Disc-shaped recording medium, disc driving device and disc producing method

• US 7,221,644 B2
• Filed: 05/22/2003
• Issued: 05/22/2007
• Est. Priority Date: 05/24/2002
• Status: Expired due to Term

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.), Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation), Sony Corporation (Sony Group Corp.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.), Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation), Sony Corporation (Sony Group Corp.)
• Inventors: Kadowaki, Shin-ichi, Schep, Cornelis Marinus, Kobayashi, Shoei, Ishida, Takashi, Yamagami, Tamotsu, Borg, Hermanus Johannes
• Primary Examiner(s): Edun; Muhammad
• Application Number:
  US10/515,191
• Publication Number:
  US 20060098558A1
• Time in Patent Office: 1,461 Days
• Field of Search: None
• US Class Current: 369/275.5
• CPC Class Codes: G11B 7/00736 Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information sector headers or adresses in prepits G11B7/00745; address data in track wobble G11B7/24082
• CPC Class Codes: G11B 7/24038 Multiple laminated recording layers

Abstract

With the disc-shaped recording medium, or the disc manufacturing method according to the present invention, for both the single-layer disc and the multi-layer disc, a recording layer L0, which is to be the first layer, is at the same distance, along the direction of disc thickness, from the surface of the cover layer CVLs on which falls the laser light. For the multi-layer disc, the second layer L1 and the following layer(s) are formed at the locations which are closer to the cover layer CVLs than the first layer L0. Management information may be recorded by mobbling grooves, each layermay have tert areas, defect information, a replacement area. Thus, it is possible to improve compatibility, reliability and accessibility between a single-layer disc and a multi-layer disc. The spherical aberration for the recording/reproducing light may be controlled with respect to the selected layer.

Claims

1. In a disc-shaped recording medium which may be a single-layer disc, having a single recording layer, or a multi-layer disc having a plurality of recording layers, a disc-shaped recording medium which is said multi-layer recording medium wherein

the recording layer as a first recording layer is formed at such a position in a direction of thickness of the disc that the distance from the surface of a cover layer on which the light enters for recording and/or reproduction to the first recording layer is the same as the distance in case of said single layer disc;

and wherein

the second recording layer is formed at such position which is closer to said cover layer surface than said first layer.

2. The disc-shaped multi-layer recording medium according to claim 1, wherein the second recording layer is formed of a plurality of recording layers.

3. The disc-shaped multi-layer recording medium according to claim 1 wherein, of the first to the n-th recording layers, odd-numbered recording layers are recorded and/or reproduced from the inner rim towards the outer rim of the disc, and even-numbered recording layers are recorded and/or reproduced from the outer rim towards the inner rim of the disc.

4. The disc-shaped multi-layer recording medium according to claim 1 wherein the addresses of odd-numbered recording layers of the first to the n-th recording layers are sequentially recorded from the inner rim towards the outer rim of the disc, and wherein the addresses of even-numbered recording layers are obtained on complementing the addresses of the odd-numbered recording layers at the positions radially corresponding to said addresses of the even-numbered recording layers, are recorded from the outer rim towards the inner rim of the disc.

5. The disc-shaped multi-layer recording medium according to claim 1 wherein a unique ID proper to the disc-shaped recording medium is recorded only in the first recording layer by a recording system of burning off the recording layer.

6. The disc-shaped multi-layer recording medium according to claim 1 wherein the management information for recording and/or reproduction is recorded as replay-only information in each of the first to the n-th recording layers by wobbling a groove formed for spirally extending in said disc.

7. The disc-shaped multi-layer recording medium according to claim 1 wherein a test area for conducting a recording test is provided in each of said first to n-th recording layers.

8. The disc-shaped multi-layer recording medium according to claim 1 wherein an area for recording the defect management information for each of said first to n-th recording layers is provided in each of said first to n-th recording layers.

9. The disc-shaped multi-layer recording medium according to claim 1 wherein a replacement area is provided in each of said first to n-th recording layers.

10. A disc driving apparatus for recording and/or reproducing a disc-shaped recording medium which may be a single-layer disc, having a single recording layer, or a multi-layer disc having a plurality of recording layers, wherein

the recording layer as a first recording layer of said multi-layer disc is formed at such a position in a direction of thickness of the disc that the distance from the surface of a cover layer on which the light enters for recording and/or reproduction to the first recording layer is the same as the distance in case of said single layer disc;

and wherein

the second recording layer is formed at such position which is closer to said cover layer surface than said first layer;

said apparatus comprising;

head means for illuminating the laser light for recording and/or reproducing data for a track of each of said recording layers;

correction means for correcting the spherical aberration of said laser light; and

correction controlling means for controlling said correction means, in dependence upon the recording layer to be illuminated by said laser light to correct spherical aberration in dependence upon the recording layer.

11. The disc driving apparatus according to claim 10, wherein the second recording layer is formed of a plurality of recording layers.

12. The disc driving apparatus according to claim 10 wherein said correction controlling means causes said correction means to execute spherical aberration correction for said first layer, on loading of said disc-shaped recording medium, without regard to the disc type.

13. The disc driving apparatus according to claim 10 wherein a unique ID proper to the disc-shaped recording medium, recorded in said first layer by a recording system of burning off the layer, is read out on loading the disc-shaped recording medium.

14. The disc driving apparatus according to claim 10 wherein, when the multi-layer disc having n recording layers is loaded, the management information for recording and/or reproduction, recorded as the replay-only information by wobbling a spirally formed groove, is read out from one or more of the first to the n-th recording layers of the disc.

15. The disc driving apparatus according to claim 10 wherein, when the multi-layer disc having n recording layers is loaded, test recording is carried out in a test area provided in each of said first to n-th recording layers.

16. The disc driving apparatus according to claim 10 wherein, when the multi-layer disc having n recording layers is loaded, the defect management information for the first to the n-th recording layers is recorded in a defect management area provided in each of said first to n-th recording layers.

17. The disc driving apparatus according to claim 10 wherein, when the multi-layer disc having n recording layers is loaded, recording and/or reproduction is sequentially prosecuted from the first to the n-th recording layers.

18. The disc driving apparatus according to claim 10 wherein, in recording and/or reproducing odd-numbered recording layers of said disc-shaped recording medium, recording and/or reproduction is executed from the inner rim towards the outer rim of the disc, and wherein, in recording and/or reproducing even-numbered recording layers of said disc-shaped recording medium, recording and/or reproduction is executed from the outer rim towards the inner rim of the disc.

19. A method for producing, of a single-layer disc, having a single recording layer, and a multi-layer disc, having a plurality of recording layers, a disc-shaped recording medium which is said multi-layer recording medium, said method comprising:

forming the recording layer as a first recording layer at such a position in a direction of thickness of the disc that the distance from the surface of a cover layer on which the light enters for recording and/or reproduction to the first recording layer is the same as the distance in case of said single layer disc; and

forming the second layer at such position which is closer to said cover layer surface than said first layer.

20. The method for producing a disc-shaped multi-layer recording medium according to claim 19 wherein, the second recording layer is formed of a plurality of recording layers.

21. The method for producing a disc-shaped multi-layer recording medium according to claim 19 wherein, of the first to the n-th recording layers, odd-numbered recording layers are recorded and/or reproduced from the inner rim towards the outer rim of the disc, and even-numbered recording layers are recorded and/or reproduced from the outer rim towards the inner rim of the disc.

22. The method for producing a disc-shaped multi-layer recording medium according to claim 19 wherein the addresses of odd-numbered recording layers of the first to the n-th recording layers are sequentially recorded from the inner rim towards the outer rim of the disc, and wherein the addresses of even-numbered recording layers are obtained on complementing the addresses of the odd-numbered recording layers at the positions radially corresponding to said addresses of the even-numbered recording layers, and are recorded from the outer rim towards the inner rim of the disc.

23. The method for producing a disc-shaped multi-layer recording medium according to claim 19 wherein a unique ID proper to the disc-shaped recording medium is recorded only in the first recording layer by a recording system of burning off the recording layer.

24. The method for producing a disc-shaped multi-layer recording medium according to claim 19 wherein the management information for recording and/or reproduction is recorded as replay-only information in each of the first to the n-th recording layers by wobbling a groove formed for spirally extending in said disc.

25. The method for producing a disc-shaped multi-layer recording medium according to claim 19 wherein a test area for conducting a recording test is provided in each of said first to n-th recording layers.

26. The method for producing a disc-shaped multi-layer recording medium according to claim 19 wherein an area for recording the defect management information for each of said first to n-th recording layers is provided in each of said first to n-th recording layers.

27. The method for producing a disc-shaped multi-layer recording medium according to claim 19 wherein a replacement area is provided in each of said first to n-th recording layers.