EP0580876A1
Expired / Lapsed
EP
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Optical recording medium, its recording method, its reproducing method, and method for generating tracking error signal
Assignee: Sony Corp
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Filing: 1993-02-19
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Granted: —
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Expires: 2013-02-19
Abstract
Abstract A recording medium on which information data is optically recorded. In the recording region of the optical recording medium, the space between the n-th recording track and the preceding (n-1)-th recording track is smaller than the diameter of the spot of the projected light beam. On the n-th recording track, recorded is the data obtained by performing logical operation of the data recorded on the (n-1)-th recording track and the data to be recorded. Thereby, the capacity of storing information is in-creased. The information recorded on the optical recording medium is reproduced by the detector having first and second light receiving parts which are separated by a boundary line parallel to the recording tracks of the optical recording medium. The reflected light of the light beam projected over the adjacent two recording tracks are received by the detector. According to the level of the signal which is the sum of or the difference between the signals outputted from the first and second light receiving parts, the information recorded on the optical recording medium is read and reproduced.
Inventors
- 👤 Hideyoshi Horimai
- 👤 Goro Fujita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 22:47
CPC Classifications
H; H03; H03M; H03M5/00; H03M5/02; H03M5/04; H03M5/14; G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B7/00; G11B7/004; G11B7/0045; G11B7/005; G11B7/08; G11B7/09; G11B7/0901; G11B7/0938; G11B7/12; G11B7/14; G11B7/24; G11B7/26; G11B7/261; G11B7/007; G11B7/00745; G11B7/0943
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
78 words
A recording apparatus for an optical recording medium comprising: storage means for storing recording data recorded on a preceding recording track of the optical recording medium ; logical processing means for performing logical processing of input data recorded on a recording track succeeding said preceding recording track on said recording medium and recording data stored in said storage means; and recording means for recording the recording data outputted from said logical processing means on said succeeding recording track.
Claim 2
Dependent Claim
84 words
A reproducing apparatus for an optical recording medium comprising: an optical head; said optical head having a light source, an objective lens for converging a light beam radiated from said light source over two neighboring recording tracks on the optical recording medium, and light receiving means for receiving a return light beam incident thereon from said optical recording medium via said objective lens, and a discriminating circuit for discriminating recorded data based on a signal level of output signals from said light receiving means.
Claim 3
Dependent Claim
51 words
A reproducing apparatus according to claim 2, wherein said apparatus further comprises clock extracting means for extracting clock signal components from said output signals of said light receiving means, and control means for controlling the operation of said discriminating means based on said clock signals produced by said clock extracting means.
Claim 4
Dependent Claim
59 words
A reproducing apparatus according to claim 2 wherein said light receiving means has at least two light receiving areas having a boundary line parallel to said recording tracks and wherein said discriminating means is supplied with output signals of said two light receiving sections and compares the levels of the output signals supplied thereto for discriminating the recorded data.
Claim 5
Dependent Claim
55 words
A reproducing apparatus according to claim 2 wherein said light receiving means has at least two light receiving sections having a boundary line parallel to said recording tracks and wherein said discriminating means discriminates the recorded data based on the signal level corresponding to the difference of output signals of said two light receiving sections.
Claim 6
Dependent Claim
68 words
A reproducing apparatus according to claim 5 wherein said discriminating means is also supplied with a sum signal of the output signals of said two light receiving sections, with the recorded data being read based on the level of a signal corresponding to a difference between the level of said sum signal and the level of a difference between the output signals of said two light receiving sections.
Claim 7
Dependent Claim
69 words
An optical recording medium wherein an n-th recording track is located at a distance from an (n-1)th recording track preceding said n-th recording track in a recording region which is narrower than the diameter of a spot of a light beam radiated on the recording area, with recording data obtained on logical processing with recording data recorded on the (n-1)th recording track being recorded on the n-th recording track.
Claim 8
Dependent Claim
23 words
An optical recording medium acccording to claim 7, wherein initial data are recorded on an inner most recording track in said recording region.
Claim 9
Dependent Claim
103 words
A reproducing apparatus for an optical recording medium comprising: a detector having first and second light receiving areas having a boundary line extending parallel to a recording track of the optical recording medium; a first equalizer circuit supplied with an output signal from said first light receiving section; a second equalizer circuit supplied with an output signal from said second light receiving section; an addition circuit for summing an output of said first equalizer and an output of said second equalizer; and a subtraction circuit for taking a difference between the output of said first equalizer and the output of said second equalizer.
Claim 10
Dependent Claim
56 words
A reproducing apparatus according to claim 9, wherein said apparatus further comprises first adjustment means for adjusting a gain of said addition circuit and second adjustment means for adjusting the supply ratio of the output of said first equalizer supplied to said subtraction circuit and the output of said second equalizer supplied to said subtraction circuit.
