88results about "Driving/moving recording heads" patented technology

A data storage device comprises a lead actuator that actuates a first read-write head over a first disk and a support actuator that actuates a second read-write head over a second disk. A spindle motor rotates the first and second disks. In response to an emergency power off (EPO) event, a processing device retracts and parks the actuators using an internal supply voltage generated from a back electromotive force (BEMF) voltage of the spindle motor, and brakes the spindle motor. The spindle motor is not braked until both the lead and support actuators have been retracted and parked.

According to one embodiment, a disk device includes two magnetic disks opposing each other at intervals of 1.2 to 1.5 mm, and at least two suspension assemblies movable respectively between the two magnetic disks. Each of the suspension assemblies includes a base plate, a load beam extending from the base plate, a tab extending from a distal end of the load beam, a wiring member on the load beam and the base plate, including a gimbal portion, and a magnetic head on the gimbal portion, abutting on a dimple of the load beam via the gimbal portion. The ratio of a distance from a bendable location of the load beam to a center of the dimple with respect to a distance from the center of the dimple to a tip of the tab is 2.8 to 3.8.

A ramp support for a magnetic storage device includes a first ramp, having a first-ramp receiving end and a first-ramp surface, and a second ramp, having a second-ramp receiving end, offset laterally from the first-ramp receiving end, and a second-ramp surface. A first first-ramp portion faces and is angled toward a virtual plane. A second first-ramp portion faces and is angled away from the virtual plane. A third first-ramp portion faces and is angled toward the virtual plane. A first second-ramp portion faces and is angled toward the virtual plane, and a second second-ramp portion faces and is angled away from the virtual plane. In the direction along the virtual plane, the first second-ramp portion extends further than the first first-ramp portion and terminates at the same location relative to the plane as the second second-ramp portion, and the third first-ramp portion extends further than the second second-ramp portion.

The disclosure relates to a voice coil motor (VCM) in a hard disk drive during a retract phase, wherein read-and-write heads of the hard disk drive are retracted by the VCM from a disk surface towards an end-of-travel parking condition with the heads climbing over a ramp starting from a ramp edge adjacent the disk surface. During the retract phase, the VCM is operated in a discontinuous mode comprising an alternation of on-times of duration TON and off-times of duration TOFF wherein supply of a drive current to the VCM is facilitated and countered, respectively. The duration TOFF of the off-times is varied to have a lower bound value at the ramp edge and to increase towards an upper bound value as the heads climb over the ramp towards the end-of-travel parking condition.

A voice coil motor (VCM) in a hard disk drive is operated in a discontinuous mode with an alternation of on and off times. A drive current to the VCM is facilitated and countered with a variable voltage across the during the on-times and off-times. The intensity of the drive current is controlled as a function of a Back ElectroMotive Force (BEMF) of the VCM. A method includes sampling during the alternation of on-times and off-times first and second values of the voltage across the VCM. The first value is sampled at a first time in response to the end of the off-time. The second value is sampled at a second time in response to the drive current of the VCM zeroing following the supply of drive current to the VCM being countered during the off-time. The BEMF is calculated as a function of first and second values.

According to one embodiment, a magnetic disk drive comprising, a magnetic disk, a magnetic head, a voice coil motor, and a controller. The controller includes a seek control section, a velocity calculation section, a back electromotive voltage estimation section, and a coil resistance estimation section.

Improve non-repetitive runout (NRRO) associated with the system's structural dynamics and operating vibrations. [Solution] A data storage device such as a hard disk drive (HDD) includes a rotary pivot bearing assembly of a rotary actuator configured with a bearing span smaller than the maximum available bearing span, thereby reducing the rotary pivot tilt (PT) gain of the corresponding acoustic transfer function relative to the rotational pivot tilt (PT) gain of the original acoustic transfer function corresponding to the maximum available bearing span. To counteract the resulting decrease in coil torsion and rotational pivot tilt frequency, the voice coil is thickened vertically to increase the coil torsion (CT) frequency and rotational pivot tilt frequency, bringing them closer to their values ​​in the original acoustic transfer function. Combining a relatively short bearing span with a relatively thick voice coil ensures and improves performance by maintaining relatively high CT and PT frequencies while guaranteeing a relatively low PT gain.

