Earphone

Abstract

The present application relates to an earphone, and particularly relates to the technical field of electronic devices. A first speaker is provided with a first diaphragm; the first speaker matches a driver housing to form a first front cavity and a first rear cavity, which are located on the two sides of the first diaphragm; the driver housing is provided with a first sound output hole configured to be in communication with the first front cavity; the first front cavity has a first resonant frequency; the first rear cavity has a second resonant frequency; a second speaker has a third resonant frequency; and both the difference between the third resonant frequency and the first resonant frequency and the difference between the third resonant frequency and the second resonant frequency are not smaller than 2000 Hz.

Description

A headset

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic devices, in particular to a headset.

BACKGROUND

[0002] Open acoustic output devices are increasingly widely used in people's daily life. However, because of the open feature relative to the ear, the open acoustic output device inevitably radiates leakage sound to the surrounding environment.

[0003] In order to solve the problem of leakage sound of the acoustic output device, for the sound frequency band with relatively small frequency, two sounds with opposite phases can be guided out from the sound guiding hole of the front cavity and the pressure relief hole of the rear cavity of the acoustic output device. Under far field conditions, the sound path difference of the two sounds with opposite phases reaching a certain point in the far field is basically negligible, so the two sounds can cancel each other out, reducing the far field leakage sound. But for the sound frequency band with relatively high frequency, due to the short wavelength of sound wave and the influence of the cavity structure of the acoustic output device, the phase of the sound emitted by the sound guiding hole and the pressure relief hole is no longer opposite, so the far field leakage sound reduction effect is not ideal, and even the two sounds emitted by the sound guiding hole and the pressure relief hole may interfere with each other, enhancing the leakage sound in the far field.

[0004]

SUMMARY

[0005] The present application provides a headset, which comprises a core shell, a first loudspeaker and a second loudspeaker carried by the core shell, the frequency band of the sound output by the first loudspeaker is at least partially lower than the frequency band of the sound output by the second loudspeaker, the headset further comprises a driving circuit for driving the first loudspeaker and the second loudspeaker, the first loudspeaker has a first diaphragm, the first loudspeaker cooperates with the core shell to form a first front cavity and a first rear cavity located on both sides of the first diaphragm, the core shell is provided with a first sound outlet for communicating the first front cavity,

[0006] The first front cavity has a first resonant frequency, the first rear cavity has a second resonant frequency, the second loudspeaker has a third resonant frequency, the difference between the third resonant frequency and the first resonant frequency and the difference between the third resonant frequency and the second resonant frequency are not less than 2000 Hz respectively.

[0007] The earphone provided in the application comprises a core shell, an ear hook, and a first loudspeaker and a second loudspeaker carried by the core shell, the frequency band of the sound output by the first loudspeaker is at least partially lower than the frequency band of the sound output by the second loudspeaker, the core shell is provided with a first sound outlet and a second sound outlet, the first loudspeaker is arranged to output sound through the first sound outlet, the second loudspeaker is arranged to output sound through the second sound outlet, the core shell has a connecting end connected with the ear hook and a free end away from the connecting end,

[0008] The first sound outlet is arranged along the circumference of the second sound outlet and partially located on the side of the second sound outlet close to the free end.

DRAWINGS EXPLANATION

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0010] Fig. 1 is a structural schematic diagram of an earphone in some embodiments of the application;

[0011] Fig. 2 is a structural schematic diagram of the earphone in Fig. 1 from another perspective;

[0012] Fig. 3 is a structural schematic diagram of the earphone in Fig. 1 from still another perspective;

[0013] Fig. 4 is a schematic diagram of the front profile of the ear of a user or a simulator in some embodiments;

[0014] Fig. 5 is a schematic diagram of the earphone in Fig. 1 in a wearing state in some embodiments;

[0015] Fig. 6 is a sectional view of the earphone in Fig. 1 along line VI-VI in some embodiments;

[0016] Fig. 7 is a sectional view of the earphone in Fig. 1 along line VII-VII in some embodiments;

[0017] Fig. 8 is a structural schematic diagram of the first shell in Fig. 6 in some embodiments;

[0018] Fig. 9 is a structural schematic diagram of the first shell in Fig. 8 from another perspective;

[0019] Fig. 10 is a schematic diagram of the arrangement of the first sound outlet and the second sound outlet in some other embodiments;

[0020] Fig. 11 is a schematic diagram of the arrangement of the first sound outlet and the second sound outlet in some other embodiments.

[0021] Fig. 12 is a sectional view of the earphone in Fig. 1 along line VII-VII in some other embodiments;

[0022] Fig. 13 is a structural schematic diagram of the speaker assembly in Fig. 6;

[0023] Fig. 14 is a circuit schematic diagram of the speaker assembly in some embodiments of the present application;

[0024] Fig. 15 is a schematic diagram of the relationship between the volume of the first front cavity and the resonance frequency of the first front cavity in an embodiment of the present application;

[0025] Fig. 16 is a structural schematic diagram of the speaker assembly in Fig. 7 in some other embodiments;

[0026] Fig. 17 is a schematic diagram of the cooperation of the second magnet, the third magnet and the first speaker in some embodiments of the present application;

[0027] Fig. 18 is a schematic diagram of the influence of the ratio of the cross-sectional area of the second magnet perpendicular to the vibration direction of the second diaphragm and the cross-sectional area of the third magnet perpendicular to the vibration direction of the second diaphragm on the magnetic induction intensity at the first coil;

[0028] Fig. 19 is a structural schematic diagram of the second speaker in Fig. 17 in some other embodiments;

[0029] Fig. 20 is a structural schematic diagram of the second speaker in Fig. 13 moving in the long axis direction CZ;

[0030] Fig. 21 is a schematic diagram of the influence of the movement of the second speaker in Fig. 20 in the long axis direction CZ on the magnetic induction intensity at the first coil.

DETAILED DESCRIPTION

[0031] The present application will be further described below in conjunction with the drawings and embodiments. It is particularly pointed out that the following embodiments are only for illustrating the present application, but not for limiting the scope of the present application. Similarly, the following embodiments are only some embodiments of the present application, but not all embodiments of the present application, and all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] The reference to "embodiments" in the present application means that the specific features, structures or characteristics described in conjunction with the embodiments can be included in at least one embodiment of the present application. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0033] The present application describes an earphone. Please refer to FIG. 1, FIG. 2 and FIG. 3, FIG. 1 is a structural schematic diagram of an earphone in some embodiments of the present application, FIG. 2 is a structural schematic diagram of the earphone in FIG. 1 from another perspective, and FIG. 3 is a structural schematic diagram of the earphone in FIG. 1 from yet another perspective. The earphone 100 can include a core module 10 and an ear hook 20 connected with the core module 10. The core module 10 can provide sound to realize auditory experience, and of course can also realize different experiences due to having other functions such as sound pickup function, touch function, pressing function, light function, etc. The core module 10 can be cooperated with the ear hook 20 to realize wearing.

[0034] Please refer to FIG. 4, which is a schematic diagram of the front profile of the ear of a user or a simulator in some embodiments. The ear 200 can include physiological parts such as the external auditory canal 2001, the concha cavity 2002, the cymba concha 2003, the triangular fossa 2004, the antihelix 2005, the scapha 2006, the helix 2007 and the antitragus 2008. Among them, the external auditory canal 2001 has a certain depth and can extend to the eardrum, but for the convenience of description, the external auditory canal 2001 can refer to the ear hole of the ear 200 without special explanation. In addition, the concha cavity 2002, the cymba concha 2003, the triangular fossa 2004 and other physiological parts can also have a certain volume and depth. The concha cavity 2002 can be directly communicated with the external auditory canal 2001, that is, the ear hole can be regarded as located at the bottom of the concha cavity 2002.

[0035] It can be understood that for users, there can be individual differences between different users, which in turn leads to different size differences in the shape and size of the ear 200. In order to facilitate description and reduce (or even eliminate) individual differences of different users, a simulator containing a head and its ear (generally having a left ear and a right ear, and here taking one of the ears as an example) 200 can be made based on standards such as ANSI S3.36, S3.25 and IEC: 60318-7, for example, GRAS 45BC KEMAR, HEAD Acoustics, B&K 4128 series or B&K 5128 series, etc., to present the scenario of most users wearing the earphone 100 through the simulator. Taking GRAS KEMAR as an example, the simulator of the ear 200 can be any one of GRAS 45AC, GRAS 45BC, GRAS 45CC or GRAS 43AG, etc. Taking HEAD Acoustics as an example, the simulator of the ear 200 can be any one of HMS II.3, HMS II.3LN or HMS II.3LN HEC, etc.

[0036] It should be noted that in the field of medicine, anatomy, etc., the sagittal plane, the coronal plane and the horizontal plane of the human body or the human body simulator can be defined as three basic planes, and the sagittal axis, the coronal axis and the vertical axis can be defined as three basic axes. Among them, the sagittal plane refers to a plane perpendicular to the ground made along the front-back direction of the body, which divides the human body or the human body simulator into two parts; the coronal plane refers to a plane perpendicular to the ground made along the left-right direction of the body, which divides the human body or the human body simulator into two parts; the horizontal plane refers to a plane parallel to the ground made along the up-down direction of the body, which divides the human body or the human body simulator into two parts. Correspondingly, the sagittal axis refers to an axis perpendicular to the coronal plane along the front-back direction of the body, the coronal axis refers to an axis perpendicular to the sagittal plane along the left-right direction of the body, and the vertical axis refers to an axis perpendicular to the horizontal plane along the up-down direction of the body. Further, the "front side of the ear" in the present application is a concept relative to the "rear side of the ear", the former refers to the side of the ear away from the head, and the latter refers to the side of the ear towards the head, both of which are for the ear 200 of the user or the simulator. Wherein, observing the ear 200 of the human body or the human body simulator along the direction of the coronal axis, as shown in FIG. 4.

[0037] Referring to FIG. 5, FIG. 5 is a schematic diagram of the earphone 100 in some embodiments in a wearing state. The core module 10 is located at the front side of the ear 200 in the wearing state. At least part of the ear hook 20 is located at the rear side of the ear 200 in the wearing state, so that the earphone 100 is hung on the ear 200 in the wearing state.

[0038] In the present application, when describing the process or action of wearing the earphone 100, such as "wearing the earphone 100", "the earphone 100 is in a wearing state" and "in a wearing state", it can mean that the earphone 100 is worn on the ear 200. Of course, because different users have individual differences, the earphone 100 worn by different users may have some differences from the earphone 100 worn on the ear 200 of the simulator, but such differences should be tolerated.

[0039] The core module 10 can be arranged to not block the external auditory canal 2001 in the wearing state, so that the earphone 100 is an "open earphone". It can be understood that the earphone 100 can be in different wearing states, so that the core module 10 may partially block the external auditory canal 2001, but the external auditory canal 2001 is still not blocked.

