Coil assembly for electronic article surveillance system
US5440296A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 1993 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Apr 29, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q7/04
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An antenna lattice for use in a magnetically based electronic article surveillance system. The lattice includes a field-producing coil assembly which includes a pair of trapezoidal-shaped segments, each having a diagonally extending lower portion, the segments being juxtaposed in a mirror image so that the diagonal portions are opposite each other. The segments are connected so that vertical components of the currents in the diagonal sections at least partially cancel. Preferably, top horizontal sections of each segment are located at different levels, thereby extending the upper coverage, and a detector coil preferably also juxtaposed extends above the top horizontal section of the field-producing coil to further extend the range of detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.