Abstract: A spindle motor includes a base plate to which a shaft is fixed, an annular stator core that is fixed to the base plate and is wound with a plurality of stator coils, and a rotor member that is attached in a rotatable state to the shaft and includes an inner sleeve portion facing an inner peripheral side of the stator core with an inner clearance and an outer sleeve portion facing an outer peripheral side of the stator core with an outer clearance, an annular groove is formed on an outer periphery of the inner sleeve portion, and the annular groove overlaps with the plurality of stator coils as viewed from a direction perpendicular to the shaft.

Abstract: A motor drive controller capable of taking measures against vibration or noise of a motor is provided. The motor drive controller configured to drive a stepping motor in microstepping mode controls the number of PWM (Pulse Width Modulation) cycles contained in one microstep cycle. More specifically, the number of PWM cycles contained in one microstep cycle is controlled so that a vibration contained in a current waveform determined by the number of PWM cycles contained in one microstep cycle does not approximate the natural frequency of the stepping motor.

Abstract: An impeller of this disclosure includes a hub having a ring shape; and a plurality of blades that are provided on an outer periphery of the hub, wherein the blade has a trailing edge formed such that an inner side of a radial width of the blade is curved in a direction opposite to a rotation direction, in a plan view as viewed in a direction of a rotation axis.

Abstract: There is provided a centrifugal fan that effectively cools an electronic component with a simple structure. The centrifugal fan comprises an impeller 8 having a plurality of pins extending in an axial direction, a rotor yoke 18 formed with a plurality of through-holes through which the pins penetrate, the rotor yoke 18 being joined to the impeller 8 as the pins penetrate through the through-holes, and a circuit board 10 arranged in a state having a gap with respect to the rotor yoke 18, wherein an end 11c? of the pin protrudes from the rotor yoke to a side of the circuit board, and the plurality of pins are arranged with uneven pitch in a circumferential direction of the impeller.

Abstract: A seal for a rolling bearing includes a core metal and an elastic member configured to cover the core metal. A fitting portion is fixed to an outer ring and a seal portion contacts an inner ring. In the outer side of the seal portion an auxiliary lip projects without contacting the inner ring and in the inner side a main lip projects contacting the inner ring. An annular groove is formed between the main lip and a thick wall portion thus forming a flexible portion having a small wall thickness at a root portion of the main lip. The auxiliary lip inhibits intrusion of foreign substances and moisture, reduces external pressure acting on the main lip and ensures the sealing performance of the main lip. The flexible portion reduces the sliding resistance of the main lip.

Abstract: A thermosetting resin composition includes an epoxy compound having an isocyanuric acid ring represented by the following formula (1), and a solid lubricant.

Abstract: A method for manufacturing a module including N layers of stacked resin is provided, wherein N is a natural number of two or more. In the method, resin of a first layer is cured to a degree that does not fully harden the resin of the first layer. Resin of a Mth layer is stacked on resin of a (M?1)th layer, wherein M is a natural number of two or more and less than N. The resin of the Mth layer is cured to a degree that does not fully harden the resin of the Mth layer. Stacking the resin of the Mth layer and curing the resin of the Mth layer are repeated. Then, resin of Nth layer is stacked, and all of the N layers of stacked resin are fully hardened.

Abstract: The present invention provides a centrifugal fan that can be easily positioned when it is installed in a device or apparatus, which can further improve positioning accuracy, and which can decrease noise, even if it is made thin. In the centrifugal fan in which an impeller is received inside a casing and air drawn in from a suction port formed on the casing by rotating the impeller is discharged from the casing to the outside of a blowing port, a circular protruded portion is formed on a peripheral edge of the suction port, and protrudes upwardly in a shaft direction from an upper surface of the casing.

Abstract: A motor drive controller includes a control unit configured to control a motor drive unit, wherein the motor drive unit includes switching circuits for the three-phase windings, respectively, each of the switching circuits including two switching elements, wherein the control unit is configured to place a first switching element among the two switching elements in an “on” state for an energization period while placing a second switching element among the two switching elements in an “off” state, to place the second switching element alternately in the “on” and “off” states for the energization period while placing the first switching element in the “off” state, and to control the second switching element in an overlapping period during which two adjacent windings among the three-phase windings are placed in a same energization state, such that a magnitude of energization of the two adjacent windings changes gradually in a linear or nonlinear fashion.

