Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1992-07-08
1994-05-31
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 13, G11B 1304
Patent
active
053175557
ABSTRACT:
A magneto-optical disk has a recording layer whereon recorded bits are formed by the magnetic field modulation method and a readout layer whose axis of easy magnetization is parallel to the recording layer at room temperature, and varies to be perpendicular to the recording layer within a predetermined temperature range between room temperature and the Curie temperature. During reproduction of the recorded bits the first semiconductor laser emits a heating-use light beam to form the first light spot on the readout layer Thus, a ring-shaped region corresponding to the predetermined temperature range exhibits perpendicular magnetic anisotropy and the recorded bits are copied from the recording layer onto the ring-shaped region. As the first light spot is shifted, the ring-shaped region as a readout window of recorded bits is also shifted. Further, the second semiconductor laser emits a reproduction-use light beam such that the second light spot is formed on the readout layer to overlap the first light spot at a rear portion thereof. Consequently, only one recorded bit copied onto the rear portion of the ring-shaped region can be reproduced; therefore, high-quality reproduced signals can be obtained from the magneto-optical disk having information recorded with high density.
REFERENCES:
patent: 5051970 (1991-09-01), Ishii et al.
patent: 5093822 (1992-03-01), Kugiya et al.
patent: 5168482 (1992-12-01), Aratani et al.
Co-pending application, U.S. Patent Application Ser. No. 07/870,630 filed Apr. 16, 1992.
Co-pending application, U.S. Patent Application Ser. No. 07/909,969 Filed Jul. 7, 1992.
Co-pending application, U.S. Patent Application Ser. No. 07/910,678 filed Jul. 8, 1992.
"Read Out Mechanism of Magnetically Induced Super Resolution" (Proceedings of Magneto-Optical Recording International Symposium 1991, J. Magn. Soc. Jpn., vol. 15, Supplement No. S1 (1991), pp. 319-322).
Murakami Yoshiteru
Nakajima Junsaku
Ohta Kenji
Takahashi Akira
Beyer James
Conlin David G.
Dzierzynski Paul M.
O'Connell Robert F.
Sharp Kabushiki Kaisha
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