Optical Recording Medium
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United States of America Patent
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Issued Date -
Dec 27, 2007
app pub date -
Apr 21, 2005
filing date -
Apr 22, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An optical recording medium 300, which is provided with multiple recording layers formed on a transparent substrate to improve a recording characteristic, includes two recording layers (a first recording layer 302 and a second recording layer 305) provided on a transparent first substrate 301 and capable of recording and reading information by use of an irradiated laser beam 310, and an intermediate layer 304 provided between the two recording layers. A predetermined groove serving as a recording track is formed on a surface on an opposite side to the first substrate 301 side in terms of the intermediate layer 304. The intermediate layer 304 is formed of multiple resin layers (a first resin layer 304a, a second resin layer 304b, . . . , and an outermost resin layer 304c). When the resin layer on which the predetermined groove serving as the recording track is formed is defined as the outermost resin layer 304c, the outermost resin layer 304c is formed of resin having an elastic modulus which is different from those of the other resin layers constituting the intermediate layer 304.
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