NO902808L - Fremgangsmaate for deaktivering av en merkebrikke og merkebrikke for saadan deaktivering. - Google Patents

Fremgangsmaate for deaktivering av en merkebrikke og merkebrikke for saadan deaktivering.

Info

Publication number
NO902808L
NO902808L NO90902808A NO902808A NO902808L NO 902808 L NO902808 L NO 902808L NO 90902808 A NO90902808 A NO 90902808A NO 902808 A NO902808 A NO 902808A NO 902808 L NO902808 L NO 902808L
Authority
NO
Norway
Prior art keywords
strip
bias
magnetic
magnetic material
predetermined
Prior art date
Application number
NO90902808A
Other languages
English (en)
Other versions
NO902808D0 (no
Inventor
Larry Keith Canipe
Original Assignee
Security Tag Systems Inc
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 Security Tag Systems Inc filed Critical Security Tag Systems Inc
Publication of NO902808D0 publication Critical patent/NO902808D0/no
Publication of NO902808L publication Critical patent/NO902808L/no

Links

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
    • G08B13/2408—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 ferromagnetic tags
    • G08B13/2411—Tag deactivation

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Financial Or Insurance-Related Operations Such As Payment And Settlement (AREA)
  • Electrotherapy Devices (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

Fremgangsmåte for å deaktivere en trekvensdelende transponder (10) som omfatter en aktiv strimmel (12,14) av magnetisk material og som, når den formagnetiseres til et forut bestemt magnetisk feltstyrkeområde, reagerer på eksitering ved elektromagnetisk stråling ved den første forut bestemte frekvens med å avgi elektromagnetisk stråling ved en annen forut bestemt frekvens som er en frekvensdelt kvotient av den første forut bestemte frekvens. Transponderen omfatter videre en formagnetiseringsstrimmel (16) anordnet slik i forhold til den aktive strimmel at denne formagnetiserer til å ligge innenfor det forut fastlagte magnetiske feltstyrkeområde bare når formagnetiseringsstrimmelen er magnetisert. Formagneti- seringsstrimmelen kan omformes til en trepolet stavmagnet med en pol av den ene magnetiske polaritet i midtområdet (34) av strimmelen (16) samt med en pol av den annen polaritet i hver ende.av formagnetiseringsstrimmelen (16). De derved oppret- tede motsatt rettede formagnetiseringsfelter i de to lengde- halvdeler av den aktive strimmel (12,14) vil da sørge for at elektromagnetisk utstråling fra de to halvdeler vil oppheve hverandre. Dette oppnås ved å fare en magnet i tverretningen tvers over og i umiddelbar nærhet av formagnetiserings- strimmelen (16), idet magneten har tilstrekkelig flukstetthet til å overvinne tidligere magnetisering av strimmelen.
NO90902808A 1989-06-30 1990-06-25 Fremgangsmaate for deaktivering av en merkebrikke og merkebrikke for saadan deaktivering. NO902808L (no)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/374,961 US4968972A (en) 1989-06-30 1989-06-30 Conversion of bias strip in a frequency-dividing-transponder tag into a tripole bar magnet to deactivate the tag

Publications (2)

Publication Number Publication Date
NO902808D0 NO902808D0 (no) 1990-06-25
NO902808L true NO902808L (no) 1991-01-02

Family

ID=23478923

Family Applications (1)

Application Number Title Priority Date Filing Date
NO90902808A NO902808L (no) 1989-06-30 1990-06-25 Fremgangsmaate for deaktivering av en merkebrikke og merkebrikke for saadan deaktivering.

Country Status (8)

Country Link
US (1) US4968972A (no)
EP (1) EP0405764B1 (no)
JP (1) JPH0341597A (no)
AT (1) ATE111245T1 (no)
AU (1) AU630962B2 (no)
CA (1) CA2018267A1 (no)
DE (1) DE69012233T2 (no)
NO (1) NO902808L (no)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5187462A (en) * 1990-02-15 1993-02-16 Minnesota Mining And Manufacturing Company Multiple magnet assembly for use with electromagnetic article surveillance markers
US5347733A (en) * 1992-03-30 1994-09-20 Whittington Richard W Magnetic name tag
US5414412A (en) * 1993-06-16 1995-05-09 Security Tag Systems, Inc. Frequency dividing transponder, including amorphous magnetic alloy and tripole strip of magnetic material
US6104311A (en) * 1996-08-26 2000-08-15 Addison Technologies Information storage and identification tag
US6692672B1 (en) 1997-06-02 2004-02-17 Avery Dennison Corporation EAS marker and method of manufacturing same
US6067016A (en) * 1997-06-02 2000-05-23 Avery Dennison Corporation EAS marker and method of manufacturing same
JP3399309B2 (ja) * 1997-08-29 2003-04-21 松下電器産業株式会社 磁歪振動子、それを埋め込んだ道路および磁歪振動子の埋め込み方法
US5852856A (en) * 1997-11-13 1998-12-29 Seidel; Stuart T. Anti theft ink tag

