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    • 23. 发明授权
    • Method and apparatus for partial self-servo writing using servo wedge propagation
    • 使用伺服楔形传播的部分自伺服写入的方法和装置
    • US07050260B1
    • 2006-05-23
    • US10293904
    • 2002-11-12
    • David M. TungLin GuoDon Brunnett
    • David M. TungLin GuoDon Brunnett
    • G11B21/02
    • G11B5/59633G11B5/59666
    • A method and apparatus for partial self-servo writing a disk surface in a disk drive using servo wedge propagation is provided. In one embodiment, servo information is written by a servo track writer near an outer diameter of the disk surface. The servo information is grouped into a 1× set of servo information and a 2× set of servo information. The disk drive's read head is used to read the 1× set of servo information in order to position the disk drive's write head to write servo information which is radially-aligned with the 2× set of servo information. Then, the disk drive's read head is used to read the 2× set of servo information in order to position the disk drive's write head to write servo information which is radially-aligned with the 1× set of servo information. The process is repeated on a track-by-track basis until servo information is written from the outer diameter of the disk surface to the inner diameter of the disk surface, as if it was entirely written by a servo track writer.
    • 提供了一种使用伺服楔形传播将部分自伺服写入盘驱动器中的盘表面的方法和装置。 在一个实施例中,伺服信息由靠近盘表面的外径的伺服轨迹写入器写入。 伺服信息分为1组伺服信息和2组伺服信息。 磁盘驱动器的读取头用于读取1x组伺服信息,以便将磁盘驱动器的写入头定位成与2组伺服信息径向对齐的伺服信息。 然后,磁盘驱动器的读取头用于读取2组伺服信息,以便将磁盘驱动器的写入头定位成写入与1组伺服信息径向对齐的伺服信息。 在逐个轨道的基础上重复该过程,直到从盘表面的外径到盘表面的内径写入伺服信息为止,就好像完全由伺服记录器写入。
    • 26. 发明授权
    • Parallel servo with ultra high bandwidth off-track detection
    • 具有超高带宽离线检测的并行伺服
    • US06266205B1
    • 2001-07-24
    • US09073600
    • 1998-05-06
    • Erhard T. SchreckLin Guo
    • Erhard T. SchreckLin Guo
    • G11B5596
    • G11B5/00813B82Y10/00B82Y25/00G11B5/012G11B5/09G11B5/3948G11B5/488G11B5/4886G11B5/4969G11B5/4992G11B5/5534G11B5/59622G11B5/59627G11B5/59644G11B5/59683G11B2005/0016G11B2005/3996
    • A magnetic storage system having one or more rotating disks is disclosed. In a preferred embodiment, each rotating disk has two magnetic surfaces which each contain a number of tracks. Each track has one or more data regions and one or more embedded servo sectors. First and second transducers are respectively suspended over first and second tracks corresponding to first and second magnetic surfaces. The second transducer determines an off-track position with respect to the second track by reading from the data region of the second track. Once the off-track position is determined for the second transducer, that information is used to position the first transducer with respect to the first track and position the second transducer with respect to the second track as the first transducer writes to the first track. Furthermore, the first transducer is positioned at a correction rate that exceeds the rate at which the first transducer encounters embedded servo sectors in the first track. As a result, the first transducer reduces or avoids flying-blind as it writes to the disk.
