Optical disc system and optical disk therefor

Details Optical disc system and optical disk therefor Optical disc system and optical disk therefor

1996-07-17

1997-03-11

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

3692755, G11B 1700

Patent

active

056108800

ABSTRACT:
An optical disc system using an optical disc with a light-transmitting cover and an objective lens for bundling or focusing a laser beam on a recording layer of the 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 650 nanometers.

REFERENCES:
patent: 4807204 (1989-02-01), Mizutani et al.
patent: 4922454 (1990-05-01), Taki
patent: 5287334 (1994-02-01), Iwabuchi et al.
patent: 5369628 (1994-11-01), Yoshimoto et al.

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