Electroacoustic transducer and headphones

Abstract

This disclosure provides an electroacoustic transducer and headphones, the electroacoustic transducer having a hollow passage that penetrates along its axial direction, the electroacoustic transducer comprising a vibration system and a magnetic circuit system, the vibration system comprising a diaphragm, a first voice coil and a second voice coil, the diaphragm surrounding the hollow passage, the first voice coil connected to the diaphragm and surrounding the hollow passage, the second voice coil connected to the diaphragm and surrounding the outer circumference of the first voice coil, and the magnetic circuit system driving the motion of the first voice coil and the second voice coil to vibrate the diaphragm and generate sound. By adopting a method of installing a hollow passage in the electroacoustic transducer, the length of the path through which airflow or sound flows through the housing of the headphones can be reduced to the greatest extent possible, and the breathability of the headphones can be effectively improved. Furthermore, by installing the first voice coil and the second voice coil, when the electroacoustic transducer is operating, the two voice coils operate simultaneously, providing a greater driving force to the diaphragm, effectively improving the performance of the product and enhancing the high-frequency effect.

Description

Technical Field

[0001] This disclosure claims the priority of a Chinese patent publication filed with the Chinese Patent Office on June 20, 2024, with an application number of 202421430921.7 and a publication title of "Electroacoustic Transducer and Headphone", and incorporates all of its content into this disclosure by reference.

[0002] This disclosure claims the priority of a Chinese patent publication filed with the Chinese Patent Office on June 20, 2024, with an application number of 202421430143.1 and a publication title of "Headphone", and incorporates all of its content into this disclosure by reference.

[0003] This disclosure claims the priority of a Chinese patent publication filed with the Chinese Patent Office on June 20, 2024, with an application number of 202421430910.9 and a publication title of "Headphone", and incorporates all of its content into this disclosure by reference.

[0004] This disclosure claims the priority of a Chinese patent publication filed with the Chinese Patent Office on June 20, 2024, with an application number of 202410808541.0 and a publication title of "Headphone", and incorporates all of its content into this disclosure by reference.

[0005] Embodiments of this disclosure relate to the technical field of wearable devices, particularly to electroacoustic transducers and headphones.

Background Art

[0006] An electroacoustic transducer such as a speaker or a loudspeaker may be a device that realizes converting an acoustic signal into sound for playback, so electroacoustic transducers are widely applied to headphones.

[0007] In related technologies, relatively small speakers are used in headphones to improve comfort and breathability. However, in related technologies, the sound generation effect of relatively small speakers is not ideal, and the improvement in headphone breathability is limited, making it difficult to effectively improve the user's listening experience. [Overview of the project]

[0008] In light of the above issues, embodiments of this disclosure provide an electroacoustic transducer and headphones that can effectively improve the user's listening experience.

[0009] To achieve the above objectives, the embodiments of this disclosure provide the following technical solutions.

[0010] A first embodiment of the embodiments of the present disclosure has a hollow passage that penetrates along its own axial direction and comprises a vibration system and a magnetic circuit system, The vibration system comprises a diaphragm surrounding the hollow passage, a first voice coil connected to the diaphragm and surrounding the hollow passage, and a second voice coil connected to the diaphragm and surrounding the outer circumference of the first voice coil. The magnetic circuit system provides an electroacoustic transducer having a magnetic gap, with at least a portion of the first voice coil and at least a portion of the second voice coil located within the magnetic gap, and the magnetic circuit system drives the motion of the first voice coil and the second voice coil to vibrate the diaphragm and generate sound.

[0011] A second embodiment of the present disclosure provides headphones comprising a housing and an electroacoustic transducer as described in the first embodiment, wherein the electroacoustic transducer is installed in the housing.

[0012] A third embodiment of the present disclosure comprises a housing, an electroacoustic transducer, and an opening / closing assembly, wherein the electroacoustic transducer is installed within the housing, the electroacoustic transducer has a hollow passage that penetrates it along its axial direction, the housing has a first acoustic output hole, the first acoustic output hole is located on the side of the housing facing the ear portion, the hollow passage communicates with the first acoustic output hole, the housing further comprises an outer wall installed opposite the electroacoustic transducer, the outer wall has an end face hole, the end face hole communicates with the hollow passage and the external environment, The opening and closing assembly provides headphones that switch the communication between the first acoustic output port and the external environment on and off.

[0013] A fourth embodiment of the present disclosure comprises a housing and an electroacoustic transducer, wherein the electroacoustic transducer is installed within the housing, and the electroacoustic transducer is provided with a hollow passage that penetrates it along its axial direction. The housing has a first acoustic output hole and an end face hole, the first acoustic output hole being located on the side of the housing facing the ear portion, the first acoustic output hole communicating with the hollow passage, and the end face hole being located on the side of the housing opposite the ear portion, and communicating with the external environment and the hollow passage, respectively. A first resonant cavity is formed on the side of the headphones facing the ear portion, the first resonant cavity communicates with the first acoustic output hole, and when the headphones are worn, the first resonant cavity is covered over the ear portion, and the first resonant cavity communicates with the end face hole by the hollow passage such that the first resonant cavity, the hollow passage and the end face hole form a first Helmholtz resonant system. A second resonant cavity is further formed within the housing, having a second acoustic output port on the side opposite to the ear portion of the housing, the second resonant cavity communicating the rear tuning port of the electroacoustic transducer with the second acoustic output port, and the second resonant cavity and the second acoustic output port form a second Helmholtz resonant system. The end face hole and the second acoustic output hole constitute a dual-pole sound source within a predetermined frequency range, providing headphones.

[0014] In the electroacoustic transducer and headphones provided by the embodiments of this disclosure, a hollow passage is installed in the electroacoustic transducer. As a result, when the electroacoustic transducer is attached to the headphone housing, it can work in cooperation with the headphone housing to provide an open listening environment to the ears. The user can listen to music while also hearing external sounds, satisfying the user's different listening needs. Furthermore, heat inside the headphones can be released, keeping the ears comfortable. By adopting a method of installing a hollow passage in the electroacoustic transducer, the length of the path through which airflow or sound flows through the headphone housing can be reduced to the greatest extent possible, effectively improving the breathability of the headphones. In addition, by installing a first voice coil and a second voice coil, when the electroacoustic transducer is operating, the two voice coils operate simultaneously, providing a greater driving force to the diaphragm, effectively improving the performance of the product and enhancing the high-frequency effect.

[0015] In addition to the technical problems solved by the embodiments of this disclosure described above, the technical features constituting the technical solutions, and the beneficial effects resulting from these technical features, other technical problems that the electroacoustic converters and headphones provided by the embodiments of this disclosure can solve, other technical features included in the technical solutions, and the beneficial effects resulting from these technical features will be described in more detail in specific embodiments. [Brief explanation of the drawing]

[0016] To more clearly illustrate the embodiments of this disclosure or the technical solutions of the prior art, the drawings necessary for describing the embodiments or the prior art will be briefly described below. However, it is clear that the drawings described below represent only a few embodiments of this disclosure, and those skilled in the art can obtain further drawings based on these drawings without requiring any creative effort. [Figure 1]It is a structural schematic diagram of an electroacoustic transducer provided by an embodiment of the present disclosure. [Figure 2] It is a cross-sectional view of the electroacoustic transducer shown in FIG. 1. [Figure 3] It is a cross-sectional view of a headset provided by an embodiment of the present disclosure. [Figure 4] It is a first structural schematic diagram when an opening / closing assembly of an electroacoustic transducer provided by an embodiment of the present disclosure is attached. [Figure 5] It is a second structural schematic diagram when an opening / closing assembly of an electroacoustic transducer provided by an embodiment of the present disclosure is attached. [Figure 6] It is a perspective view of a headset provided by an embodiment of the present disclosure in a sealed state. [[ID=1~7]] [Figure 7] It is a perspective view of a headset provided by an embodiment of the present disclosure in an open state. [Figure 8] It is a structural schematic diagram of a diaphragm, a first voice coil and a second voice coil provided by an embodiment of the present disclosure. [Figure 9] It is a first exploded schematic diagram of an electroacoustic transducer provided by an embodiment of the present disclosure. [Figure 10] It is a cross-sectional view of an electroacoustic transducer provided by another embodiment of the present disclosure. [Figure 11] It is a second exploded schematic diagram of an electroacoustic transducer provided by an embodiment of the present disclosure. [Figure 12] It is a structural schematic diagram of an ear part. [Figure 13] It is a structural schematic diagram from a first perspective when a headset is worn on an ear part in the related art. [Figure 14] It is a structural schematic diagram from a second perspective when a headset is worn on an ear part in the related art. [Figure 15] It is a first cross-sectional structural diagram when a headset provided by an embodiment of the present disclosure is worn on an ear part. [Figure 16] It is a second cross-sectional structural diagram when a headset provided by an embodiment of the present disclosure is worn on an ear part. [Figure 17]It is a projection schematic diagram along the coronal axis direction on the second reference plane H of the hollow passage, ear hole, and end face hole provided by an embodiment of the present disclosure. [Figure 18] It is a perspective view of the headphones in the open state provided by an embodiment of the present disclosure. [Figure 19] It is a perspective view of the headphones in the closed state provided by an embodiment of the present disclosure. [Figure 20] It is a third cross-sectional structure diagram when the headphones provided by an embodiment of the present disclosure are worn on the ear. [Figure 21] It is a fourth cross-sectional structure diagram when the headphones provided by an embodiment of the present disclosure are worn on the ear. [Figure 22] It is a fifth cross-sectional structure diagram when the headphones provided by an embodiment of the present disclosure are worn on the ear. [Figure 23] It is a sixth cross-sectional structure diagram when the headphones provided by an embodiment of the present disclosure are worn on the ear. [Figure 24] It is a perspective view of the headphones in the open state of an embodiment of the present disclosure. [Figure 25] It is one of the cross-sectional views of the headphones provided by an embodiment of the present disclosure. [Figure 26] It is a frequency response curve diagram of the sound emitted by the end face hole with unadjusted parameters and a frequency response curve diagram of the sound emitted by the second acoustic output hole provided by this embodiment. [Figure 27] It is a frequency response curve diagram of the sound emitted by the end face hole after the parameters are adjusted and a frequency response curve diagram of the sound emitted by the second acoustic output hole provided by this embodiment. [Figure 28] It is two of the cross-sectional views of the headphones provided by an embodiment of the present disclosure. [Figure 29] It is three of the cross-sectional views of the headphones provided by an embodiment of the present disclosure. [Figure 30] It is four of the cross-sectional views of the headphones provided by an embodiment of the present disclosure. [Figure 31] It is a perspective view of the headphones in the closed state of an embodiment of the present disclosure. [Figure 32]This is a cross-sectional view of headphones provided in the embodiment of the present disclosure. [Figure 33] This is a schematic diagram of a plastic supporter provided in an embodiment of the present disclosure. [Modes for carrying out the invention]

[0017] Example 1 The present disclosure will be described in detail below with reference to the examples.

[0018] As is already understood, the electroacoustic transducer of this disclosure is applied to electronic devices, for example, which may be electronic devices that provide acoustic input by being close to or inserted into a person's ear canal, such as headphones or wearable devices. If the electronic device is headphones, the headphones may be wired headphones, true wireless stereo (TWS) headphones, or open-back stereo (OWS) headphones. Exemplarily, this disclosure describes the electroacoustic transducer as over-ear headphones, where, when worn on the ear, the over-ear headphones cover the ear and cover the entire ear within a cavity formed by the headphones and the head.

[0019] Furthermore, in related technologies, headphones typically employ relatively small speakers to improve comfort and breathability. However, in related technologies, relatively small speakers do not produce ideal sound, and the improvement in headphone breathability is limited, making it difficult to effectively improve the user's listening experience.

[0020] Referring to Figures 1 and 2, Figure 1 is a schematic diagram of the structure of an electroacoustic transducer provided in an embodiment of the present disclosure, and Figure 2 is a cross-sectional view of the electroacoustic transducer shown in Figure 1. An embodiment of the present disclosure provides an electroacoustic transducer 20 having a hollow passage 21 that penetrates along its axial direction, the electroacoustic transducer 20 comprising a vibration system 22 and a magnetic circuit system 23, the vibration system 22 comprising a diaphragm 221, a first voice coil 222 and a second voice coil 223, the diaphragm 221 surrounding the hollow passage 21, the first voice coil 222 connected to the diaphragm 221 and surrounding the hollow passage 21, and the second voice coil 223 connected to the diaphragm 221 and surrounding the outer circumference of the first voice coil 222.

[0021] The magnetic circuit system 23 has a magnetic gap, and at least a portion of the first voice coil 222 and at least a portion of the second voice coil 223 are located in the magnetic gap. The magnetic circuit system 23 drives the motion of the first voice coil 222 and the second voice coil 223 to vibrate the diaphragm 221 and generate sound.

[0022] As is already understood, the electroacoustic transducer 20 is equipped with a hollow passage 21 that penetrates it, so in this case the electroacoustic transducer 20 takes on a nearly ring-shaped structure.

[0023] To further understand, referring to Figure 3, which is a cross-sectional view of headphones provided in an embodiment of the present disclosure. The electroacoustic transducer 20 of the present disclosure may be installed in the housing 10 of headphones 100, where the housing 10 of headphones 100 is provided with an end face hole 121 that communicates with the external environment, and the housing 10 of headphones 100 has a first acoustic output hole 11, the first acoustic output hole 11 located on the side of the housing 10 facing the ear portion 200. When the electroacoustic transducer 20 is installed in the housing 10, the hollow passage 21 of the electroacoustic transducer 20 communicates with the first acoustic output hole 11 and the end face hole 121. As already understood, when headphones 100 are worn on the ear portion 200, the sound signal emitted by the electroacoustic transducer 20 is transmitted to the ear canal of a person through the first acoustic output hole 11 and then enters the ear canal.

[0024] Exemplary, the housing 10 includes an outer wall 12, and the outer wall 12 and the electroacoustic transducer 20 are installed facing each other in the axial direction of the electroacoustic transducer 20. An end face hole 121 is provided in the outer wall 12, and the end face hole 121 communicates the hollow passage 21 with the external environment. In this way, the first acoustic output hole 11 communicates with the hollow passage 21, so that the first acoustic output hole 11 can communicate with the external environment through the hollow passage 21 and the end face hole 121, thereby enabling the conduction of airflow and the transmission of sound.

[0025] As is already understood, the electroacoustic transducer 20 provided in the embodiments of this disclosure is provided with a hollow passage 21 that communicates with the first acoustic output hole 11, and after the electroacoustic transducer 20 is attached to the housing 10 of the headphones 100, the hollow passage 21 of the electroacoustic transducer 20 communicates with the end face hole 121 on the housing 10 of the headphones 100, and the first acoustic output hole 11 communicates with the end face hole 121 by the hollow passage 21, thereby enabling communication between the first acoustic output hole 11 and the external environment, and furthermore, it can provide an open listening environment for the ear portion 200, so that the user can hear external sounds while listening to music, satisfying the user's different listening requirements, and also releasing heat from inside the headphones 100 to keep the ear portion 200 in a comfortable state.

