Abstract: A loudspeaker includes: a magnetic circuit assembly with a magnetic flux space; a vibrating diaphragm covering a first end of the magnetic flux space; and a voice coil assembly in the magnetic flux space and coupled to a side of the vibrating diaphragm facing the magnetic flux space. The voice coil assembly includes at least one group of conductive coils and a heat accumulator in thermally conductive contact with the at least one group of conductive coils, and the heat accumulator absorbs and accumulates heat when a temperature of the voice coil assembly reaches a target temperature.

Abstract: A forced ventilation woofer or electromechanical transducer (e.g., 200 or 300) includes a motor structure and voice coil winding support structure or former (203 or 303) configured with a vented annular spacer (e.g., 250) and vented distal pole tip member (e.g., 255) having aligned radial channels aimed to transport heat away from a voice coil (202 or 302) during the transducer's reciprocating movement while providing an extended, linear dynamic range and continuous cooling for the voice coil. A dual magnetic gap embodiment has an inside annular spacer member (e.g., 355A) and a co-planar outside annular spacer member (e.g., 350-O), each made of a thermally conductive steel alloy.

Abstract: The present invention relates to principles for cooling the stationary winding of an induction motor, said winding being positioned outside the movable armature. The cooling can be achieved by means of cooling fins, openings allowing the ventilation of the winding with or without a fan, a fluid circuit outside the bowl, a fluid circuit inside the bowl, a fluid circuit inside the winding, and/or the addition of heat pipes inside the bowl. This motor as presented can be used, without limitation, inside loudspeakers or vibrators.

Abstract: Provided are communication devices having adaptable features and methods for implementation. One device includes at least one adaptable component and a processor configured to detect an external cue relevant to operation of the at least one adaptable component, to determine a desired state for the at least one adaptable component corresponding to the external cue, and then to dynamically adapt the at least one adaptable component to substantially produce the desired state. One adaptable component comprises at least one adaptable speaker system. Another adaptable component comprises at least one adaptable antenna.

Abstract: A speaker device includes: a housing provided with an accommodating space, and a sounding member accommodated in the accommodating space. The sounding member includes a magnetic circuit unit and a vibration unit provided with a diaphragm. The housing includes an upper housing and a lower housing. The lower housing includes: a metal bottom wall, lower metal side walls, and, and sealing connectors respectively provided between two adjacent lower metal side walls of the plurality of lower metal side walls. An end of the lower metal side wall close to the upper housing bends and extends in a direction perpendicular to a vibrating direction of the diaphragm to form a bending edge. The bending edge and a bottom surface of the sealing connectors jointly form a sealing surface. The sealing surface is connected to the upper housing to seal. The speaker device can increase the powder filling space.

Abstract: This application provides a speaker and a mobile terminal. The speaker includes a housing and a kernel located in the housing, where there is a front cavity and a rear cavity in the housing, the front cavity is in communication with the outside, and the rear cavity is an isolated cavity. In addition, to reduce a space area occupied by the entire speaker, the front cavity and the rear cavity are disposed in a stacked manner when being disposed. Specifically, the front cavity and the rear cavity are at least partially stacked along a thickness direction of the kernel. Therefore, the rear cavity is disposed in space of the entire speaker in the thickness direction of the kernel, to reduce an area occupied by the entire speaker in the mobile terminal on the premise that a size of the rear cavity meets a requirement.

Abstract: An acoustic diaphragm 1 according to the present invention includes a center dome member, and a sub dome member. The center dome member includes a center dome 2 and an annular first plane part 2a that is disposed along the outer periphery of the center dome and formed integrally with the center dome. The sub dome member includes a sub dome 3 and an annular second plane part 3a that is disposed along the inner periphery of the sub dome and formed integrally with the sub dome. The first plane part includes a rising part 2b of the center dome, a first front surface, and a first back surface. The second plane part includes an inner peripheral edge 3b, a second front surface, and a second back surface. The center dome is formed of a material different from that of the sub dome. The sub dome surrounds the periphery of the center dome. The inner peripheral edge coincides with the rising part. The first front surface is joined to the second back surface.

Abstract: The present invention is intended to provide a sound generating actuator which can facilitate heat dissipation from a voice coil. According to the present invention, there is provided a sound generating actuator, including: a frame; a stationary part mounted on the frame and provided with a yoke, a magnet and a top plate to compose a magnetic circuit; a voice coil configured to receive an electrical signal and vibrate due to a magnetic field and mutual electromagnetic force of the stationary part; a spring configured to dampen vibration of the voice coil and that is made of a metallic material and secured to the frame; and a contact pad that is attached to the spring and configured to transfer vibration of the voice coil.

