公开(公告)号：US20050141123A1

公开(公告)日：2005-06-30

申请号：US11012938

申请日：2004-12-15

申请人： Maxim Roth

发明人： Maxim Roth

IPC分类号： G11B5/127 ,  G11B5/39 ,  G11B5/596 ,  G11B21/02 ,  G11B5/09

CPC分类号： G11B5/3906 ,  G11B5/1278 ,  G11B5/59633

摘要： Perpendicular recorded servo patterns are used such that a first and second servo fields can be positioned with a common border to define a desired track position.

摘要翻译： 使用垂直记录的伺服模式，使得第一和第二伺服磁场可以用公共边界定位以限定期望的磁道位置。

公开(公告)号：US5065387A

公开(公告)日：1991-11-12

申请号：US537053

申请日：1990-06-12

申请人： Maxim Roth ,  Jimmy D. Godwin ,  Roger O. Williams

发明人： Maxim Roth ,  Jimmy D. Godwin ,  Roger O. Williams

IPC分类号： G11B5/584 ,  G11B5/596

CPC分类号： G11B5/59677 ,  G11B5/584

摘要： An optical servo head and method for reading position information on a medium, such as a magnetic disk, having a plurality of optical servo tracks in the form of relatively nonreflective regions on a reflective surface of the medium. With a magnetic disk, the nonreflective regions comprise concentric grooves etched in the disk surface and the reflective regions comprise the land areas between the grooves. The optical servo head is mounted on a carriage/head assembly of a disk drive and comprises an infrared light emitting diode, a collection lens, a routing mirror and a multicell photodetector. The method of reading position information from the magnetic disk comprises the steps of illuminating the disk with the infrared diode, focusing the image of the optical tracks on the cells of the photodetector such that a linear signal will be generated as the optical tracks pass the photodetector cells, and generating a continuous output signal from the photodetector cell output which is used to control the positioning of the carriage/head assembly. The output signal can be directed through a synchronous detection circuit to improve the S/N contrast between the reflective and nonreflective areas. Additionally, the output signal can be routed to an alignment circuit comprising a pair of digital-to-analog converters, a pair of digital signal generators, an adder and an electronic filter and which electronically compensates for imprecision in the servo head - data head separation distance. Track sweeping without leaving the position loop is also accomplished through use of the alignment circuit.

摘要翻译： 一种在诸如磁盘的介质上读取位于介质的反射表面上的相对非反射区域形式的多个光学伺服磁道的位置信息的光学伺服磁头和方法。 利用磁盘，非反射区域包括蚀刻在盘表面中的同心凹槽，并且反射区域包括凹槽之间的焊盘区域。 光学伺服头安装在磁盘驱动器的滑架/磁头组件上，并包括红外发光二极管，集合透镜，路由反射镜和多单元光电检测器。 从磁盘读取位置信息的方法包括用红外二极管照亮盘的步骤，将光学轨迹的图像聚焦在光电检测器的单元上，使得当光轨通过光电检测器时将产生线性信号 并且从用于控制滑架/头组件的定位的光电检测器单元输出产生连续的输出信号。 输出信号可以被引导通过同步检测电路来改善反射区域和非反射区域之间的S / N对比度。 另外，输出信号可以路由到包括一对数模转换器，一对数字信号发生器，加法器和电子滤波器的对准电路，并且电子地补偿伺服头中的不精确性 - 数据头分离 距离。 通过使用对准电路也可以实现不离开位置环的轨道扫描。

公开(公告)号：US20090185307A1

公开(公告)日：2009-07-23

申请号：US12009853

申请日：2008-01-22

申请人： Maxim Roth

发明人： Maxim Roth

IPC分类号： G11B5/596

CPC分类号： G11B5/6023

摘要： A hard disk drive that includes a head that is coupled to a disk. The head has a flying height and an inductance. The disk drive also includes a circuit that detects a change in the flying height by sensing a change of head inductance. The circuit can inhibit a write operation if the change in inductance exceeds a threshold.

