Patent Publication Number: US-2023156388-A1

Title: A speaker device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 17/662,082, filed on May 5, 2022, which is a continuation of U.S. patent application Ser. No. 17/169,604 (now U.S. Pat. No. 11,363,362), filed on Feb. 8, 2021, which is a continuation-in-part application of International Patent Application No. PCT/CN2019/102382, filed on Aug. 24, 2019, which claims priority of Chinese Patent Application No. 201910009909.6, filed on Jan. 5, 2019; U.S. patent application Ser. No. 17/169,604 is also a continuation-in-part application of U.S. patent application Ser. No. 16/922,965, filed on Jul. 7, 2020 (now U.S. Pat. No. 11,115,751), which is a continuation of International Patent Application No. PCT/CN2019/070545, filed on Jan. 5, 2019, which claims priority of Chinese Patent Application No. 201810624043.5, filed on Jun. 15, 2018; and U.S. patent application Ser. No. 17/169,604 is also a continuation-in-part application of U.S. patent application Ser. No. 17/078,276, filed on Oct. 23, 2020 (now U.S. Pat. No. 11,310,601), which is a continuation of International Patent Application No. PCT/CN2019/070548, filed on Jan. 5, 2019, which claims priority of Chinese Patent Application No. 201810623408.2, filed on Jun. 15, 2018. The contents of each of the above applications are hereby incorporated in their entireties by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to the field of speaker devices, and in particular, to a button of a speaker device. 
     BACKGROUND 
     A speaker assembly of a speaker device on the market may include a button and an auxiliary button to facilitate a user of the speaker device to perform corresponding functions. The user can implement corresponding functions (e.g., pausing/playing music, answering a call, etc.) through the button and the auxiliary button. However, the setting of the button or the auxiliary button may affect the working state of the speaker assembly. For example, the button may reduce the volume generated by the speaker assembly. 
     SUMMARY 
     According to an aspect of the present disclosure, a speaker device is provided. The speaker device may include a circuit housing, an ear hook, a rear hook, and a speaker assembly. The circuit housing may be configured to accommodate a control circuit or a battery. The ear hook may be connected to a first end of the circuit housing, and a first housing sheath may cover at least a portion of the ear hook. The rear hook may be connected to a second end of the circuit housing. A second housing sheath may cover at least a portion of the rear hook. The first housing sheath and the second housing sheath may cover at least a portion of an external surface of the circuit housing, from the first end of the circuit housing and the second end of the circuit housing, respectively, in a sleeved manner. The speaker assembly may be connected to an end of the ear hook. The speaker assembly may include a headphone core and a housing for accommodating the headphone core. The housing may include a housing panel facing a human body and a housing back opposite to the housing panel. The headphone core may cause the housing panel and the housing back to vibrate. A vibration of the housing panel may have a first phase, a vibration of the housing back may have a second phase, and an absolute value of a difference between the first phase and the second phase may be less than 60 degrees when a frequency of each of the vibration of the housing panel and the vibration of the housing back is between 2000 Hz and 3000 Hz. 
     In some embodiments, the circuit housing may include a first side wall, a second side wall, and an end wall, each two of the first side wall, the second side wall, and the end wall may be connected, and the first housing sheath and the second housing sheath may be connected on the first side wall and the second side wall, respectively. 
     In some embodiments, an inner surface of the first housing sheath or the second housing sheath corresponding to the first side wall may include at least one positioning protrusion, and a positioning groove may be disposed on an outer surface of the main side wall. The positioning groove may correspond to the at least one position protrusion. 
     In some embodiments, the at least one positioning protrusion may be arranged with a strip shape and arranged obliquely relative to the second side wall. 
     In some embodiments, a connection area of the first housing sheath and the second housing sheath on the first side wall and the second side wall may be inclined relative to the second side wall. 
     In some embodiments, an area of the circuit housing covered by one of the first housing sheath and the second housing sheath may be not less than an area of the circuit housing covered by the other one of the first housing sheath and the second housing sheath. 
     In some embodiments, the rear hook may further include a plug end facing to the circuit housing. The second housing sheath may sleeve at least a portion of the plug end. The circuit housing may include a socket facing to the rear hook. At least a portion of the plug end may be inserted into the socket. The plug end may include a slot, and the slot may be vertical to an insertion direction of the socket. A first side wall of the socket may include a first through hole corresponding to the slot. The speaker device may further include a fixing component. The fixing component may include two pins and a connection unit. The two pins may be parallel to each other, and the connection unit may be configured to connect the two pins. The two pins may pass through the first through hole from outside of the plug end and be inserted into the slot such that the plug end may be inserted into and fixed with the socket. 
     In some embodiments, a second side wall of the socket may be opposite to the first side wall of the socket. The second side wall of the socket may include a second through hole. The second through hole may be opposite to the first through hole. The two pins may pass through the slot and be inserted into the second through hole. 
     In some embodiments, the plug end may include a first plug unit and a second plug unit. A cross section area of the first plug unit may be greater than a cross section area of the second plug unit in a cross-sectional direction perpendicular to the insertion direction of plug end. The slot may be disposed on the second plug unit, and the second plug unit may be disposed in the socket. 
     In some embodiments, the first plug unit may include a first wiring groove disposed along the insertion direction of the socket. The second plug unit may include a second wiring groove, and the second wiring groove may be penetrated. A third wiring groove may be disposed on an inner side wall of the socket. A first end of the third wiring groove may be connected to the first wiring groove. A second end of the third wiring groove may be connected to the second wiring groove. The speaker device may further include a wire. The wire may pass through the first wiring groove, the third wiring groove, and the second wiring groove in sequence from the rear hook and be connected to the control circuit or the battery. 
     In some embodiments, the vibration of the housing panel may have a first amplitude, the vibration of the housing back may have a second amplitude, and a ratio of the first amplitude to the second amplitude may be within a range of 0.5 to 1.5. 
     In some embodiments, the vibration of the housing panel may generate a first sound leakage wave, the vibration of the housing back may generate a second sound leakage sound wave, and the first sound leakage wave and the second sound leakage wave may have an overlap, which may reduce an amplitude of the first sound leakage wave. 
     In some embodiments, the housing panel and one or more other components of the housing may be connected via at least one of a bonding connection, a snaping connection, a welding connection, or a threaded connection. 
     In some embodiments, at least one of the housing panel or the housing back may be made of fiber reinforced plastic material. 
     In some embodiments, the vibration caused by the headphone core may generate a driving force. The housing panel may be connected to the headphone core via a transmission connection mode. At least a portion of the housing panel may be connected or against the human body such that a sound is conducted. An area of the housing panel contacted or against the human body may include a normal line. A line where the driving force locates may be not parallel to the normal line. 
     In some embodiments, a positive direction of the line where the driving force locates may be set outwards the speaker device from the housing panel. A positive direction of the normal line may be set outwards the speaker device. An angle formed between the line where the driving force locates along the positive direction of the line and the normal line along the positive direction of the normal line may be an acute angle. 
     In some embodiments, the headphone core may include a coil and a magnetic circuit component. Axes of the coil and the magnetic circuit component may be not parallel to the normal line. The axes of the coil and the magnetic circuit component may be perpendicular to a radial plane of the coil or a radial plane of the magnetic circuit component. 
     In some embodiments, the driving force may have a component in a first quadrant and/or a third quadrant of an XOY plan coordinate system. The origin of the XOY plan coordinate system may be located on a contact surface between the speaker device and the human body. An X-axis of the XOY plan coordinate system may be parallel to a coronal axis of the human body. A Y-axis may be parallel to a sagittal axis of the human body. A positive direction of the X-axis may face outside of the human body. A positive direction of the Y-axis may face the front of the human body. 
     In some embodiments, the area of the housing panel connected or against the human body may include a plane or a quasi-plane. 
     In some embodiments, the headphone core may further include a magnetic circuit assembly. The magnetic circuit assembly may generate a first magnetic field. The magnetic circuit assembly may include a first magnetic element, a first magnetically conductive element, and at least one second magnetic element. The first magnetic element may generate a second magnetic field. The at least one second magnetic element may surround the first magnetic element. A magnetic gap may be formed between the first magnetic element and the at least one second magnetic element. An intensity of the first magnetic field in the magnetic gap may be greater than an intensity of the second magnetic field in the magnetic gap. 
     In some embodiments, the speaker device may further include a second magnetically conductive element and at least one third magnetic element. The at least one third magnetic element may be connected to the second magnetically conductive element and the at least one second magnetic element. 
     In some embodiments, the speaker device may further include at least one fourth magnetic element. The at least one fourth magnetic element may be disposed below the magnetic gap and connected to the first magnetic element and the second magnetically conductive element. 
     In some embodiments, the speaker device may further include at least one fifth magnetic element. The at least one fifth magnetic element may be connected to an upper surface of the first magnetically conductive element. 
     In some embodiments, the speaker device may further include a third magnetically conductive element. The third magnetically conductive element may be connected to an upper surface of the fifth magnetic element and configured to suppress field intensity leakage of the first magnetic field. 
     In some embodiments, the first magnetically conductive element may be connected to an upper surface of the first magnetic element. The second magnetically conductive element may include a bottom plate and a side wall. The first magnetic element may be connected to the bottom plate of the second magnetically conductive element. 
     In some embodiments, the speaker device may further include at least one conductive element. The at least one conductive element may be connected to at least one of the first magnetic element, the first magnetically conductive element, or the second magnetically conductive element. 
     Additional features will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and the accompanying drawings or may be learned by production or operation of the examples. The features of the present disclosure may be realized and attained by practice or use of various aspects of the methodologies, instrumentalities and combinations set forth in the detailed examples discussed below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure is further described in terms of exemplary embodiments. These exemplary embodiments are described in detail with reference to the drawings. These embodiments are non-limiting exemplary embodiments, in which like reference numerals represent similar structures throughout the several views of the drawings, and wherein: 
         FIG.  1    is a schematic diagram illustrating an exemplary speaker device according to some embodiments of the present disclosure; 
         FIG.  2    is a schematic diagram illustrating a speaker assembly of an exemplary speaker device according to some embodiments of the present disclosure; 
         FIG.  3    is a schematic structural diagram illustrating a speaker assembly of a speaker device according to some embodiments of the present disclosure; 
         FIG.  4    is a schematic diagram illustrating a distance h 1  according to some embodiments of the present disclosure; 
         FIG.  5    is a schematic diagram illustrating a distance h 2  according to some embodiments of the present disclosure; 
         FIG.  6    is a schematic diagram illustrating a distance h 3  according to some embodiments of the present disclosure; 
         FIG.  7    is a schematic diagram illustrating a cross-sectional view of a partial structure of an exemplary speaker assembly according to some embodiments of the present disclosure; 
         FIG.  8    is a schematic diagram illustrating a distance D 1  and a distance D 2  according to some embodiments the present disclosure; 
         FIG.  9    is a schematic diagram illustrating a distances  13  and a distance  14  according to some embodiments of the present disclosure; 
         FIG.  10    is a schematic diagram illustrating a longitudinal cross-sectional view of a speaker device according to some embodiments of the present disclosure; 
         FIG.  11    is a schematic diagram illustrating a longitudinal cross-sectional view of a speaker device according to some embodiments of the present disclosure; 
         FIG.  12    is a schematic diagram illustrating a longitudinal cross-sectional view of a speaker device according to some embodiments of the present disclosure; 
         FIG.  13    is a schematic diagram illustrating a longitudinal cross-sectional view of a speaker device according to some embodiments of the present disclosure; 
         FIG.  14    is a schematic diagram illustrating a housing of an exemplary speaker device according to some embodiments of the present disclosure; 
         FIG.  15    is a schematic diagram illustrating an application scenario and a structure of an exemplary speaker device according to some embodiments of the present disclosure; 
         FIG.  16    is a schematic diagram illustrating an exemplary angle direction according to some embodiments of the present disclosure; 
         FIG.  17    is a schematic diagram illustrating an exemplary speaker device acting on human skin or bones according to some embodiments of the present disclosure; 
         FIG.  18    is a schematic diagram illustrating a relationship between an angle and a relative displacement of an exemplary speaker device according to some embodiments of the present disclosure; 
         FIG.  19    is a schematic diagram illustrating a low frequency part of a frequency response curve of an exemplary speaker device corresponding to different angles  8  according to some embodiments of the present disclosure; 
         FIG.  20    is a schematic diagram illustrating a longitudinal cross-sectional of an exemplary speaker device according to some embodiments of the present disclosure; 
         FIG.  21    is a schematic diagram illustrating a longitudinal cross-sectional of an exemplary magnetic circuit assembly according to some embodiments of the present disclosure; 
         FIG.  22    is a schematic diagram illustrating a longitudinal cross-sectional of an exemplary magnetic circuit assembly according to some embodiments of the present disclosure; 
         FIG.  23    is a schematic diagram illustrating a longitudinal cross-sectional of an exemplary speaker device according to some embodiments of the present disclosure; 
         FIG.  24    is a schematic diagram illustrating a longitudinal cross-sectional of an exemplary speaker device according to some embodiments of the present disclosure; 
         FIG.  25    is a schematic diagram illustrating a longitudinal cross-sectional of an exemplary speaker device according to some embodiments of the present disclosure; 
         FIG.  26    is a schematic diagram illustrating a longitudinal cross-sectional of an exemplary magnetic circuit assembly according to some embodiments of the present disclosure; and 
         FIG.  27    is a schematic diagram illustrating an exemplary sound transmission through air conduction according to some embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     In order to illustrate the technical solutions related to the embodiments of the present disclosure, a brief introduction of the drawings referred to in the description of the embodiments is provided below. Obviously, drawings described below are only some examples or embodiments of the present disclosure. Those skilled in the art, without further creative efforts, may apply the present disclosure to other similar scenarios according to these drawings. It should be understood that the purposes of these illustrated embodiments are only provided to those skilled in the art to practice the application, and not intended to limit the scope of the present disclosure. Unless apparent from the locale or otherwise stated, like reference numerals represent similar structures or operations throughout the several views of the drawings. 
     As used in the disclosure and the appended claims, the singular forms “a,” “an,” and/or “the” may include plural forms unless the content clearly indicates otherwise. In general, the terms “comprise,” “comprises,” and/or “comprising,” “include,” “includes,” and/or “including,” merely prompt to include steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive listing. The methods or devices may also include other steps or elements. The term “based on” is “based at least in part on.” The term “one embodiment” means “at least one embodiment”. The term “another embodiment” means “at least one other embodiment”. Related definitions of other terms will be provided in the descriptions below. In the following, without loss of generality, the description of “speaker device” or “speaker” will be used when describing the speaker related technologies in the present disclosure. This description is only a form of speaker application. For a person of ordinary skill in the art, “speaker device”, “speaker”, or “earphone” can also be replaced with other similar words, such as “player”, “hearing aid”, or the like. In fact, various implementations in the present disclosure may be easily applied to other non-loudspeaker-type hearing devices. For example, for professionals in the field, after understanding the basic principles of the speaker device, multiple variations and modifications may be made on forms and details of the specific methods and steps for implementing the speaker device, in particular, an addition of ambient sound pickup and processing functions to the speaker device so as to enable the speaker device to function as a hearing aid, without departing from the principle. For example, a sound transmitter such as a microphone may pick up an ambient sound of the user/wearer, process the sound using a certain algorithm, and transmit the processed sound (or a generated electrical signal) to the user/wearer. That is, the speaker device may be modified and have the function of picking up ambient sound. The ambient sound may be processed and transmitted to the user/wearer through the speaker device, thereby implementing the function of a hearing aid. For example, the algorithm mentioned here may include a noise cancellation algorithm, an automatic gain control algorithm, an acoustic feedback suppression algorithm, a wide dynamic range compression algorithm, an active environment recognition algorithm, an active noise reduction algorithm, a directional processing algorithm, a tinnitus processing algorithm, a multi-channel wide dynamic range compression algorithm, an active howling suppression algorithm, a volume control algorithm, or the like, or any combination thereof. 