An embodiment provides a disk device capable of improving durability against thermal stress. The disk device involved in one embodiment includes a recording medium, a first magnetic head, a first wiring member, a flexible printed wiring board, and wiring. The first wiring member is electrically connected to the first magnetic head. The flexible printed wiring board has a surface, a first fixing portion fixed to a first component, and a second fixing portion fixed to a second component, and is electrically connected to the first magnetic head via the first wiring member. The wiring is arranged on the flexible printed wiring board, extends along the surface, and extends between the first fixing portion and the second fixing portion in a direction intersecting at an angle greater than 45° and less than 90° relative to the direction in which an imaginary line extends, and the imaginary line is an imaginary line connecting the first fixing portion and the second fixing portion with the shortest distance along the surface.

According to one embodiment, a head gimbal assembly (HGA) of a disk device includes a load beam. The load beam includes two side rails, a plate between the two side rails, a first plane of the plate, a lift tab protruding from an end of the plate, and a protrusion protruding from the first plane and supporting a slider. An edge of each of the two side rails has a first edge, a second edge extending from the first edge toward the lift tab, and a third edge extending from the second edge to the lift tab while being inclined with respect to the first plane so as to approach the first plane. An end of the slider is at the same position as an end of the third edge or is farther from the lift tab than the end of the third edge.

The process of assembling a voice coil motor (VCM), such as for a hard disk drive, involves creating an opening in a yoke, attaching a primary magnet to the inside surface of the yoke, installing a cross flux magnet through the opening in the yoke and into the channel of the primary magnet, and installing a plug into the opening in the yoke, thus minimizing part count and making the manufacturing process easily integrated into existing VCM manufacturing processes.

The present invention provides a head actuator and a disk device that have improved reliability by reducing crosstalk between wirings. According to an embodiment, the head actuator and the disk device include a first suspension assembly having a first wiring member and a second suspension assembly having a second wiring member. The first wiring member includes at least four first read wirings and at least four first write wirings spaced apart and arranged in parallel in the width direction of the first wiring member. The plurality of second wirings of the second wiring member include at least four second read wirings and at least four second write wirings spaced apart and arranged in parallel in the width direction of the second wiring member. The at least two first read wirings and the at least two first write wirings are arranged at positions offset in the width direction relative to the second read wirings and the second write wirings in a manner that is not opposite to the second read wirings and the second write wirings in a direction perpendicular to the surface of the first wiring member.

To provide a disk device capable of improving reliability by suppressing a failure caused by outgas.SOLUTION: According to an embodiment, a disk device includes a disk-like recording medium, an actuator assembly rotatably provided, a magnetic head supported by the actuator assembly, and a first stopper and a second stopper disposed so as to be able to abut on the actuator assembly. At least one of the first stopper and the second stopper includes a buffer member having an abutting surface capable of abutting on the actuator assembly, and a gas adsorbent provided to surround the buffer member except for the abutting surface.SELECTED DRAWING: Figure 3

A magnetic disk device and a method for writing a spiral pattern are provided that can improve reliability. The magnetic disk device of this embodiment includes: a disk having a first surface and a second surface different from the first surface; a first head for reading and writing data from and to the first surface; a second head for reading and writing data from and to the second surface; a voice coil motor for moving the first and second heads; and a controller for dividing and writing multiple spiral patterns to be written to one surface of the disk onto the first and second surfaces.

The embodiment provides a magnetic disk device capable of detecting contact between a slider and a magnetic disk. The magnetic disk device of the embodiment comprises: a plurality of magnetic disks; a plurality of sliders including resistance elements disposed so as to be exposed to the recording surfaces of the magnetic disks and disposed corresponding to the plurality of magnetic disks; and a control unit that detects changes in resistance values ​​of the resistance elements disposed on the plurality of sliders.

