Composite yoke structure of loudspeaker, manufacturing method and loudspeaker

Abstract

The invention relates to the technical field of loudspeakers, and particularly discloses a composite yoke structure of a loudspeaker, a manufacturing method and the loudspeaker, the composite yoke structure comprises a main yoke and an auxiliary yoke, the main yoke comprises a bottom plate part and a vertical plate part, the bottom plate part and the vertical plate part are integrally formed, and the vertical plate part is arranged along the edge of the bottom plate part and is bent upwards; the thickness of the bottom plate part is the same as that of the vertical plate part, and the auxiliary yoke covers, adheres and is fixed on the outer side surface of the vertical plate part; according to the structural design, the physical limit of an existing stamping process when the thickness difference between the bottom and the side wall is greatly different is avoided, and breakage or wrinkles caused by uneven material flowing are avoided, so that the production yield is increased, and the possibility is provided for economic and stable large-scale production.

Description

Technical Field

[0001] This application relates to the field of loudspeaker technology, and more specifically, to a composite yoke structure for a loudspeaker, a manufacturing method thereof, and the loudspeaker itself. Background Technology

[0002] In the wave of thinner and lighter consumer electronics, speaker design is constantly striving for extreme thinness and high integration to meet the market demands of portable devices such as smartphones and wearables. This trend has driven continuous innovation in key components of magnetic circuit systems. The industry is committed to optimizing the magnetic yoke structure to balance audio performance, structural reliability, and mass production feasibility, while meeting the constraints of overall thickness and the need for improved user experience. Related technological explorations focus on material selection and process optimization, reflecting the electronics manufacturing sector's proactive pursuit of efficient and compact solutions.

[0003] However, existing technologies, in pursuing speaker thinning, face the challenge of insufficient strength in the magnetic yoke structure. The overall thinning strategy makes the magnetic yoke susceptible to plastic deformation and instability during assembly and testing, leading to 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 manifests as increased magnetic reluctance and decreased magnetic flux density, directly affecting speaker sensitivity and harmonic distortion, failing to meet the demands of high-quality audio playback. Furthermore, existing stamping processes have physical limitations in achieving significant thickness differences between the bottom and sidewalls; uneven material flow can easily cause cracks or wrinkles, significantly reducing production yield and hindering economical and stable large-scale production. These problems collectively restrict the reliable application of speakers in thin and lightweight devices, urgently requiring a solution that can improve the strength of the speaker yoke structure, optimize magnetic circuit performance, and increase production yield.

[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 composite yoke structure, manufacturing method and loudspeaker, which aims to solve the problems of insufficient strength of the magnetic yoke structure, deterioration of magnetic circuit performance and physical limitations of the stamping process in achieving the design of a large thickness difference between the bottom and the side wall when pursuing thinner loudspeakers, resulting in low production yield.

[0006] In a first aspect, this application provides a composite yoke structure for a loudspeaker, the composite yoke structure including a main yoke and a secondary yoke, the main yoke including an integrally formed base plate portion and a vertical plate portion formed by bending upward along the edge of the base plate portion, the thickness of the base plate portion and the thickness of the vertical plate portion being the same, and the secondary yoke covering and adhesively fixing to the outer surface of the vertical plate portion.

[0007] The speaker has a composite yoke structure, wherein the secondary yoke is plate-shaped and its thickness is greater than or equal to the thickness of the vertical plate portion.

[0008] The speaker has a composite yoke structure, wherein there are four vertical plates, which are rectangularly distributed on the four sides of the base plate, and the base plate has a notch at the transition between two adjacent vertical plates.

[0009] Secondly, this application also provides a method for manufacturing a composite yoke structure for a loudspeaker, the method comprising the following steps: S1. Prepare a main yoke and a secondary yoke. The main yoke includes an integrally formed base plate and a vertical plate formed by bending upward along the edge of the base plate. The thickness of the base plate and the thickness of the vertical plate are the same. S2. Perform surface cleaning treatment on the outer side of the vertical plate; S3. Use adhesive to cover and bond the subyoke iron to the outer side of the vertical plate, and perform alignment and pressing treatment. S4. Cure the adhesive to obtain the composite yoke structure of the loudspeaker.

[0010] The method for manufacturing the composite yoke structure of the loudspeaker further includes a step performed between steps S2 and S3: S21. Perform micro-etching treatment on the outer surface of the vertical plate.

[0011] The method for manufacturing the composite yoke structure of the loudspeaker, wherein the adhesive is a thermally and magnetically conductive dual-function adhesive filled with high-permeability soft magnetic powder.

[0012] The method for manufacturing the composite yoke structure of the loudspeaker, wherein the alignment and pressing process in step S3 includes: The subyoke and the vertical plate are aligned using the pre-set alignment features and / or alignment platforms on the subyoke and the vertical plate, and the subyoke and the vertical plate are pressed together based on a pre-set pressing force.

