36 results about "Piezoelectric speaker" patented technology

A piezoelectric speaker includes a diaphragm and a piezoelectric layer disposed over the diaphragm. The thickness of the piezoelectric layer may be in the range of 20 microns to 120 microns. A width of the piezoelectric layer may be 50 mm or more, and a length of the piezoelectric layer may be 100 mm or more. The piezoelectric layer may also include a pair of electrodes in electrical contact with the piezoelectric layer and configured to drive the piezoelectric layer. A method of manufacturing a piezoelectric speaker includes attaching a single piezoelectric layer and a pair of electrodes to a diaphragm using an adhesive.

The invention discloses a voice interaction method and system based on an intelligent doll, and relates to the technical field of intelligent acoustic interaction, and the method comprises the steps: carrying out the time-frequency analysis processing of a vibration feature matrix, and generating a modal parameter set of vocal cord vibration through biomechanical modeling in combination with the human neck tissue density features; inputting the modal parameter set of vocal cord vibration into the vibration-acoustic model to generate a sound source excitation field, performing environmental noise compensation on the sound source excitation field by using the acoustic characteristic matrix, and generating a time domain pure voice signal through an acoustic wave equation; and collecting real-time position coordinates of the user, calculating and driving a piezoelectric loudspeaker array of the intelligent doll to adjust the phase according to the frequency spectrum characteristics of the time domain pure voice signal, forming a directional focusing sound field, recording user physiological feedback, and generating a user physiological feedback matrix. According to the method, the vocal cord displacement modal function vector is solved through the nonlinear integral and augmented Lagrange algorithm, so that the acquisition precision and the anti-noise capability of the voice signal are improved from the source.

The invention discloses a fixed end beam-cantilever beam type piezoelectric MEMS loudspeaker and a preparation method and application thereof. The piezoelectric MEMS loudspeaker comprises a substrate, an upper electrode, a piezoelectric layer, a lower electrode and a vibrating membrane, the upper electrode, the piezoelectric layer and the lower electrode are sequentially arranged on the substrate, and the vibrating membrane and an etching gap surrounding the vibrating membrane are formed on the upper electrode, the piezoelectric layer and the lower electrode in an etching mode; the vibration displacement of the fixed end beam-cantilever beam type piezoelectric MEMS loudspeaker is very large, and is mainly attributed to the superposition of the vibration displacement of the fixed end beam and the vibration displacement of the cantilever beam.

The invention discloses a piezoelectric MEMS loudspeaker based on a folding ring between movable and fixed parts and application thereof, and belongs to the technical field of loudspeakers, the piezoelectric MEMS loudspeaker comprises a piezoelectric actuating assembly, a fixed assembly and a folding ring; the piezoelectric actuating assembly comprises a piezoelectric actuating composite layer, the piezoelectric actuating composite layer at least comprises a piezoelectric material layer, and the piezoelectric actuating composite layer generates mechanical displacement by applying voltage to drive the piezoelectric actuating assembly to vibrate so as to generate sound pressure; the fixing component can be a single structural component or a component with a plurality of structural components; the fixing assembly can be used for fixedly supporting the fixed supporting part of the piezoelectric actuating assembly, so that the non-fixed supporting part of the piezoelectric actuating assembly can freely move or vibrate; according to the invention, through the innovative design based on the folding ring between the moving part and the fixed part, the low-frequency vibration displacement of the vibrating diaphragm is remarkably improved, the problem that the low-frequency sound pressure of a traditional piezoelectric MEMS loudspeaker is insufficient is effectively solved, and the vibrating diaphragm can push air with a larger volume in a low-frequency band, so that a fuller low-frequency sound effect is obtained.

A signal transmission device, an electronic device, a method for reversibly connecting an electronic device, and a method for changing different devices are proposed, in which, in particular, a conducted (e.g., wired) loudspeaker, especially a piezo loudspeaker (2), which is attached to the eardrum (3) and excites it to vibrate, is used, wherein the ear canal (4) generally remains open and the natural acoustic transparency of the outer ear is maintained, since the signal transmission from the electronic device to the loudspeaker and the necessary otoplastic measures are generally placed at least partially outside the ear canal (4).

