| 摘要 |
<p>PURPOSE:To control energizing time of individual heating element continuously with high precision so as to obtain high quality image by providing transistors to open and close an energizing circuit to the heating elements, latch circuits constituted of a number of bits storing energization time value for each transistor, and a counter circuit for counting energization time. CONSTITUTION:Latch circuits 1 are constituted of a plurality of bits arranged in parallel in the same manner as a print data 3 and all bits are stored at a time by input of a transfer lock signal 4. Outputs of the latch circuits 1 are connected to inputs of counter circuits 2 provided by the same number of heating elements 10 to be energized. At the same time of inputting to the counter circuits, the counter circuits 2 start to count synchronizing with a counter lock signal 5 and outputs a control signal to a transistor 9 so as to close an energizing circuit 11. When a value in the counter circuit 2 becomes 0 by the counting operation, the counter circuit 2 outputs a control signal to the transistor 9 so as to open the energizing circuit 11.</p> |
