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: In the speaker device, a casing and a magnetic circuit are arranged to confront each other, and a vibration body is arranged between them. The outer circumferential part of the vibration body is supported by the casing. A supporting member passes through the inside of the vibrating body and extends from the casing to the magnetic circuit. Since the supporting member for supporting the magnetic circuit passes the inside of the vibration body, it is not necessary to provide a member such as a frame for supporting the magnetic circuit from outside of the vibration body. Therefore, there is no obstacle such as a frame in a propagating direction of the sound wave generated by the vibration body, and hence the non-directivity can be ensured.

Abstract: A speaker having improved sound quality by reducing a phase difference and also having an outstanding outward appearance is provided. In a speaker comprising a vibrating element 10, a drive unit 20 for vibrating the vibrating element 10, and a frame 30 supporting the vibrating element 10 and the drive unit 20, the vibrating element 10 comprises a front face region 10A which forms a continuously curved face having a convex-shaped cross-sectional portion T1 formed in its central portion and a concave-shaped cross-sectional portion T2 formed around the portion T1, and a connecting region 10B located on the rear side of the front face region 10A and connected to the drive unit 20.

Abstract: A speaker includes a magnetic circuit forming a slit-like magnetic gap, a frame that houses and holds the magnetic circuit, a diaphragm attached to the frame so as to be capable of vibrating, a voice coil unit that is placed so as to pass through substantially the center of the magnetic gap, and has its one end coupled to the diaphragm, and a damper attached to the frame to support the other end of the voice coil unit. The voice coil unit has a planar-type coil bobbin section, and a voice coil section having a coil member wound in a planar track shape and disposed so as to extend through the coil bobbin section from one side to the other side and from the other side to the one side.

Abstract: In a speaker device, each inner peripheral edge portion of a conductive damper and an ordinary damper is fixed to an area in the vicinity of a lower end of a cylindrical portion of a connecting member, and each outer peripheral edge portion of them is fixed to a support member. The conductive and ordinary dampers are attached to an area within a constant winding width of a voice coil. When the speaker device is driven, the voice coil bobbin vibrates in an axial direction of the speaker device. The voice coil bobbin sometimes rolls due to various factors. Since a fulcrum of the rolling is within the winding width, a distance r2 from the fulcrum P11 to an intersection of a central axis of the speaker device and a plane surface including a center in the winding width becomes short, and the bobbin hardly rolls.

Abstract: The loudspeaker includes a dome diaphragm that is made of a base material impregnated in a thermosetting resin; a cone diaphragm whose outer circumference side end portion is coupled with an outer circumference end portion of the dome diaphragm; and a voice coil having a bobbin whose one end is coupled to a back surface of the dome diaphragm, and whose outer curved surface is coupled with an inner circumference end portion of the cone diaphragm, wherein the dome diaphragm is provided with a plurality of cone-shaped projections that is formed by hardening the thermosetting resin, projecting from the back surface, and disposed in a circular pattern with a space between each other, the plurality of cone-shaped projections defining a coupling portion to which the one end of the bobbin is coupled.

Abstract: To provide a speaker unit capable of being thinned much further. A speaker unit 1 includes a voice coil 6 through which an input signal is passed, a voice coil bobbin 5 for converting the input signal flowing through the voice coil 6 into a mechanical reciprocating movement, a diaphragm 2 connected to either one side of said voice coil bobbin 5 in the reciprocating vibration direction; and a damper not connected to the voice coil bobbin 5 and connected to an outer edge portion of the diaphragm 2 and suppressing a rolling phenomenon of the voice coil bobbin 5.

Abstract: An audio speaker is implemented as a front or rear mounting type speaker. In one embodiment, the front mounting type speaker includes a U yoke; a frame mounted on the top periphery of the U yoke; a magnet secured onto the bottom of the U yoke; a pole piece mounted on the magnet; a voice coil mounted around the pole piece and spaced therefrom, the voice coil having a coil section and a non-coil section; a damper interconnecting an inner, intermediate stage of the frame and the non-coil section, an inner support mounted on an inner, upper stage of the frame; a diaphragm having an inner edge secured to the non-coil section above the damper; and a surrounding suspension member interconnecting the inner support and an outer edge of the diaphragm. The damper has a width equal to or greater than that of the suspension member in either type.

