Glass material
OwnerHiroki Yamamoto, Takashi Naito +5inventors
InventorsHiroki Yamamoto, Takashi Naito, Takashi Namekawa, Yasutaka Suzuki, Ken Takahashi, Motoyasu Terao, Toshimichi Shintani
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Abstract
A glass including SiO2, Na2O, MgO, Al2O3, and cobalt oxide, wherein the cobalt oxide is 4.5-85 wt % as an oxide of CoO or 4.9-91 wt % as an oxide of Co3O4.
Claims12
A glass thin film comprising at least one of transition metal oxides and rare earth element oxides in an amount of 37.4% by weight, which is formed on an optical information recording medium by a sputtering method using a sintered body including said at least one of transition metal oxides and rare earth element oxides as a sputtering target.
A glass thin film for an optical information recording medium, comprising SiO2 and cobalt oxide, wherein said cobalt oxide is included in an amount of 4.5-85% by weight as an oxide of CoO or 4.9-91% by weight as an oxide of Co3O4, and wherein the glass thin film has an intensity distribution of light transmitted therethrough that varies non-linearly in contrast to the intensity distribution of light exposed thereon.
A glass thin film for an optical information recording medium comprising SiO2 and cobalt oxide, wherein said cobalt oxide is included in an amount of 20 to 90% by weight calculated as an oxide of CoO.
A sintered body for sputtering of an optical information recording medium, which contains Co oxide in an amount of at least 37.4% by weight.
Dependencies are inferred from the claim text.