[0040] Referring to FIG. 1, FIG. 2 and FIG. 3, the core module 10 can have a connecting end CE connected with the ear hook 20 and a free end FE not connected with the ear hook 20. In the wearing state, the free end FE of the core module 10 can extend into the concha cavity 2002, or can only cover at least part of the concha cavity 2002. The core module 10 and the ear hook 20 can be arranged to jointly hold the ear 200 from the front and back of the ear region 200 corresponding to the concha cavity 2002, thereby increasing the resistance of the earphone 100 from falling off the ear 200, and further improving the stability of the earphone 100 in the wearing state.

[0041] The core module 10 can have a thickness direction X, and a length direction Y and a width direction Z perpendicular to the thickness direction X and orthogonal to each other. Among them, the length direction Y can be defined as the direction with the maximum extension size in the two-dimensional orthographic projection shape of the core module 10 on the plane (two-dimensional projection plane) where the outer surface of the core module 10 is located or on the sagittal plane (two-dimensional projection plane) (for example, when the two-dimensional orthographic projection shape is a rectangle or an approximate rectangle, the length direction Z is the length direction of the rectangle or the approximate rectangle), the width direction Z can be defined as the direction perpendicular to the length direction Y in the two-dimensional orthographic projection (for example, when the two-dimensional orthographic projection shape is a rectangle or an approximate rectangle, the width direction Z is the width direction of the rectangle or the approximate rectangle), and the thickness direction X can be defined as the direction perpendicular to the two-dimensional projection plane carrying the two-dimensional orthographic projection.

[0042] In some embodiments, in the wearing state, when the core module 10 is in an inclined state, the length direction Y and the width direction Z are still parallel or approximately parallel to the sagittal plane, the length direction Y can have a non-0° angle with the sagittal axis, that is, the length direction Y can also be correspondingly arranged to be inclined, and the width direction Z can have a non-0° angle with the vertical axis, that is, the width direction Z is also arranged to be inclined.

[0043] In some embodiments, the length direction Y can be defined as the direction of the core module 10 approaching or moving away from the back of the head in the wearing state, that is, the length direction Y can be parallel to the sagittal axis or have a non-0° angle. The width direction Z can be defined as the direction of the core module 10 approaching or moving away from the top of the head in the wearing state, that is, the width direction Z can be parallel to the vertical axis or have a non-0° angle. In some embodiments, the free end FE is pressed in the concha cavity 2002 in the thickness direction X. For example, the free end FE abuts in the concha cavity 2002 in the length direction Y and / or the width direction Z. In some embodiments, the direction from the connecting end CE to the free end FE can be the length direction Y, of course, it can also be different from the length direction Y due to the need of structure.

[0044] It can be understood that in some embodiments, the length direction Y can also be defined as the direction from the connecting end of the movement module 10 to the free end of the movement module 10, the thickness direction X can be defined as the direction of the movement module 10 towards or away from the user's ear in the wearing state, and the width direction Z is perpendicular to the thickness direction X and orthogonal to the length direction Y.

[0045] It should be noted that in the wearing state, the free end FE of the movement module 10 can be orthogonally projected on the antihelix 2005, and can also be orthogonally projected on the left and right sides of the head and on the front side of the ear 200 on the sagittal axis.

[0046] Of course, in other scenarios, at least part of the movement module 10 can also be orthogonally projected on the antihelix 2005, and can also be orthogonally projected on the left and right sides of the head and on the front side of the ear 200 on the sagittal axis.

[0047] In other words, the ear hook 20 can support the movement module 10 to be worn to the wearing position of the concha cavity 2002, the antihelix 2005, the front side of the ear 200, etc.

[0048] Please refer to FIG. 1, FIG. 2 and FIG. 5, in the wearing state, and along the direction of the coronal axis, the movement module 10 can be set to a circular shape, an elliptical shape, a rounded square shape, a rounded rectangular shape, etc. Therefore, in order to facilitate description, the present embodiment takes the movement module 10 set to a rounded rectangular shape as an example for exemplary description. In some embodiments, the length of the movement module 10 in the length direction Y can be greater than the width of the movement module 10 in the width direction Z.

[0049] The core module 10 can have an inner side IS facing the ear 200 along the thickness direction X in the wearing state, an outer side OS facing away from the ear 200, and a connecting surface (e.g., a lower side LS, an upper side US, and an outer end surface RS, etc.) connecting the inner side IS and the outer side OS. Among them, in the wearing state of the core module 10, the upper side US connects the inner side IS and the outer side OS, the lower side LS connects the inner side IS and the outer side OS, the upper side US is closer to the user's head top along the width direction Z, the lower side LS is farther away from the user's head top along the width direction Z, and the outer end surface RS connects the upper side US and the lower side LS, and can also connect the inner side IS and the outer side OS. The thickness direction X can also be defined as the direction of the core module 10 approaching or moving away from the ear 200 in the wearing state. At least part of the connecting surface, for example, the outer end surface RS, is located in the concha cavity 2002 in the wearing state, and forms a first contact area with the front side of the ear 200 area. That is, the outer end surface RS can be located at one end of the length direction Y towards the back of the head in the wearing state, and at least partially located in the concha cavity 2002. In some embodiments, the ear hook 20 forms a second contact area with the back side of the ear 200 area in the wearing state. The second contact area and the first contact area at least partially overlap in the ear thickness direction of the ear 200 area. Further, the core module 10 and the ear hook 20 can jointly hold the ear 200 from the front and back of the ear 200, and the holding force formed is mainly in the form of compressive stress, which is beneficial to improve the stability and comfort of the earphone 100 in the wearing state. In some embodiments, when the core module 10 is arranged in a circular, elliptical or other shape, the connecting surface can also refer to the arc side of the core module 10.

[0050] It should be noted that the terms "first", "second", "third", etc. in the present application are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined by the terms "first", "second", "third", etc. can be explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0051] It can be understood that the core module 10 can also be worn directly or through other means, and can even be connected and cooperated with other structures in cooperation with the ear hook 20 to achieve wearing. Further, the function of the core module 10 can not be limited to the embodiments listed in the present application. In some embodiments, the ear hook 20 can be omitted or replaced by other structures.

[0052] In addition, when the wearing mode of the core module 10 changes, the cooperation mode of the core module 10 with the ear part 200 can also change, but in some embodiments, the internal structure and overall structure, external structure, etc. of the core module 10 do not necessarily change. Even in some embodiments, words related to the orientation, such as the lower side LS, the upper side US, and the outer end face RS, do not necessarily form a corresponding relationship with the ear part 200. Of course, in some embodiments, the connection end CE and the like are only words related to the orientation, and do not necessarily mean that they include a certain function.

[0053] Furthermore, when the wearing mode of the core module 10 changes, the core module 10 can be worn by cooperating with the ear hook 20 or other structures at the connection end CE.

[0054] Referring to FIGS. 6 and 7, FIG. 6 is a cross-sectional view of the earphone 100 along line VI-VI in FIG. 1 in some embodiments, and FIG. 7 is a cross-sectional view of the earphone 100 along line VII-VII in FIG. 1 in some embodiments. The core module 10 can include a core shell 11, a speaker assembly 12, and a master control circuit board 13. The core shell 11 can be connected with the ear hook 20. The core shell 11 can have a mounting space 101 for mounting the speaker assembly 12 and the master control circuit board 13, and of course can also be used to mount other electronic elements, which will not be described in detail. The speaker assembly 12 and the master control circuit board 13 can be arranged in the core shell 11, such as the mounting space 101. The master control circuit board 13 can be electrically connected with the speaker assembly 12 for controlling the speaker assembly 12 to work. It can be understood that the core shell 11 serves as the external shell of the core module 10, and the aforementioned inner side IS, outer side OS, and connecting surface (such as the lower side LS, the upper side US, and the rear side RS) connecting the inner side IS and the outer side OS of the core module 10 are formed on the core shell 11 as the external surface of the core shell 11.

[0055] The core shell 11 can include a first shell 111 and a second shell 112 that are buckled to each other along the thickness direction X to form the mounting space 101. The first shell 111 is closer to the ear part 200 than the second shell 112 in the wearing state. The first shell 111 and the second shell 112 have a parting surface 102 therebetween to simplify the structure of the core shell 11 and reduce the processing cost. Of course, the core shell 11 can also have other structural forms, and is not limited to the embodiments listed in the present application.

[0056] In some embodiments, the first sound outlet hole 1101 and the second sound outlet hole 1102 can be arranged on the core shell 11 and communicate with the mounting space 101. The first sound outlet hole 1101 and the second sound outlet hole 1102 can be matched with the speaker assembly 12 respectively, so that the sound waves generated by the speaker assembly 12 can be propagated through the first sound outlet hole 1101 and the second sound outlet hole 1102 respectively. The first sound outlet hole 1101 and the second sound outlet hole 1102 can not be communicated, and the arrangement of two sound outlet holes can improve the auditory experience of the speaker assembly 12 and avoid interference between multiple speakers.

[0057] Please refer to FIG. 8, which is a structural schematic diagram of the first shell 111 in some embodiments of FIG. 6. In some embodiments, the first sound outlet hole 1101 and / or the second sound outlet hole 1102 can be arranged on the first shell 111. For example, the first sound outlet hole 1101 and the second sound outlet hole 1102 can be arranged on the bottom wall 1111 of the first shell 111. In some embodiments, the bottom wall 1111 can correspond to the inner side IS of the core module 10. When the core module 10 is worn into the concha cavity 2002, the inner side IS of the bottom wall 1111 of the core shell 11 can have a certain distance from the concha cavity 2002 due to the certain volume and depth of the concha cavity 2002. In addition, the core shell 11 can form an auxiliary cavity in communication with the external auditory canal 2001 in the wearing state, and the first sound outlet hole 1101 and the second sound outlet hole 1102 can be at least partially opposite to and in communication with the auxiliary cavity. In addition, in the wearing state, the sound waves generated by the speaker assembly 12 and propagated through the first sound outlet hole 1101 and the second sound outlet hole 1102 can be limited by the auxiliary cavity, that is, the auxiliary cavity can converge the sound waves, so that the sound waves can be more propagated into the external auditory canal 2001, thereby improving the volume and quality of the sound heard by the user in the near field, which is conducive to improving the acoustic effect of the earphone 100.

[0058] In some embodiments, the first sound outlet hole 1101 and the second sound outlet hole 1102 are closer to the free end FE than to the connecting end CE, so that the first sound outlet hole 1101 and the second sound outlet hole 1102 are closer to the external auditory canal 2001 in the wearing state. In some embodiments, the core module 10 can be arranged to not block the external auditory canal 2001 in the wearing state, and the auxiliary cavity can be arranged in a semi-open manner.

[0059] Referring to Figures 7 and 8, the first housing 111 can be a plastic part, or a structure composed of or composite of multiple materials, or of course, a housing structure made of other materials. The first housing 111 may include a first sidewall 1112 extending from the edge of the bottom wall 1111 towards the side near the second housing 112. In some embodiments, a pressure relief hole 1104 and / or a tuning hole 1105 may be provided on the first sidewall 1112, that is, a pressure relief hole 1104 and / or a tuning hole 1105 may be provided on the upper side US or lower side LS corresponding to the movement housing 11. Further, a sound-absorbing mesh and / or a protective steel mesh may be provided at the pressure relief hole 1104 and / or the tuning hole 1105.

