| 摘要 |
<p>PURPOSE:To make it unnecessary to read correction data at each time when printing data is read and to increase printing speed in an LED printing head driving circuit having quantity-of-light correction function correcting the irregularity of the quantities of light of a plurality of LEDs. CONSTITUTION:A second latch circuit 25 storing correction data, a first latch circuit 20 storing printing data and a second AND circuit part 80 performing the AND output of the second latch circuit 25 are provided to a shift register 10 and first and second switch parts 70, 75 are alternately changed over by a control signal (CTL) to perform printing. The correction data is stored in the second latch circuit 25 during the warm-up period in printing operation.</p> |
