92 results about "Piezoelectric actuators" patented technology

A mirror device includes a mirror portion, a pair of first support portions, a pair of movable frames, a pair of second support portions, a drive portion having a plurality of piezoelectric actuators, a fixed frame, a pair of connecting portions connecting the drive portion and the fixed frame, and a piezoelectric sensor that generates a signal corresponding to swing of the mirror portion around the first axis or the second axis. The piezoelectric sensor is electrically isolated from the plurality of piezoelectric actuators. The plurality of piezoelectric actuators and the piezoelectric sensor are each formed of an upper electrode, a piezoelectric film, and a lower electrode. The upper electrodes of the plurality of piezoelectric actuators are connected in common via a first metal wire. The lower electrode of the piezoelectric sensor is connected to a second metal wire that is electrically isolated from the first metal wire.

A piezoelectric actuator includes a piezoelectric element, and a vibrating plate that vibrates through driving of the piezoelectric element. The vibrating plate includes a first layer containing zirconium oxide as a main constituent material. When zirconium oxide contained in the first layer is measured by X-ray diffraction, and when an intensity related to a cubic crystal (111) is defined as a first intensity and an intensity related to a monoclinic crystal (111) is defined as a second intensity, the ratio of the first intensity to the sum of the first intensity and the second intensity is 40% or more.

An electronic device includes a first button, a second button, at least one processor, comprising processing circuitry, a pressure sensor configured to provide a first signal to the at least one processor, a piezo actuator configured to output a vibration via the first button, and memory storing instructions. The instructions, when executed by at least one processor individually or collectively, cause the electronic device to: based on receiving a second signal from the piezo actuator, while the first signal is not provided to the at least one processor from the pressure sensor, detect a malfunction associated with the first button, and based on the malfunction associated with the first button, in response to the second signal and a third signal indicating a pressure on the second button being maintained during reference time, execute a function allocated to a combination of the pressure on the first button and a pressure on the second button.

This piezoelectric element comprises a columnar laminate and two conductor layers. In the columnar laminate, internal electrodes and a piezoelectric body having potassium sodium niobate as the main component are alternately laminated. The two conductor layers are positioned on the respective lateral surfaces of the laminate and are connected to the corresponding internal electrodes. The piezoelectric body has a first portion and a second portion. The first portion overlaps the internal electrodes in a planar perspective view in the lamination direction. The second portion is located outside the first portion and does not overlap the internal electrodes in the planar perspective view. The concentration of at least one of potassium and sodium contained in the piezoelectric body is constant in the first portion, decreases stepwise at the interface between the second portion and the first portion, and decreases gradually from the interface to the surface in the second portion.

The disclosure relates to a camera module for a vehicle comprising: a housing having a first end and a second end opposite to the first end; at least one camera disposed proximate to or on the first end of the housing; at least one cover glass disposed proximate to or on the second end of the housing facing the at least one camera; at least one actuator, preferably being a piezo actuator, disposed between the housing and the at least one cover glass; and at least one sealing element disposed between the at least one cover glass and the housing, wherein the at least one cover glass is configured to compressibly touch the at least one sealing element, and wherein the at least one sealing element is injection molded onto the housing by a 2K injection molding process.

The invention relates to an electrical switch suitable for having a closed configuration and an open configuration, the electrical switch comprising a first contact (2), a second contact (3), a first actuation assembly carrying the first contact (2) and comprising a first piezoelectric actuator (4), a second actuation assembly carrying the second contact (3) and comprising a second piezoelectric actuator (5), each of the first piezoelectric actuator (4) and the second piezoelectric actuator (5) deforming between a retracted state and an elongated state, in particular under the effect of a change in electric field, in a deformation direction (D) substantially collinear with a longitudinal axis (X1, X2) of the piezoelectric actuator (4, 5).

The present disclosure generally relates to a tape drive comprising a tape head assembly. The tape head assembly comprises a head block having a first end and a second end, the second end being opposite the first end, one or more tape head modules disposed on the head block, the one or more tape head modules each comprising a plurality of data elements, a first spring disposed at the first end of the head block, a piezoelectric element disposed in contact with the second end of the head block, a counterweight disposed adjacent to the second end of the head block, and a second spring disposed adjacent to the second end of the head block. The counterweight has a first weight. The head block and the one or more tape head modules have a collective second weight. The first weight is equal to or greater than the second weight.