[0060] Understandably, the positions of acoustic holes such as the pressure relief hole 1104 and the tuning hole 1105 can be adjusted on the movement housing 11, such as the first housing 111, according to the needs of those skilled in the art. For example, the pressure relief hole 1104 and the tuning hole 1105 can be respectively located on opposite sides of the first sidewall 1112 along the width direction Z.

[0061] Furthermore, since the first sound outlet 1101, the pressure relief hole 1104, and the tuning hole 1105 can all be located on the first housing 111, the structure of the first housing 111 is simplified, which helps to reduce processing costs. In addition, since the pressure relief hole 1104 and the tuning hole 1105 are respectively located on opposite sides of the first sidewall 1112 along the width direction Z, the parting surface 102 can be approximately symmetrically arranged about a reference plane perpendicular to the width direction Z, which helps to improve the appearance quality of the movement module 10.

[0062] Furthermore, the acoustic apertures are not limited to the pressure relief aperture 1104 and the tuning aperture 1105, but may also include other acoustic apertures that mate with the speaker assembly 12. In some embodiments, at least one of the pressure relief aperture 1104 and the tuning aperture 1105 may be omitted.

[0063] Please refer to Figure 9, which is a structural schematic diagram of the first housing 111 in Figure 8 from another perspective. The first sound outlet 1101 and the second sound outlet 1102 are arranged adjacent to each other. The reasonable layout of the sound outlet positions ensures that the volume of the sound output from the first sound outlet 1101 and the second sound outlet 1102 is balanced when the device is worn, thereby improving the user's listening experience. In some embodiments, the first sound outlet 1101 can be arranged around the second sound outlet 1102 in a circumferential manner to further enhance the acoustic magnetism of the speaker assembly 12. Of course, compared to a linear arrangement of the first sound outlet 1101, the circumferential arrangement of the first sound outlet 1101 is more conducive to having sufficient opening area of ​​the sound outlet within the limited space on the first housing 111, thereby ensuring consistent listening for different people.

[0064] In some embodiments, the inner side IS (e.g., the bottom wall 1111 corresponding to the inner side IS) of the core housing 11 can be provided with a protruding portion 1113 protruding in the thickness direction X. The second sound outlet hole 1102 can be provided on the protruding portion 1113, and part of the speaker assembly 12 can be accommodated inside the protruding portion 1113, so that in the wearing state, the part of the speaker assembly 12 accommodated in the protruding portion 1113 can be closer to the ear canal of the user, the sound waves generated by the speaker assembly 12 and propagated out through the second sound outlet hole 1102 have a shorter sound path to the external ear canal 2001, reducing the loss of sound waves and increasing the sound pressure level in the external ear canal 2001. Of course, in some embodiments, the first sound outlet hole 1101 can also be provided on the protruding portion 1113, and the first sound outlet hole 1101 can be closer to or directly opposite the concha cavity 2002 through the protruding portion 1113, so that the sound output by the first sound outlet hole 1101 is reflected and enhanced by the physiological parts such as the concha cavity 2002. In some embodiments, the first sound outlet hole 1101 can be arranged around the periphery of the protruding portion 1113, so that the structure of the core housing 11 is more compact, and at the same time in the wearing state, the sound paths of the sounds propagated through the first sound outlet hole 1101 and the second sound outlet hole 1102 to the ear canal 2001 of the user are less different, ensuring the consistency of the sound.

[0065] In some embodiments, the protruding portion 1113 protrudes in a direction away from the inner side IS compared to other regions on the inner side IS (e.g., the bottom wall 1111 corresponding to the inner side IS) of the core housing 11. In other embodiments, the protruding portion 1113 can also be provided on the lower side or other connecting surface of the aforementioned core housing 11 to adapt to different wearing scenarios.

[0066] In some embodiments, the cross-sectional area of the protruding portion 1113 perpendicular to the thickness direction X can gradually decrease in a direction away from the core housing 11.

[0067] Referring to FIG. 9, the first sound outlet hole 1101 can include a first hole section 1114 and a second hole section 1115. In some embodiments, the first hole section 1114 and the second hole section 1115 can be disposed on the inner side IS. Referring to FIG. 9, the first hole section 1114 is located on one side of the second sound outlet hole 1102 close to the lower side LS, and the second hole section 1115 is located on one side of the second sound outlet hole 1102 close to the outer end face RS. In this way, in the wearing state (for example, the free end FE of the core module 10 extends into the concha cavity 2002), the first sound outlet hole 1101 is closer to the user's external auditory canal 2001, so that the sound output by the core module 10 can be more transmitted into the user's external auditory canal 2001, ensuring the listening volume. For another example, the first hole section 1114 is located on one side of the second sound outlet hole 1102 close to the lower side LS, and the second hole section 1115 is located on one side of the second sound outlet hole 1102 away from the outer end face RS. In this way, the opening of the second hole section 1115 can avoid affecting the user's wearing experience.

[0068] In some embodiments, the first hole section 1114 can also be disposed at the corner where the inner side IS connects the lower side LS, and the second hole section 1115 can be disposed at the corner where the inner side IS connects the outer end face RS. In the wearing state (for example, the core module 10 partially abuts against the antihelix 2005), the first sound outlet hole 1101 can be directed to the user's external auditory canal 2001, improving the directivity of the sound and improving the listening volume. In other embodiments, the first hole section 1114 can be disposed on the inner side IS, and the second hole section can be disposed at the corner where the inner side IS connects the outer end face RS. In some embodiments, the first hole section 1114 can be disposed on the connecting surface between the inner side IS and the lower side LS (for example, at the corner where the inner side IS connects the lower side LS). In some embodiments, the second hole section 1115 can be disposed on the connecting surface between the inner side IS and the outer end face RS (for example, at the corner where the inner side IS connects the outer end face RS).

[0069] In some embodiments, the first hole section 1114 extends along the length direction Y from the connection with the second hole section 1115 and has a width of 1mm-2.5mm in the width direction Z, and the second hole section 1115 extends along the width direction Z from the connection with the first hole section 1114 and has a width of 1mm-2.5mm in the length direction Y. In some embodiments, the first hole section 1114 extends along the length direction Y from the connection with the second hole section 1115 and has a width gradually decreasing in the width direction Z, and the second hole section 1115 extends along the width direction Z from the connection with the first hole section 1114 and has a width gradually increasing in the length direction Y. In this way, the first hole section 1114 closer to the lower side LS or the upper side US can be prevented from interfering with other acoustic holes provided in the lower side LS or the upper side US, the air permeability of the first sound outlet hole 1101 can be ensured, and the user's listening experience can be prevented from being affected.

[0070] In some embodiments, the pressure relief hole 1104 can be provided on the upper side US, and can also be provided on the lower side LS. In addition, when the pressure relief hole 1104 cooperates with the first sound outlet hole 1101, the mutual influence between the pressure relief hole 1104 and the first sound outlet hole 1101, such as the first hole section 1114 and the second hole section 1115, can be reduced.

[0071] In some embodiments, the first sound outlet hole 1101 can further include a third hole section 1116. Please refer to FIG. 10 and FIG. 11, FIG. 10 is a schematic view of the arrangement of the first sound outlet hole 1101 and the second sound outlet hole 1102 in another embodiment, and FIG. 11 is a schematic view of the arrangement of the first sound outlet hole 1101 and the second sound outlet hole 1102 in another embodiment. The third hole section 1116 can be connected to the end of the second hole section 1115 away from the first hole section 1114 and located on the side of the second sound outlet hole 1102 away from the first hole section 1114. In some embodiments, the third hole section 1116 can be provided on the inner side IS and located on the side of the second sound outlet hole 1102 close to the upper side US, and the first hole section 1114 is located on the side of the second sound outlet hole 1102 close to the lower side LS, that is, the third hole section 1116 and the second hole section 1115 are in communication, and the first hole section 1114 is located on the opposite sides of the second sound outlet hole 1102, so that the second hole section 1115 connects the first hole section 1114 and the third hole section 1116 to become one. In some embodiments, the third hole section 1116 can be provided at the corner where the inner side IS connects the upper side US. In some embodiments, the third hole section 1116 can be provided on the connecting surface between the inner side IS and the upper side US (for example, the corner where the inner side IS connects the upper side US).

[0072] In some embodiments, the third hole segment 1116 is arranged such that the first sound hole 1101 is symmetrical along the length direction Y and has a plane of symmetry PS arranged along the length direction Y, so that the first sound hole 1101 has a "U-shaped" structure with the opening facing away from the outer end surface RS.

[0073] In other embodiments, the third hole segment 1116 is arranged on the side of the second sound hole 1102 facing away from the outer end surface RS, and the third hole segment 1116 and the first hole segment 1114 are connected away from the one end of the second hole segment 1115, in which case the first sound hole 1101 has a "U-shaped" structure with the opening facing the upper side surface US. In other embodiments, the first hole segment 1114 is arranged on the side of the second sound hole 1102 close to the upper side surface US, the third hole segment 1116 is arranged on the side of the second sound hole 1102 facing away from the outer end surface RS, and the third hole segment 1116 and the first hole segment 1114 are connected away from the one end of the second hole segment 1115, in which case the first sound hole 1101 has a "U-shaped" structure with the opening facing the lower side surface LS.

[0074] Referring to FIGS. 9, 10 and 11, along the length direction Y, the distance between the reference point a, which is the farthest from the free end FE along the upper side of the first sound hole 1101, and the outer end surface RS is not less than 9 mm. It should be understood that when the outer end surface RS is a circular arc surface, the tangent plane at the reference point on the outer end surface RS along the length direction Y and farthest from the connecting end CE is perpendicular to the length direction Y, and along the length direction Y, the distance between the reference point a and the tangent plane is not less than 9 mm. In some embodiments, along the length direction Y, the distance between the reference point a, which is the farthest from the free end FE along the upper side of the first sound hole 1101, and the outer end surface RS is within 10-20 mm. Such an arrangement can optimize the layout of the first sound hole 1101 on the movement core shell 11 and ensure the air permeability of the first sound hole 1101.

[0075] In some embodiments, along the width direction Z, the distance between the reference point b, which is the closest to the upper side surface US along the upper side of the first sound hole 1101, and the upper side surface US is not less than 1.5 mm. It should be understood that when the upper side surface US is a circular arc surface, the tangent plane at the reference point on the upper side surface US along the width direction Z and farthest from the connecting lower side surface LS is perpendicular to the width direction Z, and along the width direction Z, the distance between the reference point b and the tangent plane is not less than 1.5 mm. In some embodiments, along the width direction Z, the distance between the reference point b, which is the closest to the upper side surface US along the upper side of the first sound hole 1101, and the upper side surface US is within 2-8 mm. Such an arrangement can optimize the layout of the first sound hole 1101 on the movement core shell 11 and avoid interference between the sound waves emitted by the first sound hole 1101 and the sound waves emitted by other acoustic holes opened on the upper side surface US, thereby ensuring the listening experience of the user.

