Optical recording medium using scattering bodies to enhance modulation

• US 6,848,115 B2
• Filed: 10/04/2001
• Issued: 01/25/2005
• Est. Priority Date: 10/06/2000
• Status: Expired due to Fees

• Current Assignee: Pioneer Corporation
• Original Assignee: Pioneer Corporation
• Inventors: Yamakawa, Yuzo, Sugiura, Satoshi, Tachibana, Akihiro
• Primary Examiner(s): Psitos, Aristotelis
• Application Number:
  US09/969,590
• Publication Number:
  US 20020051422A1
• Time in Patent Office: 1,209 Days
• Field of Search: 369/13.41, 369/275.1, 428/64.4
• US Class Current: 720/719
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: G11B 2007/24308 transition metal elements of group 11 (Cu, Ag, Au)
• CPC Class Codes: G11B 7/0052 involving reflectivity, absorption or colour changes
• CPC Class Codes: G11B 7/24 Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the arrangement of information on the carrier G11B7/007
• CPC Class Codes: G11B 7/243 comprising inorganic materials only, e.g. ablative layers
• CPC Class Codes: G11B 7/257 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

Abstract

In an optical recording medium having a super-resolution layer structure using near-field light, comprising a readout layer 3 for forming a light scattering region 9 in the center portion of a laser spot, and a recording layer 5 for receiving near-field light 10 generated from the light scattering region 9 of the readout layer 3, scattering bodies 61 for increasing the generated near-field light are provided while enhancing a scattering effect of the near-field light 10 applied to a mark 51 of the recording layer 5.

Claims

1. An optical recording medium having a super-resolution layer structure using near-field light, comprising:

a readout layer for forming the near-field light in the center portion of a laser spot;

a recording layer for receiving the near-field light generated in the readout layer; and

a scattering bodies layer containing scattering bodies for enhancing a scattering effect of the near-field light.

2. The optical recording medium as defined in claim 1, wherein said scattering bodies are made of metal.

3. The optical recording medium as defined in claim 2, wherein said scattering bodies are made of gold.

4. The optical recording medium as defined in claim 1, wherein said scattering bodies are made of particulate matter.

5. The optical recording medium as defined in claim 1, wherein said scattering bodies are formed in a line shape.

6. The optical recording medium as claimed in claim 1, wherein the scattering bodies are arranged in lines perpendicular to a reading direction of a pickup.

7. The optical recording medium as claimed in claim 6, wherein a width of the scattering bodies is smaller than a width of a mark recorded in the recording layer.

8. The optical recording medium as claimed in claim 6, wherein a pitch of the lines of scattering bodies is smaller than a pitch of marks recorded in the recording layer.

9. The optical recording medium as claimed in claim 6, wherein the lines of scattering bodies are disposed in a vicinity of edges of marks recorded in the recording layer when viewed along a propagating direction of a laser forming the laser spot.

10. The optical recording medium as claimed in claim 6, wherein the lines of scattering bodies are disposed in a vicinity of centers of marks recorded in the recording layer when viewed along a propagating direction of a laser forming the laser spot.

11. The optical recording medium as claimed in claim 1, wherein the scattering bodies are arranged in lines parallel to a reading direction of a pickup.

12. The optical recording medium as claimed in claim 11, wherein a width of the scattering bodies is smaller than a width of a mark recorded in the recording layer.

13. The optical recording medium as claimed in claim 11, wherein a pitch of the lines of scattering bodies is smaller than a pitch of marks recorded in the recording layer.

14. The optical recording medium as claimed in claim 11, wherein the lines of scattering bodies are disposed in a vicinity of edges of marks recorded in the recording layer when viewed along a propagating direction of a laser forming the laser spot.

15. The optical recording medium as claimed in claim 11, wherein the lines of scattering bodies are disposed in a vicinity of centers of marks recorded in the recording layer when viewed along a propagating direction of a laser forming the laser spot.

16. An optical recording medium having a super-resolution layer structure using near-field light, comprising:

a readout layer for forming the near-field light in the center portion of a laser spot;

a recording layer for receiving the near-field light generated in the readout layer;

scattering bodies for enhancing a scattering effect of the near-field light; and

a scattering body holding layer for holding said scattering bodies, said scattering body holding layer being provided at an opposite side of said readout layer with the recording layer sandwiched.

17. An optical recording medium having a super-resolution layer structure using near-field light, comprising:

a readout layer for forming the near-field light in the center portion of a laser spot;

a recording layer for receiving the near-field light generated in the readout layer; and

scattering bodies for enhancing a scattering effect of the near-field light, wherein said scattering bodies are provided in said recording layer.

18. An optical recording medium having a super-resolution layer structure using near-field light, comprising:

a readout layer for forming the near-field light in the center portion of a laser spot;

a recording layer for receiving the near-field light generated in the readout layer;

scattering bodies for enhancing a scattering effect of the near-field light; and

a scattering body holding layer for holding said scattering bodies, said scattering body holding layer being provided between said recording layer and said readout layer.

19. An optical recording medium, comprising:

a first layer in which receives a light beam, wherein near-field light is formed in the first layer in a footprint of the light beam; and

a second layer that receives the near-field light and that records data as marks; and

scattering bodies for enhancing a scattering effect of the near-field light,

wherein the scattering bodies are formed in lines, and

wherein the lines are disposed in a vicinity of at least one of centers and edges of the marks when viewed along a propagating direction of the light beam.

20. The optical recording medium as claimed in claim 19, wherein the lines of scattering bodies are arranged parallel to a reading direction of a pickup.

21. The optical recording medium as claimed in claim 19, wherein the lines of scattering bodies are arranged perpendicular to a reading direction of a pickup.

22. The optical recording medium as claimed in claim 19, wherein a width of the scattering bodies is smaller than a width of the marks recorded in the recording layer.

23. The optical recording medium as claimed in claim 19, wherein a pitch of the lines of scattering bodies is smaller than a pitch of the marks recorded in the recording layer.

24. The optical recording medium as claimed in claim 19, wherein the lines of scattering bodies are disposed in the vicinity of the edges of the marks.

25. The optical recording medium as claimed in claim 19, wherein the lines of scattering bodies are disposed in the vicinity of the centers of the marks.