Abstract: An electroacoustic transducer includes a diaphragm, a tubular first sliding component which surrounds an outer peripheral portion of the diaphragm, a ring-shaped second sliding component which is attached to an outer rim of the diaphragm and slides against an inner peripheral surface of the first sliding component, and a first low-friction membrane interposed between the inner peripheral surface of the first sliding component and an outer peripheral surface of the second sliding component. The first low-friction membrane includes: a swollen body which includes a first polymer chain and a plurality of second polymer chains which branch from the first polymer chain as side chains; and a grease which permeates the second polymer chains.

Abstract: The present disclosure discloses a sounding device including a frame, a magnetic circuit system with a magnetic part and a vibration system. The vibration system includes a diaphragm fixed to the frame, a voice coil driving the diaphragm to vibrate and arranged around the magnetic part, and a metal shrapnel with conductive function. One end of the metal shrapnel is fixed to the frame and electrically connected to an external circuit, and the other end of the metal shrapnel is fixed to the voice coil and electrically connected to the lead wire of the voice coil. The metal shrapnel restrains a movement of the voice coil in a direction perpendicular to a vibration direction of the diaphragm. Compared with the related art, the sounding device disclosed by the present disclosure can reduce the number of elements to simplify the product structure.

Abstract: An acoustic device includes a main body case, a vibrating body provided inside of the main body case, a magnetic circuit unit disposed in front of the vibrating body in a sound emitting direction of the vibrating body, a coil located inside of a magnetic gap of the magnetic circuit unit, a bobbin configured to support the coil and vibrate along with the vibrating body, and a damper configured to connect the main body case to the bobbin. The damper is disposed in the rear of the vibrating body, and a damper regulation unit is provided in the rear of the damper at a position facing the damper.

Abstract: A method for manufacturing a loudspeaker includes arranging, weaving, impregnating, drying, forming, cutting and assembling steps. In the arranging step, warp yarns and wires are arranged at intervals, and the wires are grouped as a wire group. In the weaving step, weft yarns are arranged at intervals and interwoven with the warp yarns and the wires to form a base material by weaving, and an area where the weft yarns are interwoven with the wires is defined as a wire disposing area. In the forming step, a wire damper is formed on the base material by thermoforming; two elastic adjustment areas are formed at the weft yarns between both sides of the wire group and the warp yarns closest to both sides of the wire group; and widths of the elastic adjustment areas are equal to each other and larger than distances between the remaining warp yarns.

Abstract: A circular acoustic membrane having an upper surface and an opposite lower surface, said membrane being intended to be coupled, at the lower surface thereof, to a mobile winding via a support. The membrane has an annular fold concentrically delimiting, in the membrane, a circular central portion and an annular peripheral portion. In addition, the central portion has a concavity turned towards the upper surface and the internal edge of the fold is carried by the lower surface and comprises an attachment surface intended for the coupling of said support of the coil.

Abstract: A loudspeaker comprises a housing, a vibration diaphragm, a voice coil assembly, a centering support piece and a magnetic circuit system, an opening is provided at the center of the vibration diaphragm, and the voice coil assembly is fixed at the opening and is suspended in the housing; the magnetic circuit system comprises a magnetic conductive yoke fixedly connected with the housing, a magnet at one side of the magnetic conductive yoke close to the voice coil assembly, and a washer at one side of the magnet away from the magnetic conductive yoke; and a holder for supporting the centering support piece is provided on the washer, and the centering support piece is bonded and fixed to the inner wall of the voice coil assembly. By utilizing the present invention, the height of the loudspeaker can be effectively reduced, and the acoustic performance of the product can be increased.

Abstract: Disclosed is a vibration sound-producing apparatus. A sound output aperture is provided on a sidewall perpendicular to a thickness direction. A diaphragm is parallel to the plane on which the sound output aperture is located. A flat sound coil is perpendicular to the diaphragm. Two magnets parallel to the sound coil are arranged at either side of the sound coil. The vibrating direction of the sound coil avoids the thickness direction. The vibrating direction of an integral structure of the magnets and a magnetic conductor part also avoids the thickness direction. This facilitates a thickness-reduced design for a product, increases the space for vibration, and enhances product performance, meanwhile, the design of the two magnets effectively increases the strength of the magnetic field within the product, this further improving product performance. The vibration sound-producing apparatus of the present invention has the advantages of a great thickness-reduced design and great performance.

