169 results about "Piezoelectric bimorph" patented technology

A pair of through-holes 41a and 41b having the same shape are formed and aligned in a flexible board 4 on which a wiring pattern 42 is formed. A piezoelectric actuator 3 made of a piezoelectric bi-morph device is inserted into the first through-hole 41a and then into the second through-hole 41b from the opposite surface side. As a result, both the ends in the longitudinal direction of the piezoelectric actuator 3 contact the same surface of the flexible board 4. The flexible board 4 is disposed so that it contacts a touch sensor portion except for a part of the flexible board 4. Thus, a high performance force sense feedback function caused by the panel that deforms corresponding to an input operation can be accomplished at low cost.

The invention relates to a piezoelectric-electromagnetic composite low-frequency broadband energy harvester, and belongs to the technical field of new energy and power generation. The piezoelectric-electromagnetic composite low-frequency broadband energy harvester is characterized in that piezoelectric bimorphs are fixed at the upper surface and the lower surface of a cantilever beam; the surfaces of the piezoelectric bimorphs are coated with silver; one end of the cantilever beam is fixed on a base of a vibration body, and the other end is pasted with a permanent magnet; two sides of the permanent magnet are provided with induction coils respectively; and two side magnets are placed behind the two induction coils respectively. According to the invention, the environment adaptability and the energy harvesting efficiency of the energy harvester are improved; and the energy harvesting bandwidth can be effectively expanded. The piezoelectric-electromagnetic composite low-frequency broadband energy harvester harvests energy under vibration conditions by using a piezoelectric effect and an electromagnetic effect, can generate large current and high voltage, effectively makes up defects of a piezoelectric or electromagnetic independent energy harvesting mode, can achieve simultaneous output of high voltage and high current by using an effective energy conversion circuit, and is more conducive to charging a rechargeable battery or a super-capacitor.

An optical device with a deformable membrane (2) including an anchor area (2.3) on a support (1) entrapping a liquid or gas fluid, a central area (2.1) reversibly deformable from a rest position, actuating means for moving the fluid (4) biasing the membrane (2) into an intermediate area between the anchor area (2.3) and the central area (2.1), the actuating means include a piezoelectric continuous crown accommodating several actuators (5.1), this crown surrounding the central area (2.1), the actuating means (5) being anchored to the membrane (2) in at least the intermediate area (2.2), the actuating means (5) and the membrane (2) to which they are anchored, forming at least one piezoelectric bimorph (B), the actuating means (5) radially contracting or extending upon actuation so as to generate a movement of said fluid (4) from the intermediate area (2.2) to the central area (2.1) of the membrane (2) or vice versa, aiming at deforming the central area (2.1) with respect to its rest position.

A piezoelectric bimorph cantilever is used for determining physical parameters in a gaseous or liquid environment. The sensor works as a driven and damped oscillator. Contrary to common cantilever sensor systems, the piezoelectric film of the bimorph cantilever acts as both a sensor and an actuator. Using at least two resonance mode of the bimorph cantilever, at least two physical parameters can be measured simultaneously in a gas or a liquid. An optimized piezoelectric cantilever and a method to produce the cantilever are also described.

In a angular rate sensor, a weight and a base are connected directly through piezoelectric bimorph detectors and piezoelectric bimorph exciters each having a bent portion. When acceleration is applied to the weight, the weight is displaced so as to deform the piezoelectric bimorph detectors. Due to this deformation, charges generated in the piezoelectric bimorph detectors are detected so as to detect acceleration. If an angular rate is applied to the weight when the weight is vibrated by the piezoelectric bimorph exciters, Coriolis force is generated in the weight so as to deform the piezoelectric bimorph detectors. Due to this deformation, charges generated in the piezoelectric bimorph detectors are detected so as to detect the angular rate.

