380 results about "Acoustic cavity" patented technology

The utility model discloses a sound production device and a sound production module, the sound production device comprises a shell, a magnetic circuit system and a vibration system, and the shell is provided with a first sound outlet hole; the vibration system comprises a first vibrating diaphragm, a second vibrating diaphragm, a middle diaphragm and a voice coil, the first vibrating diaphragm is arranged on one side, far away from the magnetic circuit system, of the shell, the second vibrating diaphragm is arranged on one side, facing the magnetic circuit system, of the first vibrating diaphragm, and the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm; the voice coil is at least partially arranged in the magnetic gap of the magnetic circuit system, and the middle diaphragm and the second diaphragm are located outside the voice coil; the outer edges of the second vibrating diaphragm and the middle diaphragm are connected with the shell, and the inner edges of the second vibrating diaphragm and the middle diaphragm are connected with the first vibrating plate of the first vibrating diaphragm; a second sound production cavity communicated with the first sound production hole is formed between the second vibrating diaphragm and the middle diaphragm; a first rear cavity is defined by the first vibrating diaphragm and the middle diaphragm, and a second rear cavity communicated with the first rear cavity is defined by the first vibrating diaphragm, the second vibrating diaphragm and the shell.

The utility model discloses a sound production device, a sound production module and electronic equipment, the sound production device comprises a shell, a magnetic circuit system and a vibration system, the shell is provided with an accommodating space, and the shell is provided with a first sound outlet hole; the magnetic circuit system is arranged in the accommodating space and is provided with a magnetic gap; the vibration system comprises a first vibrating diaphragm, a second vibrating diaphragm, a middle diaphragm and a voice coil, the first vibrating diaphragm is arranged on one side, far away from the magnetic circuit system, of the shell, the second vibrating diaphragm is arranged on one side, facing the magnetic circuit system, of the first vibrating diaphragm, and the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm; the voice coil is at least partially arranged in the magnetic gap, the voice coil is connected with the first diaphragm, and the second diaphragm and the middle diaphragm are located on the outer side of the voice coil; the outer edges of the second vibrating diaphragm and the middle diaphragm are connected with the shell, and the inner edges of the second vibrating diaphragm and the middle diaphragm are connected with the first vibrating diaphragm; and a closed second sound production cavity is formed between the second vibrating diaphragm and the middle diaphragm and is communicated with the first sound outlet hole.

The utility model discloses a sound production device and a sound production module, the sound production device comprises a shell, a magnetic circuit system and a vibration system, the shell is provided with a first sound outlet hole, and the shell comprises a first shell and a second shell; the magnetic circuit system is fixed on the second shell and is provided with a magnetic gap; the vibration system comprises a first vibrating diaphragm, a second vibrating diaphragm, a middle diaphragm and a voice coil, the first vibrating diaphragm is arranged on one side, far away from the magnetic circuit system, of the shell, and the outer edge of the first vibrating diaphragm is fixed on the first shell; the second vibrating diaphragm is arranged on one side, facing the magnetic circuit system, of the first vibrating diaphragm, and the outer edge of the second vibrating diaphragm is clamped between the first shell and the second shell; the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm, and the outer edge of the middle diaphragm is connected with the first shell; the voice coil is at least partially arranged in the magnetic gap; the inner edges of the second vibrating diaphragm and the middle diaphragm are connected with the first vibrating diaphragm; and a closed second sound production cavity is formed between the second vibrating diaphragm and the middle diaphragm and is communicated with the first sound outlet hole.

The invention discloses an earthquake early warning device and method based on campus broadcast, and the method comprises the steps: carrying out the building response coupling analysis through receiving an early warning signal of an earthquake monitoring center, generating an earthquake magnitude-building coupling feature, and mapping the earthquake magnitude-building coupling feature into an enhanced early warning source adaptive to an acoustic environment; acoustic cavity detection is carried out based on threatened area identification, and differential playing topology is constructed; extracting a high-risk gathering area through personnel density scanning, generating personalized evacuation guiding content and determining a playing priority; high-precision time sequence control is realized by adopting a synchronous reference anchor point technology, and a multi-mode playing domain is constructed through carrier modulation and frequency division multiplexing; and finally, an acoustic navigation field is utilized to guide accurate scheduling and playing of audio signals, differential playing and accurate coverage of early warning information can be realized according to the anti-seismic characteristics and acoustic environment characteristics of different buildings, and an intelligent acoustic solution is provided for campus earthquake early warning.

