Abstract: A magnetically biased electromagnetic shuttering device for controlling the shutter blades of a camera. The device includes a yoke having a core and a coil, the coil being capable of receiving current which produces a first magnetic field existing inside and outside the core. A movable magnet is coupled to the shutter blades, has a second magnetic field and is positioned adjacent to the core so that the second magnetic field interacts with the first magnetic field. A magnet, separate from the yoke, produces a third magnetic field and is positioned adjacent to the movable magnet in order to influence the motion of the movable magnet and to provide controllable detents for the movable magnet.

Abstract: A motor for providing reciprocating motion comprises a stator defining an arcuate pole face and a flat pole face and an armature defining a complimentary arcuate pole face and flat pole face, where the armature rotates about a pivot internal to the structure of the armature in order to maintain a fixed air gap between the arcuate pole faces of the stator and the armature and a variable air gap between the flat pole faces of the stator and the armature.

Abstract: An optical deflector has a support. A movable plate is formed with a mirror for reflecting light from a light source. The mirror is formed on at least one surface of the movable plate. An elastic member couples the movable plate and the support to hold the movable plate in a deflectable manner. A driving coil is formed on at least one surface of the movable plate. A magnetic field producing means produces a magnetic field in a direction substantially parallel to the surface of the movable plate. The interaction between a current flow in the driving coil and a magnetic field produced by the magnetic field producing means causes elastic deformation of the elastic member, which, in turn, deflects the movable plate. A Hall element detects the deflection angle of deflection motion of the movable plate.

Abstract: A control system stabilizes the flexible body bending modes of a space, airborne, or ground-based system, while providing angular position control of an oscillating mass connected to a counter-oscillating counterbalance. The actuating mechanism uses two drive motors to exert torques on the mass and counterbalance, respectively, under the control of a feedback controller. The controller has a first control channel generating a first torque command signal for the first drive based on the angular position of the mass, and a second control channel generating a second torque command signal for the second drive based on the angular position of the counterbalance and a torque cross-feed signal from the first control channel. The second control channel includes a notch filter for removing input frequencies in a predetermined bandwidth about the frequency of the first torque command signal.

Abstract: A vibration generating mechanism includes first and second permanent magnets spaced from each other with the same magnetic poles opposed to each other, and an electromotive actuator for driving the first permanent magnet. The electromotive actuator moves the first permanent magnet periodically and reciprocatingly relative to the second permanent magnet to change the opposing area of the first and second permanent magnets thereby causing the second permanent magnet to vibrate relative to the first permanent magnet.

Abstract: The invention concerns a vibrator comprising an engagement face (11) which is adapted to engage a part of a body, and which is driven by an electric motor (18). The vibrator moreover comprises a housing (1) comprising a shaft (9) connected with the motor, and the vibrator has a frequency regulating device and an amplitude regulating device (2) for regulating the frequency and the amplitude, respectively, of the upward and downward movement of the engagement face. The vibrator is characterized in that the amplitude regulating device (2) comprises an inclined shaft (15) in extension of the shaft (9) connected with the motor, said inclined shaft being slidably mounted in a conversion element (14) having a through hole.

Abstract: The reciprocating valve actuation and control system includes a poppet valve moveable between a first and second position; a source of pressurized hydraulic fluid; a hydraulic actuator including an actuator piston coupled to the poppet valve and reciprocating between a first and second position responsive to flow of the pressurized hydraulic fluid to the hydraulic actuator; an electrically operated valve controlling flow of the pressurized hydraulic fluid to the actuator; and an engine computer that generates electrical pulses to control the electrically operated valve. The electrically operated valve preferably comprises a three path rotary latched magnetic motor actuating a rotary valve portion having a housing, a rotor, and a stator receiving and supplying hydraulic fluid pressure to the rotor, which alternately directs the hydraulic fluid pressure to the valve cylinder for opening of the valve, or to return to the engine oil sump, for closing the valve.

