GB1450635A - Magnetic recording tapes - Google Patents

Magnetic recording tapes

Info

Publication number
GB1450635A
GB1450635A GB3167974A GB3167974A GB1450635A GB 1450635 A GB1450635 A GB 1450635A GB 3167974 A GB3167974 A GB 3167974A GB 3167974 A GB3167974 A GB 3167974A GB 1450635 A GB1450635 A GB 1450635A
Authority
GB
United Kingdom
Prior art keywords
magnetic recording
gaum
oersteds
july
flux density
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
GB3167974A
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 GB1450635A publication Critical patent/GB1450635A/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

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

Abstract

1450635 Dual layer magnetic recording tape SONY CORP 17 July 1974 [19 July 1973] 31679/74 Heading B2E A magnetic recording tape has a non- magnetisable base; a first layer 4-6 microns thick containing acicular gamma ferric oxide and having a coercive force of 260 to 320 oersteds and a saturation residual flux density of 1150 to 1600 gaum and an outer layer 0.2-2 microns thick containing chromium dioxide particles and having a coercive force or 450 to 550 oersteds and a saturation residual flux density of 1200 to 1600 gaum. and a thickness of 0.5 to 2.0 microns. Suitable coating compositions for the layers contain in addition to the magnetic particles, vinyl acetate-vinyl chloride resin, polyurethane resin, lethacin (dispersant), olive oil (lubricant), methyl ethyl ketone, toluene and cyclohexanone, and may be applied by gravure coater to a polyethylene terephthalate base.
GB3167974A 1973-07-19 1974-07-17 Magnetic recording tapes Expired GB1450635A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8214473A JPS5617734B2 (en) 1973-07-19 1973-07-19

Publications (1)

Publication Number Publication Date
GB1450635A true GB1450635A (en) 1976-09-22

Family

ID=13766224

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3167974A Expired GB1450635A (en) 1973-07-19 1974-07-17 Magnetic recording tapes

Country Status (9)

Country Link
JP (1) JPS5617734B2 (en)
AT (1) AT354761B (en)
BR (1) BR7405986D0 (en)
CA (1) CA1029129A (en)
DE (1) DE2434940A1 (en)
FR (1) FR2238207B1 (en)
GB (1) GB1450635A (en)
IT (1) IT1017325B (en)
NL (1) NL7409765A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6040041A (en) * 1997-04-05 2000-03-21 Emtec Magnetics Gmbh Magnetic recording medium

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5843815B2 (en) * 1975-10-23 1983-09-29 富士写真フイルム株式会社 Jikiki Loc Tape
JPS5769528A (en) * 1980-10-14 1982-04-28 Tdk Corp Magnetic recording medium
JPS5817539A (en) * 1981-07-21 1983-02-01 Sony Corp Magnetic recording medium
JPS5856228A (en) * 1981-09-28 1983-04-02 Sony Corp Magnetic recording medium
JPS59172142A (en) * 1983-03-20 1984-09-28 Hitachi Maxell Ltd Magnetic recording medium
JPS59172144A (en) * 1983-03-20 1984-09-28 Hitachi Maxell Ltd Magnetic recording medium

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL153374B (en) * 1966-10-05 1977-05-16 Philips Nv PROCESS FOR THE MANUFACTURE OF A SEMICONDUCTOR DEVICE PROVIDED WITH AN OXIDE LAYER AND SEMI-CONDUCTOR DEVICE MANUFACTURED ACCORDING TO THE PROCEDURE.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6040041A (en) * 1997-04-05 2000-03-21 Emtec Magnetics Gmbh Magnetic recording medium

Also Published As

Publication number Publication date
FR2238207A1 (en) 1975-02-14
DE2434940A1 (en) 1975-02-06
AT354761B (en) 1979-01-25
NL7409765A (en) 1975-01-21
JPS5031804A (en) 1975-03-28
IT1017325B (en) 1977-07-20
CA1029129A (en) 1978-04-04
JPS5617734B2 (en) 1981-04-24
BR7405986D0 (en) 1975-05-13
FR2238207B1 (en) 1979-09-21
ATA602074A (en) 1979-06-15
AU7136174A (en) 1976-01-22

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19940716