1687 results about "Piezoelectricity" patented technology

In one aspect, the present invention relates to a pressure sensing / force generating device comprising a non-planar substrate, a printed pressure sensitive element comprising (a) a piezoelectric material containing ink composition capable of producing a piezoelectric effect / piezoresistive effect and / or (b) a dielectric material containing ink composition capable of producing a capacitive effect. It also includes a first printed electrode comprising a conductive ink composition, and a second printed electrode comprising a conductive ink composition. The first and second electrodes are in electrical contact with the printed pressure sensitive element. The first and second printed electrodes and the printed pressure sensitive element collectively form a pressure sensitive junction, which is coupled to the non-planar substrate. The present invention further relates to medical devices comprising the pressure sensing / force generating device and methods of making such devices.

Method and apparatus on charges injection using piezo-ballistic-charges injection mechanism are provided for nonvolatile memory device. The device has a strain source, an injection filter, a tunneling gate, a ballistic gate, a charge storage region, a source, and a drain with a channel defined between the source and drain. The strain source permits piezo-effect in ballistic charges transport to enable the piezo-ballistic-charges injection mechanism. The injection filter permits transporting of charge carriers of one polarity type from the tunneling gate through the blocking material and the ballistic gate to the charge storage region while blocking the transport of charge carriers of an opposite polarity from the ballistic gate to the tunneling gate. The present invention further provides an energy band engineering method permitting the memory device be operated without suffering from disturbs, from dielectric breakdown, from impact ionization, and from undesirable RC effects.

In one aspect, the present invention relates to a pressure sensing / force generating device comprising a non-planar substrate, a printed pressure sensitive element comprising (a) a piezoelectric material containing ink composition capable of producing a piezoelectric effect / piezoresistive effect and / or (b) a dielectric material containing ink composition capable of producing a capacitive effect. It also includes a first printed electrode comprising a conductive ink composition, and a second printed electrode comprising a conductive ink composition. The first and second electrodes are in electrical contact with the printed pressure sensitive element. The first and second printed electrodes and the printed pressure sensitive element collectively form a pressure sensitive junction, which is coupled to the non-planar substrate. The present invention further relates to medical devices comprising the pressure sensing / force generating device and methods of making such devices.

The invention discloses a dandelion-like multi-directional broadband piezoelectric vibration energy collection device, comprising a multi-spherical support body, a vibration base and at least two cantilever beams, the vibration base is fixed to a surface of the multi-spherical support body, and each cantilever beam is fixed to the surface of the multi-spherical support body along different directions; the cantilever beam comprises an elastic metal conductive slice, an upper-layer piezoelectricity ceramic piece, a lower-layer piezoelectricity ceramic piece and a mass block, a fixing end of the elastic metal conductive slice is fixed to the surface of the multi-spherical support body, and the mass block is fixed to a free end of the elastic metal conductive slice, and the upper-layer piezoelectricity ceramic piece and the lower-layer piezoelectricity ceramic piece are respectively adhered to an upper surface and a lower surface of the elastic metal conductive slice in same direction. The dandelion-like multi-directional broadband piezoelectric vibration energy collection device can collect the vibration energy with relatively high efficiency no matter how vibration direction changes or when the vibration changes in multiple directions with multiple frequencies.

A touchscreen panel input device is manufactured by forming a first adhesion layer and a second adhesion layer on a growth substrate, removing only the second adhesion layer from a selected region by irradiating laser, forming a growth base layer on the selected region where the second adhesion layer is removed and on the second adhesion layer and an oxide thin film having piezoelectricity on the growth base layer, transferring the oxide thin film layer on the selected region to a second substrate having first transparent electrodes by peeling-off, and adhering the second substrate to a third substrate having second transparent electrodes by placing the transferred oxide thin film layer between them. The touchscreen panel input device detects a pushing pressure in addition to a touch position with proving a tactile feedback.

An example flexoelectric piezoelectric material has a piezoelectric response, which may be a direct piezoelectric effect, a converse piezoelectric effect, both effects, or only one effect. A flexoelectric piezoelectric material comprises shaped elements of a material, which may be a substantially isotropic and centrosymmetric material. The shaped elements, such as cones, pyramids, wedges, or other tapered elements, may provide an electrical response in response to stress or strain gradients due to a flexoelectric effect in the material, and may provide a mechanical response in response to electric field gradients. Examples of the present invention include improved methods of fabricating devices comprising such shaped elements, and multi-layer devices having improved properties.

