GB1524187A - Magnetic recording - Google Patents

Magnetic recording

Info

Publication number
GB1524187A
GB1524187A GB44749/74A GB4474974A GB1524187A GB 1524187 A GB1524187 A GB 1524187A GB 44749/74 A GB44749/74 A GB 44749/74A GB 4474974 A GB4474974 A GB 4474974A GB 1524187 A GB1524187 A GB 1524187A
Authority
GB
United Kingdom
Prior art keywords
tape
head
degrees
playback
length
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
GB44749/74A
Other languages
English (en)
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
Original Assignee
EMI 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 EMI Ltd filed Critical EMI Ltd
Priority to GB44749/74A priority Critical patent/GB1524187A/en
Priority to DE2545421A priority patent/DE2545421C3/de
Priority to US05/622,514 priority patent/US4023204A/en
Publication of GB1524187A publication Critical patent/GB1524187A/en
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)
GB44749/74A 1974-10-16 1974-10-16 Magnetic recording Expired GB1524187A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB44749/74A GB1524187A (en) 1974-10-16 1974-10-16 Magnetic recording
DE2545421A 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
US05/622,514 US4023204A (en) 1974-10-16 1975-10-15 Magnetic recording

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
GB1524187A true GB1524187A (en) 1978-09-06

Family

ID=10434590

Family Applications (1)

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

Country Status (3)

Country Link
US (1) US4023204A (https=)
DE (1) DE2545421C3 (https=)
GB (1) GB1524187A (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4593336A (en) * 1982-05-18 1986-06-03 Emi Limited Magnetic recording

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
SE7713964L (sv) * 1976-12-10 1978-06-11 Emi Ltd Sekerhetsdokument och sett for dess tillverkning
GB1593377A (en) * 1976-12-10 1981-07-15 Emi Ltd Security document and system
US4239959A (en) * 1977-03-23 1980-12-16 General Kinetics Incorporated Perpetuation of information in magnetically recorded medium
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
DE4343478A1 (de) * 1993-12-21 1995-06-22 Visit Gmbh Personal Datacard S Einheit aus optischer Karte sowie zugehörigem Lese/Schreib-Gerät
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
US3683413A (en) * 1969-12-29 1972-08-08 Ibm Method for merging variable and fixed magnetic data on a credit card or the like
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
US4593336A (en) * 1982-05-18 1986-06-03 Emi Limited Magnetic recording

Also Published As

Publication number Publication date
DE2545421C3 (de) 1981-11-26
DE2545421B2 (https=) 1980-09-18
DE2545421A1 (de) 1976-04-22
US4023204A (en) 1977-05-10

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years

Effective date: 19951001