44results about How to "Improve low frequency performance" patented technology

The invention provides an acoustic compatibilization material, a preparation method thereof, a loudspeaker module and electronic equipment. The acoustic compatibilization material comprises a living carrier and a porous material, the living carrier has a pore structure, and the pore structure comprises mesopores and macropores; the porous material is loaded or embedded in the pore structure of the living carrier; the porous material is provided with # imgabs0 two-dimensional pore channels and / or three-dimensional pore channels, and the pore channels are communicated with one another. The invention also provides a preparation method of the acoustic compatibilization material, which comprises the following steps: immersing the living carrier in a solution of a porous material precursor, and crystallizing to obtain the acoustic compatibilization material, the preparation method does not comprise a roasting step. The invention further provides a loudspeaker module which comprises the acoustic compatibilization material. The invention further provides an electronic device. The electronic device comprises the loudspeaker module. The acoustic compatibilization material provided by the invention has a hierarchical pore structure, has a relatively good acoustic compatibilization effect, and can effectively improve the low-frequency effect of a loudspeaker.

The invention provides an acoustic compatibilization material, a preparation method thereof, a loudspeaker module and electronic equipment. The acoustic compatibilization material comprises a living carrier and a COF material, wherein the living carrier is provided with mesopores and macropores; the COF material is loaded and / or embedded in the pore structure of the living carrier; the COF material is provided with three-dimensional pore channels with the pore diameter not smaller than 0.4 nm, and the pore channels are communicated with one another. The COF material has good binding force with the living carrier, so that the mechanical property of the living material can be improved, and the water absorption rate of the living carrier can be greatly reduced. The invention also provides a preparation method of the acoustic compatibilization material, and the preparation method comprises the following steps: immersing a living carrier in a solution of a COF material precursor, and crystallizing to obtain the acoustic compatibilization material, the method does not comprise a roasting step. The acoustic compatibilization material provided by the invention has a hierarchical pore structure, has a relatively good acoustic compatibilization effect, and can effectively improve the low-frequency effect of a loudspeaker.

The invention discloses an in-ear type ear clamping Bluetooth earphone, which comprises a Bluetooth earphone body, one end of the Bluetooth earphone body is provided with an ear clip used for clamping the auricle of a human body, the end part of the ear clip is connected with a mounting shell, and the outer side of the mounting shell is provided with a sound output part matched with the auricular conchae of the human body. An ear clamping space is formed among the ear clip, the Bluetooth earphone body at the two ends of the ear clip and the mounting shell, the ear clip is a soft clip, the size of a clamping area of the ear clamping space is adjustable, the sound output part comprises a sound output cylinder and a sound output port, a loudspeaker is fixedly mounted in the mounting shell, and the sound output cylinder is arranged on the outer side of the mounting shell. The ear-clamping space is adjustable, so that the earphone can adapt to different ear shapes, the wearing stability is improved, the earphone is prevented from slipping off during movement, and the in-ear rubber sleeve made of silica gel can provide soft touch feeling, adapt to the shape of an ear canal, reduce friction and compression feeling and improve the wearing comfort.

The present application provides a vibration absorption device and an electronic device, which relate to the field of communication technology. The electronic device includes a shell, a speaker and a vibration absorption device. The speaker is arranged in the shell, and a first cavity is formed between the speaker and the shell; the outer shell of the speaker is provided with a first opening, and the vibration absorption device is arranged at the first opening, and the first opening is connected to the first cavity through the vibration absorption device.

The invention discloses LaxCe (1-x) O (2-0.5 x) hollow microspheres and a preparation method thereof, and belongs to the field of rare earth metallurgy. The LaxCe (1-x) O (2-0.5 x) hollow microspheres are prepared by grinding LaxCe (1-x) O (2-0.5 x) (x = 0, 0.36, 0.5) powder, performing spray granulation and performing high-temperature firing. The slurry for spray granulation is high in concentration and good in dispersity, the production cost of spray granulation is reduced, and the yield of hollow microspheres is increased; the prepared LaxCe (1-x) O (2-0.5 x) hollow microspheres have the advantages of light weight, heat insulation, sound insulation and excellent low-frequency performance, and have good application prospects in the fields of reflective thermal insulation coatings, light thermal insulation materials, thermal spraying thermal insulation and wear-resistant materials, thermal insulation plates, sewage purification, sound absorption materials, drug sustained-release and controlled-release bodies, catalyst carriers, photoelectric materials and the like.