       FIG.  1    is a schematic diagram illustrating an exemplary speaker device according to some embodiments of the present disclosure.  FIG.  2    is a schematic diagram illustrating a speaker assembly of an exemplary speaker device according to some embodiments of the present disclosure. The speaker device  100  may transmit a sound to an auditory system of a user of the speaker device  100  via a bone conduction mode, an air conduction mode, or the like, or any combination thereof so that the user can hear the sound. In some embodiments, the speaker device  100  may include a supporting connector  10  and at least one speaker assembly  40  disposed on the supporting connector  10 . In some embodiments, the supporting connector  10  may include an ear hook  50 . Specifically, the supporting connector  10  may include two ear hooks  50  and a rear hook  30 , and the rear hook  30  may be connected to the two ear hooks  50  and disposed between the two ear hooks  50 . When the speaker device  100  is worn by the user, the two ear hooks  50  may correspond to the left ear and the right ear of the user, respectively, and the rear hook  30  may correspond to the back of the head of the user. The ear hook  50  may be configured to contact with the head of the user, and one or more contact points (e.g., one or more points located near a top point  25 ) of the ear hook  50  and the head of the user may include a vibration fulcrum of the speaker assembly  40  when the speaker assembly  40  vibrates. 
     In some embodiments, the vibration of the speaker assembly  40  may be regarded as a reciprocating swing movement. The top point  25  of the ear hook  50  may be regarded as a fixed point of the reciprocating swing movement, and a portion of the ear hook  50  between the top point  25  of the ear hook  50  and the speaker assembly  40  may be regarded as an arm of the reciprocating swing movement. The fixed point of the reciprocating swing movement may be regarded as the vibration fulcrum. In some embodiments, a swing amplitude (i.e., vibration acceleration) of the speaker assembly  40  may be a positive correlation with a volume generated by the speaker assembly  40 . A mass distribution of the speaker assembly  40  may affect the amplitude of the swing amplitude of the speaker assembly  40 , and further affect the volume generated by the speaker assembly  40 . 
     In some embodiments, the speaker assembly  40  may include a headphone core, a housing  20  configured to accommodate the headphone core, a speaker module (not shown in the figure), and at least one button  4   d . For example, the speaker module may include a first speaker module and a second speaker module, which are disposed within the speaker assembly  40 . The first speaker module may be disposed on the speaker assembly  40  disposed at a first end of the speaker device  100 . The second speaker module may be disposed on the speaker assembly  40  disposed at a second end of the speaker device  100 . In some embodiments, the speaker module may refer to all components of the speaker assembly  40  other than the button  4   d . For example, the speaker module may refer to the headphone core, the housing  20 , and one or more units (e.g., a microphone, a flexible circuit board, a bonding pad, etc.) accommodated in the housing  20 . 
     In some embodiments, the supporting connector  10  may be configured to accommodate a control circuit (not shown in the figure) or a battery (not shown in the figure). The control circuit or the battery may drive the headphone core to vibrate to generate a sound. 
     In some embodiments, the button  4   d  may be configured for user operation. For example, a user may operate the button  4   d  to perform a function such as a pause/start function, a recording function, an answering a call function, or the like, or any combination thereof. 
     In some embodiments, the button  4   d  may implement different interactive functions based on a user&#39;s operation instruction. For example, the user may click the button  4   d  once to pause/start e.g., music, recording, etc. As another example, the user may click the button  4   d  twice to answer a call. As a further example, the user may regularly click the button  4   d  (e.g., click the button  4   d  once every second, click the button  4   d  twice in total) to activate a recording function of the speaker device  100 . In some embodiments, the user&#39;s operation instruction may include a click, a slid, a scroll, or the like, or any combination thereof. For example, the user may slide up and down on a surface of the button  4   d  to realize a function of switching songs. 
     In some application scenarios, the speaker assembly  40  may include at least two buttons  4   d , and the at least two buttons  4   d  may correspond to a first ear hook (e.g., a left ear hook) of the two ear hooks  50  and the second ear hook (e.g., a right ear hook) of the two ear hooks  50 , respectively. The user may use the left and right hands to operate the at least two buttons  4   d , respectively, thereby improving the user&#39;s experience. 
     In some embodiments, to further improve the user&#39;s human-computer interaction experience, the human-computer interaction function may be allocated to the buttons  4   d  corresponding to the first ear hook and the second ear hook, respectively. The user may operate each of the at least two buttons  4   d  to realize corresponding functions. For example, the user may click the button  4   d  corresponding to the first ear hook once to activate a recording function, and/or click the button  4   d  corresponding to the first ear hook again to turn off the recording function. As another example, the user may click the button  4   d  corresponding to the first ear hook twice to realize the pause/play function. As another example, the user may click the button  4   d  corresponding to the second ear hook twice to answer a call or realize a next/previous song function when music is playing and there is no call. 
     In some embodiments, the aforementioned functions corresponding to the at least two buttons  4   d  may be determined by the user. For example, the user may assign the pause/play function executed by the button  4   d  corresponding to the first ear hook to the button  4   d  corresponding to the second ear hook by setting an application software. 
     As another example, the user may determine that the function of answering a call function executed by performing an operation on the button  4   d  corresponding to the first ear hook may be replaced by performing an operation on the button  4   d  corresponding to the second ear hook. In some embodiments, for a specific function, the user may determine the user&#39;s operation instruction (e.g., a number of clicking the button  4   d , a sliding gesture, etc.) by setting the application software to perform the function. For example, a user&#39;s operation instruction corresponding to the answering a call function may be determined as click the button  4   d  twice instead of once. As another example, a user&#39;s operation instruction corresponding to the next/previous song function may be determined as click the button  4   d  three times instead of twice. The user may determine the user&#39;s operation instruction based on a habit of the user, thereby improving the user experience. 
     In some embodiments, the above-mentioned interaction function may be not unique, which may be determined according to functions commonly used by the user. For example, the button  4   d  may be used to perform a call rejection function, a text messages read function, or the like, or any combination thereof. The user may determine the interaction function and/or the user&#39;s operation instruction, thereby meeting different needs. 
     In some embodiments, a distance between a center of the button  4   d  and the vibration fulcrum may be not greater than a distance between a center of the speaker module and the vibration fulcrum, thereby improving the vibration acceleration of the speaker assembly  40  and the volume generated by the vibration of the speaker assembly  40 . 
     In some embodiments, the center of the button  4   d  may include a center of mass m 1  or a centroid g 1 . A first distance I 1  may be formed between the center of mass m 1  or the centroid g 1  of the button  4   d  and the top point  25  (i.e., the vibration fulcrum) of the ear hook  50 . A second distance I 2  may be formed between a center of mass m 2  or a centroid g 2  of the speaker module and the top point  25  of the ear hook  50 . It should be noted that the center of mass and the centroid (e.g., the center of mass m 2  and the centroid g 2 ) of the speaker module may be replaced by a center of mass and a centroid of the housing  20 , respectively. 
     In some embodiments, a mass distribution of the button  4   d  and/or the speaker module may be relatively uniform. The center of mass m 1  of the button  4   d  may coincide with the centroid g 2  of the button  4   d . The center of mass m 2  of the speaker module may coincide with the centroid g 2  of the speaker module. 
     In some embodiments, the vibration of the speaker assembly  40  may be indicated by a ratio of the first distance I 1  to the second distance I 2 , and a ratio k of a mass of the button  4   d  to a mass of the speaker module. 
     Specifically, according to the dynamic principle, when the button  4   d  is arranged at a far end  4   h  of the top point  25  of the ear hook  50  away from the top point  25  of the ear hook  50 , a vibration acceleration of the speaker assembly  40  may be less than a vibration acceleration of the speaker assembly  40  when the button  4   d  is arranged at a proximal end  4   g  of the top point  25  of the ear hook  50 , thereby reducing the volume generated by the speaker assembly  40 . When the mass of the button  4   d  is constant, the vibration acceleration of the speaker assembly  40  may be decreased as the ratio of the first distance I 1  to the second distance I 2  increases, thereby reducing the volume generated by the speaker assembly  40 . When the ratio of the first distance I 1  to the second distance I 2  is constant, the vibration acceleration of the speaker assembly  40  may be decreased as the mass of the button  4   d  increases, thereby reducing the volume generated by the speaker assembly  40 . The volume generated by the speaker assembly  40  may be determined and/or adjusted within a range that the ear of the user can recognize by adjusting the ratio of the first distance I 1  to the second distance I 2  and/or the mass ratio k of the button  4   d  to the mass of the speaker module. 
     In some embodiments, the ratio of the first distance I 1  to the second distance I 2  may not be greater than 1. 
     Specifically, when the ratio of the first distance I 1  to the second distance I 2  is equal to 1, the center of mass m 1  and centroid g 1  of the button  4   d  may coincide with the center of the mass m 2  and the centroid g 2  of the speaker module, respectively, and the button  4   d  may be disposed on a center of the speaker assembly  40 . When the ratio of the first distance I 1  to the second distance I 2  is less than 1, the center of mass m 1  or the centroid g 1  of the button  4   d  may be closer to the top point  25  of the ear hook  50  with respect to the center of mass m 2  or the centroid g 2  of the speaker module, and the button  4   d  may be disposed on a proximal end close to the top point  25  of the ear hook  50 . The less the ratio of the first distance I 1  to the second distance I 2  is, the closer the center of mass m 1  or centroid g 1  of the button  4   d  to the top point  25  of the ear hook  50  relative to the center of mass m 2  or centroid g 2  of the speaker module is. 
     In some embodiments, the ratio of the first distance I 1  to the second distance I 2  may be not greater than 0.95, and the button  4   d  may be closer to the top point  25  of the ear hook  50 . In some embodiments, the ratio of the first distance I 1  to the second distance I 2  may be 0.9, 0.8, 0.7, 0.6, 0.5, etc., which may be determined according to actual needs and is not limited herein. 
     Further, when the ratio of the first distance I 1  to the second distance I 2  satisfies a range aforementioned, the ratio of the mass of the button  4   d  to the mass of the speaker module may not be greater than 0.3. For example, the ratio of the mass of the button  4   d  to the mass of the speaker module may not be greater than 0.29, 0.23, 0.17, 0.1, 0.06, 0.04, etc., which are not limited herein. 
     It should be noted that the center of mass m 1  of the button  4   d  may coincide with the centroid g 1  of the button  4   d  (not shown in the figure), that is, the center of mass m 1  of the button  4   d  and the centroid g 1  of the button  4   d  may locate at a same point. When the mass distribution of the button  4   d  and the speaker module is relatively uniform, the center of mass m 2  of the speaker module may coincide with the centroid g 2  (not shown in the figure) of the speaker module. 
     In some embodiments, the center of mass m 1  may not coincide with the centroid g 1  of the button  4   d . A structure of the button  4   d  may be relatively simple and/or regular, the centroid g 1  of the button  4   d  may be calculated relatively easily, the centroid g 1  may be regarded as a reference point. The center of mass m 2  may not coincide with the centroid g 2  of the speaker module. One or more units (e.g., a microphone, a flexible circuit board, a bonding pad, etc.) of the speaker module may be made of different materials, the mass distribution of the speaker module may be not uniform, and the one or more units may have an irregular shape, the center of mass m 2  of the speaker module may be regarded as a reference point. 
     In some application scenarios, the first distance I 1  may be formed between the centroid g 1  of the button  4   d  and the top point  25  of the ear hook  50 , and the second distance I 2  may be formed between the center of mass m 2  of the speaker module and the top point  25  of the ear hook  50 . The vibration of the button  4   d  in the speaker assembly  40  may be indicated by the ratio of the first distance I 1  to the second distance I 2 , and the ratio k of a mass of the button  4   d  to the mass of the speaker module. Specifically, when the mass of the button  4   d  is constant, the vibration acceleration of the speaker assembly  40  may be decreased as the ratio of the first distance I 1  to the second distance I 2  increases, thereby reducing the volume generated by the speaker assembly  40 . When the ratio of the first distance I 1  to the second distance I 2  is constant, the vibration acceleration of the speaker assembly  40  may be decreased as the mass of the button  4   d  increases, thereby reducing the volume generated by the speaker assembly  40 . The volume generated by the speaker assembly  40  may be determined and/or adjusted within a range that the ear can recognize by adjusting the ratio of the first distance I 1  to the second distance I 2  and/or the mass ratio k of the button  4   d  to the mass of the speaker module. 
     In some embodiments, the ratio of the first distance I 1  to the second distance I 2  may not be greater than 1. 
     Specifically, when the ratio of the first distance I 1  to the second distance I 2  is equal to 1, the centroid g 1  of the button  4   d  may coincide with the center of mass the m 2 , and the button  4   d  may be disposed on a center of the speaker assembly  40 . When the ratio of the first distance I 1  to the second distance I 2  is less than 1, the centroid g 1  of the button  4   d  may be closer to the top point  25  of the ear hook  50  with respect to the center of the mass m 2  of the speaker module, and the button  4   d  may be disposed on the proximal end close to the top point  25  of the ear hook  50 . The less the ratio of the first distance I 1  to the second distance I 2  is, the closer the center of mass m 1  or centroid g 1  of the button  4   d  to the top point  25  of the ear hook  50  relative to the center of mass m 2  or centroid g 2  of the speaker module. 
     In some embodiments, the ratio of the first distance I 1  to the second distance I 2  may be not greater than 0.95, and the button  4   d  may be closer to the top point  25  of the ear hook  50 . In some embodiments, the ratio of the first distance I 1  to the second distance I 2  may be 0.9, 0.8, 0.7, 0.6, 0.5, etc., which may be determined according to actual needs and is not limited herein. 
     Further, when the ratio of the first distance I 1  to the second distance I 2  satisfies a range aforementioned, the ratio of the mass of the button  4   d  to the mass of the speaker module may not be greater than 0.3. For example, the ratio of the mass of the button  4   d  to the mass of the speaker module may not be greater than 0.29, 0.23, 0.17, 0.1, 0.06, 0.04, etc., which are not limited herein. 
     It should be noted that, in some embodiments, the centroid g 2  of the speaker module be regarded as the reference point, which may be similar to the foregoing mentioned embodiments, which is not be repeated herein. 
       FIG.  3    is a schematic structural diagram illustrating a speaker assembly of a speaker device according to some embodiments of the present disclosure. In some embodiments, a speaker module of the speaker assembly  300  may include a headphone core and a housing  20 . The headphone core may be configured to generate a sound and the housing  20  may be configured to accommodate the headphone core. 
     In some embodiments, the housing  20  may include an outer side wall  412  and a peripheral side wall  411 . The peripheral side wall  411  may be connected to and surrounding the outer side wall  412 . When a user wears the speaker device, the side opposite to the outer side wall  412  (which is behind the outer side wall  412  in  FIG.  3    and not shown) may be in contact with the human head, and the outer side wall  412  may be located away from the human head. In some embodiments, the housing  20  may include a cavity configured to accommodates the headphone core. 
     In some embodiments, the peripheral side wall  411  may include a first peripheral side wall  411   a  arranged along a length direction of the outer side wall  412  and a second peripheral side wall  411   b  arranged along a width direction of the outer side wall  412 . The outer side wall  412  and the peripheral side wall  411  may be connected and form the cavity with an open end, and the cavity may be configured to accommodate the headphone core. 
     In some embodiments, a count (or a number) of the first peripheral side wall  411   a  and/or the second peripheral side wall  411   b  may be two. The first peripheral side wall  411   a  and the second peripheral side wall  411   b  may be enclosed in sequence. When the user wears the speaker device, the two first peripheral side walls  411   a  may face a front side and a back side of the user&#39;s head, respectively. The two second peripheral side walls  411   b  may face an upper side and a lower side of the user&#39;s head, respectively. 
     In some embodiments, the outer side wall  412  may cover an end of the first peripheral side wall  411   a  and the second peripheral side wall  411   b  after the first peripheral side wall  411   a  and the second peripheral side wall  411   b  are enclosed. The housing  20  with an open end and a closed end may be formed and configured to accommodate the headphone core. 
     In some embodiments, a shape enclosed by the first peripheral side wall  411   a  and the second peripheral side wall  411   b  may be not limited. The shape enclosed by the first peripheral side wall  411   a  and the second peripheral side wall  411   b  may include any shape suitable for wearing on the user&#39;s head, such as a rectangle, a square, a circle, an ellipse, etc. 
     In some embodiments, the shape enclosed by the first peripheral side wall  411   a  and the second peripheral side wall  411   b  may conform to the principle of ergonomics, thereby improving the wearing experience of the user. In some embodiments, a height of the first peripheral side wall  411   a  and a height of the second peripheral side wall  411   b  may be the same or different. When heights of two successively connected peripheral side walls  411  are not the same, a protruding part of the peripheral side wall  411  may not affect the wearing and/or operation of the user. 
