Proximity sensor having a non-ferrous metal shield for enhanced

Details Proximity sensor having a non-ferrous metal shield for enhanced Proximity sensor having a non-ferrous metal shield for enhanced

1997-01-23

1998-09-01

Patidar, Jay M.

Electricity: measuring and testing

Magnetic

Displacement

32420716, 324236, 336 84R, 174 36, G01B 714

Patent

active

058015302

ABSTRACT:
A proximity sensor includes a transducer and a circuit having a switch that changes state in response to a presence of an object in spaced relation to the transducer. The transducer includes a magnetic form defining a generally planar surface facing a sensing zone of the sensor. The magnetic form includes a side surface that extends away from the sensing zone and an internal cavity that opens outwardly toward the sensing zone. A sensing coil is positioned within the magnetic form cavity. The transducer additionally includes a sensor housing supporting the sensing coil and the magnetic form in relation to the sensing zone. A non-ferrous metal shield is positioned inside the sensor housing to surround at least a portion of the magnetic form and enhance a sensing range of the proximity sensor. The shield has an edge that faces the sensing zone located substantially co-incident with the generally planar surface of the magnetic form.

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