Loudspeaker and electronic device

Abstract

This invention discloses a loudspeaker and electronic device. A first magnetic component and a second magnetic component are respectively disposed on opposite sides of a central magnetic conductor. The first magnetic component is positioned inside the central magnetic conductor via a first receiving groove to increase the magnetic field strength within the central magnetic conductor, thereby improving the magnetic flux density between the central magnetic conductor and the outer magnetic portion. This avoids the first magnetic component directly applying its magnetic field to the outer magnetic portion, preventing uneven distribution of magnetic lines of force. Furthermore, during the manufacturing process of the central magnetic conductor, controlling the position of the first receiving groove on the central magnetic conductor allows for better control of the relative positions of the first, central, and second magnetic components in the horizontal direction. This further ensures that the width of the magnetic gap is consistent in all directions, resulting in more stable voice coil movement and improved sound quality of the electronic device.

Description

Technical Field

[0001] This invention relates to the field of loudspeaker technology, and more particularly to a loudspeaker and electronic device. Prior Technology

[0002] Loudspeakers convert electrical signals into sound signals. In electrodynamic loudspeakers, the voice coil reciprocates under the influence of the Ampere force in a magnetic field. Therefore, the distribution of the magnetic field within the magnetic gap significantly affects the voice coil's motion. Optimizing the magnetic field distribution within the magnetic gap to improve the stress on the voice coil becomes a problem that needs to be solved. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a loudspeaker and an electronic device, which utilizes a first receiving groove disposed on a central magnetic conductor to cover the side and bottom surfaces of a first magnetic component, thereby increasing the magnetic flux density in the magnetic gap and making the magnetic field distribution more uniform.

[0004] According to a first aspect of the present invention, a loudspeaker is provided, comprising: a voice coil; a housing portion; a diaphragm, wherein the housing portion is fixedly connected to the outer edge of the diaphragm, and the end face of the voice coil is fixedly connected to the inner side of the outer edge of the diaphragm; and an outer magnetic portion and a central magnetic portion, wherein a magnetic gap is formed between the outer magnetic portion and the central magnetic portion, and the voice coil is at least partially located in the magnetic gap; the central magnetic portion includes a central magnetic conductor, a first magnetic conductor, and a second magnetic conductor stacked thereon, the central magnetic conductor being spaced apart between the first magnetic conductor and the second magnetic conductor, the central magnetic conductor including a surrounding body and a central body, the surrounding body extending circumferentially along the central body and forming a first receiving groove with the central body, the first magnetic conductor being mounted in the first receiving groove and the side of the first magnetic conductor corresponding to at least a portion of the inner sidewall of the first receiving groove.

[0005] Furthermore, the loudspeaker also includes: a first receiving groove located in the center of the central magnetic conductor and facing the diaphragm, the first magnetic conductor being a plate-like structure, and a surround covering the edge of the plate-like structure.

[0006] Furthermore, the plate surface of the plate structure is a rounded rectangle; the shape of the first receiving groove is adapted to the rounded rectangle and the depth of the first receiving groove is the same as the thickness of the plate structure.

[0007] Furthermore, there are four outer magnetic parts, each corresponding to a straight side of the rounded rectangle.

[0008] Furthermore, the central body is a central plate, and the side of the central plate facing the second magnetic element is flush with the side of the surrounding body facing the second magnetic element; the surrounding body has an inner wall and an outer wall that are opposite to each other, and the outer wall is aligned with the side of the second magnetic element.

[0009] Furthermore, the cross-section along the extension direction of the surrounding body is a rectangle with unequal side lengths, and the longer side of the rectangle is connected to the central body.

[0010] Furthermore, the outer magnetic part includes a third magnetic element and an outer magnetic conductor stacked together; the surrounding body simultaneously forms a magnetic gap with the regions on the opposite sides of the third magnetic element and the outer magnetic conductor.

[0011] Furthermore, the speaker also includes: a magnetic base plate, four outer magnetic parts and a second magnetic element attached to the same side of the magnetic base plate; a housing part, including multiple mounting platforms and a window, the multiple mounting platforms protruding towards the same side, the magnetic base plate being mounted on the top of the mounting platforms, and the edge of the diaphragm being fixedly connected to the edge of the window.

[0012] Furthermore, there are four mounting platforms, each with an arc-shaped flow guide surface located on the side of the mounting platform and opposite to the central magnetic part; the outer magnetic part has a flow guide slope adjacent to the arc-shaped flow guide surface located on the side of the outer magnetic part, and each flow guide slope extends toward the adjacent arc-shaped flow guide surface.

