JPS5774851A - Magnetic optical recording device and its manufacture - Google Patents
Magnetic optical recording device and its manufactureInfo
- Publication number
- JPS5774851A JPS5774851A JP14915580A JP14915580A JPS5774851A JP S5774851 A JPS5774851 A JP S5774851A JP 14915580 A JP14915580 A JP 14915580A JP 14915580 A JP14915580 A JP 14915580A JP S5774851 A JPS5774851 A JP S5774851A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- laser beam
- track
- temperature
- bit
- 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
- 238000004519 manufacturing process Methods 0.000 title abstract 3
- 230000003287 optical effect Effects 0.000 title 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 238000002425 crystallisation Methods 0.000 abstract 2
- 230000008025 crystallization Effects 0.000 abstract 2
- 239000010408 film Substances 0.000 abstract 2
- 239000010409 thin film Substances 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000000696 magnetic material Substances 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To record and reproduce satisfactorily and also to simplify a manufacturing process, by providing a crystallized guide bit on the same track as a recording track of a recording medium containing an amorphous magnetic film. CONSTITUTION:On a glass or plastic disk, for instance, a GdDyFe compound thin film 2 being an amorphous magnetic material is formed, on which an SiO2 protective film 3 is formed. A guide bit 4 is formed on a recording track 5 by heating the thin film 2 to >= a crystallization temperature of about 350 deg.C, by an Ar laser beam. The transmission factor is increased to 3.4% from 2.1% by means of crystallization by wavelength (6328Angstrom ) of an He-Ne laser beam. On the recording track 5, a recording bit 6 is formed at a temperature of about 100 deg.C curie temperature, by the laser beam. In this way, recording and reproduction are executed satisfactorily, and the manufacturing process is also simplified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14915580A JPS5925290B2 (en) | 1980-10-23 | 1980-10-23 | magneto-optical recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14915580A JPS5925290B2 (en) | 1980-10-23 | 1980-10-23 | magneto-optical recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5774851A true JPS5774851A (en) | 1982-05-11 |
| JPS5925290B2 JPS5925290B2 (en) | 1984-06-16 |
Family
ID=15468983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14915580A Expired JPS5925290B2 (en) | 1980-10-23 | 1980-10-23 | magneto-optical recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5925290B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03242841A (en) * | 1990-02-21 | 1991-10-29 | Matsushita Electric Ind Co Ltd | magneto-optical disk |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61166959U (en) * | 1985-04-05 | 1986-10-16 | ||
| JPH0441821U (en) * | 1990-08-08 | 1992-04-09 |
-
1980
- 1980-10-23 JP JP14915580A patent/JPS5925290B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03242841A (en) * | 1990-02-21 | 1991-10-29 | Matsushita Electric Ind Co Ltd | magneto-optical disk |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5925290B2 (en) | 1984-06-16 |
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