| 摘要 |
<p>PURPOSE:To keep a peak temperature of each heating element constant to perform an electric conduction to each heating element with a proper conduction energy by a method wherein heating elements are divided into blocks, the total number of conduction dots is counted per block, and in accordance with the total number of conduction dots an electric conduction energy is incrementally/ decrementally corrected. CONSTITUTION:Heating elements 6 and conduction time controllers 9 are divided into blocks 10. A dot counter 11 for counting the number of conduction dots of each heating element 6 in each block 10 based on ON/OFF conduction data transmitted from an MPU 8 is connected between each conduction time controller 9 per block and the MPU 8. A correction arithmetic device 12 is also connected to the dot counter 11; the correction arithmetic device 12 inputs the number of counted dots from the dot counter 11, operates the total number of conduction dots, on the basis of the result operates incremental/decremental correction data for a conduction time of a drive voltage to each heating element 6, and outputs the result to each conduction time controller 9 in the same block 10. In this manner, an electric conduction to each heating element can be accurately controlled in accordance with the conduction state of the heating element.</p> |