The invention discloses a low-profile ultra-wideband antenna and a working method thereof, and the antenna comprises a radiator which carries out the effective radiation of the antenna at a first frequency band; the antenna feed body and the radiating body are partially projected and overlapped along the direction vertical to the ground plane, and the projected and overlapped parts are mutually coupled to form a coupled feed structure; the antenna feed body is used for transmitting energy to the radiator and serves as the radiator to provide impedance matching in a second frequency band; the coupled feeding structure is used for carrying out coupled feeding, realizing impedance matching of the first frequency band and expanding the impedance bandwidth of the first frequency band; the branch antenna is used for providing radiation in a third frequency band and assisting the radiation of the parasitic antenna in a fourth frequency band; the parasitic antenna provides radiation in a fifth frequency band. The antenna is used for realizing ultra-wide frequency band coverage in a limited space, and good radiation performance and impedance matching effect can be provided in each frequency band.

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.

The present invention discloses an ear-hanging personal audio device, the key points of the technical solution are that it includes a housing, a speaker and a front conduit, one side of the speaker is connected to the front conduit and sealed with each other, the speaker is provided with a radiation port, the sound waves radiated by the speaker are transmitted to a distance less than 10mm from the ear canal opening through the front conduit. The other side of the speaker is sealed and connected with a rear conduit, the sound waves radiated by the other side of the speaker are transmitted to the back of the ear through the rear conduit, and the shortest propagation distance of the sound waves from the tube mouth of the rear conduit to the ear canal opening is not less than 40mm. The present invention opens the ear canal, making it convenient for users to hear surrounding sounds. The bass is rich, and adding a conduit to the speaker will not increase the resonant frequency of the speaker like adding a box to the speaker, but will reduce the resonant frequency and improve the low-frequency effect of the speaker.

The present invention is applicable to the technical field of electro-acoustic audio equipment, and provides an audio device, including a box, a sound-emitting component and a sound-emitting cavity, wherein the sound-emitting component is located in the sound-emitting cavity, the box is provided with a primary phase-guiding structure and a secondary phase-guiding structure for non-linear air conduction, the secondary phase-guiding structure has a first opening and a second opening, the second opening is connected to the primary phase-guiding structure, the primary phase-guiding structure is arranged in a substantially vertical direction, the secondary phase-guiding structure is arranged substantially perpendicular to the primary phase-guiding structure, and the first opening and the sound-emitting component are arranged on both sides of the box. The audio device provided by the present invention weakens the phase-guided sound wave by adding a primary phase-guiding structure and a secondary phase-guiding structure for non-linear air conduction, so that the sound wave is in a non-vertical incidence relationship with the wall, so that the audio device of the present invention combines the advantages of the front phase-guiding and rear phase-guiding audio structures with the ABR passive diaphragm phase-guided audio, and reduces the influence of the sound effect on the wall and the distance from the wall while retaining the good low-frequency effect.

This application relates to an earphone, which includes a housing, a speaker module, and a vibrator. The housing has a receiving cavity and includes a first housing and a second housing. The first housing and the second housing are connected by an elastic connector so that the first housing can vibrate relative to the second housing. The first housing and the second housing enclose the receiving cavity. The first housing or the second housing is provided with a sound outlet, which communicates with the receiving cavity. The speaker module is disposed in the receiving cavity. The sound waves emitted by the speaker module are conducted through the air and transmitted through the sound outlet. The vibrator is disposed in the receiving cavity and connected to the first housing. The vibrator drives the first housing to vibrate so as to conduct sound waves through the bone. This application realizes the conduction of sound waves through "air conduction combined with bone conduction", and the elastic connector can effectively alleviate the sound leakage problem and improve the low-frequency sound quality.

The utility model relates to the technical field of antenna structures, and provides a broadband multi-branch dual-frequency antenna and radio frequency equipment, and the broadband multi-branch dual-frequency antenna comprises a dielectric substrate; the antenna main body unit is arranged on the dielectric substrate, and the antenna main body unit comprises a low-frequency branch knot and a high-frequency branch knot which are connected with each other; the grounding unit is connected with the antenna main body unit, and a gap structure is arranged between the grounding unit and the antenna main body unit; the first parasitic branch knot is connected with the grounding unit and is adjacent to the antenna main body unit, the bandwidth of the broadband multi-branch-knot dual-frequency antenna is expanded, and the matching characteristic of the antenna is improved.

