Abstract: A transmitting device, for transmitting position detector signals, comprises a controller for processing signals on various kinds of data from an object of interest; a position detector that has a magnetic pole detecting portion and which detects position data on the object of interest; an up-down counter that counts in an ascending or descending order on the basis of two-phase output signals that are produced from the position detector in accordance with the change in the position of the object of interest; a converting circuit portion in which both the counter value as produced from the up-down counter or the change in the counter value per unit time and a magnetic pole position detection signal as produced from the magnetic pole detecting portion are converted to a serial signal; and a transmission path for transmitting the serial signal to the controller.

Abstract: In a brushless motor, its magnet unit is formed by laying on each other a first magnet made of a flexible bond magnet material which is anisotropic and a second magnet made of a flexible bond magnet material which is isotropic, and the second magnet is smaller in wall thickness than the first magnet, and is confronted with the stator and the magneto-electric conversion element.

Abstract: An ejecting mechanism for a disk cartridge includes an eject lever having a proximal end disposed in a cartridge accommodating chamber, the eject lever extending diagonally toward a cartridge-inserting port of the accommodating chamber, urging device for imparting a swinging bias in a cartridge-ejecting direction, an input pinion meshing with a rack disposed slidably on the eject lever, a braking device for applying a brake to the eject lever when the eject lever is swung in a direction of pushing out the cartridge from the accommodating chamber, a one-way rotating clutch for transmitting the rotation of the input pinion to the braking device, and a guide groove formed in the accommodating chamber in a direction intersecting with the eject lever, a portion of the eject lever being slidably engaged in the guide groove via the rack, so as to cause the rack to slide in conjunction with the swinging motion of the eject lever.

Abstract: Single convex lens element has a positive power in both the main and sub-scanning directions on the surface which is the closer to the surface to be scanned and which is anamorphic such that any section taken through a plane that is parallel to the central optical axis and which is normal to the main scanning direction provides a generally constant surface geometry along the length of that surface. This lens ensures not only the production of a good image plane and satisfactory f.theta. characteristics in the main scanning direction but also the effective correction of the curvature of the field in the sub-scanning direction.

Abstract: In a method of transmitting multiple serial signals, parallel signals are converted into serial signals by a plural number of parallel-to-serial converters contained in a transmitter, serial signals are converted into parallel signals by a plural number of serial-to-parallel converters contained in a receiver, and multiple serial signals are transmitted between the transmitter and the receiver through a channel. In the method, for data transmission, said plural number of parallel-to-serial converters and said plural number of serial-to-parallel converters are connected in series, and the format of the serial signals on the channel, the format for the parallel-to-serial converters located preceding to the channel, and the format for the serial-to-parallel converters located succeeding to the channel are the same formats. In this case, these formats may be of the start-stop synchronization type.

Abstract: An optical pickup device includes a light source irradiating a record medium with plural light spots of light emitted therefrom, a plurality of light detecting elelments to which reflected light of the light spots are guided, respectively, to adequately synthesize and compare outputs of said light detecting elements, thereby reading information recorded in tracks of the record medium, and detecting an tracking error and a focusing error, and a hologram element which splits light emitted from the light source into plural beams is disposed in an optical path between the light source and the record medium, said hologram element is split by a split line, said split line elongating in a direction perpendicular to a track of the medium on an optical axis, and a hologram pattern having a diffraction function which is substantially directed in the track direction is disposed on at least one side of said split line, thereby differentiating diffraction conditions on both sides of said split line from each other.

Abstract: A delay signal rising after the passage of a predetermined time from the rising or falling of a position signal is formed by means of a delay circuit. While an offset circuit is used for sequentially monitoring the size relation between an induced electromotive voltage and a coil neutral point voltage, an offset is applied to the induced electromotive voltage when a regular speed detection signal is output from a comparator at the time the induced electromotive voltage and the coil neutral point voltage cross each other so as to raise the induced electromotive voltage up to the vicinity of a supply voltage Vcc or otherwise lower the induced electromotive voltage up to the vicinity of the ground potential.

