WO1998035878B1 - Multi-phase mode multiple coil distance deactivator for magnetomechanical eas markers - Google Patents
Multi-phase mode multiple coil distance deactivator for magnetomechanical eas markersInfo
- Publication number
- WO1998035878B1 WO1998035878B1 PCT/US1998/001815 US9801815W WO9835878B1 WO 1998035878 B1 WO1998035878 B1 WO 1998035878B1 US 9801815 W US9801815 W US 9801815W WO 9835878 B1 WO9835878 B1 WO 9835878B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- loops
- marker
- mode
- loop
- occasions
- Prior art date
Links
- 239000003550 marker Substances 0.000 claims abstract 29
- 238000010408 sweeping Methods 0.000 claims 10
- 230000001939 inductive effect Effects 0.000 claims 8
- 230000002708 enhancing Effects 0.000 claims 1
Abstract
A device for deactivating a magnetomechanical electronic article surveillance marker (126) includes first (L11), second (L12), third (L13) and fourth (L14) rectangular coils arranged in a two-by-two array in a common plane. Drive circuitry energizes the coils according to an operating cycle which includes three modes. Taking into account the three modes of operation, substantial magnetic fields are generated in each of three mutually orthogonal directions so that a substantial deactivation field is provided along the length of the marker to be deactivated, regardless of the direction of orientation of the marker relative to the coil array. Two-coil and quadrature-driven deactivators are also disclosed.
Claims
AMENDED CLAIMS
[received by the International Bureau on 03 November 1998 (03.11.98); original claims 1, 12, 13, 17-19 and 25 amended; original claims 11 and 28 cancelled; new claims 31 and 32 added, remaining claims unchanged (7 pages)]
1. A method of deactivating a magnetomechanical electronic article surveillance marker, comprising the steps of: providing two conductive loops in proximity to each other; first energizing said loops on a plurality of first occasions to induce in said loops respective alternating currents substantially in phase with each other; second energizing said loops on a plurality of second occasions to induce in said loops respective alternating currents substantially 180Q out of phase with each other, said second occasions being different from said first occasions; and during a period of time that corresponds to at least one of said irst occasions and at least one of said second occasions, sweeping said magnetomechanical marker in proximity to said energized loops to demagnetize a bias element included in said marker.
2. A method according to claim 1, wherein said plurality of first occasions and said plurality of second occasions take place within a period of one second.
3. A method according to claim 1, wherein said loops are substantially planar and are arranged in a common, horizontall -oriented plane, and said sweeping step includes sweeping said marker above said common plane.
4. A method according to claim 3 , wherein said marker is swept at a distance of at least six inches above said common plane.
5. A method of deactivating a magnetomechanical electronic article surveillance marker, comprising the steps of: providing a first conductive loop and a second conductive loop in proximity to each other; energizing said first loop to induce therein a current which alternates at a predetermined frequency;
26
simultaneously with said energizing step, energizing said second loop to induce therein a current which alternates at said predetermined frequency and at a phase offset of substantially 90° relative to the alternating current in said first loop; and sweeping said magnetomechanical marker in proximity to said energized loops to demagnetize a bias element included in said marke .
6. A method according to claim 5, wherein said loops are substantially planar and are arranged in a common, horizontally-oriented plane, and said sweeping step includes sweeping said marker above said common plane.
7. A method according to claim 6 , wherein said marker is swept at a distance of at least six inches above said common plane.
8. A method of deactivating a magnetomechanical electronic article surveillance marker, comprising the steps of: providing first, second, third and fourth rectangular, coplanar, conductive loops, said loops being arranged adjacent each other in a two-by-two array, said first loop in an upper left-hand position in the array, said second loop in an upper right-hand position in the array, said third loop in a lower left-hand position in the array, and said fourth loop in a lower right-hand position in the array; first energizing said first and fourth loops on a plurality of first occasions to induce in said irst and fourth loops respective alternating currents that are substantially 180° out of phase with each other; second energizing said second and third loops on a plurality of second occasions to induce in said second and third loops respective alternating currents that are substantially 180° out of phase with each other, said second occasions being different from said first occasions; and during a period of time that corresponds to at
2 7
least one of said first occasions and one of said second occasions, sweeping said magnetomechanical marker in proximity to said loops to demagnetize a bias element included in said marker. 9. A method according to claim 8 , wherein said loops are arranged in a horizontally-oriented plane, and said sweeping step includes sweeping said marker above said plane.
10. A method according to claim 9, wherein said marker is swept at a distance of at least six inches above said plane.
12. Apparatus according to claim 17, wherein said first and second sequences of time intervals together comprise a duty cycle of at least 50%. 13. Apparatus according to claim 17 , wherein each of said loops is substantially planar and rectangular.
