| 摘要 |
<p>PURPOSE:To improve a printing quality by a method wherein the correction of irregularities caused by a voltage drop is performed by dividing a block into the sufficient number of blocks, ROM tables with which a conduction time according to a supply voltage for every block can be arbitrarily selected are provided, and a printing is conducted with an optimum conduction heating time for every block. CONSTITUTION:ROM tables 51-54 are selected by two items, i.e., the number of a conduction heating stop presently under a binarizing process shown by step counters 41-44, and the output of a drive voltage detection circuit 88 detecting a voltage to be supplied to a heating resistor 10. After times 61-64 complete a time counting of a conduction heating step of one step before, the data is transferred from shift registers 21-24 to latches 31-34 and, synchronously, a time of a next conduction heating step which has been read from the ROM tables 51-54 is loaded in the timers. Furthermore, the values of step counters 41-44 are increased to a step number to be binarized next so that a binarizing process can be again started.</p> |
