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11 条记录 (耗时 0.018 秒)

    Magneto optic data storage read out apparatus and method
    3.
    发明授权
    Magneto optic data storage read out apparatus and method 失效
    磁光数据存储读出装置和方法

    公开(公告)号：US5119352A

    公开(公告)日：1992-06-02

    申请号：US568916

    申请日：1990-08-17

    申请人： Bernard W. Bell, Jr.

    发明人： Bernard W. Bell, Jr.

    IPC分类号： G06K7/10 ,  G11B7/135 ,  G11B11/10 ,  G11B11/105

    CPC分类号： G11B11/10545 ,  G11B11/10515 ,  G11B7/1367

    摘要： A magneto optical head assembly combining a single high extinction polarizing beam splitter utilized to separate and analyze a light beam, a pair of half-wave plates, each having a fast axis with respect to the polarization direction of light transmitted through the head assembly, with the angle of the fast axis of one of the half-wave plates preferably being equal but opposite that of the angle of the fast axis of the remaining half-wave plate. The light beam is transmitted through the head assembly polarizing beam splitter to be polarized with one half of the transmitted polarized light passing through one of the half-wave plates and the remaining half of the transmitted polarized light passing through the other half-wave plate. The portion of the transmitted polarized light which passes through each half-wave plate is rotated about the fast axis of each plate and focused upon a point on a magnetic recording medium. The light is reflected off the magnetic recording medium, with its attendant Kerr rotation, back through the other half-wave plate into the polarizing beam splitting portion of the head assembly. The beam splitter directs a portion of the reflected light beam to a pair of photo detectors. The polarizing output signals of these detectors are coupled into a differential amplifier where the common signal components cancel, leaving only the Kerr rotation signals component which is indicative of the magnetization state of that point on the magnetic recording medium where the light is focused.

    摘要翻译： 一种组合用于分离和分析光束的单个高消光偏振光束分离器的磁光头组件，一对半波片，每个半波片具有相对于透过头组件的光的偏振方向的快轴， 半波片之一的快轴的角度优选地等于但与剩余半波片的快轴的角度相反。 光束通过头部组件偏振光束分离器透射，使得偏振的透射偏振光的一半通过半波片中的一个，剩余的一半透射的偏振光通过另一个半波片。 穿过每个半波片的透射偏振光的部分围绕每个板的快轴旋转并聚焦在磁记录介质上的点上。 光从磁记录介质反射，其伴随的克尔旋转，通过另一半波片返回到头组件的偏振分束部分。 分束器将一部分反射光束引导到一对光电检测器。 这些检测器的极化输出信号被耦合到差分放大器中，其中公共信号分量消除，仅留下表示该光聚焦的磁记录介质上该点的磁化状态的克尔旋转信号分量。

    Wedge prism assembly for optical information storage
    4.
    发明授权
    Wedge prism assembly for optical information storage 失效
    WEDGE PRISM大会用于光信息存储

    公开(公告)号：US5070493A

    公开(公告)日：1991-12-03

    申请号：US355738

    申请日：1989-05-22

    申请人： Daniel R. Marshall ,  David K. Campbell ,  Bernard W. Bell, Jr. ,  David K. Towner

    发明人： Daniel R. Marshall ,  David K. Campbell ,  Bernard W. Bell, Jr. ,  David K. Towner

    IPC分类号： G11B11/10 ,  G11B7/135 ,  G11B7/22 ,  G11B11/105

    CPC分类号： G11B7/1356

    摘要： An optical assembly incorporating a wedge-shaped optically transparent prism, a 45 degree right isosceles triangular prism which has two thin film coated surfaces, a rhomboidal prism attached to the triangular prism, a second, smaller 45 degree right isosceles triangular prism attached to one end face of the rhomboidal prism and two planoconvex lenses attached to the combination of the rhomboidal and second triangular prisms is mounted within a housing. All of the optical components are cemented to the adjacent component utilizing a transparent optical cement to form an integral unit. Data and servo detector assemblies and a diode laser light source are mounted on the external surfaces of the housing to form a stationary optical assembly which provides the following functions: generates a collimated beam of light whose power output may be modulated electronically to perform read, write and erase functions; generates an electrical data signal derived from a portion of a returning light beam; and generates suitable electrical error signals for servomechanical control of radial and axial motion of a focused light spot on information storage media.

    Differential detection assembly for data retrieval from a data storage disk
    7.
    发明授权
    Differential detection assembly for data retrieval from a data storage disk 失效
    差分检测组件，用于从数据存储磁盘进行数据检索

    公开(公告)号：US5400306A

    公开(公告)日：1995-03-21

    申请号：US71169

    申请日：1993-06-02

    申请人： Bernard W. Bell, Jr.

    发明人： Bernard W. Bell, Jr.

    IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/13 ,  G11B11/10 ,  G11B11/105 ,  G11B11/00

    CPC分类号： G11B7/13 ,  G11B11/10515 ,  G11B11/10545 ,  G11B11/10569

    摘要： An optical assembly for detecting a light beam returning from an optical storage media and generating a signal representative of the information stored on the storage media wherein the optical assembly includes a first photodetector that is positioned in the path of the returning light beam at a predetermined angle, so that p polarized light contained in the light beam will be absorbed by the first photodetector and s polarized light will be reflected and redirected toward a second photodetector, which is positioned in the path of the redirected s polarized light and perpendicular to the path of the s polarized light, such that substantially all of the s polarized light is absorbed by the second photodetector and the photocurrents produced by the two photodetectors are differenced to produce a signal representative of the information stored on the storage disk.

    摘要翻译： 一种光学组件，用于检测从光学存储介质返回的光束并产生代表存储在存储介质上的信息的信号，其中光学组件包括位于返回光束的路径中的预定角度的第一光电检测器 使得包含在光束中的p偏振光将被第一光电检测器吸收，并且s偏振光将被反射并被重定向到第二光电检测器，该第二光电检测器位于重定向的s偏振光的路径中并垂直于 s偏振光，使得基本上所有的s偏振光被第二光电检测器吸收，并且由两个光电检测器产生的光电流不同，以产生表示存储在存储盘上的信息的信号。

    Electronic offset compensation of the continuous composite track error signal in optical recording
    9.
    发明授权
    Electronic offset compensation of the continuous composite track error signal in optical recording 失效
    光学记录中连续复合轨迹误差信号的电子偏移补偿

    公开(公告)号：US5197058A

    公开(公告)日：1993-03-23

    申请号：US664881

    申请日：1991-03-05

    申请人： Bernard W. Bell, Jr. ,  David K. Campbell ,  Henryk Birecki

    发明人： Bernard W. Bell, Jr. ,  David K. Campbell ,  Henryk Birecki

    IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/085 ,  G11B7/09 ,  G11B7/095

    CPC分类号： G11B7/08517 ,  G11B7/094

    摘要： When doing multitrack seek or a single track jump, the midpoint between the maximum and the minimum of a tracking error signal is determined. A peak detector detects the positive peak and the negative peak. These maximum and minimum values are stored in a sample and hold circuit. A summing circuit determines the midpoint between the maximum and the minimum of the tracking error signal. An operational amplifier provides a true error signal to the servo control system that provides the appropriate servo operating point. The invention is based on the fact that even though there is no absolute reference signal indicating the appropriate on-track position, the tracking servo system obtains the track error over the whole range of positions relative to track center when doing a multitrack seek or a single track jump. The appropriate servo operating point is the midpoint between the maximum and the minimum of the track error signal. This provides compensation for level shifts due to factors such as beam displacement, or detector mispositioning, changes in read/write beam profile, and disk tilt. The present invention solves the key disadvantage of the continuous groove tracking method by eliminating tracking offsets without adding additional information to the disk. It also avoids imposing overhead on the data channel. It compensates for effects of disk tilt, detector misalignment, detector and amplifier offsets, and beam decentration due to fine tracking.

    Pseudo telecentric optical storage system
    10.
    发明授权
    Pseudo telecentric optical storage system 失效
    伪远心光存储系统

    公开(公告)号：US06608808B1

    公开(公告)日：2003-08-19

    申请号：US09258093

    申请日：1999-02-24

    申请人： Bernard W. Bell, Jr. ,  Amit Jain

    发明人： Bernard W. Bell, Jr. ,  Amit Jain

    IPC分类号： G11B700

    CPC分类号： G11B7/122 ,  G11B7/0901 ,  G11B7/1387 ,  G11B2007/13727

    摘要： An electro-optical storage system based on air-bearing-suspended optical head in a near-field configuration. The optical head effects a lens having front and rear focal planes. The head is spaced from an optical medium by a fraction of a wavelength. An imaging lens is positioned relative to the optical head so that the image of a beam steering element is at a focal plane of the optical head close to the imaging lens to form a telecentric system to minimize beam walk. More preferably, the imaging lens is positioned to deviate the image plane of the beam steering element away from the focal plane of the optical head by a desired spacing to form a pseudo telecentric system to minimize energy asymmetry in the reflected beam.

    摘要翻译： 一种基于近场配置的空气悬挂光头的电光存储系统。 光学头影响具有前和后焦平面的透镜。 头部与光学介质隔开一小部分波长。 成像透镜相对于光学头定位，使得光束操纵元件的图像处于靠近成像透镜的光学头的焦平面，以形成远心系统以最小化光束行进。 更优选地，成像透镜被定位成将光束操纵元件的像平面偏离光学头的焦平面所需的间隔，以形成伪远心系统，以最小化反射光束中的能量不对称性。