[0013] Furthermore, the housing includes four fixing plates corresponding to the four outer magnetic parts. The side of each outer magnetic part away from the central magnetic part is fixed to the fixing plate. Each mounting platform is spaced between two adjacent fixing plates and corresponds to the central magnetic part through the gap between two adjacent outer magnetic parts.

[0014] Furthermore, the central body is a central plate, and the surrounding body forms a second receiving groove around the central plate. The orientation of the second receiving groove is opposite to that of the first receiving groove. The second magnetic element is installed in the second receiving groove, and the side of the second magnetic element corresponds to at least a portion of the inner sidewall of the second receiving groove.

[0015] Furthermore, the bottom surface of the second receiving groove is parallel to the bottom surface of the first receiving groove; in the thickness direction of the center plate, the side walls of the first receiving groove and the second receiving groove coincide, and the side walls of the first receiving groove and the side walls of the second receiving groove are both perpendicular to the bottom surface of the first receiving groove; the second magnetic element is a plate-shaped element, and the surrounding body covers the edge of the plate-shaped element.

[0016] Furthermore, the surround body has a mounting end face surrounding the second receiving groove; the speaker also includes: a magnetic base plate, a central magnetic part mounted on the magnetic base plate, and the mounting end face and the second magnetic element simultaneously abutting against the magnetic base plate.

[0017] Furthermore, the depth of the first receiving groove is greater than the depth of the second receiving groove; during the movement of the voice coil, the first magnetic element and the central body remain in correspondence with the voice coil.

[0018] Secondly, embodiments of the present invention also provide an electronic device including: the speaker described in the first aspect.

[0019] The speaker and electronic device of this invention have a first magnetic component and a second magnetic component respectively disposed on both sides of a central magnetic conductor. The first magnetic component is positioned inside the central magnetic conductor via a first receiving groove to increase the magnetic field strength within the central magnetic conductor, thereby improving the magnetic flux density between the central magnetic conductor and the outer magnetic portion. This avoids the first magnetic component directly applying its magnetic field to the outer magnetic portion, preventing uneven distribution of magnetic lines of force. Furthermore, during the manufacturing process of the central magnetic conductor, controlling the position of the first receiving groove on the central magnetic conductor allows for better control of the relative positions of the first, central, and second magnetic components in the horizontal direction. This further ensures consistent magnetic gap width in all directions, resulting in more stable voice coil movement and improved sound quality of the electronic device. Especially when the speaker operates at low frequencies, it significantly reduces total harmonic distortion. Simple Explanation of the Diagram

[0020] Figure 1 is a structural schematic diagram of one side of the speaker according to an embodiment of the present invention; Figure 2 is a structural schematic diagram of the other side of the speaker according to an embodiment of the present invention; Figure 3 is a schematic diagram of the explosion of the loudspeaker according to an embodiment of the present invention; Figure 4 is a cross-sectional schematic diagram of a loudspeaker according to an embodiment of the present invention in some embodiments; Figure 5 is a schematic diagram of the magnetic field line distribution in the magnetic gap according to an embodiment of the present invention; Figure 6 is a cross-sectional schematic diagram of the loudspeaker in some other embodiments of the present invention; Figure 7 is a cross-sectional schematic diagram of the loudspeaker in some further embodiments of the present invention; Figure 8 is a schematic diagram of airflow in a loudspeaker according to an embodiment of the present invention; Figure 9 is a simulation test diagram of the magnetic flux density and displacement change of the voice coil according to an embodiment of the present invention; Figure 10 is a simulation test diagram of the total harmonic distortion of the loudspeaker according to an embodiment of the present invention. Implementation

[0021] The present invention is described below based on embodiments, but the invention is not limited to these embodiments. In the detailed description of the invention below, certain specific details are described in detail. Those skilled in the art will fully understand the invention even without these details. To avoid obscuring the essence of the invention, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0022] Furthermore, those skilled in the art should understand that the drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0023] Unless the context explicitly requires it, words such as "including" or "contains" throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to".

