Multilayer optical disk and apparatus

Details Multilayer optical disk and apparatus Multilayer optical disk and apparatus

1995-02-02

1996-10-08

Nelms, David C.

Dynamic information storage or retrieval

Storage medium structure

Layered

369 94, 3692751, G11B 724

Patent

active

055638732

ABSTRACT:
A multi-layer optical disk includes a plurality of recording layers and each recording layer is composed of a first layer and a second layer having respective transmission indices of T1A and T2A with respect to a disk irradiation beam intensity A and having respective transmission indices of T1B and T2B with respect to a disk irradiation beam intensity B such that T1A.times.T2A =T1B.times.T2B. The interval between one recording layer and another recording layer is at least 10 times as long as a wavelength of an optical source providing the disk irradiation beams. Furthermore, the first and second layers may have respective thicknesses of H1 and H2 and respective refractive indices of N1A and N2A with respect to a disk irradiation beam intensity A and have respective refractive indices of N1B and N2B with respect to an irradiation beam intensity B such that N1A.times.H1+N2A.times.H2=N1B.times.H1+N2B.times.H2.

REFERENCES:
patent: 4450553 (1984-05-01), Holster
patent: 5045373 (1991-09-01), Sens
patent: 5121376 (1992-06-01), Kuder
patent: 5126996 (1992-06-01), Iida
patent: 5187703 (1993-02-01), Katayama
patent: 5255262 (1993-10-01), Best
patent: 5371730 (1994-12-01), Maeda

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