Abstract: The present disclosure provides a sound generating unit, a sound generating module and electronic terminal, comprising a magnetic circuit system, a vibration system, and a circuit board. The voice coil is jointly wound by two voice coil wires, and the two end portions of each voice coil wire respectively form a wire-in end and a wire-out end; the lead-out positions of the two wire-in ends are located on one side of the voice coil, and the lead-out positions of the two wire-out ends are located on the other side of the voice coil; the two wire-in ends and the two wire-out ends are electrically connected to the corresponding pads of the circuit board respectively, and the internal circuit of the circuit board is configured to electrically connect the two wire-in ends together, and electrically connect the two wire-out ends together.

Abstract: A speaker including a frame; a magnetic circuit system fixed to the frame, comprises a plurality of magnetic circuit devices connected to each with a magnetic gap; a vibration system driven by the magnetic to vibrator, comprises a diaphragm fixed to the frame and a plurality of voice coil assembly inserted into the magnetic gap drive the diaphragm vibrate jointly. the speaker can drive the diaphragm to vibrate and produce sound with a greater driving force, and the magnetic circuit system has a higher magnetic field. The efficiency makes the speaker have a better sound effect.

Abstract: A sampling rate processing method performed by a computer device are disclosed. The method includes: obtaining a first audio signal recorded by a transmitting device, the first audio signal being recorded according to an initial sampling rate of the transmitting device; obtaining a second audio signal recorded by a receiving device during playing of the first audio signal, the second audio signal being recorded according to the initial sampling rate; determining a frequency response gain value of the receiving device according to a power spectrum of the first audio signal and a power spectrum of the second audio signal; determining a target sampling rate of the transmitting device according to the initial sampling rate and the frequency response gain value; and configuring the transmitting device to record audio signals according to the target sampling rate.

Abstract: A speaker system includes a speaker, a processor, and an active noise cancellation (ANC) circuit communicatively coupled with the processor. The ANC is configured to apply ANC on audio signals from outside the speaker system to generate a modified audio signal stream through the speaker. The application of ANC is to include generation of ANC signals to interfere with at least part of the audio signals from outside the speaker system in the modified audio signal stream. The processor is configured to determine of low-frequency energy at the speaker system, the low-frequency energy below a threshold frequency. The ANC circuit is configured to, based on the determination of low-frequency energy at the speaker system, perform a corrective action on application of ANC to the audio signals from outside the speaker system.

Abstract: A vibration apparatus includes a substrate, an elastic piece, a magnetic component and at least two coils. The substrate abuts on a display panel of a mobile terminal; the at least two cods are fixed on an inner side surface of the substrate; the inner side surface faces away from the display panel; the at least two coils are disposed coaxially; and axes of the at least two coils are perpendicular to the substrate. A first side surface of the elastic piece abuts on the inner side surface of the substrate; the magnetic component is connected to a second side surface of the elastic piece; the second side surface is disposed away from the first side surface. The at least two cods are at least in part accommodated in an annular accommodating groove of the magnetic component.

Abstract: A loudspeaker comprising two acoustic diaphragms mounted to face in axially-opposed directions, two voice coils each having an axis and an axial length and being configured to reciprocate along its axis to drive one of the diaphragms, the axes being substantially parallel and both axes passing through both diaphragms, and at least one magnet forming part of a chassis assembly configured to provide two axially-extending gaps, one for each of the voice coils to reciprocate within, wherein the at least one magnet and the chassis assembly are adapted so that magnetic flux flows across the gaps in opposite directions, and wherein when in use the diaphragms are at their predetermined maximum negative excursions the voice coils overlap in the axial direction by between 10% and 90% of their average axial length, and wherein when in use the diaphragms are in a relaxed position, between their maximum negative and positive excursions, the voice coils do not overlap in the axial direction.

Abstract: An electrodynamic acoustic transducer, is disclosed, which comprises a frame and/or a housing, a membrane, at least one coil and a magnet system. The coil in a cross sectional view with a coil axis being part of the sectional plane comprises a plurality of conductive layers formed by an electrical conductor of the coil. The electrical conductor has a rectangular cross section in said cross sectional view, wherein a longer side of the rectangular cross section is substantially perpendicular to the loop axis. Furthermore, a method for manufacturing an electrodynamic acoustic transducer of the proposed kind is disclosed. According to this method, a stack of conductive layers is made from the electrical conductor by stacking of separate pieces of the electrical conductor and electrically connecting the stacked separate pieces and/or by folding of the electrical conductor.

