EP0811212B1 - Überwachungsvorrichtung - Google Patents

Überwachungsvorrichtung Download PDF

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Publication number
EP0811212B1
EP0811212B1 EP96901078A EP96901078A EP0811212B1 EP 0811212 B1 EP0811212 B1 EP 0811212B1 EP 96901078 A EP96901078 A EP 96901078A EP 96901078 A EP96901078 A EP 96901078A EP 0811212 B1 EP0811212 B1 EP 0811212B1
Authority
EP
European Patent Office
Prior art keywords
state
monitoring device
changes
detected
change
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.)
Expired - Lifetime
Application number
EP96901078A
Other languages
English (en)
French (fr)
Other versions
EP0811212A1 (de
Inventor
Patrick Mccart
Stephen Cameron
Donal Higgins
Samuel Thompson
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.)
Compusafe International Ltd
Original Assignee
Compusafe International 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
Priority claimed from GBGB9503737.0A external-priority patent/GB9503737D0/en
Application filed by Compusafe International Ltd filed Critical Compusafe International Ltd
Publication of EP0811212A1 publication Critical patent/EP0811212A1/de
Application granted granted Critical
Publication of EP0811212B1 publication Critical patent/EP0811212B1/de
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
    • G08B13/1409—Mechanical actuation by lifting or attempted removal of hand-portable articles for removal detection of electrical appliances by detecting their physical disconnection from an electrical system, e.g. using a switch incorporated in the plug connector
    • G08B13/1418—Removal detected by failure in electrical connection between the appliance and a control centre, home control panel or a power supply

