| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a security sensor which is simple and inexpensive, is difficult to have a lens removed from the outside and has an improved holding structure for a lens that prevents the malfunction of a sensor. SOLUTION: A lens 6 is easily inserted into a cover 3, since an engaging part 24 and engaged part 25 are engaged and a fixture piece 6a is inserted into the inside of the cover 3 and fixed by the inner deflection of the piece 6a of the lens 6. The lens 6 is difficult to be removed from the outside, because the inner displacement of the piece 6a of the lens 6 is prevented by a stopper 26 on a seating D, that is attached to a base 2 after the cover 3 into which the lens 6 is inserted is attached to the base 2. Also, because seal parts S1 and S2 seal gaps between the surface and rear faces 3a and 3b of the cover 3, insects do not pass the face 3a of an infrared sensor 4, and therefore, the malfunction that is caused by the insect is prevented.</p> |
