EP0933740B1 - Dispositif antivol à radiofréquence - Google Patents

Dispositif antivol à radiofréquence Download PDF

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Publication number
EP0933740B1
EP0933740B1 EP19990101906 EP99101906A EP0933740B1 EP 0933740 B1 EP0933740 B1 EP 0933740B1 EP 19990101906 EP19990101906 EP 19990101906 EP 99101906 A EP99101906 A EP 99101906A EP 0933740 B1 EP0933740 B1 EP 0933740B1
Authority
EP
European Patent Office
Prior art keywords
tag
circuit
drawer
signal
detection sensor
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
EP19990101906
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German (de)
English (en)
Other versions
EP0933740A2 (fr
EP0933740A3 (fr
Inventor
Tomohiro c/oMitsubishi Materials Co. Mori
Takanori c/oMitsubishi Materials Co. Endo
Kouichi c/oMitsubishi Materials Co. Ishiyama
Tadashi c/oMitsubishi Materials Co. Yonezawa
Masami c/oMitsubishi Materials Co. Miyake
Shigeyuki Osawa
Seiro c/o IP SERVICE CORPORATION Yahata
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.)
Mitsubishi Materials Corp
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Mitsubishi Materials Corp
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 JP01889598A external-priority patent/JP3266089B2/ja
Application filed by Mitsubishi Materials Corp filed Critical Mitsubishi Materials Corp
Publication of EP0933740A2 publication Critical patent/EP0933740A2/fr
Publication of EP0933740A3 publication Critical patent/EP0933740A3/fr
Application granted granted Critical
Publication of EP0933740B1 publication Critical patent/EP0933740B1/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
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2477—Antenna or antenna activator circuit
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/248—EAS system combined with another detection technology, e.g. dual EAS and video or other presence detection system

Definitions

  • the present invention relates to a radio wave type burglar detection apparatus having the features of the preamble of claim 1.
  • a burglar-alarm tag is disclosed in JP-A- 8-185584, the tag which is constructed such that a resonance circuit block of the tag attached to an object for monitoring a burglar resonates with a specific frequency from a radio wave transmission unit, separation detection means detects whether the tag is separated from the object for monitoring a burglar, and a separation information block controls warning sound outputs means on the basis of a detection output of this separation detection means.
  • the resonance circuit block is constructed with forming conductive metal foil, having a predetermined shape, by etching and the like in both sides of a thin film of an insulating dielectric. For example, a coil portion formed in a spiral shape with conductive metal foil, and a surface-side planer pattern of a capacitor, connected to the coil portion, in the central portion of the spiral of this coil portion are formed on the surface of the thin film.
  • a transmission antenna and a reception antenna are installed in a predetermined interval, and these antennas are electrically connected to a control block.
  • the control block is constructed such that the control block makes the transmission antenna transmit a radio wave having a frequency resonating in the resonance circuit block and always checks a signal level of a signal received from the reception antenna. Furthermore, a speaker sounding an alarm is connected to a control output terminal of the control block.
  • a radio wave transmitted from a transmission antenna resonates in a resonance circuit block of the tag attached to an object for monitoring a burglar if an object for monitoring a burglar passes between the transmission antenna and a reception antenna without payment.
  • the reception antenna receives an input signal whose reception level is modulated.
  • the control block sounds an alarm from a speaker and can check takeout of an unpaid product.
  • a tag is disabled by breaking a capacitor through applying a strong radio wave, or an alarm is disabled by temporarily stopping the alarm speaker.
  • the above burglar-alarm tag requires a transmission antenna and a reception antenna, which are comparatively large, so as to detect a burglar of a product with the tag. Therefore, this type of tag has a defect that a comparatively wide space is required as an installation space of these antennas.
  • the above burglar-alarm tag has a possibility of a malfunction in a location with plenty of electrical noise of a computer and the like
  • a central line of the helical coil portion extends in the direction orthogonal to a mounting surface of an object, and hence a radio wave transmitted from the resonance circuit block passes the object. Therefore, if this tag is attached on an object whose surface is made of conductive material such as aluminum or ferromagnetic material such as a steel sheet, self inductance of the coil portion changes. Hence, in comparison with a case that the tag is attached to an object whose surface is made of insulating-material or non-magnetic material, the tag has a possibility of not operating as a burglar-alarm tog due to an influence of a change of a resonance frequency in the resonance circuit block.
  • EAS electronic article surveillance system
  • a tag is attached to each article to be detected by means of a magnetic field (US-A-5 406 262).
  • This surveillance system requires much space and a large number of togs and is it not suitable to survey small space locations.
  • the object of the present invention is to provide a burglar detection apparatus for detecting presence and absence of an article placed at a comparatively small space such as in a cash register.
  • the apparatus of the present invention detects a burglar by detecting with using a radio wave whether a tag having a resonance circuit block is in a predetermined location and in particular detects presence and absence of a tag having a resonance circuit block placed at a comparatively small space such as a cash register of a retail store or the like.
  • the radio wave type burglar detection apparatus of the present invention can be installed in a comparatively small space, can prevent a malfunction even if the apparatus is installed in a location with plenty of electrical noise, and can surely detect the presence and absence of a tag even if the tag is placed in the vicinity of an object made of metal.
  • the radio wave type burglar detection apparatus of the present invention can increase a ratio (S/N ratio) between a signal transmitted by the tag detection sensor and a signal generated by electrical noise of a computer and the like by making a radio wave, which is transmitted by the tag detection sensor, have directivity.
