JPS5564635A - Base for magnetic recording tape - Google Patents

Base for magnetic recording tape

Info

Publication number
JPS5564635A
JPS5564635A JP13767978A JP13767978A JPS5564635A JP S5564635 A JPS5564635 A JP S5564635A JP 13767978 A JP13767978 A JP 13767978A JP 13767978 A JP13767978 A JP 13767978A JP S5564635 A JPS5564635 A JP S5564635A
Authority
JP
Japan
Prior art keywords
magnetic recording
recording tape
base
particle diameter
film
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.)
Pending
Application number
JP13767978A
Other languages
Japanese (ja)
Inventor
Yoshio Kawakami
Yoneo Arai
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.)
TDK Corp
Original Assignee
TDK 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 TDK Corp filed Critical TDK Corp
Priority to JP13767978A priority Critical patent/JPS5564635A/en
Priority to GB7936710A priority patent/GB2037184A/en
Priority to NL7907911A priority patent/NL7907911A/en
Priority to DE19792943929 priority patent/DE2943929A1/en
Publication of JPS5564635A publication Critical patent/JPS5564635A/en
Pending 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
    • G11B5/73—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
    • G11B5/73935—Polyester substrates, e.g. polyethylene terephthalate characterised by roughness or surface features, e.g. by added particles
    • 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

Landscapes

  • Magnetic Record Carriers (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

PURPOSE: To form a magnetic recording tape with a few dropouts by using a base (polymer film) with specific factors (particle diameter, surface state).
CONSTITUTION: As the base film of a magnetic recording tape, a polymer film (e.g. a polyester film of approximate 15μ in thickness) with Xc and H2 is used providing that the value of (y) indicated by the formula [Xc is mean crystal particle diameter (Å); H2 is the number of projections of 0.54 to 0.80μ in height per 1mm2 square] should be 20 or less. Preferably, the above-mentioned projections are formed of inert outside particles of a substance except calcium carbide.
COPYRIGHT: (C)1980,JPO&Japio
JP13767978A 1978-11-08 1978-11-08 Base for magnetic recording tape Pending JPS5564635A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP13767978A JPS5564635A (en) 1978-11-08 1978-11-08 Base for magnetic recording tape
GB7936710A GB2037184A (en) 1978-11-08 1979-10-23 Magnetic recording tape
NL7907911A NL7907911A (en) 1978-11-08 1979-10-29 MAGNETIC RECORDING TAPE.
DE19792943929 DE2943929A1 (en) 1978-11-08 1979-10-31 MAGNETIC TAPE AND METHOD FOR THE PRODUCTION THEREOF

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13767978A JPS5564635A (en) 1978-11-08 1978-11-08 Base for magnetic recording tape

Publications (1)

Publication Number Publication Date
JPS5564635A true JPS5564635A (en) 1980-05-15

Family

ID=15204272

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13767978A Pending JPS5564635A (en) 1978-11-08 1978-11-08 Base for magnetic recording tape

Country Status (4)

Country Link
JP (1) JPS5564635A (en)
DE (1) DE2943929A1 (en)
GB (1) GB2037184A (en)
NL (1) NL7907911A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63104822A (en) * 1986-10-22 1988-05-10 Toray Ind Inc Biaxially oriented polyethylene terephthalate film

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2091631B (en) * 1981-01-05 1984-04-18 Toray Industries Base film for magnetic recording tape
DE3275959D1 (en) * 1981-03-30 1987-05-07 Teijin Ltd Magnetic recording medium
JPS59203231A (en) * 1983-05-02 1984-11-17 Diafoil Co Ltd Polyester film for magnetic tape

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63104822A (en) * 1986-10-22 1988-05-10 Toray Ind Inc Biaxially oriented polyethylene terephthalate film
JPH0317661B2 (en) * 1986-10-22 1991-03-08 Toray Industries

Also Published As

Publication number Publication date
NL7907911A (en) 1980-05-12
GB2037184A (en) 1980-07-09
DE2943929A1 (en) 1980-05-22

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