Abstract: A loudspeaker provided with a frame (101), a membrane (103) and a drive unit (105). The membrane has an outer circumferential edge (104a) suspended from the frame and an inner circumferential edge (104b). The drive unit has a stationary part (106a) secured to the frame and a translatable part (106b) provided with a coil support (108b) secured to the inner circumferential edge of the membrane. The membrane includes a membrane body (104) which, viewed in a circumferential direction, has a pattern of folds radially extending between the inner circumferential edge and the flat outer circumferential edge of the membrane. The folds have a depth (d), which increases from the edges (104a, 104b) towards an area (104A) situated between both edges. In this area, the folds are provided with faces (204C), to which a spider (111) of the loudspeaker is secured. This loudspeaker combines a small height with a large stroke of the membrane.

Abstract: The typical micro-transducer dedicated for mobile phones and headphones produces at high output in small back enclosure significant distortion in the acoustical output. These typical micro-transducers are designed for very high sensitivity and their mechanical suspension compliances are designed for worst case scenario, free air environment or a very large back enclosure (were the air stiffness from the back enclosure is much lower than the mechanical transducer suspension stiffness). This leads to poor low frequency response, high distortion, non-linear SPL characteristic and unnecessary high system resonance fre-quency when the transducer is placed in a small back enclosure.

Abstract: A loudspeaker apparatus in which a diaphragm is reinforced easily and favorably. The loudspeaker apparatus includes a loudspeaker diaphragm formed by joining a domed diaphragm and an edge-like diaphragm and vibrated using a voice coil, and a reinforcement ring reinforcing a junctional flat portion or the vicinity of the junctional flat portion of the diaphragm. The reinforcement ring is formed of a permeable material, and the permeable reinforcement ring is stuck to the junctional flat portion or the vicinity of the junctional flat portion of the diaphragm.

Abstract: A speaker comprises a diaphragm, a drive assembly for producing movement of said diaphragm responsive to an applied electrical signal to generate audible sounds, and at least one mechanical dampener applied to a surface of the speaker to dissipate energy when the dampener is impacted by said diaphragm.

Abstract: A voice coil 6 is movably disposed in a magnetic gap 5. A drive cone (first diaphragm) 11 and a diaphragm (second diaphragm) 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: An acoustic transducer comprises one or more electromagnetic motors that drive one or more sets of multiple diaphragms to provide acoustically efficient loudspeaker systems having dimensions that allow use in applications that would be difficult or impossible with traditional transducers. The diaphragms may be driven directly, inertially or fluidically. If diaphragms are driven by rods that pass through holes in the diaphragms, noise may be generated by air that leaks through the pass-through holes. This noise may be reduced or eliminated by measures that reduce or eliminate the air leakage.

Abstract: A method for fabricating a quartz nanoresonator which can be integrated on a substrate, along with other electronics is disclosed. In this method a quartz substrate is bonded to a base substrate. The quartz substrate is metallized so that a bias voltage is applied to the resonator, thereby causing the quartz substrate to resonate at resonant frequency greater than 100 MHz. The quartz substrate can then be used to drive other electrical elements with a frequency equal to its resonant frequency. The quartz substrate also contains tuning pads to adjust the resonant frequency of the resonator. Additionally, a method for accurately thinning a quartz substrate of the resonator is provided. The method allows the thickness of the quartz substrate to be monitored while the quartz substrate is simultaneously thinned.

Abstract: Methods for integrating quartz-based resonators with electronics on a large area wafer through direct pick-and-place and flip-chip bonding or wafer-to-wafer boding using handle wafers are described. The resulting combination of quartz-based resonators and large area electronics wafer solves the problem of the quartz-electronics substrate diameter mismatch and enables the integration of arrays of quartz devices of different frequencies with the same electronics.

Abstract: It is an object of the present invention to provide a vibrating plate of a dynamic microphone and a method of manufacturing the vibrating plate. The vibrating plate includes a center dome and a sub-dome which includes a damping thin film having stable quality. Referring to FIG.

