EP0115747A1 - Anti-vol électronique avec une clé électronique - Google Patents

Anti-vol électronique avec une clé électronique Download PDF

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Publication number
EP0115747A1
EP0115747A1 EP83830002A EP83830002A EP0115747A1 EP 0115747 A1 EP0115747 A1 EP 0115747A1 EP 83830002 A EP83830002 A EP 83830002A EP 83830002 A EP83830002 A EP 83830002A EP 0115747 A1 EP0115747 A1 EP 0115747A1
Authority
EP
European Patent Office
Prior art keywords
circuit
inductance
signal
electronic key
receiver part
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Withdrawn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
EP83830002A
Other languages
German (de)
English (en)
Inventor
Pietro Crosetto
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.)
SAET SpA
Original Assignee
SAET SpA
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 SAET SpA filed Critical SAET SpA
Priority to EP83830002A priority Critical patent/EP0115747A1/fr
Publication of EP0115747A1 publication Critical patent/EP0115747A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • 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
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G07C2009/00777—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by induction

Definitions

  • the subject of the present invention is an electronic anti-theft device comprising an electronic key which can be engaged with a fixed receiver part having the function of carrying out a process of identification of the electronic key engaged therewith and of providing an enabling signal to actuator means when the electronic key engaged with the receiver part has predetermined characteristics.
  • Anti-theft devices of the said type generally include electronic keys in each of which there are incorporated electrical or electronic circuits, of the analogue or digital type, connected to electrical contacts fixed to the outer surface of the electronic key.
  • the fixed receiver part is similarly provided with electrical contacts which are accessible from the outside and are intended to couple with the contacts of the key when the latter is inserted in the receiver part to achieve the electrical connection of the internal circuits of the key with the internal circuits of the receiver part.
  • the internal circuit of the electronic key may also be constituted solely by one or more resistors having a calibrated resistance value or may include more complex circuits such as for example memory circuits, shift registers, etc.
  • the devices of the types noted above have a problem due to the fact that their correct operation depends in a decisive manner on the state of the electrical contacts of the key and of the receiver part. In effect, even a single partially oxidised or dirty contact can cause lack of recognition of the correct electronic key.
  • the problem displayed by the said electrical contacts has a further aspect.
  • the receiver part of an anti-theft device is usually installed in a place accessible to the public, for example close to an access door to an environment of which it is desired to allow the.opening only to the possessors of a particular electronic key. This gives rise to a real danger from acts of vandals who might damage the electrical contacts of the receiver part, thus making the identification of the electronic keys subsequently coupled to this receiver part impossible.
  • the object of the present invention is to provide an electronic anti-theft device of the electronic key type which does not have the disadvantages of the prior art devices and in which both the electronic key and the receiver part do not require electrical contacts which are accessible from outside for operation of the device.
  • the present invention provides an electronic anti-theft device of the type specified above, the main characteristic of which lies in the fact that the receiver part comprises:
  • the electronic anti-theft device includes an electronic key 1 which can be engaged with a receiver part 2 fixed, for example, to a wall 3 close to a door for access to an environment (not shown).
  • the receiver part 2 includes an oscillator 4 connected to a resonant circuit of the LC-series type including a capacitor 5 and an inductance 6.
  • 7 shows an amplitude demodulating circuit having its input connected to the common terminal of the inductance 6 and the capacitor 5.
  • the output of the demodulating circuit 7 is connected to a comparator and recognition circuit 8 the output of which is connected to actuator means (not shown) constituted,for example,by devices for opening a lock or devices which control the operation of optical and/or acoustical type alarms.
  • the electronic key 1 includes a second inductance 9 intended to be coupled magnetically to the inductance 6 of the receiver part 2 when the electronic key 1 is engaged with the receiver part.
  • the receiver part 2 includes a support body 2a having afrontally open recess 2b for receiving a complementary shaped projection 1a which extends from an end face of the electronic key 1.
  • Within the projection 1a of the electronic key 1 is located the winding of the inductance 9 which is also constituted by an annular coil.
  • the projection 1a of the key engages the recess 2b of this receiver part and the inductance winding 9 is located concentrically within the inductance winding 6.
  • the magnetic field generated by the current circulating in the inductance 6 is, in this situation, coupled to the inductance winding 9 of the electronic key 1.