  • Still another aspect of the present invention is a radio wave type burglar detection apparatus that can immediately detect abnormal operation caused by a failure and the like of a tag, a tag detection sensor, a drawer sensor, or an upper lid sensor, and hence can increase the reliability of the apparatus.
  • a radio wave type burglar detection apparatus as shown in Figures 1 and 3, comprises: a tag 11 having a resonance circuit block 12; a box 13 containing a drawer 14 where the tag 11 is contained with an object 15; a tag detection sensor 16 detecting whether the tag 11 is present within the drawer 14; a drawer sensor 17 detecting whether the drawer 14 is drawn; and a control circuit 19 controlling alarm means 18 on the basis of each detection output of the tag detection sensor 16 and drawer sensor 17.
  • the tag 11 is formed in the approximately same shape as that of the object 15 in this embodiment.
  • This tag 11 comprises: a base plate 11a made of insulating-material such as paper and a plastic thin sheet; a coil portion 11b that is made of conductive material such as copper and aluminum and is formed in a helical and approximately rectangular shape on the upper surface of this base plate 11a; a dielectric layer 11c that is made of insulating-material and is bonded to cover the upper surface of the base plate 11a through the coil potion 11b; and a surface layer 11d that is made of insulating-material and is bonded to cover the upper surface of the dielectric layer 11c.
  • a first electrode layer 11e and a first connecting terminal 11f that are made of conductive material and are electrically connected to an internal end and an external end of the coil portion 11b are bonded respectively.
  • the dielectric layer 11c is bonded to cover a part of the upper surface of the base plate 11a except the first connecting terminal 11f.
  • a second electrode layer 11g and a second connecting terminal 11h that are made of conductive material and face to the first electrode layer 11e and first connecting terminal 11f are bonded respectively.
  • the second electrode layer 11g and second connecting terminal 11h are electrically connected with each other.
  • the first and second connecting terminals 11f and 11h are electrically connected with each other when the surface layer 11d is laminated through the dielectric layer 11c on the base plate 11a.
  • a capacitor 11i is constructed with the first electrode layer 11e, first dielectric layer 11c, and second electrode layer 11g, and a resonance circuit block 12 is constructed with this capacitor 11i and coil portion 11b.
  • a resonance frequency of the resonance circuit block 12 is 7-9 MHz in this embodiment.
  • the box 13 is a safe where the drawer 14 is contained, and the object 15 is plenty of bank notes ( Figures 1 and 2).
  • the drawer 14 is partitioned into a document container 14c, which is in a near end, and bank note containers 14d and 14e, which are in a back end, with a first partition board 14a extending in the width direction.
  • the bank note container is partitioned into a pair of bank note containers 14d and 14e, which are partitioned into a left part and a right part, respectively, with a second partition board 14b extending in the drawing direction.
  • This drawer 14 is made of metal material such as a steel sheet, the tags 11 and 11 are contained in the pair of bank note containers 14d and 14e, respectively, and further, on these tags 11 and 11, plenty of bank notes 15 and 15 are piled respectively. In addition, soft magnetic members 22 and 22 are sandwiched between the tags 11 and 11, and the drawer 14.
  • a sintered ferrite, a compact of ferrite powder and binder, or composite material of soft magnetic metal powder as this soft magnetic member.
  • the binder polyester, nylon, polyvinyl chloride, synthetic rubber, natural rubber, and the like can be used.
  • composite material of soft magnetic metal powder composite material of carbonyl iron powder, permalloy powder by ball mill crushing, and the like, and resin such as polyester, nylon, polyvinyl chloride, synthetic rubber, and natural rubber can be used.
  • the purpose of inserting the soft magnetic member 22 between the tag 11 and drawer 14 is to make it possible that a magnetic field easily passes to the resonance circuit block of the tag 11 owing to the soft magnetic member 22, and hence, that the tag 11 is surely detected by the tag detection sensor 16 even if the drawer 14 is made of metal.
  • an opening 13a for drawing the drawer 14 is formed in the front panel of the safe 13, and this opening 13a is enabled to open and close by means of a front door 13b ( Figures 2A and 2B).
  • the tag detection sensor 16 comprises an antenna 23 attached on a back surface of an upper wall in the vicinity of the opening 13a of the safe 13, and a tag detection circuit 24 electrically connected to a coil 23b of this antenna 23 ( Figures 1, 2A, 2B, and 5).
  • the antenna 23 has a core 23a that is made of ferrite and extends in the width direction of the safe 13, a coil 23b wound around this core 23a, and a pair of arm sections 23c and 23d, which is made of ferrite and is provided in both ends of the core 23a with protruding toward two tags 11 and 11 respectively.
  • the core 23a including the coil 23b, and a base end of the pair of arm sections 23c and 23d are covered with the wave absorber 26 ( Figures and 5) and electromagnetic wave shielding member (not shown) through an insulator (not shown) such as a vinyl tape.
  • the wave absorber 26 Figures and 5
  • electromagnetic wave shielding member not shown
  • an insulator not shown
  • the periphery of a part of a core except a part of the core facing to the tag that is, both ends of the core can be covered with the coil through the insulator with the wave absorber and electromagnetic wave shielding member.
  • a part of the core not facing to the tag can be covered with the coil through the insulator with the wave absorber and electromagnetic wave shielding member.