The utility model discloses a sounding device, a sounding module and an electronic device, and relates to the technical field of electroacoustic transduction, a central magnetic part of a magnetic circuit system of the sounding device comprises a first central magnet, a central magnetic conductive plate and a second central magnet which are stacked, and the inner side of an inner folding ring of a first diaphragm assembly of a vibration system is connected with the central magnetic part. The outer periphery of the outer folding ring is connected with the shell, the diaphragm and the second diaphragm assembly are sequentially arranged on the side, facing the magnetic conductive yoke, of the first diaphragm assembly, the outer edges of the diaphragm and the second diaphragm assembly are both connected with the shell, and the inner edge of the diaphragm is connected with the inner edge of the second diaphragm assembly. And the rigid connecting piece is connected with the second vibrating diaphragm assembly, and the other end of the rigid connecting piece is connected with the voice coil, so that the voice coil drives the second vibrating diaphragm assembly to vibrate through the rigid connecting piece. According to the sounding device, the effective vibration area of a vibration system is increased, and the acoustic performance is improved.

The application relates to the technical field of terminals, and discloses an electronic device and a cover. The electronic device comprises a cover, a display screen assembly and a main body. The cover is used for shielding a gap between the display screen assembly and the main body. The cover comprises a first part and a second part which are connected. The first part covers at least part of the edge of the display screen assembly. The second part extends from the first part towards the main body. The inside of the main body comprises an acoustic cavity, and the cover and / or the main body is provided with an acoustic outlet channel which is connected to the acoustic cavity and the outside of the mobile phone. The acoustic outlet of the acoustic outlet channel has an area greater than 0 in the region of the orthographic projection of the side projection plane. The side projection plane is perpendicular to the plane in which the display screen assembly is located and parallel to the edge of the display screen assembly corresponding to the acoustic outlet channel. The electronic device described above cannot be observed from the front, the acoustic outlet channel and the internal components cannot be observed, the appearance is improved, meanwhile, the size space of the display screen assembly can be increased, and the space utilization rate of the electronic device is improved.

A loudspeaker includes a housing having a plurality of walls that together define an acoustic cavity. An electro-acoustic transducer is mounted to a front wall of the housing, and an axis of motion of the electro-acoustic transducer is offset from a centroid of the front wall. The loudspeaker is configured to be stacked with another loudspeaker having the same configuration in a first configuration such that the stacked loudspeakers radiate acoustic energy to produce an omnidirectional radiation pattern; and the loudspeaker is configured to be stacked with the other loudspeaker in a second configuration such that the stacked loudspeakers radiate acoustic energy to produce a cardioid radiation pattern. The loudspeaker includes a keying feature that does not interlock and thereby prevent stacking when the loudspeaker is in a first orientation relative to the other loudspeaker, and that interlocks to allow stacking when the loudspeaker is in a second orientation relative to the other loudspeaker.

The utility model discloses a sounding device and a sounding module, and relates to the technical field of electroacoustic transduction, the inner side of an inner folding ring of a first vibrating diaphragm assembly of the sounding device is connected with a central magnetic part, and a diaphragm and a second vibrating diaphragm assembly are sequentially arranged on one side, facing a magnetic conductive yoke, of the first vibrating diaphragm assembly; the diaphragm is arranged in the shell, a sound production cavity communicated with a sound production hole of the shell is formed between the diaphragm and the second diaphragm assembly, the diaphragm is a flexible piece, and the two ends of the rigid connecting piece are connected with the second diaphragm assembly and the voice coil respectively, so that the voice coil drives the second diaphragm assembly to vibrate through the rigid connecting piece; the outer periphery of the outer folding ring and the outer periphery of the diaphragm are both connected with the first shell, the magnetic conductive yoke is connected with the second shell, and the outer periphery of the second diaphragm assembly is clamped between the first shell and the second shell. According to the sounding device, the effective vibration area of a vibration system is increased, and the acoustic performance is improved.

The application relates to the technical field of human-computer interaction, in particular to a pressure input key based on a microphone and a method, which comprises a microphone, a sound transmission hole, a pressure sensing structure and a processing unit; the microphone is integrated in the interior of an electronic device; the sound transmission hole is arranged on the shell of the electronic device and is in communication with the microphone to form an acoustic channel; the pressure sensing structure is a ring structure arranged around the sound transmission hole, and the pressure sensing structure is provided with at least one gap to form a neck part connecting the sound transmission hole and the atmosphere; the processing unit is integrated in the interior of the electronic device and is in communication connection with the microphone. Compared with the prior art, the application solves the problem that an additional pressure sensor / capacitance sensor needs to be added to measure the pressing level in the prior art. According to the scheme, a micro variable sound cavity capable of changing with the contact and pressing degree of a finger is constructed at the microphone, the correlation between the acoustic signal and the pressing form is established, and thus the pressing level can be calculated by monitoring the acoustic signal collected by the microphone.

