Shielded magnetic reading devices
US6595419B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 2001 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Sep 5, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/084
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A detector for reading information stored in a magnetic tag is disclosed, the reader comprising two assemblies of permanent magnets (each containing three magnets) arranged with their magnetic poles in opposition such that the magnetic poles of one triplet are physically opposite the like poles of the other triplet. The magnets are preferably elongate with their long axes being mutually parallel. The two magnet assemblies define between them a gap through which, in use, a tag having magnetic material is passed. Receiver coils are positioned within the gap. The magnet assemblies are preferably rigidly secured within an aluminum housing. Electrostatic screening foils may be placed over the receiver coils.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.