Electroacoustic transduction device

Abstract

The utility model discloses an electroacoustic transduction device, relates to the electronic equipment technical field, the electroacoustic transduction device comprises a support, a magnetic circuit assembly and a voice coil, the support is provided with a vibrating diaphragm, the magnetic circuit assembly is provided with a magnetic gap, the voice coil comprises a plurality of connecting parts which are successively connected end to end, each connecting part is connected with the vibrating diaphragm, and the connecting parts are connected with the vibrating diaphragm. At least part of each connecting part is arranged in the magnetic gap in a penetrating manner; the at least one connecting part comprises a first connecting section, a second connecting section, a third connecting section, a fourth connecting section and a fifth connecting section which are connected in sequence, and the second connecting section, the third connecting section and the fourth connecting section define a sunken space which is sunken towards the interior of the voice coil; the second connecting section and the fourth connecting section incline from the side close to the third connecting section to the side away from the third connecting section in the extending direction of the third connecting section.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment technology, and in particular to an electroacoustic transducer. Background Technology

[0002] In modern electronic devices, electroacoustic transducers are used to convert electrical signals into sound signals and vice versa, and are applied in fields such as loudspeakers, headphones, and electroacoustic musical instruments. However, traditional electroacoustic transducers are prone to causing sound distortion during electroacoustic conversion, resulting in the sound losing its original timbre and texture.

[0003] Therefore, it is necessary to provide a new electroacoustic transducer to solve the above-mentioned technical problems. Utility Model Content

[0004] The main purpose of this utility model is to provide an electroacoustic transducer, which aims to solve the technical problem that electroacoustic transducers are prone to causing sound distortion.

[0005] To achieve the above objectives, this utility model proposes an electroacoustic transducer, comprising:

[0006] support;

[0007] A diaphragm, wherein the diaphragm is disposed on the support;

[0008] A magnetic circuit assembly, wherein the magnetic circuit assembly is provided with a magnetic gap;

[0009] The voice coil includes a plurality of connecting portions that are connected end to end in sequence and surround a through hole, each of the connecting portions being connected to the diaphragm, and at least a portion of each of the connecting portions passing through the magnetic gap;

[0010] At least one of the connecting portions includes a first connecting segment, a second connecting segment, a third connecting segment, a fourth connecting segment, and a fifth connecting segment connected in sequence. The second connecting segment, the third connecting segment, and the fourth connecting segment together form a recessed space that is recessed into the voice coil. The second connecting segment and the fourth connecting segment are both inclined from the side closer to the third connecting segment to the side farther away from the third connecting segment along the extending direction of the third connecting segment. Attached Figure Description

[0011] 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 of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0012] Figure 1A schematic diagram of the electroacoustic transducer in one embodiment of the present invention;

[0013] Figure 2 for Figure 1 Cross-sectional view;

[0014] Figure 3 A schematic diagram of the voice coil structure in one embodiment of this utility model;

[0015] Figure 4 A schematic diagram of the voice coil structure in another embodiment of this utility model;

[0016] Figure 5 A schematic diagram of the magnetic circuit assembly in one embodiment of this utility model.

[0017] Explanation of icon numbers:

[0018] 100, Support; 200, Magnetic circuit assembly; 210, Base; 220, Central magnet; 221, Magnetic gap; 222, Groove; 2221, Bottom wall; 2222, First inner wall; 2223, Second inner wall; 223, First magnetic guide plate; 230, Side magnet; 231, Protrusion; 2311, Top surface; 2312, First side surface; 2313, Second side surface; 232, Second magnetic guide plate; 300, Voice coil; 310, Connecting part; 311, First connecting segment; 312, Second connecting segment; 313, Third connecting segment; 3131, Recessed space; 314, Fourth connecting segment; 315, Fifth connecting segment; 400, Cover plate; 410, Through hole; 500, Diaphragm; 510, Base membrane; 520, Fascia.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] 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.

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously.

[0023] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0024] In modern electronic devices, electroacoustic transducers are widely used to convert electrical signals into sound signals, such as in loudspeakers, headphones, and electroacoustic musical instruments. During actual production, researchers have found that the voice coils of traditional electroacoustic transducers are mostly rectangular or circular. This limits the effective connection length between the voice coil and the diaphragm, causing the voice coil to vibrate unbalancedly. This leads to malfunctions in the electroacoustic transducer, producing nonlinear distortion and causing the sound to lose its original timbre and texture.

[0025] This invention proposes an electroacoustic transducer to solve the technical problem that electroacoustic transducers are prone to causing sound distortion.

[0026] Please see Figures 1 to 3 In one embodiment of the present invention, the electroacoustic transducer includes a bracket 100, a magnetic circuit assembly 200 and a voice coil 300. The diaphragm 500 is disposed on the bracket 100. The magnetic circuit assembly 200 is provided with a magnetic gap 221. The voice coil 300 includes a plurality of connecting portions 310 that are connected end to end in sequence and surround to form a through hole. Each connecting portion 310 is connected to the diaphragm 500, and at least a portion of each connecting portion 310 passes through the magnetic gap 221. At least one connecting portion 310 includes a first connecting segment 311, a second connecting segment 312, a third connecting segment 313, a fourth connecting segment 314, and a fifth connecting segment 315 connected in sequence. The second connecting segment 312, the third connecting segment 313, and the fourth connecting segment 314 surround and form a recessed space 3131 that is recessed into the voice coil 300. The second connecting segment 312 and the fourth connecting segment 314 are both inclined from the side closer to the third connecting segment 313 to the side farther away from the third connecting segment 313 along the extension direction of the third connecting segment 313.

[0027] The technical solution of this utility model, by recessing a portion of the voice coil 300 inwards, enables the voice coil 300 to vibrate more uniformly and efficiently, reducing sound distortion and improving sound fidelity. In this embodiment, the magnetic circuit assembly 200 is used to generate a magnetic field to drive the voice coil 300 to vibrate. The voice coil 300 is composed of multiple connecting parts 310 connected end to end. At least one connecting part 310 includes a first connecting segment 311, a second connecting segment 312, a third connecting segment 313, a fourth connecting segment 314, and a fifth connecting segment 315 connected in sequence. The second connecting segment 312, the third connecting segment 313, and the fourth connecting segment 314 form a recessed space 3131 that is recessed into the voice coil 300. In other words, the recessed portion of the voice coil 300 increases the effective connection length between the voice coil 300 and the diaphragm 500, making the vibration of the voice coil 300 more uniform and efficient. At the same time, it also allows the driving force provided by the magnetic circuit assembly 200 to be transmitted to the diaphragm 500 more evenly, thereby reducing sound distortion and improving sound fidelity. Furthermore, by tilting the second connecting segment 312 and the fourth connecting segment 314 along the extension direction of the third connecting segment 313 from the side closer to the third connecting segment 313 to the side farther away from the third connecting segment 313, the possibility of deformation of the voice coil 300 due to internal stress concentration can be reduced, ensuring the structural stability of the voice coil 300. This electroacoustic transducer is applied in the field of electronic equipment technology such as loudspeakers and microphones.

[0028] It should be noted that this electroacoustic transducer is a loudspeaker; however, it can also be a microphone. The following explanation uses a loudspeaker as an example: When an audio current is passed through the voice coil 300, that is, when a changing current converted from sound is passed through the voice coil 300, the voice coil 300 generates a magnetic field that changes with the audio current. The magnetic field generated by the voice coil 300 interacts with the magnetic field generated by the magnetic circuit assembly 200, causing the voice coil 300 to vibrate along its thickness direction, which in turn drives the diaphragm 500 to vibrate, causing the air to vibrate. Thus, the audio current passed through the voice coil 300 can be converted into sound.

