公开(公告)号：US6020985A

公开(公告)日：2000-02-01

申请号：US191314

申请日：1998-11-13

申请人： Robert R. McLeod ,  Sergei L. Sochava ,  Andrew J. Daiber ,  Mark E. McDonald ,  Lambertus Hesselink ,  Ingolf Sander ,  Timothy M. Slagle

发明人： Robert R. McLeod ,  Sergei L. Sochava ,  Andrew J. Daiber ,  Mark E. McDonald ,  Lambertus Hesselink ,  Ingolf Sander ,  Timothy M. Slagle

IPC分类号： G11B7/00 ,  G11B7/003 ,  G11B7/0065 ,  G11B7/125 ,  G11B7/135 ,  G11B15/62 ,  G03H1/26

CPC分类号： G11B7/1356 ,  G11B15/62 ,  G11B7/0065 ,  G11B7/127 ,  G03H2270/23 ,  G11B2007/0013 ,  G11B7/003 ,  G11B7/135

摘要： Digital data bits are stored as discrete-level reflection microholograms in a multi-depth digital optical data storage system. Reference and signal beams are incident in a counterpropagating geometry on opposite faces of a tape. The reflection microholograms are stored at the coinciding focus of the reference and signal beams. The holograms are stored at the diffraction limit of high-N.A. optics, and have relatively high grating frequencies and small sizes. Dynamic aberration compensators correct for the depth-varying spherical aberration imparted to the beams by the medium. Multiple mutually-incoherent lasers are used for parallel storage and retrieval to increase data transfer rates. Achievable densities and signal-to-noise ratios are substantially higher than for index-perturbation or transmission hologram storage methods.

摘要翻译： 数字数据位作为离散级反射微时刻图存储在多深度数字光学数据存储系统中。 参考信号光束和信号光束以相反的几何形状入射到磁带的相对面上。 反射微积分线存储在参考和信号光束的重合焦点处。 全息图以高N.A的衍射极限存储。 光学元件，并具有较高的光栅频率和小尺寸。 动态像差补偿器校正由介质赋予光束的深度变化的球面像差。 多个相互不相干的激光器用于并行存储和检索以提高数据传输速率。 可实现的密度和信噪比显着高于指数扰动或透射全息图存储方法。

公开(公告)号：US06563779B1

公开(公告)日：2003-05-13

申请号：US09595433

申请日：2000-06-15

申请人： Mark E. McDonald ,  Robert R. McLeod ,  Andrew J. Daiber

发明人： Mark E. McDonald ,  Robert R. McLeod ,  Andrew J. Daiber

IPC分类号： G11B700

CPC分类号： G11B7/0938 ,  G11B7/00781 ,  G11B7/0901 ,  G11B7/1381 ,  G11B7/24044 ,  G11B2007/0013

摘要： A tracking error signal generation apparatus and method which utilizes confocal detection with a split detector and a differencing circuit for generation of tracking error signals. A first lens is positioned in the path of a light beam returning from an optical medium. A pinhole is positioned in the path of the light beam after the first lens and proximate to the focal plane of the first lens. A second lens is positioned in the path of the light beam after the pinhole, and a split detector, having equal halves is positioned in the path of the light beam after the second lens. A differencing circuit is operatively coupled to each of the halves of the split detector. In operation, a light beam is focused by an optical head onto a track in the optical medium, and the reflection of the beam from the optical medium is directed through the first lens, through the pinhole, through the second lens, and onto the split detector. When the focus of the light beam is centered on the track, the reflected light reaching the split detector is evenly distributed on the two halves of the detector, such that the differencing circuit will generate a tracking error signal (TES) having nominally a zero value. When the focus of the light beam is off-center with respect to the track, the reflected light received by detector is unevenly distributed on the two halves of the detector such that the differencing circuit generates a non-zero tracking error signal, which will be of positive or negative value depending upon the direction off-center of the light beam focus spot. The tracking error signals thus generated are communicated to a servo system which will reposition the optical head to maintain the light beam focus spot on the center of the track.

