A concave rectangular magnetic yoke with pressure

Abstract

This utility model relates to the field of loudspeaker technology, and in particular to a rectangular magnetic cover with indentations, comprising a magnetic cover body. The magnetic cover body has a plurality of indentations evenly arranged on the side surface of the magnetic cover body that contacts the magnet. All the indentations are filled with adhesive. The structure of this utility model can effectively absorb and buffer the impact force during the drop process, reduce the risk of magnet detachment and failure of the loudspeaker during drop tests, roller tests and consumer use, avoid permanent damage to the loudspeaker, and improve customer satisfaction.

Description

Technical Field

[0001] This utility model relates to the field of loudspeaker technology, specifically to a rectangular magnetic cover with a concave shape. Background Technology

[0002] As a core component in electroacoustic conversion, the structural reliability of loudspeakers directly impacts the performance of audio equipment. In traditional loudspeaker structures, the assembly of the magnet and the cover primarily uses a planar contact joint. This design has significant manufacturing defects: First, the smooth contact surface makes it difficult to form an effective adhesive accumulation area, leading to uneven adhesive distribution. Second, under vibration conditions, the planar contact structure is prone to stress concentration, accelerating adhesive aging. More seriously, the existing magnet cover's adhesive surface lacks a reasonable structural design, making it prone to air bubbles and voids during adhesive curing. This not only reduces bond strength but also causes micro-cracks due to differences in thermal expansion coefficients during temperature changes. These problems ultimately lead to magnet loosening or even detachment during long-term use, such as from impacts, severely affecting product lifespan and sound quality stability. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a rectangular magnetic cover with a pressure-recessed design.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a rectangular magnetic cover with indentations, comprising a magnetic cover body, wherein a plurality of indentations are uniformly arranged on the side surface of the magnetic cover body that contacts the magnet, and all the indentations are filled with adhesive.

[0005] In some embodiments, the magnetic shield body is a single-magnetic-structure magnetic shield.

[0006] In some embodiments, a groove for a central magnet is provided on the central surface of the single-magnetic structure magnetic cover.

[0007] In some embodiments, the magnetic shield body is a multi-magnetic structure magnetic shield.

[0008] In some embodiments, the multi-magnetic structure magnetic cover has a matching groove on the surface of each magnet bonding joint.

[0009] In some embodiments, the groove is a rectangular groove, and the opening of a single rectangular groove is smaller than the surface of the mating magnet.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The rectangular concave micro-features of the magnetic cover are evenly arranged in an array along the XY direction. When the magnet and the magnetic cover are glued together, the concave rectangular features can store more glue, which facilitates the even spread of glue during the gluing process of the magnetic cover and the magnet. This increases the thickness and volume of the glue, which can effectively absorb and buffer the impact force during the drop process, reduce the risk of magnet detachment and failure of the speaker during drop tests, roller tests and consumer use, avoid permanent damage to the speaker, and improve customer satisfaction.

[0011] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. The embodiments of this application will provide a detailed description and understanding of the application. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the surface structure of the single-magnetic structure magnetic cover of this utility model;

[0013] Figure 2 This is a schematic diagram of the magnet and magnetic cover of this utility model.

[0014] Figure 3 This is a schematic diagram of the surface structure of the multi-magnetic structure magnetic shield of this utility model;

[0015] Figure 4 This is a cross-sectional view of the bonding between the magnet and the magnetic cover of this utility model.

[0016] In the diagram: 1. Magnetic cover body; 2. Indentation groove; 3. Magnet. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In existing technologies, the magnet and magnet cover in speaker components are bonded through planar contact. Adhesive is difficult to accumulate effectively on a flat surface, resulting in uneven adhesive layer distribution. Due to the lack of guiding structures on the bonding surface, the adhesive easily flows outwards or accumulates locally, causing insufficient bond strength. When the device is subjected to vibration or temperature changes, the magnet may detach due to adhesive layer breakage.

[0019] To address the aforementioned issues, the distribution of the adhesive on the bonding surface needs to be improved. Analysis of the adhesive flow characteristics revealed that planar contact cannot provide sufficient space for the adhesive, resulting in insufficient effective bonding area. To solve this problem, a regularly distributed recessed structure was designed on the magnetic cover surface, allowing the adhesive to fill the recessed areas evenly. Further research showed that the recessed structure not only increases the amount of adhesive stored but also controls the direction of adhesive flow through surface tension, thereby forming a continuous and uniformly thick adhesive layer.

[0020] Therefore, as Figure 1-2 As shown, this application proposes a rectangular magnetic cover with indentations, which includes a magnetic cover body. The magnetic cover body has a plurality of indentations uniformly arranged on the side surface of the magnetic cover body that contacts the magnetic steel. All the indentations are filled with adhesive.

[0021] The magnetic cover body refers to the metal or alloy component covering the surface of the magnet, which can be made of stamped ferrite material, and its shape matches the assembly area of ​​the magnet. The indentation grooves are recessed structures evenly distributed on the contact surface between the magnetic cover and the magnet. These can be created by stamping rectangular pits into the surface of the magnetic cover, with a depth of 0.1-0.3 mm, to accommodate adhesive and restrict its flow. Adhesive filling refers to the injection of epoxy resin or acrylic adhesive into the indentation grooves. This can be achieved using a dispensing device to inject a precise amount of adhesive, ensuring a consistent amount in each indentation groove.

[0022] Specifically, during assembly, the magnetic cover body adheres to the surface of the magnet, and the recessed area formed by the indentation groove constitutes an adhesive storage space. When adhesive is injected into the indentation groove, it diffuses outwards due to capillary action, but due to the constraint of the groove walls, the adhesive is mainly evenly distributed along the extension direction of the groove. During the pressurized assembly of the magnet, excess adhesive is squeezed into adjacent indentations, forming an interconnected adhesive network. After curing, the adhesive exists simultaneously inside the indentation groove and in the gaps between the contact surfaces, forming a multi-point anchoring structure.

[0023] Compared to existing technologies, traditional planar contact relies solely on surface-applied adhesive, and the adhesive layer thickness is greatly affected by assembly pressure, easily leading to localized adhesive shortages. This solution, however, utilizes the physical restraint of grooves to ensure a minimum amount of adhesive at each bonding point, while the groove arrangement guides the adhesive to form an orderly distribution.

[0024] Through the above technical solution, this application effectively increases the effective contact area of ​​the adhesive between the magnet and the magnetic cover, avoiding excessive extrusion of the adhesive during assembly. The adhesive forms a stable support structure within the groove, significantly improving the shear resistance of the adhesive layer, thereby reducing the risk of the magnet falling off under vibration.

[0025] This application further proposes that the magnetic shield body is a single-magnetic structure magnetic shield, and a pressure groove for a central magnet is provided on the central surface of the single-magnetic shield.

[0026] Among them, the single-magnet structure magnetic cover refers to a magnetic cover structure that only cooperates with a single magnet. Specifically, it can be made of metal or engineering plastic through stamping or injection molding processes, and its overall structure is designed to match the surface shape of the single magnet. This structure, by limiting the correspondence between the magnetic cover and the single magnet, allows the arrangement of the indentation grooves and the adhesive filling process to focus on a single bonding surface, thereby avoiding the problem of uneven glue filling caused by the difference in magnet distribution in multi-magnet structures.

[0027] Specifically, the single-magnetic structure magnetic cover features grooves on its surface that contact the magnet, corresponding to the magnet's position. This design allows the adhesive to be filled within these grooves, and the groove structure restricts the flow of the adhesive. When the magnet contacts the cover body, the adhesive is compressed within the grooves and overflows outwards, forming a continuous adhesive seal layer at the magnet's edge. Simultaneously, the uniform distribution of the grooves disperses the shrinkage stress generated during adhesive curing, reducing the risk of bond failure due to localized stress concentration.

[0028] Compared to existing technologies, conventional magnetic covers typically use a planar contact method to bond with magnets. The adhesive adheres to the contact surface solely through surface tension, which can easily lead to insufficient bonding strength due to uneven adhesive layer thickness or missing adhesive at the edges. This solution, however, uses a single-magnetic structure magnetic cover in conjunction with a pressure groove to confine the adhesive within a predetermined area. The groove structure guides the adhesive to form a uniform filling pattern under pressure, thereby significantly improving bonding reliability.

[0029] Through the above technical solution, this application solves the problem of easy magnet detachment caused by uneven glue distribution in traditional planar contact magnetic covers. By combining the single magnetic structure with the groove, the groove restricts the flow path of the glue and reserves space for the glue, so that the glue layer forms a complete cover between the magnet and the magnetic cover. This ensures that the glue forms a continuous and stable adhesive layer between the magnet and the magnetic cover, thereby reducing the risk of magnet detachment due to local glue delamination, and thus improving the long-term stability of the speaker assembly.

[0030] like Figure 3 As shown, this application further proposes that the magnetic cover body is a multi-magnetic structure magnetic cover, and the multi-magnetic structure magnetic cover has a matching groove on the surface of each magnet bonding joint.

[0031] Among them, the multi-magnetic structure magnetic cover refers to a structure composed of multiple independent magnets. Each magnet is designed with a separate corresponding installation area on the magnetic cover body. Specifically, this can be achieved by dividing the magnetic cover body into multiple independent magnet accommodating areas through a stamping process. This structure allows each magnet to form an independent pressure groove filling space on the contact surface with the magnetic cover, making the adhesive distribution more concentrated and controllable.

[0032] Specifically, the surface of the multi-magnetic structure magnetic cover is divided into multiple independent bonding areas based on the arrangement of the magnets. Each bonding area has a groove on its surface that matches the shape of the magnet. When the magnet is installed, its bottom surface is embedded in the corresponding groove. The adhesive, restricted by the groove structure, evenly fills the gap between the magnet and the sidewall of the groove. Because each magnet corresponds to an independent groove, the adhesive will not have thickness differences due to interference between adjacent areas during the curing process.

[0033] Compared to existing technologies, traditional magnetic covers use a single magnetic structure, which allows adhesive to easily spread to non-adhesive areas on a continuous plane, resulting in insufficient effective bonding area. In contrast, multi-magnetic structures form multiple independent bonding units through physical separation, confining the adhesive within a designated groove and avoiding uneven adhesive layer problems caused by surface tension.

[0034] Through the above technical solution, this application can provide a directional adhesive filling path for each magnet, ensuring that the adhesive forms a uniform adhesive layer simultaneously on multiple magnet contact surfaces, thereby reducing the risk of magnet detachment due to insufficient local adhesive.

[0035] like Figure 1-4 As shown, this application further proposes that the groove is a rectangular groove, and the opening surface of a single rectangular groove is smaller than the surface of the mating magnet.

[0036] The embossed rectangular groove refers to a recessed structure with a regular geometric shape machined onto the surface of the magnetic cover body. This can be achieved using stamping or milling processes. The geometric features of this structure allow the adhesive to form a regular flow path during filling. The opening area being smaller than the mating magnet surface means that the opening area of ​​the embossed rectangular groove on the magnetic cover body is smaller than the surface area of ​​the contact area between the magnet and the magnetic cover. This can be achieved by adjusting the dimensions of the stamping die or the machining parameters of the milling cutter. This design limits the diffusion range of the adhesive during the bonding process.

[0037] Specifically, the regular geometry of the embossed rectangular groove allows the adhesive to form a uniformly distributed bonding layer during the filling process. When the magnet is assembled with the magnetic cover, the adhesive is confined within the embossed rectangular groove, and the design of the opening surface being smaller than the magnet surface promotes an accumulation effect of the adhesive within the groove. During the curing process, the contact area between the adhesive and the magnet is three-dimensionally covered by the sidewalls of the groove, preventing the adhesive from remaining only in the planar contact area.

[0038] Compared to existing technologies, traditional magnetic covers use a planar contact method, which prevents adhesive from effectively adhering. This solution, however, uses a recessed rectangular groove to constrain the adhesive flow direction. In existing technologies, the contact area between the magnet and the magnetic cover is equal to the opening surface. This solution reduces the opening surface to create an adhesive-accommodating space, significantly improving the uniformity of the adhesive layer thickness with the same amount of adhesive used.

[0039] Through the above technical solution, this application solves the problem of uneven adhesive distribution on the bonding surface between the magnet and the magnetic cover. The structure of the recessed rectangular groove creates a mechanical interlocking effect after the adhesive cures, effectively improving the bonding strength. Controlling the size of the opening surface prevents excessive adhesive overflow, ensuring complete coverage of the adhesive layer on the edge area of ​​the magnet, thereby reducing the risk of magnet detachment.

[0040] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rectangular magnetic cover with a dented design, characterized in that: The device includes a magnetic cover body. On one side of the magnetic cover body, which is in contact with the magnet, several grooves are evenly arranged. All the grooves are filled with adhesive. The grooves are rectangular grooves, and the opening of a single rectangular groove is smaller than the surface of the mating magnet.

2. The rectangular magnetic cover with a dented design according to claim 1, characterized in that: The magnetic shield body is a single-magnetic-structure magnetic shield.

3. A rectangular magnetic cover with a dented indentation according to claim 2, characterized in that: The single-magnetic structure magnetic cover has a groove on its central surface that mates with the central magnet.

4. A rectangular magnetic cover with a dented design according to claim 1, characterized in that: The magnetic shield body is a multi-magnetic structure magnetic shield.

5. A rectangular magnetic cover with a dented design according to claim 4, characterized in that: The multi-magnetic structure magnetic cover has matching grooves on the surface of each magnet bonding joint.

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