       FIG.  4    is a schematic diagram illustrating a distance h 1  according to some embodiments of the present disclosure.  FIG.  5    is a schematic diagram illustrating a distance h 2  according to some embodiments of the present disclosure.  FIG.  6    is a schematic diagram illustrating a distance h 3  according to some embodiments of the present disclosure. In some embodiments, an outer side wall  412  may be disposed on an end enclosed by a first peripheral side wall  411   a  and a second peripheral side wall  411   b . When a user wears a speaker device, the outer side wall  412  may be located at an end of the first peripheral side wall  411   a  and the second peripheral side wall  411   b  away from the user&#39;s head. In some embodiments, the outer side wall  412  may include a proximal end point and a distal end point. The proximal end point and the distal end point may be located on a contour connecting the outer side wall  412  with the first peripheral side wall  411   a  and the second peripheral side wall  411   b , respectively. The proximal end point may be opposite to the distal end point on the contour. In some embodiments, the distance h 1  between the proximal end point and a vibration fulcrum may be relatively short, and the proximal end may be referred to as at a top position. The distance h 2  between the distal end point and the vibration fulcrum may be relatively long, and the distal end point may be referred to as at a bottom position. The distance h 3  between a midpoint of a line connecting the proximal end point and the distal end point and the vibration fulcrum may be between h 1  and h 2 , and the midpoint may be referred to as at a middle position. 
     In some embodiments, the button  4   d  may be located in the middle position of the outer side wall  412 . In some embodiments, the button  4   d  may be located between the middle position and the top position of the outer side wall  412 . 
       FIG.  7    is a schematic diagram illustrating a cross-sectional view of a partial structure of an exemplary speaker assembly according to some embodiments of the present disclosure. As shown in  FIG.  7   , a button  4   d  may include an elastic bearing  4   d   1  and a button block  4   d   2 . 
     In some embodiments, a shape of the button block  4   d   2  may be a rectangle with rounded corners, and the button block  4   d   2  may extend along a length direction of the outer side wall  412 . The button block  4   d   2  may include two symmetry axes (e.g., a long axis and a short axis), and the button block  4   d   2  may be arranged symmetrically in two symmetry directions, and the symmetry directions are perpendicular to each other. 
       FIG.  8    is a schematic diagram illustrating a distance D 1  and a distance D 2  according to some embodiments the present disclosure. As shown in  FIG.  8   , a vertical distance (along the long axis direction of the button  4   g ) between a top of the button  4   g  and a top end position of an outer side wall  412  is the first distance D 1 . A vertical distance between a bottom of the button  4   g  and a bottom end position of the outer side wall  412  is the second distance D 2 . A ratio of the first distance D 1  to the second distance D 2  may not be greater than 1. 
     Specifically, when the ratio of the distance D 1  to the distance D 2  is equal to 1, the button  4   g  may be located in a middle position of the outer side wall  412 . When the ratio of the first distance D 1  and the second distance D 2  is less than 1, the button  4   g  may be located between the middle position and the top end position of the outer side wall  412 . 
     In some embodiments, the ratio of the first distance D 1  to the second distance D 2  may be not greater than 0.95, and the button  4   g  may be located closer to the top end position of the outer wall  412  than the bottom end position, thereby improving a volume of a speaker assembly  40 . In some embodiments, the ratio of the first distance D 1  to the second distance D 2  may be 0.9, 0.8, 0.7, 0.6, 0.5, etc., which may be determined according to different needs and is not limited herein. 
     In some embodiments, a connection portion connecting the ear hook  50  and the speaker module may have a central axis. In some embodiments, an extension line r of the central axis may have a projection on a plane where the outer surface of the button  4   g  locates. An angle θ formed between the projection and the long axis direction of the button  4   g  may be less than 10°, for example, 9°, 7°, 5°, 3°, 1° etc., which is not limited herein. 
     When the angle θ formed between the projection of the extension line r on the plane where the outer surface of the button  4   g  locates and the long axis direction is less than 10°, a deviation of the long axis direction of the button  4   g  from the extension line r may be relatively small, and the long axis direction of the button  4   g  may be regarded as consistent or substantially consistent with the direction of the extension line r of the central axis. 
     In some embodiments, the long axis direction of the outer surface of the button  4   g  and the short axis direction of the outer surface of the button  4   g  may have an intersection. A distance d between the projection and the intersection may be relatively small. The distance d may be less than a width S 2  of the outer surface along the short axis direction of the button  4   g , making the button  4   g  close to the extension line r of the central axis of the ear hook  50 . In some embodiments, the projection of the extension line r of the central axis of the ear hook  50  on the plane where the outer surface of the button  4   g  locates may coincide with the long axis direction of the button  4   g , thereby further improving the sound quality of the speaker assembly  40 . 
     In some embodiments, a long axis of the button  4   g  may be in a direction from the top of the button  4   g  to the bottom of the button  4   g , or a direction in which the ear hook  50  may be connected to the housing  20 . The short axis of the button  4   g  may be perpendicular to the long axis of the button  4   g  and pass through a midpoint of a line connecting the top of the button  4   g  and the bottom of the button  4   g . A size of the button  4   g  along the long axis direction may be S 1 , and a size of the button  4   g  along a circumferential direction may be S 2 . 
     In some embodiments, the first peripheral side wall  411   a  may have a bottom end position, a middle position, and a top end position. 
     The bottom end position of the first peripheral side wall  411   a  may include a connection point connecting the first peripheral side wall  411   a  and the second peripheral side wall  411   b  which is away from the ear hook  50 . The top end position may include a connection point connecting the first peripheral side wall  411   a  and the second peripheral side wall  411   b  which is close to the ear hook  50 . The middle position may include a midpoint of a line connecting the bottom end position and the top end position of the first peripheral side wall  411   a.    
     In some embodiments, the button  4   g  may be disposed on the middle position of the first peripheral side wall  411   a  (not shown in the figure), or between the middle position and the top end position of the first peripheral side wall  411   b  (not shown in the figure). The button  4   g  may be centrally disposed on the first peripheral side wall  411   a  along a width direction of the first peripheral side wall  411   a  (the width direction of the first peripheral side wall is perpendicular to the plane where the outer surface of the button  4   g  locates). 
       FIG.  9    is a schematic diagram illustrating a distance  13  and a distance  14  according to some embodiments of the present disclosure. As shown in  FIG.  9   , the distance  13  refers to a vertical distance (along the long axis direction of the button  4   g ) between a top of a button  4   g  and a top end position of a first peripheral side wall  411   a . The distance  14  refers to a vertical distance between a bottom of the button  4   g  and a bottom end position of the first peripheral side wall  411 . A ratio of the distance  13  to the distance  14  may be not greater than one. 
     Further, the ratio of the distance  13  to the distance  14  may be not greater than 0.95, so that the button  4   g  may be relatively close to the top end position of the first peripheral side wall  411   a , that is, the button  4   g  may be relatively close to the vibration fulcrum, thereby improving the volume generated by a speaker assembly (e.g., the speaker assembly  40 ). The ratio of the distance  13  to the distance  14  may also be 0.9, 0.8, 0.7, 0.6, 0.5, etc., which may be determined according to the actual need and not limited herein. 
     It should be noted that the above descriptions are only some specific examples and should not be regarded as the only feasible implementations. Obviously, for those skilled in the art, after understanding the basic principle of the speaker device, it is possible to make various modifications in forms and details to the specific methods and steps of implementing the speaker device without departing from this principle of the present disclosure. For example, the button  4   g  may be disposed in one of the speaker assemblies on the left side and right side of the speaker device. As another example, the button  4   g  may be disposed in both speaker assemblies on the left side and right side of the speaker device. However, those variations, changes, and modifications do not depart from the scope of the present disclosure. 
     In some embodiments, the speaker device may further include a speaker mechanism such as a bone conduction speaker mechanism, an air conduction speaker mechanism, or the like, or any combination thereof. The speaker mechanism may adopt a sound conduction mode that converts a sound into mechanical vibrations with different frequencies, and transmit sound waves through the human skull, the bone labyrinth, the inner ear lymphatic fluid, the spiral organs, the auditory nerve, the auditory center, etc. In some embodiments, the speaker mechanism may include an MP3 player, a hearing aid, etc. 
     In some embodiments, the speaker mechanism of the speaker device may be an independent player that may be used directly. In some embodiments, the speaker mechanism of the speaker device may be a player that is disposed on an electronic device. 
     It should be known that, without departing from the principle, the descriptions described below can be applied to an air conduction speaker device, a bone conduction speaker device, etc. 
       FIG.  10    is a schematic diagram illustrating a longitudinal cross-sectional view of a speaker device according to some embodiments of the present disclosure. As shown in  FIG.  10   , in some embodiments, the speaker device may include a magnetic circuit assembly  210 , a coil  212 , a vibration transmission plate  214 , a connector  216 , and a housing  220 . In some embodiments, the magnetic circuit assembly  210  may include a first magnetic element  202 , a first magnetically conductive element  204 , and a second magnetically conductive element  206 . In some embodiments, the housing  220  may have a same or similar structure as the housing  20  described according to some embodiments of the present disclosure. 
     In some embodiments, the housing  220  may include a first housing panel  222 , a second housing panel  224 , and a housing side  226 . The first housing panel  222  and the second housing panel  224  may be disposed on two end sides of the housing side  226 , respectively. The second housing panel  224  may be disposed opposite to the housing panel  222 . The first housing panel  222 , the housing panel  224 , and the housing side  226  may form an integral structure with a certain accommodation space. In some embodiments, the magnetic circuit assembly  210 , the coil  212 , and the vibration transmission plate  214  may be fixedly disposed within the housing  220 . In some embodiments, the speaker device may further include a housing bracket  228 . The vibration transmission sheet  214  may be connected to the housing  220  via the housing bracket  228 . In some embodiments, the coil  212  may be fixedly disposed on the housing bracket  228 . The coil  212  may drive the housing  220  to vibrate through the housing bracket  228 . The housing bracket  228  may be a part of the housing  220  or a component independent from the housing  220 . The housing bracket  228  may be directly or indirectly connected to an inner of the housing  220 . In some embodiments, the housing bracket  228  may be fixedly disposed on an inner surface of the housing side  226 . In some embodiments, the housing bracket  228  may be pasted on the housing  220  by glue. In some embodiments, the housing bracket  228  may be fixed on the housing  220  via a stamping connection, an injection molding connection, a clamping connection, a riveting connection, a threading connection, a welding connection, or the like, or any combination thereof. 
     In some embodiments, a connection mode between each two of the first housing panel  222 , the second housing panel  224 , and the housing side  226  may be determined, thereby improving the rigidity of the housing  220 . In some embodiments, the first housing panel  222 , the second housing panel  224 , and the housing side  226  may be integrally formed. For example, the second housing panel  224  and the housing side  226  may be integrally formed. As another example, the first housing panel  222  and the housing side  226  may be directly connected via a glue, or the first housing panel  222  and the housing side  226  may be connected with each other via a clamping connection, a welding connection, or a threading connection, or the like, or any combination thereof. In some embodiments, the first housing panel  222 , the second housing panel  224 , and the housing side  226  may be independent of each other. The first housing panel  222 , the second housing panel  224 , and the housing side  226  may be connected with each other via a bonding connection, a clamping connection, a welding connection, or a threading connection, or the like, or any combination thereof. For example, the first housing panel  222  and the housing side  226  may be connected via a bonding connection, and the second housing panel  224  and the housing side  226  may be connected via a clamping connection, a welding connection, or a threading connection. As another example, the second housing panel  224  and the housing side  226  may be connected via a bonding connection, and the first housing panel  222  and the housing side  226  may be connected via a clamping connection, a welding connection, or a threading connection. 
     In different application scenarios, the housing of the speaker device described in the present disclosure may be assembled by different assembly modes. For example, as above described, the housing (e.g., housing  220 ) of a speaker device may be integrally formed, the speaker device may be combined by one or more independent components, or the like, or any combination thereof. The one or more components may be combined to generate the speaker device via a bonding connection, a clamping connection, a welding connection, a threaded connection. To illustrate the assembly mode of the housing of the speaker device,  FIGS.  11 - 13    illustrates several examples of assembly modes of housings of exemplary speaker devices. 
       FIG.  11    is a schematic diagram illustrating a longitudinal cross-sectional view of a speaker device according to some embodiments of the present disclosure. As shown in  FIG.  11   , the speaker device  1100  may include a magnetic circuit assembly  2210  and a housing (e.g., the housing  220  described in  FIG.  10   ). The magnetic circuit assembly  2210  may include a first magnetic element  2202 , a first magnetically conductive element  2204 , and a second magnetically conductive element  2206 . 
     In some embodiments, the magnetic circuit components described in the above embodiments may have the same (or substantially the same) structure, which refers to a structure configured to provide a magnetic field. In some embodiments, the housings described in the above embodiments may be of the same structure, and each of the housing may be configured to accommodate the magnetic circuit assembly. 
     In some embodiments, the housing of the speaker device  1100  may include a housing panel  2222 , a housing back  2224 , and a housing side  2226 . The housing side  2226  and the housing back  2224  may be integrally formed, and the housing panel  2222  may be connected to one end of the housing side  2226  as an independent component. For example, the housing panel  2222  may be connected to the end of the housing side  2226  via a bonding connection, a clamping connection, a welding connection, or a threading connection, or the like, or any combination thereof. The housing panel  2222  and the housing side  2226  (or the housing back  2224 ) may be made of different, the same, or partly the same materials. In some embodiments, the housing panel  2222  and the housing side  2226  may be made of the same material, and Young&#39;s modulus of the material may be greater than 2000 MPa. Preferably, Young&#39;s modulus of the material may be greater than 4000 MPa. More preferably, Young&#39;s modulus of the material may be greater than 6000 MPa. More preferably, Young&#39;s modulus of the material may be greater than 8000 MPa. More preferably, Young&#39;s modulus of the material may be greater than 12000 MPa. More preferably, Young&#39;s modulus of the material may be greater than 15000 MPa. More preferably, Young&#39;s modulus of the material may be greater than 18000 MPa. In some embodiments, the housing panel  2222  and the housing side  2226  may be made of different materials, and Young&#39;s modulus of the material of the housing panel  2222  and Young&#39;s modulus of the material of the housing side  2226  may be greater than 4000 MPa. Preferably, Young&#39;s modulus of the material of the housing panel  2222  and Young&#39;s modulus of the material of the housing side  2226  may be greater than 6000 MPa. More preferably, Young&#39;s modulus of the material of the housing panel  2222  and Young&#39;s modulus of the material of the housing side  2226  may be greater than 8000 MPa. More preferably, Young&#39;s modulus of the material of the housing panel  2222  and Young&#39;s modulus of the material of the housing side  2226  may be greater than 12000 MPa. More preferably, Young&#39;s modulus of the material of the housing panel  2222  and Young&#39;s modulus of the material of the housing side  2226  may be greater than 15000 MPa. More preferably, Young&#39;s modulus of the material of the housing panel  2222  and Young&#39;s modulus of the material of the housing side  2226  may be greater than 18000 MPa. In some embodiments, the material of the housing panel  2222  and/or the housing side  2226  may include but is not limited to acrylonitrile butadiene styrene (ABS), polystyrene (PS), high impact polystyrene (HIPS), polypropylene (PP), polyethylene terephthalate (PET), polyester (PES), polycarbonate (PC), polyamides (PA), polyvinyl chloride (PVC), polyurethanes (PU), polyethylene (PE), polymethyl methacrylate (PMMA), polyetheretherketone (PEEK), phenolics (PF), urea-formaldehyde (UF), melamine formaldehyde (MF), a metal, an alloy (e.g., aluminum alloy, chromium-molybdenum steel, scandium alloy, magnesium alloy, titanium alloy, magnesium-lithium alloy, nickel alloy, etc.), glass fiber, carbon fiber, or the like, or any combination thereof. In some embodiments, the material of the housing panel  2222  may include glass fiber, carbon fiber, PC, PA, or the like, or any combination thereof. In some embodiments, the material of the housing panel  2222  and/or the shell side  2226  may include a mixture generated by mixing carbon fiber and PC with a certain ratio. In some embodiments, the material of the housing panel  2222  and/or the housing side  2226  may include a mixture generated by mixing carbon fiber, glass fiber, and PC with a certain ratio. In some embodiments, the material of the shell panel  2222  and/or the shell side  2226  may include a mixture generated by mixing glass fiber and PC with a certain ratio, or a mixture generated by mixing glass fiber and PA with a certain ratio. 