Abstract: A torque motor comprises a rotor having a pair of permanent magnet groups, and a pair of stator cores. Each magnet group includes a plurality of plate and rod-shaped permanent magnets arranged in a circumferential direction. The magnet groups are arranged asymmetrically with respect to a rotary axis of the rotor. That is, one magnet group is displaced one-half angle of the pitch angle of each permanent magnet from the symmetric position of the other magnet group with respect to the rotary axis of the rotor. Alternatively, the stator cores are arranged asymmetrically with respect to the rotary axis of the rotor so that a front end of one stator core is displaced from the symmetric position of a front end of the other stator core in the circumferential direction. A circular arc angle for one of the stator cores ends facing the rotor is greater than a circular arc angle for the other stator core facing the rotor. Accordingly, a range of a torque generating angle of the motor is increased.

Abstract: A permanent magnet D.C. torque motor has the stator mounted in cantilever from a base and nested in a cup-shaped rotor journalled for rotation on the base. The permanent magnets are disposed about the inner periphery of the rotor. The stator core has a plurality of radially outwardly directed webs with coils therearound and may be formed integrally as one-piece or laminated. The pole segments may be integrally formed with the web or attached as separate members. The pole segments have truncated cylindrical pole shoe surfaces forming radial air gaps with the rotor magnets. The pole segments extend axially and transversely beyond the webs. The axial pole segment extensions provide increased total flux for a given motor volume without an increase in ampere turns of electrical energization. The motor of the present invention is particularly suitable as an engine air throttle actuator.

Abstract: A low frequency vibrator has a stator member with a cylindrical, central chamber, a cylindrical, tubular liner of low friction, non-ferromagnetic material positioned in the chamber to form a bearing and a cylindrical, ferromagnetic, reciprocating piston slidably mounted in the liner. The stator has a pair of coils and a permanent magnet is positioned centrally in the reciprocating piston. A ferromagnetic flux conductor surrounds the coils and extends between opposite ends of the chamber. This structure creates a magnetic spring, having a spring constant K. The ratio of K to the mass M of the reciprocating member is made substantially equal to the square of a radian frequency in the operating frequency range of the vibrator.

Abstract: A torque motor includes an annular, cylindrically symmetric support base, and a plurality of electromagnet coils affixed to the support base at regular intervals around a cylindrical circumference of the support base. There is additionally an annular, generally cylindrical, rotationally movable rotor ring overlying the support base and having an inner surface, and a plurality of permanent magnets affixed to the inner surface of the rotor ring at regular intervals around a cylindrical circumference of the rotor ring. The number of permanent magnets is even and equal to the number of electromagnet coils, and the permanent magnets are arranged in alternating polarities around the circumference of the rotor ring. In a preferred form, there are six of each type of magnet, spaced equidistantly around the circumference of the respective rings.

Abstract: A linear vibration motor which includes a vibration system, an electromagnetic driver, a detection system, and a control system. The vibration system includes a driven member or reciprocator which is mounted to a magnetic member for reciprocating movement. The amplitude of the reciprocating movement varies as an inverse function of load on the motor. The electromagnetic driver includes a coil and drives the vibration system by applying an electromagnetic force to the magnetic member, the electromagnetic force being produced by a driving current flowing through the coil. The detection system detects at least one characteristic of the vibration system that is related to a characteristic frequency of the vibration system, and produces a feedback signal indicative of a value of the at least one characteristic.

Abstract: The invention provides an on-board electrical power generator for application on railway cars as a power supply for Electronically Controlled Pneumatic (ECP) brake equipment and other on-board electronic devices, such as an end of train unit. The generator unit can by operated by vehicle vibration when the train is moving, or by fluid pressure from the brake line when the train is stopped. The generator unit has a magnetic piston surrounded by a coil and is engaged on either end by diaphragm-spring combinations. This arrangement creates a mass-spring system in which the magnetic piston vibrates under external excitation. The oscillation of the magnetic piston as a result of vehicle movement allows interaction between the magnetic piston and a coil and thus generates electrical voltage across the coil as a result of vibration. The diaphragms of the diaphragm-spring combinations create two sealed chambers on the first and second ends of the generator which allows the piston to be actuated by fluid pressure.

Abstract: The present invention relates to a planar type electromagnetic actuator of two axis construction, having two movable plates (12A, 12B) with pivotal supports at right angles to each other. A pair of static magnetic field generating devices (4, 5) are arranged facing each other on either side of the movable plates (12A, 12B), and aligned with one diagonal direction of the movable plates (12A, 12B) so that a magnetic field acts on the movable plates (12A, 12B). A magnetic force due to the mutual action with a current flowing through drive coils (15A, 15B), acts on the movable plates (12A, 12B), to thus drive the movable plates (12A, 12B). As a result, the number of components for the magnetic field generating devices can be reduced, the construction of the electromagnetic actuator simplified, and construction costs reduced.