[0026] Furthermore, by adopting a method of installing a hollow passage 21 in the electroacoustic transducer 20, the length of the path through which airflow or sound flows between the first acoustic output hole 11 and the end face hole 121 can be reduced to the maximum extent, effectively improving the breathability of the headphones 100. In addition, by installing the end face hole 121 in the outer wall 12 which is installed opposite the electroacoustic transducer 20, the distance between the end face hole 121 and the hollow passage 21 can be further reduced, further decreasing the length of the path through which airflow or sound flows between the first acoustic output hole 11 and the end face hole 121, thereby further improving the breathability of the headphones 100.

[0027] Furthermore, by installing the first voice coil 222 and the second voice coil 223, when the electroacoustic transducer 20 is in operation, the two voice coils operate simultaneously, providing a greater driving force to the diaphragm 221, effectively improving the performance of the product and enhancing the high-frequency effect.

[0028] To realize the function of opening or closing the hollow passage 21, we now refer to Figures 4 and 5. Figure 4 is a first schematic diagram of the structure when the opening / closing assembly of the electroacoustic transducer provided in an embodiment of the present disclosure is installed, and Figure 5 is a second schematic diagram of the structure when the opening / closing assembly of the electroacoustic transducer provided in an embodiment of the present disclosure is installed. As can be seen, the opening / closing assembly in Figure 4 is in the open state, and the opening / closing assembly in Figure 5 is in the closed state. The electroacoustic transducer 20 may further comprise an opening / closing assembly 30, which is installed in the hollow passage 21 and opens or closes the hollow passage 21.

[0029] As is already understood, when the opening / closing assembly 30 is in a sealed state, the hollow passage 21 is sealed and does not communicate with the first acoustic output hole 11 and the end face hole 121, thus providing a sealed listening environment to the ear portion 200 and satisfying the user's need for an immersive experience. When the opening / closing assembly 30 is in an open state, the hollow passage 21 is open and the first acoustic output hole 11 communicates with the end face hole 121 through the hollow passage 21, thereby enabling communication between the first acoustic output hole 11 and the external environment, providing an open listening environment to the ear portion 200, allowing the user to hear external sounds while listening to music, satisfying the user's different listening needs, and also releasing heat from inside the headphones 100 and keeping the ear portion 200 comfortable.

[0030] To further understand, the shapes of the first acoustic output hole 11 and the end face hole 121 may be circular, but are not limited to circular, and may further include, for example, one or more of elliptical, coarse, triangular, rectangular, polygonal, or other complex shapes having an ornamental nature, and the disclosure is not limited herein.

[0031] Here, in order to improve the ventilation of the headphones 100, the sizes of the first acoustic output hole 11, the end face hole 121, and the hollow passage 21 may be made as large as possible. In other words, the larger the cross-sectional area of ​​the first acoustic output hole 11, the end face hole 121, and the hollow passage 21, the better the ventilation of the headphones 100.

[0032] For example, the minimum cross-sectional area of ​​the first acoustic output hole 11 is 15 square millimeters or more. In this way, the breathability of the headphones 100 can be effectively improved, and the quality of sound transmission can also be improved. More preferably, the minimum cross-sectional area of ​​the first acoustic output hole 11 is 25 square millimeters or more, and even more preferably, the minimum cross-sectional area of ​​the first acoustic output hole 11 is 40 square millimeters or more.

[0033] The opening / closing assembly 30 is used primarily for opening or closing the hollow passage 21, and its structure is not specifically limited in this disclosure; it is sufficient as long as it can open or close the hollow passage 21. For example, the opening / closing assembly 30 may be a shutter assembly similar to a "shutter" structure, and the shutter assembly may include a plurality of blades, the plurality of blades being able to move along the radial direction of the hollow passage 21, the plurality of blades being able to achieve a sealing function by moving closer to each other, and the plurality of blades being able to achieve an opening function by moving further apart from each other. Exemplary, a perspective view of the headphones 100 in a sealed state is shown in Figure 6, and a perspective view of the headphones 100 in an open state is shown in Figure 7.

[0034] In some embodiments, when the electroacoustic transducer 20 is attached to the housing 10 of the headphones 100, the opening / closing assembly 30 of the electroacoustic transducer 20 may be connected to a transport mechanism (not shown) installed in the housing 10, with one end of the transport structure located outside the housing 10 and the other end of the transport mechanism connected to the opening / closing assembly 30, for example, to a vane of the opening / closing assembly 30, and the user can activate the opening or closing of the opening / closing assembly 30 by driving the movement of the transport mechanism, thereby switching between the open and closed states of the headphones 100.

[0035] In some other embodiments, the transport mechanism may be connected to an electric motor that drives the movement of the transport mechanism to open or close the opening / closing assembly 30, and the electric motor can control the opening or closing of the opening / closing assembly 30 by receiving commands issued by the main control chip of the headphones 100.

[0036] In several other embodiments, the opening / closing assembly 30 is positioned opposite the communication area of ​​the first acoustic output hole 11, the hollow passage 21, and the end face hole 121, and can switch the communication between the first acoustic output hole 11 and the external environment on and off.

[0037] Here, according to the above limitation, the opening / closing assembly 30 is installed in the hollow passage 21 of the electroacoustic transducer 20, and opens or closes the hollow passage 21. As can be understood, when the opening / closing assembly 30 is in a closed state, the first acoustic output hole 11 and the end face hole 121 are not in communication. When the opening / closing assembly 30 is in an open state, the first acoustic output hole 11 can communicate with the end face hole 121 through the hollow passage 21, thereby enabling communication between the first acoustic output hole 11 and the external environment.

[0038] Alternatively, the opening / closing assembly 30 may be further installed in the housing 10. For example, the opening / closing assembly 30 may be installed on one side of the first acoustic output hole 11 to open or close the first acoustic output hole 11. In this way, the opening and closing of the first acoustic output hole 11 can be switched on / off to enable communication between the first acoustic output hole 11 and the external environment. Also, for example, the opening / closing assembly 30 may be installed on one side of the end face hole 121 to open or close the end face hole 121, and in this way, the opening and closing of the end face hole 121 can be switched on / off to enable communication between the first acoustic output hole 11 and the external environment.

[0039] To more clearly explain the specific structure of the electroacoustic transducer 20, the specific structure of the electroacoustic transducer 20 will be described in detail below with reference to the drawings.

[0040] As can be understood, the diaphragm 221 is the main sound-generating member of the electroacoustic transducer 20. Referring to Figure 8 and combining it with Figure 2, Figure 8 is a schematic diagram of the structure of the diaphragm, first voice coil and second voice coil provided in an embodiment of the present disclosure. The diaphragm 221 comprises an inner surround 2211, a first flat section 2212, a projection dome 2213, a second flat section 2214 and an outer surround 2215, which are connected in sequence. The inner surround 2211 surrounds the hollow passage 21, and the inner surround 2211, projection dome 2213 and outer surround 2215 all protrude outward from the same side of the first flat section 2212. As can be understood, the inner surround 2211, first flat section 2212, projection dome 2213, second flat section 2214 and outer surround 2215 are all ring-shaped. The first voice coil 222 is connected to the first flat section 2212, and the second voice coil 223 is connected to the second flat section 2214. As can be understood, the first voice coil 222 and the second voice coil 223 have a ring-shaped structure. Here, the inner surround 2211, the projection dome 2213, and the outer surround 2215 all protrude outward from the same side of the first flat section 2212, which can also be understood as the inner surround 2211, the projection dome 2213, and the outer surround 2215 all protruding from the same side of the first flat section 2212, and the direction of protrusion is opposite to the first voice coil 222 of the first flat section 2212. In other words, the projection structure formed by the inner surround 2211, the projection dome 2213, and the outer surround 2215 and the first voice coil 222 are located on both sides of the first flat section 2212.

[0041] In this disclosure, by installing the first flat portion 2212 and the second flat portion 2214, the first voice coil 222 and the second voice coil 223 are fixed in place. Furthermore, by bending the diaphragm 221 to form a structure in which the inner surround 2211, the projection dome 2213, and the outer surround 2215 protrude outward from the same side of the first flat portion 2212, when the diaphragm 221 vibrates, the three components cooperate with each other, preventing excessive restraint of the diaphragm 221, and effectively ensuring the vibration effect of the diaphragm 221, thereby improving sound quality.

[0042] Here, for the sake of understanding, a first reference plane perpendicular to the axial direction of the electroacoustic transducer 20 may be created, and in some embodiments, the ratio of the orthographic area of ​​the projection dome 2213 on the first reference plane to the orthographic area of ​​the entire diaphragm 221 on the first reference plane is between 0.2 and 0.7. For example, if the ratio of the orthographic area of ​​the projection dome 2213 on the first reference plane to the orthographic area of ​​the entire diaphragm 221 on the first reference plane is 0.2, 0.5, or 0.7, the high-frequency effect of the electroacoustic transducer 20 can be effectively improved.

[0043] Here, the inner surround 2211, the protruding dome 2213, and the outer surround 2215 may have the same protruding height relative to the first flat portion 2212. Alternatively, the protruding heights of the three may be different. For example, the protruding height of the protruding dome 2213 relative to the first flat portion 2212 may be greater than the protruding heights of the inner surround 2211 and the outer surround 2215 relative to the first flat portion 2212. In this way, the high-frequency sound output effect of the headphones 100 on which the electroacoustic transducer 20 is installed can be improved.

[0044] Furthermore, this disclosure allows for the installation of inner surround 2211 and outer surround 2215 in combination, taking into consideration the low-frequency sound output effect of the headphones 100 on which the electroacoustic converter 20 is installed, thereby improving the sound output effect of the headphones 100 in multiple dimensions.

[0045] In some other embodiments, the inner surround 2211, the projection dome 2213, and the outer surround 2215 may further project in different directions relative to the first flat portion 2212. For example, the projection dome 2213 may project toward the magnetic circuit system 23 relative to the first flat portion 2212, while the inner surround 2211 and outer surround 2215 may project toward the magnetic circuit system 23 relative to the first flat portion 2212. Furthermore, for example, the projection dome 2213 may project toward the magnetic circuit system 23 relative to the first flat portion 2212, while the inner surround 2211 and outer surround 2215 may project toward the magnetic circuit system 23 relative to the first flat portion 2212. In this way, the flexibility of the diaphragm structure 221 is improved, and it can be applied to headphones 100 with different structures.

[0046] Selectively, referring to Figure 2, the inner surround 2211, the projection dome 2213, and the outer surround 2215, and the first voice coil 222 and the second voice coil 223 are located on different sides of the first flat section 2212. Specifically, the inner surround 2211, the projection dome 2213, and the outer surround 2215 are located on the side of the first flat section 2212 opposite to the magnetic circuit system 23. In this way, when the inner surround 2211, the projection dome 2213, and the outer surround 2215 vibrate, interference with the magnetic circuit system 23 is avoided, and the vibration effects of all three can be ensured. Furthermore, the first voice coil 222 and the second voice coil 223 are located on the side of the first flat section 2212 closer to the magnetic circuit system 23. In this way, the magnetic circuit system 23 is closer to the first voice coil 222 and the second voice coil 223, and the magnetic field generated by the magnetic circuit system 23 acts better on both, allowing their motions to be synchronized.

[0047] Here, in order to further improve the high-frequency effect of the electroacoustic transducer 20, the protruding dome 2213 may be an arc-shaped structure or a planar structure that protrudes outward.

[0048] As can be understood, when the projection dome 2213 vibrates, the high-frequency effect is related to the thickness of the material of the projection dome 2213 itself. If the thickness is too large or too small, it will affect the high-frequency effect. Based on this, in the embodiments of the present disclosure, the thickness of the projection dome 2213 is set to between 30 micrometers and 70 micrometers. For example, the thickness of the projection dome 2213 may be 30 micrometers, 50 micrometers, or 70 micrometers, in such a way that the high-frequency effect of the projection dome 2213 is not greatly affected.

[0049] To further understand the high-frequency effects of the electroacoustic transducer 20, the structure of the outer surround 2215 and inner surround 2211 is also relevant.

[0050] Based on this, in the embodiments of the present disclosure, the outer surround 2215 may be installed such that the ratio of the orthographic projection area of ​​the outer surround 2215 on the first reference plane to the orthographic projection area of ​​the entire diaphragm 221 on the first reference plane is between 0.2 and 0.35. For example, the ratio of the orthographic projection area of ​​the outer surround 2215 on the first reference plane to the orthographic projection area of ​​the entire diaphragm 221 on the first reference plane may be 0.2, 0.25, or 0.35, thereby effectively improving the high-frequency effect of the electroacoustic transducer 20. Here, the ratio of the orthographic projection area of ​​the outer surround 2215 on the first reference plane to the orthographic projection area of ​​the entire diaphragm 221 on the first reference plane may be set to be as large as possible, which is advantageous for reducing the resonant frequency and improving low-frequency sound quality.

[0051] To further understand, when the outer surround 2215 vibrates, the high-frequency effect is related to the thickness of the material of the outer surround 2215 itself. If the thickness is too large or too small, it will affect the high-frequency effect. Based on this, in the embodiments of the present disclosure, the thickness of the outer surround 2215 is set between 35 micrometers and 80 micrometers. For example, the thickness of the outer surround 2215 may be 35 micrometers, 55 micrometers, or 80 micrometers, in such a way that the high-frequency effect of the outer surround 2215 is not significantly affected.

[0052] In the embodiments of this disclosure, the inner surround 2211 may be installed such that the ratio of the orthographic projection area of ​​the inner surround 2211 on the first reference plane to the orthographic projection area of ​​the entire diaphragm 221 on the first reference plane is between 0.1 and 0.2. For example, setting the ratio of the orthographic projection area of ​​the inner surround 2211 on the first reference plane to the orthographic projection area of ​​the entire diaphragm 221 on the first reference plane to 0.1, 0.15, or 0.2 can effectively improve the high-frequency effect of the electroacoustic transducer 20.

[0053] As can be understood, when the inner surround 2211 vibrates, the high-frequency effect is related to the thickness of the material of the inner surround 2211 itself. If the thickness is too large or too small, it will affect the high-frequency effect. Based on this, in the embodiments of the present disclosure, the thickness of the inner surround 2211 may be between 35 micrometers and 80 micrometers. For example, the thickness of the inner surround 2211 may be 35 micrometers, 55 micrometers, or 80 micrometers, in such a way that the high-frequency effect of the inner surround 2211 is not greatly affected.

[0054] Here, the inner surround 2211 is an arc-shaped structure that protrudes outward, and the outer surround 2215 is an arc-shaped structure that protrudes outward. In this way, when the diaphragm 221 vibrates, the inner surround 2211, the protruding dome 2213, and the outer surround 2215 cooperate with each other, preventing excessive restraint of the diaphragm 221, and further effectively ensuring the vibration effect of the diaphragm 221, thereby improving sound quality.

[0055] Here, a patterned structure may be provided on one or both of the inner surround 2211 and the outer surround 2215. As can be seen, the patterned structure can form a reinforcing rib structure, which can strengthen the rigidity of the diaphragm 221 and reduce the deformation when the diaphragm 221 vibrates, thereby reducing distortion in the low-frequency band.