摘要翻译： 包含耦合到磁盘的磁头的硬盘驱动器。 头部具有飞行高度和电感。 磁盘驱动器还包括通过感测磁头电感的变化来检测飞行高度的变化的电路。 如果电感的变化超过阈值，电路可以抑制写操作。

公开(公告)号：US4958245A

公开(公告)日：1990-09-18

申请号：US178542

申请日：1988-04-07

申请人： Maxim Roth ,  Jimmy D. Godwin ,  Roger O. Williams

发明人： Maxim Roth ,  Jimmy D. Godwin ,  Roger O. Williams

IPC分类号： G02B7/28 ,  G05D3/12 ,  G11B5/584 ,  G11B5/596 ,  G11B5/73 ,  G11B5/735 ,  G11B5/82 ,  G11B7/09 ,  G11B13/04 ,  G11B21/10

CPC分类号： G11B5/59677 ,  G11B5/584

摘要： An optical servo head and method for reading position information on a medium, such as a magnetic disk, having a plurality of optical servo tracks in the form of relatively nonreflective regions on a reflective surface of the medium. With a magnetic disk, the nonreflective regions comprise concentric grooves etched in the disk surface and the reflective regions comprise the land areas between the grooves. The optical servo head is mounted on a carriage/head assembly of a disk drive and comprises an infrared light emitting diode, a collection lens, a routing mirror and a multicell photodetector. The method of reading position information from the magnetic disk comprises the steps of illuminating the disk with the infrared diode, focusing the image of the optical tracks on the cells of the photodetector such that a linear signal will be generated as the optical tracks pass the photodetector cells, and generating a continuous output signal from the photodetector cell output which is used to control the positioning of the carriage/head assembly. The output signal can be directed through a synchronous detection circuit to improve the S/N contrast between the reflective and nonreflective areas. Additionally, the output signal can be routed to an alignment circuit comprising a pair of digital-to-analog converters, a pair of digital signal generators, an adder and an electronic filter and which electronically compensates for imprecision in the servo head-data head separation distance. Track sweeping without leaving the position loop is also accomplished through use of the alignment circuit.

公开(公告)号：US07123434B2

公开(公告)日：2006-10-17

申请号：US11012938

申请日：2004-12-15

申请人： Maxim Roth

发明人： Maxim Roth

IPC分类号： G11B5/596 ,  G11B5/09

CPC分类号： G11B5/3906 ,  G11B5/1278 ,  G11B5/59633

摘要： Perpendicular recorded servo patterns are used such that a first and second servo fields can be positioned with a common border to define a desired track position.

摘要翻译： 使用垂直记录的伺服模式，使得第一和第二伺服磁场可以用公共边界定位以限定期望的磁道位置。

公开(公告)号：US07110209B2

公开(公告)日：2006-09-19

申请号：US11090607

申请日：2005-03-25

申请人： Richard M. Ehrlich ,  Maxim Roth ,  David Rutherford

发明人： Richard M. Ehrlich ,  Maxim Roth ,  David Rutherford

IPC分类号： G11B5/596

CPC分类号： G11B5/59655

摘要： The minor coherence-errors suffered during servowriting of bursts in a phase burst servo pattern may contribute to significant written-in runout of the resulting pattern. Embodiments of the present invention enables the servowriting of both the zig/zag bursts and/or the digital information of the phase burst pattern all in one single revolution so that the common coherence errors of the zig/zag bursts can be canceled during demodulation. Such single pass servowriting of both zig/zag bursts can be accomplished by either using additional phase-adjustment circuitry or by shifting the phase of the write clock to allow servowriting of the bursts and/or digital information all at edges of (different) integer clock cycles. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.

摘要翻译： 在相位脉冲串伺服模式中的脉冲串伺服期间遭受的次要相干误差可能导致所得图案的显着的写入跳动。 本发明的实施例使得能够在一个单圈中全部将Zig / ZAG脉冲串和/或相位脉冲串模式的数字信息进行伺服驱动，从而可以在解调期间抵消Zig / ZAG脉冲串的公共相干误差。 可以通过使用附加的相位调整电路或通过移位写入时钟的相位来实现两个ZZ / ZAG脉冲串的这种单通道伺服驱动，以允许脉冲串和/或数字信息的全部在（不同）整数时钟 周期。 本说明书不是对本发明的完整描述或限制本发明的范围。 本发明的其它特征，方面和目的可以通过对说明书，附图和权利要求的评述来获得。

