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    Tape drive velocity control
    3.
    发明授权
    Tape drive velocity control 失效
    磁带机速度控制

    公开(公告)号：US08405926B2

    公开(公告)日：2013-03-26

    申请号：US12842938

    申请日：2010-07-23

    申请人： Nhan Xuan Bui ,  Reed Alan Hancock ,  Randy Clark Inch ,  Shuhei Nadehara ,  Eiji Ogura ,  Kazuhiro Tsuruta

    发明人： Nhan Xuan Bui ,  Reed Alan Hancock ,  Randy Clark Inch ,  Shuhei Nadehara ,  Eiji Ogura ,  Kazuhiro Tsuruta

    IPC分类号： G11B15/52 ,  G11B15/46

    CPC分类号： G11B15/32 ,  G11B15/46 ,  G11B15/52

    摘要： In accordance with the present invention, a method of operating a magnetic tape drive, a magnetic tape drive and a servo control system are provided for obtaining and maintaining velocity control in a magnetic tape drive. In one embodiment, a method is provided for operating a magnetic tape drive. The tape drive includes a plurality of DC motors, and each DC motor has a plurality of Hall sensors. The DC motors are under the control of a servo system which is configured to read location information from the magnetic tape, and compute a primary tape velocity from the location information, and sense a secondary and tertiary velocity signal and compute a tape velocity based on one of the sensed secondary velocity signal and tertiary velocity. The method includes detecting if the primary velocity location information is available. In response to detecting that the primary velocity location information is available the primary velocity is employed to control the servo system. In response to detecting the primary velocity location information is unavailable then one of a secondary or a tertiary velocity signal is employed. The secondary velocity signal is employed when an absolute value of a term related to tape velocity is less than a predetermined value. The tertiary velocity signal is employed when the absolute value of the term related to tape velocity is greater than the predetermined value.

    摘要翻译： 根据本发明，提供了一种操作磁带驱动器，磁带驱动器和伺服控制系统的方法，用于获得和维持磁带驱动器中的速度控制。 在一个实施例中，提供了一种用于操作磁带驱动器的方法。 磁带驱动器包括多个DC电动机，并且每个DC电动机具有多个霍尔传感器。 直流电动机处于伺服系统的控制之下，伺服系统被配置为从磁带读取位置信息，并从位置信息计算主带速度，并感测二次和三次速度信号，并基于一个速度信号计算磁带速度 的感测二次速度信号和三次速度。 该方法包括检测主速度位置信息是否可用。 响应于检测到主速度位置信息可用，主速度被用于控制伺服系统。 响应于检测到主速度位置信息不可用，则采用次速或三速信号中的一个。 当与磁带速度相关的项的绝对值小于预定值时，采用二次速度信号。 当与磁带速度相关的项的绝对值大于预定值时，采用三次速度信号。

    Method of manufacturing silicon carbide semiconductor device
    6.
    发明授权
    Method of manufacturing silicon carbide semiconductor device 有权
    制造碳化硅半导体器件的方法

    公开(公告)号：US08216929B2

    公开(公告)日：2012-07-10

    申请号：US12923205

    申请日：2010-09-09

    申请人： Jun Kawai ,  Kazuhiro Tsuruta

    发明人： Jun Kawai ,  Kazuhiro Tsuruta

    IPC分类号： H01L21/283

    CPC分类号： H01L29/7828 ,  H01L21/0485 ,  H01L21/268 ,  H01L29/1608 ,  H01L29/34 ,  H01L29/41766 ,  H01L29/45 ,  H01L29/66068

    摘要： In a method of manufacturing a silicon carbide semiconductor device, a semiconductor substrate made of silicon carbide and having first and second opposing surfaces is prepared. The second surface of the semiconductor substrate is processed so that a surface roughness of the second surface is less than or equal to 10 nm and a value of (100%-reflectance-transmittance) at a wavelength of a laser light is greater than or equal to 80%. A metal layer is formed on the second surface of the semiconductor substrate after the processing the second surface. The metal layer is irradiated with the laser light and thereby an ohmic electrode is formed on the second surface.

