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

1995-03-09

1996-04-16

Epps, Georgia Y.

Batteries: thermoelectric and photoelectric

Thermoelectric

Radiation pyrometer

360114, 3692755, G11B 1100

Patent

active

055089810

ABSTRACT:
A magneto-optical disc system includes a magneto-optical disc with a light-transmitting cover, an objective lens for bundling or focusing a laser beam on a magnetic recording layer of the magneto-optical disc in order to perform recording and/or reproduction, and a magnetic field generating unit obtained by forming a coil pattern in an optical glass. In the above system, the thickness t.sub.2 of the light-transmitting cover is set to fall within the range of 0.6 to 0.1 mm, and the numerical aperture (NA) 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: 5287334 (1994-02-01), Iwabuchi et al.
patent: 5369628 (1994-11-01), Yoshimoto et al.
patent: 5392262 (1995-02-01), Finkelstein et al.
patent: 5392263 (1995-02-01), Watanabe et al.

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