  • the wave absorber 26 is a nonwoven fabric type wave absorber, and a wave absorber is used, the wave absorber which is a wave absorber comprising a nonwoven fabric composed of first fibers which are covered by oxidized metal and second fibers that is an insulator and is not covered by metal.
  • a wave absorber composed of laminated nonwoven fabric sheets composed of the first fibers and second fibers is used.
  • a wave absorber comprising a nonwoven fabric composed of a plurality of laminated layers composed of at least one layer of nonwoven fabric containing oxidized metal-coated fibers and one layer of nonwoven fabric containing non-oxidized metal-coated fibers is also used, the nonwoven fabric having a layer containing the oxidized metal-coated fibers which is located in the injection surface side of a radio wave.
  • metal coating the fibers and being oxidized one or two kinds of metal, alloys, or the like that are selected from a group of silver, copper, nickel, and zinc are used.
  • a wave absorber comprising a nonwoven fabric composed of first fibers, which is coated with metal that is sulfided, and second fibers, which is an insulator and is not coated with metal, can be used. Furthermore, a wave absorber comprising a plurality of laminated nonwoven fabric sheets composed of the first and second fibers can be also used.
  • a wave absorber comprising a nonwoven fabric composed of a plurality of laminated layers composed of at least one layer of nonwoven fabric containing sulfided metal-coated fibers and one layer of nonwoven fabric containing non-sulfided metal-coated fibers can be also used, the nonwoven fabric having a layer containing the sulfided metal-coated fibers which is located in the injection surface side of a radio wave.
  • metal coating the fibers and being sulfided copper, a copper alloy, silver or a silver alloy is used.
  • an electromagnetic wave shielding member a nonwoven fabric comprising organic fibers coated with silver, a nonwoven fabric comprising a mixture of organic fibers and organic fibers coated with silver, or a laminated body comprising nonwoven fabrics comprising organic fibers and organic fibers coated with silver.
  • Natural and synthetic organic fibers such as cotton, linen, regenerated cellulose, polyamide, acrylic fibers, polyolefine, polyester, and the like are used as the organic fibers.
  • the purpose of coating the core 23a, including the coil 23b, and the pair of arm sections 23c and 23d with the wave absorber 26 and electromagnetic wave shielding member is to make it possible that electrical noise of a computer and the like is absorbed by the wave absorber 26 and is blocked from incidence into the core 23a of the antenna 23 by shutting off with the electromagnetic wave shielding member, and hence that a radio wave type burglar detection apparatus is prevented from malfunctioning.
  • the purpose of providing the pair of arm sections 23c and 23d in both sides of the core 23a with protruding is to increase a ratio (S/N ratio) between a signal transmitted from the arm sections 23c and 23d and a signal generated by electrical noise of a computer and the like by a radio wave, transmitted from the pair of arm sections 23c and 23d, proceeding toward the tags 11 and 11, that is, making the radio wave have directivity.
  • the tag detection circuit 24, as shown in Figure 5, comprises: a voltage-controlled oscillator 24a that is electrically connected to the coil 23b of the antenna 23 and feeds a current, having the same frequency as a resonance frequency of the tag 11, through the coil 23b; a sweep block 24b sweeping the oscillating frequency of this oscillator 24a within the range of 7-9 MHz; an amplifier 24c whose input terminal is connected to the output terminal of an automatic gain controller in the voltage-controlled oscillator 24a; a noise filter 24d whose input terminal is connected to the output terminal of the amplifier 24c; and a threshold circuit 24e whose input terminal is connected to the output of the noise filter 24d.
  • This tag detection circuit 24 is constructed so that, when the resonance circuit block 12 resonates by the tag 11 accessing the coil 23b, a specific signal may appear at the output terminal of the automatic gain controller of the voltage-controlled oscillator 24a.
  • This specific signal is amplified by the amplifier 24c, a noise signal mixed in this signal is filtered by the noise filter 24d, and further the signal is selected by the threshold circuit 24e. If a waveform of the specific signal is not present in a waveform selected by the threshold circuit 24e, the threshold circuit 24e outputs the ON signal "1". In addition, if a waveform of the specific signal is present in a waveform selected by the threshold circuit 24e, the threshold circuit 24e outputs the OFF signal "0".
  • the drawer sensor 17 is a reed switch ( Figures 1 and 2) attached to one internal surface of a side wall in the vicinity of the opening 13a of the safe 13.
  • a magnet 27 is attached to an external surface of a side wall in the vicinity of the back end of the drawer 14. If the drawer 14 is contained in the safe 13, the magnet 27 is separated from the reed switch 17, and hence the reed switch outputs the signal "0" with keeping the OFF state. If the drawer 14 is drawn, the magnet 27 accesses the reed switch 17, and hence the reed switch outputs the signal "1" with turning on.
  • One terminal of this reed switch 17 is connected to a power supply 28, and another terminal is connected to a control input terminal of an AND circuit 19, which is a control circuit, with the output terminal of the threshold circuit 24e ( Figures 1 and 5).
  • a first buzzer 18, which is alarm means, is connected to the control output terminal of the AND circuit 19 ( Figure 1).
  • the AND circuit 19 activates the first buzzer 18 only when the reed switch 17 outputs the signal "1" because of the drawer 17 being drawn and the threshold circuit 24e outputs the signal "1" because of the tag 11 not being present within the drawer 14.
