33results about "Electrets selectrostatic transducer" patented technology

Charged polymeric webs, such as electret webs, include a thermoplastic resin and a charge-enhancing additive. The additives are substituted heterocyclic thiolate salts. The heterocyclic thiolate salt has 2 nitrogen groups and a third group that may be an NH, N—NH2, O, or S group. The substituent group is an aromatic or heterocyclic aromatic group. The electret webs may be a non-woven fibrous web or a film. The electret webs are suitable for use as filter media.

The invention provides an MEMS acoustic sensor and a use method thereof, and the MEMS acoustic sensor comprises a packaging structure which is internally provided with a light generation assembly, an acoustic vibration device and a light sensing assembly. Wherein the acoustic vibration device is used for pickup and vibration; moreover, in the vibration process of the acoustic vibration device, light emitted by the light generation assembly is reflected by the acoustic vibration device and then irradiates different sensing positions on the light sensing assembly, and the light sensing assembly generates corresponding electric signals based on the irradiated sensing positions. The MEMS acoustic sensor can solve the problem that an existing MEMS acoustic sensor is low in sensitivity.

Provided is an electrode layer-forming composition, a laminate body, uses thereof, and a production method thereof, which can form an electrode layer having viscoelastic properties sufficient for practical use, which can be coated with a hot-melt process, which has excellent adhesion to a dielectric layer, conformability, and shape retention properties to the resulting electrode layer, and which is unlikely to cause problems such as peeling or defects in the electrode layer even when used in a transducer. A hot-melt electrode layer-forming organopolysiloxane composition contains: (A) a linear organopolysiloxane; (B) an MQ type organopolysiloxane resin having a weight average molecular weight of 5000 or more in terms of a polystyrene standard; and (E) conductive fine particles. The composition is non-fluid at 25° C. and has heat melting properties. The amount of component (B) in the composition is 45 mass % or more relative to the entire composition.

Described herein are thermoplastic core-sheath fibers. The thermoplastic core-sheath fibers include a core having a coextensive sheath layer disposed thereon, the core including a first polymeric resin and a charge-enhancing additive, and the sheath layer including a second polymeric resin, with the proviso that when the second polymeric resin includes poly(4-methyl-1-pentene), the second polymeric resin does not include 100% by weight of poly(4-methyl-1-pentene). These thermoplastic core-sheath fibers can be used in filtration applications.

The utility model belongs to loudspeaker technical field discloses a kind of electrostatic loudspeaker and electronic equipment, electrostatic loudspeaker includes shell, first polarity structure, second polarity structure, vibration structure. First polarity structure is equipped with at least one, first polarity structure is set in shell;Second polarity structure is equipped with at least one, second polarity structure is set in shell, and second polarity structure and first polarity structure are along first direction vibration structure alternately arranged;When one of the two of first polarity structure and second polarity structure includes electrode layer, the other of the two includes electret layer;First direction vibration structure is the thickness direction of shell;Vibration structure is set in shell, and vibration structure is conductor;The inner periphery of vibration structure is connected to second polarity structure, and the outer periphery of vibration structure is connected to shell. The electrostatic loudspeaker and electronic equipment provided by the utility model have long service life.

The application relates to the technical field of microphones, in particular to a pre-stage amplification circuit, an electret microphone and a vehicle. The pre-stage amplification circuit comprises one end of a time division duplex filter used for connecting the electret microphone, and the other end of the time division duplex filter used for connecting the base of an emitter follower through a high-pass filter; the emitter of the emitter follower is used for connecting a post-stage processing unit through a magnetic bead filter; the time division duplex filter is used for performing first filtering and second filtering on original audio signals collected by the electret microphone to obtain first audio signals; the high-pass filter is used for performing third filtering on the first audio signals to obtain second audio signals; and the emitter follower sends the amplified second audio signals to the post-stage processing unit through the magnetic bead filter. The application adopts a common emitter follower to amplify signals, has low cost, can eliminate TDD interference, and has high performance.

