58results about How to "Good piezoelectric effect" patented technology

A piezoelectric element is provided which enables superior piezoelectric effects to be attained while having a comparatively simple structure and being easy to produce. The piezoelectric element according to the present invention includes a plurality of strip-shaped flexible sheets having: a dielectric elastomer layer; and an electrode layer that is stretchable and laminated on the dielectric elastomer layer, the plurality of flexible sheets being superposed crosswise on each other and alternately folded in an accordion shape such that the flexible sheets are alternately stacked. It is preferred that at least one of the plurality of flexible sheets includes a pair of the dielectric layers laminated on front and back face sides of the electrode layer. The pair of flexible sheets are preferably superposed on each other crosswise at substantially right angles. The flexible sheets are preferably stacked to give no less than 10 layers and no greater than 10,000 layers.

A controllable intelligent magnetorheological piezoelectric vibration isolation support comprises a lower steel plate and an upper cover plate. Magnetorheological liquid is arranged in four grooves inside the lower steel plate. High-magnetic sliding columns are arranged in the grooves. Excitation coils encircle the high-magnetic sliding columns. Meanwhile, a hydraulic telescopic rod is arranged between every two adjacent high-magnetic sliding columns. The tops of the high-magnetic sliding columns are connected with small friction plates. The small friction plates are connected with a large friction plate. The upper portion of a rubber body filled with magnetorheological gels is connected with the large friction plate, and the lower portion of the rubber body is directly connected with the lower steel plate. The upper portion of the large friction plate is connected with the upper cover plate through four rubber laminates. The large friction plate and the upper cover plate bear force stably through an upper force transmission cushion plate, a lower force transmission cushion plate and a supporting steel body filled with piezoelectric stacks. Rubber cushion layers are stuck to the interiors of the two side walls of the upper cover plate. Pressure sensor modules arranged inside the rubber cushion layers are matched with wireless transmission modules arranged on the two sides of the large friction plate. According to the controllable intelligent magnetorheological piezoelectric vibration isolation support, real-time monitoring is achieved, and the vibration isolation support is controlled actively to reset and has the advantages of quick response and high sensitivity.

The invention relates to the technical field of fingerprint identifications, and in particular to an ultrasonic fingerprint identification module group, an ultrasonic fingerprint identification deviceand electronic equipment. The ultrasonic fingerprint identification module group is disposed at an opposite side of one side of a display module for displaying; the ultrasonic fingerprint identification module group includes ultrasonic fingerprint identification modules and a non-conductive substrate; the ultrasonic fingerprint identification modules are stacked on the surface, which is close toa display module, of the non-conductive substrate; each ultrasonic fingerprint identification module includes an upper electrode layer, a piezoelectric layer and a lower electrode layer which are disposed in lamination; the upper electrode layer and the lower electrode layer are respectively disposed on two opposite surfaces of the piezoelectric layer; and the lower electrode layer is close to thenon-conductive substrate. The ultrasonic fingerprint identification module group, the ultrasonic fingerprint identification device and the electronic equipment have the advantages of simple structure, high integration level and thin thickness.

The invention discloses a reticular composite membrane matrix with a porous structure and a preparation method thereof. The reticular composite membrane matrix is prepared by melting, homogenizing andfoaming a composite polymer and a composite filler and then carrying out directional longitudinal and transverse hot melt spinning. The invention further discloses a flexible porous composite membrane material based on the composite membrane matrix and doped with a piezoelectric photocatalytic material and preparation of the flexible porous composite membrane material, the obtained flexible porous composite membrane material has high flexibility, high porosity and high ventilation capacity, and the doped and loaded piezoelectric catalyst can form a piezoelectric effect; the catalytic performance of the photocatalyst under the indoor weak light condition is improved, organic pollutants are effectively degraded, and bacteria resistance and virus killing are achieved; and the film combiningmaterial has excellent mechanical properties, and can tolerate vibration generated by high-frequency airflow for a long time.

