Information recording medium and method for producing same
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsRie KOJIMA, Akio TSUCHINO, Kazuki AITA
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Abstract
An information recording medium and a method for producing the same according to the present disclosure are configured to have an information layer in which a larger amount of light for reproduction can be obtained, so that the medium is suitable for recording information at high recording density and is useful for a multi-layer optical disc that records a large amount of contents.
Claims14
An information recording medium comprising two or more information layers,
- wherein the information recording medium records or reproduces information by irradiation with a laser beam,
- wherein at least one of the two or more information layers is determined as a first information layer and the first information layer includes a first dielectric film and a recording film in this order from a farther end toward a nearer end of a laser beam-irradiated surface,
- wherein the first dielectric film contains at least Zr and oxygen and further contains at least one element D1 selected from Zn and Sn,
- wherein when the total number of atoms of Zr, oxygen and the element D1 is defined as 100 atom %, the first dielectric film contains Zr in an amount of 3 atom % or more and 26 atom % or less and contains the element D1 in an amount of 10 atom % or more and 43 atom % or less, and
- wherein the recording film contains at least W, Cu, Mn, and oxygen and further contains at least one element M selected from Zn, Nb, Mo, Ta, and Ti.
A method for producing an information recording medium that includes two or more information layers, the method comprising individually forming the two or more information layers,
- wherein at least one of the two or more information layers is determined as a first information layer and the step of forming the first information layer includes at least a step of forming a first dielectric film and a step of forming a recording film,
- wherein the first dielectric film containing at least Zr and oxygen and further containing at least one element D1 selected from Zn and Sn is formed in the step of forming a first dielectric film,
- wherein a recording film containing at least W, Cu, and Mn and further containing at least one element M selected from Zn, Nb, Mo, Ta, and Ti is formed in the step of forming a first dielectric film, and
- wherein the step of forming the first dielectric film and the step of forming the recording film are performed by sputtering using a DC power source.
Dependencies are inferred from the claim text.