GB1176482A - Magnetic Disk - Google Patents

Magnetic Disk

Info

Publication number
GB1176482A
GB1176482A GB4639/69A GB463969A GB1176482A GB 1176482 A GB1176482 A GB 1176482A GB 4639/69 A GB4639/69 A GB 4639/69A GB 463969 A GB463969 A GB 463969A GB 1176482 A GB1176482 A GB 1176482A
Authority
GB
United Kingdom
Prior art keywords
magnetic
film
disc
sept
coated
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
GB4639/69A
Inventor
Derek John Toney
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.)
ZONAL FILM MAGNETIC COATINGS Ltd
Original Assignee
ZONAL FILM MAGNETIC COATINGS 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 ZONAL FILM MAGNETIC COATINGS Ltd filed Critical ZONAL FILM MAGNETIC COATINGS Ltd
Priority to GB4639/69A priority Critical patent/GB1176482A/en
Publication of GB1176482A publication Critical patent/GB1176482A/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
    • G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
    • G11B5/82—Disk carriers
    • G11B5/825—Disk carriers flexible discs
    • 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
    • G11B5/73923—Organic polymer substrates
    • G11B5/73927—Polyester substrates, e.g. polyethylene terephthalate
    • 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
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/702—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent
    • G11B5/7021—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent containing a polyurethane or a polyisocyanate
    • 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
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
    • G11B5/70605—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material metals or alloys
    • G11B5/70621—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material metals or alloys containing Co metal or alloys

Landscapes

  • Paints Or Removers (AREA)

Abstract

1,176,482. Magnetic disc. ZONAL FILM (MAGNETIC COATINGS) Ltd. 1 Sept., 1967 [7 Sept., 1966], No. 4639/69. Divided out of 1,176,481. Heading H1H. A magnetic disc 1, which is adapted to be carried by the support turntable described in Specification 1,176,481, has a cut out centre portion 6 and is either a film of thin base material which has coated on one side only a magnetic coating or is a thin film of magnetic material, the disc has a reinforced peripheral ring 4 which extends outwards and is adapted to fit into an annular groove 16 on the magnetic turntable. The base may be polyethylene terephthalate which may be coated with a layer of polymeric binder containing dispersed magnetic oxide particles. The polymeric binder may be a polyurethane based polymer. The polyethylene terephthalate may have an adherent film of a magnetic metal, e.g. Ni/Co alloy or Co, as the magnetic coating. The film of magnetic material may be of plastics material, e.g. polycarbonate containing finely comminuted magnetic oxide particles.
GB4639/69A 1966-09-07 1966-09-07 Magnetic Disk Expired GB1176482A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4639/69A GB1176482A (en) 1966-09-07 1966-09-07 Magnetic Disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4639/69A GB1176482A (en) 1966-09-07 1966-09-07 Magnetic Disk

Publications (1)

Publication Number Publication Date
GB1176482A true GB1176482A (en) 1970-01-01

Family

ID=9780980

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4639/69A Expired GB1176482A (en) 1966-09-07 1966-09-07 Magnetic Disk

Country Status (1)

Country Link
GB (1) GB1176482A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50142206A (en) * 1974-05-02 1975-11-15
EP0206599A2 (en) * 1985-06-14 1986-12-30 Polyplastics Co. Ltd. Magnetic disk

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50142206A (en) * 1974-05-02 1975-11-15
EP0206599A2 (en) * 1985-06-14 1986-12-30 Polyplastics Co. Ltd. Magnetic disk
EP0206599A3 (en) * 1985-06-14 1988-07-13 Polyplastics Co. Ltd. Magnetic disk

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