US5383176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical disk
Assignee: Sharp Corp
•
Filing: 1993-05-07
•
Granted: 1995-01-17
•
Expires: 2013-05-07
Abstract
Abstract An optical disk including concentric or spiral grooves, a first series of pits formed in the interrupted portions, and a second series of pits formed in portions of lands. Both of the first and second series of pits represent address information. The portions of the lands and the interrupted portions of the grooves are located in different radial directions. With this arrangement, even when the optical disk has a reduced track pitch, accurate address information is obtained, achieving a high-density recording optical disk.
Inventors
- 👤 Tetsuya Inui
- 👤 Akira Takahashi
- 👤 Kenji Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:36
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/1055; G11B11/10556; G11B11/10563; G11B11/10565; G11B7/00; G11B7/004; G11B7/0045; G11B7/007; G11B7/00718; G11B7/08; G11B7/09; G11B7/0938; G11B7/24; G11B7/2407; G11B7/24073; G11B7/24079; G11B7/26; G11B7/261; G11B11/10576; G11B11/10578; G11B11/10582; G11B7/00745; G11B7/24085
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
73 words
An optical disk comprising: concentric or spiral grooves, said grooves having an interrupted portion in each rotation, and a plurality of land portions formed between the grooves; a first series of pits recorded in an interrupted portion as address information; and a second series of pits recorded in a portion of land as address information, the portion of said land and the interrupted portion of said groove being located in different radial directions.
Claim 2
Dependent Claim
73 words
An optical disk comprising: concentric or spiral grooves, said grooves having an interrupted portion in each rotation, and a plurality of land portions formed between the grooves; a first series of pits recorded in an interrupted portion as address information; and a second series of pits recorded in a portion of land as address information, the portion of said land and the interrupted portion of said groove being located in different radial directions.
Claim 3
Dependent Claim
27 words
The optical disk according to claim 1, wherein a width of one of said land portions between said grooves is equal to a width of said groove.
Claim 4
Dependent Claim
34 words
The optical disk according to claim 1, wherein said second series of pits is formed in a portion of said land portion located at a position distal to the interrupted portion of said groove.
Claim 5
Dependent Claim
45 words
The optical disk according to claim 1, wherein the width of said groove becomes smaller proximate to the interrupted portion of said groove, and said second series of pits are formed in one or more land portions located between said grooves with a smaller width.
Claim 6
Dependent Claim
31 words
The optical disk according to claim 1, wherein said optical disk is a magneto-optical disk, and information is recorded and reproduced on/from tracks in the form of said grooves and lands.
Claim 7
Dependent Claim
133 words
An optical disk comprising: concentric or spiral grooves having interrupted portions and a plurality of land portions formed between the grooves; a first series of pits recorded as address information in said interrupted portion of said grooves; and a second series of pits recorded as address information in a portion of land, the portion of said land and the interrupted portion of said groove being located in different radial directions, wherein a width of each of said land portions between said grooves or a width of said groove is not less than 30 percent of a diameter of a light spot projected to reproduce said address information from said first and second series of pits but not greater than 45 percent of a sum of the widths of said land and said groove.
Claim 8
Dependent Claim
133 words
An optical disk comprising: concentric or spiral grooves having interrupted portions and a plurality of land portions formed between the grooves; a first series of pits recorded as address information in said interrupted portion of said grooves; and a second series of pits recorded as address information in a portion of land, the portion of said land and the interrupted portion of said groove being located in different radial directions, wherein a width of each of said land portions between said grooves or a width of said groove is not less than 30 percent of a diameter of a light spot projected to reproduce said address information from said first and second series of pits but not greater than 45 percent of a sum of the widths of said land and said groove.
Claim 9
Dependent Claim
129 words
An optical disk comprising: concentric or spiral grooves having interrupted portions; a magneto-optical recording medium layer, formed on a side of a substrate having said grooves, for enabling information to be recorded thereon by magnetic super resolution effects, a first series of pits recorded as address information on a line extending from the interrupted portions of said grooves; and a second series of pits recorded as address information in a portion of land located between said grooves, the portion of said land and the interrupted portion of said groove being located in different radial directions; wherein information is recorded on said magneto-optical recording medium layer on said grooves and lands with magnetic super resolution effects, and said address information is reproduced from said first and second series of pits.
Claim 10
Dependent Claim
129 words
An optical disk comprising: concentric or spiral grooves having interrupted portions; a magneto-optical recording medium layer, formed on a side of a substrate having said grooves, for enabling information to be recorded thereon by magnetic super resolution effects, a first series of pits recorded as address information on a line extending from the interrupted portions of said grooves; and a second series of pits recorded as address information in a portion of land located between said grooves, the portion of said land and the interrupted portion of said groove being located in different radial directions; wherein information is recorded on said magneto-optical recording medium layer on said grooves and lands with magnetic super resolution effects, and said address information is reproduced from said first and second series of pits.
