US5407720A
Expired / Lapsed
US
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Optical recording medium and process for producing the same
Assignee: Canon Inc
•
Filing: 1993-11-16
•
Granted: 1995-04-18
•
Expires: 2013-11-16
Abstract
Abstract An optical recording medium has tracking tracks and recording tracks interposed between the tracking tracks. The width of the recording tracks in a specific region is larger than that in other region.
Inventors
- 👤 Hiroshi Omata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:21
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; G11B7/261; G11B11/00; G11B11/10; G11B11/105; G11B11/1055; G11B11/10576; G11B11/10578; G11B11/10582; G11B11/10584; G11B7/007; G11B7/00745; G11B7/2407; G11B7/24073; G11B7/24079; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 99
Claim 1
Independent Claim
61 words
An optical recording medium which comprises: tracking tracks and recording tracks interposed between the tracking tracks, the width l 3 of the tracking tracks in a specific region and the width l 1 of the tracking tracks in another region have the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 2
Dependent Claim
61 words
An optical recording medium which comprises: tracking tracks and recording tracks interposed between the tracking tracks, the width l 3 of the tracking tracks in a specific region and the width l 1 of the tracking tracks in another region have the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 3
Dependent Claim
17 words
An optical recording medium according to claim 1, wherein the specific region is a closest prepit region.
Claim 4
Dependent Claim
48 words
An optical recording medium according to claim 1, wherein the width of the recording tracks in the specific region is smaller than the diameter of a light beam spot which a light beam for either recording or reproducing, or both recording and reproducing forms on a substrate surface.
Claim 5
Dependent Claim
39 words
An optical recording medium according to claim 1, wherein width l 4 of the recording tracks in the specific region and width l 2 of the recording tracks in the another region have the following relationship: 0.7≦l.sub.2 /l.sub.4 ≦1.0.
Claim 6
Dependent Claim
15 words
An optical recording medium according to claim 4, wherein the relationship is: 0.7≦l.sub.2 /l.sub.4 ≦0.8.
Claim 7
Dependent Claim
15 words
An optical recording medium according to claim 1, wherein the relationship is: 0.7≦l.sub.3 /l.sub.1 ≦0.95.
Claim 8
Dependent Claim
27 words
An optical recording medium according to claim 1, wherein the optical recording medium is used in a recording apparatus for detecting tracking errors by a push-pull method.
Claim 9
Dependent Claim
27 words
An optical recording medium according to claim 1, wherein the optical recording medium is used in a reproduction apparatus for detecting tracking errors by a push-pull method.
Claim 10
Dependent Claim
18 words
An optical recording medium according to claim 1, wherein the tracking tracks are grooves formed on a substrate.
Claim 11
Dependent Claim
47 words
An optical recording medium according to claim 9, wherein the depth of the grooves is set to be smaller than λ/4n, but larger than λ/8n, where λ is the wavelength of an irradiating light beam irradiating the substrate and n is the refractive index of the substrate.
Claim 12
Dependent Claim
24 words
An optical recording medium according to claim 10, wherein the depth of the grooves is not more than λ/5n, but not less than λ/7n.
Claim 13
Dependent Claim
24 words
An optical recording medium according to claim 11, wherein the depth of the grooves is not more than λ/5n, but not less than λ/6n.
Claim 14
Dependent Claim
17 words
An optical recording medium according to claim 1, wherein the specific region is region between the prepits.
Claim 15
Dependent Claim
17 words
An optical recording medium according to claim 1, wherein said optical recording medium is an optomagnetic medium.
Claim 16
Dependent Claim
36 words
An optical recording medium according to claim 1, wherein a width l 4 of the recording tracks in the specific region is larger than a width l 2 of the recording tracks in the another region.
