Hitachi, Ltd.

Hitachi Global Storage Technologies Japan, Ltd.

Yuichi Koizumi

Hideaki Amano

Katsuhiro Tsuneta

Koji Kodama

Atsushi Ito

Yasuhiro Yoshimura

Toshihiro Yamada

Takashi Yamaguchi

Toshihisa Okazaki

Hiromu Hirai

Ryoji Okada

Satoru Yamaura

Toshiaki Makino

Ichiro Harashima

Hideyuki Kimura

Nobuyuki Okunaga

Marutomo Goto

Koji Shiroyama

Takashi Kono

Akio Takatsuka

Yoshihiko Kinoshita

Toshio Matsushita

Masatake Sato

Shohei Honda

A logical designing part includes a logical connectivity data storage that stores logical connectivity data, indicating a logical connectivity between plant equipments, including first end point connection data. A geometry data designing part includes a geometry data storage that stores geometry data that is graphical shape data in a three-dimensional space and includes second end point data. A data linking part includes: an automatic correspondence table generating part that compares first end point connection data with second end point data and generates a logical connection and geometry data table including correspondence data that links the geometry connection data and the geometry data of which first and second end point connection data are matched each other. A correspondence storage stores the logical connection and geometry data table. An editing part edits the logical connection and geometry data table on the basis of a user command.

Layout-design support system and layout-design support program

An information storing device and an information processing device having a memory for registering a plurality of working modes at recording/reproduction and a switching circuit for selecting one of the plurality of working modes, which select the optimum working mode automatically or by an instruction of an operator according to power supply capacity of a device of higher rank to effect recording/reproduction.

Information storing device and method for controlling same to record/reproduce information by selecting one of working modes

Information storing device and method for controlling same to record/reproduce information by selection one of working modes

An information storing device and an information processing device having a memory for registering a plurality of working modes at recording/reproduction and a switching circuit for selecting one of the plurality of working modes, which select the optimum working mode automatically or by an instruction of ah operator according to power supply capacity of a device of higher rank to effect recording/reproduction.

Information storing device and method for controlling same to

The actuator section comprises a magnetic head slider, a load beam of spring property for supporting the magnetic head slider, a guide arm and a fastening member for fastening the load beam to the guide arm. On the surface of the load beam, a flexible wiring pattern is jointed. The wiring pattern passes nearly through a center of the load beam and through a broad portion beside the fastening member. An extension wiring pattern is obtained by extending the wiring pattern from the broad portion to a circuit board attached to the actuator. At least on one side of the guide arm, a convex cross-sectional portion is so provided that opposite splice of generally flush to load beam mounting surfaces of the guide. To the respective of the splice planes, extension wiring patterns are jointed.

Wiring structure in the load beam and guide arm of a magnetic disk drive

In a closed housing of a magnetic disk memory device are accommodated a spindle motor for rotatably holding a magnetic disk medium for storage of information, a magnetic head for recording and reproducing information into and from the magnetic disk medium, a head positioning mechanism for moving the magnetic head to any position on the magnetic disk medium, and so forth. A printed board having thereon control circuit parts for controlling the spindle motor and the head positioning mechanism and recording/reproducing circuit parts for effecting the recording/reproduction by the magnetic head is arranged outside of the housing. An opening corresponding to a component of the magnetic disk memory device is formed in a certain region of the housing opposing the printed board. A shielding member for preventing a dust from entering into the housing is provided for the opening. The shielding member has a sheet-like or cup-like form and the device is constructed corresponding to the unevenness or uneven arrangement of components, thereby making it possible to reduce the thickness of the device. The commonization of the shielding member for disk devices is possible and a distance between a printed board and the housing can be reduced for the whole of the device.

Enclosure structure for magnetic disk memory device

A magnetic disk unit comprising a one-piece carriage structure having a small thermal off-tracking amount, with the carriage structure including a rotary shaft; guide arms integrally supported on a guide-arm retainer at their proximal ends and extending independently and parallely; bearing retainers formed on both ends of the guide-arm retainer; and bearings fixed on the bearing retainers rotatably connecting the guide-arm retainer to the rotary shaft. A center line in a direction of thickness of the outermost guide arm is located outside of that of the bearing in a direction of height thereof, and a concave portion is continuously formed on the bearing retainer. Thermal coefficients of expansion of the guide arms and the guide-arm retainer are substantially equal, with the carriage structure being fashioned of an alloy mainly containing Al and Si, eutectic crystal Si particles in the guide arm and/or the guide-arm retainer. The average value of the longest eutectic crystal Si particles therein is 1.6 .mu.m or less or the number of the eutectic crystal Si particles if 5.0 or more per 100 .mu.m.sup.2. In the carriage of manufacturing the carriage of the carriage structure is heated for five to fifteen hours at a temperature of 300.degree. to 500.degree. C. after die casting.

Magnetic disk unit and manufacturing method of carriage structure thereof

Growing community of inventors

Kanagawa-ken, Japan

Yuichi Koizumi