Abstract: A process for producing a coating film consisting of a single coating layer or a plurality of coating layers laminated, which comprises a coating operation of relatively moving at least one of a die for discharging a coating liquid containing short fibrous fillers from a linear opening with a predetermined length and a substrate for coating, on which the coating liquid discharged from the die is coated, to form a coating layer on the substrate for coating, wherein the direction in the coating operation includes at least two different angle directions with regard to the single coating layer or the plurality of coating layers of the coating film.

Abstract: A reliable hydrodynamic bearing having high rotational accuracy is offered. The hydrodynamic bearing for a small-sized motor is made of a special nonmagnetic steel material that is excellent in terms of machinability, wear resistance, and corrosion resistance. This special steel material contains 14.00% Cr, 8.00% Mn, 0.20% C, 2.00% Ni, 0.35% Si, and less than 0.05% P. This special steel material has high machinability and so machining accuracies such as surface roughness and squareness can be enhanced. Consequently, the rotational accuracy of the hydrodynamic bearing can be enhanced. This special steel material also has such a property that when pressure is applied to plastically deform it, the pressed surface hardens. Using this nature, the surfaces at which rotating and stationary parts of the bearing contact with each other are pressed. Thus, the surfaces are hardened. Hence, the wear resistance is improved.

Abstract: A hydrodynamic bearing fitted with a seal portion capable of suppressing oil leakage efficiently is offered. Also, a rotor device and a motor using this bearing are offered. The seal portion is formed using a shaft-side tapering portion formed in a shaft and a sleeve-side tapering portion formed in an insertion hole in a sleeve. If the axis of rotation tilts when the shaft is at rest or during rotation, the interval between the outer surface of the shaft and the inner surface of the insertion hole decreases in the opening portion of the insertion hole. However, the two tapering portions secure a gap sufficient to hold oil within the hydrodynamic bearing if the interval decreases. Leakage of the oil from the opening portion of the insertion hole can be suppressed efficiently.

Abstract: Highly heat-resistant labels usable with the adherends which can be exposed to high temperatures are provided.

Abstract: In a hydraulic bearing motor, by means of dynamic pressure generating grooves provided on a thrust shaft with a larger diameter not only on the end face thereof but also on the shaft surface thereof, pressures generated in oil when rotating a shaft body are made to be applied not only in the axial direction but also in the radial direction with high magnitude. This can provide the hydraulic bearing motor as being capable of satisfying features of exhibiting small NRRO, and vibration and shock resistance even with a thinned hydraulic bearing motor.

Abstract: A process for producing a coating film consisting of a single coating layer or a plurality of coating layers laminated, which comprises a coating operation of relatively moving at least one of a die for discharging a coating liquid containing short fibrous fillers from a linear opening with a predetermined length and a substrate for coating, on which the coating liquid discharged from the die is coated, to form a coating layer on the substrate for coating,

Abstract: A hydraulic dynamic pressure bearing motor has a rotational shaft mounted to undergo rotation about a rotational axis and having a shaft section and a flange section. A sleeve has a cavity for receiving the rotational shaft. A cover member is disposed over an open end of the sleeve cavity. A hydraulic dynamic pressure bearing includes minute radial and thrust clearances disposed between outer surface portions of the shaft and flange sections of the rotational shaft and inner surface portions of the sleeve and the cover member. A lubricating fluid is disposed in the minute radial and thrust clearances. The minute radial and thrust clearances are dimensioned so that during a non-rotational state of the rotational shaft, the flange section of the rotational shaft contacts preselected inner surface portions of the sleeve and the cover member while the shaft section of the rotational shaft does not contact any portion of the sleeve and an inner peripheral surface of the cover member.

Abstract: A process for producing a membrane-electrode assembly for solid polymer electrolyte fuel cells, including providing a die having an inlet for introducing coating liquids, a linear exit for discharging the coating liquids, and at least one guide partition wall for partitioning the inlet into compartments extending to the linear exit and slanted relative to the direction in which a substrate facing the linear exit moves relatively to the die, introducing the coating liquids from the inlet, and passing the coating liquids through the compartments separately, and moving at least one of the die and substrate so that the substrate relatively moves at substantially right angles to the longitudinal direction of the linear exit to coat the substrate with the coating liquids and form catalyst layers.

Abstract: A process for producing a membrane-electrode assembly for solid polymer electrolyte fuel cells, which comprises bonding electrodes having a catalyst layer containing a catalyst as a cathode and an anode onto both sides of a cation exchange membrane as a solid polymer electrolyte membrane, wherein the cation exchange membrane is formed from a dispersion having a fluorinated polymer having sulfonic acid groups as an ion exchange polymer and a fibrilliform fluorocarbon polymer dispersed in a dispersion medium.

Abstract: A method for producing a membrane electrode assembly 1 for solid polymer electrolyte fuel cell, the membrane electrode assembly 1 including a solid polymer electrolyte membrane 2 comprising an ion exchange membrane, a first electrode 3 having a first catalyst layer 31, and a second electrode 4 having a second catalyst layer 41,the first electrode 3 and the second electrode 4 being disposed so as to be opposed to each other via the ion exchange membrane, the method including: applying a coating solution containing a catalyst onto a base film 101 to form a first catalyst layer 31; applying a coating solution containing an ion exchange resin dissolved or dispersed in a liquid onto the first catalyst layer 31 to form an ion exchange membrane; then applying a coating solution containing a catalyst onto the ion exchange membrane to form a second catalyst layer 41; and finally, peeling off the base film 101 from a resulting laminate.

