Position detecting apparatus using magneto-resistance effect ele

Details Position detecting apparatus using magneto-resistance effect ele Position detecting apparatus using magneto-resistance effect ele

1994-07-26

1995-07-04

Look, Edward K.

Electricity: measuring and testing

Magnetic

Displacement

32420724, 359698, 359824, G01B 700, G01P 342

Patent

active

054303753

ABSTRACT:
A position detecting apparatus comprising a magnet secured to a movable body (lens holder) which is movable along a shaft body when the shaft body is inserted, the magnet having polarity which is alternately magnetized at a predetermined interval, and a magneto-resistance effect element which is positioned and fixed so as to be confronted to the magnet at a predetermined gap interval by an MR holder with the shaft body being used as a securing position reference, and the magneto-resistance effect element serving to obtain a position detection signal for the movable body through variation of a resistance value thereof which is caused by magnetic field of the magnet through movement of the movable body.

REFERENCES:
patent: 4429276 (1984-01-01), Narimatsu et al.
patent: 4740064 (1988-04-01), Kono et al.
patent: 4818939 (1989-04-01), Takahashi et al.
patent: 4904937 (1990-02-01), Takahashi et al.
patent: 5055781 (1991-10-01), Sakakibara et al.
patent: 5200776 (1993-04-01), Sakamoto

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