Position sensor with a shield member for improving linearity...

Details Position sensor with a shield member for improving linearity... Position sensor with a shield member for improving linearity...

2006-05-12

2009-10-06

Patidar, Jay M (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S207240

Reexamination Certificate

active

07598734

ABSTRACT:
A position sensor with excellent linearity of coil impedance is provided. This position sensor is equipped with a tubular detection coil, a magnetic core movable in the detection coil, a drive circuit for the detection coil, a signal processing circuit for converting a change in impedance of the detection coil into an electric signal, and a shield member disposed around the detection coil. The shield member is a tubular member having a first inner surface for surrounding an axial region of the detection coil, and a second inner surface for surrounding another axial region of the detection coil. The tubular member is formed such that a distance between the second inner surface and the detection coil is smaller than the distance between the first inner surface and the detection coil.

REFERENCES:
patent: 4627280 (1986-12-01), Hayashi et al.
patent: 4667158 (1987-05-01), Redlich
patent: 4912409 (1990-03-01), Redlich et al.
patent: 6909279 (2005-06-01), Niwa
patent: 2006/0164075 (2006-07-01), Niwa
patent: 63-265115 (1988-11-01), None
patent: 64-6515 (1989-01-01), None
patent: 2001-21306 (2001-01-01), None
patent: 2004/099727 (2004-11-01), None
English language Abstract of JP 2001-21306.
English language Abstract of JP 63-265115.

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