Abstract: A stator includes a frequency generating pattern, a driving coil composite pattern and lead lines. A rotor includes a frequency generating pattern, a driving coil composite and lead lines. A rotor includes a rotor magnet. A separation angle formed by the lead lines is an angle obtained by multiplying an integer and an separation angle formed by a pair of S-pole and magnetic poles of the rotor magnet adjacent to each other. Further, assuming that that an area between the lead lines and U-phase coils produce overlapping areas Su.sub.1 and Su.sub.2 in a top view, that the same area and a V-phase coil produce an overlapping area Sv.sub.1, and that the same area and a W-phase coil produce an overlapping area Sw.sub.1, the relationship Su.sub.1 +Su.sub.2 :Sv.sub.1 :Sw.sub.1 =1.0:1.0:1.0 exits. With this arrangement, the lead lines are least affected by the rotor magnet and the driving coil composite.

Abstract: A sheet coil motor is configured such that a plurality of coil units are attached to a circuit substrate at a predetermined interval, the interval separating the coil units are regular. Each of the plurality of coil units includes a plurality of coils and has a shape of a sector. Accordingly, the sheet coil motor can be made thin, the number of driving sheet coils can be reduced, and the production cost can be reduced. A method of fabricating the sheet coil motor includes the steps of printing, on a sheet base, a plurality of sheet coil units, in which units a plurality of sector-shaped coils are provided, such that the coil units lie in alternately opposite directions, cutting out the sheet coil units from the sheet base, attaching sheet coil units, in which units a plurality of sector-shaped coils are provided, on a substrate at an arbitrary distance from each other, and attaching driving sheet coils thus fabricated to the substrate so as to be opposite a rotor magnet at a close distance.

Abstract: A general neuro-computer and system using it is capable of executing a plurality of learning algorithms, providing an instruction execution speed comparable with a hard wired system, and practically neglecting a time required for rewriting microprograms. The neuro-computer is constituted by a neuron array having a plurality of neurons, a control storage unit for storing microinstructions, a parameter register, a control logic, and a global memory. A host computer as a user interface inputs information necessary for the learning and execution of the neuro-computer to the system, the information including learning algorithms, neural network architecture, the number of learnings, the number of input patterns, input signals, and desired signals. The information inputted from the host computer is transferred via a SCSI to the neuro-computer to perform a desired neural network operation.

Abstract: A spindle motor mounting structure for a disk or a disk cartridge recording/reproducing apparatus includes a substrate, a spindle motor including a stator part fixed on the substrate, a spindle shaft, and a disk shaped rotor part rotatably supported on the spindle shaft, and a frame on which the substrate is mounted. The rotor part has a flange part which extends from an outer periphery thereof, and the frame includes a projecting part which confronts at least a part of the flange to prevent the rotor part from slipping out of the spindle shaft. A height of an upper surface of the projecting part from the substrate is less than or equal to a height of an upper surface of the rotor part from the substrate.

Abstract: A disk drive with a turntable for supporting a flexible magnetic disk thereon has a spindle extending centrally through the turntable for engaging a first opening formed centrally in a sheet metal hub of the disk, and a drive pin arranged eccentrically of the turntable for driving the disk by engaging a second opening formed eccentrically in the disk hub. The drive pin support is made of a sheet metal support of resilient material and has an arcuate shape which is mounted flat to an underside of the turntable for deflection in a plan normal to that of the turntable. In view of the reduction of the space required for the deflection of the drive pin support and the total thickness or height of the disk drive, the drive pin is erected on an offset head portion of the support.

Abstract: A reference period generating circuit is provided which generates a pulse having a width corresponding/to a reference period T.sub.1 in response to the input of a trigger pulse. A switch, a first resistor and a second resistor are connected in series between the first and second reference voltages. The node between the first and second resistors is connected to an inverting terminal of an operational amplifier. A non-inverting terminal thereof is connected to a third reference voltage. A clamping circuit is provided to clamp the output voltage of the operational amplifier to a predetermined value. By comparing the output voltage with a predetermined reference value by means of a comparator, a pulse representative of a timing period is generated.

