Abstract: A stator has a stator base including a printed circuit board provided on a nonmagnetic or weakly magnetic bracket having a shaft support section disposed in the center thereof, a single-phase connected air-cored armature coil provided on the stator base, and a drive circuit member provided on the stator base so as not to overlap the air-cored armature coil. The stator base has a groove hole extending outwardly from a central through hole. A detent torque section extending radially from the center of a detent torque generating member composed of a magnetic body and provided around the shaft support section is accommodated in the groove hole so as to be confined in the stator base in the thickness direction thereof.

Abstract: An axial air-gap rotor includes wound air-core armature coils disposed on one side of a printed wiring board, and a cylindrical commutator disposed at the rotation center. The commutator includes commutator pieces separated from each other by positioning guides provided on the base, and each having a connection terminal integral with and extending axially from an arc-shaped sliding contact portion and flat portion, the printed wiring board further having terminal connection lands for the wound air-core armature coils, and through holes connected to the terminal connection lands in which the distal ends of the connection terminals are fitted and connected on the other side.

Abstract: A simple configuration allows a rotor of a spindle motor to be eccentric in the pickup moving direction, and improves axial run-out caused by clearance between a rotating shaft and bearing. An arc shaped magnetic body is disposed on a base of a spindle motor opposite a drive magnet and in the same direction as the opposing face, thereby generating an attractive force on the outer periphery side of the rotor.

Abstract: A pushbutton switch is provided with: a switch case; a switch body fixed to the switch case; an elastic sealing body that is formed of an elastic material and covers and seals the switch body; a cap member that is formed of a hard material and is detachably mounted at a top portion of the elastic sealing body; a pushbutton portion provided on the cap member and exposing from a switch exposure aperture on a switch mounting apparatus; and a stopper portion provided on the cap member and configured to interfere with a rear surface of the switch mounting apparatus at a peripheral area of the switch exposure aperture and to restrain the cap member from being detached from the switch mounting apparatus, in a state in which the switch case is fixed to the switch mounting apparatus.

Abstract: A simple construction causes a spindle motor rotor to be eccentric in a pickup moving direction and improves axial run-out caused by clearance between a rotating shaft and a bearing. A magnetic cap is attached to an end of a bearing of a spindle motor so as to cover an end face. A ceiling of the magnetic cap is an annular magnetic material in which a lid and opposing face protruding therefrom are continuous, and the opposing face works with an annular magnet attached to the rotor to generate an attraction force that causes the rotor to be eccentric. The opposing face is formed so as to be linearly symmetrical with respect to the axis line, which is the pickup movement line.

Abstract: Because the bearing of an eccentric rotor is small, when it is integrated in a rotor by resin molding, the bearing unit can be fractured by impacts unless it has a sufficient mounting strength. Accordingly, an eccentric rotor is provided in which a sufficient mounting strength of the bearing on the rotor is ensured and the bearing unit is prevented from fracture by impacts. Also a vibration motor using the eccentric rotor is provided. The eccentric rotor includes a printed wiring board, a cylindrical bearing for insertion of a shaft, and a weight which are integrated to have a flat disk shape by resin molding. A shaft insertion hole has a diameter larger than the outer diameter of the shaft and smaller than the outer diameter of the bearing, and the bearing is integrated by resin molding in a state in which the entire periphery at the end portion thereof is disposed in contact with the printed wiring board around the insertion hole.

Abstract: Disclosed is a brushless vibration motor having a driving circuit therein, which is capable of operating like a typical DC motor. The brushless vibration motor having an eccentric rotor R having an eccentric weight 5b, a rotor case 5 and a magnet 6 which has a plurality of magnetic poles arranged in the rotor case; a shaft 2 for supporting the eccentric rotor, a housing H for supporting the shaft, a stator S which is disposed around the shaft on a stator base 1 constructing a part of the housing and which consists of armature coils to drive the rotor, and a driving circuit member lC which is mounted in a space K corresponding to an area of at least one armature coil.

Abstract: An axial-air-gap brushless vibration motor has an eccentric rotor R in which an axial-air-gap magnet and an arched weight are provided in a rotor yoke which is rotatably mounted on a shaft fixed to a yoke bracket. A stator base is attached to the yoke bracket which includes a magnetic portion receiving the magnetic field of the magnet and a nonmagnetic portion. One Hall sensor and a drive circuit member for receiving output of the Hall sensor are disposed so that they do not overlap on a radial plane, of the stator base which has single-phase air-core armature coils installed. A cover member is welded to the yoke bracket.

Abstract: A vibration motor has an eccentric rotor having a plurality of armature coils with at least one winding-type air core armature coil disposed in an eccentric manner on a printed wiring board. A commutator is disposed on the printed wiring board. An eccentric weight is disposed so as not to overlap with at least one winding-type air-core armature coil and at least two of the air-core armature coils overlap. A magnet imparts a magnet field to the eccentric rotor via an axial air gap, a brush that imparts electric power to the air-core armature coils via the commutator.

Abstract: An eccentric rotor wherein a printed wiring board in which commutator segments are formed at a first surface, two wound air-cored coils arranged with a prescribed arrangement angle about the shaft as a center at the second surface of the printed wiring board, and a weight are integrally molded into a disk-like shape with a resin by injection molding. The weight comprises a first surface of the weight which is exposed at the side surface of the rotor together with the first surface of the printed wiring board and a second surface of the weight which is exposed at the other surface of the rotor together with the wound air-cored coil. The resin which integrates the aforementioned components and forms an outer peripheral resin portion having a circular-arc periphery about the shaft as a center. The outer contours of the weight and printed wiring board are so formed as to assume positions separated from the outer periphery inwardly in a circular-arc portion.

