GB1263045A - Improvements in transducing systems for data recorded in parallel tracks - Google Patents

Improvements in transducing systems for data recorded in parallel tracks

Info

Publication number
GB1263045A
GB1263045A GB3385370A GB3385370A GB1263045A GB 1263045 A GB1263045 A GB 1263045A GB 3385370 A GB3385370 A GB 3385370A GB 3385370 A GB3385370 A GB 3385370A GB 1263045 A GB1263045 A GB 1263045A
Authority
GB
United Kingdom
Prior art keywords
transducers
track
output
data
transducing
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
GB3385370A
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1263045A publication Critical patent/GB1263045A/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
    • G11B7/14—Heads, e.g. forming of the optical beam spot or modulation of the optical beam specially adapted to record on, or to reproduce from, more than one track simultaneously
    • 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
    • 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
    • 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
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/10556—Disposition or mounting of transducers relative to record carriers with provision for moving or switching or masking the transducers in or out of their operative position
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/49—Fixed mounting or arrangements, e.g. one head per track
    • G11B5/4969—Details for track selection or addressing

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

1,263,045. Transducing systems; local circuits. INTERNATIONAL BUSINESS MACHINES CORP. 13 July, 1970 [18 Aug., 1969], No. 33853/70. Heading G5R. A transducing system having at least three transducers across each data track and a guide track has an electrical circuit to select as the system output those transducers which are centred over their respective data tracks. As shown, each track is the width of three transducers. Supposing transducers 1 and 2 are on the guide track, then rectifiers 31, 32 will provide zero output and Schmitt triggers 41, 42 will be at "0" output. Transducers 3-5 will be on track A, reading data, and will set triggers 43-45 to "1" output. AND-gate 52 will be enabled since both its inputs are up and will thus enable AND-gates 62, 72 and 82 to feed the signals from transducers 4, 7 and 10, which are centred on tracks A, B and C, to OR-gates 65, 75 and 85. Where there are more than three transducers per track the centre transducer outputs are paralleled (Fig. 5, not shown). Instead of rectifiers, phase- or frequency-detectors may compare the data with a reference signal recorded in the guide track. The transducers may be photodiodes in magneto-optic systems (Fig. 3, not shown).
GB3385370A 1969-08-18 1970-07-13 Improvements in transducing systems for data recorded in parallel tracks Expired GB1263045A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US85086069A 1969-08-18 1969-08-18

Publications (1)

Publication Number Publication Date
GB1263045A true GB1263045A (en) 1972-02-09

Family

ID=25309296

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3385370A Expired GB1263045A (en) 1969-08-18 1970-07-13 Improvements in transducing systems for data recorded in parallel tracks

Country Status (6)

Country Link
JP (1) JPS4934129B1 (en)
CA (1) CA947418A (en)
CH (1) CH515561A (en)
DE (1) DE2040709C3 (en)
FR (1) FR2057678A5 (en)
GB (1) GB1263045A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2514913B1 (en) * 1981-10-16 1986-07-04 Bull Sa OPTO-ELECTRONIC DEVICE FOR READING INFORMATION CONTAINED ON A MAGNETIC MEDIUM
FR2526987B1 (en) * 1982-05-14 1987-07-03 Bull Sa OPTO-ELECTRONIC METHOD FOR READING INFORMATION CONTAINED ON A MAGNETIC MEDIUM AND CIRCUIT FOR IMPLEMENTING IT
JP5672831B2 (en) * 2010-08-06 2015-02-18 Ｊｆｅスチール株式会社 Exhaust hood inspection method and exhaust hood inspection scaffold

Also Published As

Publication number Publication date
JPS4934129B1 (en) 1974-09-12
DE2040709B2 (en) 1978-10-19
DE2040709C3 (en) 1979-06-13
DE2040709A1 (en) 1971-02-25
FR2057678A5 (en) 1971-05-21
CA947418A (en) 1974-05-14
CH515561A (en) 1971-11-15

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