A flexible vibration module is disclosed. The flexible vibration module includes a piezoelectric composite layer, including: a plurality of piezoelectric portions each having a piezoelectric characteristic, where at least two of the plurality of piezoelectric portions have different sizes; and a flexible portion between the plurality of piezoelectric portions.

A piezoceramic ultrasonic transducer for a vehicle includes: a disc-shaped piezoceramic oscillator configured to generate ultrasonic waves; a printed circuit board configured to provide electric power to the disc-shaped piezoceramic oscillator; and a composite elastomeric element arranged between the disc-shaped piezoceramic oscillator and the printed circuit board, the composite elastomeric element being configured to support the piezoceramic oscillator on the printed circuit board. The composite elastomeric element includes a first elastomeric compound element and a second elastomeric compound element. The first elastomeric compound element includes a first temperature dependent viscoelasticity and supports the piezoceramic oscillator on the printed circuit board in a first temperature range and the second elastomeric compound element includes a second temperature dependent viscoelasticity and supports the piezoceramic oscillator on the printed circuit board in a second temperature range different from the first temperature range.

The present application relates to stacked piezoelectric composites comprising piezoelectric structures. Suitably, the composites are useful as tissue-stimulating implants, including spinal fusion implants. The present application also relates to methods of making stacked piezoelectric composites.

A piezoelectric composition comprises a plurality of crystal particles, wherein the piezoelectric composition includes bismuth, iron, barium, titanium, and oxygen; the crystal particle include a core and a shell having a contents of bismuth higher than that in the core and covering the core; and the total area of the cross sections of the cores exposed to the cross section of the piezoelectric composition is expressed as S.sub.CORE, the total area of the cross sections of the shells exposed to the cross section of the piezoelectric composition is expressed as S.sub.SHELL, and 100.Math.S.sub.CORE/(S.sub.CORE+S.sub.SHELL) is 50 to 90.

An ultrasonic Lamb wave transducer for non-invasive measurement and for emitting and/or receiving an ultrasonic Lamb wave pulse, an emission and a reception of the ultrasonic Lamb wave having an emission direction and a reception direction, respectively, the ultrasonic Lamb wave pulse being defined by at least one parameter, includes: at least one piezocomposite actuator for controlling the emission direction of the ultrasonic Lamb wave by emitting acoustic radiation at frequencies that are appropriate for generating ultrasonic Lamb waves.

The present invention relates to a method to fabricate a tamper respondent assembly. The tamper respondent assembly includes an electronic component and an enclosure fully enclosing the electronic component. The method includes printing, by a 3-dimensional printer, a printed circuit board that forms a bottom part of the enclosure and includes a first set of embedded detection lines for detecting tampering events and signal lines for transferring signals between the electronic component and an external device. The electronic component is assembled on the printed circuit board, and a cover part of the enclosure is printed on the printed circuit board. The cover part includes a second set of embedded detection lines. Sensing circuitry can be provided for sensing the conductance of the first set of embedded detection lines and the second set of embedded detection lines to detect tampering events.

A flexible vibration module is disclosed. The flexible vibration module includes a piezoelectric composite layer, including: a plurality of piezoelectric portions each having a piezoelectric characteristic, where at least two of the plurality of piezoelectric portions have different sizes; and a flexible portion between the plurality of piezoelectric portions.

The present invention relates to a energy conversion device (100) configured to convert a light signal into an electrical signal, comprising: an actuator element (50), substantially planar, having at least one activatable portion (30), said activatable portion comprising a photomobile polymeric material; a transducer element (60), substantially planar, having at least a portion of piezoelectric material; wherein said actuator element (50) is coupled to said transducer element (60) so that, at a light beam incident on said photomobile polymeric material, a movement of said transducer element (60) is activated through a movement of said activatable portion (30), said movement of said transducer element (60) providing the generation of a potential difference at the terminal ends of said portion of piezoelectric material.

The present invention also relates to a method of production of the aforesaid device.

A lead-free lithium doped potassium sodium niobate piezoelectric ceramic material in powdered form and having a single crystalline phase and uses thereof are described. Methods of making the said piezoelectric ceramic material are also described.

In one general aspect, a composite foam comprises a non-layered mixture of a polymeric foam with a plurality of voids; and a plurality of conductive fillers disposed in the polymeric foam. The conductive fillers are disposed in an even manner from outer surface to outer surface. In some implementations, the conductive fillers are up to 25% by weight of the composite foam. In some implementations, the composite foam may be used as padding. In some implementations, the composite foam may be used as a strain gauge.