[0056] To be understood, by combining Figures 1 and 2 with reference to Figure 9, the diaphragm 221 is fixed, and Figure 9 is a first exploded schematic diagram of an electroacoustic transducer provided by an embodiment of the present disclosure. The electroacoustic transducer 20 further comprises a frame 24, the frame 24 including a ring-shaped inner frame wall 241 and a ring-shaped outer frame wall 242, the inner frame wall 241 regulating the hollow passage 21 and the outer frame wall 242 surrounding the inner frame wall 241.

[0057] To further clarify, the frame 24 may be made of one or more of the following materials: metal, plastic, or resin.

[0058] Here, as shown in Figures 1, 2, and 8, the diaphragm 221 further comprises a first connecting portion 2216 and a second connecting portion 2217, the first connecting portion 2216 being connected to the inner surround 2211 and surrounding the hollow passage 21, and the second connecting portion 2217 surrounding and connecting the outer surround 2215. As can be understood, both the first connecting portion 2216 and the second connecting portion 2217 are ring-shaped structures, the first connecting portion 2216 being connected to the inner wall 241 of the frame, and the second connecting portion 2217 being connected to the outer wall 242 of the frame. In this way, the diaphragm 221 can be fixedly connected to the frame 24.

[0059] As can be understood, since the inner wall of the frame 24 restricts the hollow passage 21, the diameter of the inner wall 241 of the frame determines the cross-sectional area of ​​the hollow passage 21. The larger the cross-sectional area of ​​the hollow passage 21, the better the ventilation of the electroacoustic transducer 20. Based on this, in some embodiments, as shown in Figure 2, the ratio of the minimum diameter D2 of the inner wall 241 of the frame to the maximum diameter D1 of the outer wall 242 of the frame is set to between 0.1 and 0.5. In this way, when the size of the frame 24 itself is fixed, the diameter of the inner wall 241 of the frame can be increased as much as possible without significantly reducing the strength of the frame 24, that is, the cross-sectional area of ​​the hollow passage 21 can be increased as much as possible, thereby improving the ventilation of the electroacoustic transducer 20.

[0060] Selectively, the ratio of the minimum diameter D2 of the inner wall 241 of the frame to the maximum diameter D1 of the outer wall 242 of the frame is set to between 0.2 and 0.4, or between 0.2 and 0.5. Alternatively, the ratio of the minimum diameter D2 of the inner wall 241 to the maximum diameter D1 of the outer wall 242 of the frame is set to 0.3, 0.35, 0.4, or 0.45.

[0061] As can be understood, the frame 24 is a component on which the diaphragm 221 is mounted, and the first connection portion 2216 and the second connection portion 2217 of the diaphragm 221 may be directly connected to the frame 24.

[0062] In some embodiments, to improve the connection strength between the diaphragm 221 and the frame 24, the electroacoustic transducer 20 may further include a first fixing ring 25 and a second fixing ring 26, as shown in Figures 2 and 8. The first fixing ring 25 fixes the first connection portion 2216 to the inner wall 241 of the frame; that is, the first connection portion 2216 is fixedly connected to the inner wall 241 of the frame by the first fixing ring 25. The second fixing ring 26 fixes the second connection portion 2217 to the outer wall 242 of the frame; that is, the second connection portion 2217 is fixedly connected to the outer wall 242 of the frame by the second fixing ring 26. In this way, the connection and fixing of the first fixing ring 25 and the second fixing ring 26 achieve a stable connection between the diaphragm 221 and the frame 24.

[0063] Here, the material of the first fixing ring 25 and the second fixing ring 26 may be steel. For example, both the first fixing ring 25 and the second fixing ring 26 may be steel rings.

[0064] As can be understood, the maximum outer diameter of the second fixing ring 26 is related to the maximum outer diameter of the frame outer wall 242. That is, the larger the maximum outer diameter of the frame outer wall 242, the larger the maximum outer diameter of the second fixing ring 26 may be. Since the diaphragm 221 is connected to the frame outer wall 242 by the second fixing ring 26, the larger the maximum outer diameter of the second fixing ring 26, the larger the maximum outer diameter of the diaphragm 221 may be. In this case, the frequency response effect of the diaphragm 221 improves. Based on this, in order to better increase the diameter of the diaphragm 221, in this disclosure, as shown in Figure 2, the ratio of the maximum outer diameter d1 of the second fixing ring 26 to the maximum diameter D1 of the frame outer wall 242 is set to 0.7 to 1. In this way, the diameter of the diaphragm 221 can be increased, that is, the frequency response effect of the diaphragm 221 can be improved.

[0065] Selectively, the ratio of the maximum outer diameter d1 of the second fixing ring 26 to the maximum diameter D1 of the outer wall 242 of the frame may be between 0.8 and 1, or between 0.9 and 1. Alternatively, the ratio of the maximum outer diameter d1 of the second fixing ring 26 to the maximum diameter D1 of the outer wall 242 of the frame may be 0.75, 0.85, or 0.95.

[0066] Preferably, the ratio of the maximum outer diameter d1 of the second fixing ring 26 to the maximum diameter D1 of the outer wall 242 of the frame is 1. In this case, the diameter of the diaphragm 221 can be maximized, and the frequency response effect is optimized.

[0067] To further understand, the diaphragm 221 is further connected to the inner wall 241 of the frame by a first fixing ring 25, and the first fixing ring 25 surrounds the hollow passage 21 restricted by the inner wall 241 of the frame. Therefore, the minimum inner diameter of the first fixing ring 25 is related to the cross-sectional area of ​​the hollow passage 21, and in order to improve the cross-sectional area of ​​the hollow passage 21, it is necessary to increase the minimum inner diameter of the first fixing ring 25. In this disclosure, as shown in Figure 2, the ratio of the minimum inner diameter d2 of the first fixing ring 25 to the maximum diameter D1 of the outer wall 242 of the frame is set to 0.1 to 0.5. In this case, the first fixing ring 25 has an appropriate minimum inner diameter, so that ventilation of the electroacoustic transducer 20 is ensured.

[0068] Selectively, the ratio of the minimum inner diameter d2 of the first fixing ring 25 to the maximum diameter D1 of the outer wall 242 of the frame is set to between 0.2 and 0.4, or between 0.2 and 0.5. Alternatively, the ratio of the minimum inner diameter d2 of the first fixing ring 25 to the maximum diameter D1 of the outer wall 242 of the frame is set to 0.3, 0.35, 0.4, or 0.45.

[0069] In the electroacoustic transducer 20, the magnetic circuit system 23 has a magnetic gap, and at least a portion of the first voice coil 222 and at least a portion of the second voice coil 223 are located within the magnetic gap. In this way, the first voice coil 222 and the second voice coil 223 are driven by the magnetic circuit system 23 to vibrate the diaphragm 221, that is, the vibration effect of the diaphragm 221 is related to the magnetic circuit system 23, and based on this, in order to improve the driving force of the electroacoustic transducer 20 and improve the sound pressure level of the electroacoustic transducer 20, the motion of the first voice coil 222 and the second voice coil 223 is driven by the dual magnetic circuit system 23 in this disclosure. Referring to Figures 2 and 9, the magnetic circuit system 23 comprises a second magnetic body 2312, a third magnetic body 2313, and a fourth magnetic body 2314, respectively, installed on the frame 24. The second magnetic body 2312 surrounds the inner wall 241 of the frame, the third magnetic body 2313 surrounds the second magnetic body 2312, and the fourth magnetic body 2314 surrounds the third magnetic body 2313. As can be understood, the second magnetic body 2312, the third magnetic body 2313, and the fourth magnetic body 2314 exhibit a ring-like structure. Here, the second magnetic material 2312 and the third magnetic material 2313 are spaced radially apart to form a third magnetic gap 2323, and the third magnetic material 2313 and the fourth magnetic material 2314 are spaced radially apart to form a fourth magnetic gap 2324, with one end of the first voice coil 222 extending to the third magnetic gap 2323 and one end of the second voice coil 223 extending to the fourth magnetic gap 2324.

[0070] As can be understood, since there are magnetic fields in the direction of a fixed magnetic field within the third magnetic gap 2323 and the fourth magnetic gap 2324, the voice coil located within the magnetic gap moves due to the action of the magnetic field, causing the diaphragm 221 to vibrate.

[0071] In some embodiments, the entirety of the first voice coil 222 and the entirety of the second voice coil 223 may be located within the magnetic gap. As can be understood, along the thickness direction of the electroacoustic transducer 20, the entirety of the first voice coil 222 may extend to the third magnetic gap 2323, and the entirety of the second voice coil 223 may extend to the fourth magnetic gap 2324. In this way, it is possible to ensure that the magnetic field in the third magnetic gap 2323 acts effectively on the first voice coil 222 and the magnetic field in the fourth magnetic gap 2324 acts effectively on the second voice coil 223, thereby ensuring that the entirety of the first voice coil 222 and the second voice coil 223 vibrate the diaphragm 221 and improve the acoustic output effect of the electroacoustic transducer 20. Furthermore, having the entirety of the voice coils located within the magnetic gap is advantageous for reducing the thickness of the electroacoustic transducer 20 and is beneficial for development towards smaller volume.

[0072] In some other embodiments, portions of the first voice coil 222 and the second voice coil 223 may be located within the magnetic gap. As can be understood, along the thickness direction of the electroacoustic transducer 20, the end of a portion of the first voice coil 222 may extend to the third magnetic gap 2323, and the end of a portion of the second voice coil 223 may extend into the fourth magnetic gap 2324. In this way, the alignment of the voice coils and each magnetic material can be facilitated. Furthermore, when the voice coils are located within the magnetic gap, the structures between each magnetic material and the voice coils will not interfere with each other and wear down, and the structural arrangement in this embodiment is advantageous in improving the structural stability of the electroacoustic transducer 20.

[0073] Here, the vibration effect of the electroacoustic transducer 20 is related to the size of the magnetic gap, and based on this, in order to effectively improve the low-frequency harmonic distortion problem of the electroacoustic transducer 20, the sizes of the third magnetic gap 2323 and the fourth magnetic gap 2324 are between 0.5 mm and 1.3 mm in this disclosure, which is advantageous for improving low-frequency harmonic distortion. For example, the sizes of the third magnetic gap 2323 and the fourth magnetic gap 2324 may be 0.5 mm, 0.8 mm, 1.1 mm, or 1.3 mm. Preferably, the sizes of the third magnetic gap 2323 and the fourth magnetic gap 2324 are 0.5 mm.

[0074] To improve the permeability, as can be understood, the magnetic circuit system 23 may further comprise a first permeable member 2331, a second permeable member 2332, and a third permeable member 2333, as shown in Figures 2 and 9, where the permeable members may be referred to as washers. Exemplarily, the first permeable member 2331, the second permeable member 2332, and the third permeable member 2333 have a ring-shaped structure, with the first permeable member 2331 positioned on the side of the second magnetic material 2312 facing the diaphragm 221, the second permeable member 2332 positioned on the side of the third magnetic material 2313 facing the diaphragm 221, and the third permeable member 2333 positioned on the side of the fourth magnetic material 2314 facing the diaphragm 221. For example, the first permeable member 2331 may be fixed to the surface of the second magnetic material 2312 facing the diaphragm 221 by an adhesive method, the second permeable member 2332 may be fixed to the surface of the third magnetic material 2313 facing the diaphragm 221 by an adhesive method, and the third permeable member 2333 may be fixed to the surface of the fourth magnetic material 2314 facing the diaphragm 221 by an adhesive method.

[0075] As can be understood, the first permeable member 2331, the second permeable member 2332, and the third permeable member 2333 may be made of a permeable material. The materials of the second magnetic body 2312, the third magnetic body 2313, and the fourth magnetic body 2314 may be magnetic materials. For example, the magnetic material may be a magnet.

[0076] In some other embodiments, to reduce costs, the motion of the first voice coil 222 and the second voice coil 223 can be driven by a single magnetic circuit system 23. Referring to Figures 10 and 11, Figure 10 is a cross-sectional view of an electroacoustic transducer provided by another embodiment of the present disclosure, and Figure 11 is a second exploded schematic view of an electroacoustic transducer provided by an embodiment of the present disclosure. In this case, the magnetic circuit system 23 comprises a first magnetic body 2311, which is mounted on a frame 24 and surrounds the inner wall 241 of the frame, and the first magnetic body 2311 and the frame 24 are spaced apart to form a first magnetic gap 2321 and a second magnetic gap 2322. The first magnetic gap 2321 surrounds the inner wall 241 of the frame, and the second magnetic gap 2322 surrounds the outer circumference of the first magnetic gap 2321. Exemplary, the first magnetic material 2311 and the inner wall 241 of the frame are spaced apart to form a first magnetic gap 2321, and the first magnetic material 2311 and the outer wall 242 of the frame are spaced apart to form a second magnetic gap 2322. One end of the first voice coil 222 extends to the first magnetic gap 2321, and one end of the second voice coil 223 extends to the second magnetic gap 2322.

[0077] As can be understood, since there are magnetic fields in the direction of a fixed magnetic field within the first magnetic gap 2321 and the second magnetic gap 2322, the voice coil located within the magnetic gap moves due to the action of the magnetic field, causing the diaphragm 221 to vibrate.

[0078] Here, the vibration effect of the electroacoustic transducer 20 is related to the size of the magnetic gap, and based on this, in order to effectively improve the low-frequency harmonic distortion problem of the electroacoustic transducer 20, setting the size of the first magnetic gap 2321 and the second magnetic gap 2322 to between 0.5 mm and 1.3 mm is advantageous for improving low-frequency harmonic distortion in the embodiments of this disclosure. For example, the sizes of the first magnetic gap 2321 and the second magnetic gap 2322 may be 0.5 mm, 0.8 mm, 1.1 mm, or 1.3 mm. Preferably, the size of the first magnetic gap 2321 and the second magnetic gap 2322 is 0.5 mm.

[0079] To further enhance the permeability, the magnetic circuit system 23 may further include a fourth permeable member 2334, which may be referred to as a washer. Exemplarily, the fourth permeable member 2334 has a ring-shaped structure and is installed on the side of the first magnetic material 2311 facing the diaphragm 221. For example, the fourth permeable member 2334 may be fixed to the surface of the first magnetic material 2311 facing the diaphragm 221 by an adhesive method.

[0080] As can be understood, the fourth permeable member 2334 may be made of a permeable material. The material of the first magnetic body 2311 may be a magnetic material. For example, the magnetic material may be a magnet.

[0081] To further understand, the frame 24 serves as a support member for the electroacoustic transducer 20. In some embodiments, referring to Figures 2 and 4, the frame 24 may further comprise a frame bottom wall 243, where the frame bottom wall 243 and the diaphragm 221 are positioned opposite each other in the axial direction of the electroacoustic transducer 20. Here, the magnetic circuit system 23 is mounted on the frame bottom wall 243; that is, the frame bottom wall 243 serves to support the magnetic circuit system 23.

[0082] In some embodiments, referring again to Figures 2 and 4, a rear tuning hole 244 is further provided in the frame 24 to realize a tuning function, and the rear tuning hole 244 communicates with the magnetic gap of the magnetic circuit system 23. Exemplarily, the rear tuning hole 244 may be provided in the bottom wall 243 of the frame. As can be understood, the housing 10 of the headphones 100 may be provided with a rear acoustic output hole 13 that communicates with the rear tuning hole 244, for example, referring to Figure 3, the housing 10 has a rear acoustic output hole 13, which is located on the side of the housing 10 opposite to the ear portion 200, and the rear tuning hole 244 and the rear acoustic output hole 13 can work together to realize a tuning function.

