62results about "Piezoelectric/electrostriction/magnetostriction machines" patented technology

A suspended-load backpack designed to permit the load to move relative to the backpack frame during walking and running so that the large movements between the load and the frame of the backpack reduce the fluctuations of absolute vertical motion of the load. Because the hip (and thus the pack frame) go up a down a good deal during walking, a large relative movement between the frame and the load reduces the absolute excursion of the load. This movement may be, in turn, transferred to a motor through, for example, a rack and pinion gear, to convert the mechanical movement to electrical energy. The movement may also be converted to electrical energy by using an electroactive polymer (EAP) to connect the suspended load to the frame. Such designs allow the load to move in a controlled fashion to prevent the patient from losing his or her balance as the load moves up and down along the backpack frame. Such movement of the suspended-load relative to the frame also reduces the forces on the wearer's shoulders while walking or running, thus reducing the likelihood of orthopedic injury.

A piezoelectric substrate and interdigital electrode portions are covered with an insulating layer with an insulating thin film interposed therebetween. The piezoelectric substrate is made of LiTaO₃ and the insulating thin film and the insulating layer are made of silicon oxide. By intentionally making the upper surface of the insulating layer flat, the deterioration of propagation efficiency of surface acoustic waves can be suppressed, so that it is possible to reduce increase in insertion loss of a resonator. Since the upper surface of the insulating layer is flat, it is also possible to reduce variation in resonant frequency and anti-resonant frequency due to the temperature change of the surface acoustic wave device.

A piezoelectric device includes a base substrate constituting the bottom of the package; a framed resonator element layered on the base substrate; and a lid for hermetically sealing a space within the package, the lid being layered on the framed resonator element. The framed resonator element includes a frame constituting a wall surrounding the space within the package; a base having a predetermined width, which is integrally formed inside the frame; a plurality of resonating arms that extend in parallel to each other from the base in one direction in the frame; first cutouts that are provided near the base ends of the resonating arms in the base; and second cutouts formed at the joint between the base and the frame.

A piezoelectric device connected to a vibration source converts vibration energy to electrical current. A plurality of pairs of oppositely polarized piezoelectric wafers deflect to produce an electrical current. Each pair of wafers are arranged back-to-back and electrically joined together. The plurality of pairs of wafers are each connected to a set of micro-machined parts. Each pair of wafers form a bimorph, configured as a cantilevered beam attached to a set of parts to form an element. Each cantilevered beam has a mass weighted first end and is fixedly attached to one or more flexible sheaths on a second end. A plurality of elements form a cell unit. A plurality of cell units form an array. The electrical current produced varies by the number of elements per cell unit, and/or with the number of cell units per array.

A micro-electromechanical dimensioned bimorph structure includes a first element layer structure, and a second element layer structure. The element layer structures are provided in various combinations, including piezoelectric/piezoelectric, antiferroelectric/antiferroelectric or antiferroelectric/piezoelectric. The layer thickness of the element structure is less than 100 μm. A bonding layer bonds the first element structure directly to the second element structure and the bonding layer thickness is less than 10 μm. The bimorph structure can be made in various forms including a cantilever or a diaphragm. Microfluidic devices using the bimorph structures may also be constructed.

The invention discloses a piezoelectric power generation device. The piezoelectric power generation device comprises an outer frame, a main cantilever beam, a mass-adjustable main mass block, two second-level cantilever beams and two mass-adjustable second-level mass blocks; the main cantilever beam, the main mass block, the two second-level cantilever beams and the two mass-adjustable second-level mass blocks are respectively located at the inner side of the outer frame; one end of the main cantilever beam is connected with the outer frame; the other end of the main cantilever beam is connected with the main mass block; the main mass block is connected with one end of each of the second-level cantilever beams; the other end of each of the second-level cantilever beams is connected with one second-level mass block; and the main cantilever beam and the second-level cantilever beams are respectively a metal frame of which the upper surface and the lower surface are both provided with a piezoelectric unit. According to the piezoelectric power generation device of the invention, one main cantilever beam and two second-level cantilever beams are adopted to form a three-degrees-of-freedom piezoelectric beam structure, so that the work bandwidth of the piezoelectric generator can be broadened through the plurality of cantilever beams with different resonant frequencies; and the mass of the main mass block and the second-level mass blocks can be decreased or increased according to actual situations, and therefore, resonant frequencies can be adjusted flexibly. Thus, the piezoelectric power generation device of the invention can be applied to environments with different resonant frequencies.

A lens module includes a lens, a barrel, a holder and a driving mechanism. The barrel is configured for receiving the lens. The holder is configured for receiving the barrel therein. The driving mechanism includes a first lever and a first piezoelectric device. The first lever includes a fixed end and a moving end and a connecting portion interconnected between the fixed end and the moving end. The fixed end of the first lever is pivotedly mounted in the holder. The moving end of the first lever is configured for driving the barrel to move. The first piezoelectric device is arranged between the connecting portion and the holder. The first piezoelectric device is extendable and contractible along an optical axis of the lens so as to control movement of the barrel along the optical axis relative to the holder.

