Sounding device

Abstract

The invention provides a sounding device. The sounding device comprises a basin stand, a vibration system and a magnetic circuit system, the vibration system comprises a vibrating diaphragm and a voice coil; the magnetic circuit system comprises a magnetic steel assembly and auxiliary magnetic steel spaced from the magnetic steel assembly to form a magnetic gap. The voice coil is inserted and suspended in the magnetic gap; the magnetic steel assembly comprises main magnetic steel, a through hole formed by penetrating through the main magnetic steel in the first direction and an adjusting assembly located in the through hole. The adjusting assembly comprises moving magnetic steel fixed on one side, close to the magnetic circuit system, of the vibrating diaphragm and fixed magnetic steel fixed on the inner side wall of the through hole and opposite to the moving magnetic steel at intervals. The moving magnetic steel and the fixed magnetic steel form repulsive force all the time in the moving stroke of the moving magnetic steel. According to the sound production device, the low-frequency sensitivity of the sound production device can be improved, the vibration system has a reset trend in the transverse deviation direction of the vibration system, the larger the deviation is, the larger the repulsive force is, and the balance of the vibration system in the transverse deviation direction of the vibration system can be kept.

Description

Sound generating device Technical Field

[0001] This invention relates to the field of electroacoustic conversion technology, and more particularly to a sound-generating device. Background Technology

[0002] With the development of electronic technology, portable electronic products are becoming increasingly popular, such as mobile phones, handheld game consoles, and smartwatches. These electronic products generally use sound-generating devices for volume feedback.

[0003] The sound-generating device in the related technology mainly includes a basket frame, a vibration system fixed on opposite sides of the basket frame, and a magnetic circuit system. The magnetic circuit system is used to drive the vibration system to generate sound. The vibration system includes a diaphragm fixed on the side of the basket frame away from the magnetic circuit system and a voice coil fixed on the side of the diaphragm close to the magnetic circuit system. The magnetic circuit system includes a lower clamp fixed on the side of the basket frame away from the vibration system, a main magnet and a secondary magnet stacked and fixed on the side of the lower clamp fixed close to the vibration system. The secondary magnet is arranged around the main magnet and spaced to form a magnetic gap. The voice coil is inserted and suspended in the magnetic gap to drive the diaphragm to vibrate and generate sound.

[0004] In order to improve the low-frequency sensitivity of sound-generating devices, the relevant technology adopts the improvement method of placing soft magnets on the voice coil, so as to improve the low-frequency sensitivity of the sound-generating device through the attraction between the soft magnets and the main magnets and auxiliary magnets.

[0005] Although the above-mentioned improvement methods can enhance the low-frequency sensitivity of the sound-generating device, the direction of the restoring force of the vibration system is the same as the direction of the suction force, and the greater the offset, the greater the suction force. Therefore, the vibration system will be unstable in its lateral offset direction.

[0006] Therefore, it is necessary to provide a new sound-generating device to solve the above-mentioned technical problems. Summary of the Invention

[0007] The purpose of this invention is to provide a new sound-generating device to solve the problem of instability of the vibration system in the lateral offset direction of sound-generating devices in related technologies.

[0008] To achieve the above objectives, the present invention provides a sound-generating device, comprising a frame, a vibration system fixed to opposite sides of the frame, and a magnetic circuit system, wherein the magnetic circuit system drives the vibration system to vibrate and generate sound; the vibration system includes a diaphragm fixed to the side of the frame away from the magnetic circuit system and a voice coil fixed to the diaphragm near the magnetic circuit system; the magnetic circuit system includes magnet assemblies respectively fixed to the side of the frame away from the vibration system and auxiliary magnets arranged around the magnet assemblies and spaced apart to form magnetic gaps; the voice coil is inserted and suspended within the magnetic gaps; the vibration direction of the vibration system is defined as a first direction;

[0009] The magnet assembly includes a main magnet, a through hole formed through the main magnet along the first direction, and an adjustment assembly located within the through hole; the adjustment assembly includes a moving magnet fixed to the side of the diaphragm near the magnetic circuit system and a fixed magnet fixed to the inner sidewall of the through hole and spaced apart from the moving magnet; the moving magnet always forms a repulsive force with the fixed magnet during its movement stroke.

[0010] Preferably, the moving magnet includes a first moving sub-magnet, a second moving sub-magnet, and a third moving sub-magnet connected in sequence along the first direction; when the vibration system is in the initial position, the repulsive force between the second moving sub-magnet and the fixed magnet is less than the repulsive force between the first moving sub-magnet and the fixed magnet, and less than the repulsive force between the third moving sub-magnet and the fixed magnet.

[0011] Preferably, the thickness of the moving magnet along the first direction is greater than the thickness of the fixed magnet along the first direction, and the orthographic projection of the fixed magnet onto the moving magnet along a third direction completely covers the range of the second moving sub-magnet, wherein the third direction is perpendicular to the first direction.

[0012] Preferably, the fixed magnet includes a first fixed sub-magnet fixed to the inner sidewall of the through hole; the moving magnet also includes a first moving groove formed by the second moving sub-magnet being recessed from the side of the second moving sub-magnet close to the first fixed sub-magnet in a direction away from the first fixed sub-magnet; the first moving groove penetrates the second moving sub-magnet along the second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0013] Preferably, the magnetization direction of the first fixed sub-magnet is the same as and parallel to the magnetization direction of the moving magnet.

[0014] Preferably, the magnetization direction of the first fixed sub-magnet is opposite to and parallel to the magnetization direction of the moving magnet.

