JPS5661032A - Optical magnetic recording medium - Google Patents
Optical magnetic recording mediumInfo
- Publication number
- JPS5661032A JPS5661032A JP13512479A JP13512479A JPS5661032A JP S5661032 A JPS5661032 A JP S5661032A JP 13512479 A JP13512479 A JP 13512479A JP 13512479 A JP13512479 A JP 13512479A JP S5661032 A JPS5661032 A JP S5661032A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- optical
- magnetization
- magnetic recording
- optical magnetic
- 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 an optical magnetic recording medium easy for tracking of optical beam in reading and writing, by alternately arranging the area different in coercive force, in an optical mangetic recording medium of vertical magnetization system.
CONSTITUTION: On a substrate 3 like glass, GdFe and TbFe are vapor-deposited to form an amorphous alloy thin film 12 having an easy magnetizing axis 13 toward vertical direction to the film surface. Next, the thin film 12 is irradiated and swept with a laser beam having 50W500mW of power and heat treatment is made so that the part is made with small coercive force Hc and with almost no residual magnetization. A laser beam irradiated part 14 (hatched part) is apparatly zero for magnetization 4 to be an optical guide area 14, and the nonirradiated part (white part) is in a memorized area 10 which can take a binary value of upward and downward magnetization, to form an optical magnetic recording medium 9 with such areas.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13512479A JPS5830657B2 (en) | 1979-10-22 | 1979-10-22 | magneto-optical recording medium |
US06/197,805 US4412264A (en) | 1979-10-22 | 1980-10-17 | Magneto-optic recording medium |
NL8005795A NL8005795A (en) | 1979-10-22 | 1980-10-21 | MAGNETO-OPTICAL MEMORY. |
GB8034070A GB2064847B (en) | 1979-10-22 | 1980-10-22 | Recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13512479A JPS5830657B2 (en) | 1979-10-22 | 1979-10-22 | magneto-optical recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5661032A true JPS5661032A (en) | 1981-05-26 |
JPS5830657B2 JPS5830657B2 (en) | 1983-06-30 |
Family
ID=15144375
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13512479A Expired JPS5830657B2 (en) | 1979-10-22 | 1979-10-22 | magneto-optical recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5830657B2 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56105344A (en) * | 1980-01-25 | 1981-08-21 | Fuji Photo Film Co Ltd | Photomagnetic recording medium |
JPS57157114A (en) * | 1981-03-24 | 1982-09-28 | Toshiba Mach Co Ltd | Detecting scale |
JPS587517A (en) * | 1981-07-07 | 1983-01-17 | Toshiba Mach Co Ltd | Manufacture of magnetic scale |
JPS58211604A (en) * | 1982-06-04 | 1983-12-09 | Inoue Japax Res Inc | Magnetic scale |
JPS5992455A (en) * | 1982-11-17 | 1984-05-28 | Brother Ind Ltd | Photo-magnetic recording medium |
JPS61182651A (en) * | 1985-02-08 | 1986-08-15 | Nec Corp | Photomagnetic recording medium |
US8139469B2 (en) * | 2008-06-30 | 2012-03-20 | Thomson Licensing | Compatible optical recording medium |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0312770Y2 (en) * | 1986-11-28 | 1991-03-26 |
-
1979
- 1979-10-22 JP JP13512479A patent/JPS5830657B2/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56105344A (en) * | 1980-01-25 | 1981-08-21 | Fuji Photo Film Co Ltd | Photomagnetic recording medium |
JPS636929B2 (en) * | 1980-01-25 | 1988-02-13 | Fuji Photo Film Co Ltd | |
JPS57157114A (en) * | 1981-03-24 | 1982-09-28 | Toshiba Mach Co Ltd | Detecting scale |
JPS587517A (en) * | 1981-07-07 | 1983-01-17 | Toshiba Mach Co Ltd | Manufacture of magnetic scale |
JPS58211604A (en) * | 1982-06-04 | 1983-12-09 | Inoue Japax Res Inc | Magnetic scale |
JPS5992455A (en) * | 1982-11-17 | 1984-05-28 | Brother Ind Ltd | Photo-magnetic recording medium |
JPH0353707B2 (en) * | 1982-11-17 | 1991-08-15 | Brother Ind Ltd | |
JPS61182651A (en) * | 1985-02-08 | 1986-08-15 | Nec Corp | Photomagnetic recording medium |
US8139469B2 (en) * | 2008-06-30 | 2012-03-20 | Thomson Licensing | Compatible optical recording medium |
Also Published As
Publication number | Publication date |
---|---|
JPS5830657B2 (en) | 1983-06-30 |
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