Optical disk and optical disk device

Abstract

An optical disk including first information layer having first guide grooves consisting of first protrusive flat portion having first width and first recessed flat portion having a second width having first height difference from the first protrusive flat portion, the first information layer being formed on the transparent substrate layer, second information layer having second guide grooves consisting of second protrusive flat portion having third width formed on second recessed flat portion having fourth width having second height difference, the second information layer, wherein cycle P (μm) of the first and second guide grooves has value ranging from 0.35 μm to 0.8 μm and has relationship of Q1=2Z1/(P−X1−Y1), Q2=2Z2/(P−X2−Y2), 0.9

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

A general architecture that implements the various feature of the invention will now be described with reference to the drawings. The drawings and the associated descriptions are provided to illustrate embodiments of the invention and not to limit the scope of the invention.

FIG. 1 is a sectional view showing an example of a size of a guide groove of a two-layered optical disk according to an embodiment of the present invention;

FIG. 2 is an illustrative view showing an example (first test data) of effects each parameter of a substrate in a two-layered optical disk according to an embodiment of the present invention has on ΔCNR1, ΔCNR2, and ΔL;

FIG. 3 is an illustrative view showing an example (second test data) of effects each parameter of a substrate in a two-layered optical disk according to an embodiment of the present invention has on ΔCNR1, ΔCNR2, and ΔL;

FIG. 4 is an illustrative view showing an example (third test data) of effects each parameter of a substrate in a two-layered optical disk according to an embodiment of the present invention has on ΔCNR1, ΔCNR2, and ΔL;

FIG. 5 is an illustrative view showing an example (fourth test data) of effects each parameter of a substrate in a two-layered optical disk according to an embodiment of the present invention has on ΔCNR1, ΔCNR2, and ΔL;

FIG. 6 is an illustrative view showing an example (fifth test data) of effects each parameter of a substrate in a two-layered optical disk according to an embodiment of the present invention has on ΔCNR1, ΔCNR2, and ΔL;

FIG. 7 is an illustrative view showing an example (sixth test data) of effects each parameter of a substrate in a two-layered optical disk according to an embodiment of the present invention has on ΔCNR1, ΔCNR2, and ΔL;

FIG. 8 is an illustrative view showing an example (seventh test data) of effects each parameter of a substrate in a,two-layered optical disk according to an embodiment of the present invention has on ΔCNR1, ΔCNR2, and ΔL;

FIG. 9 is an illustrative view showing an example (eighth test data) of effects each parameter of a substrate in a two-layered optical disk according to an embodiment of the present invention has on ΔCNR1, ΔCNR2, and ΔL;

FIG. 10 is a sectional view showing an example of another configuration of a two-layered optical disk according to an embodiment of the present invention;

FIG. 11 is a sectional view showing an example of another configuration of a two-layered optical disk according to an embodiment of the present invention;

FIG. 12 is a sectional view showing an example of another configuration of a two-layered optical disk according to an embodiment of the present invention;

FIG. 13 is a sectional view showing an example of another configuration of a two-layered optical disk according to an embodiment of the present invention;

FIG. 14 is a block diagram depicting an example of an optical disk device handling a two-layered optical disk according to an embodiment of the present invention;

FIG. 15 is an illustrative view showing an example of general parameter setting of a two-layered optical disk according to an embodiment of the present invention;

FIG. 16 is an illustrative view showing a relationship between a wobble shape and an address bit in an address bit region of a two-layered optical disk according to an embodiment of the present invention;

FIG. 17 is an illustrative layout view showing an inside of a wobble data unit relating to a primary layout position and a secondary layout position of a two-layered optical disk according to an embodiment of the present invention;

FIG. 18 is an illustrative view showing an embodiment relating to a data structure in wobble address information of a two-layered optical disk according to an embodiment of the present invention;

FIG. 19 is an illustrative view showing a layout position of a modulation region on a two-layered optical disk according to an embodiment of the present invention;

FIG. 20 is an illustrative view showing a method for measuring Wppmax and Wppmin of a two-layered optical disk according to an embodiment of the present invention;

FIG. 21 is a specific illustrative view showing a wobble signal and a track shift signal of a two-layered optical disk according to an embodiment of the present invention;

FIG. 22 is an illustrative view showing a method for measuring a (I1-I2) pp signal of a two-layered optical disk according to an embodiment of the present invention;

FIG. 23 is a block diagram depicting an NBSNR measuring circuit relevant to a square wavelength of a wobble signal of a two-layered optical disk according to an embodiment of the present invention;

FIG. 24 is an illustrative view showing a method for measuring NBSNR of a two-layered optical disk according to an embodiment of the present invention;

FIG. 25 is a graph depicting an example of a spectrum analyzer detection signal characteristic of a wobble signal based on phase modulation of a two-layered optical disk according to an embodiment of the present invention; and

FIG. 26 is a graph depicting an example of a spectrum analyzer waveform of a wobble signal based on phase modulation of a two-layered optical disk according to an embodiment of the present invention.

