EP0311036A2 - Dispositif de surveillance d'articles et ou de personnes - Google Patents

Dispositif de surveillance d'articles et ou de personnes Download PDF

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Publication number
EP0311036A2
EP0311036A2 EP88116455A EP88116455A EP0311036A2 EP 0311036 A2 EP0311036 A2 EP 0311036A2 EP 88116455 A EP88116455 A EP 88116455A EP 88116455 A EP88116455 A EP 88116455A EP 0311036 A2 EP0311036 A2 EP 0311036A2
Authority
EP
European Patent Office
Prior art keywords
alarm
transmitter
signal
electronic circuit
code
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.)
Granted
Application number
EP88116455A
Other languages
German (de)
English (en)
Other versions
EP0311036A3 (fr
EP0311036B1 (fr
Inventor
Thomas Enkelmann
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.)
Conti Temic Microelectronic GmbH
Original Assignee
Tec Computer GmbH
T E C COMPUTER GmbH
Temic Telefunken Microelectronic GmbH
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 Tec Computer GmbH, T E C COMPUTER GmbH, Temic Telefunken Microelectronic GmbH filed Critical Tec Computer GmbH
Publication of EP0311036A2 publication Critical patent/EP0311036A2/fr
Publication of EP0311036A3 publication Critical patent/EP0311036A3/fr
Application granted granted Critical
Publication of EP0311036B1 publication Critical patent/EP0311036B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles

Definitions

  • the invention relates to a device for monitoring things and / or people according to the preamble of claim 1.
  • resonator marks which are attached to the object to be secured in each case and contain an oscillating circuit which, when the object is brought through a "lock", disturbs an HF field generated at this location, whereupon an alarm is triggered.
  • a shoplifter succeeds in removing the tag from the object to be secured before going through the lock, the theft cannot be known.
  • the RF transmitter is designed to emit a coded RF signal
  • the electronic circuit comprises an encoder which emits an alarm signal to the alarm generator to trigger an alarm in the presence of a defined information content of the coded RF signal.
  • This design of the device ensures, on the one hand, increased interference immunity compared to the conventional system of the type mentioned at the outset, which always emits an acoustic alarm when it reaches outside the area in which an uncoded HF field is generated. It is now no longer possible even for technically adept long fingers to mute the device with the aid of a simple transmitter, since when an uncoded or incorrectly coded HF signal is present, an alarm is emitted just as if any HF signal is absent. If the device is designed in such a way that an alarm is given when a specific signal is present, then the interference immunity to external influences is also significantly increased in this case. For example, it cannot happen that all objects provided with the devices in a toy department of a department store give an alarm when a radio-controlled toy car is presented to a customer.
  • the coding can "individualize” the visitor. If the device is designed in such a way that it then emits an alarm when it receives a signal with a specific code, it is possible to set up transmitters in the areas which are not to be entered by the visitor and which emit this code. There are z. B. also easily conceivable different "levels" that overlap each other within a factory site can be defined by RF transmitters which emit different types of codes. Depending on the classification of the visitor, the visitor then receives a device with a decoder, which issues an alarm when a certain, possibly also different, code is present (in an OR combination).
  • this design and use of the device as a visitor badge not only enables visitors to be monitored, but also, for. B. also an automatic "pilot" of the visitor, for example, through a larger factory site, which is divided into "grid squares" by transmitters with different codes.
  • the device designed in this way can also be used advantageously as an anti-theft device.
  • a department store with three floors so you can.
  • B. assign a special code to each floor, to which all security marks are set with which the objects on this floor are provided.
  • the encoders of the RF transmitters are then set so that each floor is provided with transmitters which build up corresponding RF fields, but the code which triggers an alarm is not emitted on the floor in question. This triggers an alarm when a secured item is moved from one floor to the other.
  • an RF field with appropriate coding must be present in order to keep a security mark silent.
  • the device is designed in such a way that an alarm, once triggered, continues to be triggered for so long radiates until the device receives an RF signal that is modulated with a second code that results in the alarm being turned off.
  • the associated RF transmitters are preferably designed as handheld devices, the z. B. every department store detective carries with him.
  • the safety of the devices in question is further determined by the life of the battery used. Since the housing of the devices must of course not exceed a certain maximum and the costs for large batteries are higher than for small batteries, only a limited operating time of the devices is possible. After the battery has tired, an alarm is no longer triggered. If the operating time of the devices with a battery pack is very short, the statistical probability of a used battery is higher than for devices with a longer operating time. To solve this problem, the invention proposes to provide a clock in the device, which at defined intervals, for. B. once per second, emits switch-on signals which "awaken" the remaining active parts of the device by switching on their power supply, while between these signals these active parts "sleep".
  • the duration of the "wake-up phase” is preferably chosen to be longer for the HF alarm part than for the monitoring of the security element, since during the wake-up phase at least one complete code signal consisting of several bits must be received in any case, while for the monitoring of the conductive security element, so to speak a single bit is enough.
  • the device z. B. operate in a 1: 9 ratio between active and "sleeping" state, which leads to considerable power savings and thus to a significant extension of the life of the battery.
  • a clock signal for the decoder can be generated via the clock generator if the clock generator (which is preferably a quartz oscillator contains) synchronized with the received RF code signals.
  • the radiated alarm can be either an acoustic signal or an RF signal that, for. B. alarms the department store detective via a transmitter located at this. It is advantageous here if the emitted RF signal is coded, since this code then z. B. can be selected specifically for the object provided with the security mark. The department store detective then knows e.g. B. that just a secured part from the jewelry or leather goods department or ... was stolen. Of course, it is also possible to combine both types of alarm.
  • the device for monitoring comprises an RF transmitter 10, which encodes the RF signals emitted by an antenna 13 from a transmitter 12 via an encoder 11.
  • the coded RF signals are received by the security mark, which is indicated in FIG. 1 with a broken line and is designated by the reference number 15, via an antenna 17, through which they arrive in an RF receiver 16, which transmits the signals via passive Components (LC parallel resonant circuit with downstream demodulator and final pulse shaper) converted into signals that are "understood" by digital circuits.
  • the digital signals obtained in this way arrive in the decoder 20, specifically there in a serial / parallel converter which always reads in a complete code word.
  • the stored code word is transferred in parallel to a comparator 22 which compares this code word with a code word which is fed to it via a coding switch.
  • the comparison signal from the comparator 22 ("1" if there is a match, "0" if there are different code words) is fed to an input of an OR gate 24.
  • the other, inverting input of the OR gate 24 is led to a logic "1" via a fuse element 14, a wire.
  • the security mark 15 is attached to the object to be protected.
  • the output of the OR gate 24 is led to the input of an alarm memory 31, which in the arrangement shown in FIG. 1 is preferably designed as a retriggerable monoflop with a long output pulse duration.
  • the output of the alarm memory 31 is fed to the input of a tone generator 32, which at the same time contains a driver that a sound converter 33 (preferably a Piezo sound transducer).
  • a sound converter 33 preferably a Piezo sound transducer
  • an HF alarm transmitter 30 is provided, in which the output of the alarm memory 31 activates an HF alarm transmitter 34, which is activated via an HF alarm encoder 35 emits adjustable coded RF signal. This RF signal can then be received and identified in an alarm receiver, not shown.