A piezoelectric MEMS loudspeaker. The application discloses a MEMS structure, comprising: a substrate comprising an inner ring body and an outer ring body connected by a connecting rod, having a first cavity between the inner ring body and the outer ring body, and having a second cavity in the inner ring body; a piezoelectric composite vibration layer formed above the substrate, comprising an edge portion formed above the outer ring body and a center portion formed above the inner ring body, having a partition gap between the edge portion and the center portion. In summary, the piezoelectric MEMS loudspeaker provided by the application comprises an edge portion and a center portion, wherein the edge portion is used to generate a high-frequency sound pressure level, and the center portion is used to generate a low-frequency sound pressure level. The combination of the edge portion and the center portion makes the piezoelectric MEMS loudspeaker have a relatively flat sound pressure level frequency response curve with a wider range, thereby improving the auditory effect in the entire frequency band.

This application provides an audio processing method, an electronic device, and a computer-readable medium. The method includes detecting that a first frequency of a first audio signal to be processed belongs to a first frequency range; adjusting the amplitude of the first audio signal based on a first target amplitude corresponding to the first frequency to obtain a second audio signal; and providing the second audio signal to a piezoelectric loudspeaker to drive the piezoelectric loudspeaker to emit sound, wherein the current generated by the second audio signal input to the piezoelectric loudspeaker is lower than the critical current of overcurrent protection. This application can prevent the operating circuit of the piezoelectric loudspeaker from triggering overcurrent protection due to playing high-frequency audio signals.

The application discloses a piezoelectric MEMS loudspeaker and a performance improvement method thereof, and belongs to the field of MEMS loudspeakers. The application first proposes a cantilever beam structure with a fixed support end perforation, and the structure can change the resonant frequency of the device. Further, based on the structure, the piezoelectric MEMS loudspeaker proposed in the application is composed of a plurality of triangular cantilever beams with different fixed support end perforations. Since the displacement of the triangular cantilever beam at the resonant frequency will be phase-inverted, the driving voltages of various triangular cantilever beams at both sides of the respective resonant frequencies should be opposite. Through the optimization design of the cantilever beam structure, compared with the traditional piezoelectric MEMS loudspeaker, the application can improve the sound pressure level output at the design frequency band without additional process difficulty, make the sound pressure level spectrum curve in the human ear hearing threshold frequency band relatively flat, realize compact layout, and has a good application prospect.

The invention discloses a nested array piezoelectric MEMS loudspeaker, which is formed by arranging, nesting and combining a plurality of piezoelectric MEMS loudspeaker units together, a unit vibrating diaphragm is composed of a central vibrating diaphragm and extended rectangular vibrating diaphragms, the four edges of the central vibrating diaphragm are respectively provided with one extended rectangular vibrating diaphragm, the outer edges of the extended rectangular vibrating diaphragms are connected with a supporting base, and the supporting base is connected with the piezoelectric MEMS loudspeaker units. The actuator units are mutually nested and arranged through partially extending diaphragm structures, and in order to avoid crosstalk, the actuator units are mutually isolated through supporting substrates and air gaps. The array actuator has the beneficial effects that the actuator unit adopts a cross-shaped vibrating diaphragm design, so that the effective vibration area and out-of-plane displacement are improved, and the sound pressure level output of each part of array actuator unit under the fixed substrate size is improved; by modulating the difference of excitation signal phases of each part of array units under different voltages and different frequencies and coordinating with the vibration synthesis design realized by combining the array units, the programmable application requirements of the enhanced hearing aid can be met.

The present invention relates to a piezoelectric speaker. A piezoelectric speaker (10) has a piezoelectric film (35), a first bonding layer (51), and an intermediate layer (40). The piezoelectric film (35) includes a first electrode (61), a second electrode (62), and a piezoelectric body (30) sandwiched between the first electrode (61) and the second electrode (62). The first bonding layer (51) is an adhesive or cohesive layer. The intermediate layer (40) is disposed between the piezoelectric film (35) and the first bonding layer (51). The entire main surface of both main surfaces of the piezoelectric film (35) vibrates up and down.

