Abstract: An acoustic transducer system includes a plurality of individual transflexural piezoelectric elements potted in a plastic or rubber compound. The panel is able to radiate broad-band, high intensity sound waves in a controllable radiation pattern.

Abstract: An energy coupling for piezo-electric crystals and mounting for the crystals wherein the crystal is flexibly edge mounted and isolated from a rigid holder and is backed by a flexible and compressible conductor to which selected frequency energy is transmitted having an adjustable compression plate therebehind for maintaining proper energy transmitting contact between the crystal and conductor for production of a collimated sound beam from the face of the crystal from a plurality of electrodes on the back face of the crystal. The system provides for energy transmission with no possibility of isolation at any frequency other than at the desired frequency of transmission.

Abstract: A piezoelectric transducer comprising first and second members in axial alignment and spaced apart, the first and second members being mutually displaceable toward and away from each other, and a transducer assembly disposed between the first and second members. The assembly includes a stationary means (first member), a piezoelectric element facing the stationary means on its entire surface, and a force converting means (second member) for generating a transverse force in direction radially outward from a center axis, facing the piezoelectric element at entire surface. The stationary means, the piezoelectric element and the force converting means are contained sequentially between the first and the second member.

Abstract: An encapsulated piezoelectric solid state motor stack having a plurality of piezoelectric disks interleaved with a plurality of electrodes. A first elastomer is used for encapsulating the stack to prevent arc-over. A second elastomer is used for encasing the combination of the encapsulating elastomer and the stack. An elastomer grease is sandwiched between the encapsulating elastomer and the encasing elastomer for reducing friction between the combination and the encasing elastomer. The friction is induced by an axial displacement produced between first and second end surfaces of the stack when the electrodes are biased by a source of electrical potential. The structure also includes a protective housing including and a diaphragm. The housing cylindrically encases the combination of the stack, the encapsulating elastomer, the elastomer grease and the encasing elastomer, and the and one end thereof. The diaphragm is attached to the housing for encasing the other end of the combination.

Abstract: In an ultrasonic sandwich transducer having an astigmatic sonic lobe, a small rectangular piezoceramic plate is operated on the fourth planar vibrational mode. To prevent the creation of secondary lobes that lead to spurious signals, damping elements are applied to the longitudinal ends of the ultrasonic sandwich transducer. These types of ultrasonic sandwich transducers find application, in ultrasonic proximity switches.

Abstract: A piezoelectric device operable in the thickness shear vibratory mode, and a method for manufacturing the piezoelectric device. In the piezoelectric device, a rectangular piezoelectric plate is polarized to have its polarization axis inclined to both the long and short sides thereof. This is accomplished by applying a predetermined electric field to the piezoelectric plate in the direction of the long side thereof, after applying a predetermined electirc field to it in the direction of the short side thereof. A pair of electrodes are formed on the piezoelectric plate so that the piezoelectric device is operable in the thickness shear vibration mode.

Abstract: A piezoelectric sensor for monitoring the kinetic momentum of a movable member has a piezoelectric sensor assembly composed of a flexible plate member having at least one plane surface and a piezoelectric element fitted onto the plane surface of the flexible plate. A mass weight member rigidly attached to the piezoelectric sensor assembly for movement therewith, the mass weight member being so configurated and arranged as to exert oscillation energy thereof essentially around the center axis of the piezoelectric sensor assembly. Exertion of vibration or oscillation energy of the mass weight member essentially around the center axis of the sensor assembly may cause greater deformation in the sensor assembly for higher sensor output.

Abstract: A piezoelectric kinetic momentum sensor employs a thin oscillable diaphragm member on which a thin plate form piezoelectric sensor element is mounted. The entire circumferential edge of the oscillable diaphragm member is supported by the sensor casing. To avoid fluctuation of sensitivity due to the exerting direction of kinetic energy, the diaphragm member and the piezoelectric sensor element are formed in a coaxial thin disc shaped configuration, in the preferred construction. In the further preferred construction, the sensor casing is composed of two seperable bottomed cylindrical components, each of whcih has its circumferential cylindrical wall section free edge mating with the other. The circumferential edge of the diaphragm member is sandwiched between the mating free edges of the cylindrical components to define a sealed and enclosed internal space within the sensor casing.

