Abstract: An elliptical speaker system is provided for in-wall/in-ceiling mounting. The speaker system comprises an elliptical speaker frame or bracket defining a speaker front plane having a generally arcuate inner surface. First and second speaker components are mounted within the speaker frame, on opposing sides of the speaker inner surface. At least one of the speaker components may be translatable within the speaker frame.

Abstract: A speaker surround is provided with a roll part with the curved central part, installed along the periphery of a cone-shaped speaker cone paper (diaphragm), a plane part to fix it to a frame, a junction part to join it to the speaker cone paper (diaphragm), and a reinforcing member installed inside the speaker surround. The reinforcing member is a mesh member installed inside the speaker surround and deforms easily according to the displacement of the speaker cone paper (diaphragm), however it has a structure and an arrangement with no expansion and contraction upon deforming. The mesh article is sandwiched between materials such as urethane foam and integrated by for example heat molding. As material of the reinforcing member, aromatic polyamide fiber, cotton, polyester fiber, olefin fiber, nylon fiber and the like are mentioned, which are formed in mesh by plain weaving, honeycomb weaving, triaxial weaving or the like.

Abstract: A diaphragm is gained by the co-molded of a dome part, a voice coil junction part, a cone part and a peripheral part through the injection mold of thermoplastic resin. The thickness of the central part of the dome is made great so that the resonance amplitude in this part becomes small. In addition, an annular rib is integrally provided to the voice coil junction part so as to increase the junction strength between the diaphragm and the voice coil bobbin. Thus, the electromagnetic driving force of the voice coil can be effectively transmitted to the diaphragm so that a loud speaker with excellent characteristics can be gained.

Abstract: The present invention Structure Improvement for Speaker Unit is disclosed. The speaker unit includes voice coil and housing of yoke as the main body, and above the circular slot hole that is used to accommodate the voice coil and yoke is bond with a surround and a diaphragm, the inner and outer fringes of its surround respectively formed the first skirt and the second skirt, so its surround incorporates the first skirt and the fringe of circular slot hole in the way of lap joint, and the inner fringe of the second skirt is provided for the joint of the diaphragm; the key point is: the out fringe of the diaphragm fitted to form a third skirt, thereby the diaphragm combines the surround as a configuration due to the binding between the third lap and the second skirt in the way of lap joint, besides a definite region for coating, support and fix emerged by setting the outer fringe of the diaphragm, so as to facilitate the operation for coherence between the membrane and the surround.

Abstract: The present invention provides a speaker device in which assembly is easy, and which has high sensitivity and low distortion. The speaker device comprises a frame member, a piezoelectric element to which a sound signal is applied, a diaphragm attached to the piezoelectric element, a coil for boosting the sound signal, and a damper attached to the piezoelectric element in the opposite side face to the diaphragm to elastically support the piezoelectric element. The coil is wound with respect to the frame member, and the damper is attached on the frame member.

Abstract: A loudspeaker comprising a moving coil and a membrane fastened to a chassis, where the membrane is divided into a concentrically disposed inner membrane part and a concentrically disposed outer membrane part, whereby a meeting area is defined between the inner membrane part and the outer membrane part, the inner membrane part being fastened to an inner moving coil and the outer membrane part being fastened to an outer moving coil.

Abstract: A case is provided for mounting an information equipment and a frame of the compound sound generator is set in the case. A speaker and receiver are provided in the frame. A first back chamber is formed in the speaker and a second back chamber is formed in the receiver. A baffle is formed integrally with the frame so as to separate the first and second back chambers from each other.

Abstract: This invention is an electro-dynamic loudspeaker that alters, controls and/or enhances the acoustical directivity pattern of an electro-dynamic loudspeaker through amplitude shading of the thin film diaphragm of the electro-dynamic loudspeaker and/or through the variation of the physical configuration and dimensions of the loudspeaker.

Abstract: A loudspeaker comprising an enclosure 31 provided with a second diaphragm disposed at an opening, and at least one sound generator 40 coupled acoustically with the enclosure. The sound generator is provided with a first diaphragm 27, wherein the second diaphragm has an area greater than an area of the first diaphragm. In the present invention, shape of the enclosure, positioning and shape of the first and the second diaphragms can be designed at a designer's option. Thus a small-sized electronic apparatus can be obtained with a greater designing freedom, while a large-sized diaphragm prevents a decrease of generated sound pressure.

