GB671269A - Improvements in or relating to multi-layer magnetic record members - Google Patents

Improvements in or relating to multi-layer magnetic record members

Info

Publication number
GB671269A
GB671269A GB10160/50A GB1016050A GB671269A GB 671269 A GB671269 A GB 671269A GB 10160/50 A GB10160/50 A GB 10160/50A GB 1016050 A GB1016050 A GB 1016050A GB 671269 A GB671269 A GB 671269A
Authority
GB
United Kingdom
Prior art keywords
layer
coercivity
binder
retentivity
magnetic
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
GB10160/50A
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.)
Brush Development Co
Original Assignee
Brush Development Co
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 Brush Development Co filed Critical Brush Development Co
Publication of GB671269A publication Critical patent/GB671269A/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)

Abstract

671,269. Magnetic records. BRUSH DEVELOPMENT CO. April 25, 1950. [Nov. 2, 1949] No. 10160/50. Drawings to Specification. Class 40 (ii). [Also in Group XXXV] A magnetic record material includes a plurality of layers of magnetic material having different magnetic properties for the purpose of providing a .better over-all response, comprising a first layer of magnetic particles in a binder, and a second layer of magnetic particles in a binder on the first layer and spaced therefrom so that the bias field from a recording head providing substantially maximum output from the first layer is also effective to provide substantially maximum output from the second layer. In a described embodiment, the first layer comprises a coating of 0.0003 inches thick and contains about 80 per cent by weight of black iron-oxide powder dispersed in a vinyl resin binder, the coercivity being about 110 oersteds and retentivity about 400 gauss, with a coercivity/retentivity ratio of 0.28, while the second layer is about 0.0002 inches thick and contains about 80 per cent by weight of black iron-cobalt-oxide dispersed in a vinyl resin-binder, the coercivity being about 480 oersteds and retentivity about 750 gauss, with a coercivity/retentivity ratio of 0.64.
GB10160/50A 1949-11-02 1950-04-25 Improvements in or relating to multi-layer magnetic record members Expired GB671269A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US671269XA 1949-11-02 1949-11-02

Publications (1)

Publication Number Publication Date
GB671269A true GB671269A (en) 1952-04-30

Family

ID=22073882

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10160/50A Expired GB671269A (en) 1949-11-02 1950-04-25 Improvements in or relating to multi-layer magnetic record members

Country Status (1)

Country Link
GB (1) GB671269A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1076389B (en) * 1956-07-28 1960-02-25 Grundig Max Multi-layer magnetogram carrier and process for its manufacture
DE1099198B (en) * 1957-10-12 1961-02-09 Loewe Opta Ag Device for magnetic recording and playback
DE1190985B (en) * 1962-02-03 1965-04-15 Agfa Ag Magnetic recording medium with two magnetic layers
DE1222539B (en) * 1960-09-20 1966-08-11 Siemens Ag Device for storing and querying signals on magnetogram carriers with transverse magnetization
DE1270112B (en) * 1961-07-06 1968-06-12 Hitachi Ltd Magnetic tape
DE1272369B (en) * 1964-12-21 1968-07-11 Deutsche Edelstahlwerke Ag Magnetic tape
DE1279089B (en) * 1959-10-14 1968-10-03 Philips Nv Process for coating substrates for magnetogram carriers
DE1280316B (en) * 1962-11-30 1968-10-17 Ibm Magnetizable recording medium
DE1300145B (en) * 1964-04-04 1969-07-31 Agfa Ag Magnetic recording process and magnetic recording medium for carrying out the process
FR2126451A1 (en) * 1971-02-26 1972-10-06 Minnesota Mining & Mfg
FR2437667A1 (en) * 1977-09-30 1980-04-25 Iwasaki Shin Ichi MAGNETIC RECORDING MEDIUM

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1076389B (en) * 1956-07-28 1960-02-25 Grundig Max Multi-layer magnetogram carrier and process for its manufacture
DE1099198B (en) * 1957-10-12 1961-02-09 Loewe Opta Ag Device for magnetic recording and playback
DE1279089B (en) * 1959-10-14 1968-10-03 Philips Nv Process for coating substrates for magnetogram carriers
DE1222539B (en) * 1960-09-20 1966-08-11 Siemens Ag Device for storing and querying signals on magnetogram carriers with transverse magnetization
DE1270112B (en) * 1961-07-06 1968-06-12 Hitachi Ltd Magnetic tape
DE1190985B (en) * 1962-02-03 1965-04-15 Agfa Ag Magnetic recording medium with two magnetic layers
DE1280316B (en) * 1962-11-30 1968-10-17 Ibm Magnetizable recording medium
DE1300145B (en) * 1964-04-04 1969-07-31 Agfa Ag Magnetic recording process and magnetic recording medium for carrying out the process
DE1272369B (en) * 1964-12-21 1968-07-11 Deutsche Edelstahlwerke Ag Magnetic tape
FR2126451A1 (en) * 1971-02-26 1972-10-06 Minnesota Mining & Mfg
FR2437667A1 (en) * 1977-09-30 1980-04-25 Iwasaki Shin Ichi MAGNETIC RECORDING MEDIUM

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