Disclosed is a self-powered vibration damper based on piezoelectricity and a control method. The damper comprises a loading platform, an energy collecting mechanism, a curved leaf spring, a vibration control mechanism and a substrate all connected in sequence, the circuit system comprises a rectifier circuit, a DC-DC voltage conversion circuit, an energy storage circuit, a control circuit and a charging battery, a first piezoelectric stack is connected with the input end of the rectifier circuit, the output end of the rectifier circuit is connected with the input end of the DC-DC voltage conversion circuit, the output end of the DC-DC voltage conversion circuit is connected with the input ends of the energy storage circuit and the charging battery, the output end of the energy storage circuit is connected with the input end of the control circuit, the output end of the control circuit is connected with the second piezoelectric stack.

A vibration module is disclosed. The vibration module includes a film, a piezoelectricity device, and a substrate. The film has a first surface. The piezoelectricity device is disposed on the first surface. The substrate is disposed on the first surface by in-mold injection method, which contacts and surrounds the piezoelectricity device.

A sensor device that senses proper acceleration. The sensor device includes a substrate, a spacer layer supported over a first surface of the substrate, at least a first cantilever beam element having a base and a tip, the base attached to the spacer layer, and which is supported over and spaced from the substrate by the spacer layer. The at least first cantilever beam element further including at least a first layer comprised of a piezoelectric material, a pair of electrically conductive layers disposed on opposing surfaces of the first layer, and a mass supported at the tip portion of the at least first cantilever beam element.

A piezoelectric rotary optical mount including a clamp including a first hole to hold a hollow member, wherein a contact between the clamp and the hollow member generates a coefficient of friction; a bias element adjacent to the first hole to apply a force to control rotational movement of the hollow member by adjusting the coefficient of friction; and a piezoelectric element to actuate the bias element to apply the force. The clamp may include a housing body including a first end and a second end, wherein the first hole extends in a first axis through the housing body to accommodate the hollow member; a pair of elongated cutout regions extending from the first hole towards the second end to define the bias element; and a second hole adjacent to at least one of the cutout regions to accommodate the piezoelectric element.

Provided is an actuator having a piezoelectric element, a diaphragm to which the piezoelectric element is bonded and vibrates according to expansion and contraction displacement of the piezoelectric element, and a first spacer and a second spacer configured to fix both ends of the diaphragm in expansion and contraction displacement direction of the piezoelectric element to a base member. The driving characteristics of the actuator are determined by an effective length of the diaphragm between the first spacer and the second spacer.

The present application relates to an energy conversion apparatus. The energy conversion apparatus comprises: an upper conductive layer; a lower conductive layer, which is arranged below the upper conductive layer; and at least one piezoelectric micro/nano unit and a fluid, which are arranged between the upper conductive layer and the lower conductive layer, wherein the piezoelectric micro/nano unit has a piezoelectric property and is immersed in the fluid. The present application further relates to a preparation method for an energy conversion apparatus and the use thereof.

A piezoelectric coaxial sensor includes: a sensor portion including a center conductor having a linear shape, a polymer piezoelectric layer containing polyvinylidene fluoride and that covers an outer peripheral surface of the center conductor, and a first outer conductor that surrounds an outer peripheral surface of the polymer piezoelectric layer; and jacket layers that each include a film having a tape shape wound to surround an outer peripheral surface of the sensor portion. The film of at least one of the jacket layers exposed to the outside of the piezoelectric coaxial sensor among the other jacket layers is adhered to a member in contact with an adhesive layer by the adhesive layer. The adhesive layer includes a thermoplastic resin having a melting point of 120° C. or lower.

A piezoelectric coaxial sensor includes: a sensor portion including a center conductor having a linear shape, a polymer piezoelectric layer containing polyvinylidene fluoride and that covers an outer peripheral surface of the center conductor, and a first outer conductor that surrounds an outer peripheral surface of the polymer piezoelectric layer; and jacket layers that each include a film having a tape shape wound to surround an outer peripheral surface of the sensor portion. The film of at least one of the jacket layers exposed to the outside of the piezoelectric coaxial sensor among the other jacket layers is adhered to a member in contact with an adhesive layer by the adhesive layer. The adhesive layer includes a thermoplastic resin having a melting point of 120° C. or lower.

A pliable cover adapted to cover an active area of an ultrasound probe is described. The ultrasound probe includes a plurality of ultrasound transducer elements. The pliable cover includes a polymer layer that holds a coupling agent (4) that couples the ultrasound transducer elements to a body surface and a regular pattern of channels extending through the pliable cover. An ultrasound probe arrangement is also described and includes the pliable cover. An ultrasound system including the ultrasound probe arrangement, and a method of positioning the ultrasound probe in a region of a body are also described.

The piezoelectric microphone chip includes a single thin plate, a diaphragm support structure that is provided on one surface of the thin plate and includes an outer edge support portion that supports an outer edge of the thin plate and a separation support portion that separates the thin plate into a plurality of diaphragms in association with the outer edge support portion, a single or a plurality of piezoelectric conversion portions formed by laminating a first electrode, a piezoelectric film, and a second electrode sequentially from a diaphragm side on each of the diaphragms, and a signal detection circuit that detects outputs from the piezoelectric conversion portions provided on the plurality of diaphragms, and a relationship among a thickness t.sub.1 of the outer edge support portion, a thickness t.sub.2 of the separation support portion, and a thickness td of the thin plate 10 is set to 13.3×td<t.sub.2<t.sub.1−20 μm.