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    DRIVING SYSTEM OF OPTICAL DISK WITH A GREAT AMOUNT OF DATA LAYERS, WITH CORRECTION OF FIXED ABERATION AND OPTIMIZED DISTRIBUTION OF INTERMEDIATE LAYERS
    21.
    发明专利
    DRIVING SYSTEM OF OPTICAL DISK WITH A GREAT AMOUNT OF DATA LAYERS, WITH CORRECTION OF FIXED ABERATION AND OPTIMIZED DISTRIBUTION OF INTERMEDIATE LAYERS 未知

    公开(公告)号：CZ9702735A3

    公开(公告)日：1997-12-17

    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

    CPC classification number: G11B7/24 ,  G11B7/005 ,  G11B2007/0013

    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.

    OPTICAL DATA STORAGE SYSTEM WITH MULTIPLE WRITE-ONCE PHASE-CHANGE RECORDING LAYERS
    22.
    发明专利
    OPTICAL DATA STORAGE SYSTEM WITH MULTIPLE WRITE-ONCE PHASE-CHANGE RECORDING LAYERS 未知

    公开(公告)号：CA2220879A1

    公开(公告)日：1997-01-23

    申请号：CA2220879

    申请日：1996-03-08

    Applicant: IBM

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

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

    Abstract: An optical disk drive (10) uses an optical disk (12) with spatially separate d multiple phase-change WORM recording layers (51, 66). 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 (90, 92), each stack including an active recording layer of phase- change WORM material. The disk is either an air-gap (78) structure wherein each recording stack is supported on a separate substrate (50, 56) and the substrates (50, 56) are separated by an air-gap (78), or a solid structure wherein a solid light transmissive spacer layer (22) separates the recording stacks (90, 92). Each of the recording stacks (90, 92) located between the substrate (50) on which the laser light is incident and the farthest recordi ng stack includes an active phase-change recording layer (51) and an optical interference film (53) in contact with the recording layer (51). The recordi ng layer (51) 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. T he optical interference film (53) in contact with the recording layer (51) has a high index ofrefraction relative to the adjacent recording layer (51) and spacer (122) to increase the optical interference effect in the recording stack (90). The optical interference film (53) optimizes the contrast, reflectivity and transmissivitzy of the recording stack. The optical interference film (53) has low absoprtion so that laser light can pass throu gh it to focus on a farther recording layer (66). This allows the farther recording layers (66) to be written using reasonable laser power.

    OPTICAL DATA STORAGE SYSTEM WITH MULTIPLE WRITE-ONCE PHASE-CHANGE RECORDING LAYERS
    26.
    发明专利
    OPTICAL DATA STORAGE SYSTEM WITH MULTIPLE WRITE-ONCE PHASE-CHANGE RECORDING LAYERS 未知

    公开(公告)号：CA2220879C

    公开(公告)日：2002-04-02

    申请号：CA2220879

    申请日：1996-03-08

    Applicant: IBM

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

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

    Abstract: An optical disk drive (10) uses an optical disk (12) with spatially separate d multiple phase-change WORM recording layers (51, 66). 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 (90, 92), each stack including an active recording layer of phase- change WORM material. The disk is either an air-gap (78) structure wherein each recording stack is supported on a separate substrate (50, 56) and the substrates (50, 56) are separated by an air-gap (78), or a solid structure wherein a solid light transmissive spacer layer (22) separates the recording stacks (90, 92). Each of the recording stacks (90, 92) located between the substrate (50) on which the laser light is incident and the farthest recordi ng stack includes an active phase-change recording layer (51) and an optical interference film (53) in contact with the recording layer (51). The recordi ng layer (51) 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. T he optical interference film (53) in contact with the recording layer (51) has a high index ofrefraction relative to the adjacent recording layer (51) and spacer (122) to increase the optical interference effect in the recording stack (90). The optical interference film (53) optimizes the contrast, reflectivity and transmissivitzy of the recording stack. The optical interference film (53) has low absoprtion so that laser light can pass throu gh it to focus on a farther recording layer (66). This allows the farther recording layers (66) to be written using reasonable laser power.

    Laminated magnetic recording media
    27.
    发明专利
    Laminated magnetic recording media 未知

    公开(公告)号：AU6929901A

    公开(公告)日：2002-02-05

    申请号：AU6929901

    申请日：2001-07-06

    Applicant: IBM

    Inventor： FULLERTON ERIC EDWARD ,  MARGULIES DAVID THOMAS ,  ROSEN HAL JERVIS

    IPC: G11B5/65 ,  C23C28/00 ,  C23C28/02 ,  G11B5/64 ,  G11B5/66 ,  G11B5/673 ,  G11B5/708 ,  G11B5/738 ,  H01F10/26

    Abstract: A laminated magnetic recording medium for data storage uses a magnetic recording layer having at least two antiferromagnetically-coupled (AFC) layers spaced apart by a nonferromagnetic spacer layer. Each AFC layer is formed as two ferromagnetic films antiferromagnetically coupled together across an antiferromagnetically coupling film that has a composition and thickness to induce antiferromagnetic coupling of the second film to the first film. The magnetic moments of the two antiferromagnetically-coupled films in each AFC layer are oriented antiparallel, and thus the net remanent magnetization-thickness product (Mrt) of each AFC layer is the difference in the Mrt values of the two ferromagnetic films. The nonferromagnetic spacer layer between neighboring AFC layers has a composition and thickness to prevent any antiferromagnetic coupling of the ferromagnetic films of one AFC layer with the ferromagnetic films of the neighboring AFC layer.

    28.
    发明专利
    未知

    公开(公告)号：AT197652T

    公开(公告)日：2000-12-15

    申请号：AT96901436

    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.

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