DE69520642D1 - Permanentmagnetanordnung mit einem driftkompensierten magnetoresistiven Fühler - Google Patents

Permanentmagnetanordnung mit einem driftkompensierten magnetoresistiven Fühler

Info

Publication number
DE69520642D1
DE69520642D1 DE69520642T DE69520642T DE69520642D1 DE 69520642 D1 DE69520642 D1 DE 69520642D1 DE 69520642 T DE69520642 T DE 69520642T DE 69520642 T DE69520642 T DE 69520642T DE 69520642 D1 DE69520642 D1 DE 69520642D1
Authority
DE
Germany
Prior art keywords
drift
compensated
permanent magnet
magnet arrangement
magnetoresistive sensor
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
Application number
DE69520642T
Other languages
English (en)
Other versions
DE69520642T2 (de
Inventor
Frederick John Jeffers
Neil Smith
Jay Davis Freeman
Kent Raphael Gandola
Peter Vandersalm Koeppe
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of DE69520642D1 publication Critical patent/DE69520642D1/de
Application granted granted Critical
Publication of DE69520642T2 publication Critical patent/DE69520642T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
    • G01R33/1207—Testing individual magnetic storage devices, e.g. records carriers or digital storage elements
    • 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
    • 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
    • G01R33/096—Magnetoresistive devices anisotropic magnetoresistance sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/081—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices the magnetic field is produced by the objects or geological structures
    • 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
    • G06K7/083—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 inductive
    • G06K7/084—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 inductive sensing magnetic material by relative movement detecting flux changes without altering its magnetised state
    • 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
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F7/00—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus
    • G07F7/08—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means
    • G07F7/086—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means by passive credit-cards adapted therefor, e.g. constructive particularities to avoid counterfeiting, e.g. by inclusion of a physical or chemical security-layer

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geophysics (AREA)
  • Electromagnetism (AREA)
  • Computer Security & Cryptography (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Measuring Magnetic Variables (AREA)
  • Magnetic Heads (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Hall/Mr Elements (AREA)
DE69520642T 1994-10-28 1995-10-06 Permanentmagnetanordnung mit einem magnetoresistiven MR Sensorelement Expired - Lifetime DE69520642T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/330,639 US5532584A (en) 1993-08-31 1994-10-28 MR sensor including calibration circuit wherein signals are averaged for determining a correction factor and pole pieces are shaped to reduce field in gap therebetween

Publications (2)

Publication Number Publication Date
DE69520642D1 true DE69520642D1 (de) 2001-05-17
DE69520642T2 DE69520642T2 (de) 2001-10-11

Family

ID=23290637

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69520642T Expired - Lifetime DE69520642T2 (de) 1994-10-28 1995-10-06 Permanentmagnetanordnung mit einem magnetoresistiven MR Sensorelement

Country Status (4)

Country Link
US (1) US5532584A (de)
EP (1) EP0709695B1 (de)
JP (1) JPH08235501A (de)
DE (1) DE69520642T2 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09260742A (ja) * 1996-03-26 1997-10-03 Sony Corp 磁気抵抗効果素子
US5946169A (en) * 1996-11-07 1999-08-31 Seagate Technology, Inc. Soft adjacent layer vertically biased magnetoresistive sensor having improved sensor stability
US6356420B1 (en) 1998-05-07 2002-03-12 Seagate Technology Llc Storage system having read head utilizing GMR and AMr effects
DE10113131B4 (de) * 2001-03-17 2006-11-16 Sensitec Gmbh Anordnung zur Messung der magnetischen Feldstärke oder von örtlichen Differenzen magnetischer Feldstärken, sowie Schaltungsanordnung für die Auswerteeinheit und Verwendungen der Anordnung und der Schaltungsanordnung
US7289924B2 (en) * 2005-07-20 2007-10-30 Honeywell International Inc. Self-calibrating sensor
IT1403421B1 (it) * 2010-12-23 2013-10-17 St Microelectronics Srl Sensore magnetoresistivo integrato, in particolare sensore magnetoresistivo triassiale e suo procedimento di fabbricazione
EP3171190B1 (de) * 2015-11-18 2021-08-25 Nxp B.V. Magnetfeldsensor
JP6974897B2 (ja) * 2016-04-19 2021-12-01 キヤノン電子株式会社 磁気識別装置
US10353019B2 (en) * 2016-07-18 2019-07-16 Apple Inc. High dynamic range magnetometer architecture
CN208888915U (zh) * 2017-09-07 2019-05-21 东芝泰格有限公司 磁性墨水读取装置以及打印机
TWI693418B (zh) 2019-03-22 2020-05-11 宇能電科技股份有限公司 校正磁場產生裝置及其具有自我校正磁場能力的磁場感測器與校正方法

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796859A (en) * 1971-12-27 1974-03-12 Ibm Magnetic ink recording system to both magnetize and read ink
GB1519142A (en) * 1974-07-04 1978-07-26 Emi Ltd Detection of magnetic patterns
US4048557A (en) * 1975-11-17 1977-09-13 Rockwell International Corporation Planar magnetoresistance thin film probe for magnetic field alignment
US4523243A (en) * 1982-05-24 1985-06-11 Storage Technology Corporation Magnetoresistive transducer using an independent recessed electromagnetic bias
US4667157A (en) * 1984-04-03 1987-05-19 The Babcock & Wilcox Company Linear Hall effect oxygen sensor with auxiliary coil magnetic field balancing
JPS61214205A (ja) * 1985-03-20 1986-09-24 Sony Corp ヨ−ク型磁気抵抗効果型磁気ヘツド
US5159511A (en) * 1987-04-01 1992-10-27 Digital Equipment Corporation Biasing conductor for MR head
US5111352A (en) * 1987-07-29 1992-05-05 Digital Equipment Corporation Three-pole magnetic head with reduced flux leakage
US4873655A (en) * 1987-08-21 1989-10-10 Board Of Regents, The University Of Texas System Sensor conditioning method and apparatus
ES2039019T3 (es) * 1988-04-21 1993-08-16 Landis & Gyr Business Support Ag Circuito semiconductor integrado con un sensor de campo magnetico hecho de material semiconductor.
US5068519A (en) * 1990-01-10 1991-11-26 Brandt, Inc. Magnetic document validator employing remanence and saturation measurements
US5247278A (en) * 1991-11-26 1993-09-21 Honeywell Inc. Magnetic field sensing device
US5301080A (en) * 1992-12-31 1994-04-05 International Business Machines Corporation Bias servo loop for magneto-resistive read/write head
US5418458A (en) * 1993-08-31 1995-05-23 Eastman Kodak Company Apparatus and method for authentication of documents printed with magnetic ink
AU2020228633A1 (en) 2019-02-26 2021-09-30 Niagara Bottling, Llc Nozzle for blow-molding stepped finish preform

Also Published As

Publication number Publication date
EP0709695B1 (de) 2001-04-11
JPH08235501A (ja) 1996-09-13
EP0709695A2 (de) 1996-05-01
DE69520642T2 (de) 2001-10-11
EP0709695A3 (de) 1997-10-15
US5532584A (en) 1996-07-02

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8328 Change in the person/name/address of the agent

Representative=s name: BLICKLE, K., DIPL.-ING., PAT.-ASS., 70327 STUTTGAR

8328 Change in the person/name/address of the agent

Representative=s name: DR. KUEHNER, H., RECHTSANW., 70327 STUTTGART