| 摘要 |
<p>A control system for thermal print head (40) which is movable across a printing line, and includes a plurality of banks (40A-40E) of thermal printing elements (32), includes means for regulating the firing of the print elements (32) with the proper pulse width to compensate for resistance variation between the banks (40A-40E) and for increasing substrate temperature. The control circuit includes a driving circuit for turning the print elements (32) on and off, and a decision-making circuit which executes the substrate temperature coding and control codes and sends control signals to the driving circuit. Three types of temperature compensation are utilized in the control program. A tailored pulse width is used for each bank (40A-40E) of the print elements to compensate for various element resistances. As the print head shuttles across the record medium, the pulse width is reduced for each horizontal dot position. The pulse width also is reduced for each line printed in the format.</p> |