Abstract: A speaker includes a housing having a diffusion opening provided with a laser vibration diaphragm. The laser vibration diaphragm has reflective spatial patterns, so that the speaker may present multiple-image variations under different rays of light, thereby enhancing a viewing effect and aesthetic quality of the speaker. Thus, the laser vibration diaphragm may produce spatial variations by the difference of incident angles of the light, thereby obtaining a viewable strong sensation to the people, and thereby enhancing the viewing effect and aesthetic quality of the speaker.

Abstract: A panel form acoustic member capable of supporting bending wave vibration has the bending wave velocity varied in the region of coincidence to provide a range of coincidence frequencies, for causing the acoustic coupling of the bending waves in the panel to occur over a broader range of angles or for making the coupling more uniform. The member may be incorporated in a loudspeaker having a panel member (1) and an exciter (3) fixed to the panel member to excite bending waves in the loudspeaker to cause an acoustic output.

Abstract: In an electro-dynamic loudspeaker, vent holes are optimized to provide improved the magnetic flux characteristics while maintaining sufficient ventilation. In addition, ported and unported enclosures may be utilized with the electro-dynamic loudspeakers to enhance low frequency performance.

Abstract: A positioning device for a diaphragm of speakers includes an inner ring and an outer ring with a plurality of connection plates connected between the inner ring and the outer ring. The positioning device is attached to a side of the diaphragm and has a wave-shaped cross section which is complimentary to a shape of the diaphragm. The diaphragm is retained by the positioning device and will not shifts during operation.

Abstract: An electricity-to-sound transducer has a diaphragm having an asymmetric shape which is flat when viewed from a direction of vibration, with major and minor axes, having continuous curvatures of concavity and convexity in a direction of sound irradiation, provided with a slot formed almost at a center of the diaphragm in a direction perpendicular to a longitudinal direction of the diaphragm. An edge portion is formed as surrounding an outer periphery of the diaphragm, an inner section of the edge portion being connected to the outer periphery, the edge portion sustaining the diaphragm so that it can vibrate. A voice coil bobbin has a winding portion around which a voice coil is wound split into two portions in the longitudinal direction of the diaphragm, the bobbin being attached to a rear surface of the diaphragm while the two portions are joined to each other, the joined portions forming a reinforcing beam that reaches a rear surface of a bottom of the slot of the diaphragm.

Abstract: A speaker capable to playback in wide frequency range by means of reducing peak values of amplitude of resonance frequencies in frequency characteristics is provided by means of differing a radius of curvature R1 of an inner diaphragm 10a and a radius of curvature R2 of an outer diaphragm 10b to differ resonance frequencies of the inner diaphragm 10a and the outer diaphragm 10b. Furthermore, by means of equalizing an area S1 of the inner diaphragm 10a and an area S2 of the outer diaphragm 10b, sound pressure levels of the inner and outer diaphragms 10a, 10b are equalized with each other.

Abstract: A vibrating plate is mounted in a case, and a first coil is secured to the vibrating plate. A magnetic circuit composition is mounted in the case. The magnetic circuit composition comprises a yoke having a flange and a core formed on the flange, an annular magnet mounted on the flange of the yoke, and a top plate comprising an annular portion and a cylindrical portion projection from a peripheral portion of the annular portion. The magnetic circuit composition is resiliently supported in the case. A coil holding plate is secured to the case, and a second coil is secured to the coil holding plate. The first coil is inserted in a first magnetic gap formed in the magnetic circuit composition and the second coil is inserted in a second magnetic gap formed in the magnetic circuit composition.

Abstract: An outer end portion 21A of an edge 21, which is formed at an interior of an outer periphery thereof, is mounted on an attaching surface 10b which is formed inside an outer peripheral rim 10a of a speaker frame 10. An outer peripheral surface 21a of the outer end portion 21A is allowed to abut on the outer peripheral rim 10a of the speaker frame 10. Also, an attaching screw section 14 of the speaker frame is provided on the attaching surface 10b. The outer end portion 21A has a wall thickness thicker than the thickness of a screw head of the attaching screw section, and is provided with a notch 21b to avoid the attaching screw section 14. Therefore, the inside area of the speaker frame can be effectively utilized to obtain enough level of outputted sound pressure. Further, since a gasket is unnecessary for positioning and attaching the edge, the number of parts can be reduced to lead cost-down.

