39results about How to "Improve acoustic performance" patented technology

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic energy conversion, the sound production device comprises a magnetic circuit system and a vibration system, the magnetic circuit system comprises a magnetic conductive yoke, and a center magnetic circuit and a side magnetic circuit arranged on the magnetic conductive yoke, the side magnetic circuit is located at the periphery of the center magnetic circuit, and the side magnetic circuit and the center magnetic circuit are arranged at an interval to form a magnetic gap; the side magnetic circuit comprises two side magnets and a side magnetic conductive plate surrounding the central magnetic circuit; the side magnetic conductive plate comprises two long-side magnetic conductive parts and two short-side magnetic conductive parts, the two long-side magnetic conductive parts are connected with the ends, away from the magnetic conductive yoke, of the two side magnets respectively, each short-side magnetic conductive part comprises a magnetic conductive part body and an extension part arranged on the side, facing the magnetic conductive yoke, of the magnetic conductive part body, and the extension parts extend towards the magnetic conductive yoke; the vibration system comprises a vibrating diaphragm and a voice coil which is connected with the vibrating diaphragm and drives the vibrating diaphragm to vibrate. The voice coil is arranged corresponding to the magnetic gap. By arranging the extension part, magnetic loops on the two sides of the voice coil in the long axis direction of the central magnetic circuit are increased, and the acoustic performance of the sound production device is improved.

This invention relates to the field of electroacoustic conversion, and more particularly to a sound-generating device, comprising a frame, a vibration system fixed to the frame, and a magnetic circuit system for driving the vibration system to generate sound. The vibration system includes a diaphragm fixed to the frame and a voice coil that drives the diaphragm to vibrate. The frame includes a ring-shaped metal frame and plastic portions respectively injection-molded into the metal frame and covering a portion of the metal frame. The magnetic circuit system is fixedly connected to the metal frame by welding. The sound-generating device also includes conductive solder pads embedded in the plastic portions and exposed for introducing external electrical signals. The voice coil is electrically connected to the conductive solder pads. Compared with the prior art, the magnetic circuit system of the frame and lower clamp of this invention is increased, improving the connection and fixation effect between the frame and the magnetic circuit system. At the same time, since the flexible circuit board is housed in the clearance space and extends along the length direction of the clearance space, the conductivity reliability of the sound-generating device is effectively improved.

The utility model provides a kind of sound production device, it includes basin frame, the vibration system and magnetic circuit system fixed in basin frame;Vibration system includes diaphragm fixed in basin frame, skeleton fixed in diaphragm close to magnetic circuit system side and voice coil fixed in skeleton, diaphragm includes vibration part, fold ring part extended outward by the circumference of vibration part and fixed part extended outward by fold ring part;Magnetic circuit system has magnetic gap, skeleton is fixed in vibration part and extends to magnetic gap, and voice coil is suspended in magnetic gap;The width of voice coil along the first direction perpendicular to the vibration direction of diaphragm is greater than the width of vibration part along the first direction.The utility model discloses sound production device in the case of same size, can make the size of voice coil larger, cannot appear problem of difficult to wind, to improve the acoustic performance of sound production device, in addition, in the case of the same size of voice coil, the size of sound production device can also be reduced, to reserve more space for other devices.

The utility model discloses a sounding unit, which comprises a magnetic circuit assembly, a voice coil, a diaphragm assembly and a framework, the magnetic circuit assembly comprises an upper yoke, a lower yoke, a central magnetic structure and an edge magnetic structure, the central magnetic structure and the edge magnetic structure are respectively arranged on the lower yoke, and the upper yoke covers the central magnetic structure and the edge magnetic structure. The magnetic circuit assembly is provided with a magnetic gap, the magnetic gap surrounds the central magnetic structure, the magnetic gap is located between the upper yoke and the lower yoke, the magnetic circuit assembly is provided with a first magnetic loop and a second magnetic loop which are opposite in direction, the first magnetic loop penetrates through the upper portion of the magnetic gap, and the second magnetic loop penetrates through the lower portion of the magnetic gap. The second magnetic loop passes through the lower part of the magnetic gap; the framework comprises an inner mounting part, a connecting part and an outer mounting part which are connected in sequence, the inner mounting part is connected with the voice coil, the outer mounting part is connected with the transition part, the inner mounting part comprises a connecting plate and an inner side plate located on the inner side of the voice coil, and the connecting plate and the inner side plate are respectively bonded and fixed with the voice coil. The sound production unit is good in acoustic performance, and the skeleton and the voice coil are not easy to separate.

