Moving-iron loudspeaker

Abstract

The utility model relates to a moving-iron horn, which comprises a support, a magnet, a voice coil, a magnetic conductive rod and a vibrating diaphragm, the magnet is fixed on the support, the voice coil is wound on the magnet, the vibrating diaphragm is connected between the magnetic conductive rod and the support, the magnetic conductive rod surrounds the outer side of the magnet, the magnetic conductive rod and the magnet are arranged at intervals, and a plurality of hollow areas are formed on the magnetic conductive rod. According to the moving-iron loudspeaker provided by the invention, the plurality of hollow areas are formed on the magnetic conductive rod, so that the production cost of the moving-iron loudspeaker and the weight of the magnetic conductive rod can be reduced, and the application scenarios of the moving-iron loudspeaker are increased.

Description

Technical Field

[0001] This utility model relates to the field of loudspeaker technology, and in particular to a moving iron loudspeaker. Background Technology

[0002] With the continuous improvement of headphone product lines, balanced armature headphones have become increasingly popular among consumers. Balanced armature headphones are essentially dynamic drivers with an additional balanced armature driver to improve high-frequency resolution and natural sound reproduction. Typically, the dynamic driver is fixed in a designated position in the front cavity, and the balanced armature driver is installed inside the sound outlet of the front cavity. A balanced armature driver is a common audio output device in headphones and speakers. It uses a balanced armature driver unit to convert electrical pulses into sound waves, allowing us to hear sound. The working principle of a balanced armature driver is that, under the influence of a magnetic field, the magnetic force generated by an electric current acts on the driver unit, causing it to vibrate and produce sound. Unlike dynamic drivers, balanced armature drivers have a more complex structure, greater driving force, and a wider dynamic range. Current balanced armature drivers require precise manufacturing equipment and high-precision processes, resulting in high production costs and relatively poor bass performance, thus limiting their application scenarios. Therefore, there is an urgent need for a balanced armature driver that can reduce production costs while expanding its application scenarios. Utility Model Content

[0003] Therefore, it is necessary to provide a moving iron horn that can reduce production costs and the weight of the magnetic rod, thereby increasing the application scenarios of the moving iron horn.

[0004] This application provides a moving iron loudspeaker, including a bracket, a magnet, a voice coil, a magnetic rod, and a diaphragm. The magnet is fixed to the bracket, the voice coil is wound around the magnet, the diaphragm is connected between the magnetic rod and the bracket, the magnetic rod surrounds the outside of the magnet and is spaced apart from the magnet, and multiple hollow areas are formed on the magnetic rod; the magnetic rod can move vertically under the action of the magnetic field generated by the magnet and the voice coil.

[0005] In the moving iron horn provided in this application, the magnetic guide rod is arranged around the outside of the magnet and spaced apart from the magnet. Multiple hollow areas are formed on the magnetic guide rod. Setting multiple hollow areas can reduce production costs and the weight of the magnetic guide rod, thereby increasing the application scenarios of the moving iron horn.

[0006] In one embodiment, the magnetic rod includes a top shell and a side shell. The top shell includes an outer peripheral skeleton and a plurality of top skeletons. The side shells and the top skeletons are both connected to the outer peripheral skeleton. The hollow area includes a top hollow area. The plurality of top skeletons are arranged circumferentially at intervals so that the top hollow area is formed between adjacent top skeletons.

[0007] In one embodiment, the top frame has an arc-shaped structure, the shape of the central region of the diaphragm is adapted to the shape of the top frame, and the central region of the diaphragm is fixed to the top frame.

[0008] In one embodiment, the top shell includes an intermediate connecting frame, with one end of each top skeleton away from the outer peripheral skeleton connected to the intermediate connecting frame. The intermediate connecting frame is opposite to the top of the magnet, and the intermediate connecting frame, the outer peripheral skeleton, and two adjacent top supports enclose a top hollow area.

[0009] In one embodiment, the intermediate connecting frame extends toward the magnet along the vertical direction of the magnet and is spaced apart from the magnet.

[0010] In one embodiment, the intermediate connecting frame has a groove on the side away from the magnet, and a through hole is formed at the bottom of the groove on the side near the magnet. The diaphragm is connected to the side of the intermediate connecting frame away from the magnet and covers the groove.

[0011] In one embodiment, the side of the intermediate connecting frame away from the magnet has an arcuate structure, the shape of the middle region of the diaphragm is adapted to the arcuate structure, and the central region of the diaphragm is fixed to the top frame.

[0012] In one embodiment, the vertical distance between the intermediate connecting frame and the magnet is greater than the vertical distance between the side shell and the support.

[0013] In one embodiment, the hollow area includes a side hollow area, the side shell includes a plurality of side skeletons, the side skeletons are connected to the outer peripheral skeleton, the plurality of side skeletons are arranged at circumferential intervals, the side hollow area is formed between adjacent skeletons, and the side skeletons are opposite to the radial side surface of the magnet.

[0014] In one embodiment, the side frame extends vertically along the magnet and is parallel to the outer surface of the magnet; a bent portion is connected to one end of the side frame away from the top shell, and the bent portion is perpendicular to the side frame; the number of top frames and side frames is the same, and the outer peripheral frame has a circular ring structure. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0016] Figure 1 This is a schematic diagram of the structure of a moving iron horn provided in one embodiment of this application;

[0017] Figure 2 for Figure 1Enlarged view of the area indicated by the dashed line;

[0018] Figure 3 for Figure 1 Enlarged view of the area indicated by the dashed line;

[0019] Figure 4 for Figure 1 Enlarged view of the area indicated by the dashed line;

[0020] Figure 5 A schematic diagram of a portion of the structure of a moving iron horn provided in an embodiment of this application;

[0021] Figure 6 A schematic diagram of a portion of the structure of a moving iron horn provided in an embodiment of this application;

[0022] Figure 7 This is a schematic diagram of the structure of a moving iron horn provided in one embodiment of this application;

[0023] Figure 8 A schematic diagram of a portion of the structure of a moving iron horn provided in an embodiment of this application;

[0024] Figure 9 A schematic diagram of a portion of the structure of a moving iron horn provided in an embodiment of this application;

[0025] Figure 10 This is a schematic diagram of a portion of the structure of a moving iron horn provided in an embodiment of this application.

[0026] Reference numerals: 10 for moving iron horn; 20 for bracket; 30 for magnet; 40 for voice coil; 50 for cylindrical magnetic rod; 51 for hollow area; 511 for top hollow area; 512 for side hollow area; 5121 for side frame; 5121a for bent part; 52 for top shell; 521 for outer peripheral frame; 522 for top frame; 523 for intermediate connecting frame; 5231 for groove; 5231a for through hole; 5232 for curved surface structure; 53 for side shell; 60 for diaphragm; 61 for center area. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] As headphone product lines continue to improve, balanced armature headphones have become increasingly popular among consumers. Balanced armature headphones add a balanced armature driver to a standard dynamic driver to enhance high-frequency resolution and natural sound reproduction. Typically, the dynamic driver is fixed in a designated position within the front cavity, and the balanced armature driver is installed inside the sound outlet of the front cavity. A balanced armature driver is a common audio output device for headphones and speakers. It uses a balanced armature driver unit to convert electrical pulses into sound waves, allowing us to hear sound. The working principle of a balanced armature driver is that, under the influence of a magnetic field, the magnetic force generated by an electric current acts on the driver unit, causing it to vibrate and produce sound. Balanced armature drivers have a fast response time, can present a wider frequency range, and provide a more realistic and natural sound effect; at the same time, the sound effect is clearer, providing clearer sound quality. Balanced armature drivers are more sensitive than dynamic drivers, consume less power, and can better protect the ears. Unlike dynamic drivers, balanced armature drivers have a more complex structure, greater driving force, and a wider dynamic range. Existing balanced armature loudspeakers require precision manufacturing equipment and advanced processes, resulting in high production costs and relatively poor bass performance, thus limiting their application scenarios. Therefore, there is an urgent need for a balanced armature loudspeaker that can reduce production costs while expanding its application range. The following description uses a cylindrical magnetic rod as an example, but is not limited to a cylindrical structure. The magnetic rod can be any rotationally symmetrical structure about a vertical axis, allowing it to move smoothly in the vertical direction.

[0032] refer to Figures 1-10 To solve the above problems, this application provides a moving iron speaker 10, including a bracket 20, a magnet 30, a voice coil 40, a magnetic rod and a diaphragm 60. The magnet 30 is fixed to the bracket 20, the voice coil 40 is wound around the magnet 30, the diaphragm 60 is connected between the magnetic rod and the bracket 20, the magnetic rod surrounds the outside of the magnet 30 and is spaced apart from the magnet 30, and a plurality of hollow areas 51 are formed on the magnetic rod.

[0033] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 10 , Figure 1This is a schematic diagram of the structure of a moving iron speaker 10 according to an embodiment of this application. The moving iron speaker 10 includes a support 20, a magnet 30, a voice coil 40, a cylindrical magnetic rod 50, and a diaphragm 60. The working principle of the moving iron speaker 10 is that a high-strength permanent magnet continuously releases magnetic force, surrounded by magnetic field lines. When current passes through the coil, the coil generates magnetic force, which repels or attracts the original magnetic field, thereby driving the diaphragm 60 to vibrate and produce sound. Similar to the working principle of a relay, when a signal flows into the voice coil 40, a magnetic induction magnetic field is formed, creating a temporary magnet on the cylindrical magnetic rod 50. This magnet attracts or repels the magnet 30, causing the diaphragm to move up and down, thus pushing the air to produce sound. This design gives the moving iron speaker 10 a natural and delicate sound with excellent low-frequency performance. The support 20 of the moving iron speaker 10 is a high-quality magnetic conductor, made of high-performance magnetic materials such as neodymium iron boron, and is glued to the center of the support 20. In some embodiments, the magnet 30 is fixed to the bracket 20, which can be made of iron, cobalt, or alloy materials. In some embodiments, the bracket 20 can be made of ferrite, a common magnetic material with good magnetic permeability and stability, typically used in the bracket 20 of the moving iron speaker 10, providing good sound quality and audio response. The bracket 20 can also be made of neodymium iron boron, a high-performance magnetic material with high energy product and coercivity, used in high-end moving iron speaker 10 brackets 20, providing better sound quality and audio characteristics, but at a relatively high price. The magnet 30 of the moving iron speaker 10 can be made of different materials depending on the application and budget. AlNiCo magnets are suitable for users who pursue classic sound quality and have a sufficient budget. AlNiCo magnets are an alloy magnet with cobalt, aluminum, and nickel as the main elements. They have good corrosion resistance and high-temperature stability, and are commonly used in audio equipment and car audio systems. Neodymium iron boron (NdFeB) magnets are suitable for the high-end speaker market, catering to users who prioritize ultimate sound quality and design. They are rare-earth alloy magnets composed of elements such as iron oxide, neodymium, iron, and boron. They possess a high magnetic energy product, making them suitable for miniaturized and lightweight designs. Commonly used in the high-end speaker market, they offer excellent sound quality and rich detail. Ceramic magnets are suitable for low-power products. Made from materials such as iron oxide and barium carbonate, they possess good corrosion resistance and mechanical strength, making them suitable for low-power products such as flashlights and power tools. Ferrite magnets are suitable for applications with limited budgets and lower sound quality requirements. Ferrite magnets are inexpensive and offer high cost-effectiveness, making them suitable for audio speakers requiring higher sound output, although their frequency range is relatively narrow.

[0034] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 10In some embodiments, the voice coil 40 of the moving iron speaker 10 is wound around the center of a permanent magnetic field and is wound around a magnet 30. This iron sheet drives the diaphragm 60 to produce sound under the action of magnetic force. The voice coil 40 is made of enameled wire wound into a multi-layered cylindrical shape, the height of which is defined according to actual needs, and is fitted onto the magnet 30 and glued to the magnet 30. Figure 5 This is a schematic diagram of the cylindrical magnetic rod 50 of the moving iron horn 10 provided in one embodiment of this application. In some embodiments, the cylindrical magnetic rod 50 is an excellent magnetic conductor. The cylindrical magnetic rod 50 surrounds the outside of the magnet 30 and is spaced apart from the magnet 30. Multiple hollow areas 51 are formed on the cylindrical magnetic rod 50. The structure of having multiple hollow areas 51 on the cylindrical magnetic rod 50 can reduce the weight of the cylindrical magnetic rod 50 and reduce the production cost of the moving iron horn 10. By making most of the material of the cylindrical magnetic rod 50 hollow, the cylindrical magnetic rod 50 becomes a skeleton shape. Specifically, in one embodiment, the upper half of the cylindrical magnetic rod 50 is an arc-shaped surface and hollow, with six remaining skeletons, and a countersunk hole in the center to bring the cylindrical magnetic rod 50 closer to the magnet 30. The central part and the sides of the countersunk hole are also hollowed out. In other embodiments, the number, width, and thickness of the skeleton of the cylindrical magnetic rod 50 in the aforementioned embodiments can be adjusted according to actual design needs. In some embodiments, the diaphragm 60 connects the cylindrical magnetic rod 50 and the support 20. The diaphragm 60 is generally made of composite materials, including high-rigidity, low-mass materials such as cellulose and polyimide. This material has the characteristics of high strength, high rigidity, low density, and low distortion, which can achieve better sound quality performance. The material of the diaphragm 60 determines its performance in high and low frequencies. High-strength, high-rigidity materials can achieve faster oscillation and more accurate frequency response, thereby improving the fidelity of sound quality. Low-density, low-distortion materials can reduce sound distortion and improve the realism and detail of music. In some embodiments, the middle arc-shaped part has the same arc shape as the upper half of the cylindrical magnetic rod 50 and is bonded to the arc-shaped skeleton of the cylindrical magnetic rod 50. The two ends of the diaphragm 60 are bonded to the steps on both sides of the support 20.

[0035] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 5This is a schematic diagram of the cylindrical magnetic rod 50 of a moving iron horn 10 according to an embodiment of this application. In some embodiments, the cylindrical magnetic rod 50 includes a top shell 52 and a side shell 53. The top shell 52 includes an outer peripheral frame 521 and a plurality of top frames 522. The side shells 53 and the top frames 522 are all connected to the outer peripheral frame 521, which can further reduce the production cost of the moving iron horn 10. The hollow area 51 includes a top hollow area 511. The plurality of top frames 522 are arranged circumferentially to form a top hollow area 511 between adjacent top frames 522, which can further reduce the production cost of the moving iron horn 10 and reduce the weight of the cylindrical magnetic rod 50. For example, the top shell 52 includes an outer peripheral frame 521 and six top frames 522. The side shells 53 and the top frames 522 are all connected to the outer peripheral frame 521. The six top frames 522 are arranged circumferentially to form a top hollow area 511 between adjacent top frames 522. In some embodiments, the outer peripheral skeleton 521 has a ring-shaped structure.

[0036] See Figure 1 , Figure 5 , Figure 6 , Figure 7 and Figure 10 , Figure 8 , Figure 9 and Figure 10 This is a schematic diagram of the diaphragm 60 of a moving iron speaker 10 provided in one embodiment of this application. The top frame 522 has an arc-shaped structure. The shape of the central region 61 of the diaphragm 60 is adapted to the shape of the top frame 522. The central region 61 of the diaphragm 60 is fixed to the top frame 522. The fixation between the central region 61 of the diaphragm 60 and the top frame 522 can be achieved using epoxy adhesive. Epoxy adhesive is a glue composed of epoxy resin and a curing agent, which has the characteristics of high hardness, strong adhesion, vibration resistance, and excellent chemical properties. It can be used to fix the speaker magnet 30 and the diaphragm 60. In other embodiments, the fixation between the central region 61 of the diaphragm 60 and the top frame 522 can also be achieved using silicone adhesive. Silicone is an adhesive made primarily of silicon dioxide, which has advantages such as high temperature resistance, cold resistance, and weather resistance. It is also flexible and can absorb vibration and noise, providing better fixation and vibration resistance. The above solution can improve the stability of the bonding between the diaphragm 60 and the cylindrical magnetic rod 50, and at the same time help prevent the cylindrical magnetic rod 50 from shifting and colliding with the magnet 30.

[0037] Continue reading Figure 1 , Figure 5 , Figure 6 , Figure 7 and Figure 10In some embodiments, the top shell 52 includes an intermediate connecting frame 523, with one end of each top frame 522 away from the outer peripheral frame 521 connected to the intermediate connecting frame 523. For example, six top frames 522 are provided, with one end of each of the six top frames 522 away from the outer peripheral frame 521 connected to the intermediate connecting frame 523. Figure 6 As shown, the middle connecting frame 523 is opposite to the top of the magnet 30. The middle connecting frame 523, the outer peripheral frame 521 and the two adjacent top supports 20 enclose a top hollow area 511. The top hollow area 511 can reduce production costs and the weight of the cylindrical magnetic rod 50.

[0038] See Figure 1 , Figure 5 , Figure 6 , Figure 7 and Figure 10 In some embodiments, the intermediate connecting frame 523 extends vertically toward and is spaced from the magnet 30. The principle behind this spacing between the intermediate connecting frame 523 and the magnet 30 primarily involves electromagnetic induction and magnetic circuit design. When the intermediate connecting frame 523 moves in a changing magnetic field, an electromotive force (EMF) is generated within it, thus producing a current. With the magnetic guide rod spaced from the magnet 30, when the magnetic field of the magnet 30 changes, the magnetic flux in the cylindrical magnetic guide rod 50 also changes, generating an EMF and current within it. This current generation and change further influence the change in the magnetic field, forming a closed-loop electromagnetic induction process. The cylindrical magnetic guide rod 50 is typically used to guide and concentrate magnetic fields, improving equipment efficiency and performance. (See also...) Figure 1 and Figure 6 In some embodiments, a groove 5231 is provided on the side of the intermediate connecting frame 523 away from the magnet 30, and a through hole 5231a is formed at the bottom of the groove 5231 near the magnet 30. The setting of the through hole 5231a can further reduce the production cost of the moving iron speaker 10. The diaphragm 60 is connected to the side of the intermediate connecting frame 523 away from the magnet 30, and the diaphragm 60 covers the groove 5231, which can further reduce the production cost of the moving iron speaker 10 and the weight of the cylindrical magnetic rod 50.

[0039] See Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7 , Figure 6This is a schematic diagram of the cylindrical magnetic rod 50 of the moving iron horn 10 provided in one embodiment of this application. In some embodiments, the side of the intermediate connecting frame 523 away from the magnet 30 has an arc-shaped structure 5232. Since the diaphragm 60 has an arc-shaped structure 5232 at the corresponding position, setting the side of the intermediate connecting frame 523 away from the magnet 30 to an arc-shaped structure 5232 makes it easier for the diaphragm 60 and the intermediate connecting frame 523 of the cylindrical magnetic rod 50 to fit together. In some embodiments, the shape of the middle region of the diaphragm 60 matches the arc-shaped structure 5232. The central region 61 of the diaphragm 60 is fixed to the top frame 522, which can improve the stability of the bonding between the diaphragm 60 and the cylindrical magnetic rod 50, and at the same time help prevent the cylindrical magnetic rod 50 from shifting and colliding with the magnet 30, thus ensuring the normal use of the moving iron horn 10. In some embodiments, the vertical distance between the intermediate connecting frame 523 and the magnet 30 is greater than the vertical distance between the side shell 53 and the bracket 20, which can prevent the cylindrical magnetic rod 50 from directly colliding with the magnet 30 and being attracted, and ensure that the cylindrical magnetic rod 50 and the magnet 30 always maintain a distance in the vertical direction.

[0040] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7 In some embodiments, the cutout area 51 includes a side cutout area 51251, and the side shell 53 includes a plurality of side skeletons 5121. In some embodiments, the number of top skeletons 522 and side skeletons 5121 is the same; for example, the side shell 53 includes six side skeletons 5121, which are configured to be the same size. The side skeletons 5121 are connected to the outer peripheral skeleton 521, and the plurality of side skeletons 5121 are arranged circumferentially spaced, forming a side cutout area 51251 between adjacent skeletons, which can further reduce production costs and the weight of the cylindrical magnetic rod 50. The side skeletons 5121 are opposite to the radial side of the magnet 30, and in some embodiments, the various side skeletons 5121 form a temporary magnet with the same magnetic force.

[0041] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7In some embodiments, the side frame 5121 extends vertically along the magnet 30 and is parallel to the outer surface of the magnet 30. A bend 5121a is connected to the end of the side frame 5121 away from the top shell 52. The bend 5121a is perpendicular to the side frame 5121. In some embodiments, the distance between the bottom end of the groove 5231 of the cylindrical magnetic rod 50 near the magnet 30 and the top end of the magnet 30 near the groove 5231 is greater than the distance between the bend 5121a of the side frame 5121 and the bottom support 20, preventing the groove 5231 of the cylindrical magnetic rod 50 from being attracted to the magnet 30 in extreme cases.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A moving iron horn, characterized in that, The device includes a support, a magnet, a voice coil, a magnetic rod, and a diaphragm. The magnet is fixed to the support, the voice coil is wound around the magnet, the diaphragm is connected between the magnetic rod and the support, the magnetic rod surrounds the outside of the magnet and is spaced apart from the magnet, and multiple hollow areas are formed on the magnetic rod. The magnetic rod can move vertically under the influence of the magnetic field generated by the magnet and the voice coil.

2. The moving iron horn according to claim 1, characterized in that, The magnetic rod includes a top shell and a side shell. The top shell includes an outer peripheral frame and multiple top frames. The side shell and the top frames are both connected to the outer peripheral frame. The hollow area includes a top hollow area. The multiple top frames are arranged circumferentially to form the top hollow area between adjacent top frames.

3. The moving iron horn according to claim 2, characterized in that, The top frame has an arc-shaped structure, and the shape of the central region of the diaphragm is adapted to the shape of the top frame. The central region of the diaphragm is fixed to the top frame.

4. The moving iron horn according to claim 2, characterized in that, The top shell includes a middle connecting frame, and one end of each top skeleton away from the outer peripheral skeleton is connected to the middle connecting frame. The middle connecting frame is opposite to the top of the magnet, and the middle connecting frame, the outer peripheral skeleton, and two adjacent top skeletons enclose a top hollow area.

5. The moving iron horn according to claim 4, characterized in that, The intermediate connecting frame extends toward the magnet along the vertical direction of the magnet and is spaced apart from the magnet.

6. The moving iron horn according to claim 5, characterized in that, The intermediate connecting frame has a groove on the side away from the magnet, and a through hole is formed at the bottom of the groove on the side near the magnet. The diaphragm is connected to the side of the intermediate connecting frame away from the magnet and covers the groove.

7. The moving iron horn according to claim 5, characterized in that, The intermediate connecting frame has an arc-shaped structure on the side away from the magnet, the shape of the middle area of ​​the diaphragm is adapted to the arc-shaped structure, and the central area of ​​the diaphragm is fixed to the top frame.

8. The moving iron horn according to claim 5, characterized in that, The vertical distance between the intermediate connecting frame and the magnet is greater than the vertical distance between the side shell and the support.

9. The moving iron horn according to claim 2, characterized in that, The hollow area includes a side hollow area, and the side shell includes multiple side skeletons. The side skeletons are connected to the outer peripheral skeleton. The multiple side skeletons are spaced apart circumferentially, and the side hollow area is formed between adjacent skeletons. The side skeletons are opposite to the radial side surface of the magnet.

10. The moving iron horn according to claim 9, characterized in that, The side frame extends vertically along the magnet and is parallel to the outer surface of the magnet; a bent portion is connected to one end of the side frame away from the top shell, and the bent portion is perpendicular to the side frame; the number of top frames and side frames is the same, and the outer peripheral frame has a circular ring structure.

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