Definitions

  • THIS INVENTION relates to a monitoring device for monitoring an apparatus having first and second states and for providing an output signal indicating that the apparatus has undergone a pre-determined sequence of changes of state.
  • Prior art document WO-A-8 501 708 discloses an anti-theft ignition system in which the ignition system is enabled once a predetermined series of pulses are input from the ignition switch and compared with a stored code.
  • the monitoring apparatus of the present invention finds particular application as a security or anti-theft device for monitoring changes in the state of an apparatus to be protected and providing an alarm signal in the event of unauthorised removal of the apparatus.
  • the monitoring device may provide an alarm signal in the event that the equipment is disconnected from its power source and moved without a pre-determined sequence of connections to and disconnections from its power source having first been carried out.
  • the present invention provides a monitoring device for monitoring an apparatus having first and second states, comprising: detecting means for detecting each change of state of the apparatus between its first and second states; timing means for measuring the duration between successive changes in the state of the apparatus as detected by the detecting means; memory means for storing first, second and third pre-determined durations; comparing means for comparing the timing of detected changes in the state of the apparatus and delivering an output signal in the event that first and second changes of state of the apparatus are detected within a duration not exceeding the first pre-determined duration, a third change of state is detected after the second change of state at a time corresponding to the second pre-determined duration and a fourth change of state is detected after the third change of state at a time corresponding to the third pre-determined duration; and means for emitting timing signals during the second and third durations after detecting the second and third changes of state respectively.
  • an anti-theft device embodying the present invention comprises a monitoring device 1, a trembler unit 2 and an alarm unit 3 and serves to protect an electrical or electronic apparatus 4 against unauthorised removal.
  • the monitoring device has a pair of input terminals 1A and 1B which are respectively connected to the power lines 4A and 4B of the apparatus 4 to be protected so as to sense the voltage applied to the apparatus 4.
  • the voltage on the power lines 4A and 4B may vary from 1.5 to 350V AC or DC.
  • the trembler unit 2 is incorporated in the monitoring device 1 which is mounted on the apparatus 4 to be protected and includes a trembler switch 5 which operates in response to movement of the apparatus 4 and a trembler circuit 6 providing a motion-detected signal on an output line 7 of the trembler unit.
  • the motion detected signal delivered by the trembler unit is applied to an input 8 of the alarm unit 3 via a disarm latch 9 which, in its normal condition, connects the output line 7 to the input line 8, thereby passing the output signal of the trembler unit 2 to the alarm unit 3.
  • the alarm unit 3 comprises a sound control 10 connected to the input line 8 and having an output line 11 connected to a piezo-electric buzzer 12.
  • the monitoring device 1 comprises a voltage rectifier 14 connected to the input terminals 1A and 1B and having a charger output 15 connected to a battery charger 16 arranged to charge a battery 13 constituting an internal power supply of the monitoring device 1.
  • the voltage rectifier 14 charges up the battery 13 via the charger 16.
  • the equipment 4 is not powered, i.e. switched off, the battery 13 provides operating power for the device.
  • a signal output of the rectifier 14 is optically coupled to the input of a pulse detector 17 by means of an opto-isolator which comprises a transmitter in the form of a light-emitting diode 18 connected to the signal output of the rectifier and a receptor in the form of a light-sensitive transistor 19 connected to the input of the pulse detector 17.
  • the output line 20 of the pulse detector 17 is connected via a hold and extend circuit 21 to a counter 22 which receives clock pulses from an internal clock 23 of the monitoring device 1.
  • the counter 22 is connected to first and second latches 24 and 25 and has a first output 26 connected to a sequence correct counter 27.
  • a second output 28 is connected to a second input of the sound control 10 of the alarm unit 3.
  • the sequence correct counter 27 has a first output 29 connected to a control input of the disarm latch 9 and a second output 30 connected to a third input of the sound control 10 of the alarm unit 3.
  • the pulse detector 17 detects each change in the power status of the apparatus 4 between its powered and unpowered states and delivers an output signal on its output 20 to hold and extend circuit 21 which is set to an interpretation state if it receives two output signals from the detector 17 within a first pre-determined duration which may be selected to be between 0.1 seconds and 1 hour but is typically of the order of five seconds.
  • the first and second latches 24 and 25 respectively store second and third pre-determined durations for comparison with counts accumulated in the counter 22 during operation of the device as hereinafter described.
  • the sequence correct counter 27 applies a disabling signal on its output 30 to the sound control 10 of the alarm unit 3 when the apparatus 4 is connected to its power source and applies an enabling signal to the sound control 10 on output 30 when the apparatus 4 is disconnected from its power source.
  • the anti-theft device described above with reference to Figure 1 operates so that activation of the alarm unit 3 occurs in the event that the apparatus 4 is moved whilst the equipment is disconnected from the power supply without the power supply to the apparatus 4 having first been subjected to a coded sequence of on/off states.
  • the output 30 of the correct sequence counter 27 disables the sound control 10 of the alarm unit 3 and movement of the apparatus 4, resulting in movement of the trembler unit 2, does not activate the piezo-electric buzzer 12 of the alarm unit.
  • the apparatus 4 must be first subjected to a coded sequence of connections and disconnections of its power supply in order to render the disarmed latch 9 operative to disconnect the alarm unit 3 from the trembler unit 2, since the output signal on line 30 from the sequence correct counter 27 will enable the sound control 10 of the alarm unit 3 on disconnection of the power from the apparatus 4.
  • the first step in performing the coded sequence of changes in the power status of the apparatus 4 is to switch the apparatus on and then off within a period of time which does not exceed the first pre-determined duration set by the pulse detector unit 17. This is represented by the pulse 31 in diagram 3a of Figure 3. Detection of pulse 31 by hold and extend circuit 21 at its input causes the circuit 21 to enter its interpretation state as shown at 32 in diagram 3b of Figure 3. After a pre-determined time delay determined by circuit 21 and selectable between 0 seconds and 1 hour, the counter 22 is started by a signal from the circuit 21 as indicated at 33 in diagram 3c of Figure 3.
