Abstract: A stepper motor includes a stator with magnetic poles extending radially outward from a central core to form segments of an outer stator surface, an armature ring fitting loosely over the stator, and a rotor with a drive plate rotationally driven by rollers extending from the armature ring into apertures in the drive plate. Current is supplied, according to a sequence, through coils surrounding each magnetic pole, so that the armature ring, being sequentially attracted to adjacent magnetic poles, moves around the stator with a modified orbital motion including an orbital motion, in which the ring is translated around a circular path, and a rotational motion. The stepper motor may also include a stationary cam plate with a number of peripheral notches, into which the rollers are moved individually by the orbital motion.

Abstract: An eccentric-motion motor for driving a utilization mechanism includes a stator defining a closed surface pathway, an armature composed of a permanent magnet rollably disposed on the closed surface pathway, a series of electromagnetic elements disposed in the stator along the closed surface pathway, circuitry for successively energizing the electromagnetic elements to cause them to attract and/or repel the armature so that it rolls along the closed surface pathway, and a coupler mechanism for coupling the armature to the utilization mechanism so that as the armature is caused to roll, the utilization mechanism is powered by the operation of the motor.

Abstract: An improved motor apparatus includes five motor coils which are connected with a stator and are sequentially energizeable to cause a rotor to nutate and rotate relative to the stator. Control circuitry includes an upper transistor and a lower transistor which are connected with opposite ends of a motor coil. The upper transistor is rendered nonconducting and current is conducted from one end of the motor coil through the lower transistor back to the motor coil to maintain the motor coil energized. A holding circuit is effective to energize one of the coils to maintain gear teeth on the stator and rotor in meshing engagement to hold the rotor against movement to relative to the stator. Annular rim surface areas on the stator and rotor are maintained in abutting engagement during nutation and rotation of the rotor relative to the stator and during holding of the rotor stationary with the gear teeth in meshing engagement.

Abstract: A step motor comprising two sets of annularly arranged electromagnets and which are disposed in left and right frame bodies respectively in bilateral symmetry, a wobble disc of magnetic body arranged between the sets of electromagnets, a supporting shaft which is pivotally coupled to the center of the light surface of the wobble disc and fixedly coupled to a bearing portion at the center of the right frame body, an output shaft which is fixedly coupled to the center of the left surface of the wobble disc by way of a universal joint and rotatably supported by a bearing portion at the center of the left frame body, a crown gear fixedly arranged on the magnetically permeable armatures of the right set of electromagnets and a crown gear fixedly arranged on the right surface of the wobble disc at the outer circumferential portion thereof which confronts the crown gear on the right set of electromagnets and has teeth different in number from those of the crown gear.

Abstract: An eccentric-motion motor for driving a utilization mechanism includes a stator defining a closed surface pathway, an armature composed of a permanent magnet rollably disposed on the closed surface pathway, a series of electromagnetic elements disposed in the stator along the closed surface pathway, circuitry for successively energizing the electromagnetic elements to cause them to attract and/or repel the armature so that it rolls along the closed surface pathway, and a coupler mechanism for coupling the armature to the utilization mechanism so that as the armature is caused to roll, the utilization mechanism is powered by the operation of the motor.

Abstract: An electrostatic motor comprising a stator and a rotor, one of which is equipped with a plurality of lands to which a voltage is sequentially applied. The other of the stator and rotor is made of conductive material. Rolling contact is established between the stator and rotor along at least one line of contact. The rolling contact is controlled to repetitive first and second paths along first and second surfaces of the stator and rotor, respectively, in which the lengths of the first and second paths are different. Embodiments include a cylindrical motor, a flexible disk motor and a conical motor.

Abstract: In an electromagnetic actuator for moving an object, a plurality of electromagnetic circuits is provided to produce a moving magnetic field in a substrate. There is disposed a flexible resilient plate wholly or partially made of a magnetic material. When the electromagnetic circuits impart a magnetic force to the magnetic material to produce a traveling wave in the flexible resilient plate. Also, a magnetic fluid may be disposed on the substrate and the flexible resilient plate be disposed in close contact with the surface of the magnetic fluid.

