Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
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.
Akahira Nobuo
Ide Kazuhisa
Miyagawa Naoyasu
Nishiuchi Ken'ichi
Ohno Eiji
Hindi Nabil
Matsushita Electric - Industrial Co., Ltd.
LandOfFree
Optical information recording medium does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical information recording medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical information recording medium will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1539904