The invention relates to an automotive active engine mount capable of energy regeneration and transmitting force perception. The automotive active engine mount consists of an active engine mount actuator body and a control circuit system, wherein the active engine mount actuator body mainly consists of rubber springs, a base, a position-fixing pin, a metal framework, an electromagnetic linear module and a piezoelectric module; the upper end and the lower end of the active engine mount actuator body are respectively connected with an engine body and an automobile frame through connecting bolts;and an actuator control system mainly consists of an energy recovery module, a controller, a storage battery voltage sensor, a controllable current source, a rotating speed sensor, a force sensor, anactuator energy regeneration voltage sensor and a relay. The invention also relates to a control method of the automotive active engine mount. The automotive active engine mount is novel in structureand high in practicability and is capable of significantly reducing the impact of engine vibration on a chassis and the automobile body, improving the ride comfort of an automobile, reducing the noise in the automobile, recovering the energy of the engine vibration, reducing the energy consumption of the automobile and achieving the purpose of improving the performance of the entire automobile while reducing the energy consumption.

The invention describes a vibrating element apparatus, preferably in the form of a tuning fork-type contact level transducer, and a method of forming the same. The tines of the transducer are vibrated by piezoelectric elements, which piezoelectric elements are arranged in a stack along with insulators and conductors to allow cyclic electrical signals to be applied thereto. The stack is provided as a sub-assembly allowing ready replacement in the field and 10 without disturbing the installation of the transducer in the plant which it serves.

A shaft sealing device with a simple internal structure switches a sealing state and an unsealing state of a fluid, with high sealing performance maintained, because of no abrasion accompanying the movement of a sealing material or a sealing member, thereby enabling feeding a fluid at a predetermined flow rate, and adjusts the expanding rate of the sealing material with the quantity of an external electric signal and accordingly adjusts the contact face pressure to enable controlling the amount of leakage of the fluid highly precisely, so that it can be used for all applications. The shaft sealing device includes a shaft sealing body formed of a macromolecular material and made expansible or contractible, or deformable, through external electrostimuli applied to a shaft sealing portion disposed in a device body, and flow passages disposed in the shaft sealing portion for feeding the fluid leaked due to the expansion or contraction, or the deformation, of the shaft sealing body.

One aspect of the present invention relates to a driver of a vibrator including: a control section; and an alternating current signal generation section configured to generate an alternating current signal based on an output from the control section, and to apply the alternating current signal to the vibrator, wherein the control section is configured to lower a frequency of the alternating current signal, and to change, after the frequency change, at least one of a voltage ratio and a phase difference of the alternating current signal such that the ellipse ratio of the elliptical motion changes from a first ellipse ratio to a second ellipse ratio, the second ellipse ratio has a larger ratio of a component in a moving direction in the elliptical motion to a component in a direction perpendicular to the moving direction in the elliptical motion than the first ellipse ratio.

With actuators according to prior art, it is known that, in the inactive region, which is required for contact purposes, irregularities in expansion occur. These produce cracks in the piezoelectrically inactive electrode region, which may occur at regular intervals. As a result of the irregularities in expansion, the stresses accumulate in the passively expanded regions, up to a level at which they are relieved by crack formation.

It is therefore proposed according to the invention that the contact surfaces (17), and therefore the inactive regions (15) assigned to them, of one or a predetermined number of electrodes of the same polarity (11; 30 to 37; 39, 40), arranged above one another in the same direction, are arranged offset to one another by a predetermined angle (22) of the size α, opposite the contact surfaces (17), and therefore the inactive regions (15) assigned to them, of the preceding internal electrode or a predetermined number of preceding electrodes of the same alignment and the same polarity.

A piezoelectric element has a first electrode containing platinum, a piezoelectric layer formed above the first electrode, and a second electrode formed on the piezoelectric layer. The piezoelectric layer is composed of an oxide containing potassium, sodium, niobium, bismuth, and iron.

A method of fabricating a case accommodating a piezoelectric vibrating piece therein in a piezoelectric oscillator including the piezoelectric vibrating piece, including the steps of: applying deep drawing to a conductive plate member to shape the plate member in a nearly cylindrical shape with a bottom; pressing an inner surface of a bottom part of the plate member by a punch for step drawing while an outer surface of the bottom part is being abutted against a surface including an opening of a hole of a die having an inner diameter smaller than the outer diameter of the bottom part, whereby a projecting portion is formed on the outer surface of the bottom part; and cutting the plate member having the projecting portion at a predetermined position on the opening side thereof, whereby a case in a nearly cylindrical shape with a bottom having the projecting portion is obtained.