Abstract: A speaker includes: a diaphragm; and a damper configured to adjust vibration of the diaphragm and including a first and second metal plates having polarities that are different from each other and symmetrical with each other, wherein the damper further includes first and second deformation prevention members disposed on bottom surfaces of the first and second metal plates, respectively, and wherein first and second deformation prevention members protrude downward and extend along a major-axis direction of the diaphragm, and the first and second deformation members are configured to prevent deformation of diaphragm caused by a vertical load.

Abstract: Embodiments for a speaker spider of a loudspeaker are provided. The speaker spider may include a central opening and a plurality of concentric corrugations. Dimensions of the speaker spider may substantially homogenize stress on the speaker spiders during operation of the loud speaker. Dimensions of such a speaker spider that substantially homogenizes stress on the speaker spider during operation may involve one or more of (i) corrugations having azimuthally varying depths, (ii) corrugations having azimuthally varying crest and/or trough curvature radii, and (iii) corrugations having angularly varying distances from the central opening of the speaker spider, among other possibilities.

Abstract: A speaker is provided in the present disclosure. The speaker includes a magnetic circuit system, a vibration system and an auxiliary system suspending the vibration system above the magnetic circuit system. The magnetic circuit system comprises a yoke, permanent magnets assembled on the yoke, and a magnetic gap near the permanent magnets. The yoke comprises an upper surface for assembling the permanent magnets, a lower surface opposite to the upper surface, side surfaces connecting the upper surface and the lower surface, and communication conduits extending through the upper surface and the side surface to communicate the magnetic gap and the space outside the speaker.

Abstract: A speaker and method for making the same are provided. The speaker includes a permanent magnet and a coil disposed about a first axis around the permanent magnet, the coil being configured to move along the first axis. The speaker further includes a membrane attached to a top surface of the coil and a stabilizer contacting at least one of an internal surface, an external surface, and a bottom surface of the coil, and configured to limit movement of the coil relative to a second axis perpendicular to the first axis.

Abstract: A magnetic levitation audio device is disclosed. The magnetic levitation audio device comprises a magnetic levitation base capable of generating a magnetic field and a sound box levitated above the magnetic levitation base through a magnetic force. The magnetic levitation base comprises a base enclosure, an electromagnetic induction module disposed in the base enclosure, a PCB board and position indicator lamps, with the electromagnetic induction module and the position indicator lamps being electrically connected with the PCB board respectively; and the sound box comprises an enclosure, a magnet assembly disposed in the enclosure, a power supply module, an audio module, and a switch unit capable of sensing an instantaneous air flow. The present disclosure can control the sound box 20 to switch on without the need of manual operations, and this helps to improve the practicability of the magnetic levitation audio device.

Abstract: A network system is provided that includes at least one terminal and a server. The server sends at least one terminal information for inhibiting sending of data from at least one terminal. At least one terminal each sends the server at least a part of obtained data according to the information from the server.

Abstract: A magnetic coil is described. In an example, an apparatus comprises a layer of porous material and a magnetic coil. The layer of porous material comprises openings configured to pass sound waves through the layer and capture particles having a larger dimension than a width of any of the openings. The magnetic coil is configured on the layer, wherein a signal line of the coil is configured to conform to a shape of the layer so that the signal line is configured on the layer. The coil is configured to change a magnetic field of a transducer and change an orientation of the particles so as to capture the particles on the layer. In other examples, a method and a loudspeaker are described.

Abstract: A speaker device includes a voice coil, a lead wire configured to be pulled out of the voice coil, a vibrating body connecting to the voice coil, a magnetic circuit comprising a yoke, and a frame that supports the vibrating body. The yoke includes a bottom portion including a plurality of corners and a side portion extending toward the vibrating body from one side of the bottom portion. The lead wire is configured to pass through a space that is outside of and next to the side portion of the yoke and between the frame and the vibrating body. The lead wire is configured to pass above a cutout of the yoke and bend toward and through the space.

Abstract: A diaphragm for use in a loudspeaker transducer is disclosed. The loudspeaker transducer may include a voice coil, a former, a first magnet assembly having a circular inner magnet, a top plate having a annular outer top plate and a circular inner top plate, a second magnet assembly having an annular outer magnet and a circular inner magnet, an air gap defined by the circular inner magnet of the first magnet assembly, annular outer top plate, circular inner top plate, annular outer magnet and circular inner magnet of the second magnet assembly, and a surround suspension member.