[0013] The method for manufacturing the composite yoke structure of the loudspeaker, wherein step S4 includes: S41. While maintaining the pressing force of the alignment pressing process, the adhesive is pre-cured on the assembly of the subyoke and the vertical plate based on a first preset temperature. S42. While maintaining the pressing force of the alignment pressing process, the assembly is subjected to primary curing of the adhesive based on a second preset temperature, wherein the second preset temperature is higher than the first preset temperature. S43. Cool the assembly while maintaining the pressing force of the alignment pressing process or under a holding pressure lower than the pressing force.

[0014] The method for manufacturing the composite yoke structure of the loudspeaker, wherein the first preset temperature is 60-80℃ and the second preset temperature is 110-130℃.

[0015] Thirdly, this application also provides a loudspeaker, including the composite yoke structure of the loudspeaker as provided in the first aspect, or including the composite yoke structure of the loudspeaker manufactured based on the manufacturing method of the composite yoke structure of the loudspeaker as provided in the second aspect.

[0016] As described above, this application provides a composite yoke structure for a loudspeaker, a manufacturing method, and the loudspeaker itself. The composite yoke structure of the loudspeaker, by integrally molding the base plate and vertical plate of the main yoke with the same thickness, and then covering and bonding the secondary yoke to the outer surface of the vertical plate, effectively solves the problem of insufficient strength of the magnetic yoke structure in existing technologies when making loudspeakers thinner. This structural design avoids the plastic deformation and instability risks caused by traditional overall thinning strategies, thus ensuring the uniformity of the air gap in the magnetic circuit, effectively preventing voice coil scratching, and significantly improving product yield and long-term reliability. Simultaneously, the composite structure optimizes magnetic circuit performance, reduces magnetic reluctance, and increases magnetic flux density, thereby improving loudspeaker sensitivity and reducing harmonic distortion, meeting the requirements for high-quality audio playback. Furthermore, this structural design avoids the physical limits of existing stamping processes when achieving a significant thickness difference between the bottom and sidewalls, preventing cracks or wrinkles caused by uneven material flow, thus improving production yield and providing the possibility for economical and stable large-scale production. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the composite yoke structure of the loudspeaker provided in an embodiment of this application.

[0018] Figure 2 A flowchart illustrating the method for manufacturing the composite yoke structure of the loudspeaker provided in this application embodiment.

[0019] Figure 3 This is a schematic diagram of the structure of a loudspeaker provided in an embodiment of this application.

[0020] Reference numerals: 1. Main yoke; 2. Secondary yoke; 11. Base plate; 12. Vertical plate; 13. Notch. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Firstly, please refer to Figure 1 Some embodiments of this application provide a composite yoke structure for a loudspeaker. The composite yoke structure includes a main yoke 1 and a secondary yoke 2. The main yoke 1 includes an integrally formed base plate portion 11 and a vertical plate portion 12 formed by bending upward along the edge of the base plate portion 11. The thickness of the base plate portion 11 and the thickness of the vertical plate portion 12 are the same. The secondary yoke 2 covers and is bonded to the outer surface of the vertical plate portion 12.

[0024] Specifically, the yoke is an important component of the loudspeaker's magnetic circuit system. Its main function is to provide a magnetic flux loop, guiding magnetic lines of force through the voice coil, thereby converting electrical energy into acoustic energy. In this application, the main yoke 1 refers to the main load-bearing part of the loudspeaker's composite yoke structure, which is formed by an integral molding process and includes a base plate 11 and a vertical plate 12. The secondary yoke 2 refers to an auxiliary structure attached to the outside of the vertical plate 12 of the main yoke 1, which is bonded to the main yoke 1 to jointly form the composite yoke structure.

[0025] Specifically, the main yoke 1 can be fabricated in various ways. For example, it can be formed by precision stamping of a metal sheet in one step, creating a structure with a base plate 11 and a vertical plate 12. The base plate 11 can be circular, square, or any polygon, and its thickness can be set according to the overall design requirements of the speaker. The vertical plate 12 is formed by bending upwards along the edge of the base plate 11, and its thickness is the same as that of the base plate 11. This one-piece design ensures the structural integrity and initial strength of the main yoke 1. As another implementation, the main yoke 1 can also be fabricated using laser cutting and bending processes. First, the metal sheet is cut into an unfolded planar shape, and then the sides are bent upwards using a high-precision bending device to form the vertical plate 12. The shape and size of the secondary yoke 2 can be designed according to the outer surface shape of the vertical plate 12 to ensure complete coverage and bonding to the outer surface of the vertical plate 12. For example, if the vertical plate 12 is rectangular, the secondary yoke 2 can also be fabricated as a rectangular plate. The thickness of the secondary yoke 2 can be selected according to the required structural strength and magnetic circuit performance. The bonding and fixing of the subyoke 2 and the vertical plate 12 can be achieved by various adhesives, such as epoxy resin, acrylic resin, or polyurethane adhesive. The bonding process may include steps such as applying adhesive, alignment, pressing, and curing to ensure a strong mechanical connection and good magnetic connection between the subyoke 2 and the vertical plate 12.