1 . Apparatus according to claim 13 , wherein said loops are congruent to each other and each loop has a long side that is substantially twice as long as a short side of the loop.
15. Apparatus according to claim 1 , wherein said loops are arranged side-by-side in a common plane so as to form a substantially square array of the two loops.
16. Apparatus according to claim 15, wherein said common plane of said two loops is horizontally arranged.
17. Apparatus for deactivating an electronic article surveillance marker, comprising: two conductive loops located in proximity to each other; and drive means for energizing said conductive loops, said drive means operating in a first mode in a first sequence of time intervals and in a second mode in a second sequence of time intervals interleaved with said first sequence of time intervals, said drive means inducing respective alternating currents in said loops that are substantially in phase with each other in said first mode, and inducing respective alternating currents in said loops that are substantially 180° out of phase
28
with each other in said second mode; wherein said loops are configured and arranged, and the drive means operates, so as to generate an alternating magnetic field for demagnetizing a bias element of a magnetomechanical electronic article surveillance marker, when said magnetomechanical marker is swept past said loops within a predetermined distance from said loops.
18. Apparatus according to claim 1 , wherein said currents alternate at 60 Hz.
19. Apparatus according to claim 17, wherein each of said loops is substantially planar; and further comprising shield means disposed in proximity to said loops for enhancing a field generated by each loop in a direction normal to the plane of the loop.
20. Apparatus according to claim 19, wherein said shield means includes two planar shield members, each arranged parallel to and in proximity to a respective one of said two loops. 21. Apparatus according to claim 19, wherein said loops are arranged in a common plane, and said shield means is a single planar member arranged parallel to and in proximity to said common plane.
22. Apparatus for deactivating an electronic article surveillance marker, comprising: first, second, third and fourth conductive loops located in proximity to each other; and drive means for energizing said conductive loops, said drive means operating in a first mode in a first sequence of time intervals, in a second mode in a second sequence of time intervals interleaved with said first sequence of time intervals, and in a third mode in a third sequence of time intervals interleaved with said first and second sequences, said drive means inducing respective alternating currents in all of said loops that are substantially in phase with each other in said first mode, said drive means inducing respective alternating currents in said loops in said second mode such that the
2 9
alternating currents in the first and third loops are substantially in phase with each other, and the alternating currents in said second and fourth loops are substantially in phase with each other and substantially 180° out of phase with the currents in the first and third loops, said drive means inducing respective alternating currents in said loops in said third mode such that the alternating currents in said first and second loops are substantially in phase with each other, and the alternating currents in said third and fourth loops are substantially in phase with each other and substantially 180" out of phase with the currents in the first and second loops.
23. Apparatus according to claim 22, wherein said first, second, third and fourth loops are all substantially planar and square and are arranged in a common plane so as to form a substantially square array of loops.
24. Apparatus according to claim 23, wherein said first loop corresponds to an upper left quadrant of said square array, said second loop corresponds to an upper right quadrant of said square array, said third loop corresponds to a lower left quadrant of said square array, and said fourth loop corresponds to a lower right quadrant of said square array.
25. Apparatus for deactivating an electronic article surveillance marker, comprising: two conductive loops located in proximity to each other; and drive means for energizing said conductive loops, said drive means inducing respective alternating currents in said loops such that the alternating currents are substantially 90° out of phase with each other; wherein said loops are configured and arranged, and the drive means operates, so as to generate an alternating magnetic field for demagnetizing a bias element of a magnetomechanical electronic article surveillance marker, when said magnetomechanical marker is
30
swept past said loops within a predetermined distance from said loops.
26. Apparatus according to claim 25, wherein said loops are substantially planar and rectangular and are arranged in a common plane.
27. Apparatus according to claim 26, wherein said common plane of said two loops is horizontally arranged.
29. Apparatus for deactivating an electronic article surveillance marker, comprising: first, second, third and fourth rectangular, coplanar, conductive loops, said loops being arranged adjacent each other in a two-by-two array, said first loop in an upper left-hand position in the array, said second loop in an upper right-hand position in the array, said third loop in a lower left-hand position in the array, and said fourth loop in a lower right-hand position in the array; drive means for energizing said loops, said drive means operating in a first mode in a irst sequence of time intervals, and in a second mode in a second sequence of time intervals interleaved with said first sequence of time intervals, said drive means inducing in said first and fourth loops, in said first mode, respective alternating currents that are substantially 180" out of phase with each other, and said drive means inducing in said second and third loops, in said second mode, respective alternating currents that are substantially 180° out of phase with each other.