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: 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 new type of sound transducer, with high output capability and compact size employs a motor in combination with a displacement amplification system using curved lamina. The motor may be electrostatic, such as piezoelectric, or electrodynamic, such as magnetostrictive, or balanced armature. Newer forms of driver materials such as PMN-PT and layered PZT or Galfenol or Terfenol-D are examples. The design exhibits high source levels, smooth frequency response and uniform directivity. Although the application described herein relates to a low frequency sound source for underwater use, the design is not restricted to low frequencies or to an underwater sound source. Both sound production and reception may be conducted. Further, diaphragmatic displacement pumps and sensors may be equipped with curved lamina, which experience a change of curvature upon excitation of their edges, and which may generate displacement of their edges due to changes of their curvature.

Abstract: A loudspeaker includes a chassis, a diaphragm, a motor system, a first suspension and a second suspension. The chassis has an inner periphery and an outer periphery. The diaphragm has an inner periphery and an outer periphery. The motor system has a magnet assembly connected to the inner periphery of the chassis, and a voice coil assembly connected to the diaphragm. The first suspension has an inner periphery connected to the outer periphery of the diaphragm, and an outer periphery connected to the outer periphery of the chassis. The second suspension has an inner periphery connected to at least one of the magnet assembly and the inner periphery of the chassis, and an outer periphery connected to the diaphragm between the inner and outer periphery.

Abstract: A damper speaker includes a fiber cloth woven by fibers, each of the fibers is formed by a single fiber strand or several fiber strands. The fiber strand includes a first fiber, which is one or a combination of cotton, polyester and aramid fiber. When the first fiber is the combination of cotton, polyester and aramid fiber, the weight ratio of any one to the fiber cloth is 0˜100%, and the weight ratio of the other two is adjusted. When the weight ratio of the first fiber to the fiber cloth is less than 100%, the fiber cloth includes a second fiber, which is one or a combination of rayon, silk, flax, acrylic, rubber and synthetic fiber. The speaker damper includes a layer of resin, which is absorbed by and combined with the fiber cloth. The fiber cloth is then cut into a predetermined shape through a molding means.

Abstract: A shaker transducer is disclosed, which comprises a magnetic unit (1) composed of a magnet (3) disposed between a first polar plate (2) and a second polar plate (4) in such a way to generate a toroidal air gap (5). A sound coil (6) is disposed in the air gap (5) to move axially and a centering element (100) is fixed to the coil to maintain it centered with respect to the magnetic unit (1). A rigid element (10) comprising a shank (12) fixed to said cylindrical support (61) of the sound coil and adapted to be anchored to a surface to transfer the sound vibrations generated by the magnetic unit (1). The centering element (100) comprises a central cylindrical shank (101) fixed to the coil, a peripheral shank (102) fixed to the second polar plate (4) and a plurality of elastic spokes (103, 103?) disposed between said central shank (101) and said peripheral shank (102).

Abstract: An improved structure for an amplifier comprises: a single member, which at least has a frame, an edge and a membrane; and a positioning shrapnel, which is assembled by an inner frame, an outer frame and a plurality of flexible braces, the outer frame is firmly disposed at the frame of the single member, the plurality of flexible braces is disposed between the inner frame and the outer frame, the inner frame is firmly disposed on the membrane of the single member, wherein the peripheral of the frame has a fillister that can be embedded in by the outer frame, each connection of any of the flexible braces and the inner frame is a curve portion that is to keep the connection of the inner frame and the outer frame while a height difference is existed between the inner frame and the outer frame.

Abstract: A loudspeaker includes an outer frame with an annular magnet partially exposed from a bottom thereof; a voice coil located inside the annular magnet; a diaphragm glued to between an expanded front opening of the outer frame and the voice coil; a flexible suspension ring having an outer edge fixed to a stepped section of the outer frame and a central opening edge clearance-fitted to a middle/front portion of the annular magnet; and an inner frame having a front portion fitted around the voice coil, a rear portion located on the central opening edge of the flexible suspension ring, and legs extended between the front and rear portions to locate in front of slots formed on the annular magnet. Therefore, the loudspeaker has reduced depth and volume, increased vibration amplitude and stability, and high quality sound output.

Abstract: An electromechanical transducer 180, motor structure 200 and voice coil winding support structure or bobbin 210 are configured to protect and transport heat away from a voice coil 220 which is would solely within the interior of bobbin 210 and configured for reciprocating movement in close proximity to an extended cooling pole piece 204. A compact, economical and efficient adaptation of a pancake style motor includes generous volume for a powerful magnet 208, while providing an extended, linear range of excursion and continuous cooling for the generously overhung voice coil 220.

