WO1998026312A1 - Magnetic tags - Google Patents
Magnetic tags Download PDFInfo
- Publication number
- WO1998026312A1 WO1998026312A1 PCT/GB1997/003389 GB9703389W WO9826312A1 WO 1998026312 A1 WO1998026312 A1 WO 1998026312A1 GB 9703389 W GB9703389 W GB 9703389W WO 9826312 A1 WO9826312 A1 WO 9826312A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tag
- magnetically active
- active elements
- magnetic
- elements
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V15/00—Tags attached to, or associated with, an object, in order to enable detection of the object
Definitions
- PCT/GB96/00823 (WO96/31790) and PCT/GB96/00367 (W097/04338) , we have described and claimed novel techniques for spatial magnetic interrogation and novel magnetic tags.
- the technology described in WO96/31790 is based on exploiting the behaviour of magnetic materials as they pass through a region of space containing a magnetic null.
- these earlier applications describe, inter alia, how passive tags containing one or more magnetic elements can perform as remotely-readable data carriers, the number and spatial arrangement of the elements representing information.
- the present application relates to certain types of magnetic tag which are expected to find use in detection/interrogation systems of the type described in the earlier patent applications mentioned above, but also in other systems.
- a generally rectangular magnetic tag having a major axis and a minor axis
- which tag comprises a plurality of magnetically active elements supported on or by a substrate, the magnetically active elements displaying or being capable of displaying magnetic anisotropy, characterised in that the magnetically active elements are generally linear and have an axis of easy magnetisation along their length, and in that said elements are disposed so as to transect the major axis of the tag.
- the magnetic elements will be disposed parallel to the minor axis of the tag.
- a tag of this form can be read using a quadrupole magnetic field.
- a quadrupole magnetic field For example, satisfactory results have been obtained using an interrogation system of the sort described in PCT/GB96/00823 (published as WO 96/31790), with a 2D quadrupole field gradient of 2kA/m/m, an AC drive of 30 A/m rms at 6.25kHz, using second harmonic detection at 12.5kHz; the tags included a plurality of magnetic elements formed from vacuumschmeltze ' s 6025 spin melt ribbon, each element having dimensions (in millimetres) of 32 x 0.8 x 0.025.
- the tag is moved through the interrogating field in the direction of its major axis. For best operation, the plane of the tag should be located within 30° of the quadrupole axis.
- a magnetic tag which comprises a plurality of magnetically active elements supported on or by a substrate, the magnetically active elements displaying or being capable of displaying magnetic anisotropy, characterised in that the magnetically active elements are generally linear and have an axis of easy magnetisation along their length, and in that said elements are disposed so as to transect one another.
- the tag is generally circular; in this case, the magnetic elements, or at least some of them, intersect one another at the centre of the circle. In one particular embodiment, all of the magnetic elements are disposed as diameters of the circle. In another embodiment, the tag is in the form of a sphere or a spheroid and the magnetic elements are disposed as diameters of the sphere or spheroid.
- the interrogation system uses a rotating scanned field of fixed magnitude 300 A/m, rotating at 16.66 Hz.
- the magnetic strips have dimensions (in millimetres) of 32 x 0.8 x 0.025 and are radially spaced by at least 6°.
- the interrogation system can be the same as that described above in relation to the first aspect of the invention.
- Spherical arrays where the magnetic elements are disposed as diameters of a sphere, are preferably such that the average strip spacing subtends an angle of about 9 ° at the notional centre of the sphere .
- a tag can have, for example, 252 magnetic strips.
