CN113810832A - Micro loudspeaker - Google Patents

Abstract

The invention discloses a micro loudspeaker, which comprises a body, a movable magnet capable of generating an alternating magnetic field and a fixed magnet capable of generating a magnetic field, wherein the movable magnet is arranged on the body; the machine body comprises a base and a resonance sheet, the base is provided with a mounting cavity, the mounting cavity is provided with at least one resonance sheet mounting hole, each resonance sheet mounting hole is provided with a resonance sheet capable of vibrating, and the resonance sheet is matched with at least one movable magnet; at least one fixed magnet is matched in the mounting cavity. The invention replaces the existing coil formed by winding the metal wire by adopting the semiconductor coil chip, so that the micro-speaker has the advantage of small volume.

Description

Micro loudspeaker

Technical Field

The invention relates to a loudspeaker, in particular to a micro loudspeaker.

Background

The existing speaker generally drives the vibration plate of the speaker to vibrate through the interaction between the coil and the magnet, wherein the vibration plate may be a vibration film or a resonance plate, the vibration film may vibrate air to generate sound, and the resonance plate may drive a resonance medium in contact with the vibration film to generate resonance to generate sound.

In present speaker, the coil of speaker adopts the metal silk thread winding to form, and the volume is great, and the volume and the weight of magnet are also great, and coil and magnet can occupy the great spatial position of speaker like this for the volume of speaker is great, leads to the use of speaker in hand-held type electron device and ultra-thin electron device to receive certain restriction. Therefore, how to provide a miniaturized micro-speaker to meet the requirement of ultra-thinning or miniaturization of the applied electronic device becomes a problem to be solved.

Disclosure of Invention

The invention aims to provide a miniature loudspeaker with small volume.

In order to achieve the above purpose, the solution of the invention is:

a micro-speaker comprises a body, a movable magnet capable of generating an alternating magnetic field under the action of an alternating electric signal and a fixed magnet capable of generating a magnetic field; the machine body comprises a base and a resonance sheet, the base is provided with a mounting cavity, the mounting cavity is provided with at least one resonance sheet mounting hole, each resonance sheet mounting hole is provided with a resonance sheet capable of vibrating, and the resonance sheet is matched with at least one movable magnet; at least one fixed magnet is matched in the mounting cavity; the movable magnet is a semiconductor coil chip manufactured by adopting a semiconductor process, and the fixed magnet is a magnet or a semiconductor coil chip manufactured by adopting the semiconductor process.

The mounting cavity of the machine body is provided with at least two resonance piece mounting ports, and the movable magnets matched on the resonance pieces are connected in series or in parallel.

The number of the fixed magnets matched with the installation cavity is the same as that of the resonance sheets, and the fixed magnets and the resonance sheets are arranged in a one-to-one opposite mode.

The resonance sheet is made of a magnetic conductive material with magnetic conductivity.

The resonance sheet is connected with the movable magnet through a magnetic conductive sheet with magnetic conductivity.

The base is made of a magnetic conductive material with magnetic conductivity.

The machine body also comprises a vibrating diaphragm; the mounting cavity of base still has at least one vibrating diaphragm installing port, and a vibrating diaphragm is installed to every vibrating diaphragm installing port, just the vibrating diaphragm cooperation has at least one movable magnet.

The machine body also comprises a vibrating diaphragm; the base of base member still is equipped with at least one assembly chamber, and every assembly chamber has at least one vibrating diaphragm assembly orifice, and a vibrating diaphragm is installed to the vibrating diaphragm assembly orifice of every assembly chamber, the vibrating diaphragm cooperation has at least one movable magnet, and every assembly chamber in the cooperation have fixed magnet.

The semiconductor coil chip is matched with a magnetizer with magnetic permeability.

The semiconductor coil chip comprises at least one coil layer, and at least one coiled coil body is etched on the coil layer; when the number of the coil bodies on the coil layer is more than two, the coil bodies of the coil layer are connected in series and/or in parallel; when the semiconductor coil chip includes at least two coil layers, the coil bodies of the coil layers are connected in series and/or in parallel.

The semiconductor coil chip comprises at least one coil layer, at least one coil body is arranged on the coil layer, the coil body comprises a plurality of metal wire sections etched on the coil layer and distributed in a spiral shape, two ends of each metal wire section of the coil body are divided into a starting end and an ending end along the spiral direction of the coil body, the starting ends of the metal wire sections of the coil body are connected in parallel, and the ending ends of the metal wire sections of the coil body are connected in parallel.

The semiconductor coil chip also comprises an electrode layer, wherein the electrode layer is provided with a first electrode region and a second electrode region, the first electrode region is electrically connected with the initial end of each metal wire section of the coil body of the coil layer, and the second electrode region is electrically connected with the tail end of each metal wire section of the coil body of the coil layer.

The first electrode area of the electrode layer is respectively connected with the starting end of each metal wire section of the coil body of the coil layer through a plurality of first metal wires; the second electrode area of the electrode layer is respectively connected with the tail end of each metal wire section of the coil body of the coil layer through a plurality of second metal wires.

After the scheme is adopted, the movable magnet is the semiconductor coil chip manufactured by adopting a semiconductor process, and the semiconductor coil chip is formed by etching by adopting a semiconductor technology, so that the line pitch of a coil body in the semiconductor coil chip is extremely small, and compared with the conventional coil formed by winding a metal wire, a finished product of the semiconductor coil chip has the advantages of small volume and light weight; therefore, the movable magnet of the invention adopts the semiconductor coil chip, so that the volume of the micro-speaker of the invention can be small.

Drawings

FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;

FIG. 2 is a schematic structural diagram according to a second embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a third embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a fourth embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a fifth embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a sixth embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a first embodiment of a semiconductor coil chip according to the present invention;

FIG. 8 is a schematic structural diagram of a second embodiment of a semiconductor coil chip according to the present invention;

FIG. 9 is a schematic view showing the connection between an electrode layer and a coil layer of a second embodiment of a semiconductor coil chip according to the present invention;

description of reference numerals:

a machine body 1, a base 11, a mounting cavity 111, a resonator mounting port 1111, a fixing frame 1112, a diaphragm mounting port 1113, a mounting cavity 112, a diaphragm mounting port 1121,

the resonance plate 12 is provided with a resonance plate,

the diaphragm 13 is provided with a diaphragm,

the magnetic flux density of the movable magnet 2, the fixed magnet 3,

the coil comprises a semiconductor coil chip A, a coil layer A1, a coil body A11, a metal wire segment A111, a starting end A1111, a tail end A1112, a magnetizer A2, an electrode layer A3, a first electrode area A31, a first metal wire A311, a second electrode area A32 and a second metal wire A321.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.

As shown in fig. 1 to 9, the present invention discloses a micro-speaker, which includes a body 1, a movable magnet 2 capable of generating an alternating magnetic field under the action of an alternating electrical signal, and a fixed magnet 3 capable of generating a magnetic field; the machine body 1 comprises a base 11 and a resonator plate 12, wherein the base 11 is provided with a mounting cavity 111, the mounting cavity 111 is provided with at least one resonator plate mounting opening 1111, and each resonator plate mounting opening 1111 is provided with a resonator plate 12 capable of vibrating; the resonance piece 12 is fitted with at least one movable magnet 2, and the movable magnet 2 fitted on the resonance piece 12 may be fitted inside the resonance piece 12; at least one fixed magnet 3 is fitted in the mounting cavity 111, and the movable magnet 2 fitted to the resonator plate 12 is capable of interacting with the fixed magnet 3 by an ac signal to drive the resonator plate 12 to vibrate; wherein the resonance plate 12 may have an elastic structure such that the resonance plate 12 may be deformed to vibrate; the resonator plate 12 may be a hard structure, and the resonator plate 12 may be movably fitted to the resonator plate mounting hole 1111, so that the resonator plate 12 may be moved to vibrate; the resonance sheet 12 may be made of metal, plastic or a giant magnetostrictive material, wherein the resonance sheet 12 is preferably made of a giant magnetostrictive material, the magnetostrictive coefficient of the giant magnetostrictive material is much larger than that of a conventional magnetostrictive material, and the giant magnetostrictive material has high conversion rate between mechanical energy and electrical energy at room temperature, large energy density, high response speed and good reliability, and can effectively improve the sound effect of the invention, and the giant magnetostrictive material adopted by the resonance sheet 12 requires: coefficient of saturation magnetostriction greater than 10^-5The saturation magnetization field intensity is more than 40 kA/m, and the energy conversion efficiency is more than 45%.

