56 results about "Piezoelectric resonance" patented technology

A method and apparatus for screening samples to determine which samples include a target material. Generally, the samples are pre-screened to determine which of the samples have a piezoelectric resonance when irradiated with an electric field, to thereby indicate the presence of the target material. The samples that have the piezoelectric resonance are then further screened by a different process to confirm the presence of the target material. For example, samples that have the piezoelectric resonance are further screened for a specific nuclear quadrupole resonance (NQR), a specific nuclear magnetic resonance (NMR) or a specific visual characteristic, to confirm the presence of the target material in the sample. The apparatus and method can be used, for example, to search luggage at ports of entry for the presence of cocaine hydrochloride or heroin hydrochloride.

The invention provides a preparation method of a c-axis inclined AlN thin film with homogeneous buffer layer, which comprises the steps that: generating an uncrystallized AlN thin film buffer layer on a substrate which is made from Si, Mo, Pt and Au or combination thereof by means of magnetron sputtering; and generating a c-axis oriented AlN thin film with different inclination degrees by adjusting the deviation angle between the substrate and the center of a target material. The preparation method can overcome the problems that the lattice mismatch between the AlN thin film and the substrate such as Si and GaAs, and the like, is larger, and the control performance of the c-axis inclination degree is worse. When being taken as a piezoelectric layer of a piezoelectric resonance sensor, the AlN thin film generated by the method can reduce the energy consumption of sound wave in liquid and is good for improving the quality factor and the sensitivity of the sensor.

The invention provides a resonant piezoelectric pump working under the power frequency, and belongs to a piezoelectric resonance device. The resonant piezoelectric pump comprises a vibration excitingsystem consisting of piezoelectric ceramic, a tuning fork vibrator, a mass block, a bolt, a connector and an elliptic connecting piece, and a pump body consisting of an upper pump, an intermediate body, a lower pump body, a pump cavity film, an inlet valve, an outlet valve, a water inlet pipe plate and a water outlet pipe plate. Under driving by a power frequency power supply, the piezoelectric vibrator is bent to deform to generate periodic-changed inertia impact force; and the inertia impact force is acted on the pump cavity film through the connector and the elliptic connecting piece to realize oriented driving of fluids.

The present invention relates to a curing process for a piezoelectric ceramics buzzing sheet in a buzzer. According to the curing process, a metal sheet is placed on a sheet suction mold, the sheet suction mold adsorbs the metal sheet, and silk-screen printing is adopted to print an anaerobic glue onto the upper surface of the metal sheet; a piezoelectric resonance sheet is placed on the metal sheet, and is bonded on the metal sheet through the anaerobic glue; the metal sheet and the piezoelectric resonance sheet bonded on the metal sheet are removed from the sheet suction mold, and are packaged by adopting a vacuum package bag; the vacuum package bag filled with the metal sheet and the piezoelectric resonance sheet is placed in ultra-high hydrostatic hydraulic equipment to carry out pressing curing, wherein the pressure of ultra-high hydrostatic hydraulic pressure is more than or equal to 120 MPa, and a pressure keeping time is 3-5 minutes; and the vacuum package bag is removed from the ultra-high hydrostatic hydraulic equipment, and is unpacked, the metal sheet and the piezoelectric resonance sheet are firmly bonded, and the curing process is completed. According to the present invention, the force applying on the product is uniform, the bonding force is stable and reliable, the curing time is short, the production efficiency is improved, the product is not deformed, and the frequency consistency is good.

The invention provides a bulk acoustic wave resonator, a manufacturing method thereof, a filter and a radio frequency communication system. A bottom electrode protruding part formed on the periphery of a piezoelectric resonance layer and suspended above a cavity can prevent transverse waves generated by the piezoelectric resonance layer from being transmitted to the periphery of the cavity, and reflect the transverse waves back to an effective working area, so that sound wave loss is reduced, the quality factor of the resonator is improved, and finally the performance of a device can be improved. Furthermore, the overlapping parts of a bottom electrode overlapping part and the cavity and the overlapping parts of a top electrode overlapping part and the cavity are suspended, and the bottomelectrode overlapping part and the top electrode overlapping part are mutually staggered, so that a parasitic parameter can be greatly reduced, the problems of electric leakage, short circuit and thelike can be avoided, and the reliability of the device can be improved.

The invention provides a bulk acoustic wave resonator, a manufacturing method thereof, a filter and a radio frequency communication system. A bottom electrode concave part and A top electrode convex part formed on the periphery of a piezoelectric resonance layer and suspended above a cavity can prevent transverse waves generated by the piezoelectric resonance layer from being transmitted to the periphery of the cavity, and reflect the transverse waves back to an effective working area, so that sound wave loss is reduced, the quality factor of the resonator is improved, and finally the performance of a device can be improved. Furthermore, the overlapping parts of a bottom electrode overlapping part and the cavity and the overlapping parts of a top electrode overlapping part and the cavity are suspended, and the bottom electrode overlapping part and the top electrode overlapping part are mutually staggered, so that a parasitic parameter can be greatly reduced, the problems of electric leakage, short circuit and the like can be avoided, and the reliability of the device can be improved.

The invention provides a bulk acoustic wave resonator, a manufacturing method thereof, a filter and a radio frequency communication system. A bottom electrode concave part formed on the periphery of apiezoelectric resonance layer and suspended above a cavity can prevent transverse waves generated by the piezoelectric resonance layer from being transmitted to the periphery of the cavity and reflect the transverse waves back to an effective working area, so that the sound wave loss is reduced, the quality factor of the resonator is improved, and finally, the performance of a device can be improved. Furthermore, the overlapping parts of a bottom electrode overlapping part and the cavity and the overlapping parts of a top electrode overlapping part and the cavity are suspended, and the bottomelectrode overlapping part and the top electrode overlapping part are mutually staggered, so that a parasitic parameter can be greatly reduced, the problems of electric leakage, short circuit and thelike can be avoided, and the reliability of the device can be improved.

