Abstract: To provide a speaker unit and a portable information terminal that are reduced in size and thickness and still produce a high sound pressure. A speaker unit includes: a yoke having a rectangular outline as seen in a plan view; a magnet member placed on the yoke and magnetized so that an upper surface of the magnet member has an N pole and an S pole aligned in one direction; a coil placed above and spaced from the upper surface of the magnet member; a diaphragm attached to the coil; and a frame supporting the diaphragm. An engagement protrusion which allows the frame and the yoke to engage with each other is provided on a side which is one of the sides defining the rectangular outline of the yoke and extends along the one direction.

Abstract: [Problem] To provide a speaker unit and a portable information terminal that are reduced in size and thickness and still produce a high sound pressure. [Solving Means] A speaker unit includes: a yoke having a rectangular outline as seen in a plan view; a magnet member placed on the yoke and magnetized so that an upper surface of the magnet member has an N pole and an S pole aligned in one direction; a coil placed above and spaced from the upper surface of the magnet member; a diaphragm attached to the coil; and a frame supporting the diaphragm. The yoke includes an attachment which protrudes upward from an outer periphery of the yoke for attachment to the frame. The attachment has a recess at least in a central portion of the attachment 6 which crosses the one direction.

Abstract: An integrated multifunctional micro speaker including a speaker frame having an upper portion (an outer portion) that is configured by a moving voice coil type speaker and a lower portion (an inner portion) that is configured by a moving magnet and weight type vibrator supported by a suspension, thereby reproducing a sound and a vibration.

Abstract: A high efficiency loudspeaker without a damper is provided. The loudspeaker includes magnetic circuit having a magnetic gap and a voice coil member, which has movable coil, disposed in the magnetic gap of the magnetic circuit. The loudspeaker also includes a diaphragm, whose inner peripheral part is linked with the voice coil member, outside the magnetic gap and a frame linked with an outer peripheral part of the diaphragm via a first edge. An inner peripheral part of a suspension holder is linked with the voice coil member at a linked position which is closer to the magnetic circuit than a linked position of the diaphragm and the voice coil member. An outer peripheral part of the suspension holder is linked with a frame via a second edge. The first edge and the second edge are substantially symmetrical with each other about a median of a first edge and a second edge.

Abstract: A diaphragm and a speaker unit which can prevent generation of abnormal sound by suppressing rolling phenomenon. The speaker unit has a diaphragm. The diaphragm includes a portion for supporting a voice coil, and a sound emitting portion formed continuously to one end thereof. The voice coil supporting portion has a shape extending reversely to the sound emitting direction. The sound emitting portion includes a step portion having a surface substantially perpendicular to the sound emitting direction, and a bent portion having a cross-section bent toward the inside of the voice coil supporting portion from one end of the step portion.

Abstract: Loudspeaker has frame, magnetic circuit, voice coil, diaphragm, first combination and second combination. First combination and second combination are both provided closer to magnetic circuit than diaphragm, the inner rims of which are connected to voice coil while the outer rims are to frame. First combination has first damper and first edge wherein first edge has first edge protrusion protruding in a direction toward diaphragm. Second combination has second damper and second edge wherein second edge has second edge protrusion protruding in an opposite direction to the protruding direction of first edge protrusion This structure obtains loudspeaker that distortion is suppressed and weight reduction is easy for an excursion part thus improved in driving efficiency.

Abstract: The invention relates to a small speaker. A speaker 1 comprises: a magnetic circuit 3 having a yoke 7, a magnet 15, and a pole piece 16; a vibration system 4 having a voice coil 18 and diaphragm 19 which are joined to each other through a voice coil bobbin 23; and a frame 2 which holds the magnetic circuit 3 and the vibration system. The voice coil is placed in a magnetic gap 17. In the speaker, dampers 26 which are extended respectively from a plurality of places of an opening side end portion of the voice coil bobbin are disposed, and tip end portions of said dampers are bonded and fixed to the frame. The voice coil bobbin is supported from the lower side. The resistance to input is improved without impairing the thinness of the speaker 1, and while suppressing the increase of the production cost.

