Horn double-magnetic-circuit structure

Abstract

The utility model provides a double-magnetic-circuit structure of a loudspeaker, which comprises a T iron, the T iron comprises a core column and a bottom plate, the core column is arranged on the bottom plate, and an inner magnet is arranged at the end part, far away from the bottom plate, of the core column; the core column and the inner magnet are sleeved with an outer magnet; magnetic conductive plate groups are arranged at the end parts, far away from the T iron, of the inner magnet and the outer magnet; the concentrating flux plate group, the inner magnet, the outer magnet and the T iron are positioned on the same axis; central holes are formed in the axes of the concentrating flux plate group, the inner magnet and the T iron; and the apertures of the central holes of the concentrating flux plate group, the inner magnet and the T iron are the same. The center holes formed in the concentrating flux plate set, the inner magnet and the T iron along the axis serve as heat dissipation channels, air circulation can be increased, heat generated by the inner magnet can be conducted and dissipated through the T iron and can also be transmitted out through air convection of the center holes, and the heat dissipation effect of the inner magnetic circuit is improved. And the central hole also ensures smooth airflow of the inner magnetic circuit, so that wind noise interference is reduced, and the purity of audio signals is improved.

Description

Technical Field

[0001] The utility model relates to a double-magnetic-circuit loudspeaker, in particular to a double-magnetic-circuit structure of a loudspeaker. Background Art

[0002] Among existing audio equipment, dual-magnetic circuit speakers are widely used in high-end audio systems due to their unique sound quality. However, when these speakers are operated at high power for long periods of time, heat dissipation within the internal magnetic circuit and wind noise interference from airflow become two major challenges that hinder their performance. For example, a high-end home theater system uses dual-magnetic circuit speakers as the main speakers. During actual use, as playback time increases and volume increases, the heat generated by electromagnetic conversion in the internal magnetic circuit increases dramatically, causing the temperature of the magnet to rise, which in turn affects the magnetic performance and sound quality stability. At the same time, during high-power playback, wind noise interference caused by the rapid flow of air through the internal magnetic circuit gradually becomes apparent, affecting the purity of the audio signal. Utility Model Content

[0003] The purpose of the utility model is to provide a speaker with a dual-magnetic circuit structure, and the technical problem to be solved is the heat dissipation and wind noise interference of the dual-magnetic circuit speaker.

[0004] The utility model is achieved through the following technical solutions:

[0005] The speaker has a dual magnetic circuit structure, including a T-iron, wherein the T-iron includes a core column and a base plate, the core column is arranged on the base plate, and an inner magnet is arranged at the end of the core column away from the base plate;

[0006] The outer magnet is sleeved on the core column and the inner magnet;

[0007] A magnetic plate group is provided at the ends of the inner magnet and the outer magnet away from the T iron;

[0008] The magnetic plate group, inner magnet, outer magnet and T iron are located on the same axis;

[0009] A central hole is formed on the axis of the magnetic conductive plate group, the inner magnet and the T-iron. The central holes of the magnetic conductive plate group, the inner magnet and the T-iron have the same aperture.

[0010] The above-mentioned T-iron serves as a supporting component of the entire magnetic circuit structure. The inner magnet and the outer magnet are sleeved on the core column to form a double-layer magnet. The double-layer magnet has the advantages of both internal and external magnetic speakers, with enhanced magnetic flux density and reduced leakage flux. Since the inner and outer magnets are sleeved on the core column and the inner and outer magnets are located on the same axis, the magnetic field distribution is symmetrical, thereby improving the sensitivity of the speaker while reducing the distortion of the sound waves. The center hole opened along the axis on the magnetic conductive plate group, the inner magnet and the T-iron serves as a heat dissipation channel, which can increase air circulation, so that the heat generated by the inner magnet can not only be dissipated through conduction through the T-iron, but also be transferred out through air convection in the center hole, thereby improving the heat dissipation effect of the internal magnetic circuit. The center hole also ensures smooth airflow in the internal magnetic circuit, thereby reducing wind noise interference and improving the purity of the audio signal.