     As shown in  FIG.  11   , the housing panel  2222 , the housing back  2224 , and the housing side  2226  may form an integral structure with an accommodation space. In some embodiments, within the integral structure, a vibration transmission plate  2214  may be connected to the magnetic circuit assembly  2210  via a connector  2216 . Two sides of the magnetic circuit assembly  2210  may be connected to a first magnetically conductive element  2204  and a second magnetically conductive element  2206 , respectively. The vibration transmission sheet  2214  may be fixedly disposed within the integral structure via a housing bracket  2228 . In some embodiments, the housing side  2226  of the housing may have a step structure configured to support the housing bracket  2228 . After the housing support  2228  is fixedly disposed on the housing side  2226 , the housing panel  2222  may be fixedly disposed on the housing support  2228  and the housing side  2226 , or the housing panel  2222  may be separately fixed on the housing support  2228  or the housing side  2226 . Alternatively, the housing side  2226  and the housing bracket  2228  may be integrally formed. In some embodiments, the housing bracket  2228  may be fixedly disposed on the housing panel  2222  (e.g., via a bonding connection, a clamping connection, a welding connection, a threading connection, etc.). The fixed housing panel  2222  and housing bracket  2228  may be fixed to the housing side  2226  e.g., via a bonding connection, a clamping connection, a welding connection, a threading connection, etc. Alternatively, the housing bracket  2228  and the housing panel  2222  may be integrally formed. 
       FIG.  12    is a schematic diagram illustrating a longitudinal cross-sectional view of a speaker device according to some embodiments of the present disclosure. As shown in  FIG.  12   , the speaker device  1200  may include a magnetic circuit assembly  2240  and a housing. The magnetic circuit assembly  2240  may include a first magnetic element  2232 , a first magnetically conductive element  2234 , and a second magnetically conductive element  2236 . A vibration transmission plate  2244  may be connected to the magnetic circuit assembly  2240  via a connector  2246 . 
     In some embodiments, the magnetic circuit assemblies (e.g., the magnetic circuit assembly  210 , the magnetic circuit assembly  2210 , the magnetic circuit assembly  2240 , etc.) described in the above embodiments may be of the same structure, and each of the magnetic circuit assemblies may be configured provide a magnetic field. In some embodiments, the housings described in the above embodiments may be of the same structure, and each of the housings may be configured to accommodate the magnetic circuit assembly. In some embodiments, the vibration transmission plates (e.g., the vibration transmission plate  214 , the vibration transmission plate  2214 , the vibration transmission plate  2244 , etc.) described in the above embodiments may be of the same (or substantially the same) structure, and each of the vibration transmission plates may be configured to adjust a low-frequency resonance peak. 
     In some embodiments, the connectors described in the above embodiments may have the same (or substantially the same) structure, which refers to a structure configured to connect the vibration transmission plate and the magnetic circuit assembly. A housing bracket  2258  and a housing side  2256  of the speaker device described in  FIG.  12    may be integrally formed, which may be different from the speaker device described in connection with  FIG.  11   . A housing panel  2252  may be fixedly disposed on a first side of a housing side  2256 , and the first side of the housing side  2256  may be connected to the housing bracket  2258  (e.g., via a bonding connection, a snaping connection, a welding connection, a threaded connection, etc.) A housing panel  2254  may be disposed on a second side of the housing side  2256  (e.g., via a bonding connection, a snaping connection, a welding connection, a threaded connection, etc.). In this case, alternatively, the housing support  2258  and the housing side  2256  may be independent of each other. The housing panel  2252  and the housing bracket  2258 , the housing bracket  2258  and the housing side  2256 , and the housing side  2256  and the housing panel  2254  may be connected via a bonding connection, a snaping connection, a welding connection, a threaded connection, etc., respectively. 
       FIG.  13    is a schematic diagram illustrating a longitudinal cross-sectional view of a speaker device according to some embodiments of the present disclosure. As shown in  FIG.  13   , the speaker device  1300  may include a magnetic circuit assembly  2270  and a housing. The magnetic circuit assembly  2270  may include a first magnetic element  2262 , a first magnetically conductive element  2264 , and a second magnetically conductive element  2266 . A vibration transmission plate  2274  may be connected to the magnetic circuit assembly  2270  through a connector  2276 . 
     In some embodiments, the magnetic circuit assemblies (e.g., the magnetic circuit assembly  210 , the magnetic circuit assembly  2210 , the magnetic circuit assembly  2240 , the magnetic circuit assembly  2270 , etc.) mentioned in the above embodiments may be of the same structure, and each of the magnetic circuit assemblies may be configured provide a magnetic field. In some embodiments, the housings described in the above embodiments may be of the same structure, and each of the housings may be configured to accommodate the magnetic circuit assembly. In some embodiments, the vibration transmission plates (e.g., the vibration transmission plate  214 , the vibration transmission plate  2214 , the vibration transmission plate  2244 , the vibration transmission plate  2274 , etc.) described in the above embodiments may be of the same (or substantially the same) structure, and each of the vibration transmission plates may be configured to adjust a low-frequency resonance peak. 
     A difference between the speaker device  1300  and at least one of the speaker device  1100  and the speaker device  1200  may be that a housing panel  2282  and a housing side  2286  may be integrally formed. A housing panel  2284  may be fixed on the side surface  2286  of the housing (e.g., via a bonding connection, a snaping connection, a welding connection, a threaded connection, etc.), and the housing panel  2284  may be opposite to the housing panel  2282 . A housing bracket  2288  may be fixed on the housing panel  2282  and/or the housing side  2286  via a bonding connection, a snaping connection, a welding connection, a threaded connection, etc. Alternatively, the housing bracket  2288 , the housing panel  2282 , and the housing side  2286  may be integrally formed. 
       FIG.  14    is a schematic diagram illustrating a housing of an exemplary speaker device according to some embodiments of the present disclosure. As shown in  FIG.  14   , the housing body  700  may include a housing panel  710  facing a human body, a housing back  720 , and a housing side  730  opposite to the housing panel  710 . The housing panel  710  may be in contact with the human body, and transmit a vibration of the speaker device to the auditory nerve of the human body. 
     In some embodiments, a headphone core of a speaker device may cause the housing panel  710  and the housing back  720  to vibrate, the vibration of the housing panel  710  may have a first phase, and the vibration of the housing back  720  may have a second phase. An absolute value of a difference between the first phase and the second phase may be less than 60 degrees when a frequency of each of the vibration of the housing panel  710  and the vibration of the housing back  720  is between 2000 Hz and 3000 Hz. 
     In some embodiments, when the rigidity of the housing body  700  is relatively large, a vibration amplitude of the housing panel  710  and a vibration amplitude of the housing back  720  may be the same or substantially the same (e.g., the housing side  730  may not compress air and may not generate sound leakage), and the first phase of the substantially the same housing panel  710  and the second phase of the housing back  720  may be the same or within a frequency range. A first sound leakage sound wave generated by the housing panel  710  and a second sound leakage sound wave generated by the back surface  720  may be superimposed, thereby reducing an amplitude of the first leakage sound wave or an amplitude of the second leakage sound wave, and accordingly reducing the sound leakage of the housing body  700 . In some embodiments, a portion of the frequency range may be greater than 500 Hz. Preferably, a portion of the frequency range may be greater than 600 Hz. More preferably, a portion of the frequency range may be greater than 800 Hz. More preferably, a portion of the frequency range may be greater than 1000 Hz. More preferably, a portion of the frequency range may be greater than 2000 Hz. More preferably, a portion of the frequency range may be greater than 5000 Hz. More preferably, a portion of the frequency range may be greater than 8000 Hz. More preferably, a portion of the frequency range may be greater than 10000 Hz. 
     In some embodiments, a rigidity of a housing body of a bone conduction speaker may affect a vibration amplitude and a phase of different components (e.g., the housing panel  710 , the housing back  720 , a housing side  730 , etc.) of the housing body  700 , thereby affecting the sound leakage of a bone conduction speaker device. In some embodiments, when the housing body  700  of the bone conduction speaker device has a relatively large rigidity, the housing panel  710  and the housing back  720  of the bone conduction speaker may have the same or substantially the same vibration amplitude and phase at a relatively high frequency, thereby significantly reducing the leakage of the sound of the bone conduction speaker device. 
     In some embodiments, the relatively high frequency may include a frequency not less than 1000 Hz, for example, a frequency between 1000 Hz and 2000 Hz, a frequency between 1100 Hz and 2000 Hz, a frequency between 1300 Hz and 2000 Hz, and a frequency between 1500 Hz and 2000 Hz, a frequency between 1700 Hz-2000 Hz, a frequency between 1900 Hz-2000 Hz, etc. Preferably, the relatively high frequency may include a frequency not less than 2000 Hz, for example, a frequency between 2000 Hz and 3000 Hz, a frequency between 2100 Hz and 3000 Hz, a frequency between 2300 Hz and 3000 Hz, a frequency between 2500 Hz and 3000 Hz, a frequency between 2700 Hz-3000 Hz, a frequency between 2900 Hz-3000 Hz, etc. More preferably, the relatively high frequency may include a frequency not less than 4000 Hz, for example, a frequency between 4000 Hz and 5000 Hz, a frequency between 4100 Hz and 5000 Hz, a frequency between 4300 Hz and 5000 Hz, a frequency between 4500 Hz and 5000 Hz, a frequency between 4700 Hz and 5000 Hz, a frequency between 4900 Hz-5000 Hz, etc. More preferably, the relatively high frequency may include a frequency not less than 6000 Hz, for example, a frequency between 6000 Hz and 8000 Hz, a frequency between 6100 Hz and 8000 Hz, a frequency between 6300 Hz and 8000 Hz, a frequency between 6500 Hz and 8000 Hz, a frequency between 7000 Hz and 8000 Hz, frequency between 7500 Hz and 8000 Hz, a frequency between 7900 Hz and 8000 Hz, etc. More preferably, the relatively high frequency may include a frequency not less than 8000 Hz, for example, a frequency between 8000 Hz and 12000 Hz, a frequency between 8100 Hz and 12000 Hz, a frequency between 8300 Hz and 12000 Hz, a frequency between 8500 Hz and 12000 Hz, a frequency between 9000 Hz and 12000 Hz, a frequency between 10000 Hz and 12000 Hz, a frequency between 11000 Hz and 12000 Hz, etc. 
     A same or substantially the same vibration amplitude between the housing panel  710  and the housing back  720  refers to that a ratio of the vibration amplitude of the housing panel  710  to the vibration amplitude of the housing back  720  is within a certain range. For example, the ratio of the vibration amplitude of the housing panel  710  to the vibration amplitude of the housing back  720  may be between 0.3 and 3. Preferably, the ratio of the vibration amplitude of the housing panel  710  to the vibration amplitude of the housing back  720  may be between 0.4 and 2.5. More preferably, the ratio of the vibration amplitude of the housing panel  710  to the vibration amplitude of the housing back  720  may be between 0.4 and 2.5. More preferably, the ratio of the vibration amplitude of the housing panel  710  to the vibration amplitude of the housing back  720  may be between 0.5 and 1.5. More preferably, the ratio of the vibration amplitude of the housing panel  710  to the vibration amplitude of the housing back  720  may be between 0.6 and 1.4. More preferably, the ratio of the vibration amplitude of the housing panel  710  to the vibration amplitude of the housing back  720  may be between 0.7 and 1.2. More preferably, the ratio of the vibration amplitude of the housing panel  710  to the vibration amplitude of the housing back  720  may be between 0.75 and 1.15. More preferably, the ratio of the vibration amplitude of the housing panel  710  to the vibration amplitude of the housing back  720  may be between 0.8 and 1.1. More preferably, the ratio of the vibration amplitude of the housing panel  710  to the vibration amplitude of the housing back  720  may be between 0.8 and 1.1. More preferably, the ratio of the vibration amplitude of the housing panel  710  to the vibration amplitude of the housing back  720  may be 0.85 and 1.1. More preferably, the ratio of the vibration amplitude of the housing panel  710  to the vibration amplitude of the housing back  720  may be between 0.9 and 1.05. In some embodiments, the vibration of the housing panel  710  and the housing back  720  may be represented by other physical quantities that can characterize the vibration amplitude. For example, a sound pressure generated by the housing panel  710  and a sound pressure generated by the housing back  720  at a point in the space may be configured to represent the vibration amplitude of the housing panel  710  and the housing back  720 , respectively. 
     A same or substantially the same phase of the housing panel  710  and the housing back  720  refers to that a difference between the first phase and the second phase may be within a phase range. Preferably, the difference between the first vibration phase and the second phase may be between −90° and 90°. More preferably, the difference between the first vibration phase and the second phase may be between −80° and 80°. More preferably, the difference between the first vibration phase and the second phase may be between −60° and 60°. More preferably, the difference between the first vibration phase and the second phase may be between −45° and 45°. More preferably, the difference between the first vibration phase and the second phase may be between −30° and 30°. More preferably, the difference between the first vibration phase and the second phase may be between −20° and 20°. More preferably, the difference between the first vibration phase and the second phase may be between −15° and 15°. More preferably, the difference between the first vibration phase and the second phase may be between −12° and 12°. More preferably, the difference between the first vibration phase and the second phase may be between −10° and 10°. More preferably, the difference between the first vibration phase and the second phase may be between −8° and 8°. More preferably, the difference between the first vibration phase and the second phase may be between −6° and 6°. More preferably, the difference between the first vibration phase and the second phase may be between −5° and 5°. More preferably, the difference between the first vibration phase and the second phase may be between −4° and 4°. More preferably, the difference between the first vibration phase and the second phase may be between −3° and 3°. More preferably, the difference between the first vibration phase and the second phase may be between −2° and 2°. More preferably, the difference between the first vibration phase and the second phase may be between −1° and 1°. More preferably, the difference between the first vibration phase and the second phase may be 0°. 
     It should be noted that the above descriptions are only some specific examples and should not be regarded as the only feasible implementations. Obviously, for those skilled in the art, after understanding the basic principle of the speaker device, it is possible to make various modifications in forms and details to the housing body the speaker device without departing from this principle of the present disclosure. For example, the connection between the housing panel  710  and the housing side  730 , the connection between the housing back  720  and the housing side  730  may be not limited to the above-mentioned connections. Merely by way of example, the housing side  730 , the housing back  720 , and a housing bracket may be integrally formed. As another example, the housing side  730 , the housing back  720 , the housing bracket, and the housing panel  710  may be integrally formed. However, those variations, changes, and modifications do not depart from the scope of the present disclosure. 
       FIG.  15    is a schematic diagram illustrating an application scenario and a structure of an exemplary speaker device according to some embodiments of the present disclosure. As shown in  FIG.  15   , in some embodiments, the speaker device  1510  may include a driving device  101 , a transmission assembly  303 , a panel  301 , and a housing  302 . 
     It should be noted that the housing bodies, the housings mentioned in the above embodiments may be of the same structure, and each of the housing body and the housing may be configured to accommodate a magnetic circuit assembly. In some embodiments, the panel (e.g., the panel  301 ) and the housing panel may be of the same structure, and each of the panel and the housing panel may be in contact with a human body and configured to transmit a sound to the human body. The driving device  101  may be the same as or similar to the headphone core described in the above embodiments. 
     In some embodiments, the driving device  101  may transmit a vibration signal to the panel  301  and/or the housing  302  through the transmission assembly  303 , thereby transmitting the sound to the human body via the contact between the panel  301  and the human body or between the housing  302  and the human body. In some embodiments, the panel  301  and/or the housing  302  of the speaker device  1510  may be in contact with the human body at the tragus. In some embodiments, the panel  301  and/or the housing  302  may be in contact with the human body on the rear side of the auricle. 
     As shown in  FIG.  15   , in some embodiments, a line B (or a vibration direction of the driving device  101 ) where a driving force generated by the driving device  101  locates may form an angle θ with a normal line A of the panel  301 , that is, the line B and the normal line A of the panel  301  may be not parallel. 
     Further, the panel  301  may include an area, and the area may be in contact or abut against the human body (e.g., the human skin). In some embodiments, the panel  301  may be covered with other materials (e.g., a soft material such as silicone), thereby improving the wearing comfortability of the human body. In this case, the panel  301  may be not in contact with the human body, and the panel  301  may abut against the human body. In some embodiments, the entire or a portion of the panel  301  may be in contact with the human body. In some embodiments, the area which may be in contact or abut against the human body may account more than 50% of an area of the panel  301 . Preferably, the area which may be in contact or abut against the human body may account for more than 60% of the area of the panel  301 . In some embodiments, the area which may be in contact or abut against the human body may include a flat surface, a curved surface, or the like, or any combination thereof. 
     In some embodiments, when the area on the panel  301 , which is in contact with or abuts against the human body, is a flat surface, the normal line of the panel  301  may be a dashed line perpendicular to the flat surface. In some embodiments, when the area on the panel  301 , which is in contact with or abuts against the human body, is a curved surface, the normal line of the panel  301  may be an average normal line of the curved surface. 
     The average normal be represented by Equation (1) below: 
     