The working principle of the invention for driving the resonance sheet 12 to sound is as follows: when the movable magnet 2 matched with the resonance sheet 12 is connected with an alternating electric signal containing audio information, the movable magnet 2 matched with the resonance sheet 12 generates an alternating magnetic field, so that the stress of the movable magnet 2 matched with the resonance sheet 12 in the magnetic field generated by the fixed magnet 3 matched with the installation cavity 1110 is changed, the movable magnet 2 matched with the resonance sheet 12 drives the resonance sheet 12 to vibrate, the resonance sheet 12 drives a resonance medium contacted with the resonance sheet to generate resonance, sound is emitted, and the conversion from the electric signal to the sound signal is completed.

As shown in fig. 1, in the first embodiment of the present invention, the mounting cavity 111 of the base 11 of the machine body 1 has a resonance mounting opening 1111, the resonance mounting opening 1111 is mounted with a resonance sheet 12, the number of the movable magnets 2 is one, the movable magnets 2 are fixed on the resonance sheet 12, and the inner wall of the mounting cavity 111 of the base 11 is fitted with a fixed magnet 3; it should be noted that, in the first embodiment of the present invention, the resonator plate 12 is not limited to one movable magnet 2, and one or more movable magnets 2 may be fitted to the resonator plate 12, and the larger the number of movable magnets 2 fitted to the resonator plate 12 is, the larger the amplitude of vibration of the resonator plate 12 is, and the larger the sound emitted by the present invention is.

As shown in fig. 2 and 3, in the second and third embodiments of the present invention, the mounting cavity 111 of the base 11 of the housing 1 has at least two resonance mounting openings 1111, each resonance mounting opening 1111 is mounted with a resonance plate 12, and the movable magnets 2 mounted on the respective resonance plates 12 are connected in series or in parallel, so that the respective resonance plates 12 of the present invention can respectively drive different resonance media to resonate simultaneously, thereby optimizing the sound. As shown in fig. 2, in the second embodiment of the present invention, the mounting cavity 111 of the base 11 of the machine body 1 has two resonator plate mounting openings 1111, the two resonator plate mounting openings 1111 are oppositely disposed, and one resonator plate 12 is mounted on each of the two resonator plate mounting openings 1111, a fixing frame 1112 is disposed in the mounting cavity 111, and the fixing frame 1112 is coupled with a fixed magnet 3. As shown in fig. 3, in the third embodiment of the present invention, the mounting cavity 111 of the base 11 of the machine body 1 has four resonance piece mounting openings 1111 that are opposite to each other in pairs, each of the four resonance piece mounting openings 1111 is mounted with one resonance piece 12, two opposite resonance openings 111 are perpendicular to two other opposite resonance piece mounting openings 1111, a fixing frame 1112 is disposed in the mounting cavity 111, and the fixing frame 1112 is matched with a fixed magnet 3. It should be noted that, in the second and third embodiments of the present invention, each resonator plate 12 is not limited to one movable magnet 2, and more than one movable magnet 2 may be fitted to each resonator plate 12, and the larger the number of movable magnets 2 fitted to the resonator plate 12 is, the larger the amplitude of vibration of the resonator plate 12 is, and the larger the sound emitted by the present invention is.

As shown in fig. 4, in the fourth embodiment of the present invention, the number of the fixed magnets 3 fitted in the mounting cavity 111 of the base 11 of the machine body 1 is the same as the number of the resonance plates 12 of the machine body 1, and the fixed magnets 3 are arranged opposite to the resonance plates 12 one by one, which helps to maximize the magnetic field applied by the fixed magnets 3 to the movable magnets 2 fitted to the resonance plates 12, thereby enabling the vibration amplitude of each resonance plate 12 to be large.

As shown in fig. 5, in the fifth embodiment of the present invention, the machine body 1 may further include a vibrating diaphragm 13; the mounting cavity 111 of the base 11 further has at least one diaphragm mounting opening 1113, each diaphragm mounting opening 1113 is mounted with a diaphragm 13, and the diaphragm 13 is fitted with at least one movable magnet 2, and the movable magnet 2 fitted on the diaphragm 13 can be fitted inside the diaphragm 13. Like this when the cooperation is at the moving magnet 2 of vibrating diaphragm 13 when the access contains the alternating signal of audio information, the cooperation produces the magnetic field of reversal at the moving magnet 2 of vibrating diaphragm 13, and then makes the cooperation change at the moving magnet 2 of vibrating diaphragm 13 in the atress in the magnetic field of the fixed magnet 3 production of cooperation in installation cavity 111, and then makes the cooperation drive vibrating diaphragm 13 at the moving magnet 2 of vibrating diaphragm 13 vibrate, so that vibrating diaphragm 13 vibrates the air and makes sound. The resonance sheet 12 of the invention drives the resonance medium contacted with the resonance sheet to generate resonance and can emit middle and low tones, and the vibrating diaphragm 13 vibrates air and can emit high tones, thus the invention can realize sound playing of full audio frequency and has good sound effect.

As shown in fig. 6, in a sixth embodiment of the present invention, the machine body 1 further includes a vibrating diaphragm 13; the base 11 of the base 1 is further provided with at least one assembly cavity 112, each assembly cavity 112 is provided with at least one diaphragm assembly opening 1121, the diaphragm assembly opening 1121 of each assembly cavity 112 is provided with a diaphragm 13, the diaphragm 13 is matched with at least one movable magnet 2, the movable magnet 2 matched with the diaphragm 13 can be matched on the inner side of the diaphragm 13, and each assembly cavity 112 is matched with a fixed magnet 3. In the sixth embodiment of the present invention, each assembly cavity 112, and the diaphragm 13, the movable magnet 2, and the fixed magnet 3 fitted to the assembly cavity 112 can constitute a non-resonant sound-emitting speaker unit capable of emitting sound by vibrating air; in a non-resonance sound-producing speaker monomer, when the movable magnet 2 matched with the vibrating diaphragm 13 of the non-resonance sound-producing speaker monomer is connected to an alternating electric signal containing audio information, the movable magnet 2 can generate an alternating magnetic field, so that the stress of the movable magnet 2 in the magnetic field generated by the fixed magnet 3 of the non-resonance sound-producing speaker monomer is changed, and the movable magnet 2 drives the vibrating diaphragm 13 to vibrate, so that the vibrating diaphragm 13 vibrates air and sounds. In the sixth embodiment of the present invention, a plurality of assembly cavities 112 may be disposed in the base 1, and the assembly cavities 112 are distributed in an array, so that sound effects of the non-resonant sound speakers when the non-resonant sound speakers generate sound together are good.

With reference to fig. 1 to 9, in the present invention, the movable magnet 2 is a semiconductor coil chip a fabricated by a semiconductor process; when the coil body of the semiconductor coil chip A is introduced with an alternating electric signal, the semiconductor coil chip A can generate an alternating magnetic field, and the semiconductor coil chip A is etched by adopting a semiconductor technology, so that the wire pitch of the coil body A11 in the semiconductor coil chip A is extremely small, and a finished product of the semiconductor coil chip A has the advantages of small volume and light weight compared with the existing coil formed by winding metal wires, and thus, the movable magnet 2 adopts the semiconductor coil chip A, and the micro-speaker disclosed by the invention is small in volume. As shown in fig. 1 to 9, the fixed magnet 3 may also be a semiconductor coil chip a manufactured by a semiconductor process, so that the volume of the micro-speaker of the present invention is smaller, and the fixed magnet 3 can generate a magnetic field when being powered on; of course, the fixed magnet 3 can also be a magnet directly, and the magnet itself can directly emit a magnetic field, and the cost is low.

In the first embodiment of the semiconductor coil chip a, as shown in fig. 7, specifically, the semiconductor coil chip a includes at least one coil layer a1, and at least one coil body a11 in a spiral shape is etched on a coil layer a 1; wherein in order to increase the strength of the magnetic field generated by the semiconductor coil chip A; when the number of the coil bodies A11 on the coil layer A1 is more than two, the coil bodies A11 of the coil layer A1 are connected in series and/or in parallel, so that the coil bodies A11 of the coil layer A1 can be connected with electric signals at the same time, and the magnetic fields generated by the coil bodies A11 of the coil layer A1 can be superposed together; in the case that the semiconductor coil chip a includes at least two coil layers a1, the coil bodies a11 of the coil layers a1 may be connected in series and/or in parallel, so that the coil layers a1 may be simultaneously connected to electrical signals to allow the magnetic fields generated by the coil layers a1 to be superimposed, thereby increasing the strength of the magnetic field generated by the semiconductor coil chip a. As shown in fig. 7, in the first embodiment of the semiconductor coil chip a, the semiconductor coil chip a may be matched with a magnetizer a2 having magnetic permeability, and the magnetizer a2 having magnetic permeability may reduce the magnetic resistance of the semiconductor coil chip a and strengthen the magnetic lines of the magnetic field generated by the semiconductor coil chip a, thereby increasing the strength of the magnetic field generated by the semiconductor coil chip a; the semiconductor coil chip A can be provided with a matching hole, the magnetizer A2 is arranged in the matching hole, and the magnetizer A2 can be made of one of mu alloy, permalloy, electric furnace steel, nickel-zinc ferrite, manganese-zinc ferrite, pure iron (0.05 impurity), magnetic conductive alloy (5Mo79Ni), soft steel (0.2C), iron (0.2 impurity), silicon steel (4Si), 78 permalloy (78Ni), nickel, platinum, aluminum and other substances with magnetic conductivity; the material of the magnetizer a2 may also be other magnetic materials doped with magnetic conductive elements, such as iron, nickel, copper, molybdenum, manganese, zinc, platinum, aluminum, etc. with magnetic conductivity.

Specifically, in the second embodiment of the semiconductor coil chip a, as shown in fig. 8, the semiconductor coil chip a includes at least one coil layer A1, at least one coil body a11 is disposed on the coil layer A1, the coil body a11 includes a plurality of metal line segments a111 etched on the coil layer A1 and arranged in a spiral shape, two ends of the metal line segment a111 of the coil body a11 are divided into a starting end a1111 and a trailing end a1112 in a spiral direction of the coil body a11, the metal line segments a111 of the coil body a11 are connected in parallel, wherein the starting ends a1111 of the metal line segments a111 of the coil body a11 are connected in parallel and the trailing ends a1112 of the metal line segments a111 of the coil body a11 are connected in parallel. Because the metal wire segments A111 of the coil body A11 are arranged in a spiral shape, and the metal wire segments A111 of the coil body A11 are connected in parallel, the current density of the coil layer A1 can be increased, and the overall resistance of the coil body A11 is reduced in a parallel connection manner, so that the semiconductor coil chip A can have a stronger magnetic field function when realizing a small size. In the second embodiment of the semiconductor coil chip a shown in fig. 9, the semiconductor coil chip a may further include an electrode layer A3, the electrode layer A3 is provided with a first electrode region a31 and a second electrode region a32, the first electrode region a31 is electrically connected to the start end a1111 of each metal segment a111 of the coil body a11 of the coil layer A1, and the second electrode region a32 is electrically connected to the end a1112 of each metal segment a111 of the coil body a11 of the coil layer A1, so that the metal segments a111 of the coil body a11 are connected in parallel through the electrode layer A3; the first electrode regions a31 of the electrode layer A3 are connected to the beginning a1111 of the wire segments a111 of the coil body a11 of the coil layer A1 via a plurality of first wires a311, respectively, and the second electrode regions a32 of the electrode layer A3 are connected to the ending a1112 of the wire segments a111 of the coil body a11 of the coil layer A1 via a plurality of second wires a321, respectively.

In the present invention, the resonance plate 12 may be made of a magnetic conductive material having magnetic conductivity, and the resonance plate 12 has magnetic conductivity and can reduce the magnetic resistance of the semiconductor coil chip a and strengthen the magnetic force lines of the magnetic field generated by the semiconductor coil chip a, thereby improving the strength of the magnetic field generated by the semiconductor coil chip a; the base 11 may also be made of a magnetic conductive material having magnetic conductivity, so that the base 11 has magnetic conductivity to reduce the magnetic resistance of the semiconductor coil chip a and strengthen the magnetic force lines of the magnetic field generated by the semiconductor coil chip a, thereby improving the strength of the magnetic field generated by the semiconductor coil chip a. In addition, in the present invention, the resonator plate 12 may be connected to the movable magnet 2 through a magnetic conductive plate having magnetic conductivity, and the magnetic conductive plate has magnetic conductivity to reduce the magnetic resistance of the semiconductor coil chip a and strengthen the magnetic lines of the magnetic field generated by the semiconductor coil chip a, thereby improving the strength of the magnetic field generated by the semiconductor coil chip a.

Further, the invention may further include a wireless communication module, which may be a bluetooth chip or a WiFi chip, electrically connected to the movable magnet 2, and configured to receive a wireless signal containing audio information sent by an external intelligent terminal (e.g., a smart phone or a tablet computer), and generate an alternating electrical signal to the movable magnet 2 according to the wireless signal.

The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.

Claims (13)

1. A micro-speaker, characterized by: comprises a machine body, a movable magnet capable of generating an alternating magnetic field under the action of an alternating electric signal and a fixed magnet capable of generating a magnetic field;

the machine body comprises a base and a resonance sheet, the base is provided with a mounting cavity, the mounting cavity is provided with at least one resonance sheet mounting hole, each resonance sheet mounting hole is provided with a resonance sheet capable of vibrating, and the resonance sheet is matched with at least one movable magnet; at least one fixed magnet is matched in the mounting cavity; the movable magnet is a semiconductor coil chip manufactured by adopting a semiconductor process, and the fixed magnet is a magnet or a semiconductor coil chip manufactured by adopting the semiconductor process.

2. The micro-speaker of claim 1, wherein: the mounting cavity of the machine body is provided with at least two resonance piece mounting ports, and the movable magnets matched on the resonance pieces are connected in series or in parallel.

3. The micro-speaker of claim 1 or 2, wherein: the number of the fixed magnets matched with the installation cavity is the same as that of the resonance sheets, and the fixed magnets and the resonance sheets are arranged in a one-to-one opposite mode.

4. The micro-speaker of claim 1, wherein: the resonance sheet is made of a magnetic conductive material with magnetic conductivity.

5. The micro-speaker of claim 1, wherein: the resonance sheet is connected with the movable magnet through a magnetic conductive sheet with magnetic conductivity.

6. The micro-speaker as claimed in claim 1, 4 or 5, wherein: the base is made of a magnetic conductive material with magnetic conductivity.

7. The micro-speaker as claimed in claim 1, 4 or 5, wherein: the machine body also comprises a vibrating diaphragm; the mounting cavity of base still has at least one vibrating diaphragm installing port, and a vibrating diaphragm is installed to every vibrating diaphragm installing port, just the vibrating diaphragm cooperation has at least one movable magnet.

8. The micro-speaker as claimed in claim 1, 4 or 5, wherein: the machine body also comprises a vibrating diaphragm; the base of base member still is equipped with at least one assembly chamber, and every assembly chamber has at least one vibrating diaphragm assembly orifice, and a vibrating diaphragm is installed to the vibrating diaphragm assembly orifice of every assembly chamber, the vibrating diaphragm cooperation has at least one movable magnet, and every assembly chamber in the cooperation have fixed magnet.

9. The micro-speaker of claim 1, wherein: the semiconductor coil chip is matched with a magnetizer with magnetic permeability.

10. The micro-speaker of claim 1, wherein: the semiconductor coil chip comprises at least one coil layer, and at least one coiled coil body is etched on the coil layer; when the number of the coil bodies on the coil layer is more than two, the coil bodies of the coil layer are connected in series and/or in parallel; when the semiconductor coil chip includes at least two coil layers, the coil bodies of the coil layers are connected in series and/or in parallel.

11. The micro-speaker of claim 1, wherein: the semiconductor coil chip comprises at least one coil layer, at least one coil body is arranged on the coil layer, the coil body comprises a plurality of metal wire sections etched on the coil layer and distributed in a spiral shape, two ends of each metal wire section of the coil body are divided into a starting end and an ending end along the spiral direction of the coil body, the starting ends of the metal wire sections of the coil body are connected in parallel, and the ending ends of the metal wire sections of the coil body are connected in parallel.

12. The micro-speaker of claim 11, wherein: the semiconductor coil chip also comprises an electrode layer, wherein the electrode layer is provided with a first electrode region and a second electrode region, the first electrode region is electrically connected with the initial end of each metal wire section of the coil body of the coil layer, and the second electrode region is electrically connected with the tail end of each metal wire section of the coil body of the coil layer.

13. The micro-speaker of claim 12, wherein: the first electrode area of the electrode layer is respectively connected with the starting end of each metal wire section of the coil body of the coil layer through a plurality of first metal wires; the second electrode area of the electrode layer is respectively connected with the tail end of each metal wire section of the coil body of the coil layer through a plurality of second metal wires.

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