Sound production device and terminal device

Abstract

The application discloses a sound production device and a terminal device, the sound production device comprising a magnetic circuit system and a vibration system, the magnetic circuit system comprising a U-shaped iron and a magnetic circuit part, the U-shaped iron having a receiving groove, the magnetic circuit part comprising a main magnet and a Huasi which are stacked in the receiving groove, the main magnet being clamped between the bottom of the receiving groove and the Huasi, the main magnet and the Huasi being spaced from the side of the receiving groove to form a magnetic gap, the Huasi being provided with a concave cavity, the cross-sectional area of the concave cavity gradually increasing and then decreasing from the side close to the main magnet to the side away from the main magnet, the vibration system comprising a diaphragm and a voice coil connected to the diaphragm, the diaphragm being opposite to the magnetic circuit system, and the end of the voice coil away from the diaphragm being suspended in the magnetic gap. The application aims to provide a sound production device which reduces the weight of the magnetic circuit and improves the magnetic flux of the magnetic gap, and the sound production device has better performance in the BL linear range and the inductance linear range under the condition of a large signal, reduces distortion, and improves sound quality.

Description

Technical Field

[0001] This invention relates to the field of electroacoustic conversion technology, and in particular to a sound-generating device and a terminal device using the sound-generating device. Background Technology

[0002] A loudspeaker, also known as a megaphone, is an electroacoustic transducer that converts electrical energy into sound energy through a physical effect. When different amounts of electron energy are transmitted to the voice coil of the loudspeaker, the voice coil generates energy that interacts with the magnetic field of the magnet. This interaction causes the diaphragm to vibrate. Because the electron energy changes constantly, the voice coil of the loudspeaker moves forward or backward, and thus the diaphragm of the loudspeaker moves accordingly. This movement causes changes in the density of the air, thereby producing sound.

[0003] In related technologies, the magnetic circuit structure of loudspeakers is mostly a simple and regular shape. For example, washers are often cylindrical or toroidal. In washers of this shape, some areas have very low permeability. If the low-permeability areas are retained while further improving loudspeaker performance is desired, the product's weight will be sacrificed, failing to meet the requirements for lightweight design. Simultaneously, the relative position of the voice coil within the magnetic gap varies considerably. Conventional magnetic circuit structures struggle to provide a uniform magnetic field, resulting in nonlinear distortion and affecting the overall sound quality of the loudspeaker. Summary of the Invention

[0004] The main objective of this invention is to provide a sound-generating device and a terminal device, which aims to provide a sound-generating device that reduces the weight of the magnetic circuit and increases the magnetic flux of the magnetic gap. This sound-generating device has better performance in the linear range of BL and the linear range of inductance under large signal conditions, reduces distortion, and improves sound quality.

[0005] To achieve the above objectives, the present invention provides a sound-generating device, the sound-generating device comprising:

[0006] A magnetic circuit system comprising a U-shaped iron and a magnetic circuit portion, wherein the U-shaped iron has a receiving groove, and the magnetic circuit portion includes a main magnet and a washer stacked within the receiving groove, the main magnet being sandwiched between the bottom of the receiving groove and the washer, the main magnet and the washer being spaced from the sides of the receiving groove to form a magnetic gap, and the washer having a cavity, the cross-sectional area of ​​the cavity gradually increasing and then decreasing from the side adjacent to the main magnet to the side away from the main magnet; and

[0007] A vibration system comprising a diaphragm and a voice coil connected to the diaphragm, the diaphragm being opposite to the magnetic circuit system, and the end of the voice coil furthest from the diaphragm being suspended within the magnetic gap.

[0008] In one embodiment, the washer includes a main body and a support. The main body has a recessed groove. The support is connected to the main body and covers the opening of the recessed groove. The support has an opening that communicates with the recessed groove. The opening and the recessed groove together form the cavity.

[0009] In one embodiment, the support portion is formed by bending and extending the end of the main body portion adjacent to the opening of the recessed groove toward the center of the opening of the recessed groove, so that the support portion and the main body portion are integrally formed structures;

[0010] Alternatively, the main body portion may have a stepped portion formed at the end of the groove adjacent to the recessed groove, the support portion may be supported on the stepped portion, and the support portion may be riveted to the main body portion so that the end of the support portion is flush with the end of the main body portion.

[0011] In one embodiment, the thickness of the washer along the vibration direction of the voice coil is defined as H, where 28mm ≤ H ≤ 32mm;

[0012] And / or, define the length of the washer along the direction perpendicular to the vibration direction of the voice coil as D, 70mm≤D≤74mm;

[0013] And / or, the inner wall surface of the recessed groove is an arc-shaped surface, and the cross-sectional area of ​​the recessed groove gradually increases from the side adjacent to the main magnet to the side adjacent to the support.

[0014] In one embodiment, the thickness of the support gradually increases from the opening to the periphery of the support;

[0015] And / or, the angle formed between the side of the support portion facing away from the main body and the side of the support portion facing the recessed groove is greater than or equal to 4°.

[0016] In one embodiment, the U-shaped iron includes a bottom and a side portion connected to the periphery of the bottom, the side portion and the bottom enclosing the receiving groove, and the distance from the end of the side portion away from the bottom to the bottom is greater than or equal to the distance from the side of the washer facing away from the main magnet to the bottom.

[0017] In one embodiment, the side portion and the bottom portion are integrally formed.

