| 摘要 |
PROBLEM TO BE SOLVED: To provide an antifouling structure or the like for preventing adhesion of fouling onto a translucent window part by closing the translucent window part when detection is not performed. SOLUTION: A protection case unit 40 has a box shape capable of storing a sensor head 20 inside as a whole, and the back face thereof is opened, and the sensor head 20 can be stored inside therefrom. A light insertion window D is provided on the front face of the protection case unit 40, and an opening/closing door 50 is also provided. The opening/closing door 50 is opened/closed by a driving force of an air cylinder 60, to thereby close/open the front face 46A of the light insertion window D. Consequently, when detection is not performed, the opening/closing door 50 is put into the closed state, to thereby avoid adhesion of a foreign matter onto the light insertion window D. COPYRIGHT: (C)2007,JPO&INPIT
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