Abstract: A voice coil for use with a loudspeaker. The voice coil includes a bobbin that has a first layer of a non-conductive material infused with a high-temperature adhesive, a second layer of a non-conductive material infused with a high-temperature adhesive, and a layer of thermally-conductive material located in between the first layer of a non-conductive material and the second layer of a non-conductive substance, and a conductive wire wrapped around the bobbin.

Abstract: A method for driving a voice coil of a loudspeaker may include providing a magnetic circuit having an air gap, providing a voice coil suspended in the air gap, and applying an audio signal to the voice coil to move it along a travelling axis. The voice coil comprises a main voice coil section, and a pair of auxiliary voice coil sections arranged along the travelling axis with auxiliary voice coil sections arranged respectively on either side of the main voice coil section. Applying an audio signal comprises continuously coupling a main driving signal based on the audio signal to the main voice coil and selectively coupling an auxiliary driving signal based on the audio signal to the pair of auxiliary voice coil sections. The disclosed embodiments further relate to a voice coil driving system and a loudspeaker comprising a voice coil driving system.

Abstract: A speaker device that includes: two magnetic circuits arranged side by side and each including a magnetic gap; two voice coil bodies each corresponding to a shape of the magnetic gap and arranged in the magnetic gap in an inserted state; a diaphragm to which the two voice coil bodies are coupled, the diaphragm having a width shorter than a length in a direction in which the two magnetic circuits are arranged; and a frame to which the diaphragm and the two magnetic circuits are attached. In the speaker device, the two voice coil bodies include two coils connected in series, the two coils being connected to a pair of input terminals for receiving an input of an electric signal, the pair of input terminals being disposed between the two voice coil bodies.

Abstract: The invention discloses a sound generator having a voice coil. The most outer layer of the voice coil is defined as a tailend layer (last layer), which is wound obliquely from a top of the penult layer adjacent to the diaphragm in a direction away from the diaphragm, so that the high frequency pit of the sound generator is improved. The most outer layer of the voice coil is not completely wound such that the most outer layer reduces the contacting area between the dome and the voice coil, which reduces the split vibration of the dome at high frequency and improves the high frequency-resonance performance.

Abstract: Embodiments are disclosed of a speaker containing multiple diaphragms and multiple voice coils. Each diaphragm is driven by its own voice coil plate, and at least two of the voice coil plates share at least one or more parts of a permanent magnet pair. In some embodiments, the speaker generates bi-directional sound. Optionally, the multiple diaphragms are of varying sizes, such that the diaphragms are configured to transmit different frequency ranges.

Abstract: Disclosed are numerous embodiments of speakers of non-conventional shape. In one set of embodiments, each speaker comprises a pair of curved magnets and a curved voice coil plate located between the magnets and parallel to the magnets. In another set of embodiments, each speaker comprises two or more segments attached at an angle to one another, where each segment comprises a pair of bar magnets and a voice coil plate located between the magnets. Optionally, the magnets and voice coil plate can be curved or angled in a third-dimension as well. The embodiments allow for a speaker to be built of almost any shape.

Abstract: A speaker device includes: a diaphragm; a coil directly or indirectly attached to the diaphragm; a yoke having a notch on a bottom surface thereof; a frame to which the coil and the yoke are attached; and a first terminal provided on the frame and electrically connected to the coil. The first terminal is provided at a position corresponding to the notch of the yoke.

Abstract: A planar dynamic sound transducer includes a magnet arrangement which for example comprises bar magnets and a fixing frame, and a diaphragm arrangement. The diaphragm arrangement has a tensioned diaphragm film (diaphragm for short), a tensioning device for the diaphragm, and a conductor structure applied to the diaphragm. When the conductor structure is conventionally provided with electrical connections mechanically sensitive connections and/or high transfer resistances often occur. An improved diaphragm arrangement for a planar dynamic sound transducer includes a support frame having at least one contacting surface, and a diaphragm tensioned on the support frame, and which at least one electrically conductive conductor track is applied by coating. At least one end of the conductor track applied by coating extends on to the contacting surface of the support frame. The connecting line can be connected to the contacting surface of the support frame by way of a solder join.