The application provides an acoustic transducer and a terminal device. The acoustic transducer comprises a substrate, a shell and a vibrating piece. The shell is connected to the substrate. The vibrating piece is arranged in the shell. A support frame is arranged between the substrate and the vibrating piece. The vibrating piece is in a plate structure. The vibrating piece comprises at least an anchor end, a driving force arm, a torsion arm and a diaphragm. Part of the structure of the driving force arm and part of the structure of the diaphragm are movably connected to the vibrating piece. The first end of the diaphragm is connected to the driving force arm. One end of the torsion arm is rotatably connected to the connection position of the diaphragm and the driving force arm. The other end of the torsion arm is connected to the anchor end and / or the support frame. At least part of the structure of the anchor end is fixedly connected to the support frame. The distance from the torsion arm to the second end of the diaphragm is greater than the distance from the torsion arm to the end of the driving force arm away from the diaphragm. When the driving force arm rotates around the torsion arm, the diaphragm can be driven to rotate around the torsion arm and enter an open state. The acoustic transducer has the advantages of small volume, large amplitude, low first-order resonance frequency f0, good low-frequency performance and high sound pressure level.

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, and the sound production device comprises a housing, a magnetic circuit system, a vibration system and a supporting member. The vibrating system comprises a vibrating diaphragm, a framework, a voice coil and a centering disk, the vibrating diaphragm is connected with the shell and the framework, the voice coil is connected with the framework and corresponds to a magnetic gap of the magnetic circuit system, the centering disk is connected with the framework and the shell, the framework comprises a body part and a conductive layer, the centering disk is provided with a conductive part, and the conductive part and a lead part of the voice coil are electrically connected with the conductive layer respectively; the framework is provided with a first magnetic attraction part, the supporting piece is provided with a second magnetic attraction part located on the side, opposite to the magnetic circuit system, of the vibrating diaphragm, first attraction force exists between the first magnetic attraction part and the second magnetic attraction part, second attraction force exists between the first magnetic attraction part and the magnetic circuit system, and in the non-working state, the vibrating system is located at the balance position under the action of the first attraction force and the second attraction force. According to the technical scheme, the low-frequency effect and the acoustic performance of the sound production device can be improved.

This invention discloses a super-linear loudspeaker and its manufacturing method, comprising a square bar-shaped loudspeaker body that cooperates with a display screen. The loudspeaker body includes a support frame, which includes a first-stage frame that cooperates with a sound-generating unit and a second-stage frame that cooperates with a magnetic circuit unit. The first-stage frame and the second-stage frame are arranged in a stepped manner. The magnetic circuit unit includes a magnetic cup and a magnet disposed within the magnetic cup. The sound-generating unit includes a diaphragm disposed at the top of the first-stage frame and a voice coil that drives the diaphragm to vibrate. A magnetic gap is formed between the magnet and the sidewall of the magnetic cup to cooperate with the voice coil. A main frame is disposed between the voice coil and the diaphragm. The top of the main frame is fixedly connected to the diaphragm, and the bottom of the main frame is fixedly connected to the voice coil. By optimizing the loudspeaker shape, adding a small diaphragm structure welded to the back of the FPC, and optimizing the magnetic circuit structure, the low frequency is better during sound generation, and the power consumption, distortion, and space occupation are smaller, resulting in higher loudness.

The present invention provides an earplug for a hearing device and a hearing device, the earplug comprising an earplug housing for insertion into an ear canal of a user and having a distal end and a proximal end with an earplug axis therebetween, the earplug housing having an outer surface connecting the distal end to the proximal end; comprising a receiver housing, the receiver being located within the earplug housing; and a first microphone configured to pick up ear canal sound, where the receiver includes a moving coil.

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, and the sound production device comprises a housing, a magnetic circuit system, a vibration system and a supporting member. The vibrating system comprises a vibrating diaphragm, a framework, a voice coil and a centering disk, the vibrating diaphragm is connected with the shell and the framework, the voice coil is connected with the framework, the centering disk is connected with the framework and the shell, the framework is provided with at least two connecting structures, the centering disk is provided with conductive parts, and the connecting structures are electrically connected with the corresponding conductive parts and lead parts of the voice coil respectively; the framework is provided with a first magnetic attraction part, the supporting piece is provided with a second magnetic attraction part located on the side, opposite to the magnetic circuit system, of the vibrating diaphragm, first attraction force exists between the first magnetic attraction part and the second magnetic attraction part, second attraction force exists between the first magnetic attraction part and the magnetic circuit system, and in the non-working state, the vibrating system is located at the balance position under the action of the first attraction force and the second attraction force. According to the technical scheme, the low-frequency effect and the acoustic performance of the sound production device can be improved.

