Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1991-08-08
1994-03-08
Nguyen, Hoa T.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360114, G11B 1304
Patent
active
052933598
ABSTRACT:
A magnetic recording and reproducing apparatus using a recording medium made of a ferrimagnetic material, comprises a magnetic head for magnetically recording information on a recording area of a selected information recording track on a recording medium having a plurality of tracks and for magnetically reproducing the information from the recording medium, the magnetic head has a width larger than that of the width of the selected information recording track of the recording medium. For recording, light beams are radiated from a first light source on the recording area of the selected information recording track upon which recording is to be performed tracks to raise the temperature of the irradiated area to approximately a Curie temperature so as to allow recording only on that area. For reproduction, light beams are radiated from another light source onto areas on both sides of on a second area of the recording medium, located on both sides of the selected information recording track, to raise the temperature of the second irradiated areas to approximately a magnetic compensation temperature so as to allow reproduction only from the desired track, thus preventing crosstalk from the side tracks.
REFERENCES:
patent: 4985881 (1991-01-01), Saito et al.
patent: 5051970 (1991-09-01), Ishii et al.
patent: 5107471 (1992-04-01), Miyake et al.
patent: 5202862 (1993-04-01), Ohta et al.
patent: 5237548 (1993-08-01), Muchnik
Nomura, et al., "Proposed Magneto-Optic Video Recording Systems Using Thermoremanent Techniques" NHK Technical Research Laboratories, 1979, Institute of Electronics and Communication Engineers of Japan, Technical Research Report MR 79-3 (with partial English translation).
Hirokane Junji
Murakami Yoshiteru
Nakajima Junsaku
Ohta Kenji
Takahashi Akira
Conlin David G.
Neuner George W.
Nguyen Hoa T.
Sharp Kabushiki Kaisha
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