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JPS52149927A - Beam addressable information memory unit - Google Patents

Beam addressable information memory unit

Info

Publication number
JPS52149927A
JPS52149927A JP6742976A JP6742976A JPS52149927A JP S52149927 A JPS52149927 A JP S52149927A JP 6742976 A JP6742976 A JP 6742976A JP 6742976 A JP6742976 A JP 6742976A JP S52149927 A JPS52149927 A JP S52149927A
Authority
JP
Japan
Prior art keywords
memory unit
information memory
addressable information
beam addressable
addressing
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.)
Pending
Application number
JP6742976A
Other languages
Japanese (ja)
Inventor
Tatsuo Kamisaka
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP6742976A priority Critical patent/JPS52149927A/en
Publication of JPS52149927A publication Critical patent/JPS52149927A/en
Pending 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
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:Two kinds of the large and small writing laser and beam are used, thereby preventing the deterioration of the S/N ratio of memory without improving the precision of an addressing.
JP6742976A 1976-06-09 1976-06-09 Beam addressable information memory unit Pending JPS52149927A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6742976A JPS52149927A (en) 1976-06-09 1976-06-09 Beam addressable information memory unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6742976A JPS52149927A (en) 1976-06-09 1976-06-09 Beam addressable information memory unit

Publications (1)

Publication Number Publication Date
JPS52149927A true JPS52149927A (en) 1977-12-13

Family

ID=13344647

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6742976A Pending JPS52149927A (en) 1976-06-09 1976-06-09 Beam addressable information memory unit

Country Status (1)

Country Link
JP (1) JPS52149927A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8201193A (en) * 1981-03-28 1982-10-18 Kokusai Denshin Denwa Co Ltd MAGNETO-OPTICAL REGISTRATION AND REPRODUCING SYSTEM.
JPS5883347A (en) * 1981-11-09 1983-05-19 Canon Inc Photomagnetic recording device
JPS62212950A (en) * 1986-03-13 1987-09-18 Fujitsu Ltd Magneto-optical recording method
US4811328A (en) * 1984-12-03 1989-03-07 Hitachi, Ltd. Optical recording and reproducing device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8201193A (en) * 1981-03-28 1982-10-18 Kokusai Denshin Denwa Co Ltd MAGNETO-OPTICAL REGISTRATION AND REPRODUCING SYSTEM.
JPS5883347A (en) * 1981-11-09 1983-05-19 Canon Inc Photomagnetic recording device
US4953150A (en) * 1981-11-09 1990-08-28 Canon Kabushiki Kaisha Optical recording apparatus having improved erasing capability
US4811328A (en) * 1984-12-03 1989-03-07 Hitachi, Ltd. Optical recording and reproducing device
JPS62212950A (en) * 1986-03-13 1987-09-18 Fujitsu Ltd Magneto-optical recording method

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