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: In a speaker device, when an excessive driving signal larger than a withstand input is inputted to a voice coil, a voice coil bobbin moves with large magnitude. When the voice coil bobbin largely moves on a side opposite to a sound emitting side (downward), each component of the speaker device collides with each other and a large abnormal sound occurs. Therefore, a connecting member and a pot type yoke are designed to collide with each other via a buffer member in an area E1, for example, when the voice coil moves downward with the large magnitude. Namely, the buffer member is attached on a bottom surface of a bent portion of the connecting member, opposite to an upper surface of a cylindrical portion of the pot type yoke, in a circumferential direction.

Abstract: A magnetic circuit part of a loudspeaker is formed of a plate, a magnet, and a yoke. A step is disposed in the plate that comes into contact with a disc-like magnet and forms a magnetic gap. A loudspeaker is provided where the step moves a voice coil away from the leakage magnetic field of the yoke, the influence of the leakage magnetic field is eliminated even when the output is large, the distortion is small, and the sound quality is high.

Abstract: The present invention relates to a microspeaker with a damper in a magnetic circuit. The microspeaker includes a support, a magnetic circuit in the support, a diaphragm suspended on the support, and a voice coil and a damper connected with the diaphragm. The magnetic circuit is provided at the center with a through hole where the damper is positioned, and the voice coil is positioned in a magnetic gap formed by the magnetic circuit. The microspeaker of the present invention with the damper in the magnetic circuit can not only equally control resonance but also be produced in a simpler way compared to adding damping materials to the support.

Abstract: A speaker apparatus has a container holding a volume of ferrofluid, a permanent magnet suspended in the ferrofluid, and a magnetic excitation apparatus proximate the container. Operation of the excitation apparatus causes movement of the permanent magnet, translated through the ferrofluid to walls of the container, which walls act as resonators creating sound waves in surrounding medium. Audio production is accomplished placing a ferrofluid and a permanent magnet in a container, placing an excitation apparatus in proximity of the permanent magnet, and driving the excitation apparatus to cause movement of the permanent magnet translated through the ferrofluid to walls of the container, which walls act as resonators creating sound waves in surrounding medium.

Abstract: Systems, methods, and devices for improving speaker performance with an acoustic damped port are disclosed. In accordance with various embodiments of the present invention, a damping material is placed around a vented frame of a speaker driver, and substantially covers or fills the vents of the frame. In some embodiments, the damping material results in improved impedance matching with acoustic delay, without required dimensional tuning (as with conventional ports). In some embodiments, it also reduces the air velocity gradients minimizing higher order frequency distortion components. In some embodiments, the damping material also acts as an absorber of energy by coupling to the sound wave. In some embodiments, low-frequency performance is improved in a small-scale design.

Abstract: The present invention relates to a damper of a rectangular-shaped slim speaker that is capable of preventing a vibration plate having an entire outer appearance of a slim oval/track-like shape extended to any one side thereof from being moved in forward and backward directions. The damper of a rectangular-shaped slim speaker includes: fixed end portions formed on either end thereof, respectively, to face each other in a vertical direction; support plate portions each extended backwardly from the fixed end portions; and an elastic portion extended backwardly from the support plate portions, wherein the fixed end portions, the support plate portions, and the elastic portion are formed integrally as an injection molded plastic product.

Abstract: A loudspeaker of the present invention includes a diaphragm; a voice coil for driving the diaphragm; and a magnetic circuit including a yoke, a magnet provided on the yoke, and an upper plate provided on the magnet, for producing a magnet field that is perpendicular to the voice coil. The upper plate has a surface configuration such that when reflecting sound waves created by the diaphragm, the upper plate diffuses the sound waves.

Abstract: A weight is attached to the rear side of a magnetic circuit of a speaker unit. The tip of a boss that projects from the front side of the weight is joined to the rear side of a center pole of the magnetic circuit with a bolt. Even if reactive force that is generated when an electrical signal is converted into mechanical vibration by the magnetic circuit and a voice coil and sound waves are emitted from a vibration plate is transmitted to the magnetic circuit, the vibration of the magnetic circuit is suppressed by the weight. In this manner, sound quality with a good transient characteristic can be obtained.

Abstract: A weight is attached to the rear side of a magnetic circuit of a speaker unit. The tip of a boss that projects to the front side from the weight is joined to the rear side of a center pole of the magnetic circuit with a bolt. Even if reactive force that is generated when an electrical signal is converted into mechanical vibration by the magnetic circuit and a voice coil and sound waves are emitted from a vibration plate is transmitted to the magnetic circuit, the vibration of the magnetic circuit is suppressed by the weight. In this manner, sound quality with a good transient characteristic can be obtained.