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).

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: This invention discloses a loudspeaker 100 that includes a casing 110, a drive assembly 111 with a magnetic core 112, and an induction (voice) coil 113 attached to a first rigid plate 114 for the transmission of vibrations to a support 300. The first rigid plate 114 is attached to the casing 110 by a second plate 115 used for the suspension and the radial positioning of the voice coil 113, and elastic studs 116, used for the elastic suspension of the first rigid plate 114 in relation to the casing 110. By virtue of the invention a room can be transformed easily into an auditorium.

Abstract: A loudspeaker has a configuration in which edge diameter in the cross section of second edge coupled to suspension holder is set to be larger than edge diameter in the cross section of first edge coupled to diaphragm. With such a configuration, a loudspeaker with reduced harmonic distortion is provided.

Abstract: Disclosed is a speaker configured to reduce or eliminate distortions when a diaphragm thereof vertically moves in sound reproduction and which can be downsized. This speaker includes: a cylindrical frame having a bottom face and an open top; a magnetic circuit disposed on a inner bottom face of the frame; a voice coil having a coil portion thereof disposed in a magnetic gap of the magnetic circuit; the diaphragm disposed in an opening of the frame, and fixed to the voice coil along an inner periphery thereof, and to the frame via a first edge along an outer periphery thereof; and a support fixed to the diaphragm on the side of the magnetic circuit at one end and to the vicinity of the magnetic circuit via the second edge on the other end. The first edge is substantially analogous to the second edge in shape with respect to the boundary therebetween.

Abstract: To accurately tune the vibration frequency of a suspension during assembly. Secured positions 3e where a magnetic circuit part 2 is secured to a suspension 3 are provided near to each other. From among the secured positions 3e, secured positions 3e suitable for the characteristics of a suspension 3 to be mounted and the weight of a magnetic circuit part 2 are selected and secured to each other. Thus, the distance between the securing position and the central position of vibration of a suspension 3 and a housing 1 can be changed to tune the frequency to the desired value.

Abstract: A multifunction-type vibration actuator and a mobile terminal device capable of decreasing the lowest acoustic resonance frequency and preventing breakage of a coil lead as well as improving acoustic characteristics and preventing sound leaks. A portion near the outer periphery of a diaphragm 3 is bent to form a rising portion 3b extending along an inner periphery 1a of a housing 1 toward an open end thereof. This rising portion 3b serves as a corrugation to decrease the lowest resonance frequency and the amplitude of vibration of which a fulcrum is served by the rising portion 3b is not so large as that of the corrugation. Accordingly, the coil lead of a voice coil 4 is not easily broken. Furthermore, an extending portion 3c is formed to extend outward along a flat surface 1b formed at the open end of a housing 1 from a rising portion 3b. This enlarges the entire radius of the diaphragm 3 and improves the acoustic characteristics.

Abstract: A speaker apparatus including: a first diaphragm; a second diaphragm arranged coaxial with the first diaphragm along a driving direction; a frame having diaphragm supporting portions; and a voice-coil bobbin, wherein outer circumferential portions of the first diaphragm and the second diaphragm are fixed to the diaphragm supporting portions respectively, inner circumferential portions of the first diaphragm and the second diaphragm are connected together and fixed to the voice-coil bobbin so as to make a sealed space between the first diaphragm, the second diaphragm and the frame, and the voice-coil bobbin is supported by springiness of a gas contained in the sealed space.

Abstract: A loudspeaker driver that includes a suspended diaphragm and a plurality of voice coils each suspended in a magnetic field and coupled to the diaphragm.

