Loudspeaker and electronic device

Abstract

The present application provides a loudspeaker and an electronic device. The loudspeaker comprises a housing, a magnetic circuit system, a vibration system, and an adjustment system. The magnetic circuit system is fixed to the housing. A clearance hole is formed in a middle magnetic circuit of the magnetic circuit system. The clearance hole is spaced apart from a magnetic gap. A diaphragm of the vibration system comprises a first portion, a second portion, and a third portion. The third portion is connected between the first portion and the second portion. The adjustment system comprises a first magnetic portion, a magnetic attraction portion, and a second magnetic portion. The first magnetic portion and the second magnetic portion are located on two opposite sides of the diaphragm, respectively. The second magnetic portion is located in the clearance hole, and the magnetic attraction portion is fixedly connected to the first portion. The distance between the magnetic attraction portion and the first magnetic portion is equal to the distance between the magnetic attraction portion and the second magnetic portion, and the distance between the first portion and the second magnetic portion is less than the distance between the second portion and the second magnetic portion. The first portion and the third portion define a recessed space, and the projection of the first portion on the middle magnetic circuit is located in the clearance hole. The magnetic attraction portion is attractive to both the first magnetic portion and the second magnetic portion.

Description

Speakers and electronic devices

[0001] This application claims priority to the Chinese patent application with application number 202311444381.8 filed with the State Intellectual Property Office of China on October 31, 2023, 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 loudspeakers, and in particular to a loudspeaker and an electronic device. Background Art

[0003] Traditional loudspeaker designs typically include a vibration system and a magnetic circuit system. The vibration system includes a diaphragm and a voice coil mounted on it. The magnetic circuit system provides a magnetic field around the voice coil. When current is applied to the voice coil, the Ampere force causes it to deviate from its equilibrium position and reciprocate, pushing the diaphragm to vibrate. This elastic deformation of the vibration system generates an elastic restoring force to counteract this deformation. This elastic restoring force dampens the vibration of the diaphragm, causing the speaker's resonant frequency to increase and the speaker's low-frequency performance to degrade.

[0004] Currently, the elastic restoring force of the vibration system is typically reduced by thinning the diaphragm surround or selecting a material with a lower Young's modulus for the diaphragm surround. However, this can cause the voice coil to deflect or tilt left and right during its reciprocating motion, a phenomenon known as polarization. This can cause the voice coil to rub against the magnetic circuit components, generating noise and affecting the speaker's acoustic performance.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a loudspeaker and an electronic device, aiming to provide a loudspeaker with smaller voice coil swing and better low-frequency performance, and an electronic device including the loudspeaker.

[0007] In a first aspect, a loudspeaker is provided. The loudspeaker includes a housing, a magnetic circuit system, a vibration system, and an adjustment system. The magnetic circuit system is fixed to the housing, and includes an intermediate magnetic circuit and a side magnetic circuit. The intermediate magnetic circuit and the side magnetic circuit are spaced apart, and a magnetic gap is formed between the intermediate magnetic circuit and the side magnetic circuit. The intermediate magnetic circuit is provided with an avoidance hole, and the avoidance hole is spaced apart from the magnetic gap. The vibration system includes a diaphragm and a voice coil. The diaphragm is fixed to the housing and spaced apart from the magnetic circuit system. The voice coil is fixedly connected to the diaphragm, and at least part of the voice coil is located in the magnetic gap. The diaphragm includes a first part, a second part, and a third part, and the third part is connected between the first part and the second part. The adjustment system includes a first magnetic part, a magnetic attraction part, and a second magnetic part. The third part is connected between the first part and the second part. The first magnetic part and the second magnetic part are respectively located on two opposite sides of the diaphragm and are fixed relative to the shell. The second magnetic part is located in the avoidance hole. The magnetic attraction part is fixedly connected to the first part. In the thickness direction of the diaphragm, the distance from the magnetic attraction part to the first magnetic part is equal to the distance from the magnetic attraction part to the second magnetic part; in the thickness direction of the diaphragm, the distance from the first part to the second magnetic part is smaller than the distance from the second part to the second magnetic part. The first part and the third part enclose a sinking space, and the projection of the first part on the middle magnetic circuit is located in the avoidance hole. At least one of the first magnetic part, the magnetic attraction part and the second magnetic part is a permanent magnet, the first magnetic part and the magnetic attraction part generate attraction, and the second magnetic part and the magnetic attraction part generate attraction.

[0008] It will be understood that the speaker in this embodiment includes an adjustment system, wherein the adjustment system's magnetic portion is fixed to the diaphragm, and the adjustment system's first and second magnetic portions are respectively fixed to opposite sides of the diaphragm. At least one of the first, second, and third magnetic portions of the adjustment system is a permanent magnet. In the thickness direction of the diaphragm, the distance from the magnetic portion to the first magnetic portion can be equal to the distance from the magnetic portion to the second magnetic portion. The magnetic portion can simultaneously experience a first attractive force from the first magnetic portion and a second attractive force from the second magnetic portion. The direction of the first attractive force is opposite to the direction of the second attractive force. As the absolute value of the displacement of the voice coil relative to its equilibrium position increases, the absolute value of the total force exerted on the magnetic portion by the first and second magnetic portions also increases, and the absolute value of the force exerted by the magnetic portion on the vibration system also increases. The direction of the force exerted by the magnetic portion on the vibration system is opposite to the direction of the elastic restoring force of the vibration system itself. Thus, the force exerted by the adjustment system on the vibration system (in this embodiment, the total force exerted on the magnetic portion by the first and second magnetic portions) can be equivalent to an elastic component, and the spring constant of this elastic component can be Km. At this time, the resonant frequency F0 of the speaker can be:

[0009] As can be seen from the above expression, the force exerted by the adjustment system on the vibration system in this embodiment can offset at least part of the elastic restoring force of the vibration system itself in the speaker, thereby effectively reducing the impact of the vibration system's own elastic restoring force on the vibration of the diaphragm. As a result, under the same conditions of diaphragm thickness and material, the speaker in this embodiment has a lower resonant frequency and better low-frequency performance. In other words, the speaker in this embodiment can achieve good low-frequency performance while meeting the rigidity requirements of the vibration system itself, resulting in less wobble during voice coil movement.

[0010] Secondly, the middle magnetic circuit of the magnetic circuit system in this embodiment has a avoidance hole arranged at intervals from the magnetic gap of the magnetic circuit system, and the second magnetic part of the adjustment system is located in the avoidance hole. At the same time, the first part of the diaphragm is arranged close to the avoidance hole relative to the second part, and the third part of the diaphragm is connected between the first part and the second part, and encloses a sinking space with the first part. The projection of the first part on the middle magnetic circuit can be located in the avoidance hole. The magnetic attraction part of the adjustment system can be fixedly connected to the first part of the diaphragm. In this way, by arranging the avoidance hole in the magnetic attraction part and cooperating with the sinking space formed on the diaphragm, the adjustment system can be arranged using the thickness space of the magnetic circuit system, thereby reducing the overall thickness of the speaker. In other words, the speaker in this embodiment can achieve a thin setting while having good low-frequency performance.

[0011] In one possible implementation, the spacing between the first portion and the second magnetic portion is greater than 0.12 mm, and the spacing between the third portion and the magnetic circuit system is greater than 0.12 mm. This provides a certain spacing between the first portion and the second magnetic portion, and between the third portion and the magnetic circuit system, thereby preventing the diaphragm from rubbing against the magnetic circuit system or the second magnetic portion during vibration, generating abnormal noise and affecting the normal operation of the speaker.

[0012] In one possible implementation, the speaker further includes a first magnetic conductive sheet, the first magnetic conductive sheet being fixedly connected to the surface of the magnetic circuit system facing away from the diaphragm and the housing, the avoidance hole exposing at least a portion of the first magnetic conductive sheet, and the second magnetic portion being fixedly connected to the first magnetic conductive sheet. It will be appreciated that, under the condition that the forces acting between the second magnetic portion and the magnetic attraction portion are of the same magnitude, this embodiment increases the magnetic induction strength between the second magnetic portion and the magnetic attraction portion by providing the first magnetic conductive sheet, thereby effectively reducing the thickness of the second magnetic portion itself, thereby facilitating a thinner speaker configuration.

[0013] In one possible implementation, the speaker further includes a second magnetic conductive sheet, at least partially located on a side of the first magnetic portion facing away from the magnetic attraction portion, and fixedly connected to the first magnetic portion and the housing. It will be appreciated that, under the condition that the forces acting between the first magnetic portion and the magnetic attraction portion are of equal magnitude, this embodiment increases the magnetic induction strength between the first magnetic portion and the magnetic attraction portion by providing the second magnetic conductive sheet, thereby effectively reducing the thickness of the first magnetic portion itself, thereby facilitating a thinner speaker configuration.

[0014] In one possible implementation, the second magnetic conductive sheet includes a main body and an annular portion, the annular portion is connected to the outer periphery of the main body, the main body is located on the side of the first magnetic portion facing away from the magnetic attraction portion, and is fixedly connected to the first magnetic portion and the shell, and the annular portion is arranged around the first magnetic portion. In this way, the second magnetic conductive sheet can semi-surround the first magnetic portion, thereby better enhancing the magnetic induction intensity between the first magnetic portion and the magnetic attraction portion. Under the condition that the magnetic induction intensity between the first magnetic portion and the magnetic attraction portion is the same, the thickness of the first magnetic portion in this embodiment can be thinner, which is conducive to achieving a thinner setting of the speaker.