       
         
           
             
               
                 
                   
                     = 
                     
                       
                         
                           ∯ 
                           S 
                         
                            
                         
                           
                             r 
                             ^ 
                           
                           ⁢ 
                              
                           ds 
                         
                       
                       
                         
                           ❘ 
                           &#34;\[LeftBracketingBar]&#34; 
                         
                         
                           
                             ∯ 
                             S 
                           
                              
                           
                             
                               r 
                               ^ 
                             
                             ⁢ 
                                
                             ds 
                           
                         
                         
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                           &#34;\[RightBracketingBar]&#34; 
                         
                       
                     
                   
                   , 
                 
               
               
                 
                   ( 
                   1 
                   ) 
                 
               
             
           
         
       
     
     where  represents a normal line, {circumflex over (r)} represents a normal line of a point on the curved surface, and ds represents a surface element. 
     In some embodiments, the curved surface may include a quasi-plane, which may be close to a plane, that is, an angle between a normal line of a point in at least 50% of the area of the curved surface, and the average normal may be less than an angle threshold. In some embodiments, the angle threshold may be less than 10°. In some embodiments, the angle threshold may be less than 5°. 
     In some embodiments, the line B where the driving force locates and the normal line A′ of the area on the panel  301 , which is in contact with the human body, may form an angle θ. Preferably, a value of the angle θ may be between 0° and 180°. More preferably, the value of the angle θ may be between 0° and 180° and not equal to 90°. In some embodiments, assuming that the line B has a positive direction pointing out of the speaker device  1510 , and the normal line A of the panel  301  (or the normal line A′ of the area of the panel  301 , which is in contact with the human skin) also has a positive direction pointing out of the speaker device  1510 , the angle θ formed between the normal line A and the line B or between the normal line A′ and the line B may be an acute angle along the positive direction, that is, the angle θ may be between 0° and 90°. 
       FIG.  16    is a schematic diagram illustrating an exemplary angle direction according to some embodiments of the present disclosure. As shown in  FIG.  16   , in some embodiments, a driving force generated by a driving device  101  may have a first component in the first quadrant of an XOY plane coordinate system and/or a second component in the third quadrant of the XOY plane coordinate system. In some embodiments, the XOY plane coordinate system may include a reference coordinate system. An origin O of the XOY plane coordinate system may be located on a contact surface between a panel and/or a housing of the speaker and the human body after a speaker device is worn on a human body. An X-axis of the XOY plane coordinate system may be parallel to a coronal axis of the human body. A Y-axis of the XOY plane coordinate system may be parallel to a sagittal axis of the human body. A positive direction of the X-axis may face outside of the human body, and a positive direction of the Y-axis may face the front of the human body. Quadrants refer to four regions divided by a horizontal axis (e.g., the X-axis of the XOY plane) and a vertical axis (e.g., the Y-axis of the XOY plane) in a rectangular coordinate system. Each of the four regions is called a quadrant. The quadrant may be centered at an origin, and the horizontal axis and the vertical axis may be regarded as dividing lines between the four regions. A relatively upper right region of the four regions (i.e., a region enclosed by a positive half axis of the horizontal axis and a positive half axis of the vertical axis) of the four regions may be regarded as a first quadrant. A relatively upper left region of the four regions (e.g., a region enclosed by a negative half axis of the horizontal axis and a positive half axis of the vertical axis) of the four regions may be regarded as a second quadrant. A relatively low left region (i.e., a region enclosed by the negative half axis of the horizontal axis and a negative half axis of the vertical axis) of the four regions may be regarded as a third quadrant. A relatively low right region (i.e., a region enclosed by the positive half axis of the horizontal axis and the negative half axis of the vertical axis) of the four regions may be regarded as a fourth quadrant. Each of points at a coordinate axis (e.g., the horizontal axis or the vertical axis) does not belong to any quadrant. It should be understood that a driving force in some embodiments may be located in the first quadrant and/or third quadrant of the XOY plane coordinate system, or the driving force may be directed in other directions, a projection or component of the driving force may be in the first quadrant and/or the third quadrant of the XOY plane coordinate system, and a projection or component of the driving force in a Z-axis direction may be zero or not zero, wherein the Z-axis may be perpendicular to the XOY plane and pass through the origin O. In some embodiments, a relatively small angle θ between a line where the driving force locates and a normal line of an area of a panel of a speaker device, which is in contact with or abuts against a user&#39;s body may be any acute angle. For example, a range of the angle θ may be 5° ˜80°. Preferably, the range of the angle θ may be 15°˜70°. More preferably, a range of the angle θ may be 25°˜60°. More preferably, the range of the angle θ may be 25°˜50°. More preferably, the range of the angle θ may be 28°˜50°. More preferably, the range of the angle θ may be 30°˜39°. More preferably, the range of the angle θ may be 31°˜38°. More preferably, the range of the angle θ may be 32°˜37°. More preferably, the range of the angle θ may be 33°˜36°. More preferably, the range of the angle θ may be 33°˜35.8°. More preferably, the range of the angle θ may be 33.5°˜35°. In some embodiments, the angle θ may be 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 34.2°, 35°, 35.8°, 36°, 37°, 38°, etc., and an error of the angle θ may be controlled within 0.2°. It should be noted that the driving force described above should not be regarded as a limitation of the driving force in the present disclosure. In some embodiments, the driving force may have one or more components in the second and/or the fourth quadrants of the XOY plane coordinate system. In some embodiments, the driving force may be located on the Y-axis. 
       FIG.  17    is a schematic diagram illustrating an exemplary speaker device acting on human skin or bones according to some embodiments of the present disclosure. As shown in  FIG.  17   , the speaker device may include a driving device  101  (also referred to as a transducer device, not shown in  FIG.  17   ), a transmission assembly  303 , a panel  301 , and a housing  302 . 
     In some embodiments, a line where a driving force of the speaker device locates may be collinear or parallel to a line where the drive device  101  vibrates. For example, in the driving device  101 , a direction of a driving force may be the same as or opposite to a vibration direction of the coil and/or a magnetic circuit assembly based on the moving coil principle. In some embodiments, the panel  301  may include a flat surface or a curved surface. In some embodiments, the panel  301  may include a plurality of protrusions and/or grooves. In some embodiments, after the speaker device is worn on a user body, a normal line of an area on the panel  301  that is in contact with or abuts against the user&#39;s body may be not parallel to the line where the driving force locates. Generally speaking, the area on the panel  301  that is in contact with or abuts against the user&#39;s body may be relatively flat. Specifically, the area on the panel  301  that is in contact with or abuts against the user&#39;s body may include a plane or a quasi-plane with a relatively small curvature. When the area on the panel  301  configured to contact or abut against the user&#39;s body is a plane, a normal line of any point on the area may be regarded as the normal line of the area. When the area on the panel  301  configured to contact the user&#39;s body is non-planar, the normal line of the area may include an average normal line of the area. In this case, a normal line A of the panel  301  and a normal A′ of the area of the panel  301  contacted with the human skin may be parallel or coincident with each other. More descriptions regarding the average normal line may be found elsewhere in the present disclosure. See, e.g.,  FIG.  15    and the relevant descriptions thereof. In some other embodiments, when the area configured to contact the user&#39;s body on the panel  301  is non-planar, the normal line of the area may be determined according to the following operations. A point in an area of the panel  301  may be determined. The area of the panel  301  may contact with the human skin. A tangent plane of the panel  301  at the point may be determined, and a line perpendicular to the tangent plane through the point may be determined. The line may be regarded as a normal line of the panel  301 . When the entire or a portion of the panel  301  which is connected with the human skin is a non-planar, selected points may be different, tangent planes at the selected points may be different, and normal lines corresponding to the tangent planes may be different. In this case, the normal line A′ of the normal lines may be not parallel to the normal A of the panel. According to some embodiments of the present disclosure, an angle θ may be formed between the line where the driving force locates (or the line where the drive device  101  vibrates) and the normal line of the area, and the angle θ may be granter than 0 and less than 180°. In some embodiments, a direction of the driving force from the panel (or the contact surface of the panel and/or the housing connected with the human skin) to the outside of the speaker device may be assumed as a positive direction of the line where the driving force locates, a direction of the normal line pointing outward the panel (or a connect surface of the panel  301  and/or the housing  302  connected with the human skin) may be assumed as a positive direction of the normal line, accordingly, the angle θ may be an acute angle. As shown in  FIG.  17   , in some embodiments, each of the coil  304  and the magnetic circuit assembly  307  may include a ring-shaped structure. In some embodiments, an axis of the coil  304  and an axis of the magnetic circuit assembly  307  may be parallel to each other. The axis of the coil  304  or the axis of the magnetic circuit assembly  307  may be perpendicular to a radial plane of the coil  304  and/or a radial plane of the magnetic circuit assembly  307 . In some embodiments, the coil  304  and the magnetic circuit assembly  307  may have the same central axis. The central axis of the coil  304  may be perpendicular to the radial plane of the coil  304  and pass through a geometric center of the coil  304 . The central axis and the radial plane of the circuit assembly  307  may be vertical to each other, and the central axis of the magnetic circuit assembly  307  may pass through the geometric center of the magnetic circuit assembly  307 . The axis of the coil  304  or the axis of the magnetic circuit assembly  307  and the normal of the panel  301  may form the aforementioned angle θ. 
     In some embodiments, the magnetic circuit assembly described in the above embodiments may be of the same structure, which may refer to a structure that provides a magnetic field. The coils described in the above embodiments may be of the same structure, which may refer to a structure that can receive an external electrical signal and convert the electrical signal into a mechanical vibration signal under the action of the magnetic field. 
     Merely by way of example, a relationship between a driving force and skin deformation may be described in connection with  FIG.  17   . When a line where the driving forced locates, which is generated by the driving device  101 , is parallel to the normal line of the panel  301  (i.e., the angle θ is equal to zero), the relationship between the driving force and the total skin deformation may be represented by Equation (2) 
         F   ⊥   =S   ⊥   ×E×A/h   (2)
 
     Where F ⊥  represents the driving force, S ⊥  represents the total skin deformation along a direction perpendicular to the skin, E represents an elastic modulus of the skin, A represents the contact area between the panel  301  and the skin, and h represents a total thickness of the skin (that is, a distance between the panel and the bone). 
     When the line where the driving force of the driving device  101  locates is perpendicular to the normal of the area on the panel  301 , which is in contact with or abut against the user&#39;s body (i.e., the angle is 90°), the relationship between a driving force in the vertical direction and the total skin deformation may be represented by Equation (3) below: 
         F   //   =S   //   ×G×A/h   (3)
 
     Where F //  represents the driving force in the vertical direction S //  represents a total skin deformation along a direction parallel to the skin, G represents a shear modulus of the skin, A represents the contact area between the panel  301  and the skin, and h represents the total thickness of the skin (i.e., the distance between the panel and the bone). 
     A relationship between shear modulus and elastic modulus may be represented by Equation (4) below: 
         G=E/ 2(1+ y )  (4)
 
     where y represents the Poisson&#39;s ratio of the skin, o&lt;y&lt;0.5, the shear modulus is less than the elastic modulus, and S // &gt;s ⊥  under the same driving force. Generally, the Poisson&#39;s ratio of the skin may be close to 0.4. 
     When the line where the driving device  101  locates is not parallel to the normal line of the area where the panel  301  is in contact with the user&#39;s body, a driving force along a horizontal direction and the driving force along the vertical direction may be represented by Equation (5) and Equation (6), respectively: 
         F   ⊥   =F ×cos(θ)  (5)
 
         F   //   =F ×sin(θ)  (6)
 
     wherein the relationship between driving force F and skin deformation s may be represented by Equation (7) below: 
     
       
         
           
             
               
                 
                   S 
                   = 
                   
                     
                       
                         
                           S 
                           ⊥ 
                           2 
                         
                         + 
                         
                           S 
                           // 
                           2 
                         
                       
                       2 
                     
                     = 
                     
                       
                         h 
                         A 
                       
                       × 
                       F 
                       × 
                       
                         
                           
                             
                               ( 
                               
                                 
                                   cos 
                                   ⁡ 
                                   ( 
                                   θ 
                                   ) 
                                 
                                 / 
                                 E 
                               
                               ) 
                             
                             2 
                           
                           + 
                           
                             
                               ( 
                               
                                 
                                   sin 
                                   ⁡ 
                                   ( 
                                   θ 
                                   ) 
                                 
                                 / 
                                 G 
                               
                               ) 
                             
                             2 
                           
                         
                         2 
                       
                     
                   
                 
               
               
                 
                   ( 
                   7 
                   ) 
                 
               
             
           
         
       
     
