Inductor/antenna for a recognition system
First Claim
1. An improved inductor/antenna for a transmitter/receiver associated with a control mechanism which is operable by a properly positioned, matching member to control a device;
- the matching member and other non-matching members containing facilities each of which, when receiving energy transmitted from the transmitter/receiver via the inductor/antenna, produce a respective unique recognition signal in the transmitter/receiver;
control of the device being possible only upon simultaneous occurrence of both operation of the control mechanism and production of a recognition signal by the matching member;
wherein the improvement comprises;
a plurality of electrically interconnected coils functioning as the inductor/antenna, the coils being spaced around the control mechanism to concentrate the energy radiated thereby in the selected region, for maximizing at a selected region external to the control mechanism the energy transmitted by the inductor/antenna and for minimizing the inductor/antenna-transmitted energy at regions other than the selected region to maximize the probability that the recognition signal is produced only by the facilities contained by a member in the selected region even though one or more other members are nearby in regions other than the selected region.
2 Assignments
0 Petitions
Accused Products
Abstract
An improved inductor/antenna (100)improves the selectivity of a recognition system (10) by ensuring that only the transponder (14) closest to the inductor/antenna (100) of an interrogator (12) receives therefrom, and reacts to, an interrogation signal (S1). The improved inductor/antenna (100) also receives the resulting recognition signal (S2) from the transponder (14)for analysis by the interrogator (12). The inductor/antenna (100) includes two or more coils (102,104; 124,126,128,130; 132,134) which may be wound on ferromagnetic cores (108), spaced around a metal mass (46,48) such as a lock cylinder (46) of an ignition switch (24). The shape, number, location and relative winding sense of the coils are selected to shape and locate the energy field (F; 118,122) radiated by the inductor/antenna (100) so that only the transponder (14) in a key (26) which is inserted into or operating the ignition switch (24) responds to the interrogation signal (S1) radiated by the inductor/antenna (100).
114 Citations
50 Claims
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1. An improved inductor/antenna for a transmitter/receiver associated with a control mechanism which is operable by a properly positioned, matching member to control a device;
- the matching member and other non-matching members containing facilities each of which, when receiving energy transmitted from the transmitter/receiver via the inductor/antenna, produce a respective unique recognition signal in the transmitter/receiver;
control of the device being possible only upon simultaneous occurrence of both operation of the control mechanism and production of a recognition signal by the matching member;
wherein the improvement comprises;a plurality of electrically interconnected coils functioning as the inductor/antenna, the coils being spaced around the control mechanism to concentrate the energy radiated thereby in the selected region, for maximizing at a selected region external to the control mechanism the energy transmitted by the inductor/antenna and for minimizing the inductor/antenna-transmitted energy at regions other than the selected region to maximize the probability that the recognition signal is produced only by the facilities contained by a member in the selected region even though one or more other members are nearby in regions other than the selected region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- the matching member and other non-matching members containing facilities each of which, when receiving energy transmitted from the transmitter/receiver via the inductor/antenna, produce a respective unique recognition signal in the transmitter/receiver;
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19. An improved inductor/antenna for a transmitter/receiver associated with a lock which is operable by an inserted matching key to control a device;
- the matching key and other non-matching keys each containing facilities which, when receiving energy radiated by the transmitter/receiver via the inductor/antenna while the key is in the vicinity of the lock, produce a unique recognition signal in the transmitter/receiver;
control of the device being possible only upon simultaneous occurrence of both operation of the lock and production of a recognition signal by the matching key;
wherein the improvement comprises;a plurality of electrically interconnected coils functioning as the inductor/antenna, the coils being spaced around the lock to concentrate the energy radiated thereby in the selected region, for maximizing at a selected region external to the lock the energy radiated by the inductor/antenna and for minimizing the inductor/antenna-radiated energy at other regions external to the lock to maximize the probability that the recognition signal is produced only by the facilities contained by a key in the selected region even though one or more other keys are nearby in the other regions. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
- the matching key and other non-matching keys each containing facilities which, when receiving energy radiated by the transmitter/receiver via the inductor/antenna while the key is in the vicinity of the lock, produce a unique recognition signal in the transmitter/receiver;
Specification