| 摘要 |
PURPOSE:To control an impressed voltage and enable to reduce irregularity in printed density, by a method wherein a printing voltage signal is detected, a condition of continuity of a printing voltage is converted into an analog voltage by an integrating circuit, and the analog voltage is fed back to a voltage-setting circuit. CONSTITUTION:A command signal from a personal computer or the like is inputted through a terminal 1, and the printing voltage signal is transmitted from a printer-controlling circuit 2 consisting of a microcomputer or the like to a heat-sensitive head 4 through a head-driving circuit 3. Since the printing signal exists only during printing, the condition of continuity of printing is detected by a detecting circuit 5, the detection result is converted into an analog voltage by integrating by the integrating circuit 6 consisting of CR circuit, the analog voltage is fed back to a voltage-stabilizing circuit in a head power source circuit to control a head power source voltage, thereby contriving to stabilize printed density. Accordingly, print quality can be enhanced by a simple circuit. |
