Strong sound transducer and design method

Abstract

The invention relates to the technical field of security and protection monitoring, and particularly discloses a strong sound transducer and a design method.The transducer comprises an electromagnetic compression driver, the electromagnetic compression driver comprises a magnetic circuit and a vibration component, the magnetic circuit is of an inner magnetic structure and comprises an upper pole plate, a permanent magnet and a lower pole plate, the vibration component comprises a vibrating diaphragm, a voice coil and a voice coil framework, the vibrating diaphragm is in an annular V shape, and the permanent magnet is arranged on the upper pole plate; a polyester high polymer material is adopted, a voice coil framework is made of a polyimide film material, and a winding of the voice coil adopts a double-layer copper-clad aluminum wire. The horn sounding ports comprise a pipe plug, a throat opening, a horn and a horn opening and are used as sound wave outlet channels; the folding ring comprises an inner folding ring and an outer folding ring and is integrally formed with the vibrating diaphragm; and the magnetic conductive piece comprises a magnetic conductive plate, a magnetic conductive yoke, a magnetic conductive sheet and a gasket. According to the invention, the electromagnetic compression driver and the horn sounding port are effectively combined, and the output power and the output efficiency of the transducer are improved by utilizing the characteristic that the electromagnetic compression driver is easy to realize high power and the characteristic that the horn sounding port is good in impedance matching.

Description

Technical Field

[0001] The present invention relates to the technical field of security monitoring, and particularly relates to a high-intensity sound transducer and a design method. Background Art

[0010] The high-intensity sound transducer is a key component for generating strong acoustic noise, and its performance determines the maximum sound pressure level technical index of the system.

[0011] Currently, the types that can be used as high-intensity sound transducers generally include piezoelectric transducers and electromagnetic transducers. According to the analysis of the working principle and characteristics of the transducers, the sound pressure level and frequency response range of a single electromagnetic transducer are much better than those of a piezoelectric transducer, and it is easier for an electromagnetic transducer to achieve high power.

[0012] The horn is a sound tube with a continuously diverging wavefront. The horn provides a good match between the diaphragm and the air, increases the radiation resistance, and improves the conversion efficiency. Different from ordinary direct-radiation transducers, the horn transducer has a good acoustic impedance match. The acoustic impedance of the horn is directly applied to the diaphragm as a load. The difference between the diaphragm area and the horn throat area forms a large compression ratio, which increases the load acoustic impedance of the diaphragm. When the force impedance of the diaphragm is close to the acoustic impedance of the diaphragm, the impedance match is the best, the output power is the largest, and the output efficiency is high.

[0013] Based on this technical background, the present invention studies a high-intensity sound transducer and a design method. Summary of the Invention

[0014] Aiming at the deficiencies of the prior art, the present invention provides a high-intensity sound transducer and a design method. The transducer effectively combines an electromagnetic compression driver with a horn sound outlet, and utilizes the characteristics of the electromagnetic compression driver being easy to achieve high power and the good impedance match of the horn sound outlet to improve the output power and output efficiency of the transducer.

[0015] It provides a good match between the diaphragm and the air, increases the radiation resistance, and improves the conversion efficiency. Different from ordinary direct-radiation transducers, the horn transducer has a good acoustic impedance match. The acoustic impedance of the horn is directly applied to the diaphragm as a load. The difference between the diaphragm area and the horn throat area forms a large compression ratio, which increases the load acoustic impedance of the diaphragm. When the force impedance of the diaphragm is close to the acoustic impedance of the diaphragm, the impedance match is the best, the output power is the largest, and the output efficiency is high.

[0016] To achieve the above object, the first aspect of the present invention provides a high-intensity sound transducer, including:

[0017] Electromagnetic compression driver, comprising a magnetic circuit and a vibrating component, the magnetic circuit adopting an internal magnetic structure, including an upper pole plate, a permanent magnet and a lower pole plate, the vibrating component including a diaphragm, a voice coil and a voice coil bobbin, the diaphragm being in a circular V shape and made of a polyester polymer material, the voice coil bobbin being made of a polyimide film material, and the winding of the voice coil being made of double-layer copper-clad aluminum wire;

[0018] A pair of horn sound outlets, including a throat plug, a throat, a horn and a horn mouth, serving as a sound wave outlet channel;

[0019] A folding ring, including an inner folding ring and an outer folding ring, integrally formed with the diaphragm for fixing the diaphragm;

[0020] A magnetic conductive member, including a magnetic conductive plate, a magnetic yoke, magnetic conductive sheets and washers.