[0083] The above describes the specific structure of the electroacoustic transducer 20. Below, the structure of the headphones 100 will be further explained with reference to the diagrams.

[0084] In some embodiments, referring to Figure 3, a cover cavity 40 is provided on the side of the headphones 100 facing the ear portion 200 to better cover the headphones 100, the first acoustic output hole 11 is in communication with the cover cavity 40, and when the headphones 100 are worn, the cover cavity 40 covers the ear portion 200. As can be understood, at this time, the sound signal emitted by the diaphragm 221 of the electroacoustic transducer 20 is transmitted through the first acoustic output hole 11 to the cover cavity 40, and further transmitted to the person's ear canal, and then enters the ear canal.

[0085] For example, referring to Figure 3, the headphones 100 may be equipped with ear pads 50, which are positioned to surround the ear portion 200 side of the housing 10 and restrict the cover cavity 40. When the headphones 100 are worn, the ear pads 50 adhere to the head and cover the ear portion 200. Here, the ear pads 50 may be made of a flexible material to improve wearing comfort.

[0086] Example 2 The present disclosure will be described in detail below with reference to the examples.

[0087] Referring to Figure 12, which is a schematic diagram of the structure of the ear, Figure 12 shows the physiological location of some parts of the ear. The user's ear 200 may include the helix 210, scaphoid fossa 220, antihelix 230, triangular fossa 240, concha 250, ear canal 260, tragus 270, antitragus 280, and earlobe 290, among which the concha 250 may include the concha rib 251 and the concha cavity 252, and the ear canal 260 is also called the external auditory opening or the opening of the external auditory canal.

[0088] As can be understood, the headphones 100 provided in the embodiments of this disclosure may be over-ear headphones or on-ear headphones, where, when over-ear headphones are fitted to the ear portion 200, the over-ear headphones cover the ear portion 200, enclosing the entire ear portion 200 within a cavity formed by the headphones and the head, and this fitting method provides good sealing. When on-ear headphones are fitted, they differ slightly from over-ear headphones in that they rest on the helix 210 of the ear portion 200. Relatively speaking, the fitting and sealing of over-ear headphones is better than that of on-ear headphones. However, both over-ear headphones and on-ear headphones provide better sealing when fitted than in-ear earphones and can provide better sound quality.

[0089] Referring now to Figures 13 and 14, Figure 13 is a schematic diagram of the structure at a first viewing angle when headphones are worn on the ears in the related technology, and Figure 14 is a schematic diagram of the structure at a second viewing angle when headphones are worn on the ears in the related technology. In the related technology, after the over-ear headphones 100a are worn on the ears, the person's ears are completely covered by the over-ear headphones 100a and sealed in one relatively narrow space. When the ears are in this sealed environment for a long period of time, it is easy for the temperature inside this space to rise, making it easy for bacteria to grow and causing discomfort to the ears. As can be understood, on-ear headphones in the related technology also cover the person's ears, so the same problems occur as with over-ear headphones 100a.

[0090] Based on this, referring to Figures 15 and 16, Figure 15 is a first cross-sectional view of the headphones provided in an embodiment of the present disclosure when worn on the ear, and Figure 16 is a second cross-sectional view of the headphones provided in an embodiment of the present disclosure when worn on the ear. As can be understood, in Figure 15, the opening and closing assembly is in an open state, and in Figure 16, the opening and closing assembly 30 is in a closed state. An embodiment of the present disclosure provides headphones 100 comprising a housing 10, an electroacoustic transducer 20, and an opening and closing assembly 30, wherein the electroacoustic transducer 20 is installed within the housing 10 and has a hollow passage 21 that penetrates the electroacoustic transducer 20 along its own axial direction. As can be understood, since the electroacoustic transducer 20 has a hollow passage 21 that penetrates it, the electroacoustic transducer 20 then exhibits a substantially ring-shaped structure.

[0091] Here, the housing 10 of the headphones 100 has a first acoustic output hole 11, which is located on the side of the housing 10 facing the ear portion 200. As can be understood, when the headphones 100 are worn on the ear portion 200, the sound signal emitted by the electroacoustic transducer 20 is transmitted through the first acoustic output hole 11 to the person's ear canal 260 and then enters the ear canal. The first acoustic output hole 11 communicates with a hollow passage 21. Here, the housing 10 has an outer wall 12, which is positioned opposite the electroacoustic transducer 20 in the axial direction of the electroacoustic transducer 20, and an end face hole 121 is provided in the outer wall 12, which communicates the hollow passage 21 with the external environment. In this way, the first acoustic output hole 11 communicates with the hollow passage 21, so that the first acoustic output hole 11 can communicate with the external environment through the hollow passage 21 and the end face hole 121, thereby enabling airflow conduction and sound transmission.

[0092] The opening / closing assembly 30 switches the communication between the first acoustic output hole 11 and the external environment on and off.

[0093] Here, the opening / closing assembly 30 may be installed in the housing 10. The installation position of the opening / closing assembly 30 in the housing 10 may be as follows.

[0094] In a first feasible embodiment, an opening / closing assembly 30 is installed in the hollow passage 21 of the electroacoustic transducer 20, opening or closing the hollow passage 21. As can be understood, when the opening / closing assembly 30 is in a closed state, the first acoustic output hole 11 and the end face hole 121 are not in communication. When the opening / closing assembly 30 is in an open state, the first acoustic output hole 11 is in communication with the end face hole 121 through the hollow passage 21, enabling communication between the first acoustic output hole 11 and the external environment.

[0095] In a second feasible embodiment, the opening / closing assembly 30 may be provided on one side of the first acoustic output hole 11, opening or closing the first acoustic output hole 11. In this way, by opening or closing the first acoustic output hole 11, communication between the first acoustic output hole 11 and the external environment can be turned on or off, that is, communication between the fourth cavity 40 and the external environment can be turned on / off.

[0096] In a third feasible embodiment, the opening / closing assembly 30 may be further installed on one side of the end face hole 121, opening or closing the end face hole 121 in this way, the opening and closing of the end face hole 121 can turn the communication between the first acoustic output hole 11 and the external environment on or off, that is, the communication between the fourth cavity 40 and the external environment on / off.

[0097] As can be understood, the headphones 100 provided in the embodiments of this disclosure are provided with a hollow passage 21 in the electroacoustic transducer 20 that communicates with a first acoustic output hole 11, an end face hole 121 in the outer wall 12 of the housing 10 that communicates with the hollow passage 21, and an opening / closing assembly 30 that opens or closes the hollow passage 21. When the opening / closing assembly 30 is closed, a sealed listening environment is provided to the ear portion 200, satisfying the user's need for an immersive experience. When the opening / closing assembly 30 is open, the first acoustic output hole 11 communicates with the end face hole 121 through the hollow passage 21, enabling communication between the fourth cavity 40 and the external environment, providing an open listening environment to the ear portion 200. The user can listen to music while also hearing external sounds, satisfying the user's different listening needs, and the headphones 100 can release heat from inside, keeping the ear portion 200 comfortable. Furthermore, by adopting a method of installing a hollow passage 21 in the electroacoustic transducer 20, the length of the path through which airflow or sound flows between the first acoustic output hole 11 and the end face hole 121 can be reduced to the greatest extent possible, effectively improving the breathability of the headphones 100. In addition, by installing the end face hole 121 in the outer wall 12 which is installed opposite the electroacoustic transducer 20, the distance between the end face hole 121 and the hollow passage 21 can be further reduced, further decreasing the length of the path through which airflow or sound flows between the first acoustic output hole 11 and the end face hole 121, thereby improving the breathability of the headphones 100.

[0098] As can be understood here, the shapes of the first acoustic output hole 11 and the end face hole 121 may be circular, but are not limited to circular, and may include, for example, one or more of elliptical, coarse, triangular, rectangular, polygonal, or other complex shapes having decorative properties, and are not limited thereto in this disclosure.

[0099] Here, in order to improve the ventilation of the headphones 100, the sizes of the first acoustic output hole 11, the end face hole 121, and the hollow passage 21 may be made as large as possible. In other words, the larger the cross-sectional area of ​​the first acoustic output hole 11, the end face hole 121, and the hollow passage 21, the better the ventilation of the headphones 100.

[0100] For example, the minimum cross-sectional area of ​​the first acoustic output hole 11 is 15 square millimeters or more. In this way, the breathability of the headphones 100 can be effectively improved, and the quality of sound transmission can also be improved. More preferably, the minimum cross-sectional area of ​​the first acoustic output hole 11 is 25 square millimeters or more, and even more preferably, the minimum cross-sectional area of ​​the first acoustic output hole 11 is 40 square millimeters or more.

[0101] Here, for the sake of understanding, a first reference plane perpendicular to the central axis of the electroacoustic transducer 20 may be created, and in some embodiments, the orthographic projection of the first acoustic output hole 11 on the first reference plane partially overlaps with the orthographic projection of the hollow passage 21 on the first reference plane. In this way, the radial distance between the first acoustic output hole 11 and the hollow passage 21 may be shortened as much as possible, thereby effectively shortening the path between the first acoustic output hole 11 and the hollow passage 21 and further improving the breathability of the headphones 100.

[0102] Since the first acoustic output hole 11 also performs an acoustic output function, in some embodiments, the orthographic projection area of ​​the first acoustic output hole 11 on the first reference plane may be larger than the orthographic projection area of ​​the hollow passage 21 on the first reference plane. In this way, it is possible to effectively improve the breathability of the headphones 100 while ensuring acoustic output quality.

[0103] As can be understood, the electroacoustic transducer 20 comprises a diaphragm 23 having a ring-shaped structure, the diaphragm 23 surrounding a hollow passage 21, and the sound signal generated when the diaphragm 23 vibrates is transmitted to the human ear 200 through a first acoustic output hole 11. In order to improve the acoustic output quality of the first acoustic output hole 11, the orthographic projection of the first acoustic output hole 11 on a first reference plane and the orthographic projection of the diaphragm 23 on a first reference plane overlap at least partially. In this way, the sound signal generated by the vibration of the diaphragm 23 can be transmitted more effectively through the first acoustic output hole 11.

[0104] In some embodiments, considering the large area of ​​the first acoustic output hole 11, the diaphragm 23 of the electroacoustic transducer 20 may be touched by the user. Based on this, the headphones 100 may be equipped with a protective member having a mesh structure, and the protective member is provided at the first acoustic output hole 11. In this way, the electroacoustic transducer 20 can be protected by the protective member. Exemplarily, the protective member may be a metal mesh, sponge, web, or plastic supporter, and for example, protection of the electroacoustic transducer 20 can be implemented by adding a metal mesh, sponge, web, or plastic supporter to the first acoustic output hole 11. Here, the metal mesh, sponge, web, or plastic supporter may be fixed to the first acoustic output hole 11 by a process such as adhesive bonding, heat melting, injection molding, or ultrasonic connection. For example, in some embodiments, the metal mesh, web, or plastic supporter may be fixedly connected to the first acoustic output hole 11 by an injection molding process.

[0105] In some embodiments, to better cover the headphones 100 over the ear portion 200, as shown in Figure 15, a fourth cavity 40 is formed on the side of the headphones 100 facing the ear portion 200, the first acoustic output hole 11 communicates with the fourth cavity 40, and when the headphones 100 are worn, the fourth cavity 40 covers the ear portion 200. As can be understood, at this time, the sound signal generated by the diaphragm 23 of the electroacoustic transducer 20 is transmitted to the fourth cavity 40 through the first acoustic output hole 11, and further transmitted to the person's ear canal 260, and then enters the ear canal.

[0106] Exemplary, and continuing to refer to Figure 15, the headphones 100 may also be equipped with ear pads 50, which are positioned to surround the ear portion 200 side of the housing 10 and which restrict the fourth cavity 40. When the headphones 100 are worn, the ear pads 50 adhere to the head and cover the ear portion 200. Here, the ear pads 50 may be made of a flexible material, which can improve wearing comfort.

[0107] Furthermore, in order to improve conductivity between the ear portion 200 and the external environment when the headphones 100 are worn, a second reference plane is constructed in three regions of the ear portion 200: the tragus 270, the antitragus 280, and the antihelix 230. The projection along the coronal axis direction on the second reference plane of the first acoustic output hole 11 and / or end face hole 121 is located in or covers the region formed by the projection along the coronal axis direction on the second reference plane of the concha 251, antihelix 230, antitragus 280, and tragus 270 of the ear portion 200. More preferably, the projection along the coronal axis direction on the second reference plane of the first acoustic output hole 11 and / or end face hole 121 is located in the region formed by the projection along the coronal axis direction on the second reference plane of the concha cavity 252.

[0108] To further understand, when the headphones 100 are worn on the head, the ear pads 50 of the headphones 100 adhere to the head, and a ring shape is formed on the outer edge of the ear pads 50 that adheres to the head, and the orthographic projection of the first acoustic output hole 11 and / or end face hole 121 on the head is located in the ring-shaped region after it has been reduced inward by 10 to 15 millimeters, for example, the orthographic projection of the first acoustic output hole 11 and / or end face hole 121 on the head is located in the ring-shaped region after it has been reduced inward by 10, 12, or 15 millimeters. Furthermore, the orthographic projection of the first acoustic output hole 11 and / or end face hole 121 on the head is located in the ring-shaped region after it has been reduced inward by 16 to 25 millimeters, for example, the orthographic projection of the first acoustic output hole 11 and / or end face hole 121 on the head is located in the ring-shaped region after it has been reduced inward by 16, 20, or 25 millimeters. Furthermore, the ring-shaped region is located after the orthographic projection of the first acoustic output hole 11 and / or end face hole 121 on its head has been reduced inward by 26 to 35 millimeters, for example, in the ring-shaped region after the orthographic projection of the first acoustic output hole 11 and / or end face hole 121 on its head has been reduced inward by 26, 30, or 35 millimeters.

[0109] To make it clear, referring to Figure 17, which is a schematic projection of a hollow passage, ear hole and end face hole provided in an embodiment of the present disclosure along the coronal axis direction in a second reference plane H. There is a first minimum gap D1 between the projection of the hollow passage 21 along the coronal axis direction in the second reference plane H and the projection of the ear hole 260 of the ear portion 200 along the coronal axis direction in the second reference plane H, and there is a second minimum gap D2 between the projection of the end face hole 121 along the coronal axis direction in the second reference plane H and the projection of the ear hole 260 along the coronal axis direction in the second reference plane H, and the first minimum gap D1 is less than or equal to the second minimum gap D2 in order to further improve the degree of openness of the ear portion 200 to the outside. As can be understood, in accordance with the above installation, when the headphones 100 are open, that is, when the opening / closing assembly 30 is open, the tragus 270 and ear canal 260 of the ear portion 200 are visible through the first acoustic output hole 11, the end face hole 121, and the hollow passage 21, and the ear portion 200 is electrically connected to the outside.