Abstract: A thermo-sensitive actuator capable of operating without the need of providing a temperature detector as a separate member. The actuator includes a stator made of a magnetic material to form a yoke. A rotor is rotatably provided in an opening provided in the stator. The actuator further includes pole pieces for magnetically connecting the stator and the rotor. A magnetic source is provided in any of the magnetic paths formed by the constituent elements. A thermo-sensitive magnetic material, which shows a change in magnetic characteristics, e.g. permeability, saturated magnetic flux density, or residual magnetic flux density, according to temperature, is provided in a part of the magnetic paths.

Abstract: A synchronous reciprocating electric machine includes a first magnet system having first and second opposing surfaces forming between them a gap, and a second magnet system mounted within the gap so as to be displaceable relative to the first magnet system along a line of travel through the gap. The the first magnet system is configured for generating a magnetic field, referred to as the "gap field", directed across the gap primarily perpendicular to the first surface. The second magnet system includes two magnetic elements configured to generate equal but opposite magnetic fields primarily perpendicular to the first surface. These magnetic elements are spaced from each other along the line of travel by a distance b, where b>0. One of magnet systems produces a non-alternating magnetic field and the other is a coil assembly for producing an operating magnetic field.

Abstract: An integrated device, used for selectively generating waking vibrations or sounds in alarm watches or in communications equipment such as cellullar or pager phones, is disclosed. In the device, first and second vibration members are set in a ring case and respectively generate waking vibrations and waking sounds. The second vibration member is made of a synthetic resin film, with two inner terminals being connected to both ends of a coil. A lead panel integrally extends from the edge of the second vibration member, thus being exposed to the outside of the device. Two outer terminals are provided on the outside end of the lead panel and are connected to the inner terminals through copper wires, thus connecting the coil to a PCB. The second vibration member, originally used for generating waking sounds, is thus used as a circuit board for the coil.

Abstract: The invention relates to a method and apparatus for wireless remote control. A transmitter (1) with no batteries receives its operating power from a generator (3) which produces electrical energy inductively upon turning or pressing an operating element (4) manually. The same operating element can also be used for determining the direction and degree of control.

Abstract: A rotary actuator has a ferromagnetic armature with at least one arcuate-shaped wall extending circumferentially at the perimeter of the armature. The stator has a pair of axially and circumferentially aligned axial walls, separated by an axial air gap, disposed radially outward of, and in relatively circumferentially advanced relationship to, each such arcuate-shaped wall. Current flow in an electromagnetic coil associated with the stator causes magnetic flux to pass from one axial wall of each pair, across an air gap, to the respective arcuate-shaped armature wall, through that wall, and across a radial air gap to the other axial wall of each pair. Each arcuate-shaped wall has a ferromagnetic characteristic that causes it to be positioned to increasingly circumferentially overlap the respective pair of axial walls as the magnetic flux increases. The actuator may include a rotary flow control valve, such as an EGR valve for an automotive engine.

Abstract: A method and apparatus for operating a positioning device for an adjustable device. The positioning device is mechanically actuated by a bearing connected to a pivotable armature that interacts magnetically with an electromagnet. The electromagnet is energized by current pulses generated by a computer program. The current pulses cause the air gap between the pivotable armature and the electromagnet to vary between open positions where the electromagnet is not magnetized, and a closed position where the electromagnet is magnetized. Several bearings and associated electromagnets may be arranged to operate the positioning device in one or more directions and at different torques and operating speeds for different directions of operation and different positions of adjustment.

Abstract: The present invention relates to a friction welding device for joining workpieces, preferably those of thermoplastic material, comprising a stationary support, an oscillating platform and a plurality of flexural rod-like members connecting said support and said platform and an electromagnetic drive motor for driving said platform in an orbital motion. According to the invention, the electromagnetic drive motor comprises electro-motor components as they are commercially available, i. e. a drum-type cylindrical rotor composed of laminated iron sheets, preferably of the squirrel-cage type and a stator having slots provided along its inner periphery, all these parts being cheaply available since they are mass products in manufacturing asynchronous motors.