A flow energy harvesting device having a harvester pipe includes a flow inlet that receives flow from a primary pipe, a flow outlet that returns the flow into the primary pipe, and a flow diverter within the harvester pipe having an inlet section coupled to the flow inlet, a flow constriction section coupled to the inlet section and positioned at a midpoint of the harvester pipe and having a spline shape with a substantially reduced flow opening size at a constriction point along the spline shape, and an outlet section coupled to the constriction section. The harvester pipe may further include a piezoelectric structure extending from the inlet section through the constriction section and point such that the fluid flow past the constriction point results in oscillatory pressure amplitude inducing vibrations in the piezoelectric structure sufficient to cause a direct piezoelectric effect and to generate electrical power for harvesting.

To provide an acceleration sensor and a sensor network system having a construction in which the consumption of power to be consumed can be reduced and the sensor itself can be miniaturized without using any piezoelectric sensor or piezoelectric bimorph.An acceleration sensor device provided with an acceleration sensor which is an electrostatic induction conversion device for conversion between electric energy and kinetic energy, which comprises a conductor and an electret moving relatively to the conductor, said acceleration sensor device having: an acceleration detection unit to detect a signal corresponding to acceleration, from an AC voltage output by the acceleration sensor; a rectification unit to rectify the AC voltage; and a power supply circuit having a battery to power circuits in the device to work, to charge the battery with the rectified voltage as electric energy.

The invention relates to a rotary piezoelectric generation device, which is particularly suitable for collecting variable and random energy in an environment. The device increases the response frequency of a piezoelectric bimorph beam by utilizing a contactless permanent magnetic force, increases the response amplitude of the piezoelectric bimorph beam based on a bistable potential energy principle and improves output power. The device mainly comprises an exciting wheel, a regulating wheel, the piezoelectric bimorph beam and the like. Environmental mechanical energy is transmitted to the exciting wheel by a rotating shaft, the exciting wheel impacts the piezoelectric bimorph beam by utilizing the permanent magnetic force of a permanent magnet, and the response frequency of the piezoelectric bimorph beam is far higher than the frequency of the exciting wheel. The regulating wheel makes the piezoelectric bimorph beam in a bistable potential energy state, and can increase the response amplitude of the bimorph beam. The device provided by the invention has the advantages of simple structure, high energy conversion efficiency and the like, and can be applied to complex irregular natural environments.

The present invention relates to a piezoelectric bimorph switch, specifically a cantilever (single clamped beam) switch, which can be actively opened and closed. Piezoelectric bimorph switch are known from the prior art. Such a switch may be regarded as an actuator. Actuators are regarded as a subdivision of transducers. They are devices, which transform an input signal (mainly an electrical signal) into motion. Electrical motors, pneumatic actuators, hydraulic pistons, relays, comb drive, piezoelectric actuators, thermal bimorphs, Digital Micromirror Devices and electroactive polymers are some examples of such actuators. The switch of the invention comprises piezoelectric stack layers (121, 122), which form a symmetrical stack, wherein an electric field is always applied in the same direction as the poling direction of the piezoelectric layers.

The invention relates to a piezoelectric fiber containing a metal core with part coated with an electrode, which comprises a metal core (1), a piezoelectric material (2) coating the metal core (1) and a coating electrode (3) coating the outer surface of the piezoelectric material (2). The surface of the piezoelectric material (2) comprises an electrode coated part (3) and a non electrode coated part (4); the electrode coated part (3) is a coated electrode (31) which partially covers the surface of the piezoelectric material (2) along the extending direction of the piezoelectric fiber containing a metal core. The piezoelectric fiber containing a metal core with part coated with electrode of the invention can realize the driving functions of driving components such as traditional piezoelectric bimorphs, can be used as micro-drivers and for energy recycling and vibration control, and especially can realize the function of bending vibration, thus overcoming the application disadvantages of the existing piezoelectric fibers.

In a angular rate sensor, a weight and a base are connected directly through piezoelectric bimorph detectors and piezoelectric bimorph exciters each having a bent portion. When acceleration is applied to the weight, the weight is displaced so as to deform the piezoelectric bimorph detectors. Due to this deformation, charges generated in the piezoelectric bimorph detectors are detected so as to detect acceleration. If an angular rate is applied to the weight when the weight is vibrated by the piezoelectric bimorph exciters, Coriolis force is generated in the weight so as to deform the piezoelectric bimorph detectors. Due to this deformation, charges generated in the piezoelectric bimorph detectors are detected so as to detect the angular rate.

