Thermal head control system

Abstract

Abstract PURPOSE:To control a thermal head by correcting temperature in stable and high accuracy by a method wherein microelectric power is supplied to a exothermic body element for the recording use to maintain a thermal head in a certain temperature or less and a separate heater for heating a bias is not required. CONSTITUTION:The temperature at the peripheral area of an exothermic body is detected by a heat sensitive element 201 and the reference value voltage of the point B and the potential of the point B are applied to a comparator 204 to operate a transistor 205. An oscillating element 206 starts to oscillate, when the electric potential applied to the input terminal thereof approaches zero, to generate pulses, and stops the oscillation when the electric potential at the point D becomes high. The pulse output from the oscillating element 206 is set to be a pulse having a so short a current flowing time as printing is not performed with the pulse, and further, the print signal applied to a thermal head is made sufficiently long, thereby giving the heat energy in which a heat sensitive recording material can be sufficiently changed chemically.

Inventors

• 👤 Katsuhiko Toda
• 👤 Susumu Sugiura
• 👤 Joji Amitani
• 👤 Seiko Tanmachi

Bibliographic Details