Abstract: A sound transducer structure includes a membrane, a counter electrode, and a plurality of elevations. The membrane includes a first main surface, made of a membrane material, in a sound transducing region and an edge region of the membrane. The counter electrode is made of counter electrode material, and includes a second main surface arranged in parallel to the first main surface of the membrane on a side of a free volume opposite the first main surface of the membrane. The plurality of elevations extend in the sound transducing region from the second main surface of the counter electrode into the free volume.

Abstract: An electro-mechanical transducer contains a vibrating electrode (15b), a vibrating-electrode-insulating film (15a) disposed at a bottom surface of the vibrating electrode (15b), an electret layer (13) facing to the vibrating electrode (15b), an electret-insulating layer (14e) joined to a top surface of the electret layer (13), and a back electrode 17 in contact with a bottom surface of the electret layer (13). A microgap between ten nanometers and 100 micrometers is established between the vibrating-electrode-insulating film (15a) and electret-insulating layer (14e). A central line average roughness Ra of the vibrating electrode (15b), including a bending, is 1/10 or less of a gap width measured between the bottom surface of the vibrating electrode (15b) and the top surface of the electret layer (13).

Abstract: A speaker includes a base, a diaphragm, a separating module, a first electrode set and a second electrode set. The base and a porous structure are formed a cavity. The diaphragm is disposed in the cavity and includes a first part and a second part. The separating module is located in the cavity and contacts the diaphragm to separate the cavity into the first and the second chambers. The first electrode set disposed in the first chamber is connected to a first sound source signal, such that the first part of the diaphragm is vibrated and the first sound source signal is exported from the first chamber. The second electrode set disposed in the second chamber is connected to a second sound source signal, such that the second part of the diaphragm is vibrated and the second sound source signal is exported from the second chamber.

Abstract: An electret diaphragm and a speaker using the same are provided. The electret diaphragm includes an electret layer, a bonding layer adhered to a surface of the electret layer, and an aluminum (Al) electrode layer adhered on the bonding layer. The electret layer at least includes ethylene group polymer. A material of the bonding layer is ethylene-ethyl-acrylate (EEA) or ethylene-vinyl acetate (EVA).

Abstract: Disclosed is a crossover double speaker having a small speaker and a large speaker on the upper side and on the lower side thereof. The crossover double speaker includes a cover integrally formed on the outer circumference of a flange of the yoke; a frame disposed below the cover; a first speaker unit including a first magnet disposed in a first speaker space, a first vibration plate arranged over the first magnet, and a first voice coil inserted into a first air gap; and a second speaker unit including a second magnet disposed in a second speaker space, a second vibration plate arranged between the yoke and the frame, and a second voice coil inserted into a second air gap. The yoke has sound release holes to output the sound generated from the second speaker unit in the direction of the first speaker unit.

Abstract: A unidirectional condenser microphone unit includes a unit casing formed of a metallic cylindrical body and having a front acoustic terminal on a front surface thereof and a rear acoustic terminal on a side surface thereof, an electrostatic acousto-electric converter disposed inside the unit casing, and a shield member put on the rear acoustic terminal from an inside of the unit casing in a cylindrical shape. The shield member has a length approximately equal to an inner periphery length of the unit casing and a width covering the rear acoustic terminal. Also, the shield member is formed of a metal plate having spring elasticity, and includes a large number of holes for electromagnetic shield substantially throughout the entire surface thereof.

Abstract: A mobile electronic device including a casing, a signal generator housed within the casing, for generating a signal that has a frequency higher than the human audible range, at least one speaker housed within the casing and coupled with the signal generator, for producing analog output from the signal generated by said signal generator, wherein the analog output produced by the at least one speaker is (i) substantially inaudible, and (ii) causes the casing to vibrate at a frequency approximately equal to a resonant frequency of the casing.

Abstract: Ring-shaped membrane for an electro-acoustical loudspeaker, where said membrane comprises two or more dome-shaped annulus concentrically arranged around a central portion through which an imaginary axis of symmetry passes, where an outer periphery of said membrane is suitable to be attached to a surround; where the central portion is attached to a tower, which again is fastened to the loudspeakers driver, wherein the angle between a plane being perpendicular to the axis of symmetry and the attachment of the membrane to the surround resp. the tower is in the interval 0° to 40°, most preferred around 30°.

