Magnetic circuit system and sound production device having the same

Abstract

The application belongs to the technical field of loudspeakers, and discloses a magnetic circuit system and a sound generating device with the same, wherein the magnetic circuit system comprises a yoke, a main magnetic assembly, a first auxiliary magnetic assembly and a second auxiliary magnetic assembly arranged on the yoke; the first auxiliary magnetic assembly is located at the outer periphery of the main magnetic assembly; the first auxiliary magnetic assembly and the main magnetic assembly are configured to be magnetized along the vibration direction of the vibration structure; the second auxiliary magnetic assembly is located at the side of the first auxiliary magnetic assembly away from the main magnetic assembly; and the magnetization direction of the second auxiliary magnetic assembly is perpendicular to the magnetization direction of the main magnetic assembly. The magnetic circuit system of the application makes the magnetic induction lines between the second auxiliary magnetic assembly and the first auxiliary magnetic assembly more dense, thereby increasing the magnetic flux, and improving the magnetic induction intensity and the magnetic field utilization rate of the magnetic circuit system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of loudspeakers, in particular to a magnetic circuit system and a sound generating device having the same. BACKGROUND

[0002] The inner space of the vibration structure on the loudspeaker is used as a back cavity, and the back cavity is provided with a voice coil, a magnetic pole piece, a magnet and a yoke.

[0003] In the prior art, in order to obtain greater volume output of the loudspeaker, a magnetic circuit assembly can be added to obtain greater electromagnetic force, for example, the original main magnetic circuit system can be increased to a double magnetic circuit (main magnetic circuit + auxiliary magnetic circuit) structure or a three magnetic circuit (one main magnetic circuit + two auxiliary magnetic circuits) structure, but the total magnetic flux obtained by such a magnetic circuit system is only the superposition of the magnetic fluxes of multiple magnetic circuit assemblies, and the magnetic field utilization rate is not high.

[0004] In addition, when the sound generating device of the prior art works in communication with alternating current, the voice coil will generate an ampere force under the action of the magnetic circuit system, thereby driving the diaphragm of the vibration structure to vibrate and generate sound. At this time, the magnetic circuit system composed of the magnetic pole piece, the magnet and the yoke will be subjected to a reverse force equal in size and opposite in direction to the ampere force received by the voice coil. The reverse force will eventually be transmitted to the shell of the loudspeaker, causing excessive vibration of the shell and damage to the sound quality, affecting the user's experience. SUMMARY

[0005] The purpose of the present application is to provide a magnetic circuit system that can improve the magnetic flux and magnetic field utilization rate of the magnetic circuit system.

[0006] The purpose of the present application is to provide a sound generating device that can further improve the damping performance by setting a magnetic circuit system with high magnetic flux and magnetic field utilization rate.

[0007] To achieve this purpose, the present application adopts the following technical solutions:

[0008] The magnetic circuit system comprises:

[0009] a yoke;

[0010] a main magnetic assembly connected to the yoke;

[0011] a first auxiliary magnetic assembly connected to the yoke, the first auxiliary magnetic assembly being arranged in spaced relation to the main magnetic assembly, the magnetization directions of the first auxiliary magnetic assembly and the main magnetic assembly being configured to be parallel to the vibration direction of the vibration structure, and the magnetization directions of the first auxiliary magnetic assembly and the main magnetic assembly being opposite;

[0012] A second sub-magnetic assembly is connected to the yoke, and is arranged on a side of the first sub-magnetic assembly away from the main magnetic assembly, and a magnetization direction of the second sub-magnetic assembly is perpendicular to a magnetization direction of the main magnetic assembly.

[0013] Preferably, the main magnetic assembly comprises a main magnet arranged on the yoke and a main magnetic pole piece arranged on the main magnet, and the first sub-magnetic assembly comprises a first sub-magnet, and a plurality of the first sub-magnets are arranged in a ring around an outer periphery of the main magnet, and a main magnetic gap is formed between the plurality of first sub-magnets and the main magnet.

[0014] Preferably, the first sub-magnetic assembly further comprises a first sub-magnetic pole piece arranged on the first sub-magnet close to the main magnet.

[0015] Preferably, the second sub-magnetic assembly comprises a second sub-magnet, and each second sub-magnet is arranged on a side of the first sub-magnet away from the main magnet, and a sub-magnetic gap is formed between the first sub-magnet and the second sub-magnet and located at an outer periphery of the main magnetic gap.

[0016] Preferably, the second sub-magnetic assembly further comprises a second sub-magnetic pole piece arranged in the sub-magnetic gap, and a bottom of the second sub-magnetic pole piece is connected to the yoke.