Abstract: A dual suspension edge member structure for a radiation device, a dual suspension edge loudspeaker and a loudspeaker box. The radiation device comprises an outer supporting frame, a vibration element, a first suspension edge member extending between the vibration element and the outer supporting frame, an inner frame connected to the vibration element, an outer holding frame, and a second suspension edge member connected between the inner frame and the outer holding frame. The dual suspension edge member structure of the radiation device for making the dual suspension edge loudspeaker or loudspeaker box prevents shaking and shifting of the vibration element to improve the sound effect quality.

Abstract: The present disclosure discloses a speaker, including a holder, a magnetic circuit unit and a vibration unit arranged in the holder, the vibration unit comprises a suspension fixed at the holder, a dome fixed at a center of the suspension and a voice coil connected to the dome, the dome is provided with recesses formed by recessing from the dome towards the magnetic circuit unit, a spacing is formed between at least two of the recesses, and the voice coil abuts against bottom walls of the recesses and forms a leakage passage with the dome at the spacing. The leakage passage enables a difference of internal and external air pressures of the voice coil to be effectively reduced after an amplitude of the vibration unit is increased; the voice coil becomes short and thick, and thus a magnetic flux is increased and structural strength of the dome itself is improved.

Abstract: A vibration device, including a housing having accommodating space, a vibrator, a stator and an elastic member accommodated in the housing. One of the vibrator and the stator includes a magnetic circuit unit while the other includes a coil, the vibrator includes a supporting frame fixed to the elastic member and suspended in the accommodating space by the elastic member, the supporting frame includes an accommodating cavity and, a coil or a magnetic circuit unit fixed and accommodated in the accommodating cavity. One end of the elastic member is fixedly connected with the supporting frame while anther end is fixedly connected with the housing. The supporting frame includes opposite first side walls and a second side wall forming an accommodating cavity, the first side wall is fixedly connected with the elastic member. A protrusion extends from the first side wall to the elastic member fixedly connected with the protrusion.

Abstract: A terminal component is applied to a speaker, and includes two terminals, a sleeve seat, and two fixing heads. Each terminal includes a terminal head and a terminal body. The sleeve seat includes two terminal blocks. The two terminal blocks respectively accommodate the two terminal bodies, so that the two terminal heads are exposed outside the sleeve seat. The two fixing heads are respectively combined with the two terminal heads, to respectively fasten two wires to the two terminals.

Abstract: A dual suspension edge member structure for a radiation device, a dual suspension edge loudspeaker and a loudspeaker box. The radiation device comprises an outer supporting frame, a vibration element, a first suspension edge member extending between the vibration element and the outer supporting frame, an inner frame connected to the vibration element, an outer holding frame, and a second suspension edge member connected between the inner frame and the outer holding frame. The dual suspension edge member structure of the radiation device for making the dual suspension edge loudspeaker or loudspeaker box prevents shaking and shifting of the vibration element to improve the sound effect quality.

Abstract: A magnetic circuit assembly may be used in a loudspeaker. The magnetic circuit may include a magnet that has a central axis. The magnet can have a first surface and a second surface that is opposite the first surface. The magnet may produce magnetic field axially through the first and second surfaces of the magnet. The second surface of the magnet may have an inner radial region and an outer radial region. The magnetic circuit assembly can further include a yoke that is disposed adjacent the first surface of the magnet. The yoke can be shaped to form a first gap radially between the yoke and the magnet. The magnetic circuit assembly may further include first and second plates disposed adjacent the second surface of the magnet.

Abstract: A diaphragm, including: a metal dome, a non-metallic diaphragm portion, and a flexible rim. The non-metallic diaphragm portion is bonded to a metal dome outer periphery, and a non-metallic diaphragm portion outer periphery extends corresponding to a convex direction of the metal dome and expands radially away from the metal dome. The flexible rim is bonded to the non-metallic diaphragm portion outer periphery. The diaphragm of the present application adopts the combination of the metal dome, the non-metallic diaphragm portion, and the flexible rim, the overall rigidity of the diaphragm is enhanced, and the internal damping property of the diaphragm and the compliance of the vibration of the diaphragm can be adjusted, which can effectively reduce segmentation vibration of the diaphragm during high-frequency vibration and reduce the segmentation distortion of the diaphragm at high frequencies, thereby extending the bandwidth of the diaphragm.

Abstract: A speaker includes a center pole, a voice coil, a diaphragm, and a turbulent flow generator. A center pole includes a through hole formed in the center pole in an axial direction. The voice coil is disposed around the center pole. A diaphragm includes a center cap that is disposed to face an opening of the through hole. A turbulent flow generator is disposed inside the through hole. The turbulent flow generator generates a turbulent flow inside the through hole.

Abstract: Speakers for locating in a vehicle exhaust system having a speaker surround that is formed from a rubber compounded using a polyacrylate polymer. Speakers having a speaker surround that is integral with a coating that covers or substantially covers at least one surface of the diaphragm.

Abstract: An opening portion is formed along an outer peripheral edge of a diaphragm in a second casing portion partitioned by the diaphragm. In the opening portion, a plurality of fins is arranged at regular intervals, and an air passage is formed between every adjacent two of the fins. The fin and the air passage are formed so as to be at an angle to a corresponding imaginary line that extends from the vibration center line of the diaphragm in the radial direction. By forming each of the air passages obliquely, noise generated by an air flow due to sound pressure is reduced.

Abstract: A device for ultrasound tests, includes one or more transducers for generating ultrasound beams with different powers/frequencies to be projected in direction of multiple targets, to ensure separate control of the temperature both of the targets and of the transducers and allows performing several tests contemporarily, by optimizing the functionality and the efficiency of the device, and guaranteeing results comparable therebetween for each test.

Abstract: The present invention provides a digital to analog conversion method and system that uses piezoelectric effect and magnetic induction to reconstruct the infinite analog values between discrete digital samples. This magnetic-piezoelectric armature delivers an output analog signal of a smooth continuous nature that provides a more faithful representation of the original analog signal. The method and system use mechanical movement, which is continuous by nature since there is no quantization in the different positions a moving object can assume between two spacial points, to construct the signal approximation between digital samples. The magnetic-piezoelectric armature uses a highly sensitive piezoelectric material that moves a magnet in the proximity of a wire coil to induce a voltage signal reproducing the original analog signal. The piezoelectric material expands and contracts following the changes in voltage between digital samples which induces a corresponding continuous analog voltage signal in the coil.

Abstract: A speaker apparatus capable of operating in a large amplitude regime by minimizing magnetic loss, is provided. The speaker device includes a magnet configured to generate a magnetic flux, a pole piece configured to form a path of the magnetic flux generated by the magnet, a back plate provided at a lower end of the pole piece to support the magnet, and a plate provided to form a magnetic gap between the plate and the pole piece. Several plates may be provided so that the magnetic gap is expanded to enlarge amplitude of output sound.

Abstract: An apparatus includes a voice coil bobbin for an electroacoustic driver. The bobbin has a plurality of cutouts for venting an interior of the bobbin. The bobbin includes a plurality of integral flanges at the end of the bobbin which can be used to secure a diaphragm to the end of the bobbin. Each of the flanges extends from the bobbin at an angle that is no more than about thirty nine degrees relative to a plane that is substantially perpendicular to an intended direction of travel of the bobbin during operation of the driver. An electrically conductive voice coil is wound around the bobbin.

Abstract: A speaker is disclosed. The speaker includes a housing with an accommodation space; a speaker unit accommodated in the housing; a back cavity formed between the speaker unit and the housing; and at least a first leak formed on the housing communicating with the back cavity. One end of the leak is connected to the back cavity, and the other end is connected to the outside of the speaker.

Abstract: A drive apparatus and heat dissipating apparatus for a vibrating diaphragm coil of a speaker, a mobile terminal and heat dissipating method, the heat dissipating apparatus includes: a control unit configured to output an enabling signal to trigger an audible sound drive circuit to work when judging the speaker is in a sounding state, and output an enabling signal to trigger an non-audible sound drive circuit to work if the speaker is in a non-sounding state; the audible sound drive circuit configured to, after being enabled by the control unit, amplify a received audio signal, then drive the vibrating diaphragm coil of the speaker to vibrate; and the non-audible sound drive circuit configured to, after being enabled by the control unit, drive the vibrating diaphragm coil of the speaker to vibrate and control the vibration frequency of the vibrating diaphragm coil to be human ear non-audible ultrasonic or infrasonic frequency.

Abstract: An electrodynamic transducer includes a motor assembly and a diaphragm disposed forward of the motor assembly, the diaphragm having a front surface and a rear surface. A back cover supports the motor assembly and the diaphragm, the back cover creating an air cavity beneath the diaphragm rear surface. The back cover includes at least one heat-conducting member providing a heat transfer path from the motor assembly to the back cover.

