Abstract: An oscillatory wave drive device has an oscillatory wave driving unit having an electromechanical energy conversion element having drive phases and a detection phase, a diaphragm, and a rotor, in which a traveling wave is generated on the surface of the diaphragm of the electromechanical energy conversion element to drive the rotor, and the driving speed of the rotor is controlled based on a signal of the phase difference detecting unit. In the oscillatory wave drive device, a detection phase voltage step-down unit and a drive phase voltage step-down unit each containing a resistance voltage dividing circuit having at least two resistors are provided and the voltage dividing ratio in the resistance voltage dividing circuit of the detection phase voltage step-down unit is lower than 1/1 and higher than 1/20.

Abstract: A system for emitting an ultrasonic signal is provided. The system includes a first ultrasonic transducer and a second ultrasonic transducer. A plate of the first ultrasonic element faces a plate of the second ultrasonic element such that the plate of the first ultrasonic element is spaced apart from the plate of the second ultrasonic element by a gap. During operation of the first and second ultrasonic transducers, a uniform or omnidirectional ultrasonic signal may be emitted from the gap.

Abstract: A piezoelectric ceramic includes a perovskite-type metal oxide containing barium titanate, and Mn. When a surface thereof along the remanent polarization direction is subjected to X-ray diffraction analysis at room temperature, the ratio of the diffraction intensity of the (002) plane to the diffraction intensity of the (200) plane is 1.0 or more, the diffraction peak of the (002) plane has a half width of 1.2° or less, and the lattice constant of the c-axis thereof and the lattice constant of the a-axis thereof satisfy the relationship 1.004?c/a?1.010.

Abstract: A drive device includes a driven body provided on an opening of a case, and a polymer actuator which is bent and deformed in a height direction and movably supports the driven body in the height direction. A first conductive portion is provided on the case side, a second conductive portion is provided on the driven body side, and the first conductive portion and the second conductive portion configure a plurality of contact portions. When the driven body is raised by the polymer actuator, the first conductive portion and the second conductive portion come into contact with each other by the plurality of contact portions, and thus, the raised state of the driven body is detected.

Abstract: A linear actuator especially for adjustable furniture comprises a spindle (16) with a spindle nut (16a) for bringing about the adjustment of the article of furniture. At the end of the spindle (16) there is a bearing (17) for mounting of this in the actuator. The spindle/spindle nut (16,16a) is driven by an electric motor (27) through a transmission (28). For preventing accidents and/or damage during the adjustment of the article of furniture the actuator is equipped with a squeeze protection based on a piezo element (22). This piezo element (22) is arranged in connection with the bearing (17) for registering the forces or deflections of the forces affecting the spindle (16). In that the piezo element (22) has a through-going hole for the spindle the mounting of the piezo element (22) is simplified and further it has turned out that a particularly good signal/noise ratio is obtained.

Abstract: A motor includes a rotor module and a stator module. The rotor module includes electro-active polymer modules which change their physical size depending on electrical activation or deactivation. The stator module includes a base and a plurality of magnets mounted on two fixing plates of the base. The rotor module comprises a rotor and a coil. Precise displacement by the motor is obtained by electrically activating or deactivating the electro-active polymer modules.

Abstract: Wind turbine consisting of an anchoring to the ground or to a base and a mast, the natural oscillation frequency of which is purposely adjusted to the frequency of appearance of the air vortices or eddies produced after the collision of a laminar and stationary airflow against the surface thereof. The aeroelastic energy thus absorbed is converted into electrical energy due to the use of materials with high electromechanical coupling.

Abstract: An acoustic resonator device including a piezoelectric layer, a first electrode disposed adjacent to a first surface of the piezoelectric layer, and a second electrode disposed adjacent to a second surface of the piezoelectric layer. At least one of the first electrode and the second electrode includes a first conductive layer disposed adjacent to the piezoelectric layer and having a first acoustic impedance, and a second conductive layer disposed on a side of the first conductive layer opposite the piezoelectric layer and having a second acoustic impedance greater than the first acoustic impedance. The acoustic resonator device further includes at least one lateral feature for increasing quality factor Q of the acoustic resonator structure. The at least one lateral feature includes at least one of an air-ring between the piezoelectric layer and the second electrode, and a frame on at least one of the first electrode and the piezoelectric layer.

Abstract: A crystal resonator includes: lower glass plates on which first electrodes are formed so as to extend from side surfaces to a bottom surface of the lower glass plates; a crystal plate which is provided over the lower glass plates and on which second electrodes to be coupled to the first electrodes are formed on a surface in contact with the lower glass plates; and an upper glass plate which is provided over the crystal plate; wherein the side surfaces of the lower glass plates on which the first electrodes are formed are provided with a protrusion that extends in parallel with a top surface and the bottom surface of the lower glass plates and that extends from one end to the other end of each of the side surfaces, and wherein the first electrodes are formed on the side surfaces that include surfaces of the protrusion.

Abstract: In one embodiment, acoustic devices are formed on a substrate which is then placed on a first HAF layer, a screen, and a second HAF layer. The layers of HAF each have apertures aligned with acoustic ports of the devices. The substrate is heated such that the first layer of HAF adheres to the substrate and the screen and the second layer of HAF adheres to the screen. The substrate is cut to separate the devices into modules. In other embodiments, a waterproof membrane covering the acoustic port of an acoustic module may be bonded to a screen to form a gap such that it moves under pressure until restrained by the screen. In still other embodiments, back volume covers for acoustic devices are formed by stacking and heating a first HAF layer, a glass-reinforced epoxy laminate layer, a second HAF layer, and a top layer on a substrate.