Claim 17
Dependent Claim
59 words
An optical recording medium which comprises: tracking grooves and recording tracks interposed between the tracking grooves, the depth d 2 of a groove in a specific region and the depth d 1 of a groove in another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 18
Dependent Claim
59 words
An optical recording medium which comprises: tracking grooves and recording tracks interposed between the tracking grooves, the depth d 2 of a groove in a specific region and the depth d 1 of a groove in another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 19
Dependent Claim
17 words
An optical recording medium according to claim 16, wherein the specific region is a closest prepit region.
Claim 20
Dependent Claim
27 words
An optical recording medium according to claim 16, wherein the optical recording medium is used in a recording apparatus for detecting tracking errors by a push-pull method.
Claim 21
Dependent Claim
27 words
An optical recording medium according to claim 16, wherein the optical recording medium is used in a reproduction apparatus for detecting tracking errors by a push-pull method.
Claim 22
Dependent Claim
16 words
An optical recording medium according to claim 16, wherein the grooves are formed on a substrate.
Claim 23
Dependent Claim
48 words
An optical recording medium according to claim 20, wherein the depth d 1 of the grooves in the another region satisfies the following relationship: λ/8n≦d.sub.1 ≦λ/4n wherein λ is the wavelength of an irradiating light beam irradiating the substrate and n is the refractive index of the substrate.
Claim 24
Dependent Claim
19 words
An optical recording medium according to claim 21, wherein the depth d 1 satisfies the following relationship: λ/7n≦d.sub.1 ≦λ/5n.
Claim 25
Dependent Claim
19 words
An optical recording medium according to claim 22, wherein the depth d 1 satisfies the following relationship: λ/6n≦d.sub.1 ≦λ/5n.
Claim 26
Dependent Claim
25 words
An optical recording medium according to claim 16, wherein depth d 2 of the grooves in the specific region satisfies the following relationship: λ/8n≦d.sub.2 ≦d.sub.1.
Claim 27
Dependent Claim
19 words
An optical recording medium according to claim 24, wherein the depth d 2 satisfies the following relationship: λ/8n≦d.sub.2 ≦λ/6n.
Claim 28
Dependent Claim
19 words
An optical recording medium according to claim 16, wherein the optical recording medium is a disk-type, optical recording medium.
Claim 29
Dependent Claim
17 words
An optical recording medium according to claim 16, wherein the specific region is region between the prepits.
Claim 30
Dependent Claim
17 words
An optical recording medium according to claim 16, wherein said optical recording medium is an optomagnetic medium.
Claim 31
Dependent Claim
92 words
An optical recording medium which comprises: tracking grooves and recording tracks interposed between the tracking grooves, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, and the depth d 2 of the groove in the specific region and the depth d 1 of a groove in the another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 32
Dependent Claim
92 words
An optical recording medium which comprises: tracking grooves and recording tracks interposed between the tracking grooves, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, and the depth d 2 of the groove in the specific region and the depth d 1 of a groove in the another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 33
Dependent Claim
17 words
An optical recording medium according to claim 29, wherein said optical recording medium is an optomagnetic medium.
Claim 34
Dependent Claim
17 words
An optical recording medium according to claim 29, wherein the specific region is a closest prepit region.
Claim 35
Dependent Claim
52 words
An optical recording medium according to claim 29, wherein the width of the recording tracks in the specific region is smaller than the diameter of a light beam spot which a light beam for either recording or reproducing, or both recording and reproducing forms on a substrate surface of the recording medium.
Claim 36
Dependent Claim
41 words
An optical recording medium according to claim 29, wherein the width l 4 of the recording tracks in the specific region and the width l 2 of the recording tracks in the another region having the following relationship: 0.7≦l.sub.3 /l.sub.4 ≦1.0.
Claim 37
Dependent Claim
22 words
An optical recording medium according to claim 33, wherein the relationship of widths l 2 and l 4 is: 0.7≦l.sub.2 /l.sub.4 ≦0.8.
Claim 38
Dependent Claim
22 words
An optical recording medium according to claim 33, wherein the relationship of widths l 3 and l 1 is: 0.7≦l.sub.3 /l.sub.1 ≦0.95.
Claim 39
Dependent Claim
30 words
An optical recording medium according to claim 29, wherein said optical recording medium comprises means for being used in a recording apparatus for detecting tracking errors by a push-pull method.
Claim 40
Dependent Claim
30 words
An optical recording medium according to claim 29, wherein said optical recording medium comprises means for being used in a reproducing apparatus for detecting tracking errors by a push-pull method.
Claim 41
Dependent Claim
17 words
An optical recording medium according to claim 29, wherein the specific region is a region between prepits.
Claim 42
Dependent Claim
17 words
An optical recording medium according to claim 29, wherein the tracking grooves are formed on a substrate.
Claim 43
Dependent Claim
50 words
An optical recording medium according to claim 29, wherein the depth d 1 of the grooves in the another region satisfies the following relationship: λ/8n≦d.sub.1 ≦λ/4n wherein λ is the wavelength of an irradiating light beam irradiating the optical recording medium and n is the refractive index of the substrate.
Claim 44
Dependent Claim
19 words
An optical recording medium according to claim 40, wherein the depth d 1 satisfies the following relationship: λ/7n≦d.sub.1 ≦λ/5n.
Claim 45
Dependent Claim
19 words
An optical recording medium according to claim 41, wherein the depth d 1 satisfies the following relationship: λ/6n≦d.sub.1 ≦λ/5n.
Claim 46
Dependent Claim
26 words
An optical recording medium according to claim 29, wherein the depth d 2 of the groove in the specific region satisfies the following relationship: λ/8n≦d.sub.2 ≦d.sub.1.
Claim 47
Dependent Claim
26 words
An optical recording medium according to claim 29, wherein the depth d 2 of the groove in the specific region satisfies the following relationship: λ/8n≦d.sub.2 ≦λ/6n.
Claim 48
Dependent Claim
19 words
An optical recording medium according to claim 29, wherein the optical recording medium is a disk-type optical recording medium.
Claim 49
Dependent Claim
35 words
An optical recording medium according to claim 29, wherein a width l 4 of the recording tracks in the specific region is larger than width l 2 of the recording tracks in the another region.
Claim 50
Dependent Claim
66 words
A substrate for an optical recording medium which comprises: tracking tracks and recording tracks interposed between the tracking tracks, the width l 3 of the tracking tracks in a specific region and the width l 1 of the tracking tracks in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95 /--13 -- the specific region being a prepit region provided with prepits on the recording track.
Claim 51
Dependent Claim
66 words
A substrate for an optical recording medium which comprises: tracking tracks and recording tracks interposed between the tracking tracks, the width l 3 of the tracking tracks in a specific region and the width l 1 of the tracking tracks in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95 /--13 -- the specific region being a prepit region provided with prepits on the recording track.
Claim 52
Dependent Claim
63 words
A substrate for an optical recording medium, which comprises: tracking grooves and recording tracks interposed between the tracking grooves, the depth d 2 of a groove in a specific region and the depth d 1 of the groove in the another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 53
Dependent Claim
63 words
A substrate for an optical recording medium, which comprises: tracking grooves and recording tracks interposed between the tracking grooves, the depth d 2 of a groove in a specific region and the depth d 1 of the groove in the another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 54
Dependent Claim
95 words
A substrate for an optical recording medium, which comprises: tracking grooves and recording tracks interposed between the tracking grooves, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, and the depth d 2 of a groove in the specific region and the depth d 1 of the groove in the another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 55
Dependent Claim
95 words
A substrate for an optical recording medium, which comprises: tracking grooves and recording tracks interposed between the tracking grooves, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, and the depth d 2 of a groove in the specific region and the depth d 1 of the groove in the another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 56
Dependent Claim
112 words
An optical recording medium which comprises: tracking grooves and a recording track interposed between the tracking grooves, the depth d 2 of a groove in a specific region being smaller than the depth d 1 of a groove in another region, the depth d 1 satisfying the following relationship: λ/7n/≦d.sub.1 ≦λ/5n, and the depth d 2 satisfying the following relationship: λ/8n/≦d.sub.2 ≦λ/6n, the specific region being a prepit region provided with prepits on the recording track, and wherein X is the wavelength of a reproducing beam to reproduce information from the optical recording medium and n is the refractive index of a substrate on which the grooves and recording track are formed.
