Magnetic interrogation techniques
US6369965B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 1999 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Jul 20, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10316
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A reader for interrogating a magnetic tag, e.g. for reading data stored in the tag, is described. The reader comprises a field generating device the magnetic field produced by which defines an interrogation zone, wherein said field generating device comprises: (a) means for generating a magnetic field: (b) a transmit coil for transmitting an interrogating electromagnetic signal into the interrogation zone so as to interact with a magnetic tag, when present in said interrogation zone; and (c) at least one receive coil for receiving an electromagnetic signal generated by a tag in response to said interrogating signal and the magnetic field produced by said magnetic field generating means. The field generating means can take the form of a pair of hollow cylinders, giving rise to a “loop” reader, or it can be a flat magnet, giving rise to a “side pass” reader.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.