The invention relates to a board band piezoelectric generating set. A plurality of socle beams L1, L2, L3 are divided into two groups; one end of each socle beam is fixed and the other end keeps free; the socle beams keep parallel with each other; a crossing section is arranged between the two groups of the socle beams; wherein, the socle beam consists of piezoelectric transduction elements (34, 36), a down-lead (31), a metal block (32) and electrodes (33, 35, 37). The electrodes and the transduction elements are alternately arranged; the down-lead (31) is arranged at the fixed end of the socle beam; the metal block (32) is arranged at the free end of the socle beam. The sizes and the structures of the socle beams L1, L2, L3 are different, the manufacture materials of the piezoelectric transduction elements are different and the qualities of the metal blocks are different, therefore, the resonance frequency of each beam is different. The two groups of the socle beams L1, L2, L3 are arranged in an interdigital structure in plane or an interdigital structure in space. The board band piezoelectric generating set can absorb the mechanical vibration or noise of a plurality of frequency components in the environment and realize the transformation from mechanical energy to electricity energy by the piezoelectric transduction elements so as to increase the generating capacity and improve the generating efficiency.

There are provided a method for uniform mixing of materials, which comprises arranging two or more droplet-discharging means of piezoelectricity-controlled type, discharging fine droplets from respective droplet-discharging means, and colliding them with each other to achieve uniform mixing, and an apparatus therefor. The directions of discharging from these droplet-discharging means are set so that the fine droplets discharged from respective droplet-discharging means are collided with each other at an angle of about 90° or 0 to 20°. The method and apparatus enables mixing and reaction of very small amounts of materials.

This invention relates to one flexible microphone and its process method, which forms sound to same direction with flexible piezoelectricity materials property by flexible driver parts, vibration film, and vibration electrode to overcome traditional technique defaults.

The invention provides an engineering nonlinear vibration inspection method. The method adopts a wavelet nonlinear threshold value filtering wave to filter wide-frequency background noise of a three-direction acceleration signal and to remove DC bias so as to get the treated acceleration signals after frequency domain filtering and removal of trend term. Then speed signals and displacement signals are obtained after the acceleration signals is subject to a first time and second time integrals and removal of trend term. The characteristics and types of the nonlinear vibration are determined through a three-dimensional phase space diagram and other calculations of a reconstructed phase space tested by the three-dimensional phase space diagram. The invention adopts three-direction low resistance piezoelectricity acceleration meter to measure the vibration accelerations of three orthogonal directions. The invention has convenient installation, easy usage and reliable analysis, overcomes the problems of drifting, delay and aberration of the actual acceleration signals after passing through analog integration or digital integration. The invention plays an important role in the engineering nonlinear vibration inspection for mechanical mechanisms, bridges, dams and buildings, etc.

The invention discloses a fingerprint identification display panel, a production method thereof, a driving method thereof, and a display device. A plurality of ultrasonic wave detection units, a plurality of identification scanning lines, and a plurality of identification output lines are disposed in the display device. Every ultrasonic wave detection unit comprises a pressure-sensing unit used for generating ultrasonic waves and sensing the changes of the ultrasonic waves caused by pressing of fingerprints, and a control switch transistor used for controlling the pressure-sensing unit to convert the changes of the ultrasonic waves into different signals for output. When fingers of users are close to the surface of the display device, because of the uneven ridges and the uneven valleys of the skins of the fingers, the intensities of the ultrasonic waves transmitted by the pressure-sensing units reflected by the positions of the ridges and the valleys of the fingers back to the pressure-sensing units are different, and then the differences of the current signals converted by the pressure-sensing units are caused, and therefore the detection of the fingerprints is realized. The pressure-sensing unit is used for the detection of the fingerprints based on piezoelectric effect, and interferences on the internal parts in the display device are not easy to generate, and therefore high-quality fingerprint detection is easily realized.

The invention relates to a polymeric thin film polarization method and device, a polarized film, and an electronic device. The polymeric thin film polarization method and device are characterized in that the ambient gas above the polymeric thin film to be polarized by means of X rays and passes through a low electric field to be deposited on the surface of the polymeric thin film under the effect of a high electric field, so that an in-film electric field along the thickness direction of the thin film is formed in the polymeric thin film, and the polarization of the polymeric thin film can be completed. The production qualified rate of a polarized film can be effectively improved, and the environmental pollution is reduced. The invention further provides a polarized film which is prepared by means of the polymeric thin film polarization method, so that the piezoelectric effect is high and the service life is prolonged. The invention further provides an electronic device, a base and an original position are formed on the polarized film on the base, so that the application of the electronic device is effectively widened, and the competitiveness is enhanced.

