earphones

Abstract

Earphone, wherein the earphone comprises a first loudspeaker and a second loudspeaker, wherein the frequency band of the sound emitted by the first loudspeaker is at least partially lower than the frequency band of the sound emitted by the second loudspeaker, wherein the first loudspeaker comprises a first diaphragm and a first magnetic circuit system for driving the first diaphragm to generate sound, and the second loudspeaker comprises a second diaphragm and a second magnetic circuit system for driving the second diaphragm to generate sound, wherein a projection of the first magnetic circuit system in a direction of vibration of the first diaphragm is arranged to overlap at least partially with the second magnetic circuit system, and wherein the second magnetic circuit system and the first magnetic circuit system are arranged to be mutually exclusive.

Description

TECHNICAL AREA

[0001] The present application relates to the technical field of electronic devices, in particular an earphone. STATE OF THE ART

[0002] With the development of acoustic technologies, earphones have found widespread use in everyday life. Earphones use a combination of multiple speakers to deliver sound, providing the user with a fantastic audio experience. In a combined setup, different speakers could be responsible for outputting sound in different frequency bands. The coupling between these speakers is one of the key factors influencing the overall acoustic output of the earphones. Conversely, poor coupling between the speakers reduces the earphones' acoustic quality. REVELATION OF THE INVENTION

[0003] The present application provides an earphone comprising a first loudspeaker and a second loudspeaker, wherein the frequency band of the sound emitted by the first loudspeaker is at least partially lower than the frequency band of the sound emitted by the second loudspeaker, wherein the first loudspeaker comprises a first diaphragm and a first magnetic circuit system for driving the first diaphragm to generate sound, and the second loudspeaker comprises a second diaphragm and a second magnetic circuit system for driving the second diaphragm to generate sound, wherein a projection of the first magnetic circuit system in a direction of vibration of the first diaphragm is arranged to overlap the second magnetic circuit system at least partially, and wherein the second magnetic circuit system and the first magnetic circuit system are arranged to be mutually exclusive. BRIEF DESCRIPTION OF THE FIGURES

[0004] To clarify the technical solutions in the embodiments of the application, the drawings required for describing these embodiments are briefly presented below. Obviously, the drawings in the following description represent only some embodiments of the application. A person skilled in the art can derive further drawings from these drawings without inventive step. Fig. Figure 1 shows a schematic structural representation of an earphone in some embodiments of the present application; Fig. Figure 2 shows a schematic structural representation of the earphone. Fig. 1. From a different perspective; Fig. Figure 3 shows a schematic structural representation of the earphone. Fig. 1 from yet another perspective; Fig. Figure 4 shows a schematic representation of the front contour of a user's or simulator's ear in some embodiments; Fig. Figure 5 shows a schematic representation of the earphone made of Fig. 1 in some embodiments in a worn state; Fig. Figure 6 shows a cutaway view of the earphone. Fig. 1 in some embodiments along line VI-VI; Fig. Figure 7 shows a cutaway view of the earphone. Fig. 1 in some embodiments along line VII-VII; Fig. Figure 8 shows a schematic structural representation of a first housing made of Fig. 6 in some embodiments; Fig. Figure 9 shows a schematic structural representation of the first housing made of Fig. 8 from a different perspective; Fig. Figure 10 shows a schematic arrangement of a first sound outlet opening and a second sound outlet opening made of Fig. 9 in some other embodiments; Fig. Figure 11 shows a schematic arrangement of the first sound outlet opening and the second sound outlet opening. Fig. 10 in some other embodiments; Fig. 12 shows a cutaway view of the earphone from Fig. 1 in some other embodiments along line VII-VII; Fig. Figure 13 shows a schematic structural representation of a loudspeaker arrangement made of Fig. 6; Fig. Figure 14 shows a schematic circuit diagram of the loudspeaker arrangement in some embodiments of the present application; Fig. Figure 15 shows a schematic representation of the respective dependence of the volume of a first front chamber on the resonance frequency of the first front chamber in an embodiment of the present application; Fig. Figure 16 shows a schematic structural representation of the loudspeaker arrangement. Fig. 7 in some other embodiments; Fig. Figure 17 shows a schematic representation of a second magnet, a third magnet and a first loudspeaker that fit together, in some embodiments of the present application; Fig. Figure 18 shows a schematic representation of the relationship between a cross-sectional area of ​​the second magnet perpendicular to the direction of vibration of a second membrane and a cross-sectional area of ​​the third magnet perpendicular to the direction of vibration of the second membrane. Fig. 17 of the magnetic flux density at a first coil; Fig. Figure 19 shows a schematic structural representation of a second loudspeaker made of Fig. 17 in some other embodiments; Fig. Figure 20 shows a schematic structural representation during the movement of the in Fig. 13 second loudspeaker shown in the direction of a long axis CZ; and Fig. Figure 21 shows a schematic representation of the influence on the magnetic flux density at the first coil during the movement of the second loudspeaker. Fig. 20 in the direction of the long axis CZ. DETAILED EXECUTION FORMS

[0005] The present application is described in more detail below with reference to the accompanying drawings and exemplary embodiments. It should be noted in particular that the following exemplary embodiments are intended only to illustrate the present application and do not, however, limit its scope. Furthermore, the following exemplary embodiments represent only some, not all, of the embodiments of the present application. All other exemplary embodiments that are accessible to a person skilled in the art without inventive step are within the scope of protection of the application.

[0006] The term "embodiment" mentioned in this application should be understood to mean that certain features, structures, or properties described by reference to the embodiment may be included in at least one embodiment of this application. What the person skilled in the art understands explicitly and implicitly is that the embodiments described in this application can be combined with other embodiments.

[0007] The present application will be explained using an earphone. See Fig. 1, Fig. 2 and Fig. 3. Fig. Figure 1 shows a schematic structural representation of an earphone in some embodiments of the present application, Fig. Figure 2 shows a schematic structural representation of the earphone. Fig. 1 from a different perspective, and Fig. Figure 3 shows a schematic structural representation of the earphone. Fig. 1 from yet another perspective. An earphone 100 can comprise a core module 10 and an ear hook 20 connected to the core module 10. The core module 10 can provide sound and thus create an acoustic experience. Of course, it can also create various experiences by incorporating other functions, such as a sound pickup function, a touch function, and a lighting function. The core module 10 can be attached to the ear hook 20 to enable wearing.

[0008] See Fig. 4. Fig. Figure 4 shows a schematic representation of the anterior contour of a user's or simulator's ear in some embodiments. An ear 200 may comprise an external auditory canal 2001, a cavum conchae 2002, a cymba conchae 2003, a fossa triangularis 2004, an antihelix 2005, a scapha 2006, a helix 2007, an antitragus 2008, and other physiological body parts. The external auditory canal 2001 has a certain depth and may extend to the tympanic membrane. However, to simplify the description, the external auditory canal 2001 may refer to the ear opening of the ear 200, unless otherwise specified in the present application. Furthermore, physiological body parts such as the cavum conchae 2002, the cymba conchae 2003, and the fossa triangularis 2004 can also have a certain volume and depth. The cavum conchae 2002 and the external auditory canal 2001 can be in direct communication, i.e.,, it can be viewed as the ear opening being located below the cavum conchae 2002.

[0009] It is understood that different users may have individual variations, which in turn lead to different shapes, sizes, and other dimensional deviations of the earpieces. To simplify the description and reduce (or even eliminate) individual variations between different users, a simulator with the head and its ears (usually a left and a right ear, with one ear being used as an example) can be manufactured based on standards ANS: S3.36, S3.25 and IEC: 60318-7, etc., such as GRAS 45BC KEMAR, HEAD Acoustics, B&K 4128 series or B&K 5128 series, etc., to represent the scenarios most users experience when wearing the earpieces. Using GRAS KEMAR as an example, the ear simulator 200 can be one of the following types: GRAS 45AC, GRAS 45BC, GRAS 45CC or GRAS 43AG etc.Using HEAD Acoustics as an example, the ear simulator 200 can be one of the following types: HMS 11.3, HMS II.3 LN or HMS 11.3LN HEC, etc.

[0010] It should be noted that in medicine and anatomy, three fundamental planes of section can be defined for the human body or a human body simulator: the sagittal plane, the coronal plane, and the horizontal plane. Three fundamental axes can also be defined: the sagittal axis, the coronal axis, and the vertical axis. The sagittal plane is a plane of section perpendicular to the ground in the front-to-back direction of the body, dividing the human body or human body simulator into a left and a right part. The coronal plane is a plane of section perpendicular to the ground in the left-to-right direction of the body, dividing the human body or human body simulator into an anterior and a posterior part.The horizontal plane refers to a cross-sectional plane running parallel to the ground along the top-bottom direction of the body, dividing the human body or the simulator of the human body into an upper and a lower part. Accordingly, the sagittal axis refers to an axis running in the front-back direction of the body and perpendicular to the coronal plane, the coronal axis to an axis running in the left-right direction of the body and perpendicular to the sagittal plane, and the vertical axis to an axis running in the top-bottom direction of the body and perpendicular to the horizontal plane. Furthermore, it is provided that a “front of the ear” described in the present application refers to a term as opposed to a “back of the ear”, the former referring to a side of the ear facing away from the head and the latter to a side of the ear facing the head.Both refer to the user's or the simulator's ear 200. When viewing the ear 200 of the human body or the simulator of the human body in the direction of the coronal axis, this can be seen, as in . Fig. 4 shown, it looks like this.

[0011] See Fig. 5. Fig. Figure 5 shows a schematic representation of the earphone 100. Fig. 1 In some embodiments, in a worn state. The core module 10 is located at the front of the ear 200 in the worn state. The ear hook 20 is located at least partially at the back of the ear 200 in the worn state, so that the earphone 100 is suspended from the ear 200 in the worn state.

[0012] In this application, all descriptions of processes or actions related to wearing the earphone 100, such as "wearing the earphone 100," "in the worn state of the earphone 100," "in the worn state," and the like, may refer to wearing the earphone 100 on the ear 200. Naturally, variations may occur when the earphone 100 is worn by different users compared to the wearing of the earphone 100 on the ear 200 of the simulator. However, these variations should be tolerable.

[0013] The core module 10 can be arranged such that, when worn, it does not block the external auditory canal 2001, thus making the earphone 100 an "open earphone". It is understood that, in various worn configurations, the earphone 100 allows the core module 10 to partially cover the external auditory canal 2001 without completely blocking it.

[0014] See Fig. 1, Fig. 2 and Fig. 3. The core module 10 can have a connecting end CE attached to the ear hook 20 and a free end FE not attached to the ear hook 20. When worn, the free end FE of the core module 10 can either protrude into the concha 2002 or at least partially cover the concha 2002. The core module 10 and the ear hook 20 can be arranged to jointly clamp the ear 200 from the front and back of a region of the ear 200 corresponding to the concha 200, thereby increasing the resistance to the earphone 100 falling out of the ear 200 and thus improving the stability of the earphone 100 when worn.

[0015] The core module 10 can have a thickness direction X, a length direction Y, and a width direction Z, all of which are perpendicular to the thickness direction X and orthogonal to each other. The length direction Y can be defined as the direction in which the core module 10 has its maximum extent in a plane (a two-dimensional projection surface) of the outer surface of the core module 10, or in the form of a two-dimensional orthogonal projection onto the sagittal plane (the two-dimensional projection surface). For example, if the two-dimensional orthogonal projection takes a rectangular or approximately rectangular shape, the length direction Z is the length direction of the rectangular or approximately rectangular shape. The width direction Z can be defined as a direction perpendicular to the length direction Y in a two-dimensional orthogonal projection.For example, if the two-dimensional orthogonal projection takes on a rectangular or approximately rectangular shape, the width direction Z is the width direction of the rectangular or approximately rectangular shape. The thickness direction X can be defined as a direction perpendicular to a two-dimensional projection surface carrying a two-dimensional orthogonal projection.