Abstract: A speaker device includes a terminal member, a connecting member and a voice coil. The connecting member has a terminal mounting part, a flat surface and a recessed portion. The terminal member is mounted to the terminal mounting part. On the flat surface, an inner peripheral edge portion of a diaphragm is mounted via an adhesive. A lead wire drawn from the voice coil is drawn along an outer peripheral wall of the voice coil bobbin and inside the recessed portion to be electrically connected to a connecting part of the terminal member. Thus, the lead wire is not sandwiched by the flat surface and the diaphragm. Thereby, at the time of driving the speaker device, pressure is not given to the lead wire drawn into the recessed portion from the diaphragm and the connecting member. The cut of the lead wire can be thus prevented.

Abstract: A loudspeaker includes a frame; a magnetic circuits 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 diaphragms 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 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: A loudspeaker and components for use in the construction thereof is provided. In one aspect, the present invention relates generally to a new type of loudspeaker comprising a driver having a sound radiating element, at least two motor elements which, in operation, cooperate to move the sound radiating element in response to an applied signal, and mounting elements coupled to the sound radiating element and motor elements, where the first motor element is mechanically coupled to the sound radiating element, and where the driver comprises at least two mechanical masses which, in operation, move independently in response to the applied signal. The mechanical masses are mechanically coupled such that in operation, the driver has at least fourth order frequency characteristics. This facilitates, for example, the construction of a fourth order loudspeaker system that performs like a vented enclosure system without employing a vent.

Abstract: A speaker system that includes a printed circuit board (PCB) and a speaker assembly. The speaker assembly is embedded in the PCB. The speaker assembly may include a coil, a magnet, and a diaphragm. The coil is embedded in a material of the PCB. The magnet is located within the PCB and attached to the diaphragm. The coil is usable as a T-coil for hearing aid compatibility. The speaker system may be included in any device such as a mobile phone, a personal digital assistant (PDA), a computer, an electronic game device, an electronic audio device, or an electronic video device.

Abstract: The invention relates to a micro-speaker with a second suspension made of highly resilient material installed inside of the speaker. The speaker is able to provide high level acoustic output with low distortion rate in a wide frequency range with a very small and slim structure and it may prevent a disconnection of a lead connecting the voice coil and the electrode. The speaker includes a yoke, a permanent magnet, a plate, a vibration plate integrated with a first suspension, a voice coil, a frame and a protector. The speaker further comprises a second suspension made of highly resilient material installed between the plate and the vibration plate, and is characterized in that the voice coil is attached to the lower surface of the second suspension and the vibration plate is attached to the upper surface of the second suspension and the vibration plate is attached to the upper surface of the second suspension and the outer periphery of the second suspension is fixed to the frame.

Abstract: A loudspeaker diaphragm having a small overall height dimension, in which a dome portion has a sufficient rigidity and which is capable of realizing a stable loudspeaker operation, wherein the loudspeaker diaphragm can realize a desirable sound reproduction without noise, or the like, with a frequency response that is flat over a wide range.

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: A speaker, which includes a bracket holding a magnetic loop assembly on the bottom side and a voice coil at the top of the magnetic loop assembly, a diaphragm covering the voice coil and having a stepped peripheral flange, and a suspension bonded between the stepped peripheral flange of the diaphragm and the bracket in a concentric manner relative to the diaphragm for linear reciprocating motion with the diaphragm to improve the output sound.

Abstract: An electroacoustic transducer employing a polymer connection for maximizing volume displacement. The transducer includes a diaphragm in a case and means for converting. The diaphragm includes a central portion. The means for converting converts between an electric signal and a vibration of the central portion of the diaphragm or vice versa while the diaphragm is coupled to the case. The central diaphragm has an outer edge, and between the outer edge and the inner wall of the transducer case a capillary space is present in which a polymer is provided as a coupling between the outer edge and the inner wall of the case.

Abstract: The present invention provides a loudspeaker diaphragm and an electrodynamic loudspeaker of an elongated shape being shorter in the minor-axis direction than in the major-axis direction, which have a desirable sound reproducing capability with a high efficiency and are not significantly influenced by divided vibrations of an elongated loudspeaker diaphragm, and which are suitably installed in devices such as display devices.