  • a transistor 10, of the NPN type has its emitter connected to one end of the inductance winding 9 and its collector connected to the other end of this winding through a resistor 11.
  • This resistor has a rather low resistance value.
  • the point of connection of the inductance winding 9 to the resistor 11 is connected to the anode of a rectifier diode 12, the cathode of which is connected to the input of a stabilized supply 13.
  • a capacitor 14 is connected between the cathode of the diode 12 and earth.
  • AA coded-binary signal generator circuit 15 has its output connecte o the base of the transistor 10 through a resistor 16 and an inverter 15a.
  • the coded-signal generator circuit 15 is arranged to output an information signal of the type illustrated by way of example in Figure 3.
  • This signal includes successive signal portions of equal duration T with each of which is associated an information bit.
  • Each of these signal portions may assume a first or a second waveform according to whether the information bit associated therewith corresponds to a logic "0" or a logic "1".
  • the waveform associated with "0" is preferably constituted by a pulse of duration T having a constant amplitude V 0 .
  • the waveform associated with "1" is constituted by a pulse of duration ⁇ T, having a constant amplitude V o followed or preceded by an interval of duration T - ⁇ in which the signal has substantially zero anplitude.
  • Figure 3 shows a portion of signal associated with the sequence "....010.".
  • the waveform 3 associated with the "0" and the "1" may obviously be interchanged.
  • the oscillator 4 is arranged,in a manner known per se to generate a signal having a predetermined frequency wnich is independent of the variations in the load impedance of the oscillator.
  • the resonant frequency of the resonant circuit comprising the capacitor 5 and the inductance 6, under the conditions in which the electronic key is not engaged with the receiver part is the same as the frequency of the oscillator 4.
  • This frequency may for example, be 100 KHz.
  • the amplitude of the voltage across the inductance 6 remains constant. Consequently the output signal of the demodulator circuit 7 is a continuous signal, which,under these conditions, has a constant amplitude.
  • This coded signal is passed through the inverter 15a to the transistor base 10. Consequently when the coded signal has an amplitude V 0 the transistor 10 is cut off. When the coded signal has a substantially zero amplitude the transistor 10 is saturated. At each change from the condition of saturation to the condition of cut-off of the transistor 10 there is a corresponding variation which can be sensed by the inductive component of the impedance of the resonant circuit in the receiver part 2. The resonant frequency of this circuit, and consequently the amplitude of the voltage across the inductance 6 varies correspondingly. In other words, the coded signal emitted by the generator circuit 15 acts as a signal modulating the amplitude of the voltage across the inductance 6.
  • the amplitude demodulator 7 outputs a unidirectional signal the sequential progress of which follows the variations in the sequential progress of the modulating signal, that is, the signal putput of the generator circuit 15.
  • the signal output of the demodulating circuit 7 is compared by the comparator and recognition circuit 8 with a predetermined reference sequence. When these coincide, the .electronic key 1 coupled to the receiver part 2 is "recognised” and the comparator and recognition circuit 8 outputs an enabling signal to actuator means of the type mentioned above, or prevents the actuation of alarm means. In the case of lack of recognition of the key, the comparator and recognition circuit 8 activates the alarm means or inhibits the actuation of the actuator means mentioned above.
  • the inductance 9 When the signal output of the generator circuit 15 causes saturation of the transistor 10 the inductance 9 is substantially short-circuited. In this situation it is necessary that the short-circuiting of the inductance 9 does not last for an excessively long time, in order to avoid reduction of the supply of the coded-signal generator circuit 15.
  • the coded signal ouput of the generator circuit 15 must not remain at the low level beyond a fraction of the duration T of an individual portion of the coded signal.
  • the above-mentioned characteristic of the coded signal output of the generator circuit 15 lies in the fact that this coded signal has an average v lue which is not zero in any time interval of duration T, ensuring the continuity of the supply to the coded signal generator circuit 15 when the key 1 is inserted in the receiver part 2.
  • the electronic key anti-theft device has the advantage of not requiring the use of fixed contacts for the key and the receiver part and thus is free of all the disadvantges which result from the presence of such contacts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lock And Its Accessories (AREA)
EP83830002A 1983-01-11 1983-01-11 Anti-vol électronique avec une clé électronique Withdrawn EP0115747A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP83830002A EP0115747A1 (fr) 1983-01-11 1983-01-11 Anti-vol électronique avec une clé électronique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83830002A EP0115747A1 (fr) 1983-01-11 1983-01-11 Anti-vol électronique avec une clé électronique

