Magnetic circuit structure for double-sided diaphragm loudspeaker and double-sided diaphragm loudspeaker

Abstract

The invention relates to the technical field of loudspeakers, and particularly discloses a magnetic circuit structure for a double-sided diaphragm loudspeaker and the double-sided diaphragm loudspeaker, and the magnetic circuit structure for the double-sided diaphragm loudspeaker comprises a first main yoke, a second main yoke and a plurality of auxiliary yokes, each of the first main yoke and the second main yoke comprises an integrally formed bottom plate part and a plurality of vertical plate parts arranged along the edge of the bottom plate part; the first main yoke and the second main yoke are symmetrically arranged, and the bottom plate parts are attached to each other; each auxiliary yoke covers, adheres and is fixed on the outer side surface of one vertical plate part of the first main yoke and the outer side surface of one vertical plate part of the second main yoke; according to the integrated coverage, seams between traditional split patches are avoided, the integrity and the structural strength of the side walls are enhanced, the problems of uneven magnetic circuit air gaps, voice coil scraping and the like are effectively prevented, and the long-term reliability and the magnetic circuit performance of the loudspeaker are improved, so that the sensitivity and the tone quality are improved.

Description

Technical Field

[0001] This application relates to the field of loudspeaker technology, and more specifically, to a magnetic circuit structure for a double-sided diaphragm loudspeaker and a double-sided diaphragm loudspeaker. Background Technology

[0002] With the pursuit of thinner and lighter designs and high-quality stereo sound in consumer electronics, dual-driver back-to-back stacked double-diaphragm loudspeakers have become a significant trend. However, in the pursuit of speaker thinning, existing technologies face core challenges: the overall thinning of the magnetic yoke results in insufficient structural strength, making it prone to plastic deformation and instability during assembly and testing. This leads to problems such as uneven air gaps in the magnetic circuit and voice coil scratching, severely impacting product yield and long-term reliability. Simultaneously, the deterioration of magnetic circuit performance results in decreased sensitivity and increased harmonic distortion, affecting sound quality. Furthermore, the significant difference in thickness between the bottom and sidewalls pushes the physical limits of the stamping process, easily causing cracks and wrinkles, thus hindering mass production.

[0003] To address these issues, related technologies have proposed a split composite magnetic circuit structure, employing a combination of thin-walled main yoke and multiple thick-walled secondary yoke patches. However, applying this structure to bi-directional loudspeakers reveals new system-level defects: component redundancy—for example, a rectangular bi-directional loudspeaker requires eight independent patches, leading to complex and costly material and supply chain management; cumbersome assembly processes requiring eight independent pick-and-place, positioning, and bonding operations, resulting in low efficiency and a high risk of accumulated errors; and the seams between patches disrupt the integrity of the sidewalls, potentially weakening structural strength, hindering heat dissipation, and affecting magnetic circuit uniformity. Therefore, existing solutions encounter bottlenecks of structural complexity and high manufacturing costs when integrated into bi-directional systems.

[0004] There is currently no effective technical solution to the above problems. Summary of the Invention

[0005] The purpose of this application is to provide a magnetic circuit structure for a dual-sided diaphragm loudspeaker and a dual-sided diaphragm loudspeaker, aiming to solve the problems of insufficient magnetic circuit structure strength, complex assembly, redundant parts and high production cost in the process of thinning existing dual-sided diaphragm loudspeakers.

[0006] In a first aspect, this application provides a magnetic circuit structure for a dual-sided diaphragm loudspeaker, comprising: a first main yoke, a second main yoke, and a plurality of secondary yokes; Both the first main yoke and the second main yoke include an integrally formed base plate portion and a plurality of vertical plate portions disposed along the edge of the base plate portion; The first and second main yokes are symmetrically arranged, and their bottom plates are in close contact with each other. Each of the secondary yokes covers and is bonded to the outer side of one vertical plate portion of the first main yoke and the outer side of one vertical plate portion of the second main yoke.

[0007] The magnetic circuit structure for a dual-sided diaphragm loudspeaker includes a first main yoke and a second main yoke with the same structure. The first main yoke has four vertical plates that are rectangularly distributed on the four sides of the base plate. The base plate has a notch at the transition between two adjacent vertical plates.

