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：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：US5535069A

公开(公告)日：1996-07-09

申请号：US459094

申请日：1995-06-02

申请人： James Chiao ,  Jimmy D. Godwin ,  Alton B. Otis, Jr. ,  Andrew M. Rose ,  Roger O. Williams ,  Stephen P. Williams ,  Mark E. Strysko

发明人： James Chiao ,  Jimmy D. Godwin ,  Alton B. Otis, Jr. ,  Andrew M. Rose ,  Roger O. Williams ,  Stephen P. Williams ,  Mark E. Strysko

IPC分类号： G11B5/596 ,  G11B20/12 ,  G11B20/18 ,  G11B21/10 ,  G11B27/30 ,  G11B27/32 ,  G11B5/82

CPC分类号： G11B20/1866 ,  G11B20/1252 ,  G11B27/3027 ,  G11B27/329 ,  G11B5/59677 ,  G11B2020/1087 ,  G11B2220/2512

摘要： A diskette comprising a jacket, a liner material disposed within said jacket, a flat circular media having a magnetic coating on both sides disposed within said liner material, a hub attached at the center of said media, a plurality of servo grooves on at least one of said sides of said media that have stitched patterns that will alternate on-and-off at twenty kilohertz in the presence of a constant, unmodulated light source. The diskette is magnetically formatted with reference and data tracks recorded in such a way that extremely accurate position determinations can be made by looking at the analog amplitude of the detected tracks and comparing them at different head positions. The innermost tracks contain redundant copies of a disk mapping table that comprises data for a media type code, a sector size code, a sector interleave code, a total track count, a reassignment area starting address, a data area starting address, a total sector count, an update count, and a reassignment table having at least room for 250 entries of three bytes each.

摘要翻译： 一种软盘，包括夹套，设置在所述护套中的衬垫材料，平坦的圆形介质，其两侧上设置有磁性涂层，设置在所述衬垫材料内;安装在所述介质中心的毂;至少一个 所述介质的所述侧面，在存在恒定的未调制的光源的情况下，其缝合图案将在二十千赫兹交替地开启和关闭。 磁盘被磁格式化，其参考和数据轨迹以这样的方式记录，即通过观察检测到的轨迹的模拟幅度并在不同的头部位置进行比较，可以进行非常精确的位置确定。 最内侧的轨道包含盘映射表的冗余副本，该盘映射表包括用于媒体类型码，扇区大小码，扇区交织码，总轨迹数，数据区起始地址，数据区起始地址，总扇区 计数，更新计数和重新分配表，其具有至少有250个条目的空间，每个条目为三个字节。

公开(公告)号：US5220476A

公开(公告)日：1993-06-15

申请号：US608338

申请日：1990-11-02

申请人： Jimmy D. Godwin ,  Roger O. Williams ,  Stephen P. Williams

发明人： Jimmy D. Godwin ,  Roger O. Williams ,  Stephen P. Williams

IPC分类号： G11B5/012 ,  G11B5/82 ,  G11B23/40 ,  G11B33/10

CPC分类号： G11B33/10 ,  G11B23/40 ,  G11B5/012 ,  G11B5/82

摘要： A method for inscribing data onto a magnetic medium (12) wherein portions of an oxide coating (16) of the medium are removed from the medium (12) to create voids (88) while the oxide coating (16) is left undisturbed on areas adjacent to the voids (88). The adjacent areas are then uniformly magnetized. When the medium is moved past a read head (78), changes in magnetic field present at transition points (82) and (84) between the voids (88) and the uniformly magnetized oxide coating (16) of adjacent areas cause a current to be induced in a coil (80) of the read (78) head which current is interpreted by conventional read circuitry as being a data bit. The data inscribed by this method is not erasable by conventional means. The inventive method may be practiced upon selected portions of a medium (12) such that non-erasable data areas and conventional magnetically erasable data areas can coexist on the same medium (12).

摘要翻译： 一种用于将数据写入磁介质（12）的方法，其中介质的氧化物涂层（16）的部分从介质（12）中移除以产生空隙（88），同时氧化物涂层（16）不受干扰地区 邻近空隙（88）。 然后相邻区域被均匀地磁化。 当介质移动通过读取头（78）时，存在于空隙（88）和相邻区域的均匀磁化的氧化物涂层（16）之间的过渡点（82）和（84）处的磁场的变化导致电流 在读取（78）磁头的线圈（80）中被感应，该电流由常规读取电路解释为数据位。 通过这种方法刻录的数据不能通过常规方法进行擦除。 可以在介质（12）的选定部分上实施本发明的方法，使得不可擦除的数据区域和常规的磁性可擦除数据区域可以在同一介质（12）上共存。

公开(公告)号：US4935835A

公开(公告)日：1990-06-19

申请号：US269779

申请日：1988-11-10

申请人： Jimmy D. Godwin ,  Roger O. Williams ,  Stephen P. Williams ,  Alton B. Otis, Jr.

发明人： Jimmy D. Godwin ,  Roger O. Williams ,  Stephen P. Williams ,  Alton B. Otis, Jr.

