Loudspeaker and electronic device

Abstract

Embodiments of the present application provide a loudspeaker and an electronic device. The loudspeaker comprises a housing, a magnetic circuit assembly, a diaphragm, and a voice coil. The magnetic circuit assembly is further provided with a gap, and the gap penetrates through a central magnetically conductive member, a central magnet and a lower magnetically conductive member. The loudspeaker further comprises a moving magnetic member and two adjusting members, and the moving magnetic member and the two adjusting members are both located in the gap. The moving magnetic member is fixedly connected to the diaphragm, and the magnetic pole direction of the moving magnetic member is the same as the magnetic pole direction of the central magnet. The adjusting members are soft magnets; the two adjusting members are respectively located on two sides of the moving magnetic member and spaced apart from the moving magnetic member; the two adjusting members are fixed to the lower magnetically conductive member and are a structural member integrally formed with the lower magnetically conductive member; or the two adjusting members are fixed to the central magnetically conductive member and are a structural member integrally formed with the central magnetically conductive member. A negative stiffness mechanism is incorporated in the loudspeaker, which is conductive to improving the low-frequency sensitivity of the loudspeaker, and enhancing the low-frequency effect of the loudspeaker.

Description

Speakers and electronic devices

[0001] This application claims priority to the Chinese patent application with application number 202420169267.2 filed with the State Intellectual Property Office of China on January 23, 2024, and priority to the Chinese patent application with the invention name “Speaker and electronic device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of audio technology, and in particular to a loudspeaker and an electronic device. Background Art

[0003] As portable devices like mobile phones continue to become thinner and smaller, speakers are often smaller due to limited internal space, resulting in smaller back-cavity volumes. The size of a speaker's back-cavity affects the stiffness coefficient of the speaker's vibration system. A smaller back-cavity volume increases the stiffness of the air in the back-cavity, which in turn suppresses the diaphragm's vibrations. This increases the speaker's resonant frequency and reduces its low-frequency performance. Therefore, improving the low-frequency performance of miniaturized speakers has become a current research topic.

[0004] Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a speaker and an electronic device, wherein the speaker has better low-frequency performance.

[0006] In a first aspect, this embodiment provides a loudspeaker. The loudspeaker includes a housing, a magnetic circuit assembly, a diaphragm, and a voice coil. The magnetic circuit assembly is fixedly connected to the housing, a magnetic gap is defined in the magnetic circuit assembly, the diaphragm is fixedly connected to the housing, the diaphragm and the magnetic circuit assembly are disposed opposite each other, and one end of the voice coil is fixedly connected to the diaphragm, with the other end of the voice coil located in the magnetic gap.

[0007] The magnetic circuit assembly includes a central magnet, a central magnetic conductive part and a lower magnetic conductive part. The central magnetic conductive part is fixed to the side of the central magnet facing the diaphragm, and the lower magnetic conductive part is fixed to the side of the central magnet facing away from the diaphragm. The magnetic circuit assembly is also provided with a gap, which is arranged at intervals from the magnetic gap, and the gap passes through the central magnetic conductive part, the central magnet and the lower magnetic conductive part.

[0008] The loudspeaker also includes a moving magnet and two adjusting members, both of which are located in the gap. The moving magnet is fixedly connected to the diaphragm, and the magnetic poles of the end of the moving magnet close to the diaphragm are identical to the magnetic poles of the end of the center magnet close to the diaphragm. The magnetic poles of the end of the moving magnet away from the diaphragm are identical to the magnetic poles of the end of the center magnet away from the diaphragm. The adjusting members are soft magnets, and the two adjusting members are located on either side of the moving magnet and spaced apart from the moving magnet. The two adjusting members are fixed to the lower magnetic conductive member and are integrally formed with the lower magnetic conductive member, or the two adjusting members are fixed to the central magnetic conductive member and are integrally formed with the central magnetic conductive member.

[0009] In this application, because the moving magnet is magnetic and is located in the gap of the central magnetic portion, that is, in the magnetic field of the central magnetic portion, a force is generated between the moving magnet and the central magnetic portion. Since the moving magnet is fixedly connected to the diaphragm, when the voice coil drives the diaphragm to vibrate, the moving magnet vibrates along with the diaphragm. The force between the moving magnet and the central magnetic portion affects the vibration and force of the diaphragm, and the moving magnet can serve as a vibration regulator.

[0010] Furthermore, because the magnetic pole of the moving magnetic element near the diaphragm is identical to the magnetic pole of the central magnetic portion near the diaphragm, and the magnetic pole of the moving magnetic element far from the diaphragm is identical to the magnetic pole of the central magnetic portion far from the diaphragm, the polarity of the moving magnetic element is identical to that of the central magnetic portion. Therefore, when the moving magnetic element moves in the gap, it is repelled by the like-pole magnetic pole of the central magnetic portion. At this point, when the diaphragm deviates from its equilibrium position and vibrates, the moving magnetic element vibrates along with it. The force acting on the moving magnetic element is opposite to the restoring force of the speaker's vibration system, resulting in negative stiffness. The moving magnetic element and the gap form a negative stiffness mechanism, which helps improve the speaker's low-frequency sensitivity and enhance the speaker's low-frequency effect.

[0011] Furthermore, since there is no need to increase the rear cavity space of the speaker when the negative stiffness mechanism is introduced into the speaker, the negative stiffness mechanism of this solution is suitable for miniaturized speaker structures and also contributes to the miniaturized design of the speaker.

[0012] In this embodiment, by providing an adjustment member in the gap, the adjustment member is a soft magnet, and the magnetic field in the gap can be adjusted by the adjustment member, thereby reducing the gradient distribution of the original magnetic field and adjusting the force of the moving magnetic member. By providing two adjustment members on both sides of the moving magnetic member, the balance zone of the moving magnetic member can be expanded and adjusted to obtain a near-zero stiffness zone with a certain height, so that the moving magnetic member can achieve zero stiffness or near-zero stiffness within a small amplitude range corresponding to the near-zero stiffness zone to achieve centering. Wherein, near-zero stiffness includes negative micro-stiffness and positive micro-stiffness.

[0013] At this time, the loudspeaker can form a near-zero stiffness zone and negative stiffness zones on both sides of the near-zero stiffness zone in the gap, so that when the dynamic magnetic part is in the near-zero stiffness zone, that is, within a small amplitude at and near the equilibrium position, zero stiffness or near-zero stiffness is achieved, which is conducive to centering and reducing the risk of instability. The risk of instability is the situation where the diaphragm is sucked to one side under abnormal conditions, such as when the diaphragm is sucked to one side during the assembly process, or when the diaphragm is displaced and sucked to one side under extreme falling impact conditions. Among them, when the dynamic magnetic part has a micro-positive stiffness in the near-zero stiffness zone, it can also play a role in supplementing the gravity of the vibration system to a certain extent. In addition, when the dynamic magnetic part is in the negative stiffness zone, it is still subject to negative stiffness force, which helps to improve the low-frequency performance of the loudspeaker.

[0014] In this embodiment, by providing the adjustment part and the lower magnetic conductive part as an integrally formed structural part, the number of parts of the speaker can be reduced and the structure of the speaker can be simplified, thereby reducing the difficulty of processing caused by the cumulative transmission of the tolerance chain, thereby improving the reliability and consistency of the speaker and enhancing the manufacturability.

[0015] In a possible implementation, the speaker further includes two connecting parts, which are respectively connected between the two adjusting parts and the lower magnetic conductive part. The connecting parts may be soft magnets, and the two adjusting parts, the two connecting parts and the lower magnetic conductive part are an integrally formed structural part.

[0016] In this embodiment, the two connecting members are also located in the gap and are made of soft magnets. Therefore, the connecting members can also adjust the magnetic field within the gap, thereby adjusting the growth rate of the magnetic force / stiffness curve at medium and high amplitudes (corresponding to the negative stiffness region of the gap). In addition, by forming the adjusting member, connecting member, and lower magnetic conductive member into an integrally molded structure, the number of components in the speaker can be reduced, simplifying the speaker structure and reducing the difficulty of manufacturing caused by the cumulative transmission of tolerance chains, thereby improving the reliability and consistency of the speaker and enhancing manufacturability.

[0017] In a possible implementation, the connecting member includes a matching adjustment portion and a transition portion, the matching adjustment portion is connected between the adjusting member and the transition portion, the transition portion is connected to the lower magnetic conductive member, and the transition portion is provided with a curved structure.

[0018] In some examples, the lower magnetic conductive part, the connecting part and the adjusting part can be in a plate-like structure during the processing process. By bending the transition part of the connecting part, the matching adjusting part and the adjusting part are flipped up relative to the lower magnetic conductive part to obtain the final structure of the connecting part and the adjusting part.

[0019] Wherein, in a direction parallel to the diaphragm, the cross-sectional area of ​​the matching adjustment portion is smaller than the cross-sectional area of ​​the adjustment member.

[0020] At this time, the cooperation adjustment part has little influence on the near-zero stiffness zone of the gap, reducing the risk of the near-zero stiffness zone moving downward, which is conducive to the accurate setting of the near-zero stiffness zone and the negative stiffness zone.

[0021] In a possible implementation manner, the lower magnetic conductive member is provided with a plurality of grooves, the plurality of grooves are connected to the gap, and grooves are provided on both sides of each root portion where the transition portion is connected to the lower magnetic conductive member.

[0022] In this embodiment, by providing grooves on both sides of each root of the lower magnetic conductive member connected at the transition portion, the risk of damage such as tearing at the root connection of the connector during the bending process can be reduced, thereby improving product yield and structural reliability.

[0023] In one possible embodiment, the two adjustment members are arranged in a first direction parallel to the diaphragm, and each adjustment member extends in a second direction parallel to the diaphragm and perpendicular to the first direction. The mating adjustment portion includes two connecting segments spaced apart along the second direction and extending perpendicular to the diaphragm. The ends of the connecting segments are respectively fixed to the adjustment member and the transition portion.

[0024] In this embodiment, the adjusting member, the connecting member and part of the structure of the lower magnetic conductive member together form a U-shape, which is conducive to ensuring the structural strength and stability of the adjusting member, and the processing difficulty of the adjusting member and the connecting member is relatively low.

[0025] In a possible implementation, the two adjustment members are arranged in a first direction parallel to the diaphragm, and each adjustment member extends along a second direction parallel to the diaphragm and perpendicular to the first direction.

[0026] In this embodiment, the adjusting member is in the shape of an elongated strip and extends along the length direction of the gap, thereby being able to reasonably control the amplitude of the near-zero stiffness zone of the gap and meet the adjustment requirements of the magnetic field strength of the gap.

