Near field presence detection device

Details Near field presence detection device Near field presence detection device

2006-12-19

2006-12-19

Hofsass, Jeffery (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S005410, C340S005660, C902S001000, C902S004000, C902S005000, C902S031000

Reexamination Certificate

active

07151451

ABSTRACT:
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.

REFERENCES:
patent: 5523739 (1996-06-01), Manneschi
patent: 6390367 (2002-05-01), Doig
patent: 6422475 (2002-07-01), May
patent: 1 043 704 (2000-10-01), None

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