[0029] The voice coil 300 of this electroacoustic transducer has a single-wire winding structure, meaning it is made from a single voice coil wire. During manufacturing, the voice coil 300 is first wound into a circle or square shape, and then shaped using a special mold. If the included angle between adjacent segments of the connecting portion 310 of the voice coil 300 is shaped into a right angle or an acute angle, it will cause significant stress at the corners. This stress will drive deformation of the voice coil 300, thus altering its structure. Simultaneously, the right-angle structure will complicate the magnetic field coupling of the magnetic circuit assembly 200. The interaction of different magnetic fields will generate additional magnetic field variations, leading to uneven stress on the voice coil 300 and irregular vibration of the diaphragm 500, affecting the accuracy and stability of the sound quality. The electroacoustic transducer, by tilting the second connecting section 312 and the fourth connecting section 314 along the extension direction of the third connecting section 313 from the side closer to the third connecting section 313 to the side farther away from the third connecting section 313, can form a larger angle between adjacent sections of the connecting part 310. Compared with the structure with a small angle, the structure with a large angle will generate less internal stress. Therefore, by adopting the above-mentioned tilting arrangement of the second connecting section 312 and the fourth connecting section 314, the possibility of deformation of the voice coil 300 due to internal stress concentration can be reduced, ensuring the structural stability of the voice coil 300. At the same time, it can also make the force on the voice coil 300 more uniform, thereby improving the accuracy and stability of the sound quality.

[0030] Please see Figure 3 In one embodiment of this utility model, there are two connecting portions 310, which are symmetrically arranged and each has a recessed space 3131. Specifically, the two connecting portions 310 with recessed spaces 3131 are connected end to end to form an I-shaped voice coil 300. This increases the number of inward recesses in the voice coil 300, increases the effective connection length between the voice coil 300 and the diaphragm 500, and makes the vibration of the voice coil 300 more uniform and efficient. In this embodiment, both the first connecting segment 311 and the fifth connecting segment 315 have a bent section perpendicular to the third connecting segment 313, and the two connecting portions 310 are connected end to end through the bent sections of the first connecting segment 311 and the fifth connecting segment 315.

[0031] Please see Figure 3 and Figure 5In one embodiment of this utility model, the magnetic circuit assembly 200 includes a base 210, a central magnet 220, and a plurality of side magnets 230. The base 210 is disposed on the support 100, and the central magnet 220 is disposed on the base 210 and located inside the voice coil 300. The plurality of side magnets 230 are evenly spaced around the central magnet 220 and located outside the voice coil 300, with each side magnet 230 forming a magnetic gap 221 with the central magnet 220. In this embodiment, the side magnets 230 can interact with the central magnet 220 to generate a uniform magnetic field in the magnetic gap 221, through which at least a portion of the voice coil 300 passes. When an audio current is passed through the voice coil 300, the magnetic circuit assembly 200 can drive the voice coil 300 to vibrate along its thickness direction, thereby causing the diaphragm 500 to vibrate and the air to vibrate. Thus, the audio current passing through the voice coil 300 can be converted into sound. In one specific embodiment, the base 210 may be a magnetic cup, a concave iron component used in electromagnetic devices to support and guide magnetic fields, improving the efficiency and uniformity of the magnetic field. Both the central magnet 220 and the side magnets 230 employ high-performance permanent magnets, such as neodymium iron boron permanent magnets, to provide a strong and stable magnetic field.

[0032] Please see Figure 5In one embodiment of this utility model, the central magnet 220 is provided with a groove 222 corresponding to the position of the third connecting segment 313. The second connecting segment 312, the third connecting segment 313, and the fourth connecting segment 314 are all accommodated in the groove 222. The groove 222 is provided with a bottom wall 2221, a first inner wall 2222, and a second inner wall 2223. The bottom wall 2221 is arranged parallel to the third connecting segment 313, the first inner wall 2222 is arranged parallel to the second connecting segment 312, and the second inner wall 2223 is arranged parallel to the fourth connecting segment 314. A protrusion 231 is provided on the side magnet 230 corresponding to the position of the third connecting segment 313, and the protrusion 231 is accommodated in the recessed space 3131. The protrusion 231 is provided with a top surface 2311, a first side surface 2312, and a second side surface 2313. The top surface 2311 is arranged parallel to the third connecting segment 313, the first side surface 2312 is arranged parallel to the second connecting segment 312, and the second side surface 2313 is arranged parallel to the fourth connecting segment 314. In this embodiment, by providing a groove 222 on the central magnet 220 and a protrusion 231 on the side magnet 230, the shape of the magnetic gap 221 formed by the central magnet 220 and the side magnet 230 is the same as the shape of the recessed area of ​​the voice coil 300. This allows the magnetic field generated by the interaction of the central magnet 220 and the side magnet 230 to act more concentratedly on the voice coil 300, optimizing the force on the voice coil 300 in the magnetic field and improving the audio conversion efficiency. It should be noted that, in this embodiment, the grooves 222 are formed on opposite sides of the central magnet 220, and the bottom walls 2221, the first inner wall 2222 and the second inner wall 2223 of the two grooves 222 are respectively located on opposite sides of the central magnet 220. The top surface 2311, the first side surface 2312 and the second side surface 2313 of the protrusion 231 are all located on the side of the protrusion 231 facing the voice coil 300.

