Magnetoresistance sensing device with increased magnetic field detection efficiency
US5789919A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Oct 31, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention provides a sensing device capable of outputting a high-accuracy signal precisely corresponding to a particular position (angle) of a rotating member made of a magnetic material without being disturbed by external noise. The sensing device includes: a magnet for generating a magnetic field; a rotating member made of a magnetic material, for changing the magnetic field generated by the magnet, the rotating member being disposed a predetermined distance apart from the magnet; and a giant magnetoresistance device whose resistance changes in response to the change in the magnetic field caused by the rotating member of magnetic material, wherein the size L.sub.3 of the magnetic field sensing plane of the giant magnetoresistance device is set to a value less than the smallest value of the dimensions L.sub.1 and L.sub.2 of the protruding and recessed portions of the rotating member of magnetic material, that is, the size L.sub.3 of the magnetic field sensing plane is set so that the following conditions are satisfied: L.sub.3 .ltoreq.L.sub.1 and L.sub.3 .ltoreq.L.sub.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.