[0016] When the core module 10 is in an inclined position in the supported state, some embodiments provide that the longitudinal direction Y and the lateral direction Z still run parallel or approximately parallel to the sagittal plane, whereby the longitudinal direction Y may have an angle other than 0° to the sagittal axis, i.e., the longitudinal direction Y may also be inclined accordingly. The lateral direction Z may have an angle other than 0° to the vertical axis, i.e., the lateral direction Z is also inclined.

[0017] In some embodiments, the longitudinal direction Y can be defined as the direction in which the core module 10, when worn, is located near or farther from the back of the head; that is, the longitudinal direction Y can be parallel to the sagittal axis or at an angle other than 0° to it. The lateral direction Z can be defined as the direction in which the core module 10, when worn, is located near or farther from the top of the head; that is, the lateral direction Z can be parallel to the vertical axis or at an angle other than 0° to it. In some embodiments, the free end FE is pressed into the cavity 2002 in the thickness direction X. As another example, the free end FE rests against the cavity 2002 in the longitudinal direction Y and / or the lateral direction Z. In some embodiments, the direction from the connecting end CE to the free end FE can be the longitudinal direction Y'.Of course, it can also be different from the longitude direction Y according to structural needs.

[0018] It should be noted that in the worn state, in addition to the free end FE of the core module 10 protruding into the cavum conchae 2002, it is also possible that an orthogonal projection of the free end of the same falls onto the antihelix 2005, or that this orthogonal projection falls onto the left or right side of the head and lies on the sagittal axis at the front of the ear 200.

[0019] Of course, in other scenarios it is also possible that an orthogonal projection of the core module 10 falls at least partially on the antihelix 2005, or that this orthogonal projection falls on the left or right side of the head and lies on the sagittal axis at the front of the ear 200.

[0020] In other words, the ear hook 20 can support the core module 10 so that it can be worn in a wearing position, such as the cavum conchae 2002, the antihelix 2005 or the front of the ear 200.

[0021] Referring to Fig. 1, Fig. 2 and Fig. 5. The core module 10, when supported and viewed along the coronal axis, can be circular, elliptical, square with rounded corners, rectangular with rounded corners, etc. To simplify the description, this embodiment is therefore described using the example of a rectangular core module 10 with rounded corners. In some embodiments, the length of the core module 10 in the longitudinal direction Y can be greater than the width of the core module 10 in the lateral direction Z.

[0022] In its worn state, the core module 10 can have, in the thickness direction X, an inner surface IS facing the ear 200, an outer surface OS facing away from the ear 200, and a connecting surface (such as a bottom surface LS, a top surface US, an outer end surface RS, or the like) connecting the inner surface IS to the outer surface OS. In the worn state, the top surface US connects the inner surface IS to the outer surface OS, and the bottom surface LS connects the inner surface IS to the outer surface OS. The top surface US is located closer to the top of the user's head in the width direction Z, and the bottom surface LS is located further away from the top of the user's head in the width direction Z. Furthermore, the outer end surface RS connects not only the top surface US to the bottom surface LS, but also the inner surface IS to the outer surface OS.The thickness direction X can also be defined as the direction in which the core module 10 is located near or farther from the ear 200 when worn. The connecting surface, such as the outer end surface RS, is located at least partially within the concha 2002 when worn and forms a first contact zone with the front surface of a region of the ear 200. That is, the outer end surface RS can be located at an end of the length direction Y oriented towards the back of the head when worn and lies at least partially within the concha 200. In some embodiments, the ear hook 20 forms a second contact zone with the back surface of a region of the ear 200 when worn. The second contact zone and the first contact zone overlap at least partially in the region of the ear 200 in the direction of the ear's thickness.Furthermore, not only can the core module 10 and the ear hook 20 together clamp the ear 200 from the front and back, but the clamping force generated acts primarily as a compressive force, which contributes to improving the stability and comfort of the earphone 100 when worn. If the core module 10 is circular, elliptical, or otherwise shaped, in some embodiments the connecting surface may also refer to a curved side of the core module 10.

[0023] It should be noted that the terms "first", "second", "third", and the like are used in this application for descriptive purposes only and cannot be understood as representing or implying relative importance or as implying the number of technical features depicted. Thus, features defined by "first", "second", "third", and the like may explicitly or implicitly include at least one of the features. In the explanatory notes to this application, the word "several" refers to at least two, such as two, three, etc., unless expressly defined otherwise.

[0024] It is understood that the core module 10 can also be worn directly or in another way. Wearing it can even be achieved by fitting the core module to the ear hook 20 or by connecting it to or fitting it to another structure. Furthermore, the functions to be fulfilled by the core module 10 are not limited to the embodiments listed in the present application. In some embodiments, the ear hook 20 can be omitted or replaced by another structure.

[0025] If the way the core module 10 is worn is changed, the way in which the core module 10 fits the ear 200 can also be changed. In some embodiments, however, this does not necessarily lead to a change in the internal structure, the overall construction, the external structure, or the like of the core module 10. In some embodiments, it is even possible that terms relating to orientations, such as bottom LS, top US, outer end RS, and the like, do not necessarily have corresponding relationships to the ear 200. In some embodiments, it is of course possible that terms such as connecting end CE and the like only represent terms relating to orientations and do not necessarily imply that they contain a specific function.

[0026] If the way the core module 10 is worn is changed, the core module 10 can also be worn without fitting the ear hook 20 or any other structure at the connection end CE.

[0027] See Fig. 6 and Fig. 7. Fig. Figure 6 shows a cutaway view of the 100 earphone. Fig. 1 in some embodiments along line VI-VI; and Fig. Figure 7 shows a cutaway view of the 100 earphone. Fig. 1 in some embodiments along line VII-VII. The core module 10 can comprise a core housing 11, a loudspeaker assembly 12, and a main control circuit board 13. The core housing 11 can be connected to the ear hook 20. The core housing 11 can have a mounting space 101, which serves for mounting the loudspeaker assembly 12 and the main control circuit board 13, or, of course, can also serve for mounting another electronic element, without repeating this. The loudspeaker assembly 12 and the main control circuit board 13 can, for example, be arranged in the mounting space 101 of the core housing 11. The main control circuit board 13 can be electrically connected to the loudspeaker assembly 12 to control the loudspeaker assembly 12 for operation.It is understood that the core housing 11 serves as the outer housing of the core module 10 and, in turn, the inner surface IS, the outer surface OS and the connecting surfaces connecting the inner surface IS with the outer surface OS (for example, the underside LS, the top surface US and the back surface RS etc.) of the aforementioned core module 10 are formed on the core housing 11 and serve as outer surfaces of the core housing 11.

[0028] The core housing 11 can comprise a first housing 111 and a second housing 112, which interlock in the thickness direction X to form the mounting space 101. In the worn state, the first housing 111 is closer to the ear 200 than the second housing 112. The first housing 111 and the second housing 112 have a parting line 102 between them to simplify the structure of the core housing 11 and thus reduce machining costs. Of course, the core housing 11 can also be designed in the form of a different structure, and this is not limited to the embodiments listed in the present application.

[0029] In some embodiments, the core housing 11 can be provided with a first sound outlet opening 1101 and a second sound outlet opening 1102, which communicate with the mounting space 101. The first sound outlet opening 1101 and the second sound outlet opening 1102 can each be aligned with the loudspeaker arrangement 12, so that the sound waves generated by the loudspeaker arrangement 12 can propagate through the first sound outlet opening 1101 and the second sound outlet opening 1102, respectively. The first sound outlet opening 1101 and the second sound outlet opening 1102 can be separate and not communicate with each other. By providing two sound outlet openings, the acoustic performance of the loudspeaker arrangement 12 can be improved, thus preventing interference of the sound waves between multiple loudspeakers.

[0030] See Fig. 8. Fig. Figure 8 shows a schematic structural representation of the first housing 111 made of Fig. 6 in some embodiments. In some embodiments, the first sound outlet opening 1101 and / or the second sound outlet opening 1102 can be provided in the first housing 111. For example, the first sound outlet opening 1101 and the second sound outlet opening 1102 can both be provided in a bottom wall 1111 of the first housing 111. In some embodiments, the bottom wall 1111 can be arranged corresponding to the inner side IS of the core module 10. If the carrying method in which the core module 10 projects into the Cavum conchae 2002 is used, a certain distance can exist between a part of the inside IS, which corresponds to the bottom wall 1111 of the core casing 11, and the Cavum conchae 2002 after the free end FE projects into the Cavum conchae 2002, because the Cavum conchae 2002 can have a certain volume and a certain depth.Furthermore, when worn, the core housing 11, together with the cavum conchae 2002, can form an auxiliary chamber communicating with the external auditory canal 2001. The first sound outlet 1101 and the second sound outlet 1102 can be at least partially opposite and communicating with the auxiliary chamber. Furthermore, when worn, the sound waves generated by the loudspeaker assembly 12 and propagated through the first sound outlet 1101 and the second sound outlet 1102 are limited by the auxiliary chamber; that is, the auxiliary chamber can focus the sound waves. This allows more sound waves to be transmitted into the external auditory canal 2001, thus improving the volume and sound quality of the sound heard by the user in the near field, which contributes to improving the acoustic performance of the earphone 100.

[0031] In some embodiments, the first sound outlet opening 1101 and the second sound outlet opening 1102 can both be located closer to the free end FE than to the connecting end CE, so that, when worn, the first sound outlet opening 1101 and the second sound outlet opening 1102 are located closer to the external auditory canal 2001. In some embodiments, the core module 10 can be arranged such that, when worn, it does not block the external auditory canal 2001, allowing the auxiliary chamber to be partially open.

[0032] See Fig. 7 and Fig. 8. The first housing 111 can be designed as a plastic part, or as a composite or connected structure made of several materials, or, of course, as a housing structure made of another material. The first housing 111 can include a first side wall 1112 extending from an edge of the bottom wall 1111 to a side near the second housing 112. In some embodiments, the first side wall 1112 can be provided with a pressure relief opening 1104 and / or a tuning opening 1105. That is, the top surface US and / or the bottom surface LS of the core housing 11 can accordingly be provided with the pressure relief opening 1104 and / or the tuning opening 1105. Furthermore, it is provided that a sound-absorbing mesh and / or a steel protective mesh or the like can be provided at the pressure relief opening 1104 and / or at the tuning opening 1105.

[0033] It is understood that the positions of the acoustic openings, such as the pressure relief opening 1104 and the tuning opening 1105, and the like, can be adjusted according to the needs of the experts in this field, for example, on the first housing 111 of the core housing 11. For example, the pressure relief opening 1104 and the tuning opening 1105 can be arranged on both opposite sides of the first side wall 1112 in the lateral direction Z.

[0034] Furthermore, by arranging the first sound outlet 1101, the pressure relief opening 1104, and the tuning opening 1105 all on the first housing 111, the first housing 111 has a simpler structure, which contributes to reducing machining costs. Additionally, by arranging the pressure relief opening 1104 and the tuning opening 1105 on opposite sides of the first side wall 1112 in the width direction Z, the aforementioned mold parting line 102 can be arranged approximately symmetrically with respect to a reference plane perpendicular to the width direction Z, which contributes to improving the optical quality of the core module 10.