Provided are a method for manufacturing a magnetic disk device for efficiently recording auxiliary servo patterns and a magnetic disk device capable of efficiently recording auxiliary servo patterns. The manufacturing method includes estimating the distribution of initial values ​​of the gap of the magnetic head in the first recording surface; and recording a first spiral signal on the first recording surface while controlling the gap using the distribution of the estimated initial values ​​of the gap. The manufacturing method includes measuring the distribution of initial values ​​of the gap of the magnetic head in the second recording surface under positioning control using the first spiral signal recorded on the first recording surface. The manufacturing method includes controlling the gap using the distribution of initial values ​​of the gap of the magnetic head in the second recording surface measured, while recording the first spiral signal on the second recording surface. The manufacturing method includes recording a second spiral signal on the third recording surface under positioning control using the first spiral signal recorded on the second recording surface.

To provide a head gimbal assembly (HGA) for hard disk drives.SOLUTION: A HGA includes a carriage arm 132 with a swage processing hole, two lead suspensions 110C, and two swage plates 200 to which the two suspensions are respectively coupled. Each swage plate includes a respective series of intermittent swage bosses 206 extending from a base plate, the swage bosses of each swage plate are respectively positioned relative to each other by extending to the swage processing hole 132a from each side of the carriage arm, and each of the one series of swage bosses interposes with the other series of swage bosses. By having both series of interposed swage bosses occupy the same swage hole height, the height of each swage boss can be effectively doubled, and a higher retention torque of the swage coupling is enabled even if it is considered in a thinner arm tip and shorter corresponding swage holes.SELECTED DRAWING: Figure 2B

To provide a magnetic head and a magnetic recording device for improving recording density.SOLUTION: A magnetic head 110 includes a first magnetic pole 31 and a second magnetic pole 32, a laminate 20, and a first terminal T1 to a third terminal T3. The laminate 20 is provided between the first magnetic pole 31 and the second magnetic pole 32. The laminate body 20 includes a first magnetic layer 21 to a fourth magnetic layer 24 and a first non-magnetic layer 41 to a fifth non-magnetic layer 45. The first terminal T1 is electrically connected to the first magnetic pole 31. The second terminal T2 is electrically connected to the second magnetic pole 32. The third terminal T3 is electrically connected to the third non-magnetic layer 43.SELECTED DRAWING: Figure 1

A data storage device comprises a disk and a recording head. A thermal fly-height control (TFC) heater thermally adjusts a spacing of the recording head from a surface of the disk. A thermal proximity sensor detects a spacing of the recording head from the disk surface and generates a thermal proximity sensor signal indicative of the detected spacing. A height of smear accumulated on the recording head is determined by dithering the TFC heater about a DC power level, measuring a skewness in the thermal proximity sensor signal while the TFC heater is being dithered, and determining the smear height from the measured skewness.

This invention provides a data storage device that controls the torsional mode of a coil and reduces the power consumption of an actuator. [Solution] A voice coil motor assembly (VCMA) 400 for hard disk drives and the like includes a low-density voice coil 407 and a high-density coil reinforcement 408 positioned inside the wire coil. The low-density voice coil, utilizing copper-clad aluminum or aluminum wire, increases the second coil torsion mode frequency of the VCMA, thereby bringing it closer to the second torsion mode frequency of the actuator arm 402. In addition, the high-density reinforcement, utilizing steel, copper, or zinc, increases the mass of the VCMA with respect to the center of mass of the VCMA around the rotation axis of the VCMA, compensating for the lower-density wire. With respect to the position error signal (PES) under customer box vibration conditions, significant peaks in the PES spectrum are largely eliminated, and the power of the PES is reduced by approximately half.