Claim 57
Dependent Claim
112 words
An optical recording medium which comprises: tracking grooves and a recording track interposed between the tracking grooves, the depth d 2 of a groove in a specific region being smaller than the depth d 1 of a groove in another region, the depth d 1 satisfying the following relationship: λ/7n/≦d.sub.1 ≦λ/5n, and the depth d 2 satisfying the following relationship: λ/8n/≦d.sub.2 ≦λ/6n, the specific region being a prepit region provided with prepits on the recording track, and wherein X is the wavelength of a reproducing beam to reproduce information from the optical recording medium and n is the refractive index of a substrate on which the grooves and recording track are formed.
Claim 58
Dependent Claim
140 words
An optical recording medium which comprises: tracking grooves and a recording track interposed between the tracking grooves, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the depth d 2 of a groove in the specific region being smaller than the depth d 1 of a groove in the another region, the depth d 1 satisfying the following relationship: λ/7n≦d.sub.1 ≦λ/5n, and the depth d 2 satisfying in the following relationship: λ/8n≦d.sub.2 ≦λ/6n, the specific region being a prepit region provided with prepits on the recording track, wherein λ is the wavelength of a reproducing beam reproducing information from the optical recording medium and n is the refractive index of a substrate on which the grooves are formed.
Claim 59
Dependent Claim
140 words
An optical recording medium which comprises: tracking grooves and a recording track interposed between the tracking grooves, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the depth d 2 of a groove in the specific region being smaller than the depth d 1 of a groove in the another region, the depth d 1 satisfying the following relationship: λ/7n≦d.sub.1 ≦λ/5n, and the depth d 2 satisfying in the following relationship: λ/8n≦d.sub.2 ≦λ/6n, the specific region being a prepit region provided with prepits on the recording track, wherein λ is the wavelength of a reproducing beam reproducing information from the optical recording medium and n is the refractive index of a substrate on which the grooves are formed.
Claim 60
Dependent Claim
102 words
A substrate for an optical recording medium, which comprises: tracking grooves and a recording track interposed between the tracking grooves, the depth d 2 of a groove in a specific region being smaller than the depth d 1 of a groove in another region, the depth d 1 satisfying the following relationship: λ/7n≦d.sub.1 ≦λ/5n the depth d 2 satisfying the following relationship: λ/8n≦d.sub.2 ≦λ/6n the specific region being a prepit region provided with prepits on the recording track, wherein λ is the wavelength of a reproducing beam reproducing information on the substrate and wherein n is the refractive index of the substrate.
Claim 61
Dependent Claim
102 words
A substrate for an optical recording medium, which comprises: tracking grooves and a recording track interposed between the tracking grooves, the depth d 2 of a groove in a specific region being smaller than the depth d 1 of a groove in another region, the depth d 1 satisfying the following relationship: λ/7n≦d.sub.1 ≦λ/5n the depth d 2 satisfying the following relationship: λ/8n≦d.sub.2 ≦λ/6n the specific region being a prepit region provided with prepits on the recording track, wherein λ is the wavelength of a reproducing beam reproducing information on the substrate and wherein n is the refractive index of the substrate.