[0035] Furthermore, the acoustic openings are not limited to the pressure relief opening 1104 and the tuning opening 1105. Other acoustic openings suitable for the loudspeaker arrangement 12 may also be included. In some embodiments, at least one of the pressure relief opening 1104 and one of the tuning opening 1105 may be omitted.

[0036] See Fig. 9. Fig. Figure 9 shows a schematic structural representation of the first housing 111 made of Fig. 8 from a different perspective. The first sound outlet 1101 and the second sound outlet 1102 are positioned close together. By appropriately arranging the positions of the sound outlets, it is possible, when worn, to balance the sound emitted through the first sound outlet 1101 and the second sound outlet 1102 in order to improve the user's listening experience. In some embodiments, the first sound outlet 1101 can be arranged surrounding the circumference of the second sound outlet 1102 to further enhance the magnetic properties of the sound from the loudspeaker arrangement 12.In comparison to the straight arrangement of the first sound outlet opening 1101, it is of course more advantageous by means of the surrounding arrangement of the first sound outlet opening 1101 to provide a sufficient opening area for the sound outlet opening in a limited arrangement space on the first housing 111, so that the agreement of hearing for different persons is ensured.

[0037] In some embodiments, the inner surface IS of the core housing 11 (for example, the bottom wall 1111 corresponding to the inner surface IS) can be provided with a projection 1113 extending in the thickness direction X. The second sound outlet opening 1102 can be located on the projection 1113. Part of the loudspeaker assembly 12 can be accommodated in the projection 1113, so that, when worn, the part of the loudspeaker assembly 12 accommodated in the projection 1113 can be located closer to the user's ear canal. The interval between the sound waves generated by the loudspeaker assembly 12 and propagated through the second sound outlet opening 1102 to the outer ear canal 2001 is shortened, the loss of the sound waves is reduced, and thus the sound pressure level in the outer ear canal 2001 is increased. Of course, in some embodiments, the first sound outlet opening 1101 can also be located on the projection 1113.The first sound outlet 1101 can be located closer to or directly opposite the concha 2002 via the projection 1113, so that the sound emitted through the first sound outlet 1101 is reflected and amplified by physiological body parts such as the concha 2002 or the like. In some embodiments, the first sound outlet 1101 can be arranged peripherally surrounding the projection 1113, so that the core housing 11 has a more compact structure and, at the same time, when worn, the interval between the sound propagated through the first sound outlet 1101 and the second sound outlet 1102 to the user's ear canal 2001 is small, in order to ensure consistent hearing.

[0038] In some embodiments, the projection 1113 extends upwards in a direction away from the inner surface IS (for example, the bottom wall 1111 corresponding to the inner surface IS) of the core housing 11, compared to other areas on the inner surface IS. In some other embodiments, the projection 1113 can also be provided on the underside or on another connecting surface of the aforementioned core housing 11 in order to adapt to different carrying scenarios.

[0039] In some embodiments, a cross-sectional surface of the projection 1113 perpendicular to the thickness direction X can gradually decrease in size in a direction away from the core housing 11.

[0040] See Fig. 9. The first sound outlet opening 1101 can comprise a first opening segment 1114 and a second opening segment 1115. In some embodiments, the first opening segment 1114 and the second opening segment 1115 can be provided on the inner side IS. See Fig. 9. The first opening segment 1114 is located on a side of the second sound outlet opening 1102 that is close to the underside LS, and the second opening segment 1115 is located on a side of the second sound outlet opening 1102 that is close to the outer end surface RS. This allows the first sound outlet opening 1101 to be closer to the user's outer ear canal 2001 when worn (for example, when the free end FE of the core module 10 projects into the cavum conchae 2002), so that the sound emitted by the core module 10 can be transmitted more into the user's outer ear canal 2001, thus ensuring sufficient volume for hearing. For example, the first opening segment 1114 is located on a side of the second sound outlet opening 1102 that is close to the underside LS, and the second opening segment 1115 is located on a side of the second sound outlet opening 1102 that is away from the outer end surface RS.This avoids the influence on the user's wearing experience caused by the formation of the second opening segment 1115.

[0041] In some embodiments, the first opening segment 1114 can also be provided at a corner where the inner surface IS connects to the underside LS. The second opening segment 1115 is provided at a corner where the inner surface IS connects to the outer end surface RS. When worn (for example, when the core module 10 is partially in contact with the antihelix 2005), the first sound outlet opening 1101 can be directed towards the user's outer ear canal 2001 to improve sound direction and thus increase the volume of hearing. In some other embodiments, the first opening segment 1114 can be located on the inner surface IS and the second opening segment can be located at the corner where the inner surface IS connects to the outer end surface RS.In some embodiments, the first opening segment 1114 can be provided in a connecting surface between the inner surface IS and the underside LS (for example, at the corner where the inner surface IS is connected to the underside LS). In some embodiments, the second opening segment 1115 is provided in a connecting surface between the inner surface IS and the outer end surface RS (for example, at the corner where the inner surface IS is connected to the outer end surface RS).

[0042] In some embodiments, the first opening segment 1114 extends from a connection point with the second opening segment 1115 in the longitudinal direction Y and has a width of 1 mm to 2.5 mm in the lateral direction Z. The second opening segment 1115 extends at a connection point with the first opening segment 1114 in the lateral direction Z and has a width of 1 mm to 2.5 mm in the longitudinal direction Y. In some embodiments, the first opening segment 1114 extends from the connection point with the second opening segment 1115 in the longitudinal direction Y, and its width gradually decreases in the lateral direction Z. Simultaneously, the second opening segment 1115 extends at the connection point with the first opening segment 1114 in the lateral direction Z, and its width gradually increases in the longitudinal direction Y.This prevents the first opening segment 1114, which is closer to the underside LS or the topside US, and another acoustic opening formed on the underside LS or the topside US from being subject to interference of the sound waves, thus ensuring the air permeability of the first sound outlet opening 1101 and thus avoiding any influence on the user's hearing.

[0043] In some embodiments, the pressure relief opening 1104 can be located on the top surface (US) or, of course, on the bottom surface (LS). If the pressure relief opening 1104 aligns with the first sound outlet opening 1101, this is also advantageous for reducing the interaction between the pressure relief opening 1104 and the first sound outlet opening 1101, for example, between the first opening segment 1114 and the second opening segment 1115.

[0044] In some embodiments, the first sound outlet opening 1101 can further comprise a third opening segment 1116. See Fig. 10 and Fig. 11. Fig. Figure 10 shows a schematic arrangement of the first sound outlet opening 1101 and the second sound outlet opening 1102. Fig. 9 in some other embodiments; and Fig. Figure 11 shows a schematic arrangement of the first sound outlet opening 1101 and the second sound outlet opening 1102. Fig. 10 in some other embodiments. The third opening segment 1116 can be connected to an end of the second opening segment 1115 that is further away from the first opening segment 1114 and is located on a side of the second sound outlet opening 1102 facing away from the first opening segment 1114. In some embodiments, the third opening segment 1116 can be provided on the inner side IS and is located on a side of the second sound outlet opening 1102 that is close to the upper side US. In this case, the first opening segment 1114 is located on a side of the second sound outlet opening 1102 that is close to the lower side LS.This means that the third opening segment 1116 communicates with the second opening segment 1115, and the third opening segment and the first opening segment 1114 are located on opposite sides of the second sound outlet opening 1102, so that the second opening segment 1115 connects the first opening segment 1114 with the third opening segment 1116 to form a single, integral part. In some embodiments, the third opening segment 1116 can be located at the corner where the inner surface IS connects to the top surface US. In some embodiments, the third opening segment 1116 can be located in a connecting surface between the inner surface IS and the top surface US (for example, at the corner where the inner surface IS connects to the top surface US).

[0045] In some embodiments, the provision of the third opening segment 1116 makes it possible for the first sound outlet opening 1101 to be axially symmetric in the longitudinal direction Y and to have a plane of symmetry PS formed in the longitudinal direction Y, so that the first sound outlet opening 1101 is designed as a “U-shaped” structure with an opening facing away from the outer end surface RS.

[0046] In some other embodiments, the third opening segment 1116 is provided on a side of the second sound outlet opening 1102 facing away from the outer end surface RS, and the third opening segment 1116 is connected to an end of the first opening segment 1114 that is further away from the second opening segment 1115. In these embodiments, the first sound outlet opening 1101 is designed as a "U-shaped" structure with one opening facing the upper surface US. In some other embodiments, the first opening segment 1114 is provided on a side of the second sound outlet opening 1102 that is close to the upper surface US. The third opening segment 1116 is provided on a side of the second sound outlet opening 1102 facing away from the outer end surface RS, and the third opening segment 1116 is connected to an end of the first opening segment 1114 that is further away from the second opening segment 1115.The first sound outlet opening 1101 is designed as a “U-shaped” structure with one opening facing the underside LS.

[0047] See Fig. 9, Fig. 10 and Fig. 11. In the longitudinal direction Y, the distance between a reference point a located furthest from the free end FE at an opening edge of the first sound outlet 1101 and the outer end surface RS is not less than 9 mm. It is understood that, for the outer end surface RS to be a circular arc surface in the longitudinal direction Y, the distance between the reference point a and a tangential surface located at a reference point on the outer end surface RS furthest from the connecting end CE in the longitudinal direction Y and perpendicular to the longitudinal direction Y, is not less than 9 mm. In some embodiments, the distance in the longitudinal direction Y between a reference point a located furthest from the free end FE at the opening edge of the first sound outlet 1101 and the outer end surface RS is in the range of 10 mm to 20 mm.This allows the arrangement of the first sound outlet opening 1101 in the core housing 11 to be optimized in order to ensure the air permeability of the first sound outlet opening 1101.

[0048] In some embodiments, the distance in the lateral direction Z between a reference point b located closest to the top surface US at the opening edge of the first sound outlet opening 1101 and the top surface US cannot be less than 1.5 mm. It is understood that, if the top surface US is a circular arc surface in the lateral direction Z, the distance between the reference point b and a tangential surface located at a reference point on the top surface US furthest from the bottom surface LS in the lateral direction Z and perpendicular to the lateral direction Z is not less than 1.5 mm. In some embodiments, the distance in the lateral direction Z between a reference point b located closest to the top surface US at the opening edge of the first sound outlet opening 1101 and the top surface US is in the range of 2 mm to 8 mm.This allows the arrangement of the first sound outlet opening 1101 in the core housing 11 to be optimized in order to avoid interference between the sound waves emitted through the first sound outlet opening 1101 and the sound waves emitted through another acoustic opening formed in the top US, thus ensuring the audible effect for the user.

[0049] See Fig. 10 and Fig. 11. The first sound outlet opening 1101 and the second sound outlet opening 1102 can be arranged in a plane almost perpendicular to the thickness direction X. In some embodiments, the shortest distance L between an opening edge of an orthogonal projection of the first sound outlet opening 1101 and an opening edge of an orthogonal projection of the second sound outlet opening 1102 in the plane perpendicular to the thickness direction X can limit the relative positional relationship between the first sound outlet opening 1101 and the second sound outlet opening 1102.In some embodiments, the shortest distance L between the opening edge of the orthogonal projection of the first sound outlet 1101 and the opening edge of the orthogonal projection of the second sound outlet 1102 is not less than 2 mm, so that interference with the sound waves propagated by the first sound outlet 1101 and the second sound outlet 1102, which would affect the user's hearing, can be avoided. In some embodiments, the shortest distance L between the opening edge of the orthogonal projection of the first sound outlet 1101 and the opening edge of the orthogonal projection of the second sound outlet 1102 is in the range of 2 mm to 5 mm, so that while avoiding interference with the sound waves, it is ensured that the first sound outlet 1101 has a sufficient air passage area.

