EP0291726B1 - Alliage amorphe pour éléments détecteurs en forme de rubans - Google Patents
Alliage amorphe pour éléments détecteurs en forme de rubans Download PDFInfo
- Publication number
- EP0291726B1 EP0291726B1 EP88106558A EP88106558A EP0291726B1 EP 0291726 B1 EP0291726 B1 EP 0291726B1 EP 88106558 A EP88106558 A EP 88106558A EP 88106558 A EP88106558 A EP 88106558A EP 0291726 B1 EP0291726 B1 EP 0291726B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- amorphous alloy
- alloy
- shaped sensor
- sensor elements
- 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
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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
- C22C45/04—Amorphous alloys with nickel or cobalt as the major constituent
-
- 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
- G08B13/2437—Tag layered structure, processes for making layered tags
- G08B13/2442—Tag materials and material properties thereof, e.g. magnetic material details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
- H01F1/15316—Amorphous metallic alloys, e.g. glassy metals based on Co
Definitions
- the invention relates to an amorphous alloy according to the preamble of claim 1 and a strip-shaped sensor element.
- Narrow and thin strips of a well soft magnetic material are required for security labels. So far commercial strips made of both crystalline and amorphous material have been used. The usual dimensions here are strip widths less than 3 mm, strip thicknesses less than 40 ⁇ m and label lengths from 50 to 100 mm, in individual cases even less. It is important for the functioning of such strips that the material can be completely magnetized or re-magnetized with the smallest possible exciting magnetic fields. Due to the non-linearity of the magnetization curve of the strip when magnetic saturation is reached, when the magnetization is reversed in a corresponding receiver coil of an anti-theft system, z. B. harmonics of the excitation frequency are generated, which are used to detect the strip and thus a possible thief.
- the field strength H s which is necessary for the complete magnetization of the strip, is essentially determined by the geometry of the strip (magnetic shear effect) and the magnetic anisotropy energy transverse to the strip direction.
- H s is the geometry of the strip (magnetic shear effect) and the magnetic anisotropy energy transverse to the strip direction.
- w is the width
- t is the thickness
- 1 is the length of the strip
- B s is the saturation induction
- H A is the magnetic anisotropy field.
- the factor ⁇ also depends, albeit only very weakly, on the strip geometry and can essentially be regarded as constant.
- the magnetic excitation field strength in current systems must be about the order of magnitude or greater than the saturation field strength H s , if possible.
- H s saturation field strength
- z. B. to avoid false alarms by other ferromagnetic objects or for reasons of power requirements for the excitation field strength, to reduce unnecessary losses or heating, the excitation field strength should not be too large.
- the demagnetizing field in the strip direction is significantly reduced according to the equation. This has the desired effect that the magnetic stripe can be remagnetized in relatively small excitation fields and thus delivers the desired signal.
- the saturation field strength H s can be further reduced by making the anisotropy field H A almost disappear by special heat treatments.
- This is e.g. B. the case for magnetic material with an intrinsically rectangular magnetization loop, which is why such a material turned out to be particularly suitable in many cases.
- the invention has for its object to find an amorphous alloy with which, if necessary, the length of the strip-shaped sensor elements can be reduced in the sense of miniaturization, it must be ensured that the desired function can also be performed.
- This object is achieved by an amorphous alloy with the features of claim 1 and by the sensor element according to claim 5.
- the present invention is based on the knowledge that for such special applications the saturation field strength H s can be achieved not only by reducing the cross section but also by reducing the saturation magnetization.
- the known, commercially available alloys in the field of application according to the invention all have a saturation magnetization B s of greater than 0.5 T.
- B s saturation magnetization
- EP-OS 0 121 694 shows that the saturation magnetization is far greater than 0.5 T, and it is noted that it is particularly advantageous if the saturation magnetization has a value equal to or greater than 1 T .
- u 4 to 10 at.%
- X 35 to 45 at.%
- Y 0 to 1
- z 21 to 23 at.%.
- the attached table shows the results of a series of alloys which have been subjected to heat treatment in the longitudinal field. For economic reasons, such a heat treatment should not take too long, ie be shorter than about 1 day, and still be a remanence ratio B r / B s > 0.6 achieve.