[0021] The second aspect of the present invention provides a design method for the above transducer, including:

[0022] Taking a pair of horn sound outlets as the sound wave outlet channel of the electromagnetic compression driver to improve the overall maximum sound pressure level and output sound wave frequency range of the transducer;

[0023] By using the method of modeling analysis, selecting the structure of the magnetic circuit, determining the shape and size of the compression cavity, designing and optimizing the diaphragm shape, and then determining the optimal compression ratio and sensitivity.

[0024] The beneficial effects of the present invention include:

[0025] (1) For the high-intensity sound transducer proposed by the present invention, the electromagnetic compression driver and the horn sound outlet are effectively combined. By utilizing the characteristics that the electromagnetic compression driver is easy to achieve high power and the horn sound outlet has good impedance matching, the output power and output efficiency of the transducer are improved.

[0026] (2) For the high-intensity sound transducer proposed by the present invention, the difference between the diaphragm area of the electromagnetic compression driver and the throat area of the horn sound outlet forms a large compression ratio, which increases the load acoustic impedance of the diaphragm. When the force impedance of the diaphragm is close to the acoustic impedance of the diaphragm, the impedance matching is the best, the output power is the largest, and the output efficiency is high.

[0027] (3) For the design method of the high-intensity sound transducer proposed by the present invention, by using the method of modeling analysis, selecting the structure of the magnetic circuit, determining the shape and size of the compression cavity, designing and optimizing the diaphragm shape, and then determining the optimal compression ratio and sensitivity, the design efficiency of the high-intensity sound transducer is improved, providing a theoretical guarantee for improving the output power and output efficiency of the transducer.

[0028] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. Description of the Drawings

[0029] The above and other objects, features, and advantages of the present invention will become more apparent by describing the exemplary embodiments of the present invention in more detail with reference to the accompanying drawings.

[0030] Figure 1 It is a schematic diagram of the overall structure of the high-intensity sound transducer proposed by the present invention.

[0031] Figure 2 It is a schematic cross-sectional view of the structure of a specific embodiment of the high-intensity sound transducer proposed by the present invention.

[0032] Figure 3 It is an exploded schematic diagram of the structural components of a specific embodiment of the high-intensity sound transducer proposed by the present invention.

[0033] Figure 4 It is a schematic comparison diagram of the magnetic circuit structures of the inner magnetic type, outer magnetic type, and radiation type in a specific embodiment of the high-intensity sound transducer proposed by the present invention.

[0034] Figure 5 It is a two-dimensional cross-sectional schematic diagram of the inner magnetic type magnetic circuit structure in a specific embodiment of the high-intensity sound transducer proposed by the present invention.

[0035] Figure 6 It is a three-dimensional model schematic diagram of the inner magnetic type magnetic circuit structure in a specific embodiment of the high-intensity sound transducer proposed by the present invention. Specific Embodiment

[0036] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein.

[0037] The present invention provides a high-intensity sound transducer, as Figure 1 shown, comprising:

[0038] An electromagnetic compression driver, comprising a magnetic circuit and a vibrating component. The magnetic circuit adopts an inner magnetic type structure, including an upper pole plate, a permanent magnet, and a lower pole plate. The vibrating component includes a diaphragm, a voice coil, and a voice coil bobbin. The diaphragm is in a circular V shape and is made of a polyester polymer material. The voice coil bobbin is made of a polyimide film material. The winding of the voice coil uses double-layer copper-clad aluminum wire;

[0039] A pair of horn sound outlets, including a throat plug, a throat opening, a horn, and a horn opening, serving as a sound wave outlet channel;

[0040] A surround, including an inner surround and an outer surround, integrally formed with the diaphragm for fixing the diaphragm;

[0041] A magnetic conductive member, including a magnetic conductive plate, a magnetic yoke, magnetic conductive sheets, and washers.

[0042] In the present invention, an electromagnetic compression driver is effectively combined with a horn sound outlet. By utilizing the characteristics of the electromagnetic compression driver that it is easy to achieve high power, and the characteristics of the horn sound outlet with good impedance matching, the output power and output efficiency of the transducer are improved.

[0043] In the present invention, through the analysis of the equivalent circuit of the high-intensity sound transducer system and the electro-acoustic conversion efficiency, it is determined that the electromagnetic compression driver must be used in combination with the horn. The horn-type sound transducer has high efficiency due to the impedance matching of the diaphragm and the space.

