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63 results about "Electrostatic transducer" patented technology

Capacitive load driving circuit, electrostatic transducer, method of setting circuit constant, ultrasonic speaker, display device, and directional acoustic system

A capacitive load driving circuit includes an error amplification circuit that amplifies a difference between an external input signal provided to one input terminal and a negative feedback signal provided from the following negative feed back circuit to the other input terminal; a modulation circuit that pulse-modulates the signal outputted from the error amplification circuit; a power switching circuit that switches between a power supply voltage and a ground potential or between a positive power supply voltage and a negative power supply voltage; a gate driving circuit that generates a gate driving signal for switching-controlling a switching element configuring the power switching circuit, from a modulated signal outputted from the modulation circuit; a low-pass filter that is connected to an output side of the power switching circuit and removes switching carrier components included in an output signal of the power switching circuit; an output transformer that boosts an output signal of the low-pass filter and has a primary winding connected to an output terminal of the low-pass filter; a capacitive load that is connected in parallel with a secondary winding of the output transformer; and a negative feedback circuit that performs a negative feedback from the output terminal of the low-pass filter to an input side of the error amplification circuit.
Owner:SEIKO EPSON CORP

Electrostatic loudspeaker capable of dispersing sound both horizontally and vertically

ActiveUS20070242844A1Improved dispersion of soundIncreased angular dispersion of soundElectrostatic transducer loudspeakersFrequency/directions obtaining arrangementsEffect lightEngineering
An acoustic transducer, specifically an electrostatic loudspeaker (ESL) providing curvature in two directions for improved dispersion of sound waves. The compound curvature also provides a virtual focus of the propagated sound waves for accurate reproduction of musical program material recorded with standard single-point microphones. The highly directional nature of high frequency sound waves requires that a flat or cylindrical electrostatic transducer must be physically tall to allow a listener to either recline or stand. The two-axis curved structure enables a compact form of ESL to be realized, including bookshelf type loudspeakers whereas all known commercial units are comparable in height to that of a human listener. The individual curved ESL panels can also be readily combined to create larger transducer assemblies including omni-directional units. A preferred stator panel hole-geometry is included for improved high voltage operation of coated perforated metal stator panels, and methods of forming the metal panel are described. The artistic nature of the two-dimensionally curved electrostatic transducer also lends itself to other non-traditional forms such as integration into lighting fixtures and other such architectural uses.
Owner:LUMINOS INDS

Internal electrostatic transduction structures for bulk-mode micromechanical resonators

InactiveUS20060017523A1High dielectric constantMotional impedance is decreasedImpedence networksCMOSClassical mechanics
An electrostatic transducer for micromechanical resonators, in which the electrode gaps are filled with a dielectric material having a much higher permittivity than air. This internal electrostatic transducer has several advantages over both air-gap electrostatic and piezoelectric transduction; including lower motional impedance, compatibility with advanced scaled CMOS device technology, and extended dynamic range. In one aspect, in order to minimize energy losses, the dielectric material has an acoustic velocity which is matched to that of the resonator material. Internal electrostatic transduction can be adapted to excite and detect either vertical modes (perpendicular to the substrate) or lateral modes (in the plane of the substrate). Its increased transduction efficiency is of particular importance for reducing the motional resistance of the latter.
Owner:RGT UNIV OF CALIFORNIA

Electrostatic transducer, ultrasonic speaker, driving circuit of capacitive load, method of setting circuit constant, display device, and directional sound system

An electrostatic transducer includes: a class-D power amplifier that amplifies an input signal; and a low pass filter that has a plurality of pairs of inductors and capacitors, is connected to an output side of the class-D power amplifier, and serves to eliminate switching carrier components included in an output of the class-D power amplifier. An electrostatic load capacitor of the electrostatic transducer serving as a driving load is disposed at a capacitor, which is closest to the output side of the class-D power amplifier, of circuit elements forming the low pass filter, an electrostatic coupling capacitor and an output transformer are interposed between the electrostatic load capacitor of the electrostatic transducer and an inductor closest to the output side of the class-D power amplifier of the low pass filter, and a damping resistor is connected in series to a primary coil of the output transformer.
Owner:SEIKO EPSON CORP

Electrostatic transducer, ultrasonic speaker, driving circuit of capacitive load

InactiveCN1972530AFlat Output Frequency CharacteristicsPower amplifiersProjectorsCapacitanceOutput transformer
Provided are an electrostatic transducer capable of reducing a loss in a damping resistor and realizing a flat frequency characteristic in a driving frequency band in the case of using a class-D power amplifier and an LC filter, a method of setting a circuit constant of the electrostatic transducer, an ultrasonic speaker, a display device, and a directional sound system and a driving circuit of a capacitive load . An electrostatic transducer includes: a class-D power amplifier that amplifies an input signal; and a low pass filter that has a plurality of pairs of inductors and capacitors, is connected to an output side of the class-D power amplifier, and serves to eliminate switching carrier components included in an output of the class-D power amplifier. An electrostatic load capacitor of the electrostatic transducer serving as a driving load is disposed at a capacitor, which is closest to the output side of the class-D power amplifier, of circuit elements forming the low pass filter, an electrostatic coupling capacitor and an output transformer are interposed between the electrostatic load capacitor of the electrostatic transducer and an inductor closest to the output side of the class-D power amplifier of the low pass filter, and a damping resistor is connected in series to a primary coil of the output transformer.
Owner:SEIKO EPSON CORP

Transducer assembly

A transducer assembly includes a first electroacoustic transducer and a second electroacoustic transducer. The first and the second electrostatic transducers include an electrode and a counter electrode. An inner circumference of an outer diaphragm section lying within an outer circumference forms the counter electrode of the first electroacoustic transducer. An inner diaphragm section that lies within the inner circumference of the outer diaphragm section forms the counter electrode of the second electroacoustic transducer.
Owner:AKG ACOUSTICS

Wireless power transfer via electrodynamic coupling

Wireless power transmission (WPT) systems are provided. According to an embodiment, the WPT system uses one or more power transmitting coils and a receiver for electromagnetically coupled wireless power transfer. The electrodynamic receiver can be in the form of an electrodynamic transducer where a magnet is allowed to oscillate near a receiving coil to induce a voltage in the receiving coil, a piezoelectric transducer where the magnet causes a vibrating structure with a piezoelectric layer to move, an electrostatic transducer where movement of the magnet causes a capacitor plate to move, or a combination thereof. An alternating magnetic field from the transmitting coil(s) excites the magnet in the receiver into mechanical resonance. The vibrating magnet then functions similar to an energy harvester to induce voltage / current on an internal coil, piezoelectric material, or variable capacitor. Embodiments utilize magnetic coupling and electromechanical resonance for safe, spatially distributed, low-frequency power delivery to portable devices.
Owner:UNIV OF FLORIDA RES FOUNDATION INC

Thermoelectric generator with micro-electrostatic energy converter

A power supply comprises a thermoelectric generator, an initial energy management assembly, an electrostatic converter and a final energy management assembly. The thermoelectric generator is adapted to generate an electrical activation energy with sufficiently high voltage in response to a temperature gradient acting across the thermoelectric generator. The initial energy management assembly is connected to the thermoelectric generator and is adapted to receive and condition the electrical activation energy produced by the thermoelectric generator. The electrostatic converter is connected to the initial energy management assembly and is activatable by the electrical activation energy received therefrom and is configured to generate electrical energy in response to vibrational energy acting thereupon. The final energy management assembly is connected to the electrostatic converter and is adapted to condition the electrical energy produced thereby.
Owner:DIGITAL ANGEL CORP

Rotational MEMS resonator for oscillator applications

An apparatus includes a microelectromechanical system (MEMS) device. The MEMS device includes a resonator suspended from a substrate, an anchor disposed at a center of the resonator, a plurality of suspended beams radiating between the anchor and the resonator, a plurality of first electrodes disposed about the anchor, and a plurality of second electrodes disposed about the anchor. The plurality of first electrodes and the resonator form a first electrostatic transducer. The plurality of second electrodes and the resonator form a second electrostatic transducer. The first electrostatic transducer and the second electrostatic transducer are configured to sustain rotational vibrations of the resonator at a predetermined frequency about an axis through the center of the resonator and orthogonal to a plane of the substrate in response to a signal on the first electrode.
Owner:SILICON LAB INC