This utility model discloses a bone conduction vibrator and electronic device, relating to the field of acoustic technology. The bone conduction vibrator includes a housing assembly, a permanent magnet circuit system, two coils, a magnetic guide plate assembly, and a reset assembly. The permanent magnet circuit system is disposed within the housing assembly and includes an iron edge assembly and two sets of magnet assemblies. Each set of magnet assemblies includes two magnets with opposite poles. The two coils are disposed within the housing assembly and are located on opposite sides of the permanent magnet circuit system. The magnetic guide plate assembly includes two magnetic guide plates that pass through the two coils and extend between the two magnets of the magnet assembly. The adjacent ends of the two magnetic guide plates are not directly magnetically connected. The reset assembly is connected between the magnetic guide plate assembly and the permanent magnet circuit system and includes a spring for providing elasticity. The spring has a suspended portion disposed opposite to the coil. The effective width of the suspended portion of at least part of the spring is smaller than its width, which helps to reduce the spring stiffness coefficient and improve the low-frequency effect.

The invention discloses a sound absorption assembly, a sound production device and electronic equipment, and relates to the acoustics field, the sound absorption assembly comprises a shell and a sound absorption material filled in the shell, the shell comprises a main body part and a sealing cover part, the main body part defines a containing space, the sound absorption material is filled in the containing space, and the sealing cover part is arranged in the containing space. The sound-absorbing material comprises at least one of sound-absorbing particles and sound-absorbing raw powder, the sound-absorbing particles comprise a plurality of sound-absorbing raw powder and a bonding agent for bonding the plurality of sound-absorbing raw powder into a whole, the sealing cover part covers the main body part to seal the accommodating space, the main body part is of a porous structure formed by stacking cellosilk, the porosity of the main body part is 40-90%, and the sound-absorbing raw powder is arranged in the main body part. And the bursting strength of the main body part is greater than 5N. The main body part of the sound absorption assembly has proper porosity, is good in air permeability and can effectively package the sound absorption material, the bursting strength is larger than 5 N, the structural firmness is good, and the situation of breakage is not prone to occurring.

The invention discloses a high-capacity air gun combination design method for expanding low-frequency-band energy, and relates to the field of deep sea resource exploration. The problem of how to use a high-capacity air gun array to obtain high-quality pressure wavelets in practical engineering application is solved. The method comprises the following steps: establishing a low-frequency air gun array pressure wavelet and frequency spectrum prediction method in combination with a bubble pulsation equation and a bubble group coupling mechanism; the total volume of the low-frequency air gun array is adjusted, and sound pressure level spectrograms under different array total volumes are obtained through a low-frequency air gun array pressure wavelet and frequency spectrum prediction method; a low-frequency air gun combination composed of two air guns is designed, and sound pressure level spectrograms under different low-frequency air gun intervals are obtained; 4, designing a low-frequency air gun combination composed of four air guns, and obtaining sound pressure level spectrograms under different low-frequency air gun arrangement modes; and according to the obtained sound pressure level spectrograms under different conditions, determining to increase the array total volume, the air gun spacing and the air gun arrangement mode, and completing the design of the novel low-frequency air gun combination.

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, and the sound production device comprises a housing, a magnetic circuit system, a vibration system and a supporting member. The vibrating system comprises a vibrating diaphragm, a framework, a voice coil and a centering disk, the vibrating diaphragm is connected with the shell and the framework, one end of the voice coil is connected with the framework, the other end of the voice coil corresponds to the magnetic gap, the centering disk is connected with the framework and the shell, the centering disk is provided with a conductive part, and a lead part of the voice coil is arranged along the framework and electrically connected with the corresponding conductive part; the framework is provided with a first magnetic attraction part, the supporting piece is provided with a second magnetic attraction part located on the side, opposite to the magnetic circuit system, of the vibrating diaphragm, first attraction force exists between the first magnetic attraction part and the second magnetic attraction part, second attraction force exists between the first magnetic attraction part and the magnetic circuit system, and in the non-working state, the vibrating system is located at the balance position under the action of the first attraction force and the second attraction force. According to the technical scheme, the low-frequency effect and the acoustic performance of the sound production device can be improved.

