Read-only optical information recording medium and sputtering target for depositing reflective film for the optical information recording medium
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United States of America Patent
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Jun 25, 2013
Grant Date -
Sep 15, 2011
app pub date -
Sep 11, 2009
filing date -
Sep 11, 2008
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Abstract
Provided is a read-only optical information recording medium (for instance, a dual-layer BD-ROM), which uses blue laser and is provided with a reflecting film which has sufficiently high reflectivity while ensuring optical transparency required in manufacture, has excellent reproduction stability when used for an optical information recording medium and has excellent durability. The read-only optical information recording medium includes a structure wherein a plurality of laminated layers of the reflecting film and the optical transparent layer are formed on a substrate, and reproduces information by means of blue laser. The reflecting film closest to the substrate among the reflecting films is substantially composed of an Al-based alloy containing 0.5-3.0 atm % of Ti, and has a film thickness of 10 nm or more but not more than 30 nm.
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