| 摘要 |
<p>PURPOSE:To achieve increase of a printing speed, by a method wherein different voltages are supplied to a main power conduction block and a sub power conduction block by dividing the power conduction block into a main power conduction block where present drive data are outputted and a plurality of sub power conduction blocks corresponding to past drive data. CONSTITUTION:A unit circuit HCU 3 is accessed with a decoder 16 and has an input terminal 5 of a data bus 5, an input terminal 6 of low order two bits of an address bus, an input terminal 8 of data latch timing which inputs a WR output of CPU, input terminals 9, 10 of a power conduction signal for deciding a power conduction time of a heating element 1a, and further a power conduction block signal output terminal 19. Further, a power source circuit 60 has two kinds of high and low voltages, 61 is a zener diode which generate a reference voltage Vz, 62 being an operational amplifier, 63 being an amplifier, 64, 65, 67 being resistors, and 66 is TRS. Then, for this output electric potential Vh, a relation of Vh1<Vh2 between a voltage Vh1 when TRS 66 is off and a voltage Vh2 when on holds and TRS 66 functions for controlling voltage.</p> |