A flexible electronic device includes: a sensor; a flexible display; a piezoelectric speaker including N piezoelectric films attached to the flexible display; and a processor configured to: detect a change of a state of the flexible display through the sensor; based on the change of the state of the flexible display, determine locations of a number of piezoelectric films through which sound is to be output, among the N piezoelectric films; and output sound through the number of piezoelectric films by controlling the piezoelectric films to be activated, based on the determined locations of the number of piezoelectric films.

The invention discloses a three-drive ultrathin broadband piezoelectric loudspeaker, and the loudspeaker comprises a voice diaphragm vibration system which comprises a steel sheet; the first piezoelectric ceramic piece is attached to the steel piece; the first coupling piece is provided with a first bonding end and a first connecting end which are opposite, and the first bonding end is bonded with the steel sheet; the second coupling piece is provided with a second bonding end and a second connecting end which are opposite, and the second bonding end is bonded with the steel sheet; the first FPC flat cable is connected with the first piezoelectric ceramic piece; the second piezoelectric ceramic piece is connected with the first connecting end; the third piezoelectric ceramic piece is connected with the second connecting end; the second FPC flat cable is connected with the second piezoelectric ceramic piece; the third FPC flat cable is connected with the third piezoelectric ceramic piece; the loudspeaker frame is provided with a mounting cavity, and the voice diaphragm vibration system is arranged in the mounting cavity; and the dual suspension system is arranged on the loudspeaker frame and is provided with a first vibration cantilever and a second vibration cantilever which are respectively connected with the first vibration cantilever and the second vibration cantilever.

This application relates to the field of semiconductor technology, specifically to a MEMS piezoelectric loudspeaker and acoustic device, including a substrate and a piezoelectric stack disposed on the substrate; the piezoelectric stack has multiple tangents extending from the geometric center of the piezoelectric stack to the edge of the piezoelectric stack, forming multiple cantilever beams arranged rotationally symmetrically about the geometric center; each cantilever beam has a fixed edge away from the geometric center; at least two of the cantilever beams have trench structures on the substrate, the trench structures being located close to the fixed edge of the cantilever beam. This application can reduce peaks at resonant frequencies and effectively expand the frequency bandwidth, improving overall audio performance; in addition, this application can also reduce diaphragm stiffness, thereby significantly enhancing its low-frequency deformation capability and optimizing the low-frequency sound pressure level curve.

The application discloses a voice interaction method and system based on an intelligent doll, relates to the technical field of intelligent acoustic interaction, and comprises the following steps: performing time-frequency analysis and processing on a vibration feature matrix, combining with the density characteristics of human neck tissues, and generating a modal parameter set of vocal cord vibration through biomechanical modeling; inputting the modal parameter set of vocal cord vibration into a vibration-acoustic model to generate a sound source excitation field, compensating the sound source excitation field for environmental noise by using an acoustic feature matrix, and generating a time-domain pure speech signal through a sound wave equation; collecting real-time position coordinates of a user, calculating and driving a piezoelectric loudspeaker array of the intelligent doll to adjust a phase according to the spectral characteristics of the time-domain pure speech signal, forming a directional focused sound field, recording physiological feedback of the user, and generating a user physiological feedback matrix. The application solves a vocal cord displacement modal function vector by using a nonlinear integral and an augmented Lagrange algorithm, so that the collection accuracy and the noise resistance of a speech signal are improved at the source.

The present invention provides a polymer-based piezoelectric composite material from which a piezoelectric film capable of outputting a higher sound pressure is obtained in a case of using a piezoelectric speaker, a piezoelectric film formed of the polymer-based piezoelectric composite material, and a piezoelectric speaker and a flexible display which are formed of the piezoelectric film. The polymer-based piezoelectric composite material of the present invention is a polymer-based piezoelectric composite material including a polymer matrix which contains a polymer containing a group represented by Formula (1), and piezoelectric particles.*-L1-CR1R2—CN  Formula (1)In Formula (1), L1 represents a divalent linking group excluding a divalent aliphatic hydrocarbon group. R1 and R2 each independently represent a hydrogen atom, an alkyl group, or an aryl group.