The invention provides a loudspeaker system and electronic equipment, and the loudspeaker system comprises a first housing which is internally provided with a first accommodation cavity; the first active vibrating diaphragm is arranged in the first accommodating cavity; the second shell is internally provided with a second accommodating cavity, and the second accommodating cavity is communicated with the first accommodating cavity to form a closed cavity; the first passive vibrating diaphragm is arranged on one side of the second shell and is driven by the first active vibrating diaphragm to vibrate; the at least one second passive vibrating diaphragm is arranged on one side, opposite to the first passive vibrating diaphragm, of the second shell, and the oscillation starting directions of the second passive vibrating diaphragm and the first passive vibrating diaphragm are opposite; and / or, the second passive vibrating diaphragm and the first passive vibrating diaphragm are arranged on the same side of the second shell, and the oscillation starting directions of the second passive vibrating diaphragm and the first passive vibrating diaphragm are the same. The displacement distance of the first passive diaphragm can be reduced, the low-frequency vibration sense of the loudspeaker system is weakened, and the low-frequency performance of the loudspeaker system is improved.

The invention discloses a sound production device and electronic equipment. The sound production device comprises a device shell, a voice coil and a vibration assembly, wherein the voice coil and the vibration assembly are arranged in an inner cavity of the device shell; the vibration assembly comprises a first magnet, a second magnet and an elastic base, and the elastic base divides the inner cavity into a front cavity and a rear cavity which are isolated from each other; the first magnet and the second magnet are arranged on the elastic base, the first magnet is arranged around the second magnet, and a magnetic gap is formed between the first magnet and the second magnet; the first end of the voice coil is connected with the device shell, the second end of the voice coil extends into the magnetic gap, and the voice coil is used for driving the vibration assembly to vibrate through magnetic cooperation between the voice coil and the first magnet and the second magnet when the voice coil is powered on. According to the scheme, the problem that the design feasibility is poor due to the fact that the volume of the rear cavity is enlarged or the rear cavity is filled with the sound absorption particles in the sound production device related to the related technology can be solved.

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electro-acoustic transduction, the sound production device comprises a shell, a magnetic circuit system, a vibration system and a supporting piece, the vibration system is arranged on one side of the magnetic circuit system, the vibration system comprises a vibrating diaphragm, a framework, a voice coil and a centering disk, the vibrating diaphragm is connected with the shell and the framework, one end of the voice coil is connected with the framework, and the other end of the voice coil is connected with the supporting piece. The framework is provided with a magnetic material coating as a first magnetic attraction part, and the centering disk is connected with one end, far away from the vibrating diaphragm, of the framework and the shell respectively; at least part of the supporting piece is located on the side, opposite to the magnetic circuit system, of the vibrating diaphragm and provided with a permanent magnet serving as a second magnetic attraction part, first attraction force exists between the first magnetic attraction part and the second magnetic attraction part, second attraction force exists between the first magnetic attraction part and the magnetic circuit system, and in the non-working state, the vibrating system is located at the balance position under the action of the first attraction force and the second attraction force. According to the technical scheme, the low-frequency effect and the acoustic performance of the sound production device can be improved.

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electro-acoustic transduction, the sound production device comprises a shell, a magnetic circuit system, a vibration system and a supporting piece, the vibration system is arranged on one side of the magnetic circuit system, the vibration system comprises a vibrating diaphragm, a framework, a voice coil and a centering disk, the vibrating diaphragm is connected with the shell and the framework, one end of the voice coil is connected with the framework, and the other end of the voice coil is connected with the supporting piece. At least part of the framework is made of a magnetic conductive material and serves as a first magnetic attraction part, and the centering disk is connected with the end, away from the vibrating diaphragm, of the framework and the shell. At least part of the supporting piece is located on the side, opposite to the magnetic circuit system, of the vibrating diaphragm and provided with a second magnetic attraction part, first attraction force exists between the first magnetic attraction part and the second magnetic attraction part, second attraction force exists between the first magnetic attraction part and the magnetic circuit system, and in the non-working state, the vibrating system is located at the balance position under the action of the first attraction force and the second attraction force. According to the technical scheme, the low-frequency effect and the acoustic performance of the sound production device can be improved.

