Shoplifting detection system with partly screened antennas
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United States of America Patent
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-
Nov 22, 1994
Grant Date -
N/A
app pub date -
Nov 30, 1992
filing date -
May 1, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electromagnetic shoplifting detection system of the type operating with a high-frequency detection field, including at least one antenna coil (6, 7) mounted adjacent to or on a checkout unit (K1, K2) for generating an electromagnetic alternating field by which detection labels having a resonant circuit can be detected, the checkout unit containing electrically conducting elements (11) in which elements in operation parasitic currents are produced due to the alternating field, and which conducting elements form a parasitic signal path, and devices (20, 30) arranged between the at least one antenna and the checkout unit for providing an electromagnetic shield between the at least one antenna coil and checkout unit.
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