Abstract: An anti-resonant structure for speakers includes a resonant structure which has a housing compartment, at least one elastic element located in the housing compartment that has one end fastening to the resonant structure and another end coupling with a speaker, and at least one buffer element located between the resonant structure and the elastic element to serve as a buffer interface to prevent the speaker from hitting due to elastic element and the resonant structure. The speaker is the element that generates vibration. The elastic element has an elastic section to absorb the vibration energy generated by the speaker to prevent the resonant structure from generating unwanted resonance and noises, and prevent electronic elements from being damaged by the resonant effect.

Abstract: The present invention relates a speaker having a diaphragm around the rim of a frame on the speaker for disposing a magnetic member at the center of the diaphragm along the direction of a resonant space enclosed by the diaphragm and the frame. When a winding in the center of the frame is excited, the resonant space generates varying magnetic lines and an attraction-repulsion effect is generated in the center of the winding or a reserved space at the position of the periphery to vertically slide the magnetic member and cause the diaphragm to vibrate and generate sound. The present invention can effectively reduce the space occupied by the components such as the seat, core, and magnetic member, and greatly reduce the thickness of the speaker.

Abstract: A speaker arrangement in which a diaphragm does not displace in directions other than a regular oscillating direction. The speaker arrangement includes a magnetic circuit having a magnetic gap, a voice coil located in the magnetic gap, a voice coil bobbin having the voice coil wound thereon, a diaphragm mounted on the voice coil bobbin, a hollow portion extending in a longitudinal direction of the voice coil bobbin and defined inside that portion of the magnetic circuit which is surrounded by the voice coil, an elongated rod inserted in the hollow portion of the magnetic circuit and fixed to the diaphragm, and at least one support member located at a predetermined position in the hollow portion of the magnetic circuit for movably supporting the elongated rod in the magnetic circuit hollow portion.

Abstract: A panel transducer includes a diaphragm with areas of multiple electrical conductors, two rows of magnetic bars, two metal plates and a clamping frame. The diaphragm is clamped in the clamping frame and is positioned between the two rows of magnetic bars. Each row of magnetic plates is in close proximity to the clamped diaphragm. Each metal plate has holes. The holes correspond to spacing areas between the magnetic bars and acoustically connect the diaphragm to outside media. The magnetic bars are sequentially located on the metal plates with spacing between the magnetic bars. The diaphragm is secured to the clamping frame and has an active surface area under tension spaced inwardly of the clamping frame. There are no side magnetic bars at the ends of each of the row. Absorbing strips are used in place of the absent magnetic bars filling the space between the side magnetic bars and the clamping frame.

Abstract: In a speaker device 10 having: a magnetic circuit 13 including a magnet 14 and a yoke 11; a voice coil 16 which is placed in a magnetic gap 12 of the magnetic circuit 13; and a diaphragm 17 which is vibrating available in a state where the diaphragm is coupled with the voice coil 16, a peripheral edge of the diaphragm 17 being fixed to a housing 20, a damper holder 30 is disposed in a portion where a damper 27 is attached to the housing 20. The damper holder 30 is in point contact with the housing 20 via three or more projections 31 which are disposed on one of the damper holder 30 and the housing 20. Preferably, the damper holder 30 is made of a hybrid material of a resin (polypropylene) and tungsten, and has a specific gravity of 10.0 or larger.

Abstract: A loudspeaker with independent magnetic dampening and excursion control includes at least two magnets for dampening the axial movement of a voice coil. The dampening magnets substantially reduce/prevent fatigue of the component parts of the loudspeaker and detrimental contact between the voice coil and its supporting parts and the remaining component parts of the loudspeaker. A pole yoke supported by a backplate defines the inner diameter of an annular gap within which the voice coil moves and a top plate defines the outer diameter of the gap. A first dampening magnet is statically supported by the pole yoke. A second dampening magnet is supported by and moves in concert with the voice coil. As the voice coil and second magnet move within the gap, the repelling forces of the magnets provide the desired dampening effect, thus limiting or reducing the movement in one direction.

Abstract: An electromagnetic transducer, such as an audio speaker, includes a return path member which is a pole piece for external magnet geometries or a cup for internal magnet geometries. The magnetic flux return path for the primary drive magnet is through a first portion of the return path member. A first section of a low reluctance magnetic flux return path for a secondary drive magnet is through a second portion of the return path member. A magnetically conductive plate provides a second section of the low reluctance return path from the second portion of the return path member to the secondary drive magnet.