To provide a ramp mechanism that can achieve high dimensional accuracy.SOLUTION: A hard disk drive device 1 includes: a recording disk 4 for recording data; a magnetic head 8 for recording or reading data on / from the recording disk 4; a swing arm 7 to which the magnetic head 8 is attached; and a ramp mechanism 9 provided at a position apart from the recording disk 4 and forming a retreating position for the magnetic head 8, wherein the swing arm 7 swings so that the magnetic head 8 moves on the recording disk 4 or the position of the ramp mechanism 9, and the ramp mechanism 9 is made of metal.SELECTED DRAWING: Figure 1

Apparatus and methods for performing charge detection mass spectrometry for measurement of the mass of a single ion of interest are disclosed. The ion of interest is caused to undergo harmonic oscillatory movement in the trapping field of an electrostatic trap, such that an image current detector generates a time-varying signal representative of the ion's oscillatory movement. This time-varying signal (transient) is processed (e.g., via a Fourier transform) to derive the ion's frequency and consequently determine the ion's mass-to-charge ratio (m / z). Ion charge is determined by construction of a Selective Temporal Overview of Resonant Ion (STORI) plot, which tracks the temporal evolution of signals attributable to the ion of interest, and where the slope of the STORI plot is related to the charge. The STORI plot may also be employed to identify ion decay events during transient acquisition and / or the presence of multiple ions of the same mass or non-resolvable ions.

The invention provides a magnetic disk device and a control method thereof capable of suppressing fluctuation of a floating amount of a magnetic head. According to the present embodiment, a magnetic disk device controls the driving of a first actuator in order to seek a magnetic head to a target position on a magnetic disk, and controls the driving of a second actuator in order to finely adjust the position of the magnetic head at the target position on the magnetic disk. The drive voltage for the second actuator is changed in stages each time at a predetermined voltage limit value. While superimposing a high-frequency signal on a drive voltage for a second actuator output from a second control unit, a fluctuation in the amount of floating of the magnetic head is detected, and the voltage limit value is set on the basis of the detection result.

A ramp support for a magnetic storage device includes a first ramp, having a first-ramp receiving end and a first-ramp surface, and a second ramp, having a second-ramp receiving end, offset laterally from the first-ramp receiving end, and a second-ramp surface. A first first-ramp portion faces and is angled toward a virtual plane. A second first-ramp portion faces and is angled away from the virtual plane. A third first-ramp portion faces and is angled toward the virtual plane. A first second-ramp portion faces and is angled toward the virtual plane, and a second second-ramp portion faces and is angled away from the virtual plane. In the direction along the virtual plane, the first second-ramp portion extends further than the first first-ramp portion and terminates at the same location relative to the plane as the second second-ramp portion, and the third first-ramp portion extends further than the second second-ramp portion.

A circuit for determining the height of a gimbal-mounted head assembly (HGA) is provided. The circuit comprises a first switch configured to be controlled by a first clock signal, an amplifier, and a first capacitor coupled to the first switch, wherein the first capacitor is formed by at least part of a gimbal suspension and a storage medium. The circuit further comprises a second capacitor connected to an input and an output of the amplifier, the second capacitor being configured to store a charge from the first capacitor over one or more cycles of the first clock signal. The amplifier is configured to generate an output voltage based at least in part on a change in the capacitance of the first capacitor over the one or more cycles of the first clock signal.

According to one embodiment, a magnetic disk drive comprising, a magnetic disk, a magnetic head, a voice coil motor, and a controller. The controller includes a seek control section, a velocity calculation section, a back electromotive voltage estimation section, and a coil resistance estimation section.

To provide an alternative to rare earth magnetic materials for use in VCM of HDD while considering cost and environmental issues.SOLUTION: In a voice coil motor (VCM), a composite magnet assembly 200 includes: a coil; a first yoke 202a having a coil side facing the coil on a first side; a first low coercivity permanent magnet 204a positioned between the coil and the coil side of the first yoke and having a yoke side facing the first yoke and a coil side facing the yoke side; and a first high coercivity permanent magnet 205a adjacent to the coil side of the first low coercivity permanent magnet. The second side of the opposite side of the coil is similarly constructed. A permeance coefficient of the VCM allows for magnetic stability of a low coercivity magnetic material, and if a relative thickness of a magnet material so dictates by design, an additional high coercivity permanent magnet is bonded to the coil side of each of the first and second yokes and adjacent to the yoke side of the low coercivity permanent magnet.SELECTED DRAWING: Figure 2A