Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1982-06-02
1985-11-19
Richardson, Robert L.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369110, 360114, 360 60, G11B 1100, G11B 1504
Patent
active
045546517
ABSTRACT:
Disclosed is an optical recording medium having a vertical magnetization film on which information is recorded along with an optically readable sign indicating whether or not erasing of recorded information is permitted. Also disclosed is a system for recording information on the recording medium, whereby the erasing of the information recorded on the recording medium is inhibited or permitted in accordance with a sensed sign on the recording medium.
REFERENCES:
patent: 4003088 (1977-01-01), Schwartz
Imamura et al, Japanese Journal of Applied Physics, vol. 19, No. 12, 12/80, pp. L731-L734.
Hatano Hideki
Kanai Mikio
Kato Sigeru
Otaki Sakashi
Tajiri Norikiyo
Pioneer Electronic Corporation
Richardson Robert L.
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