| 摘要 |
PURPOSE:To manufacture a serial type thermal printer, which operates at high speed and has the excellent quality of printing, by stopping some time within the reference conduction time by the memory result of a memory means and reducing conduction energy to a heating element. CONSTITUTION:When a trigger input Tg is applied to an IN terminal, charging to a capacitor 31 is started through a resistance circuit containing a thermistor 34. When charging to the capacitor 31 reaches a predetermined charging level, pulses having pulse width TW are outputted from an output terminal OUT for a comparison circuit 37. Pulse width proper to the temperature of a thermal head at that time by the characteristics of a thermistor detecting the temperature of the thermal head can be given as the pulse width of the pulses. Since the output as the pulses is used directly as the reference conduction time of the thermal head, a power supply terminal for a driver is turned ON-OFF, thus supplying a heating element 2 with proper printing energy. |
