Abstract: A polyarylene sulfide resin composition having an excellent fluidability and a good moldability is disclosed. The resin composition is useful as a material for an optical pick-up part which has a high reliability and a high tenacity and does not generate deviation of an optical axis with changes in environmental conditions such as temperature and humidity. The polyarylene sulfide resin composition comprises, as main components, a polyarylene sulfide resin, a fibrous filler and a particulate filler, and, optionally, a silane coupling agent and an alicyclic hydrocarbon.

Abstract: A width of polar teeth is made smaller at a region close to a gate portion 20 than a width of the polar teeth at the other region or a part of the polar teeth is eliminated at the region close to the gate portion 20 and the gap between the polar teeth is thereby increased so as to provide such a cavity as to facilitate the flow of a resin in an axial direction between the polar teeth, whereby the flow of the resin is facilitated.

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.

Abstract: An elastic rubber piece is set in a through-hole formed in a connecting member in such a manner that it is clamped by the protruded portions of a handle member. The elastic rubber piece, being held between the end faces of the protruded portions, is deformed and brought into contact with the inner surface of the through-hole. The handle member is so set that it is swingable about the axis of the through-hole of the connecting member.

Abstract: An insulated magnet wire, being pushed against the arcuate guide surface of a guide member, is held in semi-circular stripping cuts formed respectively in a pair of clamping parts forming a clamp tool which are opened and closed by being turned about a fulcrum. Under this condition, the clamp tool 10 is moved along the magnet wire, to cause the semi-circular stripping cuts to strip the magnet wire.

Abstract: A motor in which flange portions are partially formed on the outer peripheral surface of a housing. Flange portions, which can be respectively superimposed on the flange portions of the housing, are formed on the inner peripheral surface of a stator core. Projected portions and screw holes are formed in the stator core such that they are positioned adjacent to each other. Then, while the flange portions of the stator core are respectively superimposed on the flange portions of the housing, screws are respectively inserted through the screw holes in the flange portions in contact with the projected portions into screw holes formed in a circuit board, whereby the flange portions of the stator core are flexed to press down the flange portions of the housing, so that the housing can be fixed to the circuit board.

Abstract: A magnetic disk drive device has a hub for driving a magnetic disk when the magnetic disk is placed on the hub. A drive magnet is fastened to the inner surface of the hub. A stator core, with a coil wound thereabout, is located in opposition to the drive magnet. A frame is provided for fixedly supporting the stator core. A cutout portion is formed in the bottom of the frame, and a flexible printed circuit is disposed within the cutout portion. The coil terminal wires of the stator core and flexible lead wires are connected to the flexible printed circuit. A plural number of protrusions integral with the frame are disposed within the cutout portion. An arc-shaped lead wire holder, which is arc-shaped along the circumference of the frame, is fitted to the plural number of protrusions.

Abstract: A disk holding device contains a turn table for holding a disk having a disk center hole in the center thereof on the turn table; a disk mount member disposed on the center portion of the turn table and fitted with the center hole of the disk; an operation member mounted to freely move in a disk loading and unloading direction; an engagement member disposed to freely move in the radial direction of the disk mount member, the engagement member being brought into contact with the disk center hole when the disk is fitted into the disk mount member; urging device for urging the engagement member in the radial direction of the disk mount member; and urging force releasing device for releasing an urging force applied to the engagement device by the urging device in accordance with the movement of the operation member.

Abstract: In an electric motor, in order to simplify the structure and to remarkably improve the T/N characteristic value, yoke plates mounted on a field magnet are so shaped that the total magnetic flux of the field magnet is collectively extended to the iron core of the armature with its direction repeatedly reversed. That is, in the motor, the multi-polarization is substantially obtained by designing it in such a manner that the total magnetic flux of the field magnet is not dispersed but concentrated. Hence, in the motor, unlike a conventional motor, the field magnet is not subjected to multi-polar magnetization, and the armature side is simplified in structure, and the magnetic flux from the field magnet is maximaly utilized at all times, so that the number of magnetic poles and the effective flux .PHI. are both increased.

Abstract: A switch is provided which is simple in constitution and can be efficiently mounted on a circuit board, and a method of efficiently mounting the switch on the board is also provided. In particular, a switch device comprises a circuit board including a conductor pattern; a fixed contact member provided on a land portion of the conductor pattern; a movable contact member movable to touch/detach with the fixed contact member; a casing for receiving the movable and fixed contact members; locking member for fitting the casing to the circuit board, the locking member being provided in the casing; a holding member for holding the movable contact member with respect to the fixed contact member in one of the touched and detached condition, the holding member being provided in the casing.

