Abstract: A compact electronic selection card applicable for use in Jacquard equipment, having a high-density array of selecting hooks which are individually positioned by piezoelectric actuator elements. Each piezoelectric element directly controls a selecting hook for engaging a corresponding hooked rod connected to a warp yarn. The engaged rods are then lifted to form the shed. Because each element directly positions the hook rather than indirectly controlling a positioning mechanism, the selection card is mechanically simple and compact.

Abstract: The present invention provides a composite piezoelectric transducer having a piezoelectric ceramic, an organic polymer, and an electrode group formed only on surfaces of the piezoelectric ceramic. The groove is formed, having a depth 50% to 90% of the thickness of the piezoelectric ceramic. A ratio, between a width of a non-diced area formed by forming the groove on the piezoelectric ceramic and the depth of the groove is 0.2 to 0.7. An organic polymer is filled in the groove formed in the piezoelectric ceramic in a state including bubbles. The electrode group comprises a first electrode and a second electrode, the first electrode being formed on a first surface of the piezoelectric ceramic, and the second electrode being formed on a second surface of the piezoelectric ceramic, a side surface thereof, or on the second surface, the side surface and the first surface, the second surface being opposite to the first surface in the direction of the thickness of the piezoelectric ceramic.

Abstract: An ultrasonic linear motor according to the present invention has a configuration wherein driving elements are glued at portions on faces of an ultrasonic transducer, facing one another, where rotational directions of elliptic vibrations generated on the faces are reverse one to another, a pair of guides are provided for being pressed into against the driving elements so as to hold the ultrasonic transducer therebetween, and leaf springs serving as pressing part are provided so as to narrow a spacing between the one pair of guides, whereby the ultrasonic transducer is configured as an self-moving ultrasonic linear motor which can drive by itself. Thus, driving properties of the ultrasonic transducer itself is improved, and also the size of the ultrasonic linear motor can be reduced.

Abstract: An Interdigital Bulk Acoustic-Wave Transducer (IBAT) device is provided with pairs of exciting electrode fingers disposed sufficiently close together on the piezoelectric substrate and dielectric coating over the exciting electrode fingers to generate an IC-compatible voltage at relatively high electric field strength, resulting in a reduced region of excitation and uniform electric field strength distribution. The IBAT advantageously produces a lateral electric field substantially uniform over a substantial portion of the active BAW structure area, reducing, or virtually eliminating sharp voltage spikes, an electrical field produced by the low voltages resident on integrated circuit (IC) chips, usually of a magnitude of 10 volts, or lower, the planar electrode structure being compatible with IC processing techniques, such as photolithography and the BAWs produced thereby being essentially plane waves, with propagation away from, but with phase progression substantially parallel to, the substrate surface.

Abstract: An electrostatic bimorph actuator includes a cantilevered flexible bimorph arm that is secured and insulated at one end to a planar substrate. In an electrostatically activated state the bimorph arm is generally parallel to the planar substrate. In a relaxed state, residual stress in the bimorph arm causes its free end to extend out-of-plane from the planar substrate. The actuator includes a substrate electrode that is secured to and insulated from the substrate and positioned under and in alignment with the bimorph arm. An electrical potential difference applied between the bimorph arm and the substrate electrode imparts electrostatic attraction between the bimorph arm and the substrate electrode to activate the actuator. As an exemplary application in which such actuators could be used, a microelectrical mechanical optical display system is described.

Abstract: A positive charge of a sensor element is charged in a signal converting circuit, is converted into a positive voltage, and is outputted. When the polarity of the charge of the sensor element is inverted to the negative and an output of the signal converting circuit is decreased, the leaked charges are superimposed and become the negative. An automatic correction circuit detects the negative output and discharges the charges so as to set the input to “0”. Thus, the offset of the signal level due to the charge leakage is automatically corrected.

Abstract: Electromechanical translation apparatus provides power-off clamping because each clamp assembly comprises pressure means and clamp actuator means acting in opposition. The pressure means is arranged, when the actuator is de-energized, to apply clamping force to releasably clamp the associated movable member to the clamp assembly. The clamp actuator means is arranged, when energized, to act against the pressure means to release the movable member.

Abstract: For improved conformance of a filter operating with acoustic waves, a transducer structure is provided in which the separations between respectively two adjacent electrode fingers of an inter-digital transducer (IDTv) vary over the length of the transducer. The variation thereby preferably follows a continuous distribution function. Reactance filters that are provided with such filters in the serial branch show an improved electrical conformance in the transmission range.

Abstract: A multilayer piezoelectric element has at least one first piezoelectric layer and at least one second piezoelectric layer. First internal electrodes are separately arranged on each first layer, and second internal electrodes are arranged on each second layer. The first and second layers are laminated alternately so that the first and second internal electrodes overlap in one-to-one correspondence.

Abstract: A lead zirconate titanate-based thin film is an epitaxial crystal thin film and has a chemical composition represented by the general formula Pb1-xLnxZryTi1-yO3 (wherein Ln represents any one selected from the group consisting of lanthanum, lanthanoid elements, niobium, calcium, barium, strontium, iron, manganese and tin; and 0?x<1, 0.43?y?0.65) and whose orientation is {111} (including orientations whose tilt angle from the direction perpendicular to the substrate surface is within 15°).

