Abstract: Disclosed are multi-poled piezoelectric devices with improved packing density and methods for making such multi-poled piezoelectric devices with improved packing density. The multi-poled piezoelectric devices comprise: a) a top electrode, a piezoelectric layer, and a bottom electrode fabricated on a substrate; b) vias generated by etching the piezoelectric layer, the top electrode, or both; and c) a re-distribution layer (RDL) deposited over one or more of: the top electrode, the piezoelectric layer, the bottom electrode, or the one or more vias.

Abstract: A half bridge converter is controlled by a circuit including a differential circuit receiving a reference signal and a feedback signal which is a function of an output signal from the converter. The half bridge includes hand and low side switches. A comparator generates a PWM signal for controlling the converter as a function of the duty cycle of the PWM signal in response to a signal at an intermediate node between the hand and low side switches and an output of the differential circuit. A gain circuit block coupled between the intermediate node and the input of the comparator applies a ramp signal to the input of the comparator which is a function of the signal at the intermediate node. A variable gain is applied by the gain circuit block in order to keep a constant value for the duty cycle of said PWM signal irrespective of converter operation.

Abstract: A film bulk acoustic resonator (FBAR) chip and package structure with improved power tolerance includes: a first substrate having a plurality of FBARs each having a bottom electrode, a piezoelectric material, and a top electrode, and first bonding pads connected to the bottom electrodes or the top electrodes of the FBARs; and a second substrate having a plurality of vias passing therethrough, second bonding pads located on one end surface of the vias facing the first substrate, and external connection pads located on the other end surface of the vias which does not face the first substrate, wherein the first substrate and the second substrate are bonded by means of bonding of the first bonding pads and the second bonding pads.

Abstract: A piezoelectric composition according to the present invention comprising: a carbon, and a main component composed of an alkali metal niobate based compound. The amount of carbon contained is 350 to 700 ppm by weight.

Abstract: In some embodiments, a dielectric elastomer device may include at least first and second dielectric elastomer layers, and a first layer of conductive particles disposed between the first and second dielectric elastomer layers and forming a first electrode of the device, wherein portions of the second dielectric elastomer layer are directly bonded with portions of the first dielectric elastomer layer through the first layer of the conductive particles. The dielectric elastomer layer may, for example, comprise a cured acrylic elastomer precursor with an additive including urethane, polybutadiene, or silicone. Electrodes in different layers may be interconnected by infusing a liquid or semi-liquid conductive material in contact with each of a plurality of the electrodes of the actuator or sensor device, and solidifying the conductive material to form a conductive path that interconnects the plurality of electrodes.

Abstract: Disclosed is a digital chip-based digital driving method for a piezoelectric ceramic transformer, comprising the following steps: in a case where there is a variation in temperature and/or humidity, acquiring an output voltage of the piezoelectric ceramic transformer after rectification via a high voltage sampling circuit; sending the acquired output voltage signal to a single chip microprocessor DDS generator, comparing the acquired output voltage with a preset voltage by the single chip microprocessor DDS generator, and adjusting the frequency of the driving signal in a case where a difference between the acquired output voltage and the preset voltage exists; and adjusting a boost ratio of the piezoelectric ceramic transformer by the frequency of the driving signal, so as to output the preset voltage by the piezoelectric ceramic transformer.

Abstract: A piezoelectric device includes a substrate having opening portions, a vibrating plate provided to overlap with the substrate and having a plurality of vibrating regions overlapping with the opening portions in a plan view as seen from a thickness direction of the substrate, piezoelectric elements provided in the vibrating regions, and bypass wires provided outside of the vibrating regions of the vibrating plate and electrically coupled to the plurality of piezoelectric elements, wherein slits penetrating the bypass wires in the thickness direction are provided in the bypass wires.

Abstract: A vibrator element includes at least one vibrating arm with a weight provided thereto. The weight is provided with at least one processing scar. When an axis which overlaps a center in a width direction of the vibrating arm, and which extends along an extending direction of the vibrating arm is a central axis, and an axis which overlaps a centroid of the vibrating arm, and which extends along the extending direction of the vibrating arm is a centroid axis, the processing scar is formed in at least an area at the centroid axis side with respect to the central axis. S1>S2, where an area of the processing scar located at the centroid axis side with respect to the central axis is S1, and an area of the processing scar located at an opposite side to the centroid axis with respect to the central axis is S2.

Abstract: A dielectric elastomer transducer includes a dielectric elastomer layer, a pair of electrode layers sandwiching the dielectric elastomer layer, and a support that supports the dielectric elastomer layer. The dielectric elastomer layer includes a movable region separated from the support and a fixed region supported by the support. A pair of conduction paths are established that are configured to conduct electricity to the electrode layers via power cables and power supply points at which core wires of the power cables are electrically connected, respectively. The power supply points are separated from the movable region of the dielectric elastomer layer.

Abstract: An ultrasonic device includes a substrate having a plurality of opening parts and a wall, a vibrating plate closing the opening parts, and vibrators provided to the vibrating plate, wherein the plurality of opening parts includes a first opening part, a second opening part adjacent to the first opening part via a first wall, and a third opening part adjacent to the first opening part via a second wall, a first vibrating section closing the first opening part and the vibrator constitute a first ultrasonic transmitter, a second vibrating section closing the second opening part and the vibrator constitute an ultrasonic receiver, a third vibrating section closing the third opening part and the vibrator constitute a second ultrasonic transmitter, and the wall width of the first wall is larger than the wall width of the second wall.