[0026] The composite yoke structure of this application effectively solves the problems of insufficient structural strength, deteriorated magnetic circuit performance, and low production yield faced by existing technologies in achieving speaker thinning through the synergistic effect of the main yoke 1 and the secondary yoke 2. Specifically, the integrally formed base plate 11 and vertical plate 12 of the main yoke 1 provide basic structural support and magnetic flux circuit. However, in the pursuit of extreme thinness, the main yoke 1, formed by stamping from a single thin sheet, is prone to plastic deformation during assembly and testing, leading to uneven air gap in the magnetic circuit and causing problems such as voice coil scratching. To overcome this challenge, this application introduces the secondary yoke 2. The secondary yoke 2 covers and is bonded to the outer surface of the vertical plate 12 of the main yoke 1, forming a composite structure. This composite structure significantly enhances the overall rigidity and deformation resistance of the vertical plate 12. When the speaker is working or subjected to external stress, the secondary yoke 2 and the vertical plate 12 share the load, effectively dispersing the stress and thus greatly reducing the risk of buckling or plastic deformation of the vertical plate 12. As a result, the uniformity of the air gap in the magnetic circuit is maintained, and the voice coil scraping problem is effectively suppressed, thereby improving the product yield and long-term reliability of the loudspeaker. Furthermore, the addition of the sub-yoke 2 also optimizes the magnetic circuit performance. Since the sub-yoke 2 typically uses a high-permeability material, its composite structure with the vertical plate 12 increases the effective cross-sectional area of ​​the magnetic flux, reduces magnetic reluctance, and thus increases the magnetic flux density. The increased magnetic flux density directly enhances the loudspeaker's sensitivity and reduces harmonic distortion, enabling the loudspeaker to provide higher-quality audio playback. Simultaneously, this composite structure design avoids the physical limitations that traditional stamping processes may encounter when achieving significant thickness differences between the bottom and sidewalls, preventing cracking or wrinkling problems caused by uneven material flow, thereby improving production yield and creating conditions for economical and stable large-scale production.

[0027] Compared with existing technologies, the core innovation of this application lies in the introduction of a composite structure where the secondary yoke 2 and the vertical plate portion 12 of the main yoke 1 are combined to form a novel composite yoke structure. Traditional thin loudspeaker yoke structures are typically made from a single material in a single molding process, often sacrificing structural strength and magnetic circuit performance in the pursuit of thinness. For example, in existing technologies, to reduce loudspeaker thickness, the yoke wall thickness is designed to be very thin, but this makes the yoke prone to deformation under external impact or internal stress, thus affecting the uniformity of the magnetic circuit air gap and even causing voice coil scratching. This application effectively increases the overall thickness and rigidity of the vertical plate portion 12 by bonding and fixing the secondary yoke 2 to the outer surface of the vertical plate portion 12 of the main yoke 1, thereby significantly improving the deformation resistance of the yoke structure. This composite structure not only solves the problem of insufficient strength in traditional thin yokes but also improves the magnetic flux density by optimizing the magnetic flux path, thus improving the speaker's sensitivity and sound quality. Furthermore, the design of this application avoids the technological challenges faced by traditional stamping processes when manufacturing yokes with complex thickness variations, improving production yield. Therefore, the composite yoke structure of this application significantly improves the structural reliability, magnetic circuit performance and production efficiency of the loudspeaker while ensuring its thinness, and has significant progressive and practical value.

[0028] In some preferred embodiments, the secondary yoke 2 is plate-shaped and its thickness is greater than or equal to the thickness of the vertical plate portion 12.

[0029] Specifically, the secondary yoke 2 is designed as a plate-like structure to fit tightly against the outer surface of the vertical plate 12, forming a flat and efficient magnetic circuit channel. The thickness of the secondary yoke 2 is set to be greater than or equal to the thickness of the vertical plate 12. As a preferred embodiment, the thickness of the secondary yoke 2 can preferably be 1.4-2 times the thickness of the vertical plate 12. This helps reduce magnetic reluctance in the magnetic circuit, reduces magnetic saturation, and ensures that magnetic lines of force can pass through the magnetic gap more effectively, enhancing the driving force of the speaker. Furthermore, a thicker secondary yoke 2 also provides higher mechanical strength and rigidity to the entire composite yoke structure, effectively suppressing vibrations and deformations that may occur during speaker operation, thereby improving the stability and reliability of sound quality. For example, when the thickness of the vertical plate 12 is 0.3 mm, the thickness of the secondary yoke 2 can preferably be 0.5 mm. These thickness parameters are set to meet the specific performance requirements of the composite thin speaker, including but not limited to magnetic circuit efficiency, structural strength, and overall thickness control.

[0030] Through the above technical solution, the composite yoke structure of this application can significantly improve the magnetic circuit efficiency and structural stability of the thin speaker. Specifically, by precisely controlling the thickness ratio of the secondary yoke 2 to the vertical plate 12, the magnetic flux distribution can be effectively optimized, magnetic leakage reduced, and thus the electroacoustic conversion efficiency and sound pressure output of the speaker improved. At the same time, the enhanced structural strength helps to reduce resonance and distortion, enabling the thin speaker to provide clearer and more powerful sound quality while maintaining its compact size, thereby better meeting the needs of modern electronic products for high-performance thin speakers.

