Optical information recording medium and method of marking BCA (burst cutting area) into the same
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United States of America Patent
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Nov 30, 2010
Grant Date -
Jan 22, 2009
app pub date -
May 15, 2007
filing date -
May 16, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical information recording medium includes a read-only information recording portion, and a BCA (Burst Cutting Area) portion formed by laser marking. A reflective film on an information recording surface of the read-only information recording portion and a reflective film on the BCA portion are formed of the same material. The reflective film includes Ag as a main component, and at least one of Nd and Gd, and at least one of Sn and In as components; the reflective film including at least one of Nd and Gd of 0.1 atom % or more and 3.0 atom % or less in total and at least one of Sn and In of 3 atom % or more and 12 atom % or less in total. Recorded information is reproduced from the information recording surface of the read-only information recording portion and a BCA signal is reproduced from the BCA portion, using blue-violet laser reproducing light.
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