[0017] A sound generating device comprises a magnetic circuit system as described above.

[0018] Preferably, the sound generating device further comprises:

[0019] A housing is formed with a receiving cavity, and the magnetic circuit system is arranged in the receiving cavity.

[0020] A vibrating structure comprises a vibrating diaphragm connected to the housing.

[0021] A voice coil comprises a main voice coil and a sub-voice coil, one end of the main voice coil is connected to the vibrating diaphragm, and the sub-voice coil is connected to the housing, and a current direction in the main voice coil is opposite to a current direction in the sub-voice coil.

[0022] Preferably, the first sub-magnetic assembly of the magnetic circuit system comprises a plurality of first sub-magnetic assemblies, the plurality of first sub-magnetic assemblies are arranged apart from the main magnetic assembly, a main magnetic gap is formed between the first sub-magnets of the plurality of first sub-magnetic assemblies and the main magnet of the main magnetic assembly, and the other end of the main voice coil is suspended in the main magnetic gap.

[0023] As preferred, the auxiliary voice coil is formed as a ring-shaped member, the ring-shaped member comprises a first auxiliary voice coil part relatively close to the main voice coil and a second auxiliary voice coil part relatively far away from the main voice coil, the first auxiliary voice coil part is suspended above the first auxiliary magnet, and the second auxiliary voice coil part is suspended above the second auxiliary magnet of the second auxiliary magnetic assembly.

[0024] As preferred, the second auxiliary magnetic assembly of the magnetic circuit system comprises a plurality of second auxiliary magnetic assemblies, the second auxiliary magnetic assemblies are arranged in one-to-one correspondence with the first auxiliary magnetic assemblies, the second auxiliary magnetic assemblies are located on the side of the first auxiliary magnetic assemblies away from the main magnetic assembly, and the first auxiliary magnet and the second auxiliary magnet are arranged at intervals to form a magnetic gap outside the periphery of the main magnetic gap.

[0025] The beneficial effects of the present application are as follows:

[0026] 1. The magnetic circuit system comprises a yoke and a main magnetic assembly, a first auxiliary magnetic assembly and a second auxiliary magnetic assembly arranged on the yoke, the first auxiliary magnetic assembly is located on the periphery of the main magnetic assembly, the first auxiliary magnetic assembly and the main magnetic assembly are configured to be magnetized along the vibration direction of the vibration structure, the second auxiliary magnetic assembly is located on the side of the first auxiliary magnetic assembly away from the main magnetic assembly, and the magnetization direction of the second auxiliary magnetic assembly is perpendicular to the magnetization direction of the main magnetic assembly. By arranging the magnetization directions of the first auxiliary magnetic assembly and the main magnetic assembly of the magnetic circuit system to be parallel to the vibration direction of the vibration structure, and arranging the magnetization direction of the second auxiliary magnetic assembly to be perpendicular to the magnetization direction of the main magnetic assembly, the magnetic induction lines between the second auxiliary magnetic assembly and the first auxiliary magnetic assembly are more dense, thereby increasing the magnetic flux and improving the magnetic induction intensity and the magnetic field utilization rate of the magnetic circuit system.

[0027] 2. The sound generating device is based on the cooperation of the main magnetic assembly and the main voice coil for sound generating work, the auxiliary magnetic pole structure and the auxiliary voice coil connected to the shell cooperate with each other, and the magnetization directions of the first auxiliary magnetic assembly and the main magnetic assembly are arranged to be along the vibration direction of the vibration structure, and the magnetization directions of the two are opposite to each other, and the current directions in the main voice coil and the current directions in the auxiliary voice coil are opposite to each other, so that the directions of the ampere force received by the main voice coil and the auxiliary voice coil when energized are opposite, thereby playing a role in reducing vibration of the magnetic circuit system and the shell.