[0027] In one possible embodiment, the ratio of the height of the adjusting member in a direction perpendicular to the diaphragm to the width of the adjusting member in the first direction is greater than or equal to 1.5. In this case, the adjusting member can meet the magnetic field adjustment requirements and has high structural reliability.

[0028] In one possible embodiment, in a direction perpendicular to the diaphragm, the height H of the adjusting member, the thickness T of the moving magnetic member, and the total height H0 of the central magnetic conductive member, the central magnet and the lower magnetic conductive member satisfy: 0.5≤H / (0.3*(H0-T))≤1.5.

[0029] In this embodiment, the height center of the adjusting member is generally consistent with the geometric center of the moving magnetic member, including a solution with completely flush height and a solution with nearly flush height. The height dimension of the adjusting member and the range of the near-zero stiffness zone of the gap are ±H nz Positive correlation, by designing 0.5≤H / (0.3*(H0-T))≤1.5, the gap forms a near-zero stiffness zone within 30% of the amplitude of the moving magnet, so that the speaker can better achieve the centering effect of the balanced position.

[0030] In one possible embodiment, the central magnet has a width W0 and a length L0, and the gap includes a first through hole located in the central magnet, the first through hole has a width W and a length L, and satisfies: W*L≤W0*L0 / 9; or, W0 / L0=W / L, and W≤W0 / 3, L≤L0 / 3.

[0031] In this embodiment, by setting the size relationship between the gap and the central magnet, the speaker can take into account both the magnetic force requirement of the moving magnet and the field strength requirement of the magnetic gap of the magnetic circuit assembly.

[0032] In one possible embodiment, the width of the gap between the moving magnet and the adjusting member is greater than or equal to 0.1 mm. In this case, by limiting the gap between the moving magnet and the adjusting member, the speaker can achieve both engineering capabilities and a higher product yield while also increasing the magnetic force generated by the moving magnet.

[0033] In one possible embodiment, the magnetic circuit assembly further includes a side magnet and a side magnetic conductive member, the side magnet is fixed to the lower magnetic conductive member, the side magnet surrounds the center magnet and is spaced apart from the center magnet, the side magnetic conductive member is fixed to the side of the side magnet facing the diaphragm and is spaced apart from the center magnetic conductive member, and the magnetic gap includes a gap between the side magnet and the center magnet and a gap between the side magnetic conductive member and the center magnetic conductive member.

[0034] In one possible embodiment, the moving magnetic element includes a permanent magnet, or at least two permanent magnets, or at least one permanent magnet and at least one soft magnet. In this embodiment, the speaker can adjust the magnetic force or stiffness curve by designing the topology of the moving magnetic element itself.

[0035] In a second aspect, embodiments of the present application provide an electronic device. The electronic device includes a housing and the aforementioned speaker, which is mounted on the housing. In this application, the electronic device includes a speaker with excellent low-frequency performance. The electronic device can emit low-frequency sounds with excellent sound quality through the speaker, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0037] FIG1A is a schematic structural diagram of an electronic device provided in an embodiment of the present application;

[0038] FIG1B is a schematic block diagram of an audio playback process of the electronic device shown in FIG1A in some usage scenarios;

[0039] FIG2 is a schematic structural diagram of the speaker shown in FIG1A in some embodiments;

[0040] FIG3A is a schematic cross-sectional view of the loudspeaker shown in FIG2 taken along line AA;

[0041] FIG3B is a schematic cross-sectional view of the speaker shown in FIG2 taken along line BB;

[0042] FIG4 is a schematic diagram of the exploded structure of the speaker shown in FIG2 ;

[0043] FIG5A is a schematic cross-sectional view of a portion of the structure of the speaker shown in FIG3A ;

[0044] FIG5B is a schematic diagram of the structure shown in FIG5A in other usage scenarios;

[0045] FIG5C is a schematic diagram of the structure shown in FIG5A in yet other usage scenarios;

[0046] FIG6 is a schematic structural diagram of a portion of the structure of the speaker shown in FIG4 ;

[0047] FIG7A is a first magnetic field simulation diagram of the speaker shown in FIG3A without an adjustment member;

[0048] FIG7B is a first magnetic field simulation diagram of the speaker shown in FIG3A provided with an adjustment member;

[0049] FIG7C is a second magnetic field simulation diagram of the speaker shown in FIG3A without an adjustment member;

[0050] FIG7D is a second magnetic field simulation diagram of the speaker shown in FIG3A when an adjustment member is provided;

[0051] FIG8 is a comparison diagram of the force curves of the moving magnetic member of the speaker shown in FIG3A when the adjustment member is provided and when the adjustment member is not provided;

[0052] FIG9 is a schematic structural diagram of a plate for processing the structure shown in FIG6;

[0053] FIG10 is a schematic diagram of a partial structure of the speaker shown in FIG1A in some other embodiments;

[0054] FIG11A is a schematic diagram 1 of the internal structure of a portion of the loudspeaker shown in FIG1A in some other embodiments;

[0055] FIG11B is a second schematic diagram of the internal structure of a portion of the structure of the speaker shown in FIG1A in other embodiments;

[0056] FIG12 is a force curve diagram of the moving magnetic member of the speaker shown in FIG1A in other embodiments;

[0057] FIG13 is a schematic diagram of a partial structure of the speaker shown in FIG1A in some further embodiments;

[0058] FIG14A is a first schematic diagram of the internal structure of a portion of the loudspeaker shown in FIG1A in still other embodiments;

[0059] FIG14B is a second schematic diagram of the internal structure of a portion of the structure of the speaker shown in FIG1A in still other embodiments;

[0060] FIG15 is a force curve diagram of the moving magnetic member of the speaker shown in FIG1A in some other embodiments;

[0061] FIG16 is a schematic diagram of a partial structure of the speaker shown in FIG1A in yet another embodiment;

[0062] FIG17A is a schematic diagram of the internal structure of a portion of the loudspeaker shown in FIG1A in yet another embodiment;

[0063] FIG17B is a second schematic diagram of the internal structure of a portion of the loudspeaker shown in FIG1A in yet another embodiment;

[0064] FIG18 is a force curve diagram of the moving magnetic member of the speaker shown in FIG1A in yet other embodiments;

[0065] FIG19 is a schematic diagram of a partial structure of the speaker shown in FIG1A in still further embodiments;

[0066] FIG20A is a schematic diagram of the internal structure of a portion of the speaker shown in FIG1A in still further embodiments;

[0067] FIG. 20B is a second schematic diagram of the internal structure of a portion of the structure of the speaker shown in FIG. 1A in still further embodiments. DETAILED DESCRIPTION

[0068] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0069] In the description of the embodiments of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed" and "connected" should be understood in a broad sense. For example, "connected" can mean detachably connected or non-detachably connected; it can mean directly connected or indirectly connected through an intermediary. "Multiple" means at least two.

[0070] The directional terms mentioned in the embodiments of the present application, such as "upper", "lower", "inside", "outside", "top", "bottom", "side", etc., are only references to the directions in the drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0071] In the embodiments of the present application, the limitations of the relative position relationship mentioned, such as parallel, perpendicular, aligned, etc., are all for the current state of the art, rather than absolutely strict limitations, and a small amount of deviation is allowed, and it is possible to be approximately parallel, approximately perpendicular, approximately aligned, etc. For example, A and B are parallel, which means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees. For example, A and B are perpendicular, which means that A and B are perpendicular or approximately perpendicular, and the angle between A and B can be between 80 degrees and 100 degrees.

[0072] In the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of the features.

[0073] Please refer to FIG. 1A , which is a schematic structural diagram of an electronic device 100 provided in an embodiment of the present application.

[0074] In some embodiments, the electronic device 100 can be a device with an audio playback function, such as a mobile phone, a tablet computer, a multimedia player, headphones, a speaker, a laptop computer, an in-vehicle device, a foldable terminal device, a television, or a wearable device. Among them, the wearable device can be a smart bracelet, a smart watch, a smart head display, smart glasses, etc. The electronic device 100 of the embodiment shown in Figure 1A is described using a mobile phone as an example. Of course, other types of electronic devices 100 can also adopt similar structures, which will not be described in detail below.

[0075] Exemplarily, the electronic device 100 may include a housing 10, a display screen 20, and a speaker 30. The housing 10 is used to protect the internal electronic components of the electronic device 100. The housing 10 may include a frame 101 and a back cover 102, wherein the frame 101 is connected to the back cover 102 and is arranged around the back cover 102. Exemplarily, the display screen 20 may be fixed to the frame 101. The display screen 20 is arranged opposite to the back cover 102, and the display screen 20 may enclose the interior of the electronic device 100 together with the frame 101 and the back cover 102. The display screen 20 may be a flexible display screen or a rigid display screen. The display screen 20 may be an organic light-emitting diode (OLED) display screen, a mini organic light-emitting diode (MID) display screen, a micro organic light-emitting diode (MID) display screen, a quantum dot light emitting diode (QLED) display screen, a liquid crystal display (LCD), etc.

[0076] The frame 101 may be provided with a sound hole 1011. The number of sound holes 1011 may be one or more. FIG1A illustrates a plurality of sound holes 1011. In other embodiments, the sound hole 1011 may also be provided on the back cover 102, the display screen 20, the connection between the frame 101 and the display screen 20, or the connection between the frame 101 and the back cover 102.

[0077] For example, the speaker 30 can be installed in the housing 10 and located inside the electronic device 100. Figure 1A illustrates the speaker 30 with a dotted line. The speaker 30 can play sound to the outside of the electronic device 100 through the sound outlet 1011.

[0078] Please refer to FIG. 1A and FIG. 1B in combination. FIG. 1B is a schematic block diagram of an audio playback process of the electronic device 100 shown in FIG. 1A in some usage scenarios.

[0079] In some embodiments, the audio playback process of the speaker 30 may be as follows: the electronic device 100 decodes the audio file into a digital signal, performs digital-to-analog conversion on the digital signal to restore it to an analog signal, then amplifies the analog signal and inputs it to the speaker 30, which then plays the audio. After the voice coil of the speaker 30 receives the current signal, the energized voice coil vibrates magnetically in the magnetic field of the magnetic circuit assembly of the speaker 30, thereby driving the diaphragm to vibrate and produce sound.

[0080] In other embodiments, the electronic device 100 may further include a plurality of speakers 30 , and the plurality of speakers 30 may be used to emit sounds of a plurality of audio tracks to form stereo sound.

[0081] It should be noted that FIG1A only schematically illustrates some components of the electronic device 100, and the actual shapes and sizes of these components are not limited by FIG1A or the following figures. It should be understood that when the electronic device 100 has other forms, the electronic device 100 may not include the display screen 20, or the electronic device 100 may include multiple display screens 20.