摘要翻译： 一种跟踪误差信号产生装置和方法，其利用具有分离检测器的共焦检测和用于产生跟踪误差信号的差分电路。 第一透镜位于从光学介质返回的光束的路径中。 针孔位于第一透镜之后的光束的路径中并且靠近第一透镜的焦平面。 第二透镜位于针孔之后的光束的路径中，并且具有相等的一半的分割检测器位于第二透镜之后的光束的路径中。 差分电路可操作地耦合到分离检测器的每个半部。 在操作中，光束被光学头聚焦在光学介质中的轨道上，并且来自光学介质的光束的反射通过第一透镜，穿过针孔穿过第二透镜并被引导到分裂 探测器。 当光束的焦点以轨迹为中心时，到达分割检测器的反射光均匀分布在检测器的两半上，使得差分电路将产生标称为零值的跟踪误差信号（TES） 。 当光束的焦点相对于轨道偏心时，由检测器接收的反射光不均匀地分布在检测器的两半上，使得差分电路产生非零跟踪误差信号，这将是 取决于光束聚焦点的偏心方向的正值或负值。 如此生成的跟踪误差信号被传送到伺服系统，该伺服系统将重新定位光头以将光束聚焦点保持在轨道的中心。

公开(公告)号：US06549664B1

公开(公告)日：2003-04-15

申请号：US09343933

申请日：1999-06-30

申请人： Andrew J. Daiber ,  Robert R. McLeod ,  Ray Snyder

发明人： Andrew J. Daiber ,  Robert R. McLeod ,  Ray Snyder

IPC分类号： G06K936

CPC分类号： G03H1/26 ,  G11B7/0065

摘要： A method for storing data in a holographic storage medium comprises the steps of dividing a bit stream of binary data into data groups, encoding the data groups as binary patterns, and storing the binary patterns holographically as data pages. Each binary pattern comprises channel bits, wherein the number of “off” channel bits is greater than the number of “on” channel bits. To retrieve information from the storage medium, the medium is illuminated and resultant light signals are gathered. The light signals are converted to the binary patterns, and the binary patterns are converted to the data groups. Binary patterns stored in the storage medium only slightly perturb subsequent reading and writing of data, since the patterns have fewer “on” channel bits than “off” channel bits.

摘要翻译： 一种用于在全息存储介质中存储数据的方法包括以下步骤：将二进制数据的位流划分为数据组，将数据组编码为二进制模式，并将二进制模式全息地存储为数据页。 每个二进制模式包括信道位，其中“关”通道位的数量大于“通”位的数量。 为了从存储介质检索信息，照明介质并收集合成的光信号。 光信号被转换为二进制模式，二进制模式被转换成数据组。 存储在存储介质中的二进制模式仅稍微扰乱后续的数据读取和写入，因为模式比“关闭”通道位具有更少的“开”通道位。

公开(公告)号：US06322933B1

公开(公告)日：2001-11-27

申请号：US09229457

申请日：1999-01-12

申请人： Andrew J. Daiber ,  Robert R. McLeod ,  Tokuyuki Honda

发明人： Andrew J. Daiber ,  Robert R. McLeod ,  Tokuyuki Honda

IPC分类号： G03H126

CPC分类号： G11B7/24085 ,  G03H1/30 ,  G11B7/0065 ,  Y10S430/146

摘要： A photoactive medium has a complex format grating written thereon, the complex format grating including at least three component gratings, each of the component gratings characterized by a unique grating vector. Methods for writing the complex format grating include the steps of providing a photoactive medium; and focussing a plurality of pairs of mutually coherent light beams into a focal plane in the medium.

摘要翻译： 光敏介质具有写在其上的复杂格式光栅，复格式光栅包括至少三个分量光栅，每个分量光栅的特征在于唯一的光栅矢量。 写入复杂格式光栅的方法包括提供光活性介质的步骤; 并将多对相互相干的光束聚焦到介质中的焦平面中。

公开(公告)号：US6091549A

公开(公告)日：2000-07-18

申请号：US59868

申请日：1998-04-14

申请人： Mark E. McDonald ,  Andrew J. Daiber

发明人： Mark E. McDonald ,  Andrew J. Daiber

IPC分类号： G02B27/00 ,  G11B7/135 ,  G02B27/14 ,  G02B3/02

CPC分类号： G11B7/1374 ,  G02B27/0068 ,  G11B7/13925 ,  G11B2007/13727

摘要： Two lenses separated by an air gap provide spherical aberration compensation and focusing of a light beam to a focal point inside a data storage medium. The thickness of the air gap determines the amount of spherical aberration compensation provided. The distance between the lens pair and storage medium determines the depth of the focal point within the storage medium. The internal surfaces of the lenses which define the air gap are preferably planar. The external surfaces of the lenses are aspheric to provide accurate focusing and positive spherical aberration. The air gap between the lenses may also be formed by curved internal surfaces, in which case it is best for the focus lens to have a concave internal surface. The apparatus and method of the present invention reduces the number of optical components required for an optical data reading/writing device.