[0028] 3. The sound generating device is arranged by the above-mentioned magnetic circuit system, so that the magnetization direction of the second auxiliary magnetic assembly is arranged to be perpendicular to the magnetization direction of the main magnetic assembly, so that the magnetic poles with more dense magnetic induction lines in the second auxiliary magnetic assembly are closer to the path of the auxiliary voice coil when moving, that is, the auxiliary voice coil can pass through more magnetic induction lines when moving, so that the magnetic flux passing through the auxiliary voice coil increases, the interaction force between the magnetic pole structure and the auxiliary voice coil is stronger, the auxiliary voice coil generates a greater counter ampere force, thereby better inhibiting the resonance of the magnetic circuit system, and further improving the vibration reduction effect. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic diagram of a sound production device according to an embodiment of the present application;

[0030] Figure 2 is a structural schematic diagram of a sound production device according to an embodiment of the present application, omitting the housing and the vibrating structure;

[0031] Figure 3 is a cross-sectional view of a sound production device according to an embodiment of the present application;

[0032] Figure 4 is a partial magnetic flux line distribution diagram of a magnetic circuit system according to an embodiment of the present application;

[0033] Figure 5 is a structural schematic diagram of a sound production device according to an embodiment of the present application, omitting the housing, the vibrating structure, and the voice coil;

[0034] Figure 6 is a structural schematic diagram of a sound production device according to an embodiment of the present application, omitting the housing, the vibrating structure, the voice coil, and the auxiliary magnetic pole structure;

[0035] Figure 7 is a cross-sectional view of a sound production device before improvement;

[0036] Figure 8 is a partial magnetic flux line distribution diagram of a magnetic circuit system of a sound production device before improvement.

[0037] In the drawings:

[0038] 1. housing;

[0039] 2. vibrating structure; 21. diaphragm;

[0040] 3. magnetic circuit system; 31. yoke; 32. main magnetic assembly; 321. main magnet; 322. main magnetic pole piece; 33. first auxiliary magnetic assembly; 331. first auxiliary magnet; 332. first auxiliary magnetic pole piece; 34. second auxiliary magnetic assembly; 341. second auxiliary magnet; 342. second auxiliary magnetic pole piece; 35. main magnetic gap; 36. auxiliary magnetic gap;

[0041] 4. voice coil; 41. main voice coil; 41a. first main voice portion; 42. auxiliary voice coil; 42a. first auxiliary voice portion; 42b. second auxiliary voice portion. DETAILED DESCRIPTION

[0042] Embodiments of the present application are described in detail below with reference to the attached drawings, wherein identical or similar components or components having identical or similar functions are denoted by identical reference numerals throughout the several views. The embodiments described below are exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0043] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the description of the present application, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first feature and the second feature are in direct contact, or that the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0045] The technical scheme of the present application will be further illustrated by specific embodiments in conjunction with the drawings.

[0046] As shown in Figures 1-6 , the present application provides a magnetic circuit system 3, comprising a yoke 31, a main magnetic assembly 32, a first auxiliary magnetic assembly 33 and a second auxiliary magnetic assembly 34. Among them, the main magnetic assembly 32 is connected to the yoke 31, the first auxiliary magnetic assembly 33 and the second auxiliary magnetic assembly 34 constitute an auxiliary magnetic pole structure, the first auxiliary magnetic assembly 33 is connected to the yoke 31, the first auxiliary magnetic assembly 33 is arranged apart from the main magnetic assembly 32, the magnetization direction of the first auxiliary magnetic assembly 33 and the main magnetic assembly 32 is parallel to the vibration direction of the vibration structure 2, and the magnetization direction of the first auxiliary magnetic assembly 33 and the main magnetic assembly 32 is opposite, the second auxiliary magnetic assembly 34 is connected to the yoke 31, the second auxiliary magnetic assembly 34 is arranged on the side of the first auxiliary magnetic assembly 33 away from the main magnetic assembly 32, and the magnetization direction of the second auxiliary magnetic assembly 34 is perpendicular to the magnetization direction of the main magnetic assembly 32. That is, as shown in Figure 3 , as a specific embodiment of the present application, the main magnetic assembly 32 and the first auxiliary magnetic assembly 33 are magnetized along the direction parallel to the vibration direction of the vibration structure 2 (corresponding to the up-down direction of Figure 3 ), and the magnetization direction of the main magnetic assembly 32 is opposite to that of the first auxiliary magnetic assembly 33. The magnetic circuit system 3 of the embodiment of the present application can increase the magnetic induction intensity of the magnetic circuit system 3.

[0047] The magnetizing directions of the first auxiliary magnetic assembly 33 and the main magnetic assembly 32 of the magnetic circuit system 3 of the present application are parallel to the vibration direction of the vibration structure 2, and the magnetizing directions of the first auxiliary magnetic assembly 33 and the main magnetic assembly 32 are opposite to each other, and the magnetizing direction of the second auxiliary magnetic assembly 34 is perpendicular to the magnetizing direction of the main magnetic assembly 32, so that the magnetic pole with more dense magnetic induction lines in the second auxiliary magnetic assembly 34 is closer to the path of the movement of the auxiliary voice coil 42 when moving, and the auxiliary voice coil 42 can pass through more magnetic induction lines when moving, thereby increasing the magnetic flux passing through the auxiliary voice coil 42, so as to generate a greater counter-ampere force, which can better suppress the resonance of the magnetic circuit system 3, thereby increasing the magnetic flux passing through the auxiliary voice coil 42, and the interaction force between the magnetic pole structure and the auxiliary voice coil 42 is stronger, and finally the magnetic induction intensity and the magnetic field utilization rate of the magnetic circuit system 3 are improved.

