Abstract: A piezoelectric element includes a first electrode, a second electrode, and a piezoelectric layer provided between the first and second electrodes. In the piezoelectric element, the piezoelectric layer is made from a perovskite composite oxide represented by Pb(Ni, Nb, Zr, Ti)O3 and the total of the Ni and Nb contents in the perovskite composite oxide is not less than 1 [mol %] and not more than 5 [mol %] based on a total content of elements contained in a B site.
Abstract: An ultrasonic sensor includes a substrate in which an opening is formed; a vibration plate that is provided on the substrate so as to block the opening; and a piezoelectric element including a first electrode, a piezoelectric layer, and a second electrode that are stacked on an opposite side of the opening of the vibration plate, in which when a direction in which the first electrode, the piezoelectric layer, and the second electrode are stacked is a Z direction, and a portion that is completely overlapped by the first electrode, the piezoelectric layer, and the second electrode in the Z direction is an active portion, a plurality of active portions are provided so as to face the each opening, and a columnar member is provided between the adjacent active portions.
Abstract: A piezoelectric driving device includes a vibrating plate, and a piezoelectric vibrating body including a substrate, and piezoelectric elements provided on the substrate. The piezoelectric element includes a first electrode, a second electrode, and a piezoelectric body, and the first electrode, the piezoelectric body, and the second electrode are laminated in this order on the substrate. The piezoelectric vibrating body is installed on the vibrating plate so that the piezoelectric element is interposed between the substrate and the vibrating plate. A wiring pattern including a first wiring corresponding to the first electrode and a second wiring corresponding to the second electrode is formed on the vibrating plate, the first electrode and the first wiring are connected to each other through a first laminated conducting portion, and the second electrode and the second wiring are connected to each other through a second laminated conducting portion.
Abstract: The invention relates to an ultrasonic motor, comprising a piezoelectric ultrasonic actuator (1) having four friction elements (4) disposed thereon, a friction surface (6) which is in frictional contact with the friction elements, and an electrical excitation device (16), wherein the ultrasonic actuator is in the shape of a ring or hollow cylinder, having an inner circumferential surface (14), an outer circumferential surface (12) and two planar end surfaces (5) connecting the inner and the outer circumferential surfaces.
Abstract: Provided is a piezoelectric driving device for a motor including: a vibrating plate which includes a fixed portion and a vibrator portion in which a piezoelectric element is provided and which is supported by the fixed portion; and a contact portion which comes into contact with a driven body and transmits motion of the vibrating plate to the driven body, in which the fixed portion, the vibrator portion, and the contact portion are provided along an X direction in this order, when seen in a Y direction, when two directions parallel to a main surface of the vibrating plate and orthogonal to each other are set as the X direction and the Y direction and a direction orthogonal to the main surface of the vibrating plate is set as a Z direction.
Abstract: An actuator providing a large shear movement in a chosen direction. The angle of inclination of the fibers relative to the chosen direction is larger than 2° and smaller than 40°; the spaces between the piezoelectric fibers of the active layer are filled with an incompressible elastic material; the active layer comprises at least two dimensionally stable elongate elements parallel to the chosen direction; the ends of each fiber are adhesively bonded to said dimensionally stable elements using a rigid adhesive; and said dimensionally stable elements are adhesively bonded, by a rigid adhesive, to said electrode-bearing layers.
September 11, 2014
Date of Patent:
March 19, 2019
OFFICE NATIONAL D'EÉTUDES ET DE RECHERCHES AÉROSPATIALES (ONERA)
Hugues Mercier Des Rochettes, Didier Joly
Abstract: A roll of interlayer, suitable for laying between layers of pavement, the roll of interlayer includes at least one layer of interlayer material, a plurality of piezoelectric elements; at least one transmission line coupled to the plurality of piezoelectric elements for transmitting power generated by the plurality of piezoelectric elements to an output. The interlayer is in the form of an elongate, flexible sheet.
Abstract: A vibration wave motor includes a vibration plate having a flat plate portion and protruding portions, a piezoelectric element that performs high-frequency vibration, a friction member contacting the protruding portions, and a first natural vibration mode and a second natural vibration mode, which are excited in the vibration plate by the high-frequency vibration, the vibration plate and the friction member moving relatively to each other, maximum amplitude generated on tip ends of the protruding portions by the first natural vibration mode is larger than maximum amplitude generated on tip ends of the protruding portions by the second natural vibration mode, a resonance frequency of the first natural vibration mode is lower than a resonance frequency of the second natural vibration mode, and amplitudes of the first natural vibration mode and the second natural vibration mode in a frequency range at a time of drive substantially coincide with each other.
Abstract: For a component operating with acoustic waves, it is proposed to provide a compensation layer on the component for compensating for a negative temperature coefficient of the frequency, which includes a material based on a chemical compound made up of at least two elements, which has a negative thermal expansion coefficient.
July 9, 2015
Date of Patent:
March 5, 2019
Werner Ruile, Philipp Michael Jäger, Matthias Knapp
Abstract: A piezoelectric motor comprising one or more concentric stator rings arranged to transfer energy and provide torque to an engine rotor or to an engine transmission. Such a piezo-electric motor improves spatial integration of an engine turning motor in a gas turbine engine.