[0044] According to the present invention, the magnetic circuit is in a circular ring shape. The permanent magnet is placed between the upper pole plate and the lower pole plate, and its axis coincides with the axisymmetric center of the circular ring. The magnetization direction is parallel to the axisymmetric center.

[0045] Both the upper pole plate and the lower pole plate are made of soft magnetic materials and are evenly distributed at both poles of the permanent magnet.

[0046] According to the present invention, the selection method of the magnetic circuit structure includes:

[0047] Through preliminary calculation and analysis using finite element multi-physics field simulation analysis software, physical models of various magnetic circuit structures are established using the same permanent magnet material and magnetic conductive plate material, and simulation calculations are carried out to obtain the finite element models of each magnetic circuit structure.

[0048] Perform analysis on the magnetic field intensity and sensitivity of the magnetic gap for the finite element models of various magnetic circuit structures, and select the magnetic circuit structure with more uniform magnetic flux density in the magnetic gap, less material used for the permanent magnet and the magnetic conductive plate.

[0049] In the present invention, the magnetic circuit is a component for the electromagnetic compression-driven sound transducer to achieve electro-mechanical conversion, and is an indispensable part in the entire electro-mechanical-acoustic conversion process of the transducer. The design result of the magnetic circuit part will directly affect aspects such as the achievable degree of the rated power of the transducer, the level of electro-acoustic energy conversion efficiency, the quality of the sound output frequency response, and the magnitude of harmonic distortion.

[0050] According to the present invention, the electromagnetic compression driver further includes an upper housing, a phase plug center part, a phase plug base part, and a lower housing.

[0051] A compression cavity is formed between the diaphragm and the phase plug base part, and the compression cavity is a coupling cavity for realizing the regulation of the compression ratio parameter.

[0052] The phase plug center part and the phase plug base part jointly form a phase plug sound channel.

[0053] According to the present invention, the determination method of the shape and size of the compression cavity includes:

[0054] Based on the multi-physics field elements of the entire transducer, establish the overall physical model of the transducer.

[0055] Based on the overall physical model, precise calculation and analysis are carried out through multi-physics finite element simulation software. Based on the optimal compression ratio parameter value, the shape and size of the compression cavity are obtained.

[0056] The multi-physics elements include electric, magnetic, vibration, mechanical structure, and acoustic elements.

[0057] In the present invention, the compression ratio parameter is the key factor determining the electro-acoustic conversion efficiency. The compression cavity refers to the cavity between the transducer diaphragm and the phase plug. It is the coupling cavity for realizing the regulation of the compression ratio parameter, and its volume size also affects the compression ratio. The design of the compression cavity and the compression ratio involves multi-physics elements such as electric, magnetic, vibration, mechanical structure, and sound of the entire transducer. Therefore, based on the establishment of the overall physical model of the transducer, precise calculation and analysis should be carried out through multi-physics finite element simulation software, and finally the specific shape and size of the compression cavity are obtained to determine the optimal compression ratio parameter value.

[0058] Preferably, the design methods of the diaphragm shape include:

[0059] Adopt the finite element analysis method to analyze and compare the static and dynamic characteristics of the diaphragm. Through preliminary analysis, it is determined that the diaphragm is in a ring-shaped V shape.

[0060] Establish a model of the vibrating component, conduct static analysis and modal analysis, and use the finite element method to optimize the structure of the ring-shaped V shape to obtain a diaphragm shape with high mechanical efficiency.

[0061] In the present invention, the core component of the electromagnetic compression-driven acoustic transducer is the vibrating component. The quality of the design of the vibrating component is related to the final result of the design of the entire transducer. The vibration system of the high-intensity acoustic transducer mainly includes the diaphragm, voice coil, and voice coil bobbin. The design mainly considers the shape of the diaphragm, the quality of the voice coil and the voice coil bobbin. The design of the diaphragm shape adopts the finite element analysis method to analyze and compare its static and dynamic characteristics. Through preliminary analysis, a ring-shaped V-shaped diaphragm is determined. Establish a model of the vibrating component for static analysis and modal analysis, and use the finite element method to optimize the structure of the V-line ring-shaped vibrating component, and a diaphragm shape with higher mechanical efficiency can be obtained. In addition, study the material of the voice coil, the voice coil bobbin and the winding structure, and analyze the design of the main parameters affecting the quality of the vibrating component.

[0062] According to the present invention, the polyimide film material is produced by Kapton Corporation.

[0063] A pair of horn sound outlets are formed by two horn sound outlets closely joined on a plane, which is used to improve the impedance matching between the overall diaphragm of the transducer and the space, thereby improving the efficiency.

[0064] In the present invention, a large compression ratio is formed by the difference between the diaphragm area of the electromagnetic compression driver and the throat area of the horn sound outlet, which increases the load acoustic impedance of the diaphragm. When the force impedance of the diaphragm is close to the acoustic impedance of the diaphragm, the impedance matching is the best, the output power is the largest, and the output efficiency is high.

[0065] The present invention also provides a design method for the above transducer, including:

[0066] Using a pair of horn sound outlets as the sound wave outlet channels of the electromagnetic compression driver to improve the overall maximum sound pressure level and the output sound wave frequency range of the transducer;

[0067] By using the method of modeling analysis, select the structure of the magnetic circuit, determine the shape and size of the compression cavity, design and optimize the diaphragm shape, and then determine the optimal compression ratio and sensitivity.

[0068] According to the present invention, using a pair of horn sound outlets as the sound wave outlet channels of the electromagnetic compression driver includes:

[0069] Closely splicing two horn sound outlets in a pair of horn sound outlets on a plane to form the sound wave outlet channel of the electromagnetic compression driver;

[0070] Selecting the structure of the magnetic circuit includes:

[0071] Through preliminary calculation and analysis using finite element multi-physics field simulation analysis software, using the same permanent magnet material and magnetic conductive plate material, establish physical models for various magnetic circuit structures, conduct simulation calculations, and obtain the finite element models of each magnetic circuit structure;

[0072] Analyze the magnetic field intensity and sensitivity of the magnetic gap for the finite element models of various magnetic circuit structures, and select the magnetic circuit structure with more uniform magnetic gap magnetic flux density and less material used for permanent magnets and magnetic conductive plates.

[0073] According to the present invention, determining the shape and size of the compression cavity includes:

[0074] Based on the multi-physics field elements of the entire transducer, establish the overall physical model of the transducer;

[0075] Based on the overall physical model, through precise calculation and analysis using multi-physics field finite element simulation software, and based on the optimal compression ratio parameter value, obtain the shape and size of the compression cavity;

[0076] The multi-physics field elements include electrical, magnetic, vibration, mechanical structure, and acoustic elements;

[0077] Designing and optimizing the diaphragm shape includes:

[0078] Using the finite element analysis method, analyze and compare the static and dynamic characteristics of the diaphragm. Through preliminary analysis, determine that the diaphragm is in a circular V shape;

[0079] A model of the vibration component was established, and static and modal analyses were performed. The finite element method was used to optimize the annular V-shape structure to obtain a diaphragm shape with high mechanical efficiency.

[0080] In the present invention, the modeling and analysis method is used to select the structure of the magnetic circuit, determine the shape and size of the compression chamber, design and optimize the diaphragm shape, and then determine the optimal compression ratio and sensitivity, thereby improving the design efficiency of the high-intensity sound transducer and providing a theoretical guarantee for improving the output power and output efficiency of the transducer.

[0081] The present invention will be described in more detail below by way of examples.

[0082] Embodiment 1:

[0083] like Figure 1 As shown, this embodiment proposes a strong sound transducer, which is developed using the principle of electromagnetic compression drive sound transducer. Based on the previous research results of strong sound transducer, the transducer magnetic circuit, vibration components and acoustic structure are accurately calculated by multi-physical field simulation calculation means to obtain the best physical parameters and predict the ideal indicators of the transducer.

[0084] In order to ensure that the prototype of the strong sound transducer reaches the overall technical indicators such as the maximum sound pressure level and the output sound wave frequency range, the array unit of the strong sound transducer can only use a horn-type transducer. The sound caliber of the horn is the key factor that determines the above two indicators. The design of the horn caliber should not be too small, which leads to the horn-type transducer array cannot meet the requirement that the array element spacing must meet λ / 2~λ / 4; therefore, only the solution of two horn sound ports closely spliced ​​on a plane can be adopted;

[0085] The electromagnetic compression driver is used in conjunction with the horn sound outlet. The horn sound transducer has high efficiency due to the impedance matching between the diaphragm and the space;

[0086] In this embodiment, the structural cross-sectional diagram of the strong sound transducer is as follows: Figure 2 As shown, Figure 3 It is an exploded schematic diagram of the structural components of the strong sound transducer;

[0087] Sensitivity and power are important indicators for evaluating the performance of electromagnetic compression-driven acoustic transducers. The magnetic flux density B of the transducer's magnetic gap is an important determining factor of its sensitivity and power. Therefore, maximizing the magnetic field strength of the magnetic gap is the main goal of magnetic circuit design. At the same time, the uniformity of the magnetic flux density in the magnetic gap and the height of the magnetic gap are factors affecting the degree of distortion of high-power transducers. Therefore, to reduce the distortion of the transducer and increase the power, it is necessary to increase the uniformity of the magnetic flux density in the magnetic gap and the height of the magnetic gap, and also to increase the magnetic field strength. Figure 4Figure a shows a schematic diagram of the internal magnetic circuit structure. In the internal magnetic circuit, the permanent magnet is placed at the axisymmetric center, and its magnetization direction is parallel to the axisymmetric line upward in the schematic diagram. The pole plates made of soft magnetic materials are distributed at both poles of the permanent magnet. Figure 4 Figure b shows a schematic diagram of the external magnetic circuit structure. In the external magnetic circuit, the pole plates are placed at the axisymmetric center of the structure, and the permanent magnets are surrounded by the poles. The magnetization direction is the same as that of the internal magnetic type. Figure 4 Figure c shows a schematic diagram of the radial magnetic circuit structure. The radial magnetic circuit is different from the previous two. The magnetization direction of its permanent magnet points to the axisymmetric center. In the figure, Lm is the dimension in the magnetization direction of the permanent magnet, and E is the height of the magnetic gap.

[0088] In this embodiment, Figure 5 、 Figure 6 are respectively the two-dimensional cross-sectional schematic diagram and the three-dimensional model schematic diagram of the internal magnetic circuit structure.

[0089] Not all three magnetic circuit structures are suitable for the electromagnetic compression-driven acoustic transducer. It is necessary to select a type of magnetic circuit that is most suitable for the electromagnetic compression-driven acoustic transducer for design. For the above three magnetic circuit structures, it is necessary to calculate the magnetic field magnitude in the magnetic gap under the conditions of the same magnetic gap size, the same permanent magnet material, and the permeable plate material to determine whether the magnetic field intensity in the magnetic gap meets the design requirements of the transducer power and sensitivity. Finally, select the magnetic circuit structure with more uniform magnetic flux density in the magnetic gap, less material consumption of the permanent magnet and the permeable plate.

[0090] Through the finite element multi-physics field simulation analysis software COMSOL, preliminary calculation and analysis are carried out. Using the same permanent magnet material and permeable plate material, physical models of the above three magnetic circuit structures are established, and simulation calculations are carried out to obtain the finite element models of the three magnetic circuit structures.

[0091] All three types of magnetic circuits can form a relatively dense magnetic induction intensity in the magnetic gap. The uniformity of the magnetic flux density in the magnetic gap of the radial magnetic circuit is the best, but the magnetic induction intensity in its magnetic gap is much lower than that in the magnetic gaps of the internal magnetic and external magnetic circuits. The sensitivity of its corresponding transducer is relatively low, and the manufacturing difficulty of this magnetic circuit structure is relatively large, the cost of die forming is relatively high, and the structure is easily damaged during product sintering. Therefore, it is not suitable for the transducer design with high requirements. In the region of relatively high magnetic induction intensity in the magnetic gap of the external magnetic circuit, the uniformity is worse than that of the internal magnetic circuit. The maximum magnetic field intensity of the external magnetic circuit is less than that of the internal magnetic circuit structure, and the required amount of magnetic material is more. Relatively speaking, the internal magnetic circuit is more suitable for the electromagnetic compression-driven acoustic transducer than the external magnetic circuit.

[0092] In summary, considering the same magnetic circuit volume and magnetic material properties, the magnetic induction intensity of the outer magnetic circuit magnetic gap is lower than that of the inner magnetic circuit, and the uniformity of the magnetic field intensity in the inner magnetic circuit air gap is better. Therefore, to obtain the same magnetic induction intensity of the magnetic gap, the inner magnetic circuit can reduce the usage of permanent magnetic materials and magnetic leakage. Through the above analysis, it can be seen that the inner magnetic circuit structure is more suitable to meet the same sensitivity and power requirements of the electromagnetic compression drive acoustic transducer;

[0093] The core component of the electromagnetic compression drive acoustic transducer is the vibration component. The quality of the vibration component design is related to the final result of the entire transducer design. The vibration system of the high-intensity acoustic transducer mainly includes the diaphragm, voice coil, and voice coil bobbin. When designing it, the shape of the diaphragm, the quality of the voice coil and voice coil bobbin are mainly considered. The shape design of the diaphragm uses the finite element analysis method to analyze and compare its static and dynamic characteristics. Through preliminary analysis, an annular V-shaped diaphragm is determined. A vibration component model is established for static analysis and modal analysis. The finite element method is used to optimize the structure of the V-line annular vibration component, and a diaphragm shape with higher mechanical efficiency can be obtained. In addition, study the material of the voice coil, the voice coil bobbin and the winding structure, and analyze the design of the main parameters affecting the quality of the vibration component;

[0094] The diaphragm is planned to use polyester polymer material, the voice coil bobbin uses Kapton material with good stiffness and heat dissipation performance, the voice coil winding uses double-layer copper-clad aluminum wire, and the surround is integrally formed with the diaphragm. The vibration component fixes the diaphragm through two surrounds inside and outside, and the voice coil is connected to the diaphragm;

[0095] The compression ratio parameter is the key factor determining the electro-acoustic conversion efficiency. The compression cavity refers to the cavity between the transducer diaphragm and the phase plug. It is the coupling cavity for realizing the regulation of the compression ratio parameter, and its volume size will also affect the compression ratio. The design of the compression cavity and compression ratio involves multiple physical field elements such as electricity, magnetism, vibration, mechanical structure, and sound of the entire transducer. Therefore, based on the establishment of the overall physical model of the transducer, precise calculation and analysis should be carried out through multi-physical field finite element simulation software to finally obtain the specific shape and size of the compression cavity and determine the optimal compression ratio parameter value;

[0096] In summary, the electro-acoustic conversion of the high-intensity sound transducer is a process involving complex multi-physical field interactions and couplings of electricity, magnetism, mechanical vibration, sound, solid structure, and fluid field. To further improve the key technical indicators of the high-intensity sound transducer, such as electro-acoustic conversion efficiency, sensitivity, maximum sound pressure level, and power capacity, based on the existing product technology, it is quite difficult. To achieve the goal, it is necessary to incorporate modern design concepts, adopt advanced technical means, break traditional thinking, and fully draw on and integrate technologies from other industries, transforming from qualitative design to quantitative and precise design. It is proposed to use multi-physical simulation methods and application design software to carry out the transducer design work, which not only improves efficiency but also obtains the accuracy of the important parameters of the key components in the transducer. During the development process of the high-intensity sound transducer, first, break through the key technologies of the high-intensity sound transducer with a single vibration system to improve the performance indicators. It is also possible to consider further integrating and designing a high-intensity sound transducer with a dual vibration system to increase the power capacity, and strive to significantly improve the key technical indicators of the electromagnetic compression driver sound transducer compared with the existing product technical indicators.

[0097] The high-intensity sound transducer proposed in the embodiment of the present invention effectively combines an electromagnetic compression driver with a horn sound outlet, taking advantage of the characteristics of the electromagnetic compression driver being easy to achieve high power and the good impedance matching of the horn sound outlet to improve the output power and output efficiency of the transducer.

[0098] The embodiments of the present invention have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A strong sound transducer, characterized in that: include: The electromagnetic compression driver comprises a magnetic circuit and a vibration component. The magnetic circuit adopts an internal magnetic structure and comprises an upper pole plate, a permanent magnet and a lower pole plate. The vibration component comprises a diaphragm, a voice coil and a voice coil frame. The diaphragm is in a ring-shaped V shape and is made of polyester polymer material. The voice coil frame is made of polyimide film material. The voice coil is wound with double-layer copper-clad aluminum wire. A pair of horn sound outlets, including a throat stopper, a throat opening, a horn and a horn opening, serving as an exit channel for sound waves; A folding ring, including an inner folding ring and an outer folding ring, is integrally formed with the diaphragm and is used to fix the diaphragm; The magnetic conductive parts include a magnetic conductive plate, a magnetic conductive yoke, a magnetic conductive sheet and a gasket.

