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    MULTIPLE DATA LAYER OPTICAL DISK DRIVE SYSTEM WITH FIXED ABERRATION CORRECTION AND OPTIMUM INTERLAYER SPACING
    1.
    发明公开
    MULTIPLE DATA LAYER OPTICAL DISK DRIVE SYSTEM WITH FIXED ABERRATION CORRECTION AND OPTIMUM INTERLAYER SPACING 失效
    带之间的距离FIXED像差和舒适层的多层光盘驱动系统

    公开(公告)号：EP0886857A1

    公开(公告)日：1998-12-30

    申请号：EP96901436

    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 MEDIUM
    3.
    发明专利
    OPTICAL DATA STORAGE MEDIUM 失效

    公开(公告)号：JP2001134985A

    公开(公告)日：2001-05-18

    申请号：JP2000317832

    申请日：2000-10-18

    Applicant: IBM

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

    IPC: B41M5/26 ,  G11B7/00 ,  G11B7/007 ,  G11B7/135 ,  G11B7/1381 ,  G11B7/24 ,  G11B7/253 ,  G11B7/257

    Abstract: PROBLEM TO BE SOLVED: To provide an optical data storage system with which even data from any data layer of an optical medium consisting of plural data is clearly read. SOLUTION: The optical data storage system suitable to a large capacity of storage is composed of the optical medium having a multiple data surface and a driving device including an optical head. A desired data surface is irradiated with laser beams and reflected light is used as a signal by the driving device. When data in a deep data layer is read, since light has to pass through many layers, a weak signal only is obtained. Consequently, signal intensity is difference depending on the data surface. Respective data surface is optimized so that the signal intensity from each data surface becomes nearly equal by using the medium having a coated dielectric reflecting layer and by suitably selecting the coating material and its thickness. In the preferable embodiment, semiconductor material is stuck onto each data surface and the reflecting quantity is decided by the thickness.

    OPTICAL DISK, AND OPTICAL DATA MEMORY SYSTEM
    4.
    发明专利
    OPTICAL DISK, AND OPTICAL DATA MEMORY SYSTEM 失效

    公开(公告)号：JPH10116441A

    公开(公告)日：1998-05-06

    申请号：JP12253097

    申请日：1997-05-13

    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: PROBLEM TO BE SOLVED: To provide an optical data memory system which uses an optical medium having plural recording layers. SOLUTION: The substrate supports recording stacks 90, 92 of plural layers which are spatially separated, and the stacks contain recording layers 53, 64 comprising reversible or rewritable phase transition material in an active state. The recording stack 90 nearest to the substrate where laser light irradiates the surface 49 contains a reverse-writing type reversible phase transition material, namely a phase transition material which having an amorphous initiating phase in which recording is done by heating with a laser beam to change the data region into a crystalline phase. The first recording layer 53 is in contact with dielectric layers 51, 55. These dielectric layers have a higher refractive index than that of the adjacent recording layer and act as optical interference thin film so that these layers give an optical interference effect to enhance the light in the recording stack. These optical interference thin films do not absorb light so that the laser light can be focused on the recording layer in the recording stack 92.

    Recording and reproducing device
    5.
    发明专利
    Recording and reproducing device 有权
    记录和复制设备

    公开(公告)号：JP2006004627A

    公开(公告)日：2006-01-05

    申请号：JP2005236852

    申请日：2005-08-17

    Applicant: Internatl Business Mach Corp ,  インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation

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

    IPC: B41M5/26 ,  G11B7/125 ,  G11B7/00 ,  G11B7/007 ,  G11B7/135 ,  G11B7/18 ,  G11B7/24 ,  G11B7/253 ,  G11B7/257

    CPC classification number: G11B7/2578 ,  G11B7/00718 ,  G11B7/24 ,  G11B7/2531 ,  G11B7/2534 ,  G11B7/2585 ,  G11B2007/0013 ,  G11B2007/25706 ,  G11B2007/25708 ,  G11B2007/2571 ,  G11B2007/25711

    Abstract: PROBLEM TO BE SOLVED: To provide an optical data storage system with which data from any data layer of an optical medium consisting of a plurality of data layers is clearly read. SOLUTION: The optical data storage system suitable to a large capacity storage is composed of the optical medium having a multiple data surface and a driving device including an optical head. A desired data surface is irradiated with laser beams and reflected light is used as a signal by the driving device. When data in a deep data layer is read, since light has to pass through many layers, only a weak signal is obtained. Consequently, signal intensity is difference depending on the data surface. Respective data surface is optimized so that the signal intensity from each data surface becomes nearly equal by using the medium having a coated dielectric reflecting layer and by suitably selecting the coating material and its thickness. In the preferable embodiment, semiconductor material is stuck onto each data surface and the reflecting quantity is decided by the thickness. COPYRIGHT: (C)2006,JPO&NCIPI

