103results about "Device details" patented technology

The invention describes devices for performing thermodynamic work on a fluid, such as pumps, compressors and fans. The thermodynamic work may be used to provide a driving force for moving the fluid. Work performed on the fluid may be transmitted to other devices, such as a piston in a hydraulic actuation device. The devices may include one or more electroactive polymer transducers with an electroactive polymer that deflects in response to an application of an electric field. The electroactive polymer may be in contact with a fluid where the deflection of the electroactive polymer may be used to perform thermodynamic work on the fluid. The devices may be designed to efficiently operate at a plurality of operating conditions, such as operating conditions that produce an acoustic signal above or below the human hearing range. The devices may be used in thermal control systems, such as refrigeration system, cooling systems and heating systems.

A method for fabricating a film bulk acoustic resonator (FBAR) includes depositing a dielectric layer on a substrate, providing a sacrificial layer on part of the dielectric layer; providing a bottom electrode on part of the sacrificial layer on part of the dielectric layer; providing a piezoelectric layer on the bottom electrode; patterning a top electrode on the piezoelectric layer; and removing the sacrificial layer. The substrate may have a cavity receiving the sacrificial layer. As a result, a cantilevered resonator having an air gap between the bottom electrode and the dielectric layer may be simply fabricated.

In a method of producing a lithium niobate substrate by the use of a lithium niobate crystal grown by the Czochralski process, the lithium niobate crystal is heat-treated at a temperature of from 300° C. or more to less than 500° C. in the state the lithium niobate crystal is buried in a powder constituted of at least one element selected from the group consisting of Al, Ti, Si, Ca, Mg and C, or in the state the lithium niobate crystal is held in a container constituted of at least one element selected from the group consisting of Al, Ti, Si, Ca, Mg and C.

Provided is a method of fabricating a piezoelectric microspeaker. According to the method, drive units having a piezoelectric layer and an electrode are symmetrically formed so as to be disposed over and under a diaphragm, respectively. When a thin conductive layer is used as the diaphragm, the diaphragm can be used as a common electrode. On the other hand, when a thin non-conductive layer is used as the diaphragm, a common electrode is necessary in each of the drive units.

A flexural vibration piece includes: a base portion; and a vibration arm extending from the base portion, wherein the vibration arm has first and second main faces which are arranged to be opposite each other, the first and second main faces respectively have first and second grooves which are formed in the longitudinal direction of the vibration arm, the first groove has a plurality of first groove portions which are divided in the longitudinal direction of the vibration arm and arranged to be alternately shifted on both sides with respect to the longitudinal center line of the vibration arm in the longitudinal direction, the second groove has a plurality of second groove portions which are divided in the longitudinal direction of the vibration arm, and arranged to be alternately shifted on both sides with respect to the longitudinal center line of the vibration arm in the longitudinal direction and on an opposite side to the first groove portions with respect to the longitudinal center line, and a predetermined voltage is applied to first excitation electrodes provided at the first groove and the second groove and second excitation electrodes provided on both side faces of the vibration arm, such that the vibration arm flexural-vibrates in the in-plane direction of the first or second main face.

A micromechanical element includes a movable functional element, a first retaining element, a second retaining element, a third retaining element, and a fourth retaining element. The first retaining element and the functional element are connected at a first junction, the second retaining element and the functional element are connected at a second junction, the third retaining element and the functional element are connected at a third junction, and the fourth retaining element and the functional element are connected at a fourth junction. In addition, the first retaining element and the second retaining element each include a piezoelectric driving element, the driving element of the first retaining element and the driving element of the second retaining element being configured to move the functional element in accordance with electric excitation.

A piezoelectric element includes: a lower electrode film provided on a substrate; a piezoelectric layer provided on the lower electrode film; and an upper electrode film provided on the piezoelectric layer, wherein the lower electrode film includes columnar crystals of platinum, and an oxide exists in the grain boundaries of the crystals of platinum.

