JPS6452239A - Magneto-optical memory medium - Google Patents
Magneto-optical memory mediumInfo
- Publication number
- JPS6452239A JPS6452239A JP20822887A JP20822887A JPS6452239A JP S6452239 A JPS6452239 A JP S6452239A JP 20822887 A JP20822887 A JP 20822887A JP 20822887 A JP20822887 A JP 20822887A JP S6452239 A JPS6452239 A JP S6452239A
- Authority
- JP
- Japan
- Prior art keywords
- bonded
- exchange
- coercive force
- internal stress
- low
- 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 suppress the generation of film crack, substrate warpage, etc., and to improve environmental resistance and reliability by providing protective layers having <=80kg/mm<2> internal stress in contact with at least one side of a magnetic material having an exchange-bonded two-layered structure. CONSTITUTION:The protective layers 5, 2 having <=80kg/mm<2> internal stress are provided on the one side of the recording layer 4 and reading out layer 3 of a magneto-optical memory medium having the magnetic material of the exchange-bonded two-layerd structure consisting of the recording layer 4 which has high coercive force and low Curie temp. at room temp. and the reading out layer 3 having low coercive force and high Curie temp. at room temp. on a disk-shaped polycarbonate substrate 1. While the deterioration of the coercive force with age is suppressed, the generation of the film crack, substrate warpage, etc., is suppressed by the combination of the exchange-bonded two- layered films and the protective film layers having the low internal stress of <=80kg/mm<2>. The environmental resistance and reliability are thus improved and the recording and reproducing characteristics of information are improved as well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62208228A JP2553581B2 (en) | 1987-08-24 | 1987-08-24 | Magneto-optical memory media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62208228A JP2553581B2 (en) | 1987-08-24 | 1987-08-24 | Magneto-optical memory media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6452239A true JPS6452239A (en) | 1989-02-28 |
| JP2553581B2 JP2553581B2 (en) | 1996-11-13 |
Family
ID=16552784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62208228A Expired - Fee Related JP2553581B2 (en) | 1987-08-24 | 1987-08-24 | Magneto-optical memory media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2553581B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02252150A (en) * | 1989-03-24 | 1990-10-09 | Hitachi Ltd | Optical disk and production thereof |
| JPH03173958A (en) * | 1989-12-01 | 1991-07-29 | Pioneer Electron Corp | Magneto-optical disk |
| US5233578A (en) * | 1988-12-28 | 1993-08-03 | Canon Kabushiki Kaisha | Method of recording information on a recording medium having at least two magnetic layers |
-
1987
- 1987-08-24 JP JP62208228A patent/JP2553581B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5233578A (en) * | 1988-12-28 | 1993-08-03 | Canon Kabushiki Kaisha | Method of recording information on a recording medium having at least two magnetic layers |
| JPH02252150A (en) * | 1989-03-24 | 1990-10-09 | Hitachi Ltd | Optical disk and production thereof |
| JPH03173958A (en) * | 1989-12-01 | 1991-07-29 | Pioneer Electron Corp | Magneto-optical disk |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2553581B2 (en) | 1996-11-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |