Position detecting device employing a magnet and back yoke relat

Details Position detecting device employing a magnet and back yoke relat Position detecting device employing a magnet and back yoke relat

1992-07-16

1994-11-29

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

307116, 32420724, G01B 714, H01H 3600

Patent

active

053693612

ABSTRACT:
Disclosed is a position detecting device of magnetic detection type capable of accurate position detection. The device comprises a magnet consisting of an N-pole part and an S-pole part, a back yoke formed with upstanding projections extending up to the surface level of the N-pole part of the magnet, the S-pole part of the magnet being bonded to the central area of the back yoke, and a Hall IC located to make parallel movement relative to both the exposed upper surface of the N-pole part of the magnet and the upper end surfaces of the projections of the back yoke in slightly spaced apart relation. When the Hall IC moves above narrow spaces, which are defined between the magnet and the projections of the back yoke and in each of which the magnetic flux density is zero (the neutral zone between the N pole and the S pole), the threshold of the Hall IC is crossed by the magnetic flux density curve in each of these narrow spaces, so that the position can be detected without any substantial error.

REFERENCES:
patent: 3473109 (1969-10-01), Maaz et al.
patent: 3750068 (1973-07-01), Hallin
patent: 4061988 (1977-12-01), Lewandowski
patent: 4124814 (1978-11-01), Lauerman
patent: 4737710 (1988-04-01), Van Antwerp et al.

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