Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1985-06-12
1987-12-08
Cardillo, Jr., Raymond F.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369100, 360 59, 360114, 365122, G11B 1114, G11B 1304, G11B 5024
Patent
active
047122030
ABSTRACT:
Method and apparatus for processing information on a recording member having a recording film capable of recording and erasing information in accordance with the change of a magnetizing direction, by utilizing a light induced thermo-magnetic effect, in which before the intensity of the laser light is switched at the high level eliminating the magnetization of the recording film in order to effect the recording and erasing operations by focusing the laser light on the recording film as a light spot, a magnetic field with the predetermined direction according to the recording and erasing operations is previously applied on the recording film, whereby the recording and erasing operations of the magnetized information can be effected with high speed and stably by applying the normal magnetic field in the direction according to the recording and erasing operations respectively.
REFERENCES:
patent: 4094013 (1978-06-01), Hill et al.
patent: 4472748 (1984-09-01), Kato et al.
patent: 4549287 (1985-10-01), Hatano et al.
patent: 4586092 (1986-04-01), Martens et al.
patent: 4610009 (1986-09-01), Connell
Kato Tsuyoshi
Maeda Takeshi
Ojima Masahiro
Saito Atsushi
Cardillo, Jr. Raymond F.
Hitachi , Ltd.
Nguyen Hoa T.
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