[0018] Alternatively, the side is provided with a connecting platform, and the bottom is provided with an abutment platform, which is riveted to the connecting platform.

[0019] In one embodiment, the side portion includes a first segment and a second segment connected together, the end of the second segment away from the first segment being connected to the bottom, the thickness of the first segment being defined as d1, and the thickness of the second segment being defined as d2.

[0020] 0.8≤d1 / d2≤0.9; or, d1=d2.

[0021] In one embodiment, the magnetic circuit portion further includes an aluminum ring, which is sleeved on the outer periphery of the main magnet and the washer.

[0022] In one embodiment, a support protrusion is formed at the bottom of the receiving groove, and the aluminum ring is supported on the support protrusion;

[0023] And / or, the aluminum ring is bonded to the outer periphery of the main magnet and the washer.

[0024] In one embodiment, a support surface is formed on the side of the washer facing away from the main magnet, and the magnetic circuit portion further includes a secondary magnet, which is stacked on the support surface.

[0025] In one embodiment, the bottom of the receiving groove protrudes into the receiving groove to form a support platform, the support platform and the side of the receiving groove are spaced apart to form a clearance groove, the clearance groove is correspondingly connected to the magnetic gap, and the main magnet is supported on the support platform.

[0026] In one embodiment, the main magnet includes a first magnet and a second magnet, which are stacked and sandwiched between the support platform and the washer.

[0027] And / or, the side of the U-shaped iron facing away from the bottom wall of the receiving groove is recessed to form a groove corresponding to the support platform;

[0028] And / or, the support platform is provided with a first through hole, and the magnetic circuit part is provided with a second through hole corresponding to the first through hole, the second through hole sequentially passing through the main magnet and the washer;

[0029] And / or, the sound-generating device further includes a basin frame, the outer wall of the U-shaped iron is provided with a connecting boss, the connecting boss is connected to one end of the basin frame, the diaphragm is connected to the other end of the basin frame and is opposite to the magnetic circuit system.

[0030] The present invention also proposes a terminal device, including a device housing and the aforementioned sound-generating device, wherein the sound-generating device is disposed in the device housing.

[0031] The sound-generating device of this invention consists of a U-shaped iron and a magnetic circuit section. The magnetic circuit section is fixed in place by a slot in the U-shaped iron, while a magnetic gap is formed between the magnetic circuit section and the sidewall of the slot, allowing the voice coil of the vibration system to be suspended. When the voice coil is energized, it moves within the magnetic gap, cutting magnetic field lines, thereby causing the diaphragm to vibrate and produce sound. The magnetic circuit section includes a main magnet and a washer stacked within the slot, with a cavity in the washer. The cross-sectional area of ​​the cavity gradually increases and then decreases from the side adjacent to the main magnet to the side furthest from it. This eliminates the low permeability portion of the washer in the magnetic circuit section, reducing its weight, and fully utilizes the high permeability portion of the washer. This ensures good BL (Blank Linearity) and linear range for the sound-generating device while meeting the requirements of miniaturization and lightweight design. This sound-generating device not only reduces the weight of the magnetic circuit and increases the magnetic flux of the magnetic gap, but also exhibits better performance in BL and inductance linear ranges under large signal conditions, reducing distortion and improving sound quality. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0033] Figure 1 This is a partial cross-sectional schematic diagram of a sound-generating device in one embodiment of the present invention;

[0034] Figure 2 This is a partial cross-sectional schematic diagram of the sound-generating device in another embodiment of the present invention;

[0035] Figure 3 This is a diagram showing the distribution of magnetic field lines as the voice coil of the sound-generating device shifts upward in one embodiment of the present invention;

[0036] Figure 4 This is a diagram showing the magnetic field lines distribution of the voice coil of the sound-generating device in one embodiment of the present invention.

[0037] Figure 5 This is a simulated BL curve of the sound-generating device in one embodiment of the present invention.

[0038] Explanation of icon numbers:

[0039] 100 Sound-generating device 1211 First magnet 1 Magnetic circuit system 1212 Second magnet 11 U-Iron 122 Wasi 112 bottom 1221 cavity 1121 Arrival Platform 1222 Main body 1122 Support protrusion 1223 groove 1123 support platform 1224 Steps 1124 groove 1225 Support section 1125 First through hole 1226 Opening 113 Side 123 aluminum ring 1131 First paragraph 124 secondary magnet 1132 Second paragraph 13 Magnetic gap 1133 Connector 14 Avoidance slot 1134 Connecting boss 15 Second through hole 12 Magnetic circuit section 2 Voice coil 121 Main magnet

[0040] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention 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 indication will also change accordingly.

[0043] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0044] Furthermore, in this invention, descriptions involving "first," "second," etc., 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 that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0045] A loudspeaker, also known as a megaphone, is an electroacoustic transducer that converts electrical energy into sound energy through a physical effect. When different amounts of electron energy are transmitted to the voice coil of the loudspeaker, the voice coil generates energy that interacts with the magnetic field of the magnet. This interaction causes the diaphragm to vibrate. Because the electron energy changes constantly, the voice coil of the loudspeaker moves forward or backward, and thus the diaphragm of the loudspeaker moves accordingly. This movement causes changes in the density of the air, thereby producing sound.

[0046] In related technologies, the magnetic circuit structure of loudspeakers is mostly a simple and regular shape. For example, washers are often cylindrical or toroidal. In washers of this shape, some areas have very low permeability. If the low-permeability areas are retained while further improving loudspeaker performance is desired, the product's weight will be sacrificed, failing to meet the requirements for lightweight design. Simultaneously, the relative position of the voice coil within the magnetic gap varies considerably. Conventional magnetic circuit structures struggle to provide a uniform magnetic field, resulting in nonlinear distortion and affecting the overall sound quality of the loudspeaker.

[0047] Based on the above concepts and problems, the present invention proposes a sound-generating device 100. It is understood that the sound-generating device 100 is applied to a terminal device, which may be headphones, speakers, car speakers, etc., and is not limited thereto.

[0048] Please refer to the reference. Figures 1 to 2 As shown, in this embodiment of the invention, the sound-generating device 100 includes a magnetic circuit system 1 and a vibration system. The magnetic circuit system 1 includes a U-shaped iron 11 and a magnetic circuit portion 12. The U-shaped iron 11 has a receiving groove. The magnetic circuit portion 12 includes a main magnet 121 and a washer 122 stacked in the receiving groove. The main magnet 121 is sandwiched between the bottom 112 of the receiving groove and the washer 122. The main magnet 121 and the washer 122 are spaced apart from the side 113 of the receiving groove to form a magnetic gap 13. The washer 122 has a cavity 1221. The cross-sectional area of ​​the cavity 1221 gradually increases and then decreases from the side adjacent to the main magnet 121 to the side away from the main magnet 121. The vibration system includes a diaphragm and a voice coil 2 connected to the diaphragm. The diaphragm is opposite to the magnetic circuit system 1. The end of the voice coil 2 away from the diaphragm is suspended in the magnetic gap 13.

[0049] In this embodiment, the magnetic circuit system 1 includes a U-shaped iron 11 and a magnetic circuit portion 12. The U-shaped iron 11 has a receiving groove with one open end. The opening of the receiving groove of the U-shaped iron 11 is opposite to the diaphragm. The magnetic circuit portion 12 is disposed in the receiving groove and is spaced apart from the side wall of the receiving groove to form a magnetic gap 13. One end of the voice coil 2 in the vibration system is connected to the diaphragm, and the other end of the voice coil 2 is suspended in the magnetic gap 13. When the voice coil 2 is energized, the voice coil 2 introduces electrical energy into the magnetic gap 13 of the magnetic circuit system 1. Under the action of the magnetic field of the magnetic circuit system 1, the voice coil 2 is driven to cut magnetic field lines, thus converting electrical energy into mechanical energy. When the voice coil 2 moves, it drives the diaphragm to vibrate, thereby causing the diaphragm to vibrate and produce sound. In this way, mechanical energy is converted into sound energy, realizing electroacoustic conversion.

[0050] To further improve the installation stability of the magnetic circuit system 1 and the vibration system, in one embodiment, the sound-generating device 100 further includes a frame with a cavity. The magnetic circuit system 1 is disposed within the cavity, and the diaphragm is connected to the frame and opposite to the magnetic circuit system 1. Of course, in other embodiments, the frame can also be configured as a cavity with openings at both ends. In this case, the U-shaped iron 11 of the magnetic circuit system 1 is connected to one opening of the frame, and the diaphragm is connected to the other opening of the frame. This is not limited here.

[0051] Understandably, the basin frame is used to install, fix, support, and protect components such as the vibration system and magnetic circuit system 1; that is, the basin frame provides a mounting base for components such as the vibration system and magnetic circuit system 1. Understandably, the basin frame can be a mounting shell, housing, or box structure with a cavity; that is, the basin frame defines the receiving space, but this is not limited here.

[0052] Optionally, the basin frame can be cylindrical, square, or flared. The cavity of the basin frame can be an open-end cavity or an open-end cavity. In this embodiment, the basin frame is a cylindrical or basin-shaped structure with one open end. The magnetic circuit system 1 is disposed within the cavity of the basin frame. By connecting and fixing the periphery of the diaphragm of the vibration system to one end of the basin frame and covering the opening, the diaphragm and the magnetic circuit system 1 are opposite to each other, thereby enclosing and forming the vibration space of the sound-generating device 100.

[0053] In this embodiment, the U-shaped iron 11 of the magnetic circuit system 1 is disposed within the cavity of the basin frame, with the opening of the receiving groove facing the diaphragm. It is understood that when the basin frame is made of metal, the magnetic circuit system 1 is fixed to the basin frame by bonding or welding, thereby improving the heat dissipation effect of the sound-generating device 100. In another embodiment, when the basin frame is made of plastic injection molding, the U-shaped iron 11 of the magnetic circuit system 1 can also be injection molded into the basin frame as an insert, or the magnetic circuit system 1 can be fixed to the basin frame by bonding, and then other parts can be bonded together; this is not limited here.

[0054] In this embodiment, as Figure 1 and Figure 2 As shown, the magnetic circuit section 12 includes a main magnet 121 and a washer 122 stacked together. The main magnet 121 can be a magnet, and the washer 122 can be a magnetic plate structure. By providing a cavity 1221 on the washer 122, and making the cross-sectional area of ​​the cavity 1221 of the washer 122 gradually increase and then decrease from the side adjacent to the main magnet 121 to the side away from the main magnet 121, the part of the washer 122 with low permeability is eliminated, thereby reducing the weight of the magnetic circuit section 12, and making full use of the part of the washer 122 with high permeability. This ensures that the sound generating device 100 has a good BL value and linear range, while also meeting the design requirements of miniaturization and lightweight.

