Abstract: The speaker of the present invention comprises a frame, a vibration system and a magnetic circuit system. The vibration system comprises a diaphragm and a voice coil assembly for driving the vibration of the diaphragm for generating sound, the diaphragm is located on the frame, and the voice coil assembly is connected with the diaphragm and the magnetic circuit system includes a first clamping plate, a yoke, and a main magnetic and a sub magnetic disposed in the yoke. Wherein the bonding portion of the first clamping plate and the sub magnetic is provided with an adhesive groove recessed from the bonding portion away from the sub magnetic. When the first clamping plate is bonded to the sub magnetic, the glue is filled between the first clamping plate and the sub magnetic and filled in the adhesive groove.

Abstract: The present disclosure provides a receiver module. The receiver module includes a receiver and a microphone. The receiver includes a holder, a vibration unit, a magnetic circuit unit, a front cover covering the holder and a cover plate. The vibration unit includes a diaphragm spaced apart from the cover plate to form a front cavity. The holder includes a holder body portion, a holder extension portion and a first through-hole. The front cover includes a front cover body portion, a front cover extension portion and a second through-hole. The microphone is fixed on a surface of the holder extension portion facing away from the cover plate. The front cavity, the second through-hole, the first through-hole and a sound inlet hole of the microphone communicate with one another. The microphone share the front cavity with receiver to absorb noise of the receiver, providing better sound effect.

Abstract: A speaker includes a frame having a receiving space, a vibration unit received in the receiving space, and a magnetic circuit unit for driving the vibration unit to vibrate and emit sound. The vibration unit includes a first diaphragm configured to vibrate and emit sound, and a voice coil for driving the first diaphragm to vibrate and emit sound. The speaker further includes a centering support sandwiched between the first diaphragm and the voice coil. In the speaker according to the present disclosure, by sandwiching the centering support between the voice coil and the first diaphragm, a positional conflict between the centering support and the main magnet is avoided, the main magnet can have an increased size, thereby enhancing the space utilization and sensitivity of the speaker, and improving the acoustic performance of the speaker.

Abstract: An electrodynamic transducer includes a rear frame defining an open frame interior, and a front frame enclosing the open frame interior and attached to the rear frame, the front frame including a center hub disposed about a central axis of the transducer. A movable diaphragm is positioned within the open frame interior and operably connected to the rear frame. A magnet assembly is disposed forward of the diaphragm and coupled to the center hub, the magnet assembly defining a magnetic air gap annularly disposed about the central axis. A voice coil is disposed in the magnetic air gap surrounding the magnet assembly and operably connected to the diaphragm. A first spider is coupled between the voice coil and the rear frame behind the diaphragm, and a second spider coupled between the diaphragm and the front frame and disposed forward of the diaphragm.

Abstract: There is described a tactile feedback actuator generally having a hammer path having a length extending between two opposite ends, a coil element fixedly mounted relative to the hammer path, a magnetic hammer guidingly mounted for movement along the hammer path. The magnetic hammer is electromagnetically engageable by a magnetic field emitted upon activation of the coil element so as to be longitudinally slid along the hammer path in any one of two opposite directions depending on a polarity of activation of the coil element. The tactile feedback actuator has at least one electropermanent magnet at at least one of the opposite ends of the hammer path, the electropermanent magnet having a magnetization direction aligned with the length of the hammer path, and at least one state toggling device configured for toggling a state of the electropermanent magnet between a magnetized state and an unmagnetized state.

Abstract: The present disclosure provides a speaker, including a flexible circuit board, a holder, a diaphragm received in the holder, and a voice coil for driving the diaphragm to vibrate. The flexible circuit board includes a connecting portion received in the holder and an extension portion extending from the connecting portion to outside of the holder. The voice coil is electrically connected to the connecting portion. The flexible circuit board further includes a first pad located at an upper surface of the connecting portion and electrically connected to the voice coil, and a second pad located at an upper surface of the extension portion. The extension portion is folded over with respect to the connecting portion, and a lower surface of the extension portion is attached to the holder.

Abstract: The present application discloses a miniature speaker, including: a frame; a vibration system positioned on the frame; a magnetic circuit system for driving the vibration system. The vibration system includes a first diaphragm fixed to the frame, a second diaphragm, and a voice coil for driving the first diaphragm to produce sounds. The second diaphragm includes a suspension, a first fastening portion fixed to the frame, a second fastening portion fixed to the voice coil at an end away from the first diaphragm. The suspension includes a main suspension and a pair of auxiliary suspensions extending from two edges of the main suspension along a length direction of the main suspension. A width of the main suspension is greater than a width of the auxiliary suspension. The rigidity of the second suspension is improved, and the lateral swing of the vibration system is suppressed.

Abstract: An electrodynamic sound transducer that includes a chassis, a membrane with a hole in the centre of the membrane, a moving coil, a magnetic system, and a resonator that is placed in the hole in the centre of the membrane.

Abstract: A universal police speaker includes an inner cavity, a voice coil, a magnet, a support plate, a diaphragm and a protecting cover to form a dome speaker structure. The inner cavity is filled with a sound absorbing material; the voice coil is installed around the inner cavity; the magnet is installed around the voice coil; the support plate is installed between the voice coil and the magnet; the diaphragm is installed at the top of the inner cavity; and the protecting cover is installed at the diaphragm. The speaker further includes a level bracket for placing the inner cavity, the voice coil, the magnet, the support plate, the diaphragm and the protecting cover, and the level bracket is disposed at the top of a car body of a police car. The invention can improve the anti-violence capability of the police speaker.

Abstract: The present disclosure provides a speaker assembly, including an upper cover and a lower cover forming an accommodation space, and a speaker fixed in the accommodation space. The upper cover includes a side wall, and the speaker divides the accommodation space into a front chamber and a rear chamber. The speaker assembly further includes an insertion plate located in the rear chamber. The speaker assembly includes a first limit structure, and one end of the insertion plate is inserted in the first limit structure for forming a sound absorbing chamber filled with sound absorbing material. The insertion plate includes a first part from the first limit structure and a second part. The speaker assembly is equipped with an insertion plate to enlarge the area of the sound absorption channel and further to improve the performance of the speaker assembly.

Abstract: The present invention discloses a speaker having a frame, a vibrating system and a magnetic circuit system. The vibrating system has a vibrating diaphragm, a voice coil and an elastic supporting assembly. The magnetic circuit system has a main magnet, a secondary magnet located on two opposite sides of the main magnet, a magnetic plate stacked on the secondary magnet and spaced away from the elastic supporting assembly, and an auxiliary magnet. The magnetic plate has a main body and a supporting portion extending from the main body towards the main magnet and spaced away from the main magnet. The auxiliary magnet is fixed on the supporting portion at the sides away from the vibrating diaphragm and spaced away from the main magnet. The speaker of the present invention has advantages of good reliability and excellent acoustic performance.

Abstract: An electro-acoustic driver includes a diaphragm formed of a compliant material, a bobbin configured to hold a winding of an electrical conductor and a housing having a housing axis that is substantially coaxial with the bobbin. The diaphragm is fixed to one end of the housing and has a substantially planar shape when the diaphragm is at rest. A stiffening element is fixed to an inner region of a surface of the diaphragm. A motion of the bobbin along a bobbin axis generates a movement of the inner region of the diaphragm to thereby generate an acoustic signal that propagates from the diaphragm.

Abstract: A speaker includes spacers that are disposed between a front end portion of a top yoke, which serves as a first member, and a back end portion of a back portion of a frame, which serves as a second member, to form a gap that defines an air passage. When a bobbin and a vibrating plate vibrate in a front-back direction, an airflow through the air passage, which faces a voice coil, is formed between the space around a magnetic gap and the outside. Accordingly, the voice coil is cooled over the entire circumference thereof.

