A method for manufacturing an electronic component is provided where resin adhesive rarely spreads before curing. The method includes providing a first sealing member and forming a frame-shaped glass layer on a principal surface of the first sealing member. Moreover, the first sealing member is cut into multiple first sealing members and second sealing members are bonded with resin adhesive to inner frame regions on the principal surface of the first sealing member defined by the glass layer.

A brushless electric motor is disclosed. A group of permanent magnets are physically attached to a group of piezoelectric actuators which push them toward or pull them away from a second group of permanent magnets when the piezoelectric actuators are electrically activated. The second group of permanent magnets may also be pushed and pulled with a second group of piezoelectric actuators. Alternate configurations using electromagnets are also disclosed.

A novel configuration for the groups of electromagnets which maximizes efficiency in a piezoelectrically actuated motor is also disclosed.

A filter includes: an input terminal; an output terminal; and a ladder circuit that includes one or more series acoustic wave resonators connected in series between the input terminal and the output terminal and one or more parallel acoustic wave resonators connected in parallel between the input terminal and the output terminal, and in which characteristic impedance of at least one point in a pathway between the input terminal and the output terminal in a passband is greater than at least one of input impedance of the input terminal and output impedance of the output terminal in the passband.

The present invention relates to a holder (5) for a piezoelectric component (1), having a clamping device (6) and two contact elements (8) which contain a conductive rubber material, wherein the clamping device (6) is designed to clamp the piezoelectric component (1) between the contact elements (8) in a closed state, and wherein the contact elements (8) are in electrical contact with the piezoelectric component (1) in the closed state of the clamping device (6).

A ladder filter defines a transmission filter and has a structure such that a resonator located closest to an input terminal is a parallel-arm resonator, and the parallel-arm resonator located closest to the input terminal includes a plurality of division resonators connected in parallel. At least one division resonator has a resonant frequency and an anti-resonant frequency that are located outside a passband of the ladder filter, and the remaining division resonators and parallel-arm resonators each have an anti-resonant frequency located within the passband.

In manufacturing method of a cylindrical piezoelectric element, a cylindrical piezoelectric material is formed by molding a piezoelectric material into a cylindrical shape and subjecting the molded piezoelectric material to calcination. A reference electrode is provided on an inner circumferential surface of the cylindrical piezoelectric material. Drive electrodes are provided in a circumferential direction so that the drive electrodes are extending in an axial direction from one end to the other end on an outer circumferential surface. A polarization electrode is provided at a part of the circumferential surface in the vicinity of the one end. A predetermined voltage is applied between the polarization electrode and the reference electrode. The polarization electrode is removed from the cylindrical piezoelectric material.

An illustrative humidity sensor may include a substrate and a sensing field effect transistor. The sensing field effect transistor may comprise a source formed on the substrate, a drain formed on the substrate, a gate, and a piezoelectric layer disposed over the gate. Another illustrative humidity sensor may comprise a substrate, a semi-conductor layer disposed over the substrate, a piezoelectric layer disposed over the semi-conductor layer, a first electrode disposed on the piezoelectric layer, and a second electrode disposed on the piezoelectric layer. In some instances, the piezoelectric layer may comprise aluminum nitride.

A piezoelectric assembly includes at least two piezoelectric components, a positive circuit board, and a negative circuit board. Each piezoelectric component includes a main body portion and a connecting portion. Respective first surfaces of the main body portion and the connecting portion are a positive electrode, and respective second surfaces of the main body portion and the connecting portion are a negative electrode. Main body portions of the at least two piezoelectric components are stacked, connecting portions of the at least two piezoelectric components are distributed in a staggered manner along a set edge. The positive circuit board is coupled to the first surface of the connecting portion, and the negative circuit board is coupled to the second surface of the connecting portion.

An actuator device has an electroactive polymer actuator and an integrated piezoelectric transformer. At least a secondary side of the integrated piezoelectric transformer shares a piezoelectric electroactive polymer layer with the electroactive polymer actuator, so that lower external voltages can be applied to the actuator device. A diode is connected between the secondary side of the integrated piezoelectric transformer and the electroactive polymer actuator.

A piezoelectric transformer that includes a base and an upper layer supported by the base. The upper layer includes a first piezoelectric layer that includes the portion of the upper layer that is interposed between an output electrode and an intermediate electrode, and a second piezoelectric layer that is superposed with the first piezoelectric layer and includes the portion of the upper layer interposed between the intermediate electrode and an input electrode in at least n vibration portions. Moreover, the input electrode includes multiple input electrode pieces and the output electrode includes multiple output electrode pieces. In addition, wiring lines are routed such that voltages of opposite phases can be respectively applied to a first input electrode piece group and a second input electrode piece group with the potential of the intermediate electrode serving as a reference.