Incremental printing of symbolic information – Thermal marking apparatus or processes – Density control
Patent
1993-06-02
1995-08-29
Tran, Huan H.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Density control
B41J 237, B41J 236
Patent
active
054464757
ABSTRACT:
A thermal print head including a line of electrically resistive heating points and electronic controls for controlling sequential connection to a power supply providing electrical current, and including for each heating point a countdown register which is loaded prior to printing each line of points with a value corresponding to the length of time during which a connection should be maintained with the corresponding heating point starting from a print authorization instant common to all of the points. According to the invention, the print head includes sensors for sensing the resistance of each heating point in real time, which sensors are connected to a circuit for regulating the amount of energy actually supplied to the corresponding point.
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Axioohm
Tran Huan H.
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