DE69224995T2 - Ungeschirmter magnetoresistiver kopf mit mehreren paaren von sensorelementen - Google Patents

Ungeschirmter magnetoresistiver kopf mit mehreren paaren von sensorelementen

Info

Publication number
DE69224995T2
DE69224995T2 DE69224995T DE69224995T DE69224995T2 DE 69224995 T2 DE69224995 T2 DE 69224995T2 DE 69224995 T DE69224995 T DE 69224995T DE 69224995 T DE69224995 T DE 69224995T DE 69224995 T2 DE69224995 T2 DE 69224995T2
Authority
DE
Germany
Prior art keywords
sensor elements
several pairs
magnetoresistive head
unshielded magnetoresistive
unshielded
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 - Fee Related
Application number
DE69224995T
Other languages
English (en)
Other versions
DE69224995D1 (de
Inventor
Robert Jones
Mark Howard Kryder
Keith Mountfield
Javier Guzman
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.)
Mars Inc
Original Assignee
Mars 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 Mars Inc filed Critical Mars Inc
Publication of DE69224995D1 publication Critical patent/DE69224995D1/de
Application granted granted Critical
Publication of DE69224995T2 publication Critical patent/DE69224995T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
    • G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
    • G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
    • G11B5/3967—Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read
    • G11B5/397—Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read with a plurality of independent magnetoresistive active read-out elements for respectively transducing from selected components
    • G11B5/3974—Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read with a plurality of independent magnetoresistive active read-out elements for respectively transducing from selected components from the same information track, e.g. frequency bands
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
    • G01R33/09—Magnetoresistive devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
    • G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
    • G06K7/087—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors flux-sensitive, e.g. magnetic, detectors
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/20—Testing patterns thereon
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/09—Digital recording
DE69224995T 1991-10-29 1992-10-28 Ungeschirmter magnetoresistiver kopf mit mehreren paaren von sensorelementen Expired - Fee Related DE69224995T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/784,582 US5378885A (en) 1991-10-29 1991-10-29 Unshielded magnetoresistive head with multiple pairs of sensing elements
PCT/US1992/009141 WO1993009532A1 (en) 1991-10-29 1992-10-28 Unshielded magnetoresistive head with multiple pairs of sensing elements

Publications (2)

Publication Number Publication Date
DE69224995D1 DE69224995D1 (de) 1998-05-07
DE69224995T2 true DE69224995T2 (de) 1998-12-10

Family

ID=25132902

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69224995T Expired - Fee Related DE69224995T2 (de) 1991-10-29 1992-10-28 Ungeschirmter magnetoresistiver kopf mit mehreren paaren von sensorelementen

Country Status (6)

Country Link
US (1) US5378885A (de)
EP (1) EP0610383B1 (de)
JP (1) JPH07500940A (de)
DE (1) DE69224995T2 (de)
ES (1) ES2113960T3 (de)
WO (1) WO1993009532A1 (de)

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Publication number Priority date Publication date Assignee Title
DE69331895T2 (de) * 1992-12-29 2002-12-19 Eastman Kodak Co Magnetoresistiver Magnetfeldsensor mit sehr langem Wirkbereich
US5576908A (en) * 1994-04-01 1996-11-19 International Business Machines Corporation Actuator and file level initialization of magnetoresistive transducers
JP3258245B2 (ja) * 1996-11-27 2002-02-18 キヤノン電子株式会社 硬貨識別装置
US6469873B1 (en) * 1997-04-25 2002-10-22 Hitachi, Ltd. Magnetic head and magnetic storage apparatus using the same
EP0940778B1 (de) * 1998-02-19 2003-12-10 Innovative Technology Limited Banknotenechtheitsprüfer
JP2000293813A (ja) * 1999-04-08 2000-10-20 Sankyo Seiki Mfg Co Ltd 多チャンネル磁気ヘッド及びその製造方法及びそれを用いた磁気カードリーダ
JP4386498B2 (ja) * 1999-06-23 2009-12-16 株式会社ルネサステクノロジ 差動増幅回路
CN1201290C (zh) * 2000-05-25 2005-05-11 西加特技术有限责任公司 记录头上的改进的研磨的传感器
JP2002198583A (ja) * 2000-12-26 2002-07-12 Hitachi Ltd 強磁性トンネル型磁気抵抗効果素子及び磁気ヘッド
GB0100451D0 (en) * 2001-01-08 2001-02-21 Rue De Int Ltd Method for reading coded magnetic threads
ATE254782T1 (de) * 2001-01-08 2003-12-15 Rue De Int Ltd Magnetisches fadenlesegerät
GB0112783D0 (en) * 2001-05-25 2001-07-18 Rue De Int Ltd Magnetic field sensor and method
DE102006055169A1 (de) * 2006-11-22 2008-05-29 Giesecke & Devrient Gmbh Sicherheitselement für Wertdokumente
DE102007025939A1 (de) * 2007-06-04 2008-12-11 Giesecke & Devrient Gmbh Sicherheitselement zur Absicherung von Wertdokumenten
US8320856B2 (en) * 2009-06-09 2012-11-27 Broadcom Corporation Method and system for a leaky wave antenna as a load on a power amplifier
DE102011110138A1 (de) * 2011-08-15 2013-02-21 Meas Deutschland Gmbh Messvorrichtung zum Messen magnetischer Eigenschaften der Umgebung der Messvorrichtung
WO2014033904A1 (ja) * 2012-08-31 2014-03-06 株式会社日立製作所 磁気抵抗センサ、グラジオメータ
US9218822B1 (en) 2015-05-13 2015-12-22 HGST Netherlands B.V. Disk drive with preamplifier with isolation for multiple readers in a slider with a common return signal
WO2018011931A1 (ja) * 2016-07-14 2018-01-18 株式会社デンソー 回転検出装置