Suspended passive element for MEMS devices

InactiveUS20140361844A1Reduces and eliminates transferMultiple-port networksElectrical transducersCouplingEngineering
A technique decouples a MEMS device from sources of strain by forming a MEMS structure with suspended electrodes that are mechanically anchored in a manner that reduces or eliminates transfer of strain from the substrate into the structure, or transfers strain to electrodes and body so that a transducer is strain-tolerant. The technique includes using an electrically insulating material embedded in a conductive structural material for mechanical coupling and electrical isolation. An apparatus includes a MEMS device including a first electrode and a second electrode, and a body suspended from a substrate of the MEMS device. The body and the first electrode form a first electrostatic transducer. The body and the second electrode form a second electrostatic transducer. The apparatus includes a suspended passive element mechanically coupled to the body and electrically isolated from the body.
Owner:SILICON LAB INC

Electrostatic induction based metal surface contact damage on-line monitoring system and monitoring method

The invention discloses an electrostatic induction based metal surface contact damage on-line monitoring system and a monitoring method. The system provided by the invention contains an electrostatic transducer, a signal acquisition and processing analysis system and an auxiliary part, wherein the electrostatic transducer is composed of an electrostatic induction head, a shielding cover, an insulation part and a charge amplifying circuit; the signal acquisition and processing analysis system is composed of a computer, a signal processing program and a signal conditioning acquisition hardware; and the auxiliary part contains a sensor mounting rack. The system can be utilized to monitor metal surface contact damage on line, determine whether there is contact damage on the metal surface and determine the degree of the damage. The monitoring system and the method belong to the field of direct monitoring of damaged surface and can replace commonly-used monitoring systems and methods by secondary influence parameters such as vibration signal monitoring, temperature monitoring and the like.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Electrostatic transducer reliability analysis method and system

The invention relates to an electrostatic transducer reliability analysis method and a system. The analysis method comprises steps of imposing bias voltage on an input electrode and a bias electrode of an electrostatic transducer; imposing impulse load on the electrostatic transducer according to the preset impact magnitude and carrying out mechanical impact; monitoring the resistance value between an input electrode and an output electrode of the electrostatic transducer during the mechanical impact; and adjusting the amplitude of the bias voltage and when the resistance value jumps from infinity to the limit value, obtaining and outputting the minimal bias voltage of false triggering the electrostatic transducer via measurement in the current impact magnitude. Thus, it is achieved that in a certain mechanical impact condition, the minimal bias voltage of false triggering caused by down drawing of a movable flat plate can be obtained; the shock resistance design of the electrostatic transducer and prediction and prevention for false contact actions caused by the mechanical impact and static electric power coupling can be obtained; and stability and reliability of the electrostatic transducer are improved.
Owner:FIFTH ELECTRONICS RES INST OF MINIST OF IND & INFORMATION TECH

Communication device and system for performing data communication using a human or animal body as transmission medium

The invention is directed at a communication device for performing data communication using a human or animal body as transmission medium. The communication device comprises a transceiver unit comprising at least one of a transmitter and a receiver. The communication device also comprises an electrostatic transducer for enabling data communication via a surface of the body with one or more user devices in touch with or located near (i.e. in close proximity, e.g. within a range of 0-10 mm therefrom) the body. The communication device further comprises an ultrasonic transducer for enabling data communication through the body using ultrasonic waves. Both the electrostatic transducer and the ultrasonic transducer are capacitive type transducers connected to and operated via the transceiver unit.
Owner:KONINKLJIJKE PHILIPS NV

Electrostatic loudspeaker capable of dispersing sound both horizontally and vertically

An acoustic transducer, specifically an electrostatic loudspeaker (ESL) providing curvature in two directions for improved dispersion of sound waves. The compound curvature also provides a virtual focus of the propagated sound waves for accurate reproduction of musical program material recorded with standard single-point microphones. The highly directional nature of high frequency sound waves requires that a flat or cylindrical electrostatic transducer must be physically tall to allow a listener to either recline or stand. The two-axis curved structure enables a compact form of ESL to be realized, including bookshelf type loudspeakers whereas all known commercial units are comparable in height to that of a human listener. The individual curved ESL panels can also be readily combined to create larger transducer assemblies including omni-directional units. A preferred stator panel hole-geometry is included for improved high voltage operation of coated perforated metal stator panels, and methods of forming the metal panel are described. The artistic nature of the two-dimensionally curved electrostatic transducer also lends itself to other non-traditional forms such as integration into lighting fixtures and other such architectural uses.
Owner:LUMINOS INDS