公开(公告)号：US20050219759A1

公开(公告)日：2005-10-06

申请号：US10812522

申请日：2004-03-30

申请人： Maxim Roth

发明人： Maxim Roth

IPC分类号： G11B5/48

CPC分类号： G11B5/486

摘要： A storage device is configured to read and write data from one or more storage media. The storage device includes an actuator which reads and writes data. The actuator includes two or more read leads that connect to a pre-amp and run parallel to a write lead. The read leads are configured such that they cross at the middle, thus mostly canceling out the differences in induced voltage between the two read leads and reducing cross-talk.

摘要翻译： 存储设备被配置为从一个或多个存储介质读取和写入数据。 存储装置包括读取和写入数据的致动器。 致动器包括连接到前置放大器并且平行于写入引线延伸的两个或更多个读取引线。 读取引线被配置为使得它们在中间交叉，从而大大消除了两个读取引线之间的感应电压的差异并减少了串扰。

公开(公告)号：US20050219758A1

公开(公告)日：2005-10-06

申请号：US10812430

申请日：2004-03-30

申请人： Maxim Roth

发明人： Maxim Roth

IPC分类号： G11B5/48

CPC分类号： G11B5/486

摘要： A storage device is configured to read and write data from one or more storage media. The storage device includes an actuator which reads and writes data. The actuator includes two or more read leads that connect to a pre-amp and run parallel to a write lead. The read leads are configured such that they cross at the middle, thus mostly canceling out the differences in induced voltage between the two read leads and reducing cross-talk.

摘要翻译： 存储设备被配置为从一个或多个存储介质读取和写入数据。 存储装置包括读取和写入数据的致动器。 致动器包括连接到前置放大器并且平行于写入引线延伸的两个或更多个读取引线。 读取引线被配置为使得它们在中间交叉，从而大大消除了两个读取引线之间的感应电压的差异并减少了串扰。

公开(公告)号：US20060132962A1

公开(公告)日：2006-06-22

申请号：US11090607

申请日：2005-03-25

申请人： Richard Ehrlich ,  Maxim Roth ,  David Rutherford

发明人： Richard Ehrlich ,  Maxim Roth ,  David Rutherford

IPC分类号： G11B21/02 ,  G11B5/09

CPC分类号： G11B5/59655

摘要： The minor coherence-errors suffered during servowriting of bursts in a phase burst servo pattern may contribute to significant written-in runout of the resulting pattern. Embodiments of the present invention enables the servowriting of both the zig/zag bursts and/or the digital information of the phase burst pattern all in one single revolution so that the common coherence errors of the zig/zag bursts can be canceled during demodulation. Such single pass servowriting of both zig/zag bursts can be accomplished by either using additional phase-adjustment circuitry or by shifting the phase of the write clock to allow servowriting of the bursts and/or digital information all at edges of (different) integer clock cycles. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.

公开(公告)号：US20050143946A1

公开(公告)日：2005-06-30

申请号：US11013866

申请日：2004-12-16

申请人： Raghu Gururangan ,  Maxim Roth

发明人： Raghu Gururangan ,  Maxim Roth

IPC分类号： G01R27/28 ,  G11B5/09 ,  G11B5/455

CPC分类号： G11B5/455

摘要： A method of determining the write head capacity during self test of a hard disk drive is described. Information related to the dynamic coercivity of the disk service is obtained. In one embodiment, a DC erase condition is produced onto the disk surface. An AC signal is provided to a write head such that a region on the disk surface is put into a state of substantially no direction of magnetization. The AC signal to cause this state will be related to the coercive current. The coercive current can be used to estimate the required write current at low temperatures and thus determine whether to reject the hard disk drive.

摘要翻译： 描述了在硬盘驱动器的自检期间确定写入头容量的方法。 获得与磁盘服务的动态矫顽力有关的信息。 在一个实施例中，在盘表面上产生DC擦除条件。 将AC信号提供给写入头，使得盘表面上的区域基本上没有磁化方向。 导致此状态的交流信号将与矫顽电流相关。 矫顽电流可用于估计低温下所需的写入电流，从而确定是否拒绝硬盘驱动器。