Abstract: A rotary electromagnetic actuator comprises a rotatable shaft carrying a rotor which is rotatable relative to a stator. A magnetic circuit is set up which comprises the stator and the rotor, the reluctance of the magnetic circuit being dependent on the relative rotational orientation of the rotor and stator and decreasing in a particular direction of rotation such that the reluctance is a minimum at an equilibrium position to which the rotor is therefore biased. The rotor is selectively impelled to advance away from the equilibrium position, subsequently again becoming part of a magnetic circuit, the reluctance of which decreases in the direction of rotation to a minimum at an equilibrium position to which the rotor becomes biased. The actuator provides undirectional rotation for successive actuations at substantially uniform torque and is suitable for use in actuating rotary devices such as rotary valves.

Abstract: A vibratory structure and a method for controlling the natural frequency thereof are provided. The vibratory structure has an elastic member one end portion of which is fixed to a first support end, an inertial object for vibrating by the elastic force of the elastic member, a moving electrode attached integrally to the inertial object, an effective stiffness controlling electrode fixed to a second support end, and a power supplier for generating electric force between the moving electrode and the effective stiffness controlling electrode. The moving electrode and the effective stiffness controlling electrode are formed into a predetermined shape, so that the electric force varies linearly according to the displacement of the inertial object. Thus, the natural frequency of the vibratory structure is controlled by changing the voltage applied across the moving electrode and the effective stiffness controlling electrode.

Abstract: Disclosed is an AC electric motor with oscillating rotary output, a permanent magnet rotor having radially magnetized magnets, and feedback control of oscillation amplitude. Amplitude control is accomplished without a separate amplitude sensor by using an accurate model of the motor as a basis for calculation of amplitude from measurements of motor voltage and current. The motor has high efficiency, low inertia, and uses a relatively small volume of permanent magnet per unit power output.

Abstract: A reactionless momentum compensated payload positioner adapted to be mounted on a supporting body for providing momentum compensation of an oscillatory and scanning payload and for suppressing reactions in the supporting body to the torques that occur as an aiming angle of the payload is changed. The payload positioner includes a gimbal assembly having at least two axis of rotation including an elevation axis and an azimuth axis. A pair of reactionless drive module are provided for rotating the payload about both axes. Each reactionless drive module includes a housing, a main drive shaft connected to the payload, a DC electric motor for rotating the drive shaft, and a flywheel. The main drive shaft is freely rotatably suspended within the housing by main bearings and the flywheel is freely rotatably mounted to the main drive shaft by bearings. ?In operation, the flywheel counter rotates with respect to the main drive shaft.

Abstract: A thermo-sensitive actuator capable of operating without the need of providing a temperature detector as a separate member. The actuator includes a stator made of a magnetic material to form a yoke. A rotor is rotatably provided in an opening provided in the stator. The actuator further includes pole pieces for magnetically connecting the stator and the rotor. A magnetic source is provided in any of the magnetic paths formed by the constituent elements. A thermo-sensitive magnetic material, which shows a change in magnetic characteristics, e.g. permeability, saturated magnetic flux density, or residual magnetic flux density, according to temperature, is provided in a part of the magnetic paths.

Abstract: A linear oscillating motor capable of assuring a consistent and effective feedback control of keeping a constant oscillation amplitude with varying load conditions. The linear oscillating motor comprises an oscillator carrying a permanent magnet, and a stator with an electromagnet. The electromagnet is supplied with an electric power to develop an electromagnetic drive force of moving the oscillator in a linear direction relative to the stator. A spring is provided to apply a restoring force to the oscillator for providing a linear oscillating motion to the oscillator. A photo-sensor monitors the linear motion of the oscillator and outputs a signal to a reverse-point detector which determines right and left reverse points of the oscillator. A controller applies the electric power to the electromagnet at the drive points respectively defined subsequent in time to the reverse points and in a varying amount for keeping a constant oscillation amplitude of the oscillator.