  • a time constant circuit 29, which is composed of a resistor 29a and a capacitor 29b, is connected between the AND circuit 19 and first buzzer 18.
  • the time constant circuit 29 prevents the first buzzer 18 from malfunctioning. In particular, this is effective to a case that chattering arises at the output terminal of the threshold circuit 24e due to electrical noise that is caused by a cellular phone and the like and is not continuous but intermittent.
  • the tag detection circuit 24, power supply 28, AND circuit 19, first buzzer 18, and time constant circuit 29 are contained in a case 31 attached to the external surface of a side wall of the safe 13 ( Figures 1 and 2).
  • the magnet 27 accesses the reed switch 17, and hence the reed switch 17 outputs the signal "1" owing to the magnetic intensity of the magnet 27 ( Figure 1). Nevertheless, since the tag 11 faces to the antenna 23, the tag detection sensor 16 detects the two tags 11 and 11, and hence the threshold circuit 24e outputs the signal "0". In consequence, the AND circuit 19 does not activate the first buzzer 18 on the basis of respective detection outputs of the reed switch 17 and tag detection sensor 16.
  • the tag detection sensor 16 continues to detect another residual tag 11, and hence the threshold circuit 24e continues to output the signal "0".
  • the AND circuit 19 does not activate the first buzzer 18 on the basis of respective detection outputs of the reed switch 17 and tag detection sensor 16. This is because it is considered that an owner of the safe 13 counts the bank notes 15 in the safe 13.
  • the tag detection sensor 16 detects that the tags 11 and 11 are not present in the drawer 14, and hence the threshold circuit 24e outputs the signal "1".
  • the AND circuit 19 activates the first buzzer 18 on the basis of respective detection outputs of the reed switch 17 and tag detection sensor 16. Therefore, an owner of the safe 13 can immediately know that the bank notes 15 in the safe 13 are taken out without notice by an alarm sounded by the first buzzer 18, and hence can instantly report the incident to the police.
  • Figure 6 shows a second embodiment of the present invention.
  • the same symbols are assigned to the same components as those in Figure 1.
  • the power supply 28 is connected in series to the tag detection circuit 24 through the reed switch 17, and this series circuit constructs a control circuit 49. Except the above construction this embodiment has the same construction as the first embodiment has.
  • Figures 7 and 8 show a third embodiment of the present invention.
  • the same symbols are assigned to the same components as those in Figures 1 and 2.
  • an opening 63a is provided in the upper side of the safe 63 made of metal material, and an upper lid 63b that can open and close the opening 63a is installed in the upper surface of this safe 63. Furthermore, a loop antenna 73 that is circular or square and consists of a plurality of turns of wire is used as an antenna of a tag detection sensor 66.
  • a soft magnetic member 72 made of the same material as that of the soft magnetic member 22 in the first embodiment is placed, and two tags 11 and 11 are placed in parallel to each other on this soft magnetic member 72. Thus, the soft magnetic member 72 is sandwiched between the tags 11 and 11, and the safe 63. In addition, on these tags 11 and 11, plenty of bank notes 15 and 15 are piled respectively.
  • the loop antenna 73 is placed to become above between the two tags 11 and 11 in the safe 63, and both ends of this antenna 73 are electrically connected to the tag detection circuit 24.
  • the surface of the loop antenna 73 not facing to the tags 11 and 11 is covered by a wave absorber 76 and an electromagnetic wave shielding member (not shown) through an insulator (not shown).
  • an upper lid sensor 67 is mounted to the inside of a side wall in the vicinity of the opening 63a of the safe 63.
  • This sensor 67 is a micro switch, which outputs the signal "0" with turning off at the time of closing the upper lid 63b, and which outputs the signal "1" with turning on at the time of opening the upper lid 63b.
  • the AND circuit 19, which is a control circuit, activates the first buzzer 18 only when the micro switch 67 outputs the signal "1" because of the upper lid 63b being opened and a threshold circuit (not shown) in the tag detection circuit 24 outputs an ON signal "1" because of the tag 11 not being present within the safe 63.
  • the tag detection circuit 24, power supply 28, AND circuit 19, first buzzer 18, and time constant circuit 29 are contained in a case 81 mounted to the external surface of a back wall of the safe 63. The construction of this embodiment except the above construction is the same as that of the first embodiment.
  • the tag detection sensor 66 continues to detect another residual tag 11 in the safe 63, and hence the tag detection circuit 24 continues to output the signal "0". In consequence, the AND circuit 19 does not activate the first buzzer 18. Furthermore, if all of the tags 11 and 11 are taken out with the bank notes 15 and 15 from the safe 63 in the state of the upper lid being opened (the micro switch 67 outputting the signal "1"), the tag detection sensor 66 detects that the tags 11 and 11 are not present in the safe 63, and hence the tag detection circuit 24 outputs the signal "1". Hence, the AND circuit 19 activates the first buzzer 18. In consequence, an owner of the safe 63 can immediately know that the bank notes 15 in the safe 63 are taken out without notice by an alarm sounded by the first buzzer 18, and hence can instantly report the incident to the police.
  • Figure 9 shows a fourth embodiment of the present invention.
  • the same symbols are assigned to the same components as those in Figure 1.
  • This embodiment comprises a self operation management circuit 811 detecting abnormal operation of the tag 11, tag detection sensor 16 or reed switch 17.
  • This self operation management circuit 811 has an exclusive OR circuit 82 and an inverting circuit 83.