Abstract: Disclosed herein is a speaker unit, including: a magnetic circuit having a magnet and a coil; a vibrating plate adapted to be vibrated by a drive force of the magnetic circuit; and a frame having a circuit mounting portion to which the magnetic circuit is mounted, an edge mounting portion to which an edge of the vibrating plate is mounted, and plural leg portions through which the circuit mounting portion and the edge mounting portion are coupled to each other and which are provided in spaced relation to one another in a circumferential direction, wherein irregularity portions are provided in the plural leg portions, respectively, and forms of the irregularity portions are made different from each other at least in two of the leg portions.

Abstract: The present invention is directed to a vibration speaker with a securing device. The vibration speaker includes at least one transducer. The vibration speaker is attached to a securing element, which includes a bottom plate, at least one lateral plate and at least one securing portion. A top surface of the bottom plate is in contact with a bottom surface of the vibration speaker; the lateral plate extends from an edge of the bottom plate, and is in contact with a side surface of the vibration speaker; and the securing portion fastens the vibration speaker.

Abstract: The present invention is directed to a vibration speaker with a securing device. The vibration speaker includes a transducer, and a bottom having at least one groove. At least one fastening element corresponding to the at least one groove is capable of being inserted into the groove. The transducer is driven to generate vibration, which is then transferred to a vibration plate via the fastening element.

Abstract: The present invention is to provide a device with dynamic magnet speaker, which comprises a first housing member having a wall and a first magnetic element fixed on an inner surface of the wall; a seat having a first side connected to the first housing member to define a first receiving space between the first housing member and the first side of the seat; and a hollow tube fixedly provided on the seat and corresponding in position to the first magnetic element, wherein a first coil unit is fixedly mounted around the hollow tube, and the hollow tube extends toward the first magnetic element and is either mounted around an outer periphery of the first magnetic element or inserted in a first central hole of the first magnetic element, so as to not only reduce the weight and spatial volume thereof, but also substantially lower the directivity of sound produced.

Abstract: An electro-acoustic transducer is disclosed. The electro-acoustic transducer includes an electret diaphragm, an orifice plate and a plurality of dividing structures. Each of the dividing structures, disposed between the electret diaphragm and the orifice plate, includes at least one main portion, and the number of the main portion is a positive integer. When the number of the main portion is larger than one, the main portions are respectively connected to a center and extended radially from the center.

Abstract: An ultrasonic transducer having a reduced cost of manufacture. The ultrasonic transducer includes a first insulative retaining layer, a second insulative retaining layer, and a vibrator film layer sandwiched between the first and second retaining layers. The first retaining layer includes a first plurality of apertures formed therethrough, and the second retaining layer includes a second plurality of apertures formed therethrough, in which the second apertures are substantially in registration with the first apertures. The ultrasonic transducer further includes a first cover portion having a plurality of spring/backplate assemblies connected thereto, and a second cover portion. The combination of the first retaining layer, the vibrator film layer, and the second retaining layer is sandwiched between the first and second cover portions of the ultrasonic transducer.

Abstract: Disclosed is a high power micro-speaker having a damper plate. More particularly, disclosed is a high power micro-speaker in which a damper plate has an opening through which a voice coil can pass, and the voice coil having passed through the opening is attached to a lower surface of a vibrating plate that is located above the damper plate, which provides an increased vibrating region. As such, enhanced output power of the micro-speaker is accomplished by increasing a height of the voice coil, or a slimmer design of the micro-speaker is accomplished by reducing a height of a frame.

Abstract: An electrostatic loudspeaker includes: a first electrode; a second electrode which is opposed to the first electrode; and a vibrating member which is disposed between the first electrode and the second electrode and in which an insulation membrane and a conductive membrane are stacked, the insulation membrane being disposed on both end faces of the vibrating member in a direction of the stacking.

Abstract: A flat speaker apparatus including a driving circuit module, a flat speaker and a thermally conductive connector, and with a heat dissipating structure is introduced. The flat speaker includes a porous electrode and a vibrating film. The porous electrode causes the vibrating film to vibrate according to an audio signal output from the driving circuit module for generating sound. The thermally conductive connector connects the driving circuit module and the flat speaker to conduct heat from the driving module to the flat speaker for dissipation. A method for heat dissipation of the flat speaker is also introduced herein.

