Optical information recording medium

Details Optical information recording medium Optical information recording medium

1997-06-27

1998-04-28

Hindi, Nabil

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

G11B 724

Patent

active

057454752

ABSTRACT:
An optical information recording medium includes: a substrate including a groove having a concave shape and a land having a convex shape adjacent to the groove; and a recording layer on the substrate, wherein the recording layer consists of a material which changes between a first state and a second state whose optical property is different from that of the first state, a first portion of the optical information recording medium including a portion in the first state of the recording layer having a first reflectance, and a second portion of the optical information recording medium including a region in the second state of the recording layer having a second reflectance which is different from the first reflectance, whereby information is recorded onto the groove and the land, and wherein a ratio of the first reflectance to the second reflectance, a phase of reflected light from the first portion and a phase of reflected light from the second portion are set such that at least one of an amplitude and a carrier to noise ratio (CNR) of a signal obtained by reproducing information from the groove is approximately identical to that from the land.

REFERENCES:
patent: 5249175 (1993-09-01), Akahira et al.
patent: 5274623 (1993-12-01), Usami et al.
N. Tokushuku, et al., "High C/N Recording in Sb.sub.2 Se.sub.3 /Bi Write-Once Disk", Japanese Journal of Applied Physics, vol. 31, pp. 456-460 (1992).
N. Yamada et al., "High Speed Overwritable Phase Change Optical Disk Material", Japanese Journal of Applied Physics, vol. 26, Supplement 26-4, pp. 61-66.

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