Microelectromechanical (MEMS) microphones with diaphragm trench stiffeners and methods of manufacture are provided. The MEMS microphone includes a flexible plate and a rigid plate mechanically coupled to the flexible plate. The MEMS microphone includes a stop member secured to the rigid plate and extending perpendicularly relative to a surface of the rigid plate opposite a surface of the flexible plate. The stop member limits movement of the flexible plate. The rigid plate includes a reverse bend edge including a first lateral etch stop including a first corner radius and a second corner radius. The first corner radius is greater than 100 nanometers and the second corner radius is greater than 25 nanometers. Further, a lateral step width between the first corner radius and the second corner radius is less than about 4 microns.

This invention relates to an apparatus for differentially driving an electrostatic drive unit of a microelectromechanical sound-generating device implemented in a microelectromechanical system (MEMS). The drive unit has a movable element having a first electrode, which is electrostatically drivable by a second electrode and a third electrode of the drive unit.

The present disclosure provides a flexible electrostatic electroacoustic transducer having a pair of opposing conductive layers and a dielectric layer disposed between the pair of opposing conductive layers, wherein the dielectric layer has a Young's modulus of 0 to 0.3 GPa and a thickness of 0 to 500 μm.

The utility model belongs to loudspeaker technical field discloses a kind of loudspeaker and electronic equipment, and loudspeaker includes shell and sounding unit, and the shell wall of shell is provided with first sound outlet;Sounding unit is equipped with second sound outlet, and second sound outlet is communicated with first sound outlet;Sounding unit includes fixed assembly, at least one diaphragm, at least one first polarity structure and at least one second polarity structure;Fixed assembly is installed in shell, and diaphragm is conductive structure, and diaphragm is correspondingly arranged with first polarity structure, and diaphragm is connected between fixed assembly and corresponding first polarity structure, and first polarity structure and second polarity structure are alternately arranged along first direction, and second polarity structure is equipped on both sides of first polarity structure;When one of first polarity structure and second polarity structure includes electrode layer, the other of both includes electret layer.The loudspeaker and electronic equipment provided by the utility model have good acoustic effect and long service life.

The invention relates to an electromechanical system comprising: - a frame; - a movable element (13) relative to the frame, the movable element comprising a membrane (131) and a membrane stiffening structure (132); - capacitive means for measuring or actuation; - a first transmission device (14a) for transmitting movement between the movable element (13) and the measuring or actuation means, the first transmission device (14a) being rotationally movable relative to the frame by means of a plurality of first pivot joints (16a); system in which: - a first opening (134) is provided in the movable element (13); - the frame comprises a first island (110) extending inside the first opening (134); and - the first transmission device (14a) is connected to the first island (110) via one of the first pivot joints (16a).

The utility model discloses an electret microphone, which relates to the field of microphones and comprises a shell, a supporting block fixedly connected to the left side of the shell, a rotating rod movably connected to the inside of the supporting block, a baffle fixedly connected to one side of the rotating rod, a clamping hole formed in the baffle, a connecting block fixedly connected to the position, close to the supporting block, of the left side of the shell. An adjusting groove is formed in the connecting block, and a telescopic rod is arranged in the adjusting groove; compared with the prior art, the microphone has the advantages that the connecting port can be protected through the connecting block, the telescopic rod, the spring, the clamping rod, the baffle and other assemblies, dust and other impurities are effectively prevented from entering the microphone, normal use of the microphone is ensured, and meanwhile the service life of the microphone can be prolonged; the circuit board can be quickly assembled and disassembled through assemblies such as a clamping ring, a clamping ring, a threaded sleeve and a threaded column, so that the circuit board can be overhauled after being used for a long time, and meanwhile, the overhauling difficulty can also be reduced.

An earphone includes a housing that is connected with a nozzle for emitting sound to the outside, a fixed pole that is fixed inside the housing, a diaphragm that is provided so as to divide a space inside the housing into two, and vibrates in accordance with a potential difference generated between the diaphragm and the fixed pole facing each other, a support part that supports the diaphragm such that a portion of the diaphragm is in contact with the fixed pole, and an adjustment hole that is formed so as to penetrate a wall of the housing on a side opposite to the one having the nozzle, from the perspective of the diaphragm, and adjusts a pressure inside the housing. A through-membrane hole penetrating the diaphragm is formed in the portion of the diaphragm.

