| 摘要 |
PURPOSE:To reduce the difference between the temperature to be controlled and the target temperature by providing a mechanism part to secure the thermal connection between a temperature sensor which detect the temperature of a control subject and the open air. CONSTITUTION:A control subject 11 is fixed to a cooling plate 12 and a contact is secured between the plate 12 and one side of a Peltier element 13. While a radiating fin 14 has a contact with the other side of the element 13. The element 13 is energized to heat and cool the subject 11. The subject 11 is shielded from heat by a heat insulator 15. Then the temperature of the subject 11 is detected by a temperature sensor 16 through the plate 12. At the same time, a heat connection part 17 is provided to the insulator 15 to secure the thermal connection between the open air and the sensor 16. Thus the detected temperature signal is supplied to a comparator 19 together with the setting signal given from a setting circuit 18. Then a current is supplied to the element 13 via a drive circuit 20 with the signal which is proportional to the difference between said temperature signal and setting signal. As a result, the coincidence is obtained between the genuine subject temperature and the target temperature by controlling the degree of connection at the part 17.
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