[0015] Preferably, the moving magnet is located at the center of the through hole; the fixed magnet further includes a second fixed sub-magnet fixed to the inner wall of the through hole, the second fixed sub-magnet and the first fixed sub-magnet being arranged at equal intervals around the moving magnet; the moving magnet further includes a second moving groove formed by a recess along the third direction on the side of the second moving sub-magnet closer to the second fixed sub-magnet; the second moving groove penetrates the second moving sub-magnet along the second direction; the magnetization direction of the first fixed sub-magnet is the same as the magnetization direction of the second fixed sub-magnet and parallel to the third direction, and the magnetization direction of the moving magnet is opposite to the magnetization direction of the first fixed sub-magnet.

[0016] Preferably, the fixed magnet includes a first fixed sub-magnet fixed to the inner wall of the through hole; the second moving sub-magnet is made of a non-magnetic material.

[0017] Preferably, the magnetization directions of the first moving sub-magnet and the third moving sub-magnet are the same and parallel to the third direction, and the magnetization direction of the first fixed sub-magnet is opposite to the magnetization direction of the first moving sub-magnet.

[0018] Preferably, the magnetization direction of the first fixed sub-magnet is parallel to the first direction; the magnetization directions of the first moving sub-magnet and the third moving sub-magnet respectively form an angle with the magnetization direction of the first fixed sub-magnet, and the angle is greater than 0° and less than 90°.

[0019] Preferably, the moving magnet is located at the center of the through hole; the fixed magnet further includes a second fixed sub-magnet fixed to the inner wall of the through hole, the second fixed sub-magnet and the first fixed sub-magnet being arranged at equal intervals around the moving magnet; the magnetization direction of the second fixed sub-magnet is the same as the magnetization direction of the first fixed sub-magnet and parallel to the third direction, and the magnetization direction of the second fixed sub-magnet is opposite to the magnetization direction of the moving magnet.

[0020] Preferably, the fixed magnet includes a fixed top magnet and a fixed bottom magnet. The fixed top magnet and the fixed bottom magnet are each fixed to the inner sidewall of the through hole on the side away from the moving magnet, and the fixed top magnet and the fixed bottom magnet are spaced apart along the first direction to form a gap. The orthogonal projection of the moving magnet onto the gap along a third direction completely covers the range of the gap, and the third direction is perpendicular to the first direction.

[0021] Preferably, the thickness of the moving magnet along the first direction is less than the thickness of the fixed magnet along the first direction; the fixed magnet further includes a fixed connecting magnet fixed between the fixed top magnet and the fixed bottom magnet, and the side of the fixed connecting magnet away from the moving magnet is fixed to the inner wall of the through hole; when the vibration system is in the initial position, the repulsive force between the moving magnet and the fixed connecting magnet is less than the repulsive force between the moving magnet and the fixed top magnet, and less than the repulsive force between the moving magnet and the fixed bottom magnet.

[0022] Preferably, the moving magnet is located at the center of the through hole; the fixed magnet includes two fixed magnets, which are arranged at equal intervals around the moving magnet; each fixed magnet also includes a fixing groove formed by the side of the fixed connecting magnet near the moving magnet being recessed in a direction away from the moving magnet; the fixing groove penetrates the fixed connecting magnet along a second direction, and the first direction, the second direction, and the third direction are mutually perpendicular; the magnetization directions of the two fixed magnets are the same and parallel to the third direction, and the magnetization direction of the moving magnet is opposite to the magnetization direction of the fixed magnet.

[0023] Preferably, the moving magnet is located at the center of the through hole; the fixed magnet includes two fixed magnets, which are arranged at equal intervals around the moving magnet; the fixed connecting magnet in each fixed magnet is made of non-magnetic material; the magnetization direction of the fixed top magnet in each fixed magnet is the same as the magnetization direction of the fixed bottom magnet and is parallel to the third direction, and the magnetization direction of the moving magnet is opposite to the magnetization direction of the fixed top magnet.

[0024] Preferably, the adjustment assembly further includes an isolation soft magnet sandwiched between the fixed magnet and the inner wall of the through hole, and a central clamping plate sandwiched between the diaphragm and the moving magnet; the fixed magnet is fixed to the inner wall of the through hole by the isolation soft magnet, and the moving magnet is fixed to the diaphragm by the central clamping plate.