[0048] More specifically, the main magnetic assembly 32 includes a main magnet 321 arranged on the yoke 31 and a main magnetic pole piece 322 arranged on the main magnet 321, and the first auxiliary magnetic assembly 33 includes a first auxiliary magnet 331, and a plurality of first auxiliary magnets 331 are arranged around the outer periphery of the main magnet 321, and a main magnetic gap 35 is formed between the plurality of first auxiliary magnets 331 and the main magnetic assembly 32. That is, as shown in Figure 3 and Figure 5 As shown in the drawings, the main magnet 321 is arranged on the yoke 31, and the yoke 31 can constrain the magnetic field direction of the main magnet 321, thereby preventing magnetic leakage and concentrating magnetic field. Meanwhile, a plurality of first auxiliary magnets 331 can be arranged on the yoke 31 around the outer periphery of the main magnet 321, and the yoke 31 can also constrain the magnetic field direction of the first auxiliary magnet 331, thereby further preventing magnetic leakage and concentrating magnetic field. The main magnet 321 and the first auxiliary magnet 331 are arranged apart to form a main magnetic gap 35, and the main magnetic gap 35 is used to arrange the main voice coil 41, thereby providing space for the movement of the main voice coil 41. The main magnet 321 and the first auxiliary magnet 331 form a main magnetic field acting on the main voice coil 41 to drive the main voice coil 41 to vibrate.

[0049] That is, as shown in Figure 3 the side of the main magnet 321 facing the diaphragm 21 (corresponding to the upper side of Figure 3 ) can be N-pole, and the side away from the diaphragm 21 (corresponding to the lower side of Figure 3 ) is S-pole. Correspondingly, according to the parallel relationship between the magnetizing directions of the first auxiliary magnetic assembly 33 and the main magnetic assembly 32 and the vibration direction of the vibration structure 2, and the opposite relationship between the magnetizing directions of the first auxiliary magnetic assembly 33 and the main magnetic assembly 32, the side of the first auxiliary magnet 331 facing the diaphragm 21 (corresponding to the upper side of Figure 3 ) is S-pole, and the side away from the diaphragm 21 (corresponding to the lower side of Figure 3The bottom of the main magnetic component 35 is the N pole, which, relative to the magnetization direction of the first auxiliary magnetic component 33 and the main magnetic component 32 being the same, can prevent the two from having a blank area in the magnetic field due to the repulsion of the same pole.

[0050] It is worth noting that the above does not restrict the magnetization direction of the main magnet 321 and the first auxiliary magnet 331, as long as the magnetization direction of the main magnet 321 and the first auxiliary magnet 331 are parallel to each other and opposite in orientation.

[0051] In this embodiment, the first auxiliary magnetic assembly 33 further includes a first auxiliary magnetic pole piece 332, which is disposed on the first auxiliary magnet 331 near the main magnet 321. That is, as... Figure 3 and Figure 5 As shown, by placing the first auxiliary magnetic pole piece 332 on the first auxiliary magnet 331 on the side close to the main magnet 321, the first auxiliary magnetic pole piece 332 binds the magnetic field of the first auxiliary magnet 331 around the main magnetic gap 35, constrains the direction of the magnetic field of the first auxiliary magnet 331, and plays the role of preventing magnetic leakage and magnetic concentration, thereby further improving the magnetic field utilization and magnetic flux.

[0052] Specifically, the second auxiliary magnetic assembly 34 includes a second auxiliary magnet 341. Multiple second auxiliary magnetic assemblies 34 are provided, each corresponding one-to-one with a plurality of first auxiliary magnetic assemblies 33. Each second auxiliary magnet 341 is spaced apart and disposed on the side of the first auxiliary magnet 331 away from the main magnet 321. The first auxiliary magnets 331 and the second auxiliary magnets 341 form an auxiliary magnetic gap 36 located on the outer periphery of the main magnetic gap 35. That is, on the side of the first auxiliary magnet 331 away from the main magnet 321 (corresponding to...) Figure 3 A second auxiliary magnet 341 is disposed to the left of the first auxiliary magnet 331 on the left side of the main magnet 35. The first auxiliary magnet 331 and the second auxiliary magnet 341 are spaced apart to form an auxiliary magnetic gap 36. A secondary voice coil 42 is disposed above the secondary magnetic gap 36. Multiple secondary magnetic gaps 36 are correspondingly formed and located on the outer periphery of the main magnetic gap 35. Correspondingly, multiple secondary voice coils 42 are also formed, each corresponding to one of the secondary magnetic gaps 36. Each first auxiliary magnet 331 and a corresponding second auxiliary magnet 341 form an external magnetic field acting on the secondary voice coil 42 to drive the secondary voice coil 42 to vibrate. The direction of the Ampere force on the secondary voice coil 42 is opposite to the direction of the Ampere force on the main voice coil 41. The secondary voice coil 42 is connected to the outer shell 1, thereby reducing the vibration of the outer shell 1 and achieving the effect of vibration reduction.

[0053] Specifically, such as Figure 3 As shown, with Figure 3 Taking the magnetic field direction of the second auxiliary magnet 341 on the left as an example, one side of the second auxiliary magnet 341 on the left (corresponding to Figure 3 The left side) can be, for example, the S pole, then the other side of the second auxiliary magnet 341 on the left (corresponding toFigure 3 The magnetic field direction of the second auxiliary magnet 341 on the right side can be the same as or different from that of the second auxiliary magnet 341 on the left side, which is not limited herein, as long as the magnetization direction of the second auxiliary magnet 341 is perpendicular to the magnetization direction of the main magnet 321 and the first auxiliary magnet 331. Compared with setting the magnetization direction of the second auxiliary magnet 341 to be the same as that of the first auxiliary magnet 331, as shown in FIGS. 1 and 2, i.e., the side of the first auxiliary magnet 331 and the second auxiliary magnet 341 facing the diaphragm 21 (corresponding to the upper side of FIG. 1) is the S pole, and the side of the first auxiliary magnet 331 and the second auxiliary magnet 341 away from the diaphragm 21 (corresponding to the lower side of FIG. 1) is the N pole, the magnetization direction of the second auxiliary magnet 341 in the embodiment of the present application can improve the magnetic field density around the auxiliary gap 36, and further improve the magnetic induction intensity of the external magnetic field. Figure 7 Figure 8 Figure 7 Figure 7

[0054] More specifically, the second auxiliary magnet assembly 34 further comprises a second auxiliary pole piece 342 arranged in the auxiliary gap 36, and the bottom of the second auxiliary pole piece 342 is connected to the yoke 31. That is, as shown in FIGS. 1 and 2, by arranging the second auxiliary pole piece 342 in the auxiliary gap 36 between the first auxiliary magnet 331 and the second auxiliary magnet 341, the second auxiliary pole piece 342 can simultaneously constrain the magnetic field directions of the first auxiliary magnet 331 and the second auxiliary magnet 342, thereby preventing magnetic leakage and concentrating the magnetic field, and further improving the magnetic field utilization rate and the magnetic flux. Figure 3 Figure 4

[0055] The present application further provides a sound generating device, which comprises the magnetic circuit system 3 described above. That is, by arranging the magnetic circuit system 3 described above in the sound generating device, the magnetic induction intensity of the magnetic circuit system 3 can be improved, in particular, the magnetic induction intensity of the external magnetic field can be improved. The increased magnetic induction intensity of the external magnetic field can increase the magnetic flux passing through the auxiliary voice coil 42, increase the Ampere force generated by the auxiliary voice coil 42 when it is electrified, and further improve the damping effect.

