Patent US5105409A successfully refreshed from Google Patents.
EP0246899A1
Expired / Lapsed
EP
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Optical information recording and reproducing apparatus
Assignee: Canon Inc
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Filing: 1987-05-21
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Granted: —
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Expires: 2007-05-21
Abstract
Abstract An optical information recording and reproducing apparatus for an optical information record medium (101) on which a plurality of tracks are arranged substantially in parallel, comprises a light source (107), a first optical system (108,119,109) for forming a small spot on the record medium by converging a light beam from the light source, a second optical system (109,113) for obtaining the light beam from the record medium, a detecting device (115,10,11,12) for receiving the light beam obtained by the second optical system to output a tracking signal, a vibrating device (15,111) for vibrating the spot relatively to the record medium in a direction intersecting the extension of the track, a control device (13,111) for effecting a tracking control with respect to the track, and a selecting device (17,16,14) for selectively actuating the vibrating device and the control device in accordance with the tracking signal from said detecting device.
Inventors
- 👤 Hiroto Kitai
- 👤 Satoshi Shikichi
- 👤 Hideki Hosoya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:34
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
An optical information recording and reproducing apparatus for an optical information record medium on which a plurality of tracks are arranged substantially in parallel, comprising: a light source; first optical means for forming a small spot on the record medium by conveying a light beam from said light source; second optical means for obtaining the light beam from the record medium; detecting means for receiving the light beam obtained by said second optical means to output a tracking signal; vibrating means for vibrating said spot relatively to the record medium in a direction intersecting the extension of the track; control means for effecting a tracking control with respect to the track; and selecting means for selectively actuating said vibrating means and said control means in accordance with the tracking signal from said detecting means.
Claim 2
Dependent Claim
134 words
An optical information recording and reproducing apparatus for an optical information record medium on which a plurality of tracks are arranged substantially in parallel, comprising: a light source; first optical means for forming a small spot on the record medium by conveying a light beam from said light source; second optical means for obtaining the light beam from the record medium; detecting means for receiving the light beam obtained by said second optical means to output a tracking signal; vibrating means for vibrating said spot relatively to the record medium in a direction intersecting the extension of the track; control means for effecting a tracking control with respect to the track; and selecting means for selectively actuating said vibrating means and said control means in accordance with the tracking signal from said detecting means.
Claim 3
Dependent Claim
23 words
An apparatus according to claim 1 wherein said vibrating means vibrates a objective lens of said first optical means to vibrate the spot.
Claim 4
Dependent Claim
18 words
An apparatus according to claim 1 wherein said vibrating means vibrates the record medium to vibrate the spot.
Claim 5
Dependent Claim
23 words
An apparatus according to claim 1 wherein said vibrating means vibrates a rotating mirror of said first optical means to vibrate the spot.
Claim 6
Dependent Claim
25 words
An apparatus according to claim 1 wherein said vibrating means vibrates the spot at such an amplitude as is about equal to a track pitch.
Claim 7
Independent Claim
144 words
A method for effecting a track pull-in in an optical information recording and reproducing apparatus for an optical information record medium on which a plurality of tracks are arranged substantially in parallel, said method comprising: a step of forming a small spot on the record medium by converging a light beam from a light source; a step of detecting whether the spot is in a control area of a tracking servo loop or out of the control area by receiving the light beam from the record medium; a step of vibrating the spot relatively to the record medium in a direction intersecting the extension of the track with the spot being taken off said loop when the spot is beyond a control area of said loop; and a step of actuating said loop when the spot comes into the control area of said loop.
Claim 8
Independent Claim
144 words
A method for effecting a track pull-in in an optical information recording and reproducing apparatus for an optical information record medium on which a plurality of tracks are arranged substantially in parallel, said method comprising: a step of forming a small spot on the record medium by converging a light beam from a light source; a step of detecting whether the spot is in a control area of a tracking servo loop or out of the control area by receiving the light beam from the record medium; a step of vibrating the spot relatively to the record medium in a direction intersecting the extension of the track with the spot being taken off said loop when the spot is beyond a control area of said loop; and a step of actuating said loop when the spot comes into the control area of said loop.
Claim 9
Independent Claim
67 words
A method of control in an apparatus for recording and/or reproducing optical information on/from a record medium having a plurality of tracks, in which movement of a light beam is controlled in a tracking servo loop when within a control area of the loop, and in which the servo loop control is disabled and the beam is otherwise moved when outside a control area of the loop.
Claim 10
Independent Claim
67 words
A method of control in an apparatus for recording and/or reproducing optical information on/from a record medium having a plurality of tracks, in which movement of a light beam is controlled in a tracking servo loop when within a control area of the loop, and in which the servo loop control is disabled and the beam is otherwise moved when outside a control area of the loop.
References Cited (Backward Citations)
EP0040995A2
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EP0056920A1
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EP0079109A1
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EP0089274A1
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EP0144058A2
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EP0166614A2
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