    摘要翻译： 在制造碳化硅半导体器件的方法中，制备由碳化硅制成并具有第一和第二相对表面的半导体衬底。 处理半导体基板的第二表面，使得第二表面的表面粗糙度小于或等于10nm，激光波长处的（100％ - 反射透射率）值大于或等于 至80％。 在处理第二表面之后，在半导体衬底的第二表面上形成金属层。 用激光照射金属层，从而在第二表面上形成欧姆电极。

    'Tape Drive Velocity Control'
    7.
    发明申请
    'Tape Drive Velocity Control' 失效
    “磁带驱动器速度控制”

    公开(公告)号：US20120019953A1

    公开(公告)日：2012-01-26

    申请号：US12842938

    申请日：2010-07-23

    申请人： Nhan Xuan Bui ,  Reed Alan Hancock ,  Randy Clark Inch ,  Shuhei Nadehara ,  Eiji Ogura ,  Kazuhiro Tsuruta

    发明人： Nhan Xuan Bui ,  Reed Alan Hancock ,  Randy Clark Inch ,  Shuhei Nadehara ,  Eiji Ogura ,  Kazuhiro Tsuruta

    IPC分类号： G11B19/02

    CPC分类号： G11B15/32 ,  G11B15/46 ,  G11B15/52

    摘要： In accordance with the present invention, a method of operating a magnetic tape drive, a magnetic tape drive and a servo control system are provided for obtaining and maintaining velocity control in a magnetic tape drive. In one embodiment, a method is provided for operating a magnetic tape drive. The tape drive includes a plurality of DC motors, and each DC motor has a plurality of Hall sensors. The DC motors are under the control of a servo system which is configured to read location information from the magnetic tape, and compute a primary tape velocity from the location information, and sense a secondary and tertiary velocity signal and compute a tape velocity based on one of the sensed secondary velocity signal and tertiary velocity. The method includes detecting if the primary velocity location information is available. In response to detecting that the primary velocity location information is available the primary velocity is employed to control the servo system. In response to detecting the primary velocity location information is unavailable then one of a secondary or a tertiary velocity signal is employed. The secondary velocity signal is employed when an absolute value of a term related to tape velocity is less than a predetermined value. The tertiary velocity signal is employed when the absolute value of the term related to tape velocity is greater than the predetermined value.

    摘要翻译： 根据本发明，提供了一种操作磁带驱动器，磁带驱动器和伺服控制系统的方法，用于获得和维持磁带驱动器中的速度控制。 在一个实施例中，提供了一种用于操作磁带驱动器的方法。 磁带驱动器包括多个DC电动机，并且每个DC电动机具有多个霍尔传感器。 直流电动机处于伺服系统的控制之下，伺服系统被配置为从磁带读取位置信息，并从位置信息计算主带速度，并感测二次和三次速度信号，并基于一个速度信号计算磁带速度 的感测二次速度信号和三次速度。 该方法包括检测主速度位置信息是否可用。 响应于检测到主速度位置信息可用，主速度被用于控制伺服系统。 响应于检测到主速度位置信息不可用，则采用次速或三速信号中的一个。 当与磁带速度相关的项的绝对值小于预定值时，采用二次速度信号。 当与磁带速度相关的项的绝对值大于预定值时，采用三次速度信号。

    Servomechanism with adjustable predictor filter
    8.
    发明授权
    Servomechanism with adjustable predictor filter 有权

    公开(公告)号：US08094407B2

    公开(公告)日：2012-01-10

    申请号：US12543339

    申请日：2009-08-18

    申请人： Giovanni Cherubini ,  Jens Jelitto ,  Kazuhiro Tsuruta

    发明人： Giovanni Cherubini ,  Jens Jelitto ,  Kazuhiro Tsuruta

    IPC分类号： G11B5/584 ,  G11B15/46

    CPC分类号： G11B5/584

    摘要： A digital control system, and in particular a tape drive system having a track-following servomechanism with a predictor (also referred to herein as a predictor filter), is described. In certain embodiments, the servomechanism includes an actuator, a servo channel, and a predictor coupled to the servo channel. The predictor receives from the servo channel a lateral position estimate signal and determines a modified lateral position estimate signal that reduces a difference, introduced by a tape velocity-dependent delay, e.g., introduced by the servo channel, between the modified lateral position estimate signal and an actual lateral position. The modified lateral position estimate may be used to modify a control signal sent to the actuator.