Abstract: The present invention relates to an electro-acoustic transducer suitable for applications within mobile communication equipment and hearing aids. The transducer comprises two diaphragms positioned on opposite sides of a magnetic circuit having two magnetic gaps. When used as a microphone the transducer is substantially insensitive to vibrations, and when used as a speaker the transducer generates only very low vibration levels. The magnetic circuit has a number of advantages compared to conventional transducers with circular magnetic. The transducer can be made lightweight and with very compact dimensions compared to conventional designs. In a preferred embodiment the diaphragms are rectangular. The transducer may additionally be used as a vibration generator for silent alarm signals.

Abstract: A diaphragm of electroacoustic transducer has an edge formed with alternately up-rolled and down-rolled portions with respect to vibration plane of the diaphragm and disposed at regular intervals in circumferential direction and with sloped-plane portions respectively connecting rims opposing above and below of adjacent ones of the up-rolled and down-rolled portions, the sloped-plane portions extending in respective tangential lines with respect to an inner periphery of the edge and intersecting the circumferential direction at an alternately opposite angle with respect to the vibration plane.

Abstract: An electroacoustic transducer (1) has a magnet system (7) and a moving coil (15), which is disposed in the air gap (14) of the magnet system (7), and a diaphragm (17) attached to the moving coil (15). The diaphragm (17) has a mounting zone (24) for mounting the moving coil (15), and projections (25) in the mounting zone (24). The diaphragm (17) also has an interspace between every two projections (25), and two stabilizing walls (32, 33), which are inclined with respect to the diaphragm axis (18), are arranged in each interspace and are arranged so as to form a roof shape and are formed so as to project beyond the mounting zone (24) in radial directions.

Abstract: A loudspeaker comprises a motor structure including a voice coil with a hollow former, a frame having an upper end and a lower end connected to the motor structure, an upper suspension mounted to the upper end of the frame, and, a two part diaphragm structure which includes an upper diaphragm connected to the upper suspension and a lower diaphragm extending between the upper suspension and the voice coil in position to overlie the hollow former of the voice coil.

Abstract: A speaker has a magnet structure mounted ahead of the speaker diaphragm to produce a shallow compact unit. The magnet structure defines a flux gap, and a voice coil residing in the flux gap is connected to a main diaphragm such that drive current applied to the voice coil moves the diaphragm to generate sound. The voice coil and magnet structure provide a flux gap at the rear of the magnet structure, ahead of and centered on the main diaphragm, while the magnet occupies space within the cone, freeing up space in the rear. In one embodiment, the magnet structure has an additional flux gap located at its forward end and the speaker includes an additional diaphragm driven by a coil positioned in the additional flux gap. The main diaphragm and additional diaphragm are better positioned to maintain a common sound center for enhanced spatial fidelity and different tuning techniques present a broad flat response below crossover to form a pinpoint sound source of wide angular coverage.

Abstract: A receiver, such as for use in a hearing aid, is disclosed. The receiver comprises a housing and a diaphragm assembly disposed within the housing. The diaphragm assembly acoustically divides the housing into a front volume and a back volume. The diaphragm assembly comprises a paddle having a perimeter, a flexible annulus connected to the paddle, and a diaphragm support, wherein the diaphragm support secures the perimeter of the annulus to the housing. The receiver further comprises a plurality of apertures in the diaphragm assembly, wherein the plurality of apertures provides an acoustic distortion of no greater than 2% THD.

Abstract: A planar-type loudspeaker is provided which includes at least two separate, substantially flat, substantially coplanar diaphragms driven by a common drive mechanism. The diaphragms are each of a material and are dimensioned so that each has only a limited number of natural modes of vibration in the frequency band in which it is to operate and that corresponding natural modes for the diaphragms are close enough to achieve beneficial mechanical coupling and acoustics interference so as to provide a generally uniform acoustic pressure response over the selected frequency band. The diaphragms are preferably coupled only through the drive mechanism and it is preferable that each diaphragm have only two natural modes of vibration in the selected frequency band.

