EP0578393A2 - A key for a remote control security device - Google Patents

A key for a remote control security device Download PDF

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Publication number
EP0578393A2
EP0578393A2 EP93304698A EP93304698A EP0578393A2 EP 0578393 A2 EP0578393 A2 EP 0578393A2 EP 93304698 A EP93304698 A EP 93304698A EP 93304698 A EP93304698 A EP 93304698A EP 0578393 A2 EP0578393 A2 EP 0578393A2
Authority
EP
European Patent Office
Prior art keywords
key
shank
circuit
signal
aerial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP93304698A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0578393A3 (sh
Inventor
Stephen Burton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MG Rover Group Ltd
Original Assignee
MG Rover Group Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MG Rover Group Ltd filed Critical MG Rover Group Ltd
Publication of EP0578393A2 publication Critical patent/EP0578393A2/en
Publication of EP0578393A3 publication Critical patent/EP0578393A3/xx
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00944—Details of construction or manufacture

Definitions

  • the present invention relates to a remote control security device which operates by sending electromagnetic radiation signals, usually coded and at radio frequencies, to a receiver on a lock system. Such devices are used frequently on vehicles.
  • Known transmitters for vehicle security systems are usually housed in a unit which is attached to the vehicle door or ignition key, and typically comprise a printed circuit board (PCB) with an RF signal generating circuit, a coding circuit, a switch and an aerial on it, and a battery.
  • PCB printed circuit board
  • the size of the unit is largely affected by the aerial which can take up an area of several square centimeters on the PCB, but is necessary for the production of a suitable electomagnetic signal.
  • the present invention provides a key comprising a key head and a shank shaped for operation of a mechanical lock, an electrical circuit mounted on the key head for producing or detecting an oscillating signal, the shank being coupled to the electrical circuiting to act as an aerial for transmitting or receiving the signal in the form of electromagnetic radiation.
  • a coding circuit and, if the transmitter needs its own power supply, a switch for connecting the coding circuit to a power supply such as a battery are also mounted on the key head to form a single compact unit.
  • a piezo-electric power supply can be used, and can also be mounted on the key head. This has the advantage that the power supply does not run out, as does a battery.
  • the transmitter is only required to operate in response to an electromagnetic signal received, for example, from the security device to be operated.
  • the electrical circuit in that case, includes a sensing means coupled to the shank so that the shank can act as a receiving aerial for passing signals received as electromagnetic radiation to the sensing means.
  • the power for the oscillating circuit with produces the signal to be transmitted can be obtained from the received electromagnetic signal.
  • a known radio frequency transmitter comprises a printed circuit board (PCB) 10 having a battery 12 connected to it, a coding circuit 14 and a switch 16 mounted on it, and an RF oscillating circuit 18 coupled to a track 20 on the PCB which forms an aerial.
  • PCB printed circuit board
  • the switch 16 is depressed which completes the circuit.
  • the coding circuit 14 produces a pulse coded D.C. signal which is fed to the RF oscillating circuit 18, where it is converted to a pulse coded AC signal at radio frequency.
  • the aerial track 20 which is coupled to the oscillating circuit 18 radiates a coded radio frequency electromagnetic signal corresponding to the electric signal produced by the oscillating circuit 18.
  • the PCB and battery are enclosed in a unit which can be attached to a key ring together with a conventional vehicle door or ignition key.
  • the key of the present invention comprises a head 30 and a shank 32 which is shaped to operate a mechanical door or ignition lock.
  • a PCB 34 mounted in the key head 30 is a PCB 34 having a coding circuit 36, a switch 38, and a radio frequency oscillating circuit 40 on it.
  • a battery 42 is held between two clip connectors 44 which connect it to the PCB 34.
  • the oscillating circuit 40 is coupled to the shank 32 by a coupling connection 44.
  • the key functions in the same way as the known transmitter, except that the shank 32 acts as a transmitting aerial for sending coded signals to a vehicle security device.
  • the coupling connection 44 is shown as an electical connection. However, the oscillating circuit 40 and the shank 32 can be coupled simply by being arranged in suitable positions relative to one another.
  • the radio frequencies used are the same as those in known devices, and are often between 200 and 500 MHz. At these frequencies it is possible to achieve sufficient matching with the shank 32.
  • the second embodiment of the invention is for use in a system where the security device on a vehicle continuously emits a coded radio frequency signal which is picked up by a hand held receiver, which then returns a coded signal to operate the security device.
  • the key comprises a key head 50 and a shank 52.
  • the key head 50 has a rectifier circuit 54, a code sensing circuit 56, a coding circuit 58 and an RF oscillating circuit 60.
  • the shank 52 is coupled to the rectifier circuit 54 which converts the received pulse coded RF signal to a pulse coded DC signal.
  • the code sensing circuit 56 receives the DC signal and, if the correct code is detected, sends a signal to the coding circuit 58. The signal is then re-coded, converted to a coded RF signal by the oscillating circuit 60 and transmitted by the shank 52 which is coupled to the oscillating 60 and acts as a transmitting aerial. No power supply is needed since all the power required comes from the received RF signal.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lock And Its Accessories (AREA)
EP93304698A 1992-07-04 1993-06-16 A key for a remote control security device Withdrawn EP0578393A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9214249 1992-07-04
GB929214249A GB9214249D0 (en) 1992-07-04 1992-07-04 A key for a remote control security device