Vibration sensors are provided. The vibration sensor may include: a vibration assembly, the vibration assembly including a mass element and an elastic element, and the mass element being connected to the elastic element; a first acoustic cavity, the elastic element constituting one of sidewalls of the first acoustic cavity, and the vibration assembly vibrating to make a volume of the first acoustic cavity change in response to an external vibration signal; an acoustic transducer, the acoustic transducer being in communication with the first acoustic cavity and the acoustic transducer generating an electrical signal in response to a volume change of the first acoustic cavity; and a buffer, the buffer limiting a vibration amplitude of the vibration assembly, wherein the acoustic transducer has a first resonance frequency, the vibration assembly has a second resonance frequency, and the second resonance frequency of the vibration assembly is smaller than the first resonance frequency.

Provided is a speaker, including: a diaphragm structure including first and second diaphragms, the first diaphragm is configured to push air to vibrate to generate initial sound wave, and a signal of which is modulated based on a signal within an audible sound frequency band; and a cover plate structure enclosing with the diaphragm structure to form sound-generating cavity, the cover plate structure has a sound outlet hole connecting the sound-generating cavity with outside, the initial sound wave in the sound-generating cavity is transmitted to the outside through the at least one sound outlet hole to form a sound signal, the second diaphragm and the cover plate structure generate an acoustic environmental impedance used to modulate the initial sound wave to change sound pressure of the sound signal. The speaker can modulate and output a sound signal covering the audible sound frequency band based on the acoustic environmental impedance.

The application relates to the fields of quantum architecture design, quantum dots and phononic crystals, and particularly relates to a carbon nanotube quantum dot regulating device and method based on a sound cavity, wherein the device comprises a phononic cavity, a gate electrode, a metal coating, a carbon nanotube and a groove; the regulating method regulates a quantum bit through the coupling of the phononic cavity and the quantum dot from an external input signal, stores a quantum state by using cat state coding in the phononic cavity, improves the reliability of information storage, prolongs the retention time of quantum information, enhances the stability of regulation and reduces errors in the regulation. The design significantly reduces the size of a single quantum bit to micron level, thereby laying a foundation for realizing the chip integration of millions of quantum bits. The design based on the sound cavity not only improves the density and scalability of quantum bits in quantum computing, but also provides a new idea for the development of future large-scale quantum computing by introducing the efficient regulation of the phononic cavity on the quantum dot.

The present disclosure provides a microphone comprising: an acoustoelectric transducer configured to convert an sound signal to an electrical signal; an acoustic structure, the acoustic structure comprising a sound guiding tube and an acoustic cavity, the acoustic cavity being acoustically communicated with the acoustoelectric transducer and acoustically communicated with the outside of the microphone through the sound guiding tube; wherein the acoustic structure has a first resonant frequency, the acoustoelectric transducer has a second resonant frequency, and an absolute value of the difference between the first resonant frequency and the second resonant frequency is not greater than 1000 Hz.

The utility model discloses a sound box with a damping air cavity, which comprises a main box body, a main acoustic cavity is arranged in the main box body, a loudspeaker is mounted on the side wall of the main box body, one side of the loudspeaker is communicated with the main acoustic cavity, and the other side of the loudspeaker is communicated with an external space; a damping air cavity is formed in the main box body, the damping air cavity is separated from the main acoustic cavity through a partition wall, an air leakage hole is formed in the partition wall, and the air leakage hole is communicated with the main acoustic cavity and the damping air cavity; the side wall of the main box body is provided with an inverter tube, one end of the inverter tube extends into the main acoustic cavity, the other end of the inverter tube is communicated with the external space, and the end, extending into the main acoustic cavity, of the inverter tube is arranged at the position corresponding to the air leakage hole. According to the utility model, the sound quality effect of the sound box can be improved, the low-frequency performance of the sound box is cleaner and more compact, and sound cracking and sound distortion are reduced.