[0110] The opening / closing assembly 30 is used primarily for opening or closing the hollow passage 21, and its structure is not specifically limited in this disclosure, as long as it can achieve opening or closing the hollow passage 21. For example, the opening / closing assembly 30 may be a shutter assembly similar to a "shutter" structure, and the shutter assembly may include a plurality of blades, the plurality of blades being able to move along the radial direction of the hollow passage 21, the plurality of blades being able to move close to each other to achieve a sealing function, and the plurality of blades being able to move far apart to achieve an opening function. Exemplary, a perspective view of the headphones 100 in the open state is shown in Figure 18, and a perspective view of the headphones 100 in the closed state is shown in Figure 19.

[0111] In some embodiments, the opening / closing assembly 30 is attached to the housing 10, and the opening / closing assembly 30 may be connected to a transport mechanism (not shown) installed in the housing 10, with one end of the transport structure located outside the housing 10 and the other end of the transport mechanism connected to the opening / closing assembly 30, for example, to a vane of the opening / closing assembly 30, and the user opens or closes the opening / closing assembly 30 by driving the transport mechanism, thereby switching between the open and closed states of the headphones 100.

[0112] In some other embodiments, the transport mechanism may be connected to an electric motor that drives the transport mechanism to open or close the opening / closing assembly 30, for example, the electric motor can receive commands issued by the main control chip of the headphones 100 and control the opening or closing of the opening / closing assembly 30.

[0113] The above describes the first acoustic output hole 11 of the headphones 100 and some related structures. To further clarify other structures of the headphones 100, such as the structure between the hollow passage 21 and the end face hole 121, a detailed explanation will be provided below with reference to the drawings.

[0114] Referring to Figure 15, a first cavity 13 is formed in the housing 10, and the first cavity 13 is located between the electroacoustic transducer 20 and the end face hole 121, at which time the outer wall 12 of the headphones 100 and the electroacoustic transducer 20 are installed separately, and the end face hole 121 on the outer wall 12 communicates with the hollow passage 21 by the first cavity 13. As can be understood, when the opening and closing assembly 30 is opened, the hollow passage 21 communicates with the first cavity 13, and the first cavity 13 communicates with the end face hole 121, and in this way the hollow passage 21 can communicate with the end face hole 121 by the first cavity 13, that is, the first cavity 13 serves to communicate the hollow passage 21 and the end face hole 121.

[0115] Illustratively, referring to Figure 15, the housing 10 comprises an inner wall 14, an outer wall 12, and a connecting wall 15, the inner wall 14 and the outer wall 12 being positioned opposite each other in the axial direction of the electroacoustic transducer 20, the connecting wall 15 being connected between the inner wall 14 and the outer wall 12, and together the inner wall 14, the outer wall 12, and the connecting wall 15 regulating a first cavity 13. A first acoustic output hole 11 is located in the inner wall 14. As can be understood, when the headphones 100 are fitted to the earpiece 200, the inner wall 14 is positioned on the side closer to the earpiece 200.

[0116] To further understand, in the above embodiment, electrical conductivity between the hollow passage 21 and the end face hole 121 is achieved by the first cavity 13, and the shorter the passage path between the end face hole 121 and the first cavity 13, the better in order to improve airflow between the hollow passage 21 and the end face hole 121. Preferably, the outer wall 12 on which the end face hole 121 is installed may be bonded to the electroacoustic transducer 20, in which case it is not necessary for the end face hole 121 to communicate with the hollow passage 21 of the electroacoustic transducer 20 by the first cavity 13, and the end face hole 121 communicates directly with the hollow passage 21 of the electroacoustic transducer 20, further improving airflow between the hollow passage 21 and the end face hole 121.

[0117] Furthermore, the opening / closing assembly 30 is located in the first cavity 13 of the housing 10, at the point where the hollow passage 21 and the end face hole 121 communicate, and can switch the communication between the end face hole 121 and the hollow passage 21 on or off. In this way, the communication or blockage between the control end face hole 121 and the hollow passage 21 can control the communication or blockage between the first acoustic output hole 11 and the external environment. By installing the opening / closing assembly 30 in the first cavity 13, the housing 10 is used to protect the opening / closing assembly 30, thereby mitigating or avoiding wear on the opening / closing assembly 30.

[0118] In some embodiments, the orthographic projection of the hollow passage 21 onto the outer wall 12 of the housing 10 overlaps at least partially with the end face hole 121 on the outer wall 12. Alternatively, the orthographic projection of the hollow passage 21 onto the outer wall 12 of the housing 10 does not completely overlap with the end face hole 121 on the outer wall 12.

[0119] For example, the orthographic projection of the hollow passage 21 onto the outer wall 12 of the housing 10 may overlap with the end face hole 121 on the outer wall 12. In this way, the hollow passage 21 and the end face hole 121 can be directly conductive along the axial direction of the electroacoustic transducer 20, improving the communication effect between them and improving the breathability of the headphones.

[0120] For example, the orthographic projection of the hollow passage 21 onto the outer wall 12 of the housing 10 and the end face hole 121 on the outer wall 12 do not have to overlap at all; that is, the orthographic projection of the hollow passage 21 onto the outer wall 12 of the housing 10 and the end face hole 121 on the outer wall 12 may be offset. In this way, multiple positional requirements for the end face hole 121 on the outer wall 12 can be met, the communication effect between the hollow passage 21 and the end face hole 121 can be satisfied, and the flexibility of the headphone structure can be improved.

[0121] Exemplary, the radial distance between the central axis of the end face hole 121 and the central axis of the hollow passage 21 is between 0 millimeters and 36 millimeters, i.e., 0 millimeters or more and 36 millimeters or less. In this way, the passage path between the end face hole 121 and the hollow passage 21 may be made as small as possible to improve the airflow between the hollow passage 21 and the end face hole 121. As can be understood, the smaller the distance between the central axis of the end face hole 121 and the central axis of the hollow passage 21, the better, more preferably between 0 millimeters and 20 millimeters, i.e., 0 millimeters or more and 20 millimeters or less, and even more preferably between 0 millimeters and 5 millimeters, i.e., 0 millimeters or more and 5 millimeters or less. Here, the distance between the central axis of the end face hole 121 and the central axis of the hollow passage 21 may be set according to the specific circumstances. For example, the radial distance of the electroacoustic transducer 20 between the central axis of the end face hole 121 and the central axis of the hollow passage 21 may be 36 millimeters, 20 millimeters, 10 millimeters, 5 millimeters, or 0 millimeters. As can be understood, when the radial distance between the central axis of the end face hole 121 and the central axis of the hollow passage 21 is 0 millimeters, the end face hole 121 and the hollow passage 21 are coaxial, and in this case, the airflow between the hollow passage 21 and the end face hole 121 is best.

[0122] In some embodiments, to further improve the airflow between the hollow passage 21 and the end face hole 121, the shorter the axial distance between the end face hole 121 and the electroacoustic transducer 20, the better. For example, referring to Figure 15, the electroacoustic transducer 20 has a first surface A facing the end face hole 121, and the axial distance d1 between the end face hole 121 and the first surface A of the electroacoustic transducer 20 is between 0.5 millimeters and 10 millimeters. For example, the axial distance d1 between the end face hole 121 and the first surface A may be 0.5 millimeters, 1 millimeter, 2 millimeters, 4 millimeters, 6 millimeters, 8 millimeters, 10 millimeters, etc.

[0123] Specifically, as shown in Figure 15, the electroacoustic transducer 20 may comprise a frame 22, a diaphragm 23, a voice coil (not shown), and a magnetic body 24, wherein the diaphragm 23 is mounted on the frame 22, and the diaphragm 23 and frame 22 surround a hollow passage 21. The magnetic body 24 is mounted on the frame 22 and surrounds the hollow passage 21. Here, the magnetic body 24 forms the magnetic circuit system of the electroacoustic transducer 20, and the diaphragm 23 and voice coil form the vibration system of the electroacoustic transducer 20. One end of the voice coil is fixedly connected to the diaphragm 23, and the other end extends to the magnetic gap of the magnetic system, and as understood, the magnetic system can drive the motion of the voice coil to vibrate the diaphragm 23 and generate sound.

[0124] In some embodiments, the size of the hollow passage 21 of the electroacoustic transducer 20 may be made as large as possible to ensure ventilation between the headphones 100 and the external environment; that is, the larger the cross-sectional area of ​​the hollow passage 21, the better the ventilation of the headphones 100. For example, the minimum cross-sectional area of ​​the hollow passage 21 is 5 square millimeters or more. More preferably, the minimum cross-sectional area of ​​the hollow passage 21 is 10 square millimeters or more, and furthermore, the minimum cross-sectional area of ​​the hollow passage 21 is 20 square millimeters or more.

[0125] To further understand this, the size of the end holes 121 may be made as large as possible, that is, the larger the cross-sectional area of ​​the end holes 121, the better the ventilation of the headphones 100. Here, the minimum cross-sectional area of ​​the end holes 121 may be 15 square millimeters or more, more preferably 25 square millimeters or more, and even more preferably 40 square millimeters or more.

[0126] In some embodiments, to better realize airflow conduction between the hollow passage 21 and the end face hole 121, refer to Figure 20, which is a third cross-sectional view of the headphones provided in embodiments of the present disclosure when worn on the ear. Furthermore, a first passage 131 may be formed in the first cavity 13, and as understood, the airflow between the hollow passage 21 and the end face hole 121 can be conducted through the first passage 131, which connects the end face hole 121 and the hollow passage 21.

[0127] For example, to facilitate the formation of the first passage 131, a first ring-shaped projection 122 may be formed on the outer wall 12 of the housing 10, surrounding the end face hole 121 and projecting toward the hollow passage 21, thereby restricting the first passage 131. Here, the first ring-shaped projection 122 can achieve a sealed connection with the hollow passage 21 by a material such as double-sided tape, adhesive, or a sealing ring, thereby allowing airflow between the hollow passage 21 and the end face hole 121 to be conducted through the first passage 131.

[0128] As can be understood, the end face hole 121 and the hollow passage 21 may be connected by a first cavity, which may be connected by a cavity region within the first cavity 13 (i.e., the structure shown in Figure 15 of this disclosure), or by a passage formed by structural components in the first cavity 13 (i.e., the first passage 131, the structure shown in Figure 20 of this disclosure).

[0129] As can be understood, since airflow conduction between the hollow passage 21 and the end face hole 121 is achieved by the first passage 131, the shorter the passage path between the end face hole 121 and the hollow passage 21, the better. That is, the shorter the length of the first passage 131, the better in order to improve the ventilation of the headphones 100.

[0130] To further understand, the length of the first passage 131 is the height of the first ring-shaped projection 122 in the direction toward the hollow passage 21, that is, it may be understood that the smaller the height of the first ring-shaped projection 122 in the direction toward the hollow passage 21, the better. Exemplaryly, the range of values ​​for the height of the first ring-shaped projection 122 in the direction toward the hollow passage 21 may be between 0 millimeters and 10 millimeters, that is, the height of the first ring-shaped projection 122 may be 0 millimeters or more and 10 millimeters or less. For example, the height of the first ring-shaped projection 122 may be 0 millimeters, 2 millimeters, 4 millimeters, 6 millimeters, 8 millimeters, 10 millimeters, etc. To understand, when the height of the first ring-shaped projection 122 is 0 millimeters, the outer wall 12 on which 121 is installed is attached to the electroacoustic transducer 20.

[0131] Here, since the first passage 131 serves to conduct airflow, in order to effectively improve the breathability of the headphones 100, the minimum cross-sectional area of ​​the first passage 131 is made to be greater than or equal to the maximum cross-sectional area of ​​the hollow passage 21 in order to improve airflow conductivity.

[0132] Exemplary, the minimum cross-sectional area of ​​the first passage 131 is 5 square millimeters or more, more preferably 10 square millimeters or more, and even more preferably 20 square millimeters or more.

[0133] Furthermore, based on the fact that the end face hole 121 and the hollow passage 21 are in communication with the first passage 131 in the first cavity 13, the opening / closing assembly 30 is located in the first passage 131 and can turn the communication of the first passage 131 on or off. Exemplarily, the opening / closing assembly 30 may be connected to the inner wall of the first passage 131. In this way, the installation of the opening / closing assembly 30 in the first cavity 13 can be facilitated, and by using the opening / closing assembly 30 to control the communication or blocking of the first passage 131, communication or blocking between the end face hole 121 and the hollow passage 21 can be achieved.

[0134] In some embodiments, to implement a tuning function, the headphones 100 may be further provided with rear acoustic output holes. For example, referring to Figure 20, the housing 10 has a first rear acoustic output hole 16, which is located on the side of the housing 10 opposite to the ear portion 200, and which communicates with the first cavity 13. Thus, the headphones 100 can be tuned using the first rear acoustic output hole 16.

[0135] In the above embodiment, airflow between the hollow passage 21 and the end face hole 121 is achieved by a first passage 131 formed by a first ring-shaped projection 122 on the outer wall 12. In some other embodiments, airflow between the hollow passage 21 and the end face hole 121 may be achieved by a different structure.

[0136] Alternatively, referring to Figure 21, which is a fourth cross-sectional view of the headphones provided in an embodiment of the present disclosure when worn on the ear. The headphones 100 may further comprise an intermediate housing 60 which covers the electroacoustic transducer 20, a second cavity 132 is confined between the intermediate housing 60 and the electroacoustic transducer 20, the second cavity 132 communicates with a hollow passage 21, and a communication hole 61 is provided in the intermediate housing 60 which communicates with the second cavity 132 and the end hole 121. In this way, the airflow in the hollow passage 21 flows to the end hole 121 through the second cavity 132 and the communication hole 61, thereby enabling airflow conduction between the hollow passage 21 and the end hole 121.

[0137] As can be understood, since an intermediate housing 60 is additionally installed, intermediate housings 60 of different specification sizes can be installed as needed, and furthermore, they can be selected and installed to replace with an intermediate housing 60 of the desired specification size as needed, thereby improving the practicality and convenience of the headphones 100.

[0138] Referring to Figure 22, which shows a fifth cross-sectional view of the headphones provided in the embodiments of the present disclosure when worn on the ear. The intermediate housing 60 covers the electroacoustic transducer 20 so as to restrict a second cavity 132 and a second passage 134 that do not communicate with each other, the second passage 134 communicating with a hollow passage 21, and the intermediate housing 60 is provided with a communication hole 61 that communicates with the second passage 134, the communication hole 61 communicating with the second passage 134 and the end face hole 121. In this way, the airflow in the hollow passage 21 can flow to the end face hole 121 through the second passage 134 and the communication hole 61 so as to enable airflow conduction between the hollow passage 21 and the end face hole 121.

[0139] Here, the intermediate housing 60 includes an intermediate housing bottom wall 62 installed opposite the electroacoustic transducer 20, and a communication hole 61 is installed in the intermediate housing bottom wall 62. The intermediate housing bottom wall 62 is provided with a second ring-shaped projection 621 that surrounds the communication hole 61 and protrudes toward the hollow passage 21, and the second ring-shaped projection 621 restricts the second passage 134 that communicates with the hollow passage 21. Here, the second ring-shaped projection 621 can achieve a sealed connection with the hollow passage 21 by a material such as double-sided tape, adhesive or a sealing ring, thereby allowing airflow between the hollow passage 21 and the end face hole 121 to be conducted through the second passage 134.