IPC分类号： G11B5/596 ,  G11B21/08 ,  G11B21/10

CPC分类号： G11B5/59677 ,  G11B21/083

摘要： A magnetic medium including a physical reference feature for conveying positional information to a magnetic read/write head. The reference feature is made by indelibly marking a pattern on a surface of the medium such as by inscribing the metal oxide coating on the medium surface or by chemical etching or photolithography of the surface. Magnetic data is written on the surface of the medium and when data written on the reference feature is read, a modulated read back signal is observed which indicates the position of the reference feature. The position of the reference feature is used to direct the read/write head to track zero or to some other position on the medium surface. By using a second magnetic read/write head to write data on a second surface of the medium in response to the modulated readback signal, an electronic reference track can be written on the second surface for providing positional information to the second magnetic read/write head.

公开(公告)号：US5877910A

公开(公告)日：1999-03-02

申请号：US253618

申请日：1994-06-03

申请人： Roger O. Williams ,  Jimmy D. Godwin ,  Stephen P. Williams ,  Mark E. Strysko ,  Alton B. Otis, Jr. ,  Andrew M. Rose

发明人： Roger O. Williams ,  Jimmy D. Godwin ,  Stephen P. Williams ,  Mark E. Strysko ,  Alton B. Otis, Jr. ,  Andrew M. Rose

IPC分类号： G11B5/09 ,  G11B5/012 ,  G11B5/29 ,  G11B5/48 ,  G11B5/55 ,  G11B5/596 ,  G11B5/60 ,  G11B5/82 ,  G11B13/04 ,  G11B21/10

CPC分类号： G11B5/5534 ,  G11B5/012 ,  G11B5/4886 ,  G11B5/59633 ,  G11B5/59677

摘要： A dual magnetic head having a first magnetic core for reading and writing very high track density floppy disks and a second magnetic core for reading and writing conventional track density floppy disks. Neither the first nor the second magnetic cores require the trim erase elements associated with prior art magnetic cores for use with floppy disks. When writing on conventional track density floppy disks, separation between data tracks is achieved by erasing a circular region on a first rotation of the floppy disk, erasing a second region, separated from the first region by a small gap, on a second rotation of the floppy disk, and writing data during a third rotation of the floppy disk centered about the small gap. With very high density floppy disks, data is written directly between optical servo tracks on the floppy disk without use of the two erase steps.

摘要翻译： 具有用于读取和写入非常高的轨道密度软盘的第一磁芯的双磁头和用于读取和写入常规轨道密度软盘的第二磁芯。 第一和第二磁芯都不需要与用于软盘的现有技术磁芯相关联的修整擦除元件。 当在常规磁道密度软盘上写入时，通过在软盘的第一次旋转上擦除圆形区域来实现数据磁道之间的间隔，在第二旋转的第二旋转上擦除与第一区域分离一小间隙的第二区域 在软盘的第三次旋转期间以小间隙为中心写入数据。 使用非常高密度的软盘，数据直接写在软盘上的光学伺服磁道之间，无需使用两个擦除步骤。

公开(公告)号：US5120927A

公开(公告)日：1992-06-09

申请号：US537081

申请日：1990-06-12

申请人： Roger O. Williams ,  Milton C. Kurtz ,  Jimmy D. Godwin ,  Stephen P. Williams ,  Gregory K. Roberts

发明人： Roger O. Williams ,  Milton C. Kurtz ,  Jimmy D. Godwin ,  Stephen P. Williams ,  Gregory K. Roberts

IPC分类号： G11B5/58 ,  G11B5/584 ,  G11B5/596 ,  G11B5/82

CPC分类号： G11B5/82 ,  G11B5/58 ,  G11B5/584 ,  G11B5/59677

摘要： A magnetic information storage medium, such as a floppy or rigid magnetic disk, and an apparatus and method for inscribing a plurality of indelible grooves in a surface of the medium to function as optical servo tracks. The grooves can be in the form of a plurality of continuous or noncontinuous concentric circles. The grooves can also be a continuous spiral or a plurality of continuous concentric circles having non-constant widths and/or depths. The apparatus comprises a platen and drive motor for rotating the medium, an argon ion laser light source for generating a beam of light, optical components for directing the beam of light to a beam focusing carriage and a microcomputer for controlling the apparatus. The method involves rotating the medium under the focused light beam to inscribe the grooves on the surface of the medium. Optical track densities greater than 1000 tracks per inch can be obtained with the method.

