EP0655719B1 - Antenna element for anti-theft devices - Google Patents

Antenna element for anti-theft devices Download PDF

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Publication number
EP0655719B1
EP0655719B1 EP94120246A EP94120246A EP0655719B1 EP 0655719 B1 EP0655719 B1 EP 0655719B1 EP 94120246 A EP94120246 A EP 94120246A EP 94120246 A EP94120246 A EP 94120246A EP 0655719 B1 EP0655719 B1 EP 0655719B1
Authority
EP
European Patent Office
Prior art keywords
antenna
antenna element
cover
antennas
bow
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
EP94120246A
Other languages
German (de)
French (fr)
Other versions
EP0655719A3 (en
EP0655719A2 (en
Inventor
Bertil Holmgren
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.)
MW Trading ApS
Original Assignee
MW Trading ApS
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 MW Trading ApS filed Critical MW Trading ApS
Priority to AT94120246T priority Critical patent/ATE187833T1/en
Priority to DE1989629118 priority patent/DE68929118T2/en
Priority claimed from EP89906836A external-priority patent/EP0425515B1/en
Publication of EP0655719A2 publication Critical patent/EP0655719A2/en
Publication of EP0655719A3 publication Critical patent/EP0655719A3/en
Application granted granted Critical
Publication of EP0655719B1 publication Critical patent/EP0655719B1/en
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
    • G08B13/2405—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 characterised by the tag technology used
    • G08B13/2422—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 characterised by the tag technology used using acoustic or microwave tags
    • 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
    • G08B13/2428—Tag details
    • G08B13/2434—Tag housing and attachment details

Definitions

  • the invention relates to an antenna element for anti-theft devices of the type affecting a magnetic, acoustic or electromagnetic field, which is maintained between bow-shaped antennas at the exit of a shop, to disturb the field and cause signal generation.
  • the antenna element of the invention is defined by the characteristics of claim 1.
  • An antenna device according to the preamble of Claim 1 is known from EP-A-0 002 595.
  • the anti-theft device in FIG. 1 comprises a sleeve 10 open at one end thereof, which has rectangular cross-sectional shape and preferably is made of plastics, for example polycarbonate. On one broad side thereof the sleeve is provided with a cover 11 of the same material as the sleeve, said cover being attached to the sleeve by ultrasound welding.
  • the sleeve 10 has opposing longitudinal slots 12 in the two narrow sides thereof, which are big enough to allow the bow 14 of a spectacle frame 13 to be passed through the slots.
  • Clamping means is provided in the sleeve 10, and the body formed by sleeve 10 and cover 11 is mounted to the bow, and is demounted from the bow by using a special tool, which can be engaged with said clamping means.
  • an element 33 (a so-called “diode") of the type affecting a magnetic, acoustic or electromagnetic field maintained between bow-shaped antennas at the exit of a shop, to disturb the field and cause signal generation.
  • Said element is mounted inside the cover 11, and for this purpose the cover has on the backside thereof four small pins 34 between which the element 33 is located while antenneas 35 of flexible wire provided on the element are passed around other, large pins 36 on the backside of the cover.
  • the pins When the cover 11 is attached to the sleeve 10 the pins are positioned adjacent the outside surface of the sleeve such that the element is held in a well defined position.
  • the antenna element of the invention formed by element 33 and antennas 35 has a configuration similar to the letter S when mounted to cover 11.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Support Of Aerials (AREA)
  • Burglar Alarm Systems (AREA)
  • Eyeglasses (AREA)
  • Details Of Aerials (AREA)

Abstract

An antenna element (33) for anti-theft devices (10, 11) of the type affecting a magnetic, acoustic or electromagnetic field, has two antennas (35) projecting from opposite sides of said element and forms together with said antennas a configuration similar to the letter S. <IMAGE> <IMAGE>