An electret capacitor sensor includes: an insulated electrode including a first electrode and an insulating layer; and an electret electrode including a second electrode and an electret layer and arranged such that the electret layer and the insulating layer face each other. The insulating layer includes, on an opposite surface facing the electret layer, protruding parts and bottom parts other than the protruding parts, and the electret electrode is formed having undulations corresponding to the protruding parts and the bottom parts of the insulating layer.

The present disclosure relates to an electret condenser microphone (1000), comprising: a case (10) comprising a case bottom (102) and a circumferential wall (104), wherein the case (10) is configured for grounding; a PCB assembly (20), comprising a PCB substrate (22) having a top side (22a) and a bottom side (22b); a diaphragm (30) and a back plate (40), wherein the back plate (40) is electrically conductive and communicatively connected to the PCB assembly (20); wherein the PCB assembly (20), the diaphragm (30) and the back plate (40) are arranged in the case (10), and contacts (282) for connecting to a power supply are arranged on the top side (22a) of the PCB substrate (22), and a field effect transistor (284) is arranged on the bottom side (22b) of the PCB substrate (22), and wherein a shielding layer (24) is arranged between the top side (22a) and the bottom side (22b) to eliminate power frequency interference.

The application discloses a pickup acoustic structure and relates to the technical field of pickups. The pickup acoustic structure comprises a microphone array, a shell and a first waterproof mesh cloth. The microphone array is arranged on a mounting plate and comprises a plurality of microphones. The mounting plate is provided with sound inlet holes penetrating through the mounting plate corresponding to each microphone. The shell has a side wall, an upper port and a lower port. The side wall encloses a cavity. The upper port is connected to one side surface of the mounting plate. The lower port is communicated with the outside world. The lower port is covered with a mesh cover. The first waterproof mesh cloth covers the lower port of the shell. The mesh cover can block the air flow speed to some extent. The cavity is arranged to increase the air travel distance into the sound inlet hole, so that the wind noise reduction effect is better. The first waterproof mesh cloth forms the first line of defense to prevent water from the outside world into the pickup. The cavity has a certain thickness, which can further increase the water travel distance into the sound inlet hole, so that the pickup has excellent waterproof effect.

The present invention relates to a micro-electromechanical transducer comprising one or more moveable members, and a viscoelastic substance having a predetermined viscoelasticity, wherein the one or more moveable members are configured to provide stretch or shear to the viscoelastic substance, and wherein the viscoelasticity of the viscoelastic substance is selected so as to damp a resonance peak of the transducer in a predetermined manner.

Provided is an electrode layer-forming composition, a laminate, use thereof, and a manufacturing method thereof, which can be used in a substantially solvent-free process, is applicable to a variety of processes including an electrode printing process, can achieve a solvent-free electrode layer, has remarkably excellent adhesion to a dielectric layer, conformability, shape retention, is unlikely to cause problems such as peeling of the electrode layer or defects even when used in a transducer, and can form an electrode layer having viscoelastic properties sufficient for practical use. An electrode layer-forming curable organopolysiloxane composition, contains: a curable reactive organopolysiloxane; and (E) conductive fine particles. The sum of the amount of organic solvent in the entire composition is less than 0.1 mass %.

A microphone includes a transducer element formed of a permanently charged, cellular ferroelectret film with electrodes on opposing surfaces. The transducer is mounted directly against a rigid support surface, eliminating the traditional air gap found in electret microphones. This configuration allows the microphone to withstand very high sound pressure levels without distortion. The support surface or housing is made of acoustically neutral material, such as polyurethane with Shore 90A hardness, to prevent tonal coloration caused by structural resonance. In one embodiment, the transducer structure is fabricated from a single sheet of ferroelectret film with printed electrodes on both sides, folded along perforated lines to create a compact, EMI-shielded unit. The design simplifies production by eliminating multi-layer laminations and reducing component count, while maintaining high signal fidelity. The microphone is especially suited for musical instruments and other high- SPL applications requiring accurate sound reproduction.

An electro-acoustic transducer includes: a housing, a partition member disposed inside the housing, a first electro-acoustic conversion unit, and a second electro-acoustic conversion unit. The first electro-acoustic conversion unit includes a fixed electrode, a vibrating membrane, and a support member that supports a partial region of the vibrating membrane and brings a part of the vibrating membrane in contact with the fixed electrode. The first electro-acoustic conversion unit and the second electro-acoustic conversion unit are disposed facing each other across the partition member so that a sound emitting part and a sound emitting part communicate with an acoustic outlet, and the partition member supports the support member and the support member.