Abstract: A speaker has high sound quality by reducing resonance of curved parts in a speaker damper without decreasing sound pressure and by providing high linearity characteristic. In a damper for a speaker formed by including at least two curved parts, an elastic member is provided at least on one side or on both sides of a peripheral part in a movable part of the damper or provided in the material.

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: 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: An acoustic transducer including a sound producing cone that is activated by a voice coil cylinder having a pair of spaced electrical windings that are retained in spaced relationship from a surround ferromagnetic ring that is carried by a heat sink and wherein a magnetic subassembly is mounted within the voice coil cylinder. The voice coil cylinder is supported by a pair of spaced suspension members or spiders and by the sound producing cone.

Abstract: A loudspeaker is provided in which precise alignment is obtained between the frame and motor assembly before they are connected to one another so that a voice coil coupled to the frame may be properly radially and vertically positioned with respect to a magnetic gap in the motor assembly while allowing the motor assembly and frame to be easily and quickly separated from one another to perform repairs or complete replacement of the motor assembly.

Abstract: A loudspeaker is provided in which precise alignment is obtained between the frame and motor assembly before they are connected to one another so that a voice coil coupled to the frame may be properly radially and vertically positioned with respect to a magnetic gap in the motor assembly while allowing the motor assembly and frame to be easily and quickly separated from one another to perform repairs or complete replacement of the motor assembly.

Abstract: A light weight and low profile speaker apparatus is provided. In one embodiment, the speaker apparatus includes: a frame member; a magnetic circuit; a supporting member disposed on a bottom portion of the frame member for securing and supporting the magnetic circuit at an opposite circumferential end portion of a circumferential wall portion of a first yoke relative to a plate portion; a voice coil unit disposed inside a magnetic gap in the magnetic circuit; a coupling member disposed outward of the circumferential wall portion of the first yoke; and a diaphragm having an inner circumferential end portion coupled to the coupling member. The voice coil unit and the coupling member are joined by a joint member that extends in a direction transverse to the circumferential wall portion of the first yoke; and a space where the joint member joining the voice coil unit and the coupling member can move is formed in each of the circumferential wall portion of the first yoke and the supporting member.

Abstract: A spider for high-power, compact electro-acoustic transducers comprises a non-woven fiber blend encased in a thermoplastic elastomer. The spider is capable of supporting the longer stroke distances of the high-power, compact electro-acoustic transducers and exhibits improved fatigue and ageing resistance.

Abstract: A spider arrangement for an electromagnetic vibrator includes an outer rim adapted for mounting to a supporting frame of the electromagnetic vibrator, an inner rim coaxially aligning with the outer rim for mounting to an induction coil of the electromagnetic vibrator, and a plurality of suspension arms radially and evenly extended from the inner rim to the outer rim to enable the inner rim to be moved axially in responsive to an electromagnetic force between the induction coil and a magnetic element. Each of the suspension arms provides a restoring force towards the inner rim for allowing the induction coil to alignedly move in a pistonic motion with respect to the magnetic element in a stable manner.

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 drive cone 11 and a diaphragm 14 are integrally driven by a voice coil 6 movably disposed in a magnetic gap 5. Peripheral edge portions of the drive cone 11 and the diaphragm 14 are supported by a frame 12 via different edge portions 13 and 15, respectively. The drive cone 11 is provided with a rising-up portion 11a which rises up toward an acoustic radiation direction from a inner circumferential end, and a rising-down portion 11b which rises down toward a direction reverse to the acoustic radiation direction. An inner circumferential edge of the diaphragm 14 is fixed at an annular top formed between the rising-up portion and the rising-down portion. Moreover, a first rib 11c and a second rib 11d are formed on the drive cone 11 in such a manner as to rise up toward the acoustic radiation direction integrally with the drive cone. The diaphragm 14 is supported also at the tips of the ribs.

Abstract: A speaker device includes a damper allowing high linearity. The speaker device includes a vibration body including a damper and a voice coil bobbin (bobbin), and a magnetic circuit having a plate. The damper has a first member arranged opposite the plate, and a second member projecting on a side of the plate from the first member. The first member has a movable part elastically supporting the bobbin. The movable part is a flat plate, and behaves with respect to a bent part provided between the movable part and the second member with movement of the bobbin in an acoustic radiation direction and reverse. Therefore, when a constant force is given to the damper via the voice coil, a displacement of the damper with respect to a rest position can be substantially similar in such a case that the damper behaves in the acoustic radiation direction and the reverse.

