94results about How to "Improve acoustic performance" patented technology

The invention relates to the technical field of sound effect optimization, and discloses a sound effect optimization method and device based on a coaxial loudspeaker echo wall sound box, and the method comprises the steps: carrying out the acoustic response measurement and acoustic feature analysis of the coaxial loudspeaker echo wall sound box, and obtaining a frequency domain acoustic response characteristic curve; performing acoustic partition calculation on the internal space of the coaxial loudspeaker echo wall sound box to obtain a spatial arrangement parameter of an acoustic processing unit; carrying out acoustic center positioning calculation on the coaxial loudspeaker to obtain a space coordinate parameter and an axial inclination angle parameter of the coaxial loudspeaker; carrying out sound reflection angle calculation and material combination optimization on the inner wall structure of the echo wall sound box to obtain an inner wall geometric curvature parameter and a box body material lamination parameter; sound pressure level frequency response curve analysis and sound phase positioning precision measurement are carried out on the inner wall geometric curvature parameters and the box body material lamination parameters, sound box acoustic performance verification data are obtained, the uniformity of the sound field in the sound box is guaranteed, and then the acoustic performance of the sound box is improved.

The invention relates to the technical field of sound-absorbing materials, in particular to a foaming sound-absorbing material with a high aperture ratio structure and a preparation method and application thereof.The foaming sound-absorbing material comprises one or more of polylactic acid, poly (adipic acid) / butylene terephthalate and polyhydroxyalkanoate, the density of the foaming sound-absorbing material is 0.04-0.08 g / cm < 3 >, and the porosity of the foaming sound-absorbing material is 20-30%. The aperture ratio of the foaming sound absorption material is higher than 60%. According to the invention, the polymer foaming sound absorption material with high aperture ratio can be prepared without adding other fillers and assistants, the prepared foaming sound absorption material has the characteristics of high aperture ratio, small density and the like, and the foaming sound absorption material can realize efficient absorption of sound waves in a thickness range of 10 mm.

The invention discloses a method for manufacturing an injection-molded receiver net plastic part, which comprises the following steps of: heating and melting a polymer melt through a feeding structure, injecting the polymer melt into a mold to obtain the receiver net plastic part, and quickly cooling a sound outlet hole of the receiver net plastic part by adopting preset high-temperature circulating liquid cooling in a first cooling stage through dynamic cooling treatment; the rigidity of the micropore area is effectively improved, the problem of micropore structure deformation caused by non-uniform cooling is reduced, polymer melt in the sound outlet hole area can be cured in time through rapid cooling, excessive shrinkage is avoided, and therefore the total shrinkage rate of the sound outlet hole is remarkably reduced; and in the second cooling stage, cold air is sprayed at the preset low temperature to slowly cool the outer surface of the receiver net plastic part, the toughness of the outer layer structure is enhanced, the differentiated cooling modes are accurately regulated and controlled according to different requirements of the inner and outer structures of the receiver net plastic part, uniform distribution of the shrinkage rate in the whole cooling process is achieved, and the product quality is improved. The problem that the overall shrinkage rate is too large due to a traditional cooling mode is effectively solved.

The invention belongs to the technical field of indoor acoustic effects, and discloses a sound reflecting plate structure for an indoor ceiling and a mounting method of the sound reflecting plate structure. A top plate; the first lap joint edge and the second lap joint edge form a lap joint seam, the surface modeling of the spherical panel is of a water ripple mechanism, and the spherical panel is used for reflecting transmitted sound waves and diffusing the sound waves in a divergent mode; the lapped seam is filled with the first filling material, so that the spherical plate is matched with the top plate to wrap the frame; the spherical plate, the top plate and the first filling material are all made of GRG materials. The sound reflecting plate is designed into a unique water ripple mechanism shape and a specific curved surface subjected to acoustic calculation, and the GRG material with more excellent acoustic performance is adopted, so that the sound field strength is improved, the low-frequency absorption is relatively small, the reverberation time and the sound surrounding feeling in the auditory hall are improved, and the sound quality of the auditory hall is improved. And the early-stage reflected sound and the later-stage reflected sound are balanced, so that a pure natural sound environment is realized.

