Abstract: A rotor includes a rotor hub including a through-hole to which the shaft is fixed. An upper end and a lower end of an opposing region where an outer peripheral surface of the shaft and an inner peripheral surface of the through-hole oppose each other in a radial direction are respectively provided with an upper gap portion and a lower gap portion opposing each other through a space in the radial direction. The upper gap portion and the lower gap portion each include a bottom portion extending in a direction intersecting the center axis and a peripheral wall portion connected to a radial outer edge of the bottom portion and extending along the center axis.

Abstract: A contactless power feeding system comprises a power feeding device and a movable device. The movable device is installed on a power feeding case of the power feeding device, and a liquid crystal TV (E) is installed on the movable device. The liquid crystal TV (E) can be arranged at a desired position on a wall (W) in a room (R) by moving the movable device along the power feeding case. The liquid crystal TV (E) can be arranged at a desired height by moving the liquid crystal TV (E) in the axial direction of a guide pipe provided on a power receiving case. The liquid crystal TV (E) can be directed in a desired direction by rotating the liquid crystal TV (E) around the guide pipe. The contactless power feeding system feeds power to the liquid crystal TV (E) via the power feeding device and the movable device.

Abstract: A bearing mechanism includes a stationary portion and a rotating portion. The stationary portion includes a shaft portion and a plate portion. The rotating portion includes a sleeve including an annular portion, a cylindrical portion, an annular bottom surface, and a first communication hole. The rotating portion includes a ring member arranged to cover at least a portion of an opening of the first communication hole, and faces the plate portion via a first gap. A pumping groove array is disposed in the plate portion or the ring member. A second communication hole is disposed between the ring member and the annular bottom surface, and connected to the first communication hole. At least a portion of the opening of the second communication hole is positioned on a farther radial direction inner side than the pumping groove array.

Abstract: A power feeding device includes: a series circuit including a primary coil and a capacitor connected in series with each other; a switching circuit and a control circuit. The power feeding device is configured to supply power from the primary coil to a secondary coil of a power receiving device in a non-contact manner. The switching circuit is configured to alternate a direction of a voltage between both ends of the series circuit. The control circuit is configured to control a frequency by which the switching circuit performs alternating operation for alternating the direction of the voltage. The control circuit is configured to: measure a voltage at a connection point between the primary coil and the capacitor; and determine, based on a phase of the voltage, whether current flowing through the primary coil is in a phase advance state or a phase delay state.

Abstract: A non-contact power supply system includes a power supply device and a power reception device. The power supply device includes primary coils arranged on a power supply surface and configured to be excited at an operational frequency. The power reception device includes a secondary coil configured to induce current using resonance phenomenon based on alternating flux from the primary coils when arranged on the power supply surface. The operational frequency that excites the primary coil is set at or in the proximity of a resonance frequency of a resonance system formed when the secondary coil is located at an intermediate position between two of the primary coils that are adjacent to each other.

Abstract: A base member includes a base through-hole which interconnects an upper opening and a lower opening. An insulating sheet portion is disposed at a lower surface side of the base member. The insulating sheet portion covers at least a portion of the lower opening. Lead wires extending from coils extend to the lower surface side of the base member through the base through-hole. The lead wires extend radially outward along a lower surface of the insulating sheet portion while making contact with the insulating sheet portion. The lead wires are soldered to land portions of a circuit substrate. The lower opening is covered with a sealing material. The circuit substrate includes a first region. The insulating sheet portion is defined by a smaller number of layers than the first region.

Abstract: A wireless power supply system includes a plurality of primary coils and a movable secondary coil. The primary coils excited by the supply of high-frequency current are configured so as to generate an alternating magnetic field by which secondary power is generated in the secondary coil. The resonance characteristics of a resonator including excited primary and secondary coils vary with the movement of the secondary coil within a varying range. The power supply frequency (fn) of the high-frequency current is set to the frequency (fp) corresponding to the intersecting point (P) between a first resonance characteristic line and a second resonance characteristic line, which correspond to the respective two ends of the varying range of the resonance characteristics and are farthest apart from each other.