Claim 62
Dependent Claim
65 words
A substrate for an optical recording medium, which comprises: tracking grooves and a recording track interposed between the tracking grooves, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 63
Dependent Claim
65 words
A substrate for an optical recording medium, which comprises: tracking grooves and a recording track interposed between the tracking grooves, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 64
Dependent Claim
70 words
An optical recording medium comprising: a substrate and a recording layer, the substrate comprising tracking tracks and a recording track interposed between the tracking tracks, the width l 3 of a tracking track in a specific region and the width l 1 of a tracking track in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 65
Dependent Claim
70 words
An optical recording medium comprising: a substrate and a recording layer, the substrate comprising tracking tracks and a recording track interposed between the tracking tracks, the width l 3 of a tracking track in a specific region and the width l 1 of a tracking track in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 66
Dependent Claim
68 words
An optical recording medium comprising: a substrate and a recording layer, the substrate comprising tracking grooves and a recording track interposed between the tracking grooves, the depth d 2 of a groove in a specific region and the depth d 1 of a groove in another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 67
Dependent Claim
68 words
An optical recording medium comprising: a substrate and a recording layer, the substrate comprising tracking grooves and a recording track interposed between the tracking grooves, the depth d 2 of a groove in a specific region and the depth d 1 of a groove in another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 68
Dependent Claim
72 words
An optical recording medium which comprises: tracking tracks and recording tracks interposed between the tracking tracks, wherein the relationship between the width l 3 of the tracking tracks in a prepit region provided with prepits on the recording track and the width l 1 of the tracking tracks in another region is set so that offset quantities of a tracking error signal in the prepit region and another region are substantially equal.
Claim 69
Dependent Claim
72 words
An optical recording medium which comprises: tracking tracks and recording tracks interposed between the tracking tracks, wherein the relationship between the width l 3 of the tracking tracks in a prepit region provided with prepits on the recording track and the width l 1 of the tracking tracks in another region is set so that offset quantities of a tracking error signal in the prepit region and another region are substantially equal.
Claim 70
Dependent Claim
70 words
An optical recording medium which comprises: tracking grooves and recording tracks interposed between the tracking grooves, wherein the relation between the depth d 2 of a groove in a prepit region provided with prepits on the recording track and the depth d 1 of a groove in another region is set so that offset quantities of a tracking error signal in the prepit region and another region are substantially equal.
Claim 71
Dependent Claim
70 words
An optical recording medium which comprises: tracking grooves and recording tracks interposed between the tracking grooves, wherein the relation between the depth d 2 of a groove in a prepit region provided with prepits on the recording track and the depth d 1 of a groove in another region is set so that offset quantities of a tracking error signal in the prepit region and another region are substantially equal.
Claim 72
Dependent Claim
60 words
An optical recording medium which comprises: a tracking track and a recording track adjacent thereto, the width l 3 of the tracking track in a specific region and the width l 1 of the tracking track in another region have the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95 the specific region being a prepit region provided with prepits on the recording track.
Claim 73
Dependent Claim
60 words
An optical recording medium which comprises: a tracking track and a recording track adjacent thereto, the width l 3 of the tracking track in a specific region and the width l 1 of the tracking track in another region have the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95 the specific region being a prepit region provided with prepits on the recording track.