The invention discloses a sound production device, a sound production module and electronic equipment, and relates to the technical field of electroacoustic transduction, a magnetic circuit system of the sound production device is provided with a mounting hole penetrating through a magnetic conductive yoke and a central magnetic part, a conductive bracket is arranged in the mounting hole, and a diaphragm assembly of a vibration system comprises a vibration part, a first folding ring part and a second folding ring part, the inner side of the second folding ring part is connected with the conductive support. The two ends of the centering disk are electrically connected with a bonding pad of the conductive support and a lead of the voice coil respectively. Wherein the vibration part is provided with a convex hull part protruding in the direction away from the magnetic circuit system, and a lead of the voice coil is wired along the inner wall of the convex hull part and is electrically connected with the centering disk. According to the sound production device, the magnetic circuit system is arranged in a hollow manner and is provided with the conductive support, and the centering disk is electrically connected with the voice coil and the conductive support respectively, so that the setting volume of the edge magnetic part can be increased, the magnetic field intensity can be improved, and the BL value of a product can be increased, thereby improving the acoustic performance; in addition, the sound production device is low in magnetic flux leakage and meets the use requirements.

The invention relates to a sealing strip and an automobile, and the sealing strip comprises a sealing part and an acoustic metamaterial structure; the sealing part forms an accommodating cavity; the acoustic metamaterial structure is arranged in the accommodating cavity; the acoustic metamaterial structure comprises a cavity structure and an acoustic metamaterial unit arranged on one side of the cavity structure; wherein the cavity structure is provided with a resonant cavity, and the resonant cavity is provided with a first opening close to the acoustic metamaterial unit; the acoustic metamaterial unit comprises a film and a mass block, the film blocks the first opening of the resonant cavity, and the mass block is arranged on the side, away from the resonant cavity, of the film. The sound insulation and noise reduction capacity of the sealing strip is high.

The present application mainly relates to an earphone, wherein a movement shell is used to contact the user's skin, a transducer device enables the skin contact area of ​​the movement shell to generate bone conduction sound under the action of the transducer device, a diaphragm divides the accommodating cavity into a front cavity and a rear cavity, the movement shell is provided with a sound outlet hole connected to the rear cavity, and the diaphragm generates air conduction sound transmitted to the human ear through the sound outlet hole during the relative movement of the transducer device and the movement shell; the movement shell is provided with a pressure relief hole connected to the front cavity and a sound tuning hole connected to the rear cavity, the pressure relief hole and the sound tuning hole are arranged adjacent to each other, the leakage sound output through the pressure relief hole has a first resonance peak f1, and the leakage sound output through the sound tuning hole has a second resonance peak f2, the peak resonance frequencies of the first and second resonance peaks are respectively greater than or equal to 2kHz, and |f1‑f2| / f1≤60%, thereby making the peak resonance frequencies of the two leakage sounds as close as possible in the frequency band above 2kHz, so as to better cancel each other out and improve the sound leakage problem of the earphone.

The invention discloses a sonar array expansion mechanism, and relates to the technical field of sonar arrays, the expansion mechanism comprises a frame assembly, a transmitting array assembly and a receiving array assembly, the receiving array assembly is a circular tube transducer array, and the receiving array assembly comprises a linear driving mechanism and a plurality of receiving array components; the linear driving mechanism is arranged at the position, close to the top end, in the frame assembly, the multiple receiving array assemblies are distributed on the outer side of the frame assembly in the circumferential direction, and one end of each receiving array assembly is connected with the edge of the top of the frame assembly in a vertical rotating mode. The linear driving mechanism is fixedly connected with a connecting part, and the connecting part can be driven by the linear driving mechanism to move in the axis direction of the frame assembly; and the connecting part is connected with the plurality of receiving array assemblies. The device is simple in structure, reduces the volume ratio of the contraction and expansion mechanism, improves the space utilization rate of the sonar probe, simplifies the transmission relation of the contraction and expansion mechanism, reduces the bending of a signal cable, improves the reliability, and is higher in practicability.

The utility model discloses a half-cavity loudspeaker module, which comprises a module shell, a loudspeaker monomer, sound absorption particles, a breathable separator and a sealing spacer, and is characterized in that the module shell is provided with an opening, a mounting position and a sound outlet hole; the loudspeaker single body is installed at the installation position, the loudspeaker single body divides the internal space of the module shell into a front cavity and a rear cavity, and the front cavity is communicated with the sound outlet hole; the sound-absorbing particles are filled in the rear cavity; the breathable separator is arranged at the opening to prevent the sound-absorbing particles from escaping from the rear cavity through the opening; the sealing spacer is detachably installed on the module shell and seals the opening, and the sealing spacer is located on the side, away from the sound absorption particles, of the breathable spacer. The half-cavity loudspeaker module is filled with the sound absorption particles, the virtual rear cavity is enlarged, the acoustic performance is improved, the sealing spacer can play a role in isolating the outside atmosphere from the rear cavity, and the stability of the performance of the half-cavity loudspeaker module is guaranteed. The whole rear cavity of the half-cavity loudspeaker module is basically filled with the sound-absorbing particles, so that the acoustic performance is greatly improved.