  • a first input terminal 82a out of two input terminals 82a and 82b of the exclusive OR circuit 82 is connected to the output side of the tag detection circuit 24, and a second input terminal 82b is connected to the ground side of the reed switch 17 respectively.
  • the inverting circuit 83 is connected between the first input terminal 82a and tag detection circuit 24.
  • the output terminal 82c of the exclusive OR circuit 82 is connected to a second buzzer 86, which is information means, through a time constant circuit 84.
  • the exclusive OR circuit 82 If ON signals "1” or OFF signals "0" are inputted to all of the first and second input terminals 82a and 82b of the exclusive OR circuit 82, the exclusive OR circuit 82 outputs the signal “0". If the signal “0" is inputted to either of the first or second input terminal 82a or 82b and the signal "1" is inputted to the other terminal, the exclusive OR circuit 82 outputs the signal "1".
  • the exclusive OR circuit 82 has the input and output relation shown in Table 1. 1st Input 2nd Input Output 0 0 0 0 0 1 1 1 0 1 1 1 0
  • the inverting circuit 83 If the signal "0" is inputted, the inverting circuit 83 outputs the signal “1", and if the signal "1" is inputted, the inverting circuit 83 outputs the signal "0".
  • the second buzzer 86 is constructed to have a tone different from that of the first buzzer 18 that is the alarm means. The buzzer 86 is not activated if the exclusive OR circuit 82 outputs the signal "0", and is activated if outputting the signal "1".
  • a lamp and the like can be used instead of the buzzer.
  • the time constant circuit 84 consists of a resistor 84a and a capacitor 84b, and absorbs a time lag between the tag detection circuit 24 and reed switch 17.
  • the second buzzer 86 is not activated owing to the time constant circuit 84.
  • the time constant circuit 84 has a function of preventing the second buzzer 86 from being activated when external noise that is intermittent is received.
  • the tag detection sensor 16 cannot detect the tag 11, and hence the tag detection circuit 24 outputs the ON signal "1".
  • This ON signal "1" from the tag detection circuit 24 is inverted by the inverting circuit 83 and is outputted to the first input terminal 82a of the exclusive OR circuit 82.
  • the reed switch 17 is turned off because the reed switch 17 is separated from the magnet 27, and hence the OFF signal "0" is outputted to the second input terminal 82b of the exclusive OR circuit 82.
  • the exclusive OR circuit 82 outputs the signal "0” to the second buzzer 86, and hence the second buzzer 86 is not activated.
  • the first buzzer 18 is not activated.
  • the tag detection sensor 16 does not detect the tag 11 because the tag 11 does not face to the antenna 23, and hence the tag detection circuit 24 outputs the ON signal "1".
  • This output "1" from the tag detection circuit 24 is inverted into the signal "0" by the inverting circuit 83 to be outputted to the first input terminal 82a of the exclusive OR circuit 82.
  • the reed switch 17 keeps the state of accessing the magnet 27, the reed switch 17 outputs the ON signal "1" to the second input terminal 82b of the exclusive OR circuit 82.
  • a tag detection sensor 16 abnormally operates due to abnormal oscillation of a voltage-controlled oscillator (not shown), abnormal operation of an amplifier (not shown), or a failure or disconnection of a wire of another part constructing the tag detection sensor 16. Therefore, in spite of the tag 11 not facing to the antenna 23, the tag detection circuit 24 outputs the OFF signal "0" as if the tag detection sensor 16 detected the tag 11. This output "0" from the tag detection circuit 24 is inverted into the signal "1" by the inverting circuit 83 to be inputted to the first input terminal 82a of the exclusive OR circuit 82.
  • the reed switch 17 since the normal reed switch 17 is turned off because the reed switch 17 is separated from the magnet 27, the reed switch 17 outputs the signal "0" to the second input terminal 82b of the exclusive OR circuit 82. In consequence, since the exclusive OR circuit 82 outputs the signal "1" to the second buzzer 86, the second buzzer 86 is activated in a tone different from that of the first buzzer 18. At this time, since the output of the tag detection circuit 24 is the signal "0" and the output of the reed switch 17 is the signal "0", the first buzzer 18 is not activated.
  • the tag detection sensor 16 abnormally operates and the tag detection circuit 24 outputs the signal "1", which is the signal showing absence of the tag 11, in spite of the tag 11 facing to the antenna 23.
  • This output "1" from the tag detection circuit 24 is inverted into the signal "0" by the inverting circuit 83 to be inputted to the first input terminal 82a of the exclusive OR circuit 82.
  • the normal reed switch 17 since the normal reed switch 17 is turned on because the magnet 27 accesses the reed switch 17, the reed switch 17 outputs the signal "1" to the second input terminal 82b of the exclusive OR circuit 82.
  • the tag detection sensor 16 Since the tag 11 does not face to the antenna 23 if the drawer 14 is contained in the safe 13, the tag detection sensor 16 cannot detect the tag 11, and hence the tag detection circuit 24 outputs the ON signal "1".
  • This ON signal "1" from the tag detection circuit 24 is inverted into the signal "0" by the inverting circuit 83 and is outputted to the first input terminal 82a of the exclusive OR circuit 82.
  • the reed switch 17, which abnormally operates due to a contact failure, a short-circuit of wiring, and the like, is turned on in spite of the magnet 27 being separated from the reed switch 17. Hence, the OFF signal "0" is outputted to the second input terminal 82b of the exclusive OR circuit 82.