Abstract: A plurality of identical modules are serially connected together with each module including a base plate and a top plate interconnected by a universal joint assembly so that the top plate is adapted to pivotally nutate around the base plate to describe a cone in space. An array of twenty-four electromagnets, sequentially energized in sets of three, are arranged in a ring around the periphery of the base plate. Selective energization of the eight sets of electromagnets causes the rim of the top plate to be magnetically attracted to the energized electromagnets. The tilt of the top pivot plate is detected and controlled over a range of 360.degree., thus permitting a series string of modules to assume any desired elongated configuration.

Abstract: A microfabricated, harmonic side-drive "wobble" type micromotor exhibiting increased torque output without the need for air levitation or for insulation on the rotor. Stator pieces are arranged about a circular space. In the center of that space is a bearing. An annular rotor in the space, about the bearing, has an inner surface always in rolling contact with the bearing. The outer surface of the rotor is separated from the stator by an air gap.

Abstract: An electric motor comprises a plurality of electromagnets arranged annularly in parallel, an electric switching circuit connected to each electromagnet, an iron cylinder arranged inside the electromagnets and having peripheral surface to be attracted partially arbitrarily by part of the electromagnets, a main axle positioned at the center of the iron cylinder and coaxially arranged with an axial core of the iron cylinder via bearings, and eccentric axles provided at both ends of the main axle so that the eccentric axles are arranged in accord with the center of the electromagnets to define a power generating axle.

Abstract: The problem of providing a dual redundant load path which is not vulnerable to a single point failure at the output of a motor shaft is solved by a dual redundant load path motor system, particularly for use in aircraft actuation systems. A motor (22) has a rotor (34) extending entirely therethrough to define first and second output drives (38 and 40) at opposite ends (34a and 34b) of the rotor. First and second output shafts (46 and 48) are coupled to the opposite ends of the rotor. The output shafts are located at a common end of the motor, and one of the output shafts (48) is coupled through a connecting shaft (68) to the end of the rotor at the opposite end of the motor. The connecting shaft runs generally parallel to the rotor.

Abstract: A linear actuator has a screw threaded shaft mounted so that it is restrained from rotational movement, a cage is mounted in sliding relationship on the shaft and an internally threaded member is mounted at one end of the cage in a spherical bearing. The threadform of the internally threaded member is similar to that of the shaft but of larger diameter. The internally threaded member has a skirt formation which extends towards the other end of the cage, a circumferential portion of the skirt formation being made of ferromagnetic material.

Abstract: A trochoidal speed reduction mechanism forms an integral part of the stator and rotor of an electric motor so that a slow-speed high-torque output is produced without having any high speed rotating component in the motor. A rotor has an epitrochoidal contour with a predetermined number of lobes. Positioned around the rotor are two non-rotating orbiting stator-rings, phased 180 degrees apart, each provided with a number of rollers equal to the number of lobes on the rotor plus one. The rollers are rotatably mounted on the inner surface of the stator-ring and are in continuous contact with the epitrochoidal contour of the shaft rotor. The non-rotating orbital movement of the stator-rings is produced by magnetic forces from a series of stator windings arranged as magnetic poles around the stator-rings. This action causes the rotor to rotate at a speed equal to the orbiting speed of the stator-rings divided by the built-in speed reduction ratio.

Abstract: A rotor, rotatably coupled to an output shaft, is slidable axially along the shaft, the rotor and its coupling being biased axially out of engagement with a stator into engagement with a hand wheel to effect rotational coupling of the hand wheel to the output shaft. Electrical energization of the motor attracts the rotor to the stator, axially sliding the rotor and its coupling against the bias to automatically uncouple the rotary connection with the hand wheel, and to effect a motor driven coupling with the output shaft.