The present application relates to the technical field of acoustic products, and discloses a diaphragm for a micro sound generating device and the micro sound generating device. The diaphragm comprises a rubber film layer formed by cross-linking reaction of an acrylate polymer, wherein the acrylate polymer contains a carboxylic acid group, and the cross-linking agent is an amine cross-linking agent. By using the acrylate polymer containing the carboxylic acid group and the amine cross-linking agent, the cross-linking degree is effectively improved, so that the diaphragm has excellent rebound performance and temperature resistance; meanwhile, the forming mode of the diaphragm is not limited, and the preparation cost is reduced; and the low-frequency performance of the micro sound generating device is also improved, so that the micro sound generating device has full bass and comfortable listening experience.

This application discloses a sound-generating device and an electronic device. The sound-generating device includes a device housing and a voice coil and a vibration assembly disposed within the inner cavity of the device housing. The vibration assembly includes a first magnet, a second magnet, and an elastic base. The elastic base divides the inner cavity into a mutually isolated front cavity and a rear cavity. The first magnet and the second magnet are disposed on the elastic base, with the first magnet surrounding the second magnet, forming a magnetic gap between the first magnet and the second magnet. A first end of the voice coil is connected to the device housing, and a second end of the voice coil extends into the magnetic gap. The voice coil is used to drive the vibration assembly to vibrate through magnetic cooperation with the first magnet and the second magnet when energized. The above solution can solve the problem of poor design feasibility in related technologies that involve increasing the volume of the rear cavity or filling the rear cavity with sound-absorbing particles.

The present invention provides a speaker system and electronic equipment, wherein the speaker system includes a first housing, in which a first accommodating cavity is arranged; at least one passive diaphragm is arranged in the first accommodating cavity, and the first accommodating cavity is divided into a first front cavity and a first rear cavity; a second housing, in which a second accommodating cavity is arranged, and an active diaphragm is arranged in the second accommodating cavity, and the active diaphragm divides the second accommodating cavity into a second front cavity and a second rear cavity, and the second rear cavity is connected with the first rear cavity to form a closed cavity; a central magnetic block is fixed to the side of the passive diaphragm facing away from the first front cavity; a magnetic component includes a first magnetic member arranged in the first front cavity and a second magnetic member arranged in the first rear cavity, and the first magnetic member and the second magnetic member have the same magnetization direction as the central magnetic block, and the cooperative force of the first magnetic member and the second magnetic member on the central magnetic block is zero when the passive diaphragm is in a non-vibrating state. The present invention can reduce the equivalent stiffness of the passive diaphragm, weaken the low-frequency vibration sense of the speaker system, and improve the low-frequency performance.

The invention provides a flexible ultrahigh frequency sensor for partial discharge detection and application thereof, and can be applied to the technical field of partial discharge detection. The flexible ultrahigh frequency sensor comprises a flexible substrate, a radiation area, a grounding area and a feeder line area, wherein the radiation area comprises a main radiation area and a plurality of auxiliary radiation areas, the main radiation area is rectangular, the auxiliary radiation areas are distributed on the periphery of the main radiation area, the auxiliary radiation areas are in an isosceles right triangle shape, the main radiation area and the auxiliary radiation areas are of an integrated structure, and the bevel edges of the auxiliary radiation areas are connected with the main radiation area.

The utility model provides an acoustic equipment and loudspeaker device thereof, loudspeaker device includes: shell, a plurality of oscillators, a plurality of reverse phase holes, shell defines the chamber, the shell has vibration panel, vibration panel includes first area and second area arranged at intervals, a plurality of oscillators set up in first area, and be in the chamber, oscillator is configured to make vibration panel vibrate to produce sound wave, a plurality of reverse phase holes are set up on second area.

The sound absorption scatterer comprises a back plate and a plurality of cavities, each cavity is composed of a resonance cavity and an embedded pipe, the two ends of each embedded pipe are open, the tail ends of the embedded pipes penetrate into the cavities, and the top ends of all the embedded pipes are located on the horizontal plane where the upper surfaces of the cavities are located. The tail ends of the embedded pipes are located on the same horizontal plane in the cavity, the embedded pipes comprise the large-hole embedded pipe and the small-hole embedded pipe, the radius of the large hole is larger than or equal to 4 mm and smaller than 7 mm, and the radius of the small hole is larger than or equal to 0.55 mm and smaller than 4 mm. The sound absorption scatterer achieves more than 50% of sound absorption within the frequency band of 1000-2000 Hz and has the sound scattering effect, and the scattering center frequency is 3430 Hz. The sound absorption and scattering performance requirements of the material can be met at the same time, customization can be carried out according to needs, space is saved, pollution is small, and the service life is long.