Claim 11
Independent Claim
151 words
A method for reproducing an optical recording medium wherein an n-th recording track is located at a distance from an (n-1)th recording track preceding said n-th recording track in a recording region which is narrower than the diameter of a spot of a light beam radiated on the recording area, with recording data obtained by logical processing with recording data recorded on the (n-1)th recording track being recorded on the n-th recording track, comprising receiving, with a detector having first and second light receiving sections having a boundary line extending parallel to a recording track of the optical recording medium, a return beam of a light beam radiated across two adjacent recording tracks on said optical recording medium, and reading the information recorded on said optical recording medium based on the level of a sum signal of output signals of said first light receiving section and said second light receiving section.
Claim 12
Independent Claim
151 words
A method for reproducing an optical recording medium wherein an n-th recording track is located at a distance from an (n-1)th recording track preceding said n-th recording track in a recording region which is narrower than the diameter of a spot of a light beam radiated on the recording area, with recording data obtained on logical processing with recording data recorded on the (n-1)th recording track being recorded on the n-th recording track, comprising receiving, with a detector having first and second light receiving sections having a boundary line extending parallel to a recording track of the optical recording medium, a return beam of a light beam radiated across two adjacent recording tracks on said optical recording medium, and reading the information recorded on said optical recording medium based on the level of a differential signal between output signals of said first light receiving section and said second light receiving section.
Claim 13
Dependent Claim
65 words
A reproducing method for an optical recording medium according to claim 12, wherein said method further comprises reading the information recorded on the optical recording medium based on the signal level of a differential signal between output signals of said first and second light receiving sections and the signal level of a sum signal of output signals of said first and second light receiving sections.
Claim 14
Independent Claim
50 words
A method for recording an optical recording medium comprising recording , on a succeeding recording track of the recording medium the results of logical processing between recording data recorded on a preceding recording track and input data recorded on said succeeding track, said succeeding track directly succeeding said preceding track.
Claim 15
Independent Claim
155 words
A method for reproducing an optical recording medium wherein an n-th recording track is located at a distance from an (n-1)th recording track preceding said n-th recording track in a recording region which is narrower than the diameter of a spot of a light beam radiated on the recording area, with recording data obtained on logical processing with recording data recorded on the (n-1)th recording track being recorded on the n-th recording track, comprising deciding whether data recorded on the (n-1)th recording track has been read correctly based on comparison between replay data of the (n-1)th recording track produced on scanning an (n-2)th recording track and the (n-1)th recording track on said recording region with a light beam and replay data of the (n-1)th recording track produced on scanning the (n-1)th recording track and the n-th recording track on said recording region with a light beam, said n-th recording region succeeding said (n-1)th recording track.
Claim 16
Dependent Claim
82 words
An optical recording medium having first and second pits on an (n-1)th recording track in a recording region and a third pit on an n-th recording track succeeding said (n-1)th recording track, said n-th recording track being formed at a distance from said (n-1)th recording track narrower than the diameter of a spot of a light beam radiated on said (n-1)th track, said third pit being used for detecting the tracking error in cooperation with one of said first and second pits.
Claim 17
Dependent Claim
34 words
An optical recording medium according to claim 16, wherein one of said first and second pits is offset from the scanning center of the spot of the light beam by one-half track pit offset.
Claim 18
Independent Claim
154 words
A method for generating a tracking error from an optical recording medium having first and second pits on an (n-1)th recording track in a recording region and a third pit on an n-th recording track succeeding said (n-1)th recording track, said an n-th recording track being formed at a distance from said (n-1)th recording track narrower than the diameter of a spot of a light beam radiated on said (n-1)th track, said third pit being used for detecting the tracking error in cooperation with one of said first and second pits, comprising sample-holding a detection signal, obtained on scanning said first, second and third pits with said light beam, at timings of scanning said first, second and third pits with said light beam, taking differences between sample-held detection signals for generating plural differential signals and detecting the signs of said differential signals for periodically switching said differential signals for generating the tracking error signal.
Claim 19
Independent Claim
192 words
An apparatus for generating a tracking error from an optical recording medium having first and second pits on an (n-1)th recording track in a recording region and a third pit on an n-th recording track succeeding said (n-1)th recording track, said n-th recording track being formed at a distance from said (n-1)th recording track narrower than the diameter of a spot of a light beam radiated on said (n-1)th track, said third pit being used for detecting the tracking error in cooperation with one of said first and second pits, comprising timing signal generating means for generating timing signals based on clock signal components in output signals of an optical head, sample-and-hold means for sample-holding an output signal of said optical head detecting each of said first, second and third pits based on timing signals from said timing signal generating means, and tracking error generating means for generating plural differential signals by taking differences of output signals from sad sample-and-hold means associated with said pits and periodically switching said differential signals based on the signs of said plural differential signals for outputting resulting a periodically switched signal as the tracking error signal.
Claim 20
Dependent Claim
67 words
An apparatus for generating a tracking error according to claim 19, wherein said apparatus further comprises processing means for taking differences of output signals of said sample-and-hold means associated with said pits, discriminating means for discriminating the sign of an output signal from said processing means, and switching means for periodically switching output signals of said processing means based on an output signal of said discriminating means.
References Cited (Backward Citations)
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