US4982392A
Expired / Lapsed
US
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Stabilized optical pick-up device inhibiting the effect of the focus error signal at the start and end of a data region
Assignee: Ricoh Co Ltd
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Filing: 1988-07-08
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Granted: 1991-01-01
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Expires: 2008-07-08
Abstract
Abstract An optical pick-up device for use in an optical information recording/reproducing apparatus carries out a focusing and tracking control operation to keep the optical pick-up device located in a desired location relative to an associated optical disc. In accordance with the present invention, the focusing or tracking control operation is temporarily inhibited for a predetermined time period immediately after the initiation of recording of data to the optical disc and immediately after the termination of recording of data to the optical disc if a focusing or tracking error signal has been detected to exceed a predetermined range.
Inventors
- 👤 Toshiyuki Soejima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:16
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0945
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
128 words
A method for controlling the operation of an optical pick-up device for recording data to and/or reproducing data form a selected region of a recording track formed on an optical recording medium by irradiating said medium with a light beam, comprising the steps of detecting whether or not a focusing error is outside a predetermined range and producing a detection signal related thereto and carrying out focusing of said light beam on said recording medium in accordance with said detection signal, and inhibiting said focusing if said detection signal indicates that the focusing error is outside the predetermined range when said detection signal is being output from said detecting means during predetermined time periods at the start and at the end of said selected region of the track.
Claim 2
Independent Claim
128 words
A method for controlling the operation of an optical pick-up device for recording data to and/or reproducing data form a selected region of a recording track formed on an optical recording medium by irradiating said medium with a light beam, comprising the steps of detecting whether or not a focusing error is outside a predetermined range and producing a detection signal related thereto and carrying out focusing of said light beam on said recording medium in accordance with said detection signal, and inhibiting said focusing if said detection signal indicates that the focusing error is outside the predetermined range when said detection signal is being output from said detecting means during predetermined time periods at the start and at the end of said selected region of the track.
Claim 3
Dependent Claim
35 words
The method of claim 1 wherein said optical recording medium is an optical disc which is rotatably supported and said recording track is a spiral track formed on a writing surface of said optical disc.
Claim 4
Dependent Claim
43 words
The method of claim 2 wherein said focusing is carried out by moving said optical pick-up device either closer to or further away from said optical disc in a direction perpendicular to a plane defined by said writing surface of said optical disc.
Claim 5
Independent Claim
145 words
A method for controlling the operation of an optical pick-up device for recording data to and/or reproducing data from selected regions of a recording track formed on an optical recording medium by irradiating said medium with a light beam, comprising deriving a tracking error signal and detecting whether or not a tracking error represented by said tracking error signal is outside a predetermined range and for generating a detection signal related thereto, carrying out a tracking control operation of said light beam relative to said optical recording medium and and inhibiting said tracking control operation if said detection signal indicates that the tracking error is outside the predetermined range when said detection signal is being output from said detecting means during a predetermined time period which starts at the start or the end of any one of said selected regions of said optical recording medium.
Claim 6
Independent Claim
145 words
A method for controlling the operation of an optical pick-up device for recording data to and/or reproducing data from selected regions of a recording track formed on an optical recording medium by irradiating said medium with a light beam, comprising deriving a tracking error signal and detecting whether or not a tracking error represented by said tracking error signal is outside a predetermined range and for generating a detection signal related thereto, carrying out a tracking control operation of said light beam relative to said optical recording medium and and inhibiting said tracking control operation if said detection signal indicates that the tracking error is outside the predetermined range when said detection signal is being output from said detecting means during a predetermined time period which starts at the start or the end of any one of said selected regions of said optical recording medium.
Claim 7
Dependent Claim
34 words
The method of claim 4 wherein said optical recording medium is an optical disc which is rotatably supported and said recording track is a spiral formed on a writing surface of said optical disc.
Claim 8
Dependent Claim
25 words
The method of claim 5 wherein said tracking control operation is carried out by moving said optical pick-up device radially relative to said optical disc.
Claim 9
Independent Claim
127 words
A method of controlling the operation of an optical pick-up device for writing data on and/or reading data from a recording medium by irradiating said medium with a beam of radiant energy which is focused on and follows a track on said medium, including detecting the degree of focus of the beam on the medium and in response generating a focus detection signal, writing data on the medium with said pick-up device for a selected writing period and controlling the focus of said beam on the medium on the basis of said focus detection signal during said selected writing period but inhibiting said controlling at the start and at the end of said selected writing period if said focus detection signal departs from a selected focus threshold.
Claim 10
Independent Claim
127 words
A method of controlling the operation of an optical pick-up device for writing data on and/or reading data from a recording medium by irradiating said medium with a beam of radiant energy which is focused on and follows a track on said medium, including detecting the degree of focus of the beam on the medium and in response generating a focus detection signal, writing data on the medium with said pick-up device for a selected writing period and controlling the focus of said beam on the medium on the basis of said focus detection signal during said selected writing period but inhibiting said controlling at the start and at the end of said selected writing period if said focus detection signal departs from a selected focus threshold.
Claim 11
Dependent Claim
72 words
A method as in claim 7 including detecting the tracking of said track with said beam and in response generating a tracking detection signal, and controlling the tracking of said track with said beam on the basis of said tracking detection signal but inhibiting said controlling of said tracking at the start and at the end of said selected writing period if said tracking error signal departs from a selected tracking threshold.
Claim 12
Dependent Claim
52 words
A method as in claim 8 in which the data written on the medium during said selected writing period are written in data regions each of which is preceded and succeeded by respective gaps and said inhibiting takes place when said beam irradiates at least a part of one of said gaps.
Claim 13
Dependent Claim
27 words
A method as in claim 9 in which said medium is an optical disc having a recording surface and a spiral recording track on said recording surface.
Claim 14
Independent Claim
127 words
A method of controlling the operation of an optical pick-up device for writing data on and/or reading data from a recording medium by irradiating said medium with a beam of radiant energy which follows a track on said medium, comprising detecting the tracking of said track with said beam and in response generating a tracking detection signal, writing data on the medium with said pick-up device for a selected writing period and controlling the tracking of said track with said beam on the basis of said tracking detection signal by inhibiting said controlling at the start and at the end of said selected writing period if said tracking detection signal departs from a selected tracking threshold at said start and said end of the selected waiting period.
Claim 15
Independent Claim
127 words
A method of controlling the operation of an optical pick-up device for writing data on and/or reading data from a recording medium by irradiating said medium with a beam of radiant energy which follows a track on said medium, comprising detecting the tracking of said track with said beam and in response generating a tracking detection signal, writing data on the medium with said pick-up device for a selected writing period and controlling the tracking of said track with said beam on the basis of said tracking detection signal by inhibiting said controlling at the start and at the end of said selected writing period if said tracking detection signal departs from a selected tracking threshold at said start and said end of the selected waiting period.
Claim 16
Dependent Claim
54 words
A method as in claim 11 in which the data written on the medium during said selected writing period are written at selected data regions preceded and succeeded by respective gaps of data on the medium and said inhibiting takes place when said beam irradiates at least a part of one of said gaps.
Claim 17
Dependent Claim
27 words
A method as in claim 12 in which said medium is an optical disc having a recording surface and a spiral recording track on said recording surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |