| 摘要 |
<p>PURPOSE:To provide an object detecting device that can surely prevent error in detection that could be caused by the shift of a subject for detection and a difference in diffuse reflectance. CONSTITUTION:An object detecting device includes a subject 6 for detection that moves on a mirror reflecting plate 5, a projector 4 which causes a ray of light to impinge on the mirror reflecting plate 5 at a predetermined incident angle, and a receiver 7 which receives the reflected light from the mirror reflecting plate 5 at the same angle as the predetermined incident angle. The projector 4 and the receiver 7 are displaced so that a plane formed by the respective optical axes of the projector 4 and the receiver 7 is made to orthogonally intersect the direction of movement of the subject 6 for detection, and a long, narrow aperture 8A for regulating the amount by which the reflected light is received by the receiver 7 is bored near the receiver 7 and perpendicular to the direction of movement of the subject 6 for detection.</p> |