Abstract: A sound transducer includes a substrate with a cavity with extending from a first surface of the substrate, a body at least partially covering the cavity and being connected to the substrate by at least one resilient hinge, a first set of comb fingers mounted to the substrate, and a second set of comb fingers mounted to the body. The first set of comb fingers and the second set of comb fingers are interdigitated and configured to create an electrostatic force driving the body in a direction perpendicular to the first surface of the substrate. The body and the at least one resilient hinge are configured for a resonant or a near-resonant excitation by the electrostatic force.

Abstract: A structure with an integrated circuit (IC) and a silicon condenser microphone mounted thereon includes a substrate having a first area and a second area. The IC is fabricated on the first area in order to form a conducting layer and an insulation layer. Both the conducting layer and the insulation layer further extend to the second area. The insulation layer is removed under low temperature in order to expose the conducting layer on which the silicon condenser microphone is fabricated. The silicon condenser microphone includes a first film layer, a connecting layer and a second film layer under a condition that the connecting layer connects the first and the second film layers. The first film layer and the second film layer act as two electrodes of a variable capacitance.

Abstract: An electrostatic loudspeaker includes: a vibrating member; an electrode disposed so as to be opposed to the vibrating member; a spacer member disposed on an opposite side of a face of the electrode, which is opposed to the vibrating member, and having acoustic transmission property; and a cover member disposed on an opposite side of a face of the spacer member, which is opposed to the electrode, and having waterproof property and insulation property.

Abstract: An electrostatic loudspeaker includes: a first electrode having acoustic transmission property; a second electrode having acoustic transmission property, and disposed so as to be opposed to the first electrode; a vibrating member having conductibility, and disposed between the first electrode and the second electrode; a first elastic member having elasticity, insulation property, and acoustic transmission property, and disposed between the vibrating member and the first electrode; a second elastic member having elasticity, insulation property, and acoustic transmission property, and disposed between the vibrating member and the second electrode; and a first separation member having insulation property and acoustic transmission property, and disposed on an opposite side of a face of the first electrode, which is opposed to the first elastic member.

Abstract: The present invention is directed to a transducer module, which includes at least two actuators with a same physical dimension. At least two support members correspond to the actuators, and are used to transfer inertial force to a vibration plate. The two support members are disposed between neighboring actuators, and between the actuator and the vibration plate, respectively.

Abstract: A micromini condenser microphone having a flexure hinge-shaped upper diaphragm and a back plate, and a method of manufacturing the same are provided.

Abstract: An electrostatic loudspeaker comprises a membrane structure and an electrode structure. The membrane structure comprises a central membrane portion and a circumferential membrane portion. The electrode structure is configured to electrostatically interact with the membrane structure for causing a movement of the membrane structure along an axis of movement. The electrode structure comprises a circumferential electrode portion and an opening, the circumferential electrode portion being substantially aligned to the circumferential membrane portion and the opening being substantially aligned to the central membrane portion with respect to a direction parallel to the axis of movement. In an end position of the movement of the membrane structure, the central membrane portion is configured to extend at least partially through the opening. A method for operating an electrostatic loudspeaker and a method for manufacturing an electrostatic loudspeaker are also described.

Abstract: An electrostatic loudspeaker comprises a multi-layer panel (1) incorporating an electrically insulating middle layer (2) sandwiched between first and second electrically conducting outer layers (3, 4). A signal generator is provided for applying an alternating electrical voltage across the outer layers (3, 4) to initiate vibration due to variation of the electrostatic forces acting between the layers, thereby serving as a loudspeaker. Furthermore at least one of the outer layers (3, 4) is permeable to air displaced by such vibration. Such a loudspeaker can serve as a low cost audio loudspeaker which can be made lightweight and flexible or large-area so as to render it suitable for a wide range of applications, for example to provide sound reproduction in a home environment without requiring any bulky enclosure, public-address systems, or in a notebook computer or mobile telephone.