  • the counter 22 provides an output on line 28 to the sound control 10 of the alarm unit 3 to cause the piezo electric buzzer 12 of the alarm unit to emit timing signals in the form of a regular series of short sounds or beeps as indicated at 35 on diagram 3d of Figure 3.
  • the power supply is again switched on as indicated at 36 in diagram 3a of Figure 3.
  • the circuit 21 stops the counter 22 and the counter then compares the count at this time with the second pre-determined duration set by latch 24 and, if it corresponds, a first correct sequence pulse is delivered to the correct sequence counter 27 on output line 26 of the counter 22 as shown at 37 in diagram 3e of Figure 3.
  • the counter 22 is again started as indicated at 36 in diagram 3c of Figure 3 and the piezo electric buzzer 12 emits a further series of beeps 35.
  • the apparatus 4 is again switched off as indicated at 38 in diagram 3a of Figure 3, thereby stopping the counter 22 as indicated at 39 in diagram 3c of Figure 3 and stopping the emission of beeps by the piezo electric buzzer 12. If the count in the counter 22 at this time corresponds to the third pre-determined duration stored in latch 25, the counter delivers a second correct sequence pulse on its output 26 to the correct sequence counter 27 as indicated at 40 in diagram 3e of Figure 3.
  • the correct sequence counter 27 Upon receipt of this second correct sequence pulse 40, the correct sequence counter 27 delivers a signal on its output 29 to operate the disarm latch 9 as indicated at 41 in diagram 3f of Figure 3, so as to prevent output signals from the trembler unit 2 from reaching the alarm unit and thereby enabling movement of the disconnected apparatus 4 without activation of the alarm unit 3.
  • This alarm disarmed state is preferably indicated by the device 1 emitting, for example, five short tones.
  • the disarm latch 9 will be in its normal condition and the alarm unit 3 will be activated by the trembler unit 2.
  • the device 1 When the power to the apparatus 4 is disconnected, the alarm not being disarmed, the device 1 will emit, for example, three short tones - an alarm active indication. This warns, for example, a shop assistant that movement of the apparatus 4 in this condition would trigger the trembler to cause an alarm condition.
  • monitoring device 1 is described as monitoring the voltage on the power lines 4A and 4B, it is envisaged that the device could equally be arranged to monitor current, for example in the range of 1mA to 1A.
  • the above device 1 has been described as having its inputs 1A and 1B connected to the power lines of the apparatus 4, the inputs may be directly or indirectly coupled to the power lines or indeed signal lines of the apparatus 4.
  • the alarm unit 3 can be activated by disconnection of the apparatus 4 from its power source and unauthorised removal of the apparatus 4, the alarm can be simply de-activated merely by re-applying power to the apparatus to the power supply.
  • FIG. 2 shows the monitoring device 1 embodying the present invention incorporated in another anti-theft device which also includes a tamper system comprising, for example, a light-sensitive resistor 50 provided inside a housing of the device and connected to the disarm latch 9, so that illumination of the resistor 50, resulting for example from a person tampering with the housing of the device or the equipment in which the device is installed, will cause an output signal to be delivered to the disarm latch 9 and thereby activate the alarm.
  • a tamper system comprising, for example, a light-sensitive resistor 50 provided inside a housing of the device and connected to the disarm latch 9, so that illumination of the resistor 50, resulting for example from a person tampering with the housing of the device or the equipment in which the device is installed, will cause an output signal to be delivered to the disarm latch 9 and thereby activate the alarm.
  • a signal applied to input 51 of the device 1 determines whether the device is in a monitoring state to monitor change of the power states of the apparatus 4 or is in a programming state in which selected pre-determined periods and a delay period may be programmed into the latches 24 and 25 and the circuit 21 via inputs 52-55.
  • a signal applied to input 56 of device 1 selects whether the presence or absence of voltage or current determines the change of state periods.
  • the tamper system may be provided as a separate unit located externally of the housing of the device 1.
  • This tamper system can be disarmed by entering an appropriately coded sequence through the power lines of the apparatus 4 being monitored. Should the tamper system be activated, the switching of the apparatus 4 being monitored to an on state will not silence the alarm. The internal power source of the monitoring device 1 must be removed, in this case, to silence the tamper alarm.
  • the buzzer 12 has two levels of output an attenuated level and an alarmed level.
  • the attenuated level is muted compared to the alarmed level.
  • the attenuated level is used for signalling all beeps, tones and indications.
  • the alarm level is used only when the unit is activated as an alarm.
  • a monitoring device or anti-theft device embodying the present invention may be incorporated during manufacture into an apparatus to be monitored or may be provided as an attachment thereto.
  • the device 1 is preferably provided with a battery monitor which generates two tones intermittently over a designated period should the internal power supply, the battery 13, of the device 1 fall below a certain level.
  • the device 1 When the device 1 is initially powered up and is not connected to the apparatus 4 being monitored or no signal has yet been received by the device 1 from the apparatus 4, then the device is in a so-called 'test' state. This state is terminated when a signal from the apparatus 4 being monitored is first received.
  • the device 1 When the device 1 is in the 'test' state, it generates test tones upon activation of various signals. For example, when the alarm detection circuit is activated (e.g. by triggering the trembler) it generates a series of tones. This series of tones is extended should the tamper system also be activated.
  • the device 1 may be placed in a programming state either by initiation by an external trigger or automatically when the device 1 is first in the disarmed state.
  • the device has a default code sequence which is accepted as the code for the device. Should the user of the device allow the disarming state to time out (time-out occurring when the device generates the first sequence of tones and the equipment does not change state during this period), then the default code sequence is adopted.
  • a monitoring device embodying the present invention presents the great advantage that it is armed and disarmed merely by connecting and disconnecting its power supply and does not require the use of a separate key switch for arming and disarming the alarm as required by presently available anti-theft devices used to protect such apparatus.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Claims (13)