An electret microphone is provided. It comprises an electrically conductive membrane and a counter-electrode having at least one first hole at a first distance from an edge of the counter-electrode, and a second plurality of second holes each at a second distance from the edge. The second distance is shorter than the first. The microphone includes a first electrically conductive coating on a first side of the counter-electrode and a second electrically conductive coating on a second side. The at least one first hole comprises a via to electrically contact the first and second coatings. A third distance is provided between the second holes and the first coating so that the first coating does not extend to the second holes. The microphone further comprises a polarizable film extending completely over the first coating while leaving the first and second holes free, and extending to the second holes.

The invention relates to the technical field of electro-acoustic conversion, and discloses an improved low-noise electret microphone power supply circuit and audio equipment. The power supply circuit comprises a power input end, a reference voltage generation module and a differential operational amplifier module. An in-phase input end of the differential operational amplifier module is connected to a power supply input end through a first RC filter network, and receives a reference voltage VREF to set an output direct current level; the inverting input end is connected to the power supply input end through a second RC filter network, and the network is configured to isolate the direct current component and couple the power supply alternating current ripple component to the inverting end. Through the unique configuration, power supply ripples serve as common-mode signals to be led into the two input ends of the operational amplifier, effective suppression is carried out through the high common-mode rejection ratio characteristic of the operational amplifier, and finally pure low-ripple direct-current voltage is output to supply power to the electret microphone sensor. According to the invention, excellent power supply noise suppression is realized through a low-cost and small-size scheme, and the audio acquisition quality is remarkably improved.

This electroacoustic converter 2 comprises a casing 20, a partition member 30 disposed inside the casing 20, a first electroacoustic conversion unit 100, and a second electroacoustic conversion unit 200. The first electroacoustic conversion unit 100 has a fixed electrode 101, an oscillation film 105 that is disposed facing the fixed electrode 101 and that oscillates in accordance with a difference in potential generated with respect to the fixed electrode on the basis of an electrical signal, and a support member 107 that supports a partial region of the oscillation film 105 and that brings part of the oscillation film 105 into contact with the fixed electrode 101. The first electroacoustic conversion unit 100 and the second electroacoustic conversion unit 200 are disposed facing one another with the partition member 30 sandwiched therebetween such that a sound-emitting part 100a and a sound-emitting part 200a are inserted into an acoustic outlet 2a. The partition member 30 supports the support member 107 and a support member 207

The utility model discloses an efficient device for coating FEP film on electret microphone, which comprises a support table, a rear polar plate clamp, a heating module, a distance module and a vacuum module, an inner cavity is arranged in the support table, the rear polar plate clamp is arranged on the support table, and the distance module is arranged in the inner cavity. At least one through hole and a rear polar plate fixing groove are formed in the rear polar plate clamp in a combined mode, the through hole and the vacuum module are both connected with the inner cavity, and the distance fixing module is used for extruding a rear polar plate fixed to the rear polar plate clamp. The utility model aims to solve the technical problems in the prior art, and provides the efficient device for laminating the FEP thin film on the electret microphone, which can directly press and paste the FEP thin film without generating wrinkles and bubbles, and ensures that the thicknesses of the pasted films are the same.

An earphone assembly including an electrostatic acoustic device. An audio signal is input to the electrostatic acoustic device. The membrane of the electrostatic acoustic device is configured to respond mechanically to a vaiying electric field responsive to an audio signal at the audio signal input. A detector is configured to detect a time-dependent displacement of the membrane responsive to an external stimulus on the housing and to issue a command in accordance with the detected time-dependent displacement of the membrane and the corresponding external stimulus.

An object of the present disclosure is to provide, for example, a fluoropolymer electret material with hardness. The present disclosure relates to an electret material comprising a fluoropolymer, wherein the fluoropolymer comprises, as a main component, a monomer unit represented by formula (1): wherein R1 to R4 are each independently a fluorine atom, a fluoroalkyl group, or a fluoroalkoxy group; and the fluoropolymer has a mass average molecular weight of 1 million or more and 5 million or less, or 5000 or more and less than 20000.