[0024] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0025] For ease of explanation, spatially related terms such as “inside,” “outside,” “below,” “below,” “lower,” “above,” “upper,” etc., are used herein to describe the relationship between one element or feature illustrated in the figure and another. It will be understood that spatially related terms may be intended to encompass different orientations of the device in use or operation besides those depicted in the figure. For example, if the device in the figure is flipped, an element described as “below” or “below” another element or feature would then be positioned “above” that other element or feature. Thus, the exemplified term “below” can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially related descriptive terms used herein should be interpreted accordingly.

[0026] Figures 1 and 2 are schematic diagrams of the speaker structure from different directions. The speaker in the figures is roughly a block structure. The diaphragm 4 and the magnetic base plate 5 are located at the top and bottom of the speaker, respectively, and are fixed by the housing portion 6. A connecting portion 63 is also provided on the housing portion 6, extending to one side of the housing portion 6. This connecting portion 63 facilitates the mounting of the speaker onto electronic devices, including but not limited to mobile phones, watches, or laptops.

[0027] Figure 3 is a schematic diagram of the loudspeaker explosion. The central magnetic part 1 is located in the middle, and four outer magnetic parts 2 are arranged around the central magnetic part 1.

[0028] Figures 4 to 7 are cross-sectional schematic diagrams of the loudspeaker in different embodiments. The arrows in Figures 5 and 7 show the distribution of some magnetic lines of force in the magnetic gap 3.

[0029] As shown in Figures 1 to 3, the loudspeaker of this embodiment includes a voice coil 7, a housing portion 6, a diaphragm 4, and at least one outer magnetic portion 2 and a central magnetic portion 1. The housing portion 6 is fixedly connected to the outer edge of the diaphragm 4, and the end face of the voice coil 7 is fixedly connected to the inner side of the outer edge of the diaphragm 4. Referring again to Figure 4, a magnetic gap 3 is formed between the central magnetic portion 1 and the outer magnetic portion 2, and the voice coil 7 is at least partially located in the magnetic gap 3. The central magnetic part 1 includes a central magnetic conductor 13, a first magnetic conductor 11, and a second magnetic conductor 12 stacked together. The central magnetic conductor 13 is located between the first magnetic conductor 11 and the second magnetic conductor 12. The central magnetic conductor 13 includes a surrounding body 131 and a central body 132. The surrounding body 131 extends circumferentially along the central body 132 and forms a first receiving groove 133 with the central body 132. The first magnetic conductor 11 is installed in the first receiving groove 133 and the side of the first magnetic conductor 11 corresponds to at least a portion of the inner sidewall of the first receiving groove 133, that is, the first magnetic conductor 11 is completely submerged in the first receiving groove 133.

[0030] Specifically, in this embodiment, the magnetic gap 3 can be formed between the central magnetic guide 13 and the outer magnetic part 2, and between the second magnetic member 12 and the outer magnetic part 2. As shown in FIG5, the magnetic flux density formed between the central magnetic guide 13 and the outer magnetic part 2 is more compact, that is, the magnetic field generated by the first magnetic member 11 and the second magnetic member 12 is constrained by the central magnetic part 1 in the near-top region of the magnetic gap 3, so that as many magnetic lines of force as possible pass through the voice coil 7 during the up and down movement of the voice coil 7, so that the Ampere force on the voice coil 7 remains stable during the process. In contrast, the central magnetic part 1 in FIG4 and FIG6 does not have a first receiving groove 133. Compared with the state shown in FIG5, in this state, the magnetic force of the first magnetic member 11 will directly act on the outer magnetic part 2, so the magnetic lines of force in the magnetic gap 3 will become uneven.

[0031] During the machining of the first receiving groove 133 on the central magnetic conductor 13, the central magnetic conductor 13 can be clamped onto a CNC milling machine, and the first receiving groove 133 can be milled on the central magnetic conductor 13 using a milling cutter. This ensures the depth of the first receiving groove 133 and the positional accuracy of the first receiving groove 133 on the central magnetic conductor 13. When the first magnetic component 11 is installed in the first receiving groove 133, the positioning of the first magnetic component 11 can be achieved through the first receiving groove 133, thereby ensuring the relative positional accuracy between the first magnetic component 11 and the central magnetic conductor 13. In other words, compared to the structure in Figure 6 where the first magnetic component 11', the second magnetic component 12', and the central magnetic conductor 13' are stacked sequentially, the assembly accuracy of the central magnetic part 1 can be reduced by using the first receiving groove 133.

[0032] Specifically, the first receiving slot 133 can face the top of the speaker (as shown in Figure 3) or be configured to face the bottom of the speaker. The specific arrangement direction can be selected by those skilled in the art based on actual usage requirements. Figure 9 shows a simulation test diagram of magnetic flux density and displacement changes when the first receiving slot 133 faces top. Curves I and II correspond to the speaker structures in Figures 5 and 6, respectively. The negative range of the horizontal axis represents the movement of the voice coil 7 towards the bottom of the speaker, and the positive range represents the movement of the voice coil 7 towards the top of the speaker. It can be seen from the figure that by utilizing the structure of the first receiving slot 133 of the central magnetic conductor 13, the attenuation rate of the magnetic flux density can be reduced during the movement of the voice coil 7 towards the top, thereby ensuring the sound quality of the speaker. In contrast, Figure 10 shows a simulation test diagram of the total harmonic distortion (THD) of the speaker. Curves I and II also correspond to the speaker structures in Figures 5 and 6, respectively. The frequency of the dashed line in the figure is 400Hz. It can be seen from the figure that when the speaker is operating at low frequencies, the THD of curve I is much lower than that of curve II.

[0033] Optionally, the top of the first magnetic element 11 located within the first receiving groove 133 may be configured to be at the same height as or slightly lower than the top of the first receiving groove 133. This prevents the first magnetic element 11 from directly applying a magnetic field to the outer magnetic part 2.

[0034] In summary, in this embodiment, the loudspeaker has the first magnetic element 11 and the second magnetic element 12 respectively disposed on both sides of the central magnetic conductor 13. Simultaneously, the first magnetic element 11 is positioned inside the central magnetic conductor 13 via the first receiving groove 133 to increase the magnetic field strength within the central magnetic conductor 13, thereby improving the magnetic flux density between the central magnetic conductor 13 and the outer magnetic part 2. This avoids the first magnetic element 11 directly acting on the outer magnetic part 2, preventing uneven distribution of magnetic lines of force. Furthermore, during the manufacturing process of the central magnetic conductor 13, by controlling the position of the first receiving groove 133 on the central magnetic conductor 13, the relative positions of the first magnetic element 11, the central magnetic conductor 13, and the second magnetic element 12 in the horizontal direction can be better controlled, further ensuring that the width of the magnetic gap 3 is consistent in all directions. This makes the voice coil movement more stable and improves the sound quality of the electronic device. Especially when the loudspeaker operates at low frequencies, it can significantly reduce total harmonic distortion.

[0035] In some embodiments, as shown in Figures 2 and 3, the loudspeaker also includes a diaphragm 4. A first receiving groove 133 is located in the center of the central magnetic conductor 13 and faces the diaphragm 4. The first magnetic conductor 11 is a plate-like structure, and the edge of the plate-like structure abuts against the surround 131.

[0036] Specifically, the bottom surface of the plate-like structure is in contact with the bottom of the first receiving groove 133. The plate-like structure fills the entire first receiving groove 133, so that the first magnetic element 11 is stably connected to the central magnetic conductor 13, while increasing the volume of the first magnetic element 11 to enhance the magnetic field generated by the first magnetic element 11.

[0037] In some embodiments, as shown in Figures 4 and 5, the plate surface of the plate-like structure is a rounded rectangle. Correspondingly, the shape of the first receiving groove 133 is adapted to the rounded rectangle, and the depth of the first receiving groove 133 is the same as the thickness of the plate-like structure. In this embodiment, the horizontal cross-section of the first receiving groove 133 is also set to a rounded rectangle. Using a milling cutter with the same radius as the rounded corner, it is convenient to cut the rounded corner.

[0038] Furthermore, there are four outer magnetic parts 2, each corresponding to a straight side of the rounded rectangle. In this embodiment, by symmetrically arranging four outer magnetic parts 2 around the central magnetic part 1, it is ensured that the Ampere force on the voice coil 7 is located in the height direction of the speaker.

[0039] In some embodiments, as shown in FIG4, the central body 132 is a central plate, and the side of the central plate facing the second magnetic element 12 is flush with the side of the surrounding body 131 facing the second magnetic element 12. That is, the bottom of the surrounding body 131 is flush with the bottom of the central body 132, so that the central magnetic conductor 13 can be mounted on the top surface of the second magnetic element 12 through this plane. At the same time, the surrounding body 131 has an inner wall 1311 and an outer wall 1312 that are opposite to each other, and the outer wall 1312 is aligned with the side of the second magnetic element 12. Thus, the central magnetic conductor 13 and the second magnetic element 12 together form a sidewall of the magnetic gap 3, so that the voice coil 7 can move up and down along the magnetic gap 3, avoiding collision between the voice coil 7 and the central magnetic part 1.

[0040] In some embodiments, as shown in Figure 4, the cross-section of the surrounding body 131 extending in the direction of extension is a rectangle with adjacent sides of unequal length. The long side of the rectangle is connected to the central body 132, that is, the short side of the rectangle extends towards the magnetic gap 3. The enlarged view in Figure 4 shows a specific form of the surrounding body 131. The outlines of the surrounding body 131 and the central body 132 in the figure are shown by thick solid lines. The surrounding body 131 in the figure extends along the height direction of the magnetic gap 3 so that the voice coil 7 can always be in the magnetic field during reciprocating motion.

[0041] In some embodiments, as shown in Figures 4 and 5, the outer magnetic part 2 includes a third magnetic element 21 and an outer magnetic conductor 22 stacked together. The surrounding body 131 simultaneously forms a magnetic gap 3 with the regions opposite to the third magnetic element 21 and the outer magnetic conductor 22. Figure 5 shows a schematic diagram of the magnetic lines of force in the magnetic gap 3, which are divided into three parts. The magnetic lines of force at the top of the magnetic gap 3 are acted upon by the central magnetic conductor 13 on the outer magnetic conductor 22; the magnetic lines of force in the middle of the magnetic gap 3 are acted upon by the central magnetic conductor 13 on the third magnetic element 21; the magnetic lines of force in the above two parts are relatively evenly distributed, while the magnetic lines of force at the bottom of the magnetic gap 3 are relatively fewer. Therefore, during the up-and-down movement of the voice coil 7, most of the magnetic field can stably pass through the voice coil 7. This reduces the occurrence of speaker distortion.

[0042] In some embodiments, as shown in FIG4, the loudspeaker further includes a magnetic base plate 5 and a housing portion 6. Four outer magnetic portions 2 and a second magnetic element 12 are attached to the same side of the magnetic base plate 5. In this embodiment, the magnetic base plate 5 can provide mounting positions for the central magnetic portion 1 and the outer magnetic portions 2, and can also form a magnetic circuit system together with the central magnetic portion 1 and the outer magnetic portions 2.

[0043] In some embodiments, as shown in Figures 1 to 3, the loudspeaker further includes a diaphragm 4 and a housing portion 6. The housing portion 6 includes a plurality of mounting platforms 61 and a window 62. The plurality of mounting platforms 61 protrude toward the same side, a magnetic base plate 5 is mounted on the top of the mounting platforms 61, and the edge of the diaphragm 4 is fixedly connected to the edge of the window 62.

[0044] Specifically, there are four mounting platforms 61, located at the four corners of the magnetic base plate 5. Referring again to Figure 1, a mounting recess 611 is provided on the top of the mounting platform 61 near the center of the speaker. This mounting recess 611 is formed by the top of the mounting platform 61 recessing towards the bottom of the mounting platform 61. In this embodiment, the mounting platforms 61 can separate the magnetic base plate 5 and the diaphragm 4 in the height direction of the speaker, and the mounting recesses 611 can be used to hold the magnetic base plate 5 between the four mounting platforms 61, thereby providing sufficient space for arranging the central magnetic part 1 and the outer magnetic part 2.

[0045] Figure 8 is a schematic diagram of airflow in the loudspeaker. In some embodiments, as shown in Figure 8, there are four mounting platforms 61, each with an arc-shaped airflow guide surface 612 located laterally and opposite to the central magnetic part 1. The outer magnetic part 2 has a guide slope 23 adjacent to the arc-shaped airflow guide surface 612, located laterally to the outer magnetic part 2, and each guide slope 23 extends toward the adjacent arc-shaped airflow guide surface 612.

[0046] Specifically, as shown in Figure 8, dashed line III and four arrows are also depicted. As shown by dashed line III, the edge of the flow-guiding slope 23 corresponds to the arc-shaped flow-guiding surface 612. The outlines of the arc-shaped flow-guiding surface 612 and the flow-guiding slope 23 are also shown in the figure with thick solid lines. The flow-guiding slope 23 is simultaneously disposed on the third magnetic component 21 and the outer magnetic component 22.

[0047] When the speaker vibrates, the voice coil 7 is subjected to an Ampere force, which causes the diaphragm 4 to move up and down. This causes a change in the internal volume of the speaker. To avoid affecting the movement of the diaphragm 4 during this process, this embodiment uses the guide slope 23 and the arc-shaped guide surface 612 to guide the airflow inside the speaker.

[0048] Taking the movement of the voice coil 7 towards the magnetic base plate 5 as an example, the voice coil 7 drives the diaphragm 4 during its movement, causing the volume inside the speaker to decrease, as shown by the arrow in the figure. During this process, the airflow will reach the arc-shaped guide surface 612 along the guide slope 23, and then be discharged to the outside of the speaker via the arc-shaped guide surface 612. This avoids the impact on the movement of the diaphragm 4 due to the inability of air to be discharged in time. On the other hand, as the air flows out, the heat generated by the speaker can also be discharged together.

[0049] In some embodiments, as shown in FIG8, the housing portion 6 includes four fixing plates 64 corresponding one-to-one with the four outer magnetic portions 2. The side of each outer magnetic portion 2 facing away from the central magnetic portion 1 is fixed to the fixing plate 64. Each mounting platform 61 is spaced apart between adjacent fixing plates 64 and corresponds to the central magnetic portion 1 through the gap between adjacent outer magnetic portions 2. This embodiment utilizes the gap between the mounting platform 61 and the fixing plate 64 to conduct the gas within the magnetic gap 3 to the outside of the speaker, thereby allowing air to continuously flow in and out of the speaker during vibration. This reduces speaker distortion and overheating.

[0050] In some embodiments, as shown in FIG7, the central body 132 is a central plate, and the surrounding body 131 forms a second receiving groove 134 around the central plate. The orientation of the second receiving groove 134 is opposite to that of the first receiving groove 133. The second magnetic element 12 is installed in the second receiving groove 134, and the side of the second magnetic element 12 corresponds to at least a portion of the inner sidewall of the second receiving groove 134.

[0051] This embodiment can simultaneously prevent the first magnetic element 11 and the second magnetic element 12 from directly applying the magnetic field to the outer magnetic part 2. As can be seen from Figure 7, in the height direction of the magnetic gap 3, in addition to the magnetic lines of force located at the top and middle being evenly distributed, the magnetic lines of force located at the bottom of the magnetic gap 3 are also relatively evenly distributed. Figures 5 and 7 also show the approximate cross-sectional outline of the voice coil 7 with dotted lines. By comparing the two figures, it can be seen that this embodiment can further make the magnetic field distribution acting on the voice coil 7 more uniform. This allows the magnetic lines of force located at the bottom region of the central magnetic part 1 in Figure 5, which are in a curled state, to move towards the top of the magnetic gap 3 through the sequential guidance of the central body 132 and the surrounding body 131. Thus, the magnetic field passing through the voice coil 7 is more uniform, thereby reducing the distortion of the loudspeaker. It also improves the Ampere force when the voice coil 7 moves towards the guide magnetic base plate 5.

[0052] In some embodiments, as shown in FIG7, the bottom surface of the second receiving groove 134 is parallel to the bottom surface of the first receiving groove 133. Simultaneously, in the thickness direction of the central plate, the sidewalls of the first receiving groove 133 and the second receiving groove 134 coincide, and both the sidewalls of the first receiving groove 133 and the sidewalls of the second receiving groove 134 are perpendicular to the bottom surface of the first receiving groove 133. The second magnetic element 12 is a plate-shaped element, and the surrounding body 131 covers the edge of the plate-shaped element. In other words, in this embodiment, the horizontal cross-section of the first receiving groove 133 and the horizontal cross-section of the second receiving groove 134 are configured to be the same and coincident. Therefore, in the height direction of the magnetic gap 3, the magnetic field acting on the outer magnetic part 2 after passing through the central magnetic guide 13 will be more uniform.

[0053] In some embodiments, as shown in FIG7, the surround 131 has a mounting end face 1313 surrounding the second receiving groove 134. The speaker also includes a magnetic base plate 5, with the central magnetic part 1 mounted on the magnetic base plate 5. The mounting end face 1313 and the second magnetic element 12 are simultaneously in contact with the magnetic base plate 5. In this embodiment, the second magnetic element 12 can be stably held in place by the cooperation of the central magnetic element 13 and the magnetic base plate 5, preventing the second magnetic element 12 from shaking during speaker use. At the same time, it can also ensure that the magnetic field formed by the second magnetic element 12 and the third magnetic element 21 through the magnetic base plate 5 is more stable.