Family Cites Families (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881191A (en) * 1972-05-19 1975-04-29 Ibm Three-gap magnetic recording head having a single flux sensing means
CH581359A5 (de) * 1974-10-01 1976-10-29 Grey Lab Establishment
AT362658B (de) * 1978-03-15 1981-06-10 Oesterr Nationalbank Papier, verfahren zur pruefung von papieren und vorrichtung zur durchfuehrung des pruefverfahrens
CH624220A5 (de) * 1978-04-04 1981-07-15 Radioelectrique Comp Ind
DE3216830C2 (de) * 1981-05-09 1985-11-07 Laurel Bank Machines Co., Ltd., Tokio/Tokyo Banknoten-Ein/Ausgabe-Vorrichtung
JPS5829085A (ja) * 1981-07-24 1983-02-21 富士通株式会社 紙幣鑑別方式
FR2528970B1 (fr) * 1982-06-22 1985-09-27 Flonic Sa Dispositif de verification d'epaisseur de matieres dielectriques en feuille
US4523330A (en) * 1982-12-23 1985-06-11 Ncr Canada Ltd - Ncr Canada Ltee Banking system and method
US4588292A (en) * 1983-05-16 1986-05-13 Rowe International, Inc. Universal document validator
KR890002004B1 (ko) * 1984-01-11 1989-06-07 가부시끼 가이샤 도오시바 지폐류 판별장치
FR2559293B1 (fr) * 1984-02-03 1988-09-09 Commissariat Energie Atomique Nouvelle tete magnetique d'ecriture et de lecture pour enregistrement magnetique et son procede de fabrication
US4703378A (en) * 1984-03-01 1987-10-27 Sony Corporation Magnetic transducer head utilizing magnetoresistance effect
US4628194A (en) * 1984-10-10 1986-12-09 Mars, Inc. Method and apparatus for currency validation
CH661603A5 (en) * 1985-01-11 1987-07-31 Sodeco Compteurs De Geneve Apparatus for authenticating and identifying valuable documents, especially bank notes
GB8514391D0 (en) * 1985-06-07 1985-07-10 De La Rue Thomas & Co Ltd Authenticity sensing
US4841398A (en) * 1987-02-17 1989-06-20 Magnetic Peripherals Inc. Non linear magnetoresistive sensor
SE458315B (sv) * 1987-06-12 1989-03-13 Inter Innovation Ab Anordning foer detektering av dokument
DE3802121C2 (de) * 1988-01-26 1996-11-28 Nsm Ag Verfahren und Vorrichtung zur Bestimmung der Höhe eines Münzstapels in einem Münzrohr
US4988850A (en) * 1988-05-25 1991-01-29 Murata Mfg. Co., Ltd. Magnetoresistance element array
US5157245A (en) * 1988-06-29 1992-10-20 Murata Mfg. Co., Ltd. Magnetic sensor
US5001586A (en) * 1989-08-01 1991-03-19 International Business Machines Corporation Very low noise magnetoresistive sensor for high density media applications
FR2658647B1 (fr) * 1990-02-21 1992-04-30 Commissariat Energie Atomique Tete magnetique horizontale a effet hall et son procede de realisation.
US5084794A (en) * 1990-03-29 1992-01-28 Eastman Kodak Company Shorted dual element magnetoresistive reproduce head exhibiting high density signal amplification
US5155643A (en) * 1990-10-30 1992-10-13 Mars Incorporated Unshielded horizontal magnetoresistive head and method of fabricating same
US5159513A (en) * 1991-02-08 1992-10-27 International Business Machines Corporation Magnetoresistive sensor based on the spin valve effect

Also Published As

Publication number Publication date
US5378885A (en) 1995-01-03
DE69224995D1 (de) 1998-05-07
EP0610383B1 (de) 1998-04-01
EP0610383A1 (de) 1994-08-17
JPH07500940A (ja) 1995-01-26
ES2113960T3 (es) 1998-05-16
EP0610383A4 (en) 1995-12-27
WO1993009532A1 (en) 1993-05-13

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee