Pregrooved optical-disk

Details Pregrooved optical-disk Pregrooved optical-disk

1982-02-22

1984-11-06

Richardson, Robert L.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369272, 369109, H04N 700, H04N 2300

Patent

active

044816200

ABSTRACT:
An optical-disk according to an embodiment of the invention is disclosed. The optical-disk has a transparent substrate which has a surface in which a tracking groove is formed and which is made of a polymethyl methacrylate having a refractive index n.sub.1 of about 1.49, a transparent layer of polystyrene which is formed on the transparent substrate and which has a refractive index n.sub.2 of about 1.59, and a recording layer which is formed on the transparent layer of polystyrene and which is made of a substance which is melted by a pulse laser beam for recording, which becomes incident thereon through the transparent substrate and the transparent layer of polystyrene.

REFERENCES:
IEEE Spectrum, vol. 16, No. 8 (Aug. 1979), K. Bulthuis et al., "Ten Billion Bits on a Disk," pp. 26-33.
Patent Abstracts of Japan, vol. 5, No. 88 (June 9, 1981), & Japanese Patent 56 34154.
Patent Abstracts of Japan, vol. 5, No. 122 (Aug. 7, 1981), & Japanese Patent 56 61047.
Patent Abstracts of Japan, vol. 1, No. 73 (July 14, 1977), & Japanese Patent 52 10102.

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