[0056] In the embodiment, the sound generating device further comprises a housing 1, a vibration structure 2, a magnetic circuit system 3, and a voice coil 4. The housing 1 is formed with a receiving cavity, the magnetic circuit system 3 is arranged in the receiving cavity, the vibration structure 2 comprises a diaphragm 21, the diaphragm 21 is connected to the housing 1, the voice coil 4 comprises a main voice coil 41 and an auxiliary voice coil 42, one end of the main voice coil 41 is connected to the diaphragm 21, the auxiliary voice coil 42 is connected to the housing 1, and the current direction in the main voice coil 41 is opposite to that in the auxiliary voice coil 42. That is, as shown in FIGS. 1 and 2, the magnetic circuit system 3 comprises a main magnet 321, a first auxiliary magnet 331, and a second auxiliary magnet 341, the main magnet 321 is arranged in the receiving cavity, the first auxiliary magnet 331 is arranged on the diaphragm 21, the second auxiliary magnet 341 is arranged on the diaphragm 21, the main voice coil 41 is arranged on the diaphragm 21, the auxiliary voice coil 42 is arranged on the diaphragm 21, the main voice coil 41 is connected to the diaphragm 21, the auxiliary voice coil 42 is connected to the diaphragm 21, the current direction in the main voice coil 41 is opposite to that in the auxiliary voice coil 42, and the magnetic induction intensity of the external magnetic field can be improved. Figures 1-2 ​​​​​​As shown, the main magnetic assembly 32 and the first auxiliary magnetic assembly 33 form a main magnetic field acting on the main voice coil 41, the main voice coil 41 is energized and vibrates to produce sound under the action of the main magnetic field, since the magnetization directions of the first auxiliary magnetic assembly 33 and the main magnetic assembly 32 are arranged along the vibration direction of the vibration structure 2, and the magnetization directions of the two are opposite to each other, thereby preventing the magnetic field in the main magnetic gap 35 from having a blank area, improving the magnetic field utilization rate of the first auxiliary magnetic assembly 33 and the main magnetic assembly 32, and further improving the sound quality; the second auxiliary magnetic assembly 34 and the first auxiliary magnetic assembly 33 form a secondary magnetic field acting on the secondary voice coil 42, and the secondary voice coil 42 is connected to a current opposite to the current direction of the main voice coil 41. As an example, the main voice coil 41 and the secondary voice coil 42 may, for example, refer to the direction of the arrow shown in FIG. 1, so that the secondary voice coil 42 receives an opposite direction of the ampere force to the main voice coil 41, thereby playing a role in reducing vibration of the magnetic circuit system 3 and the shell 1. Figure 2

[0057] Further, through the above-mentioned magnetic circuit system 3, the magnetization direction of the second auxiliary magnetic assembly 34 is arranged perpendicular to the magnetization direction of the main magnetic assembly 32, so that the magnetic pole with more magnetic induction lines in the second auxiliary magnetic assembly 34 is closer to the path of the secondary voice coil 42 when moving, that is, the secondary voice coil 42 can pass through more magnetic induction lines when moving, so that the magnetic flux passing through the secondary voice coil 42 increases, the interaction force between the magnetic pole structure and the secondary voice coil 42 is stronger, and the secondary voice coil 42 generates a greater reverse ampere force, thereby better inhibiting the resonance of the magnetic circuit system 3, and further improving the damping effect.

[0058] Specifically, the first auxiliary magnetic assembly 33 of the magnetic circuit system 3 includes a plurality of first auxiliary magnetic assemblies 33, which are arranged spaced apart from the main magnetic assembly 32, and a main magnetic gap 35 is formed between the first auxiliary magnet 331 of the plurality of first auxiliary magnetic assemblies 33 and the main magnet 321 of the main magnetic assembly 32, and the other end of the main voice coil 41 is suspended in the main magnetic gap 35. That is, as shown in FIG. 2, a plurality of first auxiliary magnets 331 are arranged around the outer periphery of the main magnet 321, thereby forming a main magnetic field acting on the main voice coil 41, and suspending the main voice coil 41 in a ring-shaped main magnetic gap 35, which can improve the magnetic field utilization rate of the magnetic circuit system 3. Figure 2

[0059] In this embodiment, the secondary voice coil 42 is formed as a ring-shaped member, which includes a first secondary voice coil portion 42a relatively close to the main voice coil 41 and a second secondary voice coil portion 42b relatively far away from the main voice coil 41, the first secondary voice coil portion 42a is suspended above the first auxiliary magnetic assembly 33, and the second secondary voice coil portion 42b is suspended above the second auxiliary magnetic assembly 34. That is, the ring-shaped secondary voice coil 42 is arranged above the auxiliary magnetic assembly, and the auxiliary magnetic assembly acts on the secondary voice coil 42, so that the ampere force received by the secondary voice coil 42 after energization is opposite to the direction of the ampere force received by the main voice coil 41, thereby playing a role in reducing vibration.​​

[0060] It is worth mentioning that the area of the first sub magnetic pole piece 332 of the first sub magnetic assembly 33 is less than or equal to the upper surface area of the first sub magnet 331, in the case that the area of the first sub magnetic pole piece 332 is less than the upper surface area of the first sub magnet 331, the first sub sound part 42a of the sub voice coil 42 can move into the gap formed by the upper surface of the first sub magnet 331 and the first sub magnetic pole piece 332 when moving downward, which can be used to extend the movement path of the sub voice coil 42.

