Magnetic field energy responsive position sensing apparatus and

Details Magnetic field energy responsive position sensing apparatus and Magnetic field energy responsive position sensing apparatus and

1993-12-10

1998-08-04

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

32420726, 324235, G01B 714, G01N 2772, G01R 3300

Patent

active

057899150

ABSTRACT:
The invention concerns magnetic field energy responsive position sensing apparatus and method. A Hall sensor has an element defining a generally planar active face and circuitry coupled to said Hall sensor for producing a two state electrical output signal in response to magnetic field energy in a region of said active face. A ring magnet has spaced apart annular end walls that are adjacent a north pole and south pole of the ring magnet and defines a magnetic field in a center region of the ring magnet. The ring magnet and the Hall sensor are mounted for relative linear movement in a direction substantially normal to the active face of the Hall sensor so that the active face moves through the center region of the ring magnet. One annular end wall of the ring magnet moves past the active face while avoiding mechanical contact with the active face. This causes the electrical output signal to change state as the end wall moves past the active face of the Hall sensor element. A latch circuitry is coupled to the Hall sensor for maintaining a signal output from said sensor subsequent to initiation of the output signal.

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