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    42.
    发明专利
    未知

    公开(公告)号：DE69426660T2

    公开(公告)日：2001-07-12

    申请号：DE69426660

    申请日：1994-06-27

    Applicant: IBM

    Inventor： IMAINO WAYNE ISAMI ,  ROSEN HAL JERVIS ,  RUBIN KURT ALLAN ,  STRAND TIMOTHY CARL

    IPC: G11B7/095 ,  G11B7/005 ,  G11B7/09 ,  G11B7/24 ,  G11B7/00

    Abstract: The optical data storage system comprises an optical medium comprising two spaced-apart substrates having the same material thickness, each substrate having a data layer. At least one of the substrates has a data layer which is at least partially transmissive. A light source is located near a first one of the substrates. A device directs light from the source to the medium, and includes a device for focusing the light to a discrete number of focusing positions. Each position defines an optical path between the light source and a corresponding one of the data layers. Each of the two optical paths includes a passage through substrate material having a total thickness equal to three substrate thicknesses.

    43.
    发明专利
    未知

    公开(公告)号：DE69511730T2

    公开(公告)日：2000-04-06

    申请号：DE69511730

    申请日：1995-12-07

    Applicant: IBM

    Inventor： KULAKOWSKI JOHN EDWARD ,  MCDOWELL JUDSON ALLEN ,  RUBIN KURT ALLAN

    IPC: G11B7/00 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/007 ,  G11B7/125 ,  G11B11/105 ,  G11B20/18 ,  G11B7/013 ,  G11B20/12

    Abstract: The present invention provides efficient management of calibration and spare sectors on a banded optical write-once, read-many (WORM) disk. A portion of each band on the disk includes a user data area and a reserved area. Sectors in the reserved area are usable either as spare sectors, replacing defective sectors in the user area, or as calibration sectors, for use when the laser write-power level is calibrated. Sectors preferably are used for sparing from one end of the reserved area while sectors are used for calibration from the opposite end. A common overflow reserved area can also be provided for use if all of the sectors in one or more primary reserved areas associated with any of the bands have been exhausted.

    45.
    发明专利
    未知

    公开(公告)号：DE69511730D1

    公开(公告)日：1999-09-30

    申请号：DE69511730

    申请日：1995-12-07

    Applicant: IBM

    Inventor： KULAKOWSKI JOHN EDWARD ,  MCDOWELL JUDSON ALLEN ,  RUBIN KURT ALLAN

    IPC: G11B7/00 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/007 ,  G11B7/125 ,  G11B11/105 ,  G11B20/18 ,  G11B7/013 ,  G11B20/12

    Abstract: The present invention provides efficient management of calibration and spare sectors on a banded optical write-once, read-many (WORM) disk. A portion of each band on the disk includes a user data area and a reserved area. Sectors in the reserved area are usable either as spare sectors, replacing defective sectors in the user area, or as calibration sectors, for use when the laser write-power level is calibrated. Sectors preferably are used for sparing from one end of the reserved area while sectors are used for calibration from the opposite end. A common overflow reserved area can also be provided for use if all of the sectors in one or more primary reserved areas associated with any of the bands have been exhausted.

    46.
    发明专利
    未知

    公开(公告)号：BR9609637A

    公开(公告)日：1999-02-17

    申请号：BR9609637

    申请日：1996-03-08

    Applicant: IBM

    Inventor： TANG WADE WAI-CHUNG ,  RUBIN KURT ALLAN ,  ROSEN HAL JERVIS ,  IMAINO WAYNE ISAMI

    IPC: G11B7/0045 ,  G11B7/243 ,  G11B7/257 ,  G11B7/24 ,  G11B7/09

    Abstract: An optical disk drive uses an optical disk with spatially separated multiple phase-change WORM recording layers. The optical disk has a light transmissive substrate onto which the laser light is incident. The substrate supports at least two spatially separated multi-film recording stacks, each stack including an active recording layer of phase-change WORM material. The disk is either an air-gap structure wherein each recording stack is supported on a separate substrate and the substrates are separated by an air-gap, or a solid structure wherein a solid light transmissive spacer layer separates the recording stacks. Each of the recording stacks located between the substrate on which the laser light is incident and the farthest recording stack includes an active phase-change recording layer and an optical interference film in contact with the recording layer. The recording layer is made sufficiently thin to have good light transmissivity, but at this low thickness, without any other layers, is not sufficiently reflective to act as a recording layer with suitable servo and recording performance. The optical interference film in contact with the recording layer has a high index of refraction relative to the adjacent recording layer and spacer to increase the optical interference effect in the recording stack. The optical interference film optimizes the contrast, reflectivity and transmissivity of the recording stack. The optical interference film has low absorption so that laser light can pass through it to focus on a farther recording layer. This allows the farther recording layers to be written using reasonable laser power.

