic information – Thermal marking apparatus or processes – Having driving circuitry for recording means
Patent
1994-08-31
1997-03-04
Tran, Huan H.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Having driving circuitry for recording means
347191, B41J 236
Patent
active
056084420
ABSTRACT:
A thermal printer includes a thermal print head having a plurality of heating elements for printing dots. A source of drive pulses operates respective heating elements. Each drive pulse is modulated to provide first and second periods of the drive pulse to selectively energize the respective heating element, the first and second periods defining a selected energy level. A memory stores the modulated drive pulses and supplies respective modulated drive pulses to the respective heating elements. A measuring circuit measures a heating factor of each heating element and provides a correction factor for each heating element based on the respective measured heating factor. The correction factors are combined to the respective drive pulses to alter the first and second periods, thereby reducing variations in dots due to differences in the heating factors of the heating elements.
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Bennefeld David H.
Elliot Jonathan D.
Gilbert John M.
Vatland Danny J.
LaserMaster Corporation
Tran Huan H.
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