The invention discloses a lead-free piezoelectric film material, which is a ferrocolumbium barium titanate calcium strontium film material with the ingredient and chemical formula of (Ba0.9CaxSr0.1-x)(Ti0.87Nbyfe0.13-y)O3, wherein x in the formula is more than 0 and is less than 0.1, and y is more than 0 and is less than 0.13. The material is obtained by that sol is prepared with an improved sol-gel method, and the sol is subjected to film formation by the spin-coating technology and is annealed. The piezoelectric coefficient d33 of the material is 320pC/N. In addition, the lead-free piezoelectric film material has the advantages of low leakage current, dense surface, even grain size, strong electric hysteresis effect and the like and is free from the microcrack. The lead-free piezoelectric film material has an important meaning for applying the ferroelectric film in the micro-electronics field.

The embodiment of the invention discloses a resonance device and an acoustic filter. The resonance device comprises a wafer substrate, a piezoelectric layer and an interdigital electrode layer. The piezoelectric layer is located on one side of the wafer substrate and comprises a piezoelectric single crystal material, and the piezoelectric single crystal material comprises a first crystal axis, a second crystal axis and a third crystal axis which are perpendicular to one another; the direction of an electric field generated by the interdigital electrode layer in the piezoelectric layer is a device direction; wherein the first crystal axis is perpendicular to the wafer substrate, the included angle between the device direction and the second crystal axis is A1, and A1 is larger than or equal to minus 30 degrees and smaller than or equal to 10 degrees; or, the first crystal axis is perpendicular to the wafer substrate, the included angle between the device direction and the second crystal axis is A2, and A2 is larger than or equal to 170 degrees and smaller than or equal to 210 degrees; or, the included angle between the second crystal axis and the direction perpendicular to the wafer substrate is an angle B1, B1 is larger than or equal to-20 degrees and smaller than or equal to 40 degrees, the included angle between the device direction and the first crystal axis is an angle B2, B2 is larger than or equal to-20 degrees and smaller than or equal to 20 degrees; and the working frequency and the performance of the resonator device are improved while the low manufacturing cost of the resonator device is ensured.

The invention discloses a method for high-precision measurement of the sphericity of the micro-spherical probe of a nanometer three-coordinate measuring machine. A tungsten probe with large length-to-diameter ratio and a quartz tuning fork are combined. Scanning probe heads with nanometer-level resolution are constructed based on a precision micro stage. During measurement, the two scanning probe heads are driven by the micro stage to scan the large-section contour of a microsphere in the x-axis direction in a differential manner. Radial error generated in the scanning process can be automatically eliminated in a differential manner, and thus, accurate parameters of the large-section contour of the microsphere can be obtained. After the microsphere is rotated a certain angle, the measurement is repeated to acquire multiple sets of parameters of the large-section contour. A three-dimensional spatial contour of the microsphere is constructed through fitting according to feature points obtained. The geometric parameters of the microsphere are calculated based on the three-dimensional spatial contour. Thus, high-precision measurement of the sphericity of the microsphere is realized. The method has the characteristics of small measuring force, wide measuring range, and high measuring precision.

The invention relates to the technical field of fingerprint identification, in particular to a display device and electronic equipment. The display device of the invention includes a first piezoelectric module, a display module and a second piezoelectric module. The first piezoelectric module and the second piezoelectric module are disposed on two opposite surfaces of the display module. The display device and the electronic equipment of the invention have the advantages of simple structure and high reliability, and are more in line with the trend of light and thin making and high integrationdegree of the electronic equipment.