Abstract: A brushless motor includes a highly reliable thrust-receiving member that simplifies the machining and assembling of parts and prevents deformation of the bearing and leakage of lubricating oil. A stator base has a cylindrical portion serving as a base portion of a bearing housing of the motor. The cylindrical portion is integral with the stator base. A sleeve bearing is pressed in and mounted in a fixed condition on the inner side of the cylindrical portion. A stator core consisting of a conductive wire is mounted in a fixed condition on the outer side of the cylindrical portion, thereby forming a stator. A thrust-receiving portion for the rotary shaft is molded integrally with the stator base at the opening of the cylindrical portion by outsert and resin integral molding, this thrust-receiving portion serving to receive the end of the rotary shaft opposite to the output end thereof.

Abstract: A lubricating oil scattering prevention arrangement provided near a bearing whereby the outward scattering of lubricating oil that leaked from between a stator and rotor due to tilting, impact or the like is prevented. A plate-shaped rotor case 30 is provided with a descending portion 31, a step portion 32 and an outer peripheral portion 33. A magnet 4 is provided on the inner side of the outer peripheral portion 33 and a lubricating oil absorption member is provided between the magnet 4 and the step portion 32. Because an outer peripheral portion of the lubricating oil absorption member is compressed by the magnet 4 upper surface portion and the step portion 32 and thus attached, the lubricating oil absorption member absorbs lubricating oil leaked from the bearing part and the compressed portion prevents the lubricating oil from leaking outwardly.

Abstract: An axial-air-gap brushless vibration motor has an eccentric rotor R in which an axial-air-gap magnet and an arched weight are provided in a rotor yoke which is rotatably mounted on a shaft fixed to a yoke bracket. A stator base is attached to the yoke bracket which includes a magnetic portion receiving the magnetic field of the magnet and a nonmagnetic portion. One Hall sensor and a drive circuit member for receiving output of the Hall sensor are disposed so that they do not overlap on a radial plane, of the stator base which has single-phase air-core armature coils installed. A cover member is welded to the yoke bracket.

Abstract: A brushless motor has a drive circuit component mounted on a stator which has plating conducted on a copper foil land to facilitate soldering. Need for a plating line from the outside is eliminated by providing an internal plating connection trace connected to a power feed terminal portion which is subsequently cut by a guide hole for an armature coil. An adhesive resin is applied to the stator where the circuit drive component is installed and the guide hole to adhere simultaneously to the stator to a bracket and the armature coil to the stator and bracket.

Abstract: An axial-air-gap brushless vibration motor has an eccentric ro or R in which an axial-air-gap magnet and an arched weight are provided in a rotor yoke which is rotatably mounted on a shaft fixed to a yoke bracket. A stator base is attached to the yoke bracket which includes a magnetic portion receiving the magnetic field of the magnet and a nonmagnetic portion. One Hall sensor and a drive circuit member for receiving output of the Hall sensor are disposed so that they do not overlap on a radial plane, of the stator base which has single-phase air-core armature coils installed. A cover member is welded to the yoke bracket.

Abstract: For the purpose of preventing resin from flowing into a commutator when resin molding a rotor, a rotor for a flat coreless motor comprises a printed wiring board, on one side of which a plurality of air-cored armature coils are provided, and on the other side of which a plurality of segment patterns constituting a commutator and a wiring pattern are provided. These members are molded with resin into a unitary body with the segment patterns exposed. Wiring pattern parts are provided so as to surround the outer periphery of the commutator.

Abstract: A fluid bearing with an oil circulating hole therein has a bearing housing fixedly assembled to a stator base having a closed bottom surface; and upper and lower bearing portions; and a thrust receiving portion to rotatably support a rotating shaft. An opening oil reservoir is in the bearing housing and a lower oil reservoir is formed at the lower portion thereof. An intermediate oil reservoir is located between the upper and lower bearing portions. The oil circulating hole is formed in parallel with the rotating shaft in order to communicate with the opening oil reservoir, the intermediate oil reservoir and the lower oil reservoir. A space is defined at an opening portion which is covered with a cap in order to prevent oil from leaking.

Abstract: An axial direction sliding-contact type brush apparatus is provided which can not only maintain performance of suppressing vibration of a brush of a flat vibrator motor but also allow the brush to form a stable electrical contact with a commutator. The base portion of the brush is installed at the exposed portion of the pattern of the brush base above the bracket at an elevation angle of 45° or less with respect to the brush base. The ultraviolet-cured acryl-based resin is coated on the base portion of the brush to cover a position located at about ? of the side projection length L of the brush arm portion from the base portion of the brush.

Abstract: Disclosed is a brushless vibration motor having a driving circuit therein, which is capable of operating like a typical DC motor. The brushless vibration motor comprises an eccentric rotor R having an eccentric weight 5b, a rotor case 5 and a magnet 6 which has a plurality of magnetic poles arranged in the rotor case; a shaft 2 for supporting the eccentric rotor, a housing H for supporting the shaft, a stator S which is disposed around the shaft on a stator base 1 constructing a part of the housing and which consists of armature coils to drive the rotor, and a driving circuit member 1c which is mounted in a space K corresponding to an area of at least one armature coil.

Abstract: An axially sliding contact type of a commutator which is capable of removing the problem related to a braking loose caused by magnetic force to prevent increase of consumed electricity, has a rotor including the commutator, and an electric motor having the rotor, in which a gap is axially formed. The commutator is of an axially contact type and comprises a plurality of metal plates made of copper and a noble metal layer coated on the metal plates in a state of disposing a separate layer between the metal plates and the noble metal layer. The separate layer is formed of Nickel plating having a non-magnetic property in a non-electrolysis manner.