公开(公告)号：US5162158A

公开(公告)日：1992-11-10

申请号：US383441

申请日：1989-07-24

申请人： Jodie A. Christner ,  Rajiv Ranjan

发明人： Jodie A. Christner ,  Rajiv Ranjan

IPC分类号： G11B5/66 ,  G11B5/64 ,  G11B5/65 ,  G11B5/706 ,  G11B5/73 ,  G11B5/738 ,  G11B5/82 ,  G11B5/85 ,  G11B5/851

CPC分类号： G11B5/7325 ,  Y10T428/12465 ,  Y10T428/1275 ,  Y10T428/12854 ,  Y10T428/12861

摘要： A magnetic thin film recording medium is provided for longitudinal recording of magnetic flux transitions, with the read-back signals enhanced due to a substantial reduction in media noise. The reduced noise level is the result of a unique vacuum deposition process for applying an underlayer to a substrate, prior to deposition of the magnetic thin film. In particular, the underlayer is deposited in a low temperature plasma process under increased pressure of argon or another inert gas and at reduced deposition rates, thus to create voids or interstitial areas which substantially isolate individual grains from their neighboring grains. The subsequently deposited magnetic thin film replicates the crystalline structure and orientation of the chromium underlayer, for relatively isolated grains in the recording layer. This results in lower media noise levels, approaching or equalling those characteristic of particulate media.

公开(公告)号：US5093595A

公开(公告)日：1992-03-03

申请号：US693048

申请日：1991-04-29

申请人： Garry E. Korbel

发明人： Garry E. Korbel

IPC分类号： G11B19/20 ,  H02K1/27 ,  H02K21/22

CPC分类号： G11B19/2009 ,  H02K1/2786 ,  H02K21/22

摘要： A disc drive includes a stationary frame and vertical spindle shaft, and a hub rotatable relative to the spindle shaft and supporting one or more magnetic discs. A motor for rotating the hub includes an annular stator integrally secured to the spindle shaft, and a rotor assembly integral with the hub. The rotor assembly includes an annular magnet and an annular back iron, with the magnet being spaced apart from the stator to define an air gap. The magnet includes four longitudinally disposed arcuate poles of equal size, separated from one another by flux gaps. Each of the poles has a medial region and first and second end regions on opposite sides of the medial region. The medial region is selectively magnetized to a level less than the level to which the end regions are magnetized, creating a flux gap and torque profile for the magnet particularly effective in reducing torque ripple.

摘要翻译： 盘驱动器包括固定框架和垂直主轴，以及可相对于主轴转动并支撑一个或多个磁盘的轮毂。 用于旋转轮毂的电动机包括一体地固定到主轴的环形定子和与轮毂一体的转子组件。 转子组件包括环形磁体和环形后铁，其中磁体与定子间隔开以限定气隙。 磁体包括四个相同大小的纵向设置的弧形极，通过磁通间隙彼此分离。 每个极具有在中间区域的相对侧上的中间区域和第一和第二端区域。 内侧区域被选择性地磁化到低于末端区域被磁化的水平的水平，产生用于磁体的通量隙和扭矩分布，在减小转矩波动方面特别有效。

公开(公告)号：US4982300A

公开(公告)日：1991-01-01

申请号：US282475

申请日：1988-12-09

申请人： Kent J. Forbord

发明人： Kent J. Forbord

IPC分类号： G11B33/12 ,  G11B5/48 ,  G11B21/02 ,  G11B25/04 ,  G11B33/08

CPC分类号： G11B25/043 ,  G11B33/08 ,  G11B5/4806

摘要： A magnetic disc drive includes a rigid housing, a plurality of data storage discs rotatably mounted in the housing, and a carriage for supporting and placing transducing heads in selected dispositions with respect to the rotating discs. An actuator or voice coil motor drives the carriage, and is fixed in the vertical direction to the housing by three posts extended upwardly of a deck portion of the housing and engaging the bottom of the actuator. A metallic plate mounted integrally to the actuator and a viscoelastic polymeric layer are interposed between the actuator and the deck adjacent the posts. The posts are sufficiently flexible to permit a limited horizontal displacement of the actuator with respect to the housing, responsive to movement of the carriage. The displacement causes shear strain in the viscoelastic layer whereby the layer tends to absorb and dissipate most of the energy of vibration.