Abstract: A drive magnet unit is fixedly mounted on the inner cylindrical surface of the cylindrical portion of a rotor yoke which is fixedly mounted on a hub, in such a manner that the drive magnet unit confronts a stator core. The rotor yoke has an annular portion along its open end. The rotor yoke has a curved portion along the open end which forms a gap with the outer cylindrical surface of the drive magnet unit. The annular portion is sheared along its base, thus forming a shear plane. The inner surface of the bottom of the rotor yoke, and the inner cylindrical surface of the cylindrical portion of the rotor yoke form a right-angled portion with which the right-angled outer edge portion of the drive magnet unit is engaged. The peripheral surface of the right-angled portion defines a through-hole in the bottom which is engaged with the hub. The gap is filled with adhesive, to fixedly secure the drive magnet unit to the rotor yoke.

Abstract: A motor control system for individually feedback-controlling a plurality of servomotors includes: a plurality of motor drive devices for converting DC power into AC power to drive the servomotors; current detecting devices for detecting the current value of the AC current to feed it back to the motor drive devices; and an A/D converter for converting the output signals of the current detecting devices into a digital signal. The motor drive devices, current detecting devices and A/D converter are accommodated in a casing for a group of servomotors, and the output terminals of the current detecting devices in the casing are connected in parallel to the input terminal of the A/D converter, so that the A/D converter is used for all of the current detecting devices in the casing. The resultant motor control system is small in the number of components, and accordingly in the number of wiring conductors, and is simple in construction and accordingly in adjustment work.

Abstract: A polarizing beam splitter includes: an optically isotropic substrate; a layer of birefringent material formed on top of said optically isotropic substrate; and a periodic pattern of ridges and grooves formed on a surface of said optically isotropic substrate to make a grating; and a refractive index equal to either the refractive index of the birefringent material for ordinary light or the index for extraordinary light, said grooves being filled with the material.

Abstract: A magnet assembling device includes a rounding die into which a rectangular and flexible rubber magnet can be mounted in an annular manner; a die guide for guiding the rubber magnet mounted in the rounding die into a motor case; a push punch including a punching portion for inserting the rubber magnet mounted in the rounding die into the die guide and for pushing the rubber magnet out of the die guide into the motor case; and a magnetizing head for magnetizing the inner peripheral surface of the rubber magnet. The die guide is formed in a tapered shape such that the inside diameter dimension of the side thereof from which the rubber magnet is inserted is larger than the inside diameter dimension of the side thereof from which the rubber magnet is discharged.

Abstract: A motor having rotor has a good balance of inertia and a magnetic characteristic that match the specifications of the motor with which those rotors are to be used. A rare-earth containing iron-base resin-bonded magnet is molded from an iron-base magnetic powder containing a rare earth metal such as neodymium and praseodymium in powder, a thermoplastic or thermosetting resin and additive. A density and magnetic characteristic is proportionally changed by adjusting a mixing ratio of a filler powder. Specifically, when a mixing ratio of filler powder containing tungsten having a density 19.1 g/cm.sup.3 is in 13 vol % is injected, or a mixing ratio of alloy powder containing tungsten an nickel, or tungsten and chromium having a density 10.5 g/cm.sup.3 is compression-mold, its magnetic flux assume the same value as those of compression-molded Sm--Co magnets.

Abstract: A small electric motor includes a first stator unit including a first outside stator, a first inside stator, and a coil between the first outside stator and the first inside stator; and a second stator unit including a second outside stator, a second inside stator, and a coil between the second outside stator and the second inside stator, in such a manner that the first and second stator units are set one on another in such a manner that the first and second inside stators are positioned between the first and second outside stators. In the motor, the first stator unit has a first holding section which is adapted to position the second inside stator while the second stator unit has a second holding section which is adapted to position the first inside stator.