Abstract: A multi-driver transducer having symmetrical magnetic circuits and symmetrical coil circuits, wherein one or more pieces of circular or annular partitions made of a non-magnetic material are used to bond two or more sets of dual magnetic gap and dual coil driver units (01 or 02) into one integrated magnetic core.

Abstract: A speaker frame, including: a vibration support portion supporting a vibrating body of a speaker; a magnet support portion arranged inside of said vibration support portion and supporting magnetic circuit portion of said speaker; and a plurality of connection beams connecting said vibration support portion and said magnet support portion, wherein the vibration support portion and the magnet support portion have a circular ring shape having the same major axis length and minor axis length, said plurality of connection beams are arranged radially centering on a central axis from said magnet support portion to said vibration support portion, the central axis being parallel to a direction of an acoustic radiation, and a length of one of said connection beams and a length of another connection beams are different from each other.

Abstract: A speaker box includes a case includes an upper side and a lower side opposite to the upper side, an electroacoustic transducer received in the case and including a first pole plate with a plurality of first gaps for communicating with the magnetic gap, a second pole plate attached on a lower surface of the first pole plate. The second pole plate defines a second main member, a plurality of second auxiliary members extending from a periphery of the first main member, and a plurality of second gaps corresponding to the first gaps. Each of the second auxiliary members defines a longer auxiliary member and a shorter auxiliary member respectively.

Abstract: A receiver, the receiver includes a coil, a top assembly, a bottom assembly, and a flat planar armature. The flat planar armature includes an outer ring-like portion that forms a first opening. The flat planar armature further includes a central portion that extends from the outer ring-like portion into the opening. An end of the central portion is free to move in the presence of magnetic flux. The flat planar armature has a first end portion and a second end portion. The first end portion couples to the top assembly and the bottom assembly. The top assembly and the bottom assembly form a second opening that exposes the second end portion.

Abstract: An electromagnetic vibration device includes a vibration plate device, a voice coil assembly, a magnetic loop system, and a peripheral basin frame. One end of the peripheral basin frame is coupled to the vibration plate device, and the other end thereof is coupled to the magnetic lop system. The peripheral basin frame includes a plurality of connecting frames, wherein every two connecting frames are connected by a connecting member to form an integral peripheral basin frame. The size of the peripheral basin frame is adjusted by the distance between the connection frames or relative increase of the number of the connection frames, so that the size of the peripheral basin frame is adjustable to match with the vibration plate device of the electromagnetic vibration device. Only a mold is required to manufacture the connecting frame to form the peripheral basin frame for different sizes of electromagnetic vibration device.

Abstract: An inner magnet type microspeaker including a suspension is provided which can maximize the size of a magnet. The inner magnet type microspeaker includes: a frame; a yoke installed inside of the frame and including a bottom surface and sidewalls bent upward from the bottom surface; a magnet bonded to an inside of the yoke; a voice coil located in a gap portion between the sidewalls of the yoke and the magnet; a diaphragm that vibrates by the voice coil; and a suspension where the voice coil is attached, and which guides vibrations of the diaphragm and the voice coil and includes a ring-shaped inner peripheral portion and an outer peripheral portion that surrounds the inner peripheral portion, spaced a predetermined distance apart from the inner peripheral portion, with one end and the other end being connected to the inner peripheral portion.

Abstract: A dynamic microphone unit includes a diaphragm vibrating upon receiving acoustic waves, a voice coil fixed to the diaphragm, vibrating together with the diaphragm, a magnetic circuit generating a magnetic field in a magnetic gap in which the voice coil is disposed, a rear air chamber formed behind the magnetic circuit, wherein holes for connecting a back side space of the diaphragm with the rear air chamber are formed in a member forming the magnetic circuit in order to reduce resonance and reduce peaks developing in frequency response characteristics, achieving uniformity of directivity.

Abstract: A portable audio device, which includes active noise cancellation circuitry, a hearing aid compliant magnetic radiator, and a speaker/earpiece, is surrounded by ambient acoustic noise. The active noise cancellation circuitry provides an anti-noise signal at an input of the speaker to control/reduce the ambient acoustic noise outside of the device. In addition, the active noise cancellation circuitry provides an inverse anti-noise signal to an input of the magnetic radiator. The magnetic fields produced by the speaker driven by the anti-noise signal and the magnetic radiator driven by the inverse anti-noise signal cancel each other out through phase cancellation such that a hearing aid using a telecoil coupled to the audio device does not produce significant audio waves based on either of these signals. Other embodiments are also described.

