Antimagnetic loudspeaker

Abstract

The antimagnetic loudspeaker comprises a cavity shell made of a BOX plastic material, a panel made of a BOX plastic material, a rear cover made of a BOX plastic material, an antimagnetic plate made of an SPCC material and a single body, the antimagnetic plate and the single body are arranged in the cavity shell, the panel is arranged at the front end of the cavity shell, the rear cover is arranged at the rear end of the cavity shell, and the single body is arranged in the cavity shell. The anti-magnetic plate comprises a magnetic conductive closed ring, a magnet and a magnetic plate, the magnetic conductive closed ring wraps the periphery of the magnet, the magnetic plate is arranged on the outer side of the magnetic conductive closed ring, and chamfers are formed at the corners of the magnetic conductive closed ring. The antimagnetic loudspeaker is simple in structure, low in cost and excellent in antimagnetic performance.

Description

Technical Field

[0001] This utility model relates to the technical field of electroacoustic devices, and in particular to a magnetically shielded loudspeaker. Background Technology

[0002] When traditional loudspeakers are in operation, the magnetic circuit system generates a strong leakage magnetic field, which may interfere with surrounding sensitive electronic components. Existing anti-magnetic solutions mostly use external magnetic shielding covers or low-magnetic boards, but these have problems such as high cost, large size, and poor sound quality.

[0003] SPCC (Spectrum Ceramic Fiber) magnetic shields are an important component in traditional loudspeakers. The corners of the magnetically conductive closed loop within the magnetic shield are typically rounded at angle α (see...). Figure 5 Although the rounded corner 'a' is smooth, the SPCC material undergoes plastic deformation under mold pressure during molding, resulting in a rounded radius in the material transition area. Magnetic leakage may occur at the chamfered corner of the SPC. Furthermore, since magnetic flux measurement is done at a fixed point to confirm its magnitude, the magnetic flux at the rounded corner will accumulate, causing the magnetic flux at that point to be larger than expected. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a magnetically shielded loudspeaker with simple structure, low cost and excellent magnetic shielding performance.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a magnetically shielded loudspeaker, including a BOX plastic cavity shell, a BOX plastic panel, a BOX plastic back cover, an SPCC magnetically shielded plate, and a driver. The magnetically shielded plate and the driver are disposed inside the cavity shell. The panel is disposed at the front end of the cavity shell, and the back cover is disposed at the rear end of the cavity shell. The magnetically shielded plate includes a magnetically conductive closed ring, a magnet, and a magnetic plate. The magnetically conductive closed ring wraps around the magnet, and the magnetic plate is disposed outside the magnetically conductive closed ring. Chamfers are formed at the corners of the magnetically conductive closed ring.

[0006] To be further specific, in the above technical solution, the magnetically conductive closed loop is made of soft iron.

[0007] To be further specific, in the above technical solution, the thickness of the magnetically conductive closed loop is 3±0.05mm.

[0008] To be further specific, in the above technical solution, the gap between the magnetically conductive closed loop and the magnet is less than or equal to 5 mm.

[0009] To be further specific, in the above technical solution, the thickness of the magnetic plate is 3±0.05mm, and the magnetic plate is fixed to the outside of the magnetically conductive closed ring by injection molding.

[0010] To be further specific, in the above technical solution, the antimagnetic plate and the cavity shell are injection molded into an integral structure.

[0011] To be further specific, in the above technical solution, the cavity shell and the panel are ultrasonically welded into an integral structure.

[0012] To be further specific, in the above technical solution, the cavity shell and the rear cover are ultrasonically welded into an integral structure.

[0013] The beneficial effects of this utility model are as follows: This anti-magnetic speaker is an audio output device specifically designed for modern electronic devices. It has superior performance and is suitable for electronic devices that need to avoid magnetic field interference, especially tablet computers. It has anti-magnetic function and can effectively prevent magnetic fields from interfering with other electronic devices. The anti-magnetic speaker achieves its anti-magnetic effect through magnetic shielding and optimized magnetic circuit design. Specifically, it uses SPCC material anti-magnetic plate injection molding on BOX plastic shell. The SPCC material is combined with BOX plastic material, and the corners of the SPCC material anti-magnetic plate are transformed from traditional rounded corners to chamfered corners to achieve the anti-magnetic effect, reduce magnetic field leakage, and ensure compatibility with other electronic devices. The magnetic shielding of the speaker for the entire screen surface is less than 5MT. In projects that require anti-magnetic shielding of less than 5MT, this anti-magnetic speaker can be selected to meet customers' high requirements for anti-magnetic performance. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 yes Figure 1 A schematic diagram of the decomposed structure;

[0017] Figure 3 This is a schematic diagram of the structure of the antimagnetic plate in this utility model;

[0018] Figure 4 yes Figure 3 The front view;

[0019] Figure 5 This is a schematic diagram of the structure of a traditional antimagnetic plate.