[0025] Compared with related technologies, the sound-generating device of the present invention has a through hole on the main magnet, a fixed magnet on the inner wall of the through hole, and a moving magnet fixed to the diaphragm and spaced apart from the fixed magnet. At the same time, the moving magnet is limited to always forming a repulsive force with the fixed magnet during its movement stroke. This makes the direction of the restoring force of the vibration system during vibration opposite to the direction of the repulsive force, so that the stiffness of the vibration system is reduced by the repulsive force during vibration, thereby improving the low-frequency sensitivity of the sound-generating device. At the same time, the vibration system has a tendency to reset in its lateral offset direction, and the greater the offset, the greater the repulsive force, which is beneficial to maintaining the balance of the vibration system in its lateral offset direction. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments 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 these drawings without creative effort. Among them: Figure 1 is a three-dimensional structural schematic diagram of the sound-generating device provided in Embodiment 1 of the present invention; Figure 2 is a partial structural exploded view of the sound-generating device provided in Embodiment 1 of the present invention; Figure 3 is a cross-sectional view along line AA in Figure 1; Figure 4 is a comparison diagram of the total harmonic distortion curves of the sound-generating device provided in Embodiment 1 of the present invention and the sound-generating devices provided by related technologies; Figure 5 is a diagram of the present invention. Figure 6 is a schematic diagram of the fixed magnet and the moving magnet in the initial state of the sound-generating device provided in Embodiment 1 of the present invention, wherein the dashed single arrow indicates the magnetization direction and the solid single arrow indicates the motion direction; Figure 7 is a schematic diagram of the fixed magnet and the moving magnet in the sound-generating device provided in Embodiment 1 of the present invention in the full amplitude state; Figure 8 is a graph of the repulsive force of the moving magnet in the sound-generating device provided in Embodiment 1 of the present invention changing with displacement in each state; Figure 9 is a schematic diagram of the magnetic circuit of the moving magnet and the fixed magnet in the sound-generating device provided in Embodiment 1 of the present invention; Figure 10 is a schematic diagram of the vibration system in the sound-generating device provided in Embodiment 1 of the present invention. Figure 11 is a schematic diagram of the magnetic circuit of the main magnet and auxiliary magnet in the sound-generating device provided in Embodiment 1 of the present invention; Figure 12 is a comparison diagram of the stiffness and displacement curves of the sound-generating device provided in the embodiment of the present invention and the sound-generating device provided in related technologies; Figure 13 is a schematic diagram of the arrangement of fixed magnets and moving magnets in the sound-generating device provided in Embodiment 2 of the present invention, wherein the dashed single arrow indicates the magnetization direction, Figure 13(a) is a schematic diagram of the first magnetization direction arrangement, and Figure 13(b) is a schematic diagram of the second magnetization direction arrangement; Figure 14 is a schematic diagram of the arrangement of fixed magnets and moving magnets in the sound-generating device provided in Embodiment 3 of the present invention, wherein the dashed single arrow indicates the magnetization direction, Figure 14 Figure 14(a) is a schematic diagram of the first magnetization direction arrangement, and Figure 14(b) is a schematic diagram of the second magnetization direction arrangement; Figure 15 is a schematic diagram of the arrangement of fixed magnets and moving magnets in the sound-generating device provided in Embodiment 4 of the present invention, wherein the dashed single arrow indicates the magnetization direction; Figure 16 is a schematic diagram of the arrangement of fixed magnets and moving magnets in the sound-generating device provided in Embodiment 5 of the present invention, wherein the dashed single arrow indicates the magnetization direction; Figure 17 is a schematic diagram of the arrangement of fixed magnets and moving magnets in the sound-generating device provided in Embodiment 6 of the present invention, wherein the dashed single arrow indicates the magnetization direction; Figure 18 is a schematic diagram of the arrangement of fixed magnets and moving magnets in the sound-generating device provided in Embodiment 7 of the present invention, wherein the dashed single arrow indicates the magnetization direction.

[0027] Among them: 100, sound-generating device; 1, frame; 11, protrusion; 2, vibration system; 21, diaphragm; 211, vibrating part; 212, surround part; 213, fixing part; 214, dome; 22, voice coil; 23, elastic element; 24, frame; 25, auxiliary diaphragm; 3, magnetic circuit system; 30, magnetic gap; 31, lower clamping plate; 32, magnet assembly; 321, main magnet; 322, through hole; 3221, inner sidewall; 323, adjustment assembly; 3231, fixing magnet; 32311, first fixing sub-magnet; 32312, second fixing... Stator magnet; 32313, fixed top magnet; 32314, fixed connecting magnet; 323141, fixed groove; 32315, fixed bottom magnet; 32316, gap; 3232, moving magnet; 32321, first moving sub-magnet; 32322, second moving sub-magnet; 323221, first moving groove; 323222, second moving groove; 32323, third moving sub-magnet; 3233, isolation soft magnet; 3234, center clamp; 33, auxiliary magnet; 34, pole core; 35, upper clamp; 351, clearance groove. Detailed Implementation

[0028] 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 them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1 This embodiment of the invention provides a sound generating device 100, as shown in Figures 1 to 12, which includes a frame 1, a vibration system 2 fixed to opposite sides of the frame 1, and a magnetic circuit system 3. The magnetic circuit system 3 is used to drive the vibration system 2 to vibrate and generate sound.

[0030] The sound-generating device 100 is rectangular. The vibration direction of the vibration system 2 is defined as the first direction, the minor axis direction of the sound-generating device 100 as the second direction, and the major axis direction of the sound-generating device 100 as the third direction. As shown in Figures 1 to 3, the first direction is the Z-axis, the second direction is the Y-axis, and the third direction is the X-axis.

[0031] The vibration system 2 includes a diaphragm 21 fixed to the side of the frame 1 away from the magnetic circuit system 3 and a voice coil 22 fixed to the side of the diaphragm 21 close to the magnetic circuit system 3.

[0032] The diaphragm 21 includes an annular vibrating portion 211, a folded ring portion 212 extending from the outer periphery of the vibrating portion 211 towards the direction of the frame 1, a fixing portion 213 extending from the outer periphery of the folded ring portion 212 towards the direction of the frame 1 and fixed to the frame 1, and a dome 214 covering and fixed to the side of the vibrating portion 211 away from the magnetic circuit system 3. This design can increase the total mass of the diaphragm 21 through the dome 214, making its vibration and sound production effect better.

[0033] The vibration system 2 also includes an elastic element 23, a frame 24, and an auxiliary diaphragm 25.

[0034] Two elastic elements 23 are fixed to opposite sides of the frame 1, located on the side of the frame 1 away from the diaphragm 21. A ring-shaped frame 24 is connected to the opposite sides of each elastic element 23 at the end away from the frame 1. The end of the frame 24 away from the elastic elements 23 is connected to the fixing part 213 and the dome 214. One elastic element 23 extends towards the voice coil 22 from the end away from the frame 1 and forms an electrical connection with the voice coil 22. Two auxiliary diaphragms 25 are fixed to the side of each elastic element 23 away from the diaphragm 21. This design improves the sound production effect of the vibration system 2.

