Magneto-optical disk system with specified thickness for protect

Details Magneto-optical disk system with specified thickness for protect Magneto-optical disk system with specified thickness for protect

1994-07-19

1995-02-21

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, G11B 1304

Patent

active

053922638

ABSTRACT:
A magneto-optical disc system includes a magneto-optical disc with a light transmitting protective layer, an objective lens for bundling or focusing a laser beam onto a magnetic recording layer of the magneto-optical disc in order to perform recording and/or reproduction, and a magnetic field generating unit formed as a coil pattern on a transparent optical glass layer. In the magneto-optical disc system, the thickness t.sub.2 of the light-transmitting protective layer is set to fall within the range of 0.6 to 1.0 mm and the numerical aperture of the objective lens is set to fall within the range of 0.55 to 0.70, so as to obtain high density recording and/or reproduction by permitting the lens to be quite close to the actual recording layer.

REFERENCES:
patent: 4447899 (1984-05-01), Geyer et al.
patent: 4788671 (1988-11-01), Kanda
patent: 4807204 (1989-02-01), Mizutani et al.
patent: 4922454 (1990-05-01), Taki
patent: 5197049 (1993-03-01), Wehrenberg
patent: 5202862 (1993-04-01), Ohta et al.

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