[0020] The labels in the diagram are: 1. Panel; 2. Back cover; 3. Antimagnetic plate; 31. Chamfer; 4. Unit; a. Rounded corner. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model discloses a magnetically shielded loudspeaker, comprising a BOX plastic cavity shell, a BOX plastic panel 1, a BOX plastic rear cover 2, an SPCC magnetically shielded plate 3, and a driver 4. The magnetically shielded plate 3 and driver 4 are disposed inside the cavity shell. The panel 1 is disposed at the front end of the cavity shell, and the rear cover 2 is disposed at the rear end of the cavity shell. The magnetically shielded plate 3 comprises a magnetically conductive closed ring, a magnet, and a magnetic plate. The magnetic plate can also be referred to as a magnetic material or a magnetically conductive material. The magnetically conductive closed ring wraps around the magnet, and the magnetic plate is disposed on the outside of the magnetically conductive closed ring. Chamfers 31 are formed at the corners of the magnetically conductive closed ring.

[0023] The corners of the magnetically conductive closed loop are designed with a 31° chamfer, which has the following advantages:

[0024] 1. Magnetic circuit continuity optimization: Chamfer 31 is usually a 45° bevel. By beveling the corner, the connection between adjacent surfaces is made tighter, reducing abrupt changes in the magnetic circuit, ensuring that the magnetic field lines are conducted more smoothly along the inside of the material, and reducing the risk of leakage.

[0025] II. Ease of processing: Chamfering 31 is easier to process. Chamfering is easier to achieve high-precision processing than small radius rounded corners. Especially in thinner plates, chamfering can avoid material deformation or cracking caused by stamping or bending, and ensure uniform material thickness at the edges and corners.

[0026] 3. Reduce stress concentration: Cold-rolled SPCC magnetic closed loops are prone to stress during processing. The 31 chamfer can disperse the stress, reduce the local decrease in magnetic permeability, and thus maintain better magnetic permeability.

[0027] IV. Magnetic Field Distribution Adjustment: The chamfered design of 31 may change the distribution of the edge magnetic field, making the magnetic field more concentrated inside the material rather than at the tip, reducing edge leakage. For low-frequency magnetic field shielding, the priority of structural continuity is higher than the electric field concentration effect of sharp edges. In other words, the measurement of magnetic flux is to confirm the magnitude of magnetic flux at a fixed point. The chamfer of 31 will disperse the magnetic flux, thereby achieving a magnetic flux of less than 5MT.

[0028] V. Sealing of splicing: In scenarios where multiple antimagnetic plates are spliced ​​together, the 31 chamfer design facilitates welding or bonding, reduces assembly gaps, avoids magnetic leakage caused by gaps, and improves the overall shielding effectiveness.

[0029] VI. Local thickening effect: The 31 chamfering process may create a thicker material cross section at the corner, enhancing the local magnetic conductivity and further suppressing leakage.

[0030] Among them, the BOX plastic cavity shell, BOX plastic panel 1, and BOX plastic back cover 2 have the advantages of lightweight, design freedom, controllable cost, and customizable functions. Through reasonable material selection and process combination, they can meet diverse needs from consumer to industrial levels. The SPCC antimagnetic plate 3 has the advantages of low cost, high rigidity, easy processing, and low-frequency magnetic permeability, making it suitable for the structural magnetic shielding needs of power frequency equipment.

[0031] The magnetic closed loop is made of soft iron, which is low-carbon steel or industrial pure steel with a carbon content of less than 0.1%, few impurities, soft texture, easy magnetization, and high magnetic permeability, making it suitable for static or low-frequency magnetic field applications.

[0032] The thickness of the magnetic closed loop is 3±0.05mm. This thickness of the magnetic closed loop provides sufficient cross-sectional area to ensure the high efficiency of magnetic flux transmission in the magnetic circuit. Soft iron itself has high permeability, and the appropriate thickness can further reduce magnetic resistance, reduce leakage flux, and improve the overall magnetic circuit efficiency. In low-frequency scenarios, this thickness will not significantly increase eddy current loss, while maintaining high permeability.

[0033] The gap between the magnetic closed loop and the magnet is less than or equal to 5mm. According to the magnetic reluctance formula, the air gap is the main source of magnetic reluctance in the magnetic circuit. Reducing the air gap can significantly reduce magnetic reluctance and increase magnetic permeability. The small air gap can suppress the diffusion of magnetic flux from the edge of the air gap, reduce leakage magnetic loss, and improve energy transfer efficiency.

[0034] The magnetic plate has a thickness of 3±0.05mm. It is fixed to the outside of the magnetically conductive closed ring by injection molding. The injection molding process can directly combine the magnetic plate and the magnetically conductive closed ring, eliminating the multi-step assembly of traditional gluing or mechanical fixing, significantly improving production efficiency. Injection molding can fill the irregular grooves, curved surfaces or thin-walled structures of the magnetically conductive closed ring, realizing complex magnetic circuit designs that are difficult to achieve by traditional processes, improving magnetic field uniformity. The injection molding process can reduce air gaps and interface defects through uniform filling, reduce the overall magnetic resistance of the magnetic circuit, and improve magnetic permeability efficiency.

[0035] The antimagnetic plate 3 and the cavity shell are injection molded into a single structure. It should be further noted that after the antimagnetic plate 3 is stamped and fully electroplated, it is injection molded together with the cavity shell to form a single structure. The stamping process is suitable for mass production of the antimagnetic plate 3, allowing for the one-time molding of complex shapes using molds, which is far more efficient than cutting or welding processes. The injection molding process simultaneously integrates the antimagnetic plate 3 with the cavity shell, reducing assembly steps and lowering labor and time costs. Furthermore, the electroplating layer improves the conductivity and corrosion resistance of the antimagnetic plate, forming a continuous conductive interface with the cavity shell after injection molding, reducing electromagnetic leakage caused by gaps.

[0036] The cavity shell and panel 1 are ultrasonically welded into a single structure, and the cavity shell and back cover 2 are ultrasonically welded into a single structure. Ultrasonic welding generates heat through high-frequency vibration and friction, causing the plastic on the contact surface to melt and re-solidify, forming a fusion at the molecular level. The bonding strength is close to that of the raw materials themselves, far exceeding that of adhesive or mechanical fixation.

[0037] This magnetically shielded speaker is an audio output device specifically designed for modern electronic devices. It boasts superior performance and is suitable for electronic devices requiring protection from magnetic field interference, particularly tablets. Its magnetic shielding effectively prevents magnetic fields from interfering with other electronic devices. The speaker achieves this through magnetic shielding and optimized magnetic circuit design. Specifically, it uses SPCC material to mold a magnetic shielding plate 3 onto a BOX plastic shell. The SPCC material is integrated with the BOX plastic material, and the corners of the SPCC material magnetic shielding plate 3 are transformed from traditional rounded corners to chamfered corners to achieve the magnetic shielding effect, reduce magnetic field leakage, and ensure compatibility with other electronic devices. The speaker provides less than 5MT of magnetic shielding for the entire screen surface. This magnetically shielded speaker is ideal for projects requiring magnetic shielding below 5MT, meeting customers' high demands for magnetic shielding performance.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A magnetically shielded loudspeaker, characterized by: The cavity shell includes a BOX plastic material, a BOX plastic material panel (1), a BOX plastic material back cover (2), a SPCC material anti-magnetic plate (3) and a single body (4), the anti-magnetic plate (3) and the single body (4) are arranged in the cavity shell, the panel (1) is arranged at the front end of the cavity shell, the back cover (2) is arranged at the rear end of the cavity shell, the anti-magnetic plate (3) includes a magnetic closed loop, a magnet and a magnetic plate, the magnetic closed loop is wrapped around the periphery of the magnet, the magnetic plate is arranged outside the magnetic closed loop, and the corners of the magnetic closed loop are all formed with chamfers.

2. The magnetically shielded loudspeaker of claim 1, wherein: The magnetic closed loop is made of soft iron.

3. The magnetically shielded loudspeaker of claim 1, wherein: The thickness of the magnetic closed loop is 3±0.05mm.

4. The magnetically shielded loudspeaker of claim 1, wherein: The gap between the magnetic closed loop and the magnet is less than or equal to 5mm.

5. The magnetically shielded loudspeaker of claim 1, wherein: The thickness of the magnetic plate is 3±0.05mm, and the magnetic plate is fixed to the outside of the magnetic closed loop by injection molding.

6. The magnetically shielded loudspeaker of claim 1, wherein: The anti-magnetic plate (3) and the cavity shell are integrally formed by injection molding.

7. The magnetically shielded loudspeaker of claim 1, wherein: The cavity shell and the panel (1) are integrally formed by ultrasonic welding.

8. The magnetically shielded loudspeaker of claim 1, wherein: The cavity shell and the back cover (2) are integrally formed by ultrasonic welding.

Images