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.

The utility model discloses a sound guide rear seat of a condenser microphone and the condenser microphone, and particularly relates to the sound guide rear seat of the condenser microphone and the condenser microphone comprising the sound guide rear seat, the sound guide rear seat comprises a conical head, a base and two identical connecting parts, the conical head is a rotating body; the base is a hollow cylinder; the conical head and the base have the same rotating central axis; the first end of the base is connected with the conical head, and the second end of the base is connected with the two connecting parts. The condenser microphone is provided with the sound guide rear seat, so that the focusing and diffusion degree and direction of rear incoming sound can be changed, the frequency response characteristic of the condenser microphone can be improved, the directional characteristic can be optimized, the comb filtering effect and the sidelobe phenomenon can be inhibited, howling is reduced, and the condenser microphone has the advantages of simple structure, easiness in assembly, good acoustic performance and the like.

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 invention discloses a preparation method of a wide-temperature-range high-damping metal hollow sphere / polyurethane damping composite material, and relates to a preparation method of a damping composite material. The method comprises the following steps: 1, carrying out surface modification on metal hollow spheres; and 2, preparing the polymer. Compared with pure polyurethane, the prepared wide-temperature-range high-damping metal hollow sphere / polyurethane damping composite material has the advantages that the damping performance is greatly improved, the temperature range is widened, the excellent damping performance and acoustic performance are achieved, the preparation process is simple, the stability is high, and the composite material is suitable for large-area pouring and complex-shape base materials; wide application prospects are realized in the fields of ships, aerospace, vehicles, building materials and the like; after the surface-modified metal hollow spheres are compounded with polyurethane, the damping performance can be greatly improved, the temperature range is widened, the loss factor is increased from 0.45 to 0.85, and the effective temperature range is widened from 59.9 DEG C to 100 DEG C or above.

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 present application mainly relates to an earphone, wherein the movement shell is used to contact the user's skin, the transducer device enables the skin contact area of ​​the movement shell to generate bone conduction sound under the action of the transducer device, the diaphragm divides the accommodating cavity into a front cavity and a rear cavity, the movement shell is provided with a sound outlet hole connected to the rear cavity, and the diaphragm generates air-conducted sound transmitted to the human ear through the sound outlet hole during the relative movement of the transducer device and the movement shell; the movement shell is provided with a pressure relief hole connected to the front cavity and a sound tuning hole connected to the rear cavity, the pressure relief hole enables the front cavity to be connected with the external environment to reduce the blockage of the front cavity to the rear cavity, the sound tuning hole can destroy the high-pressure area of ​​the rear cavity, reduce the wavelength of the standing wave in the rear cavity, and make the peak resonance frequency of the air-conducted sound shift to high frequency; the wavelength of the standing wave in the front cavity is reduced by cooperating with multiple pressure relief holes, so that the peak resonance frequency of the leakage sound output through the pressure relief hole adjacent to the sound tuning hole is shifted to high frequency, so that the leakage sound output through the adjacent pressure relief hole and the sound tuning hole is better coherently canceled.

The present application mainly relates to an earphone, wherein the movement shell is used to contact the user's skin, the transducer device enables the skin contact area of ​​the movement shell to generate bone conduction sound under the action of the transducer device, the diaphragm divides the accommodating cavity into a front cavity and a rear cavity, the movement shell is provided with a sound outlet hole connected to the rear cavity, and the diaphragm generates air conduction sound transmitted to the human ear through the sound outlet hole during the relative movement of the transducer device and the movement shell; the movement shell includes a main shell, an auxiliary shell and an elastic connecting member, the main shell is used to form a skin contact area, the auxiliary shell is connected to the main shell through the elastic connecting member, the vibration system formed by the auxiliary shell and the elastic connecting member has a natural frequency less than or equal to 2kHz, and the earphone forms air conduction sound in a specific frequency band less than the natural frequency, and the air conduction sound output through the sound outlet hole in another frequency band greater than the natural frequency is significantly reduced, so as to use the air conduction sound to supplement the specific frequency band of the bone conduction sound, thereby improving the acoustic expression of the earphone.

The present application mainly relates to a headset, wherein the movement housing is used to contact the user's skin, the transducer device enables the skin contact area of ​​the movement housing to generate bone conduction sound under the action of the transducer device, the diaphragm divides the accommodating cavity into a front cavity and a rear cavity, the movement housing is provided with a sound outlet hole connected to the rear cavity, and the diaphragm generates air conduction sound transmitted to the human ear through the sound outlet hole during the relative movement of the transducer device and the movement housing; the diaphragm body includes an integrally connected first connection part, a folded part, and a second connection part, the first connection part is connected to the transducer device, the second connection part is arranged around the periphery of the first connection part, the second connection part is connected to the movement housing, and the folded part forms a concave area, the half-depth width W1 of the concave area, the spacing distance W2 between the first connection part and the second connection part, 0.2≤W1 / W2≤0.6. The present application forms a corresponding concave area on the diaphragm body, which can increase the deformation ability of the diaphragm along the vibration direction of the transducer device and reduce the influence of the diaphragm on the vibration of the transducer device.

The invention discloses a vibrating diaphragm assembly, a sound production device and electronic equipment. The vibrating diaphragm assembly comprises a ball top part located in the center position and a folding ring part arranged on the outer side of the ball top part in the circumferential direction, the ball top part and the folding ring part at least comprise one crosslinkable high polymer material layer of the same type, the thickness of the ball top part is larger than that of the folding ring part, the crosslinking degree of the ball top part is 50%-100%, and the thickness of the folding ring part is larger than that of the ball top part. And the crosslinking degree of the folding ring part is 0-20%. By controlling different crosslinking degrees of the ball top part and the folding ring part, the requirements of high rigidity of the ball top part and high flexibility of the folding ring part are met. The rigidity of the ball top is high, segmentation vibration is not prone to occurring in the high-frequency vibration process, and high-frequency response is good. The cross-linkable high polymer material layer of the folding ring part does not generate cross-linking or low-degree cross-linking, so that the high polymer material can keep flexibility, and the folding ring part is small in Young modulus and good in low-frequency response.

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 utility model discloses a loudspeaker with adjustable magnetic attraction force. The loudspeaker comprises a loudspeaker single body, a shell and a magnetic piece, the loudspeaker single body comprises a basin frame, and a vibration assembly and a magnetic circuit assembly which are respectively arranged on two sides of the basin frame; a rear sound cavity is arranged in the shell, and a sound outlet communicated with the rear sound cavity is formed in the shell; the loudspeaker unit is arranged on the inner side of the sound outlet, and the vibration assembly covers the sound outlet; the magnetic piece is installed on the shell, located on the side, away from the vibration assembly, of the magnetic circuit assembly and can move relative to the loudspeaker single body to be close to or away from the magnetic circuit assembly. When the magnetic piece moves to the position close to the magnetic circuit assembly, the magnetic piece and the magnetic circuit assembly interact to increase the magnetic attraction force of the loudspeaker, so that the loudspeaker can be stably attracted to a preset position, meanwhile, the magnetic piece increases the magnetic field intensity of the magnetic circuit assembly, and the acoustic performance of the loudspeaker is effectively improved; when the magnetic piece moves to the position far away from the magnetic circuit assembly, the magnetic attraction force of the loudspeaker is weakened, and a user can easily take the loudspeaker.

A protective element for a consumer electronic device provided with at least one port (101) for an acoustic component (104) and a channel (105), where the port (101) or the channel (105) has a protective fabric against intrusion of contaminant particles and water spray. According to the invention, the fabric (25) has meshes (11) of rectangular shape, the sides (12, 13) of which are made of respective threads (26, 27). The fabric forming the protective element of the present invention provides the advantage of providing an increased protective capability against contamination particles compared to prior art square mesh fabrics having comparable air passage and sound transmission characteristics.

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.

The present application mainly relates to an earphone, wherein the movement shell is used to contact the user's skin, the transducer device enables the skin contact area of ​​the movement shell to generate bone conduction sound under the action of the transducer device, the diaphragm divides the accommodating cavity into a front cavity and a rear cavity, the movement shell is provided with a sound outlet hole connected to the rear cavity, and the diaphragm generates air conduction sound transmitted to the human ear through the sound outlet hole during the relative movement of the transducer device and the movement shell, so that the earphone can output bone conduction sound and air conduction sound, thereby improving the acoustic expression of the earphone; the movement shell is provided with a tuning hole connected to the rear cavity, which can destroy the high-pressure area of ​​the rear cavity and reduce the wavelength of the standing wave in the rear cavity, which is manifested as a frequency response curve of the air conduction sound output to the outside of the earphone through the sound outlet hole having a resonance peak, and the peak resonance frequency of the resonance peak when the tuning hole is in an open state is shifted to a high frequency compared with the peak resonance frequency of the resonance peak when the tuning hole is in a closed state, and the offset is greater than or equal to 500 Hz, thereby improving the acoustic expression of the earphone.

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 utility model relates to the technical field of electro-acoustic conversion, and specifically relates to a sounding monomer and a sounding module. The sound production single body comprises a shell, and a magnetic circuit system and a vibration system which are accommodated in the shell, the magnetic circuit system forms at least two annular magnetic gaps which are arranged in parallel, the vibration system comprises a vibrating diaphragm assembly, a voice coil skeleton and at least two voice coils, the vibrating diaphragm assembly is connected to the shell, and the voice coil skeleton is connected to the shell. The voice coil framework is of an integrated structure and is connected to one side, close to the magnetic circuit system, of the vibrating diaphragm assembly; and one end of each voice coil is connected with the voice coil framework, and the other end of each voice coil is inserted into the magnetic gap corresponding to the voice coil in position. Through the skeleton structure, the distortion mode of the diaphragm assembly can be improved, and the sound quality effect of the sound production monomer under large amplitude can be improved.

The invention discloses a sound production device, a sound production module and electronic equipment, and relates to the technical field of electroacoustic transduction, the sound production device comprises a shell, a magnetic circuit system, a conductive support and a vibration system, the magnetic circuit system is provided with a mounting hole penetrating through a magnetic conductive yoke and a central magnetic part, the conductive support is arranged in the mounting hole, and the conductive support and the magnetic conductive yoke are integrally formed through injection molding; one end of a centering disk of the vibration system is electrically connected with a bonding pad of the conductive support, and the other end of the centering disk is connected with the diaphragm assembly and electrically connected with a lead of the voice coil. Wherein the vibrating diaphragm assembly is of an annular structure, the outer side of the vibrating diaphragm assembly is connected with the shell, and the inner side of the vibrating diaphragm assembly is connected with the conductive support. According to the sounding device, the magnetic circuit system is hollow and is provided with the conductive support, and the centering disk is electrically connected with the voice coil and the conductive support respectively, so that the setting volume of the edge magnetic part can be increased, the magnetic field intensity can be improved, the BL value of a product can be increased, and the acoustic performance can be improved; in addition, the sound production device is low in magnetic flux leakage and meets the use requirements.

The invention discloses a polyurethane two-component lightweight foam material and a preparation method and application thereof, and the polyurethane two-component lightweight foam material comprises the following raw materials: a component A and a component B in a weight ratio of 100: 170-200, the component A is prepared from the following components in parts by weight: 10 to 25 parts of polyether polyol I, 10 to 30 parts of polyether polyol II, 10 to 30 parts of polyether polyol III, 1 to 2 parts of a chain extender, 9 to 12 parts of a foaming agent, 0.5 to 1.2 parts of a foam stabilizer I, 0.1 to 0.5 part of a foam stabilizer II, 0.5 to 2 parts of an antioxidant, 0.5 to 1.5 parts of a pore opening agent, 0.4 to 1 part of a catalyst and 5 to 20 parts of a flame retardant; the component B is prepared from the following component in parts by weight: modified diphenylmethane diisocyanate. The polyurethane two-component lightweight foam prepared by the invention is easy to form, resistant to high temperature and aging, capable of greatly reducing the investment of equipment and improving the stability of raw materials, and capable of being widely applied to lightweight composite materials of upper covers of automobile engine cabins.

The present application mainly relates to an earphone, wherein the movement shell is used to contact the user's skin, the transducer device enables the skin contact area of ​​the movement shell to generate bone conduction sound under the action of the transducer device, the diaphragm divides the accommodating cavity into a front cavity and a rear cavity, the movement shell is provided with a sound outlet hole connected to the rear cavity, and the diaphragm generates air conduction sound transmitted to the human ear through the sound outlet hole during the relative movement of the transducer device and the movement shell, so that the earphone can output bone conduction sound and air conduction sound, thereby improving the acoustic expression of the earphone; the movement shell is provided with a plurality of tuning holes connected to the rear cavity, which can destroy the high-pressure area of ​​the rear cavity and reduce the wavelength of the standing wave in the rear cavity, which is manifested as the peak resonance frequency of the resonance peak in the frequency response curve of the air-conducted sound output to the outside of the earphone through the sound outlet hole shifting to a high frequency, and at the same time, the tuning holes that have a relatively large degree of damage to the high-pressure area of ​​the rear cavity are as far away from the sound outlet hole as possible, and the size of the movement shell and the requirements of high-pressure area destruction can also be taken into account.