High density optical information recording medium using high ref

Details High density optical information recording medium using high ref High density optical information recording medium using high ref

1997-09-15

1999-03-02

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692751, G11B 724

Patent

active

058780220

ABSTRACT:
Disclosed are an optical information recording medium for recording, reproducing and erasing information by emitting laser light with a wavelength in vacuum of .lambda., which has: a transparent substrate through which the laser light can be transmitted; a high refractive-index layer which is formed on the transparent substrate; a guide groove for tracking which is formed on the high refractive-index layer; and a recording layer which is formed on the guide groove for tracking; wherein a width W of the guide groove for tracking and a refractive index n.sub.a of the high refractive-index layer are so set that the following relation: W>.lambda./(2xn.sub.a) is obtained, and an optical information recording medium for reproducing information by emitting laser light with a wavelength in vacuum of .lambda., which has: a transparent substrate through which the laser light can be transmitted; a high refractive-index layer which is formed on the transparent substrate; a concave-convex pit which is formed on the high refractive-index layer; and a reflection layer which is formed on the concave-convex pit; wherein a width W.sub.p of the concave-convex pit and a refractive index n.sub.a of the high refractive-index layer are so set that the following relation: W.sub.p >.lambda./(2xn.sub.a) is obtained.

REFERENCES:
patent: 5406546 (1995-04-01), Uchiyama et al.
patent: 5430706 (1995-07-01), Utsunomiya et al.
patent: 5581539 (1996-12-01), Horie et al.
patent: 5694379 (1997-12-01), Aratani et al.
patent: 5708651 (1998-01-01), Sugaya et al.

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