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System for the registration of the passage of articles through a previously determined field

Info

Publication number
WO1980000386A1
WO1980000386A1 PCT/DK1979/000023 DK7900023W WO1980000386A1 WO 1980000386 A1 WO1980000386 A1 WO 1980000386A1 DK 7900023 W DK7900023 W DK 7900023W WO 1980000386 A1 WO1980000386 A1 WO 1980000386A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
marker
system
transmitter
aerial
frequency
Prior art date
Application number
PCT/DK1979/000023
Other languages
French (fr)
Inventor
J Knutzen
A Paladini
Original Assignee
Security Prod Int
J Knutzen
A Paladini
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

Links

Classifications

    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/22Electrical actuation
    • G08B13/24Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402Electronic 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
    • G08B13/2405Electronic 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 characterised by the tag technology used
    • G08B13/2414Electronic 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 characterised by the tag technology used using inductive tags
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G1/00Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
    • C10G1/04Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal by extraction
    • C10G1/045Separation of insoluble materials
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/22Electrical actuation
    • G08B13/24Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402Electronic 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
    • G08B13/2465Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468Antenna in system and the related signal processing
    • G08B13/2471Antenna signal processing by receiver or emitter
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/22Electrical actuation
    • G08B13/24Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402Electronic 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
    • G08B13/2465Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468Antenna in system and the related signal processing
    • G08B13/2474Antenna or antenna activator geometry, arrangement or layout

Abstract

In a system for the registration of the passage of articles through a previously determined field the transmitter (2) and the receiver (3, 4) are connected to a common aerial (1). A marker (18) on the articles receives and transmits electro-magnetic signals by the passage of a transmitter-and receiver bracket. In order to achieve the greatest possible security from incorrect registration the transmittance-and receiving function changes at a suitably high frequency, and an analytical circuit (7) monitors the number of received signals from the marker (18), and compares the frequency of these to that of the signals which are transmitted by the transmitter (2). The marker (18) consists of an inductive and a capacitive component, and the aerial (1) is shaped like a figure eight.

Description

SYSTEM FOR THE REGISTRATION OF THE PASSAGE OF ARTICLES THROUGH A PREVIOUSLY DETERMINED FIELD

The invention relates to a system for the registration of the passage of articles through a priorly determined field of the kind that comprises a transmitter and a receiver with a common aerial for alternately transmittance and receiving as well as a marker fastened to the articles for receiving and transmittance of signals by the passage of a transmitter- and receiver bracket or -brackets.

Systems of the kind that is mentioned in the introduction are already known. They are, however, all complicated and expensive, sensitive to electric noise, which leads to false alarm, and they are difficult to set up, as experts are required to secure that the function is reliable enough.

Prom the specification to US Patent No. 3.500.373 a system is known which comprises a common aerial for the transmitter and the receiver as well as a marker, which consists of a tuned circuit. The transmitter transmits during each trans¬ mittance period a continuous, cyclically alternating fre¬ quency, and the registration of the marker passage takes place according to the grid-dip meter principle, as the resonant frequency of the marker is preferably in the middle of the frequency field of the transmitter. This system is rather complicated and vulnerable, because any energy absorb- tion will result in alarm. The aerial is also complicated, because it composed of three coils, which are placed round the passage that is to be controlled, and in such a way that they are at three planes, which are at right angles to each other.

The purpose of the invention is to provide a system for the registration of unauthorized taking of articles and the like, which system is simply built up by few components and consequently cheap, which is easily set up by non-experts which is insensitive to electromagnetic distant fields a energy absorbing articles, and which is reliable so that false alarm can be excluded. This purpose is fulfilled b the fact that the transmittance and receiving function changes at a suitably high frequency, that the transmitt signals have a constant frequency during the complete transmittance period, that an analytical circuit monitor the number of received signals from the marker, and com¬ pares the frequency of these to that of the signals whic are transmitted by the transmitter, and that the marker consists of a tuned circuit, i.e. of an inductive and a capacitive component.

By means of this a quite unknown security against false is achieved. This claim, which must be fulfilled out of consideration for customers or visitors to shops or muse is not fulfilled by the known systems. This security is achieved by the fact that the analytical circuit firstly tors, whether a received signal has the same frequency a the signal that has just been transmitted, and secondly ther such a signal with the right frequency is received earlier fixed and large amount of times in an uninterrup ed succession.

