JPS57113418A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57113418A
JPS57113418A JP981A JP981A JPS57113418A JP S57113418 A JPS57113418 A JP S57113418A JP 981 A JP981 A JP 981A JP 981 A JP981 A JP 981A JP S57113418 A JPS57113418 A JP S57113418A
Authority
JP
Japan
Prior art keywords
base
vacuum
projections
recording medium
magnetic recording
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.)
Granted
Application number
JP981A
Other languages
Japanese (ja)
Other versions
JPH0152818B2 (en
Inventor
Shigeru Shiozaki
Tomio Adachi
Takashi Tomie
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.)
Teijin Ltd
Original Assignee
Teijin 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 Teijin Ltd filed Critical Teijin Ltd
Priority to JP981A priority Critical patent/JPS57113418A/en
Publication of JPS57113418A publication Critical patent/JPS57113418A/en
Publication of JPH0152818B2 publication Critical patent/JPH0152818B2/ja
Granted 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
    • G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
    • G11B5/851—Coating a support with a magnetic layer by sputtering

Abstract

PURPOSE:To obtain a magnetic recording medium which has high coercive force, an excellent squareness ratio, and a low noise level, by vacuum-depositing ferromagnetic metal on the surface of a nonmagnetic base which has surface roughness and the number of projections within specific ranges. CONSTITUTION:The surface roughness CLA[center line average (unit; mu) measured in accordance with JISB0601]of a base a nonmagnetic material, such as a polyester film, meets requirements shown in inequalityI, and the number (unit; number/mm.<2>) of the projection height hmu of projections meets requirements as whon bt inequality II. For this purpose, Co or Co alloy, etc. is vacuum- deposited on the surface of the base (obtained by kneading powder or by catalytic composition during polyester synthesis) having a dispersed inert inorganic compound (oxide such as MgO, ZnO, CaCO3, and Al2O3, calcium terephthalate, calcium phosphate, etc.), thereby forming a magnetic thin film to <=1.5mum. Thus, a tape has superior running characteristics, superior stability of playback output, etc.
JP981A 1981-01-05 1981-01-05 Magnetic recording medium Granted JPS57113418A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP981A JPS57113418A (en) 1981-01-05 1981-01-05 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP981A JPS57113418A (en) 1981-01-05 1981-01-05 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS57113418A true JPS57113418A (en) 1982-07-14
JPH0152818B2 JPH0152818B2 (en) 1989-11-10

Family

ID=11462453

Family Applications (1)

Application Number Title Priority Date Filing Date
JP981A Granted JPS57113418A (en) 1981-01-05 1981-01-05 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57113418A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6079518A (en) * 1983-10-06 1985-05-07 Teijin Ltd Magnitic recording medium
JPS60113319A (en) * 1983-11-25 1985-06-19 Teijin Ltd Vertical magnetic recording medium
JPS6168727A (en) * 1984-09-12 1986-04-09 Teijin Ltd Biaxially stretched polyester film
JPS61184714A (en) * 1985-02-13 1986-08-18 Nec Corp Magnetic recording medium
JPS6222235A (en) * 1985-07-23 1987-01-30 Teijin Ltd Tape for magnetic recording
JPS6277923A (en) * 1985-10-01 1987-04-10 Teijin Ltd Polyester film for magnetic recording
JPH02141920A (en) * 1988-11-22 1990-05-31 Matsushita Electric Ind Co Ltd Magnetic recording medium
JP2008124259A (en) * 2006-11-13 2008-05-29 Kitagawa Ind Co Ltd Electromagnetic-wave shield housing
US7627875B2 (en) 2003-09-11 2009-12-01 Sony Corporation Disk drive

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5415979A (en) * 1977-07-06 1979-02-06 Teijin Ltd Polyester film
JPS5417981A (en) * 1977-07-11 1979-02-09 Teijin Ltd Oriented polyester film for photosensive recorder
JPS5421306A (en) * 1977-07-19 1979-02-17 Fuji Photo Film Co Ltd Magnetic recording media
JPS5494574A (en) * 1978-01-09 1979-07-26 Toray Ind Inc Polyester film with improved surface
JPS5517851A (en) * 1978-07-21 1980-02-07 Matsushita Electric Ind Co Ltd Magnetic recording medium

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5415979A (en) * 1977-07-06 1979-02-06 Teijin Ltd Polyester film
JPS5417981A (en) * 1977-07-11 1979-02-09 Teijin Ltd Oriented polyester film for photosensive recorder
JPS5421306A (en) * 1977-07-19 1979-02-17 Fuji Photo Film Co Ltd Magnetic recording media
JPS5494574A (en) * 1978-01-09 1979-07-26 Toray Ind Inc Polyester film with improved surface
JPS5517851A (en) * 1978-07-21 1980-02-07 Matsushita Electric Ind Co Ltd Magnetic recording medium

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6079518A (en) * 1983-10-06 1985-05-07 Teijin Ltd Magnitic recording medium
JPS60113319A (en) * 1983-11-25 1985-06-19 Teijin Ltd Vertical magnetic recording medium
JPH0334127B2 (en) * 1983-11-25 1991-05-21 Teijin Ltd
JPS6168727A (en) * 1984-09-12 1986-04-09 Teijin Ltd Biaxially stretched polyester film
JPS61184714A (en) * 1985-02-13 1986-08-18 Nec Corp Magnetic recording medium
JPS6222235A (en) * 1985-07-23 1987-01-30 Teijin Ltd Tape for magnetic recording
JPS6277923A (en) * 1985-10-01 1987-04-10 Teijin Ltd Polyester film for magnetic recording
JPH045533B2 (en) * 1985-10-01 1992-01-31
JPH02141920A (en) * 1988-11-22 1990-05-31 Matsushita Electric Ind Co Ltd Magnetic recording medium
US7627875B2 (en) 2003-09-11 2009-12-01 Sony Corporation Disk drive
US7665100B2 (en) 2003-09-11 2010-02-16 Sony Corporation Disk drive
JP2008124259A (en) * 2006-11-13 2008-05-29 Kitagawa Ind Co Ltd Electromagnetic-wave shield housing

Also Published As

Publication number Publication date
JPH0152818B2 (en) 1989-11-10

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