Abstract: An index pulse generating system utilizes two periodic motor speed signals, one generated by a speed sensor coil actuated upon by a permanent magnet rotor mounted to a turntable, and the other generated by one of magnetoelectric converters acted upon by another permanent magnet rotor mounted to the turntable as a part of a disk drive motor. The two motor speed signals are translated respectively into two series of discrete motor speed pulses. One of the two series of motor speed pulses are produced at rates of two different predetermined numbers per complete revolution of the turntable. The two predetermined numbers have no common measure so that an AND gate or the like inputting the two series of motor speed pulses puts out at least one pulse during each turntable revolution, with the output pulse being representative of a specific angular position of the turntable.

Abstract: An index pulse generating system utilizes two periodic motor speed signals, one generated by a speed sensor coil actuated upon by a permanent magnet rotor mounted to a turntable, and the other generated by one of magnetoelectric converters acted upon by another permanent magnet rotor mounted to the turntable as a part of a disk drive motor. The two motor speed signals are translated respectively into two series of discrete motor speed pulses. One of the two series of motor speed pulses are produced at rates of two different predetermined numbers per complete revolution of the turntable. The two predetermined numbers have no common measure so that an AND gate or the like inputting the two series of motor speed pulses puts out at least one pulse during each turntable revolution, with the output pulse being representative of a specific angular position of the turntable.

Abstract: A head carriage apparatus includes a head carriage including a head being placed onto a disk for recording and reproducing information on the disk and having an extension and a connecting portion formed on the extension integrally with the head carriage, a lead-screw shaft having a lead screw in which a thread ridge and a thread groove are formed, the connecting portion being fitted in the thread groove of the lead screw, a drive part for driving and rotating the lead-screw shaft so that the head carriage is moved in a radial direction of the disk parallel to an axial direction of the lead-screw shaft, a guide shaft for guiding movement of the head carriage in a direction parallel to the radial direction of the disk, the head carriage being supported by the guide shaft at two supporting positions being located apart from each other in axial direction of the guide shaft, and a resilient part for pressing the lead-screw shaft in a direction facing the head carriage, the resilient part being fixed at one end ont

Abstract: A disk drive of the kind having a turntable for supporting a flexible magnetic disk thereon, a spindle extending centrally through the turntable for centering engagement in a first opening formed centrally in a sheet metal hub of the disk, and a drive pin arranged eccentrically of the turntable for driving engagement in a second opening formed eccentrically in the disk hub. For supporting the drive pin, a sheet metal drive pin support of approximately arcuate shape is mounted on the underside of the turntable for joint rotation therewith and has the drive pin erected on one end thereof so as to extend with clearance through an opening in the turntable. The drive pin support with the drive pin thereon is movable linearly relative to the turntable in a plane parallel to that of the turntable along a first notional line orthogonally intersecting a second notional line extending through the axes of the drive pin and the spindle.

Abstract: A disk drive for use with a flexible magnetic disk having a sheet metal hub with a central hole and an eccentric slot formed therein. The disk drive has a turntable on which the disk is to be placed for joint rotation therewith. The turntable has a spindle disposed centrally for centering engagement in the central hole in the disk, and a drive pin disposed eccentrically on the turntable for driving engagement in the eccentric slot. Erected on the free end of a lever which is pivotally mounted to the turntable, the drive pin is biased to travel substantially radially outwardly of the turntable so that the disk may be engaged by the spindle and the drive pin without looseness. Since the data storage disk when first loaded on the turntable rests slantingly thereon, with the drive pin butting endwise against the disk, until the drive pin becomes engaged in the disk slot with the rotation of the turntable, the support lever is formed to include a constricted neck portion intermediate the opposite ends thereof.

Abstract: A thrust ball-bearing in which a good lubrication is maintained for a long period of time and having a long service life. The bearing comprises a plurality of balls having a uniform diameter, a retainer which retains the balls, and two plates situated at either side of the retainer and rotatable relative to each other via the balls. The retainer has a thickness less than the diameter of the ball. A plurality of holes that retain each ball is provided on the retainer and a groove having a rectangular cross section is formed in a portion between two adjacent holes. An amount of grease applied to the ball is collected inside the groove and provided to the ball located on the downstream side of flowing grease without moving outwardly of the groove even if a centrifugal force generated by a rotation of the bearing is exerted.

Abstract: A pre-set variable passive element can prevent faulty insulation between itself and a conductive board. A cylindrical member extended higher than a adjusting member is made of ceramic around the adjusting member which is rotatably fitted for adjustment of the value of resistance of the pre-set variable resistor element, the forming of the cylindrical member being integrally formed with a main part also formed in a ceramic. The cylindrical member is fitted into an opening bored in a stator board mainly of a steel plate, and the pre-set variable resistor is fitted on the stator board. The adjusting member which is contacted by a contact, by which the value of resistance of the pre-set variable resistor element is determined, and an inside periphery of the opening free from any insulating treatment is securely insulated by the cylindrical member.

