Abstract: An antenna includes an elongate laminated core, a core case having an electrical insulating property and housing the core, and a coil wound around the core between both end portions of the core through the case. The core has a first and second groups, each including thin plates of amorphous soft magnetic alloy laminated with each other, and is configured by stacking the first and second groups one another. Each of the thin plates of the core includes flanges provided at both end portions thereof, and a coil wound portion between the both end portions, and the case includes projections, which push the both end portions of the thin plates of the second group to separate from the both end portions of the thin plates of the first group in the laminating direction of the thin plates of the core while the core is housed in the case.

Abstract: An antenna includes an elongate laminated core, a core case having an electrical insulating property and housing the core, and a coil wound around the core between both end portions of the core through the case. The core has a first and second groups, each including thin plates of amorphous soft magnetic alloy laminated with each other, and is configured by stacking the first and second groups one another. Each of the thin plates of the core includes flanges provided at both end portions thereof, and a coil wound portion between the both end portions, and the case includes projections, which push the both end portions of the thin plates of the second group to separate from the both end portions of the thin plates of the first group in the laminating direction of the thin plates of the core while the core is housed in the case.

Abstract: An electric rotating machine having permanent magnets comprising a rotor having a plurality of permanent magnets, a stator iron core disposed in opposite relation with the rotor, and a stator winding wound around the stator core, wherein the stator core is constituted by a yoke and a plurality of teeth portions disposed to the yoke. The teeth portions are projected towards the inner periphery of the rotor. The teeth portions is made of amorphous magnetic material.

Abstract: Disclosed is a permanent magnet generator incorporated in a 3.5″ diskette that can be used as an input/output adapter for memory cards that can generate a power generation output of 40 mW or more when the rotor of the generator is rotated at 300 rpm. The permanent magnet generator has such a construction that rotor magnetic poles are provided only on one end face of a disc-shaped permanent magnet serving as a rotor, a plurality of stator magnetic poles are provided only on that end face of the permanent magnet in such a manner as to face the rotor magnetic poles, and a soft magnetic hub is fixedly fitted to the other end face of the permanent magnet. Even when a bonded NdFeB magnet is used as the permanent magnet, a sufficient power can be produced.

Abstract: A diskette incorporating a flat disk-shaped permanent magnet generator is disclosed. This permanent magnet generator comprises a rotor having a permanent magnet that can rotate together with a hub; the permanent magnet having a plurality of rotor magnetic poles on the circumference thereof, and a stator comprising a plurality of magnetic pole teeth having on one end thereof stator magnetic poles that can face the rotor magnetic poles via a magnetic gap. The magnetic pole teeth extend from the stator magnetic poles outside of the rotor, with stator coils wound on the extended portions of the magnetic pole teeth and the outside ends of the magnetic pole teeth connected to each other by a back yoke. The thickness of the outward extending magnetic pole teeth is smaller than the thickness of the permanent magnet. The diskette should preferably be a 3.5″ floppy disk.

Abstract: A permanent magnet generator incorporated in a diskette that can be inserted into a floppy disk drive is disclosed. In the permanent magnet generator, electric power is generated as a rotor is caused to rotate at a revolution twice to ten times as high as that of the drive shaft of a floppy disk drive by transmitting the rotation of the drive shaft to a rotor via a speed increasing mechanism incorporated in a diskette. Since the cogging torque of the generator is reduced, the rotor can be caused to rotate with a small drive torque. This allows the generator to produce a high output.

Abstract: Disclosed is a permanent magnet generator incorporated in a 3.5″ diskette that can be used as an input/output adapter for memory cards that can generate a power generation output of 40 mW or more when the rotor of the generator is rotated at 300 rpm. The permanent magnet generator has such a construction that rotor magnetic poles are provided only on one end face of a disc-shaped permanent magnet serving as a rotor, a plurality of stator magnetic poles are provided only on that end face of the permanent magnet in such a manner as to face the rotor magnetic poles, and a soft magnetic hub is fixedly fitted to the other end face of the permanent magnet. Even when a bonded NdFeB magnet is used as the permanent magnet, a sufficient power can be produced.

Abstract: In a diskette, such as a 3.5″ floppy disk, having adjoiningly a permanent magnet generator and a space for inserting a memory card with a magnetic stripe, the affection of leakage magnetic flux from the generator permanent magnet to the memory card and another floppy disk that may be put in the neighborhood of the diskette is substantially eliminated and the generator output is increased. A magnetic shield is disposed only at the portion corresponding to the magnetic stripe of the memory card on a generator housing or a partition between the generator permanent magnet and the memory card space. A magnetic shield ring with a diameter substantially equal to or larger than the outside diameter of the permanent magnet is fixed or pasted on one side end of the rotor permanent magnet adjacent to one of the ends of the diskette case.