Improved electrostatic transducer

An electrostatic transducer (100) comprises an electrically conductive backplane member (102) having an array of through apertures (112); a spacer member (104) disposed over the backplane member (102), the spacer member (104) having an array of holes (114) therethrough, the holes (114) each having a maximum lateral dimension less than twice a minimum lateral dimension; and a flexible electrically conductive membrane (106) disposed over the spacer member (104). The transducer (100) is arranged in use to apply an electrical potential which gives rise to an attractive electrostatic force between the backplane member (102) and the membrane (106) thereby moving portions of the membrane (106) spanning said holes in the spacer member (104) towards said backplane member (102).
Owner:WARWICK AUDIO TECH LTD

Electrostatic transducer

An electrostatic transducer comprises an electrically conductive first layer (1), a flexible insulating second layer (25) disposed over the first layer, and a flexible electrically conductive third layer (26) disposed over the second layer. Between the first and the second layers are provided spacers (24) and between the second and the third layers are provided spacers (27). The spacers may be provided by strips of adhesive or by bonding the layers together by welding, for example. The first layer (1) is provided with an array of through apertures (5) each having an inlet (6) facing the second layer (2) and an outlet (7). In response to signals applied to the first and third layers, the second and third layers have portions which are displaced towards the outlets of the apertures by electrostatic forces. The apertures (5) may have conducting walls and the walls may converge.
Owner:WARWICK AUDIO TECH LTD

Electrostatic transducer, method for connecting the same and manufacturing method

An electrostatic transducer, a method for connecting the same and a manufacturing method. The electrostatic transducer comprises at least one stator, which comprises an insulating layer and a conducting layer, and a film element which is arranged to vibrate in response to voltage supplied to it and which is provided in such a manner that an air gap is formed between the conducting layer and the film element. The electrostatic transducer also comprises at least one fastening edge arranged on the outer edge of the electrostatic transducer, the fastening edge being arranged to be fastened to a fastening element of a second electrostatic transducer.
Owner:PANPHONICS OY

Method, device and system for measuring thickness of parallel movable electrode

The invention relates to a method, device and system for measuring the thickness of a parallel movable electrode. The method comprises the following steps of: acquiring the inter-electrode distance ofan electrostatic transducer respectively corresponding to each bias voltage, wherein the inter-electrode distance is the distance from a first end face of the movable electrode of the electrostatic transducer to a first end face of the fixed electrode; the first end face of the movable electrode is arranged far away from the fixed electrode; the first end face of the fixed electrode is arranged close to the movable electrode; the thickness of the movable electrode is obtained according to each bias voltage and each inter-electrode distance, therefore, the relationship among the bias voltage,the inter-electrode distance and the thickness of the movable electrode is established by a method for measuring the thickness of the parallel movable electrode, the error caused by direct instrumentmeasurement is avoided, and the precision of measuring the thickness of the movable electrode of the electrostatic transducer with a parallel structure is improved, so that good support is provided for analyzing the performance of the electrostatic transducer.
Owner:CHINA ELECTRONICS PROD RELIABILITY & ENVIRONMENTAL TESTING RES INST THE FIFTH ELECTRONICS RES INST OF MIITCEPREI LAB

Electrostatic mutual inductor

An electrostatic transducer of small size, particularly having a diameter of 2-30 mm, is provided with a metal housing or electrically conductive housing having at least one front sound entry opening and a print arranged on a rear side of the housing, wherein the print substantially closes off the housing and has at least one rear sound entry opening, and wherein an electronic system is arranged on the inner side of the print. The at least one rear sound entry opening is formed at the periphery of the print.
Owner:AKG ACOUSTICS

Electrostatic transducer

Provided is an electrostatic transducer which is small in size and has a large electrostatic capacitance, while having a durable constituent part of a conduction path, said constituent part being connected to an electrode. This electrostatic transducer is provided with a plurality of first electrode sheets, a plurality of second electrode sheets and a plurality of dielectric sheets. Each one of the plurality of first electrode sheets is provided with a first counter electrode part and a first terminal electrode part. Each one of the plurality of second electrode sheets is provided with a second counter electrode part and a second terminal electrode part. Each one of the plurality of dielectric sheets is provided with a dielectric main body, a first extending part that is interposed between a plurality of first terminal electrode parts, and a second extending part that is interposed between a plurality of second terminal electrode parts.
Owner:SUMITOMO RIKO CO LTD
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