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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
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.
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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
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公开(公告)号：JPH11120615A
公开(公告)日：1999-04-30
申请号：JP17430998
申请日：1998-06-22
Applicant: IBM
Inventor： BOJARCZUK JR NESTOR ALEXANDER , GUHA SUPRATIK , GUPTA ARUNAVA , TANG WADE WAI-CHUNG
Abstract: PROBLEM TO BE SOLVED: To provide a phase transition medium for optical recording by preparing a metal compsn. selected from group III metals for a metal nitride thin film. SOLUTION: This phase transition type medium for optical recording is based on a semiconductor comprising group III metal nitrides such as AlN, InN and GaN. By irradiating the surface of this thin film of a semiconductor having a wide band gap with photons of energy equal to or higher than the band gap of the material with higher output density than the threshold, nitrogen is desorbed to form a metal coating. Once nitrogen is desorbed, the metal phase written on the medium can not return to a nitride phase, and this stabilizes the medium as a write-once system. The band gap when a group III metal nitride alloy is used is continuously varied and controlled by changing the relative ratio of III group metals so that the alloy melts by laser having the photon energy laser in the above range. Thus, the material can be used for the format of plural recording layers with low absorbance and high transmittance when proper recording wavelength is used for the initial phase.
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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
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.
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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
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.
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Patent Agency Ranking
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
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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公开(公告)号：BR9600345A
公开(公告)日：1998-01-27
申请号：BR9600345
申请日：1996-02-07
Applicant: IBM
Inventor： LATTA MILTON RUSSELL , ROSEN HAL JERVIS , RUBIN KURT ALLAN , TANG WADE WAI-CHUNG
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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公开(公告)号：IN192515B
公开(公告)日：2004-04-24
申请号：IN1506DE1994
申请日：1994-11-24
Applicant: IBM
Inventor： IMAINO WAYNE ISAMI , ROSEN HAL JERVIS , RUBIN KURT ALLEN , STRAND TIMOTHY CARL , TANG WADE WAI-CHUNG
IPC: G06K19/00
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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.
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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
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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