The invention discloses an experiment testing method and device to test stressed state of product when falling on the ground. It has a clamping device to hang the object, and a piezoelectricity sensing platform is set under it. A CCD camera is set outside the platform. Impact accelerometer is set on the testing point of the testing object. Using a monitoring program to start clamping device to drop the object in free falling state, recording the process until the object knocking at the piezoelectricity sensing platform trigger circuit, starting CCD camera to capture the process, calculating falling angle, taking simulation test, and comparing simulation G value and accelerometer testing G value, the accurate testing value would be gained. It would effectively improve economic benefit.

The present invention involves increasing the quantum efficiency in titania photocatalysts for photocatalytic (oxidation of acetaldehyde) and photosynthetic (photosplitting of water) reactions by integrating the titania photocatalyst with a polar mineral having surface electrical fields due to pyroelectric and piezoelectric effects, and by adjusting the nanostructure of the photocatalyst materials. The photocatalytic reactivity of titania powder is increased due to the effect of electric field present on the surface of polar mineral material on the photocatalytic effect of commercial titania with respect to photolysis of water. Additionally, the photocatalytic performance of pure phase rutile and anatase nanostructures with well defined morphologies was found to improved with respect to certain photocatalytic reactions in comparison with non-structured titania.

A method for polarizing a polymer film is disclosed. An ambient gas above a polymer film under the action of a first electric field is ionized, the ambient gas accumulates on the second surface of the polymer film through the second electric field, an organic electric field in the film thickness direction is formed in the molecular thin film, and the polymer film is polarized. The polymer film polarization method can avoid the breakdown of the polymer film, effectively improve the production rate of the polarized film, can achieve large-scale production; and the resulting polarized film has a strong piezoelectric effect and longer Service life. The present invention also provides a polarizing film prepared by the above-described method of polymer film polarization, which has a strong piezoelectric effect and a long service life. The present invention also provides an electronic device comprising a substrate and a polarizing film as described above.

The invention discloses a testing device for bearing dynamic characteristic parameters. The testing device for the bearing dynamic characteristic parameters is composed of an instrument and equipment system, and a testing device. The instrument and equipment system comprises a data collector, a signal conditioning instrument, a power amplifier, a digital indicator, a vibration exciter, an impedance head, a piezoelectricity accelerating speed sensor, and an electronic computer. The testing device comprises an iron cast platform, a mounting base plate, a bearing seat, a bearing sleeve, a bearing, a mandrel, a shaft end nut, a pre-tightening nut, a rubber spring, an axial loading device, a radial loading device, a pre-tightening device, a bracket, an elastic rope and the like. The testing device for the bearing dynamic characteristic parameters is compact in structure and clear in test principle, the loading devices are infinitely adjustable, and the testing devices can measure the bearing dynamic characteristic parameters under load condition of different axial force, radial force, pre-loading force and the like. When measurement is conducted, vibration force direction penetrates through mandrel axis to measure vibration signals of an inner ring and an outer ring of the bearing at same time, affect from vibration signals of the bearing outer ring is eliminated when a displacement frequency response function is calculated, and the testing method is high in efficiency, precision, and stability.

The invention relates to a physiologic parameter monitoring device comprising a sensor unit, a processing unit and a notification unit; the sensor unit is used for acquiring a biological signal from the surfaces of ears of a user; the processing unit is used for processing the biological signal and outputting physiologic parameters, such as heart rate, heart rate change rate, blood pressure, blood pressure change rate, degree of blood oxygen saturation and body temperature; and the notification unit issues the physiologic parameters in a visual or audio way. The physiologic parameter monitoring device continuously detects one or a plurality of items of physiologic signals and parameters for the user under the condition of not interfering with the daily activities of the user. A power supply of a piezoelectric device of the sensor unit supplies power for the sensor unit by utilizing the piezoelectricity and can be used as a switch of the device and reduce the reliance on to batteries.