[0055] Understandably, the main magnet 121 can be a plate-shaped or disk-shaped structure, and the outer contour of the main magnet 121 is the same as or consistent with the shape contour of the washer 122. Optionally, the main magnet 121 and the washer 122 can be circular, elliptical, square, or racetrack-shaped, etc., and are not limited here.

[0056] In this embodiment, the shape and contour of the main magnet 121 and washer 122 of the magnetic circuit section 12 are approximately similar to the shape and contour of the receiving groove of the U-shaped iron 11. Optionally, the U-shaped iron 11 is a cylindrical structure with one end open. The main magnet 121 and washer 122 of the magnetic circuit section 12 are stacked sequentially from bottom to top in the receiving groove, such that the side of the main magnet 121 facing away from the washer 122 is connected to the bottom wall of the receiving groove, and the sidewalls of the main magnet 121 and washer 122 are spaced apart from the sidewalls of the receiving groove to form a magnetic gap 13.

[0057] The sound-generating device 100 of the present invention comprises a magnetic circuit system 1 consisting of a U-shaped iron 11 and a magnetic circuit portion 12. The magnetic circuit portion 12 is fixed in place by utilizing the receiving groove of the U-shaped iron 11, while a magnetic gap 13 is formed between the magnetic circuit portion 12 and the sidewall of the receiving groove of the U-shaped iron 11, allowing the voice coil 2 of the vibration system to be suspended. Thus, when the voice coil 2 is energized, it moves within the magnetic gap 13 of the magnetic circuit system 1, cutting magnetic field lines, thereby causing the diaphragm to vibrate and generate sound. The magnetic circuit portion 12 includes a main magnet 121 stacked within the receiving groove. The sound-generating device 100 incorporates a washer 122, with a recess 1221 on it. The cross-sectional area of ​​the recess 1221 gradually increases and then decreases from the side adjacent to the main magnet 121 to the side away from the main magnet 121. This eliminates the low-permeability portion of the washer 122 in the magnetic circuit section 12, reducing the weight of the magnetic circuit section 12, and fully utilizing the high-permeability portion of the washer 122 in the magnetic circuit section 12. This ensures good BL value and linear range for the sound-generating device 100 while also meeting the design requirements of miniaturization and lightweighting. This sound-generating device 100 not only reduces the weight of the magnetic circuit and increases the magnetic flux of the magnetic gap, but also exhibits better performance in BL linear range and inductance linear range under large signal conditions, reducing distortion and improving sound quality.

[0058] In this embodiment, the cross-sectional area of ​​the cavity 1221 is the area of ​​the cross section perpendicular to the direction of movement of the voice coil 2. Optionally, the cavity 1221 is arranged in a bowl-shaped or jar-shaped structure, that is, the cross-sectional area of ​​the cavity 1221 gradually increases and then decreases from the side adjacent to the main magnet 121 to the side away from the main magnet 121.

[0059] Understandably, the cavity 1221 can be a groove structure or a through-slot structure, etc., and is not limited here. Optionally, the cavity 1221 is located in the middle of the washer 122. By setting the cavity 1221 on the washer 122, the washer 122 forms a stepped structure, thereby eliminating the part of the washer 122 with low magnetic permeability, reducing the weight of the washer 122, and achieving the purpose of weight reduction, while ensuring the magnetic permeability and magnetic field strength of the washer 122 under the action of the main magnet 121.

[0060] To further increase the magnetic flux density at the magnetic gap 13, the inner wall of the cavity 1221 is arc-shaped, making the airflow generated by the diaphragm vibration smoother. In this embodiment, as... Figure 1 and Figure 2 As shown, by removing the portion of the washer 122 with low magnetic permeability from the cavity 1221 of the washer 122, the magnetic flux density of the washer 122 can be increased. Thus, while ensuring the magnetic flux, the weight of the washer 122 can be effectively reduced and the efficiency of the washer 122 can be improved.

[0061] Understandably, to ensure that a constant number of voice coils 2 maintain their maximum displacement within the magnetic gap 13 while cutting magnetic field lines, a long voice coil is used for the voice coil 2. Of course, a short voice coil can also be used; this is not a limitation. Figures 3 to 5 As shown, the stepped washer 122 is used in conjunction with the magnetic gap 13 to make the magnetic flux density at the magnetic gap 13 more uniform, thereby ensuring that the sound generating device 100 has high sensitivity and increasing the linear range of the sound generating device 100 while ensuring the BL value.

[0062] It should be noted that the sound-generating device 100 in this application utilizes the magnetic circuit section 12 paired with a short voice coil to ensure that the vibration range of the voice coil 2 of the sound-generating device 100 is always within the uniform range of the magnetic field, achieving 100% coupling with the magnetic field. This application ensures that the sound-generating device 100 has a larger linear range of BL and inductance, significantly reducing the distortion of the sound-generating device 100 at low frequencies. For details, please refer to [reference needed]. Figure 5 The BL curve shown and Figure 3 and Figure 4 The figure shows the distribution of magnetic field lines when the voice coil 2 is at its maximum displacement.

[0063] In this embodiment, by employing a structure combining a main magnet 121 and a bowl-shaped washer 122, the washer 122, compared to a conventional cylindrical washer, eliminates the middle section with low magnetic permeability. The interior of the washer 122 forms a cavity structure that gradually increases in diameter from the lower surface and then shrinks back down. Figure 1 and Figure 2 As shown.

[0064] Understandably, the inner wall of the cavity 1221 of the washer 122 is composed of countless circular arcs with the same radius but different centers. A section is defined along the axis of symmetry of the magnetic circuit portion 12. The intersection of the center of the arc on the upper surface of the washer 122 and the axis of symmetry is defined as the origin of the coordinate system. The axis of symmetry is defined as the y-axis. The radius of the arc is defined as R, and the coordinates of the center are defined as (x, y). Optionally, 26mm ≤ R ≤ 28mm. The thickness H of the washer 122 along the y-axis is defined, and the length D of the washer 122 along the x-axis is defined. In this embodiment, the coordinates of the center satisfy the following relationships: 0.065 ≤ x / D ≤ 0.075, 0.12 ≤ y / H ≤ 0.15.

[0065] In one embodiment, the thickness of the washer 122 along the vibration direction of the voice coil 2 is defined as H, where 28mm ≤ H ≤ 32mm. Optionally, the thickness H of the washer 122 along the vibration direction of the voice coil 2 can be 28mm, 29mm, 30mm, 31mm, 32mm, etc., and is not limited here.

[0066] In one embodiment, the length D of the washer 122 along the vibration direction perpendicular to the voice coil 2 is defined as 70mm ≤ D ≤ 74mm. Optionally, the length D of the washer 122 along the vibration direction perpendicular to the voice coil 2 can be 70mm, 71mm, 72mm, 73mm, 74mm, etc., and is not limited here. Of course, the washer 122 can be circular, and the length D of the washer 122 along the vibration direction perpendicular to the voice coil 2 can be the outer diameter of the washer 122.

[0067] In one embodiment, the washer 122 includes a main body 1222 and a support 1225. The main body 1222 is provided with a recessed groove 1223. The support 1225 is connected to the main body 1222 and covers the opening of the recessed groove 1223. The support 1225 has an opening 1226 communicating with the recessed groove 1223. The opening 1226 and the recessed groove 1223 surround each other to form a cavity 1221.

[0068] In this embodiment, as Figure 1 and Figure 2 As shown, by setting the washer 122 as a main body 1222 and a support 1225, by providing a recessed groove 1223 in the main body 1222, and connecting the support 1225 to one end of the main body 1222 adjacent to the opening of the recessed groove 1223, the support 1225 covers the opening of the recessed groove 1223. By providing an opening 1226 in the support 1225 that communicates with the recessed groove 1223, the opening 1226 and the recessed groove 1223 enclose and form a cavity 1221.

[0069] Optionally, the inner wall of the recessed groove 1223 is an arc-shaped surface, and the cross-sectional area of ​​the recessed groove 1223 gradually increases from the side adjacent to the main magnet 121 to the side adjacent to the support portion 1225.

[0070] Understandably, the recessed groove 1223 can be selected as a groove structure or a through-groove structure, etc., and is not limited here. The recessed groove 1223 is formed by the side of the washer 122 facing away from the main magnet 121, thus creating a stepped structure in the main body 1222 of the washer 122. This eliminates the portion of the main body 1222 with low magnetic permeability by utilizing the recessed groove 1223, thereby reducing the weight of the washer 122 and achieving the purpose of weight reduction, while ensuring the magnetic permeability and magnetic field strength of the washer 122 under the action of the main magnet 121. Optionally, the recessed groove 1223 is located in the middle of the washer 122.

[0071] In this embodiment, a support portion 1225 is provided at one end of the main body 1222 adjacent to the opening of the recessed groove 1223, thereby further increasing the contact area between the washer 122 and the auxiliary magnet 124, and thus improving the installation stability of the auxiliary magnet 124. In one embodiment, a support surface is formed on the side of the washer 122 facing away from the main magnet 121, and the magnetic circuit portion 12 also includes an auxiliary magnet 124, which is stacked on the support surface.

[0072] Understandable, such as Figure 1 and Figure 2 As shown, a support surface is formed on the side of the support portion 1225 facing away from the cavity 1221, and the auxiliary magnet 124 is stacked on the support surface. In this embodiment, the auxiliary magnet 124 is bonded to the support portion 1225, thereby ensuring that the sound generating device 100 has a good linear range while meeting the requirements of lightweight design.

[0073] In one embodiment, such as Figure 1 As shown, the support portion 1225 is formed by bending and extending the end of the main body portion 1222 adjacent to the opening of the recessed groove 1223 toward the center of the opening of the recessed groove 1223, so that the support portion 1225 and the main body portion 1222 are integrally formed. It can be understood that the washer 122 is a single integral structure, which simplifies the processing and structural strength of the washer 122.

[0074] In another embodiment, such as Figure 2 As shown, a stepped portion 1224 is formed at the end of the main body portion 1222 adjacent to the groove opening of the recessed groove 1223. The support portion 1225 is supported on the stepped portion 1224, and the support portion 1225 is riveted to the main body portion 1222 so that the end of the support portion 1225 is flush with the end of the main body portion 1222.