    Abstract translation: 要解决的问题：提供一种光学数据存储系统，其中清楚地读取由多个数据层组成的光学介质的任何数据层的数据。 解决方案：适用于大容量存储器的光学数据存储系统由具有多个数据表面的光学介质和包括光学头的驱动装置组成。 用激光束照射期望的数据表面，并且通过驱动装置将反射光用作信号。 当读取深度数据层中的数据时，由于光必须通过许多层，所以仅获得弱信号。 因此，信号强度根据数据表面而不同。 优化各个数据表面，使得通过使用具有涂覆的电介质反射层的介质和通过适当选择涂层材料及其厚度，来自每个数据表面的信号强度几乎相等。 在优选实施例中，将半导体材料粘贴到每个数据表面上，并且反射量由厚度决定。 版权所有（C）2006，JPO＆NCIPI

    MAGNETIC RECORDING MEDIUM
    6.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JP2001148110A

    公开(公告)日：2001-05-29

    申请号：JP2000307398

    申请日：2000-10-06

    Applicant: IBM

    Inventor： CAREY MATTHEW JOSEPH ,  FULLERTON ERIC EDWARD ,  GURNEY BRUCE ALVIN ,  ROSEN HAL JERVIS ,  SCHABES MANFRED ERNST

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

    Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium for keeping good thermal stability and SNR and supporting ultra high-density recording. SOLUTION: This magnetic recording medium for a data storage device is constituted of at least two magnetic recording layers of ferromagnetic films, which are adhered to each other in an antiferromagnetic manner, while interposing a nonferromagnetic spacer film. Magnetic moment of one ferromagnetic film works in the direction antiparallel to that of the magnetic moment of the other ferromagnetic film. The balanced magnetic moment is shown as the difference between Mrt values of two ferromagnetic films, when the magnetic moment is shown by net product (Mrt) of residual magnetism (Mr) and thickness (t) in the magnetic recording layer. The decrease in Mrt is achieved, while the thermal stability of the recording medium is not deteriorated, because the volume of particles in ferromagnetic films adhered to each other in an antiferromagnetic manner is increased constructively. Very sharp magnetic transitions can be achieved by the reduced antimagnetic field and higher density of the bit lines can be obtained in this medium as a result.

    OPTICAL DATA LOGGER SYSTEM AND OPTICAL DATA LOGGER DISK
    7.
    发明专利
    OPTICAL DATA LOGGER SYSTEM AND OPTICAL DATA LOGGER DISK 未知

    公开(公告)号：HU224498B1

    公开(公告)日：2005-10-28

    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.

    Magnetic recording media with antiferromagnetically coupled ferromagnetic film
    10.
    发明专利
    Magnetic recording media with antiferromagnetically coupled ferromagnetic film 未知

    公开(公告)号：GB2355018A

    公开(公告)日：2001-04-11

    申请号：GB0015023

    申请日：2000-06-21

    Applicant: IBM

    Inventor： CAREY MATTHEW JOSEPH ,  FULLERTON ERIC EDWARD ,  GURNEY BRUCE ALVIN ,  ROSEN HAL JERVIS ,  SCHABES MANFRED ERNST

    IPC: G11B5/708 ,  C23C28/00 ,  C23C28/02 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/673 ,  G11B5/738 ,  H01F10/26 ,  C23C14/14 ,  C23C14/16 ,  G11B5/62 ,  G11B5/84

    Abstract: A magnetic recording medium for data storage uses a magnetic recording layer having at least two ferromagnetic films antiferromagnetically coupled together across a nonferromagnetic spacer film. The magnetic moments of the two antiferromagnetically-coupled films are oriented antiparallel, and thus the net remanent magnetisation-thickness product (Mrt) of the recording layer is the difference in the Mrt values of the two ferromagnetic films. This reduction in Mrt is accomplished without a reduction in the thermal stability of the recording medium because the volumes of the grains in the antiferromagnetically-coupled films add constructively. In a magnetic recording rigid disk application, the magnetic layer comprises two ferromagnetic films, each a granular film of a sputter deposited coPtCrB alloy, separated by a Ru spacer film having a thickness to maximise the antiferromagnetic exchange coupling between the two CoPtCrB films. One of the ferromagnetic films is made thicker than the other, but the thicknesses are chosen so that the net moment in zero applied magnetic field is low, but nonzero. In general the first and second ferromagnetic films are made of a material selected from Co, Fe, Ni and their alloys. Apart from ruthenium the spacer film may be formed of Cr, Rh, Ir, Cu and their alloys. The medium may be in the form of a disk which has an underlayer on the substrate and a protective overcoat formed on the magnetic recording layer.

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