| 摘要 |
A detecting apparatus utilizing light comprising a light beam emitter for emitting beams of light having a predetermined light path toward a plurality of retroreflectors adapted to reflect light in a direction from which the light strikes thereupon, and a receiver to receive the beams of light reflected by the retroreflectors, the light beam emitter including a light source and a mirror for detecting the beams of light received from the light source toward the retroreflectors, characterized in that the apparatus further comprises a drive to rotate the mirror about an axis normal to an optical axis of the beams of light extending from the light source to the mirror and also normal to directions in which the beams of light proceed from the mirror to the retroreflectors, and that slits are defined at outlets from which the beams of light proceed toward the retroreflectors, the slits having a shape to permit the beams of light to diffuse vertically.
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