Magnetic sensor having a high resolution track with magnets of varying dimensions and a low resolution track
US8816677B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 20, 2011 |
| Grant date | Aug 26, 2014 |
| Priority date | — |
| Expiry date | May 19, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/145
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensing apparatus includes first and second magnet assemblies. The first magnet assembly includes first and second magnets that have respective first and second opposite magnetic fields. The first magnet has a plurality of dimensions including an inner circumferential dimension, an outer circumferential dimension, an inner axial dimension, an outer axial dimension, and a radial dimension, and the second magnet has a corresponding plurality of dimensions. The inner circumferential dimension or outer circumferential dimension of the first magnet is relatively smaller than the corresponding dimension of the second magnet. A second magnet assembly is positioned at a distance from the first magnet assembly and includes a third magnet having a third magnetic field opposite to the first magnetic field. The first magnet assembly is a high-resolution track, and the second magnet assembly is a low-resolution track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.