INTEGRATED CIRCUIT FOR DRIVING THERMAL HEAD

摘要

PROBLEM TO BE SOLVED: To restrict a circuit size when a plurality of colors are to be printed by one heat-generating resistance body. SOLUTION: An inverter 12 of a large L length is directly connected as a delay element to each gate of driving transistors 2 for controlling the power supply to heat-generating resistance bodies 1. An output terminal of a NOR circuit 13 is connected to the inverter 12, so that print data DATr, DATb are input by strobe signals STBr, STBb to two input terminals of the NOR circuit 13 respectively. Accordingly, one delay element is enough per bit, and a delay time at each bit of the print data when output becomes equal among gradations and colors. A switching speed of each driving transistor for each color becomes equal and a print quality is improved.