Abstract: In a spindle motor, a core with a specified thickness is formed by laminating thinnest possible magnetic steel sheets to allow consumed current to be reduced. For example, by providing a structure of a core of a spindle motor with seven 0.2 mm thick steel sheets being laminated, it becomes possible to make consumed current smaller than that for a core laminated with four 0.35 mm thick steel sheets. Thus, a spindle motor is provided as being suited for downsizing an HDD and possible to reduce consumed power.

Abstract: In a thin dynamic pressure hydraulic bearing motor used for a compact HDD device which motor is provided with a thin hydraulic dynamic pressure bearing comprising a flanged rotary shaft comprising a shaft and a flange, a sleeve into which the flanged rotary shaft is rotatably inserted, a ring-like lid 35, and lubricating oil filling minute clearances formed by those bearing components, the thrust clearance c is determined as being equal to or less than a value for which a product md of the maximum vertical shift m at a rim of a magnetic disk and a diameter d of the flange of the flanged rotary shaft is divided by 4r, four times a radius r of the magnetic disk. Thus, even when no bearing stiffness is provided for the hydraulic dynamic pressure bearing motor at rest, the magnetic disk is made so as not to contact with a head supporting system such as a head loading arm.

Abstract: In a hydraulic bearing motor, by means of dynamic pressure generating grooves provided on a thrust shaft with a larger diameter not only on the end face thereof but also on the shaft surface thereof, pressures generated in oil when rotating a shaft body are made to be applied not only in the axial direction but also in the radial direction with high magnitude. This can provide the hydraulic bearing motor as being capable of satisfying features of exhibiting small NRRO, and vibration and shock resistance even with a thinned hydraulic bearing motor.

Abstract: A motor rotor 10 is formed as follows: First, in a first forging step, a hum manufacturing primary block 6A is formed. Next, a second forging step B is effected to form the primary blank 6A into a secondary blank 6B. In this step, a forging die is used to secure an annular yoke 34 to the inner cylindrical surface 61a of a hub cylindrical portion 61 by punching, in such a manner that both whole edges of the annular yoke are sealingly closed thereby. In the second forging step B, by drawing the inner cylindrical surface 34a of the annular yoke, its circularity is improved. The annular yoke can be secured to the hub cylindrical portion with use of an adhesive agent. Moreover, the annular yoke can be fixed in such a manner that it is accurately coaxial with the hub cylindrical portion. In addition, the gap between the annular yoke and the hub cylindrical portion can be eliminated.

Abstract: A spindle motor has a fixed member of a motor, a rotor rotatably supported with respect to the fixed member, a shaft provided on either the fixed member or the rotor, a first ball bearing fitted on a head side of the shaft and a second ball bearing fitted on a base side of the shaft and having an axial dimension larger than an axial dimension of the first ball bearing. A circumferential wall, preferably on the fixed member, has a small gap with an outer circumferential wall of an outer ring of the second ball bearing.

Abstract: A spindle motor comprises a motor shaft, which is rotatably supported by a motor frame via a bearing and a hub, which is formed integral with the motor shaft for securing a data disk. The hub is made of a powder metallurgical product and is bonded with the motor shaft by sintering.

Abstract: A magnetic disk driving device includes a frame which supports a shaft, a hub adapted to hold a disk, and upper and lower bearings which are fitted in a bearing holding hole and rotatably support the hub. The frame includes a cylindrical protrusion which is confronted through a small gap d with the outer cylindrical surface of the outer race of the lower bearing. The small gap d forms a labyrinth in the space through which the inside of the lower bearing is communicated with the outside. The inner cylindrical surface of an annular protrusion formed on the bottom of the hub, and the inner cylindrical surface of the cylindrical protrusion are substantially equal in diameter.

Abstract: A current feed means is connected to an armature coil of a motor. Current is fed from the current feed means to the armature coil while the frequency of the current is gradually varied from a preset frequency to another preset frequency, thereby to vibrate the motor. The amplitudes of the frequencies are measured by a frequency analyzer means, which is brought into contact with the motor. The frequency at which the amplitude of the vibration of the motor is peaked indicates the natural frequency of the motor.

Abstract: A magnetic disc drive device includes a labyrinth structure proximate to the ball bearings to effectively prevent scattering of particles. The labyrinth structures are formed by various arrangements where complicated passages are defined by elements arranged proximate to the inner ring and the outer ring of a ball bearing. One of the elements forming the passages being either the hub or the frame of the magnetic disc drive device.

Abstract: A disk drive motor having a center shaft, a pair of ball bearings inner rings thereof being fixedly fitted with the center shaft while interposing a predetermined distance therebetween, a hub being supported so as to be rotatable about the center shaft while having outer rings of the ball bearings fixed to an inner hole thereof, a drive magnet integrally rotating the hub, a stator core being arranged so as to confront the drive magnet, and a first seal means and a second seal means being respectively arranged along ways to a space outside the motor to constitute seal mechanisms while communicating the respective ball bearings with the space outside the motor, wherein an annular spacer is fixedly fitted with the center shaft between the inner rings of the pair of ball bearings and an outer circumferential surface of the spacer confronts an inner circumferential surface of the inner hole of the hub while interposing a small gap therebetween, so that a labyrinth seal mechanism is formed.