Optically readable, high storage density, information carrier

Details Optically readable, high storage density, information carrier Optically readable, high storage density, information carrier

1985-04-26

1987-04-14

Kendell, Lorraine T.

Dynamic information storage or retrieval

Storage medium structure

Specified material

369283, 369286, 420413, 420534, 428 64, 428 65, B32B 302, C23C 2108, G11B 370

Patent

active

046583920

ABSTRACT:
An optically readable, high storage density information carrier usually in the form of a disk, for example, a digitally recorded audio disk (CD) or a video disk (VLP) including a base, and a microstructure on the base which contains the recorded information, and consists of spiral or annular tracks or channels on one or both sides thereof. A reflective layer of a suitable metal or alloy is applied to the side of the information disk carrying the microstructure in at least that portion in which the microstructure exists. The present invention provides an improved reflective layer which, in turn, is covered by a protective layer. The improved reflective layer is a metal alloy selected from one of the following groups of alloys: (1) a Cu-Cr alloy containing from 0.3 to 1.5% chromium, (2) an Al-Mg-Si alloy containing 0.5 to 1.5% each of magnesium and silicon, and (3) an Mg-Mn-Si alloy containing 1.2 to 2% manganese and 0.05 to 0.1% silicon.

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patent: 4313190 (1982-01-01), Slaten
patent: 4371954 (1983-02-01), Cornet
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