75 results about "Piezoelectric voltage" patented technology

According to embodiments of the present invention, a transducer is provided. The transducer includes a first electrode, a second electrode disposed over the first electrode such that the first electrode and the second electrode form respective capacitive electrodes of a capacitor, the second electrode comprising a core portion and a peripheral portion, a third electrode disposed relative to the second electrode such that the third electrode overlaps with the peripheral portion of the second electrode, and a piezoelectric element disposed between the peripheral portion of the second electrode and the third electrode, so as to tune a tensional force provided by the piezoelectric element onto the second electrode by varying a piezoelectric voltage applied between the second electrode and the third electrode.

A blade-type composite pneumatic energy collector comprises a piezoelectric type energy collecting module and a friction type energy collecting module. The piezoelectric type energy collecting module comprises blades and a flexible piezoelectric cantilever. The blades are in parallel connection with the free end of the flexible piezoelectric cantilever. The blades can drive the flexible piezoelectric cantilever to vibrate periodically in a frame. The friction type energy collecting module comprises a moving friction layer pasted on the surface of the flexible piezoelectric cantilever and a fixed friction layer pasted on the surface of the frame. The moving friction layer and the fixed friction layer can relatively contact and separate periodically in the frame. The collector adopts two energy collecting modes: the friction type and the piezoelectric type, and the energy output density is increased. The blades at the tail end of the cantilever can response better to the disturbance of the wind flow, and the amplitude of the piezoelectric cantilever and the piezoelectric voltage output are increased. In addition, the double-arc-shaped flow choking structure of the frame can enlarge the contact area between the friction layers, and the friction voltage output is increased.

An electronic camera module includes a lens or refractive element formed by a pair of immiscible liquids and having optical properties which can be varied by applying a voltage so as to deform the meniscus. One of the two liquids extends from the meniscus all the way to the front surface of the sensor, so that light passing through the meniscus does not encounter further changes in refractive index enroute to the sensor.

A touch panel that includes a dielectric film and a piezoelectric film. A first capacitance detection electrode is disposed on an upper main surface of the dielectric film, a second capacitance detection electrode and a first piezoelectric voltage detection electrode are disposed between a lower main surface of the dielectric film and an upper main surface of the piezoelectric film, and a second piezoelectric voltage detection electrode is disposed on a lower main surface of the piezoelectric film. The first capacitance detection electrode includes plural sub-electrodes extending in a first direction, the second capacitance detection electrode includes plural sub-electrodes extending in a second direction orthogonal to the first direction, and the first piezoelectric voltage detection electrode includes plural sub-electrodes disposed between the plural sub-electrodes.

A circuit module, in particular for use in a vehicle tire, having at least: a housing (2), a piezoelectric generator (3), which has a mass element (10) that is movable within the housing (2) and a spring device (12, 14), which has at least one piezoelectric element (14), the mass element (10) and the spring device (12, 14) forming an oscillatory system, and the piezoelectric element (14) being elastically deformable in response to the oscillation of the oscillatory system (10, 12, 14); and a current-supply circuit (5) for receiving a piezoelectric voltage output by the piezoelectric element (14) in response to the mechanical deformation thereof and for supplying power to the circuit module (1).

A circuit module, in particular a tire sensor module, which at least includes: a substrate, on or in which at least one component is mounted, a piezoelement, which has at least one clamping region and at least one oscillatory region, the piezoelement being clamped in its clamping region on the substrate or on an arrangement secured to the substrate, and its oscillatory region being accommodated in a manner that permits oscillation, contacts provided on the piezoelement for tapping off a piezoelectric voltage, and a current-supply circuit, which receives the piezoelectric voltage generated by the piezoelement, being used as a voltage source for supplying power to the circuit module. The piezoelement is preferably clamped between at least two substrate elements, at least one cavity being formed within which the at least one oscillatory region of the piezoelement is accommodated in a manner that permits deflection, and is limited in its oscillation displacement.

A power-generating unit for a tire sensor module of a vehicle tire has: a piezoelectric element, which is displaceable between a first stable bent position and a second stable bent position and outputs a piezoelectric voltage upon the displacement between the stable bent positions, and a restoring unit for the mechanical displacement of the piezoelectric element from the first stable bent position into the second stable bent position, the restoring unit being activatable by a deformation acting on the power-generating unit, e.g., in a deformed tire area of the vehicle tire above its tire contact patch. The piezoelectric element is clamped in receptacles at its end areas and has two oppositely arched stable bent positions having unstable intermediate states.

A tire sensor module for use in a vehicle tire including at least one sensor device for measuring at least one measured variable and for outputting at least one measuring signal, a control device, e.g., an analyzer ASIC for receiving the measuring signal and for outputting at least one transmitted signal to a wireless interface for emitting the transmitted signal to a receiver in or on the vehicle, and an energy accumulator, in particular a battery, for supplying power to at least the control device. A switching device is provided between the energy accumulator and the control device which interrupts or closes the power supply of the control device by the energy accumulator as a function of a control signal, and an electromechanical energy transducer which, under the effect of a deformation, a motion and/or a pressure change, outputs the control signal, in particular a piezoelectric voltage, to the switching device for closing the power supply.