Abstract: A spindle motor includes a stationary portion with a shaft, a circular plate portion, a wall portion, and a plate portion. The plate portion has a flat plate portion and an annular convex portion. The sleeve includes an annular portion, an outer side cylindrical portion, and an inner side cylindrical portion. The inner side cylindrical portion and an upper radial dynamic pressure groove array are superimposed in a radial direction. The upper radial dynamic pressure groove array includes a plurality of upper spiral grooves that is inclined in one direction with respect to an axial direction and a plurality of lower spiral grooves that is inclined in another direction opposite to the one direction. A lower end of the upper spiral grooves is positioned farther on an upper side than an upper surface of the annular portion.

Abstract: A contactless power feeding system comprises a power feeding device and a movable device. The movable device is installed on a power feeding case of the power feeding device, and a liquid crystal TV (E) is installed on the movable device. The liquid crystal TV (E) can be arranged at a desired position on a wall (W) in a room (R) by moving the movable device along the power feeding case. The liquid crystal TV (E) can be arranged at a desired height by moving the liquid crystal TV (E) in the axial direction of a guide pipe provided on a power receiving case. The liquid crystal TV (E) can be directed in a desired direction by rotating the liquid crystal TV (E) around the guide pipe. The contactless power feeding system feeds power to the liquid crystal TV (E) via the power feeding device and the movable device.

Abstract: A base member includes a base through-hole which interconnects an upper opening and a lower opening. An insulating sheet portion is disposed at a lower surface side of the base member. The insulating sheet portion covers at least a portion of the lower opening. Lead wires extending from coils extend to the lower surface side of the base member through the base through-hole. The lead wires extend radially outward along a lower surface of the insulating sheet portion while making contact with the insulating sheet portion. The lead wires are soldered to land portions of a circuit substrate. The lower opening is covered with a sealing material. The circuit substrate includes a first region. The insulating sheet portion is defined by a smaller number of layers than the first region.

Abstract: A spindle motor includes a stationary portion with a shaft, a circular plate portion, a wall portion, and a plate portion. The plate portion has a flat plate portion and an annular convex portion. The sleeve includes an annular portion, an outer side cylindrical portion, and an inner side cylindrical portion. The inner side cylindrical portion and an upper radial dynamic pressure groove array are superimposed in a radial direction. The upper radial dynamic pressure groove array includes a plurality of upper spiral grooves that is inclined in one direction with respect to an axial direction and a plurality of lower spiral grooves that is inclined in another direction opposite to the one direction. A lower end of the upper spiral grooves is positioned farther on an upper side than an upper surface of the annular portion.

Abstract: A bearing mechanism includes a stationary portion and a rotating portion. The stationary portion includes a shaft portion and a plate portion. The rotating portion includes a sleeve including an annular portion, a cylindrical portion, an annular bottom surface, and a first communication hole. The rotating portion includes a ring member arranged to cover at least a portion of an opening of the first communication hole, and faces the plate portion via a first gap. A pumping groove array is disposed in the plate portion or the ring member. A second communication hole is disposed between the ring member and the annular bottom surface, and connected to the first communication hole. At least a portion of the opening of the second communication hole is positioned on a farther radial direction inner side than the pumping groove array.

Abstract: A layout method of a semiconductor integrated circuit includes detecting a path having a constraint violation in a laid-out semiconductor integrated circuit, determining an insertable range of a buffer to be inserted on a route of the path so as to remove the constraint violation, evaluating, with respect to a cell already placed in the insertable range, a wiring length, and presence or absence of a constraint violation if the cell is hypothetically moved to an empty space in a vicinity of the insertable range, determining an insertion position of the buffer based on a result of the evaluation, moving the cell already placed at the insertion position of the buffer to the empty space in the vicinity of the insertable range, placing the buffer at the insertion position, and rerouting the buffer and the moved cell.