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

Abstract: A submersible loudspeaker assembly is provided. The loudspeaker assembly includes: a housing; a loudspeaker enclosed within the housing; an external diaphragm disposed adjacent to the loudspeaker. The external diaphragm is acoustically transparent when subject to ambient air pressure, but configured to flex towards the loudspeaker when submerged in water.

Abstract: The present invention provides a loudspeaker including an edge formed in such manner that a thickness of a sectional shape in a radial direction increases from an inner peripheral portion toward an outer peripheral portion. Due to this structure, a mechanical impedance of the edge against a diaphragm is decreased and bad influences on a vibration mode of the diaphragm are suppressed, and also, vibration energy is absorbed by a thick portion of the outer peripheral portion, thereby suppressing standing waves of the diaphragm.

Abstract: The present invention relates to a plate type speaker adapted to radiate sound by transforming horizontal vibration for vibrating a side of a diaphragm into vertical vibration of the diaphragm. The plate type speaker of the present invention comprises a plate-shaped diaphragm for receiving horizontal vibration to generate vertical vibration; a base frame having a fixing portion to which one end of the diaphragm is coupled; a voice coil plate that has one end connected to the other end of the diaphragm, is mounted on the base frame to horizontally vibrate and has a voice coil wound on either or both of surfaces thereof, and a magnetic body that has opposite polarities at positions spaced apart by predetermined distances from top and bottom surfaces of the voice coil plate and is coupled to the base frame.

Abstract: A speaker gasket and its manufacturing method, and a speaker device, the speaker gasket formed by a rectangular sheet with a flat opening of a girth of a prescribed length at the center and capable of significantly reducing the amount of wasteful material in manufacturing, the speaker device offering high reliability.

Abstract: A support structure for supporting and protecting the diaphragm of loudspeaker includes a first elastomer which has a first interface with a camber shape, a second elastomer which has a second interface with a complemental shape of the first interface, the first elastomer and the second elastomer combine together from both sides of the support part of the loudspeaker diaphragm. The separate support structure in the present invention is fit for many kinds of loudspeakers and propitious to increase the technical characteristics of loudspeakers.

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: Provided is a diaphragm edge of a speaker which is formed by compressing a material including silicon rubber and has an emboss portion on a front surface thereof so that sensitivity of sound is improved. Also, a diaphragm edge of a speaker is formed by compressing a material including silicon rubber and powdered viscose rayon and has an emboss on a front surface thereof.

Abstract: A loudspeaker includes a basket defining a center hole therethrough, a conduction wire board fixed to the bottom surface of the basket, a magnet placed on the basket, a diaphragm arranged on the basket and above the magnet, and a voice coil. The conduction wire board defines a core hole corresponding to the center hole, and two welding foils on the bottom surface. The magnet defines a through hole corresponding to the center hole. The voice coil is wrapped around the magnet and fixed to the bottom of the diaphragm. The voice coil has leading wires, which bend inward at the top and downward pass through the through hole of the magnet, the center hole of the basket and the core hole of the conduction wire board, and then extend toward two sides of the rivet for being welded on the corresponding welding foils.

Abstract: In one embodiment a loudspeaker includes a cylindrical, staged frame; an annular voice coil having coil wires mounted on a lower portion; an annular U type spaced around the voice coil and secured to a bottom of the frame, the U type including radial channels; a magnet on a center of the voice coil; a damper secured to the frame; a bridge including arms through the channels, the arms being secured between the voice coil and the damper; and a cone secured between a top of the frame and the voice coil above the coil wires. This construction can lower the center of gravity of the voice coil so that the loudspeaker can be made thin. Also, the voice coil is more stable when the loudspeaker is activating.

Abstract: A loudspeaker including a frame, a movable diaphragm that oscillates, and a suspension for mounting the diaphragm to the frame, where the suspension comprises a flexible surround having a substantially enclosed space where at least a portion of the flexible surround is air permeable.

