Fujitsu Corporation

Katsuaki Ishida

Tomoo Sukagawa

Yoshiaki Nagasawa

Masaharu Sugimoto

Hisashi Kaneko

Tsuneyori Ino

Tsuyoshi Furukawa

Shinichi Fukuzawa

Masaki Jinbo

Osamu Yamazaki

Yukihiro Komura

Mitsuhisa Sekino

In a disk device including, on a base, at least one recording disk rotated by a spindle motor, a carriage equipped with heads for executing read/write operations with the recording disk and a voice coil motor for driving the carriage, whereby the carriage includes an arm portion for mounting the heads at a distal end thereof, a main body equipped with a rotary shaft and a rotor portion serving as a rotor of the voice coil motor, the present invention provides a carriage structure capable of reducing noise and accomplishing a high transfer rate. According to the first embodiment, an anchor member comprising a flat sheet portion and an extension portion and made of a sheet metal is disposed on the flat surface portion of the side surface of the carriage main body, and a flexible circuit board is wound on the anchor member and is, in this state, connected to the carriage. Therefore, a package area on the carriage side can be increased. According to the second embodiment, a control IC of a bare chip is packaged to a connection portion of the flexible circuit board and the carriage by a flip packaging method, and other chip components are packaged by a surface packaging technology. According to the first and second embodiments, the space at which the head IC, the servo IC and the peripheral circuits are disposed integratedly can be secured at the connection portion of the flexible circuit board with the carriage. Therefore, the noise at the time of read/write by the heads can be reduced and a transfer rate can be improved while heat radiation by the components can be taken into consideration.

Carriage structure for disk device

A disk drive includes a disk drive housing and a frame that supports the disk drive housing, wherein a thermally conductive elastic member is interposed between the disk drive housing and the frame for conducting heat in the disk drive housing to the frame and for isolating vibration.

Frame structure of a disk drive for improved heat dissipation and a disk

A breather structure for ventilation between the inside and outside of the housing of the disk drive is realized by a simple, inexpensive construction. The cover structure is for a disk drive provided on a base with a spindle motor carrying recording disks and an actuator for driving a carriage carrying heads for writing information on the disks, with the inside sealed airtight by attaching a cover to the gas through a gasket, and with an antivibration plate for preventing vibration and noise from generating when driving the disks at the surface of the cover contacting the outside air either directly or through a viscoelastic member. A ventilation groove for ventilating between the inside and outside of the disk drive is realized by forming a breather passage designed considering the passage conductance between the cover and the antivibration plate, providing a breather vent communicating the breather passage with the outside in the antivibration plate at one end of the breather passage, and providing a breather vent communicating the breather passage with the inside of the disk drive at the cover at the other end.

Ventilation structure of a cover for a disk drive

A magnetic disk drive having one or more magnetic disks, one or more read/write heads each recording or reproducing information for a corresponding one of the magnetic disks, a servo head reading control information from a predetermined one of the magnetic disks, and an actuator supporting the one or more read/write heads and the servo head includes first leads extending from the one or more read/write heads along one side of the actuator, and second leads extending from the servo head along the other side of the actuator so that the second leads can be distanced in space from the first leads.

Magnetic disk drive and flexible printed board used in such drive

A breather filter unit for a magnetic disk drive including a base and a cover fixed to the base, the cover having a vent. The breather filter unit includes a casing fixed to an inner surface of the cover, the casing having a vent inlet communicating with the vent of the cover and a vent outlet communicating with an inside of the magnetic disk drive, and a first filter contained in the casing at a position adjacent to the vent inlet, the first filter being formed from a plurality of fibers extending in a direction substantially parallel to that of an air flow from the vent inlet to the vent outlet. The breather filter unit further includes a second filter bonded to the casing so as to cover the vent outlet, and an activated carbon layer contained in the casing at a position between the first filter and the second filter.

Breather filter unit for magnetic disk drive

Disclosed is a magnetic disk apparatus having a large internal accommodation space. This magnetic disk apparatus comprises a case defining accommodation space inside, magnetic disks disposed in the accommodation space, a spindle motor, magnetic heads and a rotary actuator. The case includes a cover having a first flat portion and a first upright portion standing upright on the first flat portion at a peripheral portion thereof, and a base having a second flat portion and a second upright portion standing upright on the second flat portion at a peripheral portion thereof. This design can ensure a sufficient strength even if the case is made thin, thus allowing the internal accommodation space to be increased. The magnetic disk apparatus also has a printed circuit board, which is provided at the case and has a control circuit mounted thereon for controlling the magnetic heads. The printed circuit board supplies a source voltage to the case. Accordingly, the magnetic disks and the magnetic heads can be kept at the same potential via the case.

Magnetic disk apparatus

A head actuator for a magnetic disk drive unit which eliminates the possibility of track slip due to a mechanical external force and allows high-speed access. The head actuator includes a carriage having a body provided rotatably to a shaft fixed to a housing and an arm fixed to the body so as to extend substantially perpendicularly to the shaft, a supporting member mounted on the body on its side opposite to the arm with respect to the shaft, and a coil fixed to the supporting member and receiving a driving force from a static magnetic field. The supporting member is formed of a material having a specific gravity larger than that of a material forming the body of the carriage.

Head actuator for magnetic disk drive unit

A magnetic disk device includes a flexible printed circuit board having a first portion provided with read/write ICs for read/write heads and first printed patterns connected to the read/write ICs and a second portion positioned within the first portion, an end of the second portion being connected to the first portion so as to be bendably projected from the first portion, the second portion being provided with a servo IC for the servo head and second printed patterns connected to the servo IC, the flexible printed circuit board being mounted on an actuator body such that one end of the first portion lies outside the actuator and the second portion lies on the actuator body. The magnetic disk device also includes first lead wires of the read/write heads extending to the flexible printed circuit board and being connected to the first patterns, and second lead wires of the servo head extending to the flexible printed circuit board and being connected to the second printed patterns. The first lead wires and the read/write ICs are on one side of an imaginary plane while the second wires and the servo IC are on an opposite side of the imaginary plane, the imaginary plane passing through the tip end of an arm structure and a shaft of the actuator body and being parallel to the shaft.

Magnetic disk drive and flexible printed circuit board

A swing head arm type magnetic disc apparatus includes a magnetic disc having a data R/W zone and a CSS zone, and is accommodated in a housing and a spindle rotably supported on the housing, a head arm provided with a floating-type magnetic head and secured to the spindle, a motor for driving the spindle when a seek operation is performed, and apparatus for imparting torque to the spindle. The torque imparting apparatus imparts torque such that the total torque obtained by summing up torque provided by a head arm and the torque by the torque imparting apparatus itself is made uniform irrespective of rotational position of a head arm, and acts in a direction which causes the magnetic head to move toward the CSS zone.

Growing community of inventors

Kawasaki, Japan

Katsuaki Ishida