GB1484958A - Magnetic recording tapes - Google Patents

Magnetic recording tapes

Info

Publication number
GB1484958A
GB1484958A GB3450275A GB3450275A GB1484958A GB 1484958 A GB1484958 A GB 1484958A GB 3450275 A GB3450275 A GB 3450275A GB 3450275 A GB3450275 A GB 3450275A GB 1484958 A GB1484958 A GB 1484958A
Authority
GB
United Kingdom
Prior art keywords
ferromagnetic
oersteds
coercive force
magnetic recording
outer layer
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
GB3450275A
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Publication of GB1484958A publication Critical patent/GB1484958A/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
    • G11B5/62—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
    • G11B5/716—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 two or more magnetic layers

Landscapes

  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

1484958 Magnetic recording tape SONY CORP 19 Aug 1975 [26 Aug 1974] 34502/75 Heading B2E A magnetic recording tape has a non-magnetisable base and an inner coating of a homogeneous dispersion of ferromagnetic iron oxide powder in a resinous binder, of thickness 7-12 microns, a coercive force of 260-320 oersteds, a saturation residual flex density of 1150-1600 gauss and an outer layer of thickness 1-5 microns of a homogeneous dispersion of ferromagnetic powder in a resinous binder, having a coercive force of 380-500 oersteds, and having a saturation residual flex density of 1200-1300 gauss, the ferromagnetic powders in the outer layer including at least ferromagnetic chromium dioxide powder having a coercive force of 450-600 oersteds and a ferromagnetic iron oxide powder having a coercive force of 320-450 oersteds, the weight ratio of the ferromagnetic chromium dioxide and ferromagnetic iron oxide in the outer layer being in the range 1:4 to 4:1.
GB3450275A 1974-08-26 1975-08-19 Magnetic recording tapes Expired GB1484958A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9705574A JPS5725893B2 (en) 1974-08-26 1974-08-26

Publications (1)

Publication Number Publication Date
GB1484958A true GB1484958A (en) 1977-09-08

Family

ID=14181961

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3450275A Expired GB1484958A (en) 1974-08-26 1975-08-19 Magnetic recording tapes

Country Status (5)

Country Link
JP (1) JPS5725893B2 (en)
CA (1) CA1065481A (en)
DE (1) DE2538005A1 (en)
GB (1) GB1484958A (en)
NL (1) NL7510080A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3825619A1 (en) * 1988-07-28 1990-02-01 Agfa Gevaert Ag METHOD FOR PRODUCING A MAGNETIC RECORDING CARRIER
JP2821280B2 (en) * 1991-04-19 1998-11-05 富士写真フイルム株式会社 Magnetic recording media
WO1995002618A1 (en) * 1993-07-14 1995-01-26 Nippon Steel Chemical Co., Ltd. Process for producing rubber-modified styrene resin

Also Published As

Publication number Publication date
JPS5725893B2 (en) 1982-06-01
JPS5125104A (en) 1976-03-01
NL7510080A (en) 1976-03-01
CA1065481A (en) 1979-10-30
DE2538005A1 (en) 1976-03-18

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Legal Events

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