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: An electromagnetic transducer including a frame, a diaphragm disposed within the frame and coupled to the frame such that the diaphragm may rotate relative to the frame, a panel-shaped former connected to the diaphragm, a conductive coil connected to the former, and a magnetic assembly including a gap in which a magnetic field is provided. The gap is positioned to receive the conductive coil, and the conductive coil is electrically charged within the gap to move such that the diaphragm rotates about a rotational axis to generate sound waves.

Abstract: A suspension with a plurality of roll sections each of which has a semi-cylindrical shape from a cross-section view. The roll sections are disposed side by side based on a straight line connecting two points on an inner periphery or an outer periphery. The roll sections form a closed loop in a manner that a roll section of the roll sections being disposed first adjoins a roll section of the roll sections being disposed last. Adjacent roll sections are coupled with each other through a boundary section forming a continuous three dimensional curved surface. A linearity of compliance improves, and generation of distortion or rolling is restricted using the suspension.

Abstract: A loudspeaker (1) having a piston resonance frequency (f0) is disclosed. The loudspeaker comprises (1) an acoustic member (4) intended to operation in piston mode and provided with a plate-like body (8), (2) a drive unit (6) for translating the acoustic member along a translation axis (x) oriented substantially perpendicular to a main face (8a) of the plate-like body, and (3) a frame (2) from which the acoustic member is flexibly suspended. The plate-like body is an easy-to-manufacture polycarbonate or polymethylmethacrylate sheet (8?) having a first break-up frequency (f1) which is higher than or equal to two times the piston resonance frequency (f0).

Abstract: Diaphragm (9) has through-hole (10) for fixing a voice coil at its center part, and has a fixing part of edge (12) at its outer periphery whose shape is substantially circular. The shape of the outer periphery of diaphragm (9) is formed as follows: first circle and second circle (9A, 9B) are overlapped each other with their center points (9a, 9b) displaced in such a manner that at least one part of an outer periphery of first circle and second circle (9A, 9B) forms a part of the substantially circular outer periphery of an entire shape. Signal reproduction characteristics can be flattened as much as possible by reducing a resonance level.

Abstract: A loudspeaker includes a frame, a magnetic circuit supported by the frame, voice coil body provided movably in relation to a magnetic gap provided at the magnetic circuit, a diaphragm having an outer rim being joined via a first edge to the frame and an inner rim being joined to the voice coil body, and a damper located towards the magnetic circuit from the diaphragm. The damper has an inner rim joined to the voice coil body. The damper has an outer rim joined via a second edge to the frame. The second edge protrudes towards the diaphragm or in a direction opposite to the diaphragm. The damper includes a first protrusion protruding towards the diaphragm and a second protrusion protruding in a direction opposite to a direction in which the first protrusion protrudes. A protrusion out of the first and second protrusions is closest to the second edge among the protrusions.

Abstract: Disclosed is a loudspeaker suspension structure having asymmetrical grooves. In an aspect, an apparatus includes a loudspeaker suspension structure having grooves, each extending from an inner circumferential border, to an outer circumferential border, at least one groove having a groove depth that varies asymmetrically from the inner circumferential border to the outer circumferential border.

Abstract: To propose a speaker unit and a speaker apparatus enabling to improve the strength of a voice coil bobbin and sound output in high quality with a simple structure, there are provided that a magnetic circuit forming a magnetic gap in slit form, a frame for storing and holding the magnetic circuit, a diaphragm attached to be vibratable to the frame, a flat-type voice coil bobbin disposed so as to pass through the almost center of the magnetic gap, in that its one end is combined with the diaphragm, a voice coil is adhered to its surface, and convex and concave parts for improving the strength of the diaphragm in the vibrating direction are formed on the surface, and a damper attached to the frame to support the other end of the flat-type voice coil bobbin.

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 loudspeaker including a frame, a movable diaphragm that oscillates, and a suspension for mounting the diaphragm to the frame, where the suspension comprises a flexible surround having a substantially enclosed space where at least a portion of the flexible surround is air permeable.