[0075] In this embodiment, the washer 122 is configured as a two-part structure consisting of a main body 1222 and a support 1225, and the two parts are connected as a single unit by riveting. This allows for separate processing, which reduces processing difficulty and saves costs while ensuring processing accuracy.

[0076] In one embodiment, the thickness of the support portion 1225 gradually increases from the opening 1226 to the periphery of the support portion 1225. Understandably, this arrangement can both ensure the contact area between the support portion 1225 and the auxiliary magnet 124 and reduce the weight of the washer 122.

[0077] Optionally, the angle between the side of the support portion 1225 facing away from the main body 1222 and the side of the support portion 1225 facing the recessed groove 1223 is greater than or equal to 4°. In this embodiment, the side of the support portion 1225 facing away from the main body 1222 is the support surface, and the side of the support portion 1225 facing the recessed groove 1223 is the inner surface. The plane containing the support surface and the plane containing the inner surface form an angle greater than or equal to 4°. Optionally, the support surface is parallel to the horizontal plane. It can be understood that this arrangement achieves the requirement of lightweight while ensuring that the sound-generating device 100 has a good linear range.

[0078] In one embodiment, the U-shaped iron 11 includes a bottom 112 and a side portion 113 connected to the periphery of the bottom 112. The side portion 113 and the bottom 112 enclose each other to form a receiving groove. The distance from the end of the side portion 113 away from the bottom 112 to the bottom 112 is greater than or equal to the distance from the side of the washer 122 facing away from the main magnet 121 to the bottom 112.

[0079] In this embodiment, as Figure 1 and Figure 2 As shown, the U-shaped iron 11 can be a cylindrical structure with an opening at one end. The U-shaped iron 11 includes a bottom 112 and a side portion 113 surrounding the periphery of the bottom 112, such that the side portion 113 and the bottom 112 enclose and form a receiving groove. Optionally, the bottom 112 has a planar plate structure.

[0080] In one embodiment, the bottom 112 of the receiving groove protrudes into the receiving groove to form a support platform 11233. The support platform 11233 and the side 113 of the receiving groove are spaced apart to form a clearance groove 14. The clearance groove 14 is connected to the magnetic gap 13. The main magnet 121 is supported on the support platform 11233.

[0081] In this embodiment, as Figure 1 and Figure 2 As shown, by setting a support platform 1123 on the bottom wall of the receiving groove of U iron 11, the support platform 1123 and the side wall of the receiving groove are spaced apart to form a clearance groove 14, and the clearance groove 14 is correspondingly connected to the magnetic gap 13. Thus, while the support platform 1123 supports and fixes the magnetic circuit part 12, the clearance groove 14 is used to avoid the movement of the voice coil 2 in the magnetic gap 13, so as to ensure the amplitude of the sound generating device 100.

[0082] Understandably, the support platform 1123 can be a protruding structure extending from the bottom wall of the receiving groove. Of course, the support platform 1123 can also be formed by the side of the U-shaped iron 11 facing away from the bottom wall of the receiving groove protruding into the receiving groove, which is not limited here. Optionally, the side of the U-shaped iron 11 facing away from the bottom wall of the receiving groove is recessed to form a groove 1124 corresponding to the support platform 11233.

[0083] In one embodiment, such as Figure 1 As shown, the side 113 and the bottom 112 are integrally molded structures. It can be understood that the side 113 and the bottom 112 of the U-shaped iron 11 can be integrally injection molded, which can simplify the processing steps of the U-shaped iron 11 and improve the structural strength of the U-shaped iron 11.

[0084] In one embodiment, such as Figure 2 As shown, the side portion 113 is provided with a connecting platform 1133, and the bottom portion 112 is provided with an abutment platform 1121. The abutment platform 1121 is riveted to the connecting platform 1133. It can be understood that by setting the U-shaped iron 11 into two parts, the side portion 113 is a cylindrical structure open at both ends. A connecting platform 1133 is provided at one end of the side portion 113, and an abutment platform 1121 is provided around the periphery of the bottom portion 112. This allows the abutment platform 1121 of the bottom portion 112 to be riveted to the connecting platform 1133 of the side portion 113. This separate processing method ensures processing accuracy while reducing processing difficulty and saving costs.

[0085] In one embodiment, the side portion 113 includes a first segment 1131 and a second segment 1132 connected together. The end of the second segment 1132 away from the first segment 1131 is connected to the bottom 112. The thickness of the first segment 1131 is defined as d1, and the thickness of the second segment 1132 is defined as d2, where 0.8 ≤ d1 / d2 ≤ 0.9; or, d1 = d2.

[0086] In this embodiment, as Figure 1 , Figure 3 and Figure 4 As shown, by setting the side portion 113 of the U-iron 11 to a shape with unequal thickness, that is, dividing the side portion 113 into upper and lower parts with the center of the washer 122 as the boundary, namely the first segment 1131 and the second segment 1132, the thickness of the first segment 1131 of the upper part is defined as d1, and the thickness of the second segment 1132 of the lower part is defined as d2, such that 0.8≤d1 / d2≤0.9, thereby ensuring that the unequal thickness side portion 113 matches the stepped washer 122, making the magnetic flux in the magnetic gap 13 more uniform.

[0087] Of course, in other embodiments, such as Figure 2 As shown, the thickness d1 of the first segment 1131 is the same as the thickness d2 of the second segment 1132, and no limitation is made here.

[0088] In one embodiment, the magnetic circuit portion 12 further includes an aluminum ring 123, which is sleeved on the outer periphery of the main magnet 121 and the washer 122.

[0089] In this embodiment, as Figure 1 and Figure 2As shown, by setting an aluminum ring 123 on the outside of the main magnet 121 and the washer 122, the aluminum ring 123 is bonded to the outer periphery of the main magnet 121 and the washer 122, so that the aluminum ring 123 can act as a secondary voice coil, reducing the formation of back electromotive force and reducing third harmonic distortion.

[0090] To further improve the installation stability of the aluminum ring 123, in one embodiment, such as Figure 1 and Figure 2 As shown, a support protrusion 1122 is formed at the bottom 112 of the receiving groove, and an aluminum ring 123 is supported on the support protrusion 1122. It can be understood that the support protrusion 1122 is located on the side of the support platform 1123 facing the clearance groove 14.

[0091] In one embodiment, such as Figure 2 As shown, the main magnet 121 includes a first magnet 1211 and a second magnet 1212. The first magnet 1211 and the second magnet 1212 are stacked and sandwiched between the support platform 11233 and the washer 122.

[0092] Understandably, by setting the main magnet 121 as a two-part structure—a first magnet 1211 and a second magnet 1212—the manufacturing difficulty of the main magnet 121 is reduced. Optional features, such as... Figure 2 As shown, the thickness of the first magnet 1211 is the same as the thickness of the second magnet 1212. Of course, in other embodiments, the thickness of the first magnet 1211 and the thickness of the second magnet 1212 may be different, which is not limited here.

[0093] In one embodiment, the magnetization direction of the first magnet 1211 is the same as that of the second magnet 1212. It is understood that by setting the magnetization directions of the first magnet 1211 and the second magnet 1212 to be the same, the manufacturing process can be simplified and the assembly difficulty reduced.

[0094] In one embodiment, such as Figure 1 and Figure 2 As shown, the support platform 11233 is provided with a first through hole 1125, and the magnetic circuit part 12 is provided with a second through hole 15 corresponding to the first through hole 1125. The second through hole 15 passes through the main magnet 121 and the washer 122 in sequence.

[0095] Understandably, the basin frame has a through hole connecting the cavity, and the U-shaped iron 11 has a first through hole 1125 corresponding to the through hole, penetrating the bottom wall of the receiving groove. The magnetic circuit part 12 has a second through hole 15 corresponding to the first through hole 1125, that is, the auxiliary magnet 124, the washer 122, and the main magnet 121 all have a second through hole 15. In this embodiment, the second through hole 15 penetrates the bottom wall of the recessed groove 1223 / cavity 1221.

[0096] In this embodiment, as Figure 1 and Figure 2 As shown, by setting a through hole on the basket frame and a corresponding through-hole structure on the magnetic circuit section 12, the air pressure balance in the vibration space is ensured when the voice coil 2 drives the diaphragm to vibrate. It is understood that the through hole is opened in the bottom wall of the basket frame cavity and penetrates the bottom wall of the cavity. The magnetic circuit section 12 is fixed to the bottom wall of the basket frame cavity. The U-shaped iron 11 of the magnetic circuit system 1 has a first through hole 1125, and the auxiliary magnet 124, washer 122, and main magnet 121 of the magnetic circuit section 12 all have second through holes 15.

[0097] Understandably, the first through hole 1125 and the second through hole 15 are coaxially arranged. The first through hole 1125 and the second through hole 15 have the same shape and outline, and the first through hole 1125 and the second through hole 15 can be selected as round holes, elliptical holes, triangular holes or square holes, etc., without limitation.

[0098] In this embodiment, the second through hole 15 penetrates the bottom wall of the recessed groove 1223, which can further reduce the weight of the washer 122 and achieve the purpose of weight reduction. Optionally, the second through hole 15 is located in the middle or middle position of the cavity, which can ensure that the magnetic flux density in the magnetic gap 13 is uniform and avoid phenomena such as polarization or oscillation of the voice coil 2, so as to improve the sound output effect of the sound generating device 100.

[0099] In one embodiment, the sound-generating device 100 further includes a basin frame, and a connecting boss 1134 is provided on the outer wall of the U-shaped iron 11. The connecting boss 1134 is connected to one end of the basin frame, and the diaphragm is connected to the other end of the basin frame and is opposite to the magnetic circuit system 1.

[0100] In this embodiment, as Figure 1 and Figure 2 As shown, by providing a connecting boss 1134 on the side 113 of the U-iron 11, the connection stability between the U-iron 11 and the basin frame can be improved when the U-iron 11 and the basin frame are injection molded as one piece.

[0101] Understandably, existing loudspeakers exhibit significant distortion at low frequencies, especially near the resonant frequency. However, the structural design of the sound-generating device 100 in this application can significantly reduce speaker distortion near the resonant frequency F0, controlling the distortion to approximately 0.5%. Compared to conventional magnetic circuits, the magnetic circuit structure of the sound-generating device 100 in this application has a larger magnetic flux gap, resulting in higher speaker efficiency. The linearity of the black gap (BL) and the linearity of the inductance under large-signal operating conditions are significantly superior to conventional structures, reducing nonlinear distortion caused by the speaker's driving force. Simultaneously, the magnetic circuit structure of the sound-generating device 100 in this application effectively achieves the lightweight design requirements of the speaker while creating a large magnetic flux, reducing the difficulty of subsequent assembly.

