62results about How to "Guaranteed acoustic performance" patented technology

The invention relates to the electroacoustic technical field, and provides a loudspeaker module and a manufacturing method thereof. The loudspeaker module comprises a case and a single loudspeaker body combined inside the case. The single loudspeaker body comprises a vibrating diaphragm assembly and a magnetic circuit assembly. A front sound cavity and a rear sound cavity are formed between the single loudspeaker body and the case. The case is provided with an elastic part, the elastic part is combined with the end surface of the opening end of the front sound cavity or the rear sound cavity, and the elastic part and the case are of an integrated structure formed in an injection molding mode. By adopting the structure in the loudspeaker module, the process of attaching the elastic part manually is eliminated, the accuracy and the stability of combination of the elastic part are guaranteed, the elastic part does not fall easily, the sealing property between a sound outlet hole of the loudspeaker module and a sound hole of a mobile phone after the loudspeaker module and a terminal electronic product are assembled can be effectively guaranteed, and the acoustic performance is improved. The manufacturing method for the loudspeaker module can solve the technical problems effectively and can be popularized to production for other structures with soft materials or hard materials needing to be injected into other materials.

The invention provides a waterproof flame-retardant paper cone, a speaker and a preparation method of the paper cone. The waterproof flame-retardant paper cone is composed of pulp, the front surface of the waterproof flame-retardant paper cone contains a waterproof agent, and the back surface of the paper cone contains a flame retardant. According to the waterproof flame-retardant paper cone provided by the invention, the suitable pulp is selected, so that acoustic performance and tone of the paper cone are ensured; at the same time, the paper cone is subjected to waterproof treatment and flame-retardant treatment, the front surface of the paper cone is coated with the waterproof agent, the back surface is coated with the flame retardant, so that the usage amount of the flame retardant andthe waterproof agent can be reduced, the weight increment of the paper cone can be effectively controlled within 5% without affecting the paper pulp composition of the paper cone, the problem that effects are affected because a mutual reaction exists when the flame retardant and the waterproof agent are mixed for use is avoided, the flame retardant grade can reach V-0, the waterproof grade can reach IPX-7, and the flame-retardant waterproof effects are excellent; and the paper cone has good effects when used in the speaker, and has wide market prospects.

A preparation method of a micro bubble ultrasound contrast agent coated by a microcapsule relates to a preparation method of a micro bubble ultrasound contrast agent. The invention solves the problems of the instability of a micro bubble contrast agent and the disappearance of acoustic characteristic of a modified micro bubble. The preparation method of the micro bubble ultrasound contrast agent is that: absorbing, standing or centrifuging, cleaning, absorbing once again, standing or centrifuging and cleaning once more; finally the micro bubble ultrasound contrast agent is available. The invention has simple process, mild reaction condition, simple operation, good reproducibility, wild range of application and environment-friendliness, and is applicable to the surface modification of various ultrasound contrast agents and can be easily implemented.

The invention belongs to the technical field of motor vehicle exhaust systems, and particularly relates to a broadband noise reduction muffler. The broadband noise reduction muffler comprises a shell, baffles and cavities, wherein the baffles and the cavities are arranged inside the shell, the baffles include the first baffle, the second baffle and the third baffle which are arranged in sequence, the cavities include the first cavity, the second cavity, the third cavity and the fourth cavity, an air inlet pipe penetrating through the front end face of the shell, the first baffle and the second baffle and an air outlet pipe penetrating through the first baffle, the second baffle, the third baffle and the rear end face of the shell are arranged inside the cavities. The first baffle, the second baffle and the third baffle are provided with a first punching region, a second punching region and a third punching region respectively. The pipe walls, on the first cavity and the second cavity, of the air inlet pipe are provided with a fourth punching region and a fifth punching region respectively. The fourth punching region is sleeved with a first sleeve. The pipe wall, on the second cavity, of the air outlet pipe is provided with a sixth punching region. The sixth punching region is sleeved with a second sleeve. The first sleeve, the second sleeve and the fourth cavity are each internally provided with a sound absorbing material.

The invention discloses a loudspeaker module and a manufacturing method of the same. The loudspeaker module comprises a loudspeaker module shell and a loudspeaker module monomer, the loudspeaker module shell comprises an upper shell and a lower shell and further comprises a middle connection piece, lower shell is provided with a concave portion, the bottom end of the concave portion is provided with a middle connection piece platform, the middle connection piece is fixedly connected with the middle connection piece platform, and middle connection piece is located between the middle connection piece and the loudspeaker monomer. According to the loudspeaker module and the manufacturing method of the same, the middle connection piece is independently arranged between the lower shell and the loudspeaker monomer, and the problem of flowing liquid overflowing does not exist for the middle connection piece, so that interference with a vibration membrane of the loudspeaker monomer cannot occur, and the effective area of the vibration membrane and the acoustic performance of the loudspeaker can be effectively guaranteed; the thickness of the middle connection piece is controllable, and it is beneficial to improve the yield of the loudspeaker and the controllable rate of production.

The invention discloses VR head-mounted equipment. The VR head-mounted equipment comprises an equipment body and a loudspeaker module; the equipment body is provided with an installation groove; the loudspeaker module is detachably arranged in the installation groove; the loudspeaker module and the equipment body are electrically connected; the loudspeaker module comprises a shell and a loudspeaker monomer; the shell is provided with a cavity and a sound outlet for communicating the cavity with an external space; the loudspeaker monomer is arranged in the cavity; a pronunciation hole of the loudspeaker monomer is mutually communicated with the sound outlet; and a rear sound cavity is formed between the loudspeaker monomer and the loudspeaker module. According to the VR head-mounted equipment disclosed by the invention, the loudspeaker module used as an independent component is arranged in the installation groove of the equipment body; and the loudspeaker module is convenient to assemble and replace.

The invention provides a flame-retardant high-damping rubber composition, a preparation method and application thereof. The rubber composition is a non-black rubber composition and comprises the following components in parts by weight: 80-100 parts of butyl rubber, 5-13 parts of a vulcanization system, 40-100 parts of a flame retardant, 4-12 parts of an antioxidant and 10-30 parts of a pigment. According to the invention, by screening the raw materials and compounding the components, the rubber composition has excellent flame retardancy and photooxidative aging resistance on the premise of ensuring the damping property and acoustic property; and the rubber composition is a safe and environment-friendly high polymer material, the flame retardant property of the rubber composition can reachthe V-0 level, no obvious color difference exists under ultraviolet irradiation, the use requirements of loudspeaker rubber edges can be fully met in the aspects of mechanical property, damping property, aging resistance, appearance color and the like, and the rubber composition has a good market application prospect.

The invention discloses a straight-column type lattice enhanced local resonance underwater sound absorption structure, which includes a cell, the cell is of a square-shaped structure, a plurality of local resonators for sound absorption are distributed in the cell periodically, and a plurality of cell arrays are arranged to form the straight-column type lattice enhanced local resonance underwater sound absorption structure. The straight-column type lattice enhanced local resonance underwater sound absorption structure has the excellent sound absorption performance and the good water pressure resistant performance, meanwhile, lightweight design of the underwater sound absorption structure is realized, and the bearing-sound absorption-lightweight multifunctional integrated structure is achieved.

The invention discloses a loudspeaker module and relates to the technical field of electric-acoustic products. The loudspeaker module comprises a shell. A loudspeaker single body is contained in the shell and partitions an inner cavity of the whole module into a front acoustic cavity and a rear acoustic cavity. A speaking area is arranged at the position, corresponding to the front acoustic cavity, of the shell. Micro-holes which communicate the front acoustic cavity with the outside of the module are distributed in the speaking area. The loudspeaker module solves various adverse technical problems caused by screen cloth pasted to a speaking opening of a module in the prior art. The loudspeaker module is good in uniformity and acoustic performance, excellent in dustproof effect, attractive in appearance, high in production efficiency and low in production cost. Meanwhile, research and development and debugging are flexible, and the research and development period is short.

The invention discloses a virtual reality head-mounted device comprising a wearing structure and earphone monomers arranged on both sides of the wearing structure, wherein each earphone monomer comprises a sound cavity and a connection device, a lower end of the connection device is connected with the sound cavity, the earphone monomer further comprises a front and back rotation adjustment component, an upper end of the connection device is rotationally connected with the front and back rotation adjustment component, a rotation axial line is along a left and right direction, and the front andback rotation adjustment component is fixedly connected with the wearing structure. By application of the virtual reality head-mounted device provided by the invention, due to the arrangement of the front and back rotation adjustment component, the connection device can rotate relative to the front and back rotation adjustment component, as the rotating shaft is on a front and back direction, theconnection device swings back and forth to drive the sound cavity connected with the lower end of the connection device to swing back and forth so as to realize the front and back adjustment of the sound cavity. Therefore, different users can perform front and back adjustment on the sound cavity according to needs to satisfy different wearing demands, and the user experience is greatly improved.

The embodiment of the invention provides a sounding device and electronic equipment. The sounding device comprises a vibration system, a magnetic circuit system and a shell; the shell comprises a mounting part having at least one end open and a rear cavity part which is correspondingly arranged on the outer side of a first side wall of the mounting part and is used for forming a rear cavity; the magnetic circuit system and the vibration system are fixed inside the mounting part; and a rear sound hole communicated with a magnetic gap in the magnetic circuit system and the rear cavity is configured in a position, directly facing the rear cavity, of the first side wall. The sounding device provided by the embodiment of the invention can have better performance while satisfying the small sizerequirement.

The invention discloses a microphone temperature characteristic test system, which relates to the field of electro-acoustic products, comprising a sounding device, a microphone to be tested, a standard microphone, a temperature control device, an audio analyzer, a heating sheet and a refrigerating sheet. The temperature control device accurately controls the temperature of the microphone to be measured by controlling the heating plate or the refrigerating plate. Wherein the audio analyzer outputs a test audio electrical signal to the sounding device, At the same time, the microphone and the standard microphone are transmitted to the microphone and the standard microphone to be tested through the sound generate device, and then two audio electric signals are inputted to the audio analyzer respectively according to the audio signals actually received by the microphone and the standard microphone, and the audio analyzer completes the frequency response and distortion test through the audio electric signals inputted by the microphone to be tested; by judging, comparing the received two audio electrical signals, the phase test is completed. Therefore, the invention can accurately control the temperature of the microphone and complete the acoustic performance test.

The embodiment of the present invention provides a sounder including a housing, a vibration system, and a magnetic circuit system. The first end of the housing successively houses and fixes the vibration system and the magnetic circuit system from top to bottom. A rear sound hole is disposed on the magnetic circuit system. The housing includes a first portion corresponding to the vibration systemand the magnetic circuit system, and a second portion extending integrally downward from the first portion beyond the bottom surface of the magnetic circuit system. On the end portion of the second end of the housing, a housing bottom wall is integrally disposed or a lower cover plate is mounted in a split manner. A rear cavity communicating with the rear sound hole is formed among the second portion of the housing, the bottom surface of the magnetic circuit system and the housing bottom wall or the lower cover plate. The technical solution provided by the present invention contributes to miniaturization of a product.

A MEMS microphone, comprising a packaging structure that is enveloped by a PCB substrate (1) and a housing (2), wherein the packaging structure is provided with a MEMS acoustoelectric chip (3) therein, and the PCB substrate (1) is provided with a sound port (11) at a position that is corresponding to the MEMS acoustoelectric chip (3), wherein, the MEMS microphone further comprises a filter (5), wherein the filter (5) is embedded into a back cavity of the MEMS acoustoelectric chip (3), the filter (5) and the PCB substrate (1) have a lateral hole therebetween, and the lateral hole serves as a sound channel that is used by the MEMS acoustoelectric chip (3)to gather sound. The MEMS microphone can prevent gas shock, block the interfering to the MEMS microphone by kinetic particles, keep the acoustic performance of the MEMS microphone, and reduce the packaging size of the MEMS microphone.

The invention discloses an acoustic switch and an in-ear loudspeaker. The acoustic switch comprises a shell, a magnetic ring, a sealing piece, a magnet and a coil, wherein the shell is provided with a gas flow channel which communicates the interior and the exterior of the shell; the magnetic ring is fixed relative to the shell, and the gas flow channel passes through the magnetic ring; the sealing piece comprises a moving part and an elastic part connected between the moving part and the shell, and at least part of the moving part is made of a magnetic conductive material; the magnet and the shell are relatively fixed, and the magnet and the magnetic ring are located on the two sides of the moving part respectively; the coil is electrified to generate a magnetic field for polarizing the moving part; and the moving part is provided with a first position and a second position, the moving part is in magnetic attraction with the magnetic ring to close the gas flow channel at the first position, the moving part is in magnetic attraction with the magnet to open the gas flow channel at the second position, the coil drives the moving part to be switched between the first position and the second position through the magnetic field generated by electrification of the coil. The acoustic switch provided by the invention is beneficial to realizing miniaturization, and is more energy-saving and low in heat productivity.

The invention discloses an amplitude-adjustable miniature loudspeaker, which comprises a loudspeaker single body, central magnetic steel is arranged in the loudspeaker single body, the amplitude-adjustable miniature loudspeaker further comprises an electromagnet assembly arranged outside the loudspeaker single body, and the electromagnet assembly is arranged corresponding to the central magnetic steel. The electromagnet assembly is arranged outside the loudspeaker single body. By adjusting the polarity and the magnetic force of the electromagnet assembly, the magnitude of the overall BL driving force of the vibration assembly of the miniature loudspeaker can be changed, so that the vibration assembly of the miniature loudspeaker can reach the rated amplitude, distortion of the miniature loudspeaker during working is avoided, the acoustic performance of the miniature loudspeaker can be guaranteed, and the user experience is enhanced.

The invention discloses an automobile exhaust main silencer. The silencer comprises a shell in any shape, wherein a first end cover is arranged on one side of the shell, a second end cover is arrangedon the other side of the shell, partition plates are arranged inside the shell, the partition plates comprise a first partition plate, a second partition plate, a third partition plate and a fourth partition plate which are sequentially arranged inside the shell, an inner gas inlet pipe, a left inner core pipe, a left inner gas outlet pipe, a right inner core pipe and a right inner gas outlet pipe are further arranged in the shell, wherein the left inner core pipe 9 and the left inner gas outlet pipe penetrate the first partition plate and the second partition plate respectively, the right inner core pipe and the right inner gas outlet pipe penetrate the third partition plate and the fourth partition plate respectively, a gas inlet pipe support is arranged on the inner gas inlet pipe, thegas inlet pipe support is connected to the second partition plate and the third partition plate, and a second supporting rod is arranged between the first partition plate and the second partition plate. The silencer can effectively solve the problem that an existing silencer cannot effectively reduce low-frequency noise.

A speaker device is provided with a diaphragm (11); an exciter (13) for generating vibration in accordance with an inputted electric signal; and a vibration transmission unit (15), provided between the diaphragm (11) and the exciter (13), for transmitting vibration from the exciter (13) to the diaphragm (11). The loss factor of the diaphragm (11) at 25 DEG C is 1*10-2 or greater, and the specificelastic modulus of the vibration transmission unit (15) is 20 mm2 / s2 or greater.

The invention provides a dustproof sound-transmitting film composite part and a preparation method thereof, wherein the composite part comprises a dustproof sound-transmitting film assembly, a first release film and a second release film, and only one side of the dustproof sound-transmitting film assembly is sticky; the sticky side of the dustproof sound transmission film is bonded with the secondrelease film, and the other side of the dustproof sound transmission film is bonded with the first release film; the bonding strength between the dustproof sound-transmitting film assembly and the first release film is greater than that between the dustproof sound-transmitting film assembly and the second release film, so that the first release film cannot be separated from the dustproof sound-transmitting film assembly in the process of tearing off the second release film; when the second release film is torn off, one side of the dustproof sound-transmitting film assembly has viscosity, so that the dustproof sound-transmitting film assembly can be directly adhered to the MEMS and a traditional dispensing process is not needed; the acoustic performance of acoustic components such as a microphone can be guaranteed, a one-step dispensing process is omitted, and the operation is simpler; and meanwhile, the MEMS is ensured to have a relatively strong dustproof effect.

The invention discloses a hanging structure. The hanging structure is used for hanging a sound absorption wedge or a sound absorber on the top face of a building, the hanging structure comprises a T-shaped back frame, a leveling straight rod, a suspension sliding rail, a safety hook and a damping anti-skid rubber sleeve, wherein the T-shaped back frame is fixedly connected with the top face of thebuilding, the leveling straight rod is horizontally connected to the T-shaped back frame, the suspension sliding rail is fixedly connected to the leveling straight rod, the safety hook is fixed to the base portion of the sound absorption wedge or the sound absorption body, and the damping anti-skid rubber sleeve is sleeved on the safety hook; and the safety hooks and the suspension sliding railsare mutually hooked and combined through respective hook parts to finish the suspension of the sound absorption wedges or the sound absorbers on the top surface of the building. The suspension structure has shockproof, damping and anti-slip functions, can effectively prevent a suspended sound absorption wedge or a suspended sound absorber from falling off, effectively blocks sound and vibration propagation paths formed by rigid connection of the safety hook and the suspension sliding rail, guarantees the acoustic effect, and meanwhile, the safety of the sound absorption wedges or the sound absorbers and equipment and personnel in installation places of the sound absorption wedges or the sound absorbers is ensured.