The invention belongs to the technical field of magneto-optic piezoelectric crystal growth and specifically relates to a terbium gallium silicate magneto-optic piezoelectric crystal and a growth method thereof. The terbium gallium silicate magneto-optic piezoelectric crystal has a molecular formula Tb3Ga5SiO14. The preparation method comprises the following steps: (1) synthesis of initial raw materials; (2) single crystal growth; and (3) crystal annealing. By using the preparation method, the terbium gallium silicate magneto-optic piezoelectric crystal with high optical quality, relatively large size and good physical properties can be obtained. The magneto-optic crystal has good magneto-optic and piezoelectric effects and has a Verdet constant being higher than that of a terbium-doped glass and terbium gallium garnet (TGG) crystal commercially applied at present. Meanwhile, the magneto-optic piezoelectric crystal disclosed by the invention is on a 400-1500 nm waveband and shows relatively high transmittance on other wavebands except for a 485 nm waveband near where there is a characteristic absorption peak of Tb<3+> ions. In addition, the magneto-optic piezoelectric crystal disclosed by the invention is a congruent molten compound capable of growing by adopting a medium-frequency induction pulling method, and the growth process is simple, short in period and capable of realizing large-scale mass production with low cost.

The invention provides an application of a nickel-doped molybdenum sulfide material in self-energized piezoelectric enhanced hydrogen production. The nickel-doped molybdenum sulfide material (Ni-MoS2)comprises a molybdenum sulfide MoS2 material with response to near-infrared light and divalent nickel ions doped in molybdenum sulfide and on the surface of molybdenum sulfide. The nickel-doped molybdenum sulfide material provided by the invention can effectively utilize natural mechanical energy (such as vibration, noise, ultrasonic wave, stirring and the like), takes ammonia borane with the hydrogen content as high as 19.6 wt% as a hydrogen storage material to prepare hydrogen energy at normal temperature and normal pressure, and realizes self-energized piezoelectric enhanced hydrogen production. The hydrogen fuel can be prepared and used at any time, and the problem that hydrogen is not easy to store is solved. The preparation method of the nickel-doped molybdenum sulfide material provided by the invention is simple, feasible, green and environment-friendly.

The invention provides an application of a strontium-doped molybdenum sulfide material in self-energized piezoelectric enhanced hydrogen production. The strontium-doped molybdenum sulfide material (Sr-MoS2) comprises a molybdenum sulfide MoS2 material with response to near-infrared light and divalent strontium ions doped in molybdenum sulfide and on the surface of molybdenum sulfide. The strontium-doped molybdenum sulfide material provided by the invention can effectively utilize natural mechanical energy (such as vibration, noise, ultrasonic wave, stirring and the like), takes ammonia boranewith the hydrogen content as high as 19.6 wt% as a hydrogen storage material to prepare hydrogen energy at normal temperature and normal pressure, and realizes self-energized piezoelectric enhanced hydrogen production. The hydrogen fuel can be prepared and used at any time, and the problem that hydrogen is not easy to store is solved. The preparation method of the strontium-doped molybdenum sulfide material provided by the invention is simple, feasible, green and environment-friendly.

The invention provides a piezoelectric device and a manufacturing method thereof, an electronic device and a control method, and relates to the technical field of piezoelectric devices. The piezoelectric device has bendability, can be bent, and comprises a flexible substrate and a plurality of piezoelectric units arranged on the flexible substrate in an array mode, wherein each piezoelectric unitcomprises a first electrode, a piezoelectric part and a second electrode which are sequentially stacked on the flexible substrate, and the piezoelectric part is made of a rigid material. The method issuitable for manufacturing the piezoelectric device.

The invention provides an application of an iron-doped molybdenum sulfide material in self-energized piezoelectric enhanced hydrogen production. The iron-doped molybdenum sulfide material (Fe-MoS2) comprises a molybdenum sulfide MoS2 material with response to near-infrared light and divalent iron ions doped in molybdenum sulfide and on the surface of molybdenum sulfide. The iron-doped molybdenum sulfide material provided by the invention can effectively utilize natural mechanical energy (such as vibration, noise, ultrasonic wave, stirring and the like), takes ammonia borane with the hydrogen content as high as 19.6 wt% as a hydrogen storage material to prepare hydrogen energy at normal temperature and normal pressure, and realizes self-energized piezoelectric enhanced hydrogen production.The hydrogen fuel can be prepared and used at any time, and the problem that hydrogen is not easy to store is solved. The preparation method of the iron-doped molybdenum sulfide material provided by the invention is simple, feasible, green and environment-friendly.