Finally, according to claim 2, the system can be charact zed in that the transmitter- and receiver aerial is shap like a figure eight or a double loop.

By this you primarily achieve that distant fields can no be registered by the system, and secondly that the trans¬ mitted electromagnetic field gets a ring-shaped extensio which causes that the marker during the passage of the e tromagnetic field only at a certain orientation has a fl that is zero. This means that the risk for passage witho registration is very limited. The invention will be further explained referring to the drawing, where

Fig. 1 shows the system according to the invention in the shape of a block diagram Fig. 2 shows a way of use of the system accord¬ ing to the invention perspectively and schematically, Fig. 3 shows another way of use with information of the construction of the aerial, and Fig. 4 shows a third way of use of the system according to the invention.

In Fig. 1 is shown how an aerial 1 is connected partly to a transmitter 2 and partly to a receiver 3, 4 through a switch 5. This switch is controlled by a synchronizing unit 6 with a suitably high frequency. By transmitting a brief signal from the transmitter 2 with a suitable frequency an alternating current is induced in the LC-circuit of a marker 18, if this marker is in the rather limited elec- tromagnetic field that is made by the transmitter aerial 1. When this signal transmittance stops, i.e. when the aerial 1 is connected to the receiver 3, 4 by means of the switch 5, the LC-circuit of the marker sends out a signal with the same frequency, until the oscillation in the LC- circuit dies out. This signal is received by the aerial 1 so that the signal is sent off via the receiver 3, ^ to a signal processing circuit 7. This circuit 7 receives at the same time impulses from the synchronizing circuit 6, so that it is able to count, how many signals are received from a marker in an uninterrupted succession. This can be achieved by zeroing the counter if no signal is received during the receiving period immediately after a transmitting periode. It has appeared that a claim for e.g. 100 received signals from a marker in an uninterrupted succession satis- factorily secures that it is a marker passage and not any electrical noise. The signal processing circuit 7 also moni¬ tors, whether the received signals have the same frequency

O PI IPO as the signals which have been sent 'out. by the transmitte 2. This secures furthermore from false alarm. If the alar is to be given, i.e. if 100 signals have been, received in an uninterrupted succession with a correct frequency the signal processing circuit 7 sends an larm signal to an auditory or a visual alarm system.

In Fig. 2 is shown how several aerials 8 can. be placed in a way that a broad passage can be controlled. The system is built-in in a frame stand. The aerial that is shaped l figure eight is placed in the frame parts 9,. 10, 11, 12, 13, 14, 15, and l6, whereas the transmitter 2, the receiv er 3, , and the monitoring 'unit 7 are built-in in a box 17.

In Fig. 3 the system is extended by an extra aerial. One aerial 19 is here placed in a door, the other aerial bein placed in the floor by the door opening. As the two aeria are at right angles to each other the door passage is com pletely secured, the marker lδ being registered with what ever orientation it may have contrary to the placing in Figs. 2 and 4, where the marker may pass freely if it is oriented at right angles to the aerial as well as the flo

Finally a placing of the system is shown i Fig." 4 by a cash register in a shop.

The construction according to the invention can be' used whereever you want to control the taking of articles. Thus you may use the system e.g. in libraries, as the marker can be fastened or placed invisibly in shape of thin films in the cover of the books.

- O

Claims

C A I M S
1. System for the registration of the passage of articles through a priorly determined field of the kind that com- prises a transmitter and a receiver with a common aerial for alternately transmittance and receiving as well as a marker fastened to the articles for receiving and trans¬ mittance of signals by the passage of a transmitter- and receiver-bracket or -brackets, c h a r a c t e r i z e d i n that the transmittance and receiving function changes at a suitably high frequency, that the transmitted signals have a constant frequency during the -complete transmittance period, that an analytical circuit (7) monitors the number of received signals from the marker (18), and compares the frequency of these to that of the signals which are trans¬ mitted by the transmitter (2), and that the marker (l8) consists of a tuned circuit, i.e. of an inductive and a capacitive component.
2. System according to claim 1, c h a r a c t e r i z e d i n that the transmitter- and receiver aerial (1) is shaped like a figure eight or a double loop.
PCT/DK1979/000023 1978-08-09 1979-08-09 System for the registration of the passage of articles through a previously determined field WO1980000386A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DK3511/78 1978-08-09
DK351178A DK145169C (en) 1978-08-09 1978-08-09 Installations for detecting a passage of an object through the field etforudbestemt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792953405 DE2953405A1 (en) 1978-08-09 1979-08-09 System for the registration of the passage of articles through a deterministic Previously mined field

