Fujitsu Corporation

Toshiba Storage Device Corporation

Masaya Suwa

Yoshiharu Matsuda

Keiji Aruga

Keishi Shimizu

Masanori Ueda

Hisashi Kaneko

Yoshinori Ogawa

Hiroshi Nagata

A magnetic disk device includes a swing-type head actuator which is driven by a voice coil motor. The voice coil motor is cooled by an airflow generated when a magnetic disk accommodated in a disk accommodating unit of an enclosure is rotated by a spindle motor. An airflow dividing member provided on an inner wall or a base of an actuator accommodating unit divides the airflow generated by the rotation of the disk and passing along the inner wall. The divided airflow is introduced to a coil part of the voice coil motor, and cools the coil, without sacrificing the dust purge performance.

Cooling of head actuator of disk device

A first shroud and a second shroud are opposed to the peripheral end surface of a recording disk at a certain constant distance. The second shroud is spaced downstream from the first shroud in the direction of the rotation of the recording disk. A shroud plate is opposed to the peripheral end surface of the recording disk at a position between the first and second shrouds. The shroud plate functions as a shroud. The shroud plate serves to suppress turbulence of airflow. Vibration of the recording disk can be suppressed. Moreover, if the shroud plate is designed to extend along a virtual plane perpendicular to the rotation axis of the recording disk, the airflow is prevented from staying between the first and second shrouds. The airflow can effectively be taken out. The airflow can effectively be utilized.

Recording disk drive having shroud

A mold used to manufacture, through metal mold casting, a damper that is fixed onto a housing in a disc drive and reduces a vibration of the housing, the disc drive recording information in and reproducing information from a recording medium. The mold includes a sectionally concave body that defines a shape of the damper, a first gate that introduces molten metal to the body from a runner, and is provided on a first side opposite to a concave of the body, and a second gate that introduces the molten metal to an overflow well from the body, and is provided at least one of a second side perpendicular to the first side, and a third side perpendicular to the second side and parallel to the first side.

Storage

A magnetic disc apparatus has a ramp holding the magnetic head in a position apart from the magnetic disc and a filter case holding a filter in the state of being bent in such a manner that the filter surrounds the ramp together with the magnetic disc. The filter removes dust in airflow which flows in the magnetic disc apparatus accompanying the rotation of the magnetic disc.

Filtering device for a magnetic disc apparatus

First and second shroud surfaces are defined along an imaginary cylinder coaxial to a recording disk. A shroud plate is located between the first and second shroud surfaces. Airflow flows outward along the surface of the rotating recording disk based on the centrifugal force. The shroud plate serves to establish the continuity of the first and second shroud surfaces. The first and second shroud surfaces and the shroud plate serve to reliably suppress turbulence of the airflow. Vibration of the recording disk is suppressed than ever. An inflow opening is located in a space between the first and second shroud surfaces. The rectifier plate is located downstream of the inflow opening. The rectifier plate serves to direct the airflow flowing along the first shroud surface to the inflow opening. A larger amount of airflow can be introduced into the inflow opening. A dust catcher receives airflow of a sufficient amount.

A side yoke is integrally formed on a cover of magnetic material in a magnetic disk drive unit by cutting and folding a portion of the cover. When the cover is attached to a housing body of magnetic material, the cover, the side yoke and the bottom of the housing body form a yoke for voice coil motor. The magnetic flux from a magnet circulates in the yoke and serves to drive a voice coil disposed in a gap of the yoke. The integral formation of the side yoke to the cover contributes to reduction in the number of parts, and leads to a facilitated assembling and manufacturing.

Information recording apparatus with voice coil motor and cover thereof

A method and an apparatus for analyzing the vibration of the housing of a disk device are disclosed, in which the residual vibration of the housing can be accurately detected for protection against vibrations by determining the transfer function of the rotational acceleration of the housing. The vibration of the housing of the disk device attributable to a head actuator built into a computer or constituting a disk device housed in a locker is detected in such a manner that a random seek current is supplied to the head actuator from an external source, the transfer function of the rotational acceleration of the housing obtained from at least n acceleration sensor mounted on the housing is determined for each frequency, the spectrum of the random seek current supplied to the head actuator is multiplied by the transfer function of the housing, the resulting product is integrated twice thereby to convert the rotational acceleration into a displacement, the converted value of displacement thus obtained is multiplied by the servo follow-up error characteristic of the head actuator thereby to determine the power spectrum of the residual vibration in the frequency domain. The power spectrum is subjected to an inverse Fourier transformation thereby to detect the oscillation of the head with respect to time.

Method and apparatus for analyzing vibration of housing of disk device

An actuator assembly for a magnetic disk drive having a structure capable of easily removing the imbalance of the actuator assembly. The actuator assembly includes a shaft fixed to a base of the disk drive, a bearing having an inner race fixed to the shaft, a sleeve fixed to an outer race of the bearing, and an actuator arm unit fixed to the sleeve. The sleeve has a side wall formed with a hole opening in a direction of canceling the imbalance of the actuator assembly.

Disk drive actuator assembly with rotational imbalance compensation

Disclosed herein is a rotary actuator having a retractor mechanism which can retract magnetic heads to a CSS zone of magnetic disks only by a mechanical bias force in stopping a magnetic disk drive at any cylinder position of the heads. The rotary actuator includes an actuator arm assembly rotatably mounted on a base of the magnetic disk drive, an FPC mounted on one side surface of the actuator arm assembly, and a magnetic circuit constituting a voice coil motor by combination with a moving coil supported to the actuator arm assembly. A retractor plate is fixed to the actuator arm assembly at a position opposite to a mounting position of the FPC with respect to the center of rotation of the actuator arm assembly. The retractor plate functions to retract the magnetic heads to the CSS zone of the magnetic disks by magnetic reaction with a magnetic flux in the magnetic circuit.

Growing community of inventors

Kawasaki, Japan

Masaya Suwa