To reproduce a wide frequency band at a high sound pressure.SOLUTION: A piezoelectric sounder 10 of the present disclosure includes a plate-shaped piezoelectric ceramic 20 having one surface and the other surface, a metal plate 30 having an inner peripheral part 31 bonded to one surface of the piezoelectric ceramic 20 and an outer peripheral part 32 located on the outer peripheral side of the inner peripheral part 31, a vibration plate 40 having a covering part 43 covering the metal plate 30 from the side opposite to the piezoelectric ceramic 20 in which an opening edge part 42 of an opening 41 of the covering part 43 that opens toward the metal plate 30 extends toward the outer peripheral part 32 and a part of the covering part 43 is bonded to the metal plate 30, and a fixing part 50 that fixes the other surface of the piezoelectric ceramic 20. According to such a configuration, a diaphragm 40 can be driven by the outer peripheral part 32 of the metal plate 30. Since the diaphragm 40 is driven by bending of the metal plate 30 and the change in a radial direction, a sound in a wide band can be generated with a high sound pressure. In addition to characteristics of the piezoelectric sounder 10 itself, arbitrary acoustic characteristics can be obtained depending on the material and shape of the diaphragm 40.SELECTED DRAWING: Figure 2

The utility model relates to the field of medical equipment, and provides a head coil and a nuclear magnetic resonance spectrometer, the head coil comprises a housing, a coil assembly and a piezoelectric loudspeaker, the housing comprises an accommodating area used for placing the head of a human body; the coil assembly is arranged in the shell; the piezoelectric loudspeaker is arranged in the shell; wherein the shell is provided with a vibration part, and the piezoelectric loudspeaker is attached to the vibration part so as to transmit sound waves through the vibration part. The piezoelectric loudspeaker is directly integrated in the head coil, so that a patient can receive a voice instruction of an operator without additionally wearing an earphone, meanwhile, the vibration part on the shell is used for transmitting sound, and the shape of the original head coil of the nuclear magnetic resonance spectrometer can be kept unchanged without opening a hole in the shell and adding other parts.

The invention discloses a piezoelectric device and a piezoelectric loudspeaker. The piezoelectric device comprises a piezoelectric lamination unit and a supporting unit. The piezoelectric lamination unit comprises an electrode lamination branch, a damping adjustment branch and at least one slit, the damping adjustment branch is located on one side of the electrode lamination branch, and the slit penetrates through the electrode lamination branch and the damping adjustment branch; the electrode lamination subsection comprises a first electrode layer, a piezoelectric layer and a second electrode layer; the damping adjusting part comprises at least two first damping adjusting layers and at least one second damping adjusting layer, and the first damping adjusting layers and the second damping adjusting layers are arranged in the first direction; the damping ratio of the first damping adjusting layer is larger than that of the second damping adjusting layer. The supporting unit is located on the side, away from the piezoelectric lamination unit, of the electrode lamination branch part. The supporting unit comprises a supporting branch part and a cavity. The support subsections surround the cavity. By adjusting the damping adjusting subsection, the internal energy dissipation of the whole structure can be improved, and the quality factor of the piezoelectric device is effectively reduced.

The invention discloses a piezoelectric loudspeaker, and the loudspeaker comprises a substrate which is provided with a back cavity in a penetrating manner; the supporting unit is arranged on the substrate and covers the back cavity, a first slit is formed in the supporting unit in a penetrating mode so that the supporting unit can be divided into a first supporting part and a second supporting part, the second supporting part is located in the peripheral direction of the first supporting part and is located in the vibration direction of the piezoelectric loudspeaker, and the first supporting part protrudes towards the back cavity side compared with the second supporting part; the piezoelectric unit is arranged on the supporting unit, a second slit is formed in one part of the piezoelectric unit in a penetrating mode so as to divide the piezoelectric unit into a first piezoelectric part and a second piezoelectric part, the second piezoelectric part is located in the outer circumferential direction of the first piezoelectric part, the first piezoelectric part is supported on the first supporting part, the second piezoelectric part is supported on the second supporting part, and the second piezoelectric part is located in the vibration direction. The first piezoelectric part protrudes more towards the back cavity side than the second piezoelectric part; and the additional film layer is arranged on the piezoelectric unit and is also formed at a position corresponding to the second slit.

