74results about "Electrets selectrostatic transducer" patented technology

The utility model discloses polarization equipment for microphone parts, which relates to the technical field of microphone production equipment and comprises a rack, a polarization device is mounted on the rack and comprises a horizontally arranged turntable, a plurality of stations are arranged on the peripheral side of the turntable at equal intervals, each station is provided with a material placing tool, and the material placing tools are arranged on the turntable. A plurality of material placing grooves are formed in the material placing tool; wherein one station is provided with a feeding device connected with the material placing tool, the station located at the downstream of the feeding device is provided with a polarization electrode assembly, and the polarization electrode assembly comprises polarization electrodes corresponding to the material placing grooves. And a discharging assembly is arranged at a station at the downstream of the polarized electrode assembly. According to the utility model, materials polarized by the polarization equipment for microphone components are good in consistency, so that produced microphones are good in consistency and high in qualified rate.

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).

Methods, devices, and processor-readable media for adjusting one or both of a listening experience and a conversation experience, including: processing a user device audio signal representing a sound segment received at a microphone of a user's portable user device, where the sound segment propagates as an acoustic wave between a smart device and the user; an action based on the processing is performed.

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.

A sensing arrangement for detection of electrical discharges in an electrical apparatus is described. The sensing arrangement includes an acoustic sensor and a signal enhancing structure with a funnel region. The acoustic sensor is positioned outside the funnel region on an apex side of the funnel region. An electrical switchgear is described. The electrical switchgear includes a sensing arrangement for detection of electrical discharges in an electrical apparatus. The sensing arrangement includes an acoustic sensor and a signal enhancing structure with a funnel region.

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.

The utility model relates to an anti-interference electret microphone working circuit and an electret microphone. In the anti-interference electret microphone working circuit, a source electrode of a field-effect tube is connected with one end of a second resistor and one end of a third capacitor, a grid electrode of the field-effect tube is connected with one end of the third resistor, and a drain electrode of the field-effect tube is connected with one end of a fourth resistor and one end of a fifth resistor. The other end of the third resistor is connected with the positive end of the electret capacitor, the other end of the second resistor is connected with one end of the first resistor, one end of the first capacitor and one end of the second capacitor, and the other end of the first capacitor and the other end of the first resistor are connected with the positive terminal. And the negative electrode end of the electret capacitor, the other end of the fifth resistor, the other end of the fourth resistor, the other end of the second capacitor and the other end of the third capacitor are respectively grounded through a negative terminal. The anti-interference electret microphone working circuit provided by the utility model has good anti-interference capability through reasonable design.

A speaker protection system includes: a speaker having a driver and a passive radiator or vent; and a controller determining at least one of a displacement of the driver, a displacement of the passive radiator, and a velocity of airflow through the vent based on an input voltage representative of an audible sound, and determine an output voltage at which the speaker reproduces the audible sound based on a single type of compression applied to both the driver displacement and the passive radiator displacement or the vent airflow velocity. An output voltage provided to the speaker limits the driver displacement within a driver displacement range and simultaneously limits the passive radiator displacement within a passive radiator displacement range or the vent airflow velocity within an airflow velocity range to mechanically protect the speaker and reduce distortion of the reproduced audible sound.

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 invention discloses a microphone, electronic equipment and a microphone pickup control method. The microphone comprises the components of a housing which is provided with a sound hole; the sound pickup structure is arranged in the shell, and the sound pickup structure and the sound hole are oppositely arranged; the signal output structure is connected with the pickup structure and is used for outputting a sound signal of the pickup structure; wherein the pickup structure comprises a first pickup structure and a second pickup structure; the first pickup structure and the second pickup structure comprise electrets made of different materials, or the first pickup structure and the second pickup structure comprise coils with different diameters or elasticity moduli.

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.

[Problem] To provide 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. SOLUTION An electrode layer-forming curable organopolysiloxane composition, containing: a curable reactive organopolysiloxane; and (E) conductive fine particles, wherein the sum of the amount of organic solvent in the entire composition is less than 0.1 mass%, as well as a use thereof.

Disclosed is a display device, including a display panel and at least one thin film actuator. The display panel includes a front side and a rear side that are opposite to each other. The thin film actuator is arranged on the rear side, and the thin film actuator indirectly drives the display panel to vibrate through a vibrating cavity or a connecting structure.

The invention relates to the use of a polymer thin film as an electret thin film (3), which polymer thin film is formed from monomers (21) by deposition by means of a chemical vapour deposition process, wherein at least some of the monomers (21) have at least two terminal acrylate and / or methacrylate groups, and wherein the electret thin layer (3) is formed from the polymer thin layer during the vapour deposition process.

The present invention relates generally to the field of electret capsule, 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 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.

To provide an electroacoustic transducer of which the diaphragm is hardly damaged and sensitivity of the electroacoustic transducer is hardly reduced even if downsized.SOLUTION: In an earphone 1, an electroacoustic transducer 2 comprises a housing 20, a partition member 30 disposed in the housing, a first electroacoustic transducing unit 100 and a second electroacoustic transducing unit 200. The electroacoustic transducing units include fixed electrodes 101 and 201, diaphragms 105 and 205 which are disposed oppositely to the fixed electrodes and vibrated in accordance with potential differences generated between the diaphragms and the fixed electrodes based on electric signals, and support members 107 and 207 which support partial regions of the diaphragms partially abut the diaphragms to the fixed electrodes. The first electroacoustic transducing unit and the second electroacoustic transducing unit are disposed while being opposed to each other with the partition member 30 interposed therebetween in such a manner that a sound discharge part 100a and a sound discharge part 200a communicate to an acoustic outlet 2a. The partition member 30 supports the support member 107 and the support member 207 in a recess 33.SELECTED DRAWING: Figure 3

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 present application relates to the technical field of acoustics, and provides a sound production device and a production method therefor, and a display apparatus. The sound production device comprises a first substrate, a first conductive layer, a first protective layer, an organic layer, and a sound production vibration layer, wherein the sound production vibration layer is located on the side of the organic layer away from the first substrate, and at least part of the area between the organic layer and the sound production vibration layer forms a cavity structure; the organic layer comprises a first sub-layer and a supporting pattern located on the first sub-layer, the supporting pattern comprises at least one supporting part, and the first sub-layer covers the first protective layer. The present application is applicable to a display apparatus having a directional sound production function.