Abstract: An array type magnetic circuit system includes a T yoke, magnetic steels and a washer. The T yoke includes a bottom plate, and more than two central columns located on the bottom plate and distributed in an array. The magnetic steels are respectively disposed at two sides of each of the central columns and provide a magnetic energy for the magnetic circuit system. Hole positions coupled with the central columns correspondingly are formed on the washer and the washer is tightly connected to the T yoke. According to the array type magnetic circuit system, under a condition in which a plurality of magnetic circuits are combined, the T yoke and the washer are respectively taken as a component, so that the precision of a product can be controlled better.

Abstract: Provided is a speaker, including a holder, a vibration unit and a magnetic circuit unit fixedly held at the holder, and a bayonet portion penetrating through the holder. The vibration unit includes a diaphragm, a voice coil located at a side of the diaphragm and driving the diaphragm to vibrate and emit sound, and a flexible printed circuit board located at a side of the voice coil facing away from the diaphragm and connected to the voice coil. The flexible printed circuit board includes a body portion supporting the voice coil, an extension portion extending from body portion towards bayonet portion and passing through the bayonet portion, and a connecting portion bent and extending from a distal end of the extension portion along an outer side of the holder. The connecting portion is fitted to outer side of holder and used for electrical connection with an external circuit.

Abstract: The invention provides a symmetrical dual-edge loudspeaker, comprising a frame and a cone paper, a U-shaped magnet and a voice coil mounted in the frame, wherein an accommodation chamber is formed in the middle of the U-shaped magnet; the voice coil is located in the accommodation chamber; the cone paper comprises a body and an upper edge and a lower edge bonded to the upper and lower sides of the body; the upper edge and the lower edge respectively protrude upwards and downwards, forming a symmetrical structure; the cone paper is fixedly connected to the frame via the upper edge and the lower edge; and the lower edge is provided with an air discharge hole. The invention effectively ensures steady up and down motion of the cone paper by disposing up-down symmetrical upper and lower edges, and enables a stiffness coefficient Kms to achieve optimal symmetry, thus satisfying an application requirement for an ultra-thin loudspeaker.

Abstract: A speaker device includes a voice coil; a pair of lead wires configured to be pulled out of the voice coil; a vibrating body connecting to the voice coil; and a magnetic circuit including a yoke. The yoke includes a frame that supports the vibrating body, the pair of lead wires is configured to pass through a space that is located between the frame and the vibrating body, the pair of lead wires is configured to pass above a cutout of the yoke and bend towards and through the space, and the pair of lead wires is configured to be substantially symmetrical with respect to the center of the voice coil.

Abstract: Magnetic field cancelling audio speakers and associated devices are disclosed. In one embodiment, a utility locator includes an audio speaker device with two loudspeaker drivers positioned and electrically connected to reduce emitted magnetic fields over a range of frequencies corresponding with locator sensing frequencies.

Abstract: A linear motor includes a housing with an accommodation space; a magnet assembly accommodated in the accommodation space, the magnet assembly including a main magnet unit and two auxiliary magnet units located on both sides of the main magnet unit for forming a magnetic gap; a vibration member accommodated in the accommodation space, the vibration member including a coil inserted into the magnetic gap and weights located at both sides of the coil; and a support member suspending the vibration member in the accommodation space, the support member including an elastic supporting member supporting the vibration member and a coil frame inserted into the magnetic gap. The coil frame is disposed between the coil and the auxiliary magnet units, and the coil is wound around a side surface of the coil frame opposite to the main magnet unit.

Abstract: A multilayer voice coil plate and a flat speaker including the same are capable of significantly reducing difficulties in designing and manufacturing a multilayer voice coil pattern. The multilayer voice coil plate may include: a first-type voice coil pattern layer formed in the shape of a track and connected from a first outer via hole outside the track to an inner via hole disposed in the track; and a second-type voice coil pattern layer formed in the shape of a track and connected from a second outer via hole outside the track to an inner via hole disposed in the track. The plurality of first-type voice coil pattern layers and the plurality of second-type voice coil pattern layers may be stacked so as to be insulated from each other, and the first outer via holes, the second outer via holes and the inner via holes may be electrically connected through interlayer conductors, respectively.

Abstract: A speaker module is disclosed, which comprises an inner cavity defined by a shell, and a magnetic circuit system and a vibrating system arranged inside the inner cavity, wherein the vibrating system comprises a vibrating diaphragm fixed in the inner cavity, a voice coil is fixed to a lower end of the vibrating diaphragm, a first induction coil is provided to an upper end of the vibrating diaphragm, the voice coil is electrically connected with the first induction coil via its down-lead, and a second induction coil is provided above the first induction coil for electrically connecting a terminal device. When the speaker module operates, the terminal device conducts a current signal of an external audio to the second induction coil, so that the second induction coil generates a magnetic field which changes along with the change of the audio signal current.

