| 摘要 |
A photoelectric switch which has a light source made up of elements 1a, 1b, and 1c for emitting light, a projection lens 3, a first optical fiber 6a for guiding the light emitted from the light source and penetrating the projection lens into a detection position 7, a detection light reception element 2a, a second optical fiber 6b for guiding the light reflected from the detection position 7 or the light penetrating the detection position 7 into the detection light reception element 2a, and a monitor light reception element 2b disposed at a position for receiving light between the projection lens 3 and the incident end part of the first optical fiber 6a. According to the present invention, it is possible to provide a photoelectric switch capable of precisely monitoring the light transmission quantity if the transmissivity or reflectivity of an optical system changes.
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