[0054] In some embodiments, as shown in FIG7, the depth of the first receiving groove 133 is configured to be greater than the depth of the second receiving groove 134. L1 and L2 shown in the figure represent the depths of the first receiving groove 133 and the second receiving groove 134, respectively; that is, L1 is greater than L2. Conversely, the thickness of the first magnetic element 11 is greater than the thickness of the second magnetic element 12, so as to move the magnetic lines of force in the magnetic gap 3 upwards as much as possible. During the movement of the voice coil 7, the first magnetic element 11 and the central body 132 remain aligned with the voice coil 7. This further reduces speaker distortion.

[0055] In an alternative implementation, the speaker in the above embodiments can be applied to an electronic device.

[0056] In this embodiment of the electronic device, the first magnetic element 11 and the second magnetic element 12 of the speaker are respectively disposed on both sides of the central magnetic guide 13. Simultaneously, the first magnetic element 11 is positioned inside the central magnetic guide 13 via the first receiving groove 133 to increase the magnetic field strength within the central magnetic guide 13, thereby improving the magnetic flux density between the central magnetic guide 13 and the outer magnetic part 2. This avoids the first magnetic element 11 directly acting on the outer magnetic part 2, preventing uneven distribution of magnetic lines of force. Furthermore, during the manufacturing process of the central magnetic guide 13, by controlling the position of the first receiving groove 133 on the central magnetic guide 13, the relative positions of the first magnetic element 11, the central magnetic guide 13, and the second magnetic element 12 in the horizontal direction can be better controlled, further ensuring that the width of the magnetic gap 3 is consistent in all directions. This makes the voice coil movement more stable and improves the sound quality of the electronic device. Especially when the speaker operates at low frequencies, it can significantly reduce total harmonic distortion.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can be modified and varied in various ways. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of protection of the present invention.

[0058] 1: Central magnetic section 11, 11´: First magnetic component 12, 12´: Second magnetic component 13, 13´: Central magnetic conductor 131: Surrounding Body 1311: Inner wall 1312:Outer wall 1313: Mounting end face 132: Central body 133: First receiving slot 134: Second receiving slot 2: Outer magnetic part 21: Third magnetic component 22: External magnetic conductor 23: Guide slope 3: Magnetic gap 4: Diaphragm 5: Magnetic base plate 6: Shell section 61: Installation stand 611: Installation dent 612: Arc-shaped guide surface 62: Window 63: Connecting part 64: Fixing plate 7: Voice coil

Claims

1. A loudspeaker comprising: a voice coil (7); a housing portion (6) having a connecting portion (63) extending toward one side of the housing portion (6); a diaphragm (4) and a magnetic base plate (5), the diaphragm (4) and the magnetic base plate (5) being fixed to the top and bottom of the housing portion (6) respectively, the end face of the voice coil (7) being fixedly connected to the inner side of the outer edge of the diaphragm (4); and an outer magnetic portion (2) and a central magnetic portion (1) attached to the same side of the magnetic base plate (5), a magnetic gap (3) being formed between the outer magnetic portion (2) and the central magnetic portion (1), the voice coil (7) being at least partially located in the magnetic gap (3), and the magnetic base plate (5) forming a magnetic circuit system together with the central magnetic portion (1) and the outer magnetic portion (2); The central magnetic part (1) includes a central magnetic conductor (13), a first magnetic conductor (11), and a second magnetic conductor (12) stacked together. The central magnetic conductor (13) is spaced between the first magnetic conductor (11) and the second magnetic conductor (12). The central magnetic conductor (13) includes a surrounding body (131) and a central body (132). The surrounding body (131) extends circumferentially along the central body (132) and forms a first receiving groove (133) with the central body (132). The first magnetic conductor (11) is installed in the first receiving groove (133) and the side of the first magnetic conductor (11) corresponds to at least a portion of the inner sidewall of the first receiving groove (133).

2. The loudspeaker as claimed in claim 1, wherein, The first receiving groove (133) is located in the center of the central magnetic conductor (13) and faces the diaphragm (4). The first magnetic component (11) is a plate-shaped structure, and the surrounding body (131) covers the edge of the plate-shaped structure.

3. The loudspeaker as claimed in claim 2, wherein, The plate-like structure has a rounded rectangle surface; the shape of the first receiving groove (133) is adapted to the rounded rectangle and the depth of the first receiving groove (133) is the same as the thickness of the plate-like structure.