The embodiment of the invention discloses a resonance device and a filter. The resonance device comprises a wafer substrate, a piezoelectric layer and an interdigital electrode layer. The piezoelectric layer comprises a piezoelectric single crystal material; the main positioning edge of the wafer substrate is located in a first direction, and the piezoelectric single crystal material comprises a first crystal axis, a second crystal axis and a third crystal axis; the first crystal axis is perpendicular to the wafer substrate, or the first crystal axis is parallel to the wafer substrate, and the included angle between the first crystal axis and the first direction is smaller than or equal to 30 degrees, or larger than or equal to 60 degrees and smaller than or equal to 120 degrees; and the second crystal axis is parallel to the wafer substrate, and the included angle between the second crystal axis and the first direction is smaller than or equal to 60 degrees, or the included angle between the second crystal axis and the direction perpendicular to the wafer substrate is larger than or equal to 120 degrees and smaller than or equal to 135 degrees. According to the technical scheme, the advantage of low cost of the resonator device is guaranteed, the performance and the working frequency of the resonator device are improved, the performance of the band-pass filter comprising the resonator device is improved, and the requirement of the 5G communication standard is met.

The invention relates to a kind of double-structure, multi-functional pressing engine, including high-pressure bar, pressure-adjusting pole, pressure-exchanging pole, prying pole, semimonthly fork, the big rack, spring piece, spring hook, connecting rod, gyro wheel, hanging tracks, hanging wheel, main shaft, round shaft, support, brakes, and so on. On the component that consists of double-structure set up the connection of self-anti-elastic, self-pushing and self-rotating. That can develop the energy-supporting functions, such as generating electricity, transporting, and the effective energy-saving efficiency.

The invention discloses a tough cement-based piezoelectric composite material, a preparation method and application thereof. The composite material is prepared by dispersing perovskite piezoelectric crystals and cement in certain proportion into a PVDF-based piezoelectric material. The composite material not only has excellent piezoelectric properties, but also has high toughness and good compatibility with a concrete material, and solves the problems of high brittleness and poor combination with overall concrete structure in existing cement-based piezoelectric materials. Also the composite material can be applied to preparation of a sensor for a concrete building structure in civil engineering, the prepared sensor has high sensitivity and sensing precision, and potential safety hazards are reduced.

The invention relates to a preparation method of a high-efficiency bone repair material and belongs to the technical field of preparation of artificial medical materials. The preparation method in theinvention comprises the following steps: mixing calcium chloride and barium chloride serving as raw materials to obtain a mixed solution; carrying out an ultrasonic oscillating reaction of the mixedsolution and EDTA (Ethylene Diamine Tetraacetic Acid) to produce self-made complexing liquor; carrying out a reaction of absolute ethyl alcohol and phosphorus pentoxide to produce phospholipid, and gradually hydrolyzing the phospholipid to obtain a precursor solution under the effect of ammonium hydroxide; dropping the self-made complexing liquor into the precursor solution to obtain a hydroxy calcium phosphate skeleton, wherein along with the reaction, after the calcium ion and phospholipid are bound to be saturated, one part of barium ions are bound with hydroxyl on the surface of hydroxy calcium phosphate so as to obtain hydroxy calcium phosphate doped with a small amount of barium ions; dissolving tetrabutyl titanate into ethanol, carrying out a blending reaction of the tetrabutyl titanate and the hydroxy calcium phosphate doped with a small amount of barium ions, introducing a titanium source into hydroxy calcium phosphate, and finally calcining, thereby obtaining the high-efficiency bone repair material. The high-efficiency bone repair material prepared by the preparation method disclosed by the invention is capable of realizing high-efficiency repair after transplantation and has wide application prospects.