The present disclosure belongs to the technical field of sound-generating devices. Provided is a piezoelectric speaker. The piezoelectric speaker includes a support frame, a circuit assembly, a first diaphragm assembly, a second diaphragm assembly, and a vibration assembly. The periphery of the first diaphragm assembly is fixedly connected to the support frame. The periphery of the second diaphragm assembly is fixedly connected to the support frame. The vibration assembly is disposed in the cavity and located between the first diaphragm assembly and the second diaphragm assembly. The vibration assembly includes a first piezoelectric structure and a second piezoelectric structure that are disposed on the same layer on the support frame. The first piezoelectric structure is fixedly connected to the first diaphragm assembly and is configured to drive the first diaphragm assembly to vibrate in the first direction.

This invention provides a piezoelectric speaker that produces sound by vibrating a diaphragm using a piezoelectric actuator, and which is easy to fix to a support. [Solution] The piezoelectric speaker 10 includes a flexible piezoelectric actuator 35, a diaphragm 41, a fixed surface 17, and an intervening layer 42. The diaphragm 41 is vibrated by the flexible piezoelectric actuator 35. The fixed surface 17 is a surface to be fixed to the support 80. The intervening layer 42 is positioned between the diaphragm 41 and the fixed surface 17. When the diaphragm 41 is observed in a plan view, the fixed surface 17 is present in an area of ​​50% to 100% of the area of ​​the diaphragm 41.

The invention discloses a piezoelectric loudspeaker and a preparation method thereof, and belongs to the technical field of semiconductors. The piezoelectric loudspeaker comprises a piezoelectric structure which comprises a first electrode, a piezoelectric layer, a second electrode and a flexible substrate which are stacked; wherein the piezoelectric structure comprises a bottom section and a side wall section which are enclosed to form a cavity; the first electrode, the piezoelectric layer, the second electrode and the flexible substrate in the bottom section and the side wall section are sequentially arranged in the direction away from the cavity, and the first electrode of the bottom section is electrically connected with the first electrode of the side wall section. The first electrode of the bottom section is electrically connected with the second electrode of the side wall section. The vibration amplitude of the film can be greatly increased, the sound pressure level under low-frequency response is improved, and low-frequency distortion is reduced.

This application discloses a piezoelectric MEMS loudspeaker, comprising: a substrate having a cavity; a vibration support layer formed above the substrate and covering the cavity; a first electrode layer formed above the vibration support layer; a piezoelectric layer formed above the first electrode layer; and a second electrode layer formed above the piezoelectric layer. A first groove extends from the upper surface of the second electrode layer to the upper surface of the vibration support layer and exposes the vibration support layer. The exposed vibration support layer has a second groove extending from the upper surface of the vibration support layer to the lower surface of the vibration support layer. The piezoelectric MEMS loudspeaker structure provided in this application is divided into two parts: an edge portion of a tweeter and a center portion of a woofer, and a hollowed-out vibration support layer connecting the two, thereby improving the auditory effect across the entire frequency range.

The invention relates to the technical field of semiconductor devices, in particular to a damping control structure, a piezoelectric loudspeaker and a preparation method, and the damping control structure comprises a supporting part and a damping layer; one end of the supporting piece is arranged on a substrate of the piezoelectric loudspeaker, and the damping layer is arranged at the other end of the supporting piece; a damping hole is formed in the damping layer; the damping layer comprises a first electrode, a piezoelectric layer and a second electrode which are arranged in a stacked mode, and the first electrode and the second electrode apply voltage to the piezoelectric layer so as to adjust the opening size of the damping hole in the piezoelectric layer. According to the invention, the adjustment of acoustic damping can be realized, so that the device can adapt to the acoustic requirements of different frequency ranges, and the sound quality performance of the piezoelectric loudspeaker is effectively improved.

This invention provides a piezoelectric speaker that produces sound by vibrating a diaphragm using a piezoelectric actuator, and which has good low-frequency characteristics. [Solution] The piezoelectric speaker 10 includes a flexible piezoelectric actuator 35, a diaphragm 41, a fixed surface 17, and an intervening layer 42. The diaphragm 41 is vibrated by the flexible piezoelectric actuator 35. The fixed surface 17 is a surface to be fixed to the support 80. The intervening layer 42 is positioned between the diaphragm 41 and the fixed surface 17. The bending coefficient of the diaphragm 41 is 100 [kg / (GPa·mm·m 3 The coefficient of inflection, which is greater than or equal to ), is a value obtained by dividing the density of the diaphragm 41 by the product of the Young's modulus of the diaphragm 41 and the thickness of the diaphragm 41.