Publications (1)

Publication Number Publication Date
WO1980000386A1 true true WO1980000386A1 (en) 1980-03-06

Family

ID=8123744

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1979/000023 WO1980000386A1 (en) 1978-08-09 1979-08-09 System for the registration of the passage of articles through a previously determined field

Country Status (4)

Country Link
DE (1) DE2953405C2 (en)
DK (1) DK145169C (en)
EP (1) EP0016809A1 (en)
WO (1) WO1980000386A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3233028A1 (en) * 1981-09-10 1983-03-24 Sensormatic Electronics Corp Electric monitoring device with movable antenna elements
USRE32627E (en) * 1981-09-10 1988-03-22 Sensormatic Electronics Corporation Electrical surveillance apparatus with moveable antenna elements

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4222679C2 (en) * 1992-07-07 1997-10-16 Spreepatent Schutzrechtsverwer Method and apparatus for an improved perception of events during the transmission of sports events
DE4414399A1 (en) * 1994-04-26 1994-09-15 Siegfried Mehl Anti-theft element
WO1996005522A3 (en) * 1994-08-09 1996-05-23 Micro Tag Temed Ltd Method for labeling, verification and/or identifying and device for implementing said method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2541982A (en) * 1946-05-22 1951-02-20 Henry E Bernstein Radio ranging and craft identification system
US3740742A (en) * 1971-05-11 1973-06-19 T Thompson Method and apparatus for actuating an electric circuit
US3810147A (en) * 1971-12-30 1974-05-07 G Lichtblau Electronic security system
US3818472A (en) * 1972-05-26 1974-06-18 K Mauk R.f. system for detecting unauthorized travel of articles through a selected zone
US4074249A (en) * 1977-02-04 1978-02-14 Knogo Corporation Magnetic detection means
US4135183A (en) * 1977-05-24 1979-01-16 Minnesota Mining And Manufacturing Company Antipilferage system utilizing "figure-8" shaped field producing and detector coils

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3500373A (en) * 1966-05-06 1970-03-10 Nat Bank Of North America The Method and apparatus for article theft detection
NL161904C (en) * 1973-04-13 Knogo Corp Theft-detection system.
US3961322A (en) * 1974-07-02 1976-06-01 Lichtblau G J Real time signal discrimination circuitry

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2541982A (en) * 1946-05-22 1951-02-20 Henry E Bernstein Radio ranging and craft identification system
US3740742A (en) * 1971-05-11 1973-06-19 T Thompson Method and apparatus for actuating an electric circuit
US3810147A (en) * 1971-12-30 1974-05-07 G Lichtblau Electronic security system
US3818472A (en) * 1972-05-26 1974-06-18 K Mauk R.f. system for detecting unauthorized travel of articles through a selected zone
US4074249A (en) * 1977-02-04 1978-02-14 Knogo Corporation Magnetic detection means
US4135183A (en) * 1977-05-24 1979-01-16 Minnesota Mining And Manufacturing Company Antipilferage system utilizing "figure-8" shaped field producing and detector coils

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3233028A1 (en) * 1981-09-10 1983-03-24 Sensormatic Electronics Corp Electric monitoring device with movable antenna elements
USRE32627E (en) * 1981-09-10 1988-03-22 Sensormatic Electronics Corporation Electrical surveillance apparatus with moveable antenna elements

Also Published As

Publication number Publication date Type
DK145169C (en) 1983-02-21 grant
DE2953405C2 (en) 1987-12-23 grant
DK145169B (en) 1982-09-20 grant
DK351178A (en) 1980-02-10 application
EP0016809A1 (en) 1980-10-15 application

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