Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1992-09-11
1995-04-25
Ryan, Patrick J.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428 65, 428457, 428913, 3461351, 430945, 369288, 347264, B32B 300
Patent
active
054097568
ABSTRACT:
An optical disc for use as a compact disc, an optical video disc, or the like has a disc substrate of a light-transmissive material such as polycarbonate, PMMA, or the like. The disc substrate has a pattern of pits and lands formed as representing an information signal on at least one surface thereof. A thin reflective layer of a-corrosion-resistant metallic material such as an alloy of Fe, Ni, and Co is deposited on the disc substrate over the pattern of pits and lands. The optical disc is relatively inexpensive to manufacture as no protective layer needs to be deposited on the reflective layer and is also highly resistant to loss of performance with aging because the reflective layer is made of a corrosion-resistant metallic material.
REFERENCES:
patent: 4956216 (1990-09-01), Hausler et al.
Patent Abstracts of Japan, vol. 8, No. 45 (P-257), 28 Feb. 1984 & JP-A-58 196 641 (Sharp K.K.), 16 Nov. 1983.
Patent Abstracts of Japan, vol. 14, No. 98 (P-1011), 22 Feb. 1990 & JP-A-13 02 552 (Hitachi Maxell Ltd.).
Ikeda Jiro
Yanagisawa Yoshitake
Evans Elizabeth
Ryan Patrick J.
Sammut Charles P.
Sony Corporation
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