  • the exclusive OR circuit 82 outputs the signal "1" to the second buzzer 86, and hence the second buzzer 86 is activated.
  • the first buzzer 18 is activated.
  • the first and second buzzer 18 and 86 are activated in the state of the drawer 14 being contained in the safe 13, it is possible to judge that the reed switch 17 is failed.
  • the tag detection circuit 24 outputs the ON signal "1".
  • This ON signal "1" from the tag detection circuit 24 is inverted into the signal "0" by the inverting circuit 83 and is outputted to the first input terminal 82a of the exclusive OR circuit 82.
  • the normal reed switch 17 is turned off since the magnet 27 is separated from the reed switch 17, and hence, the OFF signal "0" is outputted to the second input terminal 82b of the exclusive OR circuit 82.
  • the exclusive OR circuit 82 outputs the signal "0" to the second buzzer 86, and hence the second buzzer 86 is not activated.
  • the output of the tag detection circuit 24 is the signal "1" and the output of the reed switch 17 is the signal "0”, the first buzzer 18 is not activated.
  • the first buzzer 18 is activated. Nevertheless, although the first and second buzzers 18 and 86 are activated in the state of the drawer 14 being drawn from the safe 13, the tag 11 is present in the drawer 14, and hence it is possible to judge that the tag 11 is failed.
  • the self operation management circuit 811 immediately detects this abnormal operation and activates the second buzzer 86. Therefore, an owner of the safe 13 can instantly know the failure of the radio wave type burglar detection apparatus. Hence, since it is possible to repair or replace this apparatus failed or malfunctioned, it is possible to increase the reliability of the radio wave type burglar detection apparatus of the present invention.
  • the output of the self operation management circuit 811 with the output of the AND circuit 19 (control circuit) to a security guard company or the like, personnel of the security guard company or the like, which receives the alarm, go to the location, and can judge whether the alarm is an alarm or a failure.
  • Figure 10 shows a fifth embodiment of the present invention.
  • the same symbols of Figure 7 are assigned to the same components.
  • This embodiment comprises a self operation management circuit 91 detecting abnormal operation of the tag 11 or tag detection sensor 66.
  • This self operation management circuit 91 is a branch circuit branching from the output side of the tag detection circuit 24.
  • the second buzzer 86 that is information means is connected to this branch circuit 91 through the time constant circuit 84 composed of the resistor 84a and capacitor 84b.
  • the time constant circuit 84 has a function of preventing the second buzzer 86 from being activated when receiving intermittent external noise.
  • a lamp or the like can be used as information means instead of the buzzer.
  • the construction except the above construction is the same as that of the third embodiment.
  • the self operation management circuit 91 does not activate the second buzzer 86.
  • the output of the tag detection circuit 24 is the signal "0" and the output of the micro switch 67 is the signal "0"
  • the first buzzer 18 is not activated.
  • the tag detection circuit 24 outputs the OFF signal "0". In consequence, the self operation management circuit 91 does not activate the second buzzer 86. At this time, since the output of the tag detection circuit 24 is the signal "0" and the output of the micro switch 67 is the signal "1", the first buzzer 18 is not activated.
  • the tag detection circuit 24 outputs the ON signal "1"
  • the self operation management circuit 91 activates the second buzzer 86 in a tone different from that of the first buzzer 18.
  • the output of the tag detection circuit 24 is the signal "1”
  • the output of the micro switch 67 is the signal "1”
  • the first buzzer 18 is activated.
  • the bank notes 15 in the safe 63 are taken out with the tag 11 without notice, not only the first buzzer 18 but also the second buzzer 86 are activated. Nevertheless, since the tag 11 is taken out with the bank notes 15 from the safe 63, it is possible to judge that the bank notes 15 are taken out without notice.
  • a tag detection sensor 66 abnormally operates due to abnormal oscillation of a voltage-controlled oscillator (not shown), abnormal operation of an amplifier (not shown), or a failure or disconnection of a wire of another part constructing the tag detection sensor 66. Therefore, in spite of the tag 11 facing to the loop antenna 73, the tag detection circuit 24 outputs the ON signal "1" as if the tag detection sensor 66 did not detect the tag 11. Hence, the self operation management circuit 91 activates the second buzzer 86. At this time, since the output of the tag detection circuit 24 is the signal "1" and the output of the micro switch 67 is the signal "0", the first buzzer 18 is not activated.
  • the tag detection sensor 66 outputs the signal "1", which shows that the tag 11 is not detected, in spite of the tag 11 facing to the loop antenna 73.
  • the self operation management circuit 91 activates the second buzzer 86.
  • the output of the tag detection circuit 24 is the signal "1” and the output of the micro switch 67 is the signal "1"
  • the first buzzer 18 is activated.
  • the self operation management circuit 91 activates the second buzzer 86. At this time, since the output of the tag detection circuit 24 is the signal "1" and the output of the micro switch 67 is the signal "0", the first buzzer 18 is not activated.
  • the tag detection circuit 24 outputs the signal "1" in spite of the tag 11, similarly to the above, facing to the loop antenna 73. Hence, the self operation management circuit 91 activates the second buzzer 86. At this time, since the output of the tag detection circuit 24 is the signal "1" and the output of the micro switch 67 is the signal "1", the first buzzer 18 is activated.