Abstract: A multifunctional micro speaker including a frame; a diaphragm having an outer circumferential portion fixed to the frame; a voice coil fixed to a lower surface of the diaphragm; a first suspension having one side fixed to the frame and having a predetermined elasticity; a yoke fixed to the first suspension and including a receiving groove; a first permanent magnet fixed to a bottom surface of the receiving groove; a plate fixed to an upper surface of the first permanent magnet; a second suspension having one side fixed to the frame, spaced apart from the first suspension in a downwards direction, and having a predetermined elasticity; and a second magnet fixed to the second suspension and spaced apart from the first suspension, wherein the first suspension and the second suspension have a plate shape, wherein at least one lateral surface of the first suspension is magnetized by the first permanent magnet, and wherein at least one lateral surface of the second suspension is magnetized by the second magnet.

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 structure of a loudspeaker is designed to decrease a thickness or height thereof, thereby reducing a mounting depth of the loudspeaker on a mounting panel or wall. The loudspeaker includes a speaker frame, a diaphragm connected to the speaker frame in a manner capable of vibration, a voice coil connected to the diaphragm through a coil bobbin to receive an electric signal to vibrate the diaphragm, a spider connected to the speaker frame and to the diaphragm for supporting the diaphragm and the voice coil in a flexible manner, a magnetic assembly including a top plate, a permanent magnet and a pole piece for creating a magnetic circuit for interaction with the voice coil inserted in an air gap, and a plurality of cut-outs formed on a top of the magnetic assembly at an outside thereof to receive therein corresponding suspension elements of the spider.

Abstract: A multifunctional micro speaker including a frame; a diaphragm having an outer circumferential portion fixed to the frame; a voice coil fixed to a lower surface of the diaphragm; a first member having one side fixed to the frame and having a predetermined elasticity; a yoke fixed to the first member and comprising a receiving groove; a first permanent magnet fixed to a bottom surface of the receiving groove; a plate fixed to an upper surface of the first permanent magnet; a second member having one side fixed to the frame, spaced apart from the first member in a downwards direction and having a predetermined elasticity; and a second magnet fixed to the second member and spaced apart from the first member and the yoke.

Abstract: A multifunctional micro speaker including a frame including a lower plate portion and a lateral wall portion; a diaphragm having an outer circumferential portion that is fixed to the lateral wall portion of the frame; a voice coil fixed to a lower surface of the diaphragm; a suspension including a central portion and a supporting portion, wherein the central portion has a lower surface that is closely fixed to a lower plate member disposed in a lower portion of the frame, and the supporting portion extends from at least a portion of an outer circumferential portion of the central portion and is bent; a yoke fixed to the supporting portion of the suspension; a permanent magnet fixed to a bottom surface of the yoke; and a plate fixed to an upper surface of the permanent magnet.

Abstract: A diaphragm of a speaker device, formed into an elongated configuration, has a recessed shape and includes a voice coil arrangement part extending in its longitude direction. The voice coil arrangement part has a gap with a constant width in its lateral direction and includes a voice coil supporting part for supporting a voice coil and an expanded part provided at a position along it.

Abstract: A speaker device prevents “squeaking” based on the difference between propagation speed of a vibration propagated through a center cap and propagation speed of a vibration propagated through a diaphragm. The speaker device includes a vibrating body (VB), a driving part (magnetic circuit) driving the VB, and a frame supporting the VB and the driving part (magnetic circuit). The VB includes a voice coil (VC), a VC supporting part supporting the VC, a diaphragm group, and a driving member whose inner circumference portion is supported by the VC supporting part and which transmits VC vibration to the diaphragm group. The driving member includes a supporting part supporting the diaphragm group. A first connecting part is provided between the diaphragm group and the driving member and on the inner side with respect to the supporting part. The diaphragm group is connected to the driving member via the first connecting part.

Abstract: A loudspeaker device comprising: a loudspeaker and a reflecting member positioned opposite to the loudspeaker, the loudspeaker comprising an electromagnet actuator, a dish-like frame and a vibrating drum, the electromagnetic actuator being attached on one side of the frame, the vibrating drum adhered to an inner side of the dish-like frame, the electromagnetic actuator being configured for driving the vibrating drum to vibrate, the vibrating drum being configured for generating sound of different frequencies and intensities; and the reflecting member shaped in a bowl configuration, comprising a concave shaped reflecting surface opposite to the vibrating drum; wherein the area of the reflecting surface is larger than an area of the vibrating drum.

