Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1994-09-01
1996-11-26
Epps, Georgia Y.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 47, G11B 700
Patent
active
055792944
ABSTRACT:
An apparatus for recording and/or reproducing a magneto-optical recording medium having a recording layer, a reproducing layer and an intermediate layer for magnetically coupling the recording layer and the reproducing layer in a stationary state, in which the magnetic coupling between the recording layer and the reproducing layer is only able to take place in an area in which a temperature is increased to be higher than a predetermined temperature by the radiation of a light upon reproducing and in which a recorded information held in the recording layer is read out from the reproducing layer in the radiated area. This magneto-optical recording medium is characterized in that a Curie temperature of the intermediate layer is selected to be 150.degree. C. or more. Also, an apparatus which performs the above-mentioned functions and additionally which is capable of recording and/or reproducing conventional magneto-optical discs which reproduce and/or record over the entire area of irradiation.
REFERENCES:
patent: 4800550 (1989-01-01), Yamauchi
patent: 5168482 (1992-12-01), Aratani et al.
patent: 5309421 (1994-05-01), Fujisawa
Fukumoto Atsushi
Nakao Isamu
Ohta Masumi
Udagawa Toshiki
Yoshimura Shunji
Epps Georgia Y.
Huber P. W.
Sony Corporation
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