[0031] In some preferred embodiments, there are four vertical plate portions 12, which are rectangularly distributed on the four sides of the base plate portion 11, and the base plate portion 11 is provided with a notch 13 at the transition between two adjacent vertical plate portions 12.

[0032] Specifically, four vertical plates 12 are provided and distributed in a rectangular manner on the four sides of the base plate 11. This configuration is typically used to construct rectangular or square speaker magnetic circuits, effectively utilizing space and providing a balanced magnetic field distribution. The notch 13 is designed to address the material interference problem that may occur in the corner areas of adjacent vertical plates 12 when the base plate 11 is bent to form multiple vertical plates 12 during the integral molding of the main yoke 1. By providing the notch 13, it is ensured that adjacent vertical plates 12 can avoid each other during molding, thereby preventing material stacking, stress concentration, or deformation, and ensuring the structural accuracy and geometric precision after bending.

[0033] More specifically, the number of secondary yokes 2 is also set to four, and they are respectively covered and bonded to the outer surfaces of the four vertical plate portions 12. In order to ensure the best bonding effect and structural integrity, the plate shape of each secondary yoke 2 is designed to be precisely consistent with the outer plate shape of the corresponding bonded vertical plate portion 12, thereby achieving a tight fit and uniform force distribution.

[0034] More specifically, the solution of this application effectively solves the interference and stress problems that may occur when bending polygonal structures with traditional one-piece molded yokes by clearly defining the vertical plate portions 12 as four in a rectangular distribution and supplementing them with the design of notches 13 on the base plate portion 11. The presence of notches 13 allows each vertical plate portion 12 to be bent into place independently and precisely during the molding process, avoiding material accumulation and deformation at the corners, thereby ensuring the geometric accuracy and structural stability of the main yoke 1. At the same time, the four matching secondary yokes 2 are precisely bonded to the outside of the corresponding vertical plate portions 12, which not only provides additional mechanical support and enhances the overall rigidity of the composite yoke, but also optimizes the magnetic conductivity of the magnetic circuit, ensuring the uniformity and efficiency of the magnetic field distribution.

[0035] Secondly, please refer to Figure 2Some embodiments of this application also provide a method for manufacturing a composite yoke structure for a loudspeaker, the method comprising the following steps: S1. Prepare the main yoke 1 and the secondary yoke 2. The main yoke 1 includes an integrally formed base plate 11 and a vertical plate 12 formed by bending upward along the edge of the base plate 11. The thickness of the base plate 11 and the thickness of the vertical plate 12 are the same. S2. Perform surface cleaning treatment on the outer side of the vertical plate 12 to remove organic contaminants and oxides, and improve the surface energy of the metal to create optimal conditions for subsequent adhesive wetting and adhesion. S3. Use adhesive to cover and bond the subyoke 2 to the outer side of the vertical plate 12, and perform alignment and pressing. S4. Curing adhesive to obtain the composite yoke structure of the loudspeaker.

[0036] Specifically, the above method, through refined surface treatment and precise bonding and curing processes, ensures that a high-strength and high-reliability composite structure is formed between the main yoke 1 and the secondary yoke 2, thereby significantly improving the overall performance and manufacturing efficiency of the speaker yoke.

[0037] Specifically, in step S1, the main yoke 1 and the secondary yoke 2 are prepared by stamping. The main yoke 1 can be prepared using a single or multiple precision stamping process to ensure that the base plate 11 and the vertical plate 12 are integrally formed and have a consistent thickness. The secondary yoke 2 can be prepared from a sheet metal by shearing, stamping, or laser cutting, and its shape and size should match the outer surface of the vertical plate 12. In step S2, the surface cleaning treatment aims to remove any organic contaminants, oxides, and other impurities, thereby enhancing the energy of the metal surface and creating optimal conditions for the subsequent good wetting and adhesion of the adhesive. Specific cleaning methods may include, but are not limited to: wiping or soaking with organic solvents (e.g., alcohol, acetone); or removing surface contaminants by ultrasonic cleaning combined with alkaline or acidic cleaning agents. In step S3, the adhesive can be selected according to the specific performance requirements of the speaker and the production process conditions. The adhesive can be applied by manual coating, scraping, spraying, or dotting. The alignment and pressing process aims to ensure precise alignment of the sub-yoke 2 with the vertical plate 12 and to spread the adhesive layer evenly, while eliminating any air bubbles to form a tight and defect-free bonding interface. For example, this can be achieved by visually aligning the parts manually and then applying uniform pressure, or by using simple mechanical clamps for fixation. In step S4, the curing process should be carried out according to the characteristics of the selected adhesive to ensure that the adhesive reacts fully and achieves the expected mechanical strength and stability. For example, for thermosetting adhesives, the assembly can be placed in an oven and cured at a preset constant temperature for a certain period of time; for room temperature curing adhesives, simply placing it at room temperature for a sufficient time is sufficient.

[0038] The method of this application effectively enhances the surface energy of the metal through surface cleaning in step S2, laying the foundation for good wetting and adhesion of the adhesive. The alignment and pressing process in step S3 ensures the uniformity and bubble-free nature of the adhesive layer, thereby maximizing bond strength and the continuity of the magnetic circuit connection. The curing process in step S4 allows the adhesive performance to be fully utilized, ultimately forming a high-strength, high-reliability composite yoke structure. Therefore, the method of this application not only solves the problems of easy deformation and uneven magnetic circuit air gaps in traditional thin yokes during assembly and testing, but also improves the sensitivity and sound quality of the loudspeaker by optimizing the bonding interface, reducing magnetic reluctance, and increasing magnetic flux density. Furthermore, the standardized process effectively reduces uncertainties in the production process, significantly improving product yield and providing a solid manufacturing foundation for the large-scale application of loudspeakers in thin and light devices.

[0039] In some preferred embodiments, the method further includes steps performed between steps S2 and S3: S21. Perform micro-etching treatment on the outer surface of the vertical plate 12.

[0040] Specifically, micro-etching refers to modifying the microstructure of the outer surface of the vertical plate 12 through chemical or physical methods, thereby forming an irregular uneven structure on its surface. This surface morphology with micro-roughness can be understood as the presence of a large number of tiny peaks and valleys on a macroscopically smooth surface.

[0041] More specifically, the micro-etching process in this step is used to form a surface morphology with micro-roughness on the outer surface of the vertical plate portion 12, so that the subsequent adhesive and the vertical plate portion 12 will have a physical anchoring effect, thereby enhancing the mechanical bonding strength between the subsequent subyoke 2 and the vertical plate portion 12. The physical anchoring effect refers to the fact that during the curing process, the adhesive can fully wet and fill these micro-uneven structures, forming a mechanical interlock, like a "rivet" to firmly bond the adhesive to the vertical plate portion 12.

[0042] More specifically, the arithmetic mean roughness Ra value of the surface morphology of this micro-roughness is in the range of 0.5 μm to 5 μm, preferably 2 μm. An arithmetic mean roughness Ra value in the range of 0.5 μm to 5 μm effectively provides sufficient anchoring points while avoiding excessive etching that could adversely affect material properties. The Ra value is set to 2 μm to achieve the optimal balance between anchoring effect and material integrity.

[0043] This application's solution involves introducing micro-etching after surface cleaning and before bonding, creating a microstructure with a specific roughness on the outer surface of the vertical plate 12. This micro-roughness allows the subsequently applied adhesive to penetrate deep into these tiny depressions and pores during curing, forming a tight, physically interlocked structure. This physical anchoring effect, synergistic with traditional chemical bonding, significantly increases the effective contact area and shear resistance of the bonding interface. When external stress is applied to the composite yoke structure, the mechanical interlock between the adhesive and the vertical plate 12 effectively disperses and transfers stress, thereby significantly improving the overall mechanical bond strength between the sub-yoke 2 and the vertical plate 12, effectively preventing bonding failure under extreme conditions.

[0044] In some preferred embodiments, the adhesive is a thermally and magnetically conductive dual-function adhesive filled with soft magnetic powder of high magnetic permeability.

[0045] Specifically, the thermally and magnetically conductive dual-function adhesive filled with high-permeability soft magnetic powder refers to an adhesive matrix (such as epoxy thermally conductive adhesive) uniformly dispersed with soft magnetic powder (such as carbonyl iron powder) possessing high magnetic permeability. High thermal conductivity (vertical thermal conductivity ≥ 1.8 W / (m·K)) ensures efficient heat transfer from the heat-generating component to the yoke iron structure, thereby achieving effective heat dissipation. Magnetic permeability ensures the continuity of the magnetic circuit and low magnetic resistance at the bonding interface. In practical applications, precision coating equipment, such as micro-dispensing machines or screen printing equipment, can be used to precisely control the amount and uniformity of adhesive application. Through these devices, the adhesive can be applied quantitatively and uniformly to the outer surface of the vertical plate 12, forming an adhesive layer with a thickness precisely controlled within the range of 20-50 μm. This precise control of the adhesive layer thickness is crucial for ensuring the stability and consistency of the thermal and magnetic conductivity properties of the bonding interface.

[0046] More specifically, the solution of this application employs a dual-functional adhesive that is both thermally and magnetically conductive, filled with high-permeability soft magnetic powder. This allows the adhesive layer between the main yoke 1 and the secondary yoke 2 to not only provide a mechanical connection but also become an important component of the magnetic circuit and heat conduction path. The presence of the high-permeability soft magnetic powder effectively reduces the magnetic resistance at the adhesive interface, allowing magnetic lines of force to pass through more smoothly, thereby improving the overall efficiency of the speaker's magnetic circuit. Simultaneously, the high thermal conductivity of the adhesive ensures that the heat generated during speaker operation is rapidly and effectively conducted to the yoke structure for dissipation, preventing performance degradation and component damage caused by heat accumulation. Furthermore, applying the adhesive quantitatively and uniformly using precision coating equipment allows for precise control of the adhesive layer thickness, avoiding problems such as uneven adhesive layer and bubbles that may occur with traditional coating methods, further ensuring the stability and reliability of the thermal and magnetic conductivity of the adhesive interface.