[0008] The magnetic circuit structure for a dual-sided diaphragm loudspeaker includes four secondary yokes, which respectively cover and are bonded to the outer surfaces of the four vertical plates of the first main yoke, and respectively cover and are bonded to the outer surfaces of the four vertical plates of the second main yoke.

[0009] The magnetic circuit structure for a dual-sided diaphragm loudspeaker includes a base plate with the same thickness as the vertical plate, and a secondary yoke that is plate-shaped with a thickness greater than or equal to the thickness of the vertical plate.

[0010] The magnetic circuit structure for a dual-sided diaphragm loudspeaker, wherein the secondary yoke is bonded and fixed to the vertical plate by an adhesive filled with soft magnetic powder of high permeability.

[0011] The magnetic circuit structure for a dual-sided diaphragm loudspeaker is described in which the top end of the secondary yoke is flush with the top end of the vertical plate portion of the first primary yoke to which it is bonded and fixed, and the bottom end of the secondary yoke is flush with the bottom end of the vertical plate portion of the second primary yoke to which it is bonded and fixed.

[0012] The magnetic circuit structure for a dual-sided diaphragm loudspeaker, wherein the first main yoke and the second main yoke are bonded and fixed by the mating surfaces of the base plates that fit together.

[0013] Secondly, this application also provides a dual-sided diaphragm loudspeaker, including the magnetic circuit structure for a dual-sided diaphragm loudspeaker as provided in the first aspect.

[0014] The dual-sided diaphragm loudspeaker further includes a first sound-generating component and a second sound-generating component. The first sound-generating component is mounted and fixed on the first main yoke, and the second sound-generating component is mounted on the second main yoke and is disposed opposite to the first sound-generating component.

[0015] The dual-sided diaphragm loudspeaker, wherein the first sound-generating component and the second sound-generating component have the same composition, the first sound-generating component includes a diaphragm, a voice coil, a bracket, a washer and a magnet, the diaphragm is fixed to the first main yoke by the bracket, the voice coil is fixed to the side of the diaphragm close to the first main yoke, the magnet is fixed to the first main yoke, and the washer is fixed to the magnet and located inside the voice coil.

[0016] As described above, this application provides a magnetic circuit structure for a dual-sided diaphragm loudspeaker and a dual-sided diaphragm loudspeaker. The magnetic circuit structure for the dual-sided diaphragm loudspeaker integrates each subyoke by covering two vertical plates, significantly reducing the number of parts in the magnetic circuit structure. This simplifies material management and supply chain complexity, and lowers production costs. Simultaneously, the integrated subyoke design reduces the number of independent handling, positioning, and bonding operations, greatly simplifying the assembly process, improving production efficiency, and reducing the risk of accumulated errors. Furthermore, this integrated coverage avoids the seams between traditional separate patches, enhancing the integrity and structural strength of the sidewalls, effectively preventing problems such as uneven magnetic circuit air gaps and voice coil scratching, improving the long-term reliability and magnetic circuit performance of the loudspeaker, thereby improving sensitivity and sound quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the magnetic circuit structure for a dual-sided diaphragm loudspeaker provided in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the structure of a dual-diaphragm loudspeaker provided in an embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the structure of the first sound-generating component of the split section of the double-sided diaphragm loudspeaker provided in an embodiment of this application.

[0020] Figure 4 This is a structural schematic diagram of the second part of the double-sided diaphragm loudspeaker after the first sound-emitting component, provided in an embodiment of this application.

[0021] Reference numerals: 1. First main yoke; 2. Second main yoke; 3. Secondary yoke; 4. First sound-generating assembly; 5. Second sound-generating assembly; 11. Base plate; 12. Vertical plate; 13. Notch; 41. Diaphragm; 42. Voice coil; 43. Support; 44. Washer; 45. Magnet. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not 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 the invention. 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, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0027] Firstly, please refer to Figure 1 Some embodiments of this application provide a magnetic circuit structure for a dual-sided diaphragm loudspeaker, including: a first main yoke 1, a second main yoke 2, and a plurality of secondary yokes 3; Both the first main yoke 1 and the second main yoke 2 include an integrally formed base plate portion 11 and a plurality of vertical plate portions 12 provided along the edge of the base plate portion 11. The first main yoke 1 and the second main yoke 2 are symmetrically arranged, and the bottom plate 11 fits into each other. Each secondary yoke 3 covers and is bonded to the outer side of a vertical plate portion 12 of the first main yoke 1 and the outer side of a vertical plate portion of the second main yoke 2.