[0011] Furthermore, a gap is left between the outer magnet and the core column, and the gap forms a first magnetic air gap;

[0012] A gap is left between the outer magnet and the inner magnet, and the gap forms a second magnetic air gap;

[0013] The axes of the first magnetic air gap and the second magnetic air gap coincide with each other.

[0014] The above-mentioned magnetic air gap is the space in the magnetic field that is not occupied by magnetized material, allowing the magnetic field lines to pass freely through it; in the dual magnetic circuit design, the existence of the first magnetic air gap (between the outer magnet and the core column) and the second magnetic air gap (between the outer magnet and the inner magnet) causes the magnetic field lines to undergo specific distribution and changes when passing through these areas, thereby adjusting the magnetic field characteristics of the speaker; the axes of the above-mentioned first magnetic air gap and the second magnetic air gap coincide, which means that the entire magnetic circuit system maintains a high degree of coaxiality, which helps to reduce vibration and noise caused by misalignment or offset between components, and improve the purity and stability of the sound; the magnetic air gaps with coincident axes make the distribution of magnetic field lines in the magnetic circuit more uniform and consistent, which is conducive to the smooth movement of the voice coil in the magnetic field and reduces the nonlinear distortion caused by uneven magnetic field.

[0015] Furthermore, the orthographic projection of the inner magnet on the bottom plate coincides with the orthographic projection of the core column on the bottom plate.

[0016] Since the axes of the first and second magnetic air gaps coincide, and the orthographic projections of the inner magnet and the core column coincide, the gaps of the first and second magnetic air gaps are equal, and the magnetic field lines encounter the same obstruction when passing through the first and second magnetic air gaps, which helps to maintain the uniformity of the magnetic field and reduce the nonlinear distortion and sound distortion caused by the uneven magnetic field; the uniform magnetic field distribution helps to optimize the vibration characteristics of the voice coil, so that it can respond to audio signals more accurately, improve the clarity, dynamic range and timbre of the sound, and enable the speaker to present a more realistic and natural sound quality; the inner magnet and the core column are aligned in the vertical direction, which helps to reduce the vibration and noise caused by misalignment or offset between components and improve the stability of the entire magnetic circuit system.

[0017] Furthermore, the external magnets extend out of the outer side walls of the bottom plate and the magnetic conductive plate assembly.

[0018] The above-mentioned external magnet extends beyond the outer wall of the bottom plate and the magnetic conductive plate group, which means that more magnetic material is involved in the formation of the magnetic field; it helps to enhance the magnetic field strength of the speaker, so that the voice coil can obtain greater driving force in the magnetic field, thereby improving the sound pressure level and dynamic range of the speaker; the external magnet extends beyond the outer wall of the bottom plate and the magnetic conductive plate group, which actually increases the contact area between the magnet and the external environment. The heat generated by the external magnet is dissipated into the air through the surface of the external magnet, thereby improving the heat dissipation performance of the external magnetic circuit.

[0019] Furthermore, the magnetic conductive plate group includes an inner magnetic conductive plate and an outer magnetic conductive plate, and the central hole is provided on the inner magnetic conductive plate;

[0020] The outer magnetic conductive plate is sleeved outside the inner magnetic conductive plate, and a gap is left between the outer magnetic conductive plate and the inner magnetic conductive plate, and the gap forms a third magnetic air gap;

[0021] The outer magnetic conductive plate is in contact with the outer magnet, and the inner magnetic conductive plate is in contact with the inner magnet.

[0022] Since the above-mentioned outer magnetic conductive plate is in direct contact with the external magnet, and the inner magnetic conductive plate is in direct contact with the inner magnet, the magnetic field of the magnet is more effectively transferred to the magnetic conductive plate group, ensuring the stability of the magnetic field of the entire magnetic circuit system; the above-mentioned third magnetic air gap forms an air channel, promotes air flow, further accelerates the dissipation of heat, and improves the heat dissipation efficiency.

[0023] Furthermore, the outer wall of the inner magnetic conductive plate extends beyond the outer wall of the inner magnet;

[0024] The inner side wall of the outer magnetic conductive plate extends out of the inner side wall of the outer magnet.

[0025] The extension of the outer wall of the inner magnetic plate allows the magnetic field of the inner magnet to be more effectively transferred to the inner magnetic plate, thereby enhancing the magnetic field strength of the entire magnetic circuit system. Similarly, the extension of the inner wall of the outer magnetic plate also helps to better guide the magnetic field of the outer magnet to the voice coil area.

[0026] Furthermore, the end surface of the inner magnet away from the core column and the end surface of the outer magnet away from the bottom plate are in the same horizontal plane.

[0027] By designing the end faces of the inner magnet and the outer magnet away from the T-iron to be on the same horizontal plane, the symmetry of the magnetic field in the horizontal direction is ensured, which helps to reduce the unevenness of the magnetic field during transmission, so that the voice coil can be subjected to a more stable and uniform magnetic field during the vibration process; the symmetrical magnetic field distribution helps to improve the frequency response characteristics of the speaker, making the sound performance of the speaker at different frequencies more balanced and natural, and reducing the frequency response deviation caused by the uneven magnetic field.

[0028] Furthermore, the height of the outer magnetic conductive plate is smaller than the height of the inner magnetic plate.

[0029] Since the height of the outer magnetic conductive plate is relatively low, it focuses the magnetic field to a certain extent; this means that the magnetic field lines may be more concentratedly directed toward the voice coil area when passing through the outer magnetic conductive plate, thereby enhancing the magnetic field strength at the voice coil.

[0030] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0031] The above-mentioned T-iron serves as a supporting component of the entire magnetic circuit structure. The inner magnet and the outer magnet are sleeved on the core column to form a double-layer magnet. The double-layer magnet has the advantages of both internal and external magnetic speakers, with enhanced magnetic flux density and reduced leakage flux. Since the inner and outer magnets are sleeved on the core column and the inner and outer magnets are located on the same axis, the magnetic field distribution is symmetrical, thereby improving the sensitivity of the speaker while reducing the distortion of the sound waves. The center hole opened along the axis on the magnetic conductive plate group, the inner magnet and the T-iron serves as a heat dissipation channel, which can increase air circulation, so that the heat generated by the inner magnet can not only be dissipated through conduction through the T-iron, but also be transferred out through air convection in the center hole, thereby improving the heat dissipation effect of the internal magnetic circuit. The center hole also ensures smooth airflow in the internal magnetic circuit, thereby reducing wind noise interference and improving the purity of the audio signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0033] Figure 1 A cross-sectional view of the overall structure.

[0034] Markings and corresponding parts names in the accompanying drawings:

[0035] 10. T iron; 11. Bottom plate; 12. Core column; 20. Inner magnet; 30. Outer magnet; 40. Magnetic conductive plate group; 41. Inner magnetic conductive plate; 42. Outer magnetic conductive plate; 51. First magnetic air gap; 52. Second magnetic air gap; 53. Third magnetic air gap; 60. Center hole. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The schematic implementation methods of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0037] Example 1:

[0038] Combine Figure 1 The present embodiment 1 provides a speaker dual magnetic circuit structure, including a T-iron 10, wherein the T-iron 10 includes a core 12 and a bottom plate 11, wherein the core 12 is disposed on the bottom plate 11, and an inner magnet 20 is disposed at the end of the core 12 away from the bottom plate 11;

[0039] The outer magnet 30 is sleeved on the core column 12 and the inner magnet 20;

[0040] A magnetic conductive plate assembly 40 is provided at the ends of the inner magnet 20 and the outer magnet 30 away from the T iron 10;

[0041] The magnetic plate assembly 40, the inner magnet 20, the outer magnet 30 and the T-iron 10 are located on the same axis;

[0042] A central hole 60 is formed on the axis of the magnetic conductive plate group 40 , the inner magnet 20 and the T-iron 10 . The central holes 60 of the magnetic conductive plate group 40 , the inner magnet 20 and the T-iron 10 have the same diameter.

[0043] To increase the intensity of the generated magnetic field and the magnetic conductivity, the following materials can be selected to make the components: the inner magnet 20 uses rare earth neodymium magnets, the outer magnet 30 uses ferrite magnets, and the T-iron 10 and the magnetic plate group 40 use low-carbon steel; in actual applications, heat sinks or heat dissipation slots can be designed at the bottom or around the T-iron 10 to further increase the heat dissipation area and air circulation, thereby improving the heat dissipation performance.

[0044] The T-iron 10 serves as a supporting component of the entire magnetic circuit structure. The inner magnet 20 and the outer magnet 30 are sleeved on the core column 12 to form a double-layer magnet. The double-layer magnet has the advantages of both internal and external magnetic speakers, with enhanced magnetic flux density and reduced magnetic leakage. Since the inner magnet 20 and the outer magnet 30 are sleeved on the core column 12 and are located on the same axis, the magnetic field distribution is symmetrical, thereby improving the sensitivity of the speaker while reducing the distortion of the sound waves. The center hole 60 opened along the axis on the magnetic plate group 40, the inner magnet 20 and the T-iron 10 serves as a heat dissipation channel, which can increase air circulation, so that the heat generated by the inner magnet 20 can not only be dissipated by conduction through the T-iron 10, but also be transferred out through air convection through the center hole 60, thereby improving the heat dissipation effect of the internal magnetic circuit. The center hole 60 also ensures smooth airflow in the internal magnetic circuit, thereby reducing wind noise interference and improving the purity of the audio signal.

[0045] The magnetic plate group 40, inner magnet 20, outer magnet 30 and T iron 10 are located on the same axis, reducing vibration and noise caused by misalignment or offset between components. A stable structure is the basis for reducing wind noise interference.

[0046] Example 2:

[0047] On the basis of embodiment 1, a gap is left between the outer magnet 30 and the core column 12, and the gap forms a first magnetic air gap 51;

[0048] A gap is left between the outer magnet 30 and the inner magnet 20, and the gap forms a second magnetic air gap 52;

[0049] The axes of the first magnetic air gap 51 and the second magnetic air gap 52 coincide with each other.

[0050] The above-mentioned magnetic air gap is the space in the magnetic field that is not occupied by magnetized material, allowing the magnetic field lines to pass freely through it; in the dual magnetic circuit design, the existence of the first magnetic air gap 51 (between the outer magnet 30 and the core column 12) and the second magnetic air gap 52 (between the outer magnet 30 and the inner magnet 20) causes the magnetic field lines to undergo specific distribution and changes when passing through these areas, thereby adjusting the magnetic field characteristics of the speaker; the axes of the above-mentioned first magnetic air gap 51 and the second magnetic air gap 52 coincide, which means that the entire magnetic circuit system maintains a high degree of coaxiality, which helps to reduce vibration and noise caused by misalignment or offset between components, and improve the purity and stability of the sound; the magnetic air gaps with coincident axes make the distribution of magnetic field lines in the magnetic circuit more uniform and consistent, which is conducive to the smooth movement of the voice coil in the magnetic field and reduces the nonlinear distortion caused by uneven magnetic field.

[0051] While the magnetic air gap itself doesn't directly contribute to the heat dissipation process, it can affect the air flow within the magnetic circuit system. A well-designed magnetic air gap helps optimize the heat dissipation path and improve heat dissipation efficiency. For example, adjusting the size and position of the magnetic air gap can optimize air flow around the magnets and promote heat dissipation. The impact of the magnetic air gap on wind noise interference is primarily reflected in its control of the vibration system. A coaxial and uniform magnetic air gap helps reduce noise caused by unstable vibration systems.

[0052] In a specific embodiment, the orthographic projection of the inner magnet 20 on the bottom plate 11 coincides with the orthographic projection of the core column 12 on the bottom plate 11 , and the orthographic projection of the first magnetic air gap 51 on the bottom plate 11 coincides with the orthographic projection of the second magnetic air gap 52 on the bottom plate 11 .

[0053] Since the axes of the first magnetic air gap 51 and the second magnetic air gap 52 coincide, and the orthographic projections of the inner magnet 20 and the core column 12 coincide, the gaps of the first magnetic air gap 51 and the second magnetic air gap 52 are equal, and the magnetic field lines encounter the same obstruction when passing through the first magnetic air gap 51 and the second magnetic air gap 52, which helps to maintain the uniformity of the magnetic field and reduce the nonlinear distortion and sound distortion caused by the uneven magnetic field; the uniform magnetic field distribution helps to optimize the vibration characteristics of the voice coil, so that it can respond to audio signals more accurately, improve the clarity, dynamic range and timbre of the sound, and enable the speaker to present a more realistic and natural sound quality; the inner magnet 20 and the core column 12 are aligned in the vertical direction, which helps to reduce the vibration and noise caused by misalignment or offset between components and improve the stability of the entire magnetic circuit system.