[0015] In one possible implementation, the magnetic portion is fixedly connected to the surface of the first portion facing the avoidance hole. Thus, under the condition that the distance between the magnetic portion and the first magnetic portion is the same, compared to when the magnetic portion is fixed to the surface of the first portion of the diaphragm facing the first magnetic portion, the first portion is sunken further relative to the second portion. That is, the sunken space enclosed by the first and third portions of the diaphragm is larger, resulting in greater stretching during diaphragm preparation and greater preparation difficulty. In contrast, in this embodiment, the magnetic portion is fixed to the surface of the first portion of the diaphragm facing away from the first magnetic portion, resulting in a smaller sunken space between the first and third portions of the diaphragm. This helps reduce stretching of the diaphragm, lowers the difficulty of diaphragm preparation, and improves production efficiency and product yield. Furthermore, when the rear cavity of the speaker is a closed space, the magnetic portion is fixed to the surface of the first portion of the diaphragm facing away from the first magnetic portion, allowing the magnetic portion to be located within the rear cavity of the speaker. This helps improve the magnetic portion's waterproofing capabilities and extend the speaker's service life.

[0016] In a possible implementation, both the first magnetic portion and the second magnetic portion are permanent magnets, and a portion of the first magnetic portion facing the second magnetic portion is attracted to a portion of the second magnetic portion facing the first magnetic portion.

[0017] It can be understood that the first magnetic part and the second magnetic part of the loudspeaker in this embodiment can both be permanent magnets. The polarization direction of the first magnetic part and the polarization direction of the second magnetic part can be the same, and both are parallel to the thickness direction of the diaphragm. That is, the part of the first magnetic part facing the second magnetic part can be attracted to the part of the second magnetic part facing the first magnetic part. In this way, the force between the first magnetic part and the second magnetic part is an attractive force. Compared with the loudspeaker in which the force between the first magnetic part and the second magnetic part is a repulsive force, during its assembly process, due to the repulsive force generated between the first magnetic part and the second magnetic part, when the first magnetic part is installed after the second magnetic part is installed, the first magnetic part is fixed in the direction toward the second magnetic part and is subject to a repulsive force from the second magnetic part. The direction of the repulsive force is opposite to the installation direction of the first magnetic part, which causes the first magnetic part to produce an assembly tolerance. In this embodiment, the force between the first magnetic part and the second magnetic part is an attractive force. When the first magnetic part is fixed in the direction toward the second magnetic part, the direction of the attractive force between the first magnetic part and the second magnetic part is the same as the installation direction of the first magnetic part, thereby effectively avoiding the problem of assembly tolerance caused by the repulsive force from the second magnetic part during the assembly process of the first magnetic part, which is beneficial to improving the product yield of the speaker.

[0018] In one possible implementation, the magnetic attraction portion is a soft magnet; or, the magnetic attraction portion is a permanent magnet, and the portion of the magnetic attraction portion facing the first magnetic portion is attracted to the portion of the first magnetic portion facing the magnetic attraction portion. In this way, when the magnetic attraction portion is a soft magnet, under the condition that the volume of the magnetic attraction portion is the same, the density of the magnetic attraction portion is smaller, so that the mass of the magnetic attraction portion is smaller, thereby reducing the pulling of the diaphragm by the magnetic attraction portion and avoiding deformation of the diaphragm. When the magnetic attraction portion is a permanent magnet, the magnetic induction intensity between the magnetic attraction portion and the first magnetic portion is large, and the magnetic induction intensity between the magnetic attraction portion and the second magnetic portion is also large. Under the condition that the magnetic induction intensity between the magnetic attraction portion and the first magnetic portion is the same, and the magnetic induction intensity between the magnetic attraction portion and the second magnetic portion is also the same, the thickness of both the first magnetic portion and the second magnetic portion can be reduced, which is conducive to achieving a thin setting of the speaker.

[0019] In one possible implementation, the speaker further includes a first gasket, the first gasket being positioned between the first magnetic portion and the magnetic portion and being fixedly connected to the first magnetic portion or the magnetic portion. It is understood that by positioning the first gasket between the first magnetic portion and the magnetic portion, it is possible to effectively prevent excessive attraction between the magnetic portion and the voice coil when the voice coil moves closer to the first magnetic portion or the second magnetic portion, thereby preventing the magnetic portion from adhering to the first magnetic portion or the second magnetic portion and affecting normal operation of the speaker.

[0020] In one possible implementation, the first magnetic part includes a first middle magnet and a first side magnet, and a first gap is formed between the first middle magnet and the first side magnet; the magnetic attraction part is provided with at least one through hole, and the projection of the first gap on the magnetic attraction part along the thickness direction of the diaphragm is arranged at intervals from the through hole.

[0021] It can be understood that in the present embodiment, there is a first gap between the first middle magnet and the first side magnet of the first magnetic part. The magnetic induction intensity of the first magnetic part near the first gap is relatively strong. The magnetic attraction part has at least one through hole, and the projection of the first gap of the first magnetic part on the magnetic attraction part along the thickness direction of the diaphragm can be spaced apart from the through hole. In this way, the through hole of the magnetic attraction part can avoid the area where the magnetic induction intensity of the first magnetic part is relatively strong, that is, the magnetic attraction part itself can be located in the area where the magnetic induction intensity of the first magnetic part is relatively strong, thereby ensuring the force between the first magnetic part and the magnetic attraction part while reducing the mass of the magnetic attraction part to reduce the influence of the magnetic attraction part on the vibration of the diaphragm. In addition, the overall mass of the speaker is relatively light, which is conducive to achieving a lightweight setting of the speaker.

[0022] In one possible implementation, the projection of the magnetic portion on the plane of the diaphragm is symmetrically arranged about the center of the diaphragm. This allows the magnetic portion to exert its force on the diaphragm at the center of the diaphragm, thereby ensuring torque balance in the vibration system and preventing the magnetic portion's force from deviating from the center of the diaphragm, causing the diaphragm to deflect during vibration and affecting normal speaker operation.

[0023] In one possible implementation, the first and second magnetic portions are symmetrically arranged about the magnetic attraction portion. This allows the forces acting between the first and second magnetic portions to be aligned on the same straight line, thereby preventing the magnetic attraction portion from deflecting due to forces acting on different straight lines, thereby preventing the diaphragm from moving normally.

[0024] In one possible implementation, when no current is input to the voice coil, the force exerted by the adjustment system on the vibration system is opposite to the elastic restoring force of the vibration system itself. This force is opposite to the elastic restoring force of the vibration system itself, thereby offsetting at least part of the elastic restoring force and improving the low-frequency performance of the speaker.

[0025] In a second aspect, an electronic device is provided. The electronic device includes a device housing and the aforementioned speaker, wherein the speaker is disposed within the device housing. The speaker in the electronic device of this embodiment can achieve good low-frequency performance while meeting the rigidity requirements of the vibration system itself, and the swing of the voice coil during movement is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the implementation methods or background technologies of the present application, the drawings required for use in the implementation methods or background technologies of the present application will be described below.

[0027] FIG1 is a schematic structural diagram of an electronic device provided in an embodiment of the present application;

[0028] FIG2 is a schematic structural diagram of a speaker of the electronic device shown in FIG1 in one embodiment;

[0029] FIG3 is a schematic diagram of the exploded structure of the speaker shown in FIG2 in some embodiments;

[0030] FIG4 is a schematic diagram of the exploded structure of the magnetic circuit system and the first magnetic conductive sheet shown in FIG3 ;

[0031] FIG5 is a schematic diagram of the assembly structure of the structure shown in FIG4;

[0032] FIG6 is a partial cross-sectional structural diagram of an embodiment of the loudspeaker shown in FIG2 taken along line AA;

[0033] FIG7 is a schematic diagram of the exploded structure of the vibration system shown in FIG3 ;

[0034] FIG8 is a schematic diagram of the assembly structure of the structure shown in FIG7;

[0035] FIG9 is a partial cross-sectional structural diagram of an embodiment of the loudspeaker shown in FIG2 taken along line AA;

[0036] FIG10 is a schematic diagram of the exploded structure of the vibration system, magnetic circuit system and support member shown in FIG3 ;

[0037] FIG11 is a schematic diagram of the assembly structure of the structure shown in FIG10;

[0038] FIG12 is a partial cross-sectional structural diagram of an embodiment of the loudspeaker shown in FIG2 taken along line AA;

[0039] FIG13 is a schematic cross-sectional view of the speaker shown in FIG2 taken along line AA in one embodiment;

[0040] FIG14 is a schematic cross-sectional view of the structure shown in FIG13 after the housing is hidden;

[0041] FIG15 a is a simplified schematic diagram of a portion of the structure shown in FIG14 when the voice coil is in a balanced position;

[0042] FIG15 b is a schematic diagram of a magnetic field simulation of a portion of the structure shown in FIG14 when the voice coil is in an equilibrium position;

