Stock material or miscellaneous articles – Circular sheet or circular blank
Reexamination Certificate
2005-01-11
2005-01-11
Mulvaney, Elizabeth (Department: 1774)
Stock material or miscellaneous articles
Circular sheet or circular blank
C428S064500, C428S064600, C430S270130
Reexamination Certificate
active
06841217
ABSTRACT:
An optical information recording medium according to the present invention includes at least one information layer in which a first dielectric film that contains Cr, O and at least one element (M1) selected from Zr and Hf, a recording film that is provided on the first dielectric film and changed in optical property reversibly by irradiation of laser beams, and a second dielectric film that is provided on the recording film and contains Cr, O and the at least one element (M1) selected from Zr and Hf, are provided in this order from a side on which laser beams are incident. The first dielectric film has a Cr atom concentration of at least 6 at %, the second dielectric film has a Cr atom concentration of at least 9 at %, and the Cr atom concentration of the second dielectric film is larger than the Cr atom concentration of the first dielectric film.
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Kojima Rie
Nishihara Takashi
Yamada Noboru
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