[0050] See Fig. 12. Fig. Figure 12 shows a cutaway view of the 100 earphone. Fig. 1 in some other embodiments along line VII-VII. The second sound outlet opening 1102 can have a central axis AE, and the direction of a side of the central axis AE facing away from the core housing 11 can be a positive direction. In some embodiments, the direction of extension of the second sound outlet opening 1102 can be related to the central axis AE. In some embodiments, a connecting line between two centroids, i.e., between the centroid of an opening-formed surface of the second sound outlet opening 1102 on the inner side IS and the centroid of an opening-formed surface of the inner surface in the mounting space 101 of the 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 1102 can be perpendicular to a side (for example, the inner surface IS) of the core housing 11 on which the second sound outlet is located. In some embodiments, the positive direction of the central axis AE of the second sound outlet 1102 can be designed to form an angle of less than 90° to the side (for example, the inner surface IS) of the core housing 11 on which the second sound outlet is located, in order to direct the second sound outlet 1102 further towards the outer ear canal 2001 to enhance the hearing effect for the user. For example, if the second sound outlet is located on the inner surface IS of the core housing 11, the positive direction of the central axis AE of the second sound outlet 1102 can be inclined towards the top surface US, bottom surface LS, or outer end surface RS.In some embodiments, the angle between the positive direction of the central axis AE of the second sound outlet opening 1102 and a positive direction of the lateral direction Z is between 75° and 80°, and the positive direction of the lateral direction Z can refer to a direction in the lateral direction Z oriented from the top US to the bottom LS.

[0051] See Fig. 9, Fig. 10 and Fig. 11. In some embodiments, the dimension of the first sound outlet opening 1101 in the longitudinal direction Y is in the range of 6 mm to 8 mm, and the dimension of the first sound outlet opening 1101 in the lateral direction Z is in the range of 5 mm to 7 mm. This ensures that the first sound outlet opening 1101 has a sufficient air passage area and that the resonance frequency of a chamber of the loudspeaker coupled to the first sound outlet opening 1101 is in the ideal range.

[0052] See Fig. 6, Fig. 7 and Fig. 8. A concave recess 1103 is formed in the inner wall of the core housing 11 to accommodate the loudspeaker assembly 12, to increase the space utilization, for example, of the mounting space 101 of the core housing 11, and also to facilitate the positioning of the loudspeaker assembly 12. In some embodiments, the recess 1103 can be located on the circumference of the second sound outlet 1102, so that the space in the recess 1103 communicates with the second sound outlet 1102. In some embodiments, the recess 1103 can be arranged corresponding to the projection 1113. That is, the recess 1103 is provided on a side of the projection 1113 facing, for example, the interior of the mounting space 101 of the core housing 11. The loudspeaker assembly 12 can then be located at least partially within the recess 1103.

[0053] See Fig. 6. The second housing 112 can be designed as a plastic part, or as a composite or connected structure made of several materials, or, of course, as a housing structure made of a different material. The mold parting line 102 between the second housing 112 and, for example, the first side wall 1112 of the first housing 111 extends or curves in a direction close to the free end FE toward the side where the first housing 111 is located. The second housing 112 can comprise a top wall 1121, which, for example, faces the bottom wall 1111 of the first housing 111, and a second side wall 1122, which is connected to the top wall 1121 and interlocks with, for example, the first side wall 1112 of the first housing 111.

[0054] It can be understood that the arrangement of the second side wall 1122 gradually tapers the free end FE in a direction further away from the connecting end CE to facilitate fitting to the contour of the user's ear and thus improve the wearing experience.

[0055] See Fig. 6, Fig. 7 and Fig. 13. Fig. Figure 13 shows a schematic structural representation of the loudspeaker arrangement 12. Fig. 6. The loudspeaker assembly 12 can convert received electrical signals into acoustic signals (sound waves), and these can be propagated through the first sound outlet 1101 and / or the second sound outlet 1102 to be transmitted into the external auditory canal 2001. The loudspeaker assembly 12 can be coupled to the main control circuit board 13 to enable operation under the control of the main control circuit board 13. The loudspeaker assembly 12 can comprise a first loudspeaker 121 and a second loudspeaker 122, which are arranged, for example, in the mounting space 101 of the core housing 11. The first loudspeaker 121 and the second loudspeaker 122 can each be coupled to the main control circuit board 13 to enable operation under the control of the main control circuit board 13. The sound waves generated by the first loudspeaker 121 can be propagated through the first sound outlet 1101.The sound waves generated by the second loudspeaker 122 can be propagated through the second sound outlet opening 1102. In some embodiments, the sound waves generated by the first loudspeaker 121 and the sound waves generated by the second loudspeaker 122 can also be propagated through other acoustic openings (for example, the pressure relief opening 1104 and the tuning opening 1105) provided in the core housing 11.

[0056] In some embodiments, the sound waves generated by the first loudspeaker 121 can be propagated through the first sound outlet 1101 (for example, the first outlet segment 1114 or the second outlet segment 1115). The sound waves generated by the second loudspeaker 122 can be propagated through the second sound outlet 1102. The sound waves generated by the first loudspeaker 121 can, of course, also be propagated through the third outlet segment 1116.

[0057] The frequency range of the sound emitted by the first loudspeaker 121 is at least partially lower than the frequency range of the sound emitted by the second loudspeaker 122. In some embodiments, the frequency range of the sound emitted by the first loudspeaker 121 can be entirely lower than the frequency range of the sound emitted by the second loudspeaker 122. In some other embodiments, the frequency range of the sound emitted by the first loudspeaker 121 can partially overlap with the frequencies of the sound emitted by the second loudspeaker 122, and the maximum frequency of the sound emitted by the first loudspeaker is lower than the maximum frequency of the sound emitted by the second loudspeaker.This means that the frequency band of the sound emitted by the second loudspeaker 122 can be partially larger than the frequency band of the sound emitted by the first loudspeaker 121.

[0058] In some embodiments, the frequency range of the sound emitted by the first loudspeaker 121 can range from 20 Hz to 5 kHz, and the frequency range of the sound emitted by the second loudspeaker 122 can range from 5 kHz to 20 kHz. In some embodiments, the frequency range of the sound emitted by the first loudspeaker 121 and the frequency range of the sound emitted by the second loudspeaker 122 can have different standards based on actual situations. For example, the range of the sound emitted by the first loudspeaker 121 can refer to a frequency range not higher than 1 kHz, for example, 1 Hz to 1 kHz, 100 Hz to 800 Hz, etc.

[0059] In some embodiments, the frequency range of the sound emitted by the first loudspeaker 121 can be referred to as the low-frequency band or the mid-frequency / low-frequency band, and the frequency range of the sound emitted by the second loudspeaker 122 can be referred to as the high-frequency band or the mid-frequency / high-frequency band. Thus, the first loudspeaker 121 can be referred to as the low-frequency loudspeaker and the second loudspeaker 122 as the high-frequency loudspeaker. The low-frequency band can refer to at least a portion of the frequency band from essentially 20 Hz to 500 Hz or at least a portion of the frequency band from essentially 20 Hz to 3 kHz. The high-frequency band can refer to at least a portion of the frequency band from essentially 5 kHz to 20 kHz or at least a portion from 6 kHz to 16 kHz.The mid-frequency band can either lie between the low-frequency band and the high-frequency band, or partially overlap with the low frequencies and / or the high frequencies. Thus, the mid-frequency or low-frequency band can refer to a portion of the low-frequency band and the mid-frequency band, respectively. The mid-frequency or high-frequency band can refer to a portion of the mid-frequency band and the high-frequency band.

[0060] It should be understood that the distinction between the frequency bands above serves only as an example and indicates approximate ranges. The definition of the above frequency bands can vary depending on different industries, application scenarios, and classification criteria. For example, in some other application scenarios, low frequencies refer to the frequency band from essentially 20 Hz to 80 Hz. Medium or low frequencies may refer to the frequency band from essentially 80 Hz to 160 Hz. Medium frequencies may refer to the frequency band from essentially 160 Hz to 1280 Hz. Medium or high frequencies may refer to the frequency band from essentially 1280 Hz to 2560 Hz. High frequencies may refer to the frequency band from essentially 2560 Hz to 120 kHz.

[0061] See Fig. 6 and Fig. 7. The first loudspeaker 121 can be mounted in the core housing 11. The axial direction of the first loudspeaker 121 can be in the thickness direction X. In some embodiments, the first loudspeaker 121 can be mounted, for example, on the bottom wall 1111 of the first housing 111, or, of course, on the first side wall 1112 or at another location on the core housing 11. In some embodiments, the axial direction of the first loudspeaker 121 can represent the direction of vibration of the first diaphragm 1211.

[0062] In some embodiments, the first loudspeaker 121 can be designed as a strip-shaped structure and fit, for example, into the mounting space 101 of the core housing 11. That is, the first loudspeaker 121 can be designed to extend in one direction from the connecting end CE to the free end FE, thus helping to arrange a sufficiently large first loudspeaker 121 in, for example, the mounting space 101 of the core housing 11. This increases the volume of the sound from the earphone 100, i.e., the arrangement is optimized and the space utilization is increased.

[0063] See Fig. 7. The first loudspeaker 121 can further comprise a first diaphragm 1211 for sound generation by vibration, a first magnetic circuit system 1212 that sets the first diaphragm 1211 into vibration for sound generation by vibration, and a support element for supporting the first diaphragm 1211 and the first magnetic circuit system 1212, etc. Within the scope of the understanding of those skilled in the art in this field, the technical principle by which the first magnetic circuit system 1212 sets the first diaphragm 1211 into vibration for sound generation by vibration through the interaction of a first coil with a magnet will not be repeated here.

[0064] The first loudspeaker 121 is located (for example, in the mounting space 101) in the core housing 11 and fits the core housing 11. A first front chamber 1201 can be formed on a front side of the first diaphragm 1211 of the first loudspeaker 121, and a first rear chamber 1202 can be formed on a rear side of the first diaphragm 1211. The front side of the first diaphragm 1211 is a side of the first diaphragm 1211 facing away from the first magnetic circuit system 1212. The rear side of the first diaphragm 1211 is a side of the first diaphragm 1211 facing the first magnetic circuit system 1212. In some embodiments, the first front chamber 1201 is located on a side of the first loudspeaker 121 facing the inside IS of the core housing 11, for example, on a side facing the bottom wall 1111 of the first housing 111.The first rear chamber 1202 is located on a side of the first loudspeaker 121 facing away from the inner surface IS, for example, on a side facing away from the bottom wall 1111 of the first housing 111. In some embodiments, the first front chamber 1201 can communicate with the first sound outlet opening 1101, so that the sound waves generated by the first loudspeaker 121 fitting into the first front chamber 1201 can propagate through the first sound outlet opening 1101. The first rear chamber 1202 can be coupled with other acoustic openings (for example, the pressure relief opening 1104 and the tuning opening 1105) in the core housing 11, so that the sound waves generated by the first loudspeaker 121 fitting into the first rear chamber 1202 can propagate through the other acoustic openings.