Claim 11
Dependent Claim
24 words
The optical disk according to claim 4, wherein at said smaller width the grooves have a width of between about 0.4 and 0.6 μm.
Claim 12
Dependent Claim
24 words
The optical disk according to claim 4, wherein at said smaller width the grooves have a width of between about 0.4 and 0.5 μm.
Claim 13
Dependent Claim
24 words
The optical disk according to claim 4, wherein at said smaller width the grooves have a width of between about 0.3 and 0.4 μm.
Claim 14
Dependent Claim
25 words
The optical disk according to claim 1, wherein the first series of pits and the second series of pits are located in different radial directions.
Claim 15
Dependent Claim
25 words
The optical disk according to claim 6, wherein the first series of pits and the second series of pits are located in different radial directions.
Claim 16
Dependent Claim
25 words
The optical disk according to claim 7, wherein the first series of pits and the second series of pits are located in different radial directions.
Claim 17
Dependent Claim
72 words
An optical disk comprising: concentric or spiral grooves, said grooves having at least one interrupted portion, and a plurality of land portions formed between the grooves; a first series of pits recorded in an interrupted portion as address information; and a second series of pits recorded in a portion of land as address information, the portion of said land and the interrupted portion of said groove being located in different radial directions.
Claim 18
Dependent Claim
72 words
An optical disk comprising: concentric or spiral grooves, said grooves having at least one interrupted portion, and a plurality of land portions formed between the grooves; a first series of pits recorded in an interrupted portion as address information; and a second series of pits recorded in a portion of land as address information, the portion of said land and the interrupted portion of said groove being located in different radial directions.
Claim 19
Dependent Claim
45 words
The optical disk according to claim 14, wherein the width of said groove becomes smaller proximate to the interrupted portion of said groove, and said second series of pits are formed in one or more land portions located between said grooves with a smaller width.
Claim 20
Dependent Claim
24 words
The optical disk according to claim 15, wherein at said smaller width the grooves have a width of between about 0.4 and 0.6 μm.
Claim 21
Dependent Claim
24 words
The optical disk according to claim 15, wherein at said smaller width the grooves have a width of between about 0.4 and 0.5 μm.
Claim 22
Dependent Claim
24 words
The optical disk according to claim 15, wherein at said smaller width the grooves have a width of between about 0.3 and 0.4 μm.
Claim 23
Dependent Claim
31 words
The optical disk according to claim 14, wherein said optical disk is a magneto-optical disk, and information is recorded and reproduced on/from tracks in the form of said grooves and lands.
Claim 24
Dependent Claim
25 words
The optical disk according to claim 14, wherein the first series of pits and the second series of pits are located in different radial directions.
Claim 25
Dependent Claim
116 words
A magneto-optical disk comprising: discontinuously arranged concentric or spiral elongated grooves; an interrupted portion formed between grooves among said grooves, which are located next to each other in a circular direction; concentric or spiral land portions located at least adjacent to and in parallel with said grooves; a first series of pits recorded as address information in said interrupted portion; a second series of pits recorded as address information in said land portion, wherein said second series of pits is formed in a portion of said land portion located in a radial direction different from a radial direction in which the interrupted portions of one or more said grooves next to said land portion are located.
Claim 26
Dependent Claim
116 words
A magneto-optical disk comprising: discontinuously arranged concentric or spiral elongated grooves; an interrupted portion formed between grooves among said grooves, which are located next to each other in a circular direction; concentric or spiral land portions located at least adjacent to and in parallel with said grooves; a first series of pits recorded as address information in said interrupted portion; a second series of pits recorded as address information in said land portion, wherein said second series of pits is formed in a portion of said land portion located in a radial direction different from a radial direction in which the interrupted portions of one or more said grooves next to said land portion are located.
Claim 27
Dependent Claim
24 words
The disk according to claim 21, wherein the first series of pits and the second series of pits are located in different radial directions.
Claim 28
Dependent Claim
15 words
The optical disk according to claim 21, wherein said optical disk is a magneto-optical disk.
References Cited (Backward Citations)
JPS5823333A
Cited
US4535439A
Cited
US4985881A
Cited
JPS6161237A
Cited
EP0176755B1
Cited
JPS6163930A
Cited
EP0193614A1
Cited
US4985616A
Cited
US5214635A
Cited
US4947384A
Cited
JPH01307020A
Cited
JPH02156423A
Cited
EP0499278A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-16 | 1998-07-18 | 1999-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-16 | 2002-07-18 | 2003-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-16 | 2006-07-18 | 2007-01-17 | $7700.00 | Window Closed / Lapsed |