     When the Poisson&#39;s ratio of the skin is 0.4, a relationship between the angle θ and the total skin deformation may be found elsewhere in the present disclosure. See, e.g.,  FIG.  18    and the relevant descriptions thereof. 
       FIG.  18    is a schematic diagram illustrating a relationship between an angle and a relative displacement of an exemplary speaker device according to some embodiments of the present disclosure. As shown in  FIG.  18   , a relationship between an angle and a total deformation of the skin may be that the greater angle and/or the greater the relative displacement is, the greater the total deformation is. A skin deformation S ⊥  perpendicular to the skin may decrease as the angle θ increases, and/or the relative displacement decreases. When the angle θ is close to 90°, the deformation s ⊥  may gradually tend to zero. 
     In some embodiments, a part of a volume of the speaker device in a low frequency may be a positive correlation with the total skin deformation S. The greater the S is, the greater the part of the volume in the low frequency is. A part of the volume of the loudspeaker device in a high frequency may be a positive correlation with the total skin deformation S ⊥ . The greater the total skin deformation s ⊥  is, the greater the part of the volume in the high frequency is. 
     Further, when the Poisson&#39;s ratio of the skin is 0.4, more descriptions regarding the relationship between the angle θ, the total skin deformation S, and the S ⊥  may be described in  FIG.  18   . As shown in  FIG.  18   , the relationship between the angle θ and the total skin deformation S may be that the greater the angle θ is, the greater the total skin deformation S is, and accordingly, the greater the part of the volume of the loudspeaker device in the low frequency is. As shown in  FIG.  18   , the relationship between the angle θ and the total skin deformation S may be that the greater the angle θ is, the less the t s ⊥  is, and accordingly, the less the part of the volume in the high frequency is. 
     As shown in Equation (7) and  FIG.  18   , an increasing speed of the total skin deformation S and a decreasing speed of the s ⊥  may be different. The increasing speed of the total skin deformation S may be from a relatively fast speed to a relatively slow speed. The decreasing speed of the s ⊥  may be faster and faster. The angle θ may be determined to balance the part of the volume of the speaker device in the low frequency and the part of the volume of the speaker device in the high frequency. For example, a range of the angle θ may be 5°˜80°, 15°˜70°, 25°˜50°, 25°˜35°, 25°˜30°, or the like. 
       FIG.  19    is a schematic diagram illustrating a low frequency part of a frequency response curve of an exemplary speaker device corresponding to different angles  8  according to some embodiments of the present disclosure. As shown in  FIG.  19   , a panel  301  is in contact with the skin and transmits vibration to the skin. In this process, the skin may affect the vibration of the speaker device, thereby affecting the frequency response curve of the speaker device. As the descriptions described above, the greater the angle θ is, the greater the total skin deformation is under ‘a same driving force. For the speaker device, the total skin deformation may be equivalent to the reduction of the elasticity of the skin relative to the panel  301 . It can be understood that when a line where the driving force of the driving device  101  locates and a normal line of an area of the panel  301 , which is connected or abut against a user&#39;s body may form the angle θ, in particular, when the angle θ increases, a resonance peak of the low frequency part in the frequency response curve may be adjusted to a relatively low frequency part, thereby lowing the low frequency dive deeper and increasing the low frequency. Compared with other technical means to improve the low-frequency components of a sound, for example, adding a vibration plate to the speaker device, setting the angle θ to improve the low frequency energy may effectively reduce the vibration sense, further significantly improving the low frequency sensitivity of the speaker device, the sound quality, and the human experience. It should be noted that, in some embodiments, the increased low frequency and the reduced vibration sense may be represented by that when the angle θ increases in the range of (0, 90°), the energy of the vibration or sound signal in the low frequency range increases, and the vibration sense may be increased. The increasement of the energy in the low-frequency range may be greater than the increasement of the vibration sense. For relative effects, the vibration sense may be relatively reduced. It can be seen from  FIG.  19    that when the angle θ is relatively great, the resonance peak in the low frequency area may appear in a relatively low frequency range, which may extend a flat part of the frequency curvature in disguise, thereby improving the sound quality of the speaker device. 
     It should be noted that the above descriptions regarding the speaker device are only some specific examples and should not be regarded as the only feasible implementations. Obviously, for those skilled in the art, after understanding the basic principle of the speaker device, it is possible to make various modifications and changes in forms and details to the implementation mode of the speaker device. However, those variations, changes, and modifications do not depart from the scope of the present disclosure. For example, the minimum angle θ between the line where the driving force locates and the normal line of the area on the panel that is in contact with or abuts against the user&#39;s body may be any acute angle, and the acute angle here is not limited to the above described 5°˜80°. In some embodiments, the angle θ may be less than 5°, such as 1°, 2°, 3°, 4°, etc. In some embodiments, the angle θ may be greater than 80° and less than 90°, such as 81°, 82°, 85°, etc. In some embodiments, the specific value of the angle θ may not be an integer (e.g., 81.3°, 81.38°, etc.). Such variations are all within the protection scope of the present disclosure. 
       FIG.  20    is a schematic diagram illustrating a longitudinal cross-sectional of an exemplary speaker device according to some embodiments of the present disclosure. It should be understood that the following descriptions described below can also be applied to an air conduction speaker device and a bone conduction speaker device without violating the principle. 
     As shown in  FIG.  20   , in some embodiments, the speaker device may include a first magnetic element  202 , a first magnetically conductive element  204 , a second magnetically conductive element  206 , a first vibration plate  208 , a voice coil  110 , a second vibration plate  112 , and a vibration panel  114 . In some embodiments, one or more components of a headphone core of a bone conduction speaker device may form a magnetic circuit assembly. In some embodiments, the magnetic circuit assembly may include a first magnetic element  102 , a first magnetically conductive element  104 , and a second magnetically conductive element  106 . The magnetic circuit assembly may generate a first full magnetic field (also referred to as a total magnetic field of the magnetic circuit assembly or a first magnetic field). 
     A magnetic element described in the present disclosure refers to an element that generates a magnetic field, such as magnets. The magnetic element may have a magnetization direction, and the magnetization direction refers to a direction of a magnetic field inside the magnetic element. In some embodiments, the first magnetic element  202  may include one or more magnets, and the first magnetic element may generate a second magnetic field. In some embodiments, the magnet may include a metal alloy magnet, ferrite, or the like. The metal alloy magnet may include neodymium iron boron, samarium cobalt, aluminum nickel cobalt, iron chromium cobalt, aluminum iron boron, iron carbon aluminum, or the like, or any combination thereof. The ferrite may include barium ferrite, steel ferrite, manganese ferrite, lithium manganese ferrite, or the like, or any combination thereof. 
     In some embodiments, a lower surface of the first magnetically conductive element  204  may be connected to an upper surface of the first magnetic element  202 . The second magnetically conductive element  206  may be connected to the first magnetic element  202 . It should be noted that a magnetically conductive element is also referred to as a magnetic field concentrator or an iron core. The magnetic conductor may adjust the distribution of a magnetic field (e.g., the second magnetic field generated by the first magnetic element  202 ). The magnetic conductor may include an element processed from soft magnetic material. In some embodiments, the soft magnetic material may include metal material, metal alloy, metal oxide material, amorphous metal material, etc., such as iron, iron-silicon alloy, iron-aluminum alloy, nickel-iron alloy, iron-cobalt alloy, low carbon steel, silicon steel sheet, silicon steel sheet, ferrite, etc. In some embodiments, the magnetically conductive element may be processed by casting, plastic processing, cutting processing, powder metallurgy, or the like, or any combination thereof. The casting may include sand casting, investment casting, pressure casting, centrifugal casting, etc. The plastic processing may include rolling, casting, forging, stamping, extrusion, drawing, etc. The cutting processing may include turning, milling, planing, grinding, etc. In some embodiments, the processing of the magnetically conductive element may also include 3D printing, numerically-controlled machine tools, and the like. A connection between the first magnetically conductive element  204 , the second magnetically conductive element  206 , and the first magnetic element  202  may include bonding, clamping, welding, riveting, bolting, or the like, or any combination thereof. In some embodiments, the first magnetic element  202 , the first magnetically conductive element  204 , and the second magnetically conductive element  206  may be arranged in an axisymmetric structure. The axisymmetric structure may be a ring structure, a columnar structure, or other axisymmetric structures. 
     In some embodiments, a magnetic gap may be formed between the first magnetic element  202  and the second magnetically conductive element  206 . The voice coil  110  may be disposed in the magnetic gap. The voice coil  110  may be connected to the first vibration plate  208 . The first vibration plate  208  may be connected to the second vibration plate  112 , and the second vibration plate  112  may be connected to the vibration panel  114 . When current is applied to the voice coil  110 , the voice coil  110  may be located in a magnetic field formed by the first magnetic element  202 , the first magnetically conductive element  204 , and the second magnetically conductive element  206 , and subjected to ampere force. The ampere force may drive the voice coil  110  to vibrate, and the vibration of the voice coil  110  may drive the first vibration plate  208 , the second vibration plate  112 , and the vibration panel  114  to vibrate. The vibration panel  114  may transmit the vibration to the auditory nerve through the tissues and bones so that a user can hear a sound. The vibration panel  114  may directly contact the user&#39;s skin or may contact the user&#39;s skin through a vibration transmission layer composed of a specific material. 
     In some embodiments, for a speaker device with a single magnetic element, the magnetic induction lines passing through the voice coil  110  may be not uniform and divergent. In addition, magnetic leakage may be formed in the magnetic circuit, that is, some magnetic induction lines may leak out of the magnetic gap and fail to pass through the voice coil  110 , thereby reducing the magnetic induction intensity (or magnetic field intensity) at the position of the voice coil  110 , and affecting the sensitivity of the speaker device. The speaker device may further include at least one second magnetic element and/at least one third magnetic element (not shown in the figure). The at least one second magnetic element and/or the at least one third magnetic element may suppress the leakage of the magnetic induction lines, and restrict the shape of the magnetic induction lines passing through the voice coil  110 , so that relatively more magnetic induction lines may horizontally and densely pass through the voice coil  110 , thereby improving the magnetic induction intensity (or magnetic field intensity) at the position of the voice coil  110 , the sensitivity of the speaker device, and the mechanical conversion efficiency of the speaker device (i.e., the efficiency of converting the electrical energy inputted into the speaker device  100  into the mechanical energy of the voice coil  110 ). 
       FIG.  21    is a schematic diagram illustrating a longitudinal cross-sectional of an exemplary magnetic circuit assembly according to some embodiments of the present disclosure. As shown in  FIG.  21   , the magnetic circuit assembly  2100  may include a first magnetic element  202 , a first magnetically conductive element  204 , a second magnetically conductive element  206 , and a second magnetic element  208 . 
     In some embodiments, the magnetic circuit assembly described in the above embodiments may be of the same structure, which may refer to a structure that provides a magnetic field. In some embodiments, the first magnetic element  202  and/or the second magnetic element  208  may include any one or several types of magnets described in the present disclosure. In some embodiments, the first magnetic element  202  may include a first magnet, and the second magnetic element  208  may include a second magnet. The first magnet and the second magnet may be the same or different. The first magnetically conductive element  204  and/or the second magnetically conductive element  206  may include one or more of the magnetically conductive materials described in the present disclosure. A processing manner of the first magnetically conductive element  204  and/or the second magnetically conductive element  206  may include any one or several processing manners described in the present disclosure. In some embodiments, the first magnetic element  202  and/or the first magnetically conductive element  204  may include an axisymmetric structure. For example, the shape of the first magnetic element  202  and/or first magnetically conductive element  204  may be a cylinder, a rectangular parallelepiped, or a hollow ring shape (e.g., with a cross section in the shape of a racetrack). In some embodiments, the first magnetic element  202  and the first magnetically conductive element  204  may be coaxial cylinders with the same or different diameters. In some embodiments, the second magnetically conductive element  206  may include a groove-type structure. The groove-type structure may include a U-shaped section (as shown in  FIG.  21   ). The groove-shaped second magnetically conductive element  206  may include a bottom plate and a side wall. In some embodiments, the bottom plate and the side wall may be integrally formed. For example, the side wall may be formed by extending the bottom plate along a direction perpendicular to the bottom plate. In some embodiments, the bottom plate may be connected to the side wall via one or more connection manners described according to some embodiments of the present disclosure. A shape of the second magnetic element  208  may include a ring, a sheet, etc. In some embodiments, the shape of the second magnetic element  208  may be a ring. The second magnetic element  208  may include an inner ring and an outer ring. In some embodiments, the shape of the inner ring and/or the outer ring may be a circle, an ellipse, a triangle, a quadrilateral, or other polygons. In some embodiments, the second magnetic element  208  may be formed by arranging a plurality of magnets. Two ends of each of the plurality of magnets may be connected to two ends of an adjacent magnet or a distance may be formed between two adjacent magnets of the plurality of magnets. The distance between each two adjacent magnets of the plurality of magnets may be the same or different. In some embodiments, the magnetic element may be formed by arranging two or three piece-shaped magnets equidistantly. A shape of the sheet-shaped magnet may include a fan, a quadrangle, etc. In some embodiments, the second magnetic element  208  may be coaxial with the first magnetic element  202  and/or the first magnetically conductive element  204 . 
     Further, the upper surface of the first magnetic element  202  may be connected to the lower surface of the first magnetically conductive element  204 . The lower surface of the first magnetic element  202  may be connected to the bottom plate of the second magnetically conductive element  206 . The bottom surface of the second magnetic element  208  may be connected to the side wall of the second magnetically conductive element  206 . The connection between the first magnetic element  202 , the first magnetically conductive element  204 , the second magnetically conductive element  206 , and/or the second magnetic element  208  may include a bonding connection, a clamping connection, a welding connection, a riveting connection, a bolting connection, or the like, or any combination thereof. 
     In some embodiments, a magnetic gap may be formed between the inner ring of the first magnetic element  202  and/or the first magnetically conductive element  204  and the second magnetic element  208 . The voice coil  238  may be disposed in the magnetic gap. In some embodiments, a height of the voice coil  238  of the second magnetic element  208  relative to the bottom plate of the second magnetically conductive element  206  may be equal. 
     In some embodiments, the first magnetic element  202 , the first magnetically conductive element  204 , the second magnetically conductive element  206 , and the second magnetic element  208  may form a magnetic circuit. In some embodiments, the magnetic circuit assembly  2100  may generate a first full magnetic field (also referred to as “total magnetic field of the magnetic circuit assembly” or a “first magnetic field”), and the first magnetic element  202  may generate a second magnetic field. The first full magnetic field may be formed by magnetic fields generated by one or more components (e.g., the first magnetic element  202 , the first magnetically conductive element  204 , the second magnetically conductive element  206 , and/or the second magnetic element  208 ) of the magnetic circuit assembly  2100 . 
     In some embodiments, a magnetic field intensity (also referred to as a magnetic induction or a magnetic flux density) of the first full magnetic field in the magnetic gap may be greater than a magnetic field intensity of the second magnetic field in the magnetic gap. In some embodiments, the second magnetic element  208  may generate a third magnetic field, which may improve the magnetic field intensity of the first full magnetic field at the magnetic gap. The improvement of the magnetic field intensity of the first full magnetic field caused by the third magnetic field mentioned may refer to that when the third magnetic field exists (i.e., the second magnetic element  208  exists), the magnetic field intensity of the first full magnetic field in the magnetic gap may be greater than that when the third magnetic field does not exist (i.e., the second magnetic element  208  does not exist). In other embodiments of the present disclosure, unless otherwise specified, the magnetic circuit assembly refers to a structure that may include one or more of the magnetic elements and the magnetically conductive element. The first full magnetic field refers to the magnetic field generated by the magnetic circuit assembly as a whole, and the second magnetic field, the third magnetic field, . . . , or the Nth magnetic field refers to a magnetic field generated by a corresponding magnetic element. In different embodiments, the magnetic elements that generate the second magnetic fields (the third magnetic field, . . . , or the Nth magnetic field) may be the same or different. 
     In some embodiments, the voice coils described in the above embodiments may be of the same structure, which may refer to a structure that transmits audio signals. In some embodiments, the magnetic circuit assembly described in the above embodiments may be of the same structure, which c. 
     In some embodiments, an angle between a magnetization direction of the first magnetic element  202  and a magnetization direction of the second magnetic element  208  may be between 0° and 180°. In some embodiments, the angle between the magnetization direction of the first magnetic element  202  and the magnetization direction of the second magnetic element  208  may be between 45° and 135°. In some embodiments, the angle between the magnetization direction of the first magnetic element  202  and the magnetization direction of the second magnetic element  208  may be equal to or greater than 90°. In some embodiments, the magnetization direction of the first magnetic element  202  may vertically upwards and be perpendicular to the lower surface or the upper surface of the first magnetic element  202  (e.g., a direction indicated by the arrow a in  FIG.  21   ). The magnetization direction of the second magnetic element  208  may be from the inner ring to the outer ring of the second magnetic element  208  (e.g., a direction indicated by the arrow b in  FIG.  21   , that is, on a right side of the first magnetic element  202 , the magnetization direction of the first magnetic element  202  may be deflected by 90° in the clockwise direction). 
