ELECTROSTATIC CAPACITY DETECTION TYPE PROXIMITY SENSOR

摘要

There is provided an electrostatic capacity detection type proximity sensor capable of forming a proximity detection range in a spatially open region and detecting proximity with least malfunction by eliminating affect by a surrounding object other than an object to be detected. The proximity sensor includes a first detection electrode (11) and a second detection electrode (12) arranged at a predetermined distance h in the detection direction Y of the proximity of the object (20) to be detected and respectively independent from the grounding potential GND, and a proximity detection circuit (30) for outputting a difference between a grounding capacity Ca formed by the first detection electrode (11) and a grounding capacity Cb formed by the second detection electrode (12) as a proximity detection output.