Patent EP0111010A1 successfully refreshed from Google Patents.
EP0111010A1
Expired / Lapsed
EP
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Optical disc reproducer
Assignee: Sony Corp
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Filing: 1983-06-04
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Granted: —
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Expires: 2003-06-04
Abstract
Abstract An optical disc reproducer comprises a focus-retracting circuit consisting of a voltage generator (10), a focus driver (20), a focus-regulating means (21), an optical pickup (22), a focus discriminator (23), a switch (24), and a switching controller (25) for repeatedly retracting a focus to retract a focus-controlling system for the light incident onto a disc to a controlled state, and detection means or detecting any malfunction in the focus retraction, consisting of, for example, a counter (31) for counting the number of repetitions of the focus retractions, for identifying the fact that the disc is mounted improperly so that the light is incident on the non-information reading surface of the disc, on the basis of a signal output from the detection means.
Inventors
- 👤 Akira Shibaura Plant Sony Corporation Katsuyama
- 👤 Shuichi Shibaura Plant Sony Corporation Kimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:28
CPC Classifications
G; G11; G11B; G11B33/00; G11B33/10; G11B19/00; G11B19/02; G11B19/04; G11B19/12; G11B7/00; G11B7/08; G11B7/09; G11B7/0945
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
An optical disc player comprising a preliminary focus control circuit (10, 20, 21, 22, 23, 24, 25) for repeatedly effecting preliminary focus control to bring a focusing control circuit arrangement for a beam of light falling on a disc into a mode of focus control operation, and detecting means (31: 131) for detecting an abnormal operation in said preliminary focus control, wherein an instance in which said disc is loaded with said beam of light falling on a non-information-recorded surface thereof can be detected on the basis of an output signal from said detecting means (31: 131).
Claim 2
Dependent Claim
97 words
An optical disc player comprising a preliminary focus control circuit (10, 20, 21, 22, 23, 24, 25) for repeatedly effecting preliminary focus control to bring a focusing control circuit arrangement for a beam of light falling on a disc into a mode of focus control operation, and detecting means (31: 131) for detecting an abnormal operation in said preliminary focus control, wherein an instance in which said disc is loaded with said beam of light falling on a non-information-recorded surface thereof can be detected on the basis of an output signal from said detecting means (31: 131).
Claim 3
Dependent Claim
70 words
An optical disc player according to claim 1, wherein said detecting means (31: 131) for detecting the abnormal operation in the preliminary focus control comprises a counter (31) supplied with a signal variable in response to start of said preliminary focus control from said preliminary focus control circuit (10, 20, 21, 22, 23, 24, 25), said output signal being generatable when said counter (31) counts at least a predetermined number.
Claim 4
Dependent Claim
87 words
An optical disc player according to claim 1, wherein said detecting means (31: 131) for detecting the abnormal operation in the preliminary focus control comprises a timer (131) supplied with a signal variable in response to start of said preliminary focus control from said preliminary focus control circuit (10, 20, 21, 22, 23, 24, 25) for starting measuring a time interval from an instant at which the first variation in the signal occurs, said output signal being generatable when said timer (131) measures a predetermined time interval.
Claim 5
Dependent Claim
48 words
An optical disc player according to claim 1. further comprising disc detecting means (34) for detecting whether said disc is present or not, said preliminary focus control circuit (10, 20, 21, 22, 23, 24, 25) being de-energizable in response to an output from said disc detecting means (34).
Claim 6
Dependent Claim
55 words
An optical disc player according to claim 1 further comprising a warning circuit (33) for indicating that said disc is loaded with said beam of light falling on a non-information-recorded surface thereof in response to the output signal supplied from said detecting means (31: 131) for detecting the abnormal operation in the preliminary focus control.
Claim 7
Dependent Claim
47 words
An optical disc player according to claim 1 further comprising a disc loading mechanism (32) for unloading said disc off a disc table (26) in response to the output signal supplied from said detecting means (31: 131) for detecting the abnormal operation in the preliminary focus control.
References Cited (Backward Citations)
No citation records indexed.
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