Abstract: A loudspeaker is disclosed. The loudspeaker includes a diaphragm with a fixed portion and a movable portion. The fixed portion is attached to the movable portion by a plurality of leaf springs. A coil is disposed over the diaphragm in the movable portion of the diaphragm. A magnet assembly is operatively disposed relative to the coil, wherein upon flow of current through the coil, the movable portion of the diaphragm moves relative to the fixed portion.

Abstract: A miniature speaker includes a frame having a base plate, a cover plate covering the frame and forming an accommodating space; a vibrating system fixed on the frame; and a magnetic circuit system for driving the vibrating system to vibrate. The magnetic circuit system includes a main magnet, a first pole plate attached to the main magnet, and two first side magnet components. Each of the first side magnet components includes a first side magnet, a second pole plate and a second side magnet stacked sequentially from the base plate along a direction toward the cover plate. A magnetizing direction of the first side magnet is opposite to that of the main magnet, and a magnetizing direction of the second side magnet is opposite to that of the first side magnet.

Abstract: This approaching vehicle notification sound speaker device is equipped with a voice coil for conducting an electrical signal, a cylindrical voice coil bobbin on which the voice coil is wound, an insulating sheet, and a cap. The sheet is wound on the voice coil bobbin at a position closer to the sound-emitting side than the voice coil, the cap is disposed closer to the sound-emitting side than the voice coil bobbin, the voice coil bobbin and the cap are made of an aluminum-containing material, and the sheet is formed with the inclusion of an aramid-based nonwoven fabric.

Abstract: A long stroke speaker is provided in the present disclosure. The long stroke speaker includes a shell having a receiving space, a first vibration system and a second vibration system connected with the shell respectively, and at least one magnetic circuit system. The receiving space comprises a first acoustic cavity and a second acoustic cavity communicated with each other. The magnetic circuit system(s) is(are) disposed in the first acoustic cavity and/or the second acoustic cavity. The vibration direction of the first vibration system intersects with the vibration direction of the second vibration system.

Abstract: A coaxial speaker includes a frame, a magnetic steel component, a magnetic component, a magnetic conductive component, a first cover, a first speaker assembly, and a second speaker assembly. The magnetic steel component, the magnetic component, and the magnetic conductive component are disposed inside the frame sequentially. A first accommodating space is formed among the magnetic component, the magnetic conductive component, and the magnetic steel component. A second accommodating space is formed among the magnetic component, the magnetic conductive component, the magnetic steel component, and the frame. The first speaker assembly is fixed between the first cover and the frame and is disposed in the first accommodating space for producing low and middle audio frequencies. The second speaker assembly is fixed on the first cover and disposed in the second accommodating space for producing high audio frequencies. In such a way, the coaxial speaker has enhanced sound quality.

Abstract: A loudspeaker includes a sound transducer, a housing and a unit configured to influence the temperature, such as a pressure compensation element. The sound transducer includes a membrane, the membrane enclosing a gas volume along with the housing. The sound transducer is configured to cause the membrane to vibrate, so that the gas volume is changed in accordance with the vibration. The unit configured to influence the temperature is configured to counteract a change of state, which is due to the membrane vibration, by means of a change in temperature of the gas volume.

Abstract: A transducer including a driven element and a magnet assembly. The magnet assembly is coupled to the driven element and includes a first, second and third magnet. Each of the magnets have a first and second magnetic pole. The first magnetic pole of the first magnet and the first magnetic pole of the second magnet being proximate to each other and facing each other thereby defining a magnetic zone therebetween. The second magnetic pole of the third magnet being magnetically proximate to said magnetic zone. The first magnetic poles all having the same polarity, and the second magnetic poles all having the same polarity.

Abstract: The present disclosure provides an electromagnetic speaker including a frame having an elongated axis, a magnet assembly received in the frame, an elastic plate perpendicular to the elongated axis for suspending the magnet assembly in the frame, a voice coil surrounding and keeping a distance from the magnet assembly, and a diaphragm driven by the magnet assembly. When the electromagnetic speaker is mounted in a mobile phone, the diaphragm vibrates along a direction parallel to the screen, and the amplitude thereof will not be affected by the height of the mobile phone. In addition, the amplitude of the diaphragm at low frequency is greater than a normal speaker.