Abstract: A speaker apparatus includes: a diaphragm vibrating to output sounds and being formed in an annular shape having a center hole in the middle thereof; a driving section causing the diaphragm to vibrate; a light emitting member emitting light; and a heat controlling member radiating heat generated when the light emitting member emits light or conducting the heat to a heat radiating section, wherein at least a part of the heat controlling member is provided on an axis including the center axis of the diaphragm, and the light emitting member is disposed on an end face of the heat controlling member.

Abstract: A vibration system is disclosed. The vibration system includes a diaphragm and a voice coil that drives the diaphragm to vibrate. The diaphragm includes a fixing part for fixing the voice coil, and a heat sink is disposed on and fixed to the fixing part. A speaker using the vibration system is also disclosed. By disposing the heat sink on the diaphragm, heat can be dissipated from the voice coil effectively to ensure stability of the speaker.

Abstract: A vibration system is disclosed. The vibration system includes a diaphragm and a voice coil that drives the diaphragm to vibrate. The diaphragm includes a fixing part for fixing the voice coil, and a heat sink is disposed on and fixed to the fixing part. A speaker using the vibration system is also disclosed. By disposing the heat sink on the diaphragm, heat can be dissipated from the voice coil effectively to ensure stability of the speaker.

Abstract: A heat dissipation device for a moving-coil loudspeaker, comprising: a thermally conductive pad, a thermally conductive bar, and a heat sink, the thermally conductive pad, the thermally conductive bar and the heat sink being integrally mounted at an axially central portion of the loudspeaker; the thermally conductive bar is axially connected to the thermally conductive pad and the heat sink at top and bottom thereof respectively, the thermally conductive bar is axially provided with a through hole or a groove at a circle center thereof, the heat sink is axially provided with a through hole in which a screw is tapped, a central groove at a top end of the thermally conductive bar is aligned with a groove on the thermally conductive pad to form a straight line groove such that a communication passage leading to an exterior of the loudspeaker is for the electronic components on a circuit board.

Abstract: There is provided a loudspeaker apparatus which has a diaphragm and a magnet system for driving the diaphragm. The loudspeaker apparatus also has a light source and a cooling device (K) having at least one cooling unit for cooling the at least one light source. The light source is thermally coupled to the first cooling unit. The first cooling unit with the at least one light source is arranged in front of the diaphragm. The outside of the diaphragm can have light reflecting properties.

Abstract: A speaker assembly includes a speaker housing having a substantially closed speaker chamber, the speaker housing including a first wall with a dimple assembly defining a heat sink formed therein. A first driver is mounted and enclosed in the speaker chamber, the first driver including a cone coupled to a driver magnet for generating sound. The driver magnet is in direct contact with the dimple assembly effectively exposing the driver magnet to an exterior of the speaker housing via the heat sink defined by the dimple assembly.

Abstract: A method for making a diaphragm is provided. The method includes providing a first ring (305) having a first diameter and a second ring (307) having a second diameter which is greater than said first diameter, wherein at least one of said first and second rings comprises a first elastomeric material; and overmolding the first and second rings with a second material (303) which is distinct from said first material, thereby forming a diaphragm (301).

Abstract: Systems and methods to remove heat from an acoustic enclosure are provided. An apparatus for reproducing acoustic signals includes an acoustic enclosure comprising an acoustic volume. A heat producing element is coupled to the acoustic enclosure, and a thermally conductive structure is thermally coupled to the heat producing element. The thermally conductive structure includes a first surface. A first passive radiator includes a first diaphragm. The first diaphragm extends over at least a portion of the first surface and moves in response to pressure variations within the acoustic volume. Movement of the first diaphragm causes air to flow over the first surface, to facilitate heat removal from the thermally conductive structure.

Abstract: A low frequency transducer arrangement includes a substantially cylindrical structure surrounding a pole piece. The pole piece and the substantially cylindrical structure define a substantially cylindrical air gap therebetween. Two opposite ends of the air gap are both open and separated from each other in an axial direction. A first magnet is disposed in either the pole piece or the substantially cylindrical structure. A second magnet is separated in the axial direction from the first magnet by a middle magnetic gap. The second magnet is disposed in either the pole piece or the substantially cylindrical structure. The first and second magnets provide flux in a same direction in the middle magnetic gap. A top magnetic gap is disposed axially adjacent the first magnet and opposite the middle magnetic gap. A bottom magnetic gap is disposed axially adjacent the second magnet and opposite the middle magnetic gap. A voice coil is at least partially disposed in the air gap and operates in the middle magnetic gap.