Publications (1)

Publication Number Publication Date
EP0115747A1 true EP0115747A1 (fr) 1984-08-15

Family

ID=8191588

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83830002A Withdrawn EP0115747A1 (fr) 1983-01-11 1983-01-11 Anti-vol électronique avec une clé électronique

Country Status (1)

Country Link
EP (1) EP0115747A1 (fr)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158870A (en) * 1984-05-17 1985-11-20 Waertsilae Oy Ab Locking system
GB2174452A (en) * 1985-05-03 1986-11-05 Ymos Ag A locking device operating by mechanical and electrical means
US4663952A (en) * 1985-01-18 1987-05-12 Egon Gelhard Device for the contactless coupling of the control and output currents between the electronic elements on the locking cylinder and the electronic elements in the key of an electro/mechanical locking device
FR2603933A1 (fr) * 1986-09-17 1988-03-18 Espinadel Gerard Dispositif de commande par rapprochement notamment pour serrures electriques
WO1988003594A1 (fr) * 1986-11-14 1988-05-19 Nederlandse Organisatie Voor Toegepast-Natuurweten Systeme d'identification
FR2619410A2 (fr) * 1986-09-17 1989-02-17 Espinadel Gerard Dispositif de commande par rapprochement notamment pour serrures electriques
GB2209793A (en) * 1985-11-21 1989-05-24 Kokusan Kinzoku Kogyo Kk Wireless signal controlled vehicle lock system
EP0514772A1 (fr) * 1991-05-22 1992-11-25 Kabushiki Kaisha TEC Clé
EP0640734A1 (fr) * 1993-08-31 1995-03-01 Siemens Aktiengesellschaft Système pour la transmission de données et/ou de l'énergie sans contact
EP0659963A1 (fr) * 1993-12-20 1995-06-28 Siemens Aktiengesellschaft Dispositif électronique d'immobilisation pour un véhicule à moteur
FR2721882A1 (fr) * 1994-07-04 1996-01-05 Valeo Securite Habitacle Dispositif de detection de presence de cle et systeme antivol utilisant un tel dispositif
FR2731035A1 (fr) * 1995-02-28 1996-08-30 Ymos France Ensemble constitue d'une serrure electrique de portiere avec fonction de secours electrique et de ses moyens de commande, et equipement comprenant plusieurs de ces ensembles
EP0730071A1 (fr) * 1995-03-03 1996-09-04 Siemens Aktiengesellschaft Système antivol pour un véhicule à moteur
EP0767286A2 (fr) * 1995-10-02 1997-04-09 Motorola, Inc. Système télécommandé d'entrée sans clé et d'immobilisation pour véhicules automobiles
WO1997030255A1 (fr) * 1996-02-15 1997-08-21 Toyota Jidosha Kabushiki Kaisha Systeme de verrouillage pour vehicule
DE19729402A1 (de) * 1997-07-09 1999-02-11 Siemens Ag Diebstahlschutzsystem für ein Kraftfahrzeug
DE19748329A1 (de) * 1997-10-31 1999-05-06 Siemens Ag Vorrichtung und Verfahren zum Erkennen eines in ein Kraftfahrzeug-Schloß eingesteckten Schlüssels
DE4341333B4 (de) * 1993-12-03 2004-04-29 Deltron Elektronische Systeme Gmbh Verfahren zum Betreiben einer elektronischen Wegfahrsperre und elektronische Wegfahrsperre für Kraftfahrzeuge
DE4434587B4 (de) * 1993-10-01 2004-12-16 Marquardt Gmbh Elektronisches Zündstartschloßsystem an einem Kraftfahrzeug
CN101189405B (zh) * 2005-05-31 2012-02-01 三洋电机株式会社 电子式钥匙系统及使用其的二轮机动车
US8122746B2 (en) 1995-09-29 2012-02-28 Hyatt Jr Richard G Electromechanical cylinder plug
US8528373B2 (en) 1997-06-06 2013-09-10 Richard G. Hyatt, Jr. Electronic cam assembly
EP2266123B1 (fr) 2008-03-17 2018-10-10 Powermat Technologies Ltd. Système de transmission inductif
US11387688B2 (en) 2008-07-02 2022-07-12 Powermat Technologies, Ltd. System and method for coded communication signals regulating inductive power transmissions
US11979201B2 (en) 2008-07-02 2024-05-07 Powermat Technologies Ltd. System and method for coded communication signals regulating inductive power transmissions

