Patent EP0245821A2 successfully refreshed from Google Patents.
EP0245821A2
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EP
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Data record formatting system and reading/writing system for optical recording medium
Assignee: CSK Corp
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Filing: 1987-05-11
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Granted: —
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Expires: 2007-05-11
Abstract
Abstract A data record formatting system for an optical recording medium in which the reading and/or writing is carried out along tracking lines, and a data reading/writing system for the optical recording medium of the type. The data record formatting system for the optical recording medium comprises tracking portions used as a reference for the reading and/or writing operation and data recording portions for storing data. The tracking portions and the data recording portions are arranged alternatingly along the same line in a data recording region of the optical recording medium. The data reading/writing system forthe optical recording medium comprises track-tracing detecting means for setting a light spot or spots on the optical recording medium to trace the tracking portions and reading/writing means for setting a light spot on the optical recording medium to read and/or write the data. The track-tracing detecting means and the reading/writing means are arranged so that the light spots set on the optical recording medium are disposed on and along the line in which the tracking portions and the data recording portions are alternatingly arranged.
Inventors
- 👤 Shigeru Izawa
- 👤 Takashi Hasemi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 07:56
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0901; G11B7/0903; G11B7/004; G11B7/0938; G11B7/24; G11B7/2407; G11B7/24085
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
67 words
A data record formatting system for an optical recording medium adapted to carry out data reading and/or writing along tracking lines, which system comprises tracking portions used as a reference for the reading and/or writing operation; data recording portions for storing data; said tracking portions and said data recording portions being arranged alternatingly along the same line in a data recording region of the optical recording medium.
Claim 2
Dependent Claim
67 words
A data record formatting system for an optical recording medium adapted to carry out data reading and/or writing along tracking lines, which system comprises tracking portions used as a reference for the reading and/or writing operation; data recording portions for storing data; said tracking portions and said data recording portions being arranged alternatingly along the same line in a data recording region of the optical recording medium.
Claim 3
Dependent Claim
23 words
A data record formatting system for an optical recording medium as claimed in claim 1, in which the tracking portions are arranged periodically.
Claim 4
Dependent Claim
25 words
A data record formatting system for an optical recording medium as claimed in claim 1, in which each of said tracking portions is formed square.
Claim 5
Dependent Claim
48 words
A data record formatting system for an optical recording medium as claimed in claim 2, in which each of said tracking portions is formed square and a length of one side of the tracking portion is 1/2 and a pitch between any two adjacent tracking portions is 1.
Claim 6
Dependent Claim
40 words
A data record formatting system for an optical recording medium as claimed in any one of claims 1 to 4, in which each of the data recording portions is capable of storing one optically changed state for recording the data.
Claim 7
Dependent Claim
42 words
A data record formatting system for an optical recording medium as claimed in any one of claims 1 to 4, in which each of the data recording portions is capable of storing a plurality of optically changed states for recording the data.
Claim 8
Dependent Claim
53 words
A data record formatting system for an optical recording medium as claimed in any one of claims 1 to 4, in which a plurality of lines each comprising the tracking portions and the data recording portions disposed alternatingly are arranged side by side in the data recording region of the optical recording medium.
Claim 9
Dependent Claim
136 words
A data reading/writing system for an optical recording medium having tracking portions used as a reference for the reading and/or writing operation and data recording portions for storing data; said tracking portions and said data recording portions being arranged alternatingly along the same line in a data recording region of the optical recording medium, which system comprises track-tracing detecting means for setting a light spot or spots on the optical recording medium to trace the tracking portions; reading/writing means for setting a light spot on the optical recording medium to read and/or write the data; the track-tracing detecting means and the reading/writing means being arranged so that the light spots set on the optical recording medium are disposed on and along the line in which the tracking portions and the data recording portions are alternatingly arranged.
Claim 10
Dependent Claim
136 words
A data reading/writing system for an optical recording medium having tracking portions used as a reference for the reading and/or writing operation and data recording portions for storing data; said tracking portions and said data recording portions being arranged alternatingly along the same line in a data recording region of the optical recording medium, which system comprises track-tracing detecting means for setting a light spot or spots on the optical recording medium to trace the tracking portions; reading/writing means for setting a light spot on the optical recording medium to read and/or write the data; the track-tracing detecting means and the reading/writing means being arranged so that the light spots set on the optical recording medium are disposed on and along the line in which the tracking portions and the data recording portions are alternatingly arranged.
Claim 11
Dependent Claim
52 words
A data recording/writing system for an optical recording medium as claimed in claim 8, in which said light spots are spaced with specific positional relationships therebetween so that the whole or part of any one of the light spots may be positioned on the tracking portions throughout the proceeding of the tracking.
Claim 12
Dependent Claim
53 words
A data recording/writing system for an optical recording medium as claimed in claim 8, in which three light spots in total are set on the optical recording medium, the outer two light spots being used mainly for the tracking and the central light spot being used mainly for the data reading and/or writing.
Claim 13
Dependent Claim
53 words
A data recording/writing system for an optical recording medium as claimed 9, in which in which three light spots in total are set on the optical recording medium, the outer two light spots being used mainly for the tracking and the central light spot being used mainly for the data reading and/or writing.
Claim 14
Dependent Claim
42 words
A data recording/writing system for an optical recording medium as claimed in claim 10, in which one of the two light spots used for the tracking is also used as a monitoring light spot for reading error check and/or writing error check.
Claim 15
Dependent Claim
42 words
A data recording/writing system for an optical recording medium as claimed in claim 11, in which one of the two light spots used for the tracking is also used as a monitoring light spot for reading error check and/or writing error check.
Claim 16
Dependent Claim
21 words
A data recording/writing system for an optical recording medium as claimed in claim 8, which is used only for the reading.
Claim 17
Dependent Claim
21 words
A data recording/writing system for an optical recording medium as claimed in claim 8, which is used only for the writing.
Claim 18
Dependent Claim
24 words
A data recording/writing system for an optical recording medium as claimed in claim 8, which is used both for the reading and the writing.
Claim 19
Dependent Claim
21 words
A data recording/writing system for an optical recording medium as claimed in claim 9, which is used only for the writing.
Claim 20
Dependent Claim
21 words
A data recording/writing system for an optical recording medium as claimed in claim 9, which is used only for the writing.
Claim 21
Dependent Claim
24 words
A data recording/writing system for an optical recording medium as claimed in claim 9, which is used both for the reading and the writing.
Claim 22
Dependent Claim
36 words
A data recording/writing system for an optical recording medium as claimed in any one of claims 8 to 19, in which a clock signal is obtained from optical information provided by one of the light spots.
References Cited (Backward Citations)
No citation records indexed.
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