[0047] Through the above technical solution, the composite yoke structure of the loudspeaker significantly improves magnetic circuit efficiency and thermal management capabilities while maintaining good mechanical connection. This helps to enhance the magnetic field strength of the loudspeaker, improve electroacoustic conversion efficiency, and thus improve sound quality. At the same time, effective heat dissipation can extend the operating life of the loudspeaker and improve its reliability and stability under long-term high-power operation, which is especially suitable for thin loudspeaker products with high performance and reliability requirements.

[0048] In some preferred embodiments, the alignment pressing process in step S3 includes: Align the yoke 2 and the vertical plate 12 using the pre-set alignment features and / or alignment platforms on the yoke 2 and the vertical plate 12, and press the yoke 2 and the vertical plate 12 together based on the pre-set pressing force.

[0049] Specifically, the pre-designed alignment features can be understood as geometric structures pre-designed or machined on the yoke 2 and the vertical plate 12, such as positioning holes, positioning pins, grooves, or protrusions. Their purpose is to provide a precise physical reference during assembly to ensure accurate alignment of the yoke 2 and the vertical plate 12. The alignment platform refers to tooling fixtures or equipment used to assist alignment, such as a base with positioning pins or a robotic arm assisted by a vision recognition system. It provides stable support and precise guidance, further improving alignment accuracy.

[0050] More specifically, the preset pressing force refers to the pre-set and calibrated force applied to the subyoke 2 and the vertical plate 12 during the pressing process. The magnitude of this pressing force needs to be comprehensively considered based on factors such as the rheological properties of the adhesive used, the bonding area, and the mechanical strength of the material. Its purpose is to ensure that the adhesive can fully wet the bonding surface and spread evenly without damaging the parts, while effectively expelling air or solvent vapors between the interfaces to avoid the formation of bubbles.

[0051] The solution proposed in this application effectively solves the alignment deviation problem that may occur in the traditional pressing process by introducing preset alignment features and / or alignment platforms, ensuring the precise geometric relationship between the subyoke 2 and the vertical plate 12. It is precisely because of this precise alignment that the subsequent pressing process can act on the correct bonding area. Simultaneously, pressing based on a preset pressing force applies uniform and appropriate pressure to the adhesive, promoting sufficient flow and spread of the adhesive at the bonding interface, thereby forming a continuous and void-free adhesive layer. Furthermore, under the action of the pressing force, air between the bonding interfaces can be effectively squeezed out, avoiding the formation of air bubbles. These air bubbles, after curing, will form stress concentration points, severely weakening the bond strength.

[0052] In some preferred embodiments, step S4 includes: S41. While maintaining the pressing force of the alignment pressing process, the adhesive is pre-cured on the assembly of the subyoke 2 and the vertical plate 12 based on the first preset temperature. S42. While maintaining the pressing force of the alignment pressing process, the adhesive is mainly cured on the assembly based on the second preset temperature, which is higher than the first preset temperature. S43. Cool the assembly while maintaining the pressing force of the alignment pressing process or under a holding pressure lower than the pressing force.

[0053] Specifically, step S41 involves allowing the adhesive to undergo a preliminary cross-linking reaction at a relatively low temperature, forming a certain initial strength to fix the positions of the sub-yoke 2 and the vertical plate 12, preventing displacement or deformation during the subsequent main curing process. Maintaining the pressure is to ensure uniform spread of the adhesive layer and continuously eliminate any possible micro-air bubbles, maintaining good contact. Step S42 involves allowing the adhesive to undergo a full chemical cross-linking reaction at a temperature higher than the first preset temperature, achieving its final mechanical strength, thermal conductivity, magnetic conductivity, and weather resistance. The second preset temperature is higher than the first preset temperature, aiming to provide sufficient energy to drive the complete curing of the adhesive, ensuring optimal bonding performance. Continuously applying pressure at this stage helps maintain tight contact at the bonding interface, further improving the curing quality. Step S43 aims to gradually cool the cured composite yoke structure to room temperature or near room temperature to avoid thermal stress caused by rapid cooling, thereby reducing stress concentration within the structure and preventing warping or cracking. Maintaining a certain pressure or reducing the pressure during cooling helps to further stabilize the structure before the adhesive is fully hardened and allows the material to be micro-adjusted during cooling, further optimizing the stress distribution at the bonding interface.

[0054] This application's solution effectively solves problems such as uneven curing, stress concentration, and insufficient bond strength that may occur with traditional single-curing methods by dividing the adhesive curing process into three stages: pre-curing, main curing, and cooling, and applying precisely controlled pressure throughout the process. Specifically, step S41 provides initial cross-linking for the adhesive at a lower temperature, allowing the sub-yoke 2 and the vertical plate 12 to be stably fixed before the adhesive is fully hardened, effectively preventing relative displacement that may occur during the subsequent high-temperature main curing process. Step S42 ensures that the chemical reaction of the adhesive is fully carried out at a higher temperature, thereby enabling the adhesive to achieve its designed optimal mechanical strength, thermal conductivity, magnetic conductivity, and durability. Maintaining the pressure for alignment pressing throughout the pre-curing and main curing processes ensures uniform adhesive layer thickness, effectively eliminates air bubbles, and maintains tight contact at the bonding interface, thereby significantly improving the bonding quality. Step S43 is performed while maintaining or reducing the compressive force, which allows the composite yoke structure to cool down slowly and uniformly, avoiding thermal shock and internal stress caused by rapid cooling, thereby effectively preventing defects such as structural warping, cracking or adhesive layer detachment.

[0055] By employing the aforementioned phased adhesive curing technology, this application significantly improves the bonding quality and reliability of the speaker's composite yoke structure. Specifically, the pre-curing step effectively prevents component displacement during high-temperature curing, ensuring alignment accuracy; the main curing step ensures the full utilization of the adhesive's performance, resulting in optimal bond strength and thermal and magnetic conductivity; and the controlled cooling process effectively reduces internal stress, preventing structural deformation or cracking caused by thermal stress. Consequently, the resulting composite yoke structure exhibits a more uniform adhesive layer, higher bond strength, lower internal stress, and superior dimensional stability, thereby significantly extending the speaker's lifespan and enhancing its overall performance.

[0056] In some preferred embodiments, the first preset temperature is 60-80°C and the second preset temperature is 110-130°C.

[0057] Specifically, the first preset temperature refers to the temperature range used in the adhesive pre-curing stage, with a preferred value of 75°C. This temperature range aims to initially soften the adhesive and initiate the cross-linking reaction, preparing it for the subsequent main curing stage, while avoiding excessively high temperatures that could lead to premature early curing or excessive solvent evaporation. The second preset temperature refers to the temperature range used in the adhesive main curing stage, with a preferred value of 125°C. This temperature is higher than the first preset temperature, aiming to accelerate the complete cross-linking of the adhesive, ensuring the formation of a stable polymer network structure, thereby achieving optimal bond strength and performance. The pressing force is preferably 5N, which is set as the precise pressure applied to the subyoke 2 and the vertical plate 12 during the bonding process. Its purpose is to ensure that the adhesive is evenly spread, fully wets the bonding surface, and effectively eliminates any micro-air bubbles that may exist inside the adhesive layer, thereby improving the density and bonding strength of the bonding interface. The adhesive pre-curing time is preferably 20 minutes, which is used to allow the adhesive to initially cure at the first preset temperature, forming a certain strength to maintain the relative position of the components in subsequent operations. The primary curing time of the adhesive is preferably 60 minutes. This time is used to allow the adhesive to fully cure at the second preset temperature, achieving its final mechanical properties and chemical stability. The cooling rate in step S43 is preferably 1°C / minute. This rate is designed to control the cooling speed of the assembly after curing, avoiding excessive thermal stress caused by rapid cooling, thereby reducing the risk of component deformation or adhesive layer cracking. The target cooling temperature is preferably below 50°C. This is to ensure that the assembly has been sufficiently cooled to near room temperature before the pressure is released, preventing component deformation or adhesive layer damage that may occur when the pressure is released at high temperatures.

[0058] More specifically, the solution of this application effectively solves the potential problems caused by parameter uncertainties in the aforementioned technical basis by precisely setting various key parameters in the adhesive curing process. Specifically, the first preset temperature is set in the range of 60-80℃, allowing the adhesive to gently begin cross-linking in the pre-curing stage, avoiding stress concentration or uneven curing within the adhesive layer due to excessively high temperatures. Subsequently, the second preset temperature is increased to 110-130℃ to ensure that the adhesive can fully and thoroughly complete the cross-linking reaction in the main curing stage, thereby forming a high-strength, high-stability adhesive layer. Throughout the curing process, by applying a precise 5N pressing force, the adhesive can be effectively promoted to spread evenly, fully fill the microscopic voids at the bonding interface, and expel any possible microbubbles, greatly improving the density and bonding strength of the bonding interface. At the same time, the setting of a pre-curing time of 20 minutes and a main curing time of 60 minutes is based on the chemical reaction kinetics of the adhesive, ensuring sufficient time for the corresponding curing reaction to complete at different temperature stages. Finally, by controlling the cooling rate of the cooling process to 1℃ / minute and keeping the target cooling temperature below 50℃, the thermal stress concentration caused by rapid cooling was effectively avoided, thereby reducing the risk of warping, deformation or cracking of the adhesive layer in the composite yoke structure during the cooling process, and ensuring the dimensional accuracy and structural integrity of the final product.

[0059] In some preferred embodiments, step S4 is specifically implemented as follows: First, in step S41, the assembly consisting of the sub-yoke 2 and the vertical plate 12 is placed in a heating platform or oven. While maintaining a pressure of 5N, the temperature is precisely controlled at 75°C for adhesive pre-curing for 20 minutes. During this stage, the adhesive begins to soften and undergoes a preliminary cross-linking reaction, forming a certain degree of stickiness to ensure the initial fixation of the components.

[0060] Subsequently, in step S42, while maintaining a pressure of 5N, the temperature is increased to 125°C for primary curing of the adhesive, lasting for 60 minutes. During this stage, the cross-linking reaction of the adhesive is accelerated and fully completed, forming strong chemical bonds and maximizing the bond strength.

[0061] Finally, in step S43, while maintaining a pressing force of 5N or appropriately reducing the pressing force, the assembly is cooled at a cooling rate of 1°C / min until the temperature of the assembly drops below 50°C. This controlled cooling process helps release internal stress and prevents uneven material shrinkage or structural deformation caused by a sudden drop in temperature, thereby obtaining a composite yoke structure with excellent bonding properties and dimensional stability.

[0062] Thirdly, please refer to Figure 3Some embodiments of this application also provide a loudspeaker, including the composite yoke structure of the loudspeaker as provided in the first aspect, or including the composite yoke structure of the loudspeaker manufactured by a method based on the composite yoke structure of the loudspeaker as provided in the first aspect.

[0063] Specifically, the loudspeaker also includes components such as a diaphragm, voice coil, bracket, washer, and magnet. This application aims to improve the yoke structure. The installation and use of the other components can be consistent with the prior art, so they will not be described in detail here.

[0064] More specifically, the loudspeaker of this application effectively solves the limitations of traditional loudspeakers in terms of magnetic circuit performance and structural stability by integrating the aforementioned composite yoke structure. Specifically, the secondary yoke 2 in the composite yoke structure is bonded and fixed to the outer surface of the vertical plate portion 12 of the main yoke 1, which allows the magnetic circuit to form a more optimized magnetic flux path in the yoke portion. The introduction of the secondary yoke 2, especially its thickness design, effectively enhances the permeability in the magnetic circuit, thereby improving the magnetic field strength and uniformity at the magnetic gap. It is precisely because of the increased magnetic field strength that the voice coil can generate a greater driving force under the same current drive, thus improving the electroacoustic conversion efficiency of the loudspeaker. Furthermore, through the aforementioned manufacturing methods, particularly surface cleaning, micro-etching treatment, and precision bonding and curing using a thermally and magnetically conductive dual-function adhesive, a strong and magnetically conductive bond is formed between the main yoke 1 and the secondary yoke 2. This bond not only improves the overall mechanical strength and stability of the composite yoke structure but also further optimizes magnetic flux transmission and reduces magnetic resistance, thereby ensuring that the loudspeaker maintains stable performance even during long-term operation or high-power output.

[0065] The above are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A composite yoke structure for a loudspeaker, characterized in that, The composite yoke structure includes a main yoke and a secondary yoke. The main yoke includes an integrally formed base plate and a vertical plate formed by bending upward along the edge of the base plate. The thickness of the base plate and the thickness of the vertical plate are the same. The secondary yoke covers and is bonded to the outer surface of the vertical plate.

2. The composite yoke structure of the loudspeaker according to claim 1, characterized in that, The secondary yoke is plate-shaped, and its thickness is greater than or equal to the thickness of the vertical plate.

3. The composite yoke structure of the loudspeaker according to claim 1, characterized in that, There are four vertical plates, which 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.

4. A method for manufacturing a composite yoke structure for a loudspeaker, characterized in that, The method includes the following steps: S1. Prepare a main yoke and a secondary yoke. The main yoke includes an integrally formed base plate and a vertical plate formed by bending upward along the edge of the base plate. The thickness of the base plate and the thickness of the vertical plate are the same. S2. Perform surface cleaning treatment on the outer side of the vertical plate; S3. Use adhesive to cover and bond the subyoke iron to the outer side of the vertical plate, and perform alignment and pressing treatment. S4. Cure the adhesive to obtain the composite yoke structure of the loudspeaker.

5. The method for manufacturing the composite yoke structure of the loudspeaker according to claim 4, characterized in that, The method further includes steps performed between steps S2 and S3: S21. Perform micro-etching treatment on the outer surface of the vertical plate.

6. The method for manufacturing the composite yoke structure of the loudspeaker according to claim 4, characterized in that, The adhesive is a thermally and magnetically conductive dual-function adhesive filled with soft magnetic powder with high magnetic permeability.

7. The method for manufacturing the composite yoke structure of the loudspeaker according to claim 4, characterized in that, The alignment and pressing process in step S3 includes: The subyoke and the vertical plate are aligned using the pre-set alignment features and / or alignment platforms on the subyoke and the vertical plate, and the subyoke and the vertical plate are pressed together based on a pre-set pressing force.

8. The method for manufacturing the composite yoke structure of the loudspeaker according to claim 4, characterized in that, Step S4 includes: S41. While maintaining the pressing force of the alignment pressing process, the adhesive is pre-cured on the assembly of the subyoke and the vertical plate based on a first preset temperature. S42. While maintaining the pressing force of the alignment pressing process, the assembly is subjected to primary curing of the adhesive based on a second preset temperature, wherein the second preset temperature is higher than the first preset temperature. S43. Cool the assembly while maintaining the pressing force of the alignment pressing process or under a holding pressure lower than the pressing force.

9. The method for manufacturing the composite yoke structure of the loudspeaker according to claim 8, characterized in that, The first preset temperature is 60-80℃, and the second preset temperature is 110-130℃.

10. A loudspeaker, characterized in that, The composite yoke structure of the loudspeaker as described in any one of claims 1-3, or the composite yoke structure of the loudspeaker manufactured based on the method for manufacturing the composite yoke structure of the loudspeaker as described in any one of claims 4-9.

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