Optical information recording and reproducing disc employing a f

Details Optical information recording and reproducing disc employing a f Optical information recording and reproducing disc employing a f

1987-06-16

1989-07-25

Faber, Alan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369277, 369284, G11B 700, G11B 724

Patent

active

048520764

ABSTRACT:
An optical information recording and reproducing disc information has a substrate in the surface of which are formed signal recording grooves and cue signal recording pits. A light-absorbing thin film is formed on the surface of the substrate, the optical characteristics of the light-absorbing film being changeable thermally through irradiation by a light beam. The pitches of the grooves and pits, as well as the widths of the grooves and pits, are determined to meet specific conditions in relation to the diameter of the laser beam which is used for recording and reproduction of the signals. In addition, the depths of the grooves and pits are determined suitably in relation to the wavelength of the laser beam. With this arrangement, it is possible to attain a high quality of reproduction of information from the disc.

REFERENCES:
patent: 4385303 (1981-04-01), Akahira et al.
patent: 4385372 (1983-05-01), Drexler
patent: 4417331 (1983-11-01), Takaoka et al.
patent: 4481620 (1984-11-01), Murakami

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