The application discloses a kind of microscale high-precision compression-shear integrated mechanical loading device and method based on piezoelectric actuator.The device includes integrated strain gauge system piezoelectric actuator, high-precision mechanical sensor, X / Y / Z three-way piezoelectric displacement table and test table.Piezoelectric actuator and Y direction displacement table are fixed on the vertical two ends of test table, Z direction displacement table is placed on Y direction table, X direction displacement table is connected with Z direction table through steering mounting base A, and high-precision mechanical sensor is fixed on X direction table through steering mounting base B.The application realizes closed-loop control of piezoelectric actuator displacement through strain gauge system, effectively compensates hysteresis and creep error;combined with high-precision force sensor, force and displacement signals are synchronously collected;three-way displacement table is used to accurately center and switch compression, shear and other loading modes.The device is compatible with scanning electron microscope, can be in-situ observed, and is suitable for high-precision mechanical property testing of microscale materials.

The application discloses a piezoelectric motor, which comprises a base, a movable assembly, a piezoelectric actuator group, a shell, balls and elastic supports, the movable assembly is movably connected above the base, the piezoelectric actuator group abuts on the movable assembly, the shell is fixedly connected on the base, a containing space is arranged in the shell, the movable assembly is arranged in the shell, the balls are arranged between the shell and the movable assembly, the balls are also arranged between the base and the movable assembly, the elastic supports provide potential energy for the balls arranged between the shell and the movable assembly to the direction of the base, thereby the relative position between the movable assembly and the base can be limited, and the reliability of the piezoelectric motor is increased.

This invention relates to a symmetrical discrete stacked piezoelectric drive structure, a beam splitter chip, and a fabrication method. The scheme comprises an upper piezoelectric actuator formed by sequentially distributing an insulating layer, a first upper electrode, an upper piezoelectric film, and a first lower electrode on the upper surface of a substrate. The first upper and first lower electrodes provide driving voltages for the upper piezoelectric actuator. A lower piezoelectric actuator is formed by sequentially distributing an insulating layer, a second lower electrode, a lower piezoelectric film, and a second upper electrode on the lower surface of the substrate. The potentials of the first and second upper electrodes are kept consistent, as are the potentials of the first and second lower electrodes. The upper and lower piezoelectric actuators are mirror-symmetrically distributed about the substrate. This overall structure reduces the impact of residual stress on device performance, and the upper and lower piezoelectric actuators can achieve motion coupling, increasing driving displacement and driving frequency.

A piezoelectric motor is disclosed, comprising a fixed component, a movable component, a piezoelectric actuator, an elastic support, and a circuit board. The movable component is movably connected to the fixed component, and the piezoelectric actuator abuts against the movable component. The piezoelectric actuator includes a piezoelectric vibrator and a piezoelectric friction head, the piezoelectric friction head being disposed on the side of the piezoelectric vibrator near the movable component. The elastic support provides potential energy perpendicular to the direction of movement of the piezoelectric actuator and also provides potential energy along the height direction of the movable component. The circuit board is connected to the surface of the piezoelectric vibrator opposite to where the piezoelectric friction head is disposed, and the elastic support is partially disposed on the side of the circuit board away from the piezoelectric vibrator, thereby maintaining the planarity of the piezoelectric motor's movement.

The present application relates to boiler soot blowing steam waste heat recovery technical field, especially to a kind of boiler soot blowing steam waste heat recovery system, including equipment device and communication connection control device;Equipment device contains warm pipe exhaust steam drainage pipe, pulse energy-absorbing premixing component, desuperheating water supply branch pipe, low-pressure bypass exhaust steam main pipe, pressure sensing component, acoustic emission monitoring component and piezoelectric actuator component.Warm pipe exhaust steam enters pressure relief diffusion into variable cross-section cyclone shear phase change cavity after entering expansion buffer chamber, impact the cyclone water film formed by desuperheating water and separate into atomized droplet group, absorb heat and phase change into homogeneous phase steam-water mixture.Control device calculates shear kinetic energy threshold according to the analog voltage signal output by sensing component, drives piezoelectric actuator component to adjust the angle of attack and pitch of flexible guide vane array, realizes dynamic closed-loop adaptation to thermodynamic boundary conditions.

The utility model relates to the technical field of tactile feedback, especially touch feedback excitation device and electronic equipment, include: piezoelectric actuator, piezoelectric actuator includes multilayer piezoelectric layer, metal cymbal piece, center protrudes from the edge setting, the edge is attached to the edge department of piezoelectric actuator, substrate, is attached to the one side of piezoelectric actuator away from metal cymbal piece, wherein, piezoelectric actuator element is configured as the contraction towards center when the voltage is applied, so that the center of metal cymbal piece moves towards the direction away from piezoelectric actuator, piezoelectric actuator and substrate together bend deformation towards the direction away from metal cymbal piece, the utility model discloses through the attachment of piezoelectric actuator and substrate, and reduce the layer number of piezoelectric actuator, with the reverse bending deformation of piezoelectric actuator and substrate, so that the amplitude of touch feedback excitation device and the vibration effect of double cymbal piece are close, and further reduce the cost of touch feedback excitation device.

