Thermal printer and thermal printer control method

Details Thermal printer and thermal printer control method Thermal printer and thermal printer control method

2006-07-24

2009-06-02

Meier, Stephen D (Department: 2853)

Incremental printing of symbolic information

Thermal marking apparatus or processes

Density control

C347S196000

Reexamination Certificate

active

07542060

ABSTRACT:
High print quality from a thermal printer is maintained while the print speed is decreasing without producing white streaks or uneven print density by controlling the hysteresis coefficient of the thermal print head35based on the energizing history of the thermal print head35and print speed control factors used for determining print speed, which is the speed at which the paper is advanced while printing. The thermal printer, comprises a hysteresis coefficient setting unit2for setting a hysteresis coefficient for the print head based on the energizing history of the thermal print head35;an energizing time calculation unit3for calculating the energizing time during which drive signals are to be applied to the thermal print head35for printing based upon the hysteresis coefficient set by the hysteresis coefficient setting unit; a printing control device4for generating the drive signals to be applied to the print head in response to the energizing time calculated by the energizing time calculation unit3; a print speed determination unit5for determining the change in the print speed and when the print speed is decreasing; and a coefficient changing unit6for changing the hysteresis coefficient when a change in print speed occurs causing the print speed to decrease. Preferably the coefficient changing unit changes the hysteresis coefficient to a value greater than the hysteresis coefficient value used immediately before deceleration.

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