US5258970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical disc and optical disc reproducing apparatus
Assignee: Sony Corp
•
Filing: 1992-04-01
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Granted: 1993-11-02
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Expires: 2012-04-01
Abstract
Abstract A plurality of tracks comprising pits each having a diameter smaller than a beam spot diameter of a laser beam are arranged on an optical disc. By irradiating the laser beam onto the optical disc, a plurality of pits are reproduced a lump. The reflected lights from a plurality of pits on the optical disc are supplied to a plural-divided photodetector. Outputs of the plural-divided photodetector are supplied to a matrix circuit and multidimensional vectors are formed. The data recorded on the optical disc is decoded from the multidimensional vectors. A tracking area and a clock area are provided on the optical disc. A tracking control is performed by using a reproduction signal of the tracking area. The clocks are reproduced by using a reproduction signal of the clock area.
Inventors
- 👤 Seiji Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:49
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B7/00; G11B7/007; G11B7/00745; G11B7/013; G11B7/12; G11B7/14
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
52 words
An optical disc having tracks comprising a plurality of pit trains having a number of pits, each of said pits having a diamter smaller than a beam spot diamter of a laser beam; wherein said pit trains are arranged in a pit pattern such that multidimensional vectors representing detected signals are created.
Claim 2
Dependent Claim
52 words
An optical disc having tracks comprising a plurality of pit trains having a number of pits, each of said pits having a diamter smaller than a beam spot diamter of a laser beam; wherein said pit trains are arranged in a pit pattern such that multidimensional vectors representing detected signals are created.
Claim 3
Dependent Claim
33 words
An optical disc according to claim 1 further comprising a first area between said plurality of pit trains for tracking and a second area consisting of a plurality of pits for decoded timing.
Claim 4
Dependent Claim
52 words
An optical disc having tracks comprising at least two pit trains having a number of pits, each of said pits having a diameter smaller than a beam spot diameter of a laser beam; wherein said pit trains are arranged in a pit pattern such that three-dimensional vectors representing detected signals are created.
Claim 5
Dependent Claim
52 words
An optical disc having tracks comprising at least two pit trains having a number of pits, each of said pits having a diameter smaller than a beam spot diameter of a laser beam; wherein said pit trains are arranged in a pit pattern such that three-dimensional vectors representing detected signals are created.
Claim 6
Dependent Claim
32 words
An optical disc according to claim 3 further comprising a first area between said plurality of pit trains for tracking and a second area consisting of a plurality pits for decoded timing.
Claim 7
Dependent Claim
67 words
An optical disc reproducing apparatus comprising: means for irradiating a laser beam onto an optical disc on which pits each having a diameter smaller than a beam spot diameter of a laser beam are arranged; means for forming multidimensional signals from reflected lights of the laser beam; and means for decoding recording data on the optical disc from multidimensional vectors which are obtained from the multidimensional signals.
Claim 8
Dependent Claim
67 words
An optical disc reproducing apparatus comprising: means for irradiating a laser beam onto an optical disc on which pits each having a diameter smaller than a beam spot diameter of a laser beam are arranged; means for forming multidimensional signals from reflected lights of the laser beam; and means for decoding recording data on the optical disc from multidimensional vectors which are obtained from the multidimensional signals.
Claim 9
Dependent Claim
39 words
An apparatus according to claim 5, wherein the means for forming the multidimensional signals comprises photodetecting means for divisionally detecting the reflected lights of the laser beam and arithmetic operating means for matrix operating outputs of said photodetecting means.
Claim 10
Dependent Claim
80 words
An apparatus according to claim 5, wherein said decoding means is a table in which the multidimensional vectors and the data are made correspond, multidimensional vectors which are away from each other by enough distances are selected as said multidimensional vectors corresponding to the data, and in the case where the inputted multidimensional vectors are other than the selected multidimensional vectors, the data corresponding to one of the selected multidimensional vectors which is close to said multidimensional vectors is generated.
Claim 11
Dependent Claim
67 words
An optical disc reproducing apparatus comprising: means for irradiating a laser beam onto an optical disc on which pits each having a diameter smaller than a beam spot diameter of a laser beam are arranged; means for forming multidimensional signals from reflected lights of the laser beam; and means for decoding recording data on the optical disc from three-dimensional vectors which are obtained from the multidimensional signals.
Claim 12
Dependent Claim
67 words
An optical disc reproducing apparatus comprising: means for irradiating a laser beam onto an optical disc on which pits each having a diameter smaller than a beam spot diameter of a laser beam are arranged; means for forming multidimensional signals from reflected lights of the laser beam; and means for decoding recording data on the optical disc from three-dimensional vectors which are obtained from the multidimensional signals.