Abstract: A brushless motor speed detecting apparatus includes a stator having three-phase driving coils which are energized reciprocally in the positive and negative directions, a rotor having magnetic poles, three position detectors for obtaining three-phase output signals corresponding to the rotation of the rotor, a first synthesizing circuit for synthesizing the output signals of the three position detectors, mode switching circuit for forming an energizing mode switching signal according to the output signal of the first synthesizing circuit, a driving circuit for supplying currents to the driving coils by switching an energizing mode from a first energizing mode to a second energizing and vice versa according to the output signal of the mode switching circuit, and a second synthesizing circuit for synthesizing a speed signal by detecting in the non-energizing section of the first energizing mode the induced electromotive voltages generated in the driving coils as the rotor rotates to base the synthesis of the sp

Abstract: In an electric motor, its motor frame has a shaft hole, a shaft is fitted in the shaft hole in such a manner that its one end potion is in the shaft hole while the other end portion is extended outside the motor frame. The motor frame includes a bearing-receiving portion extended therefrom in such a manner that the bearing-receiving portion confronts with the inner race of a rolling bearing fitted on the end portion of the shaft, and has a wall surface which merges with the wall surface of the shaft hole. The shaft has a groove which is covered by a part of the inner cylindrical surface of the inner race of the ball bearing and by the wall surface of the protruded portion. The inner raced is fixedly secured to the shaft with adhesive.

Abstract: A tracking error signal and a focus error signal can be obtained with those components of the light (plus and minus first-order light) which have been diffracted by a hologram device whereas the undiffracted zero-order light component is for the sole purpose of producing RF signals. As a result, RF signals can be detected without using a segmented photodetector while insuring that output signals of a constant intensity are produced even if there are changes in the spot diameter and position. In addition, any aberrations that are caused by an half-mirror are corrected by optics that is provided in the optical path connecting the half-mirror and the light-receiving elements of a photodetector and this insures that even if an objective lens moves, detection spots on the individual light-receiving elements will move on the latter without causing any offset errors.

Abstract: The magnetic pole 16b for positional detection is attached to the magnetic pole 16a for driving of the rotor magnet 16 at a position shifted from the magnetic center C of the magnetic pole for driving by an electrical angle of about 30.degree.. Due to the foregoing, the magnetic detector for driving is used as a magnetic detector for positional detection, so that the position detecting signal "c" can be obtained in a good condition. Therefore, it is unnecessary to provide a magnetic detector and a magnet piece which are conventionally used, so that the cost can be reduced, and it is also unnecessary to attach the magnet piece and the magnetic detector onto the base board. Accordingly, the manufacturing cost can be reduced, and further it is not required to maintain a space for installing the magnetic detector and the wiring thereof. In this way, it is possible to reduce the dimensions of the motor.

Abstract: A magnetic card reader includes a first multi-channel magnetic head for reading signals from a magnetic card which inserted in a first direction, a second multi-channel magnetic head for reading signals from a magnetic head which is inserted in a second direction, a plurality of switching circuits for delivering signals supplied from the first multi-channel magnetic head and the second multi-channel magnetic head at respective channels thereof after switching each set of common channels of the first and second multi-channel magnetic heads, a plurality of amplifier circuits for amplifying output signals from the plurality of switching circuits, respectively, and a decision circuit for determining the direction of insertion of the magnetic cards on the basis of the output signals from the switching circuits and for selectively operating the switching circuits so as to deliver output signals associated with the direction of insertion of the magnetic cards.

Abstract: A small motor includes a rotor fastened to a rotor shaft; a drive magnet disposed facing to the rotor; and bearings for rotatably supporting the rotor shaft with the rotor fastened thereto, wherein a magnetization pattern of the magnet is shaped in such a manner that magnetic forces contributing to the rotation drive of the rotor are balanced, and magnetic forces contributing to the rotor core attraction are unbalanced, thereby biasing the rotor shaft in fixed directions within the bearings.

Abstract: A blank is formed of a sintered alloy by sintering a mixture of powdered materials including powdered aluminum, and at least one of powdered silicon, powdered magnesium, and powdered chromium. This blank, being made of the sintered body, can be molded into a shape close to the final shape of a rotary polygon mirror. For example, a mirror surface can be molded into a desired shape in advance. Therefore, the final product of the rotary polygon mirror can be obtained with ease by subjecting the blank to a simple finishing process by cutting.