Abstract: A rolling rotor motor/compressor is made with a stator and both an inner and an outer rotor which serve to mechanically balance the device. The device can be configured to be a single compressor, two compressors, staged compressors as well as functioning as a motor. In the preferred embodiment the rotors are restricted to an orbiting movement.

Abstract: A magnetically driven motor includes an output shaft, a magnetic conical plate, a stationary guide, and at least three electromagnets. The output shaft is supported to be rotatable about a predetermined central line. The magnetic conical plate has a vertex on the predetermined central line, is rotatable together with the output shaft about the predetermined central line, is swingably supported to be inclined with respect to the predetermined central line, and has a predetermined peripheral length. The stationary guide has the predetermined central line as an axis, has a vertex angle slightly smaller than a vertex angle of the conical plate, has an annular guide surface corresponding to part of a conical surface of the conical plate, and is adapted such that a peripheral portion of the conical plate is swingable along the guide surface. The guide surface of the stationary guide has a peripheral length larger than that of the conical plate.

Abstract: A driving apparatus for a vertical rolling mill comprises a vertical electric motor mounted on a frame which has a hollow rotary shaft therein supported by a bearing and surrounding a portion of an intermediate shaft. The upper end of the intermediate shaft extends through the hollow rotary shaft and connects to a first universal joint disposed axially above the motor, and which engages the upper end of the hollow rotary shaft. The torque of the hollow rotary shaft is transmitted to the vertical roll through the first universal joint of the intermediate shaft, and a second universal joint.

Abstract: A linear actuator constructed so as to convert deformation movements of a plurality of electrostrictive elements to a reciprocating movement of an output shaft thereof. The linear actuator comprises a planetary driving unit adapted to be driven by a plurality of electrostrictive elements in a casing body thereof, a precessional driving unit adapted to be driven by a plurality of electrostrictive elements therein a contact ring connected interlockingly to both the planetary driving unit and the precessional driving unit therein and the output shaft engaged loosely to the interior surface of the contact ring and supported reciprocatively by the casing body. The voltages applied to the electrostrictive elements are controlled so as for the contact ring to be driven to perform a planetary movement with being pressed onto the output shaft and to be driven to perform a precessional movement by the precessional driving unit.

Abstract: In accordance with the invention the magnetic friction force is overcome by a rolling motion whereby there is physical contact between the field magnets and the core. As experiments show, reversal of magnetic flux polarity on and in a ferromagnetic object was 14 times less difficult to realize by such rolling motion. Because full contact is realized between field magnets and winding cores, a greater flux density is produced by the magnetic circuit. The above concept introduces a whole new breed of distinctly different rolling motion electricity generators.

Abstract: A vibration generator (50) is disclosed for generating vibration energy. A magnetically attractable mass (98) is loosely disposed within a substantially cylindrical cavity of a housing (54). An array of electromagnets (60-90) are circumferentially spaced around the housing cavity. The electromagnets (60-90) are sequentially energized in a predetermined sequence to magnetically attract the loosely disposed mass (98) toward an energized electromagnet thereby causing the magnetically attractable mass (98) to orbit around the array of electromagnets imparting centrifugal force to housing (54) which in turn generates vibration energy.

Abstract: A geared motor comprising: an output shaft rotatably received in a housing; a sun gear securely supported on the output shaft in the housing and having a plurality of external teeth; a ring gear housed in the housing and having a plurality of internal teeth meshed with the external teeth of the sun gear, and the internal teeth of the ring gear having a pitch circle larger than that of the external teeth of the sun gear and being larger in number than the external teeth of the sun gear; supporting means for supporting the ring gear in such manner that the center axis of the ring gear is eccentrically revolvable with respect to the axis of rotation of the output shaft and the ring gear is prevented from being rotated about its center axis; and drive means for generating electromagnetic forces one group of which has a plurality of force directions radially inwardly directed and the other group of which has a plurality of force directions radially outwardly directed, the different groups being circumferentially s

Abstract: In a vibration wave motor, a plurality of electrostrictive elements are phase-differentially arranged or polarized on a ring-shaped vibration member having a thickness which increases as it radially goes from a center to an outer circumference, periodic voltages are applied to the electrostrictive elements to generate a travelling vibration wave in the vibration member, and a movable member press-contacted to the vibration member is friction-driven by the travelling vibration wave.

Abstract: This invention relates to an improvement in a stepping motor composed of a stator housing containing annularly arranged electromagnets or coils with pole pieces and a magnetically conducting rotor composed of a flexible membrane solidly connected to an annular armature plate and connected to a drive shaft axially supported within the stator housing, the rotor being provided at its periphery with a toothed rim, the improvement comprising, in addition to the rotor (5), a second rotor (11) mounted on the drive shaft (3) and being composed of a flexible membrane (11') including a ring (9) provided with a toothed rim (10) conencted to the membrane (11'), the toothed rim (10) corresponding to a detent toothed rim (13) fixed to the stator housing (2), and the rotor (11) being so actuated by an electronically controlled indexing coil (15) located between the electromagnets or coils (4) that the rotor (11) is indexed or fixed in place according to the pitch of the detent toothed rim (13).

Abstract: An actuator for rotating an output member, having an epicyclic transmission adapted to rotate the output member in response to the motion of a rotor which contains a plurality of radial projections which interact with a stator or non-rotating portion of the actuator to produce a rotating tangential force vector directed substantially perpendicular to the radial projections.

Abstract: An electromagnetic diaphragm disk actuator is both easily driven and posiely held in its desired controllable relationship. The actuator includes a stator having a driving rim with a driving tooth system, a holding rim spaced axially away from the stator with a holding tooth system, a plurality of pairs of electromagnets in the stator and a rotor connected to a drive shaft having a magnetically attractable diaphragm with cooperating driving and holding tooth systems positioned around the circumferential edge and on opposite sides thereof lying between the stator and the holding rim. The diaphragm is positioned between the driving rim and holding rim such that the engagement points of the driving and holding tooth systems deform the diaphragm to the point that it develops an apex generally defined by the axis between the points of engagement of the holding tooth system and such axis is displaced 90.degree. relative to the axis formed by the engagement points of the driving tooth systems.

Abstract: A planocentric gear drive has an eccentrically floating driving gear for simultaneously engaging a stator gear and a rotatable output gear to rotate the output gear through relatively small angular increments. The stator and output gears have different numbers of teeth and are mounted coaxially for engaging the driving gear on a common axial line of contact wherein the stator and output gear teeth are in local axial alignment at the line of contact. The driving gear is attracted into meshing engagement with the stator and output gears by a circumferentially arranged plurality of electromagnets energizable in sequence to rotate the driving gear eccentrically in steps about the stator and output gears. During this eccentric rotation, the common axial line of contact revolves in steps about the stator and output gears, with the output gear rotating through small angular increments to permit the stator and output gear teeth to remain in axial alignment at the revolving line of contact.

Abstract: A digital stepping motor having a rigid tubular rotor arranged within a stator, in a housing, the stator having an arrangement of spline teeth adjacent one end thereof on a portion of the housing. The rotor has an array of spline teeth disposed at one end thereof, and a deflectable diaphragm at the other end thereof. The deflectable diaphragm is fixedly attached to an output shaft. The tubular rotor has an axis of rotation which is slightly skewed with respect to the axis of rotation of the output shaft during energization of the motor when the rotor is attracted to the stator. The stator comprises a plurality of equi-angularly spaced coils, the sequential energization of which causes sequential circumferential engagement of corresponding external and internal spline teeth between the rotor and the spline teeth on the end cap, creating an orbiting motion within the rotor, and a subsequent rotation of the output shaft.

Abstract: An electric motor or actuator having a housing and a stator mounted to the housing about a central axis. The actuator includes a rotor that is mounted within the housing in surrounding relationship to the stator for moving in an orbiting manner with respect to the stator poles in response to the magnetic force. The rotor has an axis that is eccentrically positioned from the central axis by a distance e.sub.1 and further includes a double eccentric that is mounted in rotating, surrounding relationship to the rotor and drivingly coupled thereto for transmitting the motion of the rotor to a ring gear. A stationary gear is attached to the housing and is mounted in surrounding relationship to the ring gear. The stationary gear includes a set of gear teeth which react with a coacting set of gear teeth on the ring gear, thus causing the ring gear to turn in response thereto.

Abstract: An electrically operated pulse motor having a stator and a rotor mounted within a chassis, the ends of the shaft of the rotor having been mounted in a pair of sleeves joined to the chassis, the inner diameter of the sleeves being larger than the diameter of the ends of the rotor shaft. The ends are connected with a pair of projecting semi-axles (axle shafts) of the rotor that are eccentric in relation to the shaft of the rotor and of a larger size than the aforementioned difference between the diameter of the rotor shaft and the inner diameter of the sleeve, the eccentricity between the projecting semi-axles and the rotor shaft being absorbed by means of the interposition of elastic couplings that change their shape during the operation of the motor.

Abstract: A rotor for a nutating motor has an annular cavity formed in one face thereof, which cavity receives a helically wound ring of magnetically permeable material.A gate valve operator assembly couples the hollow output shaft of a nutating motor to a valve stem, which axially moves within the hollow output shaft. An internally threaded spindle, or stem nut, is rotatably mounted to engage the externally threaded valve stem. The spindle and the hollow motor shaft are coupled together by means of a tab engaging a correspondingly formed notch. Axial movement of the spindle is prevented by means of a flanged radially extending circumferential rim formed as part of the spindle.

Abstract: A constant velocity coupling joint provides rotary motion to an output shaft of a nutating motor or shaft driven by a nutating member. A nutating plate is supported by the coupling and the nutating motion of the plate is transformed to rotary motion of the output shaft. The coupling includes a plurality of balls which are mounted in slots formed between a radially extending coupling plate fixed to the shaft and the nutating rotor member. The balls are held in position by a pair of thrust spacers positioned on each side of the coupling plate. The thrust spacers also provide rolling support for the nutating plate.

Abstract: Synchronous motor wherein an eccentric piece (6) mounted on the shaft (5) cooperates with a ball joint of which the outer cage is an integral part of the surface of the rotor (21) to maintain a predetermined tilting of the axis (0'0) of the rotor with respect to that of the stator. Application to the making of step-by-step motors.

Abstract: An electric motor having a low speed shaft that rotates at a speed much slower than the speed of a high speed shaft comprises a stator having a cylindrical bore with a longitudinal axis and a rotor that carries the low speed shaft and rotates in the bore eccentrically about the axis so that there is contact and no magnetic gap between a relatively small portion of the rotor periphery and the periphery of the bore. A magnetic field, rotating at the speed of the high speed shaft, is applied to the periphery of the bore. The field has longitudinally extending magnetic field components of opposite polarity so that around approximately 180.degree. of the bore the field extends in a first direction, while around the other 180.degree. of the bore the field extends in the opposite direction. The rotor includes permanent magnet pole faces at opposite ends of the bore.

Abstract: Speed capability of a rotary stepping motor of the harmonic drive type is markedly increased by providing a stiffer, i.e. harder to radially deflect, structure of its rotor. Elimination of magnetically permeable bridging material as heretofore employed is made possible also in an alternate construction. Basically, thickness of a flexrotor or flexspline wall is made greater than hitherto relative to its outside diameter to provide a stiffness insuring efficient operation at increased natural or resonant frequency. Higher capability of the thicker-stiffer flexspline to maintain its sinusoidal shape during operation results in less tooth wear and increased efficiency over a longer operating life. When concentric ring bridging is incorporated, its total wall-to-outside-diameter ratio thickness is advantageously substantially that of the novel flexrotor or flexspline itself to obtain higher step rates efficiently.

