Thermal head for thermal recording machine

A thermal head for a thermal recording machine comprising:

• an insulating substrate which is composed of a printed circuit board made of a heat resistant resin and covered with a copper film on a rear surface thereof wherein the copper film is a heat releasing metal layer;
• a plurality of thermal resistors disposed on a front surface of said insulating substrate in a direction corresponding to scanning;
• a plurality of discrete electrodes electrically connecting first ends of said plurality of thermal resistors to a control element;
• a common electrode electrically connecting second ends of said plurality of thermal resistors together;
• a heat releasing layer formed of copper film on the front surface of said insulating substrate beneath each of said plurality of thermal resistors;
• and
• a thermal accumulating layer of a polyimide resin covering said heat releasing layer.