[0076] Referring to FIG. 10 and FIG. 11, the first sound outlet hole 1101 and the second sound outlet hole 1102 can be approximately arranged on a plane perpendicular to the thickness direction X. In some embodiments, on the plane perpendicular to the thickness direction X, the shortest distance L between the projected hole of the first sound outlet hole 1101 and the projected hole of the second sound outlet hole 1102 can constrain the relative position relationship of the first sound outlet hole 1101 and the second sound outlet hole 1102. In some embodiments, the shortest distance L between the projected hole of the first sound outlet hole 1101 and the projected hole of the second sound outlet hole 1102 is not less than 2 mm, thereby avoiding the sound waves respectively propagated out of the first sound outlet hole 1101 and the second sound outlet hole 1102 from generating sound wave interference and affecting the user's listening. In some embodiments, the shortest distance L between the projected hole of the first sound outlet hole 1101 and the projected hole of the second sound outlet hole 1102 is within the range of 2 mm-5 mm, thereby avoiding sound wave interference while ensuring that the first sound outlet hole 1101 has sufficient air permeation area.

[0077] Referring to FIG. 12, FIG. 12 is a cross-sectional view of the earphone 100 along line VII-VII in some other embodiments. The second sound outlet hole 1102 can have a central axis AE, and the direction of the central axis AE away from the side of the earphone core housing 11 can be the positive direction. In some embodiments, the extension direction of the second sound outlet hole 1102 can be the central axis AE. In some embodiments, the line connecting the centroid of the opening surface of the second sound outlet hole 1102 on the inner side IS and the centroid of the opening surface on the inner surface of the mounting space 101 of the earphone core housing 11 can also be referred to as the central axis AE. In some embodiments, the central axis AE of the second sound outlet hole 1102 can be perpendicular to the side (for example, the inner side IS) of the earphone core housing 11 where the second sound outlet hole is located. In some embodiments, the positive direction of the central axis AE of the second sound outlet hole 1102 is arranged to form an angle of less than 90° with the side (for example, the inner side IS) of the earphone core housing 11 where the second sound outlet hole is located, so as to allow the second sound outlet hole 1102 to be more biased towards the external auditory canal 2001 and improve the user's listening effect. For example, when the second sound outlet hole is arranged on the inner side IS of the earphone core housing 11, the positive direction of the central axis AE of the second sound outlet hole 1102 can be arranged to be inclined upward to the upper side US, downward to the lower side LS, or outward to the outer end surface RS. In some embodiments, the angle between the positive direction of the central axis AE of the second sound outlet hole 1102 and the positive direction of the width direction Z is between 75°-80°, and the positive direction of the width direction Z can be the direction along the width direction Z from the upper side US to the lower side LS.

[0078] In some embodiments, referring to FIG. 9, FIG. 10 and FIG. 11, the first sound hole 1101 has a length in the length direction Y in a range of 6mm-8mm, and a width in the width direction Z in a range of 5mm-7mm. In this way, the first sound hole 1101 has sufficient air permeation area, and the resonance frequency of the speaker cavity coupled with the first sound hole 1101 is in a desired range.

[0079] Referring to FIG. 6, FIG. 7 and FIG. 8, the inner wall of the core shell 11 is recessed to form a recessed area 1103 for cooperating with the speaker assembly 12, so as to improve the space utilization of the core shell 11, for example, the installation space 101, and facilitate the positioning of the speaker assembly 12. In some embodiments, the recessed area 1103 can be arranged around the second sound hole 1102, so that the space in the recessed area 1103 is in communication with the second sound hole 1102. In some embodiments, the recessed area 1103 can be arranged corresponding to the protruding part 1113, that is, the protruding part 1113 is provided with the recessed area 1103 towards the inside of the core shell 11, for example, the installation space 101. At this time, the speaker assembly 12 can be at least partially arranged in the recessed area 1103.

[0080] Referring to FIG. 6, the second shell 112 can be made of plastic, or can be made of a structure composed or combined of multiple materials, and of course can be made of other materials. The parting surface 102 between the second shell 112 and the first shell 111, for example, the first side wall 1112, extends or bends towards the side of the first shell 111 in the direction close to the free end FE. The second shell 112 can include a top wall 1121 arranged opposite to the first shell 111, for example, the bottom wall 1111, and a second side wall 1122 connected with the top wall 1121 and buckled with the first shell 111, for example, the first side wall 1112.

[0081] It can be understood that, due to the arrangement form of the second side wall 1122, the free end FE is arranged in a tapered manner away from the connecting end CE, which facilitates the cooperation with the contour of the user's ear and improves the wearing experience.

[0082] Referring to FIGS. 6, 7, and 13, which is a structural diagram of the speaker assembly 12 in FIG. 6. The speaker assembly 12 can convert received electrical signals into sound signals (sound waves) and propagate out through the first sound hole 1101 and / or the second sound hole 1102 to facilitate transmission into the external ear canal 2001. The speaker assembly 12 can be coupled with the master control circuit board 13 to allow operation under the control of the master control circuit board 13. The speaker assembly 12 can include a first speaker 121 and a second speaker 122 disposed in the core housing 11, such as the mounting space 101. The first speaker 121 and the second speaker 122 can be respectively coupled with the master control circuit board 13 to allow operation under the control of the master control circuit board 13. The sound waves generated by the first speaker 121 can propagate out through the first sound hole 1101. The sound waves generated by the second speaker 122 can propagate out through the second sound hole 1102. In some embodiments, the sound waves generated by the first speaker 121 and the sound waves generated by the second speaker 122 can also propagate out through other acoustic holes (such as the pressure relief hole 1104 and the tuning hole 1105) disposed on the core housing 11.

[0083] In some embodiments, the sound waves generated by the first speaker 121 can propagate out through the first sound hole 1101 (such as the first hole segment 1114, the second hole segment 1115), and the sound waves generated by the second speaker 122 can propagate out through the second sound hole 1102. Of course, the sound waves generated by the first speaker 121 can also propagate out through the third hole segment 1116.

[0084] The frequency range of the sound output by the first speaker 121 is at least partially lower than the frequency range of the sound output by the second speaker 122. In some embodiments, the frequency range of the sound output by the first speaker 121 can be entirely less than the frequency range of the sound output by the second speaker 122. In other embodiments, the frequency range of the sound output by the first speaker 121 partially overlaps with the frequency range of the sound output by the second speaker 122, and the maximum frequency of the sound output by the first speaker is lower than the maximum frequency of the sound output by the second speaker, so that the frequency band of the sound output by the second speaker 122 can be partially greater than the frequency band of the sound output by the first speaker 121.

[0085] In some embodiments, the frequency range of the sound output by the first speaker 121 can include 20Hz-5kHz, and the frequency range of the sound output by the second speaker 122 can include 5kHz-20kHz. In some embodiments, the frequency range of the sound output by the first speaker 121 and the frequency range of the sound output by the second speaker 122 can have different standards based on actual conditions, such as the range of the sound output by the first speaker 121 can also be a frequency range not higher than 1kHz, such as 1Hz-1kHz, 100Hz-800Hz, etc.

[0086] In some embodiments, the frequency range of the sound output by the first speaker 121 can be referred to as a low frequency band or a mid-low frequency band, and the frequency range of the sound output by the second speaker 122 can be referred to as a high frequency band or a mid-high frequency band. In turn, the first speaker 121 can be referred to as a low frequency speaker, and the second speaker 122 can be referred to as a high frequency speaker. The low frequency band can be at least part of a frequency band of substantially 20 Hz to 500 Hz, or at least part of a frequency band of substantially 20 Hz to 3 KHz, and the high frequency band can be at least part of a frequency band of substantially 5 KHz to 20 KHz, or at least part of a frequency band of 6 kHz to 16 kHz. The mid frequency band can be between the low frequency band and the high frequency band, and can also partially overlap with the low frequency and / or high frequency part. In turn, the mid-low frequency band can be the set of the low frequency band and the mid frequency band, and the mid-high frequency band can be the set of the mid frequency band and the high frequency band.

[0087] It can be understood that the above-mentioned division of frequency bands is only given as an example and the intervals are approximate. The definition of the above-mentioned frequency bands can change with different industries, different application scenarios and different classification standards. For example, in some other application scenarios, the low frequency refers to a frequency band of substantially 20 Hz to 80 Hz, the mid-low frequency can refer to a frequency band of substantially 80 Hz-160 Hz, the mid frequency can refer to a frequency band of substantially 160 Hz to 1280 Hz, the mid-high frequency can refer to a frequency band of substantially 1280 Hz-2560 Hz, and the high frequency can refer to a frequency band of substantially 2560 Hz to 120 KHz.

[0088] Referring to FIGS. 6 and 7, the first speaker 121 can be fixed in the movement core housing 11, and the axial direction of the first speaker 121 can be arranged along the thickness direction X. In some embodiments, the first speaker 121 can be fixed on the first housing 111, such as the bottom wall 1111, and of course can also be fixed on the first side wall 1112 or other parts of the movement core housing 11. In some embodiments, the axial direction of the first speaker 121 can be the vibration direction of the first diaphragm 1211.

[0089] In some embodiments, the first speaker 121 is in a strip structure, matching the movement core housing 11, such as the mounting space 101, i.e. the first speaker 121 can be arranged to extend in the direction from the connecting end CE to the free end FE, so as to facilitate arranging a first speaker 121 large enough in the movement core housing 11, such as the mounting space 101, thereby enhancing the sound volume generated by the earphone 100, i.e. optimizing the arrangement and improving the space utilization.

[0090] Please refer to Figure 7. The first loudspeaker 121 may include a first diaphragm 1211 for vibrating to produce sound, and may also include a first magnetic circuit system 1212 for driving the first diaphragm 1211 to vibrate and produce sound, as well as a support member for supporting the first diaphragm 1211 and the first magnetic circuit system 1212. To the extent understood by those skilled in the art, the technical principle of the first magnetic circuit system 1212 driving the first diaphragm 1211 to vibrate and produce sound through the cooperation of a first coil and a magnet will not be described in detail.

[0091] The first loudspeaker 121 is located within the housing 11 (e.g., within the mounting space 101) and cooperates with the housing 11. A first front cavity 1201 is formed on the front side of the first diaphragm 1211 of the first loudspeaker 121, and a first rear cavity 1202 is formed on the rear side of the first diaphragm 1211. The front side of the first diaphragm 1211 refers to the side of the first diaphragm 1211 facing away from the first magnetic circuit system 1212, and the rear side of the first diaphragm 1211 refers to the side of the first diaphragm 1211 facing the first magnetic circuit system 1212. In some embodiments, the first front cavity 1201 is located on the side of the first loudspeaker 121 facing the inner surface IS of the housing 11, for example, the side facing the bottom wall 1111 of the first housing 111, and the first rear cavity 1202 is located on the side of the first loudspeaker 121 facing away from the inner surface IS, for example, the side facing away from the bottom wall 1111 of the first housing 111. In some embodiments, the first front cavity 1201 may be connected to the first sound outlet 1101, so that the sound waves generated by the first speaker 121 in cooperation with the first front cavity 1201 can propagate through the first sound outlet 1101. The first rear cavity 1202 may be coupled to other acoustic holes (such as pressure relief hole 1104 and tuning hole 1105) provided on the housing 11, so that the sound waves generated by the first speaker 121 in cooperation with the first rear cavity 1202 can propagate through the other acoustic holes.

