Abstract: A piezoelectric sensor assembly, a manufacturing method thereof, a display panel and an electronic device including the same are provided. The piezoelectric sensor assembly includes: a base substrate; a plurality of ultrasonic transducers, wherein a spacing area is provided between two adjacent ultrasonic transducers; and an acoustic matching layer, wherein the acoustic matching layer includes a plurality of acoustic matching areas, and an orthographic projection of at least one acoustic matching area on the base substrate falls into an orthographic projection of the ultrasonic transducer corresponding to the acoustic matching area on the base substrate, wherein an isolation cavity is provided between two adjacent acoustic matching areas.

Abstract: A power supply circuit that outputs an electric power that is input from a vibration-driven energy harvesting element to an external load, includes: a negative half-wave rectifying circuit that half-wave rectifies an alternating current power that is input from the vibration-driven energy harvesting element, into a negative voltage output; an inverting chopper circuit that inverts and outputs the negative voltage output which is output from the negative half-wave rectifying circuit, into a positive voltage output.

Abstract: Proposed is a self-resonance tuning piezoelectric energy harvester with broadband frequency, including: a piezoelectric beam which is extended along a horizontal direction; a fixing member which fixes opposite ends of the piezoelectric beam; and a mobile mass which the piezoelectric beam passes through, and which is capable of self-movement along the piezoelectric beam through a through-hole which has a free space in addition to a space which the piezoelectric beam passes through, wherein as the mobile mass moves to a position of the piezoelectric beam, generated displacement of a piezoelectric beam is increased, and as the generated displacement becomes greater than the free space, the mobile mass is fixed to a position of a piezoelectric beam at which resonance will occur.

Abstract: A piezoelectric transducer includes beam portions each with a fixed end portion and extending in a direction away from the fixed end portion. A base portion is connected to the fixed end portion of each of the beam portions. The beam portions extends in a same plane, and respective extending directions of at least two beam portions are different from each other. The beam portions each include a single crystal piezoelectric layer having a polarization axis in a same direction, an upper electrode layer, and a lower electrode layer. A polarization axis has a polarization component in the plane. An axial direction of an orthogonal axis that is orthogonal to the polarization axis and extends in the above-described plane intersects with an extending direction of each of the plurality of beam portions.

Abstract: A through hole formed in an AT-cut crystal plate includes an inclined surface (72) that extends from a peripheral area toward a penetrating part (71) in a center part of the through hole. The inclined surface (72) includes: a first crystal surface S1 that extends from the penetrating part (71) toward the peripheral area of the through hole in a ?Z? and a +X directions; a second crystal surface S2 that extends from the penetrating part (71) toward the peripheral area of the through hole in the ?Z? and the +X directions and that contacts with the first crystal surface S1 in the +Z? and the +X directions of the first crystal surface S1; and a third crystal surface S3 that contacts with the second crystal surface S2 in the +X direction of the second crystal surface S2 and that contacts with the main surface of the AT-cut crystal plate.

Abstract: A piezoelectric device includes a container and an AT-cut crystal element. The AT-cut crystal element has at least one side surface intersecting with a Z?-axis of the crystallographic axis of the crystal constituted of three surfaces. The first surface is a surface equivalent to a surface formed by rotating the principal surface by 4°±3.5° with an X-axis of the crystal as a rotation axis. The second surface is a surface equivalent to a surface formed by rotating the principal surface by ?57°±5° with the X-axis. The third surface is a surface equivalent to a surface formed by rotating the principal surface by ?42°±5° with the X-axis. When two corner portions on a side of a second side opposed to the first side of the AT-cut crystal element are viewed in plan view, each of the two corner portions have an approximately right angle.

Abstract: An elastic wave device includes a piezoelectric substrate, an interdigital transducer electrode on the piezoelectric substrate, a support on the piezoelectric substrate, including a cavity, and surrounding the interdigital transducer electrode at the cavity, a cover covering the cavity and provided on the support, and a via hole electrode penetrating the cover and the support. The via hole electrode includes a projection portion projecting outward from a side surface portion when seen in a plan view. The projection portion is located within the cover.

Abstract: A MEMS device includes a piezoelectric layer made of a piezoelectric single crystal, a first electrode on a first surface of the piezoelectric layer, and a first layer covering the first surface of the piezoelectric layer. At least a portion of the piezoelectric layer is included in a membrane portion. The first electrode is covered with the first layer and includes a recess. The piezoelectric layer includes a through hole that passes through the piezoelectric layer between a surface of the piezoelectric layer, which is opposite to the first direction, and the recess at a position corresponding to at least a portion of the first electrode.

Abstract: There is provided a vibrational energy harvester comprising: a frame, a flexure assembly coupled to the frame, the flexure assembly comprising a flexure configured to flex in a first direction relative to the frame and a mass fixed to the flexure, wherein when the mass is displaced in the first direction from a rest position, the flexure provides a restoring force on the mass to bring the mass back to the rest position, and a transduction assembly configured to convert movement of the mass and flexure into electrical energy, wherein the frame comprises a cavity positioned so that, if the mass is displaced in the first direction beyond a threshold distance, a portion of the flexure assembly extends into the cavity so that compression or restriction of fluid in the cavity applies an additional force on the flexure assembly.

Abstract: In an example, an energy harvesting system includes a support apparatus and a piezoelectric element. The piezoelectric element may be configured as a plate supported at its periphery by the support apparatus to enable a central portion of the piezoelectric element to move along an axis that is orthogonal to a contact surface of the plate. A body having a mass is configured to move in a direction that is substantially parallel to the axis of the plate and apply force to deform the contact surface of the plate, such that electrical energy is generated by the piezoelectric element based on the applied force.

