EP0703637A1 - Antenne pour un système électronique de surveillance - Google Patents

Antenne pour un système électronique de surveillance Download PDF

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Publication number
EP0703637A1
EP0703637A1 EP95810549A EP95810549A EP0703637A1 EP 0703637 A1 EP0703637 A1 EP 0703637A1 EP 95810549 A EP95810549 A EP 95810549A EP 95810549 A EP95810549 A EP 95810549A EP 0703637 A1 EP0703637 A1 EP 0703637A1
Authority
EP
European Patent Office
Prior art keywords
hollow profile
antenna according
antenna
longitudinal slot
profile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95810549A
Other languages
German (de)
English (en)
Inventor
Ernst Jetzer
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.)
Actron Entwicklungs AG
Original Assignee
Actron Entwicklungs AG
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 Actron Entwicklungs AG filed Critical Actron Entwicklungs AG
Publication of EP0703637A1 publication Critical patent/EP0703637A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • G08B13/2474—Antenna or antenna activator geometry, arrangement or layout
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/04—Screened antennas

Definitions

  • the present invention relates to an antenna for an electronic security system with a hollow profile for receiving an antenna wire, as is mounted in the exit area of many shops for theft monitoring.
  • An antenna of this type is known for example from US-A-4,251,808, in which case the hollow profile is a closed metal tube.
  • Different variants with single and multiple loops of the antenna wire are described, with cross bars being provided in the multi-loop types for receiving transverse sections of the antenna wire.
  • the metal tube is used primarily for the optical cladding of the antenna wire against capacitive interference.
  • a similar construction is known from DE-A1-4027710.
  • a disadvantage of these antennas is above all the relatively complex insertion of the antenna wire and possibly further electrical circuit elements into the metal tube. This applies in particular to the multi-loop types, in which the attachment of the crossbars also requires a great deal of effort.
  • a multi-loop antenna is known with an antenna wire designed as a coaxial cable in a hollow profile made of insulating material. Because the hollow profile is composed of two half-shells, the insertion of the antenna wire is made considerably easier. Due to the shape of the half-shells and the one required to manufacture them However, the geometry of the antenna is defined for tools and shapes. Every change in geometry requires new tools or shapes.
  • the geometric shape of the antenna especially as far as the number of loops is concerned, should be easy to change.
  • the antenna according to the invention accordingly has an insertion shape and a longitudinal slot through which the antenna wire in its intended form can be inserted into the hollow profile.
  • the antenna wire can thus definitely be placed or bent into its final shape with the desired number of loops before it is introduced into the hollow profile and, if it is not itself sufficiently dimensionally stable, can also be stiffened in this shape (form of determination) by suitable aids.
  • the antenna wire therefore does not get its final shape from the hollow profile.
  • All additional circuit elements that may be required, such as bridging resistances between individual loops and / or connecting cables for an alarm lamp, can be included in the "antenna wire package" so that a uniform insertion element for the hollow profile is created.
  • a dimensionally stable body can be inserted into the hollow profile, it must have an insertion shape, for example a U-shape with two parallel ones Thighs.
  • the longitudinal slot in the hollow profile must of course be provided on the inside of the U-bend.
  • any crosspieces Flexibility with regard to the number and position of any crosspieces and thus also with regard to the number of antenna loops is achieved within the framework of the construction according to the invention in that the ends of the crosspieces are also longitudinally displaceable in the longitudinal slot of the hollow profile.
  • the crosspieces are preferably also hollow profiles and more preferably composed of two half profiles.
  • the crosspieces are either made of a non-conductive material or insulated at their ends so that they do not form short-circuit bridges.
  • the area framed by the hollow profile can be closed by plate-shaped inserts. On the one hand, this prevents e.g. Children can simply climb up on the antennas and outline them; the plate-shaped inserts can also be used to advantage as advertising space. Like the crossbars, they can be guided in the longitudinal slot.
  • the antenna shown in the figures has an approximately U-shaped hollow profile 1 with a continuous longitudinal slot 2 on the inside of the arc.
  • An antenna wire or antenna wire package 3 is inserted into the hollow profile 1 from below, as can be seen in FIG. 2.
  • the antenna wire package 3 will consist of several loops of an antenna wire, preferably twisted relative to one another, whereby this length section can certainly run through several times. However, it could just as well consist of just a single loop.
  • the antenna wire package 3 should at least be dimensionally stable in itself that it can be inserted as a whole through the longitudinal slot 2 into the hollow profile 1. If the antenna wire does not have sufficient inherent rigidity, it can be stiffened by additional aids and kept in its intended form.
  • two transverse webs 4 are provided to accommodate the two central horizontal sections of the antenna wire or antenna wire package 3 that result from the multiple loop.
  • the crossbars 4 are composed of an upper and a lower half profile and can be easily attached in this way around the horizontal sections mentioned.
  • the antenna wire does not have to be laboriously passed through it.
  • the transverse webs 4 are provided with an engagement profile 5, with which they can engage in the longitudinal slot 2 in the hollow profile 1 and engage behind its edges. They are inserted into the hollow section 1 together with the antenna wire package.
  • the construction can be seen very flexibly with regard to the number and position of crossbars 4.
  • the hollow profile 1 is held by a foot part 6, which has two holding columns 7 and can be screwed onto the floor.
  • the two support columns 7 are provided on their outer sides, like the crosspieces 4, each with an engagement profile 8 for the longitudinal slot 2 in the hollow profile 1.
  • the hollow profile 1 can therefore be attached with its two vertical legs from above onto the foot part 6 or its two holding columns 7.
  • the space between the two support columns 7 of the foot part 6 can advantageously be used as a receptacle for an electronic unit (not shown).
  • guide slots 9 are provided for inserting one or more circuit boards or mounting plates, as well as lateral and upper wall elements 10.
  • the longitudinal slot 2 in the hollow profile 1, at least where it is exposed, can also be provided with a cover profile 11 which, as can be seen in FIG. 5, can be introduced into the slot.
  • the hollow profile 1 has two inwardly curved sections 16 at the longitudinal slot 2, which contribute significantly to its stiffening.
  • the free areas framed by the hollow profile 1 and subdivided by the transverse webs 4 can be closed by plate-shaped inserts.
  • inserts 12 - 14 are indicated by a shading.
  • the inserts can be transparent, but in particular can be used as areas for advertising prints.
  • they are preferably provided with a lateral engagement profile for the longitudinal slot 2 in the hollow profile 1 and inserted together with the antenna wire package. They are also preferably individually replaceable.
  • the plate-shaped inserts could also be attached to the crossbars 4.
  • An alarm lamp 15 is also provided in the upper part of the hollow profile 1. This is simply attached to the hollow profile 1 by snapping it into the longitudinal slot 2 from below.
  • the hollow profile 1 preferably has a triangular cross-sectional shape. This proves to be advantageous if e.g. a customer bumps into the antenna with a shopping cart because the impact is then deflected sideways.
  • the triangular cross-sectional shape also gives the antenna according to the invention an optically appealing appearance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Support Of Aerials (AREA)
  • Burglar Alarm Systems (AREA)
EP95810549A 1994-09-23 1995-09-05 Antenne pour un système électronique de surveillance Withdrawn EP0703637A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2899/94 1994-09-23
CH289994 1994-09-23

