| 摘要 |
<p>PURPOSE:To reduce the error of current temperature display by providing the titled device with a current temperature detecting means detecting a temperature different from set temperatures. CONSTITUTION:Resistors 3-6 and transistors (TR) 7-10 select N stages of set temperatures, and when a temperature measured by a thermistor 1 is lower than said set temperatures, a heater 27 is driven through a heater driving means 26. The current temperature is displayed by diodes 19-22. In this case, the base of a TR43 is connected to an output port 15l of a microcomputer 15 and a series body consisting of said TR43 and a resistor 42 is connected to a resistor 18 for obtaining the reference voltage of a comparator 16 in parallel to form a current temperature detecting means for displaying the temperature. Since a resistor 42 is also connected, the positive input reference potential of the comparator 16 is reduced at the detection of the temperature, the temperature different from the set temperatures is detected an the absolute value of the error of the displayed temperature is reduced.</p> |
