Abstract: The present invention provides: a loudspeaker including a frame, a drive unit, and a membrane; the membrane having an inner edge, an outer edge which is suspended from the frame, and a membrane body which is between the inner and outer edges and extends around the drive unit; the drive unit having a stationary part secured to the frame and a translatable part secured to the inner edge of the membrane; the membrane body including a dished portion which, has a depth that increases from said inner and outer edges towards a base region of the dished portion located between said edges; wherein the loudspeaker includes a stiffening element which extends around the drive unit and stiffens the membrane body at the base region of the dished portion, so as to reinforce the membrane against deformation in the base region. By including the stiffening element, it has been found that the first break-up resonance of the membrane is shifted to a higher frequency and has reduced amplitude.

Abstract: An electro-acoustical transducer of the present invention includes: a diaphragm of an elongated shape; a first magnet of a parallelepiped shape which is situated at a side of one principal surface of the diaphragm such that long sides thereof are in parallel with long sides of the diaphragm, and which is polarized in a short side direction to form a magnetic gap; a second magnet of a parallelepiped shape which is situated next to the first magnet in the short side direction of the diaphragm, such that long sides thereof are in parallel with the long sides of the diaphragm, and which is polarized toward a direction in a manner opposite to the first magnet so as to form a magnetic gap; and a coil of an elongated ring shape which is situated on the diaphragm such that long sides thereof are situated in the magnetic gaps.

Abstract: A speaker with acoustic chamber is provided. The speaker includes a main body and an acoustic chamber fixed to the main body. The acoustic chamber can be converted between a collapsed state and an expanded state. The acoustic chamber is drawn to the expanded state to increase the volume of the acoustic chamber and is collapsed to the collapsed state to decrease the volume of the acoustic chamber. When the acoustic chamber is drawn to the expanded state, the quality of the sound output by the speaker is improved.

Abstract: A transducer generates acoustic energy. The transducer is suitable for incorporation into any device that needs sound reproduction capability, including devices with generally rectangular geometries such as cell phones, PDAs, and portable gaming devices. The transducer includes a displaceable membrane with a deformable corner. The deformable corner may extend the frequency range over which the transducer generates acoustic energy without distortion. The deformable corner may be part of a membrane periphery around the displaceable membrane. The membrane periphery may be square, triangular, or may take any other polygonal shape.

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: A loudspeaker radiating diaphragm can be stiffened to help increase the breakup frequency to above the working frequency range of the driver concerned, by forming it of a moulded part and an attached formed part. The moulded part is a radiating surface with stiffening ribs. The formed part is a thin surface of high modulus material, attached to the rear of the ribs. The overall structure can have significantly higher stiffness than either of the two parts. This helps in designing a loudspeaker driver that does not breakup within its working frequency range.

Abstract: A micro speaker includes a substrate having a cavity formed therein, a diaphragm formed on the substrate overlapping the cavity. The diaphragm includes a first vibration membrane formed in a first area corresponding to a center portion of the cavity and a second vibration membrane formed in a second area corresponding to an edge portion of the cavity and formed of material different from that used for the first vibration membrane. A piezoelectric actuator is formed including a first electrode layer formed on the first vibration membrane, a piezoelectric layer formed on the first electrode layer, and a second electrode layer formed on the piezoelectric layer, and first and second curved lead wires, respectively connected to the first and second electrode layers across the second area, which are symmetrical to the center of the piezoelectric actuator.

Abstract: An electromagnetic vibrator includes an upper basin frame, an induction coil, and a lower basin frame, wherein the upper basin frame includes a supporting frame, a vibration sheet, and a suspension edge element. The vibration sheet and the suspension edge are integrally formed together via mold injecting, so as to achieve variety of style and colors of the speaker. The manufacturing method of the electromagnetic vibrator improves the traditional producing process of a speaker by minimizing the gluing procedure thereof. The machinery equipments replace the traditional manual process. The special coupling structure and unique process of the electromagnetic vibrator also reduce the amount of using glue, so that the manufacturing cost is minimized, the un-stability of manually operation process is minimized, the quality and production rate is enhanced, and the process is relatively more environmental friendly.