[0035] The magnetic circuit system 3 includes a lower clamping plate 31 fixed to the side of the frame 1 away from the vibration system 2, a magnet assembly 32 and a secondary magnet 33 stacked and fixed to the side of the lower clamping plate 31 near the vibration system 2, the secondary magnet 33 surrounding the magnet assembly 32 and spaced to form magnetic gaps 30; the voice coil 22 is inserted and suspended within the magnetic gaps 30. Of course, depending on actual needs, the lower clamping plate 31 may not be necessary, and only the magnet assembly 32 and the secondary magnet 33 are needed to generate the driving force to drive the vibration system 2 to vibrate and produce sound.

[0036] The magnet assembly 32 includes a main magnet 321 fixed to the lower clamping plate 31, a through hole 322 formed through the main magnet 321 along a first direction, and an adjustment assembly 323 located in the through hole 322. The adjustment assembly 323 includes a moving magnet 3232 fixed to the side of the diaphragm 21 near the magnetic circuit system 3 and spaced apart from the lower clamping plate 31, and a fixed magnet 3231 fixed to the inner sidewall 3221 of the through hole 322 and spaced apart from the moving magnet 3232. The moving magnet 3232 always forms a repulsive force with the fixed magnet 3231 during its movement stroke. This design allows for easy adjustment of component 323, and the moving magnet 3232 is always subjected to the repulsive force of the fixed magnet 3231. The direction of the repulsive force on the moving magnet 3232 is opposite to the direction of the restoring force of the lateral offset of the vibration system 2. This reduces the stiffness of the vibration system 2 during vibration, thereby improving the low-frequency sensitivity of the sound-generating device 100 and maintaining the balance of the vibration system 2. Four auxiliary magnets 33 are included and located around the main magnet 321, with the four auxiliary magnets 33 spaced apart. This design enhances the magnetic effect of the magnetic circuit system 3.

[0037] The magnetic circuit system 3 also includes a pole core 34 stacked and fixed on the side of the main magnet 321 away from the lower clamping plate 31, and an upper clamping plate 35 stacked and fixed on the side of the auxiliary magnet 33 away from the lower clamping plate 31 in an annular shape; the side of the upper clamping plate 35 away from the auxiliary magnet 33 is fixed to the frame 1. This design can improve the magnetic effect of the magnetic circuit system 3.

[0038] The upper clamping plate 35 has four corners with clearance grooves 351 extending through it in the first direction; the basin frame 1 has a protruding part 11 that extends to the auxiliary magnet 33 at the position corresponding to the clearance groove 351, and the protruding part 11 is also fixedly connected to the upper clamping plate 35. This design can improve the fixing effect of the magnetic circuit system 3.

[0039] The moving magnet 3232 includes a first moving sub-magnet 32321, a second moving sub-magnet 32322, and a third moving sub-magnet 32323 connected in sequence along the first direction. When the vibration system 2 is in the initial position, that is, when the vibration system 2 is not vibrating or when the sound-generating device 100 is not turned on, the repulsive force between the second moving sub-magnet 32322 and the fixed magnet 3231 is less than the repulsive force between the first moving sub-magnet 32321 and the fixed magnet 3231, and less than the repulsive force between the third moving sub-magnet 32323 and the fixed magnet 3231. The repulsive force can also be called a repulsive force.

[0040] The first moving sub-magnet 32321, the second moving sub-magnet 32322, and the third moving sub-magnet 32323 can be an integral structure or three structures that are stacked and fixed in sequence.

[0041] When the vibration system 2 vibrates, the moving magnet 3232 is repulsed by the fixed magnet 3231. In the first direction, the repulsive force is consistent with the displacement direction of the vibration system 2. In the third direction, the repulsive force causes the magnetic gap 30 to tend to expand. When the vibration system 2 vibrates, its overall stiffness will decrease, which is beneficial to improving the low-frequency sensitivity of the sound-generating device 100. At the same time, the repulsive force in the third direction is beneficial to improving the vibration balance of the vibration system 2. As shown in Figure 4, after adding the adjustment component 323, the total stiffness of the sound-generating device 100 decreases. Except for the initial position displacement THD (Total Harmonic Distortion) increasing, the overall THD decreases significantly. That is, the addition of the adjustment component 323 to the sound-generating device 100 improves its distortion performance.

[0042] The thickness of the moving magnet 3232 along the first direction is greater than the thickness of the fixed magnet 3231 along the first direction. The orthographic projection of the fixed magnet 3231 onto the moving magnet 3232 along the third direction completely covers the area of ​​the second moving sub-magnet 32322. This is one design method that makes the repulsive force between the second moving sub-magnet 32322 and the fixed magnet 3231 less than the repulsive force between the first moving sub-magnet 32321 and the fixed magnet 3231, and less than the repulsive force between the third moving sub-magnet 32323 and the fixed magnet 3231.

[0043] The fixed magnet 3231 includes a first fixed sub-magnet 32311 fixed to the inner sidewall 3221 of the through hole 322; the moving magnet 3232 also includes a first moving groove 323221 formed by the second moving sub-magnet 32322 recessed from the side of the second moving sub-magnet 32322 close to the first fixed sub-magnet 32311 in a direction away from the first fixed sub-magnet 32311; the first moving groove 323221 penetrates the second moving sub-magnet 32322 along a second direction.