Abstract: The present invention relates to an improved speaker which includes at least one radiating surface configured to vibrate to produce sound waves, and an existing speaker cone configured to vibrate to produce sound waves, wherein said at least one radiating surface is adapted to fit over or onto the existing speaker cone, the said at least one radiating surface having a direct or indirect airtight attachment to the existing speaker cone to provide a hermetically sealed cavity between the existing speaker cone and said at least one radiating surface.

Abstract: A speaker cone is provided that contains a base portion, and the base portion has a front end and a rear end. The front end contains a plurality of discontinuities such that a first distance from a reference point on a longitudinal axis of the base portion to a first point on the front end is different than a second distance from the reference point to a second point on the front end. By creating the plurality of discontinuities in the front end of the base portion, the distortion or reduction in the amplitude of a flexural wave generated by the speaker cone is dramatically reduced.

Abstract: A loudspeaker comprises a motor structure including a voice coil with a hollow former, a frame having an upper end and a lower end connected to the motor structure, an upper suspension mounted to the upper end of the frame, and, a two part diaphragm structure which includes an upper diaphragm connected to the upper suspension and a lower diaphragm extending between the upper suspension and the voice coil in position to overlie the hollow former of the voice coil.

Abstract: A diaphragm is gained by the co-molded of a dome part, a voice coil junction part, a cone part and a peripheral part through the injection mold of thermoplastic resin. The thickness of the central part of the dome is made great so that the resonance amplitude in this part becomes small. In addition, an annular rib is integrally provided to the voice coil junction part so as to increase the junction strength between the diaphragm and the voice coil bobbin. Thus, the electromagnetic driving force of the voice coil can be effectively transmitted to the diaphragm so that a loud speaker with excellent characteristics can be gained.

Abstract: A low frequency loudspeaker comprises a conventional electromagnetic cone driver 4 having a cone diaphragm 9 provided with an inner suspension 8 and a role surround 12. The cone diaphragm 9 is connected, between the suspensions 8 and 12, to a flat diaphragm 11 whose ends are mechanically terminated so as not to be entirely free to move.

Abstract: A loudspeaker is provided including a diaphragm having a lower end formed with an inner surface mounted to the voice coil former, an outer surface spaced from the inner surface and a number of circumferentially-spaced vent bores formed between the inner and outer surfaces which vent a dust cap cavity. Alternatively, the lower end of the diaphragm is mounted to the outer surface of the voice coil in position so that a deflector formed in such lower end is located in the path of a flow of air entering and leaving the dust cap cavity through vent bores formed in the voice coil former to direct such air flow over the wire winding of the voice coil and obtain at least some cooling thereof in addition to venting the dust cap cavity.

Abstract: Acoustic devices have members extending transversely of thickness and capable of sustaining bending waves causing consequential acoustic action by reason of areal distribution of resonant modes of natural bending wave vibration consonant with required achievable acoustic action of said member over a desired operative acoustic frequency range. Areal distribution of stiffness including variation(s) therein is used to get desired locations for bending wave transducers and/or good resonant mode acoustic action from inherently unfavorable shapes of members. Members with combined pistonic action drive and bending wave excitement at centers of mass and geometry are featured.

Abstract: The invention presents a sound reproduction device which operates in accordance with the flexural wave principle. Such devices have in common that a panel 10 is provided in which flexural waves are produced by a drive arrangement 16. The drive arrangements 16 in the state of the art are connected to one of the surfaces of the panel 10 and are held by a support structure which functions as a countersupport. Such support structures either hinder the propagation of the flexural waves along the surface of the panel 10 and/or lead to an increase in the constructed depth of such a sound reproduction device. To avoid these disadvantages of the state of the art, the drive system 16 is located in a cutout 15 of the panel 10.