Abstract: An apparatus is provided for signalling the falling of bodies in water, comprising a piezo-electric cell for detecting frequency waves less than or equal to 5 Hz and comprising, in a case, a sensor formed of a membrane and a piezo-electric cell connected to a signal amplification and management circuit, in which the effects produced by disturbing frequencies not representative of bodies falling in water, are eliminated, wherein the effects produced by disturbing frequencies are eliminated by dumping or attenuating the frequencies higher the 5 Hz by placing, in the center between membrane 2 and the piezo-electric element 4, an elastomer disk 11 with a Shore hardness between 20 and 25 and forming an elastomer bridge.

Abstract: An ultrasonic linear motor including a traveling member having a columnar leg portion abutting at its one end against a traveling surface, and a piezoelectric element mounted on the traveling member for vibrating the leg portion in a direction intersecting an axis of the leg portion. A cover is provided around the traveling member for covering the traveling member and a protecting member is filled inside the cover in such a manner as to fully cover the piezoelectric element for protecting the piezoelectric element from an external environment, whereby the piezoelectric element can be protected from the external environment, and the separation of the piezoelectric element from the traveling member can be prevented.

Abstract: An electro-acoustic transducer having a circular transducer plate arranged in a transducer housing, clamped between two mounting members at its edge region, is provided with a piezoelectric layer. At least one seating region of the mounting member is of a rotationally asymmetrical shape to attenuate partial oscillations of a higher order. The electro-acoustic transducer is usable as a transducer for telephones.

Abstract: System for mounting a piezoelectric vibrator comprises an annular projected vibrator support (27) integrally formed with an insulating support (21), a piezoelectric vibrator (1) located on the annular vibrator support (27) and an elastic annular holder (22) having an essentially L-shaped section for holding down the periphery of the piezoelectric vibrator (1) fitted to the insulating support (21), a plurality of connecting electrode members (23,24) being mounted on the vibrator support (27) and each of the connecting electrode members (23,24) being pressed against the corresponding electrodes (2B,2A') of the piezoelectric vibrator (1).

Abstract: The invention contemplates an ultrasonic body treatment system wherein a body applicator is self-contained unit with its own radio-frequency oscillator/driver, factory-pretuned to its own transducer. A remote-control unit supplies control signals via optical coupling to the oscillator-driver of the body-applicator unit. Another optical coupling from the body-applicator unit to the remote-control unit enables fidelity of applicator performance to be monitored at the remote-control unit. A safety interlock at the body-applicator unit precludes transducer operation in the absence of adequate coupling to a patient's body. The remote-control unit can thus provide all supervisory and control functions for the body-applicator unit without any electrical interconnection between these units.

Abstract: A piezoelectric buzzer comprising a case having the shape of a bottomed cylinder, a piezoelectric diaphragm fixedly disposed within the case, a cover plate fitted in the open end of the case, and terminals integrally combined with the cover plate and each having one end in contact with the piezoelectric diaphragm and the other end projecting outside from the cover plate. Since the cover plate and the terminals are combined together by insert moldings, no gap is formed between the cover plate and the terminals, no sealing work for sealing gaps between the cover plate and the terminals is necessary, the manufacturing process is simplified, and the piezoelectric element is not exposed to the external atmosphere.

Abstract: A piezoelectric speaker in which a diaphragm containing a piezoelectric driver is fixed on a frame through an elastic supporting member. The diaphragm is an assembly of two resin foam plates facing each other. Each resin foam plate has a recess and a projecting member at the substantial center of the recess bottom. The piezoelectric driver is accommodated in the space made of the two recesses while being interposed and supported by the projecting members at the substantial center thereof.

Abstract: A piezoelectric buzzer comprising a case having the shape of a bottomed cylinder, a piezoelectric diaphragm fixedly disposed within the case, a cover plate fitted in the open end of the case, and terminals integrally combined with the cover plate and each having one end in contact with the piezoelectric diaphragm and the other end projecting outside from the cover plate. Since the cover plate and the terminals are combined together by insert molding, no gap is formed between the cover plate and the terminals, no sealing work for sealing gaps between the cover plate and the terminals is necessary, the manufacturing process is simplified, and the piezoelectric element is not exposed to the external atmosphere.

Abstract: A pump is comprised of a piezo-electric vibrator mounted in a casing. The piezo-electric vibrator is coated with an elastic elastomer layer, and a peripheral part of the elastomer layer is secured to the casing within the casing. Suction and discharge of fluid is performed by means of piezo-electric vibrator vibrated by applying alternative current voltages between electrodes of the piezo-electric vibrator. The vibration of the piezo-electric vibrator is performed smoothly to produce and high discharge volume and discharge pressure can be produced.

Abstract: A ceramic filter including a plurality of ceramic plates contacted by metal plates and enclosed within a housing includes a Teflon membrane having a plurality of bubbles or dimples therein. A curved spring plate is positioned between a wall of the housing and one of the metal plates. The shock absorbing membrane is positioned between the spring plate and the wall of the housing, and the bubbles thereof extend through openings in the spring plate. When the filter is subjected to a force substantially perpendicular to the ceramic plates, the bubbles in the shock absorber cause the edges of the metal plate to deflect upwards and thus support the adjacent ceramic plate so as to avoid shattering or cracking.

Abstract: A housing is constructed to define individual areas for depression to identify individual indicia such as numbers or the letters of the alphabet. A hard, electrically insulating material is attached to the housing to transmit strains produced in the housing by the depression of the individual areas on the housing. A plurality of thin sheets of an electrically insulating material are provided, each being attached to the insulating material at positions corresponding to the individual areas in the housing. A plurality of thin sheets of an electrically conductive material are also provided, each attached to an associated one of the thin sheets of insulating material. A plurality of ceramic crystals are also included, each attached to an individual one of the electrically conductive sheets. The electrically conductive sheets may be attached to the housing, which is preferably made from an electrically conductive material. This causes one surface of each ceramic crystal to be common to the adjacent area.

Abstract: A support for an elongated piezoelectric pressure sensor, which is general cylindrical in shape is mounted on a hollow support member that has a thickness and strength selected to meet desired conditions. The elongated piezoelectric pressure sensor is wound in a helical depression on the exterior of the support member, and the support member in turn is filled with a potting material having a bulk modulus of elasticity selected to provide a sufficient flexibility so that the elongated piezoelectric sensing element generates signals that have a desired sign characteristic and improved acoustic response.

Abstract: An electro-acoustic transducer has a transducer plate having a piezo-electric layer attached thereto. The electro-acoustic transucer is clamped between bearing members at an annular edge region which is free of the piezo-electric layer. The piezo-electric layer is provided with electrodes which extend into the annular free region of the transducer plate. At least one of the bearing members has electrically conductive zones which press directly or indirectly against the electrodes and which press against electrical plug elements on a housing for the transducer.

Abstract: A housing, preferably electrically conductive, defines individual areas for depression to identify individual indicia, e.g., number, alphabetical letters. A hard, electrically insulating material attached to the housing transmits strains produced by the depression of the individual areas on the housing. A plurality of thin electrically insulating sheets are attached to the hard insulating material at the individual areas in the housing. A plurality of thin electrically conductive sheets attached to the thin insulating sheets. The insulating sheets and the conductive sheets may constitute printed circuit segments. A plurality of ceramic crystals are attached to individual ones of the conductive sheets. The electrically conductive sheets are preferably coupled electrically to the housing. This causes one surface of each crystal to be common to the adjacent area.

Abstract: A pressure sensing apparatus for use in an integrated circuit testing station is disclosed. The testing station includes a probe, a support structure, and lift means for moving an integrated circuit upward toward the probe. The invention specifically consists of a pressure pad secured to the support structure directly above the probe. The pad includes a resilient body portion having a rigid tip. Embedded within the pad is a piezoelectric element having electrical contact leads attached thereto. When the testing station is used, an integrated circuit is moved upward by the lift means toward the probe. As the circuit contacts the probe, it moves the probe upward. As the probe moves upward, it pushes on the pad, causing internal pressures to be generated therein. Such pressures are transmitted to the piezoelectric element which generates electrical impulses proportional to the pressures exerted on the pad.

Abstract: A piezoelectric speaker including a plurality of piezoelectric vibrating elements, each including a piezoelectric vibrating plate and a weight connected to near the point of center of gravity thereof through a viscoelastic layer, and having the vibramotive force designed to be taken out of the outer edge thereof, which are connected at their peripheral ends to each other through connectors, one of said elements being connected at its peripheral edge directly to a cone type acoustic radiator to give thereto a vibramotive force mainly in a high-frequency portion, and the remaining elements adjacent thereto producing a vibramotive force adapted to share middle- and low-frequency portions for energization of said cone type acoustic radiator.

Abstract: A wiper control system controls an automotive wiper in accordance with rain conditions. Rain conditions are detected by means of a rain sensor which has a vibrator adapted to vibrate at an amplitude corresponding to rain conditions. The vibrator is adapted to produce a sensor signal having an amplitude corresponding to its vibration. The vibrator vibrates at a resonant frequency outside of the audible frequency range and has adequate sensitivity for detecting rain conditions.

Abstract: An improved chip type piezoelectric resonator in which an element having electrode layers formed on main surfaces of a piezoelectric substrate is held in a rubber-like elastic member filled in a through-bore axially formed in a chip-like case having predetermined external dimensions so as to be capable of effecting thickness shear vibration, with a consequent elimination of scattering or deviation in the external dimensions of the piezoelectric resonators.

Abstract: A shock isolator for a fragile crystal device (20) includes a headed vacuum molded Teflon sheath (10) having rib springs (12) molded on the surface (11) for absorbing the shock of impact with nearby components. An integral spacer (14) is provided and coupled to the shock isolator proper by a living hinge (15). A plurality of keyhole-shaped slots (18) are provided in the spacer for engagement with the crystal leads (22) when the spacer is folded under into its operative position.

Abstract: A thick film device conductor arrangement suitable for making connections between a resiliently mounted element such as a surface acoustic delay line and adjacent thick film conductors and then with the device connecting pins. The thick film conductors include a double layer structure of differing noble metals each selected for desirable properties in designated areas of the device.

Abstract: The invention relates to an ultrasonic converter with a plate type ceramic oscillator in which metal electrodes are fastened to the oscillator. At one end face of the ceramic oscillator an adaptation layer of plastic is present. The entire ultrasonic oscillator, except for the side of the adaptation layer facing the medium to be insonated, is provided with a foam covering, to reduce decay damping without a substantial loss in the transmission factor.

Abstract: Mechanical waves are generated in a medium by subjecting an electromechanical element to an alternating electric field having a frequency which induces mechanical resonance therein and is below any electrical resonance frequency thereof.

Abstract: A piezoelectric resonator device includes a piezoelectric resonator element accommodated in a casing. Inside the casing, the piezoelectric resonator device is held between two terminal plates through an anisotropic conduction pliable sheet which also extends on opposite sides of piezoelectric element to prevent the piezoelectric element from being moved sideways inside the casing.

Abstract: In a transducer including at least a piezoelectric ceramic plate which has curved surfaces, electrodes which are formed on both the main surfaces of the piezoelectric ceramic plate, a frame which holds the piezoelectric ceramic plate, and means for applying an electric signal to the electrodes; this invention is characterized in that the holding frame is made of an organic high-polymer resin. Since the piezoelectric ceramic plate has the curved surfaces and the holding frame is made of the organic high-polymer resin, the transducer is suitable as a loudspeaker for audio use having a wide frequency band.

Abstract: A device is disclosed which is useful to generate electric signals particularly in close quarters. The preferred embodiment is described in terms of a piezoelectric signal generator incorporated into the beltline trim of an automobile and an alternate configuration in a flat sheet metal application. The invention is discussed in terms of its ability to take advantage of already existing structural elements of its host body and its ability to be attached without putting holes in such structure.