[0140] As can be understood, since airflow between the hollow passage 21 and the end face hole 121 is achieved by the second passage 134, the shorter the passage path between the end face hole 121 and the hollow passage 21, the better. That is, the shorter the length of the second passage 134, the better in order to improve the ventilation of the headphones 100.

[0141] To further understand, the length of the second passage 134 is the height of the second ring-shaped projection 621 in the direction toward the hollow passage 21, that is, the smaller the height of the second ring-shaped projection 621 in the direction toward the hollow passage 21, the better. Exemplaryly, the range of the height value of the second ring-shaped projection 621 in the direction toward the hollow passage 21 is between 0 millimeters and 10 millimeters, that is, the height of the second ring-shaped projection 621 is between 0 millimeters and 10 millimeters. For example, the height of the second ring-shaped projection 621 may be 0 millimeters, 2 millimeters, 4 millimeters, 6 millimeters, 8 millimeters, 10 millimeters, etc. To understand, when the height of the second ring-shaped projection 621 is 0 millimeters, the intermediate housing bottom wall 62 in which the communication hole 61 is installed is bonded to the electroacoustic transducer 20.

[0142] Here, the second passage 134 plays a role in conducting airflow, so in order to effectively improve the breathability of the headphones 100, the minimum cross-sectional area of ​​the second passage 134 is made to be greater than or equal to the maximum cross-sectional area of ​​the hollow passage 21 in order to improve airflow conductivity.

[0143] Exemplary, the minimum cross-sectional area of ​​the second passage 134 is 5 square millimeters or more, more preferably 10 square millimeters or more, and even more preferably 20 square millimeters or more.

[0144] Here, in order to realize the tuning function, a rear acoustic output port may be provided in the headphones 100. For example, referring to Figure 22, the housing 10 has a second rear acoustic output port 17, and the second rear acoustic output port 17 is located on the side of the housing 10 opposite to the ear portion 200. When the intermediate housing 60 covers the electroacoustic transducer 20, the intermediate housing 60 divides the first cavity 13 into a second cavity 132 and a third cavity 133. The rear acoustic output port 17 communicates with the third cavity 133, and the intermediate housing 60 has a first acoustic output communication port 63 which communicates with the second cavity 132 and the third cavity 133. In this way, communication is achieved between the second cavity 132, the first acoustic output communication port 63, the third cavity 133 and the second rear acoustic output port 17, and the headphones 100 can be tuned using the second rear acoustic output port 17.

[0145] As can be understood, the intermediate housing bottom wall 62 and the outer wall 12 of the housing 10 are installed facing each other, and in order to minimize the distance between the intermediate housing bottom wall 62 and the outer wall 12, the intermediate housing bottom wall 62 may be bonded to the outer wall 12, in which case the end face hole 121 can better achieve communication between the intermediate housing bottom wall 62 and the communication hole 61.

[0146] In some embodiments, the intermediate housing 60 and the housing 10 are installed separately. The intermediate housing 60 and the housing 10 may be integrally molded, and for example, both may be made of plastic material, and may be integrally molded by injection molding or secondary injection molding. In this way, the connection stability between the intermediate housing 60 and the housing 10 can be improved, and the structural stability of the headphones 100 can be improved.

[0147] The intermediate housing 60 and the housing 10 are separate structures and may be connected to each other. For example, they may be connected by an engagement mechanism; that is, the intermediate housing 60 may have an engagement projection, and the housing 10 may have an engagement hole, with the engagement projection engaging into the engagement hole to achieve connection between the intermediate housing 60 and the housing 10. Furthermore, for example, the intermediate housing 60 and the housing 10 may be further connected by fastening components. This disclosure is not limited to the method of connection between the intermediate housing 60 and the housing 10. In this way, the flexibility of connection between the intermediate housing 60 and the housing 10 can be improved, making the installation and assembly of the structure more convenient and improving the structural flexibility of the headphones.

[0148] In some embodiments, referring to Figure 21, the bottom wall 62 of the intermediate housing 60 and the outer wall 12 of the housing 10 may be bonded to each other. In some other embodiments, the intermediate housing 60 does not need to have a bottom wall 62, and the side wall of the intermediate housing 60 may be directly connected to the outer wall 12 of the housing 10, thereby forming a second cavity 132, and since the bottom wall 62 of the intermediate housing is removed, it contributes to reducing the axial thickness of the headphones 100 and contributes to making the headphones 100 lighter and thinner.

[0149] Referring now to Figure 23, which shows a sixth cross-sectional view of the headphones provided in the embodiment of the present disclosure when worn on the ear. The intermediate housing 60 covers the electroacoustic transducer 20 so as to form a second cavity 132, and a third rear acoustic output hole 18 may be provided in the outer wall 12 of the housing 10 to realize a tuning function, and a second acoustic output communication hole 622 is provided in the bottom wall 62 of the intermediate housing which communicates with the second cavity 132, so that the third rear acoustic output hole 18 communicates with the second acoustic output communication hole 622. In this way, the third rear acoustic output hole 18 communicates with the second cavity 132 by the second acoustic output communication hole 622, and the headphones 100 can be tuned by the third rear acoustic output hole 18.

[0150] Example 3 The present disclosure will be described in detail below with reference to the examples.

[0151] Referring to Figures 24 to 33, embodiments of this disclosure provide headphones, which may be over-ear headphones or on-ear headphones. To facilitate a detailed explanation of the headphone structure, the following embodiments will all be described using examples where the headphones are over-ear headphones.

[0152] Referring to Figures 24 and 25, the headphones include a housing 100, which serves as the main body component of the headphones, supports the headphones' devices, facilitates covering the headphones over the user's ears, and facilitates covering the entire ear area within the cavity formed by the headphones and the head.

[0153] The headphones further include an electroacoustic transducer 200, which can convert an electrical signal output from a sound source into sound audible to the human ear. Here, the electroacoustic transducer 200 is installed inside the housing 100, that is, the housing 100 covers the electroacoustic transducer 200.

[0154] The electroacoustic transducer 200 is provided with a hollow passage 210 that penetrates it along its own axial direction; that is, the hollow passage penetrates two opposing walls of the electroacoustic transducer 200 along its own axis, so that the electroacoustic transducer 200 has a substantially ring-shaped structure. The shape of the hollow passage may be regular or irregular; for example, the cross section perpendicular to the axial direction of the electroacoustic transducer 200 may be the longitudinal section, and the longitudinal cross-sectional shape of the hollow passage may be circular, square, or other regular shape.

[0155] In this example, the electroacoustic transducer 200 comprises a vibration system and a magnetic circuit system. The vibration system includes a diaphragm, a first voice coil, and a second voice coil, where the diaphragm surrounds a hollow passage 210, that is, the hollow passage 210 penetrates the diaphragm, the first voice coil is connected to the diaphragm and surrounds the hollow passage, and the second voice coil is connected to the diaphragm and surrounds the outer circumference of the first voice coil. The magnetic circuit system drives the motion of the first and second voice coils to vibrate the diaphragm and generate sound. The structure of the magnetic circuit system is the same as that of the prior art, and therefore, no further explanation is provided in this embodiment.

[0156] Continuing to refer to Figure 25, the housing 100 has a first acoustic output hole 110, which is located on the side of the housing 100 facing the ear. Here, the orthographic projection of the first acoustic output hole 110 on the electroacoustic transducer 200 and the hollow passage 210 overlap at least partially, so that the first acoustic output hole 110 and the electroacoustic transducer 200 are in communication. As can be understood, when the headphones are worn on the ears, the diaphragm of the electroacoustic transducer 200 vibrates, and the diaphragm emits sound into the anterior cavity, and the emitted sound signal is transmitted to the person's ear canal through the first acoustic output hole 110 and can then enter the ear canal.

[0157] The housing 100 further has an end face hole 120, which is located on the side of the housing 100 opposite the ear portion. To facilitate a detailed explanation of the positions of the first acoustic output hole 110 and the end face hole 120, the wall surface of the housing 100 that is close to the ear portion will be referred to as the inner wall, and the wall surface of the housing 100 that is away from the ear portion and opposite the inner wall will be referred to as the outer wall 160. Here, the first acoustic output hole 110 is installed in the inner wall of the housing 100 and penetrates the inner wall of the housing 100 to communicate with the hollow passage 210 of the electroacoustic transducer 200. The end face hole 120 is installed in the outer wall 160 of the housing 100 and penetrates the outer wall 160 of the housing 100 to enable communication between the end face hole 120 and the external environment.

[0158] It should be understood that, in order to dissipate heat from inside the headphones and keep the ears comfortable, it is necessary to connect the end face hole 120 and the hollow passage 210, thereby sequentially connecting the first acoustic output hole 110, the hollow passage 210, and the end face hole 120, in order to allow the gas in the cavity formed by the housing 100 and the ear portion to diffuse into the external environment.

[0159] The communication between the hollow passage 210 and the end face hole 120 may be understood as either direct or indirect communication. In one example, the communication between the hollow passage 210 and the end face hole 120 is direct communication, that is, at least the portion of the housing 100 on which the end face hole 120 is installed is attached to the electroacoustic transducer 200 so as to connect the end face hole 120 and the hollow passage 210. In addition, to prevent the rear tuning hole 220 from becoming clogged, there is a certain gap between the area of ​​the housing 100 facing the rear tuning hole 220 of the electroacoustic transducer 200 and the rear tuning hole 220. In another example, the hollow passage 210 is indirectly in communication with the end face hole 120, for example, a communication passage 130 is formed within the housing 100, and the communication passage 130 overlaps with at least the hollow passage 210 and the end face hole 120, thereby enabling the communication passage 130 to communicate with the hollow passage 210 and the end face hole 120, and further enabling the first acoustic output hole 110, the hollow passage 210 and the end face hole 120 to communicate sequentially in the axial direction parallel to the electroacoustic transducer 200. As can be understood, since airflow conduction between the hollow passage 210 and the end face hole 120 is achieved by the communication passage 130, the shorter the passage path between the end face hole 120 and the hollow passage 210, the better; that is, the shorter the length of the communication passage 130, the better in order to improve the ventilation of the headphones.

[0160] For the sake of understanding, a plane perpendicular to the axial direction of the electroacoustic transducer 20 may be created as the first reference plane; that is, the plane shown in Figure 25 is the first reference plane. The communication passage 130 overlaps with the hollow passage 210 to some extent, and it can be understood that the size of the communication passage 130 in the axial direction perpendicular to the electroacoustic transducer 200 is greater than or equal to the size of the hollow passage 210 in the axial direction perpendicular to the electroacoustic transducer 200; that is, the cross-sectional area of ​​the communication passage 130 is greater than or equal to the cross-sectional area of ​​the hollow passage 210. In this way, the airflow conduction effect of the communication passage 130 can be improved, and the breathability of the headphones can be effectively improved. Correspondingly, the communication passage 130 overlaps with the end face hole 120 to some extent, and as with the explanation above, the explanation of this is omitted in this embodiment.

[0161] In this embodiment, by installing a hollow passage 210, an end face hole 120, and a communication passage 130, the first acoustic output hole 110 can communicate with the end face hole 120 via the hollow passage 210 and the communication passage 130, and further communication between the first acoustic output hole 110 and the external environment can be achieved, providing an open listening environment to the ear, allowing the user to hear external sounds while listening to music, satisfying the user's different listening needs, as well as releasing heat from inside the headphones and keeping the ear comfortable.

[0162] Furthermore, by adopting a method of installing a hollow passage 210 in the electroacoustic transducer 200, the length of the path through which airflow or sound flows between the first acoustic output hole 110 and the end face hole 120 can be reduced to the maximum extent, thereby effectively improving the breathability of the headphones.

[0163] Referring to Figure 25, a first resonant cavity 300 is formed on the side of the headphones facing the ear portion 10, and the first resonant cavity 300 communicates with the first acoustic output hole 110. When the headphones are worn, the first resonant cavity 300 covers the ear portion 10. It should be understood that the first resonant cavity 300 may be formed by the housing 100 itself, or it may be formed by surrounding the housing 100 with another member. For example, an ear pad 700 is provided on the side of the housing 100 facing the ear portion 10, that is, the ear pad 700 is installed on the inner wall of the housing 100. The ear pad 700 and the inner wall of the housing 100 surround each other to form the first resonant cavity 300, and the first resonant cavity 300 communicates with the chamber of the housing 100 through the first acoustic output hole 110. When the headphones are worn, the ear pads 700 are attached to the head, covering the ear area 10. The ear pads 700 may be made of a flexible material, which can improve wearing comfort.

[0164] The ear pad 700 covers the ear portion 10, the first resonant cavity 300 forms a relatively sealed cavity, and the first resonant cavity 300 communicates with the end face hole 120 sequentially through the first acoustic output hole 110, the hollow passage 210, and the communication passage 130, so that each of the above members forms a cavity structure in which one end is sealed and the other end is open, and further the first resonant cavity 300, the first acoustic output hole 110, the hollow passage 210, the communication passage 130, and the end face hole 120 form a first Helmholtz resonance system.

[0165] Referring to Figure 25, a second resonant cavity 140 is further formed within the housing 100, having a second acoustic output hole 150 on the side of the housing 100 opposite the ear portion, and positioned at a distance from the end face hole 120. In other words, the second acoustic output hole 150 is located on the outer wall of the housing 100 and on the side wall of the housing 100 opposite to the first acoustic output hole 110.

[0166] The second resonant cavity 140 connects the rear tuning hole 220 of the electroacoustic transducer 200 with the second acoustic output hole 150. As can be understood, the rear tuning hole 220 is installed in the electroacoustic transducer 200, with one end of the rear tuning hole 220 used to communicate with the magnetic gap of the magnetic circuit system of the electroacoustic transducer 200, and the other end of the rear tuning hole 220 communicating with the second resonant cavity 140. Here, the second resonant cavity 140 may be substantially ring-shaped, and the second resonant cavity 140 is installed surrounding the electroacoustic transducer 200, thus making it easier to select the installation position of the rear tuning hole 220 and facilitating communication between the rear tuning hole 220 and the second resonant cavity 140.

[0167] The rear tuning hole 220 of the electroacoustic transducer 200 communicates with the second acoustic output hole 150 via the second resonant cavity 140, forming a cavity structure in which each of the above components is sealed at one end and open at the other. Furthermore, the second resonant cavity 140 and the second acoustic output hole 150 form a second Helmholtz resonance system. In addition, the rear tuning hole 220 communicates with the second acoustic output hole 150 and works in cooperation to achieve a tuning effect.

[0168] When the diaphragm of the electroacoustic transducer 200 vibrates, the diaphragm can radiate sound into the second resonant cavity 140 so that the sound is sequentially radiated to the outside through the tuning hole 220, the second resonant cavity 140, and the second acoustic output hole 150. Based on the sound generation principle of the electroacoustic transducer 200, the phases of the sound emitted from the front and rear of the diaphragm are opposite. In this embodiment, sound emitted from the front of the diaphragm of the electroacoustic transducer 200 can be radiated by the end face hole 120 of the first Helmholtz resonance system, and sound emitted from the rear of the diaphragm of the electroacoustic transducer 200 can be radiated by the second acoustic output hole 150 of the second Helmholtz resonance system. By adjusting the parameters of members such as the first resonant cavity, the second resonant cavity, the first acoustic output hole, the end face hole, the second acoustic output hole, and the passage between the first resonant cavity and the end face hole, and the passage between the second resonant cavity and the acoustic output hole, the phase of the sound signals emitted by the end face hole 120 and the second acoustic output hole 150 is reversed.

