Optical disc system and optical disc therefor

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

1995-07-07

1996-12-24

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 13, 3692755, G11B 724

Patent

active

055879900

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: 4926403 (1990-05-01), Tsuyuguchi et al.
patent: 5197049 (1993-03-01), Wehrenberg
patent: 5276674 (1994-01-01), Tanaka
patent: 5287334 (1994-02-01), Iwabuchi et al.
patent: 5479382 (1995-12-01), Nishida et al.
patent: 5528565 (1996-06-01), Watanabe et al.

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