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    Multiple data surface optical medium and storage system
    33.
    发明专利
    Multiple data surface optical medium and storage system 未知

    公开(公告)号：SG43196A1

    公开(公告)日：1997-10-17

    申请号：SG1996005293

    申请日：1994-06-27

    Applicant: IBM

    Inventor： IMAINO WAYNE ISAMI ,  ROSEN HAL JERVIS ,  RIBIN 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.

    Multiple data layer optical disk drive system with fixed aberration correction and optimum interlayer spacing
    36.
    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：CZ293793B6

    公开(公告)日：2004-08-18

    申请号：CZ273597

    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: The invented multiple data layer optical disk drive system has fixed aberration correction and uses a disk (12) with maximum interlayer spacing for reduced interlayer crosstalk. In one embodiment the multiple data layer disk (12)¿has a substrate with a thickness that is reduced by approximately one-half the thickness of the spacer layer (44) that separates the first and last data layers. The disk (12) is designed to operate with a lens (210) that has spherical aberration correction to compensate for the thickness of a conventional single data layer disk (12). 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 one 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, the 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.

    38.
    发明专利
    未知

    公开(公告)号：DE69719601D1

    公开(公告)日：2003-04-17

    申请号：DE69719601

    申请日：1997-05-22

    Applicant: IBM

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

    IPC: G11B7/00 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/09 ,  G11B7/24 ,  G11B7/243 ,  G11B7/257

    Abstract: A multiple recording layer rewriteable phase-change optical disk (12) and disk drive uses a reverse writing type of reversible phase-change material as the recording layer (53) nearest the incident laser light. The disk has a light-transmissive substrate (50) onto which the laser light is incident. The substrate supports at least two spatially-separated multilayer recording stacks (90, 92), each stack including an active recording layer (53, 64) of reversible or rewriteable phase-change material. The recording stack (90) located nearest the substrate (50) on which the laser light is incident includes a reverse writing type of reversible phase change material, i.e., a phase-change material with an amorphous starting phase that is recorded onto by laser heating that converts data regions to the crystalline phase. This first recording layer (50) has a dielectric layer (51) in contact with it that has a high index of refraction relative to the adjacent recording layer and that acts as an optical interference film to provide a constructive 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 is also nonabsorbing so that laser light can pass through it to focus on a recording layer (64) in a farther recording stack (92). This allows the farther recording layer to be written using reasonable laser power.

    39.
    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.

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