Abstract: A laminated terminal layer is at least a double layer comprising a first layer made of a hard material and a second layer made of a soft material. The first layer is flexible. The second layer is overlapped on the first layer and in contact with an electrode of a piezoelectric ceramic resonator. Preferably, the hard material is phosphor bronze and the soft material is Al, Ag, or Pb as a simple substance or, any alloy thereof.

Abstract: In a piezo-resonator in which the resonator cavity is coated with a resinous insulator, a lip which defines a ridge for the mounting of the terminal strips to the resonator is fused to the outer surface of the strips. The seal produced thereby prevents resin from invading the resonator cavity during the resin coating process.

Abstract: A light-emitting diode is energized by converting a mechanical energy by means of a piezoelectric element into electrical charges which are transformed in a transformer into current pulses sufficient for activating the light-emitting diode. The component parts of a device of this invention include a rotation-symmetrical housing enclosing a striking member which is spring-biased against an opening in the housing, a piezoelectric element cooperating with the striking member and having two opposite electrodes connected to a primary winding of a pulse transformer. The secondary winding of the transformer is connected to the leads of the light-emitting diode. The piezoelectric element is pressed against the compression spring of the striking member by a connection spring leading to a terminal of the primary winding. All component parts are aligned along the center axis of the housing.

Abstract: A shock absorbing insert for protecting a fragile quartz crystal includes a Teflon carrier with sloping walls which carries a number of dimple or rib shaped springs. These springs have varying spring rates increasing as they get farther from the base. The carrier is supported by a cushion spring system having a lower spring rate than that of the dimple or rib springs. This structure allows the force of mechanical shock to be distributed across the entire surface of the crystal rather than being concentrated at isolated areas of high stress.

Abstract: A holder for a piezoelectric crystal wafer comprising a base, a pair of spaced apart leaf springs secured to the base and a seat member secured to the base between the leaf springs. The leaf springs spread outward upon the application of an external force, to permit the placement of a crystal wafer on the seat member and return toward a normal position upon the release of the external force, to resiliently hold the crystal wafer on the seat member.Each leaf spring includes a pair of prongs at the upper end thereof, separated by a slit having a width slightly larger than the thickness of the wafer. An elongated slot is formed in each of the leaf springs and having a width greater than the width of the slit between the prongs. When the crystal wafer is inserted in the holder, the upper part of the wafer is received in the slit of one leaf spring and a side portion of the wafer extends through the slot of the leaf spring.

Abstract: A low voltage, high frequency actuator for correcting distortions in laser optics systems.

Abstract: A piezoelectric rotary actuator including: a rotatable member; a spiral member fixed at its inner end to the rotatable member; one or more piezoelectric layers attached on one or both sides of the spiral member; means for rotatably supporting the rotatable member relative to the outer portion of the spiral member; and an electrode for applying a voltage across the piezoelectric layer or layers, to bend the spiral and rotate the rotatable member.

Abstract: A piezoelectric resonating element includes a piezoelectric plate (2) having an elongated rectangular shape with first and second major flat surfaces. The piezoelectric plate (2) is formed with an elongated groove (3) on the first major flat surface extending in an lengthwise direction of the piezoelectric plate (2) to separate the first major flat surface into first and second lands. A first electrode (6) is deposited on the first land, and a second electrode (7) is deposited on the second land. A third electrode (12) is deposited entirely on the second major flat surface. A dicing saw is used to form the groove and cut out the element from a mother piece.

Abstract: An electrically actuated positioning element system utilizes a positioning element formed of piezo-electrical bodies each formed of a plurality of lamellae having electrodes. The lamellae have a length substantially greater than their thickness and upon application of an electrical voltage with a field direction which promotes a polarization of the material of the lamellae, the body is shortened. The two bodies are connected to one another at one end by a cross arm and at the other end the one body end is active and free to move relative to the other body end such that a resultant relative motion occurring between the two body ends may be utilized. Preferably a connection is provided for absorbing a lateral thrust of the bodies. The two piezo-electrical bodies are each electrically connected to one another for reverse-phase operation such that one contracts while the other is in a lengthened condition and vice versa.

Abstract: A resonator assembly having a base and a cap provided with cooperating notch and projecting terminal retainer structure serving to retain the terminals of the spring contacts in centered disposition within the assembly and further serving to retain the cap to the base in assembled disposition. The notches are caused to have a width slightly greater than that of the terminals to permit facilitated inward movement of the terminals into the notches in the assembly procedure. The base is further provided with at least one securing recess and the cap is provided with a corresponding number of securing projections fitted one each into each securing recess for further securing the cap to the base. The sidewall of the base may be enlarged to accommodate the securing recesses therein.

Abstract: An actuating device for loading a piezoelectric element including a loading element and a control element each fixed, respectively, upon one of a pair of relatively rotatable parts which may form part of a clutch. Cam projections on the control element intermittently lift the loading element away from the piezoelectric element whenever relative rotation of the two rotatable parts occurs in either direction. Sudden release of the loading element after being raised by the cam projections provides loading on the piezoelectric element to produce an electrical discharge thereby, for example, to indicate the occurrence of clutch slippage.

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: In an electric filter device such as a band pass filter, a resonator having hollow tubes soldered to both outside faces is suspended in a casing by springs which engage the ends of the tubes. In multiple resonator assemblies the end resonators have hollow tubes projecting from the outside faces for attachment to the springs, and the inside faces are joined by telescoping force fit hollow tubes. In one embodiment, the resonators are of different shapes.

Abstract: For use in transmitting acoustic waves propated along a well drilling string, a piezoelectric transducer is provided operating in the relatively low loss acoustic propagation range of the well drilling string. The efficiently coupled transmitting transducer incorporates a mass-spring-piezoelectric transmitter combination permitting a resonant operation in the desired low frequency range.

Abstract: The acoustic data communication system includes an acoustic transmitter and receiver wherein low frequency acoustic waves, propagating in relatively loss free manner in well drilling string piping, are efficiently coupled to the drill string and propagate at levels competitive with the levels of noise generated by drilling machinery also present in the drill string. The transmitting transducer incorporates a mass-spring piezoelectric transmitter and amplifier combination that permits self-oscillating resonant operation in the desired low frequency range.