JPS648509A - Substrate for magnetic disk and its production - Google Patents

Substrate for magnetic disk and its production

Info

Publication number
JPS648509A
JPS648509A JP16238887A JP16238887A JPS648509A JP S648509 A JPS648509 A JP S648509A JP 16238887 A JP16238887 A JP 16238887A JP 16238887 A JP16238887 A JP 16238887A JP S648509 A JPS648509 A JP S648509A
Authority
JP
Japan
Prior art keywords
substrate
glass
hardness
thickness
magnetic disks
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
JP16238887A
Other languages
Japanese (ja)
Inventor
Kazuo Inoue
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel 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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP16238887A priority Critical patent/JPS648509A/en
Publication of JPS648509A publication Critical patent/JPS648509A/en
Pending legal-status Critical Current

Links

Landscapes

  • Magnetic Record Carriers (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To enhance surface accuracy, rigidity and hardness by solidifying the glass melt injected into a space to form glass coating layers having 0.2-0.6mm thickness on the front and rear faces of a ceramics molding. CONSTITUTION:This substrate has the coating layers 1 formed of glass to 0.2-0.6mm thickness on both the front and rear faces of a central layer formed of ceramics. The substrate for magnetic disks which has the excellent surface accuracy and the high rigidity and hardness and is suitable for high-density recording magnetic disks is thereby obtd. Since the glass layers are thick and light, the load to be exerted on a driving system during high-speed rotation is small and CSS resistance is at least >=60,000 times.
JP16238887A 1987-07-01 1987-07-01 Substrate for magnetic disk and its production Pending JPS648509A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16238887A JPS648509A (en) 1987-07-01 1987-07-01 Substrate for magnetic disk and its production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16238887A JPS648509A (en) 1987-07-01 1987-07-01 Substrate for magnetic disk and its production

Publications (1)

Publication Number Publication Date
JPS648509A true JPS648509A (en) 1989-01-12

Family

ID=15753634

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16238887A Pending JPS648509A (en) 1987-07-01 1987-07-01 Substrate for magnetic disk and its production

Country Status (1)

Country Link
JP (1) JPS648509A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02217336A (en) * 1989-02-16 1990-08-30 Itochu Shoji Kk Recording disk substrate and production thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02217336A (en) * 1989-02-16 1990-08-30 Itochu Shoji Kk Recording disk substrate and production thereof

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