[0044] The moving magnet 3232 is located at the center of the through hole 322; the fixed magnet 3231 also includes a second fixed sub-magnet 32312 fixed to the inner sidewall 3221 of the through hole 322, the second fixed sub-magnet 32312 and the first fixed sub-magnet 32311 are arranged at equal intervals around the moving magnet 3232; the moving magnet 3232 also includes a second moving groove 323222 formed by the second moving sub-magnet 32322 recessed along a third direction on the side of the second moving sub-magnet 32322 close to the second fixed sub-magnet 32312; the second moving groove 323222 penetrates the second moving sub-magnet 32322 along a second direction; the magnetization direction of the first fixed sub-magnet 32311 is the same as the magnetization direction of the second fixed sub-magnet 32312 and parallel to the third direction, the magnetization direction of the moving magnet 3232 is opposite to the magnetization direction of the first fixed sub-magnet 32311, at this time the moving magnet 3232 is H-shaped. This is one way of using fixed magnet 3231 and moving magnet 3232. This design can reduce the stiffness of small amplitudes and make the stiffness (K) and displacement (X) curves nonlinear, while reducing the stiffness of the vibration system 2 near the equilibrium position and under large amplitudes, as shown in Figure 12.

[0045] The magnetization direction of the moving magnet 3232 includes the magnetization direction of the first moving sub-magnet 32321, the magnetization direction of the second moving sub-magnet 32322, and the magnetization direction of the third moving sub-magnet 32323.

[0046] As shown in Figure 5, the total thickness H of the moving magnet 3232 along the first direction is 1mm, the thickness H1 of the second fixed sub-magnet 32312 along the first direction is 0.4mm, the thickness H2 of the first moving sub-magnet 32321 along the first direction and the thickness H3 of the third moving sub-magnet 32323 along the first direction are the same and 0.3mm, the length L1 of the moving magnet 3232 along the third direction is 1.6mm, and the length L2 of the second moving sub-magnet 32322 along the third direction is 0.8mm; the distance G between the fixed magnet 3231 and the moving magnet 3232 is 0.2mm, the length L3 of the fixed magnet 3231 along the third direction is 0.8mm, and the thickness H3 of the fixed magnet 3231 along the first direction is 0.4mm. Of course, this is only one design of the moving magnet 3232 and the fixed magnet 3231; the corresponding dimensions can be adaptively adjusted according to the overall dimensions of the sound-generating device 100.

[0047] As shown in Figure 5, when the vibration system 2 is not driven by the magnetic circuit system 3 or is in its initial state, the second moving sub-magnet 32322 is directly opposite the fixed magnet 3231, with the distance between them being the largest, and the moving magnet 3232 experiences a small repulsive force. As shown in Figure 6, the third moving sub-magnet 32323 is directly opposite the fixed magnet 3231, with the distance between them being small, and the moving magnet 3232 experiences a large repulsive force, which gradually increases to the maximum. Of course, when the first moving sub-magnet 32321 is directly opposite the fixed magnet 3231, the distance between them is small, and the moving magnet 3232 also experiences a large repulsive force. As shown in Figure 7, the moving magnet 3232 gradually moves away from the fixed magnet 3231, and the force on the moving magnet 3232 is also the minimum. As shown in Figure 8, the curve in the figure is a graph of the repulsive force (F) of the moving magnet 3232 changing with displacement in each state. The magnetic circuit diagram of the moving magnet 3232 and the fixed magnet 3231 is shown in Figure 9. The transverse force (Fx) and displacement curve of the vibration system 2 are shown in Figure 10. The magnetic circuit of the main magnet 321 and the auxiliary magnet 33 in the magnetic circuit system 3 is shown in Figure 11.

[0048] Of course, depending on actual needs, the design of the fixed magnet 3231 and the moving magnet 3232 can also adjust the stiffness according to the amplitude of the vibration system 2. The specific dimensions are set according to the required stiffness curve, as shown in Figure 12, which is equivalent to setting the stiffness according to the curve of the repulsive force on the moving magnet 3232 as the displacement changes.

[0049] As shown in Figure 2 or Figure 3, the adjustment assembly 323 also includes an isolation soft magnet 3233 sandwiched between the fixed magnet 3231 and the inner wall 3221 of the through hole 322; the fixed magnet 3231 is fixed to the inner wall 3221 of the through hole 322 by the isolation soft magnet 3233. This design can separate the main magnet 321 from the fixed magnet 3231 by the isolation soft magnet 3233.

[0050] As shown in Figure 2 or Figure 3, the adjustment assembly 323 also includes a central clamping plate 3234 sandwiched between the diaphragm 21 and the moving magnet 3232; the moving magnet 3232 is fixed to the diaphragm 21 by the central clamping plate 3234. This design can improve the magnetic effect of the moving magnet 3232.

[0051] Compared with related technologies, the sound-generating device 100 in this embodiment provides a through hole 322 on the main magnet 321, a fixed magnet 3231 is provided on the inner sidewall 3221 of the through hole 322, and a moving magnet 3232 is fixed to the diaphragm 21 and spaced apart from the fixed magnet 3231. The moving magnet 3232 is also limited to always forming a repulsive force with the fixed magnet 3231 within its movement stroke. Thus, the direction of the restoring force of the vibration system 2 during vibration is opposite to the direction of this repulsive force, thereby reducing the stiffness of the vibration system 2 during vibration through this repulsive force, thereby improving the low-frequency sensitivity of the sound-generating device 100, and simultaneously making the vibration system 2... The system tends to return to its original position in the lateral offset direction, and the greater the offset, the greater the repulsive force, which helps to maintain the balance of the vibration system 2 in the lateral offset direction. In this embodiment, the repulsive force formed by the moving magnet 3232 and the fixed magnet 3231 includes the repulsive force in the lateral offset direction and the repulsive force in the vibration direction when the vibration system 2 vibrates. The direction of the restoring force of the lateral offset when the vibration system 2 vibrates is opposite to that of the repulsive force in the lateral offset direction. The repulsive force in the vibration direction when the vibration system 2 vibrates is opposite to the restoring force of the vibration system 2, so as to reduce the stiffness of the vibration system 2 when the vibration system 2 vibrates, thereby further improving the low-frequency sensitivity of the sound generating device 100.