A piezoelectric speaker is provided that optimizes the stress of each layer during displacement, increases the displacement of an additional film layer, and effectively improves the sound pressure level. [Solution] The piezoelectric speaker includes a substrate (10) through which a back cavity (11) is formed, a support unit (20) provided on the substrate and covering the back cavity, a piezoelectric unit (30) provided on the support unit, and an additional film layer (40) provided on the piezoelectric unit. A first slit (23) is formed through the support unit, dividing the support unit into a first support portion (201) and a second support portion (202) located around the periphery of the first support portion. In the vibration direction of the piezoelectric speaker, the first support portion protrudes further toward the back cavity than the second support portion. A second slit (34) is formed through a portion of the piezoelectric unit, and the first piezoelectric portion (301) is supported by the first support portion and protrudes further toward the back cavity than the second piezoelectric portion in the vibration direction, and the second piezoelectric portion (302) is located around the periphery of the first piezoelectric portion and supported by the second support portion.

The application provides a MEMS piezoelectric loudspeaker, which comprises a substrate with a cavity; a vibrating structure comprising a structure layer, a piezoelectric composite layer and a flexible layer; the structure layer comprises a structure plate, a structure fixing part and a plurality of structure springs with slits; the piezoelectric composite layer comprises a piezoelectric film and a first electrode layer and a second electrode layer; wherein the mutually coinciding areas of the piezoelectric film, the first electrode layer and the second electrode layer in the orthographic projection of the substrate are piezoelectric driving functional areas, and the flexible layer is arranged in the stacking direction of the layers of the vibrating structure and is spaced apart from the structure layer and its orthographic projection completely covers the slits of the plurality of structure springs. The stress of the piezoelectric composite layer can be released through the elastic effect of the structure springs, the rigidity of the overall structure is ensured and the rigidity of the overall structure is not too low, so that the sound pressure level of the MEMS piezoelectric loudspeaker is improved and the harmonic distortion is reduced, and the performance of the MEMS piezoelectric loudspeaker is improved.

This document describes improved driving circuits for piezoelectric speakers (piezos). In aspects, a charging case for a hearable device includes a piezo and a circuit for driving the piezo having a battery, an inductor, first and second switches, and a microcontroller. The microcontroller is configured to first toggle the first switch for a number of times to charge the piezoelectric speaker via the inductor to a target voltage level and second toggle the second switch to discharge and thus sound the piezo. In such aspects, the first toggling of the first switch and the second toggling of the second switch control a volume and frequency, respectively, of the sounding, improving audio quality and providing finder features to users. Further, charging the piezoelectric speaker via the inductor enables the inductor to be smaller, conserving space within and power consumption of the charging case, leading to improved battery life.

A quasi-closed octagonal piezoelectric MEMS loudspeaker disclosed by the present invention comprises a supporting substrate, an octagonal vibrating diaphragm, fixed edges and a vibrating cavity, the octagonal vibrating diaphragm is an octagon formed by chamfering four corners of a rectangular vibrating diaphragm, four short edges formed by the chamfers are the fixed edges, and the other four long edges of the edge of the supporting substrate are the free edges. The fixed edge is fixedly connected with the support substrate, and the octagonal diaphragm is located in the upper end plane of the support substrate. According to the design, by reducing the connecting area range of the vibrating diaphragm and the peripheral supporting substrate and increasing the size range between connecting boundaries, boundary constraint is reduced, the average distance between each area in the vibrating diaphragm and the boundary constraint area is increased, and the out-of-plane displacement of the vibrating diaphragm under a low-frequency driving signal can be improved; by adopting a driving mode that the inner and outer ring electrodes have a 180-degree phase difference, the purposes of improving the vibration mode of the vibrating diaphragm and increasing the effective vibration area are achieved; therefore, low-frequency sound pressure level output can be improved, and finally higher full-band sound pressure level output is realized.