Abstract: An ultra low frequency transducer or subwoofer for automotive speaker systems with a polygonal, concave diaphragm. The periphery preferably is sized to be substantially coextensive with the front of the speaker housing or cabinet. In this way, air displacement in the subwoofer is maximized for a given size of enclosure, and thus so is the loudness of the speaker. The transducer typically includes a frame or basket with a polygonal front for supporting the periphery of the diaphragm. The preferred diaphragm includes a convex surround with pleated corners. For increased durability, trusses are formed in the diaphragm.

Abstract: A loudspeaker includes a diaphragm and an edge having an inner periphery end portion thereof connected with an outer periphery of the diaphragm, in which an outer end portion of the edge is attached to a speaker frame. The diaphragm has a bent portion in the vicinity of a border at the inner periphery side of a connecting portion connecting the diaphragm with the edge. A reinforcing portion is formed on the bent portion in order to reinforce the bent portion. It is, therefore, possible to disperse or reduce various forces applied to the bent portion, and to prevent strength deterioration or damage of the diaphragm even when sound signals having large amplitude are applied to the loudspeaker. As a result, it is also possible to prevent deterioration of acoustic characteristics.

Abstract: A loudspeaker includes a movable diaphragm, a resilient centering device for centering and guiding the movement of the diaphragm, and a magnet system for controlling the movement of the diaphragm, where the diaphragm is positioned between the magnet system and the resilient centering device.

Abstract: A piezoelectric speaker comprises a plurality of diaphragms, connecting components, and piezoelectric elements. The plurality of diaphragms are each formed by a laminated material in which a core layer made of an insulating material is laminated to skin layers each made of a conductive material so as to form the skin layers on both surfaces of the core layer. The connecting components each corresponds to a plate-shaped component of the insulating material and connects between at least two of the plurality of diaphragms. Piezoelectric elements are mounted on surfaces of the plurality of diaphragms, respectively. The plurality of diaphragms are insulated from each other such that separate voltages are applied to the piezoelectric elements mounted thereon, respectively.

Abstract: A microphone unit (1) has a first vibration plate. A support member (6) supports the microphone unit (1). A second vibration plate (5) is fixed to the support member (6) at a predetermined distance from the first vibration plate. An armoring body (2) covers the microphone unit (1), the support member (6) and the second vibration plate (5). A space surrounded by the support member (6), the first vibration plate and the second vibration plate (5) is a closed space (S1) with air kept therein.

Abstract: An uncured fluid adhesive is charged into a groove surrounding the outer circumference of a voice coil so that the inner circumferential edge of a diaphragm is immersed in the adhesive. The cured adhesive securely bonds the diaphragm to the voice coil, and thus the diaphragm can be driven at high output.

Abstract: An electromagnetic converter includes a magnetic circuit having permanent magnets, a lower frame for fixing magnetic pole faces of these permanent magnets thereto, an upper frame having an opening formed therein on a side of the other magnetic pole faces of the permanent magnets and plates fixed to the other magnetic pole faces, and a diaphragm having a voice coil pattern arranged on side portions thereof in a direction of the length thereof and on a top portion thereof in a direction of the width thereof. Protruding portions join between these side portions. The periphery of the top portion is joined to the periphery of the opening of the upper frame via an upper gasket. A flange at the edges of the four side portions is joined to an inner surface of the upper frame, i.e., an inner portion of the magnetic circuit via a lower gasket.

Abstract: The invention is intended to enhance the driving efficiency in a speaker being less in distortion. In order to achieve the purpose, there is provided a damper disposed rather closer to a magnetic circuit than the diaphragm, of which the inner rim is connected to a voice coil body, and the outer rim of the damper is connected to the frame via the second edge. The second edge is protruded toward the diaphragm or the opposite side thereof. The damper has such a structure that the first protrusion protruding toward the diaphragm and the second protrusion protruding in a direction opposite to the first protrusion are alternately repeated in a plurality of times, and the first protrusion and the second protrusion are different in size from each other. The smaller protrusion out of the first and second protrusions is same in protruding direction as the second edge.