The invention relates to a preparation method of a zinc oxide varister, comprising two independent steps: preparing zinc oxide granules with doping ion components; and preparing a sintering material for coating the zinc oxide granules. According to the performance requirement of the varister, the doping components of the zinc oxide granules, the components of the high-impedance sintering material and preparation conditions are prepared in advance; finally, the zinc oxide granules and the high-impedance sintering material are evenly mixed according to a certain proportion, and the zinc oxide varister is prepared according to the conventional technology. The zinc oxide varister prepared by the preparation method not only has voltage-sensitive performance, but also has one or more functions of heat sensitivity, capacitance, inductance, piezoelectricity or magnetic characteristic, and the like, can sinter at low temperature (lower than 900 DEG C) and can use fine silver as an inner electrode.

The inventive silicon based piezo-electricity socle girder miniature power supply device, pertains to the micro-energy sources field in the electronic technology Micro Electro-Me-chanical Systems field. A silicon based piezo-electricity socle girder miniature electric generating apparatus is provided with a silica fixing frame, an oxidizing layer, a platinum / titanium lower metallic layer, a piezo-electricity PZT layer, a platinum / titanium upper metallic layer, an electrode insulation protection layer, and a vibrating base; the structure of the silica fixing frame combines the monocrystal silicon wet method etching and dry-etching to process, whose structure is integrated as a whole, and the center part of the structure is in a socle girder shape, which includes a silicium socle girder and a free end mass block; the piezo-electricity power supply device uses a micro-machining technique to integrally machine, and can realize the integration of the power supply and the microelectronic devices. The service-life of the power supply is long, the structure is simple, and the power supply is environmental protective and energy-saving, which can realize the multi-point disposition of wireless sensing network, without incessant replacement of power supply.

The invention discloses a minitype composite vibration power generator belonging to the field of minitype power technology and energy-saving technology. The minitype composite vibration power generator is a cantilever beam vibration power generator compounded by piezoelectricity and electromagnetism and mainly comprises an insulating shell, a piezoelectric cantilever beam, a permanent magnet and an inductance coil, wherein the piezoelectric cantilever beam consists of a piezoelectric sheet and a supporting substrate; the piezoelectric sheet is bonded on the supporting substrate; one end of the supporting substrate is fixed on the insulating shell; the permanent magnet is bonded with a free end of the piezoelectric cantilever beam; and an inductance coil is arranged right above the permanent magnet. Under the resonant state, the power generator synchronously outputs the piezoelectric current and the electromagnetic current; the output power is improved within the finite volume; furthermore, by adopting the structure of dispersing mass blocks, the energy collecting density is improved, and the working frequency scope is enlarged simultaneously.

Methods and devices for increase power output from solar devices. In one embodiment, the technique enables the front hot solar panel surface to be cooled by attachment of a thermoelectric multilayer stack to the back solar panel surface. The thermoelectric stack cools the solar panel front surface by drawing heat from the front to the back of the panel. That heat is transformed into mechanical vibrations using an inverse Peltier effect and that mechanical energy then transformed into electrical energy using a piezoelectric effect. Power output is first increased by lower operating temperature on front, resulting in a higher power conversion efficiency for the photovoltaic effect taking place in the CIGS / CdS active layers or other thin films, then from an additional power output from secondary electrical energy created from mechanical arising from the temperature-gradient driven occurrence of the thermoelectric effect.

To provide a wafer, made from a lithium tantalate single crystal or a lithium niobate single crystal, wafer which is charge restrained without impairing the piezoelectricity. Moreover, to provide a processing method and a processing apparatus therefor. It is characterized in that a wafer 50, made from a lithium tantalate single crystal or a lithium niobate single crystal, and a reducing agent 60, including an alkali metal or an alkali metal compound, are accommodated in a processing tank 2, and the inside of the processing tank 2 is held at a temperature of from 200° C. or more to less than a Curie temperature of the single crystal under decompression, thereby reducing the wafer 50.

In one aspect, the invention relates to a method for “tagging” proppants so that they can be tracked and monitored in a downhole environment, based on the use of composite proppant compositions containing dispersed fillers whose electromagnetic properties change at a detectable level under a mechanical stress such as the closure stress of a fracture. In another aspect, the invention relates to composite proppant compositions containing dispersed fillers whose electromagnetic properties change under a mechanical stress such as the closure stress of a fracture. The currently preferred embodiments use substantially spherical thermoset nanocomposite particles where the matrix comprises a terpolymer of styrene, ethylvinylbenzene and divinylbenzene, a PZT alloy manifesting a strong piezoelectric effect or Terfenol-D manifesting giant magnetostrictive behavior is incorporated to provide the ability to track in a downhole environment, and carbon black particles possessing a length that is less than 0.5 microns in at least one principal axis direction may optionally be incorporated as a nanofiller.