[0052] The difference between Embodiment 2 and Embodiment 1 is that, as shown in Figure 13, in this embodiment, the fixed magnet 3231 only includes a first fixed sub-magnet 32311 fixed to the inner sidewall 3221 of the through hole 322; the moving magnet 3232 also includes a first moving groove 323221 formed by the second moving sub-magnet 32322 being recessed from the side of the second moving sub-magnet 32322 close to the first fixed sub-magnet 32311 toward the direction away from the first fixed sub-magnet 32311; the first moving groove 323221 penetrates the second moving sub-magnet 32322 along the second direction.

[0053] As shown in Figure 13(a), the magnetization direction of the first fixed sub-magnet 32311 is the same as and parallel to the first direction of the magnetization direction of the moving magnet 3232. This is one of the magnetization methods of the first fixed sub-magnet 32311 and the moving magnet 3232 in this embodiment.

[0054] In addition, the magnetization direction of the first fixed magnet 32311 and the magnetization direction of the moving magnet 3232 can also be designed as follows: as shown in Figure 13(b), the magnetization direction of the first fixed magnet 32311 is opposite to the magnetization direction of the moving magnet 3232 and parallel to a third direction.

[0055] This embodiment only reduces the second fixed magnet 32312 and the second moving groove 323222 corresponding to the second fixed magnet 32312, but it can still achieve the technical effect achieved by the sound generating device 100 in the first embodiment, which will not be elaborated here.

[0056] The difference between Embodiment 3 and Embodiment 1 is that, as shown in Figure 14, in this embodiment, the fixed magnet 3231 only includes the first fixed sub-magnet 32311 fixed to the inner sidewall 3221 of the through hole 322; the second moving sub-magnet 32322 is made of non-magnetic material.

[0057] As shown in Figure 14(a), the magnetization directions of the first moving sub-magnet 32321 and the third moving sub-magnet 32323 are the same and parallel to the third direction, while the magnetization direction of the first fixed sub-magnet 32311 is opposite to that of the first moving sub-magnet 32321. This is one of the magnetization methods for the fixed magnet 3231 and the moving magnet 3232 in this embodiment.

[0058] In addition, the magnetization direction of the first fixed sub-magnet 32311 and the magnetization directions of the first moving sub-magnet 32321 and the third moving sub-magnet 32323 can also be designed as follows: as shown in Figure 14(b), the magnetization direction of the first fixed sub-magnet 32311 is parallel to the first direction; the magnetization directions of the first moving sub-magnet 32321 and the third moving sub-magnet 32323 form an angle with the magnetization direction of the first fixed sub-magnet 32311, with the angle being greater than 0° and less than 90°. This is another magnetization method for the fixed magnet 3231 and the moving magnet 3232 in this embodiment.

[0059] Of course, depending on actual needs, the second motion sub-magnet 32322 may not be designed for the motion magnet 3232. In this case, the first motion sub-magnet 32321 is directly fixed to the diaphragm 21, while the third motion sub-magnet 32323 can be connected to the diaphragm 21 by bypassing the first motion sub-magnet 32321 through a non-magnetic material.

[0060] This embodiment only changes the design of the fixed magnet 3231 and the moving magnet 3232, but it can still achieve the technical effect of the sound-generating device 100 in Embodiment 1, which will not be elaborated here.

[0061] The difference between Embodiment 4 and Embodiment 3 is that, as shown in Figure 15, in this embodiment, the moving magnet 3232 is located at the center of the through hole 322; the fixed magnet 3231 also includes a second fixed sub-magnet 32312 fixed to the inner sidewall 3221 of the through hole 322, and the second fixed sub-magnet 32312 and the first fixed sub-magnet 32311 are arranged at equal intervals around the moving magnet 3232.

[0062] The magnetization direction of the second fixed magnet 32312 is the same as that of the first fixed magnet 32311 and parallel to the third direction. The magnetization direction of the second fixed magnet 32312 is opposite to that of the moving magnet 3232.

[0063] This embodiment differs from Embodiment 3 only by adding a second fixed magnet 32312, but it can still achieve the technical effect achieved by the sound-generating device 100 in Embodiment 1, and will not be elaborated here.

[0064] The difference between Embodiment 5 and Embodiment 1 is that, as shown in Figure 16, the fixed magnet 3231 includes a fixed top magnet 32313 and a fixed bottom magnet 32315. The fixed top magnet 32313 and the fixed bottom magnet 32315 are each fixed to the inner sidewall 3221 of the through hole 322 on the side away from the moving magnet 3232. The fixed top magnet 32313 and the fixed bottom magnet 32315 are spaced apart along the first direction to form a gap 32316. The orthogonal projection of the moving magnet 3232 along the third direction onto the gap 32316 completely covers the range of the gap 32316.

[0065] The two fixed magnets 3231 are magnetized in the same direction and parallel to a third direction; the moving magnet 3232 is magnetized in the opposite direction to the fixed magnets 3231.