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3979647A (en) * 1975-06-11 1976-09-07 The Eastern Company Inductively coupled lock
DE2634303A1 (de) * 1976-07-30 1978-02-02 Knorr Bremse Gmbh Elektronische schliesseinrichtung
GB1531951A (en) * 1977-02-04 1978-11-15 Eastern Co Keyhole-less electronic lock

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3979647A (en) * 1975-06-11 1976-09-07 The Eastern Company Inductively coupled lock
DE2634303A1 (de) * 1976-07-30 1978-02-02 Knorr Bremse Gmbh Elektronische schliesseinrichtung
GB1531951A (en) * 1977-02-04 1978-11-15 Eastern Co Keyhole-less electronic lock

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158870A (en) * 1984-05-17 1985-11-20 Waertsilae Oy Ab Locking system
US4663952A (en) * 1985-01-18 1987-05-12 Egon Gelhard Device for the contactless coupling of the control and output currents between the electronic elements on the locking cylinder and the electronic elements in the key of an electro/mechanical locking device
GB2174452A (en) * 1985-05-03 1986-11-05 Ymos Ag A locking device operating by mechanical and electrical means
GB2209793A (en) * 1985-11-21 1989-05-24 Kokusan Kinzoku Kogyo Kk Wireless signal controlled vehicle lock system
GB2209793B (en) * 1985-11-21 1990-12-19 Kokusan Kinzoku Kogyo Kk Wireless signal controlled vehicle lock system
FR2603933A1 (fr) * 1986-09-17 1988-03-18 Espinadel Gerard Dispositif de commande par rapprochement notamment pour serrures electriques
FR2619410A2 (fr) * 1986-09-17 1989-02-17 Espinadel Gerard Dispositif de commande par rapprochement notamment pour serrures electriques
WO1988003594A1 (fr) * 1986-11-14 1988-05-19 Nederlandse Organisatie Voor Toegepast-Natuurweten Systeme d'identification
EP0514772A1 (fr) * 1991-05-22 1992-11-25 Kabushiki Kaisha TEC Clé
US5268560A (en) * 1991-05-22 1993-12-07 Tokyo Electric Co., Ltd. Key device
EP0640734A1 (fr) * 1993-08-31 1995-03-01 Siemens Aktiengesellschaft Système pour la transmission de données et/ou de l'énergie sans contact
DE4434587B4 (de) * 1993-10-01 2004-12-16 Marquardt Gmbh Elektronisches Zündstartschloßsystem an einem Kraftfahrzeug
DE4341333B4 (de) * 1993-12-03 2004-04-29 Deltron Elektronische Systeme Gmbh Verfahren zum Betreiben einer elektronischen Wegfahrsperre und elektronische Wegfahrsperre für Kraftfahrzeuge
EP0659963A1 (fr) * 1993-12-20 1995-06-28 Siemens Aktiengesellschaft Dispositif électronique d'immobilisation pour un véhicule à moteur
FR2721882A1 (fr) * 1994-07-04 1996-01-05 Valeo Securite Habitacle Dispositif de detection de presence de cle et systeme antivol utilisant un tel dispositif
EP0730072A1 (fr) * 1995-02-28 1996-09-04 Ymos France Ensemble constitué d'une serrure électrique de portière avec fonction de secours électrique et de ses moyens de commande