Claim 13
Dependent Claim
68 words
An apparatus according to claim 8, wherein the means for forming the three-dimensional signals comprises 4-divided photodetecting means for dividing the reflected lights of the laser beam into four portions and matrix operating means for matrix operating outputs of said photodetecting means and forming three-dimensional signals of a primary diffracted light in the radial direction a primary diffracted light in the tangential direction, and a 0th-order diffracted light.
Claim 14
Dependent Claim
75 words
An apparatus according to claim 8, wherein said decoding means is a table in which three-dimensional vectors and data are made correspond, three-dimensional vectors which are away from each other by enough distances are selected as said three-dimensional vectors corresponding to the data, and when the inputted three-dimensional vectors are other than said selected three-dimensional vectors, the data corresponding to one of the selected three-dimensional vectors which is close to said three-dimensional vectors is generated.
Claim 15
Dependent Claim
109 words
An optical disc reproducing apparatus comprising: means for irradiating a laser beam onto an optical disc on which pits each having a diameter smaller than a beam spot diameter of a laser beam are arranged; means for forming multidimensional signals from reflected lights of the laser beam; means for decoding recording data on the optical disc from multidirectional vectors which are obtained from said multidimensional signals; means for executing a tracking control by using a signal which is reproduced from a predetermined area on the optical disc; and means for setting a decoding timing by using the signal which is reproduced from the predetermined area on the optical disc.
Claim 16
Dependent Claim
109 words
An optical disc reproducing apparatus comprising: means for irradiating a laser beam onto an optical disc on which pits each having a diameter smaller than a beam spot diameter of a laser beam are arranged; means for forming multidimensional signals from reflected lights of the laser beam; means for decoding recording data on the optical disc from multidirectional vectors which are obtained from said multidimensional signals; means for executing a tracking control by using a signal which is reproduced from a predetermined area on the optical disc; and means for setting a decoding timing by using the signal which is reproduced from the predetermined area on the optical disc.
Claim 17
Dependent Claim
38 words
An apparatus according to claim 11, wherein the means for forming the multidimensional signals comprises photodetecting means for dividing the reflected lights of the laser beam and arithmetic operating means for matrix operating outputs of the photodetecting means.
Claim 18
Dependent Claim
76 words
An apparatus according to claim 11, wherein the decoding means is a table in which the multidimensional vectors and the data are made correspond, multidimensional vectors which are away from each other by enough distances are selected as said multidimensional vectors corresponding to the data, and when inputted multidimensional vectors are other than said selected multidimensional vectors, the data corresponding to one of the selected multidimensional vectors which is close to said multidimensional vectors is generated.
Claim 19
Dependent Claim
109 words
An optical disc reproducing apparatus comprising: means for irradiating a laser beam onto an optical disc on which pits each having a diameter smaller than a beam spot diameter of a laser beam are arranged; means for forming three-dimensional signals from reflected lights of the laser beam; means for decoding recording data on the optical disc from three-dimensional vectors which are obtained from said three-dimensional signals; means for executing a tracking control by using a signal which is reproduced from a predetermined area on the optical disc; and means for setting a decoding timing by using the signal which is reproduced from the predetermined area on the optical disc.
Claim 20
Dependent Claim
109 words
An optical disc reproducing apparatus comprising: means for irradiating a laser beam onto an optical disc on which pits each having a diameter smaller than a beam spot diameter of a laser beam are arranged; means for forming three-dimensional signals from reflected lights of the laser beam; means for decoding recording data on the optical disc from three-dimensional vectors which are obtained from said three-dimensional signals; means for executing a tracking control by using a signal which is reproduced from a predetermined area on the optical disc; and means for setting a decoding timing by using the signal which is reproduced from the predetermined area on the optical disc.
Claim 21
Dependent Claim
70 words
An apparatus according to claim 14, wherein the means for forming the three-dimensional signals comprises 4-divided photodetecting means for dividing the reflected lights of the laser beam into four portions and matrix arithmetic operating means for matrix operating outputs of said photodetecting means and forming the three-dimensional signals of a primary diffracted light in the radial direction a primary diffracted light in the tangential direction, and a 0th-order diffracted light.
Claim 22
Dependent Claim
76 words
An apparatus according to claim 14, wherein the decoding means is a table in which the three-dimensional vectors and the data are made correspond, three-dimensional vectors which are away from each other by enough distances are selected as said three-dimensional vectors corresponding to the data, and when inputted three-dimensional vectors are other than the selected three-dimensional vectors, the data corresponding to one of the selected three-dimensional vectors which is close to said three-dimensional vectors is generated.
References Cited (Backward Citations)
JPH01184726A
Cited
US5140577A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-11-01 | 1997-05-03 | 1997-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-01 | 2001-05-03 | 2001-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-01 | 2005-05-03 | 2005-11-02 | $7700.00 | Window Closed / Lapsed |