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1. 发明授权

US5471176A Glitchless frequency-adjustable ring oscillator 失效
标题翻译：无毛刺频率可调环形振荡器
公开(公告)号：US5471176A
公开(公告)日：1995-11-28
申请号：US255162
申请日：1994-06-07
申请人： James A. Henson , Scott E. Richmond , William R. Akin, Jr.
发明人： James A. Henson , Scott E. Richmond , William R. Akin, Jr.
IPC分类号： H03K3/02 , G06F1/08 , H03K3/03 , H03K3/78 , H03L7/06 , H04L7/00 , H04L7/033 , H03L7/00
CPC分类号： G06F1/08 , H03K3/0315 , H04L7/0083 , H04L7/0337
摘要： A clock generation circuit includes a reference clock for putting out a stable reference clocking signal. A digital ring oscillator includes a series circuit loop having at least one inverting gate and a programmable delay line of plural delays formed a series of tapped digital transmission gates connected between an output and an input of the inverting gate. A multiplexer selects among the series of taps in accordance with a tap selection signal. A clock monitoring circuit is connected to compare the clock output with a stable reference clocking signal to produce a digital clock cycle count. A programmed microcontroller generates the tap selection value as a function of the digital clock cycle count and a desired clock output frequency set point. And, a synchronization circuit synchronizes tap selection value applied to the multiplexer in relation to the present, adjustable clocking signal, and to a logical state of a successor, adjustable clocking signal to be put out by the digital ring oscillator following the tap selection, in order to avoid glitches and without interrupting oscillation.
摘要翻译：时钟生成电路包括用于输出稳定的参考时钟信号的参考时钟。数字环形振荡器包括串联电路回路，其具有至少一个反相门和多个延迟的可编程延迟线，形成连接在反相门的输出端和输入端之间的一系列抽头数字传输门。多路复用器根据抽头选择信号在一系列抽头之间进行选择。连接时钟监控电路，将时钟输出与稳定的参考时钟信号进行比较，以产生数字时钟周期计数。编程的微控制器根据数字时钟周期计数和期望的时钟输出频率设定点产生抽头选择值。并且，同步电路将应用于多路复用器的抽头选择值与当前可调整的时钟信号相同步，并且与随后的数字环形振荡器在抽头选择之后被放出的后继可调时钟信号的逻辑状态同步，以避免毛刺和不中断振荡。

2. 发明授权

US5862005A Synchronous detection of wide bi-phase coded servo information for disk drive 失效
公开(公告)号：US5862005A
公开(公告)日：1999-01-19
申请号：US724977
申请日：1996-10-03
申请人： Michael D. Leis , Ara Patapoutian , Mathew P. Vea , Richard M. Ehrlich , Kevin D. Fisher , James A. Henson , William R. Akin, Jr.
发明人： Michael D. Leis , Ara Patapoutian , Mathew P. Vea , Richard M. Ehrlich , Kevin D. Fisher , James A. Henson , William R. Akin, Jr.
IPC分类号： G11B20/14 , G11B5/55 , G11B5/596 , G11B20/10 , G11B20/18 , G11B21/08 , G11B21/10 , G11B27/30 , H03M13/23 , H04L25/49 , G11B5/02 , G11B5/09
CPC分类号： G11B20/10009 , G11B20/1833 , G11B21/083 , G11B27/3027 , G11B5/5526 , G11B5/59655 , G11B5/59688 , H04L25/4904 , G11B2220/20 , G11B5/59627 , G11B5/5965
摘要： A magnetic disk drive data storage disk defines recording tracks divided into data sectors by narrow servo spokes. A data sector lying between servo spokes is recorded with user data encoded in accordance with a code having a predetermined distance and user data code rate. Each servo spoke of the recording area has at least one servo information field encoded in a wide bi-phase code pattern. The disk drive further includes a synchronous sampling data detection channel having a data transducer head positioned by a servo-controlled actuator over the recording track, a preamplifier for receiving electrical analog signals magnetically induced by the data transducer head from flux transitions present in at least the servo information field, a digital sampler for synchronously sampling the electrical analog signals to produce digital samples, and wide bi-phase decoding circuitry coupled to receive digital samples from the synchronous sampling data detection channel for decoding the wide bi-phase code pattern.