The utility model discloses a packaging structure and electronic equipment. The packaging structure comprises a substrate, a shell, a vibration pickup assembly, a supporting plate, an MEMS chip and an ASIC chip. The shell is arranged on the substrate, and an accommodating cavity is formed between the shell and the substrate; the vibration pick-up assembly is arranged on the substrate and located in the containing cavity, and the vibration pick-up assembly is used for picking up vibration signals; the supporting plate is stacked on the side, away from the base plate, of the vibration pickup assembly, and a through hole is formed in the supporting plate. The MEMS chip is arranged on one side, far away from the vibration pick-up assembly, of the supporting plate and is opposite to the through hole, and a vibration signal picked up by the vibration pick-up assembly can be transmitted to the MEMS chip through the through hole; and the ASIC chip is packaged in the accommodating groove and is electrically connected with the MEMS chip and the substrate respectively. The packaging structure provided by the utility model can improve the acoustic performance of the bone voiceprint sensor.

The utility model discloses a loudspeaker diaphragm supporting structure, which comprises a sound basin, magnetic steel arranged at the bottom of the sound basin, a voice coil and a framework arranged in the cavity of the sound basin, a diaphragm sleeved on the framework, a bracket arranged on the sound basin and used for supporting the diaphragm, a gasket arranged above the diaphragm, and a compression ring arranged above the gasket. The pressing ring is connected with the sound cone through a plurality of bolts, a pressing sheet is arranged at the center above the vibrating diaphragm, the pressing sheet is in threaded connection with the framework, the vibrating diaphragm comprises a vibrating diaphragm main body, a connecting part matched with the framework is arranged below the vibrating diaphragm main body, and a first folding lug is arranged at the edge of the main body; according to the utility model, through multiple mechanical fixation of cooperation of the sound cone bracket and the first folding lug of the vibrating diaphragm, threaded connection of the pressing sheet and the skeleton, and fastening of the pressing ring and the bolt, the risk of easy degumming and sound leakage at part of the sealing edge during long-term use when the sealing edge of the vibrating diaphragm is bonded through a gasket to realize supporting traditionally is avoided, the stability of the vibrating diaphragm and the high efficiency of sound wave conduction are ensured, and the service life of the vibrating diaphragm is prolonged. And the tone quality performance and the service life under high volume are obviously improved.

The application provides a mask base cloth and a preparation method and application thereof, and the preparation method comprises the following steps: a first mixed fiber comprises a combination of fine denier viscose fibers and modal fibers, which is subjected to opening, double-carding and laying, to obtain a skin-felt fiber web layer; a second mixed fiber comprises a combination of vinylon fibers and seaweed fibers, which is subjected to opening, double-carding and laying, to obtain a micro-elastic web layer; the skin-felt fiber web layer and the micro-elastic web layer are stacked and then subjected to water jet entanglement, and the obtained semi-finished product is dried to obtain the mask base cloth. Through the design of fiber types and the compounding of the fiber types with a double carding machine, a specific double-layer structure is obtained, and the water jet process is combined, so that the mask base cloth has a specific microporous structure, cavitation effect and energy loss are avoided, the mask base cloth has excellent skin feeling, high air permeability, excellent liquid absorption and retention capacity, mechanical properties and acoustic properties, can be highly matched with ultrasonic beauty equipment, and can play a lifting and tightening effect.

