Optical recording medium and manufacturing method thereof
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United States of America Patent
Stats
-
Oct 22, 1991
Grant Date -
N/A
app pub date -
Feb 9, 1989
filing date -
Feb 15, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical recording medium, which is used as an optical disc, optical card or the like for optically recording, reproducing, erasing and the like, includes a center substrate having formed on at least one side thereof recesses and/or protrusions. Recording films are formed on both sides thereof and transparent protective plates bonded to these recording films respectively. This arrangement substantially eliminates warping of the substrates constituting the optical recording medium and exfoliation of substrates or the like even when the optical recording medium is subjected to sudden changes in temperature. This optical recording medium demonstrates enhanced optical performance and protective effect. The selecting of the transparent protective plate is simplified because the forming recesses and/or protrusions is not a factor. By producing an optical recording medium utilizing the above features, the carrier-to-noise ratio and isotropy of the medium is improved.
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