[0061] The force direction of the main voice coil 41 and the sub voice coil 42 will be further described below. From the cross-sectional view, the direction of the magnetic field is as shown in Figure 3 The left sub voice coil 42, the first main sound part 41a close to the sub voice coil 42, the main magnetic assembly 32, the first sub magnetic assembly 33 on the left and the second sub magnetic assembly 34 on the left are taken as objects, under the action of the yoke 31, the main magnetic pole piece 322, the first sub magnetic pole piece 332, the second sub magnetic pole piece 342, the direction of the magnetic field of this part is as shown in Figure 4 The direction of the current of the main voice coil 41 and the sub voice coil 42 is as shown by the arrows in Figure 2 Obviously, as shown in Figure 2 The direction of the current in the first main sound part 41a and the first sub sound part 42a is the same, as shown in Figure 4 The direction of the magnetic induction lines passing through the first main sound part 41a and the first sub sound part 42a is opposite (refer to Figure 4 ), so the direction of the Ampere force received by the first main sound part 41a and the first sub sound part 42a is opposite; obviously, as shown in Figure 2 The direction of the current in the first sub sound part 42a and the second sub sound part 42b is opposite, as shown in Figure 4 The direction of the magnetic induction lines passing through the first main sound part 41a and the first sub sound part 42a is opposite, so the direction of the Ampere force received by the first main sound part 41a and the first sub sound part 42a is the same. That is, under the action of the magnetic circuit system 3 described above, the direction of the Ampere force received by the main voice coil 41 is opposite to the direction of the Ampere force received by the sub voice coil 42, so the sub voice coil 42 transmits the force to the shell 1, which can reduce the vibration of the shell 1 and improve the damping performance.

[0062] More specifically, the second sub magnetic assembly 34 of the magnetic circuit system 3 includes a plurality of, the second sub magnetic assembly 34 is arranged one by one corresponding to the first sub magnetic assembly 33, the second sub magnetic assembly 34 is located on the side away from the main magnetic assembly 32 of the first sub magnetic assembly 33, the first sub magnet 331 of the first sub magnetic assembly 33 and the second sub magnet 341 of the second sub magnetic assembly 34 are arranged apart to form a sub magnetic gap 36 located outside the periphery of the main magnetic gap 35. That is, as shown in Figures 2-4As shown, the second sub-magnetic assembly 34 is arranged on the side of the first sub-magnetic assembly 33 away from the main magnetic assembly 32, and each first sub-magnetic assembly 33 and a corresponding second sub-magnetic assembly 34 form a sub-magnetic field. The sub-magnetic field can include multiple sub-magnetic fields, and the sub-coil 42 can also be arranged in multiple sub-coils, thereby further improving the damping effect of the sound generating device.

[0063] As a preferred embodiment, the main magnet 321 can be arranged at the center of the yoke 31, the first sub-magnet 331 can be arranged in two or more, the number of the first sub-magnet 331 can be even, and the first sub-magnet 331 can be arranged equidistantly on both sides or around the main magnet 321. Further, the second sub-magnet 341 can also be arranged in two or more, the number of the second sub-magnet 341 can be even, and the second sub-magnet 341 can be arranged equidistantly on both sides or around the first sub-magnet 331. The symmetrical arrangement of the magnets ensures the force balance of the magnetic circuit system 3, and can avoid the influence of the deflection and skew of the magnetic circuit system 3 on the sound quality of the loudspeaker. Correspondingly, the main coil 41 can be arranged in one, and the sub-coil 42 can be arranged in two or more, the number of the sub-coil 42 can be even, and then two or four sub-coils 42 can be arranged at the corresponding positions on both ends or around the main coil 41, and the two or four sub-coils 42 are taken as a first sub-coil group. Then, two or four sub-coils 42 are arranged on the outer periphery of the first sub-coil group, and the two or four sub-coils 42 are taken as a second sub-coil group. In this way, at least one sub-coil group can be expanded outward on both ends or around the main coil 41. The at least one sub-coil group cooperates with the symmetrical magnetic circuit system 3 to uniformly apply a reverse ampere force to the magnetic circuit system 3 as a whole, thereby uniformly suppressing the resonance of the magnetic circuit system 3 and further improving the damping effect.