3. 发明授权

US06452990B1 Synchronous detection of wide bi-phase coded servo information for disk drive 失效
标题翻译：用于磁盘驱动器的宽双相编码伺服信息的同步检测
公开(公告)号：US06452990B1
公开(公告)日：2002-09-17
申请号：US09239036
申请日：1999-01-27
申请人： Michael D. Leis , Ara Patapoutian , Mathew P. Vea , Richard M. Ehrlich , Kevin D. Fisher , James A. Henson , William R. Akin, Jr.
发明人： Michael D. Leis , Ara Patapoutian , Mathew P. Vea , Richard M. Ehrlich , Kevin D. Fisher , James A. Henson , William R. Akin, Jr.
IPC分类号： H04L702
CPC分类号： G11B20/10009 , G11B5/5526 , G11B5/59627 , G11B5/5965 , G11B5/59655 , G11B5/59688 , G11B20/1833 , G11B21/083 , G11B27/3027 , G11B2220/20 , H04L25/4904
摘要： A magnetic disk drive data storage disk defines recording tracks divided into data sectors by narrow servo spokes. A data sector lying between servo spokes is recorded with user data encoded in accordance with a code having a predetermined distance and user data code rate. Each servo spoke of the recording area has at least one servo information field encoded in a wide bi-phase code pattern. The disk drive further includes a synchronous sampling data detection channel having a data transducer head positioned by a servo-controlled actuator over the recording track, a preamplifier for receiving electrical analog signals magnetically induced by the data transducer head from flux transitions present in at least the servo information field, a digital sampler for synchronously sampling the electrical analog signals to produce digital samples, and wide bi-phase decoding circuitry coupled to receive digital samples from the synchronous sampling data detection channel for decoding the wide bi-phase code pattern.
摘要翻译：磁盘驱动器数据存储盘通过狭窄的伺服辐条来定义分割成数据扇区的记录轨道。记录位于伺服轮辐之间的数据扇区，其中用户数据根据具有预定距离的代码和用户数据代码率进行编码。记录区域的每个伺服轮辐具有编码为宽双相码模式的至少一个伺服信息场。磁盘驱动器还包括同步采样数据检测通道，其具有由伺服控制致动器在记录轨道上定位的数据传感器头，前置放大器，用于接收由数据传感器头磁场感应的电模拟信号，该电流模拟信号至少存在于伺服信息字段，用于同步采样电气模拟信号以产生数字样本的数字采样器，以及耦合以从同步采样数据检测通道接收数字样本的宽双相解码电路，用于解码宽双相码模式。

4. 发明授权

US5777760A Position feedback system for volume holographic storage media 失效
标题翻译：体积全息存储介质的位置反馈系统
公开(公告)号：US5777760A
公开(公告)日：1998-07-07
申请号：US644810
申请日：1996-05-10
申请人： Nathan J. Hays , James A. Henson , Christopher M. Carpenter , William R. Akin, Jr. , Richard M. Ehrlich , Lance D. Beazley
发明人： Nathan J. Hays , James A. Henson , Christopher M. Carpenter , William R. Akin, Jr. , Richard M. Ehrlich , Lance D. Beazley
IPC分类号： G03H1/22 , G03H1/26 , G03H1/28 , G11B7/0065 , G11C13/04 , G03H1/02 , G11B7/24
CPC分类号： G11B7/00781 , G03H1/28 , G11B7/0065
摘要： A method of holographic recording in a photorefractive medium wherein stored holograms may be retrieved with maximum signal-to noise ratio (SNR) is disclosed. A plurality of servo blocks containing position feedback information is recorded in the crystal and made non-erasable by heating the crystal. The servo blocks are recorded at specific increments, either angular or frequency, depending whether wavelength or angular multiplexing is applied, and each servo block is defined by one of five patterns. Data pages are then recorded at positions or wavelengths enabling each data page to be subsequently reconstructed with servo patterns which provide position feedback information. The method of recording data pages and servo blocks is consistent with conventional practices. In addition, the recording system also includes components (e.g. voice coil motor) which respond to position feedback information and adjust the angular position of the reference angle of a reference beam to maximize SNR by reducing crosstalk, thereby improving storage capacity.
摘要翻译：公开了一种在光折射介质中的全息记录方法，其中可以以最大信噪比（SNR）来检索存储的全息图。包含位置反馈信息的多个伺服块被记录在晶体中，并且通过加热晶体使其不可擦除。根据是否应用波长或角复用，伺服块以特定的增量（角度或频率）进行记录，并且每个伺服块由五种模式之一定义。然后在位置或波长记录数据页面，使得能够随后使用提供位置反馈信息的伺服模式来重构每个数据页面。记录数据页和伺服块的方法与传统做法一致。此外，记录系统还包括响应于位置反馈信息并调整参考光束的参考角度的角位置的组件（例如音圈电机），以通过减少串扰来最大化SNR，从而提高存储容量。

