Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1998-06-30
2000-08-22
Neyzari, Ali
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369109, G11B 1100, G11B 708
Patent
active
061082805
ABSTRACT:
An optical information storage unit for reproducing information recorded on a magneto-optic recording medium having a land and a groove as recording tracks, is provided with at least one of first and second systems, where the first system includes a 1/2 wave plate which is arranged so that a crystal optical axis of the 1/2 wave plate and an electrical vector of a light beam emitted from a light source forms approximately 45 degrees, where the 1/2 wave plate being removable from a position of the light beam, and the second system is arranged with the 1/2 wave plate so that the crystal optical axis of the 1/2 wave plate and the electrical vector of the light beam emitted from the light source forms approximately 45 degrees, where the 1/2 wave plate is movable so that another 1/2 wave plate can move to the position of the light beam so that a crystal optical axis of the other 1/2 wave plate is parallel to or perpendicular to the electrical vector. An electrical vector of the light beam irradiated on the magneto-optic recording medium is set so that the electrical vector is perpendicular to a direction in which a recorded signal flows when reproducing the signal from the land and is parallel to the direction in which the recorded signal flows when reproducing the signal from the groove.
REFERENCES:
patent: 5508992 (1996-04-01), Hirose et al.
patent: 5831942 (1998-11-01), Morimoto et al.
High Density Land & Groove Recording with Modified Optics and PA-MFM Recording; N. Aoyama, Y. Morimoto and T. Miyahara; The Magnetics Society of Japan; pp. 233-238; 1996.
Fujitsu Ltd.
Neyzari Ali
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