A resonator element capable of improving impact resistance is provided. A quartz crystal resonator element is a resonator element formed by etching a Z plate which is cut at predetermined angles with respect to the crystal axes of a quartz crystal. The quartz crystal resonator element includes a base, a pair of resonating arms extending from the base in the Y-axis direction, and a positive X-axis notch and a negative X-axis notch formed by notching the base in the X-axis direction. The positive X-axis notch is formed by notching the base from the negative side of the X axis towards the positive side so that the width of the positive X-axis notch increases as it approaches the outer circumference.

The various embodiments of the present disclosure relate generally bulk-acoustic-wave resonators. An exemplary embodiment of the present invention provides a bulk-acoustic-wave resonator comprising an acoustic reflector, a substantially c-axis oriented hexagonal crystal structure, and a plurality of electrodes. The crystal structure is solidly-mounted to the acoustic reflector. The bulk-wave resonator resonates in at least two non-harmonically-related operational modes.

A stacked crystal unit includes: a first crystal plate in which a vibration member links to an outer circumferential frame portion, and a pair of extending electrode extends to the frame portion from excitation electrodes; and a second and third crystal plates which have a concave portion in an area opposite to the vibration member and whose open end surfaces are joined by direct bonding to both principal surfaces of the frame portion in the first crystal plate. The extending electrodes are electrically extended to an outer surface of at least one of the second and third crystal plates via electrode through-holes provided in the frame portion. The electrode through-hole includes: a first electrode through-hole penetrating through the frame portion from the principal surface of the frame portion where the extending electrode extends; and a second electrode through-hole provided in the second or third crystal plate.

A physical quantity sensor includes an IC chip and a package base mounted with the IC chip. The package base includes a first wiring layer provided with bonding pads connected to the IC chip via a bonding wire, a second wiring layer overlapping the first wiring layer in plan view, and an insulating layer provided between the first wiring layer and the second wiring layer. A contour of a wiring pattern provided on the second wiring layer (of the second wiring layer) is arranged in a position not overlapping the bonding pads in plan view.

The present invention provides an inertial energy scavenger that includes at least one piezoelectric element held by a housing, a proof mass that is movable within the housing in a direction parallel to the piezoelectric element, and a mechanical assembly disposed between the proof mass and the piezoelectric element. The mechanical assembly transfers work from the proof mass to the piezoelectric element, where the work from the proof mass is a first force along a first distance and the work to the piezoelectric element is a second force along a second distance. The first distance is greater than the second distance and the first force is smaller than the second force. Force amplification is determined by the geometry of the mechanical transfer assembly and can range anywhere from just above 1 to at least 10, where some embodiments include a bi-lever configuration, a tube-shaped configuration and a reverse actuation configuration.

A method for bonding one surface to a gold surface comprises the following steps: (a) mixing a solution containing sulfur-containing alkoxysilane; (b) treating the gold surface with the solution; (c) adding sulfur-containing alkoxysilane to an adhesive material; (d) applying the adhesive material with additive on one of both surfaces; and (e) pressing the surfaces against each other while the adhesive material therebetween sets.

A magneto-electric coupling component is prepared as setting piezoelectric component between two magnetostrictive plates in order to convert displacement generated by said magnetostrictive plates to be electric signal and holding said piezoelectric component being coupled together with two magnetostrictive plates by clamping fixture.

The present invention provides for a composition comprising a thin film of BiFeO₃ having a thickness ranging from 20 nm to 300 nm, a first electrode in contact with the BiFeO₃ thin film, and a second electrode in contact with the BiFeO₃ thin film; wherein the first and second electrodes are in electrical communication. The composition is free or essentially free of lead (Pb). The BFO thin film is has the piezoelectric property of changing its volume and/or shape when an electric field is applied to the BFO thin film.

The invention provides a magnetoelectric composite structure. The magnetoelectric composite structure includes a piezoelectric ceramic slice, a silver electrode placed on the piezoelectric ceramic slice, a magnetostrictive material layer and an ink layer placed between the piezoelectric ceramic slice and the magnetostrictive material layer and used for isolating the piezoelectric ceramic slice from the magnetostrictive material layer. The magnetoelectric composite structure can improve the magnetoelectric output signal-to-noise ratio.