The application provides an electromagnetic acoustic module, a lead frame structure and a manufacturing method, relates to the technical field of microelectronic devices, and the electromagnetic acoustic module comprises a packaging base, a lead frame embedded in the packaging base, a chip arranged on a chip bearing part, a coil support and a coil arranged on a first surface, a magnetic circuit system and a vibration system arranged on a side of the coil support away from the packaging base, and an upper cover surrounding the packaging base to form an acoustic cavity. The chip bearing part is located in a side area of the module plane, and in a plane perpendicular to the thickness direction of the packaging base, the orthographic projection of the chip bearing part and the orthographic projection of the coil support are separated from each other. In this way, the chip package and the magnetic circuit system and the vibration system can be prevented from being stacked in series in the thickness direction of the module, thereby providing a structural basis for low profile of the module, effectively improving product size precision, vibration system resonance frequency consistency, reducing manual adjustment and processes, and reducing costs compared with the existing production method.

The invention provides a feed-forward type wireless noise reduction earphone structure and a wireless Bluetooth earphone. The feed-forward type wireless noise reduction earphone structure comprises an earphone shell module and a noise reduction processing module. The earphone shell module is composed of a noise reduction turbulent flow assembly, an in-ear shell, an L-shaped shell and an upper cover shell, the upper cover shell covers the L-shaped shell, the in-ear shell abuts against the L-shaped shell, and the L-shaped shell is provided with a device containing cavity used for fixing the noise reduction processing module. The top end of the L-shaped shell is provided with a pickup channel, a sound transmission cavity and a turbulent flow cavity, the turbulent flow cavity is communicated with the pickup channel, the pickup channel is communicated with the vertical sound transmission cavity, the noise reduction turbulent flow assembly covers the turbulent flow cavity, and an opening of the sound transmission cavity faces the microphone assembly of the noise reduction processing module. When the earphone is normally worn, the opening of the pickup channel faces the outer side of the human body helix, the main flow direction of external airflow can be avoided, and wind noise interference is reduced. The problem that a large amount of noise is mixed into sound signals due to the fact that a traditional earphone pickup hole is prone to being affected by wind noise is solved, and the microphone assembly can collect purer sound signals.

A kind of sound box, including cabinet and the protective cover being arranged in the front of cabinet, first acoustic cavity is equipped in the cabinet, high pitch loudspeaker assembly and bass horn assembly are equipped on the first acoustic cavity, second acoustic cavity is also equipped in the cabinet, the first acoustic cavity is communicated with second acoustic cavity by loudspeaker pipe passing through partition, the loudspeaker pipe is fixedly connected with cabinet, one end of the loudspeaker pipe is arranged in the back of high pitch loudspeaker assembly, the other end of the loudspeaker pipe is inserted into second acoustic cavity. By adding a second acoustic cavity in the cabinet and the loudspeaker pipe that is communicated with the first acoustic cavity and the second acoustic cavity, and one end of the loudspeaker pipe is arranged in the back of the high pitch loudspeaker assembly, the manufacturer selects loudspeaker pipe with different pipe diameter and different length according to actual situation, so that the inside of the loudspeaker pipe helps the reflection and resonance of sound waves, so that the utility model shows more rich tone, and then the sound performance comparable to real musical instrument.

The invention relates to an air conditioner control method, device, equipment, medium and program and an air conditioner, and relates to the technical field of air conditioners. The method comprises the steps that the air column audio frequency of the air conditioner in the running process is determined; and according to the preset pipeline inherent frequency and the air column audio frequency, the operation parameters of the air conditioner are adjusted, and the operation parameters comprise one or more of the valve opening degree, the outdoor unit rotating speed and the compressor frequency. According to the embodiment, the operation parameters of the air conditioner are adjusted through the preset pipeline inherent frequency and the preset air column audio frequency, abnormal sound generated by sound cavity resonance of the refrigerant pipeline of the air conditioner can be reduced in real time, the method is suitable for air conditioners with different types of pipeline assembly states, and on the premise that the temperature control of the air conditioner on the indoor environment is not affected, the indoor environment can be effectively protected. And the operation noise of the air conditioner is dynamically reduced in real time.

This application discloses a sound-generating device module for wearable electronic devices and the wearable electronic device itself, comprising: a module housing and a sound-generating unit, wherein a diaphragm is disposed on the end face of the sound-generating unit, and the sound-generating unit is fixedly disposed in the module housing; a vibration damping assembly, the vibration damping assembly comprising an elastic connector and a vibrating plate, the vibrating plate being suspended within the module housing via the elastic connector, the vibration damping assembly being connected to the end face of the sound-generating unit, the edge of the elastic connector being connected to the inner surface of the module housing, the vibration damping assembly dividing the inner cavity of the module housing into a front sound cavity and a rear sound cavity, and the vibrating plate being configured to passively vibrate when the diaphragm vibrates. The technical solution provided by this application can weaken the vibration propagating to the module housing when the sound-generating unit emits sound, thereby reducing the interference and impact of the sound-generating device module on other components in the electronic product.