[0033] Please see Figure 2 In one embodiment of this invention, a first magnetic guide plate 223 is provided at the end of the central magnet 220 facing away from the base 210, and a second magnetic guide plate 232 is provided at the end of the side magnet 230 facing away from the base 210. Specifically, the magnetic guide plate is used to concentrate and enhance the magnetic field, effectively guiding the magnetic field generated by the interaction between the central magnet 220 and the side magnet 230 into the magnetic gap 221, making the magnetic field strength in the magnetic gap 221 more uniform and stronger, and improving the sensitivity and efficiency of the electroacoustic transducer. Furthermore, the magnetic guide plate can also improve the stability of the voice coil 300; that is, by providing the magnetic guide plate, the voice coil 300 can be ensured to move stably in the magnetic gap 221, avoiding collisions between the voice coil 300 and the magnetic circuit assembly 200 during vibration, maintaining the purity of the sound quality, and reducing distortion. In a specific embodiment, the shape and size of the first magnetic guide plate 223 are the same as those of the central magnet 220, and the shape and size of the second magnetic guide plate 232 are the same as those of the side magnet 230.

[0034] In one embodiment of this utility model, the angle between the second connecting segment 312 and the third connecting segment 313 is defined as α, and the angle between the fourth connecting segment 314 and the third connecting segment 313 is defined as β. Therefore, 115°≤α=β≤155°. In this embodiment, limiting the angles between the second connecting segment 312 and the third connecting segment 313, and between the fourth connecting segment 314 and the third connecting segment 313, to between 115° and 155° increases the effective connection length between the voice coil 300 and the diaphragm 500, making the vibration of the voice coil 300 more uniform and efficient. It also reduces the possibility of deformation of the voice coil 300 due to internal stress concentration, ensuring the structural stability of the voice coil 300.

[0035] Please see Figure 4 In another embodiment of this utility model, there are multiple connecting portions 310 arranged in a ring, and each connecting portion 310 is provided with a recessed space 3131. Specifically, the multiple connecting portions 310 with recessed spaces 3131 are connected end to end to form a near-circular voice coil 300, which can increase the effective connection length between the voice coil 300 and the diaphragm 500, making the vibration of the voice coil 300 more uniform and efficient. In this embodiment, it should be noted that, in order to ensure that the voice coil 300 is subjected to uniform force in the magnetic field, the outer contour of the central magnet 220 and the inner contour of the side magnet 230 need to be consistent with the shape of the voice coil 300; that is, the shape of the magnetic gap 221 formed by the central magnet 220 and the side magnet 230 is consistent with the shape of the voice coil 300. Meanwhile, to simplify the structure of the voice coil 300, two adjacent connecting parts 310 can share the first connecting segment 311 and the fifth connecting segment 315; or, the first connecting segment 311 and the fifth connecting segment 315 of each connecting part 310 can be omitted.

[0036] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the diaphragm 500 includes a base diaphragm 510 and a rib 520 circumferentially arranged around the base diaphragm 510. The base diaphragm 510 and the rib 520 are integrally formed. The base diaphragm 510 is connected to the connecting portion 310, and the rib 520 is recessed from the base diaphragm 510 toward the direction closer to the magnetic circuit assembly 200. In this embodiment, the rib 520 is recessed from the base diaphragm 510 toward the direction closer to the permanent magnet; that is, the diaphragm 500 is provided with a groove, which on the one hand can enhance the rigidity of the diaphragm 500, reduce the deformation and imbalance of the diaphragm 500 during vibration, avoid the segmented vibration caused by the twisting of the diaphragm 500, thereby reducing the harmonic distortion of the speaker and improving the sound quality. On the other hand, it can control the direction of sound propagation and the diffusion range, avoid the reflection and standing waves of sound on the surface of the diaphragm 500, thereby improving the purity of the sound.

[0037] Please see Figure 2In one embodiment of this utility model, the electroacoustic transducer further includes a cover plate 400, which covers the bracket 100 and has a through hole 410 through which a portion of the magnetic circuit assembly 200 passes. In this embodiment, the cover plate 400 cooperates with the bracket 100 to isolate the magnetic circuit assembly 200 and the voice coil 300 from the external environment; it can better protect the magnetic circuit assembly 200 and the voice coil 300 and prevent damage.

[0038] The above are merely exemplary embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the technical concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. An electroacoustic transducing device, characterized by, The electric-acoustic transducing device comprises: a support; a diaphragm arranged on the support; a magnetic circuit assembly provided with a magnetic gap; a voice coil comprising a plurality of connection portions connected in sequence and surrounding a through hole, each of the connection portions is connected with the diaphragm, and at least part of each of the connection portions penetrates the magnetic gap; at least one of the connection portions comprises a first connection segment, a second connection segment, a third connection segment, a fourth connection segment and a fifth connection segment connected in sequence, the second connection segment, the third connection segment and the fourth connection segment surround a recessed space recessed to the inside of the voice coil, and the second connection segment and the fourth connection segment are inclined from the side close to the third connection segment to the side away from the third connection segment along the extension direction of the third connection segment.

2. The electro-acoustic transducer device of claim 1, wherein, The number of the connection portions is two, the two connection portions are symmetrically arranged, and each of the two connection portions is provided with the recessed space; or The number of the connection portions is multiple, the multiple connection portions are arranged in a ring shape, and each of the connection portions is provided with the recessed space.

3. The electro-acoustic transducer device of claim 1, wherein, The magnetic circuit assembly comprises a base, a center magnet and a plurality of side magnets, the base is arranged on the support, the center magnet is arranged on the base and located inside the voice coil, and the plurality of side magnets are uniformly arranged around the center magnet in the circumferential direction and located outside the voice coil, and each of the side magnets surrounds the center magnet to form the magnetic gap.

4. The electro-acoustic transducer device of claim 3, wherein, The center magnet is provided with a groove corresponding to the position of the third connection segment, and the second connection segment, the third connection segment and the fourth connection segment are accommodated in the groove; the groove is provided with a bottom wall, a first inner wall and a second inner wall, the bottom wall is arranged in parallel with the third connection segment, the first inner wall is arranged in parallel with the second connection segment, and the second inner wall is arranged in parallel with the fourth connection segment.

5. The electro-acoustic transducer device of claim 4, wherein, The side magnet is provided with a protrusion corresponding to the position of the third connection segment, and the protrusion is accommodated in the recessed space; the protrusion is provided with a top surface, a first side surface and a second side surface, the top surface is arranged in parallel with the third connection segment, the first side surface is arranged in parallel with the second connection segment, and the second side surface is arranged in parallel with the fourth connection segment.

6. The electro-acoustic transducer device of claim 3, wherein, The end of the center magnet away from the base is provided with a first magnetic guide plate, and the end of the side magnet away from the base is provided with a second magnetic guide plate.

7. The electro-acoustic transducer device of claim 1, wherein, An angle between the second connection segment and the third connection segment is defined as α, and an angle between the fourth connection segment and the third connection segment is defined as β, and 115°≤α=β≤155°.

8. The electro-acoustic transducer device of any one of claims 1-7, wherein, The diaphragm comprises a base film and a muscle film arranged around the base film in the circumferential direction, the base film and the muscle film are integrally formed, the base film is connected with the connection portion, and the muscle film is recessed from the base film to the direction close to the magnetic circuit assembly.

9. The electro-acoustic transducer device of any one of claims 1-7, wherein, The electric-acoustic transducing device further comprises a cover plate arranged on the support, and the cover plate is provided with a through hole, and the magnetic circuit assembly partially penetrates the through hole.

10. The electro-acoustic transducer device of any one of claims 1-7, wherein, The electric-acoustic transducing device comprises a loudspeaker.

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