[0102] The present invention also proposes a terminal device, which includes a device housing and the aforementioned sound-emitting device 100, wherein the sound-emitting device 100 is disposed in the device housing. The specific structure of the sound-emitting device 100 is as described in the foregoing embodiments. Since the present terminal device adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be described in detail here.

[0103] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes: A magnetic circuit system includes a U-shaped iron and a magnetic circuit portion. The U-shaped iron has a receiving groove. The magnetic circuit portion includes a main magnet and a washer stacked within the receiving groove. The main magnet is sandwiched between the bottom of the receiving groove and the washer. The main magnet and the washer are spaced apart from the sides of the receiving groove to form a magnetic gap. The washer includes a main body and a support portion. The main body has a recessed groove. The support portion is connected to the main body and covers the opening of the recessed groove. The support portion has an opening communicating with the recessed groove. The opening and the recessed groove enclose a cavity. The cross-sectional area of ​​the cavity gradually increases and then decreases from the side adjacent to the main magnet to the side away from the main magnet. A vibration system, comprising a diaphragm and a voice coil connected to the diaphragm, the diaphragm being opposite to the magnetic circuit system, the end of the voice coil furthest from the diaphragm being suspended within the magnetic gap, the voice coil being a short voice coil so that the vibration range of the voice coil is always within a uniform magnetic field range.

2. The sound-generating device as described in claim 1, characterized in that, The support portion is formed by bending and extending the end of the main body portion adjacent to the groove opening toward the center of the groove opening, so that the support portion and the main body portion are integrally formed structures; Alternatively, the main body portion may have a stepped portion formed at the end of the groove adjacent to the recessed groove, the support portion may be supported on the stepped portion, and the support portion may be riveted to the main body portion so that the end of the support portion is flush with the end of the main body portion.

3. The sound-generating device as described in claim 1, characterized in that, The thickness of the washer along the vibration direction of the voice coil is defined as H, where 28mm ≤ H ≤ 32mm; And / or, define the length of the washer along the direction perpendicular to the vibration direction of the voice coil as D, 70mm≤D≤74mm; And / or, the inner wall surface of the recessed groove is an arc-shaped surface, and the cross-sectional area of ​​the recessed groove gradually increases from the side adjacent to the main magnet to the side adjacent to the support.

4. The sound-generating device as described in claim 1, characterized in that, The thickness of the support gradually increases from the opening to the periphery of the support; And / or, the angle formed between the side of the support portion facing away from the main body and the side of the support portion facing the recessed groove is greater than or equal to 4°.

5. The sound-generating device as described in claim 1, characterized in that, The U-shaped iron includes a bottom and a side portion connected to the periphery of the bottom. The side portion and the bottom enclose the receiving groove. The distance from the end of the side portion away from the bottom to the bottom is greater than or equal to the distance from the side of the washer facing away from the main magnet to the bottom.

6. The sound-generating device as described in claim 5, characterized in that, The side portion and the bottom portion are integrally formed. Alternatively, the side is provided with a connecting platform, and the bottom is provided with an abutment platform, which is riveted to the connecting platform.

7. The sound-generating device as described in claim 5, characterized in that, The side portion includes a first segment and a second segment connected together. The end of the second segment away from the first segment is connected to the bottom. The thickness of the first segment is defined as d1, and the thickness of the second segment is defined as d2. 0.8≤d1 / d2≤0.9; or, d1=d2.

8. The sound-generating device as described in any one of claims 1 to 7, characterized in that, The magnetic circuit section also includes an aluminum ring, which is sleeved on the outer periphery of the main magnet and the washer.

9. The sound-generating device as described in claim 8, characterized in that, A support protrusion is formed at the bottom of the receiving groove, and the aluminum ring is supported on the support protrusion; And / or, the aluminum ring is bonded to the outer periphery of the main magnet and the washer.

10. The sound-generating device according to any one of claims 1 to 7, characterized in that, The washer has a support surface on the side opposite to the main magnet, and the magnetic circuit portion also includes a secondary magnet, which is stacked on the support surface.

11. The sound-generating device as claimed in any one of claims 1 to 7, characterized in that, The bottom of the receiving groove protrudes towards the inside of the receiving groove to form a support platform. The support platform and the side of the receiving groove are spaced apart to form a clearance groove. The clearance groove is connected to the magnetic gap. The main magnet is supported on the support platform.

12. The sound-generating device as claimed in claim 11, characterized in that, The main magnet includes a first magnet and a second magnet, which are stacked and sandwiched between the support platform and the washer. And / or, the side of the U-shaped iron facing away from the bottom wall of the receiving groove is recessed to form a groove corresponding to the support platform; And / or, the support platform is provided with a first through hole, and the magnetic circuit part is provided with a second through hole corresponding to the first through hole, the second through hole sequentially passing through the main magnet and the washer; And / or, the sound-generating device further includes a basin frame, the outer wall of the U-shaped iron is provided with a connecting boss, the connecting boss is connected to one end of the basin frame, the diaphragm is connected to the other end of the basin frame and is opposite to the magnetic circuit system.

13. A terminal device, characterized in that, It includes a device housing and a sound-generating device as described in any one of claims 1 to 12, wherein the sound-generating device is disposed in the device housing.

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