- alloys 1 to 6 have a saturation induction in the desired range, but do not respond sufficiently to heat treatment at all temperatures used here (ie, no desired remanence ratio could be achieved B r / B s > 0.6 can be achieved).
- a number of alloys such as B. known, which respond well to heat treatment ( B r / B s > 0.6 accessible), but all of them B s > 0.5 T have and are out of the question for these desired applications.
- Alloys 7 to 11 are suitable, however l B s ⁇ 0.5 T. and B r / B s > 0.6 to reach.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Electromagnetism (AREA)
- Computer Security & Cryptography (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Dispersion Chemistry (AREA)
- Power Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Soft Magnetic Materials (AREA)
- Burglar Alarm Systems (AREA)
Claims (5)
- Alliage amorphe pour éléments détecteurs en forme de bandes, à faible induction de saturation, pour utilisation dans des étiquettes antivol ou des détecteurs de champ magnétiuqe, caractérisé en ce qu'il s'agit d'un alliage exempt de magnétostriction ayant une induction de saturation
Co100 - u - x - y - z Feu Nix Ty (SiB)z
u allant de 4 à 10 % en atomes
x allant de 20 à 50 % en atomes
y allant de o à 18 % en atomes
z allant de 5 à 30 % en atomes
et la condition
- Alliage amorphe selon la revendication 1, dans lequel u = 4 à 10 % en atomes, x = 35 à 45 % en atomes, y = 0 à 1, z = 21 à 23 % en atomes.
- Elément détecteur en forme de bande, à base d'un alliage selon l'une quelconque des revendications précédents, pour utilisation dans des étiquettes antivol ou des détecteurs de champ magnétique.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3717043 | 1987-05-21 | ||
DE19873717043 DE3717043A1 (de) | 1987-05-21 | 1987-05-21 | Amorphe legierung fuer streifenfoermige sensorelemente |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0291726A2 EP0291726A2 (fr) | 1988-11-23 |
EP0291726A3 EP0291726A3 (en) | 1989-07-05 |
EP0291726B1 true EP0291726B1 (fr) | 1993-06-23 |
Family
ID=6328040
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88106558A Expired - Lifetime EP0291726B1 (fr) | 1987-05-21 | 1988-04-23 | Alliage amorphe pour éléments détecteurs en forme de rubans |
Country Status (4)
Country | Link |
---|---|
US (1) | US5037494A (fr) |
EP (1) | EP0291726B1 (fr) |
JP (1) | JP3065085B2 (fr) |
DE (2) | DE3717043A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6313746B1 (en) | 1999-04-23 | 2001-11-06 | Vacuumschelmze Gmbh | Magnet marker strip and a method of producing a magnetic marker strip |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5015992A (en) * | 1989-06-29 | 1991-05-14 | Pitney Bowes Inc. | Cobalt-niobium amorphous ferromagnetic alloys |
US5015993A (en) * | 1989-06-29 | 1991-05-14 | Pitney Bowes Inc. | Ferromagnetic alloys with high nickel content and high permeability |
US5532598A (en) * | 1994-05-25 | 1996-07-02 | Westinghouse Electric Corporation | Amorphous metal tagging system for underground structures including elongated particles of amorphous metal embedded in nonmagnetic and nonconductive material |
US5800635A (en) * | 1995-06-15 | 1998-09-01 | Alliedsignal Inc. | Method of achieving a controlled step change in the magnetization loop of amorphous alloys |
DE19802349B4 (de) * | 1997-01-23 | 2010-04-15 | Alps Electric Co., Ltd. | Weichmagnetische amorphe Legierung, amorphe Legierung hoher Härte und ihre Verwendung |
US6432226B2 (en) | 1999-04-12 | 2002-08-13 | Alliedsignal Inc. | Magnetic glassy alloys for high frequency applications |