Claim 74
Dependent Claim
58 words
An optical recording medium which comprises: a tracking groove and a recording track adjacent thereto, the depth d 2 of a groove in a specific region and the depth d 1 of a groove in another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 75
Dependent Claim
58 words
An optical recording medium which comprises: a tracking groove and a recording track adjacent thereto, the depth d 2 of a groove in a specific region and the depth d 1 of a groove in another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 76
Dependent Claim
91 words
An optical recording medium which comprises: a tracking groove and a recording track adjacent thereto, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, and the depth d 2 of the groove in the specific region and the depth d 1 of a groove in the another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 77
Dependent Claim
91 words
An optical recording medium which comprises: a tracking groove and a recording track adjacent thereto, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, and the depth d 2 of the groove in the specific region and the depth d 1 of a groove in the another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 78
Dependent Claim
60 words
A substrate for an optical recording medium which comprises: a tracking track and a recording track adjacent thereto, the width l 3 of in a specific region and the width l 1 of the tracking tracks in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 79
Dependent Claim
60 words
A substrate for an optical recording medium which comprises: a tracking track and a recording track adjacent thereto, the width l 3 of in a specific region and the width l 1 of the tracking tracks in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 80
Dependent Claim
62 words
A substrate for an optical recording medium, which comprises: a tracking groove and a recording track adjacent thereto, the depth d 2 of a groove in a specific region and the depth d 1 of the groove in the another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 81
Dependent Claim
62 words
A substrate for an optical recording medium, which comprises: a tracking groove and a recording track adjacent thereto, the depth d 2 of a groove in a specific region and the depth d 1 of the groove in the another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 82
Dependent Claim
94 words
A substrate for an optical recording medium, which comprises: a tracking groove and a recording track adjacent thereto, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.5 ≦0.95, and the depth d 2 of a groove in the specific region and the depth d 1 of the groove in the another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 83
Dependent Claim
94 words
A substrate for an optical recording medium, which comprises: a tracking groove and a recording track adjacent thereto, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.5 ≦0.95, and the depth d 2 of a groove in the specific region and the depth d 1 of the groove in the another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 84
Dependent Claim
109 words
An optical recording medium which comprises: a tracking groove and a recording track adjacent thereto, the depth d 2 of a groove in a specific region being smaller than the depth d 1 of a groove in another region, the depth d 1 satisfying the following relationship: λ/7n≦d.sub.1 ≦λ/5n, and the depth d 2 satisfying the following relationship: λ/8n≦d2≦λ/6n, the specific region being a prepit region provided with prepits on the recording track, and wherein λ is the wavelength of a reproducing beam to reproduce information from the optical recording medium and n is the refractive index of a substrate on which the grooves and recording track are formed.
Claim 85
Dependent Claim
109 words
An optical recording medium which comprises: a tracking groove and a recording track adjacent thereto, the depth d 2 of a groove in a specific region being smaller than the depth d 1 of a groove in another region, the depth d 1 satisfying the following relationship: λ/7n≦d.sub.1 ≦λ/5n, and the depth d 2 satisfying the following relationship: λ/8n≦d2≦λ/6n, the specific region being a prepit region provided with prepits on the recording track, and wherein λ is the wavelength of a reproducing beam to reproduce information from the optical recording medium and n is the refractive index of a substrate on which the grooves and recording track are formed.
Claim 86
Dependent Claim
138 words
An optical recording medium which comprises: a tracking groove and a recording track adjacent thereto, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the depth d 2 of a groove in the specific region being smaller than the depth d 1 of a groove in the another region, the depth d 1 satisfying the following relationship: λ/7n≦d.sub.1 ≦λ/5n, and the depth d 2 satisfying in the following relationship: λ/8n≦d.sub.2 ≦λ/6n, the specific region being a prepit region provided with prepits on the recording track, wherein λ is the wavelength of a reproducing beam reproducing information from the optical recording medium and n is the refractive index of a substrate on which the groves are formed.
Claim 87
Dependent Claim
138 words
An optical recording medium which comprises: a tracking groove and a recording track adjacent thereto, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the depth d 2 of a groove in the specific region being smaller than the depth d 1 of a groove in the another region, the depth d 1 satisfying the following relationship: λ/7n≦d.sub.1 ≦λ/5n, and the depth d 2 satisfying in the following relationship: λ/8n≦d.sub.2 ≦λ/6n, the specific region being a prepit region provided with prepits on the recording track, wherein λ is the wavelength of a reproducing beam reproducing information from the optical recording medium and n is the refractive index of a substrate on which the groves are formed.
Claim 88
Dependent Claim
100 words
A substrate for an optical recording medium, which comprises: a tracking groove and a recording track adjacent thereto, the depth d 2 of a groove in a specific region being smaller than the depth d 1 of a groove in another region, the depth d 1 satisfying the following relationship: λ/7n≦d.sub.1 ≦/5n, the depth d 2 satisfying the following relationship: λ/8n≦d.sub.2 ≦λ/6n, the specific region being a prepit region provided with prepits on the recording track, wherein λ is the wavelength of a reproducing beam reproducing information on the substrate and wherein n is the refractive index of the substrate.