The embodiments of this disclosure relate to electroacoustic actuators with improved sound pressure level performance. One microelectromechanical electroacoustic actuator includes: a support frame comprising a semiconductor material; a membrane made of the semiconductor material peripherally connected to the support frame; a peripheral piezoelectric actuator on a peripheral portion of the membrane; and a central piezoelectric actuator on a central portion of the membrane. The electroacoustic actuator further includes: an elastic element defined by a corresponding portion of the membrane, wherein the central portion is connected to the peripheral portion of the membrane via the elastic element; and a metal wire extending from the peripheral piezoelectric actuator to the central piezoelectric actuator on the peripheral portion of the membrane, on the corresponding elastic element, and on the central portion of the membrane.

The invention relates to a hybrid circuit breaker comprising: a current path (801) comprising a mechanical switch (805) suitable for having a closed configuration and an open configuration, and a switching path (802) arranged in parallel with the main current path (801) and comprising a semiconductor static switch (806), and wherein the mechanical switch (801) comprises a first contact (2), a second contact (3), a first actuation assembly carrying the first contact (2) and comprising a first piezoelectric actuator (4), a second actuation assembly carrying the second contact (3) and comprising a second piezoelectric actuator (5), each of the first piezoelectric actuator (4) and the second piezoelectric actuator (5) being configured to deform between a retracted state and an elongated state, in particular under the effect of a change in electric field, in a deformation direction (D) substantially collinear with a longitudinal axis (X1, X2) of the piezoelectric actuator (4, 5).

The application discloses a displacement detection circuit and piezoelectric circuit of a piezoelectric actuator. The piezoelectric actuator is used to generate haptic feedback according to a received haptic voltage signal under external force application. The displacement detection circuit comprises a charge storage element for detecting a first charge generated by the piezoelectric actuator due to deformation; a compensation circuit for performing multiple charging operations or discharging operations on the charge storage element to provide a second charge opposite to the first charge to the charge storage element; a counting circuit for counting the number of charging operations or discharging operations of the compensation circuit to obtain a counting value; and a logic output circuit for calculating the total amount of the second charge provided by the compensation circuit according to the counting value, and obtaining the real-time displacement amount of the piezoelectric actuator according to the total amount of the charge, so that the displacement amount of the piezoelectric element in the haptic feedback process can be detected without setting a sensor, and the circuit is simplified, the cost is reduced, the product performance is improved, and the power consumption is reduced.

This invention relates to a retractable arm and control method for a multi-rotor unmanned aerial vehicle (UAV), belonging to the field of UAV technology. It includes a fixed arm, a movable arm, a telescopic drive mechanism, a length monitoring device, a vibration sensor, and a piezoelectric actuator. The fixed arm has an external guide groove; the movable arm is fitted over the fixed arm, with an inner wall slider engaging the guide groove, allowing non-axial loads to be transmitted to the fuselage via the slider and guide groove, achieving separation of drive and load-bearing. The telescopic drive mechanism uses a self-locking screw-nut transmission mechanism, allowing for stepless continuous adjustment and self-locking upon power failure. A length monitoring device provides feedback on the arm length to the flight controller, forming a closed-loop control of the arm length configuration. The vibration sensor monitors fuselage vibration, and the flight controller controls fuselage vibration through primary vibration suppression of the rotor and piezoelectric actuator, and secondary vibration suppression through fine-tuning of the movable arm length. This invention solves the problems of easy wear, inability to achieve stepless continuous adjustment, and lack of active vibration damping in existing telescopic arm drive mechanisms, improving flight stability and reliability.

This invention discloses an ultra-high frequency control system and method for piezoelectric stack actuators. The system includes a LabVIEW-based high sampling rate drive control system and a charge amplifier. The LabVIEW-based high sampling rate drive control system generates drive signals for the piezoelectric stack actuator, acquires displacement signals of the piezoelectric stack actuator, and processes the acquired displacement signals and drive signals to obtain control signals for the piezoelectric stack actuator. The control signals are output to the charge amplifier, which receives and amplifies the control signals. The amplified control signals are then sent to the piezoelectric stack actuator. This invention achieves high-precision trajectory tracking of the piezoelectric actuator at high operating frequencies, with tracking errors reaching the tens of nanometers level under high-frequency operating conditions.

