Claims
- 1. A method for forming permanent memory locations in a magnetic storage medium, comprising the steps of:
- providing a uniform layer of magnetic-optic material having predetermined physical characteristics, said uniform layer functioning as a changeable and optically readable amorphous magnetic memory medium; and
- exposing desired locations of said uniform layer to a heat ray to irreversibly form permanent memory locations by changing said physical characteristics at said desired locations.
- 2. The method of claim 1, wherein said heat ray is a laser beam which changes the transmittance of said uniform layer.
- 3. The method of claim 1, wherein said permanent memory locations are arranged to form guide tracks.
- 4. A method for forming permanent memory locations in an information storage medium, comprising the steps of:
- proving a uniform layer of magneto-optic material having predetermined physical characteristics and functioning as a changeable and readable amorphous memory medium; and
- exposing desired locations of said uniform layer to a heat ray to irreversibly form permanent memory locations by changing said physical characteristics at said desired locations.
- 5. The method of claim 4, wherein said heat ray is a laser beam which changes the transmittance of said uniform layer.
- 6. The method of claim 4, wherein said permanent memory locations are arranged to form guide tracks.
Priority Claims (3)
Number |
Date |
Country |
Kind |
55-21910 |
Feb 1980 |
JPX |
|
55-25980 |
Feb 1980 |
JPX |
|
55-47362 |
Apr 1980 |
JPX |
|
Parent Case Info
This application is a divisional of copending application Ser. No. 237,083, filed on Feb. 23, 1981 now U.S. Pat. No. 4,467,383.
US Referenced Citations (7)
Divisions (1)
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Number |
Date |
Country |
Parent |
237083 |
Feb 1981 |
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