GB1534859A - Detector for documents comprising magnetizable material - Google Patents

Detector for documents comprising magnetizable material

Info

Publication number
GB1534859A
GB1534859A GB11421/75A GB1142175A GB1534859A GB 1534859 A GB1534859 A GB 1534859A GB 11421/75 A GB11421/75 A GB 11421/75A GB 1142175 A GB1142175 A GB 1142175A GB 1534859 A GB1534859 A GB 1534859A
Authority
GB
United Kingdom
Prior art keywords
polarity
coercivity
articles
magnetizable material
documents
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
Application number
GB11421/75A
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.)
De la Rue Crosfield Ltd
Original Assignee
De la Rue Crosfield Ltd
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 De la Rue Crosfield Ltd filed Critical De la Rue Crosfield Ltd
Priority to GB11421/75A priority Critical patent/GB1534859A/en
Publication of GB1534859A publication Critical patent/GB1534859A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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

Abstract

1534859 Detector for magnetizable material DE LA RUE CROSFIELD Ltd 4 June 1976 [19 Sept 1975] 11421/75 Heading G4M Articles carrying a magnetizable material having a magnetic coercivity above or below a predetermined value are identified by determining whether the coercivity is above or below the value. The magnetizable material is subjected<SP>8</SP> to a first magnetizing field sufficient to saturate the material having the higher coercivity and is then subjected<SP>9</SP> to a second field of opposite polarity with a sufficient strength to reverse the polarity of the material having the lower coercivity but insufficient strength to reverse the polarity of the material having the higher coercivity. The polarity of the magnetized material is then detected<SP>11</SP> and used to operate a deflector 19 to sort the articles. The number of articles having each polarity may be counted A, B. The recorded signal is read by head 11, shaped and amplified by amplifier 13 and fed to adjustable upper 14 and lower 16 limit detectors. The detectors feed respective gates 15 and monostables cross coupled to the gates. The documents are driven at a constant speed by rollers 7 and electric motor M.
GB11421/75A 1976-06-04 1976-06-04 Detector for documents comprising magnetizable material Expired GB1534859A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB11421/75A GB1534859A (en) 1976-06-04 1976-06-04 Detector for documents comprising magnetizable material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11421/75A GB1534859A (en) 1976-06-04 1976-06-04 Detector for documents comprising magnetizable material

Publications (1)

Publication Number Publication Date
GB1534859A true GB1534859A (en) 1978-12-06

Family

ID=9985916

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11421/75A Expired GB1534859A (en) 1976-06-04 1976-06-04 Detector for documents comprising magnetizable material

Country Status (1)

Country Link
GB (1) GB1534859A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2536187A1 (en) * 1982-11-17 1984-05-18 Crouzet Sa Anti-fraud reader for magnetic data media.
FR2561427A1 (en) * 1984-03-13 1985-09-20 Crouzet Sa Method of identifying the nature of a magnetisable support.
EP0208157A1 (en) * 1985-06-12 1987-01-14 Siemens Nixdorf Informationssysteme Aktiengesellschaft Device for detecting and testing a magnetic-layer carrier
EP0355162A4 (en) * 1987-04-17 1990-01-29 Kyodo Printing Co Ltd Magnetic recording medium.
EP0428779A1 (en) * 1989-11-23 1991-05-29 MANTEGAZZA ANTONIO ARTI GRAFICHE S.r.l. Identification code for documents and the like and unit for sensing magnetic codes
EP1770657A2 (en) 2005-09-30 2007-04-04 De La Rue International Limited Method and apparatus for detecting a magnetic feature on an article

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2536187A1 (en) * 1982-11-17 1984-05-18 Crouzet Sa Anti-fraud reader for magnetic data media.
FR2561427A1 (en) * 1984-03-13 1985-09-20 Crouzet Sa Method of identifying the nature of a magnetisable support.
EP0208157A1 (en) * 1985-06-12 1987-01-14 Siemens Nixdorf Informationssysteme Aktiengesellschaft Device for detecting and testing a magnetic-layer carrier
EP0355162A4 (en) * 1987-04-17 1990-01-29 Kyodo Printing Co Ltd Magnetic recording medium.
EP0355162A1 (en) * 1987-04-17 1990-02-28 Kyodo Printing Co., Ltd. Magnetic recording medium
US4982076A (en) * 1987-04-17 1991-01-01 Kyodo Printing Co., Ltd. Magnetic recording medium
AU609475B2 (en) * 1987-04-17 1991-05-02 Kyodo Printing Co., Ltd. Magnetic recording medium
EP0428779A1 (en) * 1989-11-23 1991-05-29 MANTEGAZZA ANTONIO ARTI GRAFICHE S.r.l. Identification code for documents and the like and unit for sensing magnetic codes
EP1770657A2 (en) 2005-09-30 2007-04-04 De La Rue International Limited Method and apparatus for detecting a magnetic feature on an article
EP1770657A3 (en) * 2005-09-30 2008-01-23 De La Rue International Limited Method and apparatus for detecting a magnetic feature on an article

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee