A voice coil assembly and a loudspeaker

Abstract

The present invention discloses a voice coil assembly and a loudspeaker, comprising a main voice coil, wherein the main voice coil is formed by winding a first wire, wherein the first wire is a conductive wire coated with self-adhesive paint, and a connecting coil is bonded to the top of the main voice coil, wherein the connecting coil is formed by winding a second wire, wherein the second wire is a wire coated with self-adhesive paint, and the density of the second wire is less than or equal to the density of the first wire; the main voice coil and the connecting coil are formed by winding closely together and bonded together by the self-adhesive paint on the surface of the first wire and the second wire, and the main voice coil is used to connect to an external circuit, and the connecting coil is not connected to an external circuit. The voice coil assembly of the present invention can reduce the distortion of the loudspeaker and improve the acoustic performance of the loudspeaker.

Description

Technical Field

[0001] The invention relates to the field of electroacoustic technology, and in particular to a voice coil assembly and a loudspeaker. Background Art

[0002] A loudspeaker is a commonly used electroacoustic transducer device that converts electrical energy into sound energy. The loudspeaker mainly includes a vibration system, a magnetic circuit system and an auxiliary system. The vibration system includes a voice coil and a diaphragm assembly. The magnetic circuit system forms a magnetic gap to accommodate the voice coil. The voice coil is fixedly connected to the diaphragm and when the voice coil is energized, the diaphragm is driven to vibrate under the action of the magnetic field of the magnetic circuit system, thereby generating sound.

[0003] However, for traditional speakers, since the voice coil is in direct contact with the bottom of the diaphragm, most of the voice coil structure is located above the area where the magnetic flux lines are dense. The driving force factor BL value (the length of the wire L for a certain number of turns multiplied by the magnetic flux density per unit area B) is not high, and the magnetic field cannot be fully utilized, resulting in an unbalanced driving force for the up and down vibration of the main voice coil, causing speaker distortion and affecting the acoustic performance of the speaker. The voice coil itself has impedance and will generate heat when energized, which is equivalent to a heating wire. When the speaker vibrates up and down, the voice coil will emit a large amount of heat, and the diaphragm or centering support plate in direct contact with the voice coil will be damaged, causing the diaphragm to become a broken membrane. The centering support plate will carbonize when heated due to material problems, affecting the use of the product. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the problems in the prior art and provide a voice coil assembly and a loudspeaker which can improve the acoustic performance and prolong the life of the diaphragm and the centering support.

[0005] To solve the technical problem, a technical solution of the present invention is: a voice coil assembly, comprising a main body voice coil, the main body voice coil is formed by winding a first wire, the first wire is a conductive wire coated with self-adhesive paint, and the feature is: a connecting coil is bonded to the top of the main body voice coil, the connecting coil is formed by winding a second wire, the second wire is a wire coated with self-adhesive paint, and the density of the second wire is less than or equal to the density of the first wire;

[0006] The main voice coil and the connecting coil are closely wound and bonded together by self-adhesive paint on the surfaces of the first wire and the second wire. The main voice coil is used to connect to an external circuit, and the connecting coil is not connected to the external circuit.

[0007] As a preferred technical solution, the second wire is a conductive wire or an insulating wire.

[0008] As a preferred technical solution, the height of the main voice coil is greater than the height of the connecting coil.

[0009] As a preferred technical solution, the first wire is a copper enameled wire or a copper-clad aluminum enameled wire coated with self-adhesive paint, and the second wire is a copper-clad aluminum enameled wire or an aluminum enameled wire coated with self-adhesive paint.

[0010] As a preferred technical solution, the wire diameter of the second wire is smaller than the wire diameter of the first wire; or, the wire diameter of the second wire is equal to the wire diameter of the first wire; or, the wire diameter of the second wire is larger than the wire diameter of the first wire.

[0011] As a preferred technical solution, the thickness of the connecting coil is smaller than the thickness of the main voice coil;

[0012] The connecting coil is located on the inner side of the top surface of the main body voice coil, and an accommodation space is formed between the outer surface of the connecting coil and the outer side of the top surface of the main body voice coil;

[0013] Alternatively, the connecting coil is located on the outer side of the top surface of the main voice coil, and an accommodation space is formed between the inner side surface of the connecting coil and the inner side of the top surface of the main voice coil;

[0014] Alternatively, the connecting coil is located in the middle position of the top surface of the main voice coil, and an accommodating space is formed between the outer surface of the connecting coil and the outer side of the top surface of the main voice coil, and between the inner surface of the connecting coil and the inner side of the top surface of the main voice coil.

[0015] As a preferred technical solution, the connecting coil is located on the inner side of the top surface of the main voice coil, the top of the main voice coil is correspondingly provided with a groove opening to the inner side and the top surface of the main voice coil, and the bottom surface and the outer side surface of the lower end of the connecting coil are bonded to the bottom surface and the side surface of the groove of the main voice coil;

[0016] Alternatively, the connecting coil is located on the outside of the top surface of the main voice coil, and the top of the main voice coil is provided with a groove opening to the outside and top surface of the main voice coil, and the bottom surface and lower end inner side surface of the connecting coil are bonded to the bottom surface and side surface of the groove of the main voice coil.

[0017] As a preferred technical solution, the thickness of the connecting coil is equal to the thickness of the main voice coil, the inner diameter of the connecting coil is equal to the inner diameter of the main voice coil, and the outer diameter of the connecting coil is equal to the outer diameter of the main voice coil.

[0018] In order to solve the technical problem, a technical solution of the present invention is: a speaker, including a vibration system and a magnetic circuit system, the vibration system includes a diaphragm and a voice coil assembly, and its characteristics are: the voice coil assembly is composed of the above-mentioned main voice coil and the above-mentioned connecting coil bonded to the top of the main voice coil, the top surface of the connecting coil is connected to the diaphragm, and the main voice coil extends into the magnetic gap of the magnetic circuit system.

[0019] As a preferred technical solution, the vibration system further includes a centering support plate, and the centering support plate includes an inner fixing portion, an outer fixing portion, and a deformation portion connecting the inner fixing portion and the outer fixing portion;

[0020] The diaphragm includes a central portion, a folded ring portion and an edge portion from the inside to the outside, the inner fixing portion is connected to the central portion, and the outer fixing portion is connected to the edge portion;

[0021] The top surface of the connection coil is connected to the inner fixing portion.

[0022] As a preferred technical solution, the magnetic circuit system includes a magnetic yoke having an upper surface facing the vibration system and a lower surface opposite to the upper surface, and a recessed groove for avoiding the main voice coil is provided at a position of the upper surface corresponding to the magnetic gap.

[0023] As a preferred technical solution, a reinforcing portion protruding from the lower surface is provided at a position of the lower surface corresponding to the recessed groove, and a width of the reinforcing portion is greater than a width of the recessed groove.

[0024] After adopting the above technical solution, the beneficial effects of the present invention are:

[0025] In the voice coil assembly and the loudspeaker of the present invention, the connecting coil is bonded to the top of the main voice coil, so that most of the main voice coil is placed in the area with dense magnetic flux lines, the BL value is increased, and the driving force of the upper and lower vibrations of the main voice coil is balanced;

[0026] The density of the second wire is less than or equal to the density of the first wire, which can reduce the weight of the connecting coil, that is, the setting of the connecting coil reduces the weight burden on the up and down movement of the main voice coil;

[0027] The connecting coil and the main voice coil are bonded together by their own self-adhesive paint, which not only reduces the process of bonding the connecting coil and the main voice coil, but also improves the bonding efficiency of the connecting coil and the main voice coil. In addition, the bonding is more firm by the self-adhesive paint on the connecting coil and the main voice coil.

[0028] The main voice coil is used to connect to the external circuit, while the connecting coil is not connected to the external circuit. The connecting coil can only transfer a small amount of heat from the main voice coil or not transfer the heat from the main voice coil to the diaphragm or the centering support, thus protecting the diaphragm and the centering support from damage during the operation of the speaker. At the same time, the connecting coil can also play a good heat dissipation role and reduce the temperature of the main voice coil.

[0029] In summary, the voice coil assembly and the loudspeaker of the present invention can effectively reduce the distortion of the loudspeaker and improve the acoustic performance of the loudspeaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] Figure 1 is a schematic diagram of a structural cross-section of a loudspeaker in the present invention;

[0032] Figure 2 It is a schematic diagram of the decomposed structure of the voice coil assembly of the present invention;

[0033] Figure 3 This is a schematic structural cross-sectional view of the present invention when the connecting coil wire diameter is smaller than the main body voice coil wire diameter, and the connecting coil is located in the middle of the main body voice coil;

[0034] Figure 4 It is a schematic cross-sectional view of the structure of the connection coil located outside the main voice coil when the connection coil wire diameter is smaller than the main voice coil wire diameter of the present invention;

[0035] Figure 5 This is a schematic cross-sectional view of the structure of the connection coil located inside the main voice coil when the connection coil wire diameter is smaller than the main voice coil wire diameter of the present invention;

[0036] Figure 6 It is a schematic cross-sectional view of the structure of the present invention at a position where the wire diameters of the connecting coil and the main voice coil are equal when the thickness of the connecting coil is equal to the thickness of the main voice coil;

[0037] Figure 7 It is a schematic cross-sectional view of the structure of the present invention at a position where the wire diameter of the connecting coil is greater than the wire diameter of the main voice coil when the thickness of the connecting coil is equal to the thickness of the main voice coil;

[0038] Figure 8 It is a schematic cross-sectional view of the structure of the connection coil being located outside the main voice coil when the connection coil wire diameter is larger than the main voice coil wire diameter of the present invention;

[0039] Fig. 9 It is a schematic cross-sectional view of the structure of the connection coil located inside the main voice coil when the connection coil wire diameter is larger than the main voice coil wire diameter of the present invention;

[0040] Fig.10 This is a schematic structural cross-sectional view of the present invention when the connecting coil wire diameter is larger than the main body voice coil wire diameter, and the connecting coil is located in the middle of the main body voice coil;

[0041] Fig.11 It is a schematic cross-sectional view of the structure of the present invention at a position where the connecting coil wire diameter is smaller than the main body voice coil wire diameter when the connecting coil thickness is equal to the main body voice coil thickness;

[0042] Fig.12 This is a schematic structural cross-sectional view of the present invention when the connecting coil wire diameter is equal to the main body voice coil wire diameter, and the connecting coil is located inside the main body voice coil;

[0043] Fig.13 It is a schematic structural cross-sectional diagram of the present invention in which the connecting coil is located outside the main voice coil when the connecting coil wire diameter is equal to the main voice coil wire diameter;

[0044] Fig.14 This is a schematic structural cross-sectional view of the present invention when the connecting coil wire diameter is equal to the main body voice coil wire diameter, and the connecting coil is located in the middle of the main body voice coil;

[0045] Fig.15 It is the BL(X) curve diagram of the voice coil of the present invention.

[0046] Description of Figure Numbers:

[0047] 1. Voice coil assembly, 11. Main voice coil, 12. Connecting coil, 2. Magnetic yoke, 3. Diaphragm, 4. Bonding surface of voice coil assembly, 5. Recessed groove, 6. Reinforcement part, A. BL curve of the main voice coil in the prior art, B. BL curve of the main voice coil after adding the connecting coil.

[0048] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0051] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] The present invention provides a voice coil structure, which can be applied to electronic devices capable of producing sound, such as loudspeakers, earphones, and mobile phones.

[0053] Please combine Figure 1 , Figure 2 As shown, the voice coil assembly includes a main voice coil 11, which is formed by winding a first wire, which is a conductive wire coated with self-adhesive paint. A connecting coil 12 is bonded to the top of the main voice coil 11, and the connecting coil 12 is formed by winding a second wire, which is a conductive wire coated with self-adhesive paint. The density of the second wire is less than or equal to the density of the first wire.

[0054] The main voice coil 11 and the connecting coil 12 are wound closely together, and are bonded together by the self-adhesive paint on the surface of the first wire and the second wire under the action of hot air. The connecting coil 12 only supports the main voice coil 11. The main voice coil 11 is used to connect to the external circuit, while the connecting coil 12 is not connected to the external circuit. Therefore, during the up and down vibration of the main voice coil 11, the connecting coil 12 can only transfer a small amount of heat from the main voice coil 11 or no heat from the main voice coil 11 to the diaphragm 3 or the centering support plate, protecting the diaphragm 3 and the centering support plate from damage during operation; at the same time, part of the heat of the main voice coil 11 will be transferred to the connecting coil 12 for heat dissipation, so the connecting coil 12 can also play a good heat dissipation role and reduce the temperature of the main voice coil 11.

[0055] The connection between the connecting coil 12 and the main voice coil 11 is bonded by their respective self-adhesive paints, which not only reduces the number of steps in the bonding process of the connecting coil 12 and the main voice coil 11 and improves the bonding efficiency of the connecting coil 12 and the main voice coil 11, but also makes the bonding more firm by the self-adhesive paints on the connecting coil 12 and the main voice coil 11.

[0056] Since the second coil is not connected to an external circuit, the material of the second wire can be a conductive wire or an insulating wire, which will not affect the up and down vibration of the main voice coil 11 under the action of the magnetic field when powered.

[0057] To further ensure that the density of the second wire is less than or equal to the density of the first wire, the first wire may be a copper enameled wire or a copper clad aluminum enameled wire coated with self-adhesive paint, and the second wire may be a copper clad aluminum enameled wire or an aluminum enameled wire coated with self-adhesive paint.

[0058] The density of the first wire and the density of the second wire are specifically explained as follows: if the second wire is a copper-clad aluminum enameled wire coated with self-adhesive paint, the density of the second wire is the density of the copper-clad aluminum wire. Traditionally, the density formula of the copper-clad aluminum wire is: copper-clad aluminum density = 8.89*copper content%+2.7*(1-copper content%), where the copper content% is the volume ratio of copper to the copper-clad aluminum wire conductor. Generally, the density of copper is 8.9g / cm3, while the volume ratio of copper to the copper-clad aluminum wire conductor on the market generally increases by 10%, 15%, and 20% in sequence. In order to ensure that the density of the second wire is less than or equal to the density of the first wire, a copper-clad aluminum wire with a copper layer volume ratio of 10% is preferred, and its density is 3.32g / cm 3 , to ensure that the connecting coil 12 is light enough than the main voice coil 11 in weight, so that the main voice coil 11 can vibrate freely up and down in the magnetic field after being energized.

[0059] In order to ensure that the main voice coil vibrates up and down in the magnetic gap after power is turned on, the height of the main voice coil must be ensured. At the same time, in order to reduce the weight burden of the connecting coil on the up and down vibration of the main voice coil, the height of the main voice coil is greater than the height of the connecting coil.

[0060] Since the density of the second wire is less than or equal to the density of the first wire, and the height of the main voice coil is greater than the height of the connecting coil, there is no restriction on the selection of the wire diameters of the first wire and the second wire. The wire diameter of the second wire can be smaller than the wire diameter of the first wire; or, the wire diameter of the second wire is equal to the wire diameter of the first wire; or, the wire diameter of the second wire is greater than the wire diameter of the first wire. No matter which wire diameter is selected, it will not affect the normal operation of the voice coil assembly 1.

[0061] In this embodiment, the connecting coil 12 is bonded to the top of the main voice coil 11. On the one hand, the connecting coil 12 plays a role of connecting between the main voice coil 11 and the diaphragm 3, so that most of the main voice coil 11 is placed in the dense magnetic flux line area, thereby improving the BL value and further combining Fig.15 The simulation results show that the BL value in this embodiment is greatly improved compared with the prior art. Fig.15 In the figure, after adding the connecting coil 12, the BL curve of the main voice coil 11 tends to be symmetrical about the 0 scale line in the BL(X) curve diagram, indicating that the driving force for the up and down vibration of the main voice coil 11 is more balanced, thereby improving the output sensitivity of the product and achieving the effect of reducing the distortion of the speaker to ensure its better acoustic performance. On the other hand, the density of the second wire is less than or equal to the density of the first wire. Compared with the prior art, the setting of the connecting coil 12 reduces the weight burden on the up and down movement of the main voice coil 11, so that the main voice coil 11 can vibrate freely up and down under the action of the magnetic field after being energized.

[0062] In order to achieve a better technical effect, the thickness of the connecting coil 12 is smaller than the thickness of the main voice coil 11, so that less wire is used for the connecting coil 12. Figure 5 , Fig. 9 and Fig.12 As shown, when the connecting coil 12 is located on the inner side of the top surface of the main voice coil 11 , an accommodation space is formed between the outer surface of the connecting coil 12 and the outer side of the top surface of the main voice coil 11 .

[0063] Or, combined Figure 4 , Figure 8 and Fig.13 As shown, the connecting coil 12 is located on the outer side of the top surface of the main voice coil 11 , and an accommodation space is formed between the inner side surface of the connecting coil 12 and the inner side of the top surface of the main voice coil 11 .

[0064] Or, combined Figure 3 , Fig.10 and Fig.14 As shown, the connecting coil 12 is located in the middle position of the top surface of the main voice coil 11, and an accommodating space is formed between the outer surface of the connecting coil 12 and the outer side of the top surface of the main voice coil 11, as well as between the inner surface of the connecting coil 12 and the inner side of the top surface of the main voice coil 11.

[0065] A voice coil assembly bonding surface 4 is formed between the top surface of the connecting coil and the bottom surface of the diaphragm 3. Generally, when the voice coil assembly 1 and the diaphragm 3 are bonded, the adhesive will overflow from both sides of the voice coil during the fixing process of the voice coil assembly 1 and the diaphragm 3, forming a glue layer of a certain thickness, which will collide with the magnetic circuit system and interfere with the magnetic circuit system. In this embodiment, the accommodating space formed between the inner side surface or the outer side surface of the connecting coil 12 and the top surface of the main voice coil 11 and the voice coil assembly bonding surface 4 can accommodate the overflowed glue and provide more bonding space for the adhesive, thereby increasing the firmness between the connecting coil 12 and the diaphragm 3 and reducing the probability of the voice coil assembly 1 falling off the diaphragm 3 during the up and down vibration of the voice coil assembly 1.

[0066] The connecting coil 12 is bonded to the top surface of the main voice coil 11. In order to increase the firmness of the connection between the connecting coil 12 and the main voice coil 11, the connecting coil 12 is bonded to the top surface of the main voice coil 11. Figure 2 As shown, when the connecting coil 12 is located on the inner side of the top surface of the main voice coil 11, the top of the main voice coil 11 is correspondingly provided with a groove opening to the inner side and the top surface of the main voice coil 11, and the bottom surface and the outer side surface of the lower end of the connecting coil 12 are bonded to the bottom surface and the side surface of the groove of the main voice coil 11. Compared with the connecting coil 12 being bonded only to the top surface of the main voice coil 11, the bottom surface of the connecting coil 12 and the side surface of the bottom of the connecting coil 12 are both bonded to the main voice coil 11, so that the connecting coil 12 and the main voice coil 11 are more firmly bonded.

[0067] Or, combined Figure 4 As shown, the connecting coil 12 is located on the outside of the top surface of the main voice coil 11, and the top of the main voice coil 11 is correspondingly provided with a groove opening to the outside and top surface of the main voice coil 11, and the bottom surface and the inner side surface of the lower end of the connecting coil 12 are bonded to the bottom surface and the side surface of the groove of the main voice coil 11. The effect achieved by the bonding method is the same as the effect of bonding the connecting coil 12 to the groove on the inner side of the main voice coil 11, which will not be repeated.

[0068] Since the density of the material of the connecting coil 12 is less than or equal to the density of the material of the main voice coil 11, when the connecting coil 12 is bonded to the main voice coil 11, the thickness of the connecting coil 12 can be allowed to be the same as the thickness of the main voice coil 11, and the inner diameter of the connecting coil 12 is equal to the inner diameter of the main voice coil 11, and the outer diameter of the connecting coil 12 is equal to the outer diameter of the main voice coil 11, thereby achieving the purpose of making the connecting coil 12 lighter than the main voice coil, and placing most of the main voice coil 11 in the magnetic circuit, thereby improving the output sensitivity of the product, reducing the distortion of the speaker, and improving the acoustic performance of the speaker.

[0069] The voice coil assembly 1 of the present invention is mostly used in loudspeakers. The loudspeakers include a vibration system and a magnetic circuit system. The vibration system includes a diaphragm 3 and a voice coil assembly 1. The voice coil assembly 1 mentioned is the voice coil assembly 1 mentioned in the above embodiments. The top surface of the connecting coil 12 is bonded to the bottom surface of the diaphragm 3 by an adhesive. The main voice coil 11 extends into the magnetic gap of the magnetic circuit system. After the main voice coil 11 is energized, it vibrates up and down under the action of the magnetic field, and then drives the diaphragm 3 to vibrate and emit sound. Because the loudspeaker in this embodiment can include the voice coil assembly 1 in any of the above embodiments, it can also achieve the same technical effects as the above embodiments, which will not be repeated here.

[0070] In another specific embodiment, the vibration system further includes a centering support plate, and the centering support plate includes an inner fixing portion, an outer fixing portion, and a deformation portion connecting the inner fixing portion and the outer fixing portion.

[0071] The diaphragm 3 includes a central portion, a folded ring portion and an edge portion from the inside to the outside. The inner fixing portion is connected to the central portion, and the outer fixing portion is connected to the edge portion.

[0072] The top surface of the connecting coil 12 is connected to the inner fixing part. The centering support is mainly used to maintain the correct position of the voice coil assembly 1 in the magnetic gap, and to keep the voice coil assembly 1 under force so that the vibration system only reciprocates along the axial direction to avoid polarization.

[0073] Combination Figure 1 As shown, the magnetic circuit system includes a magnetic yoke 2, and an inner magnetic circuit part and an outer magnetic circuit part arranged on the magnetic yoke 2, and a magnetic gap is formed between the two.

[0074] In this specific embodiment, the magnetic yoke 2 has an upper surface facing the vibration system and a lower surface opposite to the upper surface, and a concave groove 5 is provided at a position corresponding to the magnetic gap on the upper surface for avoiding the main voice coil 11, so as to provide a larger space for the up and down vibration of the main voice coil 11.

[0075] Since a recessed groove 5 is provided on the upper surface, the thickness of the magnetic yoke 2 at the position of the recessed groove will be reduced. In order to ensure the strength of the lower surface, a reinforcing portion 6 protruding from the lower surface is provided at the position of the lower surface corresponding to the recessed groove 5, and the width of the reinforcing portion 6 is greater than the width of the recessed groove 5.

[0076] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A voice coil assembly, comprising a main voice coil, wherein the main voice coil is formed by winding a first wire, wherein the first wire is a conductive wire coated with a self-adhesive paint, and wherein: A connecting coil is bonded to the top of the main voice coil, and the connecting coil is formed by winding a second wire material, the second wire material is a wire material coated with self-adhesive paint, and the density of the second wire material is less than or equal to the density of the first wire material; The main body voice coil and the connecting coil are formed by being wound closely together and bonded together by self-adhesive paint on the surfaces of the first wire and the second wire, and the main body voice coil is used to be connected to an external circuit, and the connecting coil is not connected to the external circuit; The thickness of the connecting coil is smaller than that of the main voice coil. The connecting coil is located in the middle position of the top surface of the main voice coil. An accommodating space is formed between the outer surface of the connecting coil and the outer side along the top surface of the main voice coil, and between the inner surface of the connecting coil and the inner side of the top surface of the main voice coil. The second wire is a conductive wire or an insulating wire.

2. The voice coil assembly according to claim 1, wherein: The height of the main voice coil is greater than the height of the connecting coil.

3. The voice coil assembly according to claim 1, wherein: The first wire is a copper enameled wire or a copper-clad aluminum enameled wire coated with self-adhesive paint, and the second wire is a copper-clad aluminum enameled wire or an aluminum enameled wire coated with self-adhesive paint.

4. The voice coil assembly according to claim 1, wherein: The wire diameter of the second wire is smaller than the wire diameter of the first wire; or, the wire diameter of the second wire is equal to the wire diameter of the first wire; or, the wire diameter of the second wire is larger than the wire diameter of the first wire.

5. The voice coil assembly according to claim 1, wherein: The thickness of the connecting coil is equal to the thickness of the main voice coil, the inner diameter of the connecting coil is equal to the inner diameter of the main voice coil, and the outer diameter of the connecting coil is equal to the outer diameter of the main voice coil.

6. A loudspeaker, comprising a vibration system and a magnetic circuit system, wherein the vibration system comprises a diaphragm and a voice coil assembly, characterized in that: The voice coil assembly is the voice coil assembly according to any one of claims 1 to 5, the top surface of the connecting coil is connected to the diaphragm, and the main voice coil extends into the magnetic gap of the magnetic circuit system.

7. The loudspeaker according to claim 6, characterized in that: The vibration system further includes a centering support plate, wherein the centering support plate includes an inner fixing portion, an outer fixing portion, and a deformation portion connecting the inner fixing portion and the outer fixing portion; The diaphragm includes a central portion, a folded ring portion and an edge portion from the inside to the outside, the inner fixing portion is connected to the central portion, and the outer fixing portion is connected to the edge portion; The top surface of the connection coil is connected to the inner fixing portion.

8. The loudspeaker according to claim 6, characterized in that: The magnetic circuit system comprises a magnetic yoke having an upper surface facing the vibration system and a lower surface opposite to the upper surface. A recessed groove for avoiding the main voice coil is provided at a position of the upper surface corresponding to the magnetic gap.

9. The loudspeaker according to claim 8, characterized in that: A reinforcing portion protruding from the lower surface is provided at a position of the lower surface corresponding to the concave groove, and a width of the reinforcing portion is greater than a width of the concave groove.

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