Abstract: A loudspeaker is disclosed, comprising a driven body and a suspension for providing a restoring force to the driven body, the suspension having a cup geometry wherein its attachment point on the fixed portion of the loudspeaker is displaced along the axis of motion relative to its attachment point on the driven body and comprising a first concentric region that is extendible to allow reciprocating axial movement of the driven body, a second concentric region which extends transversely from the first region toward one of the attachment points, and a circumferential member affixed to the suspension at a location between the first and second concentric regions, the circumferential member being relatively stiff compared to the material forming the first and second concentric regions.

Abstract: A speaker (200) includes a cylindrical diaphragm (201) which has closed ends, an edge (202) which supports the diaphragm (201) in a manner which allows the diaphragm to vibrate, a voice coil bobbin (203) around which a voice coil (204) is wound and which is connected to the diaphragm (201), and a magnetic circuit for driving the voice coil (204).

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: An electroacoustic transducer includes a diaphragm having a center dome and a sub dome connectingly provided around the center dome, and a unit frame for oscillatably supporting the diaphragm. The sub dome is formed with a flat flange part at the peripheral edge thereof, and the unit frame is formed with a flat support face facing the flange part. The flange part is attached to the support face via an adhesive. The bonding area of the support face and the flange part increases gradually from an inside end of the support face to an outside end thereof. The support face may include a plurality of first bosses arranged at predetermined intervals along the inside end thereof, and a plurality of second bosses each having a diameter larger than that of the first boss arranged at predetermined intervals on the outside of the first boss group.

Abstract: A method of protecting a resonating sensor is described. The protected resonating sensor may include at least one passive ultrasonically excitable resonating sensor unit. Each sensor unit has one or more vibratable members having a resonating frequency that varies as a function of a physical variable in a measurement environment. The sensor is protected by forming one or more protective chambers defined between a compliant member and the vibratable member(s). A substantially non-compressible medium is disposed within the protective chamber(s). The compliant member has a first side that may be exposed to a measurement environment and a second side that may be exposed to the substantially non-compressible medium. The substantially non-compressible medium may be a liquid or gel and is in contact with the vibratable member(s). When the medium is a liquid, the chamber is sealed. When the medium is a gel, the chamber may be sealed or non-sealed.

Abstract: A support member for a voice coil former in an audio transducer is described. The support member comprises a bridge between the inner surface of the voice coil former and a radiating surface, such as a diaphragm or cone, which is disposed in the center of the voice coil former. The support member provides added rigidity to reduce wobble during operation of the transducer.

Abstract: A spring plate includes an engaging portion, a connecting portion, a first elastic portion, a second elastic portion, a first fixing portion, and a second fixing portion. The first elastic portion and the second elastic portion are connected to the engaging portion and the connecting portion, the first fixing portion and the second fixing portion are formed on opposite ends of the connecting portion. The engaging portion defines a recess. The present disclosure further provides a voice coil motor using the spring plate.

Abstract: A damper, which is an element of a speaker and suppresses the rolling of a voice coil unit, includes a corrugated structure portion at its inner periphery and a leaf spring at its outer periphery. By coupling the corrugated structure portion to the voice coil unit and coupling the leaf spring to the frame, the distortion of a speaker can be reduced and the driving efficiency can be improved.

Abstract: In a speaker, a first space enclosed by the surface of a second edge close to a magnetic circuit body, a suspension holder, the outer circumferential surface of a voice coil body, the magnetic circuit body, and a frame is airtight to the atmosphere outside the speaker, to make a first space function as an air suspension. The voice coil body is supported with a first edge and a second edge, and with the aid of the springiness of gas inside a first space. Hence, an equivalent, low Young's modulus can be set to the first edge and the second. Consequently, deformation of the diaphragm connected to the first edge is reduced during sound reproduction, thereby reducing disturbance in frequency response in the middle and high ranges.