In an acoustic vibration generating element, a piezoelectric bimorph element or unimorph element is covered with a covering member of a flexible material at least on two surfaces perpendicular to a thickness direction. The covering member may be provided with a plurality of V-shaped grooves so as to improve a generated vibrating force. Alternatively, the covering member may be provided with an air chamber in the vicinity of a surface of one side so as to prevent sound leakage. Further, the covering member and an earhook may be integrally formed by the flexible material so as to achieve a light-weight acoustic vibration generating element suitable for a bone conduction speaker.

The invention provides a structure and a forming method of a travelling-wave valveless piezoelectric micropump of a multistage diffusion micro-flow pipeline. The structure of the travelling-wave valveless piezoelectric micropump comprises a micropump base, a micro-flow pipeline and a travelling-wave driving array, wherein the micropump base mainly comprises a driving array clamping groove, a micro-flow pipeline bonding area, a sample inlet and a sample outlet; the multistage diffusion micro-flow pipeline is made of a PDMS (Polydimethylsiloxane) material; a corresponding trapezoidal protrusion corresponding to each stage of diffusion structure is formed on the upper surface of the pipeline; the overall dimension of each corresponding trapezoidal protrusion is matched with the inside diameter of a diffusion pipe; the micro-flow pipeline and the micropump base are bonded together to form an integral pump body; the travelling-wave driving array is arranged in parallel by adopting dual piezoelectric bimorphs; one end of each piezoelectric bimorph is arranged on the corresponding trapezoidal protrusion on the surface of the micro-flow pipeline and is tightly contacted with the corresponding trapezoidal protrusion; and the other end of each piezoelectric bimorph is fixedly arranged on the micropump base. According to the travelling-wave valveless piezoelectric micropump disclosed by the invention, the multistage diffusion micro-flow pipeline is combined with the travelling-wave valveless piezoelectric micropump, so that the reverse reflow of the micro-flow pipeline is reduced and the output flow speed of the micropump is increased; and the travelling-wave valveless piezoelectric micropump has the characteristics of simple manufacturing process, small size, convenience and accuracy in flow control and the like and is suitable for manufacturing integrated micro-fluid chips.

The invention discloses a plane parallel three-degree-of-freedom precise operating platform which comprises a base and an objective table arranged on the base; the base is fixedly connected with three supports, and the objective platform is connected with the three supports mutually through three flexible transmission connecting rods; the three flexible transmission connecting rods are distributed around the objective table, and one end of each flexible transmission connecting rod is fixedly connected to the objective table, and the other end of each flexible transmission connecting rod is fixedly connected with the support corresponding to the flexible transmission connecting rod; a resistance strain gauge and a piezoelectric bimorph are pasted on each flexible transmission connecting rod; each two connecting lines of geometric centers of the connecting parts of the supports and the flexible transmission connecting rods form a triangle; each two connecting lines of geometric centers of the connecting parts of the flexible transmission connecting rods and the objective table form another triangle; and the resistance strain gauge and the piezoelectric bimorph are connected with a closed loop feedback control system which enables the objective table to implement plane two-degree-of-freedom shifting motion and rotating motion around the geometric center of the objective table. The plane parallel three-degree-of-freedom precise operating platform provided by the invention has the advantages of simple structure, small mounting space, and high motion accuracy and positioning accuracy.

A transfer apparatus comprises a toner image supporting body and a corona transfer means, which are oppositely disposed, and a vibrating unit for exerting vibration force to the rear face of a toner supporting body, disposed opposite to the corona transfer means, wherein the vibrating unit has a cantilever structure for holding an end of a piezoelectric bimorph element in which a pair of piezoelectric bodies each having an electrode, are bonded to both sides of a conductive elastic member (a shim member). A protrusion portion is provided on the other end of the piezoelectric bimorph element.