  • the self operation management circuit 91 immediately detects this abnormal operation and activates the second buzzer 86. Therefore, an owner of the safe 63 can instantly know the failure of the radio wave type burglar detection apparatus. Hence, since it is possible to repair or replace this apparatus failed or malfunctioned, it is possible to increase the reliability of the radio wave type burglar detection apparatus of the present invention.
  • the output of the self operation management circuit 91 with the output of the AND circuit 19 (control circuit) to a security guard company or the like, personnel of the security guard company or the like, which receives the alarm, go to the location, and can judge whether the alarm is an alarm or a failure.
  • a safe is cited as a box in the first through fifth embodiments
  • a show window case for displaying precious metal a cash register that is a terminal of a POS (Point Of Sales) system, and the like also can be used as the box.
  • a buzzer is cited as alarm means in the first through third embodiments, a lamp or other alarm means also can be used, and this alarm means can be installed in a security guard company and the like. In this case, since the security guard company and the like can immediately know a burglar and the like of bank notes from a safe, the company can correspond to this matter immediately.
  • a first buzzer is cited as alarm means and a second buzzer is cited as information means in the fourth and fifth embodiments
  • a lamp and other alarm means can be used as the alarm means and a lamp and other information means can be used as the information means.
  • tags are contained in a drawer or a box in the first through fifth embodiments, one or three tags also can be contained. If three or more tags are contained, it is necessary to extend an antenna without using a pair of arm sections in the first, second, and fourth embodiments. Nevertheless, since the antenna in the third embodiment is a loop antenna, all tags can be detected without extending the antenna.
  • a core or a loop antenna of a tag detection sensor are covered with both of a wave absorber and an electromagnetic wave shielding member in the first through fifth embodiments, either of the wave absorber or electromagnetic wave shielding member can be used for covering.
  • a loop antenna can be used as the antenna in the first and second embodiments, and a core where a coil is wound can be used as the antenna in the third embodiment.
  • the self operation management circuit cited in the fourth embodiment can be provided in the radio wave type burglar detection apparatus according to the second embodiment.
  • a radio wave type burglar detection apparatus has such a construction that a tag having a resonance circuit block is placed with an object in a predetermined location, a tag detection sensor that is installed near the tag placed in this predetermined location detects whether the tag is present in the predetermined place, and a control circuit controls alarm means on the basis of the detection output of this sensor.
  • the control circuit does not activate the alarm means on the basis of the detection output of the tag detection sensor. If the tag is taken out with the object from the predetermined location, the control circuit activates the alarm means on the basis of the detection output of the tag detection sensor. In consequence, it is possible to surely detect whether the tag is present in the predetermined location.
  • the drawer sensor detects that the drawer is not drawn regardless of the tag being present in the drawer if the box contains the drawer. Hence, the control circuit does not activate the alarm means. Furthermore, if the drawer is drawn from the box, the drawer sensor detects that the drawer is drawn, and the tag detection sensor detects that the tag is present in the drawer. Therefore, the control circuit does not activate the alarm means.
  • the tag detection sensor detects that the tag is absent in the drawer.
  • the control circuit activates the alarm means. In consequence, it is possible to surely detect whether the tag is taken out from the drawer.
  • the upper lid sensor detects regardless of presence or absence of the tag in the box that the upper lid is not opened if the upper lid is closed. Therefore, the control circuit does not activate the alarm means. Moreover, if the upper lid is opened, the upper lid sensor detects that the upper lid is opened, and the tag detection sensor detects that the tag is present in the box. Hence, the control circuit does not activate the alarm means.
  • the tag detection sensor detects that the tag is absent in the box, and hence the control circuit activates the alarm means. In consequence, it is possible to surely detect whether the tag is taken out from the box.
  • the tag is always taken out from the predetermined location or from the drawer or box if the object is taken out from the predetermined location or from the drawer or box. Therefore, it is possible to surely detect a burglar of the object.
  • a magnetic field easily passes to the resonance circuit block of the tag by means of a soft magnetic member by sandwiching a soft magnetic member made of a sintered ferrite, a compact of ferrite powder and binder, or composite material of soft magnetic metal powder between the tag and drawer or box. Therefore, even if the drawer or box is made of metal material, it is possible to surely detect the tag by the tag detection sensor.
  • the self operation management circuit by detecting the abnormal operation of a tag, a tag detection sensor, a drawer sensor, or an upper lid sensor by a self operation management circuit, the self operation management circuit immediately detects the abnormal operation if the tag or the like abnormally operates due to a failure or the like. Therefore, it is possible to rapidly repair or replace the tag or the like that abnormally operates. In consequence, it is possible to increase the reliability of the radio wave type burglar detection apparatus of the present invention.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Burglar Alarm Systems (AREA)

Claims (8)

  1. Dispositif antivol à radiofréquence comprenant une étiquette (11), un bloc de circuit de résonance (12), un palpeur de détection d'étiquette (16; 66) et un circuit de commande (19), qui commande des moyens d'alarme (18) sur la base d'une sortie de détection du palpeur de détection d'étiquette (16; 66), l'étiquette (11) et le bloc de circuit de résonance (12) étant placés ensemble avec un objet (15) à un endroit prédéterminé (13 ; 63), où le palpeur de détection d'étiquette à radiofréquence (16 ; 66) est installé pour détecter si l'étiquette (11) et l'objet (15) sont présents à l'endroit prédéterminé (13 ; 63), caractérisé en ce que
    a) l'endroit prédéterminé (13) où l'étiquette (11) comprenant un bloc de circuit de résonance (12) est installée, est un boítier (13) comprenant un tiroir (14), dans lequel l'étiquette (11) est contenue avec un objet (15), le palpeur de détection d'étiquette (16) étant installé dans le boítier (13) pour détecter si l'étiquette (11) est présente dans le tiroir (14), un détecteur de tiroir (17) détectant si le tiroir (14) est tiré et le circuit de commande (19) commandant les moyens d'alarme (18) sur la base de chaque sortie de détection du palpeur de détection d'étiquette (16) et du détecteur de tiroir (17),
    b) l'endroit prédéterminé où l'étiquette (11) comprenant un bloc de circuit de résonance (12) est installée, est un boítier (63) qui contient l'étiquette (11) avec un objet (15) et qui comprend un couvercle supérieur (63b) qu'on peut ouvrir et fermer, le palpeur de détection d'étiquette (66) étant installé dans le boítier (63) pour détecter si l'étiquette (11) est présente dans le boítier (63), un détecteur de couvercle supérieur (67) détectant si le couvercle supérieur (63b) est ouvert ou fermé, le circuit de commande (19) commandant les moyens d'alarme (18) sur la base de chaque sortie de détection du palpeur de détection d'étiquette (66) et du détecteur de couvercle supérieur (67).