Abstract: A multi-functional subminiature speaker, namely a bone conduction speaker, which can generate vibration for a bone conduction function, bodily sensation of vibration, speaker attachment, and the vibration modes over the housing unit, without any projections, and which has an acoustic portion unit detachably mounted. The bone conduction is performed without the projections because the vibration can be generated over the whole surface of the multi-functional subminiature speaker, such that loss of the magnetic force transmitted to the vibration coil is minimized by disposing the magnets on both inner and outer sides with respect to the vibration coil.

Abstract: There is provided a dynamic sound transducer having a diaphragm with a ridge. First and second grooves (20, 30) are arranged on a first side of the ridge in such a way that the first and second grooves cross each other.

Abstract: A loudspeaker driver has a diaphragm connected to a surrounding frame by a roll suspension which extends around the diaphragm and within the frame. The roll suspension connects the outer edge of the diaphragm to the inner edge of the frame and flexes as the diaphragm is displaced to and fro axially relative to the frame. In order to provide for better integrity of the roll suspension during its displacement, and reduce unwanted deformation and concomitant distortion, the suspension roll is provided with pleats extending across the roll suspension transversely to the direction of axial movement of the diaphragm to create a series of undulations (peaks and troughs) around the perimeter of the roll suspension. In transverse cross-section, the roll suspension is parabolic. The roll suspension varies continuously between each peak and adjacent trough.

Abstract: A speaker includes a frame, a magnetic circuit secured to the frame, a voice coil, a damper, and a diaphragm. The voice coil is inserted in a magnetic gap of the magnetic circuit. The damper is secured to the voice coil and the frame and formed with a plurality of corrugations. The diaphragm is secured to the frame and the voice coil. One of the plurality of corrugations located on an inner circumferential side of the damper is provided with a plurality of apertures, and these apertures are covered by an elastic member.

Abstract: A loudspeaker comprising a housing provided with a magnet unit that generates a magnetic field, and a membrane which is mounted in a frame and which is provided with an electrical conductor arranged in a pattern on the membrane, which membrane is positioned in the magnetic field in such a manner that a force is exerted when current is fed through the conductor pattern on the membrane, which force is capable of setting at least part of the membrane in motion so as to produce sound, wherein a part of the conductor pattern extends beyond the plane of the aforesaid movable part of the membrane near at least one end of the membrane. Preferably, the aforesaid part of the conductor pattern makes an angle of about 90 degrees with the aforesaid movable part of the membrane.

Abstract: The present invention relates to a loudspeaker in the acoustic field and the information communication field. The invention provides a loudspeaker that can realize a thinner size. To achieve this, the loudspeaker of the present invention is structured so that a part of a diaphragm is inserted to a dent or an opening formed at the center poles of a lower plate of a magnetic circuit. This structure allows the diaphragm to be stored within the height of the magnetic circuit, thus allowing the loudspeaker to have a thinner size.

Abstract: A speaker includes an elongated diaphragm and a coupling member including forward and rearward segments, wherein at least two protrusions are provided at the rear side of the diaphragm along the major axis direction, the forward segment is engagingly disposed between the opposing end faces of two adjacent protrusions and also between the two portions of a rib of the diaphragm opposing each other in the minor axis direction, and wherein the outer circumferential surface of the voice coil bobbin is connected to the inner circumferential surface of the rearward segment, whereby the voice coil bobbin having a diameter larger than the dimension of the diaphragm measured along the minor axis direction can be successfully attached to the diaphragm. In the speaker described above, the diameter of the voice coil bobbin can be increased without decreasing the width of a surround thus enabling the withstanding of higher power input.