[0065] The second loudspeaker 122 is located in the core housing 11. See Fig. 6 and Fig. 7. The second loudspeaker 122 can be attached, for example, to the bottom wall 1111 of the first housing 111. The axial direction of the second loudspeaker 122 can run in the thickness direction X. In some embodiments, the second loudspeaker 122 can be located in the first front chamber 1201 of the first loudspeaker 121. In this case, the axial direction of the first loudspeaker 121 runs parallel to the axial direction of the second loudspeaker 122. In some other embodiments, the second loudspeaker 122 can, of course, also be attached to the first side wall 1112 or to another location within the core housing 11. Alternatively, depending on the required arrangement, it can also be located outside the first front chamber 1201. Naturally, the axial direction of the second loudspeaker 122 can also be arranged at an angle to the thickness direction X.

[0066] In some embodiments, the second loudspeaker 122 can be embedded in an inner wall of the core housing 11. For example, the inner wall of the core housing 11 can be provided with a groove to receive the second loudspeaker 122 in order to realize the embedded arrangement of the second loudspeaker 122. See Fig. 7. The groove (for example, the recess zone 1103) for receiving the second loudspeaker 122 can be formed in the bottom wall 1111 of the first housing 111, wherein, when worn, the second loudspeaker 122 is located on the inner wall of the inside IS of the aforementioned core module 10 and is closer to the user's ear. Alternatively, for example, the groove for receiving the second loudspeaker 122 can be provided on the underside or on the inner wall of the single connecting surface of the aforementioned core module 10 to adapt to different wearing scenarios and thus offer a better acoustic experience for the user.

[0067] See Fig. 14. Fig. Figure 14 shows a schematic circuit diagram of the loudspeaker arrangement 12 in some embodiments of the present application. The loudspeaker arrangement 12 can comprise a first terminal 1301 and a second terminal 1302, each electrically connected to the main control circuit board 13. The first loudspeaker 121 can be connected in series between the first terminal 1301 and the second terminal 1302 and thus generate sound under the control of the main control circuit board 13. The second loudspeaker 122 can be connected in series between the first terminal 1301 and the second terminal 1302 and thus generate sound under the control of the main control circuit board 13.

[0068] As described above, the first front chamber 1201 and the first rear chamber 1202 of the first loudspeaker 121 are each coupled to the first sound outlet 1101 and another acoustic opening (for example, the pressure relief opening 1104) in the core housing 11. Because the first front chamber 1201 and the first rear chamber 1202 are located on either side of the first diaphragm 1211 and naturally emit sound waves out of phase, the sound waves emitted by the first front chamber 1201 and the first rear chamber 1202 can cancel each other out of phase in the far field, thus reducing the sound loss of the earphone 100. However, when sound is emitted in the higher frequency band, the sound in the higher frequency band has a shorter wavelength.In the far field, the first front chamber 1201 and the first rear chamber 1202 correspond to two sound sources, so the distance between the two sound sources is not negligible with respect to wavelength. This means that the sound signals generated by the two sound sources cannot cancel each other out. Furthermore, when the acoustic transmission structure of the earphone 100 resonates, there is a certain phase deviation between the sound signals actually radiated by the first front chamber 1201 and the first rear chamber 1202 and the original phase at a sound wave generation point. This adds additional resonance peaks to the transmitted sound waves. This leads to a chaotic sound field distribution and makes it more difficult to ensure the effectiveness of reducing sound loss in the far field at high frequencies; in fact, it may even increase sound loss.

[0069] Therefore, it is necessary to process the sound emitted by the first loudspeaker 121 in the high-frequency band to avoid significant sound loss in the far field in this band. Accordingly, according to some embodiments of the present application, it is already possible for the first loudspeaker 121 to emit sound only in the low-frequency band. In the low-frequency band, the phases of the sound waves generated by the aforementioned first loudspeaker 121 are independent of the chamber structure (such as the first front chamber 1201 and / or the first rear chamber 1202) and can cancel each other out in the far field to reduce sound loss in the far field. Simultaneously, this allows the second loudspeaker 122 to emit sound only in the high-frequency band.The high-frequency focus ensures that the sound is primarily directed towards the outer ear canal of the human ear, thus reducing sound loss. This ensures that the 100 earphone effectively reduces sound loss across entire frequency bands.

[0070] In some embodiments, the first front chamber 1201 can have a first resonant frequency and the first rear chamber 1202 can have a second resonant frequency.

[0071] As an example only, the first resonant frequency can be tested as follows. A test device, such as a microphone, is positioned near and aimed directly at the earphone 100 (for example, directly at the first sound outlet 1101 coupled to the first front chamber 1201) according to measurement methods and standards known to experts in this field. The earphone 100 is excited by a signal generator, such as the main control circuit board 13. After completion of the test, a frequency response curve relevant to the first front chamber 1201 can be determined, and the first resonant frequency can be derived from this frequency response curve by further analysis.

[0072] Furthermore, the second resonant frequency can be tested as follows. A test device, such as a microphone, is positioned near and aimed directly at the earphone 100 (for example, directly at the acoustic opening coupled to the first rear chamber 1202, such as the pressure relief opening 1104) according to measurement methods and standards known to experts in this field. The earphone 100 is excited by a signal generator, such as the main control circuit board 13. After completion of the test, a frequency response curve relevant to the first rear chamber 1202 can be determined, and the second resonant frequency can be derived from this frequency response curve by further analysis.

[0073] It is understood that the distance between the test device, such as the microphone, and the earphone 100 (for example, the acoustic opening, such as the first sound outlet 1101 or the pressure relief opening 1104) is to be determined according to the requirements of the measurement methods and standards known to experts in this field. Naturally, this distance can also be defined as being smaller than a predetermined distance threshold (for example, 5 cm).

[0074] The first front chamber 1201 and the first sound outlet 1101 can be considered a model of a Helmholtz resonator, where the first front chamber 1201 corresponds to the chamber of the model Helmholtz resonator and the first sound outlet 1101 corresponds to the neck of the model Helmholtz resonator. The resonance of the model Helmholtz resonator corresponds to the first resonance frequency of the first front chamber 1201. In the model Helmholtz resonator, the volume of the first front chamber 1201 can influence the first resonance frequency f of the first front chamber 1201, and the specific relationship between them is as follows: f=c2πSVL in formula (1) c represents the speed of sound in air, S represents the sound exit area (also called cross-sectional area) of the throat (e.g. of the first sound exit opening 1101), V represents the volume of the chamber (e.g. of the first front chamber 1201) and L represents the depth of the throat (e.g. of the first sound exit opening 1101).

[0075] It follows from formula (1) that the first resonance frequency f can be adjusted by changing the sound exit area S of the first sound exit opening 1101 or the volume V of the first front chamber 1201. For example, if the other conditions remain unchanged and the volume of the first front chamber 1201 is increased, the first resonance frequency f moves towards lower frequencies. Similarly, the first rear chamber 1202 and an acoustic opening coupled to it can also be considered a model of the Helmholtz resonator, and the second resonance frequency can be adjusted accordingly. This will not be repeated here.

[0076] In some embodiments, the second resonant frequency can be lower than the first resonant frequency, and the deviation of the first resonant frequency from the second resonant frequency may not exceed 1000 Hz. This allows the sound transmitted from the first front chamber 1201 and the first rear chamber 1202 to cancel each other out more effectively in the far field, thus reducing sound loss from the earphone and improving the user's privacy experience. For example, the first resonant frequency is in the range of 4.5 kHz to 5.5 kHz, and the second resonant frequency is in the range of 4 kHz to 5 kHz.

[0077] In some embodiments, the first resonance peak of the first front chamber 1201 can be adjusted by changing the volume of the first front chamber 1201. In other words, increasing the volume of the first front chamber 1201 allows the first resonance peak of the first front chamber 1201 to move towards the low-frequency band. Because the sound pressure level of the sound generated by the chamber in the frequency band after the resonance frequency is rapidly attenuated, the first resonance frequency of the first front chamber 1201 moves towards the low-frequency band, and, in addition, the high-frequency sound waves generated by the first loudspeaker 121 are attenuated. As a result, the first loudspeaker 121 only emits sound in the low-frequency band, while the high-frequency sound waves are reproduced as completely as possible by the second loudspeaker 122.This allows the desired effect of reducing sound loss from the earphone across entire frequency bands.

[0078] In some embodiments, the volume of the first front chamber 1201 can be in the range of 270 mm². 3 up to 400 mm 3 The volume of the first front chamber 1201 can be adjusted. By limiting the volume of the first front chamber 1201, the first resonant frequency of the first front chamber 1201 shifts towards the low-frequency band, and the high-frequency sound waves generated by the first loudspeaker 121 are also attenuated. In other words, adjusting the volume of the first front chamber 1201 creates a low-pass filter. In some embodiments, the volume of the first front chamber 1201 can be adjusted within a range of 290 mm³. 3 up to 350 mm 3 In some embodiments, the volume of the first front chamber can be 1201,300 mm³. 3 or 310 mm 3The design regarding the volume of the first front chamber 1201 is intended to dampen the high-frequency sound waves generated by the first loudspeaker 121, so that it is also possible to adjust the volume of the first front chamber 1201 according to the needs of the experts in this field.

[0079] See Fig. 15. Fig. Figure 15 shows a schematic representation of the relationship between the volume of the first front chamber 1201 and the resonance frequency of the first front chamber 1201 in an embodiment of the present application. The volume V1 is 270 mm³. 3 , the volume V2 310 mm 3 and the volume V3 350 mm 3 V1, V2, and V3 each correspond to a frequency response curve of the chamber. During the process of increasing the volume of the first front chamber 1201 from 270 mm³ 3 up to 350 mm 3It is evident from the curves corresponding to volume V1, volume V2, and volume V3 that the first resonance frequency of the first front chamber 1201 decreases from 5.1 kHz to 4.8 kHz. It can be seen that with the increase in volume of the first front chamber 1201, the first resonance frequency of the first front chamber 1201 shifts towards lower frequencies.

[0080] It is to be understood that, in order to realize the movement of the first resonance frequency of the first front chamber 1201 to the low-frequency frequency band, it is possible not only to define the volume of the first front chamber 1201, but also the position and shapes of the first sound outlet opening 1101 in, for example, Fig. 9, Fig. 10 and Fig. 11 to be designed according to the above embodiments in order to realize the movement of the first resonant frequency to the low-frequency frequency band.

[0081] In some embodiments, the second loudspeaker 122 can have a third resonant frequency. In some embodiments, the third resonant frequency of the second loudspeaker 122 cannot be lower than 5.5 kHz. Thus, in conjunction with the first loudspeaker 121, the overall sound quality of the earphone 100 is not affected by the high-frequency sound waves generated by the first loudspeaker 121 being effectively augmented by the second loudspeaker 122 after the high-frequency sound waves have been attenuated. In some embodiments, the third resonant frequency of the second loudspeaker 122 cannot be lower than 6 kHz. In some embodiments, the third resonant frequency of the second loudspeaker 122 can be between 6 kHz and 10 kHz.

[0082] In some embodiments, the deviation of the third resonant frequency from the first resonant frequency and the deviation of the third resonant frequency from the second resonant frequency are each not less than 2000 Hz. Thus, in conjunction with the first loudspeaker 121, the overall sound quality of the earphone 100 is not affected by the high-frequency sound waves generated by the first loudspeaker 121 being effectively supplemented by the second loudspeaker 122 after the high-frequency sound waves have been attenuated. In some embodiments, the deviation of the third resonant frequency from the first resonant frequency and the deviation of the third resonant frequency from the second resonant frequency are each not less than 2500 Hz.