[0082] The above specifically introduces the relevant configuration of the speaker 30 in the electronic device 100. The following will introduce the specific structure of the speaker 30 in conjunction with the relevant drawings.

[0083] Please refer to Figures 2 to 4 in combination. Figure 2 is a structural schematic diagram of the speaker 30 shown in Figure 1A in some embodiments, Figure 3A is a cross-sectional structural schematic diagram of the speaker 30 shown in Figure 2 taken along AA, Figure 3B is a cross-sectional structural schematic diagram of the speaker 30 shown in Figure 2 taken along BB, and Figure 4 is a decomposed structural schematic diagram of the speaker 30 shown in Figure 2.

[0084] In some embodiments, a loudspeaker 30 may include a housing 1, a diaphragm 2, a magnetic circuit assembly 3, a voice coil 41, a voice coil connector 42, a centering support 51, a surround 52, a moving magnet 6, and a connecting bracket 7. For ease of description, the loudspeaker 30 is defined as having a length direction X, a width direction Y, and a thickness direction Z, with these directions arranged perpendicularly to each other. The loudspeaker 30 and its components or structures are defined with the side closest to the diaphragm 2 as the "top" and the side farther from the diaphragm 2 as the "bottom."

[0085] For example, the housing 1 may be roughly frame-shaped. For example, the housing 1 may be a rectangular frame with a hollowed-out center. In some examples, the housing 1 may also be referred to as a frame. In other embodiments, the housing 1 may also be a frame of other shapes, such as a circular frame, etc., which is not strictly limited in the present embodiment.

[0086] Exemplarily, the diaphragm 2 is fixedly connected to the shell 1. The diaphragm 2 may include a vibration portion 21, a folding ring portion 22 and a fixing portion 23. The folding ring portion 22 surrounds the outer peripheral side of the vibration portion 21 and is connected to the vibration portion 21. The fixing portion 23 surrounds the outer peripheral side of the folding ring portion 22 and is connected to the folding ring portion 22. The fixing portion 23 may be fixedly connected to the top side of the shell 1, and the folding ring portion 22 and the vibration portion 21 correspond to the middle hollow position of the shell 1. The thickness direction Z of the speaker may be perpendicular to the diaphragm 2, and the length direction X and width direction Y of the speaker may be parallel to the diaphragm 2. In the embodiment of the present application, the relative positional relationship between a certain structure or design and the diaphragm 2 (for example, parallel, perpendicular, etc.) is mainly based on the vibration portion 21 of the reference diaphragm 2.

[0087] Exemplarily, the magnetic circuit assembly 3 is fixedly connected to the housing 1 and disposed opposite the diaphragm 2, with a gap formed between the magnetic circuit assembly 3 and the vibrating portion 21 and the folding ring portion 22 of the diaphragm 2. The magnetic circuit assembly 3 includes a magnetic gap 3a and an air gap 3b, with the air gap 3b spaced apart from the magnetic gap 3a. The air gap 3b may be located inside the magnetic gap 3a.

[0088] In some examples, the magnetic circuit assembly 3 may include a central magnet 31 , side magnets 32 , a central magnetic conductive member 33 , side magnetic conductive members 34 , and a lower magnetic conductive member 35 .

[0089] The central magnet 31 may be substantially rectangular and may have a first through hole 311 in the middle thereof, the first through hole 311 forming a part of the gap 3b.

[0090] The side magnets 32 surround the center magnet 31 and are spaced apart from the center magnet 31. For example, the side magnets 32 may include four magnets, which are arranged around the center magnet 31 and are spaced apart from the center magnet 31. In other embodiments, the side magnets 32 may also be annular magnets, which is not strictly limited in the embodiments of the present application. The gap between the side magnets 32 and the center magnet 31 is part of the magnetic gap 3a, that is, the magnetic gap 3a includes the gap between the side magnets 32 and the center magnet 31.

[0091] The central magnetic member 33 is fixed to the side of the central magnet 31 facing the diaphragm 2. The central magnetic member 33 is spaced apart from and opposite the vibrating portion 21 of the diaphragm 2. A second through-hole 331 may be provided in the middle of the central magnetic member 33. The second through-hole 331 communicates with the first through-hole 311 and forms another portion of the gap 3b. The central magnetic member 33 may be made of a magnetically conductive material.

[0092] The side magnetic conductive member 34 is fixed to the side of the side magnet 32 ​​facing the diaphragm 2 and is spaced apart from the central magnetic conductive member 33. The side magnetic conductive member 34 is spaced apart from and opposite to the folding ring portion 22 of the diaphragm 2. The side magnetic conductive member 34 can be fixedly connected to the housing 1. The side magnetic conductive member 34 can include four magnetic conductive portions 341 and a connecting frame 342. Two of the four magnetic conductive portions 341 are positioned opposite each other, and the other two are positioned opposite each other. The connecting frame 342 surrounds the outer periphery of the four magnetic conductive portions 341 and fixedly connects the four magnetic conductive portions 341. The four magnetic conductive portions 341 are respectively located on the top sides of the four magnets of the side magnet 32. The side magnetic conductive member 34 can be made of a magnetic conductive material. The gap between the side magnetic conductive member 34 and the central magnetic conductive member 33 forms another portion of the magnetic gap 3a. That is, the magnetic gap 3a also includes the gap between the side magnetic conductive member 34 and the central magnetic conductive member 33.

[0093] The lower magnetic conductive member 35 is fixed to the side of the central magnet 31 facing away from the central magnetic conductive member 33. The side magnet 32 ​​is fixed to the lower magnetic conductive member 35. The lower magnetic conductive member 35 can be made of a magnetic conductive material. The lower magnetic conductive member 35 can be provided with a third through hole 351, which is connected to the first through hole 311, and the third through hole 351 forms another part of the gap 3b. In this case, the gap 3b can pass through the central magnetic conductive member 33, the central magnet 31 and the lower magnetic conductive member 35. In this case, the speaker 30 fully utilizes the thickness of its magnetic circuit component 3 to arrange the gap 3b, which is conducive to the miniaturization of the speaker 30.

[0094] The lower magnetic conductive member 35 may have a plurality of avoidance gaps 352 , which are located at four corners of the lower magnetic conductive member 35 . The avoidance gaps 352 are arranged corresponding to the spaces between two adjacent magnets in the side magnets 32 .

[0095] Exemplarily, the voice coil 41 is located between the diaphragm 2 and the magnetic circuit assembly 3. One end of the voice coil 41 is fixedly connected to the diaphragm 2, and the other end of the voice coil 41 is located in the magnetic gap 3a. The voice coil 41 can be connected to the vibrating portion 21 of the diaphragm 2. The voice coil 41 can be fixedly connected to the diaphragm 2 via a voice coil connecting frame 42 to better meet its position arrangement requirements. The voice coil connecting frame 42 can be frame-shaped, so that the voice coil 41 can be evenly connected to the diaphragm 2 along the circumference of the voice coil 41.

[0096] In this embodiment, when power is supplied to the voice coil 41, it generates a force within the magnetic field of the magnetic circuit assembly 3, thereby driving the diaphragm 2 to vibrate, thereby enabling the speaker 30 to produce sound. The voice coil 41 can receive an alternating signal and generate an alternating force within the magnetic field. The direction in which the voice coil 41 drives the diaphragm 2 to vibrate is along the axial direction of the voice coil 41, and the vibration direction of the diaphragm 2 is generally perpendicular to the diaphragm 2 itself.

[0097] Exemplarily, the centering support 51 can be connected between the voice coil 41 and the side magnetic member 34. For example, the centering support 51 can include four parts, one end of each of the four parts is fixed to the bottom of the four corners of the side magnetic member 34, and the other end is fixed to the four corners of the voice coil 41. The centering support 51 can be arranged corresponding to the space between two adjacent magnets in the side magnet 32. In some other embodiments, the centering support 51 can also be connected between the voice coil 41 and the housing 1. In other embodiments, the speaker 30 can also be provided with no centering support 51.

[0098] Exemplarily, the folding ring 52 can be connected between the voice coil 41 and the side magnetic member 34. For example, the folding ring 52 can be located on the side of the centering support 51 facing away from the side magnetic member 34. The folding ring 52 can include four parts, which are arranged in a one-to-one correspondence with the four parts of the centering support 51, and each end of the folding ring 52 is respectively fixed to the two ends of a part of the centering support 51. The folding ring 52 can include a folding ring portion, and the folding ring portion can protrude toward the side away from the centering support 51. In other embodiments, the speaker 30 can also be provided with a folding ring 52.

[0099] Exemplarily, the dynamic magnetic member 6 is located in the gap 3b of the magnetic circuit assembly 3. The dynamic magnetic member 6 can be fixedly connected to the diaphragm 2, for example, by a connecting bracket 7. One end of the connecting bracket 7 can be fixedly connected to the diaphragm 2, and the dynamic magnetic member 6 can be embedded in the other end of the connecting bracket 7. The middle portion of the connecting bracket 7 can be provided with a hollow area to reduce the mass of the connecting bracket 7 and reduce the power consumption of the speaker 30.

[0100] In this embodiment, the dynamic magnetic member 6 is magnetic. Since the dynamic magnetic member 6 is located in the gap 3b, and the gap 3b passes through the central magnetic conductive member 33, the central magnet 31, and the lower magnetic conductive member 35, the gap 3b is located in the magnetic field of the central magnet 31. Therefore, a force is generated between the dynamic magnetic member 6 and the magnetic field of the central magnet 31. Since the dynamic magnetic member 6 is fixedly connected to the diaphragm 2, when the voice coil 41 drives the diaphragm 2 to vibrate, the dynamic magnetic member 6 vibrates along with the diaphragm 2. The force between the dynamic magnetic member 6 and the magnetic field of the central magnet 31 affects the vibration and force of the diaphragm 2, and the dynamic magnetic member 6 can serve as a vibration regulator.

[0101] In a typical loudspeaker, the vibrating parts, such as the diaphragm, belong to the vibration system, while the parts supporting the diaphragm, such as the surround, belong to the support system. By analyzing the forces acting on the diaphragm, we can derive its vibration equation:

[0102] The mass of the vibrating parts of the vibration system and the equivalent acoustic mass generated by the reaction of acoustic radiation are collectively referred to as the vibration mass Mms of the loudspeaker. When the diaphragm vibrates up and down off-center, the support system provides an elastic restoring force. This force changes with the deviation position, and its stiffness coefficient Kms can be obtained. The stiffness coefficient Kms and the vibration mass Mms determine the first-order resonant frequency of the loudspeaker vibration system, which is defined as:

[0103] As the formula shows, a smaller stiffness coefficient Kms and a larger vibrating mass Mms help lower the first-order resonant frequency fs, allowing speaker 30 to achieve better low-frequency sound output. The stiffness coefficient Kms of a speaker system is determined in part by the size of the system's rear cavity, namely the air stiffness Ka, and in part by the stiffness Ks of the surround or other supporting components, which in turn is related to the material's Young's modulus, thickness, and structural design. The stiffness coefficient Kms satisfies the following equation: Kms = Ka + Ks.