公开(公告)号：US4942609A

公开(公告)日：1990-07-17

申请号：US324220

申请日：1989-03-15

申请人： Forrest C. Meyer

发明人： Forrest C. Meyer

IPC分类号： G01R31/00 ,  G11B5/60 ,  G11B5/84 ,  G11B20/10 ,  G11B21/21 ,  G11B27/36 ,  G11B33/10

CPC分类号： G11B5/6005 ,  G11B27/36 ,  G11B33/10

摘要： The integrity of a disk drive from a flyability standpoint is tested by applying a write signal of known frequency to the read/write transducer and monitoring the playback signal from the transducer. The playback signal is processed to separate a modulation component which represents air bearing disturbance.

公开(公告)号：US4912576A

公开(公告)日：1990-03-27

申请号：US284134

申请日：1988-12-14

申请人： Donald W. Janz

发明人： Donald W. Janz

IPC分类号： G11B5/596 ,  G11B21/10

CPC分类号： G11B5/59688 ,  G11B5/59638 ,  G11B5/59655

摘要： Servo data, distinguishable by phase, are stored in concentric servo tracks on a magnetic information storage disk. Each servo track includes a plurality of one type of servo pattern, with consecutive tracks arranged in a repeating sequence of the servo pattern types. For phase recognition, the pattern types further are arranged in a repeating sequence of angular sectors, each sector having a plurality of servo patterns. The servo patterns in a given storage track thus are always angularly offset from the servo patterns in the tracks adjacent thereto, permitting the use of servo patterns radially dimensioned to be greater than the separation distance between adjacent tracks, thereby increasing servo signal reliability and transducer dynamic range.

摘要翻译： 通过相位可区分的伺服数据存储在磁信息存储盘上的同心伺服磁道中。 每个伺服轨道包括多个一种类型的伺服模式，连续轨道以伺服模式类型的重复序列排列。 对于相位识别，图案类型进一步被布置成角度扇区的重复序列，每个扇区具有多个伺服模式。 因此，给定存储轨道中的伺服模式总是与相邻的轨道中的伺服模式成角度地偏移，允许使用径向尺寸的伺服模式大于相邻轨道之间的间隔距离，从而增加伺服信号的可靠性和换能器动态 范围。

公开(公告)号：US4908715A

公开(公告)日：1990-03-13

申请号：US174702

申请日：1988-03-29

申请人： Richard G. Krum ,  Neil E. Bucknam

发明人： Richard G. Krum ,  Neil E. Bucknam

IPC分类号： G11B33/08 ,  G11B33/12

CPC分类号： G11B33/122 ,  G11B33/08

摘要： An improved disk drive unit is provided for use in microcomputers such as personal computers and the like. The disk drive unit includes a substantially sealed disk drive housing and related circuit board with drive electronics carries by a common rigid chassis. A power connector plug is securely mounted onto the chassis at a rear margin thereof and cooperates with one or more interface connectors to permit simple slide fit installation of the disk drive unit into a computer system cabinet, such as a central processor unit for a computer. In addition, the disk drive unit includes improved shock mounts for supporting the sealed disk drive housing from the rigid chassis. The disk drive unit further includes a floating bushing arrangement for interconnecting the circuit board to the disk drive housing in a manner substantially isolating thermal expansion characteristics of the circuit board from the remainder of the disk drive unit.

公开(公告)号：US4897749A

公开(公告)日：1990-01-30

申请号：US168820

申请日：1988-03-16

申请人： Craig M. Perlov ,  Peter K. George ,  Mark Jursich

发明人： Craig M. Perlov ,  Peter K. George ,  Mark Jursich

IPC分类号： G11B5/127

CPC分类号： G11B5/1278

摘要： A vertically recording write probe and read ring head. A ring pole is mounted adjacent a vertical recording probe pole. The ring pole tip is made thin such that it saturates on write and does not affect performance of the probe pole. The ring pole tip is separated from the probe tip by a small read gap. The probe pole and ring pole are connected in a back gap region so that the combination reads like a conventional read head.