Abstract: An electromechanical transducer includes a vibration membrane provided with a first electrode, a substrate provided with a second electrode, and a support member adapted to support the vibration membrane in such a manner that a gap is formed between the vibration membrane and the substrate, with the first and second electrodes being arranged in opposition to each other, wherein a part of the vibration membrane and a part of the substrate are in contact with each other at a contact region, and another region of the vibration membrane other than the contact region is able to vibrate; an overlap region is provided between the first electrode and second electrode in the contact region, and at least one of these electrodes has a through portion formed therethrough in at least a part of the overlap region, and a plurality of protrusions formed within the gap and on at least one of the vibration member and the support member, wherein the contact region is surrounded by the plurality of protrusions.

Abstract: An electronic device is provided. The electronic device includes a housing and an electro-acoustic transducer disposed on the inner surface of the housing. The electro-acoustic transducer includes an electret diaphragm, a conductive plate and at least one spacer. The electret diaphragm is positioned on the inner surface of the housing and has a film body and an electrode layer. The film body has static charges and the electrode layer is formed on the lower surface of the film body. The conductive plate has a plurality of openings and is stacked on the upper surface of the film body. The spacer is positioned between the electret diaphragm and the conductive plate to keep a predetermined distance therebetween.

Abstract: The present invention is directed to a transducer module, which includes an actuator that is directly or indirectly coupled to a vibration plate. The transducer module includes a plastic damper that elastically secures the vibration plate to a frame.

Abstract: A reliable flat speaker unit and a speaker device with the same are provided herein. A conductive electrode of a vibrating membrane of the speaker unit is disposed on both utmost sides of the speaker unit to isolate the speaker unit from environmental moisture, which can significantly improve the reliance of the speaker device. A barrier layer can optionally be disposed on the external side of the conductive electrode to further isolating the speaker unit from moisture, which can improve the reliance and the lifetime of the speaker device. In an embodiment, at least a getter is disposed inside the flat speaker unit to absorb moisture therein. The speaker unit at least includes a electret vibrating membrane with a conductive electrode, a plurality of supporting members, and a electrode structure with a plurality of holes.

Abstract: A flat loudspeaker structure is provided. A conductive electrode of a vibrating membrane of a flat speaker unit is disposed on both utmost sides of the flat speaker unit, so as to improve reliability of the flat speaker unit. The utmost conductive electrodes of the flat speaker unit are further grounded to achieve the EMI preventing function and/or thereby prevent a user from a risk of contacting high voltages. The flat speaker unit at least includes a pair of vibrating membranes each having the conductive electrode, a plurality of supporting members, a perforated electrode structure with a plurality of holes, and an insulator layer.

Abstract: The present invention provides an electret transducer with solar power. The provided electrets transducer includes a solar power supply device, an amplifier circuit having a first input terminal coupled to the solar power supply device and a second input terminal coupled to an audio signal input terminal, and an electret loudspeaker coupled to an output terminal of the amplifier circuit. The amplifier circuit receives a first voltage level via the first input terminal and boosts the first voltage level to a second voltage level, and receives a first audio signal via the second input terminal and amplifies the first audio signal to a second audio signal. The electret loudspeaker coupled to the output terminal of the amplifier circuit receives the second audio signal and outputs a sound corresponding to the second audio signal.

Abstract: An electret loudspeaker device including a diaphragm, a first perforated electrode and a first spacer is provided. The diaphragm has an electret layer and an electrode layer. The first perforated electrode is stacked on a side of the diaphragm near the electret layer, and has multiple holes. The first spacer is stacked between the diaphragm and the first perforated electrode, and includes a first distribution area and plural second distribution areas. The first distribution area has first openings penetrating through the first spacer, and each first opening has a first opening space volume between the diaphragm and the first perforated electrode. Each second distribution area has second openings penetrating through the first spacer, and each second opening has a second opening space volume between the diaphragm and the first perforated electrode. A difference between the first and the second opening space volumes is greater than 10%.

