Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1989-05-18
1992-12-08
Levy, Stuart S.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 360114, 365122, G11B 700, G11B 1110
Patent
active
051703831
ABSTRACT:
A magneto-optical data recording system includes magnetic field pulse applying apparatus for applying to a magneto-optic recording medium a magnetic field pulse of a polarity corresponding to code data to be recorded, and a heating apparatus for heating the recording medium in a pulsating manner at a predetermined frequency synchronous with the code data to be recorded. During recording, the magnetic field pulse applying apparatus applies a magnetic field pulse of a polarity corresponding to code data along a track of the recording medium and the heating apparatus continuously heats the recording medium in a pulsating manner at a predetermined frequency synchronous with the code data to thereby directly overwrite the code data. The magnetic field pulse applying apparatus includes a magnetic coil driven by code data from a source of code data (data generator). The heating apparatus includes an optical head which comprises a source of laser beam driven by a laser driver and an optical system which focuses the laser beam from the source of laser beam as a small light spot onto the recording medium.
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Proceedings of SPIE, Optical Data Storage Topical Meetings, vol. 1078, No. 47, Jan. 17, 1989, pp. 300-307.
Kataoka Keiji
Miyamoto Harukazu
Niihara Toshio
Ohta Norio
Sukeda Hirofumi
Hitachi , Ltd.
Levy Stuart S.
Rhoa Joseph
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