Tunable magnetic device for use in a proximity sensor
US6703830B2 · kind B2 · utility
8Cited by
10References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 18, 2002 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Feb 18, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/94015
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A tunable magnetic device which includes a permanent magnet in the shape of a ring, an inner aperture, a tuning member, and a field sensor secured to the permanent magnet. The tuning member may be a ferrous or magnetic material and may be secured to a non-magnetic tuning device. The inner aperture is preferably small compared to the permanent magnet. The magnetic device provides a magnetic field that is sensitive to the proximity of a ferrous object and provides a tunable mechanism to locally balance the magnetic field where the field sensor is located.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.