Abstract: The present invention provides a loudspeaker having double symmetric magnet-circuits, double voice coils and double dampers. The loudspeaker comprises a diaphragm holder, a diaphragm, an upper and a lower dampers, an annular steel magnet, a core, voice coils, an upper and a lower plate. Wherein the core is a steel magnet, the polarities of its upper and lower ends being opposite to those of the upper and lower ends of the annular steel magnet, so are two symmetric and parallel magnet-circuits formed. Thus the intensity of the magnet field in the two magnet gaps became very high because of the two magnet sources, so is the high power loudspeaker able to work normally.

Abstract: A receiver for converting electrical energy to acoustical energy, and a method of manufacturing the receiver, are disclosed. The receiver comprises an armature having a peripheral edge, a magnet stack and a weld joint for attaching the armature to the magnet stack at the peripheral edge of said armature. The method comprises providing an armature having a peripheral edge, providing a magnet stack adjacent said armature, and welding said armature to the magnet stack at the peripheral edge of said armature.

Abstract: Loudspeaker and other transducers of the dual-voice-coil/dual-magnetic-gap type can be improved by the addition of one or more annular shorting rings strategically located in the vicinity of the two magnetic gaps. The shorting rings have no effect on a steady state magnetic field but act in opposition to any change in flux density or any displacement of the flux lines such as those that occur under the loading imposed when the voice coils are driven hard with audio frequency current. The location of the shorting rings determines their effect: location close to a voice coil reduces the voice coil inductance, location entirely within the magnetic flux loop centerline favors reduction of second harmonic distortion and higher order even harmonic distortion, a centered location on the flux loop centerline, i.e.

Abstract: A magnetic circuit includes an annular magnet magnetized in the axial direction thereof; an annular stacked plate disposed on the magnet and including first and second annular plates; and a yoke facing the inner circumferential surface of the stacked plate across a cylindrical space. Upper and lower magnetic gaps are provided at two axially separated positions in the cylindrical space. A loudspeaker includes the magnetic circuit; a voice coil placed in the upper and lower magnetic gaps; a diaphragm connected to the voice coil; and a frame fixed to the stacked plate and supporting the diaphragm in a vibratable manner. The inner circumferential portions of the first and second annular plates are axially deformed downward and upward, respectively, such that the inner circumferential surface of the stacked plate faces the lower and upper magnetic gaps. The remaining portions of the first and second annular plates are stacked on the magnet.

Abstract: Negative stiffness is generated for a vibration system of a speaker unit by using a movable magnet attached to the vibration system of the speaker unit and also a ring-like stationary magnet arranged coaxially at the outer radius thereof in order to increase equivalently internal volume of a cabinet. In addition, an offset in the displacement direction of the vibration system of the speaker unit is detected with a Hall element and fed back to a power amplifier in order to correct the offset in the displacement direction of the vibration system of the speaker unit. As a result, a reliable and practical bass reproduction speaker apparatus can be obtained, and the speaker apparatus is noise-free and excellent in bass reproduction performance even with a cabinet of small capacity.

Abstract: A multi-functional vibration actuator comprises a vibration transmitting portion (8) forming a peripheral portion thereof, a magnetic circuit formed by a yoke (1), a permanent magnet (2), and a plate (3), a vibrator member (5) arranged at a distance from one surface of the magnetic circuit and having an outer periphery fixed to the vibration transmitting portion, a coil (6) arranged in a gap within the magnetic circuit at a distance from the magnetic circuit and fixedly attached to the vibrator member, and a suspension (4) fixed to the vibration transmitting portion and flexibly supporting the magnetic circuit. The distance (b) between the vibrator member and each of the one surface of the magnetic circuit and the suspension is greater than the distance (a) between the other surface of the magnetic circuit and a bottom cover (9) covering the magnetic circuit.

Abstract: A butterfly damper for supporting a voice coil bobbin of a speaker on a frame in a state that the damper is vibrative. The butterfly damper is made of olefinic resin material having an internal loss of 0.045 or greater, a tensile elongation of 200% or greater, and a flexural modulus of 300 MPa or greater.

Abstract: A loudspeaker having a back plate, a driver attached to the back plate, the driver being responsive to an electrical signal, an enhancer having a neck and a mouth, the neck attached to the driver and movable in accordance with the movement of the driver, a thin film membrane, the membrane attached to the enhancer, the membrane stretched over the frame, a frame for supporting the membrane and maintaining it in a taut state, and a rubber type adhesive for dampening the membrane resonances and for adhering the membrane to the frame. Clarity of sound can be further improved by including a plurality of sound breathers in the back plate of the speaker. For improved sound radiation capability, the size and the shape of the enhancer can be modified in various ways, including a frustoconical, parabolic, or bell-shaped enhancer.