[0092] The second speaker 122 is disposed within the housing 11 (see Figures 6 and 7). The second speaker 122 can be fixed to the first housing 111, for example, the bottom wall 1111, in which case the axial direction of the second speaker 122 can be along the thickness direction X. In some embodiments, the second speaker 122 can be located within the first front cavity 1201 of the first speaker 121, in which case the axial direction of the first speaker 121 and the axial direction of the second speaker 122 are parallel. In other embodiments, the second speaker 122 can also be fixed to the first side wall 1112 or other parts of the housing 11, or it can be located outside the first front cavity 1201 based on installation requirements; in this case, the axial direction of the second speaker 122 can also intersect the thickness direction X.

[0093] In some embodiments, the second speaker 122 can be embedded in the inner wall of the mechanism housing 11. For example, a groove can be formed on the inner wall of the mechanism housing 11 to accommodate the second speaker 122, thereby achieving the embedded setting of the second speaker 122. Referring to FIG7, the groove for accommodating the second speaker 122 (e.g., recessed area 1103) can be formed on the bottom wall 1111 of the first housing 111. In this case, when worn, the second speaker 122 is located on the inner wall of the inner side surface IS of the aforementioned mechanism module 10, and the second speaker 122 is closer to the user's ear. For another example, the groove for accommodating the second speaker 122 can be provided on the lower side surface or the inner wall of each connecting surface of the aforementioned mechanism module 10 to adapt to different wearing scenarios and bring a better listening experience to the user.

[0094] Please refer to Figure 14, which is a circuit diagram of the speaker assembly 12 in some embodiments of this application. The speaker assembly 12 may have a first terminal 1301 and a second terminal 1302 that are electrically connected to the main control circuit board 13, respectively. The first speaker 121 may be connected in series between the first terminal 1301 and the second terminal 1302, and thus can emit sound under the control of the main control circuit board 13. The second speaker 122 may be connected in series between the first terminal 1301 and the second terminal 1302, and thus can emit sound under the control of the main control circuit board 13.

[0095] As described above, the first front cavity 1201 and the first rear cavity 1202 of the first speaker 121 are coupled to the first sound outlet 1101 and other acoustic holes (such as the pressure relief hole 1104) on the housing 11, respectively. Since the first front cavity 1201 and the first rear cavity 1202 are located on both sides of the first diaphragm 1211, the sound waves output by them are naturally out of phase. Therefore, the sound waves output by the first front cavity 1201 and the first rear cavity 1202 can cancel each other out of phase in the far field, thereby reducing the sound leakage of the headphone 100. However, when the frequency of the output sound is high, the wavelength of the high-frequency sound is shorter. Under far-field conditions, the first front cavity 1201 and the first rear cavity 1202 are equivalent to two sound sources, making the distance between the two sound sources non-negligible compared to the wavelength, resulting in the sound signals emitted by the two sound sources not being able to cancel each other out. In addition, when the acoustic transmission structure of the earphone 100 resonates, the phase of the sound signal actually radiated by the first front cavity 1201 and the first rear cavity 1202 has a certain phase difference with the original phase of the sound wave generation position, and adds an extra resonance peak in the transmitted sound wave, resulting in a chaotic sound field distribution and difficulty in ensuring the sound leakage reduction effect in the far field at high frequencies, and may even increase sound leakage.

[0096] Therefore, it is necessary to process the higher-frequency sound output by the first speaker 121 to avoid significant far-field sound leakage in the higher frequency range. Accordingly, some embodiments of this application can make the first speaker 121 output only the lower-frequency sound. In the lower frequency range, the phase of the sound waves generated by the first speaker 121 is basically unaffected by the cavity structure (e.g., the first front cavity 1201 and / or the first rear cavity 1202), and they can cancel each other out in the far field, reducing far-field sound leakage. At the same time, the second speaker 122 can be made to output only the higher-frequency sound. Utilizing the strong directivity of the higher-frequency sound, the higher-frequency sound can be mainly radiated in the direction of the external auditory canal 2001, thereby reducing sound leakage. This ensures that the headphone 100 achieves a sound leakage reduction effect across the entire frequency range.

[0097] In some embodiments, the first front cavity 1201 may have a first resonant frequency, and the first rear cavity 1202 may have a second resonant frequency.

[0098] For illustrative purposes only, the test method for the first resonant frequency can be as follows: a test instrument, such as a microphone, is brought close to and directly facing the earphone 100 (e.g., directly facing the first sound outlet 1101 coupled to the first front cavity 1201) according to measurement methods and standards known to those skilled in the art. The earphone 100 is excited by a signal generator, such as the main control circuit board 13, to complete the test. The frequency response curve related to the first front cavity 1201 can be obtained by testing, and the first resonant frequency can be further obtained by analyzing the frequency response curve.

[0099] Alternatively, the test method for the second resonant frequency can be as follows: a test instrument, such as a microphone, is brought close to and directly facing the earphone 100 according to measurement methods and standards known to those skilled in the art (e.g., directly facing the acoustic hole, such as the pressure relief hole 1104, coupled to the first rear cavity 1202), and the earphone 100 is excited by a signal generator, such as the main control circuit board 13, to complete the test. The frequency response curve related to the first rear cavity 1202 can be obtained, and the second resonant frequency can be further obtained by analysis from the frequency response curve.

[0100] Understandably, the distance between the test instrument, such as the microphone, and the earphone 100 (e.g., the acoustic port, such as the first sound outlet port 1101, the pressure relief port 1104) should be determined in accordance with the measurement methods and standards known to those skilled in the art. Of course, this distance can also be limited to less than a preset distance threshold (e.g., 5 cm).

[0101] The first front cavity 1201 and the first sound outlet 1101 can be approximated as a Helmholtz resonant cavity model, with the first front cavity 1201 being the body of the Helmholtz resonant cavity model and the first sound outlet 1101 being the neck of the Helmholtz resonant cavity model. In this case, the resonant frequency of the Helmholtz resonant cavity model is the first resonant frequency of the first front cavity 1201. In the Helmholtz resonant cavity model, the volume of the first front cavity 1201 can affect its first resonant frequency f, as follows:

[0102] In equation (1), c is the speed of sound in air, S is the sound output area (also called cross-sectional area) of the neck (e.g., the first sound outlet 1101), V is the volume of the cavity (e.g., the first front cavity 1201), and L is the depth of the neck (e.g., the first sound outlet 1101).

[0103] As shown in equation (1), the first resonant frequency f can be adjusted by changing the sound output area S of the first sound outlet 1101 or the volume V of the first front cavity 1201. For example, when the volume of the first front cavity 1201 increases, the first resonant frequency f shifts to a lower frequency, while other conditions remain unchanged. Similarly, the first rear cavity 1202 and its coupled acoustic aperture can be approximated as a Helmholtz resonant cavity model, and the second resonant frequency can be adjusted. Further details are omitted here.

[0104] In some embodiments, the second resonant frequency may be lower than the first resonant frequency, and the difference between the first and second resonant frequencies may not exceed 1000Hz. This configuration allows the sound transmitted from the first front cavity 1201 and the first rear cavity 1202 to cancel each other out better in the far field, reducing sound leakage from the headphones and enhancing the user's privacy experience. For example, the range of the first resonant frequency is 4.5kHz-5.5kHz, and the range of the second resonant frequency is 4kHz-5kHz.

[0105] In some embodiments, the first resonant peak of the first front cavity 1201 can be adjusted by changing its volume. In other words, the first resonant peak of the first front cavity 1201 can be shifted to a lower frequency band by increasing its volume. This is because the sound pressure level of the cavity decreases rapidly in the frequency band after the resonant frequency. Therefore, the first resonant frequency of the first front cavity 1201 shifts to a lower frequency band, thereby attenuating the high-frequency sound waves generated by the first speaker 121. This allows the first speaker 121 to output only lower frequency sounds, while the higher frequency sound waves are played by the second speaker 122 as much as possible. With this configuration, ideal sound leakage reduction can be achieved in the headphones across the entire frequency range.

[0106] In some embodiments, the volume of the first front cavity 1201 can be adjusted to 270 mm. 3-400mm 3 Within the specified range. By limiting the volume of the first front cavity 1201, the first resonant frequency of the first front cavity 1201 is shifted to a lower frequency band, thereby attenuating the high-frequency sound waves generated by the first speaker 121. In other words, low-pass filtering is achieved by adjusting the volume of the first front cavity 1201. In some embodiments, the volume of the first front cavity 1201 can be 290 mm². 3 -350mm 3 In some embodiments, the volume of the first front cavity 1201 may be 300 mm. 3 Or 310mm 3 Understandably, the design of the volume of the first front cavity 1201 is intended to attenuate the high-frequency sound waves generated by the first speaker 121. Furthermore, the volume of the first front cavity 1201 can be adjusted according to the needs of those skilled in the art.

[0107] Please refer to Figure 15, which is a schematic diagram showing the relationship between the volume of the first front cavity 1201 and the resonant frequency of the first front cavity 1201 in one embodiment of this application. The volume V1 is 270 mm². 3 The volume V2 is 310 mm² 3 The volume V3 is 350mm² 3 V1, V2, and V3 each correspond to a cavity frequency response curve. The volume of the first front cavity 1201 is 270 mm². 3 Increased to 350mm 3 During this process, it can be seen from the curves corresponding to volume V1, volume V2, and volume V3 that the first resonant frequency of the first front cavity 1201 decreases from 5.1kHz to 4.8kHz. This shows that as the volume of the first front cavity 1201 increases, its first resonant frequency shifts to lower frequencies.

[0108] It is understandable that in order to achieve the first resonant frequency of the first front cavity 1201 to move to a lower frequency band, it is not limited to limiting the volume of the first front cavity 1201. The first resonant frequency can also be moved to a lower frequency band by designing the position and shape of the first sound outlet 1101 as shown in Figures 9, 10 and 11 in the above embodiments.

[0109] In some embodiments, the second speaker 122 may have a third resonant frequency. In some embodiments, the third resonant frequency of the second speaker 122 may be no less than 5.5 kHz. Furthermore, when cooperating with the first speaker 121, the high-frequency sound waves generated by the first speaker 121 can be attenuated, and then effectively supplemented by the second speaker 122, without affecting the overall sound quality of the headphones 100. In some embodiments, the third resonant frequency of the second speaker 122 may be no less than 6 kHz. In some embodiments, the third resonant frequency of the second speaker 122 may be between 6 kHz and 10 kHz.

[0110] In some embodiments, the difference between the third resonant frequency and the first resonant frequency, and the difference between the third resonant frequency and the second resonant frequency, are each not less than 2000Hz. Therefore, when used in conjunction with the first speaker 121, the high-frequency sound waves generated by the first speaker 121 can be attenuated, and then effectively supplemented by the second speaker 122, without affecting the overall sound quality of the headphones 100. In some embodiments, the difference between the third resonant frequency and the first resonant frequency, and the difference between the third resonant frequency and the second resonant frequency, are each not less than 2500Hz.

