Linear positional displacement detector for detecting linear dis

Details Linear positional displacement detector for detecting linear dis Linear positional displacement detector for detecting linear dis

1994-12-15

1996-10-29

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

137554, 32420722, 32420724, G01B 714, G01D 514, G01R 3309, F16K 3700

Patent

active

055700152

ABSTRACT:
A linear positional displacement detector including a magnetic sensor unit (23) having a magnetic sensing surface formed by a ferromagnetic magnetoresistance element (23a) having a predetermined pattern, and an elongated permanent magnet (22) having a magnetic pole face (22a) at each end. The permanent magnet (22) is movable along its longitudinal axis and magnetically coupled with the magnetic sensor unit (23) with the longitudinal axis positioned on an extended surface of the magnetic sensing surface (23b). A positional displacement of the permanent magnet (22) along the longitudinal axis is detected as a change in the direction of a magnetic flux crossing in parallel the magnetic sensing surface (23b).

REFERENCES:
patent: 4107604 (1978-08-01), Bernier
patent: 4492922 (1985-01-01), Ohkubo
patent: 4646011 (1987-02-01), Wallrafen
patent: 4717873 (1988-01-01), Carr, Jr. et al.
patent: 5041785 (1991-08-01), Bogaerts et al.
patent: 5055781 (1991-10-01), Sakakibara et al.
patent: 5134371 (1992-07-01), Watanabe et al.
The Magnetoresistive Sensor, by August Petersen, Electronic Components & Applications, vol. 8, No. 4 1988, pp. 222-239.

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