Abstract: This invention relates to an improvement in a stepping motor, comprising a stator housing with electromagnets being annularly positioned therein, a flexible membrane rotatably mounted over said electromagnets on a bearing block shaft, said shaft being axially positioned within the stator housing, said membrane being a magnetically-conducting annular disc, adapted to act as a rotor, the improvement comprising race means whereby the membrane is prestressed on the side facing away from the electromagnets by pressing and its conically deformed by an amount coordinated to the step size and holding moment of the stepping motor, and including contact surface means corresponding with the race means on the one hand, and with the stator housing on the other hand, said surface means being equivalent at the upper side and the underside of the membrane.

Abstract: A method and a circuit arrangement for driving a two co-ordinate mechanical oscillator with the aid of a deformed rotating field of forces defined by a plurality of exciting and pick-up components. The power dissipation of the employed circuits is kept at a low level by operating the oscillator near the mechanical resonance frequency. The exciting signals are achieved by comparing phase shifted electrical signals derived from the mechanical motion of the oscillator in a first pick-up component with the undisplaced signals of the second directional component and by supplying the difference signal obtained therefrom to the second exciting components of the oscillator. This is continued to the next adjacent components until the ring is closed.

Abstract: This device uses a piezoelectric crystal for converting electrical energy into mechanical vibrations which are transmitted to a dental workpiece for use in cleaning teeth. The device includes a front cap having flats which engage flats on the tip base attached to the dental workpiece and allows dental workpieces to be interchanged. The device includes a tie rod disposed within the tubular crystal around which water circulates between the tie rod and the tubular crystal. Axial bores allow passage of the water to the tip of the workpiece to wash away debris on the teeth during cleaning.

Abstract: Surface acoustic wave devices having broadband characteristics with a desired transfer efficiency of less than unity at a desired center frequency are described, the devices incorporate a multistrip coupler array of a predetermined number N of conductive strips disposed on a piezoelectric substrate which is capable of supporting two tracks of approximately equal widths of propagating surface acoustic wave energy, the array having a tapping portion in one of the tracks and an approximately equal length launching portion in the other of the tracks for launching only a portion of the energy incident on the tapping portion, the strip periods p.sub.1 and p.sub.2 of the two portions being different and the ratio of p.sub.1 /p.sub.2, in conjunction with N, provides the desired characteristic.

Abstract: An electromechanical filter, e.g. two duals, in which undesired resonances are damped out. A special choice of the damping material leads to a substantial improvement.

Abstract: An electrically driven tuning fork of the piezoelectric type, electromagnetic type or the like for use in electrical and electronic equipment which includes a tuning fork vibrator and electrical elements for driving the tuning fork vibrator. The two-pronged tuning fork vibrator has a pair of rectangular projections integrally formed with the prongs on corresponding side edges of the said prongs at one side of the tuning fork, excepting opposite end portions of the prongs adjacent to the node and in same embodiments, both the mode and antinode of the fundamental harmonic oscillation of the tuning fork for suppressing undesirable oscillation other than the fundamental harmonic oscillation of the tuning fork. Electrical elements are affixed onto the outer or inner surfaces of the prongs.

Abstract: A transducer assembly in which a transducer unit of a piezoelectric material which is rigidly held between a rear member and a front member, both of which are made to vibrate upon energizing the piezoelectric material. Inductive elements comprising copper conductors wound about iron cores and utilized in the tuning of the transducer assembly are rigidly connected to one or both of the members and may also be connected to the transducer unit itself to serve as a portion of the inertial mass which imparts a mechanical vibrational characteristic to the transducer assembly. In one embodiment of the invention, the rear member is provided with a void wherein there is nested an inductor having an inertia similar to that of the material removed from the rear member in forming the void.

