Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1989-03-06
1991-02-05
Levey, Stuart S.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360114, G11B 1304
Patent
active
049911589
ABSTRACT:
An optical information recording and reporducing apparatus for recording and reproducing information optically against recording material, includes means for generating a first light beam for reproducing and erasing information which is previously recorded in the recording material, and means for providing a second light beam for recording new information into the recording material, and irradiation of the first light beam and the second light beam to an arbitrary point on the recording material is conducted in the above-mentioned order. Another type recording and reproducing apparatus includes an optical head which introduces a light beam onto optical information recording material and takes out a reproduced signal from the optical information recording material, means for applying a magnetic field whose polarity is in accordance with writing-in information to the recording material, and means for demodulating the signal reproduced from the optical head, and the light beam is made have no modulation and the level thereof is set at a level which gives a rise to above Curie temperture which is required for the writing-in at the writing-in operation, and the signal reproduced from the recorded information by the optical head direct before rewriting is demodulated and monitored.
REFERENCES:
patent: 4477852 (1984-10-01), Ota et al.
patent: 4566088 (1986-01-01), Yoshida et al.
patent: 4686661 (1987-08-01), Isaka
patent: 4805043 (1989-02-01), Doyle
High Speed Overwritable Magneto-Optic Recording, Takeshi Nakao et al, Japanese, Journal of Applied Physics, vol. 26 (1987) Supplement 26-4, pp. 149 to 154.
High Density Magneto-Optical Disc Capable of Overwriting by Magnetic Field Modulation, Ryo Ando et al, Japanese Society of Electronics, Information, and Communication Engineers, Technical Research Report MR87-37 Nov. 1987, pp. 13-20.
Levey Stuart S.
Mitsubishi Denki & Kabushiki Kaisha
Tomessini James E.
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