Abstract: A piezoelectric assembly with a flexible circuit interconnect is provided. The flexible circuit interconnect is comprised of a first flexible insulating base film including spaced electrically conductive circuit traces, a second flexible insulating film disposed over a portion of the first base film and a segment of the traces, and means for electrically connecting the traces to an electrical circuit. Also provided is a method for manufacturing a flexible circuit interconnect for a piezoelectric element comprising laminating spaced circuit traces on a flexible insulating base material to define a contact arrangement with a first set of terminal ends of the traces; attaching termination electrical connectors at a second set of terminal ends of the traces; mounting an insulating overlay to the base material for insulating a portion of the traces and electrical connectors; and, mounting a piezoelectric element to the contact arrangement.

Abstract: In a support and connection device for a disc-shaped piezoelectric resonator, the support elements are bent at their ends relative to the resonator and comprise electrically conductive spring strips which engage into radially-directed resonator slots. Tongues attached to the bent sections form clips at the support elements which are open towards the top and provide pockets which are suitable for receiving conductive adhesive.

Abstract: A piezoelectric audio transducer adapted to produce a sound output when a vibrator which is formed by bonding a piezoelectric element to a metallic diaphragm is electrified, wherein the audio transducer is formed by securely supporting the outer periphery of the vibrator on an acoustic casing, and a fixing part to be fixed to a mounting body is provided on the audio transducer and is connected to the casing with an elastic body interposed therebetween so as to thereby enable the casing which is fixed to the mounting body to vibrate integrally with the vibrator when said vibrator is vibrated.

Abstract: An ultrasonic transducer comprises a vibrating assembly having a thickness-poled piezoelectric ceramic disk (12) bonded concentrically to a resonant plate (13) of greater diameter than that of the ceramic disk (12), which having a radiator (30) is set in the center of the resonant plate (13) on the opposite surface to the ceramic disk (12), and which fitted onto a plastic baseplate (51) using such adhesive (52) as will retain elasticity after curing and accommodated within a housing (80) with a director (81) on top.The ultrasonic transducer has superior performance to conventional bimorph devices by 6 dB in terms of receiving sensitivity.

Abstract: A piezoelectric filter comprises a piezoelectric substrate having separate first and second electrode layers formed on one surface thereof and a common electrode layer formed on the opposite surface thereof, first and second terminal members, and a common terminal member electrically connected to the common electrode layer. The first and second terminal members are electrically connected to the first and second electrode layers through different local areas of a direction-oriented electroconductive plastic sheet capable of exhibiting its electroconductivity in a predetermined direction across the thickness thereof. An ordinary electroconductive rubber sheet may be positioned between the common terminal member and the common electrode layer.

Abstract: A piezoelectric filter comprises at least one piezoelectric resonator comprising a piezoelectric substrate and first and second electroconductive terminal members deposed one on each side of the piezoelectric substrate, with which they are in electrical contact. At least one electroconductive pliable sheet is disposed between the first terminal member and the associated face of the piezoelectric substrate, and pressure is applied across the thickness of the combination of electrodes, pliable sheet and substrate.

Abstract: An ultrasonic transducer comprises a composite vibrator, which comprises a bimorph vibrator and a resin made additional resonator of a frustum of a cone provided at the central portion of the bimorph vibrator. The composite vibrator gives rise to the first resonance by a piston vibration mode at the lower frequency region and the second resonance by a bending vibration mode at the higher frequency region as compared with the central frequency. The composite vibrator is fixed to an insulating base through a ring shaped elastic member, whereby a resonance characteristic by virtue of a piston vibration mode is enhanced. Preferably a protrusion of the diameter slightly smaller than the nodal circle by virtue of a bending vibration mode is formed on the transducing surface of the resin made additional resonator of a frustum of a cone. The protrusion serves to reduce the quality factor of the second resonance by virtue of a bending vibration mode.

Abstract: A piezoelectric resonator comprises a piezoelectric substrate, a common electrode layer applied on one major surface of the piezoelectric substrate, and at least one electrode layer applied on its second major surface. The piezoelectric substrate is held in position between two or more metallic terminal elements, with the electrode layers held in electrical contact with the terminal elements. The piezoelectric resonator further comprises at least one direction-oriented electroconductive sheet positioned between the electrode layer on the second major surface of the piezoelectric substrate and the associated terminal element. The direction-oriented electroconductive plastic sheet has substantial electroconductivity only across its thickness.