Abstract: A speaker includes a magnetic circuit defining a magnetic gap, a diaphragm defining a central part and peripheral part surrounded the central part of the diaphragm, a coil defining an end suspended in the magnetic gap, an elastic plate defining a central flat coupled to the central part of the diaphragm and a side coupled to another end of the coil. And the side of the elastic plate comprises a first part extending perpendicularly from the central flat toward the peripheral part of the diaphragm and a second part extending parallel to the central flat for coupling another end of the coil.

Abstract: A sound producing system includes an electro-acoustic transducer having an electromagnetic motor for moving a diaphragm of the transducer back and forth to create acoustic waves. The diaphragm has a surface that includes one or more of a surface of a dust cap of the diaphragm, a surface of a cone of the diaphragm, and a portion of a surface of a surround of the diaphragm. A solid gas impermeable cover faces the diaphragm surface and has a surface which faces the diaphragm surface. At least a portion of the cover surface has a contour which is substantially the same as a contour of the diaphragm surface. The system includes an asymmetric exit for the acoustic waves to leave a volume defined between the diaphragm surface and the cover surface.

Abstract: A speaker (100, 200) including: a magnetic circuit (120, 220); a frame (103, 203); a coil (109, 210); a diaphragm (101, 201) including a connection portion (102, 202) which connects the diaphragm (101, 201) and the frame (103, 203) to allow the diaphragm (101, 201) to vibrate in a direction vertical to the frame; and a cover member (101, 205) which (i) is disposed to be connected to one end of the frame (103, 203) and to cover the diaphragm (101, 201) from above, and (ii) forms, between the cover member (101, 205) and another end of the frame (103, 203), an opening (130, 230) for emitting a sound, the one and the other ends being in a lateral direction that is orthogonal to the vertical direction, wherein the cover member (101, 205) includes, on a closed end side, a spacer (110, 201) for reducing volumetric capacity of a space on the closed end side above the diaphragm (101, 201) and below the cover member (101, 205).

Abstract: A speaker diaphragm includes a thermoplastic resin having a three-layer structure. The three-layer structure includes a polyester film as a base material of the three-layer structure, a polyimide-based resin layer as a top layer of the three-layer structure, and another polyimide-based resin layer as a bottom layer of the three-layer structure.

Abstract: A diaphragm and a loudspeaker using the diaphragm are disclosed. The diaphragm has a diaphragm body with at least one projection formed thereon, to reduce peaks in the medium-high frequency section of the frequency response curve for the loudspeaker, and make the frequency response curve smooth in medium-high frequency.

Abstract: A loudspeaker including a moving magnet motor. The moving magnet motor includes an armature comprising a magnet carrier, and a lever arm, coupling the armature and a pivot. The lever arm further couples the armature and an acoustic diaphragm to transmit motion of the armature to the acoustic diaphragm to cause the acoustic diaphragm to move. The loudspeaker described may be torque balance and moment balanced.

Abstract: A loudspeaker including a moving magnet motor. The moving magnet motor includes an armature comprising a magnet carrier, and a lever arm, coupling the armature and a pivot. The lever arm further couples the armature and an acoustic diaphragm to transmit motion of the armature to the acoustic diaphragm to cause the acoustic diaphragm to move. The loudspeaker described may be torque balance and moment balanced.

Abstract: A composite speaker is provided capable of obtaining larger sound output than that of a conventional flat panel speaker and flat speaker when input with an audio signal of the same strength.

Abstract: The present invention further reduces a weight with an internal loss being large without reducing high rigidity and an environment resistance, thereby enabling a maximum sound pressure to be increased. A speaker diaphragm (2), and plural dimples (16) which are disposed radially from a center side toward the outside of the speaker diaphragm (2) and which have arch structures formed to have a concave-like shapes so as to disperse a stress are provided, whereby while the weight saving is realized in terms of the speaker diaphragm (2) by the plural dimples (16) formed to have the concave-like shapes, the high rigidity is maintained by the arch structures of the dimples concerned, and a maximum sound pressure can be increased along with the weight saving concerned.

