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GB864987A - Improvements in or relating to drums - Google Patents

Improvements in or relating to drums

Info

Publication number
GB864987A
GB864987A GB6506/57A GB650657A GB864987A GB 864987 A GB864987 A GB 864987A GB 6506/57 A GB6506/57 A GB 6506/57A GB 650657 A GB650657 A GB 650657A GB 864987 A GB864987 A GB 864987A
Authority
GB
United Kingdom
Prior art keywords
drum
casting
magnetic
spraying
coating
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
GB6506/57A
Inventor
Donald Peter Franklin
Frederick John Perry
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries Ltd
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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB6506/57A priority Critical patent/GB864987A/en
Publication of GB864987A publication Critical patent/GB864987A/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
    • G11B5/004—Recording on, or reproducing or erasing from, magnetic drums
    • 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
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/7368—Non-polymeric layer under the lowermost magnetic recording layer
    • 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
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73911—Inorganic substrates
    • G11B5/73917—Metallic substrates, i.e. elemental metal or metal alloy substrates
    • G11B5/73919—Aluminium or titanium elemental or alloy substrates

Landscapes

  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

A drum for magnetic data storage is constructed by casting a drum of non-magnetic material (e.g. aluminium or an alloy thereof) spraying the surface of the drum-casting with a layer of non-magnetic metal (preferably the same as the casting), and machining the sprayed layer to give a smooth surface which is then coated with magnetisable material. This method permits the formation of a good surface, free of blow holes and pits which would result if the drum-casting itself were machined, to receive the coating of magnetisable material.ALSO:A drum for magnetic data storage is constructed by casting a drum of non-magnetic material (e.g. aluminium or an alloy thereof, or gunmetal) spraying the surface of the drum-casting with a layer of non-magnetic metal (preferably the same as the casting), and machining the sprayed layer to give a smooth surface which is then coated e.g. by spraying or flow-coating with magnetizable material, e.g. magnetizable iron oxide in a binding medium. This method permits the formation of a good surface, free of blow holes and pits which would result if the drumcasting itself were machined, to receive the coating of magnetizable material.
GB6506/57A 1957-02-27 1957-02-27 Improvements in or relating to drums Expired GB864987A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB6506/57A GB864987A (en) 1957-02-27 1957-02-27 Improvements in or relating to drums

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6506/57A GB864987A (en) 1957-02-27 1957-02-27 Improvements in or relating to drums

Publications (1)

Publication Number Publication Date
GB864987A true GB864987A (en) 1961-04-12

Family

ID=9815757

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6506/57A Expired GB864987A (en) 1957-02-27 1957-02-27 Improvements in or relating to drums

Country Status (1)

Country Link
GB (1) GB864987A (en)

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