Abstract: A rotating portion of a motor includes a hub body portion and a shaft arranged to extend in an axial direction. The hub body portion includes a through hole and a recessed portion. The recessed portion extends radially outward from an outside surface of the shaft, has an annular shape and is recessed axially downward. The recessed portion includes first, second, and third ridge portions. The first ridge portion is an axially upper edge of an inside surface defining the through hole, the second ridge portion is arranged radially outward of the first ridge portion, and the third ridge portion is arranged radially outward of the second ridge portion, and is located axially above both the first ridge portion and the second ridge portion. An adhesive is arranged to cover the outside surface of the shaft and reach a portion of the second ridge portion.

Abstract: A base unit includes a stator and a base member including a first recess portion, a second recess portion, and at least one through-hole. The first recess portion is arranged on an upper surface of the base member to surround the hole portion and depressed toward the lower surface thereof. The second recess portion is arranged radially outward of the first recess portion and depressed toward a lower surface thereof. The through-hole is arranged inside the first recess portion to extend through the base member. The second recess portion includes a protrusion portion and a third recess portion. The protrusion portion protrudes from the lower surface of the base member toward the upper surface of the base member. The third recess portion is depressed from the lower surface of the base member toward the upper surface of the base member and positioned at the opposite side from the protrusion portion.

Abstract: A base member of a motor includes a base through-hole extending through a bottom portion thereof. Two or more lead wires extending from coils pass through the base through-hole. Thus, as compared with a case where the lead wires pass through different base through-holes respectively, it is possible to reduce the number of the base through-holes. Accordingly, it is possible to minimize or prevent a reduction in the rigidity of the base member. Insulating sheet portions are arranged on the lower and upper surfaces of the base member. Each insulating sheet portion includes an overhang portion which overlaps with the base through-hole when seen in a plan view. The lead wires extending from the coils are led out toward the lower surface of the base member through holes, cutouts, or slits defined in the overhang portion. This makes it possible to easily distinguish the led-out lead wires from each other.

Abstract: A non-contact power supply system includes a power supply device and a power reception device. The power supply device includes primary coils arranged on a power supply surface and configured to be excited at an operational frequency. The power reception device includes a secondary coil configured to induce current using resonance phenomenon based on alternating flux from the primary coils when arranged on the power supply surface. The operational frequency that excites the primary coil is set at or in the proximity of a resonance frequency of a resonance system formed when the secondary coil is located at an intermediate position between two of the primary coils that are adjacent to each other.

Abstract: A contactless power supply system is provided with an electric appliance, which includes a secondary coil of a power reception device, and a contactless power supply device including a setting surface, which is formed by a plurality of adjacent power supply areas, and a primary coil, which is arranged in each power supply area. The contactless power supply device excites the primary coil to supply secondary power to the secondary coil of the electric appliance that is set on the setting surface. The secondary coil has a larger coil contour than the primary coil.

Abstract: A base member includes a base groove portion, at least one base through-hole, and a first insulating sheet portion. The base groove portion is positioned on a lower surface of the base member. The base through-hole extends through the base member. The first insulating sheet portion is arranged on a bottom surface of the base groove portion. A lead wire extending from a coil is led out into the base groove portion through the base through-hole. The base through-hole includes a major axis extending in a radial direction and a minor axis extending in a circumferential direction. The base through-hole has a radial length larger than a circumferential width thereof. A portion of an edge of the first insulating sheet portion is arranged on the lower surface of the base member to intersect the major axis of the base through-hole and to cover a portion of the base through-hole.

Abstract: A spindle motor and a disk drive apparatus include a base member, an armature positioned above the base member, and a circuit substrate electrically connected to coils of the armature. The base member includes a bottom portion positioned below the armature and a lower slant surface extending radially outward and upward from an outer peripheral portion of a lower surface of the bottom portion. The circuit substrate includes a plurality of land portions arranged on its lower surface. The lower slant surface includes a first slant surface and a second slant surface arranged along a circumferential direction. At least one land portion is respectively arranged on each of the first slant surface and the second slant surface.