Abstract: A device comprising a resonator formed of a piezoelectric layer sandwiched between two metal electrodes, the resonator being laid on a suspended beam, the device comprising means for deforming said beam by the difference in thermal expansion coefficients.

Abstract: A surface acoustic wave device includes a sealing resin for sealing a gap between a surface acoustic wave element and a mounting board. The sealing resin is prevented from flowing so as to reach a vibrating portion of the surface acoustic wave element. In the surface acoustic wave device, a surface acoustic wave element is connected to a mounting board through bumps, the outer peripheral edge of the surface acoustic wave element is sealed by a sealing resin, and a vibration space is secured between the vibrating portion of the surface acoustic wave element and mounting board. In the surface acoustic wave element, an outer barrier enclosing the bumps and the vibrating portion and an inner barrier enclosing the vibrating portion are provided, the height of the outer barrier is lower than the total height of the height of the bumps and the height of electrode lands formed on the mounting board, and the height of the inner barrier is lower than the height of the bumps.

Abstract: In a surface acoustic wave device, a common portion and a strip portion of a reflector electrode are partially cut off to increase a space between the electrodes. The increase of the space between the electrodes reduces the influence of the amount of charges and the influence of an unbalance between the amounts of charges in etching of a metallic film, thereby preventing the electrodes from having a curved shape in section. Consequently, the surface acoustic wave device has a reduced propagation loss.

Abstract: The present invention proves a piezoelectric composite comprising, as main components, a piezoelectric ceramic and a polymer having a bulk density of 0.4 g/cm3 or less, the polymer including bubbles dispersed therein. Therefore, the piezoelectric composite of the present invention has a reduced bulk density, a high coefficient of electromechanical coupling in spite of the piezoelectric ceramic having a low volume ratio, a reduced acoustic impedance and a good processing character.

Abstract: The invention relates to a device for displacing a moving part along a longitudinal axis relative to a housing, said device being symmetrical about a plane extending longitudinally relative to the moving part, the device comprising two structures that are secured to said moving part and elements of active material comprising at least two blocks extending between inside walls of each structure, with the elongation directions of the blocks being antisymmetrical about an axis substantially perpendicular to the displacement axis of the moving part, wherein the structures are flexible and suitable for displacing the moving part by deforming as a function of the elongation of the blocks.

Abstract: A flexural actuator is fitted with an actuator means, the flexural actuator being fitted at its functional section with a sensor means for determination of the longitudinal stretch. This sensor means is placed at a position, and/or is placed in the longitudinal direction symmetrically on either side of such position, at which there is a constant longitudinal stretch independent from the setting force when the functional section is thrusting against a resistance.

Abstract: In a SAW device containing two or more longitudinal mode coupling type SAW elements connected in parallel, each SAW element includes at least three comb shaped electrode pairs and a reflector electrode provided at both sides of the comb shaped electrodes. One part of respective comb shaped electrode pairs forming IDT electrodes is connected together in common by a ground connection electrode and connected with a ground pad. This configuration enables the number of connection pads to be minimized, thus providing a SAW device that is small in size and superior in filter characteristics.

Abstract: A transducer assembly for receiving a stimulating signal and producing ultrasound therefrom at one or more frequencies, over an ultrabroad bandwidth at each frequency, includes a front mass disposed about a central axis, and a back mass disposed about the central axis, laterally offset from the front mass. The transducer assembly also includes one or more resonators disposed about the central axis and between the front mass and the back mass, including at least one electrical contact for receiving the stimulating signal. The back mass consists of a low-density material, such as aluminum, aluminum alloy, magnesium, or magnesium alloy, or any of various low-density materials known in the art. In general, the back mass is characterized by a density of less than 6.0 g/cc. In one embodiment, the front mass and the back mass are made from different materials, and the front mass includes a deviation from symmetrical symmetry.

Abstract: An ultrasonic cleaning tank for use in cleaning electronic parts having a top portion and a bottom portion operably divided by a perforated dispersion plate. The cleaning tank is assembled to avoid internal projections or obstructions within the top portion to create a piston-like, laminar flow region. The dispersion plate is constructed to provide a backpressure within the bottom portion so as to promote even flow of a cleaning fluid through the perforations. The cleaning fluid flows upward past an electronic part. At the same time, an ultrasonic transducer supplies ultrasonic energy within the cleaning fluid creating cavitation such that any particulate matter is scrubbed from the electronic parts. The particulates are subsequently carried upward by the laminar flow and over a tank lip. The cleaning tank can be used in either a batch or recirculating mode.

Abstract: A piezoelectric vibration piece is provided including a pair of vibration arms that are formed of a piezoelectric material, and extend in a horizontal direction from a base section. Grooves with a bottom are provided in the vibration arms, and extend along the length direction of the corresponding vibration arm. Support sections are provided in such a manner to cross the groove in a width direction to integrally connect the material structuring the vibration arm separated by the groove in the width direction.