The invention discloses an optical chip and inertial sensor integrated device and a manufacture method thereof. The optical areas of optical chips face a PCB; the pins of the optical chips are welded on the welding disc of the PCB by plating solder balls; an optical window corresponding to the optical chip is also formed in the PCB. The integrated device also comprises a transmitting part covering the optical window, wherein an inertial sensor chip is fixedly arranged on one side, far from the PCB, of each optical chip; the outer sides of the optical chips and the inertial sensor chip are provided with a non-transmitting plastic package body; the non-transmitting plastic package body can be used for achieving plastic package of the optical chips and the inertial sensor chip together on the PCB. According to the integrated device disclosed by the invention, the inertial sensor chip and the optical chips, which are both different in structure and principle, can be integrated in a same package structure, so that the package size of the whole integrated device is greatly reduced.

The invention belongs to the field of positioning navigation time (PNT), and particularly relates to an integrated micro PNT unit comprising a central micro clock module and an outer micro inertia module, wherein an anchor point of the central micro clock module is located at the center, a plurality of circles are distributed outside the anchor point, radial short beams are uniformly distributed between the circles, and outer electrodes are distributed at the outermost periphery. During operation, stable control is realized by electrostatic force action and closed-loop feedback, and stable frequency information is provided externally; the annular anchor point of the micro inertia module is located at the center, the circles are located on the outer side, the composite beams are evenly distributed between the circles and the annular anchor point, the inner and outer sides of the circles are evenly distributed with plane outer electrodes and plane inner electrodes, and the upper and lower surfaces of the circles are distributed with off-plane electrodes, thereby realizing the sensitivity of X, Y, Z three-axis acceleration input and X, Y, Z three-axis angular motion input. The integrated micro PNT unit can be realized by the MEMS planar process as a whole without involving multi-layer stacking and precision assembly on a microscopic level, and the process is relatively simple.

The invention discloses a construction method for a quasi-independent modal actuator. The method includes three steps. First, m piezoelectric strain-rate sensors are stuck on a plate, all outputs usi are summed after passing through all gains gsi to form a combined piezoelectric strain-rate sensor which subsequently excites a combined piezoelectric actuator composed of n gains gaj; second, regions Omega aj of n piezoelectric actuating sheets and the corresponding gaj are selected to lead the combined piezoelectric actuator to become the L-th order modal actuator of the plate; third, a target function is established, and the number n of the piezoelectric actuators, corresponding n-dimensional regional vectors Omega a and gain vectors ga are selected to lead Ja to be close enough to zero; and Ja trends towards zero when n trends towards infinity and the size of a piezoelectric sheet trends towards infinitesimal in the whole structure. The invention has high practical value and wide application prospect in the field of actively controlling structural vibration.

The invention discloses electronic equipment, comprising a shell, an installing substrate, a driving mechanism and a driven device, wherein the shell has an inner cavity and an opening communicating with the inner cavity, both the installing substrate and the driving mechanism are arranged in the inner cavity, the installing substrate is provided with an installing space, the driving mechanism comprises at least two field deformation structural parts which are arranged in the installing space, the adjacent two field deformation structural parts are distributed at intervals and have opposite energizing currents, the driven device is connected with the field deformation structural parts, when the field deformation structural parts are in an energized state, each field deformation structuralpart drives the driven device to extend out of the shell or retract into the shell through the opening by deformation. The electronic equipment of the invention can solve the problem that a driving mechanism of conventional electronic equipment has a complex structure.

The present invention relates to a piezoelectric windwill and belongs to the field of piezoelectric power generation. An end cover is arranged on a shell. The end cover and the shell are provided with buffer reeds. Piezoelectric vibrators and excitation reeds are arranged on the annular boss of the shell. The substrates of the piezoelectric vibrators are arranged closer to the excitation reeds. The free ends of the piezoelectric vibrators are provided with top blocks. The top blocks abut against the excitation reeds. The free ends of the excitation reeds are provided with mass blocks and excited magnets. The two ends of a rotating shaft are respectively arranged on the end cover and the shell through a bearing. The two cross sections of the rotating shaft are uniformly provided with excitation magnets. The opposite magnetic poles of excitation magnets and excited magnets are oppositely arranged. The right end of the rotating shaft extends out of the bottom wall of the shell. A blade is arranged at the right end of the rotating shaft. Before the installation of the piezoelectric vibrators, the piezoelectric vibrators are of a flat and straight structure. After the installation of the piezoelectric vibrators, the piezoelectric vibrators are of a bent structure. During the non-working stage, the maximum compressive stress on a piezoelectric plate is 50% of the allowable value thereof. According to the invention, the system is wide in fundamental frequency adjustable range, and strong in wind speed adaptability. Meanwhile, the piezoelectric plate only bears the compressive stress, so that the reliability is high.