  1. Überwachungseinrichtung (1) zum Überwachen einer Vorrichtung, die einen ersten und einen zweiten Zustand aufweist, mit folgenden Merkmalen: eine Erfassungsvorrichtung (17) zum Erfassen jeder Zustandsänderung der Vorrichtung zwischen dem ersten und dem zweiten Zustand; eine Zeitgebervorrichtung (22, 23) zum Messen der Dauer zwischen aufeinanderfolgenden Zustandsänderungen der Vorrichtung, die von der Erfassungsvorrichtung erfaßt wurden; eine Speichervorrichtung (21, 24, 25) zum Speichern einer ersten, einer zweiten und einer dritten vorgegebenen Dauer; eine Vergleichervorrichtung (27) zum Vergleichen der Zeiten der erfaßten Zustandsänderungen der Vorrichungen und zum Abgeben eines Ausgangssignals in dem Fall, daß eine erste und eine zweite Zustandsänderung der Vorrichtung innerhalb einer Dauer erfaßt werden, welche die erste vorgegebene Dauer nicht überschreitet eine dritte Zustandsänderung nach der zweiten Zustandsänderung zu einer Zeit erfaßt wird, die der zweiten vorgegebenen Dauer entspricht, und eine vierte Zustandsänderung nach der dritten Zustandsänderung zu einer Zeit erfaßt wird, die der dritten vorgegebenen Dauer entspricht; und eine Vorrichtung (3) zum Ausgeben von Zeitsignalen während der zweiten und der dritten Dauer nach der Erfassung der zweiten bzw. der dritten Zustandsänderung.
  2. Überwachungseinrichtung nach Anspruch 1, bei der die Zeitgebervorrichtung die Messung jeder Dauer zwischen zweiten und dritten Zustandsänderungen und dritten und vierten Zustandsänderungen nach einer vorgegebenen Verzögerung beginnt.
  3. Überwachungseinrichtung nach Anspruch 1 oder 2, bei der die Zeitsignale hörbare Signale sind.
  4. Überwachungseinrichtung nach Anspruch 3, bei der die Zeitsignale eine regelmäßige Reihe aus kurzen Tönen oder Piepsern umfassen.
  5. Überwachungseinrichtung nach einem der vorangehenden Ansprüche mit einer Alarmeinheit, wobei das Ausgangssignal der Vergleichervorrichtung die Alarmeinheit deaktiviert.
  6. Überwachungseinrichtung nach Anspruch 5, bei der die Alarmeinheit bei einem der ersten und zweiten Zustände der Vorrichtung deaktiviert und bei dem anderen Zustand aktiviert wird, wenn kein Ausgangssignal von der Vergleichervorrichtung vorhanden ist.
  7. Überwachungseinrichtung nach Anspruch 5 oder 6 mit einem Sensor, der bei Aktivierung betriebsbereit ist, um ein Alarmsignal an die Alarmeinheit zu liefern, um ein Warnsignal zu erzeugen, wenn die Alarmeinheit enabelt ist.
  8. Überwachungseinrichtung nach Anspruch 7, bei der der Sensor eine Vibrationseinheit ist, die das Alarmsignal an die Alarmeinheit bei Bewegung der Vibrationseinheit abgeben kann.
  9. Überwachungseinrichung nach Anspruch 7 oder 8, bei der das Warnsignal ein hörbares Signal ist .
  10. Überwachungseinrichrung nach einem der vorangehenden Ansprüche, bei der die Vorrichtung eine elektrisch betriebene Vorrichtung ist und der erste und der zweite Zustand der Vorrichtung Einschalt- und Ausschalt-Zustände der Vorrichtung sind.
  11. Überwachungseinrichtung nach einem der vorangehenden Ansprüche, bei der die Eingabevorrichtung zwei Eingangsanschlüsse zum Anschließen elektrischer Leitungen der zu überwachenden elektrischen Vorrichtung aufweist
  12. Überwachungseinrichtung nach Anspruch 11, bei der die zwei Eingangsanschlüsse so konfiguriert sind, daß sie mit der Vorrichtung verbunden werden, um Spannungsänderungen zu erfassen.
  13. Überwachungseinrichtung nach Anspruch 11, bei der die zwei Eingangsanschlüsse so konfiguriert sind, daß sie mit der Vorrichtung verbunden werden, um Stromänderungen zu erfassen.
EP96901078A 1995-02-24 1996-01-30 Überwachungsvorrichtung Expired - Lifetime EP0811212B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GBGB9503737.0A GB9503737D0 (en) 1995-02-24 1995-02-24 A monitoring device
GB9503737 1995-02-24
GB9515441 1995-07-27
GB9515441A GB2298304B (en) 1995-02-24 1995-07-27 A monitoring device
PCT/GB1996/000196 WO1996026510A1 (en) 1995-02-24 1996-01-30 A monitoring device

