Abstract: This invention intends to provide a storage unit capable of improving data transmission efficiency and reducing a seek time. The storage unit of this invention comprises a read/write head for carrying out read/write with respect to a recording medium, a VCM for moving the read/write head during seek operation, and a seek command executing section for outputting a VCM voltage when a seek start permission signal is inputted from a seek timing issuing section. The seek timing issuing section outputs a seek start permission signal in order to start the seek operation to the seek command executing section at a timing at which the read/write operation ends.

Abstract: A discharge system (100) may discharge gases produced by a die-casting machine. The die-cast machine may include a first die (150) and a second die (170) that are configured in order to form cast products. A closure device defines an enclosed region (190) between opposing surfaces (151, 171) of the first and second dies. A transfer device (110, 120, 122, 130) serves to discharge the gases within the enclosed region to the outside. The first and second dies are configured to form a portion of the closure device.

Abstract: A shock absorbing material comprising an Al—Mg—Si series aluminum alloy having high strength and showing excellent energy absorbing property when compressed in the axial direction of extrusion is obtained. The shock absorbing material of the invention has a hollow cross section, mainly comprises a fibrous structure and can be manufactured by press quenching just after extrusion followed by aging. In the press quenching, press quenching under air-cooling advantageous in view of the dimensional accuracy or the cost can be adopted. Further, the shock absorbing material of the invention has excellent cracking resistance to a compressive load in the lateral direction as well as in the axial direction. The shock absorbing material of the invention is suitable as side members or bumper stays in the frame structures of automobiles.

Abstract: A disk apparatus having a ramp loading mechanism. A disk medium on which second servo patterns have been written in a landing area on the medium at a finer interval than that of first servo patterns written in a data area is used. When a head is moved from a ramp to the landing area on the medium, a lead-in processing unit performs a servo lead-in on the basis of the second servo patterns written in the landing area at a fine interval.

Abstract: A magnetic disk unit writes, on a magnetic disk, a burst position error data which is used for correcting a positional error of a burst pattern which is used for correcting an error within one track, next to the burst pattern. A write head is controlled a position so as to satisfy a relationship M=N when (N−1)K <WHD<NK, where WHD denotes a core width of a write head, K denotes a pitch of burst boundaries of the burst pattern, and M denotes a number of regions of the burst position error data which need to be provided after the burst pattern. The burst position error data is written on the magnetic disk by the write head the position of which is controlled in this manner.

Abstract: A storage apparatus is provided with a load/unload mechanism which carries out a ramp load/unload operation to load/unload a head which is provided on an arm with respect to a recording medium by a driving part which drives the arm, and a controller controlling a driving current which is supplied to the driving part so as to undergo a gradual change during at least one of a load operation and an unload operation.

Abstract: A disk unit has a function of loading a head on a disk from a holding mechanism during a load operation and unloading the head from the disk during an unload operation. The disk unit includes a controller which controls a movement of the head so that the loading operation and the unloading operation are carried out in a specific region on the disk, and the specific region extends for an angular range smaller than 360°. Alternatively, the controller controls the movement of the head so that the loading operation and the unloading operation are carried out uniformly in a circumferential direction of the disk within a specific region on the disk.

Abstract: A door beam to obtain a maximal load and an energy absorption required in no need of increase in weight without occurrence of rupture thereof and to have deformation of a cross-section effected in a stable manner even when a length of the door beam is shortened, wherein a cross-section that a compression-side flange and a tension-side flange are connected parallel to each other, by at least one web in a section perpendicular to a length direction and central lines of the compression-side flange and the tension-side flange are shifted from each other.

Abstract: A valve device including a main body formed with a passage for allowing a refrigerant to flow therethrough; and a valve member provided in the passage. The main body includes an aluminum alloy containing 0.2 to 1.5 weight % of Si; 0.2 to 1.5 weight % of Mg; 0.001 to 0.2 weight % Ti; at least 0.1 weight % of Mn, Zr or the both; and Al and inevitable impurities, and having a fiber structure.

Abstract: A scanner includes a light-beam emitter for emitting a light beam; a light-beam deflector for deflecting the light beam to scan a scanning surface; a photo-detector provided at a position outside an image-forming scanning range of the scanning surface to detect a scanning light beam before the scanning light beam starts generating a scanning line in the image-forming scanning range; a rotatable member, located in front of an incident surface of the photo-detector, that is rotatable about a rotational axis perpendicular to a plane defined by the scanning light beam by the deflector; an optical member, provided on the rotatable member, that allows the scanning light beam to pass therethrough to be incident upon the incident surface of the photo-detector; and a device for adjusting rotational position of the rotatable member about the rotational axis.

Abstract: An Al—Mg—Si based aluminum alloy extrusion having large strength, absorbable impact energy and resistance against compressing cracking, wherein the average size of Mg2Si precipitation in the [1 0 0] and [0 1 0] directions of the (1 0 0) plane inside grains is 20 nm or more, the distribution density of the Mg2Si precipitation in the [0 0 1] direction of the (1 0 0) plane is 100 or more per &mgr;m2, and the size of precipitations on grain boundaries is 1000 nm or less. Alternatively, in the Al—Mg—Si based aluminum alloy extrusion, a tensile strength obtained from a tensile test performed at a strain rate of 1000 per second is from 150 to 400 N/mm2 (both inclusive).

