JPS5668902A - Information recording medium disk - Google Patents

Information recording medium disk

Info

Publication number
JPS5668902A
JPS5668902A JP14398879A JP14398879A JPS5668902A JP S5668902 A JPS5668902 A JP S5668902A JP 14398879 A JP14398879 A JP 14398879A JP 14398879 A JP14398879 A JP 14398879A JP S5668902 A JPS5668902 A JP S5668902A
Authority
JP
Japan
Prior art keywords
disk
turntable
contact
center
coming
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
JP14398879A
Other languages
Japanese (ja)
Inventor
Keishi Segawa
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.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan 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 Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP14398879A priority Critical patent/JPS5668902A/en
Publication of JPS5668902A publication Critical patent/JPS5668902A/en
Pending legal-status Critical Current

Links

Landscapes

  • Magnetic Record Carriers (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

PURPOSE: To prolong the life of a disk and to make stable and excellent reproduction possible by preventing the surfce of the disk from getting uneven in rotation of the disk by increasing its thickness in a recording area gradually from the circumferential part to the center part.
CONSTITUTION: Disk D has group guard B (B') coming into airtight contact with the top surface of the outer circumferential support part of the turntable (not shown in the figure) at the outermost circumferential part and group guide A (A') coming into contact with tight contact with the top of the inner circumferential support part of the turntable in the center, and disk D is absorbed into the back room constituted between it and the turntable. To compensate the extent of depression in disk D in this case, the thickness of disk D in recording area 1 (including recorded part 2 and unrecorded part 3) is increased gradually from circumferetial part t1 to center part t2. When the extent of projection is t2-t1/2, the sliding contact of the reproducing stylus with disk D is excellent at any position in the recorded area and the reproduction of disk D can be stabilized.
COPYRIGHT: (C)1981,JPO&Japio
JP14398879A 1979-11-07 1979-11-07 Information recording medium disk Pending JPS5668902A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14398879A JPS5668902A (en) 1979-11-07 1979-11-07 Information recording medium disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14398879A JPS5668902A (en) 1979-11-07 1979-11-07 Information recording medium disk

Publications (1)

Publication Number Publication Date
JPS5668902A true JPS5668902A (en) 1981-06-09

Family

ID=15351686

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14398879A Pending JPS5668902A (en) 1979-11-07 1979-11-07 Information recording medium disk

Country Status (1)

Country Link
JP (1) JPS5668902A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61288901A (en) * 1985-06-17 1986-12-19 バスフ　アクチェン　ゲゼルシャフト Method and device for surface-treating substrate for magnetic memory disk
JPS6269826U (en) * 1985-10-18 1987-05-01
US5987003A (en) * 1996-07-23 1999-11-16 Mitsubishi Chemical Corporation Coated disk substrate having a small thickness region
US6104578A (en) * 1993-06-29 2000-08-15 International Business Machines Corporation Magnetic disk and magnetic disk apparatus having an annular start-stop area with a radial downslope

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61288901A (en) * 1985-06-17 1986-12-19 バスフ　アクチェン　ゲゼルシャフト Method and device for surface-treating substrate for magnetic memory disk
JPS6269826U (en) * 1985-10-18 1987-05-01
US6104578A (en) * 1993-06-29 2000-08-15 International Business Machines Corporation Magnetic disk and magnetic disk apparatus having an annular start-stop area with a radial downslope
US5987003A (en) * 1996-07-23 1999-11-16 Mitsubishi Chemical Corporation Coated disk substrate having a small thickness region

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