Publications (2)

Publication Number Publication Date
EP0811212A1 EP0811212A1 (de) 1997-12-10
EP0811212B1 true EP0811212B1 (de) 1999-07-21

Family

ID=26306578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96901078A Expired - Lifetime EP0811212B1 (de) 1995-02-24 1996-01-30 Überwachungsvorrichtung

Country Status (4)

Country Link
EP (1) EP0811212B1 (de)
AU (1) AU4494596A (de)
DE (1) DE69603354T2 (de)
WO (1) WO1996026510A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2959521B2 (ja) * 1997-05-21 1999-10-06 日本電気株式会社 半導体装置の製造方法、リードフレーム
AU1526800A (en) * 1998-10-29 2000-05-22 David Paul Viranyi Alarm for electronic equipment
US6662023B1 (en) 2000-07-06 2003-12-09 Nokia Mobile Phones Ltd. Method and apparatus for controlling and securing mobile phones that are lost, stolen or misused

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4533016A (en) * 1983-10-14 1985-08-06 Phantom Systems, Inc. Antitheft ignition system and solenoid apparatus for use therewith
GB9214600D0 (en) * 1992-07-09 1992-08-19 Newcom Services Ltd Alarm circuit

Also Published As

Publication number Publication date
DE69603354T2 (de) 2000-01-20
EP0811212A1 (de) 1997-12-10
WO1996026510A1 (en) 1996-08-29
DE69603354D1 (de) 1999-08-26
AU4494596A (en) 1996-09-11

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