Optical recording medium

Patent metadata

Field	Value
Publication number	US-10176839-B2
Application number	US-201515548155-A
Country	US
Kind code	B2
Filing date	Nov 18, 2015
Priority date	Feb 10, 2015
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

An optical recording medium includes a reflective layer, a first dielectric layer, a phase-change recording layer, and a second dielectric layer. The phase-change recording layer has an average composition represented by SbxInyMz, in which M is at least one of Mo, Ge, Mn, and Al, and x, y, and z are values in the ranges 0.70≤x≤0.92, 0.05≤y≤0.20, and 0.03≤z≤0.10, respectively, provided that x+y+z=1, the first dielectric layer includes a zirconium oxide-containing composite material or tantalum oxide, and the second dielectric layer includes a chromium oxide-containing composite material or silicon nitride.

First claim

The invention claimed is:

1. An optical recording medium, comprising:
a reflective layer;
a first dielectric layer;
a phase-change recording layer; and
a second dielectric layer,
wherein the phase-change recording layer has an average composition represented by formula (1): SbxInyMz,
wherein M is at least one of Mo, Mn, or Al, and x, y, and z are values in ranges 0.70≤x≤0.92, 0.05≤y≤0.20, and 0.03≤z≤0.10, respectively, provided that x+y+z=1,
wherein the first dielectric layer comprises one of a zirconium oxide-containing composite material or tantalum oxide, and
wherein the second dielectric layer comprises one of a chromium oxide-containing composite material or silicon nitride.

2. The optical recording medium according to claim 1 , wherein the first dielectric layer comprises a composite oxide comprising zirconium oxide and at least one of indium oxide or silicon oxide.

3. The optical recording medium according to claim 1 ,
wherein the first dielectric layer comprises a composite oxide comprising zirconium oxide and indium oxide, and
wherein the composite oxide has zirconium oxide content of 20 mol % to 50 mol % and indium oxide content of 10 mol % to 50 mol %.

4. The optical recording medium according to claim 1 , wherein the second dielectric layer comprises a composite oxide comprising at least two of chromium oxide, zirconium oxide, or silicon oxide.

5. The optical recording medium according to claim 1 ,
wherein the second dielectric layer comprises a composite oxide comprising chromium oxide and zirconium oxide, and
wherein the composite oxide has chromium oxide content of 20 mol % to 50 mol % and zirconium oxide content of 30 mol % to 70 mol %.

6. The optical recording medium according to claim 1 , wherein a thickness of the phase-change recording layer is one of less than or equal to 8 nm.

7. The optical recording medium according to claim 1 , wherein the optical recording medium has a recording linear velocity from 14 m/s to 23 m/s and a recording mark length one of less than or equal to 112 nm.

8. An optical recording medium, comprising:
at least two recording layers, each recording layer of the at least two recording layers comprising
a reflective layer,
a first dielectric layer,
a phase-change recording layer, and
a second dielectric layer,
wherein the phase-change recording layer has an average composition represented by formula (1): SbxInyMz,
wherein M is at least one of Mo, Mn, or Al, and x, y, and z are values in ranges 0.70≤x≤0.92, 0.05≤y≤0.20, and 0.03≤z≤0.10, respectively, provided that x+y+z=1,
wherein a first recording layer of the at least two recording layers is located deeper in the optical recording medium than a second recording layer of the at least two recording layers,
wherein a sum of x and y in the first recording layer is smaller than the sum of x and y in second recording layer,
wherein the first dielectric layer comprises one of a zirconium oxide-containing composite material or tantalum oxide, and
wherein the second dielectric layer comprises one of a chromium oxide-containing composite material or silicon nitride.

Assignees

• Sony Corp

Inventors

• Tabata Hiroshi

Classifications

• G11B7/257

  of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers · CPC title

• G11B7/2433

  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 · CPC title

• G06F2211/007

  Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress · CPC title

• G11B7/24038 Primary

  Multiple laminated recording layers · CPC title

• G11B7/243

  comprising inorganic materials only, e.g. ablative layers · CPC title