  2. Dispositif selon la revendication 1, dans lequel l'étiquette (11) est placée avec l'objet (15) en une seule pièce à l'endroit prédéterminé (13 ; 63).
  3. Dispositif selon la revendication 1 ou 2, dans lequel le tiroir (14) ou le boítier (63) est composé d'un matériel métallique et un élément magnétique doux (22 ; 72) est pris en sandwich entre l'étiquette (11) et le tiroir (14) ou le boítier (63).
  4. Dispositif selon la revendication 3, dans lequel l'élément magnétique doux (22 ; 72) est composé de ferrite fritté, d'un compact de poudre de ferrite et de liant, ou d'un matériau composite de poudre de métal magnétique doux.
  5. Dispositif selon l'une quelconque des revendications 1 à 4, dans lequel le palpeur de détection d'étiquette (16) a un noyau de ferrite (23a), autour duquel une bobine est enroulée, et au moins une partie du noyau (23a), qui ne se trouve pas en face de l'étiquette (11), est couverte avec la bobine (23b) par l'un ou l'autre d'un absorbeur d'ondes (26) ou d'un élément de blindage d'ondes électromagnétiques ou par les deux.
  6. Dispositif selon la revendication 5, dans lequel une paire de sections de bras (23c, 23d) réalisées en ferrite est prévue aux deux extrémités du noyau (23a) de manière qu'elles font saillie vers l'étiquette (11).
  7. Dispositif selon l'une quelconque des revendications 1 à 6, dans lequel le palpeur de détection d'étiquette (66) comprend une antenne cadre (73), et une surface de l'antenne cadre (73), qui ne se trouve pas en face de l'étiquette (11), est couverte par l'un ou l'autre d'un absorbeur d'ondes (26) ou d'un élément de blindage d'ondes électromagnétiques ou par les deux.
  8. Dispositif selon l'une quelconque des revendications 1 à 7, dans lequel un circuit d'administration automatique (81 ; 91), qui détecte un fonctionnement anormal d'une étiquette (11), du palpeur de détection d'étiquette (16 ; 66) ou du détecteur de tiroir (17), est prévu.
EP19990101906 1998-01-30 1999-01-29 Dispositif antivol à radiofréquence Expired - Lifetime EP0933740B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP01889598A JP3266089B2 (ja) 1997-12-25 1998-01-30 電波式盗難検出装置
JP1889598 1998-01-30

Publications (3)

Publication Number Publication Date
EP0933740A2 EP0933740A2 (fr) 1999-08-04
EP0933740A3 EP0933740A3 (fr) 1999-12-22
EP0933740B1 true EP0933740B1 (fr) 2005-10-19

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Application Number Title Priority Date Filing Date
EP19990101906 Expired - Lifetime EP0933740B1 (fr) 1998-01-30 1999-01-29 Dispositif antivol à radiofréquence

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Country Link
EP (1) EP0933740B1 (fr)
DE (1) DE69927726T2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10107319A1 (de) * 2000-02-18 2002-01-31 Aisin Seiki Rahmenantennenvorrichtung
FR2821809A1 (fr) 2001-03-09 2002-09-13 Bressane De Travaux Electr Bte Systeme d'alarme pour vehicule automobile
GB2445296B (en) * 2005-02-27 2008-09-17 John Philip Griffits System to electronically monitor luggage contents

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828341A (en) * 1972-01-20 1974-08-06 Ici America Inc Alarm apparatus for facilitating the detection of an unauthorized removal of property
US3938044A (en) * 1973-11-14 1976-02-10 Lichtblau G J Antenna apparatus for an electronic security system
GB8904690D0 (en) * 1989-03-01 1989-04-12 Marconi Electronic Devices Electronic monitoring arrangement
US5406262A (en) * 1993-06-16 1995-04-11 Security Tag Systems, Inc. Adjusting magnetic bias field intensity in EAS presence detection system to enhance detection

Also Published As

Publication number Publication date
DE69927726D1 (de) 2005-11-24
EP0933740A2 (fr) 1999-08-04
DE69927726T2 (de) 2006-07-06
EP0933740A3 (fr) 1999-12-22

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