[0083] See Fig. 7 and Fig. 16. Fig. Figure 16 shows a schematic structural representation of the loudspeaker arrangement 12. Fig. 7 in some other embodiments. The second loudspeaker 122 can comprise a second diaphragm 1221 for sound generation by vibration, a second magnetic circuit system 1222 for driving the second diaphragm 1221 to generate sound, and a loudspeaker housing for supporting and mounting the second diaphragm 1221 and the second magnetic circuit system 1222. For those skilled in the art, the technical principle by which the second magnetic circuit system 1222, through the interaction of a second coil with a magnet, sets the second diaphragm 1221 into vibration to generate sound by vibration, is not repeated here. The loudspeaker housing is a different housing structure than the core housing 11 to facilitate flexible mounting of the second loudspeaker 122 on the core module 10.Part of the loudspeaker housing can be formed in one piece with the core housing 11, and the other part of the same can include a support frame for carrying the second loudspeaker 122, in order to further simplify the structure of the core module 10.

[0084] The second loudspeaker 122 is located (for example, in mounting space 101) in the core housing 11 and fits the core housing 11. A front side of the second diaphragm 1221 of the second loudspeaker 122, together with the loudspeaker housing, forms a second front chamber 1203, and a rear side of the second diaphragm 1221, together with the loudspeaker housing, forms a second rear chamber 1204. The front side of the second diaphragm 1221 is the side of the second diaphragm 1221 facing away from the second magnetic circuit system 1222. The rear side of the second diaphragm 1221 is the side of the second diaphragm 1221 facing the second magnetic circuit system 1222.If the second loudspeaker is located on an inner wall of the core module 10 corresponding to the inner IS, the second front chamber 1203 is located on a side of the second loudspeaker 122 facing the inner IS, and the second rear chamber 1204 is located on a side of the second loudspeaker 122 facing away from the inner IS.

[0085] The second front chamber 1203 can communicate with the second sound outlet 1102, so that the sound waves generated by the second loudspeaker 122 can be propagated through the second sound outlet 1102. In some embodiments, the first front chamber 1201 can communicate with the second front chamber 1203, so that the first sound outlet 1101 and the second sound outlet 1102 can both communicate with the first front chamber 1201 / the second front chamber 1203.In some other embodiments, the core housing 11 can also include structures such as a partition plate between the second loudspeaker 122 and the first loudspeaker 121 and the like, to separate a chamber coupled to the first loudspeaker 121 from a chamber coupled to the second loudspeaker 122, so that the first sound outlet 1101 communicates only with the first front chamber 1201 and the second sound outlet 1102 communicates only with the second front chamber 1203.

[0086] In some embodiments, the second loudspeaker 122 can be mounted at a location on the core housing 11 closer to the free end FE. That is, the length of the second loudspeaker 122 in the direction from the connecting end CE to the free end FE is less than the length of the first loudspeaker 121 in the same direction. This allows the second loudspeaker 122 to be located close to the free end FE when worn (for example, when the free end FE projects into the cavity 2002), so that the sound emitted through the second sound outlet 1102 can be transmitted more effectively to the user's ear canal, thus increasing the perceived volume.

[0087] In some embodiments, the second magnetic circuit system 1222 and the first magnetic circuit system 1212 are arranged in a mutually exclusive configuration to increase the magnetic flux density at the first coil in the first loudspeaker 121. The mutually exclusive configuration means that a magnetic pole of the second magnetic circuit system 1222 facing the first magnetic circuit system 1212 is a neutral pole, and a magnetic pole on a side of the first magnetic circuit system 1212 facing the second magnetic circuit system 1222 is a neutral pole, so that the second magnetic circuit system 1222 exerts a force on the first magnetic circuit system 1212, causing the first magnetic circuit system 1212 to move away from the second magnetic circuit system 1222, and that the first magnetic circuit system 1212 exerts a force on the second magnetic circuit system 1222, causing the second magnetic circuit system 1222 to move away from the first magnetic circuit system 1212.For example, a magnetic pole on a side of the second magnetic circuit system 1222 facing the first magnetic circuit system 1212 is an S-pole, and a magnetic pole on a side of the first magnetic circuit system 1212 facing the second magnetic circuit system 1222 is an S-pole. It is understood that the mutually exclusive arrangement between the second magnetic circuit system 1222 and the first magnetic circuit system 1212 also allows the magnetic flux density at the second coil to be increased, which is not repeated here.

[0088] Furthermore, it is provided that by increasing the magnetic flux density at the first coil / the second coil, the driving force by which the first coil vibrates the first diaphragm 1211 and the second coil vibrates the second diaphragm 1221 is amplified, thus increasing the sound pressure level of the sound waves emitted by the first loudspeaker 121 and the second loudspeaker 122. In some embodiments, the exclusion level between the second magnetic circuit system 1222 and the first magnetic circuit system 1212 can be configured such that the sound pressure level of the second loudspeaker 122 is increased by at least 1 dB compared to the sound pressure level during the individual operation of the second loudspeaker 122 (for example, the first loudspeaker 121 is omitted in the embodiment above).In some embodiments, the exclusion level between the second magnetic circuit system 1222 and the first magnetic circuit system 1212 can be arranged such that the sound pressure level of the second loudspeaker 122 is increased by at least 2 dB compared to the sound pressure level during the individual operation of the second loudspeaker 122.

[0089] In some embodiments, the exclusion level between the second magnetic circuit system 1222 and the first magnetic circuit system 1212 can also be configured such that the sound pressure level of the first loudspeaker 121 is increased by at least 1 dB compared to the sound pressure level during the individual operation of the first loudspeaker 121 (for example, the second loudspeaker 122 is omitted in the embodiment above). In some embodiments, the exclusion level between the second magnetic circuit system 1222 and the first magnetic circuit system 1212 can be configured such that the sound pressure level of the first loudspeaker 121 is increased by 2 dB compared to the sound pressure level when the first loudspeaker 121 is present.

[0090] Through the mutually exclusive interaction of the second magnetic circuit system 1222 with the first magnetic circuit system 1212, the sound pressure level of the first loudspeaker 121 and / or the second loudspeaker 122 can be increased. Simultaneously, while maintaining the sound pressure level of the sound emitted by the earphone 100, the mutually exclusive interaction of the second magnetic circuit system 1222 with the first magnetic circuit system 1212 reduces the relative distance between the second loudspeaker 122 and the first loudspeaker 121, thus reducing the volume of the earphone 100. This makes the earphone 100 lighter and smaller, thereby improving the wearing experience for the user. In some embodiments, the distance between the second loudspeaker 122 and the first loudspeaker 121 can be reduced to 2 mm.

[0091] In some embodiments, the projection of the second magnetic circuit system 1222 in the direction of vibration of the second diaphragm 1221 can be arranged to overlap the first magnetic circuit system 1212 at least partially, in order to ensure that the magnetic flux density at the first coil / the second coil is increased by the exclusion degree between the second magnetic circuit system 1222 and the first magnetic circuit system 1212. In some embodiments, the projection of the first magnetic circuit system 1212 in the direction of vibration of the first diaphragm 1211 is arranged to overlap the second magnetic circuit system 1222 at least partially, in order to ensure that the magnetic flux density at the first coil and / or the second coil is increased by the exclusion degree between the second magnetic circuit system 1222 and the first magnetic circuit system 1212.It is important to understand that the magnetic flux density at the first coil refers to the average magnetic flux density of the entire first coil. In some other scenarios, the magnetic flux density at the first coil may also refer to the magnetic flux density at a specific endpoint or some specific endpoints of the first coil. The same applies analogously to the magnetic flux density at the second coil, which will not be repeated here.

[0092] See Fig. 16. In some embodiments, the first magnetic circuit system 1212 can comprise a first magnet 1213 for driving the first diaphragm 1211 and a magnetically conductive cover 1214 arranged around the first magnet 1213. The first rear chamber 1202 is formed by acoustically coupling a side of the first diaphragm 1211 facing the first magnetic circuit system 1212 with another acoustic opening (for example, the pressure relief opening 1104) in the core housing 11. The first front chamber 1201 is formed by acoustically coupling a side of the first diaphragm 1211 facing away from the first magnetic circuit system 1212 with the first sound outlet opening 1101. The second magnetic circuit system 1222 can comprise a second magnet 1223 for driving the second diaphragm 1221 to generate sound. A side of the second membrane 1221 facing the second magnetic circuit system 1222 is defined as the second posterior chamber 1204.The second front chamber 1203 is formed by acoustic coupling of a side of the second diaphragm 1221 facing away from the second magnetic circuit system 1222 with the second sound outlet opening 1102.

[0093] The mutually exclusive arrangement of the aforementioned first magnetic circuit system 1212 and second magnetic circuit system 1222 can refer to a mutually exclusive arrangement of the magnetic poles of the second magnet 1223 and the first magnet 1213. See Fig. 16. In some embodiments, one magnetic pole on a side of the second magnet 1223 facing the first magnet 1213 is the N-pole, and another magnetic pole on a side of the first magnet 1213 facing the second magnet 1223 is also the N-pole. The magnetic poles of the first magnet 1213 and the second magnet 1223 are mutually exclusive. In some embodiments, the magnetic pole on a side of the second magnet 1223 facing the first magnet 1213 is also the S-pole, and the magnetic pole on a side of the first magnet 1213 facing the second magnet 1223 is also the S-pole. Again, the magnetic poles of the first magnet 1213 and the second magnet 1223 are mutually exclusive.

[0094] In some embodiments, the second magnet 1223 overlaps at least partially with the first magnet 1213 in a first reference plane perpendicular to the direction of vibration of the second diaphragm 1221. By adjusting the overlapping portion of the second magnet 1223 with the first magnet 1213, the degree of exclusion can be set, thus adjusting the sound pressure level and / or the volume of the earphone 100.

[0095] In some embodiments, the second magnetic circuit system 1222 can include a third magnet 1224, which, together with the second magnet 1223, drives the second diaphragm 1221 to generate sound. By driving the second diaphragm 1221 to generate sound together with the third magnet 1224, the acoustic performance of the second loudspeaker 122 is enhanced.

[0096] The third magnet 1224 can be arranged around the circumference of the second magnet 1223 and is located on the same side of the second diaphragm 1221 as the second magnet 1223. In some embodiments, a magnetic pole on the side of the third magnet 1224 facing the second diaphragm 1221 differs from a magnetic pole on the side of the second magnet 1223 facing the second diaphragm 1221 in the direction of vibration of the second diaphragm 1221. That is, the magnetic poles of the second magnet 1223 and the third magnet 1224 are opposite to each other in the direction of vibration of the second diaphragm 1221. For example, the magnetic pole on the side of the third magnet 1224 facing the second diaphragm 1221 is the N pole, and the magnetic pole on the side of the third magnet 1224 facing away from the second diaphragm 1221 is the S pole.The magnetic pole on the side of the second magnet 1223 facing the second membrane 1221 is the S-pole, and the magnetic pole on the side of the second magnet 1223 facing away from the second membrane 1221 is the N-pole. Similarly, the magnetic pole on the side of the third magnet 1224 facing the second membrane 1221 is the S-pole, and the magnetic pole on the side of the third magnet 1224 facing away from the second membrane 1221 is the N-pole. The magnetic pole on the side of the second magnet 1223 facing the second membrane 1221 is the N-pole, and the magnetic pole on the side of the second magnet 1223 facing away from the second membrane 1221 is the S-pole.

[0097] See Fig. 17 and Fig. 18. Fig. Figure 17 shows a schematic representation of the second magnet 1223, the third magnet 1224 and the first loudspeaker 121, which fit together, in some embodiments of the present application. Fig. Figure 18 shows a schematic representation of the relationship between a cross-sectional area of ​​the second magnet 1223 perpendicular to the direction of vibration of the second membrane 1221 and a cross-sectional area of ​​the third magnet 1224 perpendicular to the direction of vibration of the second membrane 1221. Fig. 17 of the magnetic flux density at a first coil.