5. 发明授权

US5544135A Fault tolerant servo address mark for disk drive 失效
标题翻译：磁盘驱动器的容错伺服地址标志
公开(公告)号：US5544135A
公开(公告)日：1996-08-06
申请号：US321307
申请日：1994-10-11
申请人： William R. Akin, Jr. , Trinh C. Bui
发明人： William R. Akin, Jr. , Trinh C. Bui
IPC分类号： G11B5/596 , G11B17/22 , G11B5/09
CPC分类号： G11B5/59616
摘要： Apparatus and method for detecting occurrence of a non-pulse interval of predetermined length between a beginning pulse and an ending pulse as included within a sequence comprising a unique timing mark within a stream of pulses supplied from a source with a state machine. The method of the state machine includes the the steps of:advancing through a plurality of nominal states marking in time the non-pulse interval,branching to one of a plurality of available spurious pulse states from one of the nominal states upon detection of a first unexpected pulse,returning to advance through predetermined remaining ones of the plurality of nominal states following detection of the first unexpected pulse,reaching a completion state following the nominal states if only the first unexpected pulse is detected, andreaching an error state following a branch to another one of the plurality of available spurious pulse states upon detection of a second unexpected pulse within the non-pulse interval.
摘要翻译：检测在起始脉冲和结束脉冲之间的预定长度的非脉冲间隔的发生的装置和方法，包括在包括从具有状态机的源提供的脉冲流内的唯一定时标记的序列中。状态机的方法包括以下步骤：通过在时间上标记非脉冲间隔的多个标称状态，从一个标称状态检测多个可用的寄生脉冲状态中的一个，检测到第一检测到第一意外脉冲后返回到预定的多个标称状态中的剩余的一个，达到标称状态之后的完成状态，如果仅检测到第一意外脉冲，并且在分支到达之后达到错误状态在非脉冲间隔内检测到第二意外脉冲时，多个可用寄生脉冲状态中的另一个。

6. 发明授权

US6061200A In-drive correction of servo pattern errors 失效
标题翻译：驱动器校正伺服模式错误
公开(公告)号：US6061200A
公开(公告)日：2000-05-09
申请号：US927616
申请日：1997-09-11
申请人： Stanley H. Shepherd , Richard M. Ehrlich , James V. Wiseman , Richard T. Curran , William R. Akin, Jr.
发明人： Stanley H. Shepherd , Richard M. Ehrlich , James V. Wiseman , Richard T. Curran , William R. Akin, Jr.
IPC分类号： G11B5/596 , G11B21/10
CPC分类号： G11B5/59627 , G11B5/59638 , G11B5/59655
摘要： Embedded servo sectors within a data track of a hard disk drive including a rotating data storage disk and a closed loop rotary actuator structure for positioning a data transducer head relative to the data track are written by a method including the steps of positioning the rotary actuator structure relative to the data track with a laser-interferometer-based servo writer and writing a pattern of circumferentially sequential, radially offset fine position bursts within each servo sector with the data transducer head, this step including writing-in undetermined position errors within each pattern being written, moving the disk drive to a self scan environment away from the servo writer, operating the rotary actuator structure in closed loop for following the data track by reference to the servo burst pattern, extracting the undetermined position error from each pattern thereby to iteratively determine written-in position errors, generating burst correction values from the determined written-in position errors, and writing the burst correction values to the data track for later use by the closed loop rotary actuator structure during following of the data track to remove the written-in position errors.
摘要翻译：包括旋转数据存储盘的硬盘驱动器的数据轨道内的嵌入式伺服扇区和用于相对于数据轨道定位数据变换器头的闭环旋转致动器结构通过包括以下步骤的方法来写入：将旋转致动器结构相对于具有基于激光干涉仪的伺服写入器的数据轨迹，并且使用数据换能器头在每个伺服扇区内写入周向顺序的径向偏移的精细位置脉冲串的模式，该步骤包括在每个模式内写入未定位置误差写入，将磁盘驱动器移动到远离伺服写入器的自扫描环境，通过参考伺服脉冲串模式在闭环中操作旋转致动器结构以跟随数据轨迹，从每个图案提取未定位置误差，从而迭代地确定写入位置误差，从确定的wr产生突发校正值输入位置误差，以及将脉冲串校正值写入数据轨道，以便在跟踪数据轨道期间由闭环旋转致动器结构稍后使用以消除写入位置误差。