     In some embodiments, at a position of the second magnetic element  208 , the angle between the direction of the first full magnetic field and the magnetization direction of the second magnetic element  208  may be not greater than 90°. In some embodiments, at the position of the second magnetic element  208 , the angle between the direction of the magnetic field generated by the first magnetic element  202  and the magnetization direction of the second magnetic element  208  may be equal to or less than 90°, such as 0°, 10°, or 20°, etc. Further, compared with a magnetic circuit assembly of a single magnetic element, the second magnetic element  208  may increase a total magnetic flux in the magnetic gap in the magnetic circuit assembly  2100 , thereby increasing the magnetic induction intensity in the magnetic gap. In addition, under the action of the second magnetic element  208 , originally diverging magnetic lines of force may converge to the position of the magnetic gap, further increasing the magnetic induction intensity in the magnetic gap. 
       FIG.  22    is a schematic diagram illustrating a longitudinal cross-sectional of an exemplary magnetic circuit assembly according to some embodiments of the present disclosure. As shown in  FIG.  22   , the magnetic circuit assembly  2600  may be similar to the magnetic circuit assembly  2100  except that the magnetic circuit assembly  2600  may include at least one conductive element (e.g., a first conductive element  248 , a second conductive element  250 , or a third conductive element  252 ). 
     In some embodiments, each of the at least one conductive element may include a metallic material, metallic alloy material, inorganic non-metallic material, or other conductive materials. The metallic material may include gold, silver, copper, aluminum, etc. The metallic alloy material may include iron-based alloy material, aluminum-based alloy material, copper-based alloy material, zinc-based alloy material, etc. The inorganic non-metallic material may include graphite, etc. A shape of the conductive element may include a sheet, a ring, a mesh, etc. The first conductive element  248  may be disposed on the upper surface of the first magnetically conductive element  204 . The second conductive element  250  may be connected to the first magnetic element  202  and the second magnetically conductive element  206 . The third conductive element  252  may be connected to the sidewall of the first magnetic element  202 . In some embodiments, the first magnetically conductive element  204  may protrude from the first magnetic element  202  to form a first recess, and the third conductive element  252  may be disposed in the first recess. In some embodiments, the first conductive element  248 , the second conductive element  250 , and the third conductive element  252  may include the same or different conductive materials. The first conductive element  248 , the second conductive element  250 , and the third conductive element  252  may be connected to the first magnetically conductive element  204 , the second magnetically conductive element  206 , and/or the first magnetic element  202  via various connection manner described in the present disclosure. 
     In some embodiments, a magnetic gap is formed between the inner ring of the first magnetic element  202 , the first magnetically conductive element  204 , and the second magnetic element  208 . The voice coil  238  may be disposed in the magnetic gap. The first magnetic element  202 , the first magnetically conductive element  204 , the second magnetically conductive element  206 , and the second magnetic element  208  may form a magnetic circuit. In some embodiments, a conductive element may reduce the inductive reactance of the voice coil  238 . For example, when the voice coil  238  is supplied with a first alternating current, a first alternating induced magnetic field may be generated near the voice coil  238 . Under the action of the magnetic field in the magnetic circuit, the first alternating induced magnetic field may cause the voice coil  238  to generate inductive reactance and hinder the movement of the voice coil  238 . When a conductive element (e.g., the first conductive element  248 , the second conductive element  250 , or the third conductive element  252 ) is arranged near the voice coil  238 , the conductive element may induce a second alternating current under the action of the first alternating induced magnetic field. The third alternating current in the conductive element may generate a second alternating induced magnetic field in the surroundings of the conductive element. A direction of the second alternating induced magnetic field may be opposite to that of the first alternating induced magnetic field, thereby weakening the first alternating induced magnetic field, reducing the inductive reactance of the voice coil  238 , increasing the current in the voice coil, and improving the sensitivity of a speaker device. 
       FIG.  23    is a schematic diagram illustrating a longitudinal cross-sectional of an exemplary speaker device according to some embodiments of the present disclosure. As shown in  FIG.  23   , a magnetic circuit assembly  2700  may be similar to the magnetic circuit assembly  2500  except that the magnetic circuit assembly  2700  may include a third magnetic element  510 , a fourth magnetic element  512 , a fifth magnetic element  514 , a third magnetically conductive element  516 , a sixth magnetic element  524 , and a seventh magnetically conductive element  526 . The third magnetic element  510 , the fourth magnetic element  512 , the fifth magnetic element  514 , the third magnetically conductive element  516 , the sixth magnetic element  524 , and/or the seventh magnetically conductive element  526  may be arranged as a coaxial annular cylinder. 
     In some embodiments, the magnetic circuit assembly described in the above embodiments may refer to a structure that provides a magnetic field. 
     In some embodiments, the upper surface of the second magnetic element  208  may be connected to the seventh magnetically conductive element  526 , and the lower surface of the second magnetic element  208  may be connected to the third magnetic element  510 . The third magnetic element  510  may be connected to the second magnetically conductive element  206 . The upper surface of the seventh magnetically conductive element  526  may be connected to the third magnetically conductive element  516 . The fourth magnetic element  512  may be connected to the second magnetically conductive element  206  and the first magnetic element  202 . The sixth magnetic element  524  may be connected to the fifth magnetic element  514 , the third magnetically conductive element  516 , and the seventh magnetically conductive element  526 . In some embodiments, the first magnetic element  202 , the first magnetically conductive element  204 , the second magnetically conductive element  206 , the second magnetic element  208 , the third magnetic element  510 , the fourth magnetic element  512 , the fifth magnetic element  514 , the third magnetically conductive element  516 , the sixth magnetic element  524 , and the seventh magnetically conductive element  526  may form a magnetic circuit and a magnetic gap. 
     In some embodiments, an angle between the magnetization direction of the first magnetic element  202  and a magnetization direction of the sixth magnetic element  524  may be between 0° and 180°. In some embodiments, the angle between the magnetization direction of the first magnetic element  202  and the sixth magnetic element  524  may be between 45° and 135°. In some embodiments, the angle between the magnetization direction of the first magnetic element  202  and the magnetization direction of the sixth magnetic element  524  may be not greater than 90°. In some embodiments, the magnetization direction of the first magnetic element  202  may be perpendicular to the lower surface or the upper surface of the first magnetic element  202  (as indicated by the arrow a in  FIG.  22   ), and the magnetization direction of the sixth magnetic element  524  may be from an outer ring of the sixth magnetic element  524  to an inner ring (as indicated by the arrow g in  FIG.  22   , that is, on the right side of the first magnetic element  202 , the magnetization direction of the first magnetic element  202  may be deflected by 270 degrees in the clockwise direction). In some embodiments, in the same vertical direction, the magnetization direction of the sixth magnetic element  524  and the magnetization direction of the fourth magnetic element  512  may be the same. 
     In some embodiments, at a position of the sixth magnetic element  524 , the angle between the direction of the magnetic field generated by the magnetic circuit assembly  2700  and the magnetization direction of the sixth magnetic element  524  may be not greater than 90°. In some embodiments, at the position of the sixth magnetic element  524 , the angle between the direction of the magnetic field generated by the first magnetic element  202  and the magnetization direction of the sixth magnetic element  524  may be equal to or less than 90°, such as 0°, 10°, or 20°, etc. 
     In some embodiments, the angle between the magnetization direction of the first magnetic element  202  and a magnetization direction of the seventh magnetically conductive element  526  may be between 0° and 180°. In some embodiments, the angle between the magnetization direction of the first magnetic element  202  and the magnetization direction of the seventh magnetically conductive element  526  may be between 45° and 135°. In some embodiments, the angle between the magnetization direction of the first magnetic element  202  and the magnetization direction of the seventh magnetically conductive element  526  may be not greater than 90°. In some embodiments, the magnetization direction of the first magnetic element  202  may be perpendicular to the lower or upper surface of the first magnetic element  202  (as indicated by the arrow a in  FIG.  23   ). A magnetization direction of the seventh magnetically conductive element  526  may be from a lower surface of the seventh magnetically conductive element  526  to an upper surface of the seventh magnetically conductive element  526  (as indicated by the arrow fin  FIG.  23   , that is, on the right side of the first magnetic element  202 , the magnetization direction of the first magnetic element  202  may be deflected by 360° in the clockwise direction). In some embodiments, the magnetization direction of the seventh magnetically conductive element  526  may be opposite to that of the third magnetic element  510 . 
     In some embodiments, at a position of the seventh magnetically conductive element  526 , an angle between the direction of the magnetic field generated by the magnetic circuit assembly  2700  and the magnetization direction of the seventh magnetically conductive element  526  may be not greater than 90°. In some embodiments, at the position of the seventh magnetically conductive element  526 , the angle between the direction of the magnetic field generated by the first magnetic element  202  and the magnetization direction of the seventh magnetically conductive element  526  may be equal to or less than 90°, such as 0°, 10°, or 20°, etc. 
     In the magnetic circuit assembly  2700 , the third magnetically conductive element  516  may close the magnetic circuit generated by the magnetic circuit assembly  2700 , so that relatively more magnetic induction lines are concentrated in the magnetic gap, thereby suppressing magnetic leakage, increasing the magnetic induction at the magnetic gap, and improving the sensitivity of the speaker device. 
       FIG.  24    is a schematic diagram illustrating a longitudinal cross-sectional of an exemplary speaker device according to some embodiments of the present disclosure. As shown in  FIG.  24   , a magnetic circuit assembly  3100  may include a first magnetic element  602 , a first magnetically conductive element  604 , a first full magnetic field changing element  606 , and a second magnetic element  608 . 
     In some embodiments, the first magnetic element described in the above embodiments may refer to an element of energy storage, energy conversion, and electrical isolation. Similarly, the second magnetic element may also follow this principle. The magnetically conductive element may refer to an element configured to form a magnetic field loop. In some embodiments, an upper surface of the first magnetic element  602  may be connected to a lower surface of the first magnetically conductive element  604 , and the second magnetic element  608  may be connected to the first magnetic element  602  and the first full magnetic field changing element  606 . 
     The first magnetic element  602 , the first magnetically conductive element  604 , the first full magnetic field changing element  606 , and/or the second magnetic element  608  may be connected via various connection manners as described in the present disclosure. In some embodiments, the first magnetic element  602 , the first magnetically conductive element  604 , the first full magnetic field changing element  606 , and/or the second magnetic element  608  may form a magnetic circuit and a magnetic gap. 
     In some embodiments, the magnetic circuit assembly  3100  may generate a first full magnetic field, and the first magnetic element  602  may generate a second magnetic field. The magnetic field intensity of the first full magnetic field in the magnetic gap may be greater than the magnetic field intensity of the second magnetic field in the magnetic gap. In some embodiments, the second magnetic element  608  may generate a third magnetic field, which may improve the magnetic field intensity of the second magnetic field at the magnetic gap. 
     In some embodiments, an angle between a magnetization direction of the first magnetic element  602  and a magnetization direction of the second magnetic element  608  may be between 0° and 180°. In some embodiments, the angle between the magnetization direction of the first magnetic element  602  and the magnetization direction of the second magnetic element  608  may be between 45° and 135°. In some embodiments, the angle between the magnetization direction of the first magnetic element  602  and the magnetization direction of the second magnetic element  608  may be not greater than 90°. 
     In some embodiments, at a position of the second magnetic element  608 , an angle between a direction of the first full magnetic field and the magnetization direction of the second magnetic element  608  may be not greater than 90°. In some embodiments, at the position of the second magnetic element  608 , an angle between the direction of the magnetic field generated by the first magnetic element  602  and the magnetization direction of the second magnetic element  608  may be equal to or less than 90°, such as 0°, 10°, 20°, etc. As another example, the magnetization direction of the first magnetic element  602  may vertically upwards and be perpendicular to the lower surface or the upper surface of the first magnetic element  602  (as indicated by the arrow a in  FIG.  24   ). The magnetization direction of the second magnetic element  608  may be from an outer ring of the second magnetic element  608  to an inner ring of the second magnetic element  608  (as indicated by the arrow c in  FIG.  24   , that is, on a right side of the first magnetic element  602 , the magnetization direction of the first magnetic element  602  may be deflected by 270° in the clockwise direction). Compared with a magnetic circuit assembly of a single magnetic element, the first full magnetic field changing element  606  of the magnetic circuit assembly  3100  may increase a total magnetic flux in the magnetic gap in the magnetic circuit assembly  2100 , thereby increasing the magnetic induction intensity in the magnetic gap. In addition, under the action of the first full magnetic field changing element  606 , originally diverging magnetic lines of force may converge to the position of the magnetic gap, further increasing the magnetic induction intensity in the magnetic gap. 
       FIG.  25    is a schematic diagram illustrating a longitudinal cross-section of an exemplary speaker device according to some embodiments of the present disclosure. As shown in  FIG.  25   , a magnetic circuit assembly  3700  may include a first magnetic element  602 , a first magnetically conductive element  604 , a first full magnetic field changing element  606 , a second magnetic element  608 , and a third magnetic element  610 , a fourth magnetic element  612 , a fifth magnetic element  616 , a sixth magnetic element  618 , a seventh magnetic element  620 , and a second ring element  622 . In some embodiments, the first full magnetic field changing element  606  and/or the second ring element  622  may include a ring magnetic element or a ring magnetically conductive element. 
     In some embodiments, the ring magnetic element may one or more magnetic materials described in the present disclosure, and the ring magnetically conductive element may include one or more magnetically conductive materials described in the present disclosure. In some embodiments, the magnetic circuit assembly described in the above embodiments may refer to a structure that provides a magnetic field. In some embodiments, the magnetic elements described in the present disclosure may refer to an element of energy storage, energy conversion, and electrical isolation. In some embodiments, the magnetically conductive element may refer to an element configured to form a magnetic field loop. 
     In some embodiments, the sixth magnetic element  618  may be connected to the fifth magnetic element  616  and the second ring element  622 , and the seventh magnetic element  620  may be connected to the third magnetic element  610  and the second ring element  622 . In some embodiments, the first magnetic element  602 , the fifth magnetic element  616 , the second magnetic element  608 , the third magnetic element  610 , the fourth magnetic element  612 , the sixth magnetic element  618 , and/or the seventh magnetic element  620  and the first magnetically conductive element  604 , the first full magnetic field changing element  606 , and the second ring element  622  may form a magnetic circuit. 
     In some embodiments, an angle between a magnetization direction of the first magnetic element  602  and the magnetization direction of the sixth magnetic element  618  may be between 0° and 180°. In some embodiments, the angle between the magnetization direction of the first magnetic element  602  and the magnetization direction of the sixth magnetic element  618  may be between 45° and 135°. In some embodiments, the angle between the magnetization direction of the first magnetic element  602  and the magnetization direction of the sixth magnetic element  618  may be not greater than 90°. In some embodiments, the magnetization direction of the first magnetic element  602  may be perpendicular to a lower surface or an upper surface of the first magnetic element  602  (as indicated by the arrow a in  FIG.  25   ), and the magnetization direction of the sixth magnetic element  618  may be from an outer ring of the magnetic element  618  to an inner ring of the sixth magnetic element  618  (as indicated by the arrow f  FIG.  25   , that is, on a right side of the first magnetic element  602 , the magnetization direction of the first magnetic element  602  may be deflected by 270° in the clockwise direction). In some embodiments, in a same vertical direction, the magnetization direction of the sixth magnetic element  618  and the magnetization direction of the second magnetic element  608  may be the same. In some embodiments, the magnetization direction of the first magnetic element  602  may be perpendicular to the lower or upper surface of the first magnetic element  602  (as indicated by the arrow a in  FIG.  25   ), and the magnetization direction of the seventh magnetic element  620  may be from the lower surface of the seventh magnetic element  620  to the upper surface of the seventh magnetic element  620  (as indicated by the arrow e in  FIG.  25   , that is, on the right side of the first magnetic element  602 , the magnetization direction of the first magnetic element  602  may be deflected 360° in the clockwise direction). In some embodiments, the magnetization direction of the seventh magnetic element  620  and the magnetization direction of the fourth magnetic element  612  may be the same. 
     In some embodiments, at a position of the sixth magnetic element  618 , an angle between a direction of the magnetic field generated by the magnetic circuit assembly  3700  and the magnetization direction of the sixth magnetic element  618  may be not greater than 90°. In some embodiments, at the position of the sixth magnetic element  618 , an angle between a direction of the magnetic field generated by the first magnetic element  602  and the magnetization direction of the sixth magnetic element  618  may be less than or equal to 90°, such as 0°, 10°, 20°, etc. 
     In some embodiments, an angle between the magnetization direction of the first magnetic element  602  and a magnetization direction of the seventh magnetic element  620  may be between 0° and 180°. In some embodiments, the angle between the magnetization direction of the first magnetic element  602  and the magnetization direction of the seventh magnetic element  620  may be between 45° and 135°. In some embodiments, the angle between the magnetization direction of the first magnetic element  602  and the magnetization direction of the seventh magnetic element  620  may be not greater than 90°. 
     In some embodiments, at a position of the seventh magnetic element  620 , an angle between the direction of the magnetic field generated by the magnetic circuit assembly  3700  and the magnetization direction of the seventh magnetic element  620  may be not greater than 90°. In some embodiments, at the position of the seventh magnetic element  620 , the angle between the direction of the magnetic field generated by the first magnetic element  602  and the magnetization direction of the seventh magnetic element  620  may be less than or equal to 90°, such as 0°, 10°, 20°, etc. 