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781661A (en) * 1966-03-02 1973-12-25 E Trikilis Magnetic material and method of producing same
US3747086A (en) * 1968-03-22 1973-07-17 Shoplifter International Inc Deactivatable ferromagnetic marker for detection of objects having marker secured thereto and method and system of using same
US4158434A (en) * 1969-11-07 1979-06-19 Glen Peterson Electronic status determining system for goods
US4484184A (en) * 1979-04-23 1984-11-20 Allied Corporation Amorphous antipilferage marker
US4499444A (en) * 1983-05-20 1985-02-12 Minnesota Mining And Manufacturing Company Desensitizer for ferromagnetic markers used with electromagnetic article surveillance systems
US4727360A (en) * 1985-09-13 1988-02-23 Security Tag Systems, Inc. Frequency-dividing transponder and use thereof in a presence detection system
US4684930A (en) * 1986-03-18 1987-08-04 Knogo Corporation Method and apparatus for deactivating targets used in electromagnetic type article surveillance systems

Also Published As

Publication number Publication date
AU5680390A (en) 1991-01-03
DE69012233T2 (de) 1994-12-22
AU630962B2 (en) 1992-11-12
JPH0341597A (ja) 1991-02-22
NO902808D0 (no) 1990-06-25
EP0405764B1 (en) 1994-09-07
ATE111245T1 (de) 1994-09-15
CA2018267A1 (en) 1990-12-31
EP0405764A1 (en) 1991-01-02
DE69012233D1 (de) 1994-10-13
US4968972A (en) 1990-11-06

Similar Documents

Publication Publication Date Title
EP0232584A3 (en) Improved label for use in anti-theft surveillance system
SE8306208D0 (sv) Larmanordning
SE7705112L (sv) Bredbandig vagisolator med tva portar
US4593209A (en) Read head for Wiegand Wire
NO902808D0 (no) Fremgangsmaate for deaktivering av en merkebrikke og merkebrikke for saadan deaktivering.
NO910638L (no) Bildedannelse ved magnetisk resonans.
NO901639D0 (no) Fremgangsmaate og anordning for behandling av et hydrocarbonbrensel.
ATE162003T1 (de) Hocheffizienter dauermagnet mit joch
DE69024365D1 (de) Optimaler entwurf von zweidimensionalen permanentmagneten
CA2162999A1 (en) Collector type article surveillance marker having a persistant state
SE9202871L (sv) Yig-komponent innefattande en magnetkrets och åtminstone en ferritkristall
DK1044702T3 (da) Magnetspiral
GB1179855A (en) Improvements in or relating to Magnet Assemblies
DE69019416D1 (de) Magnetische Vorrichtungen mit verbesserten Polen.
US5677652A (en) Microwave ferrite resonator with parallel permanent magnet bias
Zabluda et al. Temperature dependence of optical absorption and magnetooptic effects in iron borate in the super (6) A sub (1 g) arrow right super (4) T sub (1 g), super (4 T) sub (2) gt) ransition region.
Dahl et al. Magnetization effects in superconducting accelerator magnets
Liao et al. Anomalous frequency dependence of spin relaxation in the concentrated spin glass, a−(Fe0. 16Ni0. 84) 75P16B6Aℓ3
JPS5715223A (en) Magnetic resistance effect type magnetic head
JPS57132147A (en) Photomask and its mask handler
SU1635859A1 (ru) Способ управления поляризованным лазерным излучением
JPS6468994A (en) Semiconductor laser device
JP2002527837A (ja) 物品監視システムとともに使用する遠界磁石の再感応化装置
Fridman Magnetic State of the Test Zone in a Component Demagnetized Along the Hysteresis Loop by Means of an Applied U-shaped Electromagnet
PL100111B1 (pl) Sposob wyznaczenia w strefie bliskiej kierunku zrodla pola elektromagnetycznego z antena magnetyczna o dowolnej i nieznanej orientacji w osrodku elektrycznie niejednorodnym i anizotropowym