A disposable forest fire detector, which mainly comprises a detection apparatus and a signal transceiving apparatus, wherein the detection apparatus comprises a trigger apparatus, a sound-producing apparatus, and an energy storage apparatus, the trigger apparatus being connected to the energy storage apparatus, and a sound-producing cavity being connected to the energy storage apparatus, and the trigger apparatus being used for triggering the energy storage apparatus to release energy that enables the sound-producing apparatus to operate. By means of using the detector, it is only necessary to widely cover a forest with sound-producing apparatuses for fire detection. After receiving signals, the signal transceiving apparatuses send the signals to a remote terminal of, for example, a fire command center, such that the detection of an entire fire can be completed. The sound-producing apparatus of the fire detector is small, light-weight, low-cost and environmentally friendly, and there is no need to deploy expensive smoke detectors or flame detectors.

This application discloses a speaker module and a smart wearable device. The speaker module includes a module housing, within which a speaker unit is housed. The speaker unit divides the speaker module's internal cavity into a front acoustic cavity and a rear acoustic cavity. The module housing has a vent hole connecting the rear acoustic cavity to the outside and a sound outlet hole connecting the front acoustic cavity to the outside. The sound outlet hole is located on a first sidewall of the front acoustic cavity. The distance from the center of the speaker unit to the second sidewall opposite the sound outlet hole is not less than 8.5 mm. The speaker module also includes an auxiliary sound hole, which is connected to the side of the front acoustic cavity opposite the sound outlet hole. The auxiliary sound hole is located adjacent to the vent hole, and the auxiliary sound hole and the sound outlet hole form a dipole structure with the vent hole. The technical solution of this application can solve the problem of standing wave interference, improve sound leakage, and enhance the sound output of the speaker module.

Disclosed is a smart head-mounted device, and the smart head-mounted device comprises at least one lens and at least one arm, the arm is connected to the lens and has a cavity therein; further comprises a sound production apparatus provided inside the cavity and dividing the cavity into a front acoustic cavity and a back acoustic cavity; a sound outlet and a main sound leakage hole provided on the arm, the sound outlet is in communication with the front acoustic cavity, and the main sound leakage hole is in communication with the back acoustic cavity.

This application relates to the field of terminal device technologies, and in particular, to a resonant cavity antenna and an electronic device. The resonant cavity antenna is used in the electronic device having a metal housing, and the electronic device includes an audio module. The resonant cavity antenna has a closed internal cavity, and the internal cavity is configured to communicate with an audio chamber of the audio module to serve as a portion of an acoustic cavity of the audio module. The resonant cavity antenna includes a dielectric substrate, and a metal sheet and a metal ground that are fastened to the dielectric substrate. The metal sheet and the metal ground are spaced apart, a ground point of the metal sheet is conductively connected to the metal ground, and the metal sheet and the metal ground form a resonant cavity body. An electromagnetic wave sent or received by the resonant cavity antenna may be reflected in the resonant cavity body. The internal cavity is at least partially located between the metal sheet and the metal ground. The resonant cavity antenna uses its own structure to expand a volume of the acoustic cavity of the audio module, so that sound quality of the audio module can be optimized.

The application discloses a modeling method and system of an acoustic cavity in whole vehicle NVH medium frequency analysis and a storage medium, and comprises the following steps: vehicle body structure screening, CAS data screening, acoustic cavity blocking, acoustic cavity modeling, acoustic cavity separation and connection, and acoustic cavity material attribute assignment. The acoustic cavity model established by the method is closer to the actual situation, can be used for early medium frequency NVH performance analysis, and the simulation result has high accuracy.

The invention relates to an ultrasonic testing device and to a method for nondestructively testing a component, in particular a fiber-plastic composite component, having: an ultrasonic testing head; and a liquid nozzle with a liquid inlet, a liquid outlet, and an inner surface which tapers towards the liquid outlet, wherein the liquid nozzle has at least one liquid guiding rib which protrudes inwards into the sound chamber from the tapering inner surface of the liquid nozzle upstream of the ultrasonic testing head.