[0111] Please refer to Figures 7 and 16. Figure 16 is a structural schematic diagram of the speaker assembly 12 in Figure 7 in some other embodiments. The second speaker 122 may include a second diaphragm 1221 for vibrating to produce sound, a second magnetic circuit system 1222 for driving the second diaphragm 1221 to produce sound, and a speaker housing for supporting and mounting the second diaphragm 1221 and the magnetic circuit system 1222. The technical principle of the second magnetic circuit system 1222 driving the second diaphragm 1221 to vibrate and produce sound through the cooperation of a second coil and a magnet will not be elaborated further within the scope of understanding of those skilled in the art. The speaker housing is a housing structure distinct from the core housing 11, allowing for flexible mounting of the second speaker 122 on the core module 10. A portion of the speaker housing may be integrally formed with the core housing 11, while another portion includes a support frame to support the second speaker 122, making the structure of the core module 10 simpler.

[0112] The second speaker 122 is located within the housing 11 (e.g., mounting space 101) and mates with the housing 11. The front side of the second diaphragm 1221 of the second speaker 122 mates with the speaker housing to form a second front cavity 1203, and the rear side of the second diaphragm 1221 mates with the speaker housing to form a second rear cavity 1204. The front side of the second diaphragm 1221 refers to the side of the second diaphragm 1221 facing away from the second magnetic circuit system 1222, and the rear side of the second diaphragm 1221 refers to the side of the second diaphragm 1221 facing the second magnetic circuit system 1222. When the second speaker is located on the inner wall of the inner side IS of the housing module 10, the second front cavity 1203 is located on the side of the second speaker 122 facing the inner side IS, and the second rear cavity 1204 is located on the side of the second speaker 122 facing away from the inner side IS.

[0113] The second front cavity 1203 can communicate with the second sound outlet 1102, allowing sound waves generated by the second speaker 122 to propagate through the second sound outlet 1102. In some embodiments, the first front cavity 1201 and the second front cavity 1203 can communicate, thereby allowing both the first sound outlet 1101 and the second sound outlet 1102 to communicate with the first front cavity 1201 / second front cavity 1203. In other embodiments, the housing 11 may also include a structure such as an isolation plate disposed between the second speaker 122 and the first speaker 121 to isolate the cavity coupled to the first speaker 121 and the cavity coupled to the second speaker 122, such that the first sound outlet 1101 communicates only with the first front cavity 1201, and the second sound outlet 1102 communicates only with the second front cavity 1203.

[0114] In some embodiments, the second speaker 122 may be mounted inside the housing 11 closer to the free end FE. That is, the length of the second speaker 122 in the direction from the connecting end CE to the free end FE is smaller than the length of the first speaker 121 in the same direction. This arrangement allows the second speaker 122 to be closer to the free end FE when worn (e.g., with the free end FE inserted into the concha 2002), so that the sound output from the second sound outlet 1102 can be better transmitted to the user's ear canal, increasing the listening volume.

[0115] In some embodiments, the second magnetic circuit system 1222 and the first magnetic circuit system 1212 are mutually exclusive to enhance the magnetic induction intensity at the first coil in the first speaker 121. This mutual exclusion can be understood as the second magnetic circuit system 1222 having a north pole (N) relative to the first magnetic circuit system 1212, and the first magnetic circuit system 1212 having a north pole (N) relative to the second magnetic circuit system 1222. This results in the second magnetic circuit system 1222 exerting a force on the first magnetic circuit system 1212 that causes the first magnetic circuit system 1212 to move away from the second magnetic circuit system 1222, and the first magnetic circuit system 1212 exerting a force on the second magnetic circuit system 1222 that causes the second magnetic circuit system 1222 to move away from the first magnetic circuit system 1212. Alternatively, the second magnetic circuit system 1222 having a south pole (S) relative to the first magnetic circuit system 1212, and the first magnetic circuit system 1212 having a south pole (S) relative to the second magnetic circuit system 1222. It is understandable that the second magnetic circuit system 1222 and the first magnetic circuit system 1212 are configured to be mutually exclusive, which can also increase the magnetic induction intensity at the second coil, which will not be elaborated here.

[0116] Furthermore, due to the increased magnetic induction intensity at the first coil / second coil, the driving force for the first coil to drive the first diaphragm 1211 and the second coil to drive the second diaphragm 1221 to vibrate is enhanced, thereby increasing the sound pressure level of the sound waves output by both the first speaker 121 and the second speaker 122. In some embodiments, the mutual repulsion between the second magnetic circuit system 1222 and the first magnetic circuit system 1212 can be set such that the sound pressure level of the second speaker 122 is increased by at least 1 dB compared to when the second speaker 122 operates alone (e.g., omitting the first speaker 121 in the above embodiments). In some embodiments, the mutual repulsion between the second magnetic circuit system 1222 and the first magnetic circuit system 1212 can be set such that the sound pressure level of the second speaker 122 is increased by at least 2 dB compared to when the second speaker 122 operates alone.

[0117] Similarly, in some embodiments, the mutual repulsion between the second magnetic circuit system 1222 and the first magnetic circuit system 1212 can be set such that the sound pressure level of the first speaker 121 is increased by at least 1 dB compared to when the first speaker 121 operates alone (e.g., omitting the second speaker 122 in the above embodiments). In some embodiments, the mutual repulsion between the second magnetic circuit system 1222 and the first magnetic circuit system 1212 can be set such that the sound pressure level of the first speaker 121 is increased by 2 dB compared to when the first speaker 121 exists alone.

[0118] The mutually exclusive cooperation between the second magnetic circuit system 1222 and the first magnetic circuit system 1212 can increase the sound pressure level of the first speaker 121 and / or the second speaker 122. Furthermore, by maintaining the sound pressure level of the headphone 100's output sound through this mutual exclusive cooperation, the relative distance between the second speaker 122 and the first speaker 121 can be brought closer, resulting in a smaller and lighter headphone 100 and improved user comfort. In some embodiments, the distance between the second speaker 122 and the first speaker 121 can be reduced to 2mm.

[0119] In some embodiments, the projection of the second magnetic circuit system 1222 along the vibration direction of the second diaphragm 1221 may at least partially overlap with the first magnetic circuit system 1212 to ensure the mutual repulsion between the second magnetic circuit system 1222 and the first magnetic circuit system 1212, thereby enhancing the magnetic induction intensity at the first coil / second coil. In some embodiments, the projection of the first magnetic circuit system 1212 along the vibration direction of the first diaphragm 1211 may at least partially overlap with the second magnetic circuit system 1222 to ensure the mutual repulsion between the second magnetic circuit system 1222 and the first magnetic circuit system 1212, thereby enhancing the magnetic induction intensity at the first coil and / or the second coil. It is understood that the magnetic induction intensity at the first coil refers to the average magnetic induction intensity of the entire first coil. In some other scenarios, the magnetic induction intensity at the first coil may also refer to the magnetic induction intensity at a specific endpoint or several specific endpoints of the first coil. The same applies to the magnetic induction intensity at the second coil, which will not be elaborated further here.

[0120] In some embodiments, referring to FIG16, the first magnetic circuit system 1212 may include a first magnet 1213 for driving a first diaphragm 1211 and a magnetically conductive cover 1214 surrounding the first magnet 1213. The side of the first diaphragm 1211 facing the first magnetic circuit system 1212 is acoustically coupled to other acoustic holes (e.g., pressure relief hole 1104) on the housing 11 to form a first rear cavity 1202, and the side of the first diaphragm 1211 facing away from the first magnetic circuit system 1212 is acoustically coupled to a first sound outlet 1101 to form a first front cavity 1201. The second magnetic circuit system 1222 may include a second magnet 1223 for driving a second diaphragm 1221 to produce sound. The side of the second diaphragm 1221 facing the second magnetic circuit system 1222 is defined as a second rear cavity 1204, and the side of the second diaphragm 1221 facing away from the second magnetic circuit system 1222 is acoustically coupled to a second sound outlet 1102 to form a second front cavity 1203.

[0121] The aforementioned first magnetic circuit system 1212 and second magnetic circuit system 1222 are mutually exclusive, which can refer to the mutually exclusive arrangement of the magnetic poles of the second magnet 1223 and the first magnet 1213. In some embodiments, referring to FIG16, the magnetic pole of the second magnet 1223 facing the first magnet 1213 is the N pole, and the magnetic pole of the first magnet 1213 facing the second magnet 1223 is also the N pole. In this case, the magnetic poles of the first magnet 1213 and the second magnet 1223 are mutually exclusive. Similarly, the magnetic pole of the second magnet 1223 facing the first magnet 1213 is the S pole, and the magnetic pole of the first magnet 1213 facing the second magnet 1223 is also the S pole. In this case, the magnetic poles of the first magnet 1213 and the second magnet 1223 are also mutually exclusive.

[0122] In some embodiments, in a first reference plane perpendicular to the vibration direction of the second diaphragm 1221, the second magnet 1223 and the first magnet 1213 at least partially overlap. The degree of mutual repulsion can be adjusted by adjusting the overlapping portion of the second magnet 1223 and the first magnet 1213, thereby adjusting the sound pressure level and / or volume of the headphone 100.

[0123] In some embodiments, the second magnetic circuit system 1222 may include a third magnet 1224 that cooperates with the second magnet 1223 to drive the second diaphragm 1221 to produce sound. The second magnet 1223 and the third magnet 1224 cooperate to drive the second diaphragm 1221 to produce sound, thereby enhancing the acoustic performance of the second loudspeaker 122.

[0124] The third magnet 1224 may be disposed around the second magnet 1223 and located on the same side of the second diaphragm 1221 as the second magnet 1223. In some embodiments, along the vibration direction of the second diaphragm 1221, the magnetic poles of the third magnet 1224 facing the second diaphragm 1221 are opposite to the magnetic poles of the second magnet 1223 facing the second diaphragm 1221; that is, the magnetic poles of the second magnet 1223 and the third magnet 1224 are opposite to each other along the vibration direction of the second diaphragm 1221. For example, the magnetic pole of the third magnet 1224 facing the second diaphragm 1221 is the N pole, and the magnetic pole of the third magnet 1224 facing away from the second diaphragm 1221 is the S pole; the magnetic pole of the second magnet 1223 facing the second diaphragm 1221 is the S pole, and the magnetic pole of the second magnet 1223 facing away from the second diaphragm 1221 is the N pole. For example, the magnetic pole of the third magnet 1224 facing the second diaphragm 1221 is the S pole, and the magnetic pole of the third magnet 1224 facing away from the second diaphragm 1221 is the N pole. The magnetic pole of the second magnet 1223 facing the second diaphragm 1221 is the N pole, and the magnetic pole of the second magnet 1223 facing away from the second diaphragm 1221 is the S pole.

[0125] Please refer to Figures 17 and 18. Figure 17 is a schematic diagram of the second magnet 1223, the third magnet 1224, and the first speaker 121 in some embodiments of this application. Figure 18 is a schematic diagram of the influence of the ratio of the cross-sectional area of ​​the second magnet 1223 perpendicular to the vibration direction of the second diaphragm 1221 to the cross-sectional area of ​​the third magnet 1224 perpendicular to the vibration direction of the second diaphragm 1221 on the magnetic induction intensity at the first coil.