The invention discloses a piezoelectric ink jet head and a printing device with the piezoelectric ink jet head, and belongs to the technical field of ink jet printing. The ink jet head comprises a piezoelectric ceramic and a nozzle plate. The piezoelectric ceramic is provided with a plurality of strip-shaped channel walls, a groove is formed between every two adjacent channel walls, metal inner electrodes are embedded in the channel walls to form a piezoelectric bimorph structure, and the outer surfaces of the channel walls are provided with outer electrodes. The nozzle plate covers the far end faces of the channel walls, a flexible sealing substance is arranged between the nozzle plate and the channel walls at intervals, the nozzle plate is provided with nozzles, the number of the nozzles is equal to the number of grooves, and the nozzles correspond to the grooves in position. According to the piezoelectric ink jet head, the channel walls are powered up and deformed in a d31 transverse bending mode, large deformation can be produced, large deformation pressure can be produced on ink in an ink channel, large-grain-size ink can be ejected, and the ejecting speed can be improved.

A travelling wave thermoacoustic piezoelectric apparatus capable of generating electrical energy from heat energy is provided. The travelling wave thermoacoustic piezoelectric apparatus includes a hosing with two ends connected by an inertance component, a porous stack, a resonator, and a piezoelectric bimorph. The housing comprises a compressible fluid and has a first portion and a second portion. The first portion receives heat energy from a heat source for creating a temperature gradient between the first portion and the second portion. A cold heat exchanger within the second portion is positioned at one end of the porous stack. The compressible fluid traverses between the first portion and the second portion through the porous stack and the inertance component to generate travelling acoustic waves. The travelling acoustic waves resonate with the resonator for generating acoustic energy. The piezoelectric bimorph positioned at an end of the resonator opposite to an end of the resonator connected to the second portion, oscillates based on the acoustic energy for generating the electrical energy.

The invention discloses a legged jump robot based on piezoelectric drive and a control method thereof. The robot comprises a flexible body formed by folding four layers of planar PVC film and four piezoelectric bimorph pins, wherein the PVC film layers are connected with bounce legs, stop pieces, shape memory alloy springs and stainless steel springs. By utilizing the vibration of the piezoelectric bimorphs under the effect of sine and cosine voltages, the robot can perform straight-line walking. By utilizing the heating construction performance of shape memory alloy, the PVC layers store andrelease strain energy to achieve folding and unfolding of the bounce legs, the robot can obliquely and upward jump and be repristinated for continuous walking, and mutual switching of motion modes isachieved. The legged jump robot integrates the advantages of quick response of piezoelectric drive, high precision and large deformation of shape memory alloy, linear and jumping motions of the robotare achieved, and the application field and motion range of the piezoelectric robot are widened.

An actuator is disclosed, which includes a piezoelectric bimorph. The actuator also includes a substantially moisture impervious and electrically insulating packaging having a cavity around the bimorph providing for a clearance around the bimorph. The packaging includes a carrier having first and second surfaces and an aperture wherein the bimorph is disposed, the packaging further includes first and second cover films selectively attached to the first and second surfaces respectively, and at least one flex circuit connected to the bimorph for supplying electrical energy thereto.

The invention discloses a self-adaptive wide-band fluid energy harvesting device. The device is characterized in that the device comprises a base, a supporting rod, an energy harvesting mechanism and a rectification storage circuit, wherein the lower end of the supporting rod is movably connected to the base to make the supporting rod rotate along with the wind; one or more energy harvesting mechanisms are arranged, each energy harvesting mechanism comprise a cantilever beam, a piezoelectric bimorph and a light cylinder, one end of each cantilever beam is fixed to the supporting rod, the top of each piezoelectric bimorph is fixed to the other end of the corresponding cantilever beam, and the bottom of each piezoelectric bimorph is fixed to the center of the top of the corresponding light cylinder. The energy harvesting device is simple in structure; since the energy harvesting device interferes with the influence of the cylinders on a flow field, the energy harvesting device can obviously improve the vibration amplitude and frequency locking range of each light cylinder, and accordingly more effective power can be outputted.

