| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a position detection-type passage sensor that is inexpensive and can be installed easily by setting a plurality of sensors at a specific interval and overlapping the projection beams of both the sensors for composing a detection area. SOLUTION: Two sensor units are set at a specific interval, and the projection beams of both the sensor units are overlapped to composed a detection area. Light where the projection beam is diffused and reflected by a passing object is received, and a passing point is obtained from an angle and the distance between the sensors. In this case, the emitted projection beams are bent by mirrors 2 and 3, are subjected to fan-shaped scanning by the mirror of a light beam scanner 4, and are emitted to the outside of the sensor units. When the projection beams hit against the passing object, they are diffused and reflected and partially return to the mirror of the light beam scanner 4. A part of light that is reflected after hitting against the passing object passes through the mirror of the light beam scanner 4 and a light reception lens 5 and reaches a photo-detector 6, and is converted into an electrical signal.</p> |