FR2731035A1 (fr) * 1995-02-28 1996-08-30 Ymos France Ensemble constitue d'une serrure electrique de portiere avec fonction de secours electrique et de ses moyens de commande, et equipement comprenant plusieurs de ces ensembles
EP0730071A1 (fr) * 1995-03-03 1996-09-04 Siemens Aktiengesellschaft Système antivol pour un véhicule à moteur
US5889471A (en) * 1995-03-03 1999-03-30 Siemens Aktiengesellschaft Anti-theft system for a motor vehicle
US8141399B2 (en) 1995-09-29 2012-03-27 Hyatt Jr Richard G Electromechanical cylinder plug
US8122746B2 (en) 1995-09-29 2012-02-28 Hyatt Jr Richard G Electromechanical cylinder plug
EP0767286A2 (fr) * 1995-10-02 1997-04-09 Motorola, Inc. Système télécommandé d'entrée sans clé et d'immobilisation pour véhicules automobiles
EP0767286A3 (fr) * 1995-10-02 1998-10-14 Motorola, Inc. Système télécommandé d'entrée sans clé et d'immobilisation pour véhicules automobiles
WO1997030255A1 (fr) * 1996-02-15 1997-08-21 Toyota Jidosha Kabushiki Kaisha Systeme de verrouillage pour vehicule
US8528373B2 (en) 1997-06-06 2013-09-10 Richard G. Hyatt, Jr. Electronic cam assembly
DE19729402A1 (de) * 1997-07-09 1999-02-11 Siemens Ag Diebstahlschutzsystem für ein Kraftfahrzeug
DE19729402C2 (de) * 1997-07-09 2003-07-03 Siemens Ag Diebstahlschutzsystem für ein Kraftfahrzeug
US6351206B1 (en) 1997-07-09 2002-02-26 Siemens Aktiengesellschaft Antitheft protection system for a motor vehicle
US6396390B1 (en) 1997-10-31 2002-05-28 Siemens Aktiengesellschaft Device for detecting a key inserted into a motor vehicle lock
DE19748329C2 (de) * 1997-10-31 1999-12-30 Siemens Ag Vorrichtung zum Erkennen eines in ein Kraftfahrzeug-Schloß eingesteckten Schlüssels
FR2770563A1 (fr) 1997-10-31 1999-05-07 Siemens Ag Dispositif de reconnaissance d'une cle engagee dans une serrure de vehicule automobile
DE19748329A1 (de) * 1997-10-31 1999-05-06 Siemens Ag Vorrichtung und Verfahren zum Erkennen eines in ein Kraftfahrzeug-Schloß eingesteckten Schlüssels
CN101189405B (zh) * 2005-05-31 2012-02-01 三洋电机株式会社 电子式钥匙系统及使用其的二轮机动车
EP2266123B1 (fr) 2008-03-17 2018-10-10 Powermat Technologies Ltd. Système de transmission inductif
US11837399B2 (en) 2008-03-17 2023-12-05 Powermat Technologies, Ltd. Transmission-guard system and method for an inductive power supply
US11387688B2 (en) 2008-07-02 2022-07-12 Powermat Technologies, Ltd. System and method for coded communication signals regulating inductive power transmissions
US11979201B2 (en) 2008-07-02 2024-05-07 Powermat Technologies Ltd. System and method for coded communication signals regulating inductive power transmissions

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