Abstract: An energy-absorbing member of extruded aluminum alloy which is composed of Mg (0.5-1.6 wt %), Zn (4.0-7.0 wt %), Ti (0.005-0.3 wt %), Cu (0.05-0.6 wt %), and at least one of the following elements: Mn (0.2-0.7 wt %), Cr (0.03-0.3 wt %), and Zr (0.05-0.25 wt %), with the remainder being Al and inevitable impurities, said energy-absorbing member having a hollow cross-section and fiber structure and being one which has undergone averaging treatment.

Abstract: An aluminum extruded door beam includes an outer flange, an inner flange, and at least one web for connecting the outer flange and the inner flange. The outer corners at the extended ends of the outer flange have a radius R of 2.5 mm or less. The outward corners at the connections between the web and the inner flange and between the web and the outer flange have a radius R of 2 mm to 4 mm. The radius of the outward corners at the connections between the web and the inner flange and between the web and the outer flange is 1.5 to 2 times the width of the web. The length of the extended ends of the outer flange is 1 to 2 times the radius R of the outward corner at the connections between the web and the outer and inner flanges. The aluminum alloy extruded door beam material contains 0.8 to 1.5% by weight (hereinafter the same) of Mg and 4 to 7% of Zn, and the recrystallization surface layer has a thickness of 50 &mgr;m or less.

Abstract: A disk apparatus having a ramp loading mechanism. A disk medium on which second servo patterns have been written in a landing area on the medium at a finer interval than that of first servo patterns written in a data area is used. When a head is moved from a ramp to the landing area on the medium, a lead-in processing unit performs a servo lead-in on the basis of the second servo patterns written in the landing area at a fine interval.

Abstract: A head speed control method for a disk unit having a head provided on a tip end of an arm is constructed to include a step of switching and controlling a head speed to a plurality of target speeds which are set in advance, during at least one of a ramp unload operation in which the head is receded to a parking area other than on a recording surface of a disk and a ramp load operation in which the head receded at the parking area is returned on the recording surface of the disk.

Abstract: An aluminum extruded door beam includes an outer flange, an inner flange, and at least one web for connecting the outer flange and the inner flange. The outer corners at the extended ends of the outer flange have a radius R of 2.5 mm or less. The outward corners at the connections between the web and the inner flange and between the web and the outer flange have a radius R of 2 mm to 4 mm. The radius of the outward corners at the connections between the web and the inner flange and between the web and the outer flange is 1.5 to 2 times the width of the web. The length of the extended ends of the outer flange is 1 to 2 times the radius R of the outward corner at the connections between the web and the outer and inner flanges. The aluminum alloy extruded door beam material contains 0.8 to 1.5% by weight (hereinafter the same) of Mg and 4 to 7% of Zn, and the recrystallization surface layer has a thickness of 50 &mgr;m or less.

Abstract: Provided is an energy absorbing member which makes it possible to induce contraction and deformation into a form of bellows, with Euler's buckle being restrained. An energy absorbing member comprises a hollow extrusion which is made of an aluminum alloy and has an outer portion and an inner rib connected to the outer portion, and the radius of the corner where the rib and the outer portion are connected to each other is not more than a half of the thickness of the rib. A similar energy absorbing member has plural inner ribs which are connected to the outer portion and cross each other, and the radius of the corner where the ribs cross each other is 1 mm or less.

Abstract: An aluminum extruded door beam includes an outer flange, an inner flange, and at least one web for connecting the outer flange and the inner flange. The outer corners at the extended ends of the outer flange have a radius R of 2.5 mm or less. The outward corners at the connections between the web and the inner flange and between the web and the outer flange have a radius R of 2 mm to 4 mm. The radius of the outward corners at the connections between the web and the inner flange and between the web and the outer flange is 1.5 to 2 times the width of the web. The length of the extended ends of the outer flange is 1 to 2 times the radius R of the outward corner at the connections between the web and the outer and inner flanges. The aluminum alloy extruded door beam material contains 0.8 to 1.5% by weight (hereinafter the same) of Mg and 4 to 7% of Zn, and the recrystallization surface layer has a thickness of 50 &mgr;m or less.

Abstract: In a magnetic disk apparatus in which heads integrally having write heads and read heads are arranged correspondingly to data surfaces of plural media, servo information including phase servo patterns is written discretely in a track direction onto the data surfaces of the plural media. For this reason, at first, displacement amounts of the read heads with respect to the write heads are measured in each head and each cylinder position of the media. Next, phases of the phase servo patterns are adjusted so that relative displacement amounts between the reads heads are eliminated in each head and each cylinder position of the media, and the phase servo patterns are written.

Abstract: An aluminum alloy containing Si: 1.5-12% (mass % here and hereinafter), Mg: 0.5-6% and, optionally, at least one of Mn: 0.5-2%, Cu: 0.15-3% and Cr: 0.04-0.35% and, further, containing Ti: 0.01-0.1% and the balance of Al and inevitable impurities, in which the average grain size of crystallized grains of Si system compounds is from 2 to 20 .mu.m and an area ratio thereof is from 2 to 12%. The alloy is melted to obtain a cast ingot having DAS (Dendrite Arm Spacing) of 10 to 50 .mu.m, which is then put to a soaking treatment at 450 to 520.degree. C. and then to extrusion molding. The aluminum alloy has excellent machinability with no addition of low melting metals.