[0043] FIG16 a is a simplified schematic diagram of a portion of the structure shown in FIG14 at one moment when a first current is input to the voice coil;

[0044] FIG16 b is a schematic diagram of a magnetic field simulation of a portion of the structure shown in FIG14 at one moment when a first current is input into the voice coil;

[0045] FIG17 a is a simplified schematic diagram of a portion of the structure shown in FIG14 at one moment when a second current is input to the voice coil;

[0046] FIG17 b is a schematic diagram of a magnetic field simulation of a portion of the structure shown in FIG14 at one moment when a second current is input into the voice coil;

[0047] FIG18 is a schematic diagram of a simulation curve showing the displacement of the voice coil of the loudspeaker shown in FIG14 and the force exerted by the adjustment system on the vibration system;

[0048] FIG19 is a schematic diagram comparing a simulation curve of the displacement of the voice coil of the loudspeaker shown in FIG14 and the total stiffness coefficient of the vibration system with a simulation curve of the displacement of the voice coil of a general loudspeaker and the total stiffness coefficient of the vibration system;

[0049] FIG20 is a schematic diagram of frequency response curve simulation of the loudspeaker shown in FIG14 and a general loudspeaker;

[0050] FIG21 a is a simplified schematic diagram of the structure shown in FIG15 a in another embodiment;

[0051] FIG21 b is a simplified schematic diagram of the structure shown in FIG15 a in another embodiment;

[0052] FIG22 is a simplified schematic diagram of the structure shown in FIG15a in another embodiment;

[0053] FIG23 is a simplified schematic diagram of the structure shown in FIG22 in another embodiment;

[0054] FIG24 is a simplified schematic diagram of the structure shown in FIG22 in another embodiment;

[0055] FIG. 25 is a simplified schematic diagram of the structure shown in FIG. 15 a in yet another embodiment. DETAILED DESCRIPTION

[0056] The embodiments of the present application are described below in conjunction with the accompanying drawings in the embodiments of the present application.

[0057] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present application, such as "upper", "lower", "inside", "outside", etc., are only reference to the directions of the accompanying 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 device or element referred to 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. "Multiple" means at least two.

[0058] 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.

[0059] In the embodiments of this application, "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0060] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in some other embodiments," and "in another embodiment" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0061] It is understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings.

[0062] FIG1 is a schematic structural diagram of an electronic device 1000 provided in an embodiment of the present application.

[0063] As shown in FIG1 , electronic device 1000 may be a mobile phone, tablet computer, multimedia player, headphones, speakers, laptop computer, in-vehicle device, foldable terminal device, television, or wearable device, or other device with a speaker and / or microphone. Among them, wearable devices may be smart bracelets, smart watches, smart head-mounted displays, smart glasses, etc. The electronic device 1000 of the embodiment shown in FIG1 is described using a mobile phone as an example.

[0064] For example, the electronic device 1000 may include a speaker 100, a device housing 200, and a display screen 300. The device housing 200 may include a frame 201 and a back cover 202. The frame 201 is connected to the back cover 202 and is disposed around the back cover 202. The frame 201 is provided with a sound outlet 203. The number of sound outlets 203 may be one or more. The number of sound outlets 203 illustrated in FIG1 is multiple. In other embodiments, the sound outlet 203 may also be provided on the back cover 202.

[0065] For example, the display screen 300 can be fixed to the frame 201. The display screen 300, the frame 201, and the back cover 202 can enclose the interior of the electronic device 1000. The display screen 300 can be an organic light-emitting diode (OLED) display screen, an active matrix organic light-emitting diode (AMOLED), or a liquid crystal display (LCD).

[0066] Exemplarily, the speaker 100 can be located inside the electronic device 1000. FIG1 schematically illustrates the speaker 100 through a dotted line. The speaker 100 can play sound to the outside of the electronic device 1000 through the sound outlet 203. In other embodiments, the electronic device 1000 can also include a plurality of speakers 100, and the plurality of speakers 100 can be used to emit sounds of multiple tracks to form stereo. It should be noted that FIG1 only schematically shows some components of the electronic device 1000, and the actual shapes and actual sizes of these components are not limited by FIG1 and the various figures below. It should be understood that when the electronic device 1000 is in other forms, the electronic device 1000 may also not include the display screen 300, or the electronic device 1000 may include a plurality of display screens 300.

[0067] Fig. 2 is a schematic diagram of the structure of the speaker 100 in one embodiment of the electronic device 1000 shown in Fig. 1. Fig. 3 is a schematic diagram of the exploded structure of the speaker 100 shown in Fig. 2 in some embodiments.

[0068] As shown in Figures 2 and 3, speaker 100 may include a housing 10, a vibration system 20, a magnetic circuit system 30, a support member 40, an adjustment system 50, a first magnetic conductive sheet 60, and a second magnetic conductive sheet 70. The vibration system 20 may include a diaphragm 21 and a voice coil 22. The magnetic circuit system 30 may include a central magnetic circuit 31 and a side magnetic circuit 32. In some embodiments, speaker 100 may not include the first magnetic conductive sheet 60 and / or the second magnetic conductive sheet 70.

[0069] For example, the vibration system 20 can be spaced apart from the magnetic circuit system 30. The magnetic circuit system 30 can have a magnetic gap 33. At least a portion of the voice coil 22 can be located in the magnetic gap 33. When current is input into the voice coil 22, the voice coil 22 can be affected by the magnetic field force of the magnetic circuit system 30, generating an Ampere force parallel to the thickness direction of the diaphragm 21 and moving along this direction to cut the magnetic flux lines. The voice coil 22 can push the diaphragm 21 to move back and forth along this direction. In other words, the diaphragm 21 can vibrate under the action of the voice coil 22.

[0070] It is understandable that when the diaphragm 21 vibrates, the elastic restoring force of the vibration system 20 itself will suppress the vibration of the diaphragm 21, resulting in a higher resonant frequency F0 of the speaker 100 and poor low-frequency performance of the speaker 100. In this embodiment, an adjustment system 50 is provided. The adjustment system 50 can generate a force on the vibration system 20, and the direction of this force is opposite to the direction of the elastic restoring force of the vibration system 20 itself. This can offset at least part of the elastic restoring force of the vibration system 20 and reduce the impact of the elastic restoring force on the low-frequency performance of the speaker 100. The specific structure of the speaker 100 and how the adjustment system 50 improves the low-frequency performance of the speaker 100 will be described in detail below with reference to the relevant drawings.

[0071] Figure 4 is a schematic diagram of the exploded structure of the magnetic circuit system 30 and the first magnetic conductive sheet 60 shown in Figure 3. Figure 5 is a schematic diagram of the assembled structure of the structure shown in Figure 4. Figure 6 is a schematic diagram of a partial cross-section of the loudspeaker 100 shown in Figure 2 taken along line AA in one embodiment.

[0072] As shown in Figures 4 to 6, the side magnetic circuit 32 can be arranged around the intermediate magnetic circuit 31 and spaced apart from the intermediate magnetic circuit 31. In this case, a magnetic gap 33 of the magnetic circuit system 30 is formed between the intermediate magnetic circuit 31 and the side magnetic circuit 32. The side magnetic circuit 32 can include a plurality of spaced-apart sub-magnetic circuits. The plurality of spaced-apart sub-magnetic circuits can spaced apart and surround the intermediate magnetic circuit 31. In other embodiments, the side magnetic circuit 32 can also be roughly annular. In this case, the side magnetic circuit 32 can be arranged to completely surround the intermediate magnetic circuit 31.

[0073] Exemplarily, the intermediate magnetic circuit 31 may include an intermediate magnet 311 and an intermediate magnetic conductor 312. The intermediate magnetic conductor 312 may be fixedly connected to the surface of the intermediate magnet 311. The side magnetic circuit 32 may include a side magnet 321 and a side magnetic conductor 322. The side magnetic conductor 322 may be fixedly connected to the surface of the side magnet 321. The materials of the intermediate magnet 311 and the side magnet 321 may both be hard magnetic materials, also known as permanent magnetic materials (permanent magnets) or permanent magnetic materials (permanent magnets), that is, the intermediate magnet 311 and the side magnet 321 may both be permanent magnets. It is understood that hard magnetic materials are permanent magnetic materials that can retain magnetism for a long time. For example, magnets, etc. The materials of the intermediate magnetic conductor 312 and the side magnetic conductor 322 may both be magnetic conductive materials.

[0074] Exemplarily, the side magnets 321 may be arranged around the middle magnet 311 and spaced apart from the middle magnet 311. Specifically, the side magnets 321 may include a plurality of small magnets. The plurality of small magnets may be spaced apart around the outer peripheral side of the middle magnet 311. The side conductive magnets 322 may be roughly annular. The side conductive magnets 322 may be fixedly connected to the surface of the same side of the plurality of small magnets. In some embodiments, the side magnets 321 may also be roughly annular. In this case, the side magnets 321 may be arranged to completely surround the outer peripheral side of the middle magnet 311.