[0126] In Figure 17(a), the cross-sectional area of ​​the second magnet 1223 perpendicular to the vibration direction of the second diaphragm 1221 is smaller than that of the third magnet 1224 in the same direction, approximately 10% of the cross-sectional area of ​​the third magnet 1224. In Figure 17(b), the cross-sectional area of ​​the second magnet 1223 perpendicular to the vibration direction of the second diaphragm 1221 is larger than that of the third magnet 1224 in the same direction, approximately four times the cross-sectional area of ​​the third magnet 1224. In Figure 18, the ratio of the cross-sectional areas of the second magnet 1223 and the third magnet 1224 in the same direction is used as the horizontal axis, and the magnetic induction intensity at the first coil is used as the vertical axis. Within a first reference plane perpendicular to the vibration direction of the second diaphragm 1221, it can be seen that as the ratio of the cross-sectional area of ​​the second magnet 1223 to the cross-sectional area of ​​the third magnet 1224 gradually increases from 0.1 to 4, the magnetic induction intensity at the first coil also increases. Therefore, it can be concluded that as the ratio of the cross-sectional area of ​​the second magnet 1223 to the cross-sectional area of ​​the third magnet 1224 increases, the combined magnetic field of the second speaker 122 (e.g., the magnetic field obtained after coupling the magnetic field generated by the second magnet 1223 and the magnetic field generated by the third magnet 1224) continuously enhances the magnetic induction intensity at the first coil, thereby improving the sensitivity of the first speaker 121.

[0127] In some embodiments, to improve the sensitivity of the first speaker 121 while ensuring the acoustic output performance of the second speaker 122, the ratio of the cross-sectional area of ​​the second magnet 1223 perpendicular to the vibration direction of the second diaphragm 1221 to the cross-sectional area of ​​the third magnet 1224 perpendicular to the vibration direction of the second diaphragm 1221 may be between 0.5 and 4. In some embodiments, to improve the sensitivity of the first speaker 121 while ensuring the acoustic output performance of the second speaker 122, the ratio of the cross-sectional area of ​​the second magnet 1223 perpendicular to the vibration direction of the second diaphragm 1221 to the cross-sectional area of ​​the third magnet 1224 perpendicular to the vibration direction of the second diaphragm 1221 may be between 1 and 2.5. In some embodiments, to improve the sensitivity of the first speaker 121 while ensuring the acoustic output performance of the second speaker 122, the ratio of the cross-sectional area of ​​the second magnet 1223 perpendicular to the vibration direction of the second diaphragm 1221 to the cross-sectional area of ​​the third magnet 1224 perpendicular to the vibration direction of the second diaphragm 1221 may be between 2 and 3.

[0128] In some embodiments, within a first reference plane perpendicular to the vibration direction of the second diaphragm 1221, the overlap area between the second magnet 1223 and the first magnetic circuit system 1212 (e.g., the first magnet 1213) is greater than the overlap area between the third magnet 1224 and the first magnetic circuit system 1212 (e.g., the first magnet 1213). This ensures that the area of ​​the second magnet 1223 influencing the first magnetic circuit system 1212 (e.g., the first magnet 1213) enhances the mutual repulsion between the second magnetic circuit system 1222 and the first magnetic circuit system 1212. In some embodiments, within the first reference plane along the vibration direction of the second diaphragm 1221, the overlap area between the second magnet 1223 and the first magnetic circuit system 1212 (e.g., the first magnet 1213) is not less than 90% of the area of ​​the second magnet 1223. In some embodiments, in a first reference plane perpendicular to the vibration direction of the second diaphragm 1221, the overlap area between the second magnet 1223 and the first magnetic circuit system 1212, such as the first magnet 1213, is 100% of the area of ​​the second magnet 1223.

[0129] Please refer to Figure 19, which is a schematic diagram of the structure of the second speaker 122 in Figure 17 in some other embodiments. The second magnetic circuit system 1222 may include a fourth magnet 1225 that cooperates with the second magnet 1223 to drive the second diaphragm 1221 to produce sound. The fourth magnet 1225 can cooperate with the second magnet 1223 to drive the second diaphragm 1221 to produce sound, thereby enhancing the acoustic performance of the second speaker 122. In some embodiments, the fourth magnet 1225 cooperates with the second magnet 1223 and the third magnet 1224 to drive the second diaphragm 1221 to produce sound, thereby enhancing the acoustic performance of the second speaker 122.

[0130] The fourth magnet 1225 can be located on the side of the second diaphragm 1221 opposite to the second magnet 1223, that is, the fourth magnet 1225 and the second magnet 1223 are located on opposite sides of the second diaphragm 1221. In some embodiments, the magnetic pole of the side of the fourth magnet 1225 facing the second diaphragm 1221 is the same as the magnetic pole of the side of the second magnet 1223 facing the second diaphragm 1221. For example, the magnetic pole of the side of the fourth magnet 1225 facing the second diaphragm 1221 is the N pole, and the magnetic pole of the side of the second magnet 1223 facing the second diaphragm 1221 is the N pole. Another example is that the magnetic pole of the side of the fourth magnet 1225 facing the second diaphragm 1221 is the S pole, and the magnetic pole of the side of the second magnet 1223 facing the second diaphragm 1221 is the S pole. This arrangement can further increase the magnetic induction intensity at the second coil of the second speaker 122, thereby enhancing the output sound pressure level of the second speaker 122.

[0131] In some embodiments, the projection of the second speaker 122 along the vibration direction of the second diaphragm 1221 can fall entirely within the first speaker 121. In some embodiments, the projection of the second speaker 122 along the vibration direction of the first diaphragm 1211 can fall entirely within the first speaker 121. This arrangement ensures the mutual repulsion between the first magnetic circuit system 1212 and the second magnetic circuit system 1222, while making the internal space of the headphones more compact and improving space utilization.

[0132] Referring to Figure 13, in a second reference plane perpendicular to the vibration direction of the first diaphragm 1211, the first magnetic circuit system 1212 has a major axis direction CZ and a minor axis direction DZ that are orthogonal to each other. The dimension of the first magnetic circuit system 1212 along the major axis direction CZ is larger than the dimension of the first magnetic circuit system 1212 along the minor axis direction DZ. In some embodiments, the major axis direction CZ may be the length direction Y of the mechanism housing 11, that is, the direction along the interval between the connecting end CE and the free end FE, and the minor axis direction DZ may be the width direction Z of the mechanism housing 11. In other embodiments, the major axis direction CZ may also intersect the length direction Y of the mechanism housing 11, and the minor axis direction DZ may also intersect the width direction Z of the mechanism housing 11.

[0133] In some embodiments, the second speaker 122 may be centrally located relative to the first speaker 121 along the minor axis direction DZ. In the second reference plane, the first speaker 121 has a center O1, and the second speaker 122 has a center O2. It is understood that centralization can be defined as the distance between centers O1 and O2 along the minor axis direction DZ not exceeding 10% of the dimension of the first speaker 121 along the minor axis direction DZ. In some embodiments, the distance between centers O1 and O2 along the minor axis direction DZ is 0.

[0134] Referring to Figure 13, the axial direction of the second speaker 122 can be parallel to the axial direction of the first speaker 121, that is, the angle between the axial direction of the second speaker 122 and the axial direction of the first speaker 121 can be 0°, and the relative postures of the first speaker 121 and the second speaker 122 are consistent. When the second speaker 122 moves relative to the first speaker 121 along the long axis CZ, the overlap area between the second speaker 122 and the first speaker 121 in the axial direction increases from small to large. This gradually strengthens the repulsive force between the second magnetic circuit system 1222 and the first magnetic circuit system 1212, thereby gradually increasing the sound pressure level of the sound radiated by the first speaker 121 and / or the second speaker 122.

[0135] Please refer to Figures 20 and 21. Figure 20 is a structural schematic diagram of the second speaker 122 shown in Figure 13 moving along the major axis CZ. Figure 21 is a schematic diagram of the effect of the second speaker 122 moving along the major axis CZ on the magnetic induction intensity at the first coil. In Figure 21, the horizontal axis represents the distance the second speaker 122 moves along the major axis CZ, and the vertical axis represents the magnetic induction intensity at the first coil. The starting point of the movement of the second speaker 122 is the position where, along the axial direction of the first speaker 121, the projection of the second speaker 122 is closest to the projection of the first speaker 121, and the overlap area is 0, i.e., the position of the second speaker 122 indicated by the dashed line in Figure 20. The ending point can be the position where the center O1 of the first speaker 121 coincides with the center O2 of the second speaker 122, i.e., the position of the left center O1 of the second speaker 122 indicated by the solid line in Figure 20. Referring to Figure 21, it can be seen that when the second speaker 122 moves relative to the first speaker 121 along the long axis CZ, the magnetic induction intensity at the first coil increases with the increase of the moving distance. Therefore, the relative positional relationship between the first speaker 121 and the second speaker 122 along the long axis CZ affects the magnetic induction intensity at the first coil of the first speaker 121. As the center O1 of the first speaker 121 and the center O2 of the second speaker 122 gradually approach each other along the long axis CZ, the overlap area between the second speaker 122 and the first speaker 121 in the axial direction gradually increases. This, in turn, gradually strengthens the repulsive force between the second magnetic circuit system 1222 and the first magnetic circuit system 1212, thereby increasing the sensitivity of the first speaker 121.

[0136] In some embodiments, referring to FIG13, the distance between the center O1 of the first speaker 121 and the center O2 of the second speaker 122 in the long axis direction CZ does not exceed 5 mm. This arrangement ensures that the second speaker 122 enhances the magnetic induction intensity at the first coil of the first speaker 121, thereby increasing the output sound pressure level of the first speaker 121. In some embodiments, the distance between the center O1 of the first speaker 121 and the center O2 of the second speaker 122 in the long axis direction CZ does not exceed 4.5 mm.

[0137] In some embodiments, referring to FIG13, the ratio of the distance between the center O1 of the first speaker 121 and the center O2 of the second speaker 122 along the major axis CZ to the distance of the first speaker 121 along the major axis CZ does not exceed 0.3. In some embodiments, the ratio of the distance between the center O1 of the first speaker 121 and the center O2 of the second speaker 122 along the major axis CZ to the distance of the first speaker 121 along the major axis CZ does not exceed 0.25. This configuration ensures that the second speaker 122 enhances the magnetic induction intensity at the first coil of the first speaker 121, thereby increasing the output sound pressure level of the first speaker 121.

[0138] In some embodiments, the maximum distance from the center O2 of the second speaker 122 to the outer end face RS of the free end FE in the long axis direction CZ does not exceed 10 mm. This configuration allows the second speaker 122 to be closer to the free end FE of the housing 11 when worn (e.g., with the free end FE inserted into the concha 2002), enabling better sound transmission from the second sound outlet 1102 to the user's ear canal and increasing the listening volume. In some embodiments, the maximum distance from the center O2 of the second speaker 122 to the outer end face RS of the free end FE in the long axis direction CZ does not exceed 8 mm. It is understood that when the free end FE is an arc surface, the point on the arc surface furthest from the connecting end CE along the length direction Y of the free end FE is located at a section perpendicular to the length direction Y, and the maximum distance from the center O2 to this section does not exceed 8 mm.

