Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1991-02-20
1993-09-21
Pascal, Robert J.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369272, 3692751, 3692752, G11B 1100
Patent
active
052474950
ABSTRACT:
A magneto-optical disc according to the present invention has separate regions located between mutually adjacent recording tracks. In the separate regions, magneto-optical signals are impossible to record or smaller than the recording tracks. Therefore, it is possible to maintain a low erasing power that is constant even when conditions such as off-tracking, defocusing and changes of operating temperature occur. The present invention provides a magneto-optical disc, further, which in a light modulating system restricts the recording domain so as to improve the number of times the disc can be rewritten, providing a magneto-optical disk that is highly compatible with different drives. Further, the magneto-optical disk according to the present invention is provided such that a residual signal is not caused if recording power during overwriting is lower than the previous recording power in a magnetic modulating system, further improving compatibility.
REFERENCES:
patent: 4985881 (1991-01-01), Saito et al.
patent: 5020040 (1991-05-01), Lee
patent: 5022017 (1991-05-01), Jansen et al.
Birukawa Masahiro
Hino Yasumori
Miyatake Norio
Matsushita Electric - Industrial Co., Ltd.
Pascal Robert J.
Ratliff R.
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