| 摘要 |
PURPOSE:To adjust the scope of detection by installing a No. 1 reflector reflecting beams from a light-emitting diode to a distribution lens and a No.2 reflector reflecting condensed beame to a light-receiving element respectively to a light-emitting unit and to a light-receiving unit, and by making angles of both of the reflectors adjustable. CONSTITUTION:A reflected beam-detecting switch is fixed to a rectangular stand 11 whereon a light-emitting unit 30 and a light-receiving unit 40 are installed side by side. To each of the units 30 and 40, main base boards 31 and 41 are installed; each of them is respectively equipped on its front with two light-emitting diodes 33 and two light-receiving elements 43, and three element distribution lenses 32 and three beam-condensing lenses 42 are respectively provided on their bottoms. Rotary shafts 34 and 44 equipped with an angle- adjusting device that swings being interlocked with a handle 12 are installed on supporting points in the main bodies of the light-emitting unit 30 and the light-receiving unit 40, and reflectors 35 and 45 are installed respectively to the shafts 34 and 44. Then the handle 12 is made to swing with the reflected beam-detecting switch itself being tilted by angle adjustment made to the reflectors 35 and 45. Thereby the scope of detection can be adjusted. |