Claim 89
Dependent Claim
100 words
A substrate for an optical recording medium, which comprises: a tracking groove and a recording track adjacent thereto, the depth d 2 of a groove in a specific region being smaller than the depth d 1 of a groove in another region, the depth d 1 satisfying the following relationship: λ/7n≦d.sub.1 ≦/5n, the depth d 2 satisfying the following relationship: λ/8n≦d.sub.2 ≦λ/6n, the specific region being a prepit region provided with prepits on the recording track, wherein λ is the wavelength of a reproducing beam reproducing information on the substrate and wherein n is the refractive index of the substrate.
Claim 90
Dependent Claim
63 words
A substrate for an optical recording medium, which comprises: a tracking groove and a recording track adjacent thereto, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 91
Dependent Claim
63 words
A substrate for an optical recording medium, which comprises: a tracking groove and a recording track adjacent thereto, the width l 3 of a tracking groove in a specific region and the width l 1 of a tracking groove in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 92
Dependent Claim
68 words
An optical recording medium comprising: a substrate and a recording layer, the substrate comprising a tracking track and a recording track adjacent thereto, the width l 3 of a tracking track in a specific region and the width l 1 of a tracking track in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 93
Dependent Claim
68 words
An optical recording medium comprising: a substrate and a recording layer, the substrate comprising a tracking track and a recording track adjacent thereto, the width l 3 of a tracking track in a specific region and the width l 1 of a tracking track in another region having the following relationship: 0.60≦l.sub.3 /l.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 94
Dependent Claim
66 words
An optical recording medium comprising: a substrate and a recording layer, the substrate comprising a tracking groove and a recording track adjacent thereto, the depth d 2 of a groove in a specific region and the depth d 1 of a groove in another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 95
Dependent Claim
66 words
An optical recording medium comprising: a substrate and a recording layer, the substrate comprising a tracking groove and a recording track adjacent thereto, the depth d 2 of a groove in a specific region and the depth d 1 of a groove in another region having the following relationship: 0.80≦d.sub.2 /d.sub.1 ≦0.95, the specific region being a prepit region provided with prepits on the recording track.
Claim 96
Dependent Claim
71 words
An optical recording medium which comprises: a tracking track and a recording track adjacent thereto, wherein the relationship between the width l 3 of the tracking tracks in a prepit region provided with prepits on the recording track and the width l 1 of the tracking tracks in another region is set so that offset quantities of a tracking error signal in the prepit region and another region are substantially equal.
Claim 97
Dependent Claim
71 words
An optical recording medium which comprises: a tracking track and a recording track adjacent thereto, wherein the relationship between the width l 3 of the tracking tracks in a prepit region provided with prepits on the recording track and the width l 1 of the tracking tracks in another region is set so that offset quantities of a tracking error signal in the prepit region and another region are substantially equal.
Claim 98
Dependent Claim
69 words
An optical recording medium which comprises: a tracking groove and a recording track adjacent thereto, wherein the relation between the depth d 2 of a groove in a prepit region provided with prepits on the recording track and the depth d 1 of a groove in another region is set so that offset quantities of a tracking error signal in the prepit region and another region are substantially equal.
Claim 99
Dependent Claim
69 words
An optical recording medium which comprises: a tracking groove and a recording track adjacent thereto, wherein the relation between the depth d 2 of a groove in a prepit region provided with prepits on the recording track and the depth d 1 of a groove in another region is set so that offset quantities of a tracking error signal in the prepit region and another region are substantially equal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-17 | 1998-10-17 | 1999-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-17 | 2002-10-17 | 2003-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-17 | 2006-10-17 | 2007-04-18 | $7700.00 | Window Closed / Lapsed |