摘要翻译： 垂直记录写入探头和读环形头。 环形极安装在垂直记录探针杆附近。 环形电极尖端薄，使其在写入时饱和，不影响探针杆的性能。 环形极尖与探针尖端分开一个小的读取间隙。 探针杆和环形极连接在后隙区域，使得组合读取像传统读头。

公开(公告)号：US4875118A

公开(公告)日：1989-10-17

申请号：US176968

申请日：1988-04-04

申请人： Farid Kaymaram

发明人： Farid Kaymaram

IPC分类号： G11B17/02

CPC分类号： G11B17/02

摘要： Runout in a rigid magnetic disk is reduced by sandwiching a sized shim between the disk and disk support to form a substantially smooth sinusoidal circumferential profile to the disk. A method of determining shim size is also described, employing test disks for determining optimal shim size for each class of rigid disk.

摘要翻译： 通过将大小的垫片夹在盘和盘支撑件之间来形成刚性磁盘中的跳动，以形成到盘的基本平滑的正弦圆周轮廓。 还描述了确定垫片尺寸的方法，使用测试盘来确定每类刚性盘的最佳垫片尺寸。

公开(公告)号：US4868695A

公开(公告)日：1989-09-19

申请号：US175448

申请日：1988-03-30

申请人： Robert A. Quatro ,  Lawrence A. Wilcox

发明人： Robert A. Quatro ,  Lawrence A. Wilcox

IPC分类号： G11B21/22

CPC分类号： G11B21/22

摘要： A head/arm lock mechanism includes a pawl mounted to the armature of a bistable solenoid, the armature being stable in either of two rotary positions. The armature and pawl are limited to move through an angle less than that defined by the stable positions of the armature, so that the armature is biased by the magnetic circuit of the solenoid to one or the other limit positions. When the head/arm is in position to be locked, the solenoid is energized to lock against a spacer on the head/arm and the magnetic circuit continues to hold the pawl in a lock-engaging position upon de-energization of the solenoid. When the head/arm is to be unlocked, the solenoid is again energized to unlock the pawl from the spacer and the magnetic circuit continues to hold the pawl in an unlock position upon de-energization of the solenoid.

公开(公告)号：US4864434A

公开(公告)日：1989-09-05

申请号：US275854

申请日：1988-11-25

申请人： Donald W. Janz

发明人： Donald W. Janz

IPC分类号： G11B5/596 ,  G11B21/10 ,  G11B5/02

CPC分类号： G11B5/59688 ,  G11B5/59638 ,  G11B5/59655

摘要： Servo data, including three types of servo patterns distinguishable by phase, are stored in concentric servo tracks on a magnetic information storage disk. Each servo track includes a plurality of only one type of pattern, with consecutive tracks arranged in a repeating sequence of the three servo pattern types. For phase recognition, the pattern types further are arranged in a repeating sequence of angular sectors, each sector having a plurality of but one type of pattern. The servo patterns in a given storage track thus are always angularly offset from the servo patterns in the next adjacent tracks. This permits the use of servo patterns having a radial dimension greater than the separation between adjacent tracks, increasing servo signal reliability and transducer dynamic range.

摘要翻译： 伺服数据，包括可通过相位区分的三种类型的伺服模式，存储在磁信息存储盘上的同心伺服磁道中。 每个伺服轨道包括多个仅一种类型的模式，其中连续轨道以三个伺服模式类型的重复序列排列。 对于相位识别，图案类型进一步被布置成角度扇区的重复序列，每个扇区具有多个但是一种类型的图案。 因此，给定存储轨道中的伺服模式总是与下一个相邻轨道中的伺服模式成角度地偏移。 这允许使用具有大于相邻轨道之间的间隔的径向尺寸的伺服图案，增加伺服信号可靠性和换能器动态范围。