Abstract: A loudspeaker has a frame, a magnetic circuit formed on the frame, a voice coil bobbin disposed in a magnetic gap of the magnetic circuit, and a diaphragm connected to the voice coil bobbin at an inner periphery and to the frame at an outer periphery thereof. The diaphragm is folded at a position between the inner and outer peripheries to form an annular ridge. The ridge is projected in an axially inner direction of the loudspeaker.

Abstract: A thin-type speaker having a secondary diaphragm. The speaker including an enclosure, a diaphragm, a yoke, a sound coil, a magnet, and a washer. The surface of a first diaphragm is covered by a secondary diaphragm. The secondary diaphragm is made of sponge, cloth, paper, cardboard or isolating fabric. A thin-type speaker constructed according to the invention can produce larger tensioning as the power increases so that the speaker has a substantially larger flat effective bandwidth and less vibration noise.

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: A flat loudspeaker of superior quality for use in audio appliances, in which loudspeaker the generation of abnormal sounds is eliminated by placing a voice coil with a high accuracy in the magnetic gap. A diaphragm is split into a main diaphragm (11) and a sub-diaphragm (12); a voice coil (8) is connected to the inner circumference of the main diaphragm (11) whose inner diameter is substantially identical with the diameter of the magnetic gap (5). In the loudspeaker, the voice coil (8) is placed in a right positioning without inclination and eccentricity relative to the magnetic gap (5), abnormal sounds are eliminated, and a thinner configuration and a lower rejection rate are made compatible.

Abstract: An electroacoustic transducer (1) having a voice coil (17) and having a diaphragm (19) with an annular intermediate zone (22) for securing the voice coil (17), the intermediate zone (22) having angularly spaced-apart trough portions (29) which are each bounded by a trough bottom wall (30) and two trough side walls (31, 32), and the voice coil (17) being secured to the trough bottom walls (30).

Abstract: In a loudspeaker, a diaphragm is equally divided circumferentially into a plurality of regions which have the same shape with each other. Each of the divided regions is formed by a hyperbolic paraboloid. The hyperbolic paraboloid is obtained by moving a straight line connecting between two segments along these two segments. The hyperbolic paraboloid is large in strength and can suppress generation of the dividing vibration of the diaphragm.

Abstract: An improved transducer which includes a rigid frame and a permanent ring magnet mounted to the frame. A small bobbin, preferably formed of aluminum foil, is sized and arranged to fit within the open end of the magnetic gap while permitting motion of the bobbin therein. A voice coil is wound on the bobbin and connectable to receive an audio signal, similar to a conventional voice coil driver system. A pair of flexible, curved diaphragms are disposed in the frame, generally free to move except for a distal end of each diaphragm which is fixed to the frame. The diaphragms can be of generally cylindrical or partial-cylindrical shape.

Abstract: A double cone-type loudspeaker which comprises a subcone made of highly heat-conductive material, attached to the front of the main cone and to a voice coil bobbin made of highly heat-conductive material. Heat generated in the coil portion of the voice coil travels directly to the bobbin portion and subcone, and is released to the front of the speaker. Consequently, a double cone-type loudspeaker with high maximum input power and high heat radiating capability is achieved.

Abstract: The present invention relates to a structure of speaker which includes a disk body directly connected to the opening of a sound coil in a speaker. The disk body has a couple of reinforcing heat-sinking rings, and the opening edge of disk body is connected with the belly plate of speaker. The speaker of such structure is effective to radiate heat produced from the sound coil through the direct connection of the disk body with the sound coil and due to the light-weighted and thin metallic disk body having effective heat radiation so as to prolong the duration of play as well as the life span of the speaker. The end of the disk body projecting in the sound coil and the other end connected to the belly plate increases the capacity of resistance of the vibration wave and therefore one single speaker may provide an output as a tweeter and a woofer. The disk body directly connecting to the sound coil may give high fidelity of the vibration wave arising from movement of sound coil so as to improve sound quality.

Abstract: A light and cost effective speaker is provided which is suitable for a vehicle mount speaker, thin, and has a broad reproduction frequency band. Like a cone diaphragm and a center cap or the like, the cone diaphragm having a valley at the junction point with the center cap is integrally mounted with the center cap, and a plurality of voice coils, preferably three or more voice coils, are radially disposed along the valley or at the area near the valley to drive the diaphragm.