4. The loudspeaker as claimed in claim 3, wherein, The number of the outer magnetic parts (2) is 4, and each corresponds to a straight side of the rounded rectangle.

5. The loudspeaker as claimed in claim 2, wherein, The central body (132) is a central plate, and the side of the central plate facing the second magnetic element (12) is flush with the side of the surrounding body (131) facing the second magnetic element (12); the surrounding body (131) has an inner wall (1311) and an outer wall (1312) that are opposite to each other, and the outer wall (1312) is aligned with the side of the second magnetic element (12).

6. The loudspeaker as claimed in any one of claims 1 to 5, wherein, The cross-section of the surrounding body (131) extending in the direction of extension is a rectangle with unequal side lengths, and the long side of the rectangle is connected to the central body (132).

7. The loudspeaker as claimed in any one of claims 1 to 5, wherein, The outer magnetic part (2) includes a third magnetic element (21) and an outer magnetic conductor (22) stacked together; the surrounding body (131) forms the magnetic gap (3) with the regions on the opposite sides of the third magnetic element (21) and the outer magnetic conductor (22).

8. The loudspeaker as claimed in claim 4, further comprising: A magnetic base plate (5) is attached to the same side of the magnetic base plate (5), and the four outer magnetic parts (2) and the second magnetic element (12) are attached to the same side of the magnetic base plate (5); the housing part (6) includes a plurality of mounting platforms (61) and a window (62), the plurality of mounting platforms (61) protrude toward the same side, the magnetic base plate (5) is mounted on the top of the mounting platform (61), and the edge of the diaphragm (4) is fixedly connected to the edge of the window (62).

9. The loudspeaker as claimed in claim 8, wherein, The plurality of mounting platforms (61) are four mounting platforms (61), each mounting platform (61) is provided with an arc-shaped flow guide surface (612), the arc-shaped flow guide surface (612) is located on the side of the mounting platform (61) and is opposite to the central magnetic part (1); the outer magnetic part (2) is provided with a flow guide slope (23) adjacent to the arc-shaped flow guide surface (612), the flow guide slope (23) is located on the side of the outer magnetic part (2), and each flow guide slope (23) extends toward the adjacent arc-shaped flow guide surface (612).

10. The loudspeaker as claimed in claim 9, wherein, The housing part (6) includes four fixing plates (64) corresponding one-to-one with the four outer magnetic parts (2). The side of each outer magnetic part (2) away from the central magnetic part (1) is fixed to each fixing plate (64). Each mounting platform (61) is spaced between two adjacent fixing plates (64) and corresponds to the central magnetic part (1) through the gap between two adjacent outer magnetic parts (2).

11. The loudspeaker as claimed in claim 2, wherein, The central body (132) is a central plate, and the surrounding body (131) forms a second receiving groove (134) around the central plate. The orientation of the second receiving groove (134) is opposite to that of the first receiving groove (133). The second magnetic element (12) is installed in the second receiving groove (134) and the side of the second magnetic element (12) corresponds to at least a portion of the inner sidewall of the second receiving groove (134).

12. The loudspeaker as claimed in claim 11, wherein, The bottom surface of the second receiving groove (134) is parallel to the bottom surface of the first receiving groove (133); in the thickness direction of the central plate, the sidewalls of the first receiving groove (133) and the second receiving groove (134) coincide, and the sidewalls of the first receiving groove (133) and the sidewalls of the second receiving groove (134) are perpendicular to the bottom surface of the first receiving groove (133); the second magnetic element (12) is a plate-shaped element, and the surrounding body (131) covers the edge of the plate-shaped element.

13. The loudspeaker as claimed in claim 11, wherein, The surround (131) has a mounting end face (1313) surrounding the second receiving groove (134); the speaker further includes: a magnetic base plate (5), the central magnetic part (1) is mounted on the magnetic base plate (5), and the mounting end face (1313) and the second magnetic element (12) are simultaneously attached to the magnetic base plate (5).

14. The loudspeaker as claimed in claim 11, wherein, The depth of the first receiving groove (133) is greater than the depth of the second receiving groove (134); during the movement of the voice coil (7), the first magnetic element (11) and the central body (132) remain in correspondence with the voice coil (7).

15. An electronic device comprising: a speaker as described in any one of claims 1 to 14.

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