[0075] For example, the intermediate magnetic circuit 31 may be provided with a bypass hole 313. The bypass hole 313 may be spaced apart from the magnetic gap 33 of the magnetic circuit system 30. The intermediate magnet 311 may be provided with a first hole 311a. The intermediate magnet 311 may be generally annular. The intermediate magnetic conductor 312 may be provided with a second hole 312a. The intermediate magnetic conductor 312 may be generally annular. The first hole 311a may be connected to the second hole 312a. The first hole 311a and the second hole 312a may together constitute the bypass hole 313 of the intermediate magnetic circuit 31.

[0076] For example, the first magnetic conductive sheet 60 can be fixedly connected to the surface of the middle magnet 311 facing away from the middle magnetic conductor 312, and the surface of the side magnet 321 facing away from the side magnetic conductor 322. A portion of the first magnetic conductor can be exposed relative to the avoidance hole 313 of the middle magnetic circuit 31. A portion of the first magnetic conductive sheet 60 can also be exposed relative to the magnetic gap 33 between the middle magnetic circuit 31 and the side magnetic circuit 32.

[0077] Figure 7 is a schematic diagram of the exploded structure of the vibration system 20 shown in Figure 3. Figure 8 is a schematic diagram of the assembled structure of the structure shown in Figure 7. Figure 9 is a schematic diagram of a partial cross-section of the loudspeaker 100 shown in Figure 2 taken along line AA in one embodiment.

[0078] As shown in Figures 7 to 9, the diaphragm 21 can be a flat diaphragm or a diaphragm with a folded ring structure. For example, the diaphragm 21 can be a diaphragm with a folded ring structure. The diaphragm 21 can include a vibrating portion 211 and a folded ring portion 212. The folded ring portion 212 can be fixedly connected to the outer periphery of the vibrating portion 211. At least a portion of the folded ring portion 212 can be arched toward one side of the diaphragm 21 to form a folded ring structure. It should be understood that the outer periphery of the vibrating portion 211 can be the outer peripheral side surface of the vibrating portion 211, or it can be the portion of the vibrating portion 211 close to its outer peripheral side surface. In this embodiment, the outer periphery of the vibrating portion 211 can be the portion of the vibrating portion 211 close to its outer peripheral side surface. The vibrating portion 211 and the folded ring portion 212 can be separate structures. In other embodiments, the outer periphery of the vibrating portion 211 can also be the outer peripheral side surface of the vibrating portion 211. That is, the folded ring portion 212 can be fixedly connected to the outer peripheral side surface of the vibrating portion 211. In some embodiments, the vibration portion 211 and the folding ring portion 212 may be integrally formed, that is, the diaphragm 21 may be an integrally formed structure.

[0079] For example, the voice coil 22 can have a roughly annular structure. The voice coil 22 can be fixedly connected to the vibration portion 211 of the diaphragm 21. The folded ring portion 212 can be arched along the side facing the voice coil 22. In some embodiments, the vibration system 20 can further include a connecting bracket 23. One end of the connecting bracket 23 can be fixedly connected to the surface of the voice coil 22 facing the diaphragm 21. The other end of the connecting bracket 23 can be fixedly connected to the diaphragm 21. In other words, the folded ring portion 212 of the diaphragm 21 can be indirectly connected to the vibration portion 211 of the diaphragm 21 via the connecting bracket 23.

[0080] Figure 10 is a schematic diagram of the exploded structure of the vibration system 20, magnetic circuit system 30, and support member 40 shown in Figure 3. Figure 11 is a schematic diagram of the assembled structure of the structure shown in Figure 10. Figure 12 is a schematic diagram of a partial cross-section of the loudspeaker 100 shown in Figure 2 taken along line AA in one embodiment.

[0081] As shown in Figures 10 to 12, the vibration system 20 and the magnetic circuit system 30 can be respectively located on opposite sides of the support member 40 and fixedly connected to the support member 40. The support member 40 can be roughly annular. The folding ring portion 212 of the diaphragm 21 of the vibration system 20 can be fixedly connected to the support member 40. The voice coil 22 can be located in the annular space of the support member 40. The surface of the support member 40 facing away from the diaphragm 21 can be fixedly connected to the magnetic circuit system 30. At this time, at least part of the voice coil 22 can be located in the magnetic gap 33 of the magnetic circuit system 30. At this time, the first magnetic conductive sheet 60 can be located on the side of the magnetic circuit system 30 facing away from the diaphragm 21.

[0082] In some embodiments, the speaker 100 may further include an electrical connector (not shown). One end of the electrical connector may be electrically connected to the voice coil 22, and the other end may be electrically connected to an external device of the speaker 100 (e.g., a battery of an electronic device). In this way, the external device of the speaker 100 may transmit a current signal to the voice coil 22 via the electrical connector. The electrical connector may be a device capable of transmitting current signals, such as a wire or a circuit board.

[0083] Fig. 13 is a schematic diagram of a cross-sectional structure of the loudspeaker 100 shown in Fig. 2 taken along line AA. Fig. 14 is a schematic diagram of a cross-sectional structure of the structure shown in Fig. 13 after the housing 10 is hidden.

[0084] As shown in Figures 13 and 14 , the housing 10 may include a frame 11 and a bottom 12. The frame 11 may be fixedly connected to the outer periphery of the bottom 12. The frame 11 and the bottom 12 may enclose an inner cavity 13 of the housing 10. Figure 3 also schematically illustrates the frame 11 and the bottom 12 of the housing 10.

[0085] For example, the vibration system 20 can be fixedly connected to the frame 11 of the housing 10. The folding ring portion 212 of the diaphragm 21 can be fixedly connected to the inner circumferential side of the frame 11. In this case, the diaphragm 21 can separate the inner cavity 13 of the housing 10 into a front cavity 13a and a rear cavity 13b that are not connected to each other. The front cavity 13a can be located on the side of the diaphragm 21 facing away from the voice coil 22. The rear cavity 13b can be located on the side of the diaphragm 21 facing the voice coil 22.

[0086] Exemplarily, the first magnetic conductive sheet 60 can be fixedly connected to the bottom 12 of the housing 10. In this case, the magnetic circuit system 30 can be located in the rear cavity 13b of the housing 10. In some embodiments, the bottom 12 can also be provided with a first mounting hole 121 (FIG. 3 also illustrates the first mounting hole 121 of the bottom 12). The first magnetic conductive sheet 60 can be fixed to the first mounting hole 121. In this way, the first magnetic conductive sheet 60 can utilize the thickness of the bottom 12 of the housing 10, which is conducive to reducing the overall thickness of the speaker 100.

[0087] Exemplarily, the frame portion 11 of the shell 10 may be provided with a second mounting hole 111. The projection of the second mounting hole 111 in the thickness direction of the diaphragm 21 may cover the avoidance hole 313 of the intermediate magnetic circuit 31. The second magnetic conductive sheet 70 may be located in the second mounting hole 111 and fixedly connected to the frame portion 11 of the shell 10. In this way, by providing the second mounting hole 111 and arranging the second magnetic conductive sheet 70 in the second mounting hole 111, the second mounting hole 111 can utilize the thickness of the shell 10 itself, which is conducive to reducing the overall thickness of the speaker 100. In some embodiments, the shell 10 may not be provided with the second mounting hole 111. The second magnetic conductive sheet 70 may also be directly fixed to the surface of the shell 10 facing the avoidance hole 313.

[0088] Exemplarily, the vibrating portion 211 of the diaphragm 21 may include a first portion 211a, a second portion 211b, and a third portion 211c. The first portion 211a may be closer to the avoidance hole 313 of the intermediate magnetic circuit 31 relative to the second portion 211b. In the thickness direction of the diaphragm 21, the distance from the second portion 211b to the second magnetic portion 53 may be greater than the distance from the first portion 211a of the diaphragm 21 to the second magnetic portion 53. The third portion 211c may be connected between the first portion 211a and the second portion 211b. The second portion 211b and the third portion 211c may both be roughly annular. The third portion 211c may connect the inner periphery of the second portion 211b and the outer periphery of the first portion 211a. At this time, the first portion 211a, the second portion 211b, and the third portion 211c may together enclose a sunken space 213. The projection of the first portion 211a on the intermediate magnetic circuit 31 may be located within the avoidance hole 313. It should be understood that although the vibration portion 211 of the diaphragm 21 is described as being divided into three parts in this embodiment, this does not affect the fact that the vibration portion 211 of the diaphragm 21 is an integrally formed structure. That is, the first portion 211a, the second portion 211b, and the third portion 211c of the vibration portion 211 can be integrally formed. For example, the vibration portion 211 of the diaphragm 21 can be manufactured by stamping, stretching, or the like.

[0089] Exemplarily, the adjustment system 50 may include a first magnetic part 51, a magnetic part 52 and a second magnetic part 53. The first magnetic part 51 may be fixedly connected to the surface of the first part 211a of the second magnetic conductive sheet 70 facing the diaphragm 21. The second magnetic part 53 may be located in the avoidance hole 313 of the magnetic part 52 and fixedly connected to the first magnetic conductive sheet 60. The magnetic part 52 may be fixedly connected to the first part 211a of the vibration part 211. The magnetic part 52 may be located in the sinking space 213. That is, the magnetic part 52 may be fixedly connected to the surface of the first part 211a facing away from the avoidance hole 313. In the thickness direction of the diaphragm 21, the distance from the magnetic part 52 to the first magnetic part 51 is a first distance D1. The distance from the magnetic part 52 to the second magnetic part 53 is a second distance D2.