The invention discloses a flexible robot based on piezoelectric driving. The flexible robot based on piezoelectric driving is formed by connecting six driving feet to a cross-shaped PVC film, and shape memory alloy springs and shape memory alloy wires are separately arranged on the upper and lower surfaces of the PVC film, wherein the shape memory alloy springs and the shape memory alloy wires arearranged in a crossed mode. By using the vibration of piezoelectric bimorph under the action of sine and cosine voltages, the robot can move forward and turn left and right by exciting different piezoelectric bimorph sets. By using the characteristics that the shape memory alloy springs are heated and shrunk to restore the original length, a corresponding front leg, middle leg or rear leg of therobot is lifted, and meanwhile by using the characteristics that the shape memory alloy wires are heated to restore the original straight line shape, so that the corresponding front leg, middle leg orrear leg of the robot fall down, and the obstacle-crossing function of the robot is realized. The flexible robot based on piezoelectric driving combines the advantages of fast response, accurate positioning and large deformation degree of a shape memory alloy of piezoelectric driving to realize the planar motion and the obstacle-crossing function of the robot.

The invention discloses a blender of a melt extrusion type color 3D (three-dimensional) printing head. The blender comprises a blending support, a heating block arranged in the blending support, heating rods inserted into the heating block, a primary blending chamber fixed to the bottom of the heating block, a secondary blending chamber disposed at the bottom of the primary blending chamber and heat insulation rods inserted into the secondary blending chamber, symmetrical inclined planes are arranged on the blending support, and piezoelectric bimorphs are fixed to the symmetrical inclined planes. The secondary blending chamber comprises two vibration reduction feed pipes, an array blending ring and a discharge opening, the upper ends of the vibration reduction feed pipes are communicated with the bottom of the primary blending chamber, the lower ends of the same are connected with the upper portion of the array blending ring, and the bottom of the array blending ring is connected with the discharge opening. Molten materials of three primary colors can be blended fully so as to blend pure material colors, and printing resolution is unaffected in the blending process.

The invention relates to a piezoelectric-electromagnetic hybrid driving multi-degree-of-freedom precision positioning device and a control method, and belongs to the field of precision machinery and precision engineering. A piezoelectric inertial rotary positioning assembly is fixedly mounted in a connecting sleeve and ensures a clearance fit with an output shaft in the case of power outage. A piezoelectric bimorph rotary positioning assembly is installed in an interference fit with the output shaft. The output shaft is supported and guided by bearings I and II fixedly mounted in the connecting sleeve to ensure that the axis of a connecting assembly at the tail end of the output shaft is coaxial with an output axis. A clamping mechanism is fixedly connected to the flange of a body by a connecting bolt, is in close contact with the connecting sleeve by using a hemispherical contact member to realize self-locking, and is fixed to an external macro-adjustment positioning platform throughthe end portion of the body. The piezoelectric-electromagnetic hybrid driving multi-degree-of-freedom precision positioning device has compact structure, can achieve axial large-stroke linear positioning and macro-micro hybrid rotational positioning, can realize multi-degree-of-freedom motion output, and has good application prospects in the fields of precision optics, micromanipulation, aerospaceand precision instruments.

Tapered elements fabricated from a substrate of a size many times that of a single element are disclosed. Such tapered elements may be used as piezoelectric microactuators such as in-plane piezoelectric bimorph microactuators. A unique method of fabricating such tapered elements is provided. According to the method, cutting directions are first defined, the substrate is then cut a plurality of times in each cutting direction with adjacent cuts in each cutting direction indexed by proper indexing distances which are determined based on the dimensions of the final tapered elements. In one embodiment of the method, a plurality of optically detectable marks are used to define the cutting directions and cutting means is accordingly optically aligned with the cutting directions.