  • the coding switch 23 and the coders 11 and 35 are preferably at least partially adjustable, so that at least every customer receives devices with a special code. Furthermore, as indicated at the outset, goods or person-specific brands 15 can be produced without major conversions or design changes being necessary for this.
  • a difference of the embodiment of FIG. 3 to that of FIG. 1 is that the digital words stored in the serial / parallel converter 21 both the comparator 22 with coding switch 23 for triggering an alarm, and a further comparator 22 'with another Coding switch 23 'are supplied.
  • the alarm transmitter 30 differs from the alarm transmitter 30 described with reference to FIG. 1 in another embodiment of the alarm memory 31.
  • This alarm memory 31 is connected to the output of the OR gate 24 with its activation input Set, as shown previously.
  • the alarm memory 31, however, also has an erase input Res, which is connected to a corresponding output terminal of the further comparator 22 ′ denoted in FIG. 3 and via which a once triggered alarm can be stopped.
  • the delete code (which is stored in the coding switch 23 ') is emitted by a - not shown - handheld transmitter, the z. B. carries the department store detective with him.
  • FIG. 3 Another difference between the embodiment of the invention shown in FIG. 3 and that according to FIG. 1 is that the comparator 22 is followed by a divider 25 which divides by two in the embodiment shown in FIG. 3.
  • This divider 25 now ensures that a signal is only present at the terminal Al of the decoder 20 which triggers an alarm if the alarm code has been detected twice. This provides increased security against false alarms, whereby the division ratio can of course be increased to increase redundancy and thus to increase interference immunity.
  • the further comparator 22 ' is followed by such a divider.
  • the arrangement is simplified in that only part of the information can be set in the alarm code as well as in the delete code, which is accomplished in the embodiment of the invention shown in FIG. 4 in that only bits 4, 7, 11 and 15 are guided to the (four-digit) coding switch 23, while the rest of the total of 16 bits are at defined, not subsequently changeable logic levels.
  • the coding switch 23 can be designed to reduce costs in the form of short-circuit plugs in a manner known per se.
  • a pull-up resistor 27 is provided between the input of an inverter 26 and the positive logic level (here Vcc), the output of the inverter 26 being at an input of the OR gate 24.
  • the input of the inverter 26 is still on the fuse element 14 on one end of an inductor 18 (Ferrocup), the other terminal of which is connected to ground. If the fuse element 14 is cut, the input of the inverter 26 is pulled to a positive level, so that a 0 and (via the inverting input of the OR gate 24) alarm is given at the output of the inverter 26.
  • the securing element is designed as a coaxial cable, the outer sheath 17 of which is led to the antenna input of the RF receiver 16.
  • a short circuit of the received HF Performance avoided.
  • this arrangement ensures that the (technically experienced) long finger cannot simply detach the antenna of the security tag in order to prevent an HF alarm being triggered.
  • a two-wire line can also be used here (preferably with a small distance between the wires), with the advantage that a relatively long antenna can be produced in a mechanically simple manner.
  • FIG. 6 A further, particularly preferred embodiment of the invention is described below with reference to FIG. 6, which initially differs from the previously described embodiments in that the alarm memory 31 comprises two cross-coupled NAND latches 37, 38, so that an alarm which has been triggered once remains until a reset signal is output at the terminal Res of the decoder 20.
  • a clock generator 40 is provided, which contains a quartz oscillator 41 with a divider 42 connected downstream. The reset input of the divider 42 is routed via a synchronizing circuit 19 to the output of the RF receiver 16, so that when a coded RF signal is received, the clock generator 40 is synchronized with the transmitted code.
  • the clock generator 40 generates a clock pulse which is supplied to the decoder 20 in a manner known per se. Furthermore, two electronic switches (FET) 43 and 44 are controlled via the counter 42, which the output voltage of the battery 45 z. B. once every second for defined periods of time at outputs A and B of clock generator 40. In the embodiment of the invention shown in FIG. 6, the battery voltage is longer at point A than at point B.
  • the supply connections Vcc of the components provided in the clock generator 40 are also constantly connected to the battery 45 connected as the power supply input Vcc of the alarm memory 31.
  • the power supply input Vcc of the tone generator / driver 32 is connected to the continuous power supply via an FET 36, the gate connection of which is located on the output of the alarm memory 31. If an alarm is triggered, the tone generator / driver 32 is supplied with current, otherwise it is disconnected from the battery 45.
  • the power supply input Vcc of the decoder 20 is connected to the terminal A of the clock generator 40, as is that of the OR gate 24.
  • the pull-up resistor 27, like the power supply terminal of the inverter 26, is at point B. This ensures that the power supply for the active components of the arrangement are only switched on in cycles (for example once every second) for the minimum time required to detect an alarm signal or to cut through the fuse element 14.
  • a switch 29 is provided in an otherwise identical arrangement as the fuse element 14, a pull-up resistor 28 being provided here.
  • the switch 29 is arranged in the housing (not shown) such that it is also closed when the housing is closed. If a long finger opens the housing (e.g. to remove the battery), an alarm is given.
  • a counter 39 is provided, the reset input of which is connected to the terminal Res of the decoder 20 (for example according to FIGS. 3 or 4) and the counting input (count) at point A of the clock generator 40 lies.
  • the supply terminal Vcc is continuously connected to the battery 45.
  • the output of the counter 39 at which a logical "1" appears when the counter overflows, is connected to a further input of the OR gate 24.
  • the functioning of this arrangement is such that the counter counts by one each time the arrangement "wakes up", ie when all active components are supplied with current. Every time a delete code is sent when the circuit wakes up, the counter 39 is reset, and can therefore never overflow and trigger an alarm if the delete code is sufficiently frequent.
  • an alarm is triggered. If the counter 39 is designed such that it can only count to two, this corresponds to an increase in redundancy, as is achieved by the counter 25 according to FIG. 3. In this embodiment of the invention, an alarm is therefore triggered in four cases, firstly when no delete code is received, secondly when an alarm code is received, thirdly when the security element 14 is cut and for fourth when the housing is opened and thus the switch 29 are opened.
  • the clock generator 40 can be designed such that it emits either a periodic clock signal or a clock signal with a randomly controlled clock interval and controls the electronic switches 43 and 44 and thus also the outputs A and B accordingly.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)
EP88116455A 1987-10-07 1988-10-05 Dispositif de surveillance d'articles et ou de personnes Expired - Lifetime EP0311036B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3733808 1987-10-07
DE19873733808 DE3733808A1 (de) 1987-10-07 1987-10-07 Vorrichtung zur ueberwachung von sachen und/oder personen