[0090] Exemplarily, the material of the magnetic attraction portion 52 can be a soft magnetic material, that is, the magnetic attraction portion 52 can be a soft magnet. It can be understood that soft magnetic materials are magnetic materials that are easy to magnetize and easy to demagnetize, such as soft iron. The materials of the first magnetic portion 51 and the second magnetic portion 53 can both be hard magnetic materials, that is, the first magnetic portion 51 and the second magnetic portion 53 can be permanent magnets. Among them, the polarization direction of the first magnetic portion 51 can be parallel to the thickness direction of the diaphragm 21. The polarization direction of the second magnetic portion 53 can be parallel to the thickness direction of the diaphragm 21. The polarization direction of the first magnetic portion 51 can be opposite to the polarization direction of the second magnetic portion 53.

[0091] Exemplarily, both the first magnetic portion 51 and the second magnetic portion 53 may include multiple small permanent magnets. For example, the first magnetic portion 51 may include a first center magnet 511 and two first side magnets 512. The second magnetic portion 53 may include a second center magnet 531 and two second side magnets 532. In this embodiment, taking the first magnetic portion 51 as an example, the polarization direction of the first center magnet 511 of the first magnetic portion 51 may be parallel to the thickness direction of the diaphragm 21. The polarity of the end of the first center magnet 511 of the first magnetic portion 51 facing the diaphragm 21 may be an S pole, and the polarity of the end of the first center magnet 511 of the first magnetic portion 51 facing away from the diaphragm 21 may be an N pole. The polarization directions of the two first side magnets 512 of the first magnetic portion 51 may be the same and opposite to the polarization direction of the first center magnet 511. In other words, the polarity of the end of the first side magnet 512 of the first magnetic portion 51 facing the diaphragm 21 may be an N pole. The overall polarization direction of the first magnetic portion 51 can be parallel to the thickness direction of the diaphragm 21. The magnetic circuit arrangement of the second magnetic portion 53 can be mirror-symmetrical with the magnetic circuit arrangement of the first magnetic portion 51 about the plane where the magnetic attraction portion 52 is located. In this case, the overall polarization direction of the second magnetic portion 53 can be parallel to the thickness direction of the diaphragm 21 and opposite to the polarization direction of the first magnetic portion 51. A force can be generated between the first magnetic portion 51 and the second magnetic portion 53, and this force can be a repulsive force.

[0092] It should be understood that FIG14 and subsequent figures illustrate only one embodiment of the magnetic circuit arrangement of the first magnetic portion 51 and the second magnetic portion 53 of the adjustment system 50. The first magnetic portion 51 and the second magnetic portion 53 may also adopt other magnetic circuit arrangements, such as a Halbach array, etc., which is not specifically limited in this application.

[0093] Figure 15a is a simplified schematic diagram of a portion of the structure shown in Figure 14 when the voice coil 22 is in a balanced position. Figure 15b is a schematic diagram of a magnetic field simulation of a portion of the structure shown in Figure 14 when the voice coil 22 is in a balanced position.

[0094] As shown in Figures 15a and 15b, the magnetic part 52 of the adjustment system 50 can be subjected to an attraction force from the first magnetic part 51 and an attraction force from the second magnetic part 53. Among them, the attraction force from the first magnetic part 51 that the magnetic part 52 is subjected to is a first attraction force. The direction of the first attraction force is a first direction. The first direction can be the direction in which the magnetic part 52 points to the first magnetic part 51. The first direction can be parallel to the thickness direction of the diaphragm 21. The attraction force from the second magnetic part 53 that the magnetic part 52 is subjected to is a second attraction force. The direction of the second attraction force is a second direction. The second direction can be the direction in which the magnetic part 52 points to the first magnetic part 51. The second direction can be parallel to the thickness direction of the diaphragm 21. In other words, the first direction can be opposite to the second direction.

[0095] When no current is input to the voice coil 22 and the voice coil 22 is in a balanced position, the diaphragm 21 does not deform. At this time, the elastic restoring force of the vibration system 20 itself is 0. The distance from the magnetic attraction part 52 of the adjustment system 50 to the first magnetic part 51 (also known as the first distance D1 in this embodiment) and the distance from the magnetic attraction part 52 to the second magnetic part 53 (also known as the second distance D2 in this embodiment) can be equal. Here, equality can be completely equal or approximately equal, and the error between the first distance D1 and the second distance D2 can be within a certain range, for example, the error between the first distance D1 and the second distance D2 can be within 0.1 mm. At this time, the first attraction force and the second attraction force exerted on the magnetic attraction part 52 are equal in magnitude and opposite in direction. That is, the first attraction force and the second attraction force can offset each other. The force exerted by the first magnetic part 51 and the second magnetic part 53 on the magnetic attraction part 52 can be 0. At this time, the force exerted by the adjustment system 50 on the vibration system 20 can be 0.

[0096] Figure 16a is a simplified schematic diagram of a portion of the structure shown in Figure 14 at one moment when the first current is input to the voice coil 22. Figure 16b is a schematic diagram of a magnetic field simulation of a portion of the structure shown in Figure 14 at one moment when the first current is input to the voice coil 22.

[0097] As shown in Figures 16a and 16b, when the voice coil 22 is input with a first current, the voice coil 22 can move in the first direction, pushing the diaphragm 21 to move in the first direction. At this time, the magnetic portion 52 can move along with the diaphragm 21 in the first direction. As the displacement of the magnetic portion 52 in the first direction gradually increases, the first distance D1 between the magnetic portion 52 and the first magnetic portion 51 can gradually decrease, and the second distance D2 between the magnetic portion 52 and the second magnetic portion 53 can gradually increase. At the same time, the first attractive force exerted on the magnetic portion 52 can gradually increase, and the second attractive force exerted on the magnetic portion 52 can gradually decrease.

[0098] When the magnetic attraction portion 52 moves along the diaphragm 21 along the first direction to a first distance D1 that is less than the second distance D2, the diaphragm 21 may bulge along the first direction and deform. At this time, the vibration system 20 itself has an elastic restoring force to resist the vibration of the vibration system 20. The direction of the elastic restoring force is opposite to the direction of the bulge of the diaphragm 21 (in this embodiment, that is, the direction of the elastic restoring force of the vibration system 20 at this time is the second direction). The first attractive force exerted on the magnetic attraction portion 52 may be greater than the second attractive force exerted on the magnetic attraction portion 52. At this time, the direction of the total force exerted on the magnetic attraction portion 52 from the first magnetic portion 51 and the second magnetic portion 53 may be along the first direction. That is, the direction of the force exerted by the adjustment system 50 on the vibration system 20 may be along the first direction. The direction of the force exerted by the adjustment system 50 on the vibration system 20 is opposite to the direction of the elastic restoring force of the vibration system 20 itself.

[0099] Figure 17a is a simplified schematic diagram of a portion of the structure shown in Figure 14 at one moment when the second current is input to the voice coil 22. Figure 17b is a schematic diagram of a magnetic field simulation of a portion of the structure shown in Figure 14 at one moment when the second current is input to the voice coil 22.

[0100] As shown in Figures 17a and 17b, when the voice coil 22 is input with a second current, the voice coil 22 can move in the second direction and push the diaphragm 21 to move in the second direction. At this time, the magnetic portion 52 can move in the second direction along with the diaphragm 21. As the position of the magnetic portion 52 moving in the second direction gradually increases, the first distance D1 between the magnetic portion 52 and the first magnetic portion 51 can gradually increase, and the second distance D2 between the magnetic portion 52 and the second magnetic portion 53 can gradually decrease. At the same time, the first attractive force exerted on the magnetic portion 52 can gradually decrease, and the second attractive force exerted on the magnetic portion 52 can gradually increase.

[0101] When the magnetic attraction portion 52 moves along the second direction with the diaphragm 21 to a point where the first distance D1 is greater than the second distance D2, the diaphragm 21 may bulge along the second direction and deform. At this time, a portion of the sinking space 213 of the diaphragm 21 may be located within the avoidance hole 313 (see FIG14 ). The vibration system 20 itself has an elastic restoring force for resisting the vibration of the vibration system 20. The direction of the elastic restoring force is opposite to the direction in which the diaphragm 21 bulges (in this embodiment, the direction of the elastic restoring force of the vibration system 20 is the first direction at this time). The first attractive force received by the magnetic attraction portion 52 may be smaller than the second attractive force received by the magnetic attraction portion 52. At this time, the direction of the total force received by the magnetic attraction portion 52 from the first magnetic portion 51 and the second magnetic portion 53 may be along the second direction. That is, the direction of the force exerted by the adjustment system 50 on the vibration system 20 may be along the second direction. The direction of the force exerted by the adjustment system 50 on the vibration system 20 is opposite to the direction of the elastic restoring force of the vibration system 20 itself.