Publications (1)

Publication Number Publication Date
EP0703637A1 true EP0703637A1 (fr) 1996-03-27

Family

ID=4244125

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95810549A Withdrawn EP0703637A1 (fr) 1994-09-23 1995-09-05 Antenne pour un système électronique de surveillance

Country Status (2)

Country Link
EP (1) EP0703637A1 (fr)
JP (1) JPH08321717A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003003323A1 (fr) * 2001-06-29 2003-01-09 Sensormatic Electronics Corporation Antenne de surveillance d'articles electronique fixee a une structure verticale
WO2005057725A1 (fr) * 2003-12-06 2005-06-23 Telegesis (Uk) Ltd Antenne a radiofrequence
DE102005020842A1 (de) * 2005-05-02 2006-11-09 Dekoplast Gmbh Husse für Transponderantennen
NL1033629C2 (nl) * 2007-04-02 2008-10-06 Nedap Nv Modulair multifunctioneel antenneframe voor een anti-winkeldiefstalsysteem.
DE202012008852U1 (de) * 2012-09-17 2013-12-18 Checkpoint Systems, Inc. Antennenvorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251808A (en) 1979-11-15 1981-02-17 Lichtblau G J Shielded balanced loop antennas for electronic security systems
US4872018A (en) 1987-08-31 1989-10-03 Monarch Marking Systems, Inc. Multiple loop antenna
EP0352513A2 (fr) * 1988-07-29 1990-01-31 Knogo Corporation Système de surveillance d'articles isolés contre les influences indésirables et antenne à cet effet
DE4027710A1 (de) 1989-09-01 1991-03-07 Monarch Marking Systems Inc Magnetisches antennensystem mit unabhaengig steuerbarer elektrischer feldabschirmung und magnetischer feldabgleichung
EP0428384A2 (fr) * 1989-11-15 1991-05-22 Minnesota Mining And Manufacturing Company Réseau universel pour système magnétique-électronique de surveillance d'articles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251808A (en) 1979-11-15 1981-02-17 Lichtblau G J Shielded balanced loop antennas for electronic security systems
US4872018A (en) 1987-08-31 1989-10-03 Monarch Marking Systems, Inc. Multiple loop antenna
EP0352513A2 (fr) * 1988-07-29 1990-01-31 Knogo Corporation Système de surveillance d'articles isolés contre les influences indésirables et antenne à cet effet
DE4027710A1 (de) 1989-09-01 1991-03-07 Monarch Marking Systems Inc Magnetisches antennensystem mit unabhaengig steuerbarer elektrischer feldabschirmung und magnetischer feldabgleichung
EP0428384A2 (fr) * 1989-11-15 1991-05-22 Minnesota Mining And Manufacturing Company Réseau universel pour système magnétique-électronique de surveillance d'articles

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003003323A1 (fr) * 2001-06-29 2003-01-09 Sensormatic Electronics Corporation Antenne de surveillance d'articles electronique fixee a une structure verticale
WO2005057725A1 (fr) * 2003-12-06 2005-06-23 Telegesis (Uk) Ltd Antenne a radiofrequence
DE102005020842A1 (de) * 2005-05-02 2006-11-09 Dekoplast Gmbh Husse für Transponderantennen
DE102005020842B4 (de) * 2005-05-02 2006-12-14 Dekoplast Gmbh Husse für Transponderantennen
NL1033629C2 (nl) * 2007-04-02 2008-10-06 Nedap Nv Modulair multifunctioneel antenneframe voor een anti-winkeldiefstalsysteem.
EP1978593A1 (fr) * 2007-04-02 2008-10-08 N.V. Nederlandsche Apparatenfabriek NEDAP Cadre d' antenne multifonctionnelle modulaire pour système antivol à l'étalage
DE202012008852U1 (de) * 2012-09-17 2013-12-18 Checkpoint Systems, Inc. Antennenvorrichtung
US20140078015A1 (en) * 2012-09-17 2014-03-20 Checkpoint Systems, Inc. Antenna device
US9461354B2 (en) 2012-09-17 2016-10-04 Checkpoint Systems, Inc. Single piece antenna device

Also Published As

Publication number Publication date
JPH08321717A (ja) 1996-12-03

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