[0064] As an embodiment of the present application, in the resonance frequency band, an alternating voltage of 1V opposite to the power-on direction of the main coil 41 is connected to the two sub-coils 42, at this time, the stress on the shell 1 of the sound generating device in the resonance frequency band will be greatly reduced. In addition, the power-on frequency band and the power-on power of the two sub-coils 42 can be adjusted, and theoretically, the voltage can be continuously increased to reduce the stress on the shell 1 of the sound generating device, thereby achieving the effect of damping in the full frequency band. It should be noted that the power-on voltage can only be within the rated power range of the coil, that is, the voltage cannot be too large to burn the coil.

[0065] Obviously, the above embodiments of the present application are merely example for clearly explaining the present application, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A magnetic circuit system, characterized by, Comprising: a yoke (31); a main magnetic assembly (32) connected to the yoke (31); a first auxiliary magnetic assembly (33) connected to the yoke (31), the first auxiliary magnetic assembly (33) being arranged spaced apart from the main magnetic assembly (32), the magnetization directions of the first auxiliary magnetic assembly (33) and the main magnetic assembly (32) being configured to be parallel to the vibration direction of the vibration structure (2), and the magnetization directions of the first auxiliary magnetic assembly (33) and the main magnetic assembly (32) being opposite; a second auxiliary magnetic assembly (34) connected to the yoke (31), the second auxiliary magnetic assembly (34) being arranged on the side of the first auxiliary magnetic assembly (33) away from the main magnetic assembly (32), the magnetization direction of the second auxiliary magnetic assembly (34) being perpendicular to the magnetization direction of the main magnetic assembly (32); the main magnetic assembly (32) comprises a main magnet (321) arranged on the yoke (31) and a main magnetic pole piece (322) arranged on the main magnet (321), the first auxiliary magnetic assembly (33) comprises a first auxiliary magnet (331), a plurality of the first auxiliary magnets (331) being annularly arranged on the outer periphery of the main magnet (321), and a main magnetic gap (35) being formed between the plurality of the first auxiliary magnets (331) and the main magnet (321); the second auxiliary magnetic assembly (34) comprises a second auxiliary magnet (341), each of the second auxiliary magnets (341) being arranged spaced apart on the side of the first auxiliary magnet (331) away from the main magnet (321), and a secondary magnetic gap (36) being formed between the first auxiliary magnet (331) and the second auxiliary magnet (341) and located on the outer periphery of the main magnetic gap (35); the second auxiliary magnetic assembly (34) further comprises a second auxiliary magnetic pole piece (342) arranged in the secondary magnetic gap (36), and the bottom of the second auxiliary magnetic pole piece (342) is connected to the yoke (31).

2. The magnetic circuit system of claim 1, wherein, The first auxiliary magnetic assembly (33) further comprises a first auxiliary magnetic pole piece (332) arranged on the first auxiliary magnet (331) on the side close to the main magnet (321).

3. Sound production device, characterized in that Comprising: a magnetic circuit system (3) according to any one of claims 1-2.

4. The sound production device of claim 3, wherein, Further comprising: a housing (1) formed with a receiving cavity, the magnetic circuit system (3) being arranged in the receiving cavity; a vibration structure (2) comprising a diaphragm (21), the diaphragm (21) being connected to the housing (1); a voice coil (4) comprising a main voice coil (41) and an auxiliary voice coil (42), one end of the main voice coil (41) being connected to the diaphragm (21), the auxiliary voice coil (42) being connected to the housing (1), and the current direction in the main voice coil (41) being opposite to the current direction in the auxiliary voice coil (42).

5. The sound production device of claim 4, wherein, The first sub-magnetic assembly (33) of the magnetic circuit system (3) comprises a plurality of first sub-magnetic assemblies (33) which are arranged apart from the main magnetic assembly (32), and a main magnetic gap (35) is formed between the first sub-magnetic assembly (33) and the main magnetic assembly (32).

6. The sound production device of claim 5, wherein, The sub-sound coil (42) is formed as a ring-shaped member, which comprises a first sub-sound part (42a) close to the main sound coil (41) and a second sub-sound part (42b) away from the main sound coil (41), the first sub-sound part (42a) is suspended above the first sub-magnetic assembly (331), and the second sub-sound part (42b) is suspended above the second sub-magnetic assembly (34).

7. The sound production device of claim 6, wherein, The second sub-magnetic assembly (34) comprises a plurality of second sub-magnetic assemblies (34) which are arranged one by one corresponding to the first sub-magnetic assembly (33), the second sub-magnetic assembly (34) is located on the side of the first sub-magnetic assembly (33) away from the main magnetic assembly (32), and the first sub-magnetic assembly (331) and the second sub-magnetic assembly (341) are arranged apart to form a sub-magnetic gap (36) located outside the main magnetic gap (35).

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