[0104] Currently, traditional methods for reducing the stiffness coefficient Kms have reached a bottleneck. Due to the miniaturization of end products, the rear cavity of the speaker is becoming smaller and smaller, making it difficult to further reduce the air stiffness Ka. Furthermore, due to material technology constraints, further reduction of the stiffness Ks of the supporting components will lead to a series of reliability and nonlinear issues, making it difficult to support the low-frequency requirements of the speaker in the end product. Therefore, it is necessary to introduce new mechanisms from other angles to reduce the system stiffness coefficient Kms or reduce the elastic restoring force of the supporting system and air, thereby improving low-frequency sound output.

[0105] Theoretically, by setting up a certain mechanism, another force is introduced to offset the restoring force (for example, in the opposite direction), and this force varies with the degree to which the diaphragm deviates from the center position. This can achieve the effect of reducing the stiffness of the system, thereby reducing fs and improving low-frequency sound output.

[0106] As deduced from the above formula, the system stiffness K is equal to the original support stiffness Kms minus the stiffness Kb generated by the new mechanism. Kb can be called negative stiffness, and the mechanism that generates Kb is called a negative stiffness mechanism.

[0107] Please refer to Figure 3A again. In the embodiment of the present application, the central magnetic conductive part 33, the central magnet 31 and the lower magnetic conductive part of the magnetic circuit assembly 3 are jointly provided with a gap 3b, and the dynamic magnetic part 6 connected to the diaphragm 2 is located in the gap 3b. The speaker 30 sets the magnetic pole relationship between the central magnet 31 and the dynamic magnetic part 6. During the vibration of the diaphragm 2, the magnetic field of the central magnet 31 can form a repulsive force on the dynamic magnetic part 6, and the direction of the repulsive force is opposite to the reset direction of the diaphragm 2 (that is, the direction in which the diaphragm 2 returns to the equilibrium position from the current position). Therefore, a stiffness adjustment mechanism is introduced into the speaker 30, and it is a negative stiffness mechanism, which is beneficial to reduce the first-order resonant frequency of the speaker 30, improve the low-frequency sensitivity of the speaker 30, and achieve enhanced low-frequency effect of the speaker 30.

[0108] Please refer to Figure 3A, Figure 5A to Figure 5C. Figure 5A is a schematic cross-sectional diagram of a partial structure of the speaker 30 shown in Figure 3A, Figure 5B is a schematic diagram of the structure shown in Figure 5A in other usage scenarios, and Figure 5C is a schematic diagram of the structure shown in Figure 5A in yet other usage scenarios.

[0109] In some embodiments, the polarity direction of the center magnet 31 can be set along the thickness direction Z of the speaker 30. In the embodiment of the present application, the magnetic part has two poles, namely the north pole (N pole) and the south pole (S pole), and the magnetic pole direction of the magnetic part can be understood as the direction from the N pole to the S pole. For example, the magnetic pole of the end of the center magnet 31 close to the diaphragm 2 can be the N pole, and the magnetic pole of the end of the center magnet 31 away from the diaphragm 2 can be the S pole. Then the magnetic pole direction of the center magnet 31 is perpendicular to the diaphragm 2. In other embodiments, the magnetic pole of the end of the center magnet 31 close to the diaphragm 2 can be the S pole, and the magnetic pole of the end of the center magnet 31 away from the diaphragm 2 can be the N pole.

[0110] Among them, the magnetic pole of the end of the moving magnetic part 6 close to the diaphragm 2 is the same as the magnetic pole of the end of the center magnet 31 close to the diaphragm 2. The magnetic pole of the end of the moving magnetic part 6 away from the diaphragm 2 is the same as the magnetic pole of the end of the center magnet 31 away from the diaphragm 2. At this time, the direction of the magnetic pole of the moving magnetic part 6 is the same as the direction of the magnetic pole of the center magnet 31. When the moving magnetic part 6 moves in the gap 3b, it is subject to the repulsive effect of the like magnetic pole of the center magnet 31. When the diaphragm 2 deviates from the equilibrium position and vibrates, the moving magnetic part 6 vibrates together. The force acting on the moving magnetic part 6 is opposite to the direction of the restoring force of the vibration system of the loudspeaker 30 itself, forming a negative stiffness. The moving magnetic part 6 and the gap 3b form a negative stiffness mechanism, which is beneficial to improving the low-frequency sensitivity of the loudspeaker 30 and achieving an enhanced low-frequency effect of the loudspeaker 30. In addition, since the speaker 30 does not need to increase the back cavity space of the loudspeaker 30 when the above-mentioned negative stiffness mechanism is introduced, the negative stiffness mechanism of this scheme is suitable for miniaturized loudspeaker structures and also contributes to the miniaturized design of the loudspeaker.

[0111] Specifically, when the dynamic magnetic part 6 is located in the gap 3b of the magnetic circuit assembly 3, due to the distribution gradient of the magnetic field in the gap 3b, there is a difference in the magnetic field at the upper surface, lower surface and upper and lower parts of the side, thereby forming a difference in the thickness direction Z of the speaker 30. The integral of the magnetic field at the boundary area of ​​the dynamic magnetic part 6 can be used to calculate the resultant magnetic force exerted on the dynamic magnetic part 6, which is comprehensively expressed as a repulsive force. In Figures 5A to 5C, for the sake of convenience, F1 represents the repulsive force of the N pole, and F2 represents the repulsive force of the S pole. Among them, when the diaphragm 2 (see Figure 3A) is in an equilibrium position, as shown in Figure 5A, the dynamic magnetic part 6 is also in an equilibrium position, F1 and F2 are equal or close, and the resultant force is 0 or near zero. At this time, the dynamic magnetic part 6 is at zero stiffness or near-zero stiffness, achieving a centering effect. When the diaphragm 2 (see FIG. 3A ) vibrates upward from its equilibrium position, as shown in FIG. 5B , the dynamic magnet 6 also vibrates upward from its equilibrium position, F1 is less than F2, and the resultant force F is an upward force. At this time, the direction of the resultant force F is away from the equilibrium position. The direction of F is consistent with the direction of motion of the diaphragm 2 and the dynamic magnet 6, and is opposite to the direction of the restoring force of the vibration system of the loudspeaker 30, forming a negative stiffness force. When the diaphragm 2 (see FIG. 3A ) vibrates downward from its equilibrium position, as shown in FIG. 5C , the dynamic magnet 6 also vibrates downward from its equilibrium position, F1 is greater than F2, and the resultant force F is a downward force. At this time, the direction of the resultant force F is away from the equilibrium position. The direction of F is consistent with the direction of motion of the diaphragm 2 and the dynamic magnet 6, and is opposite to the direction of the restoring force of the vibration system of the loudspeaker 30, forming a negative stiffness force.

[0112] Please continue to refer to Figure 5A. In some embodiments, in the width direction X and the length direction Y of the speaker 30, the geometric center of the dynamic magnetic element 6 is located in the middle of the gap 3b, so that the force acting on the dynamic magnetic element 6 in the width direction X and the length direction Y of the speaker 30 is zero, while the dynamic magnetic element 6 is subjected to the resultant force in the stiffness direction Z of the speaker 30, thereby reducing the risk of the dynamic magnetic element 6 causing the diaphragm 2 to be polarized and improving the movement reliability of the dynamic magnetic element 6.

[0113] In some embodiments, the magnetic circuit assembly 3 can be a symmetrical structure relative to the gap 3b, including symmetry in the width direction X of the speaker 30 and symmetry in the length direction Y of the speaker 30, so that the force applied to the moving magnetic component 6 when moving in the gap 3b can be balanced in the width direction X and the length direction Y of the speaker 30, thereby reducing the risk of polarization of the diaphragm 2 caused by the force of the moving magnetic component 6.

[0114] In some embodiments, the combined structure of the central magnetic conductive member 33, the central magnet 31, and the lower magnetic conductive member 35 has a first height center in a direction perpendicular to the diaphragm 2. When the moving magnetic member 6 is in the equilibrium position, the geometric center of the moving magnetic member 6 is aligned with the first height center. In this case, when the moving magnetic member 6 is in the equilibrium position, the magnetic fields on the upper and lower sides of the moving magnetic member 6 are more symmetrical, and the net force acting on the moving magnetic member 6 is zero or extremely small, which facilitates centering of the diaphragm 2 at the equilibrium position.

[0115] In other embodiments, when the moving magnetic member 6 is in the equilibrium position, in a direction perpendicular to the diaphragm 2, a first distance is formed between the geometric center of the moving magnetic member 6 and the center of the first height, and the ratio of the first distance to the total height of the central magnetic conductive member 33, the central magnet 31, and the lower magnetic conductive member 35 is less than or equal to 15%. In this case, when the moving magnetic member 6 is in the equilibrium position, the upper and lower magnetic fields of the moving magnetic member 6 still have good symmetry, and the net force acting on the moving magnetic member 6 is zero or near zero, which facilitates centering of the diaphragm 2 at the equilibrium position.

[0116] In some embodiments, when the moving magnetic member 6 deviates from the equilibrium position and moves downward, its range of movement does not exceed the bottom surface of the lower magnetic conductive member 35; when the moving magnetic member 6 deviates from the equilibrium position and moves upward, its range of movement does not exceed the top surface of the central magnetic conductive member 33. In the thickness direction Z of the loudspeaker 30, the total height of the central magnetic conductive member 33, the central magnet 31, and the lower magnetic conductive member 35 is H0, the thickness of the moving magnetic member 6 is T, the amplitude of the upward movement of the moving magnetic member 6 is (H0-T) / 2, and the amplitude of the downward movement of the moving magnetic member 6 is -(H0-T) / 2.

[0117] In other embodiments, when the moving magnetic member 6 deviates from the equilibrium position and moves upward, its range of movement may also slightly exceed the top surface of the central magnetic conductive member 33, so that the range of movement of it and its attached linkage device is below the diaphragm 2 of the speaker 30.

[0118] In some embodiments, the dimensions of gap 3b include height, width, and length. The cross-sectional shape and dimensions of gap 3b can vary or remain constant along the thickness direction Z of speaker 30. For example, referring to FIG4 and FIG5A , gap 3b includes a first through-hole 311 located in center magnet 31, a second through-hole 331 located in center magnetic conductive member 33, and a third through-hole 351 located in lower magnetic conductive member 35. The shapes of first through-hole 311, second through-hole 331, and third through-hole 351 can be the same or different, and their dimensions can be the same or different.