Abstract: A loudspeaker comprising a frame, a voice coil assembly disposed within the frame, a magnet assembly disposed within the frame and a first suspension element having an outer edge and an inner edge, wherein the outer edge is coupled to the voice coil assembly and the inner edge is coupled to the magnet assembly.

Abstract: The invention provides a speaker in which a damper is effectively added without impairing the thinness of the speaker, and which, although the speaker is thin and small, exhibits high withstand input and high output power performances. A damper (14) is disposed between the lower end of a voice coil bobbin (12) and a magnet (3) of a magnetic circuit (5), and supports a vibration system (13) in a manner that the system is vibratable with respect to the magnet (3).

Abstract: An electrostatic speaker system including at least one electrostatic speaker element having a pair of stators and a diaphragm therebetween, each of the stators and the diaphragm having an least one electrically conductive portion. The conductive portion of the diaphragm is patterned as a mesh, which may include gaps, and a conforming layer overlying the conducting portion of the diaphragm and disposed so as to cover gaps in the mesh. A speaker drive circuit provides soft clipping of the audio input signal so that the audio signal applied between the diaphragm and the stators does not exceed the maximum acceptable level that can be applied between the diaphragm and the stators of at least one speaker element.

Abstract: Each of a speaker diaphragm, a dust cap, and a frame includes a resin and a plant opal that is extracted from a bamboo leaf, and is formed by injection molding or sheet molding. The configuration can enhance stiffness of each of the diaphragm, the dust cap, and the frame and implement high performance.

Abstract: An electrodynamic transducer with a membrane includes an electrodynamic motor in a carcass in which a coil held by a mandrel connected to the membrane is capable of movement. The mandrel has a shape generated by an essentially linear generatrix, the coil being arranged in an air gap of a vertical free space where it is capable of movement and defined, towards the center of the transducer, by an inner magnetic structure and, towards the periphery of the transducer, by an outer magnetic structure, at least one of the magnetic structures generating a static magnetic field, wherein the transducer does not include any peripheral nor inner suspension and the guiding of the mobile equipment and the pneumatic tightness between the front and rear faces of the membrane being ensured by a ferrofluid. The mandrel is maintained in the air gap by the ferrofluid applied on at least one of the two faces of the mandrel and entirely filling the air gap.

Abstract: A phasing plug includes a base portion including an input side, an output side, a plurality of entrances on the input side, a plurality of exits on the output side arranged about a central axis, and a plurality of channels fluidly interconnecting the entrances with the respective exits. Each corresponding entrance, channel and exit establish an acoustical path from the input side to the output side that is non-radial relative to the central axis. Two phasing plugs may be provided in a dual compression driver.

Abstract: A speaker includes a ferrite yoke plate, an inner magnet, a first pole member, an outer magnet, a second pole member, a diaphragm, and a voice coil. Both the inner and the outer magnets are disposed on the ferrite yoke plate, and are spaced apart from each other. The first pole member is disposed on a top of the inner magnet, while the second pole member on a top of the outer magnet. Besides, a circumference of the first pole member and a circumference of the second pole member are spaced apart from each other and define a gap. The voice coil is connected with the diaphragm, and extends axially into the gap between the two pole members. Thereby, the magnetic line of force in the speaker can be more regularly concentrated, and the driving efficiency of the voice coil be promoted, making the present invention particularly suitable for micro-speakers.

Abstract: An earpiece for communications comprises a frame, a vibration system disposed in the frame and a magnetic field system disposed in the frame. The vibration system includes a vibrating armature, a diaphragm and a connecting rod. The magnetic field system includes a magnet to generate a first magnetic field on a first axis and a coil to generate a second magnetic field on a second axis. One of the magnet and the coil is connected to the frame. The first and the second magnetic fields produce a net magnetic force to cause the vibration system to move. The first axis is parallel to the second axis.