[0054] Since the inner magnet 20 and the core column 12 are coaxially arranged, the interaction force between the inner magnet 20 and the core column 12 is more uniform, reducing the risk of material fatigue and damage caused by stress concentration, and helping to extend the service life of the dual magnetic circuit structure.

[0055] Example 3:

[0056] In any of the above embodiments, the outer magnet 30 extends out of the outer side wall of the bottom plate 11 and the magnetic plate group 40.

[0057] The extension of the outer magnet 30 out of the outer side wall of the bottom plate 11 and the magnetic plate group 40 means that more magnet material is involved in the formation of the magnetic field; it helps to enhance the magnetic field strength of the loudspeaker, so that the voice coil can obtain greater driving force in the magnetic field, thereby improving the sound pressure level and dynamic range of the loudspeaker; the extension of the outer magnet 30 out of the outer side wall of the bottom plate 11 and the magnetic plate group 40 actually increases the contact area of the magnet with the external environment, and the heat generated by the outer magnet 30 is dissipated to the air through the surface of the outer magnet 30, improving the heat dissipation performance of the outer magnetic circuit.

[0058] The extended outer magnet 30 can also change the distribution pattern of the magnetic field. By adjusting the shape and size of the outer magnet 30, the distribution of the magnetic field inside the loudspeaker can be optimized, making the magnetic field lines more uniform and concentrated, reducing magnetic field leakage and interference, and improving the purity and clarity of the sound.

[0059] Embodiment 4:

[0060] On the basis of embodiment 2, the magnetic plate group 40 includes an inner magnetic plate 41 and an outer magnetic plate 42, and the center hole 60 is arranged on the inner magnetic plate 41.

[0061] The outer magnetic plate 42 is sleeved outside the inner magnetic plate 41, and a gap is left between the outer magnetic plate 42 and the inner magnetic plate 41, which forms a third magnetic air gap 53.

[0062] The outer magnetic plate 42 is in contact with the outer magnet 30, and the inner magnetic plate 41 is in contact with the inner magnet 20.

[0063] Since the outer magnetic plate 42 is in direct contact with the outer magnet 30, and the inner magnetic plate 41 is in direct contact with the inner magnet 20, the magnetic field of the magnet is more effectively transmitted to the magnetic plate group 40, ensuring the stability of the magnetic field of the entire magnetic circuit system; the third magnetic air gap 53 forms an air channel to promote air flow, further accelerating heat dissipation and improving heat dissipation efficiency.

[0064] In a specific embodiment, the outer side wall of the inner magnetic plate 41 extends out of the outer side wall of the inner magnet 20.

[0065] The inner side wall of the outer magnetic plate 42 extends out of the inner side wall of the outer magnet 30; and the gap of the third magnetic air gap 53 is smaller than that of the first magnetic air gap 51 and the second magnetic air gap 52.

[0066] The extension of the outer sidewall of the inner magnetic plate 41 allows the magnetic field of the inner magnet 20 to be more effectively transferred to the inner magnetic plate 41, thereby enhancing the magnetic field strength of the entire magnetic circuit system. Similarly, the extension of the inner sidewall of the outer magnetic plate 42 also helps to better guide the magnetic field of the outer magnet 30 to the voice coil area.

[0067] By adjusting the extension length of the inner and outer magnetic conductive plates 41 and 42 and changing the third magnetic air gap 53, the uniformity of the magnetic field can be further optimized. A uniform and stable magnetic field helps reduce the nonlinear distortion of the voice coil caused by magnetic field changes during vibration.

[0068] Example 5:

[0069] On the basis of the fourth embodiment, the end surface of the inner magnet 20 away from the core column 12 and the end surface of the outer magnet 30 away from the bottom plate 11 are in the same horizontal plane.

[0070] By designing the end faces of the inner magnet 20 and the outer magnet 30 away from the T-iron 10 to be on the same horizontal plane, the symmetry of the magnetic field in the horizontal direction is ensured, which helps to reduce the unevenness of the magnetic field during transmission, so that the voice coil can be subjected to a more stable and uniform magnetic field during the vibration process; the symmetrical magnetic field distribution helps to improve the frequency response characteristics of the speaker, making the sound performance of the speaker at different frequencies more balanced and natural, and reducing the frequency response deviation caused by the uneven magnetic field.

[0071] In a specific embodiment, the height of the outer magnetic conductive plate 42 is smaller than the height of the inner magnetic plate.

[0072] Since the height of the outer magnetic conductive plate 42 is relatively low, it focuses the magnetic field to a certain extent; this means that the magnetic field lines may be more concentratedly directed to the voice coil area when passing through the outer magnetic conductive plate 42, thereby enhancing the magnetic field strength at the voice coil; by adjusting the height difference between the inner and outer magnetic conductive plates 42, the timbre of the speaker can be adjusted to a certain extent. The lower outer magnetic conductive plate 42 makes the sound in the mid- and high-frequency bands more prominent, while the higher inner magnetic conductive plate 41 affects the sound in the low-frequency band.

[0073] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. The speaker has a dual magnetic circuit structure, characterized in that: The invention comprises a T-iron (10), wherein the T-iron (10) comprises a core column (12) and a bottom plate (11), wherein the core column (12) is arranged on the bottom plate (11), and an inner magnet (20) is arranged at an end of the core column (12) away from the bottom plate (11); An outer magnet (30) is sleeved on the core column (12) and the inner magnet (20); A magnetic conductive plate group (40) is provided at the ends of the inner magnet (20) and the outer magnet (30) away from the T iron (10); The magnetic plate group (40), the inner magnet (20), the outer magnet (30) and the T iron (10) are located on the same axis; A central hole (60) is provided on the axis of the magnetic conductive plate group (40), the inner magnet (20) and the T-iron (10), and the central holes (60) of the magnetic conductive plate group (40), the inner magnet (20) and the T-iron (10) have the same aperture.

2. The speaker dual magnetic circuit structure according to claim 1, characterized in that: A gap is left between the outer magnet (30) and the core column (12), and the gap forms a first magnetic air gap (51); A gap is left between the outer magnet (30) and the inner magnet (20), and the gap forms a second magnetic air gap (52); The axes of the first magnetic air gap (51) and the second magnetic air gap (52) coincide with each other.

3. The speaker dual magnetic circuit structure according to claim 2, characterized in that: The orthographic projection of the inner magnet (20) on the bottom plate (11) coincides with the orthographic projection of the core column (12) on the bottom plate (11).

4. The speaker dual magnetic circuit structure according to claim 1, characterized in that: The external magnet (30) extends out of the outer side walls of the bottom plate (11) and the magnetic conductive plate group (40).

5. The speaker dual magnetic circuit structure according to claim 3, characterized in that: The magnetic conductive plate group (40) includes an inner magnetic conductive plate (41) and an outer magnetic conductive plate (42), and the central hole (60) is provided on the inner magnetic conductive plate (41); The outer magnetic conductive plate (42) is sleeved outside the inner magnetic conductive plate (41), and a gap is left between the outer magnetic conductive plate (42) and the inner magnetic conductive plate (41), and the gap forms a third magnetic air gap (53); The outer magnetic conductive plate (42) contacts the outer magnet (30), and the inner magnetic conductive plate (41) contacts the inner magnet (20).

6. The speaker dual magnetic circuit structure according to claim 5, characterized in that: The outer wall of the inner magnetic conductive plate (41) extends beyond the outer wall of the inner magnet (20); The inner side wall of the outer magnetic conductive plate (42) extends beyond the inner side wall of the outer magnet (30).

7. The speaker dual magnetic circuit structure according to claim 1, characterized in that: The end surface of the inner magnet (20) away from the core column (12) and the end surface of the outer magnet (30) away from the bottom plate (11) are in the same horizontal plane.

8. The speaker dual magnetic circuit structure according to claim 7, characterized in that: The height of the outer magnetic conductive plate (42) is smaller than that of the inner magnetic plate.

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