| 摘要 |
The invention provides a thermal head apparatus of the type which includes, as a heat generation element, a resistor member whose resistance value varies depending upon the temperature thereof, wherein the accuracy in detection of the temperature of a medium is improved to assure an improved quality of printing. The thermal head apparatus includes a plurality of heat generating resistance elements and having an electric resistance whose value varies depending upon a temperature thereof, a heat generation driving and temperature detection circuit for first driving the resistance elements in accordance with print data to generate heat and then successively detecting voltages across the resistance elements to detect temperatures of them, a control circuit for comparing the thus detected temperatures with the print data and controlling the heat generation driving function of the heat generation driving and temperature detection circuit based on results of the comparison, and a switch for switching the heat generation driving and temperature detection circuit between a heat generation driving condition and a temperature detection condition.
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