Abstract: An electret loudspeaker device including a diaphragm, a first perforated electrode and a first spacer is provided. The diaphragm includes a first electret, a second electret, a polymer layer and an electrode layer. At least one layer of the first electret or the second electret is formed by expanded polytetrafluoroethylene. The second electret is stacked on one side of the first electret, while the electrode layer is stacked on the opposite side of the first electret. The polymer layer is made of a hydrophobic material and is disposed on the second electret. The first perforated electrode is stacked on a first spacer and close to the polymer layer. The first spacer disposed to between the diaphragm and the first perforated electrode supports the first perforated electrode over the diaphragm and defines a first chamber. A fabrication method of the electret loudspeaker device is also provided.

Abstract: A vibrating electrode plate that senses a sound pressure faces a counter electrode plate to constitute a capacitance type acoustic sensor. In the counter electrode plate, acoustic perforations are opened in order to pass vibration, and plural projections are provided on a surface facing the vibrating electrode plate. An interval between the projections is decreased in a region where the vibrating electrode plate has high flexibility to easily generate local sticking with the counter electrode plate. The interval between the projections is increased in a region where the vibrating electrode plate has low flexibility to hardly generate local sticking with the counter electrode plate. The projections thus arranged prevent firm fixing of the vibrating electrode plate to the counter electrode plate and interruption of vibration of the vibrating electrode plate.

Abstract: A capacitive electro-acoustic transducer includes a pair of input terminals, a pair of output terminals, an electrode plate, and a diaphragm. The pair of input terminals receives an audio signal, and the pair of output terminals outputs the audio signal, wherein at least one terminal of these terminals is a conductive magnet. The electrode plate has a first end and a second end electrically connected to a first input terminal of the pair of input terminals and a first output terminal of the pair of output terminals, respectively. The diaphragm is disposed on one side of the electrode plate and has a third end and a fourth end electrically connected to a second input terminal of the pair of input terminals and a second output terminal of the pair of output terminals, respectively.

Abstract: A method for manufacturing a condenser microphone includes forming a diaphragm module using microelectromechanical system (MEMS) techniques. The diaphragm module includes a diaphragm that is deformable by energy of sound waves, and a diaphragm spacer that extends from one side of the diaphragm and controls a tension of the diaphragm. The method further includes providing a backplate with vent holes, aligning the vent holes of the backplate with a central region of the diaphragm, and connecting the backplate to the diaphragm spacer to construct a transducer unit. The diaphragm spacer, the diaphragm and the backplate cooperate to form an air chamber in fluid communication with an environment external to the condenser microphone. The backplate and the diaphragm cooperate to form a condenser. The method further includes enclosing the transducer unit in a housing that includes a shell and a circuit board to form the condenser microphone.

Abstract: An electronic device includes a capacitance electro-acoustic transducer and an audio driver. The audio driver is coupled to the capacitance electro-acoustic transducer. The audio driver includes a high-voltage amplifier for receiving an input audio signal and for transforming the input audio signal into an output audio signal to drive the capacitance electro-acoustic transducer, wherein an absolute voltage value of the input audio signal is smaller than an absolute voltage value of the output audio signal. The output bandwidth of the capacitance electro-acoustic transducer is controlled by the magnitude of the output current of the audio driver. The capacitance electro-acoustic transducer of the present invention can meet different bandwidth requirements and thus achieve saving power, which cannot be achieved by a traditional dynamic electro-acoustic transducer.

Abstract: A sound production component that includes a vibration element, a support member, and a connection part. The vibration element includes a polygonal vibration plate and an electromechanical conversion element attached to the vibration plate. The connection part connects an entire periphery of the vibration plate to the support member. At least a portion of the connection part has a curved shape. The length of a portion of the connection part which connects each corner of the vibration plate and the support member is shorter than the length of a portion of the connection part which connects a central portion of each side edge of the vibration plate and the support member.

Abstract: An acoustic sensor lengthens the portion of the beam portion not fixed with the anchor without lowering the strength of the beam portion and the supporting strength of the diaphragm. On an upper surface of a silicon substrate, a beam portion made of polysilicon is formed through a second sacrifice layer made of silicon dioxide film on an extended portion of a first sacrifice layer made of polysilicon. The extended portion is formed under a region excluding a distal end of the beam portion. The extended portion is removed by etching from a back chamber arranged in the silicon substrate to form a hollow portion in a region excluding the distal end of the lower surface of the beam portion, and then the second sacrifice layer is removed by etching. The second sacrifice layer remaining on the lower surface of the distal end of the beam portion forms an anchor.

