Magneto-optical disc system having an objective lens with a nume

Details Magneto-optical disc system having an objective lens with a nume Magneto-optical disc system having an objective lens with a nume

1995-07-07

1997-04-01

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

3692755, G11B 1100

Patent

active

056173784

ABSTRACT:
An magneto-optical disc system includes an magneto-optical disc with a light-transmitting cover and an objective lens for bundling or focusing a laser beam on a recording layer of the magneto-optical disc in order to perform recording and/or reproduction. The thickness t.sub.2 of the light-transmitting cover is set to fall within the range of 0.6 to 0.1 mm, the numerical aperture (NA) of the objective lens is set to fall within the range of 0.55 to 0.70 and the wavelength of the light beam is selected to be between 635 and 680 nanometers.

REFERENCES:
patent: 4807204 (1989-02-01), Mizutani et al.
patent: 5276674 (1994-01-01), Tanaka
patent: 5479382 (1995-12-01), Nishida et al.
patent: 5481530 (1996-01-01), Ueda et al.

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