- Fig. 1 shows a tag of the first (rectangular) kind
- Fig. 2 shows a tag of the second ("petal") kind.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002274552A CA2274552A1 (en) | 1996-12-09 | 1997-12-09 | Magnetic tags |
JP52635698A JP2001506004A (en) | 1996-12-09 | 1997-12-09 | Magnetic tags |
BR9713892-4A BR9713892A (en) | 1996-12-09 | 1997-12-09 | Magnetic labels. |
EP97949015A EP0943107A1 (en) | 1996-12-09 | 1997-12-09 | Magnetic tags |
AU78500/98A AU7850098A (en) | 1996-12-09 | 1997-12-09 | Magnetic tags |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9625561.7 | 1996-12-09 | ||
GBGB9625561.7A GB9625561D0 (en) | 1996-12-09 | 1996-12-09 | Magnetic tags |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998026312A1 true WO1998026312A1 (en) | 1998-06-18 |
Family
ID=10804176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1997/003389 WO1998026312A1 (en) | 1996-12-09 | 1997-12-09 | Magnetic tags |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0943107A1 (en) |
JP (1) | JP2001506004A (en) |
CN (1) | CN1244261A (en) |
AU (1) | AU7850098A (en) |
BR (1) | BR9713892A (en) |
CA (1) | CA2274552A1 (en) |
GB (1) | GB9625561D0 (en) |
WO (1) | WO1998026312A1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999023741A1 (en) * | 1997-10-30 | 1999-05-14 | Flying Null Limited | Magnetic field generation |
WO2000010123A1 (en) * | 1998-08-14 | 2000-02-24 | Flying Null Limited | Magnetic information carriers |
WO2001013329A1 (en) * | 1999-08-16 | 2001-02-22 | Flying Null Limited | Information coding techniques |
GB2359962A (en) * | 1999-10-01 | 2001-09-05 | Sentec Ltd | Magnetic tags with increased data storage |
US6317044B1 (en) | 1996-09-05 | 2001-11-13 | Key-Track, Inc. | Inventoriable object control and tracking system |
US6392543B2 (en) | 1998-09-11 | 2002-05-21 | Key-Trak, Inc. | Mobile object tracking system |
US6407665B2 (en) | 1998-09-11 | 2002-06-18 | Key-Trak, Inc. | Object tracking system with non-contact object detection and identification |
US6427913B1 (en) | 1998-09-11 | 2002-08-06 | Key-Trak, Inc. | Object control and tracking system with zonal transition detection |
US6501379B2 (en) | 1998-09-11 | 2002-12-31 | Key-Trak, Inc. | Object carriers for an object control and tracking system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100417936C (en) * | 2003-03-21 | 2008-09-10 | 博奥生物有限公司 | Micro device with magnetic shaft and its using method |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0295085A1 (en) * | 1987-06-08 | 1988-12-14 | Esselte Meto International GmbH | Article detection and/or recognition using magnetic devices |
US5017907A (en) * | 1990-01-16 | 1991-05-21 | Pitney Bowes Inc. | Double pulse magnetic markers |
EP0756255A1 (en) * | 1995-07-27 | 1997-01-29 | Esselte Meto International GmbH | Deactivatable security tag and method and device for its manufacturing |
GB2312595A (en) * | 1996-04-23 | 1997-10-29 | Flying Null Ltd | Magnetically coded tag or marker |
-
1996
- 1996-12-09 GB GBGB9625561.7A patent/GB9625561D0/en active Pending
-
1997
- 1997-12-09 EP EP97949015A patent/EP0943107A1/en not_active Withdrawn
- 1997-12-09 WO PCT/GB1997/003389 patent/WO1998026312A1/en not_active Application Discontinuation
- 1997-12-09 JP JP52635698A patent/JP2001506004A/en active Pending
- 1997-12-09 AU AU78500/98A patent/AU7850098A/en not_active Abandoned
- 1997-12-09 CN CN 97181285 patent/CN1244261A/en active Pending
- 1997-12-09 BR BR9713892-4A patent/BR9713892A/en not_active Application Discontinuation
- 1997-12-09 CA CA002274552A patent/CA2274552A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0295085A1 (en) * | 1987-06-08 | 1988-12-14 | Esselte Meto International GmbH | Article detection and/or recognition using magnetic devices |
US5017907A (en) * | 1990-01-16 | 1991-05-21 | Pitney Bowes Inc. | Double pulse magnetic markers |
EP0756255A1 (en) * | 1995-07-27 | 1997-01-29 | Esselte Meto International GmbH | Deactivatable security tag and method and device for its manufacturing |
GB2312595A (en) * | 1996-04-23 | 1997-10-29 | Flying Null Ltd | Magnetically coded tag or marker |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6707380B2 (en) | 1995-09-08 | 2004-03-16 | Key-Trak, Inc. | Inventoriable-object control and tracking system |
US6317044B1 (en) | 1996-09-05 | 2001-11-13 | Key-Track, Inc. | Inventoriable object control and tracking system |