[0098] In Fig. 17 (a) The cross-sectional area of ​​the second magnet 1223 perpendicular to the direction of vibration of the second membrane 1221 is smaller than the cross-sectional area of ​​the third magnet 1224 perpendicular to the direction of vibration of the second membrane 1221 and is approximately 10% of the cross-sectional area of ​​the third magnet 1224 perpendicular to the direction of vibration of the second membrane 1221. Fig. 17 (b) The cross-sectional area of ​​the second magnet 1223 perpendicular to the direction of vibration of the second membrane 1221 is larger than the cross-sectional area of ​​the third magnet 1224 perpendicular to the direction of vibration of the second membrane 1221 and is approximately four times as large as the cross-sectional area of ​​the third magnet 1224 perpendicular to the direction of vibration of the second membrane 1221. Fig. Equation 18 denotes the ratio of the cross-sectional area of ​​the second magnet 1223, perpendicular to the direction of vibration of the second diaphragm 1221, to the cross-sectional area of ​​the third magnet 1224, perpendicular to the direction of vibration of the second diaphragm 1221, as the abscissa, and the magnetic flux density at the first coil as the ordinate. In a first reference plane perpendicular to the direction of vibration 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 flux density at the first coil also increases.Furthermore, it can be seen that with the increase of the ratio of the cross-sectional area of ​​the second magnet 1223 to the cross-sectional area of ​​the third magnet 1224, a combined magnetic field (such as a resulting magnetic field after coupling a magnetic field generated by the second magnet 1223 with a magnetic field generated by the third magnet 1224) of the second loudspeaker 122 can increasingly increase the magnetic flux density at the first coil, thus increasing the sensitivity of the first loudspeaker 121.

[0099] To increase the sensitivity of the first loudspeaker 121 and simultaneously ensure the acoustic output characteristics of the second loudspeaker 122, some embodiments provide that the ratio of the cross-sectional area of ​​the second magnet 1223 perpendicular to the direction of vibration of the second diaphragm 1221 to the cross-sectional area of ​​the third magnet 1224 perpendicular to the direction of vibration of the second diaphragm 1221 can be between 0.5 and 4. To further increase the sensitivity of the first loudspeaker 121 and simultaneously ensure the acoustic output characteristics of the second loudspeaker 122, some embodiments provide that the ratio of the cross-sectional area of ​​the second magnet 1223 perpendicular to the direction of vibration of the second diaphragm 1221 to the cross-sectional area of ​​the third magnet 1224 perpendicular to the direction of vibration of the second diaphragm 1221 can be between 1 and 2.5.In order to increase the sensitivity of the first loudspeaker 121 and at the same time ensure the acoustic output characteristics of the second loudspeaker 122, in some embodiments it is provided that the ratio of the cross-sectional area of ​​the second magnet 1223 perpendicular to the direction of vibration of the second diaphragm 1221 to the cross-sectional area of ​​the third magnet 1224 perpendicular to the direction of vibration of the second diaphragm 1221 can be between 2 and 3.

[0100] In some embodiments, it is provided that in the first reference plane perpendicular to the direction of vibration of the second diaphragm 1221, the overlapping area of ​​the second magnet 1223 with, for example, the first magnet 1213 of the first magnetic circuit system 1212 is larger than the overlapping area of ​​the third magnet 1224 with, for example, the first magnet 1213 of the first magnetic circuit system 1212. Thus, the area in which the second magnet 1223 influences, for example, the first magnet 1213 of the first magnetic circuit system 1212 can be ensured, which increases the degree of exclusion between the second magnetic circuit system 1222 and the first magnetic circuit system 1212.In some embodiments, the overlapping area of ​​the second magnet 1223 with, for example, the first magnet 1213 of the first magnetic circuit system 1212 is not less than 90% of the area of ​​the second magnet 1223 in the first reference plane of the vibration direction of the second membrane 1221. In some embodiments, the overlapping area of ​​the second magnet 1223 with, for example, the first magnet 1213 of the first magnetic circuit system 1212 is 100% of the area of ​​the second magnet 1223 in the first reference plane perpendicular to the vibration direction of the second membrane 1221.

[0101] See Fig. 19. Fig. Figure 19 shows a schematic structural representation of a second loudspeaker 122 made of Fig. 17 in some other embodiments. The second magnetic circuit system 1222 can include a fourth magnet 1225, which, together with the second magnet 1223, drives the second diaphragm 1221 to produce sound. Because the fourth magnet 1225, together with the second magnet 1223, can drive the second diaphragm 1221 to produce sound, the acoustic performance of the second loudspeaker 122 is enhanced. In some embodiments, the fourth magnet 1225, together with the second magnet 1223 and the third magnet 1224, can drive the second diaphragm 1221 to produce sound, thus enhancing the acoustic performance of the second loudspeaker 122.

[0102] The fourth magnet 1225 can be located on a side of the second diaphragm 1221 facing away from the second magnet 1223. That is, the fourth magnet 1225 and the second magnet 1223 are located on two opposite sides of the second diaphragm 1221. In some embodiments, the magnetic pole on a side of the fourth magnet 1225 facing the second diaphragm 1221 is the same as the magnetic pole on a side of the second magnet 1223 facing the second diaphragm 1221. For example, the magnetic pole on a side of the fourth magnet 1225 facing the second diaphragm 1221 is the N pole, and the magnetic pole on a side of the second magnet 1223 facing the second diaphragm 1221 is the N pole. For example, the magnetic pole on one side of the fourth magnet 1225 facing the second membrane 1221 is S-pole, and the magnetic pole on one side of the second magnet 1223 facing the second membrane 1221 is S-pole.This allows the magnetic flux density at the second coil of the second loudspeaker 122 to be further increased in order to amplify the sound pressure level output by the second loudspeaker 122.

[0103] In some embodiments, the projection from the second loudspeaker 122 in the direction of vibration of the second diaphragm 1221 can fall entirely into the first loudspeaker 121. In some embodiments, the projection from the second loudspeaker 122 in the direction of vibration of the first diaphragm 1211 can fall entirely into the first loudspeaker 121. This ensures the degree of isolation between the first magnetic circuit system 1212 and the second magnetic circuit system 1222, while simultaneously allowing the earphone interior to be more compact and thus increasing space utilization.

[0104] See Fig. 13. In a second reference plane perpendicular to the direction of vibration of the first diaphragm 1211, the first magnetic circuit system 1212 has a long axis direction CZ and a short axis direction DZ, which are orthogonal to each other, wherein the dimension of the first magnetic circuit system 1212 in the long axis CZ direction is larger than the dimension of the first magnetic circuit system 1212 in the short axis DZ direction. In some embodiments, the long axis CZ direction can represent the longitudinal direction Y of the core housing 11, i.e., the direction in which the connecting end CE is spaced from the free end FE. The short axis DZ direction can represent the lateral direction Z of the core housing 11. In some embodiments, the long axis CZ direction can also be arranged intersecting with the longitudinal direction Y of the core housing 11.The direction of the short axis DZ can also be arranged in a cross-direction with the width direction Z of the core housing 11.

[0105] In some embodiments, the second loudspeaker 122 can be arranged centrally relative to the first loudspeaker 121 in the direction of the short axis DZ. In the second reference plane, the first loudspeaker 121 has a center O1 and the second loudspeaker 122 has a center O2. It should be understood that the central arrangement can be defined such that the distance between center O1 and center O2 in the direction of the short axis DZ is no greater than 10% of the dimension of the first loudspeaker 121 in the direction of the short axis DZ. In some embodiments, the distance between center O1 and center O2 in the direction of the short axis DZ is 0.

[0106] See Fig. 13. The axial direction of the second loudspeaker 122 can be parallel to the axial direction of the first loudspeaker 121. This means that the angle between the axial direction of the second loudspeaker 122 and the axial direction of the first loudspeaker 121 can be 0°, and that the relative positions of the first loudspeaker 121 and the second loudspeaker 122 are the same.If the second loudspeaker 122 moves relative to the first loudspeaker 121 in the direction of the long axis CZ of the first loudspeaker 121 and the overlapping area of ​​the second loudspeaker 122 with the first loudspeaker 121 increases from small to large in the axial direction of the first loudspeaker 121, the mutually exclusive force between the second magnetic circuit system 1222 and the first magnetic circuit system 1212 can be gradually increased, so that the sound pressure level of the sound radiated by the first loudspeaker 121 and / or the second loudspeaker 122 is gradually increased.

[0107] See Fig. 20 and Fig. 21. Fig. Figure 20 shows a schematic structural representation during the movement of the in Fig. 13 shown second loudspeaker 122 in the direction of a long axis CZ; and Fig. Figure 21 shows a schematic representation of the influence on the magnetic flux density at the first coil during the movement of the second loudspeaker 122. Fig. 20 in the direction of the long axis CZ. In Fig. Here, 21 denotes the abscissa as the movement distance of the second loudspeaker 122 in the direction of the long axis CZ, and the ordinate as the magnetic flux density at the first coil. The starting point of the movement of the second loudspeaker 122 in the axial direction of the first loudspeaker 121 refers to a position where the projection of the second loudspeaker 122 is closest to the projection of the first loudspeaker 121 and the overlapping area is 0, i.e., the position of the Fig. 20, the second loudspeaker 122 is indicated by a dashed line. The endpoint can refer to a position where the center O1 of the first loudspeaker 121 overlaps with the center O2 of the second loudspeaker 122, i.e., the position of the left center O1 of the in Fig. 20, indicated by a solid line, second loudspeaker 122. With reference to Fig. As can be seen in Figure 21, the magnetic flux density at the first coil increases with increasing distance when the second loudspeaker 122 moves relative to the first loudspeaker 121 in the direction of the long axis CZ of the first loudspeaker 121. It follows that the relative positional relationship between the first loudspeaker 121 and the second loudspeaker 122 in the direction of the long axis CZ influences the magnetic flux density at the first coil of the first loudspeaker 121.As the center O1 of the first loudspeaker 121 and the center O2 of the second loudspeaker 122 gradually approach each other in the direction of the long axis CZ, the overlapping area of ​​the second loudspeaker 122 with the first loudspeaker 121 increases from small to large in the axial direction of the first loudspeaker 121, so that the mutually exclusive force between the second magnetic circuit system 1222 and the first magnetic circuit system 1212 can be gradually increased and thus the sensitivity of the first loudspeaker 121 is increased.

[0108] See Fig. 13. In some embodiments, the distance between the center O1 of the first loudspeaker 121 and the center O2 of the second loudspeaker 122 is not greater than 5 mm in the direction of the long axis CZ. This ensures that the second loudspeaker 122 amplifies the magnetic flux density at the first coil of the first loudspeaker 121 and thus increases the sound pressure level output by the first loudspeaker 121. In some embodiments, the distance between the center O1 of the first loudspeaker 121 and the center O2 of the second loudspeaker 122 is not greater than 4.5 mm in the direction of the long axis CZ.

[0109] See Fig. 13. In some embodiments, the ratio of the distance between the center O1 of the first loudspeaker 121 and the center O2 of the second loudspeaker 122 to the dimension of the first loudspeaker 121 in the direction of the long axis CZ is not greater than 0.3. In some embodiments, the ratio of the distance between the center O1 of the first loudspeaker 121 and the center O2 of the second loudspeaker 122 to the dimension of the first loudspeaker 121 in the direction of the long axis CZ is not greater than 0.25. This ensures that the second loudspeaker 122 amplifies the magnetic flux density at the first coil of the first loudspeaker 121 and thus increases the sound pressure level output by the first loudspeaker 121.

