| 摘要 |
<p>PURPOSE:To enable density recorded on a thermal recording paper to be kept constant by automatic control of heating a hot pen, by having nonlinear characteristics within a control circuit. CONSTITUTION:The duty cycle for determining electric power P to be given a hot pen 2 is controlled with an output of an operational amplifier 1. When a relative velocity V between the hot pen and a recording paper is large, resistance Rp(T) of the hot pen 2 to be inputted to a nonlinear demodulation circuit 21 is controlled large, that is, temperature T is controlled large. Optimum recording density can be kept thereby.</p> |
