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US 11,545,179 B2Granted
Information storage medium having multiple recording layers
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsRie Kojima, Akio Tsuchino, Kazuki Aita
Life of this patent
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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.
Claims12
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.
2 more elements
Dependencies are inferred from the claim text.