Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1990-07-26
1992-12-15
Chin, Tommy P.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 13, 360114, G11B 700
Patent
active
051723646
ABSTRACT:
A magneto-optic recording apparatus which has a magnetic field generator that applies a magnetic field with a constant direction to a magneto-optic recording information medium for overwriting information to improve accuracy of recording and reproducing information onto and from magneto-optic recording information medium and further has an auxiliary magnetic field generator that compensates a variation of intensity of a magnetic field generated by the magnetic field generator and applied to the magneto-optic recording information medium is disclosed as the first invention. Also, a magneto-optic recording apparatus which performs synchronous wave detection of the reflected light signals from the magneto-optic recording information medium and controls A.C. voltages applied to an exciting coil of the magnetic field generator in response to the detected result of the synchronous wave detection, thus optimizing amplitudes of the reproducing signals from the magneto-optic recording information medium is disclosed as the second invention.
REFERENCES:
patent: 4825428 (1989-04-01), Toki
patent: 4862437 (1989-08-01), Okada
patent: 4878132 (1989-10-01), Aratani et al.
"Recording Power Characteristics of 130 mm Overwritable MO Disk by Laser Power Modulation Method", Proc. Int. Symp. on Optical Memory 1989, Japanese Journal of Applied Physics, vol. 28 (1989) supplement 28-3, pp.367-370.
Ito Osamu
Takeuchi Koichi
Tanaka Kunimaro
Tsutsumi Kazuhiko
Watanabe Isao
Chevalier Robert
Chin Tommy P.
Mitsubishi Denki & Kabushiki Kaisha
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