Abstract: To provide a thin speaker device capable of emitting a loud reproduced sound with a comparatively simple structure, and to input the audio signal to the voice coil not to have an adverse effect on the vibration of the voice coil is executed. A speaker device includes a vibration direction converter part transmitting the vibration of the voice coil to the diaphragm, and a holding part holding the voice coil at the static part such that the voice coil vibrates linearly, and the audio signal inputted to an audio signal input terminal provided at the static part is inputted to the voice coil via the holding part.

Abstract: A vibrating body for an acoustic transducer is provided, in which the high resonance frequency associated with inverse resonance can be outside the audible range and which can improve the acoustic characteristic of a speaker device. The vibrating body 1 for an acoustic transducer includes: a diaphragm 2 including a first vibrating part 2a and a second vibrating part 2b formed in proximity of the outer circumferential edge of the first vibrating part 2a; and an edge portion 3 formed in proximity of the outer circumferential edge of the diaphragm 2. In the vibrating body 1 for an acoustic transducer, first reinforcing portions 6a and 6b are formed so as to extend from the second vibrating part 2b to the edge portion 3 in a radial direction.

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 centre 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: An audio speaker having a removable voice coil, which may be a part of a voice coil assembly. The voice coil may be user-removable to facilitate replacement of a damaged voice coil or reconfiguration of a speaker system. Properly positioning the voice coil assembly may provide a solder-free electrical connection between the voice coil and leads that provide current to the voice coil. In some embodiments, the voice coil is user-removably attached to an inner circumferential surface of a diaphragm. In other embodiments, the voice coil is connected to the diaphragm, and the voice coil assembly and the diaphragm are both user-removably attached to a frame.

Abstract: The invention refers to a device (3) for actuating a membrane arranged in an opening to a space, and a vehicle having such a device. The membrane (1) has a first surface (1?) and a second opposite surface (1?), and is limited by an edge area. The device includes a first strip (5) to be attached to the first surface of the membrane in the edge area, and a second strip (6) to be attached to a surface of a frame portion extending around the opening. An exchanging number (8) is arranged between and connecting the first strip with the second strip. An actuating member (20) is arranged to transfer a reciprocating primary movement to the exchanging member converting the primary movement to a reciprocating secondary movement, which has a longer length of stroke than the primary movement and acts on the strips to move towards and away from each other.

Abstract: The present invention provides a sensory signal output apparatus wherein a coil is disposed in the gap between a magnet/top plate and a yoke, and a portion elastically supported in the free space vibrates in reaction to the magnetic flux generated in the gap in accordance with the direction of the alternating current signal applied to the coil to generate sound and/or vibration, wherein the yoke has a groove formed at a side other than that with the magnet, and the groove has a diameter smaller than that of the magnet, and an inner edge portion with a magnetic fluid. The sensory signal output apparatus of the present invention improves the position retaining force of the magnetic fluid and reduces the deformation of the magnetic fluid, as the magnetic fluid is formed in the edge of the groove of the yoke corresponding to the edge portion of the magnet which has a relatively bigger magnetic force and magnetic field than the plane portion of the magnet.

Abstract: A speaker device includes a diaphragm (2), frame (3) vibratably supporting the diaphragm (2) in the vibration direction, and a driving part (4) provided at the frame (3), applying vibration to the diaphragm (2) in response to an audio signal. The driving part (4) includes a magnetic circuit (40) forming a magnetic gap (40G) in a different direction in respect with the vibration direction of the diaphragm (2), a voice coil support part (6) having a voice coil (60) and vibrating along the magnetic gap (40G), and a vibration direction converter part (7) direction converting the vibration of the voice coil support part (6) and transmitting the vibration to the diaphragm (2). The magnetic circuit (40) includes a pair of magnetic gaps (40G, 40G) having different directions of magnetic flux.

Abstract: A suspension member for a diaphragm, the suspension member comprising an inner portion being adapted to be attached to a substantially stiff piston part, a outer portion arranged on or integrated with a substantially stiff support member so as to mechanically stabilize the suspension member, and a flexible member connecting the inner and outer portions. The present invention further relates to an electro-acoustic transducer, preferably a miniature electro-acoustic transducer, applying such suspension member.