Abstract: A device (1) for converting rotary movement into axial movement has a spindle (8), a spindle nut (5) surrounding the spindle (8), and a plurality of interposed rollers (7). Each of the rollers has a groove profile (72) corresponding to a thread (81) on the spindle (8), and roller grooves (71) corresponding to spindle grooves (51) formed on the interior of the spindle nut (5). The converter device is driven by a drive unit such as an electric motor (4), either via the elements spindle nut (5) and spindle (8) or, with an interposed connection element, via the rolling elements or rollers (7). The converter device has a reset device with a mechanical energy accumulator (21) and an energy delimiter (22). Energy transfer takes place from the electric motor (4) via the energy delimiter (22) to the energy accumulator (21) connected to a casing (3) or vice versa.

Abstract: A rotary actuator which carries magnetic read/write heads into engagement with a magnetic recording medium has a rotor which includes an arm, a pivot assembly and return path members extending from the pivot assembly. The stator includes a permanent magnet, a magnetic member and magnetic coils on the magnetic member. When the magnetic coils are energized, flux flowing through the magnetic member and the return path members aids or detracts from the magnetic flux generated by the permanent magnet.

Abstract: A ring rotor wherein two magnets of different polarities are disposed in an annular fashion, is supported free to rotate on a base. Two stator coils fixed on the base face these magnets inside of this rotor. Also provided are a switch fixed for selectively energizing these coils, and a mechanism for holding the ring rotor in a predetermined rotation position. Due to the use of magnets for the rotor, brushes are unnecessary, and the ring rotor can be held in a stop position by the holding mechanism.Througholes connecting the inside of the housing and the outside of the housing base are provided in a boss projecting from the base towards the inside of the housing. Grooves are formed from the opening position of the throughole in the base to the side walls of the housing. Bends are provided in these grooves. Leads running from outside into the housing are guided inside the housing via these grooves and througholes. Leads are fixed by filling the grooves and througholes with a filler.

Abstract: A ring rotor is supported free to rotate in a housing, and a plurality of magnets are provided on the inner circumference of the ring rotor having their N and S poles oriented alternately. A stator is fixed to the housing on the inner side of the ring rotor, this stator having a plurality of coils. A switch is provided in the energizing path of the coils, and a mechanism for stopping the ring rotor at a predetermined rotation position is also provided. When one of the coils is energized via the switch, the ring rotor is caused to rotate, and is then held by the stop mechanism. Since the coils are not energized after the operation, power is economized, and burning of the coils is prevented.

Abstract: A rocking motor comprises a coil wound around a hollow coil bobbin. A rotor is rotatably mounted at a position close to an end portion of the coil bobbin. The rotor has a center shaft and a permanent magnet and is magnetized with two poles such that the positions of the poles are located close to the coil and the magnetization angle is greater than 90 degrees but less than 180 degrees. The positions of the poles of the rotor and the coil are adjacent to one another so that a rotary torque can be efficiently obtained by a magnetic force generated by the coil. The rocking motor can generate a high power output with a relatively low power supply and its operational performance is not adversely affected by an external magnetic field.

Abstract: A direct drive robot motor may be used for the arms, legs, eyes and fingers of a robot. The motor comprises a rotor, having a permanent magnet, and a tubular arm portion, which is integral with the rotor and extends outwardly through a slot in a stator body. The stator body is wound with an aluminum coil and has a tubular extension to link it with the arm of another direct drive motor.

Abstract: A scanning device for projecting a light beam against a target having information contained thereon which is to be scanned by the light beam; and in particular relates to a compact laser scanning device, such as a bar code projecting a laser beam, and which device incorporates a drive component such as a scanning motor for oscillating a scanning element or mirror at a high rate of speed within a specified angular range so as to cause the light or laser beam which impinges against the information on the target to be rapidly swept across the information in a scanning sequence. In particular, the structure is directed to improving the linearity of the oscillatory or "dithering" motion imparted by the scanning motor to the scanning element or mirror. Also contemplated is a novel method of utilizing the "dithering" or oscillating motion of the scanning motor for effectuating an improvement in the quality of the scan by the scanning device.

