GB1303694A - - Google Patents

Info

Publication number
GB1303694A
GB1303694A GB4271370A GB4271370A GB1303694A GB 1303694 A GB1303694 A GB 1303694A GB 4271370 A GB4271370 A GB 4271370A GB 4271370 A GB4271370 A GB 4271370A GB 1303694 A GB1303694 A GB 1303694A
Authority
GB
United Kingdom
Prior art keywords
tape
film
magnetic
sept
magneto
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
GB4271370A
Other languages
English (en)
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 filed Critical
Publication of GB1303694A publication Critical patent/GB1303694A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10532—Heads
    • G11B11/10541—Heads for reproducing
    • G11B11/10543—Heads for reproducing using optical beam of radiation
    • G11B11/10547—Heads for reproducing using optical beam of radiation interacting with the magnetisation of an intermediate transfer element, e.g. magnetic film, included in the head

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
GB4271370A 1969-09-29 1970-09-07 Expired GB1303694A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US86182669A 1969-09-29 1969-09-29

Publications (1)

Publication Number Publication Date
GB1303694A true GB1303694A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-01-17

Family

ID=25336874

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4271370A Expired GB1303694A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1969-09-29 1970-09-07

Country Status (4)

Country Link
US (1) US3629517A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2047393A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2060935A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1303694A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2120001A (en) * 1982-04-28 1983-11-23 Tdk Corp An optical magnetic reproduction system

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3720923A (en) * 1971-07-06 1973-03-13 Honeywell Inc Optical memory with reference channel to compensate for deterioration
US3739359A (en) * 1971-08-25 1973-06-12 Du Pont Magnetic buffer storage
US4125860A (en) * 1975-06-16 1978-11-14 Nippon Telegraph And Telephone Public Corporation Reproducer for an eraseable videodisc
DE2634243A1 (de) * 1976-07-30 1978-02-02 Bosch Gmbh Robert System zur aufzeichnung und/oder wiedergabe von signalen mittels strahlen
US4101947A (en) * 1976-10-04 1978-07-18 Eastman Kodak Company Narrow track magnetic-head recorder
US4962492A (en) * 1988-04-29 1990-10-09 Laser Magnetic Storage International Company Magneto-optic data recording system, actuating device therefor and method of providing same
US10802085B2 (en) 2018-12-11 2020-10-13 Vulcan Inc. Magneto optic disk imager

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2929670A (en) * 1952-10-22 1960-03-22 Ibm Apparatus for producing magnetic records on tape
NL276507A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1961-04-03
US3314052A (en) * 1963-04-12 1967-04-11 Ibm Light modulation system
US3425770A (en) * 1965-12-01 1969-02-04 Technical Operations Inc Superimposed photostorage and separation
US3408143A (en) * 1965-12-01 1968-10-29 Technical Operations Inc Storage and readout of multiple interlaced images
US3480933A (en) * 1966-10-12 1969-11-25 Ampex Spatial filtering noise reduction scheme for a magnetooptic readout system
US3508215A (en) * 1966-11-25 1970-04-21 Sylvania Electric Prod Magnetic thin film memory apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2120001A (en) * 1982-04-28 1983-11-23 Tdk Corp An optical magnetic reproduction system

Also Published As

Publication number Publication date
DE2047393A1 (de) 1971-04-01
US3629517A (en) 1971-12-21
FR2060935A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1971-06-18

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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