[0028] Specifically, the first main yoke 1 and the second main yoke 2 are the main components of the magnetic circuit structure, each consisting of a base plate 11 and multiple vertical plates 12. The base plate 11 serves as the base of the yoke, while the vertical plates 12 extend upwards along the edge of the base plate 11, forming the sidewalls of the magnetic circuit. The first main yoke 1 and the second main yoke 2 are arranged symmetrically, and their base plates 11 are fitted together to form a compact whole. This fitting can be achieved through various means, such as mechanical clamping, bolting, or welding to tightly bond the two base plates 11. As a preferred embodiment, the base plates 11 can be fixed with adhesives, such as high-strength structural adhesives, to ensure their stability and reliability during long-term use.

[0029] More specifically, multiple auxiliary yokes 3 are configured to enhance the strength and magnetic properties of the magnetic circuit structure. Each auxiliary yoke 3 is designed to cover and bond to the outer side of one vertical plate portion 12 of the first main yoke 1 and the outer side of one vertical plate portion of the second main yoke 2. This integrated covering method is one of the key innovations of this application. For example, the auxiliary yoke 3 can be made of stamped metal sheet, the shape and size of which match the outer side of the vertical plate portion 12. During bonding, a magnetically conductive adhesive, such as epoxy resin, can be used to ensure a strong connection between the auxiliary yoke 3 and the vertical plate portion 12 and to maintain good magnetic conductivity. In this way, one auxiliary yoke 3 can simultaneously cover the vertical plate portions 12 of two main yokes, thereby significantly reducing the number of required parts and simplifying the assembly process.

[0030] In summary, the magnetic circuit structure for a dual-sided diaphragm loudspeaker of this application effectively solves the problems of insufficient structural strength, redundant parts, and complex assembly in the prior art through the symmetrical bonding of the first main yoke 1 and the second main yoke 2, and the integrated covering design of the secondary yoke 3. Compared with the traditional split composite magnetic circuit structure, the core innovation of this application lies in the fact that the secondary yoke 3 can simultaneously cover and bond to the outer surfaces of the corresponding vertical plates of the first main yoke 1 and the second main yoke 2. This integrated design significantly reduces the number of parts required for the magnetic circuit structure. For example, in some application scenarios, the number of secondary yokes 3 can be reduced from 8 to 4, thereby greatly reducing part redundancy. As a result, the complexity of material management and supply chain is reduced, and manufacturing costs are also reduced. In addition, since one secondary yoke 3 is fixed on the vertical plates 12 of the two main yokes at the same time, the assembly process is greatly simplified, eliminating the need for multiple independent pick-and-place, positioning, and bonding operations, significantly improving assembly efficiency, and reducing the risk of cumulative errors caused by multiple operations. This integrated design not only enhances the integrity and stability of the magnetic circuit structure, but also improves the uniformity of the magnetic circuit, thereby improving the magnetic circuit performance, sensitivity and sound quality of the speaker. It effectively solves the bottleneck problems of complex structure, high manufacturing cost and performance degradation in existing technologies, demonstrating significant progress and practical value.

[0031] In some preferred embodiments, the first main yoke 1 and the second main yoke 2 have the same structure. The first main yoke 1 has four vertical plate portions 12, which are rectangularly distributed on the four sides of the bottom plate portion 11. The bottom plate portion 11 has a notch 13 at the transition between two adjacent vertical plate portions 12.

[0032] Specifically, the first main yoke 1 and the second main yoke 2 have identical structures, meaning they are consistent in size, shape, material, and the number and arrangement of the vertical plates 12. This structural uniformity aims to simplify the design process, reduce production costs, and ensure the overall symmetry and balance of the magnetic circuit structure. The first main yoke 1 has four vertical plates 12, which are distributed rectangularly on the four sides of the base plate 11. This specific number and distribution aims to provide uniform magnetic field support for the magnetic circuit and a standardized interface for the subsequent installation of the secondary yoke 3. The rectangular distribution helps to form a regular magnetic circuit channel and optimize the distribution of magnetic lines of force. In practical applications, the base plate 11 has a notch 13 at the transition between pairs of adjacent vertical plates 12. The purpose of this notch 13 is to create a buffer and separation between pairs of adjacent vertical plates 12, thereby preventing interference during assembly or operation. It also helps to form specific magnetic field paths in these areas or to reserve space for the installation of other components. For example, these notches 13 can facilitate wiring for coils or other electronic components, or serve as heat dissipation channels.

[0033] More specifically, the solution of this application achieves a high degree of standardization and symmetry in structure by designing the first main yoke 1 and the second main yoke 2 to have identical structures and specifying that the number of vertical plate portions 12 is four and they are distributed in a rectangular pattern. This standardized design effectively avoids the problems of complex magnetic circuit design and uneven magnetic field distribution caused by structural uncertainties. It is precisely because of the regular distribution of the vertical plate portions 12 that the magnetic lines of force can pass through the magnetic circuit more evenly, thereby improving the working efficiency and stability of the magnetic circuit. In addition, the notch 13 provided in the bottom plate portion 11 at the transition between adjacent vertical plate portions 12 cleverly solves the possible interference problem between the vertical plate portions 12, ensuring the precise avoidance and separation of each component. This is crucial for the subsequent integrated coverage of the secondary yoke 3 and the assembly accuracy of the overall magnetic circuit structure, greatly simplifying the assembly process and reducing the potential assembly error rate.

[0034] Through the above technical solution, the magnetic circuit structure of this application, while maintaining the advantages of the basic solution, further achieves a high degree of standardization and symmetry, significantly improving the efficiency of magnetic circuit design and the uniformity of magnetic field distribution. Specifically, the first main yoke 1 and the second main yoke 2 have the same structure, simplifying the manufacturing process and reducing production costs; the four rectangularly distributed vertical plates 12 ensure the optimized path of the magnetic lines of force, enhancing the performance of the magnetic circuit; and the notch 13 set in the bottom plate 11 effectively solves the interference problem between components, greatly improving the convenience and precision of assembly, thereby improving the overall reliability and acoustic performance of the double-sided diaphragm loudspeaker.

[0035] In some preferred embodiments, there are four secondary yokes 3, which respectively cover and are bonded to the outer surfaces of the four vertical plate portions 12 of the first main yoke 1, and respectively cover and are bonded to the outer surfaces of the four vertical plate portions of the second main yoke 2.

[0036] Specifically, the number of auxiliary yokes 3 is limited to four. Given that in the aforementioned magnetic circuit structure, both the first main yoke 1 and the second main yoke 2 have four vertical plates arranged in a rectangular pattern, setting the number of auxiliary yokes 3 to four ensures that each vertical plate 12 can be covered and fixed by one auxiliary yoke 3. Specifically, each auxiliary yoke 3 is configured to simultaneously cover and adhere to the outer surface of one vertical plate 12 of the first main yoke 1 and the outer surface of one vertical plate 12 of the second main yoke 2. This one-to-one correspondence ensures that all vertical plates 12 in the magnetic circuit structure are effectively connected and the magnetic circuit is closed.

[0037] The solution of this application precisely sets the number of secondary yokes 3 to four, and then covers and bonds them one-to-one with the four vertical plate portions 12 of the first main yoke 1 and the four vertical plate portions of the second main yoke 2, thereby ensuring that the magnetic circuit structure can form a complete magnetic loop at all key locations. This configuration allows magnetic lines of force to pass evenly through each vertical plate portion 12 and secondary yoke 3, forming a balanced and efficient magnetic field distribution. At the same time, the integrated coverage and fixation of each secondary yoke 3 to two opposite vertical plate portions 12 not only simplifies the assembly process but also enhances the mechanical stability of the overall structure, effectively avoiding the problem of uneven magnetic field or structural loosening caused by the ineffective connection of some vertical plate portions 12.

[0038] In some preferred embodiments, the thickness of the base plate 11 is the same as the thickness of the vertical plate 12, and the yoke 3 is plate-shaped with a thickness greater than or equal to the thickness of the vertical plate 12.

[0039] Specifically, the base plate 11 and the vertical plate 12, as key components of the first main yoke 1 and the second main yoke 2, are designed to have the same thickness to ensure the consistency of magnetic permeability inside the magnetic circuit and to simplify the manufacturing process.

[0040] Furthermore, the secondary yoke 3 is designed as a plate-like structure, with its thickness set to be greater than or equal to the thickness of the vertical plate 12. The plate-like shape of the secondary yoke 3 means it has a relatively flat surface, facilitating its contact and bonding with the outer surface of the vertical plate 12. Its thickness being greater than or equal to the thickness of the vertical plate 12 is designed to ensure that the secondary yoke 3 provides sufficient magnetic permeability cross-sectional area to effectively carry and guide magnetic flux, avoiding magnetic saturation. Simultaneously, this thickness relationship also helps to enhance the overall mechanical strength and stability of the magnetic circuit structure, providing robust support for the speaker.

[0041] The solution in this application designs the yoke 3 as a plate with a thickness greater than or equal to the thickness of the vertical plate 12. This ensures that the yoke 3 can provide sufficient magnetic permeability, effectively drawing magnetic flux out or into the vertical plate 12 to form a complete magnetic circuit. This design not only ensures that the magnetic circuit can maintain a high magnetic field strength and uniformity during operation, but also helps to reduce the overall manufacturing cost by optimizing material utilization.

[0042] Through the above technical solutions, the magnetic circuit structure of this application can achieve superior magnetic field performance and higher structural stability. The design of the bottom plate 11 and the vertical plate 12 having the same thickness significantly improves the uniformity of magnetic flux within the magnetic circuit, effectively avoiding magnetic field distortion caused by reluctance mismatch, thereby improving the speaker's electroacoustic conversion efficiency and sound quality. Furthermore, the plate-like structure of the yoke 3 and its thickness being greater than or equal to the thickness of the vertical plate 12 not only ensures effective magnetic flux conduction but also enhances the overall rigidity and deformation resistance of the magnetic circuit structure, extending the speaker's service life. This optimized design, while ensuring high performance, also facilitates the manufacturing process and reduces production costs.

[0043] In some preferred embodiments, the yoke 3 is bonded and fixed to the vertical plate portion 12 by an adhesive filled with soft magnetic powder with high permeability.

[0044] Specifically, the adhesive filled with high-permeability soft magnetic powder refers to a conventional adhesive matrix in which fine soft magnetic powder with high magnetic permeability is uniformly mixed. These soft magnetic powders can be iron powder, ferrite powder, permalloy powder, etc., and their purpose is to improve the overall permeability of the adhesive after curing, thereby enhancing the magnetic coupling effect between the secondary yoke 3 and the vertical plate portion 12 of the main yoke. As a preferred embodiment, the adhesive can specifically be a dual-functional adhesive that is both thermally and magnetically conductive, uniformly dispersing carbonyl iron powder in an epoxy thermally conductive adhesive. The epoxy thermally conductive adhesive itself has good bonding strength and thermal conductivity, while the carbonyl iron powder, as a soft magnetic material with high permeability, with its fine particles uniformly dispersed in the epoxy thermally conductive adhesive, can not only significantly improve the magnetic permeability of the adhesive but also further assist in heat conduction. This dual-functional adhesive can simultaneously meet the requirements of the magnetic circuit structure for high permeability and efficient heat dissipation.

[0045] More specifically, the solution of this application uses an adhesive filled with high-permeability soft magnetic powder, particularly a dual-functional adhesive that is both thermally and magnetically conductive, to bond and fix the subyoke 3 and the vertical plate 12. This effectively solves the problems of insufficient magnetic coupling and low heat dissipation efficiency that may exist in traditional ordinary adhesives in magnetic circuit structures. Specifically, the introduction of high-permeability soft magnetic powder gives the adhesive layer itself the characteristics of a magnetic conductor, which can effectively reduce the magnetic resistance in the magnetic circuit, enhance the transmission efficiency of magnetic flux, and ensure that the magnetic field strength is better maintained and guided at the connection between the subyoke 3 and the vertical plate 12. At the same time, if a dual-functional adhesive that is both thermally and magnetically conductive is used, its thermal conductivity can quickly conduct away the heat generated by the magnetic circuit structure during operation, avoiding local overheating, thereby ensuring the stability and reliability of the speaker under long-term or high-power operation.

[0046] In some preferred embodiments, the top end of the secondary yoke 3 is flush with the top end of the vertical plate portion 12 of the first main yoke 1 to which it is bonded and fixed, and the bottom end of the secondary yoke 3 is flush with the bottom end of the vertical plate portion of the second main yoke 2 to which it is bonded and fixed.

[0047] Specifically, the top of the secondary yoke 3 is flush with the top of the vertical plate portion 12 of the first primary yoke 1, and the bottom of the secondary yoke 3 is flush with the bottom of the vertical plate portion of the second primary yoke 2. This means that after assembly, the upper and lower edges of the secondary yoke 3 are aligned with the upper and lower edges of the corresponding vertical plate portions 12 of the primary yoke in the height direction, thereby ensuring precise alignment of the secondary yoke 3 in the vertical direction. This design helps to form a flat magnetic circuit surface and optimize the distribution of magnetic field lines.

[0048] More specifically, in some embodiments, the yoke 3 is further provided with a mechanical positioning structure (not shown in the figure) that matches the vertical plate 12. For example, the mechanical positioning structure may include protrusions, grooves, limiting pin holes, or snap-fits, etc., and its purpose is to provide reliable lateral and longitudinal positioning for the yoke 3 before or simultaneously with bonding and fixing, preventing displacement or deflection during the bonding process. In practical applications, the mechanical positioning structure may specifically be a positioning boss provided on the yoke 3 that cooperates with a corresponding positioning groove on the vertical plate 12, or a positioning hole provided on the yoke 3 that cooperates with a positioning pin provided on the vertical plate 12.

[0049] The solution proposed in this application effectively solves the problem of insufficient assembly accuracy that may result from relying solely on adhesive bonding by setting the top of the secondary yoke 3 to be flush with the top of the vertical plate portion 12 of the first primary yoke 1, and the bottom of the secondary yoke 3 to be flush with the bottom of the vertical plate portion of the second primary yoke 2, and by providing a mechanical positioning structure on the secondary yoke 3 that matches the vertical plate portion 12. Because the mechanical positioning structure provides precise initial positioning and limiting function, the secondary yoke 3 can be accurately placed in the preset position during the bonding process, avoiding lateral and longitudinal deviations. At the same time, the flush design of the top and bottom further ensures the vertical consistency of the secondary yoke 3, thereby ensuring high-precision assembly of the entire magnetic circuit structure in three-dimensional space.

[0050] In some preferred embodiments, the first main yoke 1 and the second main yoke 2 are bonded and fixed by the mating surfaces of the bottom plate portion 11 that fit together.

[0051] Specifically, the mating surface of the base plate portion 11 refers to the contact surface formed when the base plate portion 11 of the first main yoke 1 and the base plate portion of the second main yoke 2 are mated together. By applying adhesive to this contact surface and allowing it to cure, an integral, high-strength connection can be formed.

[0052] More specifically, the solution of this application involves applying and curing an adhesive to the mating surfaces of the first main yoke 1 and the second main yoke 2 on their base plates, thereby forming a continuous and robust physical connection between the two main yokes. This connection effectively prevents relative displacement of the first main yoke 1 and the second main yoke 2 due to vibration or impact during speaker operation, thus ensuring the geometric accuracy and overall stability of the magnetic circuit structure. The filling effect of the adhesive also helps eliminate any minor gaps that may exist between the mating surfaces, further enhancing the tightness of the connection and the integrity of the magnetic circuit.

[0053] Through the above technical solution, the first main yoke 1 and the second main yoke 2 are reliably fixed together, significantly improving the overall rigidity and stability of the magnetic circuit structure and avoiding problems such as decreased magnetic circuit performance or abnormal noise caused by loose components. In addition, compared with mechanical fastening, adhesive fixing can achieve a more uniform stress distribution, reduce local stress concentration, extend the service life of the magnetic circuit structure, and may simplify the assembly process and reduce manufacturing costs.

[0054] Secondly, please refer to Figures 2-4 Some embodiments of this application also provide a dual-sided diaphragm loudspeaker, including the magnetic circuit structure for a dual-sided diaphragm loudspeaker as provided in the first aspect.

[0055] Specifically, a dual-sided diaphragm loudspeaker is a loudspeaker capable of emitting sound in two directions simultaneously (e.g., front and back directions), which is typically achieved by driving one or more diaphragms 41 to vibrate. The magnetic circuit structure described above for a dual-sided diaphragm loudspeaker can be understood as the core component that provides the magnetic field for the dual-sided diaphragm loudspeaker, and its specific structure and function have been described in detail in the above embodiments.

[0056] The solution of this application integrates the aforementioned magnetic circuit structure, which features low component redundancy and assembly complexity, into a dual-sided diaphragm loudspeaker, allowing the entire loudspeaker system to inherit the advantages of the magnetic circuit structure. Specifically, this magnetic circuit structure provides a stable and efficient magnetic field for the dual-sided diaphragm loudspeaker. This magnetic field works in conjunction with the voice coil 42 and diaphragm 41 in the loudspeaker to convert electrical signals into mechanical vibrations, thereby generating sound waves. By adopting this integrated magnetic circuit structure, the overall structure of the dual-sided diaphragm loudspeaker is simplified, thereby helping to improve production efficiency and reduce manufacturing costs, while ensuring the performance of dual-sided sound generation.

[0057] Through the above technical solution, this application provides a compact and easy-to-assemble double-sided diaphragm loudspeaker. This loudspeaker not only achieves dual-sided sound production, but also, due to its integrated internal magnetic circuit structure, effectively reduces the number of overall parts and assembly difficulty, thereby improving production efficiency, reducing manufacturing costs, and enhancing product reliability.

[0058] In some preferred embodiments, the dual-sided diaphragm loudspeaker further includes a first sound-generating component 4 and a second sound-generating component 5. The first sound-generating component 4 is mounted and fixed on the first main yoke 1, and the second sound-generating component 5 is mounted on the second main yoke 2 and is disposed opposite to the first sound-generating component 4.

[0059] Specifically, the first sound-generating component 4 and the second sound-generating component 5 are the core components of the loudspeaker responsible for converting electrical signals into mechanical vibrations, thereby generating sound waves. The first sound-generating component 4 is designed to be mounted and fixed on the first main yoke 1, while the second sound-generating component 5 is mounted on the second main yoke 2. This mounting method allows the two sound-generating components to fully utilize the magnetic field provided by the magnetic circuit structure. The first sound-generating component 4 and the second sound-generating component 5 are configured to face away from each other, meaning their sound-generating directions are opposite, thus achieving a double-sided sound-generating effect.

[0060] When an electrical signal is input, these sound-generating components vibrate under the influence of the magnetic field generated by the magnetic circuit structure, thereby driving the diaphragm 41 to produce sound. Since the first sound-generating component 4 and the second sound-generating component 5 are positioned opposite each other, they can radiate sound waves in opposite directions, thus achieving the unique sound production mode of the dual-sided diaphragm loudspeaker. This configuration allows the loudspeaker to emit sound simultaneously from two opposing surfaces, greatly enhancing the sound coverage and auditory experience.

[0061] In some preferred embodiments, the first sound-generating component 4 and the second sound-generating component 5 have the same composition. The first sound-generating component 4 includes a diaphragm 41, a voice coil 42, a support 43, a washer 44, and a magnet 45. The diaphragm 41 is fixed to the first main yoke 1 by the support 43. The voice coil 42 is fixed to the side of the diaphragm 41 close to the first main yoke 1. The magnet 45 is fixed to the first main yoke 1. The washer 44 is fixed to the magnet 45 and located inside the voice coil 42.

[0062] Specifically, the first sound-generating component 4 and the second sound-generating component 5 have identical compositions, designed to ensure that the dual-diaphragm loudspeaker has the same acoustic characteristics and output effect in both directions. The diaphragm 41 is the core component of the loudspeaker that converts electrical signals into sound waves; it generates sound by vibrating and pushing air. The voice coil 42 is the electromagnetic component that drives the movement of the diaphragm 41; when current passes through the voice coil 42, it experiences a force in the magnetic field and undergoes displacement. The bracket 43 supports and fixes the diaphragm 41 and mounts it on the first main yoke 1, ensuring that the diaphragm 41 can reciprocate stably. The washer 44 and the magnet 45 together constitute the loudspeaker's magnetic circuit system. The magnet 45 generates a constant magnetic field, while the washer 44 guides and concentrates the magnetic lines of force, forming a uniform magnetic gap around the voice coil 42. The voice coil 42 is precisely placed within this magnetic gap so that it can effectively interact with the magnetic field when energized.

[0063] This application's solution, by clearly defining the specific composition and installation relationship of the first sound-generating component 4 and the second sound-generating component 5, enables a double-sided diaphragm loudspeaker to achieve efficient and symmetrical acoustic output. Specifically, magnet 45 is fixed to the first main yoke 1, forming a magnetic field loop together with washer 44, and providing a stable magnetic gap for voice coil 42 inside washer 44. Voice coil 42 is fixed to diaphragm 41. When voice coil 42 is energized, it vibrates under the action of Lorentz force in the magnetic field, thereby driving diaphragm 41 to vibrate. The vibration of diaphragm 41 pushes and pulls air, thereby generating sound waves. Since the first sound-generating component 4 and the second sound-generating component 5 have the same composition and are arranged back-to-back, it ensures that the loudspeaker can generate sound waves with the same characteristics and intensity in both directions, avoiding acoustic performance mismatch problems caused by structural differences.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0065] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A magnetic circuit structure for a dual-sided diaphragm loudspeaker, characterized in that, include: The first main yoke, the second main yoke, and multiple secondary yokes; Both the first main yoke and the second main yoke include an integrally formed base plate portion and a plurality of vertical plate portions disposed along the edge of the base plate portion; The first and second main yokes are symmetrically arranged, and their bottom plates are in close contact with each other. Each of the secondary yokes covers and is bonded to the outer side of one vertical plate portion of the first main yoke and the outer side of one vertical plate portion of the second main yoke.

2. The magnetic circuit structure for a dual-sided diaphragm loudspeaker according to claim 1, characterized in that, The first main yoke and the second main yoke have the same structure. The first main yoke has four vertical plates, which are rectangularly distributed on the four sides of the bottom plate. The bottom plate has a notch at the transition between two adjacent vertical plates.

3. The magnetic circuit structure for a dual-sided diaphragm loudspeaker according to claim 2, characterized in that, The secondary yoke consists of four parts, which respectively cover and are bonded to the outer surfaces of the four vertical plates of the first main yoke, and respectively cover and are bonded to the outer surfaces of the four vertical plates of the second main yoke.

4. The magnetic circuit structure for a dual-sided diaphragm loudspeaker according to claim 1, characterized in that, The thickness of the base plate is the same as the thickness of the vertical plate, and the secondary yoke is plate-shaped with a thickness greater than or equal to the thickness of the vertical plate.

5. The magnetic circuit structure for a dual-sided diaphragm loudspeaker according to claim 1, characterized in that, The secondary yoke is bonded and fixed to the vertical plate by an adhesive filled with soft magnetic powder with high permeability.

6. The magnetic circuit structure for a dual-sided diaphragm loudspeaker according to claim 1, characterized in that, The top end of the secondary yoke is flush with the top end of the vertical plate of the first main yoke to which it is bonded and fixed, and the bottom end of the secondary yoke is flush with the bottom end of the vertical plate of the second main yoke to which it is bonded and fixed.

7. The magnetic circuit structure for a double-sided diaphragm loudspeaker according to claim 1, characterized in that, The first main yoke and the second main yoke are bonded and fixed together by the mating surfaces of the base plates that fit together.

8. A double-sided diaphragm loudspeaker, characterized in that, Includes the magnetic circuit structure for a dual-sided diaphragm loudspeaker as described in any one of claims 1-7.

9. The dual-sided diaphragm loudspeaker according to claim 8, characterized in that, The dual-sided diaphragm loudspeaker further includes a first sound-generating component and a second sound-generating component. The first sound-generating component is mounted and fixed on the first main yoke, and the second sound-generating component is mounted on the second main yoke and is positioned opposite to the first sound-generating component.

10. The dual-sided diaphragm loudspeaker according to claim 9, characterized in that, The first sound-generating component has the same composition as the second sound-generating component. The first sound-generating component includes a diaphragm, a voice coil, a bracket, a washer, and a magnet. The diaphragm is fixed to the first main yoke by the bracket. The voice coil is fixed to the side of the diaphragm close to the first main yoke. The magnet is fixed to the first main yoke. The washer is fixed to the magnet and located inside the voice coil.

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