[0119] The height of gap 3b is determined by the thickness of moving magnet 6 and the vibration range of moving magnet 6. The minimum width and length of gap 3b are determined by the magnetic force range required to be generated by moving magnet 6. The larger the width and length of gap 3b, the larger the structure of moving magnet 6 can be, resulting in a stronger magnetic force. The maximum width and length of gap 3b are determined by the acceptable attenuation of the field strength of magnetic gap 3a within voice coil 41 or the magnetic force factor Bl of voice coil 41. In this embodiment, the attenuation amplitude is set to be less than 10%, which means that the field strength of magnetic gap 3a needs to be maintained at 0.9*Bl.

[0120] Exemplarily, the central magnet 31 has a width W0 and a length L0, and the first through hole 311 has a width W and a length L, satisfying the following conditions: W*L≤W0*L0 / 9; or, W0 / L0=W / L, with W≤W0 / 3 and L≤L0 / 3. Width W0 and width W represent the dimensions of the speaker 30 in the width direction X, while length L0 and length L represent the dimensions of the speaker 30 in the length direction Y.

[0121] In this embodiment, by setting the size relationship between the first through hole 311 and the central magnet 31 , the speaker 30 can take into account both the magnetic force requirements of the moving magnet 6 and the field strength requirements of the magnetic gap 3 a of the magnetic circuit assembly 3 .

[0122] In some embodiments, when the size of the first through hole 311 is determined, the larger the size of the moving magnetic part 6, the greater the magnetic force generally generated. The height of the moving magnetic part 6 is determined by the required range of motion and the anti-demagnetization ability of the magnet. The greater the thickness of the moving magnetic part 6, the stronger the anti-demagnetization ability. In this embodiment, the range of magnetic force can be adjusted by adjusting the volume of the moving magnetic part 6. The maximum value of the width of the moving magnetic part 6 is also affected by the minimum gap between the moving magnetic part 6 and the center magnet 31. Generally, the smaller the gap, the greater the magnetic force. The minimum value of the gap depends on engineering capabilities, such as dimensional tolerance, position tolerance, etc. The maximum value of the gap is affected by the system size and design and can be flexibly adjusted.

[0123] In some embodiments of the present application, the speaker 30 can also add other magnetic parts or magnetic components so that the dynamic magnetic part 6 can achieve near-zero stiffness centering (slightly positive stiffness or slightly negative stiffness) within a small amplitude close to the equilibrium position, and achieve negative stiffness at medium and large amplitudes.

[0124] The following are examples.

[0125] Please refer to FIG. 4 and FIG. 6 . FIG. 6 is a schematic structural diagram of a portion of the structure of the speaker 30 shown in FIG. 4 .

[0126] In some embodiments, the speaker 30 may further include two adjusting members 8 and two connecting members 9. The two adjusting members 8 are spaced apart, and the two connecting members 9 are respectively connected between the two adjusting members 8 and the lower magnetic conductive member 35. For example, one end of the connecting member 9 may be connected to the bottom of the adjusting member 8, and the other end of the connecting member 9 may be connected to the wall of the third through hole 351. The two connecting members 9 are respectively connected to two oppositely disposed walls of the third through hole 351. In this case, the two adjusting members 8 are fixed relative to the lower magnetic conductive member 35.

[0127] In this embodiment, the adjusting member 8 is fixedly connected to the lower magnetic conductive member 35 through the connecting member 9, which can increase the connection stability between the adjusting member 8 and the lower magnetic conductive member 35, reduce the risk of preventing the adjusting member 8 from shifting, and improve the structural reliability of the speaker 30.

[0128] Please refer to Figure 5A again. In some embodiments, two adjusting members 8 are located in the gap 3b. The two adjusting members 8 are respectively located on both sides of the moving magnetic member 6 and are spaced apart from the moving magnetic member 6. At this time, the moving magnetic member 6 is in a balanced position. The adjusting members 8 can be soft magnets. The soft magnets are made of magnetic materials with low coercive force and high magnetic permeability, such as silicon steel or generally used cold-rolled carbon steel sheets and steel strips (SPCC). Soft magnets are easy to magnetize and also easy to demagnetize.

[0129] In this embodiment, by providing an adjustment member 8 in the gap 3b, the adjustment member 8 is a soft magnet, and the magnetic field in the gap 3b can be adjusted by the adjustment member 8, thereby reducing the gradient distribution of the original magnetic field and adjusting the force of the dynamic magnetic member 6. By providing two adjustment members 8 on both sides of the dynamic magnetic member 6, the balance zone of the dynamic magnetic member 6 can be expanded and adjusted to obtain a near-zero stiffness zone with a certain height, so that the dynamic magnetic member 6 can achieve zero stiffness or near-zero stiffness within a small amplitude range corresponding to the near-zero stiffness zone to achieve centering. Wherein, the near-zero stiffness includes negative micro-stiffness and positive micro-stiffness.

[0130] At this time, the loudspeaker 30 can form a near-zero stiffness zone and negative stiffness zones on both sides of the near-zero stiffness zone in the gap 3b, so that when the dynamic magnetic part 6 is located in the near-zero stiffness zone, that is, within a small amplitude at and near the equilibrium position, zero stiffness or near-zero stiffness is achieved, which is conducive to centering and reducing the risk of instability. The risk of instability is the situation where the diaphragm 2 is sucked to one side under an abnormal state, such as the situation where the diaphragm 2 is sucked to one side during the assembly process, or the situation where the diaphragm 2 is displaced and sucked to one side under extreme falling impact. Among them, when the dynamic magnetic part 6 has a slightly positive stiffness in the near-zero stiffness zone, it can also play a role in supplementing the gravity of the vibration system to a certain extent. In addition, when the dynamic magnetic part 6 is located in the negative stiffness zone, it is still subject to negative stiffness force, which helps to improve the low-frequency performance of the loudspeaker 30.

[0131] Please refer to Figures 7A to 7D in conjunction with Figure 7A. Figure 7A is a first magnetic field simulation diagram of the speaker 30 shown in Figure 3A without the adjustment member 8. Figure 7B is a first magnetic field simulation diagram of the speaker 30 shown in Figure 3A with the adjustment member 8. Figure 7C is a second magnetic field simulation diagram of the speaker 30 shown in Figure 3A without the adjustment member 8. Figure 7D is a second magnetic field simulation diagram of the speaker 30 shown in Figure 3A with the adjustment member 8. The magnetic fields in Figures 7A and 7B do not include the magnetic field of the moving magnetic member 6, while the magnetic fields in Figures 7C and 7D include the magnetic field of the moving magnetic member 6. In Figures 7A to 7D, the lighter the color of a region in the gap 3b, the stronger the magnetic field.

[0132] 7A and 7B , when the moving magnetic member 6 deviates from the equilibrium position and vibrates upward by a small amplitude, the difference in magnetic fields between the upper and lower sides of the moving magnetic member 6 is reduced in the solution in which the speaker 30 is provided with an adjustment member 8 (as shown in FIG7B ) compared to the solution in which the speaker 30 is not provided with an adjustment member 8 (as shown in FIG7A ). The gradient of the magnetic field between the upper and lower surfaces of the moving magnetic member 6 and between the upper and lower parts of the side surface is reduced, the force on the moving magnetic member 6 is reduced, and near-zero stiffness is achieved.

[0133] Similarly, as shown in Figures 7C and 7D, when the moving magnetic part 6 deviates from the equilibrium position and vibrates upward by a small amplitude, the difference in magnetic fields between the upper and lower sides of the moving magnetic part 6 is reduced in the solution in which the speaker 30 is provided with an adjustment part 8 (as shown in Figure 7D) compared to the solution in which the speaker 30 is not provided with an adjustment part 8 (as shown in Figure 7C). The gradient of the magnetic field between the upper and lower surfaces of the moving magnetic part 6 and between the upper and lower parts of the side surface is reduced, the force on the moving magnetic part 6 is reduced, and near-zero stiffness is achieved.

[0134] That is, as shown in FIG. 7B and FIG. 7D , the speaker 30 can adjust the area near the equilibrium position of the moving magnet 6 to a near-zero stiffness zone by adding the adjustment member 8 .

[0135] Please refer to FIG. 8 , which is a comparison diagram of the force curves of the moving magnetic member 6 when the speaker 30 shown in FIG. 3A is provided with the adjustment member 8 and when the adjustment member 8 is not provided.

[0136] In FIG8 , the horizontal axis represents the amplitude of the dynamic magnetic part 6, in millimeters (mm), and the horizontal axis represents the resultant force received by the dynamic magnetic part 6, in Newtons (N). The diamond point curve in FIG8 corresponds to the solution without the adjustment part 8, and the square point curve corresponds to the solution with the adjustment part 8. As shown in FIG8 , when the loudspeaker 30 is provided with the adjustment part 8, the force received by the dynamic magnetic part 6 of the loudspeaker 30 in the small amplitude region (for example, ≤±200um) is zero or nearly zero, and this region forms a near-zero stiffness region; in the large amplitude region, if the dynamic magnetic part 6 deviates from the equilibrium position and vibrates upward, the resultant force received is an upward force, and if the dynamic magnetic part 6 deviates from the equilibrium position and vibrates downward, the resultant force received is a downward force, and this region is a negative stiffness region.

[0137] Therefore, through the simulated magnetic field and force analysis of the dynamic magnetic part 6 in Figures 7A to 8, it can be known that the speaker 30 places the dynamic magnetic part 6 in the gap 3b of the magnetic circuit assembly 3, and the magnetic pole setting of the dynamic magnetic part 6 is consistent with the magnetic pole setting of the center magnet 31. By setting an adjustment part 8 in the gap 3b, the adjustment part 8 is a soft magnet, and the magnetic field of the gap 3b is adjusted by the adjustment part 8 to obtain a near-zero stiffness zone and a negative stiffness zone, so that the dynamic magnetic part 6 achieves zero stiffness or near-zero stiffness when vibrating with a small amplitude (corresponding to the near-zero stiffness zone), which is conducive to achieving a centering effect. When the dynamic magnetic part 6 vibrates with a large amplitude (corresponding to the negative stiffness zone), it achieves negative stiffness, thereby reducing the system stiffness, which is conducive to improving the low-frequency sensitivity of the speaker 30 and making the low-frequency performance of the speaker 30 better.

[0138] Please refer to Figure 5A again. In some embodiments, in the direction perpendicular to the diaphragm 2, the height center of the adjustment member 8 can be flush with the geometric center of the dynamic magnetic member 6, including two situations of being completely flush and nearly flush. Among them, the height center of the adjustment member 8 can usually correspond to the center position of the near-zero stiffness zone of the gap 3b. By designing the height center of the adjustment member 8 to be flush with the geometric center of the dynamic magnetic member 6, that is, flush with the geometric center of the dynamic magnetic member 6 when it is in the equilibrium position, it is beneficial for the dynamic magnetic member 6 to achieve zero stiffness or near-zero stiffness within a small amplitude. It can be understood that in the embodiment of the present application, the center position of the near-zero stiffness zone can be fine-tuned by adjusting the height center of the adjustment member 8.

[0139] In some embodiments, the loudspeaker 30 is designed with a gap 3b so that the magnetic force exerted on the moving magnetic element 6 in the near-zero stiffness region is very small, thereby better achieving zero stiffness. For example, the magnetic force exerted on the moving magnetic element 6 in the zero stiffness region can be reduced to 0.2 times or less of the magnetic force exerted on the moving magnetic element 6 at the corresponding amplitude position in a loudspeaker 30 without an adjustment member 8. In this case, the moving magnetic element 6 is essentially unaffected by the magnetic force or the magnetic force is very small in the near-zero stiffness region, and thus will not be subjected to a large magnetic force due to height position tolerance, thereby avoiding imbalance.

[0140] In some embodiments, the speaker 30 can adjust the size of the adjustment member 8 so that the height range of the near-zero stiffness area of ​​the gap 3b is ±H nz The unilateral amplitude of the moving magnetic element 6 must be less than or equal to ±30%. For example, in a direction perpendicular to the diaphragm 2, the height H of the adjustment member 8, the thickness T of the moving magnetic element 6, and the total height H0 of the central magnetic element 33, the central magnet 31, and the lower magnetic element 35 satisfy the following: 0.5 ≤ H / (0.3 * (H0 - T)) ≤ 1.5. In a direction perpendicular to the diaphragm 2, the unilateral amplitude of the moving magnetic element 6 is (H0 - T) / 2.

[0141] In this embodiment, the height center of the adjusting member 8 is generally consistent with the geometric center of the moving magnetic member 6, including a solution with completely flush height and a solution with nearly flush height. The height dimension of the adjusting member 8 and the range of the near-zero stiffness zone of the gap 3b are ±H nz Positive correlation, by designing 0.5≤H / (0.3*(H0-T))≤1.5, the gap 3b forms a near-zero stiffness zone within 30% of the amplitude of the dynamic magnetic part 6, so that the speaker 30 can better achieve the centering effect of the balanced position.

[0142] It is understandable that the speaker 30 can also achieve depth adjustment in the near-zero stiffness zone by designing the width of the adjusting member 8 and the gap between the adjusting member 8 and the moving magnetic member 6 .

[0143] Exemplarily, the width of the gap between the moving magnetic member 6 and the adjusting member 8 is greater than or equal to 0.1 mm. In other examples, the minimum width of the gap can be in the range of 0.1 mm to 0.15 mm. In this case, by limiting the gap between the moving magnetic member 6 and the adjusting member 8, the speaker 30 can take into account engineering capabilities, have a high product yield, and also enable the moving magnetic member 6 to generate a larger magnetic force.

[0144] Please refer to FIG. 5A again. In some embodiments, the connecting member 9 may be a soft magnet, and the two connecting members 9 may be located in the gap 3 b.

[0145] In this embodiment, the two connecting parts 9 are located in the gap 3b and are soft magnetic materials. Therefore, the connecting parts 9 can also adjust the magnetic field in the gap 3b, thereby achieving the growth rate adjustment of the magnetic force / stiffness curve with medium and high amplitudes (corresponding to the negative stiffness zone of the gap 3b).

[0146] As shown in Figures 7B and 7D, when the speaker 30 is provided with a connector 9, in the magnetic field simulation results of the gap 3b, the magnetic field gradient distribution of the negative stiffness region below the near-zero stiffness region (corresponding to the position near the connector 9) is different from the magnetic field gradient distribution of the negative stiffness region above the near-zero stiffness region.

[0147] As shown in Figure 8, when the speaker 30 is provided with a connecting part 9, the slope of the force condition of the dynamic magnetic part 6 in the negative stiffness area below the near-zero stiffness area (corresponding to the position near the connecting part 9) is different from the slope of the negative stiffness area above the near-zero stiffness area. The connecting part 9 can adjust the slope of the magnetic force in the area near it.

[0148] The following describes various implementation structures of the adjusting member 8 and the connecting member 9 by way of examples.

[0149] Please refer to Figure 6 again. In some embodiments, the two adjusting members 8, the two connecting members 9 and the lower magnetic conductive member 35 can be an integrally formed structural member. In other words, the two adjusting members 8, the two connecting members 9 and the lower magnetic conductive member 35 can be an integrated structure obtained by an integrated molding process. At this time, the two adjusting members 8 are fixed to the lower magnetic conductive member 35 by the two connecting members 9. In the embodiment of the present application, the multiple components are integrated by an integrated molding process, which means that in the process of forming one of the multiple components, the component is connected to the remaining components, and there is no need to connect the multiple components together through reprocessing (such as bonding, welding, snap connection, screw connection). For example, two integrated adjusting members 8, two connecting members 9 and the lower magnetic conductive member 35 can be obtained by stamping a plate.

[0150] In the embodiment of the present application, by providing the adjustment member 8, the connecting member 9 and the lower magnetic conductive member 35 as an integrally formed structural member, the number of components of the speaker 30 can be reduced, and the structure of the speaker 30 can be simplified to reduce the difficulty of processing caused by the cumulative transmission of the tolerance chain, thereby improving the reliability and consistency of the speaker 30 and enhancing the manufacturability.

[0151] For example, the two adjustment members 8 can be arranged in a first direction. The first direction can be parallel to the width direction X of the speaker 30. In this case, the first direction is parallel to the diaphragm 2. Each adjustment member 8 extends along a second direction. The second direction can be parallel to the length direction Y of the speaker 30. In this case, the second direction is parallel to the diaphragm 2 and perpendicular to the first direction.

[0152] In this embodiment, the adjusting member 8 is in the shape of an elongated strip. Referring to FIG. 5A and FIG. 6 , the adjusting member 8 extends along the length direction of the gap 3 b , thereby being able to reasonably control the amplitude of the near-zero stiffness zone of the gap 3 b and also meet the adjustment requirements of the magnetic field strength of the gap 3 b .

[0153] Exemplarily, the connector 9 may include a mating adjustment portion 91 and a transition portion 92. The mating adjustment portion 91 is connected between the adjustment member 8 and the transition portion 92, and the transition portion 92 is connected to the lower magnetic conductive member 35. The transition portion 92 has a curved structure. In some examples, the lower magnetic conductive member 35, the connector 9, and the adjustment member 8 may be plate-shaped during processing. By bending the transition portion 92 of the connector 9, the mating adjustment portion 91 and the adjustment member 8 are tilted relative to the lower magnetic conductive member 35, thereby obtaining the final structure of the connector 9 and the adjustment member 8.

[0154] For example, the lower magnetic conductive member 35 is provided with a plurality of grooves 353, which communicate with the third through-hole 351 and, in this case, also communicate with the gap 3b. A groove 353 is provided on both sides of each root portion where the transition portion 92 of the connector 9 connects to the lower magnetic conductive member 35. The grooves 353 can be semicircular, semicircular-like, U-shaped, V-shaped, or other shapes, and are not strictly limited in this embodiment of the present application.

[0155] In this embodiment, by providing grooves 353 on both sides of each root of the lower magnetic conductive part 35 connected to the transition part 92, the risk of damage such as tearing at the root connection of the connecting part 9 during the bending process can be reduced, thereby improving product yield and structural reliability.

[0156] For example, as shown in Figure 5A, the arrangement height of the transition portion 92 of the connecting member 9 mainly corresponds to the lower magnetic conductive member 35, and the arrangement height of the matching adjustment portion 91 mainly corresponds to the medium and high amplitude (which can correspond to the negative stiffness zone of the gap 3b). Therefore, the matching adjustment portion 91 can have a relatively effective magnetic field adjustment effect, and the speaker 30 can achieve magnetic field adjustment by adjusting the shape and size of the matching adjustment portion 91.

[0157] For example, as shown in FIG6 , in the XY plane of the loudspeaker 30 (i.e., in a direction parallel to the diaphragm 2), the cross-sectional area of ​​the mating adjustment portion 91 of the connector 9 is smaller than the cross-sectional area of ​​the adjustment member 8. In this case, the mating adjustment portion 91 has a smaller impact on the near-zero stiffness zone of the gap 3b, reducing the risk of the near-zero stiffness zone shifting downward and facilitating accurate setting of the near-zero stiffness zone and the negative stiffness zone.

[0158] In some examples, the mating adjustment portion 91 of the connector 9 may include two connecting segments 911, which are spaced apart along the second direction, that is, spaced apart along the length direction Y of the loudspeaker 30. Both connecting segments 911 extend in a direction perpendicular to the diaphragm 2, that is, along the thickness direction Z of the loudspeaker 30. The two ends of each connecting segment 911 are respectively fixed to the adjustment member 8 and the transition portion 92. The two connecting segments 911 are respectively connected to the two ends of the adjustment member 8. The transition portion 92 also includes two segments 921, which are respectively connected between the two connecting segments 911 and the lower magnetic conductive member 35. The adjustment member 8, the connector 9, and the partial structure of the lower magnetic conductive member 35 together form a square. In the lower magnetic conductive member 35, the aforementioned grooves 353 may be provided on both sides of each segment 921 of the transition portion 92.

[0159] In this embodiment, the adjusting member 8, the connecting member 9 and part of the structure of the lower magnetic conductive member 35 together form a U-shape, which is conducive to ensuring the structural strength and stability of the adjusting member 8, and the processing difficulty of the adjusting member 8 and the connecting member 9 is relatively small.

[0160] Please refer to FIG. 6 and FIG. 9 in combination. FIG. 9 is a schematic structural diagram of a plate material used to process the structure shown in FIG. 6 .

[0161] In some embodiments, during the process of processing the adjusting member 8, the connecting member 9, and the lower magnetic conductive member 35, a plate 40 may be formed first. The plate 40 may include a main body 401, two first portions 403, two second portions 404, and two third portions 405. The main body 401 has a through hole 402, which is used to form the lower magnetic conductive member 35. The through hole 402 is used to form the third through hole 351. The two first portions 403 are located in the through hole 402 and are arranged opposite each other, respectively connected to two opposite sides of the through hole 402. The first portion 403 is used to form the transition portion 92 of the connecting member 9. The two third portions 405 are located in the through hole 402 and are arranged opposite each other. The two third portions 405 are spaced apart and correspond one-to-one with the two first portions 403. The third portions 405 are used to form the adjusting member 8. Each second portion 404 includes two sections, which are arranged opposite each other and respectively connected between the two ends of the third portion 405 and the two ends of the first portion 403. The second portion 404 is used to form the fitting adjustment portion 91 of the connector 9 .

