Magnetooptical recording apparatus with constant leakage magneti

Details Magnetooptical recording apparatus with constant leakage magneti Magnetooptical recording apparatus with constant leakage magneti

1989-11-14

1990-09-25

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, G11B 1112, G11B 1304

Patent

active

049598201

ABSTRACT:
A magnetooptical recording apparatus is disclosed which is capable of performing real-time overwrite operation. The apparatus comprises a laser beam and focusing parts thereof, and a pulse magnetic field generator device, procided on both sides of a magnetooptical recording medium, respectively. The laser beam and focusing parts thereof are formed of an objective lens connected to a moving coil which is provided with a magnet, thus the objective lens is movable relative to a magnetic layer of the magnetooptical recording medium by the interaction between the magnet and the moving coil. The magnet generates and applies a D.C. magnetic field of one polarity perpendicular to the magnetic thin film around a point where the laser beam is focused, while the pulse magnetic field generator device generates pulse magnetic field of the opposite polarity modulated by information signal around the point where the laser beam is focused. Thus one and opposite polarity magnetic field pulse row obtained by a sum of the D.C. magnetic field and the pulse magnetic field is applied to the magnetic thin film upon laser beam irradiation to perform the real-time overwrite operation.

REFERENCES:
patent: 4477852 (1984-10-01), Ota et al.
patent: 4660190 (1987-04-01), Fujii et al.
patent: 4672594 (1987-06-01), Kato et al.
patent: 4706232 (1987-11-01), Funada et al.

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