Publications (3)

Publication Number Publication Date
EP0311036A2 true EP0311036A2 (fr) 1989-04-12
EP0311036A3 EP0311036A3 (fr) 1991-01-16
EP0311036B1 EP0311036B1 (fr) 1995-03-22

Family

ID=6337746

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116455A Expired - Lifetime EP0311036B1 (fr) 1987-10-07 1988-10-05 Dispositif de surveillance d'articles et ou de personnes

Country Status (5)

Country Link
US (1) US4851815A (fr)
EP (1) EP0311036B1 (fr)
JP (1) JPH01133196A (fr)
AT (1) ATE120296T1 (fr)
DE (2) DE3733808A1 (fr)

Cited By (1)

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WO1996020463A1 (fr) * 1994-12-28 1996-07-04 Roulleaux Robin Veronique Procede et dispositif pour la detection, l'identification et la protection de biens notamment contre le vol

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DE3933684A1 (de) * 1989-10-09 1991-04-11 Telefunken Electronic Gmbh Elektronisches warensicherungssystem
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JP6369802B2 (ja) * 2014-07-30 2018-08-08 株式会社Ksm 商品管理システムおよびｉｄタグ
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GB2137391A (en) * 1983-03-14 1984-10-03 Sensormatic Electronics Corp A portable alarmed electronic article surveillance security system
CH657466A5 (en) * 1984-03-02 1986-08-29 Quadim S A Apparatus for monitoring the nearness of an object
GB2181326A (en) * 1985-09-30 1987-04-15 Sensormatic Electronics Corp Electronic surveillance using self-powered article attached tags
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996020463A1 (fr) * 1994-12-28 1996-07-04 Roulleaux Robin Veronique Procede et dispositif pour la detection, l'identification et la protection de biens notamment contre le vol
FR2728991A1 (fr) * 1994-12-28 1996-07-05 Robin Veronique Roulleaux Procede et dispositif pour la detection, l'identification et la protection de biens notamment contre le vol
US5838234A (en) * 1994-12-28 1998-11-17 Roulleaux-Robin; Veronique Method and device for sensing, identifying and protecting goods, particularly from theft

Also Published As

Publication number Publication date
EP0311036A3 (fr) 1991-01-16
DE3853395D1 (de) 1995-04-27
US4851815A (en) 1989-07-25
DE3733808C2 (fr) 1992-03-12
ATE120296T1 (de) 1995-04-15
DE3733808A1 (de) 1989-05-11
JPH01133196A (ja) 1989-05-25
EP0311036B1 (fr) 1995-03-22

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