Abstract: A motor includes a rotor case having a rotor magnet so as to face a stator core; a rotating shaft as fixed through a hole formed in the center of the rotor case; and a pulley having a center hole fixedly secured to a distal end portion of the rotating shaft projecting beyond the hole in the rotor case, the pulley being fixed to the rotor case.

Abstract: A driver device for a reed switch includes a reed switch including first and second reed pieces; a first magnet for magnetizing the first reed piece so as to have a specific magnetic polarity; a rotary member located close to the second reed piece; a second magnet, fixed to the rotary member, having different magnetic poles arranged in the circumferential direction, the second reed piece being located to face the second magnet.

Abstract: A multi-needle recording head has retaining members within an electrode support block, each retaining member serving to retain a recording electrode wire. The retaining members can not only lessen a stress generated by the hardening and contracting of a resin, but also prevent generation of defects such as cracks in the vicinity of recording electrodes on a head surface. Further, such multi-needle recording head is obtained by retaining the recording electrode wires by the retaining members, each retaining member having a pressure sensitive adhesive agent or an adhesive arranged at least on a surface thereof contacting the recording electrode wire, with the recording electrode wires wound around the winding jig before the recording electrode wires are cast into the electrode support block made of the electrically insulating resin.

Abstract: A small brush-use DC motor includes a stator member including a first stator case in which a magnet is disposed; a rotor member including a rotor core on which a coil is wound, a magnetic center of the rotor core being staggered with respect to the magnetic center of the magnet; a commutator unit having a commutator on a conical portion thereof, the commutator rotating together with the rotor member; and brushes held by a second stator case in such a manner that the brushes are brought into contact with the commutator under a predetermined pressure.

Abstract: A method permits the use of a low-cost bearing and by which a bearing unit can be manufactured without requiring lathe turning or any special kind of compression, pressure application, etc., that experiences low loss and which assures high precision in the perpendicularity of the rotating shaft to be supported by the bearing. The process for manufacturing a bearing unit in which bearing that supports a rotating shaft in a freely rotatable manner is secured to mounting member. The process includes at least the following three steps: the first step for providing sizing bar in hole in bearing into which the rotating shaft is to be inserted; the second step for working an end portion of the bearing, thereby forming in an end portion of the hole a small-diameter portion that is equal in size to the outside diameter of the sizing bar; and the third step for securing the bearing to the mounting member.

Abstract: A magnetic disk drive apparatus including: a hub being rotatably supported by bearings mounted on a center fixed shaft and driving magnetic disks while having the magnetic disks attached to the outer circumferential surface thereof; a drive magnet fixedly secured to the hub; and a stator core fixed on a frame portion so as to confront the drive magnet. A clamp cap portion on a distal end portion of the hub is arranged for closing a center hole of the hub, and a tap hole is formed at the center of the clamp cap portion so that a disk clamp for clamping the magnetic disks can be screwed.

Abstract: A magnetic tape drive device includes coils wound about a stator core secured to a base board; a rotor case containing a drive magnet secured to the inner surface thereof, the drive magnet being disposed facing the stator core; and a drive member for transmitting the rotation of rotor case to a roller, the drive member positioned on an outer peripheral surface of the rotor case.

Abstract: An object of this invention is to provide a disk driving device which is small in the number of components, simple in structure, and low in manufacturing cost, and which can be miniaturized. In a disk driving device, a spindle motor and a head carriage section are provided in a disk cassette loading area, and the guide mechanism of the head carriage section is provided beside the spindle motor. The object of the invention has been achieved by arranging the spindle motor and the head carriage section collectively in the disk cassette loading area. Preferably, the spindle motor and the head carriage section are arranged on one and the same circuit board.

Abstract: A multi-layered insulating film of different thicknesses and which is easily formed on an iron core of the multipole structure in a magnetic disk drive device. The thickness of the insulating film is reduced at the narrowly spaced proximal portions of the salient poles of an iron core. The thickness may also be reduced at a midpoint in the laminating direction of the core as compared with the top and bottom end portions in the laminating direction. The coating can more easily be applied by spraying the liquid insulating film on the proximal portions of the iron core which are difficult to access. The strength of the resultant insulating film is satisfactory.

Abstract: A device for detecting the stop of a stepping-motor-operated damper for a refrigerator, the damper having a stepping motor, a baffle driven by the stepping motor, a rotation control unit for controlling the direction of rotation and the amount of rotation of the stepping motor. The device includes a memory unit for storing a set value for detecting a position where the baffle is stopped, a measuring unit for measuring an electrical drive signal provided when the baffle is being driven, a comparison unit for comparing the electrical drive signal with the set value, and a stop detecting unit for determining that the baffle has been stopped when the comparison unit determines that the electrical drive signal is larger than the set value, to output a stop signal.