[0102] Figure 18 is a schematic diagram showing the simulation curves of the displacement of the voice coil 22 of the loudspeaker 100 shown in Figure 14 and the force exerted by the adjustment system 50 on the vibration system 20. Figure 19 is a schematic diagram showing the simulation curves of the displacement of the voice coil 22 of the loudspeaker 100 shown in Figure 14 and the total stiffness coefficient of the vibration system 20, compared with the simulation curves of the displacement of the voice coil of a conventional loudspeaker and the total stiffness coefficient of the vibration system. Figure 20 is a schematic diagram showing the simulation frequency response curves of the loudspeaker 100 shown in Figure 14 and a conventional loudspeaker. It should be noted that Curve 1 in Figure 20 is the frequency response curve of the loudspeaker 100 in this embodiment. Curve 2 is the frequency response curve of a conventional loudspeaker.

[0103] As shown in Figures 18 to 20, as the absolute value of the displacement of the voice coil 22 after the current is input increases, the absolute value of the total force exerted on the magnetic portion 52 of the adjustment system 50 from the first magnetic portion 51 and the second magnetic portion 53 also increases, causing the absolute value of the force exerted by the adjustment system 50 on the vibration system 20 to also increase. The displacement of the voice coil 22 and the force exerted by the adjustment system 50 on the vibration system 20 can be approximately linearly related. The force exerted by the adjustment system 50 on the vibration system 20 can be equivalent to an elastic component, and the spring coefficient of the elastic component can be Km. The direction of the elastic force of the elastic component (i.e., the force exerted by the adjustment system 50 on the vibration system 20 in this embodiment) is opposite to the direction of the elastic restoring force of the vibration system 20.

[0104] It is understandable that the resonant frequency F0 of a general loudspeaker can be:

[0105] Where Ks is the equivalent stiffness coefficient of the elastic restoring force of the vibration system in the loudspeaker. As can be seen from the above expression, the elastic restoring force of the vibration system will suppress the vibration of the diaphragm, resulting in a higher resonant frequency of the loudspeaker and poor low-frequency performance of the loudspeaker. By reducing the equivalent stiffness coefficient of the elastic restoring force by reducing the thickness of the diaphragm's folding ring structure or selecting a material with a lower Young's modulus to prepare the diaphragm's folding ring structure, the elastic restoring force of the vibration system itself can be reduced. However, the low equivalent stiffness coefficient of the vibration system will cause the voice coil to easily deflect or tilt during movement, that is, polarization will occur, making it easy for the voice coil to rub against the magnetic circuit system during movement, affecting the normal operation of the loudspeaker.

[0106] The speaker 100 in this embodiment includes an adjustment system 50. The magnetic portion 52 of the adjustment system 50 is fixed to the diaphragm 21. The first magnetic portion 51 and the second magnetic portion 53 of the adjustment system 50 are respectively fixed on opposite sides of the diaphragm 21. At least one of the first magnetic portion 51, the magnetic portion 52, and the second magnetic portion 53 of the adjustment system 50 is a permanent magnet. In the thickness direction of the diaphragm 21, the distance from the magnetic portion 52 to the first magnetic portion 51 can be equal to the distance from the magnetic portion 52 to the second magnetic portion 53. The magnetic portion 52 can simultaneously receive a first attractive force from the first magnetic portion 51 and a second attractive force from the second magnetic portion 53. The direction of the first attractive force is opposite to the direction of the second attractive force. As the absolute value of the displacement of the voice coil 22 relative to its equilibrium position increases, the absolute value of the total force acting on the magnetic portion 52 from the first magnetic portion 51 and the second magnetic portion 53 also increases, and the absolute value of the force acting on the vibration system 20 by the magnetic portion 52 also increases. The direction of the force exerted by the magnetic portion 52 on the vibration system 20 is opposite to the direction of the elastic restoring force of the vibration system 20 itself. Thus, the force exerted by the adjustment system 50 on the vibration system 20 (in this embodiment, the total force exerted on the magnetic portion 52 of the adjustment system 50 by the first magnetic portion 51 and the second magnetic portion 53) can be equivalent to an elastic component, and the spring constant of the elastic component can be Km. In this case, the resonant frequency F0 of the speaker 100 can be:

[0107] As can be seen from the above expression, the force exerted by the adjustment system 50 on the vibration system 20 in this embodiment can offset at least a portion of the elastic restoring force of the vibration system 20 in the speaker 100, thereby effectively reducing the impact of the elastic restoring force of the vibration system 20 on the vibration of the diaphragm 21. Thus, under the same conditions of the thickness and material of the diaphragm 21, the resonant frequency of the speaker 100 in this embodiment is lower, and the low-frequency performance of the speaker 100 is better. In other words, the speaker 100 in this embodiment can meet the rigidity requirements of the vibration system 20 while maintaining good low-frequency performance, and the swing of the voice coil 22 is reduced during movement.

[0108] Secondly, in this embodiment, the intermediate magnetic circuit 31 of the magnetic circuit system 30 has a relief hole 313 spaced apart from the magnetic gap 33 of the magnetic circuit system 30. The second magnetic portion 53 of the adjustment system 50 is located within the relief hole 313. Furthermore, the first portion 211a of the diaphragm 21 is positioned relative to the second portion 211b, near the relief hole 313. The third portion 211c of the diaphragm 21 is connected between the first portion 211a and the second portion 211b, and together with the first portion 211a, defines a recessed space 213. The projection of the first portion 211a onto the intermediate magnetic circuit 31 can be located within the relief hole 313. The magnetic portion 52 of the adjustment system 50 can be fixedly connected to the first portion 211a of the diaphragm 21. Thus, by providing the relief hole 313 in the magnetic portion 52 and cooperating with the recessed space 213 formed on the diaphragm 21, the adjustment system 50 can be positioned within the thickness of the magnetic circuit system 30, thereby reducing the overall thickness of the loudspeaker 100. In other words, the speaker 100 in this embodiment can achieve a thin configuration while having good low-frequency performance.

[0109] In addition, the speaker 100 in this embodiment further includes a first magnetic conductive sheet 60. The first magnetic conductive sheet 60 can be fixedly connected to the surface of the magnetic circuit system 30 facing away from the diaphragm 21. The second magnetic portion 53 of the adjustment system 50 can be fixedly connected to the first magnetic conductive sheet 60. Thus, under the condition that the size of the second magnetic portion 53 is the same, the provision of the first magnetic conductive sheet 60 in this embodiment can increase the magnetic induction intensity between the second magnetic portion 53 and the magnetic attraction portion 52, thereby increasing the force between the second magnetic portion 53 and the magnetic attraction portion 52, thereby increasing the force exerted by the adjustment system 50 on the vibration system 20, thereby better offsetting the elastic restoring force of the vibration system 20 during movement, and facilitating improved low-frequency performance of the speaker 100. Under the condition that the force between the second magnetic portion 53 and the magnetic attraction portion 52 is the same, the provision of the first magnetic conductive sheet 60 in this embodiment can increase the magnetic induction intensity between the second magnetic portion 53 and the magnetic attraction portion 52, thereby effectively reducing the thickness of the second magnetic portion 53 itself, facilitating a thinner design of the speaker 100.

[0110] In addition, the rear cavity 13b of the loudspeaker 100 in this embodiment can also be a closed space. In this case, the resonant frequency F0 of the loudspeaker 100 can be:

[0111] Wherein, Kb is the equivalent stiffness coefficient of the air in the rear cavity 13b of the loudspeaker 100 and satisfies:

[0112] Where ρ is the air density, C is the air speed of sound, Sd is the vibration area of ​​the loudspeaker 100, and V is the volume of the rear cavity 13b. As can be seen from the above expression, the air in the rear cavity 13b can be equivalent to an elastic component. The air in the rear cavity 13b can generate an equivalent elastic force, and the direction of this elastic force is the same as the direction of the elastic restoring force of the vibration system 20 itself. The loudspeaker 100 in this embodiment is provided with an adjustment system 50. The adjustment system 50 exerts a force on the vibration system 20 in the opposite direction of the force exerted by the vibration system 20 itself. This can offset at least part of the equivalent elastic force of the air in the rear cavity 13b of the loudspeaker 100, thereby reducing the effect of the equivalent elastic force of the air in the rear cavity 13b on the movement of the diaphragm 21. Thus, under the conditions that the size of the loudspeaker 100 is the same and the volume of the rear cavity 13b of the loudspeaker 100 is the same, the resonant frequency F0 of the loudspeaker 100 in this embodiment can be lower, and the low-frequency performance of the loudspeaker 100 is better. Under the condition of the same resonant frequency F0, the volume of the rear cavity 13b of the speaker 100 in this embodiment can be smaller, which is conducive to the miniaturization of the speaker 100. In other words, the speaker 100 in this embodiment can meet the requirements of miniaturization while having good low-frequency performance.