[0139] In some embodiments, along the major axis direction CZ, the first magnetic circuit system 1212 has a first reference point C1 closest to the free end FE. The second magnetic circuit system 1222 has a second reference point C2 closest to the free end FE. The second reference point C2 is located on the side of the first reference point C1 away from the free end FE. In some embodiments, the distance M between the first reference point C1 and the second reference point C2 is greater than or equal to 3 mm to ensure the mutual repulsion between the second magnetic circuit system 1222 and the first magnetic circuit system 1212, thereby improving the output sound pressure level of the first speaker 121 and the second speaker 122. In some embodiments, along the major axis direction CZ, the maximum distance from the center O2 of the second speaker 122 to the point of the first speaker 121 away from the second speaker 122 is less than or equal to 5 mm.

[0140] In some other embodiments described herein, the axial direction of the second speaker 122 can also be adjusted such that the angle between the axial direction of the second speaker 122 and the axial direction of the first speaker 121 is greater than 0° and less than 90°. For example, the angle between the axial direction of the second speaker 122 and the axial direction of the first speaker 121 can also be equal to 90°. It is understood that adjusting the axial direction of the second speaker 122 also adjusts the repulsive force between the second magnetic circuit system 1222 and the first magnetic circuit system 1212.

[0141] Referring to Figures 6 and 7, the main control circuit board 13 can be connected to the second housing 112, for example, fixed to a thermoplastic column connected to the top wall 1121, and can partially overlap with the second side wall 1122 in the thickness direction X. This allows for the placement of a sufficiently large first speaker 121 within the core housing 11, thereby enhancing the sound volume generated by the headphones 100, thus optimizing the layout and improving space utilization. In some embodiments, the main control circuit board 13 may not overlap with the second side wall 1122 in the thickness direction X. In some embodiments, the thickness direction of the main control circuit board 13 can be the thickness direction X, or it can be arranged intersecting with the thickness direction X.

[0142] Since the main control circuit board 13 is located inside the mechanism housing 11, for example, the main control circuit board 13 is connected to the second housing 112, such as the top wall 1121, so that the main control circuit board 13 can be electrically connected to other electronic components or external devices through flexible metal parts such as pogo pins and metal springs.

[0143] In some embodiments, the main control circuit board 13 is located on the side of the first speaker 121 near the second housing 112. In some embodiments, the main control circuit board 13 may be stacked with the first speaker 121 in the thickness direction of the main control circuit board 13 or in the axial direction of the first speaker 121. In some embodiments, along the axial direction of the first speaker 121, the main control circuit board 13 may overlap with a portion of the first speaker 121 near the connection end CE to optimize the arrangement and improve space utilization.

[0144] Referring to Figure 14, the main control circuit board 13 can be electrically connected to terminals such as the first terminal 1301 and the second terminal 1302, and other terminals to control the speaker assembly 12. In some embodiments, terminals such as the first terminal 1301 and the second terminal 1302, and other terminals can be located on the main control circuit board 13.

[0145] The main control circuit board 13 may be provided with a drive circuit 131 to control the speaker components 12, such as the first speaker 121 and the second speaker 122. Furthermore, the drive circuit 131 may mainly consist of a digital-to-analog converter circuit 1311, and may also include a power amplifier circuit, a processor, etc. Specifically, the drive circuit 131 can be formed using at least the digital-to-analog converter circuit 1311 and other circuits according to the prior art, which will not be elaborated further.

[0146] The drive circuit 131 can be electrically connected to terminals such as the first terminal 1301 and the second terminal 1302, and other terminals to achieve electrical connection with the speaker assembly 12, such as the first speaker 121 and the second speaker 122, so as to drive the speaker assembly 12, such as the first speaker 121 and the second speaker 122.

[0147] In some embodiments, the driving circuit 131 can simultaneously drive the first speaker 121 and the second speaker 122 through a digital-to-analog converter circuit 1311, thereby simplifying the circuit setup and reducing costs. That is, the driving circuit 131 can be configured to simultaneously drive the first speaker 121 and the second speaker 122 through the same digital-to-analog converter circuit 1311. Furthermore, when the first speaker 121 and the second speaker 122 cooperate, the high-frequency sound waves generated by the first speaker 121 can be attenuated by the first resonant frequency of the first front cavity 1201, and then effectively supplemented by the second speaker 122 without affecting the overall sound quality.

[0148] Understandably, the earphone 100 may also include electronic components such as batteries, sensors, and antennas to ensure the normal operation of the earphone 100. These electronic components can be set in the mechanism module 10 and / or ear hook 20 as needed, which will not be elaborated here.

[0149] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0150] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0151] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0152] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An earphone, wherein, The earphone includes a housing and a first speaker and a second speaker carried by the housing. The frequency band of the sound output by the first speaker is at least partially lower than the frequency band of the sound output by the second speaker. The first speaker has a first diaphragm. The first speaker cooperates with the housing to form a first front cavity and a first rear cavity located on both sides of the first diaphragm. The housing has a first sound outlet for communicating with the first front cavity. The first front cavity has a first resonant frequency. The first rear cavity has a second resonant frequency. The second speaker has a third resonant frequency. The difference between the third resonant frequency and the first resonant frequency, and the difference between the third resonant frequency and the second resonant frequency, are each not less than 2000Hz.

2. The headphones according to claim 1, wherein, The difference between the third resonant frequency and the first resonant frequency, and the difference between the third resonant frequency and the second resonant frequency, are each not less than 2500Hz.

3. The headphones according to claim 1, wherein, The second resonant frequency is less than the first resonant frequency, and the difference between the first resonant frequency and the second resonant frequency is not greater than 1000Hz.

4. The headphones according to any one of claims 1-3, wherein, The third resonant frequency is not lower than 5.5 kHz, the first resonant frequency is between 4.5 kHz and 5.5 kHz, and the second resonant frequency is between 4 kHz and 5 kHz.

5. The headphones according to any one of claims 1-3, wherein, The headphones further include a driving circuit for driving the first speaker and the second speaker, the driving circuit driving the first diaphragm to vibrate at the third resonant frequency; and / or The driving circuit is configured to drive the first speaker and the second speaker simultaneously through the same digital-to-analog converter circuit.

6. The headphones according to any one of claims 1-5, wherein, The housing of the mechanism is also provided with a second sound outlet, and the second speaker is configured to output sound through the second sound outlet, wherein the first sound outlet is arranged around the second sound outlet in a circumferential manner.

7. The earphone according to claim 6, wherein, The movement housing further has a length direction, a width direction, and a thickness direction that are orthogonal to each other. The thickness direction is defined as the direction in which the movement housing faces or away from the ear when worn. The first sound outlet and the second sound outlet face the ear in the thickness direction. On a plane perpendicular to the thickness direction, the shortest distance between the edge of the orthographic projection of the second sound outlet and the edge of the orthographic projection of the first sound outlet is not less than 2 mm.

8. The headphones according to claim 6, wherein, The earphone also includes an ear hook. The core housing has a connecting end that connects to the ear hook and a free end away from the ear hook. When worn, the core housing is located on the front side of the ear and has an inner side facing the ear. The free end extends into or covers the concha cavity. The second sound outlet is disposed on the inner side. The first sound outlet portion is located on the side of the second sound outlet closer to the free end.

9. The earphone according to claim 7, characterized in that, Both the first and second sound outlets are closer to the free end than to the connecting end.

10. The headphones according to claim 8, wherein, A protrusion is provided on the inner side surface. The protrusion protrudes towards the side away from the interior of the movement housing compared to the peripheral area of ​​the protrusion. A recessed area is provided inside the movement housing corresponding to the protrusion. The second sound outlet is provided on the protrusion and communicates with the space in the recessed area. The second speaker is embedded in the recessed area. The first sound outlet is arranged around the periphery of the protrusion.

11. The headphones according to claim 8, wherein, The movement housing further has orthogonal length, width, and thickness directions, whereby the length direction is defined as the direction from the connecting end to the free end, and the thickness direction is defined as the direction in which the movement housing faces or away from the ear. The movement housing has an upper side facing the user's head along the width direction and a lower side facing away from the head when worn. The upper side and the lower side are respectively connected to the inner side. The housing has an outer end face at the free end that connects the upper side, the lower side and the inner side. The first sound outlet includes a first segment located on the side of the second sound outlet near the lower side and a second segment located on the side of the second sound outlet near the outer end face. The first speaker outputs sound through the first segment and the second segment respectively.

12. The headphones according to claim 11, wherein, The lower side is provided with a pressure relief hole, and the width of the first sound outlet hole is set to increase in the direction from the first hole segment to the second hole segment.

13. The headphones according to claim 11 or 12, wherein, The first hole segment is disposed on the connecting surface between the lower side surface and the inner side surface, and / or the second hole segment is disposed on the connecting surface between the outer end surface and the inner side surface.

14. The headphones according to claim 11, wherein, The first hole segment and the second hole segment are disposed on the inner side surface. The first sound outlet hole also includes a third hole segment located on the side of the second sound outlet hole near the upper side surface. The second hole segment connects the first hole segment and the third hole segment.

15. The headphones according to claim 8, wherein, The second speaker is closer to the free end than to the connected end.

16. The headphones according to claim 11, wherein, The positive direction of the central axis of the second sound outlet is set to be inclined towards the side closer to the lower side, and the positive direction of the central axis of the second sound outlet is the direction along the central axis of the second sound outlet pointing to the outside of the movement housing.

17. The headphones according to claim 11, wherein, The angle between the positive direction of the central axis of the second sound outlet and the positive direction of the width direction is between 75° and 80°, and the positive direction of the width direction is the direction along the width direction from the upper side to the lower side.

18. An earphone, wherein, The earphones include a housing, an ear hook, and a first speaker and a second speaker carried by the housing. The frequency band of the sound output by the first speaker is at least partially lower than the frequency band of the sound output by the second speaker. The housing has a first sound outlet and a second sound outlet. The first speaker is configured to output sound through the first sound outlet, and the second speaker is configured to output sound through the second sound outlet. The housing has a connecting end that connects to the ear hook and a free end away from the connecting end. The first sound outlet is arranged circumferentially around the second sound outlet, and part of it is located on the side of the second sound outlet near the free end.

19. The headphones according to claim 18, wherein, The housing of the mechanism has an inner side facing the ear when worn, and the second sound outlet is disposed on the inner side, wherein the free end at least partially extends into or covers the concha cavity of the ear.

20. The headphones according to claim 18 or 19, wherein, The movement housing further has a length direction, a width direction, and a thickness direction that are orthogonal to each other. The length direction is defined as the direction from the connecting end to the free end. The thickness direction is defined as the direction in which the movement housing faces or moves away from the ear when worn. The first sound outlet and the second sound outlet face the ear in the thickness direction. On a plane perpendicular to the thickness direction, the shortest distance between the edge of the orthographic projection of the second sound outlet and the edge of the orthographic projection of the first sound outlet is not less than 2 mm.

Images