Abstract: An apparatus for applying a magnetic field has a permanent magnet, pivotally supported, which has an approximate cylindrical shape, respective semicircles of a circular section thereof being magnetized as N and S poles, and a driving coil, located in the vicinity of the permanent magnet so that the permanent magnet can partially penetrate inside the loops of the driving coil, the rotation and the positioning of the permanent magnet being controlled by the strength and/or directions of current flow in the driving coil. The apparatus is used for a magneto-optical disk storage. Since the driving coil is close to the permanent magnet, the pivoting of the permanent magnet can be controlled with a fast response. In addition, the apparatus can be made relatively small.

Abstract: An optical switch includes at least one optical fiber exit terminal disposed in a plane, at least first and second optical fiber entrance terminals disposed in the plane, and a movable reflector disposed in the plane and angularly movable about a point in the plane for reflecting and/or refracting a light ray from the optical fiber exit terminal selectively into one of the first and second optical fiber entrance terminals for thereby optically coupling the optical fiber exit terminal and said one optical fiber entrance terminal. When the optical fiber exit terminal and the optical fiber entrance terminal are optically coupled to each other, the movable reflector is held against a stopper while it is being subjected to a certain torque, so that the movable reflector is stably stopped.

Abstract: A linear motor driving a carriage used in a magnetic memory. The motor includes a rotor portion having a hollow sleeve like member extending outwardly from the carriage at the side opposite to the magnetic head mounting portion of the carriage and a driving coil wound around the forward end of the hollow member; and a stator portion on the frame body of the magnetic memory and having a central yoke disposed within the hollow member along the direction of carriage movement, a U-shaped yoke surrounding the driving coil with the legs thereof being parallel to the central yoke, and a pair of permanent magnets mounted on the opposed faces of the legs of the U-shaped yoke. By means of this linear motor, the magnetic memory can be reduced in dimension.

Abstract: A compact-sized stepping motor including a laminated stator assembly provided on an inner periphery thereof with a plurality of stator poles, stator coils magnetically connected to the laminated stator assembly, and a rotor having a plurality of rotor poles opposed to the stator poles. The rotor has assembled therein a permanent magnet and is rotatably supported between housings. The upper and the lower housings are each provided with a disc-shaped locating portion engageable with the inner peripheries of the stator poles of the laminated stator assembly, and the center-alignment between the stators and the rotor is assured by the locating portions, so that an accurate phasic relationship can be obtained between the rotor and the stators. The laminated stator assembly has a non-magnetic member core plate and a plurality of stator plates laminated on opposite sides of the non-magnetic member core plate.

Abstract: A carriage device used for moving and positioning a magnetic head opposite prescribed tracks of a magnetic disk has the magnetic head mounted on a carriage which has linear motor mechanisms built integrally therein. The linear motor mechanisms incorporate coils secured to part of the carriage and permanent magnets secured aorund the coils. Guide rails serving to support the carriage within the range of the sliding motion of the coils are made of a magnetic substance.

Abstract: The present invention provides a micro stepping motor for more accurately stepping and positioning a magnetic head in a magnetic disc system. The stepping motor has a permanent magnet type rotor and a stator encircling the rotor, the rotor having a plurality of pole teeth formed therein with a fine pitch and the stator also having a plurality of pole teeth formed therein with a fine pitch and disposed opposed to the pole teeth in the rotor, the stator pole teeth being divided into at least one pair of pole tooth groups which are out of phase relative to each other by an electrical angle of 180 degrees. A single common stator coil is provided to the pair of stator pole tooth groups. Thus, the stepping pitch of the rotor is determined by the pitch in the pole tooth groups, whereby the rotor can steppingly be driven with higher density even by the reduced number of stator coils.

Abstract: A synchronous motor for a timepiece capable of cancelling unbalance in self-starting driving power with regard to the oscillating direction at the time of self-starting, in which adjoining stator pole pitch angles are set at 0.5 times or 1.5 times the rotor pole pitch angle. Provision of specific directional performance is restricted to direction of self-starting rotation. The air gap between the stator supplementary poles and the rotor is set at a ratio between 1 and 1.4 against the air gap between the stator main poles and the rotor; width of the stator supplementary poles is wider than the stator main poles.

Abstract: A pulse motor for clockworks and the like in which the rotor comprises two spaced-apart permanent magnetic disks mounted upon a common shaft and rotatable with respect to a stator. The stator comprises a respective pair of magnetic poles in the plane of each disk, the poles of the pair being interconnected by a shank and a coil wound upon the respective shanks, the coils lying on opposite sides of the rotor. The coils can be excited independently to cause the respective pair of poles to magnetically cooperate with the respective disk and rotate the motor in the forward or the reverse sense.

Abstract: A compound pulse motor for driving a printer or the like comprising an armature having linear magnetic poles and rotational magnetic poles and a stator having stationary linear magnetic poles and stationary rotational magnetic poles. In operation, the linear magnetic poles of the armature interact with the stationary linear magnetic poles of the stator to produce transverse motion of the armature. Furthermore, when excited, the rotational magnetic poles of the armature and the stationary rotational magnetic poles of the stator interact to produce rotational motion of the armature.

Abstract: A reversible pulse-motor driving circuit comprising a steady driving circuit composed of an oscillator circuit, a frequency divider circuit, a waveform conversion circuit, and a driving circuit, and a fast correction driving-circuit composed of a fast correction set-circuit, a first gate circuit, a detector circuit, a normal and reverse discrimination circuit, a conversion change-over circuit, a pulse selector circuit, a first memory circuit, a second gate circuit and a second memory circuit, whereby a user can hear a time signal delivered from a calculation circuit and only push a pushbutton to rotate the pulse motor in a reverse direction when the second hand is ahead of the correct time, and rotate the pulse motor in a forward direction when the second hand is lagging with respect to the correct time, and the use of a frequency higher than the steady driving frequency permits a fast setting of the second, minute or hour hand to the correct time.