Description

  • The invention relates to an antenna element for anti-theft devices of the type affecting a magnetic, acoustic or electromagnetic field, which is maintained between bow-shaped antennas at the exit of a shop, to disturb the field and cause signal generation.
  • The antenna element of the invention is defined by the characteristics of claim 1.
  • An antenna device according to the preamble of Claim 1 is known from EP-A-0 002 595.
  • In order to explain the invention in more detail an embodiment thereof will be described below reference being made to the accompanying drawing in which
  • FIG. 1 is a fragmentary perspective view of a spectacle frame provided with an anti-theft device, and
  • FIG. 2 is view of a cover from the back side thereof which is attached to the anti-theft device and is provided with the antenna element of the invention.
  • The anti-theft device in FIG. 1 comprises a sleeve 10 open at one end thereof, which has rectangular cross-sectional shape and preferably is made of plastics, for example polycarbonate. On one broad side thereof the sleeve is provided with a cover 11 of the same material as the sleeve, said cover being attached to the sleeve by ultrasound welding. The sleeve 10 has opposing longitudinal slots 12 in the two narrow sides thereof, which are big enough to allow the bow 14 of a spectacle frame 13 to be passed through the slots. Clamping means is provided in the sleeve 10, and the body formed by sleeve 10 and cover 11 is mounted to the bow, and is demounted from the bow by using a special tool, which can be engaged with said clamping means.
  • Inside the body there is located an element 33 (a so-called "diode") of the type affecting a magnetic, acoustic or electromagnetic field maintained between bow-shaped antennas at the exit of a shop, to disturb the field and cause signal generation. Said element is mounted inside the cover 11, and for this purpose the cover has on the backside thereof four small pins 34 between which the element 33 is located while antenneas 35 of flexible wire provided on the element are passed around other, large pins 36 on the backside of the cover. When the cover 11 is attached to the sleeve 10 the pins are positioned adjacent the outside surface of the sleeve such that the element is held in a well defined position. As will be seen from FIG. 2 the antenna element of the invention formed by element 33 and antennas 35 has a configuration similar to the letter S when mounted to cover 11.

Claims (2)

  1. Antenna device for antitheft-appliancies (10, 11) of the type affecting a magnetic field, comprising an antenna element (33) and two antennas (35) projecting from opposite sides of said element and forming together with the element a configuration similar to the letter S each bow of which consists of two parallel first straight portions mutually spaced transversely thereof, and a second straight portion extending between one ends of said first portions, the other ends of said first portions of each bow, located at opposite sides of the S, each being connected to said antenna element located therebetween, characterised in that each antenna (35) consists of a wire, and that means (34, 36) are provided on the backside of a cover (11) forming part of an anti-theft device (10, 11) defining the configuration of the antenna wires and retaining the antenna element (33) and the antennas on said substrate.
  2. Antenna device as in claim 1, characterised in that said means (34, 36) comprise projecting pins on said cover (11).
EP94120246A 1989-05-19 1989-05-19 Antenna element for anti-theft devices Expired - Lifetime EP0655719B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT94120246T ATE187833T1 (en) 1989-05-19 1989-05-19 ANTENNA ELEMENT FOR ANTI-THEFT DEVICES
DE1989629118 DE68929118T2 (en) 1989-05-19 1989-05-19 Antenna element for anti-theft devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89906836A EP0425515B1 (en) 1987-12-14 1989-05-19 Anti-theft device for spectacle frames

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP89906836A Division EP0425515B1 (en) 1987-12-14 1989-05-19 Anti-theft device for spectacle frames
EP89906836.5 Division 1989-05-19

Publications (3)

Publication Number Publication Date
EP0655719A2 EP0655719A2 (en) 1995-05-31
EP0655719A3 EP0655719A3 (en) 1995-08-09
EP0655719B1 true EP0655719B1 (en) 1999-12-15

Family

ID=8203393

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94120246A Expired - Lifetime EP0655719B1 (en) 1989-05-19 1989-05-19 Antenna element for anti-theft devices

Country Status (2)

Country Link
EP (1) EP0655719B1 (en)
AT (1) ATE126379T1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54120592A (en) * 1977-12-09 1979-09-19 Lintech Instr Ltd Transponder
US4413254A (en) * 1981-09-04 1983-11-01 Sensormatic Electronics Corporation Combined radio and magnetic energy responsive surveillance marker and system
US4642640A (en) * 1983-04-25 1987-02-10 Sensormatic Electronics Corporation Signal receptor-reradiator and surveillance tag using the same
US4736207A (en) * 1986-01-31 1988-04-05 Sensormatic Electronics Corporation Tag device and method for electronic article surveillance

Also Published As

Publication number Publication date
ATE126379T1 (en) 1995-08-15
EP0655719A3 (en) 1995-08-09
EP0655719A2 (en) 1995-05-31

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