REFLECTION TYPE PHOTOELECTRIC SENSOR

摘要

PROBLEM TO BE SOLVED: To reduce the dead band range of a reflection type photoelectric sensor by raising the detection resolution of the sensor with respect to an object to be detected in the far field without using another reflection type photoelectric sensor in combination.

SOLUTION: A light emitting element 5 for near distance which emits light forward is additionally installed to the reflection type photoelectric sensor composed of a light emitting lens 1, a light emitting element 2 for far distance which emits light forward through the lens 1, a light receiving lens 3, and a light receiving element 4 which receives light incoming from the front side through the lens 3. The light emitting element 5 is arranged between the set of the light emitting lens and element 1 and 2 and the set of the light receiving lens and element 3 and 4 by means of a sensor body 6 so that the light emitted from the element 5 may be reflected to the light receiving range of the light receiving element 4 by the object to be detected in a near field RSD within a prescribed distance D.

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