The invention discloses a multi-mode flexible robot and a control method thereof. The robot is formed by connecting four piezoelectric bimorph pieces and two shape memory alloy springs to a PVC flexible base body. The shape memory alloy is used for driving the flexible base body deforms to drive a PVC elastic band to store and release bending strain energy, and the robot achieves the functions ofjumping motions and restoring to the original shape after jumping. Piezoelectric bimorph driving is utilized to enable the robot to achieve the functions of linear motions, turning motions and postureadjustment after jumping. Due to the design of the symmetrical base body structure of the robot, the anti-symmetric piezoelectric bimorph piece arrangement and the self-adaptive side edge elastic band, the robot can realize non-overturning directional continuous movements. By combining the advantages of high precision and quick response of the piezoelectric driving mode and high flexibility and large deformation of the shape memory alloy, the self-adaptive multi-motion mode of linear, turning, jumping and posture adjustment of the robot is realized.

A standing wave thermoacoustic piezoelectric refrigerator is provided. The standing wave thermoacoustic piezoelectric refrigerator includes a housing, a porous stack, and a piezoelectric bimorph. The housing comprises a compressible fluid and has a first portion and a second portion. The porous stack is positioned between a hot heat exchanger and a cold heat exchanger within the housing, at an end of the first portion of the housing opposite to an end of the first portion having the porous stack and is capable of oscillating to generate acoustic energy upon receiving energy from an external energy source. The oscillation of the piezoelectric bimorph compresses and expands the compressible fluid within the housing. Whereby, the compressible fluid traverses between the first portion and the second portion through the porous stack to generate standing acoustic waves enabling the compressible fluid to transfer heat from the cold heat exchanger to the hot heat exchanger.

The invention relates to a deflecting plate jet flow electro-hydraulic servo valve based on a piezoelectric structure. The valve comprises a valve body 1, a sensor 2, a valve pocket 3, a valve element 4, an end cap 5, a jet flow assembly 6, a counter-force rod 7, a connecting rod 8, a piezoelectric bimorph 9, a support structure 10, a bourdon tube 11, an upper shell 12 and an outer cover 13 and is characterized in that the head end of the piezoelectric bimorph 9 is assembled in the middle of the support structure 10 through a press fit connection manner, and the tail end of the piezoelectric bimorph 9 is connected with the connecting rod 8 through a press fit connection manner; the connecting rod 8 is connected with the bourdon tube 11 and the counter-force rod 7 through a press fit manner; the support structure 10 and the bourdon tube 11 are mounted on the upper shell 12 through screws; the jet flow assembly 6 is mounted in the upper shell 12; the jet flow assembly 6 and a narrow groove in the counter-force rod 7 form a jet flow structure; the end face of the valve body 1 is connected with the sensor 2; the valve pocket 3 and the valve element 4 are mounted in the valve body 1; the upper shell 12 is mounted on the valve body 1 through threaded connection; and the counter-force rod 7 goes deep into the valve body 1 through a circular hole and is connected with the valve element 4.

The invention relates to a method for preparing a piezoelectric bimorph. Non-solidified epoxy resin contained by a fiberboard prepreg is enabled to be melted, scattered and solidified under the action of high-temperature directional pressure, thereby realizing bonding between an intermediate supporting piece and a piezoelectric body. Solidification and moulding are carried out while the piezoelectric body and the intermediate supporting piece are realized. The acquired piezoelectric bimorph has the characteristics of reliable operation and long service life.

The invention relates to a sensor, in particular to a novel ultrasonic wave sensor which comprises a hollow metal outer case. One end of the metal outer case is covered by a matching layer in a sealing mode. The inner side of the matching layer is provided with piezoelectric bimorphs in parallel in a pasted mode. The piezoelectric bimorphs in parallel are formed in the mode that the two opposite electrode faces of the two piezoelectric bimorphs are respectively pasted on two faces of a metal substrate, the other two electrode faces of the two piezoelectric bimorphs are electrically connected, and a common connecting end of the two piezoelectric bimorphs and the metal substrate are respectively connected with a connecting terminal. The novel ultrasonic wave sensor is simple in structure, high in sensitivity, and small in aftershock.