Hitachi, Ltd.

Hitachi Global Storage Technologies Japan, Ltd.

The Furukawa Electric Co., Ltd.

The University of Tokyo

Tetsuya Hamaguchi

Toshihiko Shimizu

Keiko Watanabe

Toshihiro Arisaka

Hiromitsu Masuda

Gentaro Nakamura

Shinobu Yoshida

Takenori Atsumi

Takeshi Yoshida

Kenji Mori

Masaaki Matsumoto

Shozo Saegusa

Shuji Imazeki

Takayuki Nakakawaji

Shinsuke Higuchi

Tomokazu Ishii

Kei Yasuna

Hiroaki Rikihisa

Takeshi Ooi

Yutaka Ito

Hiroshi Sasaki

Hiroyuki Matsumoto

Yoshihiro Shiroishi

Tomoyuki Hamada

Hiromitsu Tokisue

Takashi Yoshida

Takashi Yamaguchi

Tatsuya Ito

Masahiko Sega

Heigo Ishihara

Yukio Kato

Yoshinori Matsunaga

Mitsuyoshi Shouji

Yukio Katou

Yuji Nishimura

Takashi Matsuki

Tsuyoshi Arai

Hisashi Morooka

Shizuo Yamazaki

Shin Nagahiro

Kazuaki Usui

Masaru Matsushima

Yuko Morita

Takenori Atumi

A fuel mixture for fuel cells, comprising a gelled product containing at least a fuel and a gelling agent, in which reliquefaction for the fuel of the gelled product is brought about in the coexistence with a reliquefying agent; and a method of extracting a fuel for fuel cells, including: providing a gel structure in which a fuel is incorporated into a network structure of a gelling agent, with a reliquefying agent dispersed therein; adding a reliquefaction inducing agent to the gel structure to make the reliquefying agent break the network structure of the gelling agent, and thereby reliquefying and extracting the fuel.

Fuel mixture, fuel reliquefying system, fuel cartridge using the same, and method of extracting fuel; for fuel cells

A liquid actuator, which contains: an electrolyte layer () containing a liquid, two or more electrically separated electrode parts () on one or both sides of the electrolyte layer, and a water-repellent layer () having a porous structure on an outside surface of at least one of the electrode parts, in which the electrolyte layer (), the electrode parts (), and the water-repellent layer () form a structural body,

Liquid actuator

A carriage includes a slider on which a magnetic head for reading/writing information from/to a disk is mounted, a suspension for carrying the slider and for applying a predetermined load to the slider, a carriage arm to which the suspension is attached, and a body section to which the carriage arm is connected. The carriage arm includes a suspension fixing portion, as arm arranged substantially in parallel with a disk surface, and a restricting member which is a thin-plate-like member having a surface which is opposite to the plane of arm which is parallel to the disk surface. The restricting member and the arm are coupled via a viscoelastic body.

Carriage arm assembly for locating magnetic head, and magnetic disk apparatus using the same

A carriage for a magnetic disk apparatus includes a slider on which a magnetic head for reading/writing information from/to a disk is mounted, a suspension for carrying the slider and for applying a predetermined load to the slider, and a carriage arm to which the suspension is attached. The carriage arm includes a suspension fixing portion, first and second arms arranged substantially in parallel with a disk surface, and a restricting member having a surface opposite to the first and second arms. The restricting member and the first arm, and the restricting member and the second arm are coupled via a viscoelastic body.

A carriage arm assembly for swingably supporting a magnetic head which includes a slider, a suspension carrying the slider, a carriage arm to which the suspension is attached, and a body section. The carriage arm extends from the body section and includes first and second arm members extending substantially in parallel with a swinging plane of the carriage arm, and a fixing portion provided at a distal end of the carriage arm for mounting the suspension thereon. Each of the first and second arm members have narrow sections in a distal end area and a base end area thereof, wherein a width of the narrow sections in a swinging direction is smaller than a width of an intermediate area of the first and second arm members.

A magnetic disk drive having a high recording density and enabling high speed transfer is achieved by reducing vibration of a carriage arm assembly to reduce a positioning error. The disk drive is configured so that a carriage arm is configured by two arm portions, the arm portions being coupled to each other by a restraint member through a viscoelastic material, the restraint member being supported on a carriage body or an area of the carriage arm in the vicinity of the body by means of adhesion or a viscoelastic material. By providing a high damping effect against various vibration modes in which in-plane bending and out-plane bending of the carriage arm are generated, vibration of the carriage arm assembly is suppressed, so that the positioning error is reduced, thereby the magnetic disk drive having a high recording density can be achieved.

Carriage arm assembly for magnetic disk drive

According to the invention, there is provided a carriage arm assembly including a carriage arm having two arm members. The arm member is constructed in such a way that the width of its coil side end and the width of its suspension side end are narrower than that of its intermediate area. This construction widens a servo band width, improves positioning accuracy, and reduces positioning errors of a magnetic disk apparatus, so that recording density is improved and storage capacity is increased. Further, by coupling two arm members using a restriction member via a visco-elastic member, it is possible to achieve a high damping effect on various vibration modes including in-plane bending of the arms, and suppress vibration of the carriage so as to reduce the positioning errors.

A rotary disk type storage device has a casing comprised of a box-shaped base casing, whose one side is opened, and a cover casing closing the open side of the base casing, in which accommodated are a magnetic disk, a spindle for rotating the magnetic disk, and an actuator for moving a magnetic head slider to a desired position on the magnetic disk. A film member having an adhesive layer is bonded to an outside of an edge portion of the casing to reduce vibrations of a side wall of the cover casing and therefore vibration-induced noise.