7. 发明授权

US5796552A Suspension with biaxially shielded conductor trace array 失效
标题翻译：悬挂双轴屏蔽导体跟踪阵列
公开(公告)号：US5796552A
公开(公告)日：1998-08-18
申请号：US785570
申请日：1997-01-21
申请人： William R. Akin, Jr. , Arun Balakrishnan , Stephen P. Williams , Christopher M. Carpenter
发明人： William R. Akin, Jr. , Arun Balakrishnan , Stephen P. Williams , Christopher M. Carpenter
IPC分类号： G11B21/21 , G11B5/39 , G11B5/48 , G11B5/60 , G11B21/16 , G11B23/00
CPC分类号： G11B5/486 , G11B21/16 , G11B5/4846 , G11B5/4853 , G11B23/0007 , G11B5/3967 , G11B5/484
摘要： A head suspension has an integrated multi-layer trace conductor array for supporting and electrically interconnecting a read/write head to electronic circuitry in a disk drive. The trace conductor array includes an integrally formed electrical shield which may be grounded or ungrounded and formed to have a depth greater than a skin effect depth at a frequency of an interfering wave front.
摘要翻译：磁头悬架具有集成的多层迹线导体阵列，用于支持并将读/写电头互连到磁盘驱动器中的电子电路。迹线导体阵列包括一体形成的电屏蔽，其可接地或不接地并形成为具有大于干扰波前频率下的皮肤效应深度的深度。

8. 发明授权

US5793559A In drive correction of servo pattern errors 失效
标题翻译：驱动器校正伺服模式错误
公开(公告)号：US5793559A
公开(公告)日：1998-08-11
申请号：US607507
申请日：1996-02-27
申请人： Stanley H. Shepherd , Richard M. Ehrlich , James V. Wiseman , Richard T. Curran , William R. Akin, Jr.
发明人： Stanley H. Shepherd , Richard M. Ehrlich , James V. Wiseman , Richard T. Curran , William R. Akin, Jr.
IPC分类号： G11B5/596 , G11B21/10
CPC分类号： G11B5/59627 , G11B5/59638 , G11B5/59655
摘要： Embedded servo sectors within a data track of a hard disk drive including a rotating data storage disk and a closed loop rotary actuator structure for positioning a data transducer head relative to the data track are written by a method including the steps of positioning the rotary actuator structure relative to the data track with a laser-interferometer-based servo writer and writing a pattern of circumferentially sequential, radially offset fine position bursts within each servo sector with the data transducer head, this step including writing-in undetermined position errors within each pattern being written, moving the disk drive to a self scan environment away from the servo writer, operating the rotary actuator structure in closed loop for following the data track by reference to the servo burst pattern, extracting the undetermined position error from each pattern thereby to iteratively determine written-in position errors, generating burst correction values from the determined written-in position errors, and writing the burst correction values to the data track for later use by the closed loop rotary actuator structure during following of the data track to remove the written-in position errors.
摘要翻译：包括旋转数据存储盘的硬盘驱动器的数据轨道内的嵌入式伺服扇区和用于相对于数据轨道定位数据变换器头的闭环旋转致动器结构通过包括以下步骤的方法来写入：将旋转致动器结构相对于具有基于激光干涉仪的伺服写入器的数据轨迹，并且使用数据换能器头在每个伺服扇区内写入周向顺序的径向偏移的精细位置脉冲串的模式，该步骤包括在每个模式内写入未定位置误差写入，将磁盘驱动器移动到远离伺服写入器的自扫描环境，通过参考伺服脉冲串模式在闭环中操作旋转致动器结构以跟随数据轨迹，从每个图案提取未定位置误差，从而迭代地确定写入位置误差，从确定的wr产生突发校正值输入位置误差，以及将脉冲串校正值写入数据轨道，以便在跟踪数据轨道期间由闭环旋转致动器结构稍后使用以消除写入位置误差。

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