Claims

1. An optical disk comprising: a transparent substrate layer provided at a light incidence side;a first information layer having first guide grooves consisting of a first protrusive flat portion having a first width formed close to the light incidence side and a first recessed flat portion having a second width having a first height difference from the first protrusive flat portion and formed close to the opposite side of the light incidence side, the first information layer being formed on the transparent substrate layer;an adhesive layer formed on the information layer; anda second information layer having second guide grooves consisting of a second protrusive flat portion having a third width formed close to the light incidence side and a second recessed flat portion having a fourth width having a second height difference from the second protrusive flat portion and formed close to the opposite side of the light incidence side, the second information layer being formed on the adhesive layer;wherein a cycle P (μm) of the first and second guide grooves has a value ranging from 0.35 μm to 0.8 μm and has a relationship of Q1=2Z1/(P−X1−Y1),Q2=2Z2/(P−X2−Y2),

2. The optical disk according to claim 1, wherein the first height difference and the second height difference of the first and second guide grooves each are 0<Z1<λ/2n, 0<Z2<λ/2n (where “n” is a refractive index of a substrate having the first information layer).

3. The optical disk according to claim 1, wherein a thickness of the transparent substrate layer is within the range of 580 μm to 600 μm.

4. The optical disk according to claim 1, wherein a thickness of the adhesive layer is within the range of 20 μm to 35 μm.

5. The optical disk according to claim 1, wherein the transparent substrate layer, the first and second information layers, and the adhesive layer each have a refractive index of 3% to 10% with respect to a wavelength of a laser beam ranging from 390 nm to 420 nm.

6. The optical disk according to claim 1, wherein a reflection index from the second information layer is within the range of 0.8 time to 1.2 time with respect to a reflection index from the first information layer.

7. The optical disk according to claim 1, wherein, among the guide groves formed in the first and second information layers, recording is carried out with respect to only guide grooves closer to the laser light incidence side.

8. The optical disk according to claim 1, wherein among the guide groves formed in the first and second information layers, recording is carried out with respect to only guide grooves distant from the laser light incidence side.

9. The optical disk according to claim 1, wherein among the guide groves formed in the first and second information layers, recording is carried out with respect to both of the guide grooves.

10. An optical disk device, which carries out an information recording processing operation and a reproduction processing operation with respect to an optical disk as claimed in claim 1.

11. An optical disk comprising: a transparent substrate layer provided at a light incidence side;a first information layer having first guide grooves consisting of a first protrusive flat portion having a first width formed close to the light incidence side and a first recessed flat portion having a second width having a first height difference from the first protrusive flat portion and formed close to the opposite side of the light incidence side, the first information layer being formed on the transparent substrate layer;an adhesive layer formed on the information layer; anda second information layer having second guide grooves consisting of a second protrusive flat portion having a third width formed close to the light incidence side and a second recessed flat portion having a fourth width having a second height difference from the second protrusive flat portion and formed close to the opposite side of the light incidence side, the second information layer being formed on the adhesive layer;wherein a cycle P (μm) of the first and second guide grooves has a value ranging from 0.35 μm to 0.8 μm and has a relationship of Q1=2Z1/(P−X1−Y1),Q2=2Z2/(P−X2−Y2),

12. The optical disk according to claim 11, wherein the first height difference and the second height difference of the first and second guide grooves each are 0<Z1<λ/2n, 0<Z2<λ/2n (where “n” is a refractive index of a substrate having the first information layer).

13. The optical disk according to claim 11, wherein a thickness of the transparent substrate layer is within the range of 580 μm to 600 μm.

14. The optical disk according to claim 11, wherein a thickness of the adhesive layer is within the range of 20 μm to 35 μm.

15. The optical disk according to claim 11, wherein the transparent substrate layer, the first and second information layers, and the adhesive layer each have a refractive index of 3% to 10% with respect to a wavelength of a laser beam ranging from 390 nm to 420 nm.

16. The optical disk according to claim 11, wherein a reflection index from the second information layer is within the range of 0.8 time to 1.2 time with respect to a reflection index from the first information layer.

17. The optical disk according to claim 11, wherein, among the guide groves formed in the first and second information layers, recording is carried out with respect to only guide grooves closer to the laser light incidence side.

18. The optical disk according to claim 11, wherein among the guide groves formed in the first and second information layers, recording is carried out with respect to only guide grooves distant from the laser light incidence side.

19. The optical disk according to claim 11, wherein among the guide groves formed in the first and second information layers, recording is carried out with respect to both of the guide grooves.