Rotary disk type storage device

An object of the invention is to provide a method of assembling a disc which can reduce an unbalance of a rotating portion. The method of assembling a disc-like recording medium has a first step of mounting a disc-like recording medium to a disc apparatus in a state capable of moving the disc-like recording medium with respect to a hub of a spindle motor in a direction of a disc radius, a second step of pressing an outer diameter of the disc in a direction of a center axis of the hub by a first flat member so as to bring an inner diameter of the disc into contact with an outer diameter of a rotary axis of the hub, a third step of pressing back the outer diameter of the disc contact with the first flat member and the outer diameter of the disc at an opposite position to the center of the disc in an inverse direction to a pressing direction of the first flat member to a half of an amount of tolerance between the inner diameter of the disc and the outer diameter of the hub, by a second flat member placed substantially in parallel to the first flat member and in an opposite side to the center axis of the hub, and a fourth step of fixing the disc to the spindle motor hub by a clamp member.

Method for assembling disc apparatus

Under existence of an impact and a vibration, a throughput and a reliability of a recording and reproducing operation in a magnetic disc apparatus are reduced. Accordingly, a mechanism for fixing a coarse moving actuator at an optional position is provided, at a time of following to a track, a motion of the coarse moving actuator is restricted and a positioning is performed by a fine moving actuator. Even when a vibration and an impact is applied from an external portion during the track following operation, it is possible to prevent the head position from being shifted and it is possible to perform a recording and reproducing operation. Further, it is possible to prevent adjacent data from being erroneously broken.

Magnetic disc apparatus having actuator for head positioning mechanism

An acceleration detecting apparatus for a magnetic disk apparatus capable of detecting with high reliability the disturbances such as rotational and translational shocks and vibrations applied externally to the magnetic disk apparatus to thereby prevent destruction or the like damages of data recorded on a disk of the magnetic disk apparatus upon occurrence of off-track event under the influence of the disturbance. The apparatus includes a pair of acceleration detectors for detecting acceleration in two directions extending discretely in parallel to each other. The acceleration detectors are disposed at positions closer to the magnetic disk relative to a pivot shaft for a head supporting arm as viewed in a longitudinal direction of an oblong box-like casing of the magnetic disk apparatus in a plane which forms an angle not greater than 10 degrees relative to the plane of the magnetic disk. By employing the angular acceleration detectors in combination with an angular velocity detector, the rotational disturbances due to rotational shock/vibration can be detected with much enhanced reliability, and destruction of the data recorded on the magnetic disk due to the off-track read/write operation can positively be prevented.

Information recording disk apparatus

A magnetic disk drive having a disk for storing information, a spindle motor for rotating the disk, a head for recording information into the disk and reproducing information from said disk, a suspension supporting a slider provided with the head, a carriage supporting the suspension, a voice coil motor for exerting a rotational torque to the carriage so as to locate the head on the disk, a base and a cover, and a ramp serving as a guide for unloading the head from the disk. A part of the suspension slides over the ramp so as to effect the unloading operation and the position or the posture of the ramp is changed by sliding movement of the part of the suspension over and with respect to the ramp during the unloading operation.

Magnetic disk drive with a movable ramp mechanism for relieving impact upon loading and unloading

A magnetic disk apparatus includes that a head positioning actuator assembly is retracted to a predetermined position for retraction at the time of stop of power supply from a power source, an electric power to be supplied to a driving circuit of the actuator assembly at the time of stop of power supply from the power source is supplied in three separate steps with time differences therebetween. First, an electric power for stopping the actuator assembly is supplied. With a second power supply using a small electric power, the actuator assembly starts a retracting operation at a sufficiently low speed so that it reaches the vicinity of a ramp. Thereafter, a third power supply is performed to accelerate the actuator assembly so that it is surely retracted to the predetermined position for retraction. Since the speed of impingement of the actuator assembly upon the ramp at this time can be set to a sufficiently low value, it is possible to reduce the damage of the ramp.

Retraction control method and magnetic disk apparatus

In magnetic disk structures having a high density, positioning errors (generally referred to as &ldquo;flutter error&rdquo;) occur due to a fluctuation of a magnetic disk. As a result, reading precision deteriorates. This is a significant problem in realizing a large capacity for a magnetic disk apparatus. This can be resolved by providing a magnetic apparatus such that a suspension which holds a slider having a magnetic head at one end and which is attached to a supporting arm at the other end is inclined so that an interval between the suspension and the magnetic disk is small on the inner rim side and is large on the outer rim side with this arrangement, the occurrence of the positioning error due to the fluctuation of a deformation of the magnetic disk is reduced, thereby enabling a high density recording of the magnetic disk.

Magnetic disk apparatus

A magnetic head slider having a recording-reproducing element for recording and reproducing information relative to a magnetic recording medium. A sliding protective film is formed at one outer side or each of opposite outer sides of that portion, constituting the recording-reproducing element, in a direction perpendicular to a travel surface of the magnetic head slider opposed to the magnetic recording medium, at least part of the sliding protective film covers that portion reaching the travel surface, and the sliding protective film is also formed on each of side surfaces of the slider.

Magnetic slider head and method of producing the same

Growing community of inventors

Chiyoda, Japan

Tetsuya Hamaguchi