[0162] The two third portions 405 are arranged in direction X' and extend along direction Y'. Direction Y' is perpendicular to direction X'. The third portion 405 has a dimension dr in direction Z', and direction Z' is perpendicular to directions Y' and X'.

[0163] Among them, the first part 403 has a size W1 in the direction X'. W1 can be determined according to actual process requirements. If the size is too large, it will have a greater impact on the surrounding magnetic field. The magnetic field value of the corresponding height area can be fine-tuned to affect the magnetic field in the corresponding area. The specific size can be determined comprehensively based on process requirements and performance levels.

[0164] A section of the second portion 404 has a dimension W2 in the Y' direction. W2 can be determined based on actual process requirements. Excessive width can cause movement in the near-zero stiffness region. The specific dimension can be determined based on a combination of process requirements and acceptable performance levels. A section of the second portion 404 has a dimension W3 in the X' direction. W3 can be greater than or equal to 1.5 dr.

[0165] The third portion 405 has a dimension W4 in the direction X′, and W4 may be greater than or equal to 1.5 dr.

[0166] The gap between the two third portions 405 has a size W5, which may be greater than or equal to 1.5 dr.

[0167] The size of the first portion 403 in the direction Y' and the size of the third portion 405 in the direction Y' are comparable to the size of the moving magnet 6 in the longitudinal direction Y of the speaker 30 (see FIG. 3B ), but do not exceed the size of the gap 3b in the longitudinal direction Y of the speaker 30 (see FIG. 3B ).

[0168] In this embodiment, by setting the sizes of multiple parts of the plate 40, the subsequently formed adjusting member 8 and connecting member 9 can meet the magnetic field adjustment requirements while also having a high product yield and structural reliability.

[0169] For example, as shown in FIG6 , the ratio of the height of the adjusting member 8 in a direction perpendicular to the diaphragm 2 (i.e., the thickness direction Z of the speaker 30) to the width of the adjusting member 8 in a first direction (i.e., the width direction X of the speaker 30) is greater than or equal to 1.5. In this case, the adjusting member 8 can meet the magnetic field adjustment requirements and has a high structural reliability.

[0170] Please refer to Figures 10 to 11B . Figure 10 is a schematic diagram of a portion of the structure of the speaker 30 shown in Figure 1A in other embodiments. Figure 11A is a schematic diagram of the internal structure of the portion of the structure of the speaker 30 shown in Figure 1A in other embodiments. Figure 11B is a schematic diagram of the internal structure of the portion of the structure of the speaker 30 shown in Figure 1A in other embodiments. The speaker 30 shown in Figures 10 to 11B can include most of the technical features of the speaker 30 in the previous embodiment (corresponding to the relevant description of Figures 2 to 9 ). The following mainly describes the differences between the two embodiments, and most of the common technical features between the two embodiments are not repeated here.

[0171] In some embodiments, the structure of the connector 9 can be modified. Specifically, the transition portion 92 of the connector 9 is no longer divided into two sections, but instead forms a single, elongated strip. The transition portion 92 can extend along the second direction (i.e., the longitudinal direction Y of the speaker 30). The transition portion 92 is continuously connected to the lower magnetic conductive member 35. In this configuration, the transition portion 92 is less susceptible to damage such as tearing when bent.

[0172] The two connecting segments 911 of the mating adjustment portion 91 remain spaced apart, but one end of the connecting segment 911 may not be connected to the end of the adjusting member 8 but may be located a certain distance away from the end of the adjusting member 8, and the other end of the connecting segment 911 may be connected to the transition portion 92. In this case, the length of the mating adjustment portion 91 in the longitudinal direction Y of the speaker 30 may be smaller than the length of the adjusting member 8 in the longitudinal direction Y of the speaker 30. In the XY plane of the speaker 30, the cross-sectional area of ​​the mating adjustment portion 91 of the connector 9 is smaller than the cross-sectional area of ​​the adjusting member 8.

[0173] Among them, other design details of the speaker 30 of this embodiment can refer to the relevant description of the previous embodiment, such as the relevant design of the moving magnetic component 6, the adjustment component 8 and other structures, which will not be repeated here.

[0174] Please refer to FIG. 12 , which is a force curve diagram of the moving magnetic member 6 of the loudspeaker 30 shown in FIG. 1A in other embodiments.

[0175] In Figure 12 , the horizontal axis represents the amplitude of the moving magnetic member 6 in millimeters (mm), and the horizontal axis represents the net force acting on the moving magnetic member 6 in Newtons (N). Comparing Figure 12 with Figure 8 , it can be seen that in this embodiment, the shapes of the matching adjustment portion 91 and the transition portion 92 of the connecting member 9 are changed, and the magnetic field in the gap 3b is also adjusted accordingly compared to the previous embodiment. However, the gap 3b still includes a near-zero stiffness region and a negative stiffness region.

[0176] Please refer to Figures 13 to 14B. Figure 13 is a schematic diagram of a portion of the structure of the speaker 30 shown in Figure 1A in further embodiments. Figure 14A is a schematic diagram of the internal structure of the portion of the structure of the speaker 30 shown in Figure 1A in further embodiments. Figure 14B is a schematic diagram of the internal structure of the portion of the structure of the speaker 30 shown in Figure 1A in further embodiments. The speaker 30 shown in Figures 13 to 14B can include most of the technical features of the speaker 30 in the previous embodiment (corresponding to the relevant description of Figures 2 to 9). The following mainly describes the differences between the two embodiments, and most of the common technical features between the two embodiments are not repeated here.

[0177] In some embodiments, the structure of the connector 9 can be modified. Specifically, the transition portion 92 of the connector 9 is no longer divided into two sections, but instead forms a single, elongated strip. The transition portion 92 can extend along the second direction (i.e., the longitudinal direction Y of the speaker 30). The transition portion 92 is continuously connected to the lower magnetic conductive member 35. In this configuration, the transition portion 92 is less susceptible to damage such as tearing when bent.

[0178] The mating adjustment portion 91 is no longer divided into two sections, but instead presents a single-section structure. One end of the mating adjustment portion 91 is connected to the middle of the adjusting member 8, and the other end of the mating adjustment portion 91 can be connected to the middle of the transition portion 92. In this case, the cross-sectional area of ​​the mating adjustment portion 91 on the XY plane of the loudspeaker 30 is smaller. On the XY plane of the loudspeaker 30, the cross-sectional area of ​​the mating adjustment portion 91 of the connector 9 is smaller than the cross-sectional area of ​​the adjusting member 8.

[0179] Among them, other design details of the speaker 30 of this embodiment can refer to the relevant description of the previous embodiment, such as the relevant design of the moving magnetic component 6, the adjustment component 8 and other structures, which will not be repeated here.

[0180] Please refer to FIG. 15 , which is a force curve diagram of the moving magnetic member 6 of the loudspeaker 30 shown in FIG. 1A in still other embodiments.

[0181] In Figure 15 , the horizontal axis represents the amplitude of the moving magnetic member 6, in millimeters (mm), and the horizontal axis represents the net force acting on the moving magnetic member 6, in Newtons (N). Comparing Figure 15 with Figure 8 , it can be seen that in this embodiment, the shapes of the matching adjustment portion 91 and the transition portion 92 of the connecting member 9 are changed, and the magnetic field in the gap 3b is also adjusted accordingly compared to the previous embodiment. However, the gap 3b still includes a near-zero stiffness region and a negative stiffness region.

[0182] Please refer to Figures 16 to 17B . Figure 16 is a schematic diagram of a portion of the structure of the speaker 30 shown in Figure 1A in yet further embodiments. Figure 17A is a schematic diagram of the internal structure of the portion of the structure of the speaker 30 shown in Figure 1A in yet further embodiments. Figure 17B is a schematic diagram of the internal structure of the portion of the structure of the speaker 30 shown in Figure 1A in yet further embodiments. The speaker 30 shown in Figures 16 to 17B can include most of the technical features of the speaker 30 in the previous embodiment (corresponding to the relevant descriptions of Figures 2 to 9 ). The following mainly describes the differences between the two embodiments, and most of the common technical features between the two embodiments will not be repeated.

[0183] In some embodiments, the structure of the connector 9 can be modified. Specifically, the transition portion 92 of the connector 9 is no longer divided into two sections, but instead forms a single, elongated strip. The transition portion 92 can extend along the second direction (i.e., the longitudinal direction Y of the speaker 30). The transition portion 92 is continuously connected to the lower magnetic conductive member 35. In this configuration, the transition portion 92 is less susceptible to damage such as tearing when bent.

[0184] Among them, the fitting adjustment portion 91 is no longer divided into two sections, but is in the shape of an integrated long strip, and the fitting adjustment portion 91 can extend along the second direction (that is, the length direction Y of the speaker 30). The size of the fitting adjustment portion 91 in the first direction (that is, the width direction X of the speaker 30) is smaller than the size of the adjusting member 8 in the first direction (that is, the width direction X of the speaker 30). In other words, the fitting adjustment portion 91 is thinned relative to the adjusting member 8. In the second direction (that is, the length direction Y of the speaker 30), the length of one end of the fitting adjustment portion 91 connected to the adjusting member 8 is greater than the length of one end of the fitting adjustment portion 91 connected to the transition portion 92. At this time, the length of the fitting adjustment portion 91 in the length direction Y of the speaker 30 can be smaller than the length of the adjusting member 8 in the length direction Y of the speaker 30. In this embodiment, on the XY plane of the speaker 30, the cross-sectional area of ​​the fitting adjustment portion 91 of the connecting member 9 is smaller than the cross-sectional area of ​​the adjusting member 8.

[0185] Among them, other design details of the speaker 30 of this embodiment can refer to the relevant description of the previous embodiment, such as the relevant design of the moving magnetic component 6, the adjustment component 8 and other structures, which will not be repeated here.

[0186] Please refer to FIG. 18 , which is a force curve diagram of the moving magnetic member 6 of the loudspeaker 30 shown in FIG. 1A in yet other embodiments.

[0187] In Figure 18 , the horizontal axis represents the amplitude of the moving magnetic member 6, in millimeters (mm), and the horizontal axis represents the net force acting on the moving magnetic member 6, in Newtons (N). Comparing Figure 18 with Figure 8 , it can be seen that in this embodiment, the shapes of the matching adjustment portion 91 and the transition portion 92 of the connecting member 9 are changed, and the magnetic field in the gap 3b is also adjusted accordingly compared to the previous embodiment. However, the gap 3b still includes a near-zero stiffness region and a negative stiffness region.