[0113] In some embodiments, the magnetic portion 52 may also be fixed to the surface of the first portion 211a of the diaphragm 21 facing away from the first magnetic portion 51. Thus, under the condition that the distance between the magnetic portion 52 and the first magnetic portion 51 remains the same, compared to when the magnetic portion 52 is fixed to the surface of the first portion 211a of the diaphragm 21 facing the first magnetic portion 51, the first portion 211a is sunken further relative to the second portion 211b. In other words, the sunken space 213 enclosed by the first portion 211a and the third portion 211c of the diaphragm 21 is larger, resulting in a greater amount of stretching during the manufacture of the diaphragm 21 and making the manufacture more difficult. In this embodiment, the magnetic portion 52 is fixed to the surface of the first portion 211a of the diaphragm 21 facing away from the first magnetic portion 51. This reduces the amount of depression of the first portion 211a relative to the second portion 211b. This also reduces the size of the depression space 213 enclosed by the first portion 211a and the third portion 211c of the diaphragm 21. This helps reduce the amount of stretching of the diaphragm 21, lowers the difficulty of manufacturing the diaphragm 21, and improves production efficiency and product yield. Furthermore, when the rear cavity 13b of the speaker 100 is a closed space, the magnetic portion 52 is fixed to the surface of the first portion 211a of the diaphragm 21 facing away from the first magnetic portion 51, allowing the magnetic portion 52 to be located within the rear cavity 13b of the speaker 100. This improves the waterproofing of the magnetic portion 52 and extends the service life of the speaker 100.

[0114] In some embodiments, the distance between the diaphragm 21 and the magnetic circuit system 30 can be greater than 0.12 mm. This provides a certain distance between the diaphragm 21 and the magnetic circuit system 30, thereby preventing the diaphragm 21 from rubbing against the magnetic circuit system 30 during vibration, thereby preventing noise from being emitted and affecting the acoustic performance of the speaker 100.

[0115] In some embodiments, the projection of the magnetic portion 52 of the adjustment system 50 on the plane where the diaphragm 21 is located can be symmetrically arranged about the center of the diaphragm 21. In this way, the force exerted by the magnetic portion 52 on the diaphragm 21 can act on the center of the diaphragm 21, thereby ensuring the torque balance of the vibration system 20 and preventing the force exerted by the magnetic portion 52 on the diaphragm 21 from deviating from the center of the diaphragm 21, causing the diaphragm 21 to deflect during vibration and affecting the normal operation of the speaker 100.

[0116] In some embodiments, the first magnetic portion 51 and the second magnetic portion 53 can be symmetrically arranged with respect to the magnetic attraction portion 52. In this way, the force between the first magnetic portion 51 and the magnetic attraction portion 52 and the force between the second magnetic portion 53 and the magnetic attraction portion 52 can be on the same straight line, thereby preventing the magnetic attraction portion 52 from being deflected by two forces on different straight lines, thereby preventing the normal movement of the diaphragm from being affected.

[0117] In some embodiments, as shown in FIG21a , the first magnetic portion 51 can also adopt a magnetic circuit setting of a Halbach array. The polarization direction of the first intermediate magnet 511 can be parallel to the thickness direction of the diaphragm 21. The polarization directions of the two first side magnets 512 can both be perpendicular to the polarization direction of the first intermediate magnet 511. The polarity of the portion of the first intermediate magnet 511 facing the magnetic attraction portion 52 can be an S pole. The polarity of the portion of the first side magnet 512 facing the first intermediate magnet 511 can be an S pole. In this way, by setting the magnetic circuit of the first magnetic portion 51 and / or the second magnetic portion 53 to a Halbach array, the magnetic energy of the first magnetic portion 51 can be effectively enhanced. Under the condition that the magnetic energy of the first magnetic portion 51 remains the same, the thickness of the first magnetic portion 51 can be reduced, thereby facilitating a thinner setting of the speaker 100. In other embodiments, the second magnetic portion 53 can also adopt a magnetic circuit setting of a Halbach array.

[0118] In some embodiments, as shown in Figure 21b, the second magnetic conductive sheet 70 may further include a main body portion 71 and an annular portion 72. The annular portion 72 may be fixedly connected to the outer periphery of the main body portion 71. At this time, the second magnetic conductive sheet 70 may be roughly bowl-shaped. The main body portion 71 may be located on the side of the first magnetic portion 51 facing away from the magnetic attraction portion 52, and may be fixedly connected to the first magnetic portion 51 and the shell 10. The annular portion 72 may be arranged around the first magnetic portion 51. In this way, the second magnetic conductive sheet 70 may semi-surround the first magnetic portion 51, thereby better enhancing the magnetic induction intensity between the first magnetic portion 51 and the magnetic attraction portion 52. Under the condition that the magnetic induction intensity between the first magnetic portion 51 and the magnetic attraction portion 52 is the same, the thickness of the first magnetic portion 51 in this embodiment may be thinner, which is conducive to achieving a thin setting of the speaker 100.

[0119] The structure of the loudspeaker 100 is introduced in detail above. Hereinafter, several different implementations of the adjustment system 50 will be introduced in detail with reference to the relevant drawings.

[0120] FIG. 22 is a simplified schematic diagram of the structure shown in FIG. 15 a in another embodiment.

[0121] As shown in Figure 22, the structure of the loudspeaker 100 in this embodiment is roughly the same as the structure shown in Figure 15a, and the identical parts will not be repeated. The differences between the two will be introduced below. In this embodiment, the first magnetic part 51 and the second magnetic part 53 can both be permanent magnets. The magnetic attraction part 52 can be a soft magnet. Among them, the polarization direction of the first magnetic part 51 and the polarization direction of the second magnetic part 53 can both be parallel to the thickness direction of the diaphragm 21. The polarity of the first end of the first magnetic part 51 and the polarity of the second end of the second magnetic part 53 can be opposite. That is, the polarization direction of the first magnetic part 51 and the polarization direction of the second magnetic part 53 can be the same. The part of the first magnetic part 51 facing the second magnetic part 53 can be attracted to the part of the second magnetic part 53 facing the first magnetic part 51. At this time, an attractive force can be generated between the first magnetic part 51 and the second magnetic part 53.

[0122] It can be understood that the first magnetic part 51 and the second magnetic part 53 of the loudspeaker 100 in this embodiment can both be permanent magnets. The polarization direction of the first magnetic part 51 and the polarization direction of the second magnetic part 53 can be the same, and both are parallel to the thickness direction of the diaphragm 21. That is, the part of the first magnetic part 51 facing the second magnetic part 53 can be attracted to the part of the second magnetic part 53 facing the first magnetic part 51. In this way, the force between the first magnetic part 51 and the second magnetic part 53 is an attractive force. Compared with the loudspeaker in which the force between the first magnetic part and the second magnetic part is a repulsive force, during its assembly process, due to the repulsive force generated between the first magnetic part and the second magnetic part, when the first magnetic part is installed after the second magnetic part is installed, the first magnetic part is fixed in the direction toward the second magnetic part and is subjected to a repulsive force from the second magnetic part. The direction of the repulsive force is opposite to the installation direction of the first magnetic part, thereby causing the first magnetic part to produce an assembly tolerance. In this embodiment, the acting force between the first magnetic part 51 and the second magnetic part 53 is an attractive force. When the first magnetic part 51 is fixed in the direction toward the second magnetic part 53, the direction of the attractive force between the first magnetic part 51 and the second magnetic part 53 is the same as the installation direction of the first magnetic part 51, thereby effectively avoiding the problem of assembly tolerance caused by the repulsive force from the second magnetic part 53 during the assembly process of the first magnetic part 51, which is beneficial to improving the product yield of the speaker 100.

[0123] In some embodiments, as shown in Figure 23, the first magnetic part 51, the second magnetic part 53 and the magnetic attraction part 52 can all be permanent magnets. The first magnetic part 51, the second magnetic part 53 and the magnetic attraction part 52 can all include a magnet. The polarization directions of the first magnetic part 51, the second magnetic part 53 and the magnetic attraction part 52 can be the same and all parallel to the thickness direction of the diaphragm 21. In this way, the magnetic induction intensity between the magnetic attraction part 52 and the first magnetic part 51 is large, and the magnetic induction intensity between the magnetic attraction part 52 and the second magnetic part 53 is also large. Under the condition that the magnetic induction intensity between the magnetic attraction part 52 and the first magnetic part 51 is the same, and the magnetic induction intensity between the magnetic attraction part 52 and the second magnetic part 53 is also the same, the thickness of the first magnetic part 51 and the second magnetic part 53 can be reduced, which is conducive to achieving a thin setting of the speaker 100. In other embodiments, as shown in Figure 24, the first magnetic part 51 and the second magnetic part 53 can also be soft magnets. The magnetic attraction part 52 can also be a permanent magnet.

[0124] In some embodiments, the speaker 100 may further include a first gasket (not shown) and a second gasket (not shown). Both the first gasket and the second gasket may be made of non-magnetic materials such as foam. The first gasket may be fixed to the surface of the first magnetic portion 51 facing the magnetic portion 52. The second gasket may be fixed to the surface of the second magnetic portion 53 facing the magnetic portion 52. It is understandable that by providing the first gasket between the first magnetic portion 51 and the magnetic portion 52, and providing the second gasket between the second magnetic portion 53 and the magnetic portion 52, it is possible to effectively avoid the problem that when the magnetic portion 52 moves closer to the first magnetic portion 51 or the second magnetic portion 53, the attraction between the two is too large, causing the magnetic portion 52 to be adsorbed on the first magnetic portion 51 or the second magnetic portion 53, thereby affecting the normal operation of the speaker 100. In some other embodiments, the first gasket may also be fixed to the surface of the magnetic portion 52 facing the first magnetic portion 51. The second gasket may also be fixed to the surface of the magnetic portion 52 facing the second magnetic portion 53.

