Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1991-10-03
1993-03-23
Nguyen, Hoa
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360114, 360 59, 369 54, 369 58, 369 59, G11B 1304, G11B 1112, G11B 1110
Patent
active
051970481
ABSTRACT:
A magneto-optic recording medium has a cartridge provided with a magnetization direction indicating portion for indicating the direction of magnetization of a second magnetic layer. Alternatively, the direction of magnetization of the second magnetic layer is recorded in advance in the first magnetic layer. The direction of magnetization of the second magnetic layer indicated or recorded is detected and recognized. A magnetic field oriented in an opposite direction to the direction of magnetization detected is imparted to the magneto-optic recording medium. Alternatively, predetermined information is recorded in the first magnetic layer, the direction of magnetization of the second magnetic layer is detected on the basis of a signal reproducing that information, and the direction of a magnetic field to be applied to the magneto-optic recording medium is set on the basis of the direction of magnetization thus detected. In addition, the direction of the magnetic field to be applied to the magneto-optic recording medium is set and the output of a light beam is changed on the basis of the direction of the second magnetic layer detected.
REFERENCES:
patent: 4688203 (1987-08-01), Koishi et al.
patent: 4855975 (1989-08-01), Akasaka et al.
patent: 4910622 (1990-03-01), Saito et al.
Ito Osamu
Takeuchi Koichi
Tanaka Kunimaro
Tsutsumi Kazuhiko
Watanabe Isao
Mitsubishi Denki & Kabushiki Kaisha
Nguyen Hoa
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