Abstract: An objective lens driving device used in an optical recording and/or reproduction apparatus comprises a lens holder, elastic supporting members, a coil bobbin and a yoke. An objective lens is mounted in the lens holder. The elastic supporting members have one end attached to the lens holder and the other end attached to a mounting part. The elastic supporting members support the lens holder movably in a direction parallel to the optical axis of the objective lens and in a plane perpendicular to the optical axis. A coil for focusing and coils for tracking are wound on the coil bobbin. A magnet is mounted on the yoke, and the width of this magnet is selected so that flux from the magnet acts only on effective portions of the coils for tracking.

Abstract: The oscillating mass is integral with a toothed wheel which is engaged with pinions at the periphery of a plate. Many rotors at the periphery of the plate are located between sections of a peripheral, annular stator. The sections of the stator comprise cores and coils. It is thus possible with a simple construction of small thickness to obtain sufficient efficiency and power of the generator without considerable multiplication of the movement of the oscillating mass. The plate has a recess capable to receive a movement of an electronic watch of an existing caliber. The generator comprising the plate, the oscillating mass, the rotors and the stator constitutes an independent module capable to be assembled with a movement of an existing watch.

Abstract: Means and apparatus for use in a vibratory device such as an artide feeder. Said apparatus including a housing having changeable side plate selected from a group of side plates of different mass in order to allow mass adjustment of the artide feeder driving mass dependent on driven mass requirements. The vibratory device may also be associated with at least another vibratory device in either tandem or siamised Configurations by side plate selection.

Abstract: A rotary actuator utilizing a magnetically biased bearing. A magnetized rotor is held in close proximity to a ferromagnetic mount. The magnetic flux created by the magnetic rotor through the ferromagnetic mount creates a magnetic bias force on the rotor bearing surface. The rotary actuator with the magnetically biased bearing rotates a mounted mirror to direct a reading laser beam to act as a fine tracking actuator within an optical data storage system.

Abstract: A torque embodying an armature placed radially between a central bar and an external ferromagnetic tubular portion. The central bar is composed of two portions of the same cylinder diametrically opposite each other and having substantially equal angular amplitudes below 180.degree. and separated by generally parallel longitudinal flats. A radial permanent bar magnet is incorporated in the central bar between the cylinder portions. The armature has a winding formed from longitudinal strands connected by transverse strands and arranged into bundles within which all currents flow in the same direction at all times.

Abstract: A second torsional vibrator having an outer frame and a second torsional spring is formed on the outer side of a first torsional vibrator having a pair of torsional springs and a plate member (reflection mirror), with a second torsional vibrator being fixed by the fixed part. The resonant frequency for the first torsional vibrator is set higher than that for the second torsional vibrator. The outer frame in the second torsional vibrator is driven substantially at the resonant frequency of the first torsional vibrator by an electromagnetic or electrostatic force. As a result, it becomes possible to obtain a stable and large scanning angle by using only a small driving force.

Abstract: An electromagnetic oscillating system is disclosed and includes an electromagnet with at least two poles. Each of the poles carry at least one electric excitation winding for connection to an alternating electric field. A rotor is disposed between the poles and includes a shaft that is rotatably disposed within the bore of the electromagnetic windings. The shaft is hollow and has a torsional spring disposed therein. One end of the torsional spring is rigidly attached within the shaft, while the other end extends from the shaft and is rigidly fixed to a stationary point.

Abstract: A vibratory device operable as a two mass vibrating system comprising a base mass and a work member mass spring coupled and mounted on isolator springs and operating at a frequency approximating the natural frequency of the system. A multiple number of leaf springs inclined at an angle to the base and work member mounting plate provide a combination of torsional and vertical amplitude required to cause the conveying action of the work member. The exciter for the vibratory device is an AC powered multiple electromagnetic oscillator having a fixed redial air gap eliminating the possibility of self destruction by impact of the poles faces without limiting the amplitude of the vibratory device.

Abstract: A light quantity adjusting device is provided with a light blocking member for adjusting a quantity of light by moving the light blocking member and a drive source for driving the light blocking member. The drive source includes at least a rotor having a plurality of poles, a stator, a coil and a limiting part arranged to limit the rotation angle range of the rotor to an angle not exceeding 180 degrees. The drive source is arranged such that a cogging torque existing when the coil is not energized works over the whole rotation angle range to cause the rotor to rotate in one direction and, a coil torque generated when the coil is energized works over the whole rotation angle range to cause the rotor to rotate in the other direction. The peak of the coil torque is set to be obtainable within the rotation angle range, and a torque which is obtained by combining the cogging torque and the coil torque works to cause the rotor to rotate in the other direction.