GB2347022A (en) * | 1997-10-30 | 2000-08-23 | Flying Null Ltd | Magnetic field generation |
WO1999023741A1 (en) * | 1997-10-30 | 1999-05-14 | Flying Null Limited | Magnetic field generation |
WO2000010123A1 (en) * | 1998-08-14 | 2000-02-24 | Flying Null Limited | Magnetic information carriers |
US6424260B2 (en) | 1998-09-11 | 2002-07-23 | Key-Trak, Inc. | Mobile object tracking system |
US6392543B2 (en) | 1998-09-11 | 2002-05-21 | Key-Trak, Inc. | Mobile object tracking system |
US6407665B2 (en) | 1998-09-11 | 2002-06-18 | Key-Trak, Inc. | Object tracking system with non-contact object detection and identification |
US6427913B1 (en) | 1998-09-11 | 2002-08-06 | Key-Trak, Inc. | Object control and tracking system with zonal transition detection |
US6501379B2 (en) | 1998-09-11 | 2002-12-31 | Key-Trak, Inc. | Object carriers for an object control and tracking system |
US6693538B2 (en) | 1998-09-11 | 2004-02-17 | Key-Trak, Inc. | Object carriers for an object control and tracking system |
WO2001013329A1 (en) * | 1999-08-16 | 2001-02-22 | Flying Null Limited | Information coding techniques |
US6889906B1 (en) | 1999-08-16 | 2005-05-10 | Flying Null Limited | Information coding techniques |
GB2359962B (en) * | 1999-10-01 | 2002-06-12 | Sentec Ltd | Magnetic tags |
GB2359962A (en) * | 1999-10-01 | 2001-09-05 | Sentec Ltd | Magnetic tags with increased data storage |
Also Published As
Publication number | Publication date |
---|---|
JP2001506004A (en) | 2001-05-08 |
GB9625561D0 (en) | 1997-01-29 |
BR9713892A (en) | 2000-02-29 |
EP0943107A1 (en) | 1999-09-22 |
CN1244261A (en) | 2000-02-09 |
CA2274552A1 (en) | 1998-06-18 |
AU7850098A (en) | 1998-07-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA1301881C (en) | Electromagnetic identification system | |
EP0939911B1 (en) | Magnetic interrogation techniques | |
CA2258772C (en) | Magnetic reading devices | |
CA1301882C (en) | Electromagnetic identification system | |
EP0943107A1 (en) | Magnetic tags | |
US4158434A (en) | Electronic status determining system for goods | |
JP6719378B2 (en) | Magnetic bar code chip and reading method thereof | |
CN1332363C (en) | Dual axle magnetic field device for changing status of EAS marker | |
EP0713195B1 (en) | Remote identification system | |
AU717142B2 (en) | Magnetic tags | |
CA2057436C (en) | Deactivatable electronic article surveillance markers using short semi-hard magnetic wires and method of making same | |
KR910007697A (en) | Improved financial cards | |
US5949318A (en) | Apparatus for activating/deactivating sensors used with EAS tags | |
WO1998015853A2 (en) | Multi-bit magnetic tag and its method of manufacture | |
GB2334183A (en) | Programmable magnetic data tag | |
WO2000010123A1 (en) | Magnetic information carriers | |
EP0366335A2 (en) | Magnetic identifier | |
US3465307A (en) | Anisotropic magnetic thin film memory apparatus | |
WO2000039611A1 (en) | Reading devices for magnetic tags | |
US5246522A (en) | Method of making deactivatable electronic article surveillance markers | |
CN213838368U (en) | Multi-antenna safety door device and safety door detection system | |
GB2314418A (en) | Sensing the presence of a magnetic tag | |
WO2002049012A3 (en) | Device for scanning an electromagnetically suspended information carrier | |
EP1218852A1 (en) | Magnetic tags | |
JPH04145393A (en) | Magnetic security system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 97181285.3 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE GH GM HU ID IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG US UZ VN YU ZW AM AZ BY KG KZ MD RU TJ TM |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW SD SZ UG ZW AT BE CH DE DK ES FI FR GB GR IE IT |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
ENP | Entry into the national phase |
Ref document number: 2274552 Country of ref document: CA Ref document number: 2274552 Country of ref document: CA Kind code of ref document: A Ref document number: 1998 526356 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1997949015 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 78500/98 Country of ref document: AU |
|
WWE | Wipo information: entry into national phase |
Ref document number: 09319578 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 1997949015 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1997949015 Country of ref document: EP |