Near field presence detection device

Details Near field presence detection device Near field presence detection device

G - Physics

01

V

G01V 3/08 (2006.01) G06K 13/067 (2006.01) G07F 19/00 (2006.01) G08B 13/187 (2006.01) G08B 21/00 (2006.01) H03K 17/94 (2006.01)

Patent

CA 2486601

The invention relates to a near field presence detection device provided to monitor an area (11) around a mouth (2) of a reading member, in particular a card reading member (1). The device comprises a presence detector (3) including a transmitter (4) and a receiver (5), said detector is provided to detect a change of field impedance due to a foreign object in the area (11). The device is further provided to generate a preliminary alarm signal and an effective alarm signal if preliminary alarm signal subsists within a predetermined time period.

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