Abstract: A loudspeaker includes a frame; a magnetic circuit supported by the frame; a voice coil disposed in a magnetic gap of the magnetic circuit so as to be able to vibrate freely in the gap; a diaphragm connected to the frame at the outer rim thereof via a first edge and connected to the voice coil at the inner rim thereof; a damper connected to the voice coil at the inner rim thereof, the damper being closer to the magnetic circuit than the diaphragm is close to the magnetic circuit; and a second edge connecting the outer rim of the damper to the frame. The second edge has a protrusion protruding either toward the diaphragm or in the opposite direction. The second edge is coupled to a third edge having a protrusion protruding at least in the opposite direction in which the protrusion of the second edge protrudes. This structure enables the loudspeaker to have little distortion and high driving efficiency.

Abstract: The production of a hearing aid device can be simplified by the use of a microphone module with a plurality of microphones. To attach and electrically contact the microphones, the invention provides a microphone carrier with three-dimensionally directed conductor traces in MID technology. In a complicated microphone arrangement with a plurality of microphones, a single microphone module can thereby be used on which all microphones of the hearing aid device are attached and electrically connected.

Abstract: In an electroacoustic transducer, abnormal resonance caused by end reflected waves in the bonding portion of a diaphragm and a unit frame is prevented. The electroacoustic transducer includes the diaphragm having a center dome and a sub dome, and a unit frame 30 for oscillatably supporting the diaphragm, and a flat flange part formed at the peripheral edge of the sub dome is attached to a support face 33 of the unit frame 30 via an adhesive. In the electroacoustic transducer, the support face 33 for the flange part includes a first boss group 331 in which first bosses 331a are arranged at predetermined intervals along an inside end 33a of the support face 33, and a second boss group 332 in which second bosses 332a each having a diameter larger than that of the first boss are arranged at predetermined intervals around the first boss group 331. Also, the bonding area of the support face 33 and the flange part increases gradually from the inside end 33a of the support face 33 to an outside end 33b thereof.

Abstract: A transducer for a hearing aid includes a housing, a relatively thin membrane having a free end suspended in the housing for vibration in response to a motor. The motor has a coil and a magnet assembly, the coil being mounted in the housing beneath the membrane; the magnet assembly being mounted in the housing coaxially with the coil and to one edge of the membrane.

Abstract: The present invention is to provide a speaker magnetic circuit which, even if small in its thickness, can reduce an occurrence of magnetic flux leakage so as to obtain a sufficient magnetic flux density in a magnetic gap, particularly in a position where a voice coil is supported. The speaker magnetic circuit (11) comprises a yoke (12) and a magnet group (13). The magnet group (13) comprises outer magnets (21-24) and inner magnets (25-28). The outer magnets (21-24) and the inner magnets (25-28) are magnetized in an oblique direction with respect to their thickness direction.

Abstract: In a loud speaker, the diaphragm has a protruded part protruding on a yoke side on the inside and in the vicinity of an inner coupling part as a coupled portion to a voice coil. The loud speaker can be manufactured with the voice coil accurately positioned with respect to a diaphragm, and the voice coil is accurately vibrated vertically inside a magnetic gap. The possibility of the voice coil coming into contact with a plate and a yoke as a magnetic circuit body of the loud speaker can be reduced, thereby to improve production efficiency and a yield at the time of manufacturing the loud speaker.

Abstract: A loudspeaker cone body made of plastic includes a base carrier material and a filler material. The base carrier material is selected to optimize overall flow, weight and stiffness. The filler material may be a nanomaterial that provides for adjustment of process and acoustic related characteristics in the loudspeaker cone body that become relevant when the loudspeaker cone body is operated in a loudspeaker. Acoustic related characteristics that may be adjusted include a stiffness to weight ratio and an acoustic damping of the loudspeaker cone body. A predetermined weight percent of the filler material may be combined with the base carrier material to obtain repeatable desired acoustic related characteristics. The acoustic related characteristics may be adjusted by changing the predetermined weight percent of the filler material.

Abstract: A damper has ridges and furrows thereon and a through hole therein. The damper includes a carbon nanotube film structure and an amorphous carbon structure. The carbon nanotube film structure defines a number of micropores therein. The amorphous carbon structure is composited with the carbon nanotube structure. The amorphous carbon structure comprises a number of amorphous carbon particles received in the micropores.

