DE2545421B2 - - Google Patents

Info

Publication number
DE2545421B2
DE2545421B2 DE2545421A DE2545421A DE2545421B2 DE 2545421 B2 DE2545421 B2 DE 2545421B2 DE 2545421 A DE2545421 A DE 2545421A DE 2545421 A DE2545421 A DE 2545421A DE 2545421 B2 DE2545421 B2 DE 2545421B2
Authority
DE
Germany
Prior art keywords
recording medium
particles
directions
recording
layer
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.)
Granted
Application number
DE2545421A
Other languages
German (de)
English (en)
Other versions
DE2545421C3 (de
DE2545421A1 (de
Inventor
Cyril Arthur Maidenhead Berkshire Lee (Ver. Koenigreich)
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.)
EMI Ltd HAYES MIDDLESEX (VER KOENIGREICH)
Original Assignee
EMI Ltd HAYES MIDDLESEX (VER KOENIGREICH)
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 EMI Ltd HAYES MIDDLESEX (VER KOENIGREICH) filed Critical EMI Ltd HAYES MIDDLESEX (VER KOENIGREICH)
Publication of DE2545421A1 publication Critical patent/DE2545421A1/de
Publication of DE2545421B2 publication Critical patent/DE2545421B2/de
Application granted granted Critical
Publication of DE2545421C3 publication Critical patent/DE2545421C3/de
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
    • G06K1/12—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
    • G06K1/125—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching by magnetic means
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/08—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
    • G06K19/10—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
    • G06K19/12—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being sensed by magnetic means
    • 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)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Magnetic Record Carriers (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Credit Cards Or The Like (AREA)
DE2545421A 1974-10-16 1975-10-10 Verfahren zur Aufzeichnung oder Wiedergabe von Information auf einem langgestreckten magnetischen Aufzeichnungsträger sowie Aufzeichnungsträger und Einrichtung zur Durchführung des Verfahrens Expired DE2545421C3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB44749/74A GB1524187A (en) 1974-10-16 1974-10-16 Magnetic recording

Publications (3)

Publication Number Publication Date
DE2545421A1 DE2545421A1 (de) 1976-04-22
DE2545421B2 true DE2545421B2 (enExample) 1980-09-18
DE2545421C3 DE2545421C3 (de) 1981-11-26

Family

ID=10434590

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2545421A Expired DE2545421C3 (de) 1974-10-16 1975-10-10 Verfahren zur Aufzeichnung oder Wiedergabe von Information auf einem langgestreckten magnetischen Aufzeichnungsträger sowie Aufzeichnungsträger und Einrichtung zur Durchführung des Verfahrens

Country Status (3)

Country Link
US (1) US4023204A (enExample)
DE (1) DE2545421C3 (enExample)
GB (1) GB1524187A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4343478A1 (de) * 1993-12-21 1995-06-22 Visit Gmbh Personal Datacard S Einheit aus optischer Karte sowie zugehörigem Lese/Schreib-Gerät

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6011370B2 (ja) * 1976-11-16 1985-03-25 富士写真フイルム株式会社 磁気記録媒体
GB1593377A (en) * 1976-12-10 1981-07-15 Emi Ltd Security document and system
SE7713964L (sv) * 1976-12-10 1978-06-11 Emi Ltd Sekerhetsdokument och sett for dess tillverkning
US4239959A (en) * 1977-03-23 1980-12-16 General Kinetics Incorporated Perpetuation of information in magnetically recorded medium
EP0094775B1 (en) * 1982-05-18 1989-01-04 EMI Limited A method of preparing and reading information which is permananently recorded on a magnetic layer
US4639584A (en) * 1985-07-25 1987-01-27 Adams Robert T Non-alterable magnetic coding
GB8817855D0 (en) * 1988-07-27 1988-09-01 Emi Plc Thorn Electromagnetic identification system
US5254843A (en) * 1991-08-07 1993-10-19 Hynes John E Securing magnetically encoded data using timing variations in encoded data
US6241152B1 (en) * 1997-11-14 2001-06-05 Kabushiki Kaisha Toshiba Card processing apparatus and method
GB9922516D0 (en) 1999-09-24 1999-11-24 Thorn Secure Science Ltd A method of manufacturing flexible magnetic tape
GB0020121D0 (en) * 2000-08-17 2000-10-04 Thorn Secure Science Ltd Flexible magnetic foil including an optically diffractive structure
US20080084634A1 (en) * 2006-09-22 2008-04-10 Board Of Regents Of The Nevada System Of Higher Education On Behalf Of The University Nevada Devices and methods for storing data
US7950587B2 (en) * 2006-09-22 2011-05-31 The Board of Regents of the Nevada System of Higher Education on behalf of the University of Reno, Nevada Devices and methods for storing data

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3571799A (en) * 1969-08-21 1971-03-23 Ibm Data transmission terminal
GB1336132A (en) * 1969-12-03 1973-11-07 Smiths Industries Ltd Access-control equipment and item-dispensing systems including
US3626160A (en) * 1969-12-29 1971-12-07 Ibm Magnetic record sensing device
AT343373B (de) * 1972-10-20 1978-05-26 Basf Ag Magnetogrammtrager zur nicht unbemerkt veranderbaren aufzeichnung magnetischer signale und verfahren zur herstellung solcher aufzeichnungen
US3873975A (en) * 1973-05-02 1975-03-25 Minnesota Mining & Mfg System and method for authenticating and interrogating a magnetic record medium
US3878367A (en) * 1973-05-02 1975-04-15 Minnesota Mining & Mfg Magnetic security document and method for making same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4343478A1 (de) * 1993-12-21 1995-06-22 Visit Gmbh Personal Datacard S Einheit aus optischer Karte sowie zugehörigem Lese/Schreib-Gerät

Also Published As

Publication number Publication date
DE2545421C3 (de) 1981-11-26
GB1524187A (en) 1978-09-06
DE2545421A1 (de) 1976-04-22
US4023204A (en) 1977-05-10

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Legal Events

Date Code Title Description
OD Request for examination
C3 Grant after two publication steps (3rd publication)