    • 公开了一种具有一个或多个旋转盘的磁存储系统。 在优选实施例中,每个旋转盘具有两个磁性表面,每个磁性表面包含多个磁道。 每个轨道具有一个或多个数据区域和一个或多个嵌入式伺服扇区。 第一和第二换能器分别悬挂在对应于第一和第二磁性表面的第一和第二轨道上。 第二传感器通过从第二磁道的数据区域读取来确定相对于第二磁道的偏离磁道位置。 一旦为第二换能器确定偏离轨迹位置,则该信息用于相对于第一轨道定位第一换能器,并且当第一换能器写入第一轨道时相对于第二轨道定位第二换能器。 此外,第一换能器位于超过第一换能器在第一轨道中遇到嵌入式伺服扇区的速率的校正速率。 因此,第一个传感器会在写入磁盘时减少或避免飞盲。
    • 27. 发明授权
    • Method and apparatus for measuring angular displacement of an actuator arm relative to a reference position
    • US06188484B1
    • 2001-02-13
    • US09182354
    • 1998-10-29
    • Kok-Meng LeeHarry Douglas Garner, Jr.Lin Guo
    • Kok-Meng LeeHarry Douglas Garner, Jr.Lin Guo
    • G01B902
    • G01D5/38G11B5/4806G11B5/596
    • An apparatus for directly measuring an angular displacement of an actuator arm relative to a reference position is disclosed, wherein the actuator arm is rotatable about a fixed axis. The apparatus includes a reflection-type diffraction grating, a light source, a transmission-type diffraction grating and a detector. The reflection-type diffraction grating is mounted on the actuator arm. The light source emits a generally rectangularly-shaped laser beam that is aligned to strike the reflection-type diffraction grating to produce reflected beams. The transmission-type diffraction grating, through which the reflected beams pass, causes the reflected beams to converge and form an interference pattern. The detector is positioned to detect the interference pattern and generate a signal representative of the angular displacement of the actuator arm relative to the reference position. A method of directly measuring an angular displacement of an actuator arm relative to a reference position is also disclosed, wherein the actuator arm is rotatable about a fixed axis. The method includes the steps of: (1) providing a reflection-type diffraction grating which is mounted on the actuator arm, the actuator arm being located at a reference position; (2) directing a generally rectangularly-shaped laser beam to strike the reflection-type diffraction grating to produce reflected beams; (3) positioning a transmission-type diffraction grating, through which the reflected beams pass, which causes the reflected beams to converge; (4) positioning a detector to detect an inference pattern created by the converged beams; (5) determining the phase of the interference pattern; (6) moving the actuator arm to a second position, wherein a second interference pattern is generated; and, (7) computing the phase difference between the second interference pattern and that of the interference pattern generated at the actuator arm's reference position.
    • 28. 发明授权
    • Method and apparatus for simultaneous RF testing of multiple devices in specific frequency bands
    • 用于在特定频带中同时对多个设备进行RF测试的方法和装置
    • US08982936B2
    • 2015-03-17
    • US13443254
    • 2012-04-10
    • Michael Shih Chiang YangLin Guo
    • Michael Shih Chiang YangLin Guo
    • H04B17/00
    • H04B17/29H04B17/0085
    • A system employing vector signal generator (VSG) and vector signal analyzer (VSA) modules or cards that are configured to test multiple devices under test simultaneously. Each VSG is configured to generate multiple RF test signals and send them to multiple devices under test simultaneously. Similarly, each VSA is configured with multiple signal receiving modules connected to a single controller or memory. Each signal receiving module receives an RF signal from a device under test, converts it to a baseband digital signal, and transmits this digital signal to the VSA's memory. A single RF testing system can employ multiple such VSGs and VSAs, each capable of evaluating multiple devices under test. Each VSG/VSA can further be tuned for operation in discrete or defined frequency bands, which are narrower than those for conventional RF testers, and which can correspond to various wireless standards.
    • 使用矢量信号发生器(VSG)和矢量信号分析仪(VSA)模块或卡被配置为同时测试被测试的多个设备的系统。 每个VSG被配置为产生多个RF测试信号,并将它们发送到同时被测试的多个被测器件。 类似地,每个VSA配置有连接到单个控制器或存储器的多个信号接收模块。 每个信号接收模块从被测器件接收RF信号,将其转换为基带数字信号,并将该数字信号发送到VSA的存储器。 单个RF测试系统可以使用多个这样的VSG和VSA,每个能够评估被测试的多个设备。 每个VSG / VSA可以进一步调整为在离散或定义的频带中操作,这些频带比传统的RF测试仪窄,可以对应于各种无线标准。