| 摘要 |
<p>A historical control circuit in a thermal printer controls the drive current fed to a resistive heating element (2) according to the printing of previous dots by that resistive heating element (2). The circuit remembers whether or not the heating element printed a certain number of preceding dots and, for each printed dot among those dots, masks an interval in the drive signal. This is done in such a way that if two patterns of previous dots contain unequal numbers of printed dots but generate equal residual temperatures, the drive signal for the pattern with more printed dots is divided into more separate pulses. Adjustments can be made by masking or unmasking a specific interval for a specific pattern. Cutoff of the drive signal may be delayed for patterns in which a certain number of most recent dots were all unprinted. <IMAGE></p> |