Abstract: An arrangement for supporting a vibratory atomizer for liquids, in which a nozzle for ejecting the liquid forms the end of a longitudinal passage in a decreasing-diameter resonant vibration-amplifier horn that extends from a body portion equipped with a generator for longitudinal vibrations, in a supporting structure with a minimum of interference with either the longitudinal vibrations or radial vibrations which accompany these longitudinal vibrations. The atomizer is clamped axially between two annular resilient support members one of which acts upon a flange-like shoulder surface of the atomizer perpendicular to the longitudinal vibration at the larger-diameter base of the amplifier horn and permits relatively unrestricted radial movement of the shoulder surface, while the other engages the horn surface in the vicinity of this plane along a line at which the horn surface intersects a nodal zone of zero radial vibration, where it acts to centralize the atomizer in addition to supporting it axially.

Abstract: A pulsed liquid droplet ejecting apparatus wherein a rectangular piezoelectric transducer is arranged abaxially over an ink containing channel with an edge in operating relationship with the channel. The edge of the transducer is held fixed so that on excitation of the transducer by an electrical pulse, the transducer extends towards the channel ejecting a drop. The piezoelectric transducer is coated with a material, which provides shear relief between the piezoelectric transducer and the ejector embedding material.

Abstract: An intrusion sensor uses thin film piezoelectric transducers to sense nea mechanical vibrations. A hose-like sheath contains a pair of insulating strips which carry conductive leaves on their outer surfaces. A series of longitudinally arranged segments of a thin film piezoelectric material are coupled to the leaves to provide signals representative of impinging mechanical vibrations. Since adjacent ones of the thin film segments are alternately polarized, signals are created only when the vibrations are nearby. Greater sensitivity to nearby vibrations is assured when each of the segments is fabricated from several layers of the thin film piezoelectric material.

Abstract: A supporting structure for a quartz oscillator having terminal pins extending from one end portion of the oscillator in an electronic timepiece having a circuit substrate supporting the one end portion of the oscillator by means of the terminal pins connected thereto, which supporting structure comprises a flat portion held between the quartz oscillator, connected to the circuit substrate, and the circuit substrate, a vertical projection extending from the flat portion and engaging the outer periphery of the quartz oscillator, and at least one hook portion extending from the flat portion and engaging the flange of the quartz oscillator at another end thereof.

Abstract: The elastic surface wave device comprises a piezoelectric substrate having a dielectric constant of .epsilon..sub.2, a dielectric film having a dielectric constant of .epsilon..sub.1 and a thickness of h, and deposited on the piezoelectric substrate, and an inter-digital type input-ouput transducer formed on the dielectric film. The ratio of the dielectric constants .epsilon..sub.1 /.epsilon..sub.2, and a function 2.pi./.lambda..multidot.h proportioned to the thickness of the dielectric film are selected to satisfy a condition established in a frustum shaped region bounded by coordinate points P (.epsilon..sub.1 /.epsilon..sub.2 = 1/5,(2.pi./.lambda.).multidot.h = 0.1), Q(.epsilon..sub.1 /.epsilon..sub.2 = 1/5,(2.pi./.lambda.).multidot.h = 0.00016), R(.epsilon..sub.1 /.epsilon..sub.2 = 1/500,(2.pi./.lambda.).multidot.h = 0.0004), and S(.epsilon..sub.1 /.epsilon..sub.2 = 1/500, (2.pi./.lambda.).multidot.h = 0.006) on a graph wherein the ratio .epsilon..sub.1 /.epsilon..sub.

Abstract: An elastic surface wave filter having a substrate of ceramic material and input and output transducer electrodes of interleaved-comb-type rigidly mounted on one surface of the substrate. A top covering is mounted on the electrode-mounted surface of the substrate. This substrate concurrently serves as a medium through which, when the filter is energized, an elastic surface wave is propagated from the input transducer electrode towards the output transducer electrode and also as a closure for closing the opening of the top covering.