Abstract: A device for providing angular displacement of an axis in a direction selected from the X or Y direction or rotational movement about the Z direction with respect to the axis. The device comprises a magnetic core element which produces a magnetic field and defines a Z axis. The core element is capable of displacement in the X and Y directions respectively, and also rotational movement about the Z axis. A coil device proximate the core element introduces a distortion force in the core element in at least one of the X and Y directions or about the Z axis as desired a mounting device suspends the core element with respect to the coil device to permit relative movement therebetween in response to the distortion force.

Abstract: In a light deflecting apparatus including a rotary polygon mirror in which a disc rotary polygon mirror is fixed to a shaft supported by a gas of a predetermined pressure. The rotary polygon mirror is fixed to the circumferential side of a shaft by direct engagement therewith, and compressed air is supplied to the thrust end surface of the rotary polygon mirror, to use the thrust end surface as a thrust bearing. Thereby, the rotary polygon mirror can be rotated with higher running accuracy.

Abstract: An optical scanner and beam printer using the optical scanner are disclosed in which the optical scanner includes a scanning element supporting a mirror surface, a support element for freely supporting at one end the scanning element and at another end a vibrating element, and a drive source for inducing vibrations in the vibrating element. The support element may be a shaft having two modes of elastic deformation upon vibration or a torsional spring which undergoes deformation upon vibration. Vibrations received by the vibrating element are applied to the scanning element by the support element to cause optical scanning movement by the scanning element.

Abstract: A galvanometer is shown, which includes a cylindrical magnetic rotor polarized into two essentially semi-cylindrical poles on opposite sides of its axis. Two coil portions are disposed on opposite sides of the rotor, separated by a plane of symmetry that is in essential alignment with the poles of the rotor at the center of its range of motion. The legs of each grouping of turns of each coil portion are disposed in a distribution beginning at a point corresponding to the radial surface of the bobbin on which the coil portion is wound, and extending continuously substantially to the plane of symmetry. The distribution may be lower in density at the plane of symmetry than spaced therefrom and may approximate an inverse cosine distribution. A rotor is shown that includes a thin-walled torque-bearing sleeve encircling at least a portion of the magnet and is joined to the output shaft and the magnet. A fastener anchors the bobbin to the shell to prevent relative rotation therebetween.

Abstract: A scanning device for projecting a light beam against a target having information contained thereon which is to be scanned by the light beam; and in particular relates to a compact laser scanning device, such as a bar code projecting a laser beam, and which device incorporates a drive component such as a scanning motor for oscillating a scanning element or mirror at a high rate of speed within a specified angular range so as to cause the light or laser beam which impinges against the information on the target to be rapidly swept across the information in a scanning sequence. In particular, the structure is directed to improving the linearity of the oscillatory or "dithering" motion imparted by the scanning motor to the scanning element or mirror. Also contemplated is a novel method of utilizing the "dithering" or oscillating motion of the scanning motor for effectuating an improvement in the quality of the scan by the scanning device.

Abstract: This invention discloses a magnetic bearing device comprising a rotary member rotatably supported on a supporting member through a magnetic bearing, a free oscillating member which is oscillatable almost coaxially with the rotary member and disposed at a position not being in contact with both supporting member and rotary member, magnetic coupling member for oscillating the free oscillating member and the rotary member together, and a damping member disposed between the free oscillating member and the supporting member.

Abstract: A permanent magnet brushless torque actuator is comprised of an electromagnetic core capable of generating an elongated toroidally shaped magnet flux field when energized. Outside the generally cylindrical coil is an outer housing with upper and lower end plates at each end. Mounted to the end plates and extending towards each other are stator pole pieces separated from its opposing pole piece by an air gap. A permanent magnet rotor is disposed in the air gap and mounted on a shaft which in turn is rotatably mounted in each of the end plates. The permanent magnet rotor comprises at least two permanent magnets, each covering an arcuate portion of the rotor and having opposite polarities. Energization of the coil with current in one direction magnetizes the pole pieces such that each of the two pole pieces attracts one of the magnets of the rotor and repels the other magnet of the rotor resulting in a torque generated by the output shaft.