# US 4,395,695 A · Non-contact magnetic potentiometer

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- Number: US 4,395,695 A
- Document ID: US4395695A
- Status: Granted
- Kind: A
- Application number: 06/285,330
- Filed: 1981-07-22
- Granted: 1983-07-26
- Earliest claimed: 1980-07-25
- Assignees: Copal Company Limited
- Inventors: Shigekazu Nakamura
- Web page: https://patentgrep.com/patent/US4395695A

## CPC

- H01C 10/103: {by using means responding to magnetic or electric fields, e.g. by addition of magnetisable or piezoelectric particles to the resistive material, or by an electromagnetic actuator}
- H10N 52/00: Hall-effect devices (integrated devices or assemblies of multiple devices H10N59/00)
- H01C: RESISTORS
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR

## Abstract

A non-contact magnetic potentiometer comprising a rotatably supported first yoke, a second yoke arranged as opposed to the first yoke at a slight spacing, a pair of permanent magnets fixed as inclined on the surface of the first yoke opposed to the second yoke and magnetized in the thickness direction, and a hall effect device fixed on the second yoke as opposed to the pair of permanent magnets, whereby the structure and manufacture can be simplified and an output voltage of any desired wave form can be obtained. This potentiometer is provided with a means for preventing the influences of the temperature and the variation with the lapse of years.

## Claims

### Claim 1

A non-contact magnetic potentiometer comprising a rotatable first yoke to which an angular displacement is to be transmitted, a second yoke arranged as opposed to and spaced from said first yoke, a hall effect device fixedly located in parallel with said second yoke between said first yoke and second yoke, and a pair of permanent magnets magnetized in the thickness direction and secured to said first yoke as inclined to said hall effect device, a hall electromotive force being put out of said hall effect device in response to the angle of rotation of said first yoke when said first yoke is rotated.

### Claim 2 (depends on 1)

A potentiometer according to claim 1 wherein said pair of permanent magnets ae arranged symmetrically with each other with respect to the axis of rotation of said first yoke and the sides facing said hall effect device of said pair of permanent magnets having polarities reverse to each other.

### Claim 3 (depends on 1)

A potentiometer according to claim 1 wherein said pair of permanent magnets are arranged as inclined in the same direction with each other to the plane intersecting at right angles with the axis of rotation of said first yoke and the sides facing said hall effect device of said pair of permanent magnets have polarities reverse to each other.

### Claim 4 (depends on 2, 3)

A potentiometer according to claim 2 or 3 wherein said hall effect device is secured on said second yoke.

### Claim 5 (depends on 2, 3)

A potentiometer according to claim 2 or 3 wherein said first yoke and second yoke are integrally connected with each other through connecting members made of a nonmagnetic material.