    MULTIPLE DATA LAYER OPTICAL DISK DRIVE SYSTEM WITH FIXED ABERRATION CORRECTION AND OPTIMUM INTERLAYER SPACING
    47.
    发明专利
    MULTIPLE DATA LAYER OPTICAL DISK DRIVE SYSTEM WITH FIXED ABERRATION CORRECTION AND OPTIMUM INTERLAYER SPACING 未知

    公开(公告)号：HU9801981A2

    公开(公告)日：1998-12-28

    申请号：HU9801981

    申请日：1996-02-01

    Applicant: IBM

    Inventor： LATTA MILTON RUSSELL ,  ROSEN HAL JERVIS ,  RUBIN KURT ALLAN ,  TANG WADE WAI-CHUNG

    IPC: G11B7/1378 ,  G11B7/00 ,  G11B7/005 ,  G11B7/24 ,  G11B7/252 ,  G11B7/135

    Abstract: A multiple data layer optical disk drive system has fixed aberration correction and uses a disk with maximum interlayer spacing for reduced interlayer crosstalk. In one embodiment the multiple data layer disk has a substrate with a thickness that is reduced by approximately one-half the thickness of the spacer layer that separates the first and last data layers. The disk is designed to operate with a lens that has spherical aberration correction to compensate for the thickness of a conventional single data layer disk. This allows the disk drive to handle multiple data layer disks as well as to be backward compatible and thus handle conventional single data layer disks. The thickness of the substrate material plus one-half the thickness of the spacer layer material (which may have a different index of refraction than the substrate material) is equivalent, for purposes of spherical aberration correction, to the thickness of the substrate material used in the conventional single data layer disk. The focused spot with minimum spherical aberration is thus located at the middle of the spacer layer rather than on the first data layer. The spacer layer thickness is selected so that when the focused spot is located on either the first or last data layer there is some deliberately designed spherical aberration, although an amount that is acceptable. As a result the thickness of the spacer layer can be significantly increased to thereby reduce interlayer crosstalk. In another embodiment that substrate thickness and spacer layer thickness are selected and then the lens is corrected for spherical aberration corresponding to the thickness of substrate material plus one-half the thickness of spacer layer material.

    DISK DRIVE FOR AN OPTICAL DISK WITH MULTIPLE LAYERS OF DATA, PREDETERMINED ABERRATION CORRECTION AND OPTIMUM INTERLAYER DISTANCE
    49.
    发明专利
    DISK DRIVE FOR AN OPTICAL DISK WITH MULTIPLE LAYERS OF DATA, PREDETERMINED ABERRATION CORRECTION AND OPTIMUM INTERLAYER DISTANCE 未知

    公开(公告)号：PL322062A1

    公开(公告)日：1998-01-05

    申请号：PL32206296

    申请日：1996-02-01

    Applicant: IBM

    Inventor： LATTA MILTON RUSSELL ,  ROSEN HAL JERVIS ,  RUBIN KURT ALLAN ,  TANG WADE WAI-CHUNG

    IPC: G11B7/00 ,  G11B7/1378 ,  G11B7/005 ,  G11B7/24 ,  G11B7/252 ,  G11B7/135

    Abstract: A multiple data layer optical disk drive system has fixed aberration correction and uses a disk with maximum interlayer spacing for reduced interlayer crosstalk. In one embodiment the multiple data layer disk has a substrate with a thickness that is reduced by approximately one-half the thickness of the spacer layer that separates the first and last data layers. The disk is designed to operate with a lens that has spherical aberration correction to compensate for the thickness of a conventional single data layer disk. This allows the disk drive to handle multiple data layer disks as well as to be backward compatible and thus handle conventional single data layer disks. The thickness of the substrate material plus one-half the thickness of the spacer layer material (which may have a different index of refraction than the substrate material) is equivalent, for purposes of spherical aberration correction, to the thickness of the substrate material used in the conventional single data layer disk. The focused spot with minimum spherical aberration is thus located at the middle of the spacer layer rather than on the first data layer. The spacer layer thickness is selected so that when the focused spot is located on either the first or last data layer there is some deliberately designed spherical aberration, although an amount that is acceptable. As a result the thickness of the spacer layer can be significantly increased to thereby reduce interlayer crosstalk. In another embodiment that substrate thickness and spacer layer thickness are selected and then the lens is corrected for spherical aberration corresponding to the thickness of substrate material plus one-half the thickness of spacer layer material.

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