20. An optical disk device, which carries out an information recording processing operation and a reproduction processing operation with respect to an optical disk as claimed in claim 11.

21. An optical disk comprising: a transparent substrate layer provided at a light incidence side;a first information layer having first guide grooves consisting of a first protrusive flat portion having a first width formed close to the light incidence side and a first recessed flat portion having a second width having a first height difference from the first protrusive flat portion and formed close to the opposite side of the light incidence side, the first information layer being formed on the transparent substrate layer;an adhesive layer formed on the information layer; anda second information layer having second guide grooves consisting of a second protrusive flat portion having a third width formed close to the light incidence side and a second recessed flat portion having a fourth width having a second height difference from the second protrusive flat portion and formed close to the opposite side of the light incidence side, the second information layer being formed on the adhesive layer;wherein a cycle P (μm) of the first and second guide grooves has a value ranging from 0.35 μm to 0.8 μm and has a relationship of Q1=2Z1/(P−X1−Y1)Q2=2Z2/(P−X2−Y2),

22. The optical disk according to claim 21, wherein the first height difference and the second height difference of the first and second guide grooves each are 0<Z1<λ/2n, 0<Z2<λ/2n (where “n” is a refractive index of a substrate having the first information layer).

23. The optical disk according to claim 21, wherein a thickness of the transparent substrate layer is within the range of 580 μm to 600 μm.

24. The optical disk according to claim 21, wherein a thickness of the adhesive layer is within the range of 20 μm to 35 μm.

25. The optical disk according to claim 21, wherein the transparent substrate layer, the first and second information layers, and the adhesive layer each have a refractive index of 3% to 10% with respect to a wavelength of a laser beam ranging from 390 nm to 420 nm.

26. The optical disk according to claim 21, wherein a reflection index from the second information layer is within the range of 0.8 time to 1.2 time with respect to a reflection index from the first information layer.

27. The optical disk according to claim 21, wherein, among the guide groves formed in the first and second information layers, recording is carried out with respect to only guide grooves closer to the laser light incidence side.

28. The optical disk according to claim 21, wherein among the guide groves formed in the first and second information layers, recording is carried out with respect to only guide grooves distant from the laser light incidence side.

29. The optical disk according to claim 21, wherein among the guide groves formed in the first and second information layers, recording is carried out with respect to both of the guide grooves.

30. An optical disk device, which carries out an information recording processing operation and a reproduction processing operation with respect to an optical disk as claimed in claim 21.

31. An optical disk comprising: a transparent substrate layer provided at a light incidence side;a first information layer having first guide grooves consisting of a first protrusive flat portion having a first width formed close to the light incidence side and a first recessed flat portion having a second width having a first height difference from the first protrusive flat portion and formed close to the opposite side of the light incidence side, the first information layer being formed on the transparent substrate layer;an adhesive layer formed on the information layer; anda second information layer having second guide grooves consisting of a second protrusive flat portion having a third width formed close to the light incidence side and a second recessed flat portion having a fourth width having a second height difference from the second protrusive flat portion and formed close to the opposite side of the light incidence side, the second information layer being formed on the adhesive layer;wherein a cycle P (μm) of the first and second guide grooves has a value ranging from 0.35 μm to 0.8 μm and has a relationship of Q1=2Z1/(P−X1−Y1),Q2=2Z2/(P−X2−Y2),

32. The optical disk according to claim 31, wherein the first height difference and the second height difference of the first and second guide grooves each are 0<Z1<λ/2n, 0<Z2<λ/2n (where “n” is a refractive index of a substrate having the first information layer).

33. The optical disk according to claim 31, wherein a thickness of the transparent substrate layer is within the range of 580 μm to 600 μm.

34. The optical disk according to claim 31, wherein a thickness of the adhesive layer is within the range of 20 μm to 35 μm.

35. The optical disk according to claim 31, wherein the transparent substrate layer, the first and second information layers, and the adhesive layer each have a refractive index of 3% to 10% with respect to a wavelength of a laser beam ranging from 390 nm to 420 nm.

36. The optical disk according to claim 31, wherein a reflection index from the second information layer is within the range of 0.8 time to 1.2 time with respect to a reflection index from the first information layer.

37. The optical disk according to claim 31, wherein, among the guide groves formed in the first and second information layers, recording is carried out with respect to only guide grooves closer to the laser light incidence side.

38. The optical disk according to claim 31, wherein among the guide groves formed in the first and second information layers, recording is carried out with respect to only guide grooves distant from the laser light incidence side.

39. The optical disk according to claim 31, wherein among the guide groves formed in the first and second information layers, recording is carried out with respect to both of the guide grooves.

40. An optical disk device, which carries out an information recording processing operation and a reproduction processing operation with respect to an optical disk as claimed in claim 31.