2. The transducer according to claim 1, characterized in that The magnetic circuit is in the shape of a ring, the permanent magnet is placed between the upper pole plate and the lower pole plate, the axis of the permanent magnet coincides with the axial symmetry center of the ring, and the magnetization direction is parallel to the axial symmetry center; The upper pole plate and the lower pole plate are both made of soft magnetic material and are evenly distributed on the two poles of the permanent magnet.

3. The transducer according to claim 1, characterized in that The structure selection method of the magnetic circuit includes: Preliminary calculation and analysis were performed using finite element multi-physics field simulation analysis software. The same permanent magnet material and magnetic plate material were used to establish physical models for various magnetic circuit structures, perform simulation calculations, and obtain finite element models for each magnetic circuit structure. The magnetic field strength and sensitivity of the magnetic gap are analyzed on the finite element models of various magnetic circuit structures, and the magnetic circuit structure with more uniform magnetic gap flux density and less material of permanent magnets and magnetic conductive plates is selected.

4. The transducer according to claim 1, characterized in that The electromagnetic compression driver also includes an upper housing, a phase plug center piece, a phase plug base piece, and a lower housing; A compression cavity is formed between the diaphragm and the phase plug base, and the compression cavity is a coupling cavity for realizing compression ratio parameter regulation; The phase plug center piece and the phase plug base piece together form a phase plug channel.

5. The transducer according to claim 4, characterized in that: The shape and size of the compression chamber are determined by: Based on the multi-physics field elements of the entire transducer, an overall physical model of the transducer is established; Based on the overall physical model, accurate calculation and analysis are performed through multi-physics field finite element simulation software, and the shape and size of the compression chamber are obtained based on the optimal compression ratio parameter value; The multiphysics elements include electrical, magnetic, vibration, mechanical structure and acoustic elements.

6. The transducer according to claim 1, characterized in that The design method of the diaphragm shape includes: The finite element analysis method is used to analyze and compare the static and dynamic characteristics of the diaphragm. Through preliminary analysis, it is determined that the diaphragm is an annular V-shape; A model of the vibration component is established, static analysis and modal analysis are performed, and the annular V-shape is structurally optimized using the finite element method to obtain a diaphragm shape with high mechanical efficiency.

7. The transducer according to claim 1, characterized in that The polyimide film material is produced by Kapton; The pair of horn sound outlets is formed by closely splicing two horn sound outlets on a plane, which is used to improve the impedance matching between the overall diaphragm of the transducer and the space, thereby improving the efficiency.

8. A method for designing a transducer according to any one of claims 1 to 7, characterized in that: include: A pair of horn sound outlets are used as sound wave outlet channels of the electromagnetic compression driver to improve the overall maximum sound pressure level and output sound wave frequency range of the transducer; By using the modeling and analysis method, the structure of the magnetic circuit is selected, the shape and size of the compression chamber are determined, the diaphragm shape is designed and optimized, and then the optimal compression ratio and sensitivity are determined.

9. The method according to claim 8, characterized in that The sound wave exit channel of using a pair of horn sound outlets as an electromagnetic compression driver includes: Two horn sound outlets of a pair of horn sound outlets are closely spliced ​​on a plane to form a sound wave outlet channel of the electromagnetic compression driver; The structure of the magnetic circuit is selected as follows: Preliminary calculation and analysis were performed using finite element multi-physics field simulation analysis software. The same permanent magnet material and magnetic plate material were used to establish physical models for various magnetic circuit structures, perform simulation calculations, and obtain finite element models for each magnetic circuit structure. The magnetic field strength and sensitivity of the magnetic gap are analyzed on the finite element models of various magnetic circuit structures, and the magnetic circuit structure with more uniform magnetic gap flux density and less material of permanent magnets and magnetic conductive plates is selected.

10. The method according to claim 8, characterized in that Determining the shape and size of the compression chamber includes: Based on the multi-physics field elements of the entire transducer, an overall physical model of the transducer is established; Based on the overall physical model, accurate calculation and analysis are performed through multi-physics field finite element simulation software, and the shape and size of the compression chamber are obtained based on the optimal compression ratio parameter value; The multi-physics field elements include electric, magnetic, vibration, mechanical structure and acoustic elements; Designing and optimizing the diaphragm shape includes: The finite element analysis method is used to analyze and compare the static and dynamic characteristics of the diaphragm. Through preliminary analysis, it is determined that the diaphragm is an annular V-shape; A model of the vibration component is established, static analysis and modal analysis are performed, and the annular V-shape is structurally optimized using the finite element method to obtain a diaphragm shape with high mechanical efficiency.

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