Abstract: The invention relates to a fluid-dynamic bearing system, in particular for the rotary support of a spindle motor, the bearing system comprising: a first conical bearing and a second conical bearing counteracting the first conical bearing, a fixed shaft along which the two conical bearings are arranged, a sleeve, a first and a second conical bearing component, which together with the sleeve form the first and second conical bearings, bearing structures applied to the sleeve and/or the conical bearing components, a bearing gap filled with a bearing fluid extending between the sleeve and the shaft and between the sleeve and the conical bearing components and sealed at each of its ends by a conical capillary seal, and a hub which rotates together with the sleeve about a rotation axis. The invention is characterized in that a pump seal is arranged between the first conical bearing and the adjacent capillary seal.

Abstract: An impeller for a centrifugal fan includes a base plate, a ring-shaped shroud, a tubular inlet port connecting the circular inlet of the shroud and the base plate, and a plurality of blades annularly disposed around the tubular inlet port at regular intervals. Each of the blades includes a pressurized surface, a suction surface, a leading edge, and a trailing edge. When viewed in a direction parallel to the rotation axis of the impeller, a distance between the pressurized surface and the suction surface of each of the blades becomes increasingly larger starting from the leading edge of the pressurized surface and extending toward the trailing edge of each of the blades at a predetermined height.

Abstract: A method for manufacturing a phosphor sheet is provided. In the method, a particulate phosphor and a particulate transparent medium are mixed to a first light transmissive resin in a liquid state. The first light transmissive resin containing the phosphor and the transparent medium in the liquid state is supplied into a lower mold of a mold, and the mold is closed. The first light transmissive resin containing the phosphor and the transparent medium in the liquid state is changed to a solid state having a predetermined thickness by applying a heat and a pressure to the first light transmissive resin containing the phosphor and the transparent medium in the liquid state.

Abstract: The present invention is a grease composition, comprising a fluorine-based grease, a urea-based grease and a soap-based grease (a calcium complex soap thickener, a calcium soap thickener, a barium soap thickener, a magnesium soap thickener or a sodium soap thickener), and a rolling bearing in which the grease composition is filled.

Abstract: In accordance with one aspect of the present disclosure, a motor drive control device is a motor drive control device performing PWM (Pulse Width Modulation) control of a motor, wherein harmonics of a fundamental frequency for PWM control of the motor are included in noise occurring from the motor; the fundamental frequency for PWM control is larger than a frequency corresponding to a bandwidth of a predetermined radio frequency band a communication apparatus uses; and frequencies of continuous harmonic components of the fundamental frequency for PWM control appear before and after the predetermined radio frequency band.

Abstract: A fluid dynamic pressure bearing includes a conical bearing member having a conical bearing surface forming a first gap between a member constituting the rotor. A second gap connected to one end of the first gap and provided over the entire periphery of the shaft is formed between the conical bearing member and the shaft. A tapered seal portion is formed between the conical bearing member and the rotor. The conical bearing member is provided with a circulation hole that communicates the second gap and the tapered seal portion. The circulation hole communicates to another end of the first gap through a part of the tapered seal portion, so that the circulation hole and the other end of the first gap are spaced apart.

Abstract: There is provided a body state detecting apparatus for detecting a body state of a subject on a bed, the apparatus including: a plurality of load detectors which are placed in the bed or under feet of the bed and which detect a load variation depending on a respiration of the subject; and a body state detecting unit which determines an extending direction of a body axis of the subject and a head placement of the subject based on the detected load variation. The body state detecting unit includes a body axis direction determining unit which determines the extending direction of the body axis of the subject based on the detected load variation, and a head placement determining unit which determines the head placement of the subject, in the determined extending direction of the body axis of the subject, based on the detected load variation.