JPS6417248A - Multivalued logic recording and reproducing method for magneto-optical recording carrier - Google Patents
Multivalued logic recording and reproducing method for magneto-optical recording carrierInfo
- Publication number
- JPS6417248A JPS6417248A JP17241587A JP17241587A JPS6417248A JP S6417248 A JPS6417248 A JP S6417248A JP 17241587 A JP17241587 A JP 17241587A JP 17241587 A JP17241587 A JP 17241587A JP S6417248 A JPS6417248 A JP S6417248A
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- optical recording
- multivalued logic
- magnetization inversion
- logic information
- 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
Abstract
PURPOSE:To improve further the recording density by bringing one layer of plural layers of magneto-optical recording mediums to magnetization inversion, and storing multivalued logic information by the number and position of the layers which have been brought to magnetization inversion. CONSTITUTION:The intensity of at least one of a light beam radiated to a magneto- optical recording carrier and a magnetic field applied thereto is varied in accordance with recording information, at least one layer of plural layers of magneto-optical recording mediums 2, 3 is brought to magnetization inversion, and multivalued logic information is stored by the number and position of the layers which have been brought to magnetization inversion. At the time of reproduction, the multivalued logic information is reproduced by radiating a light beam to the magneto-optical recording carrier and detecting the sum total of a magneto-optical effect of the magneto-optical recording mediums of plural layers. Accordingly, the multivalued logic information can be recorded by controlling the generation of magnetization inversion in each magneto- optical recording medium, by the magnitude relation of coercive force of each magneto- optical recording medium determined by the intensity of a radiated light and the intensity of the magnetic field at that time. In such a way, the recording density of the magneto-optical recording carrier can be further improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17241587A JPS6417248A (en) | 1987-07-09 | 1987-07-09 | Multivalued logic recording and reproducing method for magneto-optical recording carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17241587A JPS6417248A (en) | 1987-07-09 | 1987-07-09 | Multivalued logic recording and reproducing method for magneto-optical recording carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6417248A true JPS6417248A (en) | 1989-01-20 |
Family
ID=15941535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17241587A Pending JPS6417248A (en) | 1987-07-09 | 1987-07-09 | Multivalued logic recording and reproducing method for magneto-optical recording carrier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6417248A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6417239A (en) * | 1987-07-10 | 1989-01-20 | Hitachi Ltd | Multi-layered magneto-optical disk and recording method thereof |
| JPH01290143A (en) * | 1988-05-16 | 1989-11-22 | Nec Corp | Magneto-optical recording medium and magneto-optical recording and reproducing method |
| JPH02289948A (en) * | 1988-12-07 | 1990-11-29 | Canon Inc | Magneto-optical recording method |
| JPH0676390A (en) * | 1992-07-10 | 1994-03-18 | Nec Corp | Optical magneto-optical recording medium and optical magneto-optical recording method |
| EP0762410A1 (en) * | 1994-05-10 | 1997-03-12 | Hitachi Maxell, Ltd. | Magnetooptical recording medium, and method and apparatus for recording/reproduction |
| US6512733B1 (en) | 1998-09-03 | 2003-01-28 | Fuji Xerox Co., Ltd. | Optical recording method, optical recording apparatus, optical reading method, and optical reading apparatus |
| US6940801B1 (en) | 1997-11-10 | 2005-09-06 | Fuji Xerox Co., Ltd. | Optical recording medium, optical recording and reproducing method and apparatus |
-
1987
- 1987-07-09 JP JP17241587A patent/JPS6417248A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6417239A (en) * | 1987-07-10 | 1989-01-20 | Hitachi Ltd | Multi-layered magneto-optical disk and recording method thereof |
| JPH01290143A (en) * | 1988-05-16 | 1989-11-22 | Nec Corp | Magneto-optical recording medium and magneto-optical recording and reproducing method |
| JPH02289948A (en) * | 1988-12-07 | 1990-11-29 | Canon Inc | Magneto-optical recording method |
| JPH0676390A (en) * | 1992-07-10 | 1994-03-18 | Nec Corp | Optical magneto-optical recording medium and optical magneto-optical recording method |
| EP0762410A1 (en) * | 1994-05-10 | 1997-03-12 | Hitachi Maxell, Ltd. | Magnetooptical recording medium, and method and apparatus for recording/reproduction |
| EP0762410A4 (en) * | 1994-05-10 | 1998-01-07 | Hitachi Maxell | Magnetooptical recording medium, and method and apparatus for recording/reproduction |
| US6940801B1 (en) | 1997-11-10 | 2005-09-06 | Fuji Xerox Co., Ltd. | Optical recording medium, optical recording and reproducing method and apparatus |
| US6512733B1 (en) | 1998-09-03 | 2003-01-28 | Fuji Xerox Co., Ltd. | Optical recording method, optical recording apparatus, optical reading method, and optical reading apparatus |
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