30. Apparatus according to claim 29, wherein said second and third loops are not energized in said first mode and said first and fourth loops are not energized in said second mode.
31. Apparatus for deactivating a magnetomechanical electronic article surveillance marker, comprising: a first coil; a second coil in proximity to said first coil; drive means for energizing said coil, said drive means operating in a first mode in a first sequence of
31
time intervals, and in a second mode in a second sequence of time intervals interleaved with said first sequence of time intervals, said drive means driving said first coil with an alternating current in said first mode and driving said second coil with an alternating current in said second mode; wherein said second coil is not driven in said first mode and said first coil is not driven in said second mode. 32. A method of deactivating a magnetomechanical electronic article surveillance marker, comprising the steps of: providing a first coil; providing a second coil in proximity to said first coil; first energizing said first coil on a plurality of first occasions to induce in said first coil an alternating current; second energizing said second coil on a plurality of second occasions to induce in said second coil an alternating current, said second occasions being different from said first occasions; and during a period of time that corresponds to at least one of said first occasions and at least one of said second occasions, sweeping said magnetomechanical marker in proximity to said coils to demagnetize a bias element included in said marker.
32
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR9807819-4A BR9807819A (en) | 1997-02-03 | 1998-01-29 | Multiphase multiple coil distance deactivator for magnetomechanical eas markers |
| AU62574/98A AU730821B2 (en) | 1997-02-03 | 1998-01-29 | Multi-phase mode multiple coil distance deactivator for magnetomechanical EAS markers |
| JP53577698A JP2001511280A (en) | 1997-02-03 | 1998-01-29 | Multiphase mode multicoil remote inactivation device for magnetomechanical EAS marker |
| CA002279188A CA2279188C (en) | 1997-02-03 | 1998-01-29 | Multi-phase mode multiple coil distance deactivator for magnetomechanical eas markers |
| DE69823009T DE69823009T2 (en) | 1997-02-03 | 1998-01-29 | MULTI-PHASE DEACTIVATOR WITH SEVERAL COILS FOR MAGNETOMECHANICAL EAS LABEL |
| EP98904779A EP0956548B1 (en) | 1997-02-03 | 1998-01-29 | Multi-phase mode multiple coil distance deactivator for magnetomechanical eas markers |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/794,012 US5867101A (en) | 1997-02-03 | 1997-02-03 | Multi-phase mode multiple coil distance deactivator for magnetomechanical EAS markers |
| US08/794,012 | 1997-02-03 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| WO1998035878A2 WO1998035878A2 (en) | 1998-08-20 |
| WO1998035878A3 WO1998035878A3 (en) | 1998-12-03 |
| WO1998035878B1 true WO1998035878B1 (en) | 1999-01-07 |
Family
ID=25161415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1998/001815 WO1998035878A2 (en) | 1997-02-03 | 1998-01-29 | Multi-phase mode multiple coil distance deactivator for magnetomechanical eas markers |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5867101A (en) |
| EP (1) | EP0956548B1 (en) |
| JP (1) | JP2001511280A (en) |
| AR (1) | AR011102A1 (en) |
| AU (1) | AU730821B2 (en) |
| BR (1) | BR9807819A (en) |
| CA (1) | CA2279188C (en) |
| DE (1) | DE69823009T2 (en) |
| WO (1) | WO1998035878A2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6111507A (en) * | 1997-02-03 | 2000-08-29 | Sensormatic Electronics Corporation | Energizing circuit for EAS marker deactivation device |
| US6118378A (en) * | 1997-11-28 | 2000-09-12 | Sensormatic Electronics Corporation | Pulsed magnetic EAS system incorporating single antenna with independent phasing |
| US6084515A (en) * | 1999-01-07 | 2000-07-04 | Sensormatic Electronics Corporation | Coil array for EAS marker deactivation device |
| DE19923859A1 (en) * | 1999-05-25 | 2000-11-30 | Georg Siegel Gmbh Zur Verwertu | Device for the simultaneous magnetic influencing of a large number of acustomagnetic security devices |
| AU4088301A (en) * | 2000-03-17 | 2001-09-24 | Redcliffe Magtronics Ltd | Activation and deactivation of magnetic components |
| US6486782B1 (en) | 2000-07-07 | 2002-11-26 | 3M Innovative Properties | Device for changing the status of dual status magnetic electronic article surveillance markers |
| US6778087B2 (en) * | 2001-06-15 | 2004-08-17 | 3M Innovative Properties Company | Dual axis magnetic field EAS device |
| US7215250B2 (en) * | 2002-11-22 | 2007-05-08 | Sensormatic Electronics Corporation | Proximity detaching for electronic article surveillance tags |
| US7119691B2 (en) | 2003-10-17 | 2006-10-10 | Sensormatic Electronics Corporation | Electronic article surveillance marker deactivator using phase control deactivation |
| US6946962B2 (en) * | 2003-10-29 | 2005-09-20 | Sensormatic Electronics Corporation | Electronic article surveillance marker deactivator using inductive discharge |
| US7068172B2 (en) * | 2004-05-21 | 2006-06-27 | Xiao Hui Yang | Method and apparatus for deactivating an EAS device |
| GB2415865A (en) * | 2004-07-02 | 2006-01-04 | Redcliffe Ltd | Arrangement of demagnetising coil pairs for EAS tag deactivation unit |
| US20090212952A1 (en) * | 2008-02-22 | 2009-08-27 | Xiao Hui Yang | Method and apparatus for de-activating eas markers |
| US8890693B2 (en) | 2012-03-30 | 2014-11-18 | W G Security Products | Method and apparatus to deactivate EAS markers |
| EP3096708A4 (en) | 2014-01-24 | 2017-10-18 | Elucent Medical, Inc. | Systems and methods comprising localization agents |
| WO2017059228A1 (en) | 2015-10-02 | 2017-04-06 | Elucent Medical, Inc. | Signal tag detection components, devices, and systems |
| US9730764B2 (en) | 2015-10-02 | 2017-08-15 | Elucent Medical, Inc. | Signal tag detection components, devices, and systems |
| US10358045B2 (en) * | 2016-05-11 | 2019-07-23 | Witricity Corporation | Methods and apparatus for wirelessly transferring power |
| WO2018031826A1 (en) | 2016-08-12 | 2018-02-15 | Elucent Medical, Inc. | Surgical device guidance and monitoring devices, systems, and methods |
| US10278779B1 (en) | 2018-06-05 | 2019-05-07 | Elucent Medical, Inc. | Exciter assemblies |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4012742A (en) * | 1975-12-29 | 1977-03-15 | International Telephone And Telegraph Corporation | Multimode loop antenna |
| US4184163A (en) * | 1976-11-29 | 1980-01-15 | Rca Corporation | Broad band, four loop antenna |
| US4634975A (en) * | 1984-09-17 | 1987-01-06 | Progressive Dynamics, Inc. | Method and apparatus for producing electromagnetic surveillance fields |
| US4633250A (en) * | 1985-01-07 | 1986-12-30 | Allied Corporation | Coplanar antenna for proximate surveillance systems |
| US4769631A (en) * | 1986-06-30 | 1988-09-06 | Sensormatic Electronics Corporation | Method, system and apparatus for magnetic surveillance of articles |
| US4890115A (en) * | 1988-02-10 | 1989-12-26 | Monarch Marking Systems, Inc. | Magnetic antenna |
| GB8808933D0 (en) * | 1988-04-15 | 1988-05-18 | Scient Generics Ltd | Antipilferage system |
| US5061941A (en) * | 1990-02-01 | 1991-10-29 | Checkpoint Systems, Inc. | Composite antenna for electronic article surveillance systems |
| US5051726A (en) * | 1990-08-14 | 1991-09-24 | Sensormatic Electronics Corporation | Electronic article surveillance system with antenna array for enhanced field falloff |
| US5142292A (en) * | 1991-08-05 | 1992-08-25 | Checkpoint Systems, Inc. | Coplanar multiple loop antenna for electronic article surveillance systems |
| US5341125A (en) * | 1992-01-15 | 1994-08-23 | Sensormatic Electronics Corporation | Deactivating device for deactivating EAS dual status magnetic tags |
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-
1997
- 1997-02-03 US US08/794,012 patent/US5867101A/en not_active Expired - Lifetime
-
1998
- 1998-01-29 WO PCT/US1998/001815 patent/WO1998035878A2/en active IP Right Grant
- 1998-01-29 JP JP53577698A patent/JP2001511280A/en active Pending
- 1998-01-29 EP EP98904779A patent/EP0956548B1/en not_active Expired - Lifetime
- 1998-01-29 CA CA002279188A patent/CA2279188C/en not_active Expired - Fee Related
- 1998-01-29 DE DE69823009T patent/DE69823009T2/en not_active Expired - Lifetime
- 1998-01-29 BR BR9807819-4A patent/BR9807819A/en not_active Application Discontinuation
- 1998-01-29 AU AU62574/98A patent/AU730821B2/en not_active Expired
- 1998-02-03 AR ARP980100459A patent/AR011102A1/en unknown
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