Abstract: An acoustic mirror of alternately arranged layers of high and low acoustic impedances is manufactured in that a basic material having a first layer of the layer sequence is initially provided, on which a second layer of the layer sequence is created on the first layer such that the second layer of the layer sequence partially covers the first layer. Subsequently, a planarization layer is applied onto the layer sequence, and the planarization layer is removed in an area which in the common layer plane projects laterally beyond the second layer so as to result in a residual planarization layer. Finally, a termination layer is applied onto the layer sequence and the residual planarization layer.

Abstract: A speaker includes a magnetic circuit, frame, diaphragm, voice coil, and terminals. The frame has an opening and is coupled to the magnetic circuit, and includes a resin portion. The diaphragm is coupled to a rim of the opening of the frame. The voice coil includes lead wires and is coupled to the diaphragm, and a part of the voice coil is disposed at a magnetic gap of the magnetic circuit. The terminals are coupled to the frame by insert-molding. An outer shape formed of the frame and the terminals is one of a rectangle or a square. The resin portion of the frame has cut-away sections at corners of its outer shape. The terminals include protruding sections protruding from the cut-away sections, and the lead wires of the voice coil are connected to the protruding sections.

Abstract: The frame of a speaker is divided into a first frame part and a second frame part. The outer circumferential edge of the suspension holder is sandwiched between the surfaces of the first and second frame parts. This structure can reduce rolling of the diaphragm and harmonic distortion of the speaker.

Abstract: A speaker diaphragm is configured by a compound mixed with resin and bamboo fiber. The diaphragm satisfying the advantage of the bamboo fiber of high sound quality and a large degree of freedom in the setting of the characteristic value of the diaphragm and the advantage of the diaphragm made of a resin with improved humidity resistance reliability and strength, excellent external appearance, and enhanced productivity and dimension stability is obtained.

Abstract: A slimline speaker comprises: a magnetic circuit having a magnet and yoke disposed to form a separating space in the horizontal direction; a bobbin on which a voice coil is mounted and of which the lower side is inserted in the separating space between the magnet and yoke; a base frame for mounting the magnetic circuit; a damper having an inside edge coupled to the bobbin and an outside edge coupled to the base frame; and a diaphragm having an inside edge coupled to a point lower down than the point where the damper is coupled on the bobbin, and an outside edge coupled to the base frame.

Abstract: A speaker diaphragm is configured by a compound mixed with resin and bamboo fiber. The diaphragm satisfying the advantage of the bamboo fiber of high sound quality and a large degree of freedom in the setting of the characteristic value of the diaphragm and the advantage of the diaphragm made of a resin with improved humidity resistance reliability and strength, excellent external appearance, and enhanced productivity and dimension stability is obtained.

Abstract: A device includes a substrate and a transducer attached to the substrate, wherein the substrate includes a surface to which the transducer is attached and at least one edge member extending along at least a portion of the outside edge of the surface. The surface can be a generally planar surface. The edge member is stiffer than the surface. In several embodiments, the transducer is adapted to vibrate. The transducer can, for example, be selected from the group consisting of a piezoelectric transducer, an electrostrictive transducer and a magnetostrictive transducer. Preferably, the transducer is attached to the surface of the substrate by a metallic bonding agent and, more particularly, by welding.

Abstract: A surround that is generally arched in shape and that includes a radial exterior flange that extends downward from exterior side of the arched portion of the surround and that adhesively attaches to the inner wall or edge of the mounting ring of the frame of the loudspeaker.

Abstract: Disclosed is a multi-magnet system for speaker. The multi-magnet system includes a yoke having a bottom, a pair of main magnets separated from each other and mounted on the bottom of the yoke, respectively, a mid-magnet mounted on the bottom of the yoke and located between the pair of main magnets, and a pair of auxiliary magnets attached to two ends of the yoke. Wherein, the first main magnet together with the first auxiliary magnet and the mid-magnet defines a first magnetic gap and the second main magnet together with the second auxiliary magnet and the mid-magnet defines a second magnetic gap. By virtue of place the magnets at appropriate locations, the sensitivity of the speaker is effectively enhanced.