Optical recording medium

Details Optical recording medium Optical recording medium

1993-06-28

1994-06-28

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692751, 3692755, 369279, G11B 724

Patent

active

053253531

ABSTRACT:
An optical recording medium formed of a pre-grooved substrate provided with a recording layer formed on the groove, in which the groove has a shape to satisfy the condition I.sub.Gr /I.sub.0 .gtoreq.0.85, where I.sub.0 represents the reflected light quantity from the mirror surface and I.sub.Gr represents the reflected light quantity from the groove surface when the laser beam is concentrated to a spot size of approximately 1 .mu.m on the surface of the medium, and to enable three-spot tracking to be performed. According to this invention, the CN ratio as the measure of noise in an optical recording medium can be improved.

REFERENCES:
patent: 4569881 (1986-02-01), Freese et al.
patent: 4931336 (1990-06-01), Haneda
patent: 5107486 (1992-04-01), Inui et al.

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