[0066] The magnetization direction of the fixed magnet 3231 includes the magnetization direction of the fixed top magnet 32313 and the magnetization direction of the fixed bottom magnet 32315.

[0067] In this embodiment, since there is a gap 32316 between the fixed top magnet 32313 and the fixed bottom magnet 32315, the repulsive force of the moving magnet 3232 is minimal when it is positioned relative to the gap 32316 along the third direction. At the same time, the change in repulsive force when the moving magnet 3232 moves along the first direction will be the same as the change in repulsive force when the moving magnet 3232 moves along the first direction in Embodiment 1, which will not be described in detail here.

[0068] Since this embodiment only changes the corresponding positions of the fixed magnet 3231 and the moving magnet 3232, it can also achieve the technical effect achieved by the sound-generating device 100 in Embodiment 1, and will not be elaborated here.

[0069] The difference between Embodiment 6 and Embodiment 5 is that, as shown in Figure 17, the fixed magnet 3231 further includes a fixed connecting magnet 32314 fixed between the fixed top magnet 32313 and the fixed bottom magnet 32315. The side of the fixed connecting magnet 32314 away from the moving magnet 3232 is fixed to the inner sidewall 3221 of the through hole 322.

[0070] The thickness of the moving magnet 3232 along the first direction is less than the thickness of the fixed magnet 3231 along the first direction. When the vibration system 2 is in the initial position, the repulsive force between the moving magnet 3232 and the fixed connecting magnet 32314 is less than the repulsive force between the moving magnet 3232 and the fixed top magnet 32313, and less than the repulsive force between the moving magnet 3232 and the fixed bottom magnet 32315.

[0071] The moving magnet 3232 is located at the center of the through hole 322; the fixed magnet 3231 includes two, and the two fixed magnets 3231 are arranged at equal intervals around the moving magnet 3232.

[0072] Each fixed magnet 3231 further includes a fixed groove 323141 formed by the fixed connecting magnet 32314 being recessed from the side of the fixed connecting magnet 32314 near the moving magnet 3232 towards the direction away from the moving magnet 3232; the fixed groove 323141 penetrates the fixed connecting magnet 32314 along the second direction; the magnetization directions of the two fixed magnets 3231 are the same and parallel to the third direction; the magnetization direction of the moving magnet 3232 is opposite to the magnetization direction of the fixed magnets 3231.

[0073] The magnetization direction of the fixed magnet 3231 includes the magnetization direction of the fixed top magnet 32313, the magnetization direction of the fixed connecting magnet 32314, and the magnetization direction of the fixed bottom magnet 32315.

[0074] This embodiment only changes the design of the fixed magnet 3231, but it can still achieve the technical effect of the sound-generating device 100 in embodiment five, so it will not be described in detail here.

[0075] The difference between Embodiment 7 and Embodiment 6 is that, as shown in Figure 18, the fixed connecting magnets 32314 in each fixed magnet 3231 are made of non-magnetic materials.

[0076] In each fixed magnet 3231, the magnetization direction of the fixed top magnet 32313 is the same as that of the fixed bottom magnet 32315 and both are parallel to the third direction, while the magnetization direction of the moving magnet 3232 is opposite to that of the fixed top magnet 32313.

[0077] This embodiment only changes the design of the fixed magnet 3231, but it can still achieve the technical effect of the sound-generating device 100 in embodiment six, which will not be elaborated here.

[0078] Of course, the above-mentioned design methods of fixed magnet 3231 and moving magnet 3232 are only some examples. Fixed magnet 3231 and moving magnet 3232 can also be designed in other ways or in multi-layer structures to achieve nonlinearity of repulsion and displacement curves, stiffness and displacement curves. The design method includes a layer structure set according to the requirements of repulsion and displacement relationship. Each layer can be a magnet of any shape, size, magnetization direction, remanence, or magnetic or non-magnetic material, and the position of each layer corresponds to the force.

[0079] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A sound-generating device, comprising a frame, a vibration system fixed to opposite sides of the frame, and a magnetic circuit system, the magnetic circuit system being used to drive the vibration system to vibrate and generate sound; the vibration system comprising a diaphragm fixed to the side of the frame away from the magnetic circuit system and a voice coil fixed to the diaphragm near the magnetic circuit system; the magnetic circuit system comprising magnet assemblies respectively fixed to the side of the frame away from the vibration system and auxiliary magnets arranged around the magnet assemblies and spaced apart to form magnetic gaps; the voice coil being inserted and suspended within the magnetic gaps; the vibration direction of the vibration system being defined as a first direction; characterized in that... The magnet assembly includes a main magnet, a through hole formed through the main magnet along the first direction, and an adjustment assembly located within the through hole; the adjustment assembly includes a moving magnet fixed to the side of the diaphragm near the magnetic circuit system and a fixed magnet fixed to the inner sidewall of the through hole and spaced apart from the moving magnet; the moving magnet always forms a repulsive force with the fixed magnet during its movement stroke.

2. The sound-generating device as described in claim 1, characterized in that, The moving magnet includes a first moving sub-magnet, a second moving sub-magnet, and a third moving sub-magnet connected in sequence along the first direction; when the vibration system is in the initial position, the repulsive force between the second moving sub-magnet and the fixed magnet is less than the repulsive force between the first moving sub-magnet and the fixed magnet, and less than the repulsive force between the third moving sub-magnet and the fixed magnet.

