会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 2. 发明授权
    • Sparse modulation codes for holographic data storage
    • 用于全息数据存储的稀疏调制码
    • US06549664B1
    • 2003-04-15
    • US09343933
    • 1999-06-30
    • Andrew J. DaiberRobert R. McLeodRay Snyder
    • Andrew J. DaiberRobert R. McLeodRay Snyder
    • G06K936
    • G03H1/26G11B7/0065
    • 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.
    • 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。
    • 3. 发明授权
    • Apparatus for holographic data storage
    • 全息数据存储装置
    • US5995251A
    • 1999-11-30
    • US116752
    • 1998-07-16
    • Lambertus HesselinkJohn F. HeanueAndrew J. Daiber
    • Lambertus HesselinkJohn F. HeanueAndrew J. Daiber
    • G11B7/0065G03H1/00
    • G11B7/0065G03H2210/22G03H2260/12
    • A holographic data storage apparatus having no readout lens. The apparatus has a spatial light modulator (SLM), a focusing element such as a lens, a holographic data storage material and a spatial light detector such as a CCD. The lens is located between the SLM and CCD such that the SLM is imaged onto the CCD (i.e. the positions of the SLM, lens, and CCD satisfy the lens equation). The holographic storage material is located between the lens and CCD. Preferably, the storage material is located centered upon a Fourier plane of the lens. In this case, the apparatus also has a phase mask located adjacent to the SLM. Alternatively, the storage material is located a distance away from the Fourier plane or is not centered on the Fourier plane. In yet another embodiment, the holographic storage material is located in contact with the CCD.
    • 一种没有读出透镜的全息数据存储装置。 该装置具有空间光调制器(SLM),诸如透镜的聚焦元件,全息数据存储材料和诸如CCD的空间光检测器。 透镜位于SLM和CCD之间,使得SLM成像到CCD上(即,SLM,透镜和CCD的位置满足透镜等式)。 全息存储材料位于透镜和CCD之间。 优选地,存储材料以透镜的傅立叶平面为中心。 在这种情况下,该装置还具有位于SLM附近的相位掩模。 或者,存储材料位于离傅立叶平面一定距离处,或者不在傅立叶平面上居中。 在另一个实施例中,全息存储材料位于与CCD接触。
    • 4. 发明授权
    • Method and apparatus for adjustable spherical aberration correction and
focusing
    • 用于可调节球面像差校正和聚焦的方法和装置
    • US6091549A
    • 2000-07-18
    • US59868
    • 1998-04-14
    • Mark E. McDonaldAndrew J. Daiber
    • Mark E. McDonaldAndrew J. Daiber
    • G02B27/00G11B7/135G02B27/14G02B3/02
    • G11B7/1374G02B27/0068G11B7/13925G11B2007/13727
    • 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.
    • 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。
    • 8. 发明授权
    • Tracking error signal generation using confocally filtered detection
    • 使用并行滤波检测跟踪误差信号生成
    • US06563779B1
    • 2003-05-13
    • US09595433
    • 2000-06-15
    • Mark E. McDonaldRobert R. McLeodAndrew J. Daiber
    • Mark E. McDonaldRobert R. McLeodAndrew J. Daiber
    • G11B700
    • G11B7/0938G11B7/00781G11B7/0901G11B7/1381G11B7/24044G11B2007/0013
    • 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.
    • 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。
    • 9. 发明授权
    • Positive unit magnification reflective optics for holographic storage
    • 用于全息存储的正单位放大反射光学器件
    • US06288804B1
    • 2001-09-11
    • US09640906
    • 2000-08-16
    • Andrew J. DaiberMark E. McDonald
    • Andrew J. DaiberMark E. McDonald
    • G02B532
    • G03H1/30G03H2001/0417G03H2222/31G03H2230/10G11B7/0065G11B7/1362G11B7/13927
    • 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.
    • 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。