| 摘要 |
<p>PURPOSE:To obtain good printing quality, by providing a shift register composed of three-stage constitution for storing new image data and the past image data and a logical operation circuit part for controlling a gate signal on the basis of the logical operation result of between past image data and each past image data to output the same to the driven circuit for a heat generating part to each heat generating part. CONSTITUTION:A main scanning shift register 55 and a history shift register, which is composed of three-stage constitution shown by QY1-QY128 for storing new image data for driving a heat generating part corresponding to the latch signal LATCH provided at every heat generating part and shifting the previous image data as the past image data to store the same, are mounted. Further, a drive circuit is provided at every heat generating part as a logical operation circuit to which a strobe signal, three kinds of gate signals and each image data of the history shift register are inputted and equipped with a logical operation circuit part 81 for controlling three kinds of the gate signals on the basis of the logical operation result between the past image data and these past image data to output either one of the gate signals or the combination signal thereof to the driver for the heat generating part as the drive condition of the heat generating part.</p> |
