Optical disk having a protective layer of specified thickness re

Details Optical disk having a protective layer of specified thickness re Optical disk having a protective layer of specified thickness re

1997-03-14

1998-11-17

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

3692755, G11B 1100, G11B 724

Patent

active

058386467

ABSTRACT:
An optical disc system uses an optical disc with a light-transmitting cover and an objective lens for bundling or focusing a light beam on a recording layer of the optical disc in order to perform recording and/or reproducing of information. The thickness of the light-transmitting cover falls within the range of 0.05 mm to 0.6 mm, the numerical aperture (NA) of the objective lens is set to fall within the range of 0.55 to 1.10, and the wavelength of the light beam is selected to be between 100 nm to 780 nm.

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