[0169] Based on the above theory, the end face hole 120 and the second acoustic output hole 150 constitute a dual-pole sound source within a predetermined frequency range. By installing a dual-pole sound source, the sound from the distant sound field is reduced, achieving the objective of preventing sound leakage from the headphones, improving headphone privacy, and protecting user privacy. In this way, the headphones provided by the embodiment of this disclosure can solve the problem of headphone sound leakage while also taking into consideration the problem of breathability.

[0170] It should be understood that the end face hole 120 communicates with the first resonant cavity 300 via the communication passage 130, so the sound emitted from the end face hole 120 is referred to as the sound emitted from the front of the diaphragm of the electroacoustic transducer 200. At the same time, the second acoustic output hole 150 communicates with the second resonant cavity 140 located behind the diaphragm of the electroacoustic transducer 200, so the sound emitted from the second acoustic output hole 150 is referred to as the sound emitted from the rear of the diaphragm of the electroacoustic transducer 200.

[0171] In this embodiment, the shapes of the first acoustic output hole 110, the end face hole 120, and the second acoustic output hole 150 may be circular, but are not limited to circular shapes. They may include, for example, one or more of elliptical, coarse, triangular, rectangular, polygonal, or other complex shapes with decorative properties, and are not limited thereto in this disclosure.

[0172] Continuing to refer to Figure 25, the end face hole 120 and the second acoustic output hole 150 are spaced apart, and exemplary, the minimum radial distance of the electroacoustic transducer 200 between the end face hole 120 and the second acoustic output hole 150 is between 7 millimeters (mm) and 28 millimeters (mm). That is, the distance between the end face hole 120 and the second acoustic output hole 150 refers to the size in the vertical direction in Figure 25. Here, the minimum radial distance of the electroacoustic transducer 200 between the end face hole 120 and the second acoustic output hole 150 is 8 millimeters (mm), 10 millimeters (mm), 15 millimeters (mm), 20 millimeters (mm), or 28 millimeters (mm).

[0173] If the minimum radial distance between the end face hole 120 and the second acoustic output hole 150 of the electroacoustic transducer 200 is less than 7 millimeters (mm), the distance between the end face hole 120 and the second acoustic output hole 150 will be too small, causing the sound emitted from the second acoustic output hole 150 to affect the sound emitted from the first acoustic output hole 110, particularly affecting low-frequency sounds, resulting in less low-frequency sound being audible to the human ear and affecting sound quality. If the minimum radial distance between the end face hole 120 and the second acoustic output hole 150 of the electroacoustic transducer 200 is greater than 28 millimeters (mm), the distance between the end face hole 120 and the second acoustic output hole 150 will be too large, resulting in an excessive size for the housing 100. In other words, the distance between the two similar bipolar sound sources will be large, affecting the cancellation of sound in the far-field sound field and reducing the sound leakage prevention effect.

[0174] Therefore, in this embodiment, by setting the minimum radial distance of the electroacoustic transducer 200 between the end face hole 120 and the second acoustic output hole 150 to between 7 mm and 28 mm, it is possible to ensure that the sound emitted from the end face hole 120 and the second acoustic output hole 150 cancels out well in the far-field sound field, reducing sound leakage to the outside of the headphones, avoiding an increase in the size of the housing, and making it easier to carry.

[0175] It should be understood that the housing 100 may be a separate structure. Exemplarily, continuing to refer to Figure 24, the housing 100 may comprise a stand 170 and a case 180, the case 180 covering the stand 170 and detachably connected to the stand 170 so as to form a mounting chamber within the housing 100.

[0176] Combining Figures 24 and 25, the end face hole 120 is installed on the wall of the case 180 opposite to the stand 170, the first acoustic output hole 110 is installed on the wall of the stand 170 opposite to the case 180, and the electroacoustic transducer 200 is installed on the stand 170, facing the first acoustic output hole 110. In this embodiment, a third ring-shaped projection 171 is formed on the wall of the stand 170 facing the case 180, and the third ring-shaped projection 171 surrounds the first acoustic output hole 110. To improve the stability of the electroacoustic transducer 200, the electroacoustic transducer 200 is installed within the area surrounded by the third ring-shaped projection 171 and is fixedly connected to the third ring-shaped projection 171. Furthermore, if the housing 100 includes a stand 170 and a case 180, the ear pad 700 is mounted on the stand 170, and the ear pad 700, stand 170, electroacoustic transducer 200, and head form a first resonant cavity 300.

[0177] In order to maximize the first Helmholtz resonance frequency f1 and the degree of headphone openness, the area of ​​the first acoustic output hole 110 is made larger than the area of ​​the diaphragm of the electroacoustic transducer 200 in the planar direction. In this way, the area of ​​the first acoustic output hole 110 is increased, and the diaphragm of the electroacoustic transducer 200 may be touched by the user.

[0178] In light of this, protection of the diaphragm is typically carried out by installing one or a combination of a metal mesh, sponge, web, or plastic supporter in the first acoustic output hole 110. In one example, the metal mesh, sponge, web, or plastic supporter is fixedly connected to the stand 170 by processes such as adhesive bonding, thermal melting, or ultrasonic bonding. In another example, the metal mesh or web is fixedly connected to the stand 170 by an injection molding process. In yet another example, referring to Figures 32 and 33, a plastic supporter 800 may be formed on the inner wall of the first acoustic output hole 110, and the plastic supporter 800 may extend in a direction opposite to the electroacoustic transducer 200. Alternatively, the plastic supporter 800 may be formed on the stand, and the plastic supporter 800 may extend in a direction opposite to the electroacoustic transducer 200, surrounding the first acoustic output hole 110. Here, the plastic supporter 800 is provided with a through-hole 810 positioned opposite the first acoustic output hole 110, the through-hole 810 and the first acoustic output hole 110 communicating with each other, and the diameter of the through-hole 810 is smaller than the diameter of the first acoustic output hole 110, thus ensuring the acoustic output effect of the headphones while also protecting the diaphragm. When the plastic supporter 800 is installed on a stand, the plastic supporter 800 may be injection molded together with the stand as a single complete part by an injection molding process, thereby simplifying the headphone manufacturing process.

[0179] Alternatively, the first acoustic output holes 110 may be classified separately, that is, multiple holes may be provided in the housing 100, and multiple holes may constitute the first acoustic output holes 110. In this way, the size of each hole is smaller than the first acoustic output holes 110, preventing them from being scratched by external devices.

[0180] In one possible embodiment, the parameters of the first Helmholtz resonance system and the second Helmholtz resonance system are further configured so that the end face hole 120 and the second acoustic output hole 150 can form a bipolar sound source within a predetermined frequency range. In particular, the first Helmholtz resonance system has a first Helmholtz resonance frequency f1, which satisfies the following equation (1).

[0181]

number

[0182] The selection of the cross-sectional area of ​​the second passage 500 depends on the values ​​of the cross-sectional areas of the hollow passage 210, the connecting passage 130, and the end face hole 120. For example, if the cross-sectional areas of the hollow passage 210, the connecting passage 130, and the end face hole 120 are approximately equal, the cross-sectional area of ​​the second passage 500 may be the average of the cross-sectional areas of the hollow passage 210, the connecting passage 130, and the end face hole 120. Furthermore, if the difference between any two of the cross-sectional areas of the hollow passage 210, the connecting passage 130, and the end face hole 120 is large, the smaller cross-sectional area may be selected as the cross-sectional area of ​​the second passage 500. It should be understood that, as is clear from equation (1), the cross-sectional area S1 and the first Helmholtz resonance frequency f1 are directly proportional. In this example, the reason for selecting the smaller cross-sectional area as the cross-sectional area of ​​the second passage 500 is that in actual products, the second passage 500 changes depending on the product model. If the simulation decision is made using the smallest cross-sectional area, as can be seen from the results, the first Helmholtz resonance frequency f1 should be as large as possible and approximately equal to the second Helmholtz resonance frequency f2. As long as these conditions are met, the cross-sectional area of ​​the second passage 500 can be adjusted based on the simulation results. Furthermore, for example, if the length of the connecting passage 130 is large, the cross-sectional area of ​​the hollow passage 210 is selected as the cross-sectional area of ​​the second passage 500.

[0183] At the same time, the second Helmholtz resonance system has a second Helmholtz resonance frequency f2, which satisfies equation (2) below.

number

[0184] As can be seen from equations (1) and (2), the first Helmholtz resonance frequency f1 is related to the cross-sectional area and length of the second passage and the volume of the first resonant cavity. The second Helmholtz resonance frequency f2 is related to the opening area and length of the second acoustic output hole and the volume of the second resonant cavity.

[0185] In order to ensure that the audio signals radiated from the end face hole 120 and the second acoustic output hole 150 satisfy the conditions of a bipolar sound source within a wide frequency band, it is necessary to bring the first Helmholtz resonance frequency f1 and the second Helmholtz resonance frequency f2 as close to high frequencies as possible. For example, by setting the first Helmholtz resonance frequency f1 ≥ 5000 Hz and the second Helmholtz resonance frequency f2 ≥ 5000 Hz, for example, by setting the first Helmholtz resonance frequency f1 and the second Helmholtz resonance frequency f2 to approximately 6000 Hz, the frequency response curves of the end face hole 120 and the second acoustic output hole 150 at these resonance frequencies are made to be approximately the same, and the two frequency response curves have approximate amplitudes and opposite phases. Furthermore, the sound emitted from the end face hole 120 and the second acoustic output hole 150 substantially satisfies the conditions of a bipolar sound source, and furthermore, the sound in the far-field sound field is reduced, achieving the objective of preventing headphone sound leakage and protecting user privacy.

[0186] In order to bring the first Helmholtz resonance frequency f1 as close to a high frequency as possible, the cross-sectional area and length of the second passage 500 and the volume of the first resonance cavity are rationally set in the embodiments of this disclosure. In one example, referring again to Figure 25, the hollow passage 210, the communication passage 130 and the end face hole 120 together regulate the second passage 500, and the length of the second passage 500 is 43 millimeters or less. For example, the length of the second passage 500 is 10 millimeters, 15 millimeters, 20 millimeters, 25 millimeters, 30 millimeters, 40 millimeters or 43 millimeters. As can be understood, the length of the second passage 500 refers to the size of the second passage 500 along the axial direction of the electroacoustic transducer 200.

[0187] In order to ensure that the audio signals radiated from the end face hole 120 and the second acoustic output hole 150 satisfy the conditions of a bipolar sound source within a wide frequency band, the resonant frequencies f1 of the first Helmholtz resonant system and f2 of the second Helmholtz resonant system should be made as large as possible so that f1 and f2 are as close to high frequencies as possible. Therefore, the length of the second passage 500 needs to be designed to be as short as possible. In addition, shortening the second passage 500 can improve conductivity between the first resonant cavity 300 and the external environment, thereby improving the comfort of the user's ear.

[0188] The volume of the first resonant cavity 300 is 55 cubic centimeters (cm³) or less. For example, if the volume of the first resonant cavity 300 is 55 cubic centimeters (cm³), 53 cubic centimeters (cm³), 50 cubic centimeters (cm³), or 45 cubic centimeters (cm³), as is clear from equation (1), the resonant frequency f1 of the first Helmholtz resonant system is inversely proportional to the volume of the first resonant cavity 300. Therefore, if the volume of the first resonant cavity 300 is small, the resonant frequency f1 of the first Helmholtz resonant system will approach a higher frequency.

[0189] The minimum cross-sectional area of ​​the hollow passage 210 of the electroacoustic transducer 200 must be sufficiently large, where the minimum cross-sectional area of ​​the hollow passage 210 is 5 square millimeters (mm2) or more, more preferably 10 square millimeters (mm2) or more, and even more preferably 20 square millimeters (mm2) or more.

[0190] The minimum cross-sectional area of ​​the communication passage 130 is 5 square millimeters (mm2) or more, more preferably 10 square millimeters (mm2) or more, and even more preferably 20 square millimeters (mm2) or more.

[0191] The minimum area of ​​the end face hole 120 is 15 square millimeters (mm2) or more, more preferably 25 square millimeters (mm2) or more, and even more preferably 40 square millimeters (mm2) or more.

[0192] In this embodiment, the cross-sectional areas of the hollow passage 210, communication passage 130, and end face hole 120 of the electroacoustic transducer 200 provided can be rationally selected and adjusted so that the first Helmholtz resonance frequency f1 is as close to a high frequency as possible.

[0193] Furthermore, in order to bring the second Helmholtz resonance frequency f2 as close to a high frequency as possible, the embodiments of this disclosure rationally limit the volume of the second resonance cavity 140, the opening area of ​​the second acoustic output hole 150, and the length of the second acoustic output hole 150.

[0194] Exemplary, the volume of the second resonant cavity 140 is between 6 cubic centimeters (cm³) and 55 cubic centimeters (cm³), for example, the volume of the second resonant cavity 140 is 6 cubic centimeters (cm³), 10 cubic centimeters (cm³), 15 cubic centimeters (cm³), 20 cubic centimeters (cm³), 25 cubic centimeters (cm³), 30 cubic centimeters (cm³), 35 cubic centimeters (cm³), 40 cubic centimeters (cm³), 45 cubic centimeters (cm³), 50 cubic centimeters (cm³), or 55 cubic centimeters (cm³). Preferably, the volume of the second resonant cavity 140 is 40 cubic centimeters (cm³). This not only ensures that the second Helmholtz resonance frequency f2 is as close to a high frequency as possible, but also makes it easy to adjust it to be approximately the same as the first Helmholtz resonance frequency f1. This reduces the sound of distant sound fields, prevents headphone sound leakage, and protects the user's privacy. It also avoids the volume of the second resonant cavity 140 becoming excessive, thus ensuring the compactness and small size of the headphones.

[0195] The opening area of ​​the second acoustic output hole 150 is 15 square millimeters (mm²) or more. Along the axial direction of the electroacoustic transducer 200, the length of the second acoustic output hole is between 1 millimeter (mm) and 55 millimeters (mm). The opening area of ​​the second acoustic output hole 150 is directly proportional to the second Helmholtz resonance frequency f², and the length of the second acoustic output hole 150 is inversely proportional to the second Helmholtz resonance frequency f². The larger the opening area of ​​the second acoustic output hole 150, and the smaller the length of the second acoustic output hole 150, the closer the second Helmholtz resonance frequency f² can be to a higher frequency, making it easier to adjust it to be approximately the same as the first Helmholtz resonance frequency f1. This creates an overlap of out-of-phase sound fields in the far-field sound field of the headphones, reducing the volume and clarity of the sound, preventing other people far away from the headphones from clearly hearing the sound emitted by the headphones, thus achieving the objective of preventing sound leakage from the headphones and protecting the user's privacy.

