| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-optical-axis photoelectric sensor capable of detecting at a high S/N ratio and reducing cost by cutting down the number of elements. SOLUTION: In this multi-optical-axis photoelectric sensor, light projected to a reflector 20 from a plurality of light projecting elements 11 provided at a sensor body 10 enters one end of each reflector constituent body 21 arranged with level difference. The light is offset by a prescribed quantity, returned to the sensor body 10 side from the other end of the reflector constituent body 21 and received by one light receiving element 12. When the light is shielded by a detection object, the light receiving quantity of the light receiving element 12 is reduced, and the detection object is thereby detected. Sine the light emitted from the light projecting element thus makes only one round trip between the sensor body 10 and the reflector 20, the number of round trips is small, and the decay of light is little compared with a conventional one. Cost can be reduced by cutting down the number of elements. |