    Apparatus and method to decode linear position information encoded in a sequential information storage medium
    9.
    发明授权
    Apparatus and method to decode linear position information encoded in a sequential information storage medium 失效
    解码在顺序信息存储介质中编码的线性位置信息的装置和方法

    公开(公告)号：US07990644B2

    公开(公告)日：2011-08-02

    申请号：US12040606

    申请日：2008-02-29

    申请人： Nhan Xuan Bui ,  Robert Allen Hutchins, III ,  Malanie Jean Sandberg ,  Kazuhiro Tsuruta

    发明人： Nhan Xuan Bui ,  Robert Allen Hutchins, III ,  Malanie Jean Sandberg ,  Kazuhiro Tsuruta

    IPC分类号： G11B5/09 ,  G11B5/584

    CPC分类号： G11B5/584 ,  G11B20/12 ,  G11B2020/1282

    摘要： A method to decode linear position (“LPOS”) information encoded in a sequential information storage medium, by detecting each of one or a plurality of sequential first LPOS servo patterns encoded in a first servo band using a first servo sensor in communication with a first servo channel. While detecting that one or a plurality of first LPOS servo patterns, the method fails to detect (n) second LPOS servo patterns encoded in a second servo band. The method determines a value for (n), and then syncs the first servo channel with the second servo channel using that value of (n).

    摘要翻译： 一种通过使用第一伺服传感器检测在第一伺服频带中编码的一个或多个连续的第一LPOS伺服模式中的每一个解码在顺序信息存储介质中编码的线性位置（“LPOS”）信息的方法，所述第一伺服传感器与第一 伺服通道。 在检测到一个或多个第一LPOS伺服模式的同时，该方法不能检测（n）在第二伺服带中编码的第二LPOS伺服模式。 该方法确定（n）的值，然后使用该值（n）与第二伺服信道同步第一伺服信道。

    Servo band identification and initial skew estimation in drives having flangeless rollers and systems thereof
    10.
    发明授权
    Servo band identification and initial skew estimation in drives having flangeless rollers and systems thereof 有权
    具有无法兰滚子及其系统的驱动器中的伺服带识别和初始偏移估计

    公开(公告)号：US07961421B1

    公开(公告)日：2011-06-14

    申请号：US12716192

    申请日：2010-03-02

    申请人： Nhan X. Bui ,  Giovanni Cherubini ,  Jens Jelitto ,  Kazuhiro Tsuruta

    发明人： Nhan X. Bui ,  Giovanni Cherubini ,  Jens Jelitto ,  Kazuhiro Tsuruta

    IPC分类号： G11B5/58

    CPC分类号： G11B5/584

    摘要： According to one embodiment, a system includes a plurality of synchronous servo channels with each synchronous servo channel including a servo reader included in a magnetic head, and logic for applying a plurality of first control signals to a skew-following loop. Each first control signal includes a reference shift value, each reference shift value corresponds to one of a number of hypotheses, and each hypothesis corresponds to one servo band set. The system also includes logic for computing an average difference between lateral position estimates from the plurality of synchronous servo channels, logic for selecting a hypothesis from the number of hypotheses that corresponds to a maximum of the computed average difference, and logic for applying a second control signal to the skew-following loop. The second control signal includes a reference shift value that corresponds to the selected hypothesis. Other systems and methods are also described.

    摘要翻译： 根据一个实施例，一种系统包括多个同步伺服通道，每个同步伺服通道包括包含在磁头中的伺服读取器，以及用于将多个第一控制信号施加到偏斜跟随环路的逻辑。 每个第一控制信号包括参考移位值，每个参考移位值对应于多个假设中的一个，并且每个假设对应于一个伺服带组。 该系统还包括用于计算来自多个同步伺服信道的横向位置估计之间的平均差异的逻辑，用于从对应于所计算的平均差的最大值的假设的数量中选择假设的逻辑，以及用于应用第二控制 信号到偏斜跟随环路。 第二控制信号包括对应于所选假设的参考移位值。 还描述了其它系统和方法。