[0188] Please refer to Figures 19 to 20B. Figure 19 is a schematic diagram of a portion of the structure of the speaker 30 shown in Figure 1A in yet further embodiments. Figure 20A is a schematic diagram of the internal structure of the portion of the structure of the speaker 30 shown in Figure 1A in yet further embodiments. Figure 20B is a schematic diagram of the internal structure of the portion of the structure of the speaker 30 shown in Figure 1A in yet further embodiments. The speaker 30 shown in Figures 19 to 20B can include most of the technical features of the speaker 30 in the previous embodiment (corresponding to the relevant description of Figures 2 to 9). The following mainly describes the differences between the two embodiments, and most of the common technical features between the two embodiments will not be repeated.

[0189] In some embodiments, the structure of the connector 9 can be modified. Specifically, the transition portion 92 of the connector 9 is no longer divided into two sections, but instead forms a single, elongated strip. The transition portion 92 can extend along the second direction (i.e., the longitudinal direction Y of the speaker 30). The transition portion 92 is continuously connected to the lower magnetic conductive member 35. In this configuration, the transition portion 92 is less susceptible to damage such as tearing when bent.

[0190] Among them, the fitting adjustment portion 91 is no longer divided into two sections, but is in the shape of an integrated long strip, and the fitting adjustment portion 91 can extend along the second direction (that is, the length direction Y of the speaker 30). The size of the fitting adjustment portion 91 in the first direction (that is, the width direction X of the speaker 30) is smaller than the size of the adjusting member 8 in the first direction (that is, the width direction X of the speaker 30). In other words, the fitting adjustment portion 91 is thinned relative to the adjusting member 8. At this time, on the XY plane of the speaker 30, the cross-sectional area of ​​the fitting adjustment portion 91 of the connecting member 9 is smaller than the cross-sectional area of ​​the adjusting member 8.

[0191] Among them, other design details of the speaker 30 of this embodiment can refer to the relevant description of the previous embodiment, such as the relevant design of the moving magnetic component 6, the adjustment component 8 and other structures, which will not be repeated here.

[0192] In this embodiment, the shapes of the fitting adjustment portion 91 and the transition portion 92 of the connector 9 are changed, and the magnetic field in the gap 3b is adjusted accordingly compared to the previous embodiment. However, the gap 3b still includes a near-zero stiffness region and a negative stiffness region.

[0193] In other embodiments of the present application, the speaker 30 may not be provided with the connecting member 9, and the two adjusting members 8 may be directly fixed to the lower magnetic conductive member 35. The two adjusting members 8 and the lower magnetic conductive member 35 are integrally formed structural members. In this embodiment, by providing the adjusting members 8 and the lower magnetic conductive member 35 as an integrally formed structural member, the number of components of the speaker 30 can be reduced, the structure of the speaker 30 can be simplified, and the difficulty of manufacturing caused by the cumulative transmission of tolerance chains can be reduced, thereby improving the reliability and consistency of the speaker 30 and enhancing manufacturability.

[0194] In other embodiments of the present application, the two adjusting members 8 may also be structural members fixed to the central magnetic member 33 and integrally formed with the central magnetic member 33. In this case, the positions of the two connecting members 9 are adjusted accordingly. The two connecting members 9 are respectively connected between the two adjusting members 8 and the central magnetic member 33. The two adjusting members 8, the two connecting members 9, and the central magnetic member 33 are an integrally formed structural member. For other details of the adjusting members 8 and the connecting members 9, please refer to the relevant description of the previous embodiment and will not be repeated here.

[0195] In some other embodiments of the present application, the speaker 30 may also include two connecting adjustment members (not shown in the figure), which are arranged opposite to each other and respectively connected between the two ends of the two adjustment members 8. At this time, the two adjustment members 8 and the two connecting adjustment members together form an annular structure, which is located in the gap 3b and is arranged around the dynamic magnetic member 6. In some examples, the connecting adjustment member is a soft magnet, and the connecting adjustment member can also achieve the function of adjusting the magnetic field. In some examples, the connecting adjustment member can also be a structural member integrally formed with the lower magnetic conductive member 35 or the central magnetic conductive member 33, that is, an integrated structure is formed through an integrated molding process.

[0196] In the above embodiments, the moving magnetic member 6 is illustrated as an example including a permanent magnet. In some other embodiments of the present application, the moving magnetic member 6 may also be a composite structural member.

[0197] Exemplarily, the moving magnetic member 6 may include at least two magnetic members. For example, the moving magnetic member 6 may include at least two permanent magnets. The magnetic poles of the at least two permanent magnets may be the same or different, and the shapes and sizes of the at least two permanent magnets may be the same or different. Alternatively, the moving magnetic member 6 may include at least one permanent magnet and at least one soft magnet.

[0198] The at least two magnetic members may be stacked in the thickness direction Z of the speaker 30. Alternatively, the at least two magnetic members may be stacked in other directions, or there may be multiple stacking directions or structures, which are not strictly limited in the embodiment of the present application.

[0199] In this embodiment, the loudspeaker 30 can adjust the magnetic force or stiffness curve by designing the topology of the moving magnetic component 6 itself.

[0200] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other, and any combination of features in different embodiments is also within the scope of protection of this application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

[0201] It should be noted that all the above drawings are for illustrative purposes only and do not represent the actual size of the product. Furthermore, the dimensional ratios between the components in the drawings are not intended to limit the actual product of the present application.

[0202] The above are only some of the embodiments and implementations of this application. The scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A loudspeaker, characterized in that, It includes a housing, a magnetic circuit assembly, a diaphragm, and a voice coil. The magnetic circuit assembly is fixedly connected to the housing. The magnetic circuit assembly is provided with a magnetic gap. The diaphragm is fixedly connected to the housing. The diaphragm is disposed opposite to the magnetic circuit assembly. One end of the voice coil is fixedly connected to the diaphragm, and the other end of the voice coil is located in the magnetic gap. The magnetic circuit assembly includes a central magnet, a central magnetic conductor, and a lower magnetic conductor. The central magnetic conductor is fixed to the side of the central magnet facing the diaphragm. The lower magnetic conductor is fixed to the side of the central magnet facing away from the diaphragm. The magnetic circuit assembly is further provided with a void, and the void is spaced apart from the magnetic gap. The void penetrates through the central magnetic conductor, the central magnet, and the lower magnetic conductor. The loudspeaker further includes a moving magnet and two adjusting members, and the moving magnet and the two adjusting members are both located in the void. Wherein, the moving magnet is fixedly connected to the diaphragm. The magnetic pole of the end of the moving magnet close to the diaphragm is the same as the magnetic pole of the end of the central magnet close to the diaphragm. The magnetic pole of the end of the moving magnet away from the diaphragm is the same as the magnetic pole of the end of the central magnet away from the diaphragm. The adjusting member is a soft magnetic body. The two adjusting members are respectively located on both sides of the moving magnet and are spaced apart from the moving magnet. The two adjusting members are fixed to the lower magnetic conductor and are a structural member integrally formed with the lower magnetic conductor, or the two adjusting members are fixed to the central magnetic conductor and are a structural member integrally formed with the central magnetic conductor.

2. The loudspeaker according to claim 1, characterized in that, The loudspeaker further includes two connecting members, and the two connecting members are respectively connected between the two adjusting members and the lower magnetic conductor. The connecting member is a soft magnetic body. The two adjusting members, the two connecting members, and the lower magnetic conductor are a structural member integrally formed.

3. The loudspeaker according to claim 2, wherein The connecting member includes a fitting adjustment portion and a transition portion. The fitting adjustment portion is connected between the adjusting member and the transition portion. The transition portion is connected to the lower magnetic conductor, and the transition portion is provided with a bending structure. In the direction parallel to the diaphragm, the cross-sectional area of the fitting adjustment portion is smaller than the cross-sectional area of the adjusting member.

4. The loudspeaker according to claim 3, characterized in that, The lower magnetic conductor is provided with a plurality of grooves, and the plurality of grooves communicate with the void. Grooves are provided on both sides of each root of the transition portion connecting the lower magnetic conductor.

5. The loudspeaker according to claim 3, wherein The two adjusting members are arranged in a first direction, and the first direction is parallel to the diaphragm. Each adjusting member extends along a second direction, and the second direction is parallel to the diaphragm and perpendicular to the first direction. The fitting adjustment portion includes two connecting segments. The two connecting segments are spaced apart along the second direction and both extend in the direction perpendicular to the diaphragm. The two ends of the connecting segment are respectively fixed to the adjusting member and the transition portion.

6. The loudspeaker according to claim 1, wherein The two adjusting members are arranged in a first direction, and the first direction is parallel to the diaphragm. Each adjusting member extends along a second direction, and the second direction is parallel to the diaphragm and perpendicular to the first direction.

7. The loudspeaker according to claim 5 or 6, characterized in that, The ratio of the height of the adjusting member in the direction perpendicular to the diaphragm to the width of the adjusting member in the first direction is greater than or equal to 1.

5.

8. The loudspeaker according to any one of claims 1 to 6, characterized in that, In a direction perpendicular to the diaphragm, the height H of the adjusting member, the thickness T of the moving magnetic member, and the total height H0 of the central magnetic conductive member, the central magnet, and the lower magnetic conductive member satisfy: 0.5 ≤ H / (0.3*(H0 - T)) ≤ 1.

5.

9. The loudspeaker according to any one of claims 1 to 6, characterized in that The central magnet has a width W0 and a length L0, and the air gap includes a first through hole located in the central magnet. The first through hole has a width W and a length L, satisfying: W*L ≤ W0*L0 / 9; Or, W0 / L0 = W / L, and W ≤ W0 / 3, L ≤ L0 / 3.

10. The loudspeaker according to any one of claims 1 to 6, characterized in that, The width of the gap between the moving magnetic member and the adjusting member is greater than or equal to 0.1 mm.

11. The loudspeaker according to any one of claims 1 to 6, characterized in that The magnetic circuit assembly further includes side magnets and side magnetic conductive members. The side magnets are fixed to the lower magnetic conductive member. The side magnets surround the central magnet and are spaced apart from the central magnet. The side magnetic conductive members are fixed to the side of the side magnets facing the diaphragm and are spaced apart from the central magnetic conductive member. The magnetic gap includes the gap between the side magnets and the central magnet and the gap between the side magnetic conductive members and the central magnetic conductive member.

12. The loudspeaker according to any one of claims 1 to 6, characterized in that, The moving magnetic member includes a permanent magnet, or includes at least two permanent magnets, or includes at least one permanent magnet and at least one soft magnetic body.

13. An electronic device, characterized in that, It includes a housing and the loudspeaker according to any one of claims 1 to 12, and the loudspeaker is installed in the housing.

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