JPS6450236A - Production of magnetic disk substrate - Google Patents
Production of magnetic disk substrateInfo
- Publication number
- JPS6450236A JPS6450236A JP20767987A JP20767987A JPS6450236A JP S6450236 A JPS6450236 A JP S6450236A JP 20767987 A JP20767987 A JP 20767987A JP 20767987 A JP20767987 A JP 20767987A JP S6450236 A JPS6450236 A JP S6450236A
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- temp
- magnetic disk
- molding
- disk substrate
- 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
Links
Abstract
PURPOSE:To obtain a magnetic disk substrate which is hardly changed in flatness even by a heating treatment by molding the magnetic disk substrate consisting of a synthetic resin by combining a specific metallic mold temp. and annealing temp. CONSTITUTION:The magnetic disk substrate consisting of the synthetic resin is molded by setting the mold temp. (Td: unit= deg.C) at Tg-60<=Td<=Tg-20 (Tg is the glass transition temp. of the synthetic resin to be used) and the resultant substrate is annealed at Td+10 and T-10 temp. at the time of molding the above-mentioned substrate by using the metallic mold. The substrate obtd. in such a manner is substantially released of the strain remaining therein at the time of the molding and the flatness obtd. by the molding is improved. Further, the heat resistance is improved as well and the flatness is hardly changed even by the heat applied to the substrate at the time of forming a magnetic layer thereon.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20767987A JPH07105043B2 (en) | 1987-08-20 | 1987-08-20 | Method for manufacturing magnetic disk substrate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20767987A JPH07105043B2 (en) | 1987-08-20 | 1987-08-20 | Method for manufacturing magnetic disk substrate |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6450236A true JPS6450236A (en) | 1989-02-27 |
JPH07105043B2 JPH07105043B2 (en) | 1995-11-13 |
Family
ID=16543776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20767987A Expired - Lifetime JPH07105043B2 (en) | 1987-08-20 | 1987-08-20 | Method for manufacturing magnetic disk substrate |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07105043B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6333089B1 (en) * | 1997-04-30 | 2001-12-25 | Hitachi Maxwell, Ltd. | Substrate for information recording disk, mold and stamper for injection molding substrate, and method for making stamper, and information recording disk |
-
1987
- 1987-08-20 JP JP20767987A patent/JPH07105043B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6333089B1 (en) * | 1997-04-30 | 2001-12-25 | Hitachi Maxwell, Ltd. | Substrate for information recording disk, mold and stamper for injection molding substrate, and method for making stamper, and information recording disk |
Also Published As
Publication number | Publication date |
---|---|
JPH07105043B2 (en) | 1995-11-13 |
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