An apparatus and method to monitor endless belts and related belt drive systems by non-contact sensors for wear or an anomalous function, determining the state of belt drive system and detecting early stages of belt and system failure. A sensing unit featuring one or several independent sensor elements is placed near a belt of a polymer matrix with a fiber cord load bearing core to monitor several simultaneously occurring normal modes of operation. The sensor can determine soundness of the whole timing drive continuously by processing the collected signal and detecting structural damage. The collected data is processed by a microcontroller integrated with the sensor. The apparatus and method uses a non-contacting capacitor array having sensing element(s) connected to electronic circuitry that is adapted to sense the dynamic capacitance change coupled with electrocapacitive and piezoelectric effects exhibited by the belt. The sensor continuously monitors the belt during normal operation.

Intra-oral tissue conduction microphone apparatus and methods are described for internal, but non-surgically installed microphones located in the oral cavity. An intra-oral tissue conduction microphone may be attached, adhered or integrated with a removable dental appliance which is positioned against the inside surfaces of the cheek, palate or gingiva. The sensor serves as a component in a non-observable hearing, body sound monitoring or communications device that can operate in environments incompatible with most existing devices. Generally, a piezoelectric film serves as the sensor that is well matched to tissue and which directly converts to an electrical signal by the piezoelectric effect signals which are received through the oral mucosa, gingiva or palate.

The invention relates to an MEMS wideband piezoelectricity energy collector based on a bistable state frequency raising structure in the technical field of electric appliances, which comprises a frame, a bistable state beam arranged in the frame, a piezoelectric over hanging beam, a permanent magnet and a soft magnet. The MEMS wideband piezoelectricity energy collector is characterized in that twoends of the bistable state beam are both fixed on the frame, the permanent magnet is attached to the bistable state beam, on end of the piezoelectric over hanging beam is fixed on the frame, and thesoft magnet is arranged on the piezoelectric over hanging beam. The invention adopts a bistable state frequency raising structure to enable a piezoelectric transduction component to obtain greater output power in a low-frequency vibration environment. Compared with the prior MEMS piezoelectric energy collector, the invention has simple structure, easy manufacture and volume reduction, can be operated in a low-frequency environment, and can output stable frequency within wider environment vibration frequency range.

A capacitor component includes a capacitor including a plurality of internal electrodes, a capacitor body containing a piezoelectric material disposed in at least regions between the plurality of internal electrodes, and external electrodes connected to the plurality of internal electrodes; and an interposer disposed to be coupled to the capacitor and including a buffer substrate containing a buffer material having a degree of piezoelectricity lower than that of the piezoelectric material, and connection electrodes electrically connected to the external electrodes.

A power generation type AC magnetic field sensor based on magneto piezoelectric effect is a laminated structure consisting of magnetostrictive rod, a piezoelectric material, the magnetostrictive rod and a permanent magnetic material; the upper surface and the lower surface of the piezoelectric material are provided with silver membrane electrode respectively, and the magnetostrictive rods is equipped with a signal output lead. The sensor can detect the alternating current without power supply, so the sensor is an energy-saving device with zero power consumption. The sensor has the advantages of small volume and low weight, can detect the AC magnetic field bandwidth ranging from 500Hz to 70kHz, and keeps a good linear relation between the output voltage and the magnetic field amplitude. The sensor adopts a thin rod structure, thus greatly reducing the volume of the sensor, enhancing the sensitivity and the bandwidth of the sensor. A bias magnetic field provided for the thin rod is greatly reduced for using small size of the magnetostrictive material, and can be integrated with a sensitive body. The sensor can be applicable to passive detection of the alternating magnetic fields.

The invention relates to one semi-conductor materials to realize semi-conductive process meeting the high Curie piezoelectricity ceramics materials without lead, which comprises the following parts: (Na1 / 2Bi1 / 2)x(Ba1-x-y+z)TiO3+yM1+zM2O+0.02MnO2mol%, wherein, x=0.01-0.15; y=0.001-0.006; z=0.005-0.05; M1=0.0001-0.006; M2=0.005-0.05; Formula comprises micro semi-conductive element and additive components.