Abstract: A system is provided to protect a loudspeaker (144) by controlling a level of an applied audio signal. A control signal is generated by applying an input audio signal (115) to the collective operations of a gain control system (100). The gain control system (100) uses the input audio signal (115) in conjunction with at least one parameter to derive an estimated stress associated with the loudspeaker (144). The estimated stress is compared with a protection threshold stress (127). If the protection threshold stress is exceeded, a gain applied by a gain component (134) is selectively adjusted to modify the input audio signal (115). The resulting gain-controlled audio signal (116) is employed to drive the loudspeaker (144).

Abstract: The inertial transducer comprises a foot, a modular key, at least one suspension means having at least three contact points, and heat dissipation means comprising multiple heat transfer points. The foot alternatively includes an opening or a cap. The cap may be frangible. Preferably, the foot includes a cylindrical wall that extends within the inertial transducer and the foot's lower surface is coplaner with the lower surface of a housing of the transducer, thereby reducing stack height. The cylindrical wall may or may not be threaded and may accept a shaft from a receiving apparatus used to associate the transducer with a substrate.

Abstract: This invention relates to the mechanical protection using digital processing and a predictive estimation of instantaneous displacement of the voice coil in a loudspeaker transducer. The invention solves the problem of limiting the coil displacement of the transducer by applying a look-a-head based linear or non-linear predictor and a controller operating directly on the displacement signal in order to finally convert back into the incoming signal domain.

Abstract: In one embodiment, a mobile device including a magnet unit that is thermally coupled to the heat sink portion of a housing of the mobile device is disclosed. The mobile device comprises a speaker driver that includes a magnet unit, a housing having a heat sink portion that is made of a material having a high thermal conductivity, and a thermal component. The heat sink portion has a first face that is coupled to the speaker driver and a second face that is exposed to the exterior of the mobile device. The thermal component binds the speaker driver to the first face of the heat sink portion to create a cooling path from the magnet unit to the exterior of the mobile device. Other embodiments are also described.

Abstract: There is provided a loudspeaker apparatus which has a diaphragm and a magnet system for driving the diaphragm. The loudspeaker apparatus also has a light source and a cooling device (K) having at least one cooling unit for cooling the at least one light source. The light source is thermally coupled to the first cooling unit. The first cooling unit with the at least one light source is arranged in front of the diaphragm. The outside of the diaphragm can have light reflecting properties.

Abstract: A low frequency transducer arrangement includes at least one substantially annular magnet. A voice coil is disposed within and concentric with the magnet. A pole is disposed within and concentric with the voice coil. An air gap is defined between the magnet and the pole. The pole includes a bottom half having a downwardly facing axial recess. A plurality of first air passages extend laterally from the axial recess and fluidly interconnect the recess and the air gap. A top half has an upwardly facing axial recess. A plurality of second air passages extend laterally from the upwardly facing axial recess and fluidly interconnect the upwardly facing recess and the air gap. The first air passages and/or the second air passages are non-radially oriented.

Abstract: A speaker includes a magnetic circuit, a voice coil, and a diaphragm which are disposed in a case. The case is placed in an engine compartment of an automobile. Reproduced sound is emitted through a duct protruding outward from the case. A partition wall, which is a metal body frame of the automobile, is present between the engine compartment and the cabin space. The duct is inserted into a hole formed in the partition wall so that a sound port faces and protrudes into the cabin space. A heat dissipation port is formed in the case, and an end surface the magnetic circuit facing the partition wall is exposed in the heat dissipation port. An elastically deformable thermal conductive sheet is sandwiched between the partition wall and the end surface of the magnetic circuit.

Abstract: A speaker device, wherein vibration of a magnetic circuit section is suppressed with a magnetic influence on the magnetic circuit section suppressed. A speaker device having a vibration section and generating an audio sound by vibration of the vibration section is provided with a magnetic circuit section for forming a magnetic field for vibrating the vibration section and also with a weight section fixed to the magnetic circuit section and suppressing vibration of the magnetic circuit section subjected to reaction force caused by vibration of the vibration section. The weight section is fixed to the magnetic circuit section through a joint section for joining the magnetic circuit section and the weight section to each other, and this forms between the magnetic circuit section and the weight section a predetermined space for magnetically separating the magnetic circuit section and the weight section from each other.