Abstract: An ultrasonic vibration device has a sonotrode and a converter, the converter having a piezoelectric actuator for converting an electrical alternating voltage into a mechanical vibration. A first piezoelectric sensor element outputs a first measurement signal which varies in dependence on the vibration amplitude of the mechanical vibration. To permit measurement of at least one intensive state variable like the temperature, or the aging state of the piezoelectric actuator, a second piezoelectric sensor element outputs a second measurement signal which also varies in dependence on the vibration amplitude of the mechanical vibration. However, the second piezoelectric sensor element differs in a physical property from the first.

Abstract: A transducer of the preferred embodiment including a transducer and a plurality of adjacent, tapered cantilevered beams. Each of the beams define a beam base, a beam tip, and a beam body disposed between the beam base and the beam tip. The beams are arranged such that each of the beam tips extends toward a common area. Each beam is joined to the substrate along the beam base and is free from the substrate along the beam body. A preferred method of manufacturing a transducer can include: depositing alternating layers of piezoelectric and electrode onto the substrate in block, processing the deposited layers to define cantilever geometry in block, depositing metal traces in block, and releasing the cantilevered beams from the substrate in block.

Abstract: A layer system especially for forming SAW devices thereon is proposed comprising a monocrystalline sapphire substrate having a first surface and a crystalline piezoelectric layer comprising MN, deposited onto the first surface, and having a second surface. As a first surface a crystallographic R-plane of sapphire is used enabling an orientation of c-axis of the piezoelectric layer parallel to the first and second surfaces.

Abstract: A piezoelectric ceramic containing no lead as a constituent element is provided. Coefficient of variation C.V. of grain size of grains contained in the piezoelectric ceramic is 35% or less, and an image quality (IQ) image obtained by analyzing a cross section of the piezoelectric ceramic by an electron backscatter diffraction (EBSD) method shows that at least one of the grains has a grain size of 3 ?m to 5 ?m and an area ratio of a domain in said at least one of the grains is 85% or more.

Abstract: A miniature fluid actuator is disclosed and includes a substrate, a chamber layer, a carrying layer and a piezoelectric assembly. The substrate has an inlet. The chamber layer is formed on the substrate and includes a first chamber in communication with the inlet, a resonance layer and a second chamber. The resonance layer has a central aperture in communication between the first chamber and the second chamber. The carrying layer includes a fixed region formed on the chamber layer, a vibration region, a connection portion and a vacant. The vibration region is located at a center of the fixed region and corresponding to the second chamber. The connection portion is connected between the fixed region and the vibration region. The vacant is formed among the fixed region, the vibration region and the connection portion. The piezoelectric assembly is formed on the vibration region.

Abstract: A multilayer actuator includes a primary electrode, a secondary electrode overlapping at least a portion of the primary electrode, and an electroactive layer disposed between and abutting the primary electrode and the secondary electrode. The multilayer actuator further includes a primary antireflective coating overlapping at least a portion of the primary electrode opposite the electroactive layer, a secondary antireflective coating overlapping at least a portion of the secondary electrode opposite the electroactive layer, and a barrier layer overlapping the secondary antireflective coating opposite the secondary electrode.

Abstract: Methods, systems, and devices are disclosed for fabricating 3D piezoelectric materials. In one aspect, a method includes photopolymerizing a selected portion of a two dimensional plane in a sample of a photolabile polymer solution containing piezoelectric nanoparticles to form a layer of a piezoelectric material, the photopolymerizing including directing light from a light source based on a pattern design in the selected portion of the photolabile polymer solution; and moving one or both of the sample and the directed light to photopolymerize another selected portion of another two dimensional plane in the sample to form another layer of the piezoelectric material.

Abstract: The present disclosure relates to circuitry for driving a piezoelectric transducer. The circuitry may be implemented as an integrated circuit and comprises driver circuitry configured to supply a drive signal to the piezoelectric transducer to cause the transducer to generate an output signal and active inductor circuitry configured to be coupled with the piezoelectric transducer. The active inductor circuitry may be tuneable to adjust a frequency characteristic of the output signal.

Abstract: An ultrasonic Lamb wave transducer for non-invasive measurement and for emitting and/or receiving an ultrasonic Lamb wave pulse, an emission and a reception of the ultrasonic Lamb wave having an emission direction and a reception direction, respectively, the ultrasonic Lamb wave pulse being defined by at least one parameter, includes: at least one piezocomposite actuator for controlling the emission direction of the ultrasonic Lamb wave by emitting acoustic radiation at frequencies that are appropriate for generating ultrasonic Lamb waves.

Abstract: A sound producing device in which an adhesive layer between a piezoelectric element and a metal plate has sufficient electrical conductivity includes: a metal plate; a piezoelectric ceramic including a first adhesion surface, the first adhesion surface being a surface bonded to the metal plate; an alternating current power supply that applies an alternating voltage to the piezoelectric ceramic; and an adhesive layer formed from conductive adhesive and thermosetting adhesive which are spread over the first adhesion surface, the conductive adhesive being applied in a center portion of the first adhesion surface and the thermosetting adhesive being applied at three or more locations in a periphery of the first adhesion surface. An adhesion surface of the metal plate that is bonded to the piezoelectric ceramic is a second adhesion surface, and the first adhesion surface and the second adhesion surface are bonded together by the adhesive layer.