52results about "Electrets selectrostatic transducer" patented technology

The invention relates to a method for manufacturing a transducer unit (1), in particular a MEMS transducer unit, for converting electrical signals into displacements and / or displacements into electrical signals, in which at least one transducer element (3) is arranged on a carrier element (2), and the transducer element (3) is coupled to a membrane unit (5) that is deflectable along a stroke axis (H). According to the invention, to form at least one flexible membrane element (14), a flowable and curable membrane material is cast at least section by section onto a reinforcement element (4) of the membrane unit (5) that is coupled or can be coupled to the transducer element (3), so that the membrane element (14) together with the reinforcement element (4) at least partially forms the membrane unit (5). The invention further relates to the transducer unit (1).

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.

A system comprising sound wave sensors for high fidelity sound wave detection from any 3D directions and identification of 3D coordinates of sound sources, means to separate the sound emanations of each sound source with good to high fidelity, and means to reconstruct sound sources with good to high fidelity generally including its lobal patterns. The system enables microphones systems capable of detecting sound with substantially high linearity in frequency response, sensitivity, and directionality, combined with any desired form of volumetric sensing such as spherical, hemispherical, conic and so forth, including multiple defined lobes, or selecting any desired volume and shape. Sound wave sensors can comprise a multitude or combinations of system means such as sound beams, levitated bubble interactions, tethered bubble interactions, fibre interactions, laser interferometry, RF tuned circuit techniques, and so forth, wherein all such methods ultimately employ a form of bidirectional sound sensing means.

Magnetic field cancelling audio systems and associated devices are disclosed. In one embodiment, an audio system with two electromagnetic audio drivers positioned and electrically connected to reduce emitted magnetic fields over a range of predefined frequencies.

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 embodiment of the invention relates to the technical field of semiconductor devices, and discloses an MEMS microphone, and the microphone comprises a substrate which is provided with a back cavity; a diaphragm disposed over the back cavity and attached to the substrate; the vibrating diaphragm comprises a main diaphragm and an additional material layer, wherein the yield strength of the additional material layer is greater than that of the main diaphragm; the additional material layer comprises a first main body part and N beam structures connected with the first main body part and the substrate; the main film comprises a main body sensing part and M conductive parts connected with the main body sensing part, and the values of N and M meet the condition that N is greater than M; at least part of the first main body part and the main body sensing part are fixedly arranged in a stacked mode, the single conductive part is stacked on the single beam structure, and the conductive part is used for enabling the main body sensing part to be electrically connected with an external circuit. According to the arrangement, the whole vibrating diaphragm can be firmer, so that a firmer and more stable MEMS microphone is formed.

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.

A sensor output device includes: a sensor and an output circuit. The sensor includes a piezoelectric element and an output terminal. The piezoelectric element includes porous resin. The output circuit includes a thermistor that connects the output terminal of the sensor to ground.

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.

To provide an electroacoustic transducer in which a vibrating membrane is less likely to be broken and sound pressure is improved even when the transducer is small.SOLUTION: An electroacoustic transducer 2 includes a housing 20, a partition member 30 disposed inside the housing 20, a first electroacoustic conversion unit 100, and a second electroacoustic conversion unit 200. The electroacoustic conversion unit of a first (2) includes a fixed electrode 101(201), a vibrating film 105(205) which is disposed to face the fixed electrode and vibrates according to a potential difference generated between the fixed electrode and the fixed electrode based on an electric signal, and a support member 107(207) which supports a partial region of the vibrating film and brings a part of the vibrating film into contact with the fixed electrode. The first electroacoustic conversion unit and the second electroacoustic conversion unit are disposed to face each other with the partition member 30 interposed therebetween so that a sound emitting part 100a and a sound emitting part 200a communicate with an acoustic outlet 2a, and the partition member 30 supports the support member 107 and the support member 207.SELECTED DRAWING: Figure 3

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.

The present invention relates generally to the field of electret capsule circuit, and more particularly to a circuit configuration of an impedance converter integrated in an electret capsule such as for use in condenser microphones. The electret capsule of a microphone may include a gate biasing field effect transistor (FET) to facilitate biasing of a low noise FET. Advantageously, the use of low noise FET in the electret capsule of a microphone provides for a reduced cost, while achieving lower self-noise.

The invention relates to the technical field of sound equipment, and discloses a condenser microphone, which comprises a power supply conversion module, the power supply conversion module comprises a power supply module and a voltage stabilization module, the output end of the power supply module is connected with the input end of the voltage stabilization module, and the power supply conversion module is used for carrying out primary processing on conversion and adaptation of an input power supply voltage; the output end of the voltage stabilizing module is connected with the input end of the gain strengthening module; the input end of the high-resistance signal presetting module is connected with the output end of the gain strengthening module; the input end of the OTL power module is connected with the output end of the high-resistance signal presetting module, and the output end of the OTL power module is connected with the input end of the power supply module; the input end of the bias module is connected with the output end of the voltage stabilizing module, and the output end of the bias module is connected with the high-resistance signal presetting module and the OTL power module. The method has the advantages that the signal processing stability is improved, the nonlinear distortion is reduced, and the power supply voltage adaptation capability is enhanced.

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 present invention relates to a noise reduction microphone, comprising a cylindrical shell and a sleeve disposed at the front end of the shell, a baffle being integrally disposed transversely in the middle of the inner cavity of the shell, the baffle dividing the inner cavity into a front cavity and a rear cavity, the rear cavity being filled with a rear sound-absorbing sponge, a hollow support rod being inserted in the middle of the rear sound-absorbing sponge, a mounting seat for suspending and mounting a microphone assembly being disposed at the front end of the support rod, a front sound-absorbing sponge being disposed in the front cavity, and the front sound-absorbing sponge being connected to the external environment through the sound inlet of the sleeve. The beneficial effects of the present invention are: simple structure, noise reduction by means of a physical structure, not easy to damage, low cost, and significant noise reduction effect, which greatly simplifies noise reduction measures in places such as customer service centers and saves a large amount of equipment and decoration costs.

To provide an electroacoustic transducer in which a vibrating membrane is less likely to be broken and sound pressure is improved even when the transducer is small.SOLUTION: An electroacoustic transducer 2 includes a housing 20, a partition member 30 disposed inside the housing 20, a first electroacoustic conversion unit 100, and a second electroacoustic conversion unit 200. The electroacoustic conversion unit of the first (2) includes a fixed electrode 101 (201), a vibrating film 105 (205) which is disposed to face the fixed electrode and vibrates according to a potential difference generated between the fixed electrode and the fixed electrode based on an electric signal, and a support member 107(207) which supports a partial region of the vibrating film and brings a part of the vibrating film into contact with the fixed electrode. The first electroacoustic conversion unit and the second electroacoustic conversion unit are disposed to face each other with a partition member 30 interposed therebetween so that a sound emitting part 100a and a sound emitting part 200a communicate with an acoustic outlet 2a, and the partition member 30 supports the support member 107 and the support member 207.SELECTED DRAWING: Figure 3

In one embodiment of an audio system, a transducer can be coupled to a passive acoustic directional amplifier to provide various benefits and improvements, including improvements to: speech intelligibility, signal-to-noise ratio, effective equivalent input noise, at-a-distance acoustic signal reception, and directional preference. In another embodiment, the shape of an interior surface of a passive acoustic directional amplifier is provided. In another embodiment, the material properties of an interior surface of a passive acoustic directional amplifier are provided.

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 %.