Publications (2)

Publication Number Publication Date
EP0578393A2 true EP0578393A2 (en) 1994-01-12
EP0578393A3 EP0578393A3 (sh) 1994-03-02

Family

ID=10718214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93304698A Withdrawn EP0578393A2 (en) 1992-07-04 1993-06-16 A key for a remote control security device

Country Status (2)

Country Link
EP (1) EP0578393A2 (sh)
GB (1) GB9214249D0 (sh)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4410338A1 (de) * 1994-03-25 1995-09-28 Telefunken Microelectron Datenübertragungssystem
FR2748161A1 (fr) * 1996-04-29 1997-10-31 Valeo Electronique Cle de vehicule automobile a telecommande rf
DE19729867A1 (de) * 1997-07-11 1999-01-14 Bayerische Motoren Werke Ag Fahrzeug mit einem tragbaren Fernbedienungs-Sender und einem Schlüssel sowie Verfahren zum Gebrauch dieses Fahrzeugs

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4185621A (en) * 1977-10-28 1980-01-29 Triad, Inc. Body parameter display incorporating a battery charger
GB2051442A (en) * 1979-03-30 1981-01-14 Howard J A A security system
WO1991014065A1 (de) * 1990-03-07 1991-09-19 Siegfried Sikora Schlosseinheit eines kfz mit ferngesteuert betätigbarem türschloss
WO1992002911A1 (en) * 1990-08-10 1992-02-20 Pietro Girotto Automatic control device for an anti-theft system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4185621A (en) * 1977-10-28 1980-01-29 Triad, Inc. Body parameter display incorporating a battery charger
GB2051442A (en) * 1979-03-30 1981-01-14 Howard J A A security system
WO1991014065A1 (de) * 1990-03-07 1991-09-19 Siegfried Sikora Schlosseinheit eines kfz mit ferngesteuert betätigbarem türschloss
WO1992002911A1 (en) * 1990-08-10 1992-02-20 Pietro Girotto Automatic control device for an anti-theft system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4410338A1 (de) * 1994-03-25 1995-09-28 Telefunken Microelectron Datenübertragungssystem
FR2748161A1 (fr) * 1996-04-29 1997-10-31 Valeo Electronique Cle de vehicule automobile a telecommande rf
DE19729867A1 (de) * 1997-07-11 1999-01-14 Bayerische Motoren Werke Ag Fahrzeug mit einem tragbaren Fernbedienungs-Sender und einem Schlüssel sowie Verfahren zum Gebrauch dieses Fahrzeugs
DE19729867B4 (de) * 1997-07-11 2006-04-27 Bayerische Motoren Werke Ag Fahrzeug mit einem tragbaren Fernbedienungs-Sender und einem Schlüssel sowie Verfahren zum Gebrauch dieses Fahrzeugs

Also Published As

Publication number Publication date
EP0578393A3 (sh) 1994-03-02
GB9214249D0 (en) 1992-08-19

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