Abstract: A vibrating element (1) for an electroacoustic transducer, particularly for a loudspeaker, is provided, comprising a diaphragm (2) with at least two electrically conductive areas (3a, 3b) separated from each other, and with a recess (4). In the recess (4) a coil (5) is arranged with two connecting leads (6a, 6b), which are electrically contacted with one conductive area each (3a, 3b). The contact points (8a . . . 8d) are then located in the area of the recess (4). Furthermore, a method for the manufacturing of a vibrating element (1) is provided. The recess (4), the inserting of the coil (5) into the recess (4) as well as optionally the contacting of connecting leads (6a, 6b) with the conductive areas (3a, 3b) can then take place in one process step.

Abstract: A loudspeaker has a frame, a magnetic circuit, a voice coil body, a first edge, a diaphragm, a second edge, and a damper. The magnetic circuit is provided with a magnetic gap, and is supported by the frame. The voice coil body is disposed movably with respect to the magnetic gap. The outer peripheral end of the diaphragm is coupled to the frame via the first edge, and the inner peripheral end thereof is coupled to the voice coil body. The second edge is coupled to the frame at a position closer to the magnetic circuit than the first edge. The damper is disposed closer to the magnetic circuit than the diaphragm, the outer peripheral end thereof is coupled to the frame via the second edge, and the inner peripheral end thereof is coupled to the voice coil body.

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 ultra low frequency transducer or subwoofer for automotive speaker systems with a rectangular or square or otherwise polygonal diaphragm. The basket of the transducer has a correspondingly polygonal front, which preferably is sized to be substantially coextensive with the front of the speaker housing or cabinet. In this way, air displacement in the subwoofer is maximized for a given size of enclosure, and thus so is the loudness of the speaker. The preferred diaphragm is concave, and the transducer preferably includes a convex surround with pleated corners. For increased durability, trusses are formed in the diaphragm.

Abstract: A push-pull magnetic-planar acoustic transducer provides easy field replacement of a diaphragm. Push-pull magnetic-planar acoustic transducers are known for the relative vulnerability of their diaphragms to damage. Replacement of the transducers in the field as been problematic because of the high repulsive force between the front and back panels and the need to obtain even tension across the diaphragm. The push-pull transducer assembly incorporates an edge hinge on which the panels can be pivoted to bring the panels into facing positions and a plurality of set screws to be fitted around the perimeter of the panels allowing essentially flat closure of the panels on one another to a working spacing engaging the diaphragm.

Abstract: A damper includes at least one matrix and at least one carbon nanotube structure disposed on at least one surface of the at least one matrix. A loudspeaker using the damper is also disclosed. The loudspeaker includes a frame, a diaphragm secured on the frame, a bobbin having a voice coil, and a damper. The bobbin is secured to the diaphragm. The damper has a first engaging surface engaged with the frame and a second engaging surface engaged with the bobbin.

Abstract: Provided is a faceplate for an In-The-Ear (ITE) hearing aid and a method of manufacturing a faceplate for an In-The-Ear (ITE) hearing aid in which the faceplate can be manufactured in a compact size, using a foldable flexible printed circuit board (PCB), while maintaining the quality, enabling mass-production, and reducing the manufacturing cost.

Abstract: In an electroacoustic transducer (21) with a stationary transducer part (23) and with a membrane configuration (17) comprising a membrane (15) and a handling ring (1) for the membrane (15) connected with the membrane (15), the membrane configuration (17) is connected with the stationary transducer part (23) via the handling ring (1), and the handling ring (1) and membrane (15) are connected together via an interlocking connection.

Abstract: A loudspeaker includes a circular damper, a cone, and a cylindrical bobbin. The circular damper may include a centrally disposed cone attachment protuberance and a peripherally disposed top plate attachment section. The cone may have a central inner portion that may be attached to the cone attachment protuberance of the damper. The cone may be attached to the cylindrical bobbin, which may have a voice coil coupled thereto.

Abstract: A speaker is disclosed in which a split resonance of a diaphragm main body and a natural resonance of an edge are controlled, achieving a high sound quality while realizing a weight reduction. A diaphragm is composed of a diaphragm main body and an edge. An outer peripheral part of the diaphragm main body is bonded with a peripheral edge of a frame through the edge. An external shape of edge is formed in substantially a perfect circle. While, at least one of the outer peripheral part of the diaphragm main body and an inner peripheral part of the edge, which is a mutual bonding portion, is formed in a different shape than the perfect circle.