摘要翻译： 诸如软盘或刚性磁盘的磁信息存储介质以及用于在介质的表面中刻录多个不可磨损的凹槽以用作光伺服轨道的装置和方法。 凹槽可以是多个连续的或非连续的同心圆的形式。 凹槽也可以是具有不均匀宽度和/或深度的连续螺旋或多个连续的同心圆。 该装置包括用于旋转介质的压板和驱动马达，用于产生光束的氩离子激光光源，用于将光束引导到光束聚焦托架的光学部件和用于控制该装置的微型计算机。 该方法包括在聚焦光束下旋转介质以将凹槽刻在介质的表面上。 使用该方法可以获得每英寸大于1000个轨道的光学轨道密度。

公开(公告)号：US5515212A

公开(公告)日：1996-05-07

申请号：US111778

申请日：1993-08-25

申请人： James Chiao ,  Jimmy D. Godwin ,  Alton B. Otis, Jr. ,  Andrew M. Rose ,  Roger O. Williams ,  Stephen P. Williams ,  Mark E. Strysko

发明人： James Chiao ,  Jimmy D. Godwin ,  Alton B. Otis, Jr. ,  Andrew M. Rose ,  Roger O. Williams ,  Stephen P. Williams ,  Mark E. Strysko

IPC分类号： G11B5/596 ,  G11B20/12 ,  G11B20/18 ,  G11B21/10 ,  G11B27/30 ,  G11B27/32

CPC分类号： G11B20/1866 ,  G11B20/1252 ,  G11B27/3027 ,  G11B27/329 ,  G11B5/59677 ,  G11B2020/1087 ,  G11B2220/2512

摘要： A diskette comprising a jacket, a liner material disposed within said jacket, a flat circular media having a magnetic coating on both sides disposed within said liner material, a hub attached at the center of said media, a plurality of servo grooves on at least one of said sides of said media that have stitched patterns that will alternate on-and-off at twenty kilohertz in the presence of a constant, unmodulated light source. The diskette is magnetically formatted with reference and data tracks recorded in such a way that extremely accurate position determinations can be made by looking at the analog amplitude of the detected tracks and comparing them at different head positions. The innermost tracks contain redundant copies of a disk mapping table that comprises data for a media type code, a sector size code, a sector interleave code, a total track count, a reassignment area starting address, a data area starting address, a total sector count, an update count, and a reassignment table having at least room for 250 entries of three bytes each.

摘要翻译： 一种软盘，包括夹套，设置在所述护套中的衬垫材料，平坦的圆形介质，其两侧上设置有磁性涂层，设置在所述衬垫材料内;安装在所述介质中心的毂;至少一个 所述介质的所述侧面，在存在恒定的未调制的光源的情况下，其缝合图案将在二十千赫兹交替地开启和关闭。 磁盘被磁格式化，其参考和数据轨迹以这样的方式记录，即通过观察检测到的轨迹的模拟幅度并在不同的头部位置进行比较，可以进行非常精确的位置确定。 最内侧的轨道包含盘映射表的冗余副本，该盘映射表包括用于媒体类型码，扇区大小码，扇区交织码，总轨迹数，数据区起始地址，数据区起始地址，总扇区 计数，更新计数和重新分配表，其具有至少有250个条目的空间，每个条目为三个字节。

公开(公告)号：US4961123A

公开(公告)日：1990-10-02

申请号：US202719

申请日：1988-06-03

申请人： Roger O. Williams ,  Milton C. Kurtz ,  Jimmy D. Godwin ,  Stephen P. Williams ,  Gregory K. Roberts

发明人： Roger O. Williams ,  Milton C. Kurtz ,  Jimmy D. Godwin ,  Stephen P. Williams ,  Gregory K. Roberts

IPC分类号： G11B5/58 ,  G11B5/584 ,  G11B5/596 ,  G11B5/82 ,  G11B21/10

CPC分类号： G11B5/82 ,  G11B5/58 ,  G11B5/584 ,  G11B5/59677

摘要： A magnetic information storage medium, such as a floppy or rigid magnetic disk having a plurality of indelible grooves inscribed on a surface of the medium to function as optical servo tracks. The grooves can be in the form of a plurality of continuous or noncontinuous concentric circles. The grooves can also be a continuous spiral or a plurality of continuous concentric circles having non-constant widths and/or depths.

公开(公告)号：US4638470A

公开(公告)日：1987-01-20

申请号：US608581

申请日：1984-05-09

申请人： G. A. Neville Connell ,  Jimmy D. Godwin

发明人： G. A. Neville Connell ,  Jimmy D. Godwin

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B11/00

CPC分类号： G11B11/10532

摘要： A system for providing a read signal from a magneto-optic medium wherein a non-rotated leaky beam splitter is utilized to provide both s and p components of the light reflected from the medium to a differential detector arrangement. The beam splitter, which may be of conventional construction and which has the reflected beam striking its medium-facing face at normal incidence, is operated in a leaky mode by utilizing it with a read beam having a wavelength differing from the wavelength for which the beam splitter was designed. One face of the beam splitter can be cut at a small angle off normal to prevent any p-polarized light from entering the differential detector arrangement directly from the light source.

摘要翻译： 一种用于从磁光介质提供读取信号的系统，其中使用非旋转泄漏分束器来提供从介质反射到差分检测器装置的光的s和p分量。 可以是常规结构并且具有在正常入射时入射到其面向中心面的反射光束的分束器通过利用具有波长不同于波长的波长的读取光束而以泄漏模式操作 分离器设计。 分束器的一个面可以以正常的小角度切割，以防止任何p偏振光直接从光源进入差分检测器装置。