Optical information recording medium in which a protective layer comprises a Ni-Cr alloy layer
US5292592A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 8, 1992 |
| Grant date | Mar 8, 1994 |
| Priority date | — |
| Expiry date | May 8, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12931
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an optical information recording medium comprising a substrate (11) of polycarbonate, a recording layer, and a reflecting layer (14) covering the reflecting layer and containing Al, an alloy layer (17) of a Ni-Cr alloy is deposited on the reflecting layer to sufficiently protect transmission of moisture into the reflecting layer. A covering layer (18) of ultraviolet curable resin may be deposited on the alloy layer. The recording layer is formed on the substrate and includes a magneto-optical layer (13) sandwiched between first and second interference layers (15, 16). For protecting transmission of moisture into the substrate, it is preferable that an additional layer (21) of SiO.sub.2 is deposited on the substrate opposite to the recording layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.