Abstract: A converter including a transducer layer which moves anchoring points to deform a piezoelectric diaphragm by bending. The converter includes a rigid arm between each anchoring point and a point for securing to the piezoelectric diaphragm to which it is attached, the rigid arm being tensioned between the anchoring point and the securing point and configured to transform movement of the anchoring points into a movement that deforms the piezoelectric diaphragm between bent and less bent positions. The securing point is located at the mid-point when the ends of the piezoelectric diaphragm are secured, with no degree of freedom, in a frame, and the securing point is located at one end of the piezoelectric diaphragm when the mid-point is secured, with no degree of freedom, in the frame.
October 23, 2014
Date of Patent:
February 12, 2019
COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES
Abstract: A piezoelectric actuator includes a substrate, a first electrode arranged on the substrate, a piezoelectric body stacked on the first electrode, a second electrode superimposed on a surface of the piezoelectric body on a side opposite to the first electrode, and a wiring connected to the first electrode. The first electrode has a connecting portion which is arranged to protrude from an end portion of the piezoelectric body and to which the wiring is connected, and a first conductive portion is provided so that the first conductive portion overlaps with the first electrode while extending over from an area overlapped with the end portion of the piezoelectric body up to the connecting portion of the first electrode.
Abstract: Disclosed herein are an ultrasonic diagnostic apparatus, and a manufacturing method thereof. The ultrasonic diagnostic apparatus includes: a matching layer; a flexible printed circuit board having steps at both edge portions; a piezoelectric layer disposed below the matching layer and on the flexible printed circuit board such that a first electrode and a second electrode of the piezoelectric layer, between which steps are formed and which are separated from each other by polarization areas, are respectively connected to a first electrode and a second electrode of the flexible printed circuit board; and a backing layer disposed below the piezoelectric layer.
Abstract: A power generating tile assembly includes a tile cover plate that is coupled to a rigid base plate to define an interior region therebetween. The tile cover plate vibrates in response to either sounds waves contacting the tile cover plate or an external force being applied to the tile cover plate. The power generating tile assembly includes a vibrationally-activated power generating device that is coupled to the tile cover plate within the interior region. The vibrationally-activated power generating device generates a first voltage in response to vibrations in the tile cover plate.
Abstract: A surface acoustic wave device includes a piezoelectric substrate, a dielectric film, IDT electrodes, and a resin member. The surface acoustic wave device includes a resin contact region where the piezoelectric substrate and the resin member are in direct contact with each other. The resin contact region has a shape surrounding the IDT electrodes. Because the resin member exhibits a strong adhesion force with respect to the piezoelectric substrate, peeling-off between the piezoelectric substrate and the resin member is significantly reduced or prevented, and an airtight condition is maintained in the interior of the surface acoustic wave device.
Abstract: A piezoelectric drive device includes a vibrating body, a support portion formed integrally with the vibrating body, and a piezoelectric element formed of a first electrode film, a piezoelectric body film, and a second electrode film on at least one surface of the vibrating body.
Abstract: A solidly mounted resonator structure includes an multi-layer acoustic reflector structure and a piezoelectric material layer arranged between the first and second electrode structures to form an active region, with the acoustic reflector structure providing enhanced reflection of shear and longitudinal modes of acoustic vibrations. The solidly mounted resonator structure is configured for transduction of an acoustic wave including a longitudinal component and a shear component. The acoustic reflector structure includes multiple sequentially arranged differential acoustic impedance layer units each including a low acoustic impedance material layer in contact with a high acoustic impedance material layer. A frequency corresponding to a minimum transmissivity of a second harmonic resonance of a longitudinal response is substantially matched to a frequency corresponding to a minimum transmissivity of a third harmonic resonance of a shear response.
Abstract: A piezoelectric ceramic that contains an alkali niobate compound as its main ingredient. The alkali niobate compound has a perovskite crystal structure represented by AmBO3 and contains an alkali metal. There exists Sn in part of site A, and Zr in part of site B. A radial distribution function obtained from a K-edge X-ray absorption spectrum of Sn has a first peak intensity P1 at a first distance from a Sn atom and a second peak intensity P2 at a second distance from the Sn atom. The second distance is greater than the first distance, and the peak intensity ratio P1/P2 is 2.7 or less.
Abstract: There is provided a piezoelectric element which includes a first electrode, a piezoelectric layer which is formed on the first electrode by using a solution method, and is formed from a compound oxide having a perovskite structure in which potassium, sodium, and niobium are provided, and a second electrode which is provided on the piezoelectric layer. A cross-sectional SEM image of the piezoelectric layer is captured at a magnification of 100,000. When evaluation is performed under a condition in which a measured value in a transverse direction is set to 1,273 nm, two or more voids are included in the piezoelectric layer, a difference between the maximum value and the minimum value among diameters of the voids to be largest in a film thickness direction is equal to or smaller than 14 nm, and the maximum value is equal to or smaller than 24 nm.
Abstract: The dimension in a moving direction of a vibration wave motor is shortened without impairing the thrust force, and the size of a driver is reduced. The vibration wave motor includes a vibrating plate having a substantially rectangular outline, a piezoelectric element bonded to the vibrating plate and configured to vibrate, and a protrusion provided to the vibrating plate or the piezoelectric element. The vibrating plate has a section not covered with the piezoelectric element inside a rectangular region encompassing the piezoelectric element within a plane where the piezoelectric element is bonded, and also has a notched portion along a straight line which passes through the section and is parallel to one side of the outline of the vibrating plate.