Stock material or miscellaneous articles – Circular sheet or circular blank
Reexamination Certificate
2005-01-06
2008-12-02
Mulvaney, Elizabeth (Department: 1794)
Stock material or miscellaneous articles
Circular sheet or circular blank
C428S064400, C430S270120
Reexamination Certificate
active
07459194
ABSTRACT:
An optical information recording medium includes at least a reflecting layer, an optical information recording layer, a super-resolution layer and a protective layer. The super-resolution layer is a thin layer whose an optical constant changes nonlinearly due to a red shift of its band gap, and made of solid solution, compound or mixture of metal oxides containing two or more types of metal ions of the same valence. Ion radius unconformity ΔR=|(RMi−RMj)/RMj| between ion radii RMiand RMjof two types of metal ions Miand Mjarbitrarily selected from the two or more types of metal ions is 8% or less. The difference ΔE=Eg−E between band gap energy Eg of the mixture of the metal oxides and energy E corresponding to a wavelength of the laser beam is a more 0.4 or less 1.4 eV.
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Momose Hideto
Naito Takashi
Sawai Yuuichi
Yamamoto Hiroki
Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Mulvaney Elizabeth
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