# US 2012/0201991 A1 · Optical information recording medium and manufacturing method thereof and optical information recording medium recording layer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2012/0201991 A1 - Document ID: US20120201991A1 - Status: Published application - Kind: A1 - Application number: 13/354,835 - Filed: 2012-01-20 - Published: 2012-08-09 - Earliest claimed: 2011-02-03 - Assignees: Sony Corporation - Inventors: Hiroshi Tabata - Web page: https://patentgrep.com/patent/US20120201991A1 ## CPC - G11B 7/24038: Multiple laminated recording layers - G11B 7/2433: Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te - G11B 7/2437: Non-metallic elements - G11B 2007/24304: {group 2 or 12 elements (e.g. Be, Ca, Mg, Zn, Cd)} - G11B 2007/24306: {transition metal elements of groups 3-10} - G11B 2007/24308: {transition metal elements of group 11 (Cu, Ag, Au)} - G11B 2007/2432: {Oxygen} - G11B 2007/25706: {containing transition metal elements (Zn, Fe, Co, Ni, Pt)} - G11B 2007/25708: {containing group 13 elements (B, Al, Ga)} - G11B 2007/2571: {containing group 14 elements except carbon (Si, Ge, Sn, Pb)} - G11B 2007/25715: {containing oxygen} - Y10T 428/21: Circular sheet or circular blank - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An optical information recording medium including a substrate; two or more recording layers provided on the substrate; and a protective layer provided on the recording layers, wherein the surface of one of the side of the substrate and the protective layer is a light irradiation plane, at least one of the recording layers other than the recording layer at the deepest position from the light irradiation plane includes W, Pd, and Cu oxides as the principal components, and the ratio of W, Pd, and Cu that are respectively included in the W, Pd, and Cu oxides satisfies the relationship 0.17≦x1 (where x1=a/(b+0.8c), where a: atomic ratio of W with respect to the total of W, Pd, and Cu, b: atomic ratio of Pd with respect to the total of W, Pd, and Cu, and c: atomic ratio of Cu with respect to the total of W, Pd, and Cu). ## Claims ### Claim 1 An optical information recording medium comprising: a substrate; two or more recording layers provided on the substrate; and a protective layer provided on the recording layers, wherein a surface of one of a side of the substrate and the protective layer is a light irradiation plane on which light for recording information signals on the two or more recording layers is irradiated, at least one of recording layers other than a recording layer at a deepest position from the light irradiation plane includes W oxide, Pd oxide, and Cu oxide as principal components, and a ratio of W, Pd, and Cu that are respectively included in the W oxide, the Pd oxide, and the Cu oxide satisfies the relationship 0.17≦x1 (where x1=a/(b+0.8c), where a: atomic ratio (atomic %) of W with respect to a total of W, Pd, and Cu, b: atomic ratio (atomic %) of Pd with respect to a total of W, Pd, and Cu, and c: atomic ratio (atomic %) of Cu with respect to a total of W, Pd, and Cu). ### Claim 2 (depends on 1) The optical information recording medium according to claim 1, wherein at least one of the recording layers other than the recording layer at the deepest position from the light irradiation plane includes W oxide, Pd oxide, Cu oxide, and Zn oxide as principal components, and the ratio of W, Pd, Cu, and Zn that are respectively included in the W oxide, the Pd oxide, the Cu oxide, and the Zn oxide satisfies a relationship 0.17≦x2 (where x2=(0.1d+a)/(b+0.8c), where a: atomic ratio (atomic %) of W with respect to a total of W, Pd, Cu, and Zn, b: atomic ratio (atomic %) of Pd with respect to a total of W, Pd, Cu, and Zn, c: atomic ratio (atomic %) of Cu with respect to a total of W, Pd, Cu, and Zn, and d: atomic ratio (atomic %) of Zn with respect to a total of W, Pd, Cu, and Zn). ### Claim 3 (depends on 1) The optical information recording medium according to claim 1, wherein the ratio of W, Pd, and Cu that are respectively included in the W oxide, the Pd oxide, and the Cu oxide satisfies a relationship 0.37≦x1. ### Claim 4 (depends on 1) The optical information recording medium according to claim 1, wherein the ratio of W, Pd, and Cu that are respectively included in the W oxide, the Pd oxide, and the Cu oxide satisfies a relationship 0.37≦x1≦1.26. ### Claim 5 (depends on 1) The