Read-only optical information recording medium and sputtering target for forming reflection film of said optical information recording medium
AssigneeKabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
InventorYuki TAUCHI
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Abstract
The present invention relates to a read-only optical information recording medium in which at least one reflection film and at least one light transmission layer are laid in order on a substrate and from which information is reproduced by blue laser. The reflection film includes a metal oxide containing Sn and Zn or a metal oxide containing In. The reflection film has a film thickness of 20 nm or more and 70 nm or less.
Claims6
A read-only optical information recording medium from which information is reproduced by blue laser, comprising
- at least one reflection film and at least one light transmission layer laid in order on a substrate,
- wherein the reflection film comprises a metal oxide containing Sn and Zn or a metal oxide containing In and the reflection film has a film thickness of 20 nm or more and 70 nm or less.
A sputtering target for formation of a reflection film of a read-only optical information recording medium that includes a structure that at least one reflection film and at least one light transmission layer are laid in order on a substrate and from which information is reproduced by blue laser, the sputtering target comprising
- a metal oxide containing Sn and Zn or a metal oxide containing In.
Dependencies are inferred from the claim text.