Linear magnetic sensing device

Details Linear magnetic sensing device Linear magnetic sensing device

1991-11-12

1993-11-30

Lateef, Marvin M.

Electrical resistors

Resistance value responsive to a condition

Magnetic field or compass

335302, H01L 4306

Patent

active

052669173

ABSTRACT:
A magnet device having a predetermined field profile has an elongated permanent magnet, having a longitudinal axis and a peripheral surface, magnetized diametrically with the direction of magnetization extending transversely to the longitudinal axis and rotating about at least a portion of the length of the longitudinal axis of the magnet. The rate of rotation is selected to provide a predetermined magnetic field profile as presented to a Hall effect device positioned a fixed distance from the peripheral surface of the magnet when relative movement between the Hall effect device and the permanent magnet occurs. The magnet is formed of a composite material which includes a magnetically isotropic permanent magnet powder adhered together by an adhesive non-magnetic binder.

REFERENCES:
patent: 3911429 (1975-10-01), Vinal
patent: 4107604 (1978-08-01), Bernier
patent: 4134539 (1979-01-01), Hopkinson
patent: 4668914 (1987-05-01), Kersten et al.
patent: 4767474 (1988-08-01), Fujimura et al.
patent: 4804684 (1989-06-01), Fujimura et al.
patent: 4983231 (1991-01-01), Yamanaka et al.
patent: 5006806 (1991-04-01), Rippingale et al.
patent: 5017873 (1991-05-01), Rippingale et al.
patent: 5100604 (1992-03-01), Yamashita et al.

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