optical information recording medium according to claim 1, wherein all recording layers other than the recording layer at the deepest position from the light irradiation plane includes W oxide, Pd oxide, and Cu oxide as the principal components, and the ratio of W, Pd, and Cu that are respectively included in the W oxide, the Pd oxide, and the Cu oxide satisfies a relationship 0.17≦x1. ### Claim 6 (depends on 5) The optical information recording medium according to claim 5, wherein a value of x1 becomes greater for recording layers closer to the light irradiation plane. ### Claim 7 (depends on 1) The optical information recording medium according to claim 1, wherein a relationship in which the ratio x1 of W, Pd, and Cu that are respectively included in the W oxide, the Pd oxide, and the Cu oxide is greater for recording layers close to the light irradiation plane is satisfied. ### Claim 8 (depends on 1) The optical information recording medium according to claim 1, wherein the atomic ratio a, the atomic ratio b, and the atomic ratio c respectively satisfy relationships 10≦a≦70, 2≦b≦50, and 10≦c≦70. ### Claim 9 (depends on 2) The optical information recording medium according to claim 2, wherein the ratio of W, Pd, Cu, and Zn that are respectively included in the W oxide, the Pd oxide, the Cu oxide, and the Zn oxide satisfies a relationship 0.37≦x2. ### Claim 10 (depends on 2) The optical information recording medium according to claim 2, wherein the ratio of W, Pd, Cu, and Zn that are respectively included in the W oxide, the Pd oxide, the Cu oxide, and the Zn oxide satisfies a relationship 0.37≦x2≦1.26. ### Claim 11 (depends on 2) The optical information recording medium according to claim 2, wherein all recording layers other than the recording layer at the deepest position from the light irradiation plane includes W oxide, Pd oxide, Cu oxide, and Zn oxide as the principal components, and the ratio of W, Pd, Cu, and Zn that are respectively included in the W oxide, the Pd oxide, the Cu oxide, and the Zn oxide satisfies a relationship 0.17≦x2. ### Claim 12 (depends on 11) The optical information recording medium according to claim 11, wherein a value of x2 becomes greater for recording layers closer to the light irradiation plane. ### Claim 13 (depends on 2) The optical information recording medium according to claim 2, wherein a relationship in which the ratio x2 of W, Pd, Cu, and Zn that are respectively included in the W oxide, the Pd oxide, the Cu oxide, and the Zn oxide is greater for recording layers close to the light irradiation plane is satisfied. ### Claim 14 (depends on 2) The optical information recording medium according to claim 2, wherein the atomic ratio a, the atomic ratio b, the atomic ratio c, and the atomic ratio d respectively satisfy relationships 10a≦70, 2≦b≦50, 10≦c≦70, and 5≦d≦60. ### Claim 15 (depends on 1) The optical information recording medium according to claim 1, further comprising: a first protective layer and a second protective layer that are provided to be adjacent on both sides of the recording layers, wherein the first protective layer and the second protective layer are dielectric layers or transparent conductive layers. ### Claim 16 An optical information recording medium recording layer comprising: W oxide, Pd oxide, and Cu oxide as principal components, wherein a ratio of W, Pd, and Cu that are respectively included in the W oxide, the Pd oxide, and the Cu oxide satisfies a relationship 0.17≦x1 (where x1=a/(b+0.8c), where a: atomic ratio (atomic %) of W with respect to a total of W, Pd, and Cu, b: atomic ratio (atomic %) of Pd with respect to a total of W, Pd, and Cu, and c: atomic ratio (atomic %) of Cu with respect to a total of W, Pd, and Cu). ### Claim 17 A manufacturing method of an optical information recording medium comprising: forming a metal oxide recording layer by reactive sputtering with at least oxygen using an optical information recording medium target, wherein the optical information recording medium target includes W, Pd, and Cu as principal components, and a ratio of W, Pd, and Cu satisfies a relationship 0.17≦x1 (where x1=a/(b+0.8c), where a: atomic ratio (atomic %) of W with respect to a total of W, Pd, and Cu, b: atomic ratio (atomic %) of Pd with respect to a total of W, Pd, and Cu, and c: atomic ratio (atomic %) of Cu with respect to a total of W, Pd, and Cu).