摘要翻译： 由气隙分开的两个透镜提供球面像差补偿并将光束聚焦到数据存储介质内的焦点。 气隙的厚度决定了球面像差补偿量。 透镜对和存储介质之间的距离确定存储介质内焦点的深度。 限定气隙的透镜的内表面优选是平面的。 透镜的外表面是非球面的，以提供精确的聚焦和正的球面像差。 透镜之间的空气间隙也可以由弯曲的内表面形成，在这种情况下，聚焦透镜最好具有凹的内表面。 本发明的装置和方法减少了光学数据读/写装置所需的光学部件的数量。

公开(公告)号：US06574174B1

公开(公告)日：2003-06-03

申请号：US09549075

申请日：2000-04-15

申请人： James R. Amble ,  Lambrerrtus Hesselink ,  Tokyuki Honda ,  Mark E. McDonald ,  Michael V. Morelli ,  Andrew J. Daiber ,  Herman A. Ferrier ,  Sanjoy Ghose ,  Thomas A. Kridl ,  Matthew Lipson ,  Shunichi Nishimura ,  Sergei Sochava ,  LeRoy A. Volz

发明人： James R. Amble ,  Lambrerrtus Hesselink ,  Tokyuki Honda ,  Mark E. McDonald ,  Michael V. Morelli ,  Andrew J. Daiber ,  Herman A. Ferrier ,  Sanjoy Ghose ,  Thomas A. Kridl ,  Matthew Lipson ,  Shunichi Nishimura ,  Sergei Sochava ,  LeRoy A. Volz

IPC分类号： G11B700

CPC分类号： G11B7/0065 ,  G11B7/007 ,  G11B7/0938 ,  G11B7/24 ,  G11B7/2433 ,  G11B7/245 ,  G11B7/246 ,  G11B7/2472 ,  G11B7/252 ,  G11B7/2595 ,  G11B2007/0013

摘要： An optical information storage system using optical storage media including multiple data layers or stacks wherein each of the multiple data stacks has a storage density comparable to a conventional single layer optical disk. The optical data storage system comprises an optical medium having a single dedicated servo layer and multiple data stacks which each contain an embedded servo format, a servo laser beam positioned to maintain a first focus point on the dedicated servo reference layer, a read-write laser beam positioned to maintain a second focus point on one of the data stacks, a first, dedicated servo system which provides focus and tracking error correction according to error signals generated from the dedicated servo layer, and a second, embedded servo system which provides focus and tracking error correction according to error signals generated from the data stacks. The dedicated servo layer, in different embodiments of the invention, may be positioned either below or above the data stacks in the optical medium, or interposed between data stacks. The data stacks may comprise discrete physical data layers or “virtual” data layers defined by a format hologram. The servo and read-write lasers may differ in wavelength and/or polarization.

摘要翻译： 一种使用包括多个数据层或堆叠的光学存储介质的光学信息存储系统，其中多个数据堆栈中的每一个具有与常规单层光盘相当的存储密度。 光学数据存储系统包括具有单个专用伺服层的光学介质和各自包含嵌入式伺服格式的多个数据堆栈，定位成将第一焦点保持在专用伺服参考层上的伺服激光束，读写激光器 光束定位成在数据堆叠之一上保持第二焦点，第一专用伺服系统，其根据从专用伺服层产生的误差信号提供聚焦和跟踪误差校正;以及第二嵌入式伺服系统，其提供焦点和 根据从数据堆产生的误差信号进行跟踪误差校正。 在本发明的不同实施例中的专用伺服层可以位于光学介质中的数据堆的下方或上方，或者位于数据堆之间。 数据堆可以包括由格式全息图定义的离散物理数据层或“虚拟”数据层。 伺服和读写激光器的波长和/或极化可能不同。

公开(公告)号：US06288804B1

公开(公告)日：2001-09-11

申请号：US09640906

申请日：2000-08-16

申请人： Andrew J. Daiber ,  Mark E. McDonald

发明人： Andrew J. Daiber ,  Mark E. McDonald

IPC分类号： G02B532

CPC分类号： G03H1/30 ,  G03H2001/0417 ,  G03H2222/31 ,  G03H2230/10 ,  G11B7/0065 ,  G11B7/1362 ,  G11B7/13927

摘要： A positive unit magnification reflective head is used to back-reflect a primary light beam, for storing reflection microholograms at the coincident foci of the primary and reflected beams. Imaging the primary beam focus onto itself at positive unit magnification allows increasing system tolerance to tilts and transverse misalignments between the primary and reflective heads. Holograms are stored at multiple depths in a holographic storage medium. Tunable-focus primary and reflective heads are positioned on opposite sides of the storage medium. The reflective head images each storage location onto itself at positive unit magnification. Suitable reflective heads include: two lenses in an f-2f-f configuration and a planar mirror; a lens and a corner cube; a thin lens and a thick lens with a coated reflective back surface; and a thin lens and a back-coated gradient-index (GRIN) lens. To control the polarization of the reflected beam, the corner cube may include a plastic filler bonded on the back of the reflective surface. The filler index of refraction is chosen such that the primary beam is incident on the reflective surface of the corner cube at the critical angle.

摘要翻译： 正单位放大率反射头用于反射一次光束，用于在初级和反射光束的重合焦点处存储反射微波照相。 将主光束聚焦以正单位放大率成像，可以增加系统对初级和反射头之间的倾斜和横向不对准的容差。 全息图存储在全息存储介质中的多个深度处。 可调聚焦主反射头位于存储介质的相对侧。 反射头以正单位放大率将每个存储位置映射到自身上。 合适的反射头包括：f-2f-f构造的两个透镜和平面镜; 镜头和角落立方体; 薄透镜和具有涂层反射背面的厚透镜; 以及薄透镜和背涂层梯度折射率（GRIN）透镜。 为了控制反射光束的偏振，角隅棱镜可以包括粘合在反射表面背面上的塑料填料。 选择填料折射率使得主光束以临界角入射在角立方体的反射表面上。

公开(公告)号：US06540397B2

公开(公告)日：2003-04-01

申请号：US09828693

申请日：2001-04-05

申请人： Jiro Yoshinari ,  Takuya Tsukagoshi ,  Hideki Hirata ,  Naoki Hayashida ,  Tokuyuki Honda ,  Mark E. McDonald ,  Michael V. Morelli ,  Andrew J. Daiber ,  Sanjoy Ghose ,  Lambertus Hesselink ,  Shunichi Nishimura ,  Sergei Sochava

发明人： Jiro Yoshinari ,  Takuya Tsukagoshi ,  Hideki Hirata ,  Naoki Hayashida ,  Tokuyuki Honda ,  Mark E. McDonald ,  Michael V. Morelli ,  Andrew J. Daiber ,  Sanjoy Ghose ,  Lambertus Hesselink ,  Shunichi Nishimura ,  Sergei Sochava

IPC分类号： G04B3700

CPC分类号： G11B7/0065 ,  G11B7/007 ,  G11B7/0938 ,  G11B7/24 ,  G11B7/243 ,  G11B7/244 ,  G11B7/2534 ,  G11B7/2595 ,  G11B2007/0013

摘要： An optical information medium comprising at least two data layers for bearing recorded information, and a servo layer for bearing tracking servo, information which is independently formed from the data layers; wherein the medium is used with a recording or reading system wherein a data beam for recording or reading the data in the data layer and a servo beam for reading the tracking servo information in the servo layer are used, and the servo layer is read by the servo beam that had passed through the data layer; and a filter layer is disposed between the data layer and the servo layer, and the filter layer exhibits higher absorption to the data beam than to the servo beam.

摘要翻译： 一种光信息介质，包括用于承载记录信息的至少两个数据层，以及用于承载跟踪伺服的伺服层，由数据层独立地形成的信息; 其中介质与记录或读取系统一起使用，其中使用用于记录或读取数据层中的数据的数据束和用于读取伺服层中的跟踪伺服信息的伺服光束，并且伺服层被读取 通过数据层的伺服光束; 并且在数据层和伺服层之间设置过滤层，并且过滤层对数据束的吸收比对伺服光束的吸收更高。

公开(公告)号：US06331904B1

公开(公告)日：2001-12-18

申请号：US09477230

申请日：2000-01-04

申请人： Andrew J. Daiber ,  Mark E. McDonald

发明人： Andrew J. Daiber ,  Mark E. McDonald

IPC分类号： G03H122

CPC分类号： H04N5/7458 ,  G02B17/0605 ,  G02B17/0812 ,  G03H1/02 ,  G03H1/26 ,  G03H1/265 ,  G03H2001/0216 ,  G03H2223/17 ,  G03H2223/24 ,  G06K19/16

摘要： A reference beam telescope, which is also referred to as a relay imaging system for a reference beam, using reflection optics is disclosed. The relay imaging system according to the present invention comprises at least one concave mirror and one convex mirror. A reference beam is reflected at least twice by the concave mirror and once by the convex mirror. The output reference beam is collimated if the input reference beam is collimated. This relay imaging system is used in a holographic storage system to deliver the reference beam to the holographic storage medium. In particular, this system can be used for angular multiplexing in a holographic storage system.

摘要翻译： 公开了一种参考光束望远镜，其也被称为用于参考光束的中继成像系统，其使用反射光学器件。 根据本发明的中继成像系统包括至少一个凹面镜和一个凸面镜。 参考光束由凹面镜反射至少两次，一次由凸面镜反射。 如果输入参考光束被准直，则输出参考光束是准直的。 该中继成像系统用于全息存储系统中以将参考光束传送到全息存储介质。 特别地，该系统可用于全息存储系统中的角度多路复用。

公开(公告)号：US6147782A

公开(公告)日：2000-11-14

申请号：US071478

申请日：1998-05-01

申请人： Andrew J. Daiber ,  Mark E. McDonald

发明人： Andrew J. Daiber ,  Mark E. McDonald

IPC分类号： G03H1/30 ,  G11B7/0065 ,  G11B7/135 ,  G03H1/00

CPC分类号： G03H1/30 ,  G11B7/0065 ,  G11B7/1362 ,  G11B7/13927 ,  G03H2001/0417 ,  G03H2222/31 ,  G03H2230/10

摘要： A positive unit magnification reflective head is used to back-reflect a primary light beam, for storing reflection microholograms at the coincident foci of the primary and reflected beams. Imaging the primary beam focus onto itself at positive unit magnification allows increasing system tolerance to tilts and transverse misalignments between the primary and reflective heads. Holograms are stored at multiple depths in a holographic storage medium. Tunable-focus primary and reflective heads are positioned on opposite sides of the storage medium. The reflective head images each storage location onto itself at positive unit magnification. Suitable reflective heads include: two lenses in an f-2f-f configuration and a planar mirror; a lens and a corner cube; a thin lens and a thick lens with a coated reflective back surface; and a thin lens and a back-coated gradient-index (GRIN) lens. To control the polarization of the reflected beam, the corner cube may include a plastic filler bonded on the back of the reflective surface. The filler index of refraction is chosen such that the primary beam is incident on the reflective surface of the corner cube at the critical angle.

摘要翻译： 正单位放大率反射头用于反射一次光束，用于在初级和反射光束的重合焦点处存储反射微波照相。 将主光束聚焦以正单位放大率成像，可以增加系统对初级和反射头之间的倾斜和横向不对准的容差。 全息图存储在全息存储介质中的多个深度处。 可调聚焦主反射头位于存储介质的相对侧。 反射头以正单位放大率将每个存储位置映射到自身上。 合适的反射头包括：f-2f-f构造的两个透镜和平面镜; 镜头和角落立方体; 薄透镜和具有涂层反射背面的厚透镜; 以及薄透镜和背涂层梯度折射率（GRIN）透镜。 为了控制反射光束的偏振，角隅棱镜可以包括粘合在反射表面背面上的塑料填料。 选择填料折射率使得主光束以临界角入射在角立方体的反射表面上。