Magnetoresistance sensing device without hystersis influence
US5801529A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1996 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Oct 31, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/147
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention provides a sensing device capable of outputting a correct signal precisely corresponding to a particular position (angle) of, for example a protruding or recessed portion of a rotating member made of a magnetic material. The sensing device includes: a magnet for generating magnetic field; a rotary member of magnetic material for changing a magnetic field generated by the magnet, the rotary member of magnetic material being disposed a predetermined distance apart from the magnet; and a giant magnetoresistance device for detecting the varying magnetic field, the operating range of the giant magnetoresistance device being set such that the change in resistance of the giant magnetoresistance device is uniform over the entire operating range in both directions of change in the magnetic field induced by the rotary member of magnetic material, wherein the giant magnetoresistance device is disposed in such a manner that the center of the magnetic field sensing plane of the giant magnetoresistance device deviates from the center of the magnet in a direction parallel to a plane containing the displacement direction of the rotary member of magnetic material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.