This utility model proposes a battery pack cover and a battery pack. The battery pack cover includes a cover body, which comprises an upper plate profile and a lower plate profile. The upper and lower plate profiles are arranged parallel to each other and are fixedly connected by multiple connecting structures. This utility model adopts a double-layer plate profile and multi-point connection structure design, which significantly improves the overall rigidity and impact resistance of the battery pack cover. The upper and lower plate profiles form a stable grid-like support frame through horizontally, vertically, and obliquely arranged reinforcing ribs, and can be optionally equipped with intermediate support structures such as honeycomb core material or foam filling, which effectively improves bending and torsional resistance, suppresses large-span deformation, and enhances top protection through structural energy absorption mechanism, solving the technical problems of insufficient rigidity, easy deformation, and poor impact resistance of traditional single-layer plate structures.

The application discloses a loudspeaker module and an electronic device. The loudspeaker module comprises a shell, a loudspeaker unit and an adjusting module. The shell has a containing cavity. The loudspeaker unit is arranged in the containing cavity and is configured to convert an electric signal into an acoustic signal. The adjusting module is connected with the loudspeaker unit and is arranged in the containing cavity. A back sound cavity is formed between the adjusting module and the loudspeaker unit. The adjusting module is configured to adjust the volume of the back sound cavity according to the frequency characteristics of the acoustic signal when powered on. The function of the adjustable back sound cavity is realized, and the acoustic performance of the loudspeaker module for acoustic signals of different frequencies is improved.

This invention proposes a ducted propeller, comprising a tube body, a propeller body, and protruding units. At least one groove is formed on the inner wall of the tube body. The propeller body is disposed within the tube body and located at one end of the tube body. The groove is spirally arranged around the central axis of the tube body. Several protruding units are continuously and uniformly arranged within the groove along its spiral line. Adjacent protruding units are connected end-to-end. By forming a spiral-shaped groove on the inner wall of the tube body, the propeller wake is rectified. As the wake flows towards the outlet at the free end of the tube body, the circumferential velocity component of the wake gradually decreases under the action of the groove. This results in the circumferential velocity component at the wake outlet being significantly smaller than that at the wake inlet, thereby improving propulsion efficiency and reducing noise.

The utility model discloses a miniature loudspeaker, comprising a basin stand, a magnetic circuit assembly, a first vibration assembly, a second vibration assembly and a third vibration assembly, the magnetic circuit assembly is connected with the basin stand, the magnetic circuit assembly is provided with two first magnetic gaps and two second magnetic gaps, the first magnetic gaps are linear, and the second magnetic gaps are annular frame-shaped; the first vibration assembly comprises a first diaphragm assembly and two first voice coils, the two first voice coils are vertically arranged and correspond to the two first magnetic gaps, and the first voice coils move in the first magnetic gaps; the second vibration assembly comprises a second diaphragm assembly and two second voice coils, the second voice coils move in the second magnetic gaps, and the two second voice coils correspond to the two second magnetic gaps; the third vibration assembly comprises a third diaphragm assembly and two third voice coils, the two third voice coils are vertically arranged and correspond to the two first magnetic gaps, and the third voice coils move in the first magnetic gaps and are staggered with the first voice coils. The miniature loudspeaker is novel in structure, good in high pitch effect and excellent in acoustic performance.

The utility model discloses a sounding unit, which comprises a magnetic circuit assembly, a voice coil, a diaphragm assembly and a framework, the magnetic circuit assembly comprises an upper yoke, a lower yoke, a central magnetic structure and an edge magnetic structure, the central magnetic structure and the edge magnetic structure are respectively arranged on the lower yoke, and the upper yoke covers the central magnetic structure and the edge magnetic structure. The magnetic circuit assembly is provided with a magnetic gap, the magnetic gap surrounds the central magnetic structure, the magnetic gap is located between the upper yoke and the lower yoke, the magnetic circuit assembly is provided with a first magnetic loop and a second magnetic loop which are opposite in direction, the first magnetic loop penetrates through the upper portion of the magnetic gap, and the second magnetic loop penetrates through the lower portion of the magnetic gap. The second magnetic loop passes through the lower part of the magnetic gap; the framework comprises an inner mounting part, a connecting part and an outer mounting part which are connected in sequence, the inner mounting part is connected with the voice coil, the outer mounting part is connected with the transition part, a stamping convex hull is arranged on the outer mounting part, and a reinforcing block is arranged in the stamping convex hull. The sound production unit is weak in high-frequency segmentation vibration phenomenon and has high performance.