The invention relates to a high-precision sample rotating table device based on an atomic force microscope. The high-precision sample rotating table device comprises a rotating table body, a sample mounting base located on the rotating table body and a magnetic attraction base used for fixing the rotating table body. The rotating table body is fixed on an atomic force microscope scanner platform through the magnetic attraction base. The rotating table body comprises a sample table, a magnetic rotary encoder and two oval piezoelectric resonance motors. A plastic ring is fixed to the side face of the sample table, the top ends of the oval piezoelectric resonance motors make close contact with the plastic ring, the two oval piezoelectric resonance motors are oppositely installed, one oval piezoelectric resonance motor is used for pushing the plastic ring to move, and the other oval piezoelectric resonance motor is used for pulling the plastic ring to move in the opposite direction. A magnetic disk of the magnetic rotary encoder is arranged on the sample table. The device provided by the invention is suitable for providing high-precision angle rotation for a sample under the conditions of limited size space and limited weight of an atomic force microscope, and widens the application occasion and research range of the atomic force microscope.

The invention relates to a parallel-type three-degree-of-freedom piezoelectric resonance self-actuating mechanism and an excitation method thereof and belongs to the field of piezoelectric driving. The parallel-type three-degree-of-freedom piezoelectric resonance self-actuating mechanism and the excitation method thereof can be applied to the fields of precision driving, medical treatment, micromachinery and the like. The invention aims to solve the problem that an existing three-degree-of-freedom piezoelectric self-actuating device is small in output force, high in cost and insufficient in actuating capacity. The three-degree-of-freedom piezoelectric resonance self-actuating mechanism of the invention is of a transducer parallel structure; the electric resonance self-actuating mechanism comprises four columnar piezoelectric transducers of the same structure and connecting devices of the columnar piezoelectric transducers; and the self-actuating mechanism comprises four driving feet used for combined actuation. According to the excitation method of the self-actuating mechanism, the sequential longitudinal vibration of the four columnar piezoelectric transducers is respectively excited through two-phase or four-phase voltage excitation signals according to a translation or rotation motion mode, so that the combined longitudinal vibration of the four columnar piezoelectric transducers is formed to drive the driving feet to move, and therefore, the three-degree-of-freedom actuating function of the self-actuating mechanism on a working plane is realized.

The invention belongs to the field of fine inorganic chemical material preparation and relates to a preparation method for synthesizing crystalline/amorphous ultrafine zinc oxide (ZnO) powder at high efficiency. The invention improves the method of preparing ZnO by high temperature pyrolysis of Zn(OH)2 based on sol-gel method. In the invention, solid-state zinc salt and sodium bicarbonate are mixed at a given proportion, and then thermal decomposition is carried out at a given temperature to prepare ultrafine ZnO powder. Amorphous/crystalline ZnO can be synthesized according to decomposition temperature. The inventive preparation method for synthesizing crystalline/amorphous ultrafine ZnO powder at high efficiency by solid-phase low-temperature thermal decomposition involves simple equipment, and has simple operation, low cost, and high yield (95% or higher). The prepared crystalline ZnO has a uniform particle size which can be well controlled within 10-50 nm, and the prepared amorphous ZnO has strong ultraviolet emission. The invention can find wide application in electronic, daily chemical, building material, painting and rubber products, and further find wide application in chemical sensors, high-frequency piezoelectric resonant cavities, photocells, ultraviolet light emitting devices, etc., as electronic material, and is an important fine chemical material.

The invention discloses a manufacture method of an optical voltage/electric field sensor wafer capable of suppressing piezoelectric resonance and belongs to the optical voltage/electric field sensor technical field. According to one embodiment of the invention, a value in a set range is selected for the width of the wafer, and therefore, the resonant fundamental frequency of an optical voltage/electric field sensor composed of the wafer can be transferred to be a frequency outside a frequency range required to be measured; according to another embodiment of the invention, the width of the wafer is set to change gradually, so that the resonant energy of the optical voltage/electric field sensor composed of the wafer can be dispersed. The optical voltage/electric field sensor composed of thewafer prepared by the method of the invention effectively suppresses a piezoelectric resonance phenomenon under a condition of a set electric field frequency. The method is simple in operation and easy to implement.

While suppressing that a vibration of a piezo-electric element propagates to a substrate by devising the composition of an electro-conductive support body, the piezoelectric resonant component which secures electroconductivity and can maintain a fall-proof shock property is provided. The piezoelectric resonant component has a substrate 20 on the top surface of which pattern electrodes 21 and 22 are formed, and on the lower surface of which it has electrodes 8 and 9. It has a piezoelectric element 1 using the length vibration on the substrate 20. Electro-conductive support bodies 10 and 11 are fixed to the length direction center section of the lower surface electrodes of the piezoelectric element 1. The connection fixation of these support bodies 10 and 11 to the pattern electrodes 21 and 22 of the substrate 20 is performed by electro-conductive adhesives 12 and 13. The electro-conductive support bodies 10 and 11 include an urethane resin which contains an electro-conductive filler, making the rate of content of the electro-conductive filler 75-85 wt %.

A method of adjusting a frequency of an energy-trap type piezoelectric resonance element includes the steps of preparing a piezoelectric resonance element including first and second vibration electrodes formed partially on both of the main surfaces of a piezoelectric plate, the thickness of the first vibration electrode being larger than that of the second vibration electrode, and modifying the first vibration electrode or the second vibration electrode in such a manner that the thicknesses of the first and second vibration electrode electrodes are substantially equal to each other such that the piezoelectric resonance element has a desired frequency.