Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1998-02-27
2000-01-11
Dinh, Tan
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369 59, G11B 1100
Patent
active
060143487
ABSTRACT:
Methods and apparatus of reading the written information from the magneto-optical writing media are disclosed. According to the present invention, when the level value of an electrical signal detected from the magneto-optical writing media by a reading beam irradiated in synchronization with a clock signal is shifted from a first level value to a second level value, a phase control signal generator generates a phase control signal of the clock signal by using the difference between the shifted second level value and the following detected second level value. This phase control signal is applied to the clock signal generator and controls the time advance and the time delay of the clock signal. Therefore, the written mark and the reading beam spot are coincided to each other.
REFERENCES:
patent: 5001692 (1991-03-01), Farla et al.
patent: 5381397 (1995-01-01), Okada
patent: 5450381 (1995-09-01), Tsukamura et al.
patent: 5629912 (1997-05-01), Okawa et al.
patent: 5675569 (1997-10-01), Yamaguchi et al.
patent: 5802031 (1998-09-01), Clark et al.
Dinh Tan
LG Electronic Inc.
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