Abstract: A permanent magnet generator is so thin as to be incorporated in a 3.5″ diskette. The generator having so low cogging torque that can be rotated smoothly even by a low torque driving source as a 3.5″ FDD to generate stable output is disclosed. It has stator magnetic poles facing via a magnetic gap an outer circumferential surface of the stator permanent magnet having a plurality of magnetic poles on it. One to six of the stator magnetic poles are removed and instead of the removed magnetic poles provided is a soft magnetic piece to face the rotor magnetic poles. Grooves are preferably provided on the soft magnetic piece, facing the rotor magnetic poles. A notch is provided on the permanent magnet generator to avoid interference with an input/output terminal and/or a card contact terminal of the diskette for inserting a memory card.

Abstract: In an optical switch for connecting optically a first optical fiber supported on a stationary supporting block to a second optical fiber supported on a movable supporting block being movable relative to the stationary supporting block between a first position for the optical connection between the terminating ends of the first and second optical fibers and a second position for disconnecting the optical connection therebetween and being adjacent to the stationary supporting block, and a magnetic flux generator for generating a magnetic flux for moving the movable supporting block relative to the stationary supporting block, the movable supporting block includes a soft magnetic substance so that the magnetic flux passes through the movable supporting block.

Abstract: A rotor 2 comprises of a pair of claw shape magnetic poles 3N and 3S and plural permanent magnets 5. The permanent magnet 5 is arranged between claw portions of the claw shape magnetic poles 3N and 3S. A permanent magnet fly-out prevention member 61 is arranged at an outer periphery of the claw shape magnetic poles 3N and 3S and prevents the fly-out of the permanent magnet 5 when the rotor 2 rotates. A permanent magnet holding member 62 holds the permanent magnet 5 from an inner periphery side. In a construction in which the permanent magnet fly-out prevention member 61 is arranged between the claw portions of the claw shape magnetic poles 3N and 3S, the working operation for arranging the permanent magnet 5 between the claw portions of the claw shape magnetic poles 3N and 3S can be improved, thereby a vehicle use AC generator having an improved electric power generation efficiency can be provided.

Abstract: Disclosed is a permanent magnetic field type rotating machine. The rotor core is made of a single chemical composition material comprising ferromagnetic and nonmagnetic zones. The nonmagnetic zones consists of a remolten and solidified metal structure and of a merely heated and cooled metal structure, and are present at portions of the rotor core where leakage flux is produced.

Abstract: A brushless motor having permanent magnets that can be used as a prime mover for automobiles, in place of internal combustion engines, since the motor can yield high torque during low-speed rotation, as in the case of conventional types of brushless motors and can be used at high torque and with excellent motor efficiency at rotations three times as high as that of conventional types.

Abstract: Disclosed is a permanent magnet field-type rotating machine of a high efficiency having an internal magnet-type rotor. The rotating machine comprises an internal magnet-type rotor having a plurality of permanent magnets embedded in a rotor yoke, and a stator disposed in opposed, spaced relationship to the rotor, with an air gap formed between the rotor and the stator. The rotor yoke comprises a member in which ferromagnetic regions and non-magnetic regions coexist, and the non-magnetic regions are disposed respectively at those positions of the rotor yoke where leakage magnetic flux is liable to be generated.

Abstract: A head positioning system for a magnetic disk drive includes an actuator arm that is mounted on a pivot bearing so that the axis of rotation of the arm passes through the center of mass of the arm. A Faraday-type motor using a single coil applies a force couple to the arm at a location offset from the center of mass of the arm with a constant moment arm. The offset force couple creates a pure torque about the axis of rotation of the arm (that is, about the pivot bearing) in order to substantially eliminate reaction forces on the bearing; this greatly lessens wear on the bearing and in turn reduces the non-repeatable run-out error of the read/write head mounted at the end of the arm. Various arrangements of permanent magnets and motor windings are provided to create the force couple.

Abstract: A latch mechanism, especially for use in a disk drive, includes a locking arm that rotates about a pivot and engages a slot on the moving member that is to be locked, such as a head-arm. In a fixed coil embodiment, a permanent magnet is attached to an inboard end of the locking arm within the windings of a coil. Ferrous elements are mounted between the coil and the pivot of the locking arm. The ferrous elements attract the permanent magnet to hold the locking arm securely in either a latching or an unlatching state. When the coil is energized, poles are induced in the ferrous elements such that one repels the permanent magnet away from its then current state into the opposite state, while the other ferrous element attracts the permanent magnet to the other state. The magnetic field of the coil simultaneously applies a pure torque to the locking arm. This torque rotates the locking arm so that the arm changes to its other state.