Abstract: An acoustic transducer having a piezoelectric element secured to a conical diaphragm with the piezoelectric element forming part of a relaxation oscillator circuit. The piezoelectric element performs the dual function of firstly developing acoustic energy and transferring such energy to the diaphragm and secondly functioning as an electronic component in the oscillator circuit by operating as a frequency determining capacitor in such circuit. The diaphragm and the piezoelectric element are enclosed in a housing. Portions of the housing are deformed and penetrate the base of the diaphragm for securing the diaphragm to the housing. A post integral with the housing extends inwardly from the base toward the apex of the diaphragm and one end of the post is disposed adjacent the apex to prevent collapse of the diaphragm.

Abstract: The ultrasonic wave generator incorporates an ultrasonic-frequency vibratory member of cylindrical shape from which ultrasonic waves are produced, and the vibratory member is securely connected of its outer cylindrical surface to the mechanical vibration output end of a metallic block amplifier member which in turn is connected to an ultrasonic electromechanical transducer of the piezoelectric type, etc. The cylindrically shaped vibratory member effects a motion of flexural vibrations in the radial direction throughout its extensive areas, producing large-amplitude ultrasonic waves.

Abstract: Three different embodiments of the ultrasensitive differential point contact relay configuration of this invention are disclosed. The first or basic embodiment is particularly suited for use in intrusion detection systems or as a strain gauge/accelerometer and the like. The second embodiment is particularly suited for use as an ultrasensitive electrically actuated relay and the like. The third embodiment performs the function of an ultrasensitive strain gauge/accelerometer whose output is the mix of the mechanical and electrical stimulus. The basic embodiment comprises a point contact relay housed in a two section case or container. The two sections of the container are joined by a lower modulus section. A movable contact arm is spring biased against a second movable contact and the base of the contact arm floats in a viscous fluid. In the second embodiment the case or container is formed as one section and a piezoelectric crystal is mechanically coupled to the second contact.

Abstract: A piezo-electric transducer for low frequency acoustical waves comprising a stack of piezo-electric elements and alternating electrodes disposed between a front receiver plate and a counter mass. The countermass comprises a rigid annular block surrounding the stack, a rear plate engaging the rear of the stack and an elastic connection between the block and the rear plate.

Abstract: A thick layer of epoxy resin is used to bond together the piezoelectric member and a stainless steel cap to form an acoustic transducer having a broad frequency response, and specific assembling steps are taken to manufacture the transducer with good reproducibility of the characteristics.

Abstract: An acoustic surface wave filter for use as an intermediate frequency filter in a P.A.L. color television receiver comprising input and output transducers each having fingers of conductive material supported on a piezoelectric substrate the fingers of each transducer being electrically connected to a pair of terminal pads so that the fingers connected to one pad interleave with the fingers connected to the other pad, the transducers being mutually offset in a direction orthogonal to the direction of acoustic surface wave propagation and coupled by means of a multistrip coupler.

Abstract: The subject transducer consists basically of a flexible element, such as a wire, formed and supported to vibrate at a frequency depending, in part, upon the tension of the element. Means are provided to vary the tension of the element in accordance with a condition which it is proposed to monitor and a fluidic circuit is associated with the element to create a signal in accordance with the vibration of the element, the signal in turn being applied to an electric means to convert the signal into one which can actuate an electrical meter or the like. The device may be modified to include means for initially adjusting the tension of the element to set the system on zero indication and other means for adjusting the tension automatically to compensate for temperature variations.

Abstract: An improved monolithic piezoelectric filter unit having two bilateral electrodes on one surface and a common electrode on the opposite surface, the common electrode connected to the common terminal of the filter unit via a capacitor.

Abstract: A digital step motor having a wobble plate which rotates about a shaft, to produce mating contact between two sets of associated gear teeth, under the influence of a stepping electromagnetic drive. The wobble plate is coupled to the shaft about which it rotates by a universal joint free to move axially but restrained radially of the shaft.