Abstract: A disk drive for use with a flexible magnetic disk having a sheet metal hub having a central hole and an eccentric slot formed therein. The disk drive has a turntable on which the disk is to be placed for joint rotation therewith. The turntable has a spindle disposed centrally for centering engagement in the central hole in the disk, and a drive pin disposed eccentrically on the turntable for driving engagement in the eccentric slot. Erected on the free end of a lever pivotally mounted to the turntable, the drive pin is movable substantially radially of the turntable. A magnetic member is also mounted to the free end of the lever for magnetically biasing the drive pin radially outwardly of the turntable so that the disk may be engaged by the spindle and the drive pin without looseness. For magnetically biasing the drive pin there is utilized a permanent magnet rotor which constitutes a part of a disk drive motor and which is mounted to the turntable for joint rotation therewith.

Abstract: A spindle motor able to reduce leaking of magnetic flux of an index magnet to a magnetic head of a disc apparatus. In an axial gap type spindle motor having a rotor case rotatably supported by a base plate, an index magnet is provided to a face of the rotor case opposite to the base plate. A hall device is provided in an open space between a plurality of coils arranged radially on the base plate at a position opposite to the index magnet. A magnetic flux forms a closed loop by passing through the rotor case, and thus leaking of magnetic flux to the outside is reduced.

Abstract: A stepping motor for driving a head carriage having a motor axis on which is provided a lead screw comprises a seat plate that forms a back end of the motor, said seat plate being provided with a projection that projects toward a radial direction of the motor axis. At the time of the alignment of a head and a disk, the stepping motor is rotated by rotating a jig which is engaged with the projection. Thus the stationary position of the head carriage along a direction of its movement is adjusted.

Abstract: A motor positioning method includes steps of: providing a frame of a disk drive apparatus having locating holes spaced apart from each other, the locating holes being located in accordance with a predetermined positional relationship between the locating holes and a target position; placing a positioning jig on a base surface, the positioning jig having a first connecting portion with a diameter corresponding to a reference opening at the target position and second connecting portions with diameters corresponding to respective ones of the locating holes, the second connecting portions and the first connecting portion being located in accordance with the positional relationship; placing the frame onto the positioning jig so that the second connecting portions are fitted into the locating holes; and placing a board having a drive motor, a shaft and the reference opening at the target position, onto the frame attached to the jig so that the first connecting portion is fitted into the reference opening, thus posi

Abstract: A connector device for electrically connecting an electronic component having a plurality of connection pins, each of the connection pins having a structure for distinguishing the polarity assigned to the pins, comprises a body provided with an insertion part adapted to accept the plurality of pins, an electrical contact member adapted to engage with the plurality of pins when the pins inserted into the connector have reached respective predetermined positions, and insertion prohibiting structure provided in correspondence to at least one of the connection pins so as to prevent the insertion of the pins to the predetermined positions when the pins are inserted the insertion part with a wrong polarity.

Abstract: A drive pin support mechanism for an apparatus for data transfer with a magnetic disk having a rigid hub of magnetic material attached centrally thereto, with the apparatus including an upstanding drive spindle for centering engagement in a central opening in the disk hub, a turntable rigidly mounted on the drive spindle and having a permanent magnet for attracting the disk hub and for holding the disk thereon, and a drive pin for driving engagement in an eccentric slot in the disk hub. The drive pin support mechanism includes a drive pin support spring fabricated from resilient sheet metal material and supported on the underside of the turntable for joint rotation therewith. The support spring is so configured as to permit the drive pin mounted thereon to slant in a direction opposite to the predetermined direction of rotation of the turntable.

Abstract: A rotary to linear converter is disclosed as adapted for transporting a magnetic transducer head from track to track on a magnetic disk in a disk drive. Included are an electric stepping motor coupled to a lead screw, and a head carriage engaged with the lead screw for linear travel in response to the rotation thereof. A pin is engaged with a helical groove of the lead screw. The pin is arranged in perpendicular to the lead screw. Consequently, even if distance between the lead screw and a guide rod of the head carriage deviates from a desired value, the pin is not displaced in the extending direction of the lead screw.