US6475303B1 (en) * | 1999-04-12 | 2002-11-05 | Honeywell International Inc. | Magnetic glassy alloys for electronic article surveillance |
ES2403177T3 (es) * | 2006-06-02 | 2013-05-16 | Société Plymouth Française | Sistema de detección, adaptado para la identificación y para el seguimiento de canalizaciones enterradas o de otros cuerpos enterrados en el suelo o embebidos en unas obras de ingeniería civil |
US7771545B2 (en) * | 2007-04-12 | 2010-08-10 | General Electric Company | Amorphous metal alloy having high tensile strength and electrical resistivity |
US9275529B1 (en) * | 2014-06-09 | 2016-03-01 | Tyco Fire And Security Gmbh | Enhanced signal amplitude in acoustic-magnetomechanical EAS marker |
US10989834B2 (en) | 2017-10-27 | 2021-04-27 | Energy & Environmental Research Center | Identifying subterranean structures using amorphous metal markers |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59582B2 (ja) * | 1976-03-23 | 1984-01-07 | 東北大学金属材料研究所長 | 磁歪が小さく耐摩耗性の大きい磁気ヘツド用非晶質合金およびその製造方法 |
US4188211A (en) * | 1977-02-18 | 1980-02-12 | Tdk Electronics Company, Limited | Thermally stable amorphous magnetic alloy |
JPS6037179B2 (ja) * | 1977-02-24 | 1985-08-24 | ティーディーケイ株式会社 | 非晶質磁性合金 |
US4225339A (en) * | 1977-12-28 | 1980-09-30 | Tokyo Shibaura Denki Kabushiki Kaisha | Amorphous alloy of high magnetic permeability |
US4439236A (en) * | 1979-03-23 | 1984-03-27 | Allied Corporation | Complex boride particle containing alloys |
USRE32428E (en) * | 1979-04-23 | 1987-05-26 | Allied Corporation | Amorphous antipilferage marker |
US4298862A (en) * | 1979-04-23 | 1981-11-03 | Allied Chemical Corporation | Amorphous antipilferage marker |
US4484184A (en) * | 1979-04-23 | 1984-11-20 | Allied Corporation | Amorphous antipilferage marker |
DE2924280A1 (de) * | 1979-06-15 | 1981-01-08 | Vacuumschmelze Gmbh | Amorphe weichmagnetische legierung |
JPS5931580B2 (ja) * | 1979-08-28 | 1984-08-02 | 東北金属工業株式会社 | 低保磁力・高角形性を有するアモルファス合金薄板の製造方法 |
JPS5754251A (en) * | 1980-09-15 | 1982-03-31 | Tdk Corp | Amorphous magnetic alloy material |
JPS57205872A (en) * | 1981-03-19 | 1982-12-17 | Toshiba Corp | Cassette tape |
JPS5831053A (ja) * | 1981-08-18 | 1983-02-23 | Toshiba Corp | 非晶質合金 |
EP0078401B1 (fr) * | 1981-11-02 | 1985-08-07 | Allied Corporation | Marqueur antivol amorphe |
EP0160166A1 (fr) * | 1981-11-26 | 1985-11-06 | Allied Corporation | Alliages de métal amorphes à magnétostriction basse |
US4553136A (en) * | 1983-02-04 | 1985-11-12 | Allied Corporation | Amorphous antipilferage marker |
JPS6070157A (ja) * | 1983-09-28 | 1985-04-20 | Toshiba Corp | 非晶質合金及びその製造方法 |
JPS6164861A (ja) * | 1984-09-06 | 1986-04-03 | Tohoku Metal Ind Ltd | 磁気損失が小さく高角形性を有するアモルフアス合金の製造方法 |
-
1987
- 1987-05-21 DE DE19873717043 patent/DE3717043A1/de not_active Withdrawn
-
1988
- 1988-04-23 DE DE8888106558T patent/DE3881962D1/de not_active Expired - Fee Related
- 1988-04-23 EP EP88106558A patent/EP0291726B1/fr not_active Expired - Lifetime
- 1988-05-17 JP JP63118417A patent/JP3065085B2/ja not_active Expired - Lifetime
-
1990
- 1990-05-15 US US07/523,176 patent/US5037494A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6313746B1 (en) | 1999-04-23 | 2001-11-06 | Vacuumschelmze Gmbh | Magnet marker strip and a method of producing a magnetic marker strip |
Also Published As
Publication number | Publication date |
---|---|
EP0291726A3 (en) | 1989-07-05 |
US5037494A (en) | 1991-08-06 |
DE3881962D1 (de) | 1993-07-29 |
DE3717043A1 (de) | 1988-12-15 |
EP0291726A2 (fr) | 1988-11-23 |
JPS63307238A (ja) | 1988-12-14 |
JP3065085B2 (ja) | 2000-07-12 |
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