Abstract: An ultrasonic generator that is capable of increasing output sound pressure is provided. An ultrasonic generating element is accommodated in an accommodation space that is formed by a first case member and a second case member. The ultrasonic generating element is secured to the first case member via a plurality of first supporting members. The first supporting members are provided so that, in a first acoustic path that includes a space formed between a bottom surface of the ultrasonic generating element and a top surface of the first case member and that extends to sound-wave emission holes, a transverse section of the acoustic path has a portion that becomes smaller than another portion thereof.

Abstract: Apparatus and method that includes providing a variable-parameter electrical component in a high-field environment and based on an electrical signal, automatically moving a movable portion of the electrical component in relation to another portion of the electrical component to vary at least one of its parameters. In some embodiments, the moving uses a mechanical movement device (e.g., a linear positioner, rotary motor, or pump). In some embodiments of the method, the electrical component has a variable inductance, capacitance, and/or resistance. Some embodiments include using a computer that controls the moving of the movable portion of the electrical component in order to vary an electrical parameter of the electrical component. Some embodiments include using a feedback signal to provide feedback control in order to adjust and/or maintain the electrical parameter.

Abstract: The invention relates to an ultrasonic sensor device (1) for a motor vehicle, comprising an ultrasonic sensor (2), which has a membrane (5) for emitting and/or receiving ultrasonic waves, and comprising a stiffening unit (15) for attachment to a trim element (27) of the motor vehicle and for stiffening the trim element (27), wherein the stiffening unit (15) has a through-opening (17) for the membrane (5) of the ultrasonic sensor (2), wherein the stiffening unit (15) is formed from at least two separate stiffening elements (18 to 21) for attachment to a trim element (27).

Abstract: A piezoelectric power generation system includes a housing defining an opening therethrough and a support structure disposed within the housing, the support structure comprising a plurality of portions. The piezoelectric power generation system also includes one or more piezoelectric elements disposed between two of the plurality of portions of the support structure within the housing. Movement or vibration in the support structure compresses the one or more piezoelectric elements, wherein the one or more piezoelectric elements generate electric energy when compressed. The piezoelectric power generation system further includes one or more exciters coupled to the support structure, wherein the exciters move or vibrate when acted on by a flow of fluid, wherein the motion of vibration of the one or more exciters is translated to the support structure and ultimately to the one or more piezoelectric elements.

Abstract: A piezoelectric actuator includes a housing body and lid wherein the housing body defines an open-ended cylindrical interior chamber extending along a displacement axis. The lid bolts to the body transverse to the open end allowing easy access to an electrostrictive assembly disposed within the chamber. The electrostrictive assembly includes an electrostrictive element affixed at one end to the housing by a cup element with an outermost cylindrical surface, and at an opposite, and free, end, to a driver having a portion with a outermost cylindrical surface. The outermost cylindrical surfaces both include circumferential sealing elements, for example, circumferential grooves in which resilient a sealing O-ring resides, or circumferential wiper seals. The assembly is dimensioned to fit wholly within the chamber, with the circumferential sealing elements establishing a hermetic seal while allowing sliding motion of the free end of the electrostrictive element, and the driver, along the displacement axis.

Abstract: A surface-guided bulk wave transducer includes a stack of an acoustic substrate, an electric ground plane, and a network of synchronous acoustic excitation sources with two combs of elementary piezoelectric transducers alternately interlaced two-by-two according to a periodic network step corresponding to a propagation mode of a surface-guided bulk wave of the acoustic substrate. Each elementary piezoelectric transducer includes a single and different rod with a parallelepipedal shape for which the nature, the cut of the piezoelectric material, the height h, and the width are selected for increasing the electromechanical coupling coefficient of the transducer assembly to a high level.

Abstract: Disclosed is a piezoelectric element wherein a lower electrode made of Pt, a buffer layer made of PLT, and a piezoelectric thin film to be a perovskite ferroelectric thin film are formed in this order on a substrate. The average crystal grain size of Pt forming the lower electrode is not smaller than 50 nm and not larger than 150 nm.

Abstract: A resonance apparatus that processes an electrical loss using a conductive material and a method of manufacturing the resonance apparatus are provided. The resonance apparatus includes a lower electrode formed at a predetermined distance from a substrate, and a piezoelectric layer formed on the lower electrode. The resonance apparatus further includes an upper electrode formed on the piezoelectric layer, and a conductive layer formed on the upper electrode or the lower electrode.

Abstract: A piezoelectric multi-layer component includes a piezoelectric main body, which has an inlet area and an outlet area. In the outlet area or in the inlet area at least two adjacent layers are polarized antiparallel to each other and at least two adjacent layers are polarized parallel to each other.

Abstract: Switchable and/or tunable filters, methods of manufacture and design structures are disclosed herein. The method of forming the filters includes forming at least one piezoelectric filter structure comprising a plurality of electrodes formed on a piezoelectric substrate. The method further includes forming a fixed electrode with a plurality of fingers on the piezoelectric substrate. The method further includes forming a moveable electrode with a plurality of fingers over the piezoelectric substrate. The method further includes forming actuators aligned with one or more of the plurality of fingers of the moveable electrode.