Abstract: The present invention discloses a high-efficiency low-voltage-power-supply high-power-output audio driver architecture, including: a multi-coil loudspeaker; and a single-input N-output audio power amplifier configured to amplify a received digital audio signal and to output N switch signals for driving the multi-coil loudspeaker, wherein N represents the number of output channels and is a positive integer greater than or equal to 2. By implementing the above mentioned method, the requirement of the high power output under low voltage input is met; the solution improves the output power by means of combination of coils, and, in cooperation with the unique dynamic power allocation technology, the solution achieves the power balance of the multiple coils, so that the output efficiency of the audio driver is greatly improved.

Abstract: Aspects of the disclosure pertain to a system and method for providing temperature limiting for a voice coil of a speaker. The system and method provide the aforementioned temperature limiting based upon monitoring (e.g., measurement) of an amplifier output signal provided to the speaker. Providing the aforementioned temperature limiting promotes improved protection for the speaker.

Abstract: In one embodiment, a speaker device assembly includes a first voice coil assembly moveable along an axis of a magnetic field of a magnetic core responsive to an induced current to facilitate pressure variations in a medium, and cause recoil vibration on a speaker device assembly structure. The speaker device assembly further includes a second voice coil assembly having a counter balance mass that accounts for at least a mass of the first voice coil assembly, and moveable along the axis of the magnetic field in a direction opposite the first voice coil assembly to attenuate the recoil vibration on the speaker device assembly structure, when the first voice coil assembly moves along the axis of the magnetic field.

Abstract: An intrinsically safe audio circuit and intrinsically safe portable two-way radio device meet conventional audio output requirements and intrinsically safe design limitations by separating the speaker coil of the device's speaker into separate coils to limit the energy storage possible in any one of the coils. Each separate coil is driven by one of several different audio power amplifiers that each output a substantially identical signal, and each of which are current limited.

Abstract: A miniature speaker includes a frame having a sidewall including a first upper thinner portion and a first lower thicker portion, a magnetic circuit unit, a voice coil having a lead wire, and a diaphragm driven by the voice coil. The magnetic circuit unit has a yoke, a magnet mounted on the yoke, a pole plate attached to the magnet, and a magnetic gap. The yoke further includes a lower plate and a side extending from the lower plate, the side including a second thinner portion and a second lower thicker portion. A recess is accordingly formed by the thinner portions and the thicker portions for accommodating the lead wire of the voice coil. The recess defines a bottom formed by the thicker portions and an opening formed by the thinner portions thereby providing an enlarged space to the lead wire.

Abstract: A micro-speaker is disclosed. The micro-speaker includes a frame, a magnetic circuit unit in the frame, a diaphragm, and a voice coil connected to the diaphragm. The frame includes a plurality of blocks for positioning the magnetic circuit unit. The voice coil includes a pair of lead wires. The block has an upper surface, a side surface and a bottom surface treated by laser direct structuring process for electrically connecting to the lead wires of the voice coil.

Abstract: A vibrating film 47 is supported by a cylindrical body frame 31, and a first driving unit 61 for driving the vibrating film 47 based on an applied voice signal, is disposed in the body frame 31 on one surface side of the vibrating film 47, and a second driving unit 75 for driving the vibrating film 47 in the same direction as a vibrating direction of the vibrating film 47 driven by the first driving unit 61 based on the applied voice signal, is disposed in the body frame 31 on the other surface side of the vibrating film 47.

Abstract: The invention provides a multi-coil unit including first, second, . . . , (n?1)-th, and n-th coil elements corresponding to a number n of quantization bits of a digital signal, the coil elements including coil wires of a same length. The multi-coil unit has a winding structure in which the coil wires are wound a plurality of times to be stacked in a magnetic flux direction to form a plurality of tires.

Abstract: Loudspeaker drivers are provided. According to one embodiment, a loudspeaker driver comprises a diaphragm, a connection tube, first and second voice coils, and first and second magnet assemblies. The connection tube has a first end section, a second end section, and a middle section. The first voice coil is connected to and surrounds at least a portion of the first end section. The second voice coil is connected to and surrounds at least a portion of the second end section. The first magnet assembly is configured to suspend the first voice coil in a first magnetic field and the second magnet assembly is configured to suspend the second voice coil in a second magnetic field. The connection tube intersects the diaphragm and the middle section of the connection tube is connected to the diaphragm.

