JPS648509A - Substrate for magnetic disk and its production - Google Patents
Substrate for magnetic disk and its productionInfo
- 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
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.
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)
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 |
-
1987
- 1987-07-01 JP JP16238887A patent/JPS648509A/en active Pending
Cited By (1)
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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