Method and apparatus for the contact-free identification of articles having a protective enclosure, wherein the articles are identified using multiple electromagnetic wave transmission/reception devices
US5583330A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1995 |
| Grant date | Dec 10, 1996 |
| Priority date | — |
| Expiry date | Jan 11, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10336
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The system has a reader of electronic labels comprising several devices for the transmission/reception of electromagnetic waves, offset angularly about a median axis so that, when the reader is placed in the vicinity of a label and irrespectively of their relative orientation, at least a part of the lines of the magnetic field generated by at least one of said transmission/reception devices can get looped by passing into the coil of the label in the direction of its axis. The label has a foil made of amagnetic and conductive material placed against the antenna and parallel to it to form a reflective screen for the electromagnetic waves. Application to the contact-free identification of objects, notably metal objects, such as gas cylinders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.