OPTICAL INFORMATION RECORDING MEDIUM, RECORDING/REPRODUCING METHOD THEREOF AND RECORDING/REPRODUCING APPARATUS

• US 20090323495A1
• Filed: 11/27/2006
• Published: 12/31/2009
• Est. Priority Date: 12/02/2005
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Yamada, Noboru, Doi, Yukako, Kitaura, Hideki
• Granted Patent: US 8,110,273 B2
• Time in Patent Office: Days
• US Class Current: 369/100
• CPC Class Codes: G11B 2007/25706 containing transition metal elements (Zn, Fe, Co, Ni, Pt)
• CPC Class Codes: G11B 2007/25715 containing oxygen
• CPC Class Codes: G11B 7/2578 consisting essentially of inorganic materials
• CPC Class Codes: Y10T 428/21 Circular sheet or circular blank

Abstract

An optical information recording medium, recording/reproducing method thereof, and recording/reproducing apparatus with superior signal quality for high-density recording that has high storage reliability is provided. The optical information recording medium of the present invention has at least one information layer having a recording layer and a dielectric layer in order on a transparent substrate. The dielectric layer is comprised of greater than or equal to 50 molecule percent and less than or equal to 98 molecule percent of Zn—O, and greater than or equal to 2 molecule percent to less than or equal to 50 molecule percent of one or more compounds selected from the group consisting of Y—O, Ce—O, Nb—O, Ta—O, Cr—O and Mo—O.

Claims

1. An optical information recording medium comprising at least one information layer having a recording layer and a dielectric layer in order on a transparent substrate,

the dielectric layer including greater than or equal to 50 molecule percent and less than or equal to 98 molecule percent of Zn—

O, and greater than or equal to 2 molecule percent to less than or equal to 50 molecule percent of one or more compounds selected from the group consisting of Y—

O, Ce—

O, Nb—

O, Ta—

O, Cr—

O and Mo—

O.

2. The optical information recording medium according to claim 1, wherein the information layer further comprising a reflective layer on an opposite side of the dielectric layer to the recording layer.

4. The optical information recording medium according to claim 1, wherein the recording layer includes one or more oxide base materials selected from the group consisting of Te—

O, Sb—

O, Bi—

O, Ge—

O, Sn—

O, Ga—

O and In—

O.

8. The optical information recording medium according to claim 4, wherein the recording layer further including one or more elements selected from the group consisting of Te, Sb, Bi, Ge, Sn, Ga, In, Pd, Au, Pt, Ni, Ag and Cu.

9. The optical information recording medium according to claim 1, wherein the recording layer including Te—

O—

M (where M is one or more elements selected from the group consisting of Al, Si, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ru, Rh, Pd, Ag, In, Sn, Sb, Hf, Ta, W, Re, Os, Ir, Pt, Au, and Bi).

10. The optical information recording medium according to claim 1, wherein the dielectric layer further comprising greater than or equal to 2 molecule percent to less than or equal to 40 molecule percent of one or more compounds selected from the group consisting of Al—

O, Ga—

O, In—

O, Bi—

O and Sb—

O.

11. The optical information recording medium according to claim 2, wherein the reflective layer comprising equal to or more than 95 molecule percent of Ag.

12. The optical information recording medium according to claim 11, the reflective layer including a main component of greater than or equal to 95 molecule percent and less than or equal to 99.95 molecule percent including Ag, and a sub-component of greater than or equal to 0.05 molecule percent to less than or equal to 5 molecule percent of one or more elements selected from the group consisting of Pd, Cu, Bi, Nd, Y, and Ga.

13. The optical information recording medium according to claim 1, wherein the information layer further including a protective layer on an opposite side of the recording layer to the dielectric layer.

14. The optical information recording medium according to claim 1, further comprising a protective substrate provided on the opposite side of the information layer to the transparent substrate.

15. The optical information recording medium according to claim 1, wherein the information layer having a groove with a groove pitch of less than or equal to 1 μ

m.

16. The optical information recording medium according to claim 1, further comprising one or more information layers provided between the transparent substrate and the information layers and/or on the opposite side of the information layer to the transparent substrate.

17. The recording/reproducing method for an optical information recording medium, wherein recording/reproduction is performed for the optical information recording medium according to claim 1 using an optical beam of a wavelength of less than or equal to 450 nm.

18. A recording/reproduction apparatus for an optical information recording medium comprising at least a recording/reproduction unit that irradiates the optical information recording medium according to claim 1 with an optical beam of a wavelength of less than or equal to 450 nm and performs recording/reproduction, and a detecting unit that detects light reflected by the optical information recording medium.

3. An optical information recording medium comprising at least one information layer having a write-once recording layer, a dielectric layer including greater than or equal to 50 molecule percent and less than or equal to 98 molecule percent of Zn—

O, and a reflective layer provided in order on a transparent substrate,

the reflective layer including a main component of greater than or equal to 95 molecule percent and less than or equal to 99.95 molecule percent including Ag, and a sub-component of greater than or equal to 0.05 molecule percent to less than or equal to 5 molecule percent of one or more elements selected from the group consisting of Pd, Cu, Bi, Nd, Y, and Ga.

7. The optical information recording medium according to claim 3, wherein the dielectric layer including greater than or equal to 2 molecule percent to less than or equal to 50 molecule percent of one or more compounds selected from the group consisting of Y—

O, Ce—

O, Nb—

O, Ta—

O, Cr—

O and Mo—

O.

5. An optical information recording medium with a recording layer including one or more oxide base materials selected from the group consisting of Te—

O, Sb—

O, Bi—

O, Ge—

O, Sn—

O, Ga—

O and In—

O, a dielectric layer including greater than or equal to 50 molecule percent to less than or equal to 98 molecule percent of oxide, and a reflective layer, provided in order on a transparent substrate,

the reflective layer including a main component of greater than or equal to 95 molecule percent and less than or equal to 99.95 molecule percent including Ag, and a sub-component of greater than or equal to 0.05 molecule percent to less than or equal to 5 molecule percent of one or more elements selected from the group consisting of Pd, Cu, Bi, Nd, Y, and Ga.

6. The optical information recording medium according to claim 5, wherein the oxide is Zn—

O.