PURPOSE: To obtain favorable heat response characteristics and enable to print images with high quality, by a method wherein a heat conduction controlling layer the heat conductivity of which is reduced at the time of passing an electric current to a heating resistor and is increased at other times is provided between a substrate and the heating resistor.
CONSTITUTION: A thermal head comprises heating resistors 14 and a driving circuit for selectively heating the elements in accordance with image information. The heating element 14 is provided on an insulating ceramic substrate 11 through a semi-conductor layer 12 consisting of a P type indium-arsenic layer and an electrical insulating layer 13 consisting of silicon oxide. The heat conductivity KP of P type indium-arsenic constituting the layer 12 is decreased as the supplied current I is increased. Accordingly, the thermal efficiency at the time of passing the electric current becomes favorable, heat-radiating characteristics after completion of the passing of the electric current (at non-current-passing time) become favorable, and high-quality images can be printed.
| JPS5874301 | 【考案の名称】チツプ状抵抗器 |
MORIGUCHI HARUHIKO
INUI TOSHIJI
