Magneto-optic recording method and magneto-optic recording/repro

Details Magneto-optic recording method and magneto-optic recording/repro Magneto-optic recording method and magneto-optic recording/repro

1992-02-07

1993-05-04

Anderson, Bruce C.

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 1304

Patent

active

052087999

ABSTRACT:
A method and apparatus for recording and reproducing information onto and from a magneto-optic recording medium is disclosed. The magneto-optic recording medium has at least a reproducing layer and a recording layer. A recording optical head records information on the magneto-optic recording medium. A reproducing optical head has a reading light beam for reading information recorded in a region within a spot of the reading light beam by magneto-optic effect by changing a state of magnetization of the reproducing layer and at the same time irradiating the recording medium with the light beam. A wavelength of the recording light beam emitted by the recording optical head is substantially smaller than a wavelength of the reading light beam emitted by the reading optical head. A minimum ratio of the wavelength of the recording light beam to that of the reproducing light beam is 1:3.

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patent: 5118541 (1992-06-01), Yamamoto et al.
patent: 5142513 (1992-08-01), Takehara et al.

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