Abstract: Provided is a vibration power generation element that can have improved property of piezoelectricity and mechanical robustness, while having a reduced cost. A piezoelectric layer (20) is formed on a substrate (10), which is supported on a support member (11) in a cantilever state, with a dielectric layer (102) interposed there between. A pair of comb electrodes (41, 42) are formed on the piezoelectric layer (20) that include comb portions (412, 422) extending in a direction (i.e., transverse direction) perpendicular to the extension direction (i.e., longitudinal direction) of the substrate 10 and disposed so as to be fitted into one another.

Abstract: A piezoelectric energy harvester has a layered structure comprising a first electrode, a polymeric piezoelectric material, and a second electrode, the layered structure coupled to receive mechanical stress from the environment, and the first and second electrode electrically coupled to a power converter. The power converter is adapted to charge an energy storage device selected from a capacitor and a battery. The method of harvesting energy from the environment includes providing a piezoelectric device comprising a layer of a polymeric piezoelectric material disposed between a first and a second electrode; coupling mechanical stress derived from an environment to the piezoelectric device; and coupling electrical energy from the piezoelectric device.

Abstract: A piezoelectric device that includes a film that has a first main surface and a second main surface, and has piezoelectricity; a first substrate; and a first connection member that connects the film to the first substrate. The first connection member is a thermosetting resin, and a curing temperature of the first connection member is lower than a temperature at which the film thermally contracts.

Abstract: Provided is a piezoelectric film including an AlN crystal, and a first element and a second element doped to the AlN crystal. The first element is an element having an ionic radius larger than an ionic radius of Al. The second element is an element having an ionic radius smaller than the ionic radius of Al. Also provided are piezoelectric film laminated body including an underlayer and a piezoelectric film including ScAlN, and a method of manufacturing the same. The underlayer has a crystal lattice having six-fold symmetry or three-fold symmetry. Also provided are a piezoelectric film including ScAlN having a laminated structure of a hexagonal crystal and a cubic crystal, and a method of manufacturing the same. The cubic crystal is doped with an element other than trivalent element.

Abstract: An ultrasonic apparatus includes an ultrasonic transducer, a transmitting circuit, a receiving circuit, a Q-factor measuring circuit, and a frequency measuring circuit. The ultrasonic transducer is a three-terminal ultrasonic transducer that includes a transmitting electrode, a receiving electrode, and a common electrode. The transmitting circuit outputs a driving signal to the transmitting electrode to cause the ultrasonic transducer to transmit ultrasonic waves. The receiving circuit receives a receive signal from the receiving electrode. The frequency measuring circuit measures a resonant frequency of the ultrasonic transducer from a reverberation signal in the receive signal. The Q-factor measuring circuit measures a Q factor of the ultrasonic transducer from the reverberation signal in the receive signal.

Abstract: Packaged surface acoustic wave devices are provided. The packaged surface acoustic wave devices are relatively thin and can have a height of less than 220 micrometers. The packaged surface acoustic wave device includes a photosensitive resin over a conductive structure which may be formed by a plating process. The conductive structure may overlie a cavity-defining structure encapsulating a surface acoustic wave device, the cavity-defining structure including walls and a roof. The photosensitive resin can include a phenol resin. The photosensitive resin can be relatively thin. Edge portions of a piezoelectric substrate can be free from the photosensitive resin.

Abstract: An energy harvesting roadway that includes a plurality of road segments and a power storage device electrically coupled to the plurality of road segments. Each of the plurality of road segments can include a surface asphalt layer, a first conductive asphalt layer located under the surface asphalt layer, a piezoelectric-based asphalt layer located between the first conductive layer and a second conductive layer located above a base asphalt layer. The piezoelectric-based asphalt layer can include a plurality of rigid piezoelectric elements and an insulating filler.

Abstract: A flexible variable frequency ultrasonic therapeutic probe based on thermoacoustic effect of a carbon nanotube film comprises an ultrasonic sound production element, and a heat dissipation layer and an acoustic matching layer located on both sides thereof. The sound production element comprises a carbon nanotube film, metal electrodes and wires, and the shape and size of the sound production element can be adjusted according to the actual functional requirements. When a signal is accessed into the sound production element, the carbon nanotube film produces a corresponding temperature change, which causes the surrounding media to expand and contract and to excite ultrasonic waves. The present invention greatly improves the coupling efficiency between the probe and the subject, reduces the energy loss of ultrasonic waves, and enhances the uniformity of the sound intensity distribution in the affected part.

Abstract: An imaging device includes a two dimensional array of piezoelectric elements. Each piezoelectric element includes: a piezoelectric layer; a bottom electrode disposed on a bottom side of the piezoelectric layer and configured to receive a transmit signal during a transmit mode and develop an electrical charge during a receive mode; and a first top electrode disposed on a top side of the piezoelectric layer; and a first conductor, wherein the first top electrodes of a portion of the piezoelectric elements in a first column of the two dimensional array are electrically coupled to the first conductor.

Abstract: A piezoelectric element includes a piezoelectric element body, a first external electrode disposed on a first main surface of the piezoelectric element body, and a second external electrode disposed on a second main surface of the piezoelectric element body. A vibration member includes an electrically conductive third main surface and a fourth main surface opposing the third main surface. The vibration member is disposed such that the third main surface opposes the first external electrode. A protective layer covers the piezoelectric element. The protective layer includes a first resin layer and a second resin layer. The first resin layer covers the piezoelectric element body and the second external electrode. The second resin layer is disposed between the first external electrode and the third main surface and joins the first external electrode and the third main surface. The first resin layer is smaller in hardness than the second resin layer.