3. The sound-generating device as described in claim 2, characterized in that, The thickness of the moving magnet along the first direction is greater than the thickness of the fixed magnet along the first direction. The orthographic projection of the fixed magnet onto the moving magnet along a third direction completely covers the range of the second moving sub-magnet. The third direction is perpendicular to the first direction.

4. The sound-generating device as described in claim 3, characterized in that, The fixed magnet includes a first fixed sub-magnet fixed to the inner wall of the through hole; the moving magnet also includes a first moving groove formed by the second moving sub-magnet being recessed from the side of the second moving sub-magnet close to the first fixed sub-magnet in a direction away from the first fixed sub-magnet; the first moving groove penetrates the second moving sub-magnet along a second direction; the first direction, the second direction, and the third direction are perpendicular to each other.

5. The sound-generating device as described in claim 4, characterized in that, The magnetization direction of the first fixed sub-magnet is the same as and parallel to the magnetization direction of the moving magnet.

6. The sound-generating device as described in claim 4, characterized in that, The magnetization direction of the first fixed sub-magnet is opposite to and parallel to the magnetization direction of the moving magnet.

7. The sound-generating device as described in claim 4, characterized in that, The moving magnet is located at the center of the through hole; the fixed magnet further includes a second fixed sub-magnet fixed to the inner wall of the through hole, the second fixed sub-magnet and the first fixed sub-magnet being arranged at equal intervals around the moving magnet; the moving magnet further includes a second moving groove formed by a recess along the third direction on the side of the second moving sub-magnet closer to the second fixed sub-magnet; the second moving groove penetrates the second moving sub-magnet along the second direction; the magnetization direction of the first fixed sub-magnet is the same as the magnetization direction of the second fixed sub-magnet and parallel to the third direction, and the magnetization direction of the moving magnet is opposite to the magnetization direction of the first fixed sub-magnet.

8. The sound-generating device as described in claim 3, characterized in that, The fixed magnet includes a first fixed sub-magnet fixed to the inner wall of the through hole; the second moving sub-magnet is made of a non-magnetic material.

9. The sound-generating device as described in claim 8, characterized in that, The first moving sub-magnet and the third moving sub-magnet have the same magnetization direction and are both parallel to the third direction. The magnetization direction of the first fixed sub-magnet is opposite to that of the first moving sub-magnet.

10. The sound-generating device as described in claim 8, characterized in that, The magnetization direction of the first fixed sub-magnet is parallel to the first direction; the magnetization directions of the first moving sub-magnet and the third moving sub-magnet respectively form an angle with the magnetization direction of the first fixed sub-magnet, and the angle is greater than 0° and less than 90°.

11. The sound-generating device as described in claim 8, characterized in that, The moving magnet is located at the center of the through hole; the fixed magnet also includes a second fixed sub-magnet fixed to the inner wall of the through hole, the second fixed sub-magnet and the first fixed sub-magnet are arranged at equal intervals around the moving magnet; the magnetization direction of the second fixed sub-magnet is the same as the magnetization direction of the first fixed sub-magnet and parallel to the third direction, and the magnetization direction of the second fixed sub-magnet is opposite to the magnetization direction of the moving magnet.

12. The sound-generating device as claimed in claim 1, characterized in that, The fixed magnet includes a fixed top magnet and a fixed bottom magnet. The fixed top magnet and the fixed bottom magnet are each fixed to the inner wall of the through hole on the side away from the moving magnet. The fixed top magnet and the fixed bottom magnet are spaced apart along the first direction to form a gap. The orthogonal projection of the moving magnet onto the gap along a third direction completely covers the range of the gap. The third direction is perpendicular to the first direction.

13. The sound-generating device as described in claim 12, characterized in that, The thickness of the moving magnet along the first direction is less than the thickness of the fixed magnet along the first direction; the fixed magnet further includes a fixed connecting magnet fixed between the fixed top magnet and the fixed bottom magnet, and the side of the fixed connecting magnet away from the moving magnet is fixed to the inner wall of the through hole; when the vibration system is in the initial position, the repulsive force between the moving magnet and the fixed connecting magnet is less than the repulsive force between the moving magnet and the fixed top magnet, and less than the repulsive force between the moving magnet and the fixed bottom magnet.

14. The sound-generating device as described in claim 13, characterized in that, The moving magnet is located at the center of the through hole; the fixed magnet includes two fixed magnets, which are arranged at equal intervals around the moving magnet; each fixed magnet also includes a fixing groove formed by the side of the fixed connecting magnet close to the moving magnet and recessed away from the moving magnet; the fixing groove penetrates the fixed connecting magnet along the second direction, and the first direction, the second direction and the third direction are perpendicular to each other; The two fixed magnets are magnetized in the same direction and parallel to the third direction, while the moving magnet is magnetized in the opposite direction to the fixed magnets.

15. The sound-generating device as described in claim 13, characterized in that, The moving magnet is located at the center of the through hole; the fixed magnet includes two fixed magnets, which are arranged at equal intervals around the moving magnet; the fixed connecting magnet in each fixed magnet is made of non-magnetic material; the magnetization direction of the fixed top magnet in each fixed magnet is the same as the magnetization direction of the fixed bottom magnet and is parallel to the third direction, and the magnetization direction of the moving magnet is opposite to the magnetization direction of the fixed top magnet.

16. The sound-generating device as claimed in claim 1, characterized in that, The adjustment assembly further includes an isolation soft magnet sandwiched between the fixed magnet and the inner wall of the through hole, and a central clamping plate sandwiched between the diaphragm and the moving magnet; the fixed magnet is fixed to the inner wall of the through hole by the isolation soft magnet, and the moving magnet is fixed to the diaphragm by the central clamping plate.

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