A homogeneous laser illumination system for microscopy applications, based on the use of multimode optical fibers (MMF), is described. The system's operating principle relies on the superposition of dynamic speckle patterns generated from several multimode fibers. These patterns are created by applying random, high-frequency perturbations (tens of kilohertz) induced by a piezoelectric actuator that perturbs the optical fibers. The superposition of these patterns reduces illumination contrast, achieving a uniform light distribution across the field of view (FOV). The system's modularity and adaptability allow for its integration into existing microscopy setups. Furthermore, it can be configured to operate with standard commercial objective lenses, including immersion lenses, and adjusted to reduce photobleaching in fluorescent samples.The system uses multimode optical fibers and requires no additional infrastructure to manage vibrations or mechanical noise. It is suitable for fluorescence microscopy and has been successfully tested with wavelengths across the visible spectrum. The system enhances the illuminated area and optimizes the generation of homogeneous light patterns, providing a high-performance and efficient solution for obtaining high-quality images in microscopic studies.

This application provides a control method for a stick-slip piezoelectric actuator throughout its entire lifecycle, comprising: obtaining a contact force reference value using the equation of the driving characteristic surface; acquiring contact force data from a database; calculating a contact force compensation value and converting it into a compensation voltage for the vertical piezoelectric stack; acquiring step displacement and actual contact force data; obtaining the total wear volume using the Archard adhesive wear model based on the step displacement and voltage data of the vertical piezoelectric stack; proportionally allocating the total wear volume to the slider and driving foot using a wear distribution method based on material hardness; storing the obtained slider wear data, driving foot wear data, and actual contact force data in a contact force database; and predicting contact force data for non-cyclic working ranges based on slider wear data and driving foot wear data within the cyclic working range, and storing this prediction in the database. This method can effectively improve the driving stability of the stick-slip piezoelectric actuator throughout its entire working stroke and lifecycle.

A toolbar with a longitudinal axis and a machining tool for machining a workpiece, the toolbar comprising at least one accelerometer configured to generate an electric signal proportional to the velocity of the toolbar along a direction; at least one piezoelectric actuator; and a control logic unit, operatively connected to the at least one accelerometer and to the at least one piezoelectric actuator, wherein control logic unit is configured to drive the at least one piezoelectric actuator by a driving signal proportional to the velocity derived from at least one accelerometer adapted to compensate the torque and the vibrations on the toolbar.

The application belongs to the technical field of batteries, and in particular relates to a high-safety long-endurance solid-state lithium battery system for a low-altitude flying robot, which comprises a solid-state cell array, an interface self-adaptive regulation and control module, a distributed coupling management module, a multi-source state sensing network, an edge intelligent control unit and a communication and power interface module; the interface contact is maintained in cooperation with an elastic support grid through a piezoelectric actuator, thermal homogenization is realized by combining a phase change material with a micro-channel liquid cooling, and power is dynamically scheduled and fault cells are isolated based on multi-source sensing fusion. The piezoelectric actuator and the elastic support grid are cooperated to maintain the physical contact integrity of the solid-state electrode / electrolyte interface under the dynamic working condition of the aircraft, so that the interface impedance is prevented from suddenly increasing due to the expansion of micro-cracks.

The application belongs to the field of piezoelectric driver nonlinear modeling, and particularly discloses a piezoelectric driver creep nonlinear dynamics model and a construction method and system thereof. c (s)=s ‑μ ; wherein s is a Laplace operator; the identification method of the parameter mu includes: constructing input voltage signals with different frequencies omega i , calculating input voltage signal amplitudes U i ; according to the input voltage signals, obtaining output displacement signals of the piezoelectric driver, and simultaneously calculating output displacement signal amplitudes D i ; calculating the amplitude ratio A i of D i and U i ; obtaining a discrete data point set (x i , y i ) which satisfies: according to the linear fitting of the discrete data point set (x i , y i ), determining the slope of the fitted straight line, and determining the parameter mu according to the slope. The model constructed based on the fractional order involves fewer unknown parameters, is easy to identify, and at the same time, the modeling method is not limited by special discrete points in the time / frequency domain, and has higher universality.

A reconfigurable smart surface is disclosed. The reconfigurable smart surface includes a movable metallic ground plane and a piezoelectric actuator connected to the movable metallic ground plane. Applying a voltage to the piezoelectric actuator causes the piezoelectric actuator to move the movable metallic ground plane, resulting in a change in the thickness of a cavity formed in the reconfigurable smart surface. This allows the signal to be reflected to be modulated in a continuous manner by changing the thickness of the cavity. The reconfigurable smart surface can be a panel comprising multiple units arranged to reflect and modulate the incident signal.

A camera module may include a piezoelectric actuator configured to move a lens or image sensor in a direction substantially orthogonal to an optical axis. The piezoelectric actuator may include: a vibrator configured to generate vibration; a moving body configured to move in a direction substantially orthogonal to the optical axis; and a contact configured to press an elastically deformable region of the moving body and transmit vibrations generated from the vibrator to the elastically deformable region.