GB1316917A - Magneto-optic transducers - Google Patents

Magneto-optic transducers

Info

Publication number
GB1316917A
GB1316917A GB5211571A GB5211571A GB1316917A GB 1316917 A GB1316917 A GB 1316917A GB 5211571 A GB5211571 A GB 5211571A GB 5211571 A GB5211571 A GB 5211571A GB 1316917 A GB1316917 A GB 1316917A
Authority
GB
United Kingdom
Prior art keywords
light
block
array
magneto
detector
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
GB5211571A
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 GB1316917A publication Critical patent/GB1316917A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
    • G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
    • G11C13/06—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using magneto-optical elements
    • 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
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor

Abstract

1316917 Magneto-optical transducers INTERNATIONAL BUSINESS MACHINES CORP 10 Nov 1971 [21 Dec 1970] 52115/71 Heading G5R A magneto-optical transducer for reading out data arranged on a moving magnetic medium 32 in blocks 32A, 32B of information bits comprises an optical scanner 16-22 which successively illuminates the blocks with polarized light, the light from each block being focused on an array of light detectors 26 so that each detector 26 receives light from a single bit. The collimated incident light beam 34 is directed from block to block by a deflector 18 via a polarizer 20 and a cylindrical lens 22 which focuses the beam into a line. Light from a block 32A is focused on the array 26 by a respective one 24A of an array of lenses 24, possibly via an analyzer 28. The transducer may include a magnetic transfer film (12), Fig. 1 (not shown), on a transparent substrate (14), the film (12) being magnetized by the magnetic tape (10) and scanned as above. The substrate may be a triangular or trapezoidal prism (38), (44), Figs. 3, 4 (not shown), to which the lenses 22 and 24 are attached. If more than one detector per track is provided, any lateral displacement of the tape (10) may be compensated by a servo control (30), Fig. 1 (not shown), which selects that detector which is centred on the track being read by using guide tracks on the tape (10).
GB5211571A 1970-12-21 1971-11-10 Magneto-optic transducers Expired GB1316917A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9991570A 1970-12-21 1970-12-21

Publications (1)

Publication Number Publication Date
GB1316917A true GB1316917A (en) 1973-05-16

Family

ID=22277230

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5211571A Expired GB1316917A (en) 1970-12-21 1971-11-10 Magneto-optic transducers

Country Status (6)

Country Link
CA (1) CA954216A (en)
CH (1) CH532820A (en)
DE (1) DE2163121A1 (en)
FR (1) FR2119336A5 (en)
GB (1) GB1316917A (en)
IT (1) IT941329B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57133537A (en) * 1981-02-06 1982-08-18 Sharp Corp Magnetic and optical recording and reproducing head
FR2514913B1 (en) * 1981-10-16 1986-07-04 Bull Sa OPTO-ELECTRONIC DEVICE FOR READING INFORMATION CONTAINED ON A MAGNETIC MEDIUM
US4564877A (en) * 1982-04-28 1986-01-14 Tdk Corporation Magnetic recording/reproducing system with wide-gapped transducer and method for using same
US4562502A (en) * 1982-04-28 1985-12-31 Tdk Corporation Optical reproducing system

Also Published As

Publication number Publication date
FR2119336A5 (en) 1972-08-04
CA954216A (en) 1974-09-03
CH532820A (en) 1973-01-15
DE2163121A1 (en) 1972-07-13
IT941329B (en) 1973-03-01

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee