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 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 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 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: 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 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: 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 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: 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: 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.

Abstract: A magnetic circuit for coaxial speaker includes a first magnetic unit, at least one second magnetic unit arranged around the first magnetic unit and at least one third magnetic unit arranged around the at least one second magnetic unit. The magnetic pole arrangement of the second magnetic unit is reversed to the magnetic pole arrangement of the first magnetic unit and the second magnetic unit, enabling a first magnetic loop to be established between the first magnetic unit and the at least one second magnetic unit and a second magnetic loop to be established between the at least one second magnetic unit and the at least one third magnetic unit. The magnetic circuit is practical for use in the inner and outer drivers of a coaxial speaker, providing uniform magnetic field distribution, and facilitating speaker miniaturization.

Abstract: An electromagnetic drive unit for a loudspeaker of the type where an air gap is arranged in a magnet system such that magnetic flux lines are substantially linear across the air gap, and that a voice coil is arranged in said air gap, wherein the magnet system comprises a central yoke separated by said air gap from a ring-shaped magnet system, which magnet system at least comprises a bottom plate connected to said central yoke, and a magnet and a top plate, characterized in that at least a section of the central yoke corresponding to the extent of the air gap and at least a corresponding section of the top plate is made from a soft magnetic composite material.

Abstract: A speaker microphone design that prevents, eliminates, and/or minimizes speaker mechanical failure caused by fine metal particles in the ambient environment. The contemplated invention includes embodiments that utilize one or more barrier cover installed at a location between the speaker diaphragm and the grille. The barrier cover can be a thin shell of various shapes and sizes, such as a dome-shaped structure. In other embodiments, the barrier cover can be a thin membrane, such as a Bayer® film. Additionally or alternatively, the speaker is positioned further back away from the grille, to provide a clearance space of at least 10 mm between the diaphragm and the grille. This novel design of clearance is also effective in preventing, eliminating, and/or minimizing speaker mechanical failure caused by fine metal particles in the environment.

Abstract: A magnetic assembly for a speaker is disclosed. The magnetic assembly includes a yoke, a magnet module installed on the yoke, and a pole module mounted on the magnet module. The magnet module includes a main magnet, a first secondary magnet and a second secondary magnet, the pole module includes a main pole plate, a first secondary pole plate and a second secondary pole plate. The first secondary pole plate includes a first pole protrusion extending perpendicularly from an edge thereof, and the second secondary pole plate includes a second pole protrusion extending perpendicularly from an edge thereof. The first pole protrusion and the second pole protrusion are located facing two opposite side walls of the main magnet respectively.

Abstract: A speaker box is disclosed. The speaker box includes a housing and a speaker unit. The housing includes a bottom, a side connected with the bottom, and a rear volume formed by the side and the bottom, the side including a first side and a second side connecting with the first side. The speaker unit includes a frame, a magnetic circuit unit accommodated in the frame, a vibration unit positioned above the magnetic circuit unit and fixed to the frame, and a front volume. The frame includes a first sidewall abutting against the first side, and a second sidewall connecting with the first sidewall. The first side includes a first mounting portion, the first sidewall includes a second mounting portion engaging with the first mounting portion.

Abstract: A micro-speaker includes a frame, a diaphragm mounted on the frame, a magnetic system received in the frame and defining a magnetic gap, a voice coil driving the diaphragm and suspended in the magnetic gap, and a suspension having a body portion and at least a pair of connecting portion extending from the body portion and mounted on the frame. The body portion of the suspension connects with the voice coil and far away from the diaphragm for cooperating with the diaphragm to fix the coil firmly, thereby ensuring the vibrating of the diaphragm is stable and balanced.

Abstract: A magnetic motor system for driving a loudspeaker voice coil. The system has first and second parts that define a volume for receiving a voice coil. The first and second parts each have a respective permanent magnet with first and second sidewalls that extend in a direction away from the volume. The first sidewall slopes in a direction towards the second sidewall as the sidewalls extend away from the volume. The first and second parts further have respective guide members for channelling lines of magnetic flux in a return path between the permanent magnets.

Abstract: A loudspeaker with double dampers include a magnetic circuit forming a magnetic field, a voice coil passing through the magnetic field of the magnetic circuit, a vibration module connected with the voice coil, a frame connected with the vibration module, and a supporting module having a pillar and first and second dampers. The pillar of the supporting module is arranged inside the voice coil and mounted on the magnetic circuit. The first damper of the supporting module is connected between the pillar and an inner surface of the voice coil, and the second damper is connected between an outer surface of the voice coil and an inner surface of the frame.

Abstract: An electro-acoustic transducer includes a frame, a magnet circuit unit accommodated in the frame, and a vibration unit engaging with the frame. The magnetic circuit unit includes a lower plate, a main magnet positioned centrally on the lower plate, a pair of auxiliary magnets positioned spaced from the main magnet for forming a magnetic gap, and a pair of upper plates attached to the auxiliary magnets, respectively. Each upper plate includes a base body integrated with the frame, and a restricting part extending from the base body and engaging with an inner surface of the auxiliary magnet facing the main magnet.

Abstract: A speaker of the present invention is used for converting audio electrical signals to audible sounds. The multi-magnetic circuit speaker includes a box with a sound hole, at least one magnetic circuit having at least two magnetic gaps, at least two vibrating units corresponding to the magnetic gaps, respectively, at least two pair of pads embedded in the box to electrically connecting with the two vibrating units, a terminal board engaged with the box and pressing on the two pads for conducting electrical signals to the two vibrating units. The terminal board includes a first portion, a second portion extending from the second portion and a third portion extending from the second portion.

Abstract: A microphone includes a polar piece contacting with a first magnetic pole of a first permanent magnet, a yoke body annularly arranged around the polar piece through a magnetic gap G with a predetermined width, a magnetic circuit unit including a tail yoke connected to the yoke body and contacting with a second magnetic pole of the first permanent magnet, and a diaphragm unit provided with a voice coil arranged to vibrate in the magnetic gap. The second magnetic pole of the first permanent magnet contacts with one side of the tail yoke, a first magnetic pole of the second permanent magnet is disposed to contact with other side of the tail yoke, a magnetic path is produced between the second magnetic pole of the second permanent magnet and the yoke body, and the first permanent magnet and the second permanent magnet are polarized in the same sense.

Abstract: A method for operating an acoustic transducer is provided. The acoustic transducer includes a moving element and a fixed element, wherein the moving element is coupled to surrounding air. In the method, a signal-independent magnetic field is generated to urge the moving element into a rest position when no input signal is received; and a force is generated in response to the input signal and applying that force to the moving element to urge the moving element away from the rest position. The moving element is controlled by a combined influence of the signal-independent magnetic field and the signal-dependent force to generate acoustic vibrations in response to an audio input signal.

Abstract: [Problems] To provide a multifunction vibration actuator which has flat rising and falling frequency characteristic at the time of generation of bodily sensation vibration and which is stable for an input signal. [Means for Solving Problems] Flat frequency characteristics can be obtained by using a two-fold rotational symmetry frame type suspension, and miniaturization of the whole multifunction vibration actuator can be made by the user of the frame type suspension. With regard to the frame type suspension, use of protruded configuration of corner parts ensures the effect of absorption of deflection of the suspension.

Abstract: A speaker with a built-in filter used for a digital amplifier is provided. The speaker with the built-in filter includes an inductor wound on an outer circumferential surface of a pillar passing through a magnet. The speaker in accordance with the present invention may be directly connected to the digital amplifier without an additional low pass filter interposed therebetween, enabling a smaller and lighter digital amplifier.

Abstract: A thin speaker structure comprises: a long support frame; a magnetic circuit member; a voice coil; a membrane; wherein the magnetic circuit member and voice coil are rounded and the membrane includes an elliptic surrounding and an elliptic body with a center portion and a peripheral portion; the peripheral portion is fixed to a bottom edge of an inner surface of the surrounding and the center portion corresponding to the peripheral portion defines a rigid strengthened region in a longer elliptic shape; the center portion has a length of a long side longer than a diameter of the voice coil at a predetermined distance; whereby the elliptic body is combined with the circular voice coil to form a vibrating structure in order to increase the rigidity of the membrane.

Abstract: An audio resonance vibrator includes a yoke defining a bottom and a sidewall extending vertically from the bottom, an elastic frame cooperatively with the yoke forming a housing defining a receiving space, a magnet disposed on the bottom of the yoke cooperatively with the sidewall of yoke forming a magnetic gap, a vibrating unit accommodated in the receiving space defining a vibrating plate and a coil assembly connected with the vibrating plate. The coil assembly is at least partially received in the magnetic gap, and the vibrating plate is positioned on the elastic frame. The audio resonance vibrator further includes an elastic member interposed between the magnet and the vibrating plate to support the magnet.

Abstract: An electronic apparatus includes a configured to output audio using a permanent magnet, an audio processor configured to process audio data and output to the speaker, and an electromagnet configured to push the permanent magnet and project the speaker out on the electronic apparatus, with application of electric current.

Abstract: An electro-acoustic transducer includes a frame with an accommodating space defined therein and an opening opened in a top surface thereof, at least one driving unit equipped in the accommodating space of the frame, a diaphragm movably mounted at the opening of the frame, at least one fulcrum settled in the accommodating space of the frame, and at least one lever placed next to the fulcrum to contact with and use the fulcrum as rotation center thereof. The lever connects with the driving unit and the diaphragm at two ends thereof and transmits vibration wave from the driving unit to the diaphragm. The lever has a longer length from the fulcrum to the diaphragm than from the fulcrum to the driving unit for increasing the vibration stroke of the diaphragm during transmitting the vibration wave.

Abstract: An electronic device having an enclosure having a top panel and a bottom panel. An electromagnet is mounted within the enclosure, the electromagnet having a core portion attached to the top panel and a coil connected to the core portion. An attractor plate is attached to the bottom panel, the attractor plate forming part of a magnetic circuit of the electromagnet such that when an electrical audio signal is applied to the electromagnet, the bottom panel vibrates and produces a sound. A permanent magnet is further attached to the core portion, the permanent magnet is configured to create a bias in the magnetic circuit so as to modify a distortion in the sound.

Abstract: An improved electrodynamic acoustic transducer eliminates or reduces the need for flexible or elastic materials to suspend an internal magnetic element by using both static and dynamic signal-dependent magnetic fields to control its movement. In one implementation, the transducer has a magnet that moves within a surrounding tube. This tube in turn supports one or more electromagnetic coils that generate a dynamic signal-dependent magnetic field that causes the internal magnetic element to vibrate. The surrounding tube also supports one or more magnets whose location on the tube is fixed and whose magnetic fields provide appropriate restoring forces acting on the internal magnetic element. These fixed magnets may be replaced or supplemented by ferromagnetic materials.

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: A miniature electroacoustic transducer includes: a metal shell, having the shape of a barrel with one open end; a vibrating system, including a vibrating diaphragm and a voice coil; and a magnetic circuit system, including a concentrating flux plate, a magnet and a magnetic yoke that are sequentially combined together. The magnetic circuit system is formed with a magnetic gap corresponding to the voice coil; the vibrating system and the magnetic circuit system are fixedly installed in the barrel-shaped shell; the components in the structure are further modularized, maximizing the magnet under the same product dimension and effectively improving the product sensitivity. An assembling method of the electroacoustic transducer includes: a. providing a barrel-shaped metal shell with one open end; b. putting a pre-assembled vibrating system into the shell; c. putting a pre-assembled magnetic circuit system into the shell; and d. fixedly assembling the shell with the magnetic yoke.