     In some embodiments, the first full magnetic field changing element  606  may be a ring magnetic element. In this case, the magnetization direction of the first full magnetic field changing element  606  may be the same as the magnetization direction of the second magnetic element  608  or the fourth magnetic element  612 . For example, on the right side of the first magnetic element  602 , the magnetization direction of the first full magnetic field changing element  606  may be from an outer ring of the first full magnetic field changing element  606  to an inner ring of the first full magnetic field changing element  606 . In some embodiments, the second ring element  622  may be an ring magnetic element. In this case, a magnetization direction of the second ring element  622  may be the same as the magnetization direction of the sixth magnetic element  618  or the seventh magnetic element  620 . For example, on the right side of the first magnetic element  602 , the magnetization direction of the second ring element  622  may be from the outer ring of the second ring element  622  to the inner ring of the second ring element  622 . In the magnetic circuit assembly  3700 , one or more magnetic elements may increase the total magnetic flux. The interaction between different magnetic elements may prevent the leakage of magnetic lines, increase the magnetic induction intensity at the magnetic gap, and improve the sensitivity of the speaker device. 
     In some embodiments, based on the magnetic circuit assembly  3700 , a magnetic circuit assembly may further include a magnetic conductive cover. The magnetic conductive cover may include one or more magnetic materials described in the present disclosure, e.g., low carbon steel, silicon steel sheet, silicon steel sheet, ferrite, etc. The magnetic conductive cover may be connected to the first magnetic element  602 , the first full magnetic field changing element  606 , the second magnetic element  608 , the third magnetic element  610 , the fourth magnetic element  612 , the fifth magnetic element  616 , the sixth magnetic element  618 , the seventh magnetic element  620 , and/or the second ring element  622  via one or more connection manners described in the present disclosure. In some embodiments, the magnetic conductive cover may include at least one bottom plate and a side wall, and the side wall may have a ring structure. In some embodiments, the bottom plate and the side wall may be integrally formed. In some embodiments, the bottom plate may be connected to the side wall via or more connection manners described in the present disclosure. For example, the magnetic conductive cover may include a first bottom plate, a second bottom plate, and the side wall. The first bottom plate and the side wall may be integrally formed, and the second bottom plate may be connected to the side wall via one or more connection manners described in the present disclosure. 
     In the magnetic circuit assembly  3100 , the magnetic conductive cover may close the magnetic circuit generated by the magnetic circuit assembly  3100 , so that relatively more magnetic induction lines may be concentrated in the magnetic gap in the magnetic circuit assembly  3100  to suppress magnetic leakage, increase the magnetic induction intensity in the magnetic gap, and improve the sensitivity of the speaker device. 
     It should be noted that a magnetic circuit assembly described in the above embodiments may refer to a structure that provides a magnetic field. 
     In some embodiments, based on the magnetic circuit assembly  3100 , a magnetic circuit assembly may further include one or more conductive elements (e.g., a first conductive element, a second conductive element, a third conductive element, etc.). More descriptions regarding the conductive element(s) may be similar to that of the conductive element  218 , the conductive element  220 , and the conductive element  222 , and the related descriptions are not repeated here. 
       FIG.  26    is a schematic diagram illustrating a longitudinal cross-sectional of an exemplary magnetic circuit assembly according to some embodiments of the present disclosure. As shown in  FIG.  26   , the magnetic circuit assembly  4100  may include a first magnetic element  402 , a first magnetically conductive element  404 , a second magnetically conductive element  406 , and a second magnetic element  408 . 
     It should be noted that the magnetic circuit assembly described in the above embodiments may refer to a structure that provides a magnetic field. The magnetic element described in the above embodiments may refer to an element of energy storage, energy conversion, and electrical isolation. The magnetically conductive element may refer to an element configured to form a magnetic field loop. 
     In some embodiments, the first magnetic element  402  and/or the second magnetic element  408  may include one or more magnets described in the present disclosure. In some embodiments, the first magnetic element  402  may include a first magnet, and the second magnetic element  408  may include a second magnet. The first magnet and the second magnet may be the same or different. The first magnetically conductive element  404  and/or the second magnetically conductive element  406  may include one or more magnetically conductive element materials described in the present disclosure. A processing manner of the first magnetically conductive element  404  and/or the second magnetically conductive element  406  may include one or more processing manners described in the present disclosure. In some embodiments, the first magnetic element  402 , the first magnetically conductive element  404 , and/or the second magnetic element  408  may include an axisymmetric structure. For example, the first magnetic element  402 , the first magnetically conductive element  404 , and/or the second magnetic element  408  may be cylindrical. In some embodiments, the first magnetic element  402 , the first magnetically conductive element  404 , and/or the second magnetic element  408  may be coaxial cylinders with the same or different diameters. A thickness of the first magnetic element  402  may be greater than or equal to the thickness of the second magnetic element  408 . In some embodiments, the second magnetically conductive element  406  may include a groove-type structure. In some embodiments, the groove-shaped structure may include a U-shaped cross-section, and the groove-shaped second magnetically conductive element  406  may include a bottom plate and a side wall. In some embodiments, the bottom plate and the side wall may be integrally formed. For example, the side wall may be formed by extending the bottom plate in a direction perpendicular to the bottom plate. In some embodiments, the bottom plate may be connected to the side wall via one or more connection manners described according to some embodiments of the present disclosure. A shape of the second magnetic element  408  may include a ring, a sheet, etc. More descriptions regarding the shape of the second magnetic element  408  may be found elsewhere in the present disclosure. In some embodiments, the second magnetic element  408  may be coaxial with the first magnetic element  402  and/or the first magnetically conductive element  404 . 
     Further, an upper surface of the first magnetic element  402  may be connected to a lower surface of the first magnetically conductive element  404 . A lower surface of the first magnetic element  402  may be connected to the bottom plate of the second magnetically conductive element  406 . A bottom surface of the second magnetic element  408  may be connected to the side wall of the second magnetically conductive element  406 . The connection between the first magnetic element  402 , the first magnetically conductive element  404 , the second magnetically conductive element  406 , and/or the second magnetic element  408  may include a bonding connection, a clamping connection, a welding connection, a riveting connection, a bolting connection, or the like, or any combination thereof. 
     In some embodiments, a magnetic gap may be formed between side walls of the first magnetic element  402  and/or the first magnetically conductive element  404  and/or the second magnetic element  408  and the second magnetically conductive element  406 . The voice coil may be disposed in the magnetic gap. In some embodiments, the first magnetic element  402 , the first magnetically conductive element  404 , the second magnetically conductive element  406 , and the second magnetic element  408  may form a magnetic circuit. In some embodiments, the magnetic circuit assembly  4100  may generate a first full magnetic field, and the first magnetic element  402  may generate a second magnetic field. The first full magnetic field may be formed by magnetic fields generated by one or more components (e.g., the first magnetic element  402 , the first magnetically conductive element  404 , the second magnetically conductive element  406 , and/or the second magnetic element  408 ) of the magnetic circuit assembly  4100 . In some embodiments, a magnetic field intensity (also referred to as a magnetic induction or a magnetic flux density) of the first full magnetic field in the magnetic gap may be greater than a magnetic field intensity of the second magnetic field in the magnetic gap. In some embodiments, the second magnetic element  408  may generate a third magnetic field, which may improve the magnetic field intensity of the first full magnetic field at the magnetic gap. 
     In some embodiments, an angle between a magnetization direction of the second magnetic element  208  and a magnetization direction of the first magnetic element  402  may be between 90° and 180°. In some embodiments, the angle between the magnetization direction of the second magnetic element  408  and the magnetization direction of the first magnetic element  402  may be between 150° and 180°. In some embodiments, the magnetization direction of the second magnetic element  408  may be opposite to the magnetization direction of the first magnetic element  402  (as indicated by the arrows a and b). 
     Compared with a magnetic circuit assembly of a single magnetic element, the magnetic circuit assembly  4100  may include the second magnetic element  408 . The magnetization direction of the second magnetic element  408  may be opposite to the magnetization direction of the first magnetic element  402 , thereby reducing the magnetic leakage of the first magnetic element  402  in the magnetization direction, suppressing the magnetic field generated by the first magnetic element  402  into the magnetic gap, and increasing the magnetic induction intensity in the magnetic gap. 
     It should be noted that the above descriptions regarding the speaker device are only some specific examples and should not be regarded as the only feasible implementations. Obviously, for those skilled in the art, after understanding the basic principle of the speaker device, it is possible to make various modifications and changes in forms and details to the implementation mode of the speaker device. However, those variations, changes, and modifications do not depart from the scope of the present disclosure. For example, the magnetic elements in the magnetic circuit assembly are not limited to the above-mentioned first magnetic element, second magnetic element, third magnetic element, fourth magnetic element, fifth magnetic element, sixth magnetic element, and seventh magnetic element. A count (or a number) of the magnetic elements may be increased or decreased. Such variations are all within the protection scope of the present disclosure. 
     In some embodiments, the speaker device described above may transmit sound to the user through air conduction. When the sound is transmitted via an air conduction mode, the speaker device may include one or more sound sources. The sound source may be located at a specific position of a user&#39;s head, for example, the top of the head, forehead, cheek, sideburns, auricle, back of the auricle, etc., which may not block or cover the ear canal of the user. For illustration purposes,  FIG.  27    is a schematic diagram illustrating an exemplary sound transmission through air conduction according to some embodiments of the present disclosure. 
     As shown in  FIG.  27   , a sound source  3010  and a sound source  3020  may generate sound waves with opposite phases (“+” and “−” in  FIG.  27    indicate opposite phases). For brevity, the sound source mentioned here refers to the sound outlet on the speaker device that outputs sound. For example, the sound source  3010  and the sound source  3020  may be located at specific positions (e.g., the housing  20  or the supporting connector  10 ) of the speaker device. 
     In some embodiments, the sound source  3010  and the sound source  3020  may be generated by a same vibration device  3001 . The vibration device  3001  may include a diaphragm (not shown in the figure). When the diaphragm is driven by an electrical signal to vibrate, a front of the diaphragm may drive the air to vibrate, and the sound source  3010  may be formed at a sound outlet through a sound guide channel  3012 , and a back of the diaphragm may also drive the air to vibrate, and the sound source  3020  may be formed at another sound outlet through a sound guide channel  3022 . The sound guide channel refers to a sound propagation route from the diaphragm to a corresponding sound outlet. In some embodiments, the sound guide channel is a route enclosed by a specific structure (e.g., the housing  20  or the supporting connector  10 ) on a speaker device. It should be understood that, in some alternative embodiments, the sound source  3010  and the sound source  3020  may be generated by different vibration devices and generated by different diaphragms. 
     A portion of sounds generated by the sound source  3010  and the sound source  3020  may be transmitted to the user&#39;s ears to form a sound heard by the user, and another portion of the sounds may be transmitted to the environment to form a sound leakage. Considering that the sound source  3010  and the sound source  3020  are relatively close to the user&#39;s ears, for the convenience of description, the sound transmitted to the user&#39;s ears may be called a near-field sound, and the leakage sound transmitted to the environment may be called a far-field sound. In some embodiments, the near-field/far-field sound with different frequencies generated by the speaker device may be related to a distance between the sound source  3010  and the sound source  3020 . Generally speaking, the near-field sound produced by the speaker device may be increased with increasement of the distance between the two sound sources, and the far-field sound (sound leakage) produced by the speaker device may be increased with increasement of the frequency. 
     For sounds with different frequencies, the distance between the sound source  3010  and the sound source  3020  may be determined so that a low-frequency near-field sound (e.g., a sound with a frequency less than 800 Hz) generated by the speaker device may be increased, and a high-frequency far-field sound (e.g., a sound with a frequency greater than 2000 Hz) may be reduced. In order to achieve the above purpose, the speaker device may include two or more dual sound source groups, and each dual sound source group may include two sound sources similar to the sound source  3010  and the sound source  3020  and may generate sounds with specific frequencies, respectively. Specifically, a first group of the dual sound source groups may be configured to generate a low frequency sound, and a second group of the dual sound source groups may be configured to generate a high frequency sound. In order to obtain a relatively large low-frequency near-field sound, the distance between the two sound sources in the first group may be set to a relatively large value. Due to that the low-frequency signal has a long wavelength, the relatively large distance between the two sound sources may not form an excessive phase difference in the far field, and may not cause too much sound leakage in the far field. In order to make the high-frequency far-field sound relatively small, the distance between the two sound sources in the second group of the dual sound source groups may be set to a relatively small value. Due to the short wavelength of the high-frequency signal, the relatively small distance between the two sound sources may avoid the formation of a relatively large phase difference in the far field, and avoid the formation of relatively large sound leakage. The distance between the dual sound source of the second group may be smaller than the distance between the dual sound source of the first group. 
     According to the speaker device disclosed in the present disclosure, one or more beneficial effects may be realized. The one or more beneficial effects include: (1) a position of a button on the speaker device may be optimized, and the vibration efficiency of the speaker device may be improved; (2) the sound transmission efficiency of the speaker device may be improved and the volume may be increased; (3) the sound quality of the speaker device may be improved by adjusting an angle θ between a normal line A of a panel or a normal line A&#39; of a contact surface of the panel and the human skin and a straight line B where a driving force of the speaker device locates; (4) the sensitivity of the speaker device may be improved by adding a magnetic element, a magnetically conductive element, and a conductive element in the magnetic circuit assembly. It should be noted that different embodiments may have different beneficial effects. In different embodiments, the beneficial effects may include any of the beneficial effects mentioned above or any other beneficial effects that may be realized. 
     Having thus described the basic concepts, it may be rather apparent to those skilled in the art after reading this detailed disclosure that the foregoing detailed disclosure is intended to be presented by way of example only and is not limiting. Various alterations, improvements, and modifications may occur and are intended to those skilled in the art, though not expressly stated herein. These alterations, improvements, and modifications are intended to be suggested by this disclosure and are within the spirit and scope of the exemplary embodiments of this disclosure. 
     Moreover, certain terminology has been used to describe embodiments of the present disclosure. For example, the terms “one embodiment,” “an embodiment,” and “some embodiments” mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. Therefore, it is emphasized and should be appreciated that two or more references to “an embodiment” or “one embodiment” or “an alternative embodiment” in various portions of this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined as suitable in one or more embodiments of the present disclosure. 
     Further, it will be appreciated by one skilled in the art, aspects of the present disclosure may be illustrated and described herein in any of a number of patentable classes or context including any new and useful process, machine, manufacture, or composition of matter, or any new and useful improvement thereof. Accordingly, aspects of the present disclosure may be implemented entirely hardware, entirely software (including firmware, resident software, micro-code, etc.) or combining software and hardware implementation that may all generally be referred to herein as a “unit,” “module,” or “system.” Furthermore, aspects of the present disclosure may take the form of a computer program product embodied in one or more computer readable media having computer-readable program code embodied thereon. 
     Furthermore, the recited order of processing elements or sequences, or the use of numbers, letters, or other designations therefore, is not intended to limit the claimed processes and methods to any order except as may be specified in the claims. Although the above disclosure discusses through various examples what is currently considered to be a variety of useful embodiments of the disclosure, it is to be understood that such detail is solely for that purpose and that the appended claims are not limited to the disclosed embodiments, but, on the contrary, are intended to cover modifications and equivalent arrangements that are within the spirit and scope of the disclosed embodiments. 
     Similarly, it should be appreciated that in the foregoing description of embodiments of the present disclosure, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the various embodiments. This method of disclosure, however, is not to be interpreted as reflecting an intention that the claimed subject matter requires more features than are expressly recited in each claim. Rather, claim subject matter lies in less than all features of a single foregoing disclosed embodiment. 
     In some embodiments, the numbers expressing quantities or properties used to describe and claim certain embodiments of the application are to be understood as being modified in some instances by the term “about,” “approximate,” or “substantially.” For example, “about,” “approximate,” or “substantially” may indicate a certain variation (e.g., ±1%, ±5%, ±10%, or ±20%) of the value it describes, unless otherwise stated. Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of some embodiments of the application are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable. In some embodiments, a classification condition used in classification is provided for illustration purposes and modified according to different situations. For example, a classification condition that “a probability value is greater than the threshold value” may further include or exclude a condition that “the probability value is equal to the threshold value.”