Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1992-05-08
1994-03-08
Fuller, Benjamin R.
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428652, 428678, 428928, 428900, 365122, 369288, B32B 1508, G11C 1306, G11B 724
Patent
active
052925927
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.
REFERENCES:
patent: 4717628 (1988-01-01), Takahashi et al.
Sakuya Tamada et al., "Design Concept of Magneto-Optical Disk", Japanese Journal of Applied Physics, vol. 28 (1989), Supplement 28-3, pp. 67-70.
Fuller Benjamin R.
Lund Valerie Ann
NEC Corporation
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