Abstract: A speaker assembly includes an enclosure having an acoustic chamber and an acoustic output opening and a speaker driver. The speaker driver includes a sound radiating surface and a first voice coil and a second voice coil positioned along opposite faces, respectively, of the sound radiating surface. The speaker driver further includes a first magnet assembly including an elongated gap in which part of the first voice coil is positioned to vibrate and a second magnet assembly having an elongated gap in which part of the second voice coil is positioned to vibrate. The first magnet assembly elongated gap is orientated lengthwise toward the acoustic chamber, and the second magnet assembly elongated gap is oriented lengthwise toward the acoustic output opening. Other embodiments are also described and claimed.

Abstract: A speaker includes a holder forming a hollow space, a magnetic system received into the hollow space and defining a magnetic gap, an elastic plate assembled with the holder and defining a first surface and a second surface opposite to the first surface, a diaphragm defining a dome part connected with the first surface of the elastic plate and an edge part connected with the second surface of the elastic plate, and at least a coil defining an end suspended in the magnetic gap and an another end connected with the dome part. The edge part defines an arcuate portion depressed toward the magnetic system.

Abstract: This invention concerns a loudspeaker driver includes at least one actuator connected to a vibrating support to impart excitation to the latter when caused to move, wherein the loudspeaker driver further includes a plurality of sensing members arranged to move with the at least one actuator, each sensing member providing output sensing data dependent on the velocity of said at least one actuator, and means for determining the position of the at least one actuator based on at least one ratio (X/Y) of output sensing data or of linear combinations of output sensing data provided from the plurality of sensing members, said at least one ratio being independent of the velocity of the at least one actuator.

Abstract: A dual coil transducer is provided that has a low profile construction. The transducer includes a voice coil disposed around a central region of the transducer, a diaphragm with flexible suspension extending generally outwardly from the central region and including an inner edge attached to the voice coil, where the diaphragm includes a concave surface, and at least one magnet assembly disposed forward of the concave surface, where the at least one magnet assembly defines at least two magnetic gaps disposed about the central region. The transducer will usually be mounted with the motor outside of the loudspeaker enclosure for best heat dissipation.

Abstract: Embodiments are disclosed for driving an electromagnetic transducer via a drive unit comprising stationary coils and a moving magnet. In some embodiments, an electromagnetic transducer comprises a diaphragm configured to generate acoustic vibrations, a moving magnet affixed to the diaphragm, and a pair of fixed coils surrounding the moving magnet, the fixed coils configured to direct electrical current in opposite directions.

Abstract: Coaxial transducers, some of which include a first assembly and assembly, each of which includes a magnet and a coil.

Abstract: A dual coil loudspeaker system having a voice coil having a first coil configured to receive a first electrical signal from a first source, and a second coil configured to receive a second electrical signal from a second source different from the first source; a field magnet configured to generate a magnetic field that interacts with magnetic fields created by the first coil and the second coil; and a diaphragm connected to the voice coil such that the diaphragm is displaced in response to energization of at least one of the first coil and the second coil.

Abstract: A system and method are provided for creating a loudspeaker system with low failure rate of sound production. The system uses a loudspeaker with more than one voice coil, a circuit to detect breakage of a voice coil and a switching circuit to steer the system input signal to a remaining good voice coil.

Abstract: A dual coil loudspeaker system having a voice coil having a first coil configured to receive a first electrical signal from a first source, and a second coil configured to receive a second electrical signal from a second source different from the first source; a field magnet configured to generate a magnetic field that interacts with magnetic fields created by the first coil and the second coil; and a diaphragm connected to the voice coil such that the diaphragm is displaced in response to energization of at least one of the first coil and the second coil.

Abstract: The present invention relates to a flat-panel speaker, and more particularly, to a flat-panel speaker having a multilayer PCB pattern voice coil film, which enables induced electromotive force to be increased by controlling the impedance of the multilayer voice coil film. The flat panel speaker having the multilayer PCB pattern voice coil film according to the present invention is characterized in that the voice coil comprises: a PCB (printed circuit board) pattern printed thereon and voice coil films stacked in an even number of 4 layers or more. Two layers each of said voice coil films are mutually connected in series, and the serially-connected voice coil films are connected to each other in parallel.