Patent EP0318593A1 successfully refreshed from Google Patents.
EP0318593A1
Expired / Lapsed
EP
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Device for reading optical recording medium and optical detector therefor
Assignee: CSK Corp
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Filing: 1988-06-13
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Granted: —
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Expires: 2008-06-13
Abstract
Abstract A device for reading an optical recording medium having a clock track, a data track and a guideline for tracking. The device comprises an optical detector for receiving optical images from the clock track, data track and guideline for tracking, a clock detector circuit which receives signals from the clock track and produces clock signals, a data detector circuit which converts the data read from the data track into binary signals according to the clock signals and produces them, a focus error detecting circuit which detects focus error depending upon signals from the guideline for tracking, and a tracking error detector circuit for detecting tracking error. The optical detector is constituted by frist to fourth optical detector elements which receive optical images from the guideline for tracking, a fifth optical detector element which receives optical images from the clock track, and a sixth optical detector element which receives optical images from the data track. With the optical detector being constructed in a compact form, the reading device is also constructed in a small size and in a reduced weight.
Inventors
- 👤 Kiyoshi Horie
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 23:25
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/002; G11B7/0037; G11B7/004; G11B7/005; G11B7/0938; G11B7/12; G11B7/13
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
166 words
A reading apparatus for an optical recording medium having a clock line, data tracks and a tracking guide line, which apparatus comprises: a photodetector which receives light images of the clock track, data tracks and tracking guide line; a clock detecting circuit which is responsive to a signal from the clock track generated by the photodetector to output a clock signal; data detecting circuit which encodes data read from the data tracks by the photodetector into a binary code in response to the clock signal; a focus error detecting circuit for detecting a focus error and a tracking error detecting circuit for detecting a tracking error in response to a signal from the tracking guide line by the photodetector; said photodetector being comprised of first to fourth light-sensitive elements which receive a light image of the tracking guide line, a fifth light-sensitive element which receives a light image of the clock track and a sixth light-sensitive element which receives a light image of the data track.
Claim 2
Dependent Claim
166 words
A reading apparatus for an optical recording medium having a clock line, data tracks and a tracking guide line, which apparatus comprises: a photodetector which receives light images of the clock track, data tracks and tracking guide line; a clock detecting circuit which is responsive to a signal from the clock track generated by the photodetector to output a clock signal; data detecting circuit which encodes data read from the data tracks by the photodetector into a binary code in response to the clock signal; a focus error detecting circuit for detecting a focus error and a tracking error detecting circuit for detecting a tracking error in response to a signal from the tracking guide line by the photodetector; said photodetector being comprised of first to fourth light-sensitive elements which receive a light image of the tracking guide line, a fifth light-sensitive element which receives a light image of the clock track and a sixth light-sensitive element which receives a light image of the data track.
Claim 3
Dependent Claim
62 words
A reading apparatus for an optical recording medium as claimed in claim 1, in which said first and said second light-sensitive element are arranged in a line and said third and said fourth light-sensitive element are arranged in a line parallel with said line of the first and the second light-sensitive element in alignment with the first and the second element, respectively.
Claim 4
Dependent Claim
34 words
A reading apparatus for an optical recording medium as claimed in claim 1, in which said fifth and said sixth light-sensitive element are arranged in rows in a direction perpendicular to the parallel lines.
Claim 5
Dependent Claim
57 words
A reading apparatus for an optical recording medium as claimed in claim 2, in which said clock track and said tracking guide line are provided on the same line on the optical recording medium and said sixth light-sensitive element of the photodetector is disposed at a position which is surrounded by said first to fourth light-sensitive elements.
Claim 6
Dependent Claim
32 words
A reading apparatus for an optical recording medium as claimed in any one of claims 1 to 4, in which said first to said sixth light-sensitive element are integrated on one substrate.
Claim 7
Dependent Claim
147 words
A photodetector for use in the reading of data from an optical recording medium having a clock track, data tracks and tracking guide line, which photodetector comprises: a first and a second light-sensitive element which are juxtaposed in a line; a third and a fourth light-sensitive element which are juxtaposed in a line which is parallel with said line of the first and said second light-sensitive element so as to correspond to said first and said second light-sensitive element, respectively; and a fifth and a sixth light-sensitive element which are disposed outside of the two parallel lines; said first to said fourth light-sensitive element being adapted to receive a light image of the tracking guide line, said fifth light-sensitive element being adapted to receive a light image of the data track and said sixth light-sensitive element being adapted to receive a light image of the clock track.
Claim 8
Dependent Claim
147 words
A photodetector for use in the reading of data from an optical recording medium having a clock track, data tracks and tracking guide line, which photodetector comprises: a first and a second light-sensitive element which are juxtaposed in a line; a third and a fourth light-sensitive element which are juxtaposed in a line which is parallel with said line of the first and said second light-sensitive element so as to correspond to said first and said second light-sensitive element, respectively; and a fifth and a sixth light-sensitive element which are disposed outside of the two parallel lines; said first to said fourth light-sensitive element being adapted to receive a light image of the tracking guide line, said fifth light-sensitive element being adapted to receive a light image of the data track and said sixth light-sensitive element being adapted to receive a light image of the clock track.
Claim 9
Dependent Claim
28 words
A photodetector as claimed in claim 6, in which a plurality of fifth light-sensitive elements are arranged in rows in a direction perpendicular to the two parallel lines.
Claim 10
Dependent Claim
23 words
A photodetector as claimed in claim 6 or 7, in which said first to said sixth light-sensitive element are integrated on one substrate.
Claim 11
Dependent Claim
31 words
A photodetector as claimed in claim 7 or 8, in which said sixth light-sensitive element is disposed at a position which is surrounded by the first to the fourth light-sensitive element.
References Cited (Backward Citations)
No citation records indexed.
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