Abstract: A voice coil 6 is movably disposed in a magnetic gap 5. A drive cone (first diaphragm) 11 and a diaphragm (second diaphragm) 14 are integrally driven by the voice coil 6. Peripheral edge portion of the drive cone 11 and the diaphragm 14 are supported by a frame 12 through edge portions 13 and 15, respectively. An annular adhesive receiver 8 is disposed in a peripheral surface of a voice coil bobbin 7 around which the voice coil 6 is wound, and an inner peripheral edge 11a of the drive cone 11 is accommodated in the adhesive receiver 8. The drive cone 11, the adhesive receiver 8 and the voice coil bobbin 7 are connected to each other by an adhesive filled into the adhesive receiver 8.

Abstract: A diaphragm unit is arranged to be used in a loudspeaker including a frame. The diaphragm includes a diaphragm and an edge joined to an outer periphery of the diaphragm. The diaphragm extends in a longitudinal direction and has a first center line extends along the longitudinal direction. The edge has an outer periphery being arranged to join to the frame, and an inner periphery joined to the outer periphery of the diaphragm. The edge has a convex surface having substantially a semi-circular cross section. The convex surface of the edge has grooves provided therein. The grooves extend from the inner periphery of the edge to the outer periphery of the edge. The grooves have cross sections each having a U-shape or a V-shape, and are arranged symmetrically about the first center line of the diaphragm. This diaphragm unit provides an elongated loudspeaker reproducing bass sounds with small distortions.

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: A speaker having smaller distortion and driven at higher efficiency is disclosed. The speaker includes a frame, a magnetic circuit supported by the frame, a voice coil unit placed movable with respect to magnetic gap provided to the magnetic circuit, a diaphragm of which outer rim is coupled to the frame via a first edge, and of which inner rim is coupled to the voice coil unit, and a damper placed on the magnetic circuit side with respect to the diaphragm, and which damper has an outer rim coupled to the frame and an inner rim coupled to the voice coil unit. The outer rim of the damper is coupled to the frame via a second edge, which includes a first protrusion protruding toward the diaphragm and a second protrusion protruding oppositely to the first protrusion.

Abstract: Speaker damper (12) used in a speaker including frame (5), magnetic circuit (1) coupled to frame (5), voice coil unit (2) inserted into magnetic gap (8) provided in magnetic circuit (1), and diaphragm (3) coupled to frame (5) and voice coil unit (2) at its outer and inner peripheral ends, respectively. Speaker damper (12) is coupled to voice coil unit (2) and frame (5) at its inner and outer peripheral ends, respectively, and has first supporting portion (10) having a first elastic modulus at its inner peripheral end and second supporting portion (11) having a second elastic modulus different from the first elastic modulus at the outer peripheral side of first supporting portion (10). This configuration can reduce the distortion of a speaker, even if the amplitude amount of voice coil unit (2) becomes large, and a large load is not applied to vibrating voice coil unit (2).

Abstract: An electroacoustical transducer includes a bobbin, a first acoustic radiator coupled to the bobbin through a first surround having a mechanical compliance, a second acoustic radiator generally rigidly coupled to the bobbin, and a basket. The first acoustic radiator is coupled to the basket through a second surround, and the second acoustic radiator is coupled to the basket through a third surround. The first surround is constructed to cause the first acoustic radiator to move out of phase with the second acoustic radiator relative to the bobbin when actuated by the bobbin at acoustic frequencies at and above a resonant frequency of the first acoustic radiator.

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: 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 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: 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: A speaker apparatus comprises: a drive cone transferring a drive power of a voice coil to the diaphragm; a diaphragm disposed in a driving direction; and a diaphragm disposed in a driving direction. The drive cone is fixed to a diaphragm support of a frame. An outer circumference of the diaphragm is fixed to the diaphragm support of the frame. An outer circumference of the diaphragm is fixed to the diaphragm support of the frame. The diaphragm, the drive cone and the frame surround a sealed space where the diaphragm and the drive cone are connected through a non-ring-shaped connection piece. A vibration system is supported through a voice coil bobbin by a spring property of air contained in the sealed space.

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: An edge (29) for supporting a diaphragm assembly (100) with respect to a frame (26) is bonded to the frame (26) along the outer periphery thereof and joined to a diaphragm (27) in a position more peripherally inward than a voice coil (28) along the inner periphery thereof. The edge (29) partly overlaps diaphragm (27). This structure allows downsizing of the speaker, without reducing the sizes of a permanent magnet (21) and the edge (29).