Abstract: A speaker device includes an acoustic-vibration member, an actuator that is driven on the basis of a sound signal and that includes a displacement-output unit that can obtain the displacement corresponding to the sound signal, and a displacement-output-transfer member configured to connect the displacement-output unit to a point predetermined on a face of the acoustic-vibration member. A displacement output of the actuator is transferred to the predetermined point via the displacement-output-transfer member, and the acoustic-vibration member is excited in a face direction from the predetermined point according to the displacement output.

Abstract: An ultrasonic transducer having a reduced cost of manufacture. The ultrasonic transducer includes a first insulative retaining layer, a second insulative retaining layer, and a vibrator film layer sandwiched between the first and second retaining layers. The first retaining layer includes a first plurality of apertures formed therethrough, and the second retaining layer includes a second plurality of apertures formed therethrough, in which the second apertures are substantially in registration with the first apertures. The ultrasonic transducer further includes a first cover portion having a plurality of spring/backplate assemblies connected thereto, and a second cover portion. The combination of the first retaining layer, the vibrator film layer, and the second retaining layer is sandwiched between the first and second cover portions of the ultrasonic transducer.

Abstract: An electro-acoustic transducer according to the present invention is provided. The electro-acoustic transducer includes a conductive plate with a plurality of openings, an electret diaphragm and a fluorescent layer. The electret diaphragm is positioned on the conductive plate and has a film body and an electrode layer. The film body has static charges carried and the electrode layer is formed on the upper surface of the film body. The fluorescent layer is positioned between the lower surface of the film body and the conductive plate.

Abstract: A microelectromechanical system microphone package structure includes a base plate and a plurality of chips is provided. The plurality of chips are disposed on the base plate, wherein an active area of each of the chips is disposed with a microelectromechanical system microphone structure, each of the active areas comprises a normal line, and the normal lines of the chips are unparallel and nonorthogonal to each other.

Abstract: A MEMS microphone has a base, a backplate, and a backplate spring suspending the backplate from the base. The microphone also has a diaphragm forming a variable capacitor with the backplate.

Abstract: 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.

Abstract: In a piezoelectric speaker, an acoustic diaphragm is thicker than a piezoelectric thin film and is formed of a more flexible and higher elasticity material than the piezoelectric thin film, thereby greatly improving output sound pressure in a low frequency band and reducing sound distortion. Further, the piezoelectric thin film is attached to the acoustic diaphragm in an inclined structure in which the piezoelectric thin film is horizontally turned from the acoustic diaphragm, thereby preventing a standing wave from being created by structural symmetry and minimizing sound distortion.

Abstract: A MEMS microphone includes a cover, a housing engaging with the cover for forming a cavity. The housing includes a base and a sidewall extending perpendicularly from the base. A conductive case is provided to cover the cover and the sidewall of the housing. The base defines a periphery portion outside of the cavity for forming a step, and the conductive case locates a bottom end thereof on the step.

Abstract: Disclosed is a silicon condenser microphone including a backplate having a plurality of perforations therethrough, a diaphragm opposed from the backplate for forming a capacitor. The diaphragm includes a first part and a second part received in the first part, the second part being capable of vibrating relative to the backplate. The first part is connected to the ground and the second part is connected to a bias voltage.

Abstract: An electret condenser includes a fixed film 110 including a conductive film 118 to be an upper electrode, a vibrating film 112 including a lower electrode 104 and a silicon oxide film 105 to be an electret film, and a silicon oxide film 108 provided between the fixed film 110 and the vibrating film 112 and including an air gap 109. Respective parts of the fixed film 110 and the vibrating film 112 exposed in the air gap 109 are formed of silicon nitride films 106 and 114.

Abstract: A speaker includes a thermoacoustic module, an amplifier circuit board, and a frame. The thermoacoustic module includes a sound wave generator, at least one first electrode and at least one second electrode. The at least one first electrode and the at least one second electrode are electrically connected to the sound wave generator. The sound wave generator includes a carbon nanotube structure. The amplifier circuit board is electrically connected to the carbon nanotube structure by the at least one first electrode and at least one second electrode. The frame secures the thermoacoustic module and the amplifier circuit board.