Abstract: A speaker includes: a frame; a magnetic circuit fixed to the frame; a diaphragm fixed to the frame so as to be capable of vibrating in a predetermined direction; a driving force transmitting member connected to the diaphragm; and a damper for supporting the driving force transmitting member, wherein the magnetic circuit is positioned between a first plane and a second plane, the first plane being parallel to the diaphragm and defined as a plane with which at least a portion of the magnetic circuit is in contact, and the second plane being parallel to the diaphragm and defined as a plane with which at least a portion of the magnetic circuit is in contact, and one end of the damper is connected at a position between the first and second planes, and the other end of the damper is connected at another position between the first and second planes.

Abstract: Disclosed is a vibration speaker capable of transferring a stable vibratory force to a set including the vibration speaker for eliminating a touch sound of a vibrating mass and generating a minimum vibrating force during vibration by expanding inputted frequency bandwidth.

Abstract: An electromagnetic sound producing device has a yoke, a coil, a permanent magnet, and a diaphragm provided in a case. The permanent magnet is made of SmFeN-base isotropy plastic magnetic material.

Abstract: A plane driving type electroacoustic transducer having a film of diaphragm with a conduction pattern formed thereon and a magnetic circuit, wherein a vibration damping layer is provided on the diaphragm.

Abstract: A device including two bodies (3, 5) which are disposed coaxially with respect to a translation axis (1), and including a comparatively compact suspension via which at least one of the bodies is movable with respect to the other body along the translation axis. The suspension, which allows comparatively large and accurately defined axial excursions of the one body with respect to the other body, includes a set of at least three blade spring elements (7) which are positioned around the translation axis. These blade spring elements each include two blade springs (7a, 7b) which are inclined with respect to a plane (XY) oriented perpendicularly to the translation axis, the blade springs of each blade spring element each having two peripheral portions (7a1, 7a2; 7b1, 7b2) which each extend parallel to the plane which is oriented perpendicularly to the translation axis.

Abstract: An inertial vibration transducer (9) characterised by a motor coil assembly comprising a tubular member (18) and a coil (13) rigidly fixed to the tubular member, and by a magnet assembly (15) disposed concentrically within the motor coil, and resilient means (19) supporting the magnet assembly for axial movement relative to the motor coil, the motor coil and tubular member being adapted to be rigidly mounted to a distributed mode radiator (2).

Abstract: The present invention relates to a hearing aid receiver (10) having a coil (12) with a tunnel (14) therethrough, a magnetic structure (16) having a central magnetic gap (18), an armature (20), and a fluid (30, 32) with a viscosity greater than air to provide shock protection to the receiver (10). The tunnel (14) and the magnetic gap (18) collectively form an armature aperture (28). The armature (20) extends through the armature aperture (28). The fluid (30, 32) lies within the armature aperture (28).

Abstract: The invention provides an electroacoustic transducer wherein the resonant chamber is given a space and volume necessary for resonance and the vibration system is given an efficient air damping effect and thereby undesired vibrations are suppressed with the resonant effect maintained. The electroacoustic transducer according to the invention is provided with a resonant chamber for resonating with the vibration of a diaphragm and a sound ejecting hole for communicating the resonant chamber with the outside air formed on a position off to the central axis of the diaphragm. Furthermore, an air damping means for compensating the lowering of the air damping effect due to the dislocation of the sound ejecting hole from the central axis of the diaphragm is provided on the inner wall of the resonant chamber so as to surround the central axis of the diaphragm.

Abstract: A damper for a loud speaker is produced by molding a substrate into a desired shape in which a fabric or knitted cloth composed of core-sheath type conjugate fibers composed of filaments having a core-sheath type structure is used as the substrate. A resin used for forming a core material in the core-sheath type structure functions as a matrix of the substrate. A sheath material having a lower melting point than that of the core material functions as an excipient, and is fused by a heat treatment and then solidified during the molding process, so as to bond together the intersections of fibers constituting the substrate and to cover the surface of the fibers. Thus, only a simple substrate production process is required and a damper for a loud speaker having excellent moldability, water-proofness, and durability is obtained.

Abstract: A speaker has a diaphragm of which plane shape as seen from a vibrating direction has a major axis and a minor axis, a band-shaped edge connected to the outer circumference of the diaphragm for holding so that the diaphragm may be free to vibrate, and a frame for holding the outer circumference of the edge, wherein a viscoelastic member is affixed to part of the edge and/or diaphragm.