[0110] In some embodiments, the maximum distance between the center O2 of the second loudspeaker 122 and the outer end face RS of the free end FE is not greater than 10 mm in the direction of the long axis CZ. This allows the second loudspeaker 122 to be positioned closer to the free end FE of the core housing 11 when worn (for example, when the free end FE projects into the cavity 2002), so that the sound emitted through the second sound outlet 1102 can be transmitted more effectively to the user's ear canal, thus increasing the listening volume. In some embodiments, the maximum distance between the center O2 of the second loudspeaker 122 and the outer end face RS of the free end FE is not greater than 8 mm in the direction of the long axis CZ.It is to be understood that, with the free end FE as a circular arc surface, a point on the circular arc surface, where the free end FE is furthest away from the connecting end CE in the longitudinal direction Y, is located in a cross-sectional surface perpendicular to the longitudinal direction Y, and the maximum distance between the center O2 and the cross-sectional surface is not greater than 8 mm.

[0111] In some embodiments, the first magnetic circuit system 1212 has a first reference point C1 located closest to the free end FE in the direction of the long axis CZ. The second magnetic circuit system 1222 has a second reference point C2 located closest to the free end FE. The second reference point C2 is located on a side of the first reference point C1 that is farther 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 in order to ensure the degree of exclusion between the second magnetic circuit system 1222 and the first magnetic circuit system 1212 and thus increase the output sound pressure level of the first loudspeaker 121 and the second loudspeaker 122.In some embodiments, it is provided that in the direction of the long axis CZ the maximum distance between the center O2 of the second loudspeaker 122 and a point of the first loudspeaker 121 further away from the second loudspeaker 122 is less than or equal to 5 mm.

[0112] In some other embodiments described above, it is also possible to adjust the axial direction of the second loudspeaker 122 such that the angle between the axial direction of the second loudspeaker 122 and the axial direction of the first loudspeaker 121 can be greater than 0° and less than 90°. It is also possible, for example, for the angle between the axial direction of the second loudspeaker 122 and the axial direction of the first loudspeaker 121 to be equal to 90°. It should be understood that during the adjustment of the axial direction of the second loudspeaker 122, the mutually exclusive force between the second magnetic circuit system 1222 and the first magnetic circuit system 1212 is also adjusted.

[0113] See Fig. 6 and Fig. 7. The main control circuit board 13 can be connected to the second housing 112, for example, by means of a heat-melting pin connected to the top wall 1121, and can partially overlap with the second side wall 1122 in the thickness direction X to help accommodate a sufficiently large first loudspeaker 121 within the core housing 11. This increases the volume of the sound from the earphone 100, i.e., the arrangement is optimized and space utilization is increased. 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 may be the thickness direction X, and, of course, it may also be arranged intersecting the thickness direction X.

[0114] Since the main control circuit board 13 is arranged in the core housing 11, for example by connecting the main control circuit board 13 with, for example, the top wall 1121 of the second housing 112, the main control circuit board 13 can be electrically connected to another electronic element or an external device via elastic metal elements, such as pogo-pin, metal snap disc or the like.

[0115] In some embodiments, the main control circuit board 13 is located on a side of the first loudspeaker 121 close to the second housing 112. In some embodiments, the main control circuit board 13 and the first loudspeaker 121 can be stacked on top of each other in the thickness direction of the main control circuit board 13 or in the axial direction of the first loudspeaker 121. In some embodiments, the main control circuit board 13 can overlap with a portion of the first loudspeaker 121 located near the connection end CE in the axial direction of the first loudspeaker 121 to optimize the arrangement and thus increase space utilization.

[0116] See Fig.14. The main control circuit board 13 can be electrically connected to terminals, such as the first terminal 1301, the second terminal 1302, another terminal, and the like, to control the loudspeaker arrangement 12. In some embodiments, the terminals, such as the first terminal 1301, the second terminal 1302, another terminal, and the like, can be located on the main control circuit board 13.

[0117] A driver circuit 131 can be provided on the main control circuit board 13 to control the loudspeaker arrangement 12, such as the first loudspeaker 121 or the second loudspeaker 122. Furthermore, it is provided that the driver circuit 131 consists primarily of a digital-to-analog conversion circuit 1311 and may, of course, also include a power amplification circuit, a processor, or the like. In particular, it is possible that the driver circuit 131 is formed at least by circuits such as the digital-to-analog conversion circuit 1311 and the like, in accordance with the prior art in this field. This will not be repeated here.

[0118] The driver circuit 131 can be electrically connected to terminals, such as the first terminal 1301, the second terminal 1302, another terminal and the like, in order to electrically connect, for example, the first loudspeaker 121 and the second loudspeaker 122 of the loudspeaker arrangement 12 and thus drive, for example, the first loudspeaker 121 and the second loudspeaker 122 of the loudspeaker arrangement 12.

[0119] In some embodiments, the driver circuit 131 can simultaneously drive the first loudspeaker 121 and the second loudspeaker 122 using a digital-to-analog conversion circuit 1311, thus simplifying the circuit design and reducing costs. That is, the driver circuit 131 can be designed to simultaneously drive the first loudspeaker 121 and the second loudspeaker 122 using the same digital-to-analog conversion circuit 1311. This ensures that the overall sound quality is not affected by the interaction of the first loudspeaker 121 with the second loudspeaker 122, as the high-frequency sound waves generated by the first loudspeaker 121 are effectively augmented by the second loudspeaker 122 after being attenuated by the first resonant frequency of the first front chamber 1201.

[0120] It is understood that the earphone 100 may also include electronic elements to ensure the proper operation of the earphone 100, such as a battery, a sensor, an antenna, and the like. Such electronic elements may be arranged in the core module 10 and / or ear hook 20 as required. This will not be repeated here.

[0121] In the embodiments of the present application, it is understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above serve only for illustration. For instance, the division of modules or units represents only a logical division of functions, whereas other types of division may be used in the actual implementation, such as combining several units or components with one another or integrating them into a further system, or omitting certain features or not implementing them.

[0122] A unit described as a separate element may be physically separate or not physically separate; an element shown as a unit may be a physical unit or not, namely, it may be located in one place or distributed across multiple network units. Some or all of these units may be selected according to actual needs to achieve the purpose of the embodiments presented here.

[0123] Furthermore, all functional units in the individual embodiments of the present application can be integrated into a processing unit, or each unit can exist physically on its own, or two or more than two units can be integrated into one unit. The integrated unit described above can be implemented either as a hardware or a software functional unit.

[0124] The above-mentioned are only embodiments of the present application and do not limit the scope of the present application, and any equivalent structure or equivalent process transformation carried out using the content of the description and drawings of the present application is used either directly or indirectly in other related technical fields, each of which is likewise included in the scope of protection of the present application.

Claims

[1] Earphone, wherein the earphone comprises a first loudspeaker and a second loudspeaker, wherein the frequency band of the sound emitted by the first loudspeaker is at least partially lower than the frequency band of the sound emitted by the second loudspeaker, wherein the first loudspeaker comprises a first diaphragm and a first magnetic circuit system for driving the first diaphragm to generate sound and the second loudspeaker comprises a second diaphragm and a second magnetic circuit system for driving the second diaphragm to generate sound, wherein a projection of the first magnetic circuit system in a direction of vibration of the first diaphragm is arranged to overlap at least partially with the second magnetic circuit system, and wherein the second magnetic circuit system and the first magnetic circuit system are arranged to be mutually exclusive. [2] Earphone according to claim 1, wherein the earphone further comprises a core module and an ear hook connected to the core module. [3] Earphone according to claim 1 or 2, wherein the core module is arranged such that it does not block the external auditory canal when worn. [4] Earphone according to any one of claims 1 to 3, wherein the core module comprises a core housing, a loudspeaker arrangement and a main control circuit board. [5] Earphone according to any one of claims 1 to 4, wherein the loudspeaker arrangement comprises the first loudspeaker and the second loudspeaker arranged in the core housing. [6] Earphone according to any one of claims 1 to 5, wherein a projection of the second magnetic circuit system in a direction of oscillation of the second diaphragm is arranged to be at least partially overlapping with the first magnetic circuit system. [7] Earphone according to any one of claims 1 to 6, wherein the overlapping area of ​​the second magnet with the first magnet is not less than 90% of the area of ​​the second magnet. [8] Earphone according to any one of claims 1 to 7, wherein in a second reference plane perpendicular to the direction of vibration of the first diaphragm the first magnetic circuit system has a direction of a long axis and a direction of a short axis which are orthogonal to each other, wherein the dimension of the first magnetic circuit system in the direction of the long axis is larger than the dimension of the first magnetic circuit system in the direction of the short axis, and wherein the second loudspeaker is arranged centrally relative to the first loudspeaker in the direction of the short axis. [9] Earphone according to claim 8, wherein in the direction of the long axis the distance between the center of the first loudspeaker and the center of the second loudspeaker is not greater than 5 mm. [10] Earphone according to claim 9, wherein the core housing is connected to the ear hook, wherein the core housing has a connecting end connected to the ear hook and a free end further away from the ear hook, wherein the core housing is located at the front of the ear when worn and the free end projects into or covers the cavum conchae, wherein the direction of the long axis is in a direction in which the connecting end is spaced away from the free end, and wherein the second loudspeaker is arranged near the free end. [11] Earphone according to claim 10, wherein the free end projects into the cave conchae when worn, and wherein, in the direction of the long axis, the maximum distance between the center of the second loudspeaker and an outer end face of the free end is not greater than 10 mm. [12] Earphone according to any one of claims 1 to 11, wherein a projection of the second loudspeaker in the direction of vibration of the second diaphragm falls as a whole into the first loudspeaker. [13] Earphone according to any one of claims 1 to 12, wherein the core housing in the worn state has, in the thickness direction, an inner side facing the ear, an outer side facing away from the ear and a connecting surface connecting the inner side with the outer side. [14] Earphone according to any one of claims 1 to 13, wherein the inside is provided with a first sound outlet opening, and wherein sound waves generated by the first loudspeaker are propagated through the first sound outlet opening. [15] Earphone according to any one of claims 1 to 14, wherein the inside is provided with a projection extending in the thickness direction, and wherein the first sound outlet opening is provided on the projection. [16] Earphone according to any one of claims 1 to 15, wherein the exclusion level between the second magnetic circuit system and the first magnetic circuit system is arranged such that the sound pressure level of the first loudspeaker and / or the second loudspeaker is increased by at least 1 dB compared to the sound pressure level of the first loudspeaker or the second loudspeaker during individual operation. [17] Earphone according to any one of claims 1 to 16, wherein the first magnetic circuit system comprises a first magnet and a magnetically conductive cover arranged surrounding the first magnet, wherein the second magnetic circuit system comprises a second magnet and a third magnet arranged surrounding the second magnet, wherein the magnetic poles of the second magnet and the third magnet are oriented oppositely to each other in the direction of vibration of the second diaphragm, wherein in a first reference plane perpendicular to the direction of vibration of the second diaphragm the area of ​​the second magnet is larger than the area of ​​the third magnet and the overlapping area of ​​the second magnet with the first magnet is larger than the overlapping area of ​​the third magnet with the first magnet, and wherein the magnetic poles of the first magnet and the second magnet are arranged in a mutually exclusive manner.

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