The invention relates to the technical field of building noise control, and discloses a building noise control method based on sound absorption cavity design, which comprises the following steps: arranging a plurality of sound absorption cavities in a concrete truss, filling a porous sound absorption material in the cavities, covering a micro-perforated plate, and optimizing the noise reduction effect by adjusting the geometric dimensions and the arrangement mode of the cavities. According to the method, the internal space of the concrete truss can be fully utilized, the design parameters are optimized in combination with experimental testing and numerical simulation, low-frequency noise propagation is effectively inhibited, and the additional burden on a building structure is relieved. The sound absorption cavity is formed in the inner space of the concrete truss, and the porous sound absorption material and the micro-perforated plate are combined, so that the inner space of the concrete truss is fully utilized, and the additional burden of a traditional sound insulation measure on a building structure is avoided; the geometric dimension and the arrangement mode of the sound absorption cavities can be flexibly adjusted according to the building floor height and the noise frequency characteristic, and therefore the low-frequency noise suppression capacity is improved.

Disclosed in the present application is an earphone. The earphone comprises a core housing, and a speaker assembly and a button assembly which are disposed inside the core housing, wherein the speaker assembly comprises a main speaker and an acoustic cavity bracket, the acoustic cavity bracket cooperating with the main speaker to form an acoustic rear cavity; the button assembly is supported on the acoustic cavity bracket; and a button portion is provided on the core housing, which is configured to press and trigger the button assembly. By means of the arrangement, the present application can save on the internal space of the earphone, and reduce the size of the earphone, thereby improving the space utilization rate.

The invention relates to the technical field of micron-sized droplet jet flow and ink jetting, in particular to an acoustically-driven micro-droplet jetting method and device, and the method comprises the steps that to-be-jetted liquid is stably conveyed to a nozzle micropore assembly; generating an ultrasonic signal, and driving an ultrasonic transducer after power amplification; the resonant vocal cavity nozzle is driven by the ultrasonic transducer, and a stable standing wave sound field with a sub-wavelength scale is formed in the cavity; acoustic radiation force is used for acting on a liquid column at the end of the spray head, and non-contact separation and directional spraying of liquid drops are achieved. The nozzle is controlled by the multi-axis motion platform to move on the substrate, so that liquid drops are deposited according to a preset track. According to the method and the device, the problems of nozzle blockage and the like caused by high viscosity or high solid content of liquid in a traditional piezoelectric or electrofluid driving mode are solved; the control precision of the liquid drop size and the spraying speed can be remarkably improved, and the device has excellent fluid adaptability and spraying stability and is particularly suitable for precise deposition and graphical jet printing of complex fluid such as photoresist, metal slurry and functional nano materials.

The invention belongs to the technical field of electroacoustics, and particularly relates to a sound production device and electronic equipment, the sound production device comprises a shell, a sound production monomer and a breathable separator, the sound production monomer and the breathable separator are arranged in the shell, the sound production monomer is matched with the shell to define a front sound cavity and a rear sound cavity in the shell, and the rear sound cavity is filled with a sound absorbing material; the breathable separator is used for isolating the sound-absorbing material and the sound-producing monomer, the sound-absorbing material comprises first molecular sieve powder particles with the average particle size of 10-50 microns and sound-absorbing particles with the average particle size of 150-1000 microns, and the sound-absorbing particles are sphere-like particles formed by bonding a plurality of second molecular sieve powder particles; and the air-permeable aperture of the air-permeable separator is smaller than the minimum particle size of the first molecular sieve powder particles. According to the invention, the first molecular sieve powder particles can be filled in the narrow space of the rear sound cavity and the gaps where the sound-absorbing particles are stacked, so that the filling amount of the sound-absorbing material in the rear sound cavity is increased, the resonant frequency of the sound production device is effectively reduced, and the low-frequency acoustic performance of the sound production device is improved.

This invention discloses a high-power capacity bulk acoustic wave (BAW) device, belonging to the technical field of BAW devices. It includes a substrate, a support layer disposed above the substrate, and an acoustic cavity disposed within the support layer. A transducer stack covers the acoustic cavity, comprising a bottom electrode, a piezoelectric layer, and a top electrode stacked sequentially. At least one thermally conductive support pillar is disposed within the acoustic cavity, with one end connected to the transducer stack and the other end connected to the substrate, forming a heat conduction path for dissipating heat from the transducer stack to the substrate. The high-power capacity BAW device of this invention aims to solve the problem of ineffective heat dissipation in traditional BAW devices during high-power operation, thereby improving the device's power capacity and reliability and avoiding performance degradation and structural damage caused by heat accumulation.