| 摘要 |
<p>PURPOSE:To improve assembling property and to make it possible to change a detecting area readily by forming an engaging part for engagement to the engaging holes at both side-edge parts of a translucent cover which is inserted from the outside of an opening window. CONSTITUTION:A plurality of engaging holes 34 which are engaged with protruding engaging parts 9 of a device 2 are formed at both side-edge parts of a translucent cover 33. The translucent cover 33 is inserted through the front side of an opening window 5, and the engaging holes 34 can be engaged with the engaging parts 9. Adjusting slide switches 55 are provided at operating holes 14 and 14 of the device 2. The adjustment of the slide switches 55 is not required at the normal time. The adjusting slide switches 55 and operating parts 59 and 60 for an adjusting variable resistors 56 are covered with a display plate 35. The translucent cover 33 is inserted through the front side of the opening window 5 of the device 2 at the final stage of assembling steps, and the engaging holes 34 are engaged with the engaging parts 9. When the rotating operation is performed with an operating knob 28, a rotary frame 20 is turned by a shaft part 25 as the center. The rotary frame 20 and an infrared-ray sensor 51 are turned, and a detecting area can be readily adjusted and changed.</p> |
