Access control system for controlling the access to at least one

Details Access control system for controlling the access to at least one Access control system for controlling the access to at least one

1998-01-20

2000-11-14

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

34082534, 34082554, 34082569, 342 42, 342 44, G07D 700, H04Q 522, G01S 1374

Patent

active

061476218

ABSTRACT:
In an access control system (8)--which comprises a transponder communication device (9) and at least two transmission coils (11, 12) connected to the transponder communication device (9), for receiving transponder signals, of which a first transmission coil (11) is associated with a first door (2), and which comprises a first activation device (18 associated with the first transmission coil (11) and the first door (12), and which comprises a first door opener (23) for the first door (2) and a logic device (45) for activating the first door opener (23)--the two transmission coils (11, 12) have arbitrarily large receiving ranges and the first transmission coil (11) and at least one further transmission coil (12) are followed by amplitude detector (34, 36) by which the amplitudes of the transponder signals supplied by the two transmission coils (11, 12) can be detected and the logic device is arranged after the amplitude detector (34, 36) and adapted to detect a condition in which the amplitude of the transponder signal supplied by the first transmission coil (11) is greater than the amplitude supplied by the second transmission coil (12), which first door opener (23) for the first door (2) can be activated the logic device (45) only upon detection of this condition.

REFERENCES:
patent: 4672375 (1987-06-01), Mochida et al.
patent: 4700186 (1987-10-01), Fujino et al.
patent: 4760394 (1988-07-01), Takeuchi et al.
patent: 4881148 (1989-11-01), Lambropoulos et al.
patent: 5157389 (1992-10-01), Kurozu et al.
patent: 5499022 (1996-03-01), Boschini
"Keyless Entry System with Radio Card Transponder", IEEE Transaction on Industrial Electronics, vol. 34, No. 2, May 1988, pp. 208-216.

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