Abstract: A loudspeaker magnetic circuit system includes an iron a magnetic steel, a spring washer, a voice coil and a U-shaped short-circuit ring. The U-shaped short-circuit ring includes a first ring body and a second ring body, and the voice coil is positioned and movable up and down in a U-shaped groove formed by the first ring body and the second ring body. Through making the short-circuit ring into a U-shaped structure and optimizing the connection relationship between the short-circuit ring and other components such as the spring washer, magnetic steel and iron, the present invention can effectively reduce the harmonic distortion and non-linear distortion of the loudspeaker and improve the overall acoustic performance of the speaker such that the sound quality of loudspeaker is improved.

Abstract: An apparatus includes a horn bracket, a magnet system and a vibration system, where the horn bracket includes a through hole configured for positioning the magnet system, the magnet system includes an inner magnetic ring and an outer magnetic ring sleeved on an exterior of the inner magnetic ring, the inner magnetic ring is coaxial with the outer magnetic ring, a gap is provided between an inner annular surface of the outer magnetic ring and an outer annular surface of the inner magnetic ring, where the inner annular surface and the outer annular surface have opposite magnetic polarities, magnetic flux lines formed in the gap by the outer magnetic ring and the inner magnetic ring are radially disposed, the vibration system includes a voice diaphragm, a voice coil having one end coupled to the voice diaphragm, and a winding coupled to the other end of the voice coil.

Abstract: A speaker includes a multi-magnet structure including at least an inner magnet and an outer magnet. A voice coil is suspended from a membrane into a gap between the inner magnet and the outer magnet, and a spider is attached to the membrane and suspended at least partially by the inner magnet. The spider is configured to stabilize the membrane throughout a range of movement responsive to a force generated by the voice coil and the multi-magnet structure.

Abstract: An electronic vibrator comprises a power source unit converting AC power into DC power, a bridge circuit comprising an insulated-gate bipolar transistor (IGBT) as a power switching device for driving a large-capacity oscillator, a circuit driving unit driving the bridge circuit and applying a sine wave which is a sine wave PWM modulation reference wave as well as a triangular wave, and a vibration generator connected to the bridge circuit, generating vibration by a current supplied by the bridge circuit.

Abstract: A particle beam device including a magnet, the device including: a particle beam source configured to emit electron and ion beams; a plurality of yokes arranged in a substantially rectangular shape; a coil set including a plurality of coils, wherein windings of the plurality of coils are uniformly distributed across and wound around the plurality of yokes, wherein the coil set is configured to produce both dipole and quadrupole fields, wherein the magnet is configured to deflect and focus electron and ion beams.

Abstract: An acoustic device includes a waterproof vibrating membrane and a magnetic component disposed below the waterproof vibrating membrane. The waterproof vibrating membrane includes a convex portion which protrudes toward a position of the magnetic component, or a concave portion which is recessed opposing to a position of the magnetic component. The magnetic component includes a concave pressure buffering portion corresponding to a shape of the convex portion of the waterproof vibrating membrane wherein the concave pressure buffering portion is recessed toward a side opposing to a side on which the waterproof vibrating membrane is located, or a convex pressure buffering portion corresponding to a shape of the concave portion of the waterproof vibrating membrane wherein the convex pressure buffering portion protrudes toward a side on which the waterproof vibrating membrane is located.

Abstract: A receiver is provided comprising an outside housing, and a magnetic circuit system and a vibration system accommodated in the outside housing. The vibration system comprises a vibration diaphragm and a voice coil. The outside housing comprises a first housing and a second housing matching with each other. The first housing and the second housing are provided with electrical connection structures conductive to one another thereon. The first housing is provided with a first elastic piece on a sidewall thereof. One end of the first elastic piece is welded with a spring electrically connected to an external circuit, and the other end is exposed at the outside of the sidewall of the first housing. The second housing is provided with a second elastic piece on a sidewall thereof.

Abstract: A speaker box includes a housing with an accommodating space and a housing wall; a propping wall extending from the housing wall toward the accommodating space; and a speaker unit located between the housing wall and the propping wall for dividing the accommodating space into a front cavity and a back cavity. The speaker unit includes a diaphragm located in the front cavity for forming a front sound cavity cooperatively with the housing, a sound guiding channel communicating the front sound cavity with outside, and a through hole penetrating the propping wall and communicating the sound guiding channel with the back cavity. The speaker box further includes an elastic cover plate covering the through hole completely for absorbing vibration energy at a specific frequency. The Young's modulus or strength of the elastic cover plate is smaller than that of the propping wall.

Abstract: A speaker module relates to the technical field of electroacoustic products, and comprises a lower module casing, an upper module casing and a steel sheet which are successively combined together. A speaker monomer is contained in a space enclosed by the lower module casing, the upper module casing and the steel sheet. The speaker monomer, the upper module casing and the steel sheet together enclose a front sound cavity of the module. The front sound cavity is in communication with a sound outlet hole of the module, and the sound outlet hole is located on a side part of the speaker monomer. A sheet is adhered inside the steel sheet, the thickness of the sheet being about 0.1 mm˜0.2 mm and the material of the sheet being a soundproof material.

Abstract: Acoustic conversion efficiency is improved and a stable signal reproduction operation is ensured. Provided is a speaker device including: a magnet; a yoke attached to the magnet and at least one sub-plate that is separated from the main plate in an axial direction of the central axis; a coil bobbin formed in a tubular shape and changeable in the axial direction; a voice coil wound around an outer circumferential surface of the coil bobbin, at least a portion of the voice coil being disposed in a main magnetic gap formed between the main plate and the yoke; a vibration plate having an inner circumferential portion connected to the coil bobbin; and a magnetic fluid filling at least one sub-magnetic gap formed between the sub-plate and the yoke, wherein a through-hole positioned in the sub-magnetic gap filled with the magnetic fluid is formed in the coil bobbin.

Abstract: An integrated speaker and lamp assembly includes a speaker diaphragm and a light source directing light through the speaker diaphragm. A related method of integrating a speaker and a lamp is also disclosed.

Abstract: Embodiments are provided for components configured for audio playback. According to certain aspects, a transducer includes dual voice coils disposed in a magnet section, whereby the magnet section generates an electromagnetic field that causes the dual voice coils to actuate in response to an applied audio signal. The transducer further includes a diaphragm coupled to the dual voice coils that actuates according to the dual voice coils and produces audio output. In some implementations, the transducer may be disposed within a cutout area of an electronic device, whereby the transducer is secured to the electronic device via a roll-surround suspension.

Abstract: An inertial electroacoustic transducer unit has a first exciter and a second exciter, the second exciter is disposed in overturned position on the first exciter. In a first configuration, the bases of the two cups face each other, or in a second configuration the cavities of the two cups face each other. The two exciters are fixed together or to a plane intended to be put into vibration in such manner that the axes of the cylindrical supports of the coils coincide. The ends of the coils of the two exciters are connected in counter-phase in such manner to obtain a consistent movement in the same direction as the magnetic units of the two exciters.

Abstract: A speaker is provided in the present disclosure. The speaker includes a magnetic circuit system for providing magnetic field, a diaphragm, a suspension, a drive mechanism and a horizontal former, which is retained on the surface of the diaphragm directly facing the magnetic circuit system. The diaphragm is suspended above the magnetic circuit system for generating sound by vibrating. The suspension is used to suspend the diaphragm above the magnetic circuit system. The drive mechanism is disposed under the diaphragm and can interact with the magnetic circuit system so as to drive the diaphragm to vibrate in order to generate sound. The horizontal former is retained on the surface of the diaphragm directly facing the magnetic circuit system, wherein the horizontal former is provided with a communication space which communicates the space under the diaphragm and the space under the suspension.

Abstract: Acoustic conversion efficiency is improved and a stable signal reproduction operation is ensured. Provided is a speaker device including: a magnet; a yoke attached to the magnet and at least one sub-plate that is separated from the main plate in an axial direction of the central axis; a coil bobbin formed in a tubular shape and changeable in the axial direction; a voice coil wound around an outer circumferential surface of the coil bobbin, at least a portion of the voice coil being disposed in a main magnetic gap formed between the main plate and the yoke; a vibration plate having an inner circumferential portion connected to the coil bobbin; and a magnetic fluid filling at least one sub-magnetic gap formed between the sub-plate and the yoke, wherein a through-hole positioned in the sub-magnetic gap filled with the magnetic fluid is formed in the coil bobbin.