[0125] FIG. 25 is a simplified schematic diagram of the structure shown in FIG. 15 a in yet another embodiment.

[0126] As shown in FIG25 , the structure of the speaker 100 in this embodiment is substantially the same as that shown in FIG15 a , and the common parts will not be further described. The differences between the two will be described below. In this embodiment, the two first side magnets 512 of the first magnetic portion 51 can be located on opposite sides of the first center magnet 511 and spaced apart from the first center magnet 511. In this case, a first gap 513 can be formed between the first center magnet 511 and the first side magnets 512. The second magnetic portion 53 can be mirror-symmetrical with the first magnetic portion 51 relative to the plane where the center magnet 311 is located. In this case, the second magnetic portion 53 can have a second gap 533. The projection of the first gap 513 along the thickness direction of the diaphragm 21 can overlap the second gap 533. The magnetic portion 52 can be provided with at least one through-hole 521. The projection of the first gap 513 along the thickness direction of the diaphragm 21 onto the magnetic portion 52 can be spaced apart from the through-hole 521. The projection of the second gap 533 along the thickness direction of the diaphragm 21 onto the magnetic portion 52 can be spaced apart from the through-hole 521.

[0127] It is understood that in this embodiment, a first gap 513 is provided between the first middle magnet 511 and the first side magnet 512 of the first magnetic portion 51. The magnetic induction intensity of the first magnetic portion 51 near the first gap 513 is relatively strong. The magnetic portion 52 has at least one through hole 521, and the projection of the first gap 513 of the first magnetic portion 51 on the magnetic portion 52 along the thickness direction of the diaphragm 21 can be spaced apart from the through hole 521. In this way, the through hole 521 of the magnetic portion 52 can avoid the area of ​​the first magnetic portion 51 where the magnetic induction intensity is relatively strong. That is, the magnetic portion 52 itself can be located in the area of ​​the first magnetic portion 51 where the magnetic induction intensity is relatively strong. This can ensure the force between the first magnetic portion 51 and the magnetic portion 52 while reducing the mass of the magnetic portion 52, thereby reducing the influence of the magnetic portion 52 on the vibration of the diaphragm 21. In addition, the overall mass of the speaker 100 is relatively light, which is conducive to achieving a lightweight setting of the speaker 100.

[0128] In other embodiments, the magnetic attraction portion 52 may further include a plurality of small magnets spaced apart from each other. The small magnets may be soft magnets or permanent magnets. The gap between two adjacent small magnets may constitute at least a portion of the through hole 521 of the magnetic attraction portion 52.

[0129] It should be noted that, in the absence of conflict, the 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.

[0130] 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.

[0131] The above are only some of the embodiments of this application, and 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 (100), characterized in that: The invention comprises a shell (10), a magnetic circuit system (30), a vibration system (20), and an adjustment system (50); the magnetic circuit system (30) is fixed to the shell (10); the magnetic circuit system (30) comprises an intermediate magnetic circuit (31) and a side magnetic circuit (32); the intermediate magnetic circuit (31) and the side magnetic circuit (32) are arranged at intervals; a magnetic gap (33) is formed between the intermediate magnetic circuit (31) and the side magnetic circuit (32); the intermediate magnetic circuit (31) is provided with an avoidance hole (313); and the avoidance hole (313) and the magnetic gap (33) are arranged at intervals; The vibration system (20) comprises a diaphragm (21) and a voice coil (22); the diaphragm (21) is fixed to the housing (10) and spaced apart from the magnetic circuit system (30); the voice coil (22) is fixedly connected to the diaphragm (21); at least a portion of the voice coil (22) is located in the magnetic gap (33); the diaphragm (21) comprises a first portion (211a), a second portion (211b), and a third portion (211c); the third portion (211c) is connected between the first portion (211a) and the second portion (211b); The adjustment system (50) comprises a first magnetic part (51), a magnetic attraction part (52) and a second magnetic part (53); the first magnetic part (51) and the second magnetic part (53) are respectively located on two opposite sides of the diaphragm (21) and are fixed relative to the housing (10); the second magnetic part (53) is located in the avoidance hole (313); and the magnetic attraction part (52) is fixedly connected to the first part (211a); In the thickness direction of the diaphragm (21), the distance from the magnetic attraction portion (52) to the first magnetic portion (51) is equal to the distance from the magnetic attraction portion (52) to the second magnetic portion (53); the distance from the first portion (211a) to the second magnetic portion (53) is smaller than the distance from the second portion (211b) to the second magnetic portion (53); the first portion (211a) and the third portion (211c) enclose a sinking space (213); and the projection of the first portion (211a) on the intermediate magnetic circuit (31) is located within the avoidance hole (313); At least one of the first magnetic part (51), the magnetic attraction part (52) and the second magnetic part (53) is a permanent magnet; the first magnetic part (51) generates an attractive force with the magnetic attraction part (52); and the second magnetic part (53) generates an attractive force with the magnetic attraction part (52).

2. The loudspeaker (100) according to claim 1, characterized in that The distance between the first part (211a) and the second magnetic part (53) is greater than 0.12 mm, and the distance between the third part (211a) and the magnetic circuit system (30) is greater than 0.12 mm.

3. The loudspeaker (100) according to claim 1 or 2, characterized in that: The loudspeaker (100) further comprises a first magnetic conductive sheet (60), wherein the first magnetic conductive sheet (60) is fixedly connected to a surface of the magnetic circuit system (30) facing away from the diaphragm (21) and the housing (10), the avoidance hole (313) exposes at least a portion of the first magnetic conductive sheet (60), and the second magnetic portion (53) is fixedly connected to the first magnetic conductive sheet (60).

4. The loudspeaker (100) according to any one of claims 1 to 3, characterized in that: The loudspeaker (100) further comprises a second magnetic conductive sheet (70), at least a portion of which is located on a side of the first magnetic portion (51) facing away from the magnetic attraction portion (52), and is fixedly connected to the first magnetic portion (51) and the housing (10).

5. The loudspeaker (100) according to claim 4, characterized in that: The second magnetic conductive sheet (70) comprises a main body (71) and an annular portion (72), wherein the annular portion (72) is connected to the outer periphery of the main body (71), the main body (71) is located on the side of the first magnetic portion (51) facing away from the magnetic attraction portion (52), and is fixedly connected to the first magnetic portion (51) and the shell (10), and the annular portion (72) is arranged around the first magnetic portion (51).

6. The loudspeaker (100) according to any one of claims 1 to 5, characterized in that: The magnetic attraction portion (52) is fixedly connected to the surface of the first portion (211a) facing the avoidance hole (313).

7. The loudspeaker (100) according to any one of claims 1 to 6, characterized in that: The first magnetic part (51) and the second magnetic part (53) are both permanent magnets, and the part of the first magnetic part (51) facing the second magnetic part (53) and the part of the second magnetic part (53) facing the first magnetic part (51) are attracted to each other.

8. The loudspeaker (100) according to claim 7, characterized in that: The magnetic attraction portion (52) is a soft magnet; Alternatively, the magnetic attraction portion (52) is a permanent magnet, and a portion of the magnetic attraction portion (52) facing the first magnetic portion (51) attracts a portion of the first magnetic portion (51) facing the magnetic attraction portion (52).

9. The loudspeaker (100) according to claim 7 or 8, characterized in that: The loudspeaker (100) further comprises a first gasket, which is located between the first magnetic portion (51) and the magnetic attraction portion (52) and is fixedly connected to the first magnetic portion (51) or the magnetic attraction portion (52).

10. The loudspeaker (100) according to any one of claims 7 to 9, characterized in that: The first magnetic part (51) comprises a first middle magnet (511) and a first side magnet (512), and a first gap (513) is formed between the first middle magnet (511) and the first side magnet (512); The magnetic attraction portion (52) is provided with at least one through hole (521), and a projection of the first gap (513) on the magnetic attraction portion (52) along the thickness direction of the diaphragm (21) is arranged at a distance from the through hole (521).

11. The loudspeaker (100) according to any one of claims 1 to 10, characterized in that: The projection of the magnetic attraction portion (52) on the plane where the diaphragm (21) is located is arranged symmetrically with respect to the center of the diaphragm (21).

12. The loudspeaker (100) according to any one of claims 1 to 11, characterized in that: The first magnetic portion (51) and the second magnetic portion (53) are symmetrically arranged with respect to the magnetic attraction portion (52).

13. The loudspeaker (100) according to any one of claims 1 to 12, characterized in that: When no current is input to the voice coil (22), the force exerted by the regulating system (50) on the vibration system (20) is 0; when current is input to the voice coil (22), the direction of the force exerted by the regulating system (50) on the vibration system (20) is opposite to the direction of the elastic restoring force of the vibration system (20) itself.

14. An electronic device (1000), characterized in that: The invention comprises a device housing (200) and a loudspeaker (100) according to any one of claims 1 to 13, wherein the loudspeaker (100) is arranged in the device housing (200).

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