Optical information recording medium, recording/reproducing method thereof and recording/reproducing apparatus

• US 8,110,273 B2
• Filed: 11/27/2006
• Issued: 02/07/2012
• Est. Priority Date: 12/02/2005
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Kitaura, Hideki, Doi, Yukako, Yamada, Noboru
• Primary Examiner(s): MULVANEY, ELIZABETH EVANS
• Application Number:
  US12/095,894
• Publication Number:
  US 20090323495A1
• Time in Patent Office: 1,898 Days
• Field of Search: 428/64.4, 430/270.12
• US Class Current: 428/64.1
• 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 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:

a transparent substrate;

at least one information layer having a recording layer and a dielectric layer this order on said transparent substrate,

wherein said recording layer includes one or more oxide base materials selected from a group consisting of Te—

O, Sb—

O, Bi—

O, Ge—

O, Sn—

O, Ga—

O and In—

O, and

said dielectric layer including greater than or equal to 60 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 40 molecule percent of one or more compounds selected from a 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 said dielectric layer includes a first side and a second side, said second side being opposite said first side, said first side of said dielectric layer being on said recording layer, and said at least one information layer further comprises a reflective layer on said second side of said dielectric layer.

7. The optical information recording medium according to claim 1, wherein said recording layer further includes one or more elements selected from the group consisting of Te, Sb, Bi, Ge, Sn, Ga, In, Pd, Au, Pt, Ni, Ag and Cu.

8. The optical information recording medium according to claim 1, wherein said recording layer includes Te—

O-M, where M is one or more elements selected from a 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.

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

O, Ga—

O, In—

O, Bi—

O and Sb—

O.

10. The optical information recording medium according to claim 2, wherein said reflective layer comprises equal to or more than 95 molecule percent of Ag.

11. The optical information recording medium according to claim 10, wherein said reflective layer includes 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 a group consisting of Pd, Cu, Bi, Nd, Y, and Ga.

12. The optical information recording medium according to claim 1, wherein said recording layer has a first side and a second side, said second side being opposite said first side, said dielectric layer being on said first side of said recording layer, and said information layer further includes a protective layer on said second side of said recording layer.

13. The optical information recording medium according to claim 1, wherein said information layer includes a first side and a second side, said first side being opposite said second side, said transparent substrate being on said first side of said information layer, and said optical information recording medium further comprising a protective substrate disposed on said second side of said information layer.

14. The optical information recording medium according to claim 1, wherein said information layer has a groove with a groove pitch of less than or equal to 1 μ

m.

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

16. A recording/reproducing method for an optical information recording medium, said method comprising:

performing recording/reproduction 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.

17. A recording/reproduction apparatus for an optical information recording medium, said apparatus comprising:

at least a recording/reproduction unit configured to irradiate 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 configured to perform recording/reproduction, and a detecting unit configured to detect light reflected by the optical information recording medium.

3. An optical information recording medium comprising:

a transparent substrate; and

at least one information layer having a write-once recording layer, a dielectric layer including greater than or equal to 60 molecule percent and less than or equal to 98 molecule percent of Zn—

O, and a reflective layer disposed in this order on said transparent substrate,

said 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 a group consisting of Pd, Cu, Bi, Nd, Y, and Ga.

6. The optical information recording medium according to claim 3, wherein said dielectric layer includes 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.

4. An optical information recording medium comprising:

a transparent substrate;

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 60 molecule percent to less than or equal to 98 molecule percent of Zn—

O, and a reflective layer, disposed in this order on said transparent substrate,

said 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.

5. The optical information recording medium according to claim 4, wherein the oxide is Zn—

O.