The present invention discloses a piezoelectric-electromagnetic hybrid MEMS vibration energy collector and a preparation method thereof. A movable permanent magnet is used as a pick-up structure. Under the effect of a vibration environment, the movable permanent magnet moves in a cavity, thus the magnetic flux in a spiral inductance coil is changed, induction current is generated in a closed loop formed by the spiral inductance coil and an external load, and the conversion of vibrational energy into electrical energy through an electromagnetic induction mode is realized. In addition, when the movable permanent magnet moves in the cavity, the generated pressure or impact causes the bending deformation of a first square film or a second square film, the deformation of a piezoelectric layer is caused to generate piezoelectric voltage, the conversion of the vibrational energy into the electrical energy through a piezoelectric effect is realized, and the piezoelectric electrode of the piezoelectric layer is connected to supply power to the load. According to the piezoelectric-electromagnetic hybrid MEMS vibration energy collector and the preparation method, the modes of electromagnetic induction and piezoelectric effect are combined to convert the vibrational energy into the electrical energy, and the electromagnetic induction and the piezoelectric effect are superimposed to supply power to the load.

The invention relates to a method for preparing a textured zinc oxide nanowire film, with a core-shell structure, growing on the surface of carbon fiber. The preparing method comprises the following steps of: removing a sizing agent on the surface of the carbon fiber or carbon fiber fabric, mixing zinc oxide powder and active carbon to obtain mixed zinc powder, feeding the mixed zinc powder as a growth source to a sealed tube type furnace, slowly vacuumizing, slowly introducing argon and oxygen mixed gas, heating to 850 DEG C, preserving the heat for 10min, then heating to 960 DEG C and preserving the heat for 30min, and then cooling, wherein the piezoelectric voltage of the zinc oxide film is educed through an electrode between the carbon fiber and the top of the zinc oxide, and the connection between the surface of the zinc oxide film and the electrode is of schottky connection. A device disclosed by the invention can be used as a gas pressure sensor or a pneumatic pressure nano engine of automobile/aircraft tyres. Besides, the device disclosed by the invention can also be used as a self-powered sensor for continuously monitoring pulse condition characteristic regions, such as pulse vibration frequency, pulse amplitude, and the like through a piezoelectric current change curve and provides a support for quantification representation of modern human body internet of things of traditional Chinese medicine.

One or more piezoelectric pads are disposed into a keyboard and electrically connecting to a rechargeable battery of an electronic device or a portable electronic device. When one button of the keyboard is pressed, the movement of the button pushes and deforms the corresponding piezoelectric pad to generate a piezoelectric voltage for charging the battery. The electronic device or the portable electronic device can deal with power shortage during usage with the feature of transforming mechanical power into electrical power by using piezoelectric pads in the keyboard.

A textured PMN-PZT ceramic is created using templated grain growth to align seed crystals in a ceramic matrix powder by tape-casting process. Heat treatment then results in the nucleation and growth of matrix crystals on aligned templates. The resulting textured PMN-PZT ceramic has high longitudinal piezoelectric coefficient and a high piezoelectric voltage coefficient. In another embodiment, a textured PMN-PT ceramic has a volume fraction of the templates no greater than 1%. The utility of this invention includes both its exceptional piezoelectric properties as well as the utilization of an economical manufacturing process that is widely used in the multi-layer ceramic capacitor industry.

A nanomechanical magnetoelectric antenna includes a thin film heterostructure that has a magnetic element and a piezoelectric element. The heterostructure is suspended on a substrate and is capable of resonating at acoustic resonance frequencies. In the transmission mode of the antenna, oscillating mechanical strain produced by voltage-induced acoustic waves is transferred to the thin film heterostructure through strain mediated magnetoelectric coupling. This gives rise to magnetization oscillation or magnetic current that radiates electromagnetic waves at the acoustic resonance frequencies. In the receiving mode, the heterostructure senses magnetic components of electromagnetic waves arriving at the antenna, converting these into a piezoelectric voltage output.

Provided are a droplet emitting apparatus and a method of emitting droplets using the same. The apparatus includes a solution tank for containing a solution; a nozzle including an opening through which at least a droplet of the solution is emitted; and a voltage generator including a piezoelectric material for generating a voltage by instantaneous pressure application, wherein the voltage generated by the pressure to the piezoelectric material is applied to the solution in order for the at least a droplet of the solution to be emitted through the nozzle

A driving device for a piezoelectric actuator supplies charges and discharges the piezoelectric actuator through a charging switch and a discharging switch, respectively. The charging switch is repeatedly turned on and off thereby to charge and expand the piezoelectric actuator. The discharging switch is repeatedly turned on and off thereby to discharge and contract the piezoelectric actuator. The discharging switch is kept ON especially during a period from when the discharging switching control is terminated to when the charging switching control is started next. Thus, the piezoelectric voltage at the start of the next driving can be made substantially 0V.

The invention relates to the technical field of sensors, and discloses an MEMS humidity sensor and an operation method thereof. The humidity sensor comprises a substrate, a first insulating layer located above the substrate, and a piezoelectric sensor unit and an electrochromic unit which are located above the first insulating layer and arranged at intervals; the piezoelectric sensor unit is connected with one side of the electrochromic unit through a display switch unit; a reset switch unit is arranged on the other side of the electrochromic unit; and when the display switch unit is switchedon and the reset switch unit is switched off, the piezoelectric sensor unit is deformed after absorbing moisture and generates a piezoelectric voltage, and the electrochromic unit generates a reactionunder the action of the piezoelectric voltage so as to display humidity information through color change. According to the MEMS humidity sensor, a complex interface circuit does not need to be additionally arranged, and the humidity information of a current environment can be obtained directly and quickly through human eyes; and the sensor has the advantages of being simple to design and manufacture, low in cost, small in size, low in power consumption and the like.

The method comprises: using the traditional lumped parameter equivalent-circuit model of the piezoelectric transformer, and using the admittance matrix Y to express the voltage gain, output power and correlated relation between the transmission efficiency specification and the piezoelectric transformer connection numbers (n) of the piezoelectric transformer.