JPS5774831A - Disk-like magnetic recording medium - Google Patents

Disk-like magnetic recording medium

Info

Publication number
JPS5774831A
JPS5774831A JP56137209A JP13720981A JPS5774831A JP S5774831 A JPS5774831 A JP S5774831A JP 56137209 A JP56137209 A JP 56137209A JP 13720981 A JP13720981 A JP 13720981A JP S5774831 A JPS5774831 A JP S5774831A
Authority
JP
Japan
Prior art keywords
disk
magnetic
polishing
circumference
outside circumference
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
JP56137209A
Other languages
Japanese (ja)
Inventor
Kimitoshi Sato
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 JP56137209A priority Critical patent/JPS5774831A/en
Publication of JPS5774831A publication Critical patent/JPS5774831A/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
    • G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
    • G11B5/82—Disk carriers

Landscapes

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

Abstract

PURPOSE:To obtain a disk which is capable of fetching an average reproducing output irrespective of size of the radius of rotation, and also has long life, by forming a magnetic film whose surface has been polished, on the surface of a flexible substrate made of synthetic resin, so that the film becomes gradually thick toward the outside circumference from the inside circumference. CONSTITUTION:A magnetic film 2 is formed by applying magnetic paint on the surface a flexible substrate 1 made of synthetic resin such as polyester. It is formed like a disk having a center hole 3 by punching it. Subsequently, this disk 9 is placed on a base plate 5 of a supporting base, and the surface of the magnetic layer 2 is polished so that its thickness becomes gradually thicker toward the outside circumference from the inside circumference by moving a polishing body 10 in the diameter direction (b) (arrowed) so as to synchronize a push rod 11 and a pad 17 against a polishing surfaces 9b, adjusting the polishing pressure, or by means of increasing a moving speed of the polishing body 10 and the pad 17 toward the outside circumference, and the like. In this way, an averaged reproduced output is obtained, and a magnetic disk having a satisfactory surface is manufactured by means production.
JP56137209A 1981-10-23 1981-10-23 Disk-like magnetic recording medium Pending JPS5774831A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56137209A JPS5774831A (en) 1981-10-23 1981-10-23 Disk-like magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56137209A JPS5774831A (en) 1981-10-23 1981-10-23 Disk-like magnetic recording medium

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP4401678A Division JPS54136304A (en) 1978-04-13 1978-04-13 Disc form magnetic recording medium and polishing device

Publications (1)

Publication Number Publication Date
JPS5774831A true JPS5774831A (en) 1982-05-11

Family

ID=15193333

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56137209A Pending JPS5774831A (en) 1981-10-23 1981-10-23 Disk-like magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS5774831A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160137A1 (en) * 1983-04-28 1985-11-06 Poly-Disc Systems Inc. Recording member having a variable thickness recording layer
US4588653A (en) * 1983-08-29 1986-05-13 Dynamic Disk, Inc. Magnetic memory disk

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160137A1 (en) * 1983-04-28 1985-11-06 Poly-Disc Systems Inc. Recording member having a variable thickness recording layer
US4588653A (en) * 1983-08-29 1986-05-13 Dynamic Disk, Inc. Magnetic memory disk

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