Abstract: A speaker is provided in the present disclosure. The speaker includes a shell, a magnetic system and a vibrating system received in the shell. The vibrating system includes a membrane module and a coil assembly connecting to the membrane module for driving the membrane module to vibrate. The magnetic system includes a first magnet module and a second magnet module. The first magnet module and the second magnet module are opposite to each other to form a magnetic gap, and the coil assembly is arranged in the magnetic gap. The coil assembly includes a coil and a coil support for supporting the coil. The first magnet module includes a pair of first grooves formed at two opposite edges thereof, the first grooves are adjacent to the membrane module and face the coil assembly.

Abstract: A speaker including a speaker apparatus and a lighting apparatus are provided. The speaker having a conical vibration portion, and a lighting apparatus insertedly disposed at a center of the conical vibration portion to emit light to the conical vibration portion, so that efficient lighting is ensured and light is adjusted depending on the acoustic signal, thereby maximizing the visual sound effect.

Abstract: A loudspeaker includes two first magnetic portions arranged in parallel and a second magnetic portion disposed between the two first magnetic portions on a bottom plate. An annular top plate is provided to the two first magnetic portions and disposed in such a manner as to form a magnetic gap with respect to the second magnetic portion. The first magnetic portions and the second magnetic portion are magnetized in the opposite directions in a direction in which the bottom plate, the first magnetic portions and the top plate are stacked. The top plate includes two main bodies provided to the two first magnetic portions and two bending portions connecting between two first magnetic portions and bending toward the bottom plate.

Abstract: A micro electro-mechanical system (MEMS) acoustic sensor is disclosed. The acoustic sensor comprises a backplate and a diaphragm. The acoustic sensor further comprises a flexible member and optional spacer member disposed between the backplate and the diaphragm resulting in a gap between the backplate and the diaphragm. The gap can vary in response to impinging pressure on the diaphragm based on the design of the flexible member and resulting in a variable capacitance between the backplate and the diaphragm. The change in the gap can result in a change in an electrical characteristic associated with the variable capacitance and can be converted to an electrical output signal corresponding to the impinging pressure on the diaphragm. The flexible member can be part of the backplate or diaphragm.

Abstract: A speaker is provided in the present disclosure. The speaker includes a shell, a magnetic system and a vibrating system. The shell includes a cover and a frame assembled with the cover for forming a receiving cavity. The magnetic system is received in the receiving cavity for providing a magnetic gap. The vibrating system includes a diaphragm and a coil module suspended in magnetic gap, the coil module is connected to the diaphragm for driving the diaphragm to vibrate, the diaphragm includes a main body, a periphery surrounding the main body and a connecting part extending outwards from the periphery. The main body is non-coplanar with the connecting part.

Abstract: An electro-acoustic device is provided, including a frame; a magnetic circuit received in the frame and including a lower plate fixed on a bottom of the frame and a magnet attached on the lower plate; a vibration system received in the frame and including a vibrating diaphragm attached to a top of the frame; a cavity formed cooperatively by the lower plate, the frame and the vibrating diaphragm; a leak hole provided between the frame and the lower plate for communicating with outside of the electro-acoustic device; and a damper attached to the lower plate and located inside of the electro-acoustic device for covering the leak hole internally.

Abstract: An electromechanical transducer including a magnetic circuit having a magnet configured to generate a magnetic field and a magnetic gap into which a voice coil associated with a diaphragm is at least partially inserted, the magnetic field having a primary flux component and a secondary flux component. The transducer further including a housing positioned around the magnetic circuit, the housing having an acoustic spout whose sound outlet opening is positioned outside of a portion of the magnetic field that is dominated by the primary flux component. A transducer including an enclosure having a top wall, a bottom wall, at least one side wall connecting the top wall to the bottom wall and an acoustic spout extending from the top wall or the bottom wall, a diaphragm, a voice coil and a magnet assembly having a ring magnet and a gap within which the voice coil is positioned.

Abstract: An audio speaker having a magnetic system that includes a magnetic insert in a recess of a bottom plate, is disclosed. More particularly, embodiments of the magnetic system include a magnetic insert having a higher magnetic saturation level than the bottom plate. Other embodiments are also described and claimed.

Abstract: A moving iron sounding device includes a casing, a diaphragm sounding system, and a magnetic circuit system. The magnetic circuit system includes a dual-rectangle-shaped magnetic circuit, an inductance coil, and an armature. The diaphragm sounding system includes a support ring and a composite diaphragm. The composite diaphragm includes a diaphragm sheet and a metal sheet. One end of the metal sheet is welded to the vibration portion through a connecting arm, and another end of the metal sheet is connected to the support ring. The present invention achieves a stable connection of the diaphragm sounding system and the magnetic circuit system and ensures the quality of the product. During the process of assembly, the adhesive won't be spilled on the diaphragm.

Abstract: Provided is a headphone driver including a yoke that has a bottom surface and an erected surface that is erected in a perpendicular direction with respect to the bottom surface, and that is formed using a magnetic material, and a bonded magnet unit consisting of a bonded magnet that is provided on the bottom surface of the yoke. The magnetic flux of the bonded magnet unit is concentrated on the side surface of the bonded magnet unit facing the erected surface of the yoke.

Abstract: Provided is an energy conversion apparatus including a diaphragm on which a coil of a lead pattern is formed, a magnet substrate configured to generate a magnetic field towards the coil on the diaphragm, and a magnetic film configured to generate magnetic force between the magnetic film and the magnet substrate to support the diaphragm therebetween.

Abstract: An magnetic assembly and an electro-acoustic transducer using the same are disclosed. The magnetic assembly includes a lower plate, a main magnet positioned on a central portion of the lower plate, an auxiliary magnet positioned on a periphery portion of the lower plate, surrounding the main magnet with space, and having an inner surface facing the main magnet and an outer surface opposite to the inner surface, and a first pole plate. The first pole plate includes a base body attached on the auxiliary magnet, and a magnetic conduction member connected with the base body and overlapping the outer surface of the auxiliary magnet for forming a loop of magnetic flux together with the base body and the lower plate as well as the auxiliary magnet.

Abstract: A yoke includes a disk-like base end portion and a columnar center pole protruding from a center portion of the base end portion. An annular magnet is arranged on the base end portion. An annular top plate is arranged on the magnet so that an inner circumferential surface thereof is opposite to an outer circumferential surface of the center pole. A non-magnetic ring member is arranged on an inner circumferential surface side of the magnet, the non-magnetic ring member having a same inner circumferential diameter as an inner circumferential diameter of the top plate.

Abstract: The present invention relates to a plate speaker, and more particularly, to a guide damper intended for a plate speaker and made of a flexible synthetic resin material. The guide damper for a voice coil plate for a plate speaker includes: a coil plate bonding part made of a flexible synthetic resin material and having an integrated structure, wherein the coil plate bonding part has a groove in the lengthwise direction thereof such that the voice coil plate is seated on the central portion thereof; an outer frame having a closed loop shape and adhering to a base frame defining the outer shape of the plate speaker, wherein the outer frame defines the outer shape of the damper; and a damper bridge connecting each of the left and right sides of the coil plate bonding part to the outer frame, wherein the damper bridge provides damping between the coil plate bonding part and the outer frame.

Abstract: A micro-speaker is disclosed. The micro-speaker includes a frame, a magnetic circuit received in the frame, a voice coil partially received in the magnetic circuit, a diaphragm connected to the voice coil, and a contact fixed by the frame for electrically connecting the voice coil to an external circuit. The contact includes a base plate, a first and second connecting plates respectively connected to both ends of the base plate and formed an engaging space by connecting them in order. Corresponding to the contact, the frame includes a sidewall and a protrusion formed on the sidewall. The engaging space receives and engages with the sidewall and the second plating plate engages with the protrusion for mounting the contact on the frame firmly without soldering.

Abstract: A vibration-lead plate for a flat speaker is mounted between a voice coil plate and a vibration plate for increasing vibrational efficiency and removing the lead wire of a voice coil. The vibration-lead plate includes: a coil plate-spline, mounted between a voice coil plate having a voice coil formed in the shape of a spiral track and a vibration plate to vibrate according to the movement of the voice coil plate for generating sound, and formed in the center so as to be adhered to the voice coil plate; an edge-spline, connected to one side of the coil plate-spline and the edge of the vibration plate so as to variably correspond to vibrations; and a vibration plate outside portion, connected to one side of the edge-spline and adhered to the outside portion of the edge of the vibration plate.

Abstract: A loudspeaker includes a motor assembly including a magnet having a first face and a second face, a back plate abutting the magnet first face, a pole piece centrally disposed with respect to the back plate and extending beyond the magnet second face, and a top plate concentrically disposed with respect to the pole piece and extending beyond the magnet second face. A non-magnetic conducting frame is attached to the top plate, a non-magnetic conducting cap is disposed within the motor assembly and encircling the pole piece, a first non-magnetic conducting ring is disposed within the motor assembly and encircling the pole piece, and at least one second non-magnetic conducting ring is disposed within the motor assembly and abutting the back plate.

Abstract: A transducer includes a housing, a magnet unit, an elastic diaphragm, a vibration unit, and a coil. The housing has a first housing and a second housing to form a storing space. The magnet unit is secured in the first housing. The elastic diaphragm is a thin layer and disposed between the second housing and the vibration unit. The spiral coil is mounted on the vibration unit and has two electrical connecting points for inputting electric signal of alternating current. Hence, the coil can generate continuous vibration caused by alternating attraction/repelling force of the magnet unit. When the frequency of the electric signal is within 20˜20000 Hz, the elastic diaphragm generates sound signals within earshot. When it is within 10˜20 Hz, it can generate vibration signals. So, signal unit can produce sound and vibration. In addition, it saves space for effectuating the thickness minimization of a product.

Abstract: An electroacoustic transducing device such as a small speaker or receiver used in a portable telephone or the like. A yoke-integral frame is formed by a simple process, and the number of components and production steps for producing the electroacoustic transducing device are reduced, thereby improving productivity. The transducing device having: a magnetic circuit having a yoke, a magnet, and a pole piece; a vibration system having a diaphragm and a voice coil; and a frame which holds the magnetic circuit and the vibration system. The voice coil is placed in a magnetic gap, and the frame is formed by performing a pressing process on one sheet-like metal material into a bottomed tubular shape, and at least two places of the bottom plate being cut and raised to form a bottom frame-like yoke portion, thereby being formed into a yoke-integral type.

Abstract: A micro-speaker includes a yoke, a magnet assembly attached to the yoke, a voice coil, and a diaphragm connected with the voice coil. The yoke defines a bottom wall, and a number of sidewalls extending upwards from the bottom wall. The magnet assembly includes a main magnet positioned on the bottom wall, and a number of secondary magnets positioned on tops of the sidewalls.

Abstract: A magnetic circuit includes a magnet, a first plate, and a yoke, and has a magnetic gap. The first plate and the yoke are joined to the magnet. The magnet includes first and second magnet parts. The second magnet part has a lower magnetic property than that of the first magnet part. Such a first magnet part is disposed in a vicinity of the magnetic gap. On the other hand, the second magnet part is disposed farther from the magnetic gap than the first magnet part. The first and second magnet parts are connected in parallel to each other. With this configuration, the second magnet part makes a small contribution to the magnetic flux density in the magnetic gap. Therefore, the magnetic property of the second magnet part may be low, and an inexpensive magnet can be used as the second magnet part.

Abstract: Provided is a diaphragm for use in a speaker that is configured to include a nanoweb that is formed by electrospinning a polymer material and accumulating nanofibers, so as to have a plurality of pores through which air can pass. The diaphragm can be made thin, have excellent flexibility, have sufficient strength to endure sound pressure, and enhance sound quality of low pitched bands.