The utility model discloses electronic equipment, and belongs to the technical field of communication equipment. The disclosed electronic device includes: a housing; the loudspeaker is arranged in the shell, the loudspeaker comprises a loudspeaker main body, and the loudspeaker main body and the shell jointly define a first rear cavity; or, the loudspeaker further comprises a first shell, the loudspeaker body is located in an inner cavity of the first shell, and a first rear cavity is defined by the loudspeaker body and the first shell; and the camera module comprises a second shell, and an inner cavity of the second shell is communicated with the first rear cavity.

A kind of floating construction floor structure for sound insulation and vibration reduction of machine room equipment, the floating construction floor structure includes concrete floor structure layer, sound insulation and vibration reduction layer, waterproof structure layer, floating construction layer in turn from bottom to top distribution, the periphery of concrete floor structure layer is built with surrounding edge structure to form with vibration reduction floating construction installation area, the inner side of surrounding edge structure is pasted with frame isolation strip, sound insulation and vibration reduction layer is fixed in the vibration reduction floating construction installation area above concrete floor structure layer, waterproof structure layer is fixed above sound insulation and vibration reduction layer, floating construction layer is fixed above waterproof structure layer.The utility model can separate sound insulation and vibration reduction layer from building main body by installing frame isolation strip on one side of surrounding edge structure, so that floating construction floor structure plays the maximum acoustic effect, the lower part of floating construction layer is laid with sound insulation and vibration reduction layer, waterproof structure layer layer, can effectively improve the function of concrete structure floor sound insulation, waterproof, dustproof, effectively reduce the vibration frequency generated when equipment runs.

The application discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic energy conversion, wherein the sound production device comprises a magnetic circuit system, a shell, a mesh cloth and a vibration system; the magnetic circuit system comprises a magnetic yoke, a center magnetic circuit arranged on the magnetic yoke and a side magnetic circuit; the side magnetic circuit comprises two side magnets; the magnetic yoke comprises a bottom plate and two side plates connected with the bottom plate; the side magnetic circuit and the side plates are arranged around the periphery of the center magnetic circuit and are spaced apart from the center magnetic circuit to form a magnetic gap; the shell is provided with a communication hole; the mesh cloth covers the communication hole; the mesh cloth and the side plates are spaced apart to form an air flow channel; the air flow channel is connected with an external environment and a cavity on the inner side of the side plate through the mesh cloth; and the vibration system comprises a diaphragm and a voice coil, and the voice coil is arranged corresponding to the magnetic gap. The mesh cloth and the shell are integrally injection molded to realize complete filling; on this basis, the two side plates and the center magnetic circuit form a magnetic loop, the magnetic induction intensity of the magnetic gap is improved, and the acoustic performance of the sound production device is improved.

The utility model discloses a sound unit, including two magnetic cover and two edge magnetic structure, two the magnetic cover is opposite to set up, and at least one the middle part of magnetic cover has the inner flanging, and the inner flanging is located between two the magnetic cover, the edge magnetic structure includes by lower to upper in proper order the lower edge magnetic steel, the edge huasi and upper edge magnetic steel, the lower edge magnetic steel and upper edge magnetic steel are connected different the magnetic cover respectively, the inner flanging is located between two the edge magnetic structure, and the distal end of inner flanging with the edge huasi corresponds. This sound unit has the superiority of high, and has reduced center huasi and at least one center magnetic steel, has realized the reduction of sound unit parts, has facilitated the assembly work of sound unit, is favorable to the promotion of the assembly efficiency of sound unit, reduces the assembly cost of sound unit, and alleviates the total weight of sound unit.

This utility model discloses a sound absorption and noise reduction structure for a vacuum cleaner, including an airflow channel pipe. One end of the airflow channel pipe is snapped into a vacuum cleaner connector. Dust chamber shell one and dust chamber shell two are respectively attached to both sides of the airflow channel pipe. The mating surfaces of dust chamber shell one and dust chamber shell two are snapped into each other, and a handle ring is snapped into the outer side of the dust chamber shell one near the vacuum cleaner connector end, and a limit ring is snapped into the outer side of the dust chamber shell one away from the handle ring end. A dust chamber shell cover is snapped into the top of dust chamber shell one and dust chamber shell two. Heat dissipation holes are opened on the bottom side of each dust chamber shell one and dust chamber shell two, and a motor assembly is fixedly connected inside the corresponding heat dissipation holes. Through the integrated design of airflow channel optimization, vibration isolation, composite noise reduction and efficient heat dissipation, the acoustic performance of the vacuum cleaner is improved while ensuring heat dissipation efficiency and structural reliability, achieving a comprehensive technical effect of low noise and high stability.

The application discloses a manufacturing method of an ultrasonic catheter, the ultrasonic catheter and a forming die thereof. The manufacturing method of the ultrasonic catheter comprises the following steps: preparing an array stack; selecting a lead-out wire; coating a polymer material at a preset distance from one end of the lead-out wire to form a preformed tube; electrically connecting one end of the lead-out wire close to the preformed tube to the array stack; adopting split pouring to manufacture a sound-transparent protective layer coated on the periphery of the array stack and one end of the preformed tube close to the array stack; electrically connecting the other end of the lead-out wire away from the preformed tube to a circuit connector; and forming a Parylene coating layer on the outer surface of the sound-transparent protective layer. The Parylene coating layer enables the sound-transparent protective layer to better adapt to the vascular environment of the human body and meet the requirements for use in blood vessels. Therefore, the selection range of the manufacturing material of the sound-transparent protective layer is wider, and a material with a lower pouring temperature can be selected to manufacture the sound-transparent protective layer, so that the array stack is prevented from being separated due to heat, and the acoustic performance, consistency and qualification rate of the ultrasonic catheter are improved.

The utility model belongs to the technical field of sound energy conversion discloses a kind of sounding device and electronic equipment, sounding device includes shell, magnetic circuit system and vibration system, magnetic circuit system is connected in shell, and magnetic circuit system is equipped with magnetic gap;Vibration system includes diaphragm and the voice coil for driving diaphragm vibration, and diaphragm includes ring folding part, the sealing structure connected in shell and the vibration plate connected in ring folding part;Sealing structure is arranged around ring folding part;Sealing structure includes the abutting portion and the first connecting portion of connection, the included angle between the inside surface of abutting portion and the virtual line extending along second direction is first included angle, the included angle between the outside surface of abutting portion and the virtual line extending along second direction is second included angle, and first included angle is less than second included angle;First connecting portion is connected in ring folding part, and second direction is perpendicular to the axial direction of sealing structure.The utility model has preferable acoustics performance.

The invention provides a sound production device and electronic equipment, and the sound production device comprises a basin frame, a vibration system and a magnetic circuit system. The basin stand is provided with a through hole penetrating through the basin stand; the vibrating system comprises a vibrating diaphragm completely covering the through hole, and a first voice coil and a second voice coil which are used for driving the vibrating diaphragm to vibrate along a first direction; the vibrating diaphragm comprises an elastic fixing part, two through holes and two spherical roofs; each dome comprises a first long-axis edge, a first short-axis edge, a second long-axis edge and a second short-axis edge which are sequentially connected end to end, and the first short-axis edge and the second short-axis edge are of an asymmetric structure relative to the connecting line of the midpoint of the first long-axis edge and the midpoint of the second long-axis edge; the first long-axis edges of the two dome tops are located on the same straight line, the second long-axis edges of the two dome tops are located on the same straight line, and the second short-axis edge of one dome top is adjacent to the second short-axis edge of the other dome top. The acoustic performance of the sound production device can be improved.

The application provides an acoustic material, a manufacturing method thereof, a loudspeaker and electronic equipment, wherein the acoustic material is formed by interweaving hydrophilic fibers with each other, has a three-dimensional network structure inside, and has porous powder materials attached to the surfaces of the hydrophilic fibers through a precipitation aid, the hydrophilic fibers include hydrophilic natural fibers and / or hydrophilic modified chemical synthetic fibers. The acoustic material has high efficient acoustic performance, and the acoustic performance of the porous powder material with the acoustic enhancement function per unit mass is better than that of commonly used acoustic enhancement particles on the market. The acoustic material also has stable acoustic performance, and after high-temperature and high-humidity storage according to the technical content recorded in 7.8.4 of the group standard 'Porous sound-absorbing particles for micro loudspeakers' (standard number: T / CECA 78-2022), the acoustic performance of the acoustic material has no loss.

The utility model discloses a sound production device and vehicle relates to electric sound transduction technical field, this sound production device is applied to vehicle, sound production device includes sound barrier board, support spare and loudspeaker, sound barrier board is equipped with air hole, be equipped with the cavity in support spare, support spare has the top and bottom that are connected, bottom with sound barrier board is connected to make the cavity with air hole intercommunication, loudspeaker is located in the cavity, and with top is connected. The utility model aims at canceling the traditional box structure, reduces the space of sound production device occupation vehicle inside, expands the low frequency lower limit of sound production device simultaneously, promotes the acoustics performance and low frequency of sound production device and dives ability.

This application discloses a sound-generating device and a sound-generating module. The sound-generating device includes a housing, a magnetic circuit system, and a vibration system. The housing has a first sound outlet. The magnetic circuit system has a magnetic gap. The vibration system includes a first diaphragm, a second diaphragm, an intermediate diaphragm, and a voice coil. The first diaphragm is disposed on the side of the housing away from the magnetic circuit system, the second diaphragm is disposed on the side of the first diaphragm facing the magnetic circuit system, and the intermediate diaphragm is disposed between the first and second diaphragms. The voice coil is at least partially disposed in the magnetic gap and is connected to the first diaphragm. The second diaphragm and the intermediate diaphragm are located outside the voice coil. The outer edges of the second diaphragm and the intermediate diaphragm are connected to the housing, and the inner edges of the second diaphragm and the intermediate diaphragm are connected to the first diaphragm. A sealed second sound-generating cavity is formed between the second diaphragm and the intermediate diaphragm, and the second sound-generating cavity is connected to the first sound outlet. The effective vibration area of ​​the intermediate diaphragm is smaller than the effective vibration area of ​​the second diaphragm.

The application provides a sheet-shaped FER molecular sieve with controllable thickness and a preparation method and application thereof. The preparation method comprises the following steps: mixing an alkali source, a silicon source, an aluminum source, deionized water, a mineralizing agent, a template agent and a growth regulator to obtain a raw material mixture; performing a hydrothermal crystallization reaction on the raw material mixture; and performing water washing, drying and calcination on a product to obtain the sheet-shaped FER molecular sieve; and the growth regulator is n-propylamine or tetramethylammonium hydroxide. The preparation method can prepare a sheet-shaped FER molecular sieve with a high silicon-aluminum ratio and a thickness of 0.2-5 microns by adjusting the proportion of the growth regulator, and the synthesized sheet-shaped FER molecular sieve has the characteristics of high crystallinity and large specific surface area. An acoustic enhancement material is prepared by using the sheet-shaped FER molecular sieve with controllable thickness as a raw material, and the acoustic performance of a loudspeaker back cavity equipped with the acoustic enhancement material can be greatly improved.

This invention proposes an annular propeller, belonging to the field of annular propellers, comprising a hub shell, a front blade, a rear blade, and a rotor. The front and rear blades are offset along the axial direction of the hub shell and are disposed on the outer peripheral wall of the hub shell. The front and rear blades are connected at their tips to form an annular blade. The rotor is fitted onto the outer peripheral wall of the hub shell and rotates axially relative to the hub shell. The root of the front or rear blade is disposed on the rotor, and the front or rear blade rotates with the rotor, changing the outward tilt angle of the annular blade. This invention, by setting an axially rotatable rotor on the outer peripheral wall of the hub shell and placing the root of the front or rear blade on the rotor, allows the blade root to move circumferentially when the rotor rotates relative to the hub shell, thereby changing the relative offset angle of the front and rear blades in the axial direction and achieving adjustment of the outward tilt angle of the front and rear blades.

The application discloses a kind of low-frequency broadband sound-absorbing metamaterial structures and super-constructed sound barriers based on metal foam, and the metamaterial structure includes metal foam layer and composite resonant cavity layer, and the metal foam layer and the composite resonant cavity layer are stacked;Composite resonant cavity layer includes mother cavity structure and sub-cavity structure, and the sub-cavity structure is embedded in the mother cavity structure, and the mother cavity structure and the sub-cavity structure are all provided with openings towards the metal foam layer, so that the incident sound wave can enter the mother cavity structure and the sub-cavity structure after propagating through the metal foam layer;The cavity of mother cavity structure and sub-cavity structure is unidirectional equal-section cavity.The application is applied to the field of acoustic noise reduction, realizes the high-efficiency sound-absorbing performance of low frequency and wide band, has high stiffness and strength and excellent environmental adaptability, can bear, has good environmental tolerance, has excellent fireproof performance, is suitable for various complex and severe environments, ensures long-term stable working state, is convenient for low-cost mass production, and improves economic feasibility.

The utility model discloses a sounding unit, including magnetic circuit subassembly, current-conducting plate, centering disk and vibration subassembly, magnetic circuit subassembly includes support portion, yoke, and central magnetic structure and side magnetic structure that are respectively provided on the yoke, side magnetic structure is provided around central magnetic structure, central magnetic structure includes central magnetic steel and central washer, the central magnetic steel is connected with the central washer and the yoke, the yoke is provided with a first window, the central washer is provided with a hollow window, the central magnetic steel is provided with a through hole communicated with the hollow window and the first window, and the supporting part is located in the hollow window and connected with the central magnetic steel; the conductive plate comprises an inner mounting part, a connecting part and an outer mounting part which are connected in sequence, the inner mounting part is fixed on the top surface of the supporting part, the connecting part penetrates through the through hole, the outer mounting part is fixed on the bottom surface of the central magnetic steel and is exposed through the first open window, an upper bonding pad is arranged on the inner mounting part, and a lower bonding pad conducted with the upper bonding pad is arranged on the outer mounting part; the sound production unit has the advantage of high acoustic performance.

This utility model discloses a green and eco-friendly composite wood flooring, comprising a core layer, a surface layer above the core layer, a bottom layer below the core layer, an environmentally friendly reinforced composite layer between the core layer and the bottom layer and laminated together using an environmentally friendly adhesive, and a composite self-locking noise-reducing connection structure located at the edge of the core layer. The composite self-locking noise-reducing connection structure includes an elastic barbed tongue and groove, a corresponding groove, and an embedded flexible shock-absorbing and noise-reducing strip within the main locking groove. This utility model, through the introduction of the environmentally friendly reinforced composite layer and innovative connection structure design, solves the problems of loose joints, noise transmission, insufficient environmental performance, and poor flatness retention after installation in existing composite flooring, providing a high-performance and environmentally friendly floor decoration material.

This utility model discloses a uniformly vented dual-magnetic-circuit moving-coil loudspeaker, including a frame, a diaphragm voice coil mounted on the top of the frame, a partition assembly mounted on the bottom of the frame's inner cavity, and a resonant cavity on opposite sides of the frame and partition assembly. A partition vent hole is circumferentially formed on the partition assembly, and a frame vent hole is circumferentially formed at the bottom of the frame. This utility model has the advantage of uniform venting, solving the problem that existing moving-coil loudspeakers, during use, do not easily and smoothly expel air from the speaker's interior, and when the diaphragm's vibration amplitude is too large, it easily causes unbalanced diaphragm vibration due to impeded air expulsion.

The application discloses a bone conduction earphone, which comprises two earphone heads (1), two warehouse bodies (2), ear hanging lines (3) connected between the earphone heads (1) and the warehouse bodies (2), and neck wearing lines (4) connected between the two warehouse bodies (2). When the neck wearing line (4) is in a horizontal state, the warehouse body (2) extends vertically downward or extends downward and inclines toward the side where the earphone head (1) is located. In the application, the center of gravity of the warehouse body is closer to the fulcrum where the ear hanging line contacts the ear, the center of gravity of the whole bone conduction earphone is closer to the front, the tendency of the bone conduction earphone to swing around the fulcrum during movement is inhibited, the swing amplitude is reduced, the bone conduction earphone is more stable and reliable when worn on the head, and the use experience is better.