Potentiometer providing a non-linear output

Details Potentiometer providing a non-linear output Potentiometer providing a non-linear output

1977-08-05

1978-11-14

Albritton, C. L.

Electrical resistors

Resistance value responsive to a condition

Magnetic field or compass

323 94H, 324251, H01L 4308

Patent

active

041258215

ABSTRACT:
A potentiometer which is generally similar to those potentiometers incorporating a pair of magnetic resistance effect elements and providing a linear output, but which produces a non-linear output by the choice of a particular configuration for the sensor surface of the elements and their relative arrangement. In accordance with the invention, a pair of magnetic resistance effect elements having sensor surfaces which are identical in configuration and size are mounted on the mount and are alternately exposed to the effective magnetic field as the latter rotates about the center of rotation during the rotation of the shaft. The sensor surfaces of the elements are disposed such that when a first and a second coordinate axis, orthogonal to each other, are drawn on the mount passing through the center of rotation, they are located on the opposite sides of the first coordinate axis and spaced from each other symmetrically with respect to the center of rotation. A scan begins with one end of the wiper edge of the effective magnetic field and ends with the other end thereof. During the scan, the area of the element exposed to the effective magnetic field varies non-linearly as the shaft rotates. The scan by the effective magnetic field takes place in a complementary manner for the pair of elements. As the area of the individual element exposed to the effective magnetic field varies, the resistance presented by the element varies in proportion thereto.

REFERENCES:
patent: 3331045 (1967-07-01), Weiss et al.
patent: 3745503 (1973-07-01), Kobayashi
patent: 3777273 (1973-12-01), Baba et al.

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