| 摘要 |
PROBLEM TO BE SOLVED: To stably and accurately switch light-introduction and light-shielding, to enhance temperature detection accuracy and to reduce a noise generated at the time of switching the light-introduction and the light shielding in a temperature detection device for detecting the temperature of an object to be detected by a non-contact, particularly in a shielding plate for controlling the light- introduction and the light-shielding of an infrared. SOLUTION: In the temperature detection device, the rotation direction of a DC motor 2 is alternately reversed and a light-shielding plate 1 driven by the DC motor 2 is collided to a stopper 13 to switch light-introduction and light-shielding of an infrared passage arriving at the infrared detector 3. After a power is fed to the DC motor 2 by an initial power feeding means to drive the light-shielding plate, the power is reduced and fed by a reduction power feeding means and the light-shielding plate 1 is collided to the stopper 13 and is stopped. Therefore, the light-introduction and light-shielding states of the infrared are stably and calmly switched and temperature detection accuracy can be enhanced.
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