GB770127A - Improvements in methods and apparatus for recording and reproducing magnetic information - Google Patents

Improvements in methods and apparatus for recording and reproducing magnetic information

Info

Publication number
GB770127A
GB770127A GB1408755A GB1408755A GB770127A GB 770127 A GB770127 A GB 770127A GB 1408755 A GB1408755 A GB 1408755A GB 1408755 A GB1408755 A GB 1408755A GB 770127 A GB770127 A GB 770127A
Authority
GB
United Kingdom
Prior art keywords
recording
magnetic
variations
cathode
signals
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
GB1408755A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1408755A priority Critical patent/GB770127A/en
Publication of GB770127A publication Critical patent/GB770127A/en
Priority to FR1174329D priority patent/FR1174329A/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
    • 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
    • G11B5/4907—Details for scanning
    • G11B5/4915—Structure of specially adapted heads
    • G11B5/4923—Structure of specially adapted heads in which zones of the transducing part are being physically controllable
    • 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
    • G11B11/11—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, e.g. of electrons or X-rays other than a beam of light or a magnetic field for recording
    • 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
    • G11B11/115—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,e.g. of electrons or X-rays other than a beam of light for 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
    • 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
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
    • 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
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
    • G11B5/245—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features comprising means for controlling the reluctance of the magnetic circuit in a head with single gap, for co-operation with one track
    • 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
    • G11B5/86—Re-recording, i.e. transcribing information from one magnetisable record carrier on to one or more similar or dissimilar record carriers
    • G11B5/865—Re-recording, i.e. transcribing information from one magnetisable record carrier on to one or more similar or dissimilar record carriers by contact "printing"
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/7805—Recording or playback not using inductive heads, e.g. magneto-optical, thermomagnetic, magnetostrictive, galvanomagnetic

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

770,127. Magnetic recording and reproducing apparatus. LEVIN, S. May 16, 1955, No. 14087/55. Class 40 (2). Apparatus for magnetically recording and reproducing signals comprises a recording and pick-up element which is subjected to means for producing variations of its magnetic properties in predetermined regions thereof in accordance with signals to be recorded, and subjecting a magnetic recording medium to said element whereby variations of flux in said element caused by the variation of the magnetic properties induce magnetization accordingly in the record medium. The apparatus is of particular interest for recording a wide band of information and is described with reference to the recording and reproduction of video signals. Figs. 1 and 2 show a magnetic recording element 16 in the shape of a toroid, the portion 18 of which forms the target end of a cathoderay tube. In one mode of operation with the switch 14 in position B, video signals from input stage 29 are fed to the cathode gun 24, 25, 26 and an electron beam focused and subjected to deflection voltages by known means causes local variations in magnetic characteristics of portion 18 of element 16, and causes regional variations of fringing flux produced in a winding 19 by a direct current from a source 31, and thereby induces local magnetic variations in record medium 21. In another mode of operation, with switch 14 in position A, the image signal modulation is applied to winding 19 and a constant high frequency applied to cathode 26. Another embodiment is described with reference to Fig. 7, in which a direct image from a scene or object 45 or a cathoderay tube 46 is thrown upon a cathode 39 from which electrons are focused on to an electrode 38 whereby magnetic changes are produced in element 36 as described in the first embodiment.
GB1408755A 1955-05-16 1955-05-16 Improvements in methods and apparatus for recording and reproducing magnetic information Expired GB770127A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1408755A GB770127A (en) 1955-05-16 1955-05-16 Improvements in methods and apparatus for recording and reproducing magnetic information
FR1174329D FR1174329A (en) 1955-05-16 1957-04-23 Method and apparatus for recording and reproducing magnetic indications

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1408755A GB770127A (en) 1955-05-16 1955-05-16 Improvements in methods and apparatus for recording and reproducing magnetic information

Publications (1)

Publication Number Publication Date
GB770127A true GB770127A (en) 1957-03-13

Family

ID=10034754

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1408755A Expired GB770127A (en) 1955-05-16 1955-05-16 Improvements in methods and apparatus for recording and reproducing magnetic information

Country Status (2)

Country Link
FR (1) FR1174329A (en)
GB (1) GB770127A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3079468A (en) * 1958-12-24 1963-02-26 Rca Corp Magnetic recording and reproducing
US3094699A (en) * 1959-03-03 1963-06-18 Ibm System for magnetically recording data
US3098998A (en) * 1957-10-24 1963-07-23 Ibm Magnetic transducer
US3145267A (en) * 1958-03-28 1964-08-18 Pajes Wolf Szmul Sound recording and reproducing apparatus
US3176278A (en) * 1958-04-22 1965-03-30 Litton Systems Inc Thermal method and system of magnetic recording
FR2588406A1 (en) * 1985-10-04 1987-04-10 Thomson Csf THERMOMAGNETIC RECORDING HEAD AND METHOD OF MAKING
FR2630852A1 (en) * 1988-04-27 1989-11-03 Thomson Csf THERMOMAGNETIC RECORDING HEAD
EP0685837A1 (en) * 1993-11-30 1995-12-06 Roman Igorevich Enilenis Method of writing data onto and reading data from a magnetic carrier and a head unit for carrying this out

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3098998A (en) * 1957-10-24 1963-07-23 Ibm Magnetic transducer
US3145267A (en) * 1958-03-28 1964-08-18 Pajes Wolf Szmul Sound recording and reproducing apparatus
US3176278A (en) * 1958-04-22 1965-03-30 Litton Systems Inc Thermal method and system of magnetic recording
US3079468A (en) * 1958-12-24 1963-02-26 Rca Corp Magnetic recording and reproducing
US3094699A (en) * 1959-03-03 1963-06-18 Ibm System for magnetically recording data
EP0218532A1 (en) * 1985-10-04 1987-04-15 Thomson-Csf Thermo-magnetic recording head and its production process
FR2588406A1 (en) * 1985-10-04 1987-04-10 Thomson Csf THERMOMAGNETIC RECORDING HEAD AND METHOD OF MAKING
US4949198A (en) * 1985-10-04 1990-08-14 Thomson-Csf Thermomagnetic recording head and mode of embodiment
FR2630852A1 (en) * 1988-04-27 1989-11-03 Thomson Csf THERMOMAGNETIC RECORDING HEAD
EP0341120A1 (en) * 1988-04-27 1989-11-08 Thomson-Csf Thermo-magnetic recording head
US5025341A (en) * 1988-04-27 1991-06-18 Thomson-Csf Thermo-magnetic recording head
EP0685837A1 (en) * 1993-11-30 1995-12-06 Roman Igorevich Enilenis Method of writing data onto and reading data from a magnetic carrier and a head unit for carrying this out
EP0685837A4 (en) * 1993-11-30 1996-05-31 Roman Igorevich Enilenis Method of writing data onto and reading data from a magnetic carrier and a head unit for carrying this out.

Also Published As

Publication number Publication date
FR1174329A (en) 1959-03-10

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