[0196] In this embodiment, by setting the parameters as described above, the first Helmholtz resonance frequency f1 and the second Helmholtz resonance frequency f2 can be made approximately equal, and |f1-f2|≦300Hz. For example, the first Helmholtz resonance frequency f1 and the second Helmholtz resonance frequency f2 are approximately 1000Hz.

[0197] In order to better explain the need to adjust the parameters in the first and second Helmholtz resonance systems in this embodiment, the following detailed explanation will be provided by combining two frequency response curve diagrams.

[0198] Figure 26 shows the frequency response curves of the sound emitted from the end face hole 120 and the sound emitted from the second acoustic output hole 150 before the parameters are adjusted. As is clear from Figure 26, the first Helmholtz resonance frequency f1 is approximately 1000 Hz, and the second Helmholtz resonance frequency f2 is approximately 2200 Hz. Within the frequency response bandwidths centered at f1 and f2, for example, the frequency response with a frequency response bandwidth of 600 Hz to 1600 Hz (a0-a1) centered at f1 and the frequency response with a frequency response bandwidth of 1000 Hz to 4000 Hz (b0-b1) centered at f2 have a very large difference in amplitude. Therefore, the frequency response curves of the end face hole 120 and the second acoustic output hole 150 cannot satisfy the condition that the amplitudes are approximately the same and the phases are inverse in several frequency bands, and thus the end face hole 120 and the second acoustic output hole 150 cannot constitute a bipolar sound source within a predetermined frequency range.

[0199] Figure 27 shows the frequency response curves of the sound emitted from the end face hole 120 and the sound emitted from the second acoustic output hole 150 after the parameters have been adjusted. After adjustment, the second Helmholtz resonance frequency f2 in the frequency response curve emitted from the second acoustic output hole approaches 1000 Hz, and the frequency response of the frequency response bandwidth 600 Hz to 1600 Hz (b0'-b1') with f2 as the center frequency approaches the amplitude of the frequency response bandwidth 600 Hz to 1600 Hz (a0-a1) with f1 as the center frequency, thus forming a bipolar sound source. As the amplitudes of the frequency responses of the frequency response bandwidths with frequencies f1 and f2 as the center frequencies become closer, it is necessary to limit the difference between f1 and f2 to a small amount, i.e., |f1-f2|≦300 Hz.

[0200] Therefore, after adjusting the parameters in the first Helmholtz resonance system and the second Helmholtz resonance system, the condition that the first Helmholtz resonance frequency f1 and the second Helmholtz resonance frequency f2 are approximately the same is satisfied. Furthermore, the end face hole 120 and the second acoustic output hole 150 constitute a bipolar sound source in the frequency range of 200 to 10000 Hz, which reduces the sound generated in the far-field sound field by the headphones and improves the headphones' ability to prevent sound leakage.

[0201] As one possible embodiment of the communication passage 130, referring again to Figure 25, the housing 100 further comprises an outer wall 160, with the outer wall 160 and the electroacoustic transducer 200 installed facing each other. The wall surface of the outer wall 160 that faces the electroacoustic transducer 200 needs to be understood specifically according to the shape of the electroacoustic transducer 200. For example, if the electroacoustic transducer 200 is cylindrical, the outer wall 160 may be a wall surface facing the bottom and top surfaces of the electroacoustic transducer 200, or a wall surface facing the outer circumferential surface of the electroacoustic transducer 200. To facilitate a detailed explanation of the outer wall 160, all of the following embodiments will be described using examples where the outer wall 160 faces the bottom and top surfaces of the electroacoustic transducer 200.

[0202] An end face hole 120 is installed in the outer wall 160 and penetrates the outer wall 160 along the thickness direction of the outer wall 160. A first ring-shaped projection 161 is formed on the outer wall 160, surrounding the end face hole 120 and projecting toward the hollow passage 210. The end of the first ring-shaped projection 161 opposite the outer wall 160 is connected to the electroacoustic transducer 200, such that the area surrounded by the inner wall of the first ring-shaped projection 161 becomes the communication passage 130, and the first ring-shaped projection 161, the electroacoustic transducer 200, and the remaining area of ​​the outer wall 160 surround the second resonant cavity 140. Furthermore, the end of the first ring-shaped projection 161 opposite the outer wall may be sealed with the electroacoustic transducer 200 by a material such as double-sided tape, adhesive, or a sealing ring, so that the communication passage 130 faces at least a portion of the hollow passage 210 of the electroacoustic transducer 200. This allows the end face hole 120 to communicate with the hollow passage 210 via the communication passage 130, thereby enabling air communication between the hollow passage 210 and the external environment.

[0203] In this embodiment, the first ring-shaped projection 161 and the outer wall 160 may be integrally molded or may be separate structures. If the first ring-shaped projection 161 and the outer wall 160 are integrally molded, the connection strength between the outer wall 160 and the first ring-shaped projection 161 can be improved, which not only improves the structural strength of the housing 100 but also simplifies the manufacturing process of the housing 100. If the first ring-shaped projection 161 and the outer wall 160 are separate structures, the position of the first ring-shaped projection 161 can be set as needed, and the size of the space between the communication passage 130 and the second resonant cavity 140 can be rationally adjusted.

[0204] In this embodiment, by restricting the communication passage 130 with the first ring-shaped projection 161 installed on the outer wall 160, the location and size of the area of ​​the communication passage are precisely restricted, enabling airflow between the end face hole 120 and the hollow passage 210, releasing heat from inside the headphones, and keeping the ear area comfortable.

[0205] It should be understood that in order to maximize the first Helmholtz resonance frequency f1, the second passage 500 should be made as short as possible. For example, the height of the first ring-shaped projection is 0 millimeters (mm), meaning that at least the area of ​​the outer wall 160 of the housing 100 facing the electroacoustic transducer 200 is installed in contact with the electroacoustic transducer 200, but it should be understood that the side wall of this part should not obstruct the rear tuning hole 220 of the electroacoustic transducer 200.

[0206] As another possible embodiment of the communication passage 130, referring to Figure 28, the housing 100 further comprises an outer wall 160 installed opposite the electroacoustic transducer 200, with the end face hole 120 installed in the outer wall 160.

[0207] The headphones further comprises an intermediate housing 400, which covers the electroacoustic transducer 200 so as to be understood, the intermediate housing 400 is positioned between the electroacoustic transducer 200 and the outer wall 160 and covers the electroacoustic transducer 200, thereby restricting the intermediate housing passage 410 and the second resonant cavity 140, which do not communicate with each other. As one possible example of the intermediate housing 400, continuing to refer to Figure 28, the intermediate housing 400 may be a cylindrical body with one end open, so that the electroacoustic transducer 200 can be placed in the chamber of the intermediate housing 400. Exemplarily, the intermediate housing 400 comprises an intermediate housing bottom wall 430 and a ring-shaped intermediate housing side wall 440, the intermediate housing side wall 440 being positioned on the side of the intermediate housing bottom wall 430 facing the electroacoustic transducer 200, and together with the intermediate housing bottom wall 430 surrounding the intermediate housing passage 410. The end of the intermediate housing side wall 440 opposite to the intermediate housing bottom wall 430 may be connected to the inner wall of the housing 100 or to the electroacoustic transducer 200. For example, the end of the intermediate housing side wall 440 opposite to the intermediate housing bottom wall 430 may be connected to the inner wall of the housing 100, in which case it is possible to ensure that the intermediate housing passage 410 is completely covered by the electroacoustic transducer 200 and the area of ​​the intermediate housing passage 410 can be increased.

[0208] To enable communication between the intermediate housing passage 410 and the end face hole 120, a communication hole 420 is provided in the intermediate housing 400 that communicates with the intermediate housing passage 410. For example, the communication hole 420 is provided in the intermediate housing bottom wall 430, and the communication hole 420 penetrates the intermediate housing bottom wall 430 along the thickness direction of the intermediate housing bottom wall 430 such that one end of the communication hole 420 communicates with the intermediate housing passage 410 and the other end of the communication hole 420 communicates with the end face hole 120.

[0209] The intermediate housing passage 410 and the communication hole 420 restrict the communication passage 130. In this example, by adding an intermediate housing 400 and using the intermediate housing passage 410 and communication hole 420 of the intermediate housing 400 to restrict the communication passage 130, the shape of the intermediate housing 400 can be adjusted as needed, and the area of ​​the communication passage 130 can be adjusted, which is equivalent to rationally adjusting the area of ​​the second passage in the first Helmholtz resonant system. The process by which the sound emitted from the front of the diaphragm of the electroacoustic transducer 200 is radiated by the end face hole 120 of the first Helmholtz resonant system optimizes the standing wave frequency and resonant frequency emitted by the end face hole 120, and further optimizes the frequency response curve of the sound signal emitted by the headphones. This reduces sound in the far-field, achieves the goal of reducing headphone sound leakage, improves headphone privacy, and protects user privacy.

[0210] The intermediate housing passage 410 may be the entire chamber of the intermediate housing 400 or a part of the chamber. For example, referring to Figures 28, 29, and 30, the intermediate housing 400 includes an intermediate housing bottom wall 430 installed opposite the electroacoustic transducer 200, and as understood, the intermediate housing bottom wall 430 is installed opposite the outer wall 160, and the intermediate housing bottom wall 430 and the outer wall 160 may be installed joined together or spaced apart. For example, the intermediate housing bottom wall 430 and the outer wall 160 are bonded together, eliminating any gaps between them. In this way, heat inside the housing 100 is transferred (or propagated) to the communication hole 420 and quickly diffused to the external environment through the end face hole 120. This shortens the length of the transfer (or propagation) path between the hollow passage 210 and the end face hole 120, preventing heat from accumulating inside the headphones and improving the lifespan of each part of the headphones and the comfort of the user's ears.

[0211] Furthermore, the bonding of the intermediate housing bottom wall 430 and the outer wall 160 may also involve using the outer wall 160 to support the intermediate housing bottom wall 430, thereby improving the contact area between the intermediate housing bottom wall 430 and the outer wall 160, and further improving the connection strength between the intermediate housing 400 and the housing 100.

[0212] A second ring-shaped projection 450 is formed on the bottom wall 430 of the intermediate housing, surrounding the communication hole 420 and projecting toward the hollow passage 210. The second ring-shaped projection 450 restricts the intermediate housing passage 410. In other words, the second ring-shaped projection 450 acts as a separator, dividing the area enclosed by the bottom wall 430 and the side wall 440 of the intermediate housing into two parts. The part of the intermediate housing passage 410 that is positioned opposite the hollow passage 210 is the intermediate housing passage 410. In this way, the size of the intermediate housing passage 410 in the axial direction perpendicular to the electroacoustic transducer 200, i.e., in the vertical direction in Figure 29, can be shortened. Furthermore, the length of the transmission (or propagation) path between the hollow passage 210 and the end face hole 120 can be shortened, allowing heat inside the housing 100 to be quickly dissipated to the external environment through the end face hole 120. On the other hand, heat accumulation inside the headphones can be avoided, improving the lifespan of each part of the headphones. On the other hand, heat inside the headphones can be quickly released, keeping the ear area comfortable.

[0213] Continuing to refer to Figures 29 and 30, the end of the second ring-shaped projection 450 facing the electroacoustic transducer 200 is connected to the electroacoustic transducer 200. For example, the end of the second ring-shaped projection 450 facing the electroacoustic transducer 200 may be sealed to the electroacoustic transducer 200 by a material such as double-sided tape, adhesive, or a sealing ring. The connection position between the second ring-shaped projection 450 and the electroacoustic transducer 200 may be close to the hollow passage 210 of the electroacoustic transducer 200, or it may be a predetermined distance between the hollow passage 210 of the electroacoustic transducer 200, so as to reasonably adjust the size of the intermediate housing passage 410 in the axial direction perpendicular to the electroacoustic transducer 200 and further change the area of ​​the intermediate housing passage 410.

[0214] Referring to Figures 28 and 29, when the intermediate housing 400 is installed inside the housing 100, the intermediate housing 400, the electroacoustic transducer 200, and the housing form a relatively sealed space. In order to enable communication between the rear tuning hole 220 of the electroacoustic transducer 200 and the second acoustic output hole 150, an acoustic output communication hole 460 is usually installed in the intermediate housing 400, and communication between the rear tuning hole 220 and the second acoustic output hole 150 is achieved through the acoustic output communication hole 460.

[0215] The installation position of the acoustic output communication hole 460 may be rationally designed in accordance with the installation positions of the second resonant cavity 140 and the second acoustic output hole 150.

[0216] In one example, referring to Figure 30, the second resonant cavity 140 is formed by a chamber in part of the intermediate housing 400. For example, the second resonant cavity 140 is formed by the second ring-shaped projection 450 being surrounded by the intermediate housing side wall 440 and the intermediate housing bottom wall 430 of the intermediate housing 400, and the second acoustic output hole 150 is installed in the region of the outer wall 160 of the housing 100 that faces the second resonant cavity 140. Correspondingly, an acoustic output communication hole 460 is installed in the intermediate housing bottom wall 430 that communicates with the second resonant cavity 140, and the acoustic output communication hole 460 communicates with the second acoustic output hole 150. To ensure that the rear tuning hole 220 of the electroacoustic transducer 200 communicates with the second acoustic output hole 150 via the second resonant cavity 140 and the acoustic output communication hole 460, one end of the acoustic output communication hole 460 communicates with the rear tuning hole 220 via the second resonant cavity 140, and the other end of the acoustic output communication hole 460 communicates with the second acoustic output hole 150. Thus, the above components form a cavity structure in which one end is sealed and the other end is open, and the second resonant cavity 140 and the second acoustic output hole 150 form a second Helmholtz resonance system.

[0217] This embodiment allows for a reduction in the length of the transmission (or propagation) path in the second Helmholtz resonance system. The process by which sound emitted from the rear of the diaphragm of the electroacoustic transducer 200 is radiated through the second acoustic output port 150 of the second Helmholtz resonance system optimizes the standing wave frequency and resonant frequency generated by the second acoustic output port 150, and further optimizes the frequency response curve of the sound signal generated by the headphones. This reduces the sound in the distant sound field, achieving the objective of preventing headphone sound leakage, improving headphone privacy, and protecting user privacy.

[0218] In another example, referring to Figures 28 and 29, the second resonant cavity 140 may consist of a chamber in part of the intermediate housing 400 and a chamber in part of the housing 100. Exemplarily, a portion of the outer wall of the housing 100 is positioned opposite the electroacoustic transducer 200 in its axial direction. Alternatively, the outer wall of the housing 100 comprises a first portion positioned opposite the electroacoustic transducer 200 in its axial direction and a second portion connected to the first portion, wherein the second portion is positioned at an inclination with respect to the first portion and the angle between the second portion and the first portion is obtuse.

[0219] At this time, when the second acoustic output hole 150 is installed in the second part, the acoustic output communication hole 460 is opened on the intermediate housing side wall 440 in correspondence, thereby connecting the two parts of the second resonant cavity 140 with the acoustic output communication hole 460.

[0220] When the second acoustic output hole 150 is installed in the first portion, the corresponding acoustic output communication hole 460 is installed in the bottom wall 430 of the intermediate housing, and the acoustic output communication hole 460 is installed opposite the second acoustic output hole 150 and overlaps with it to at least a part. In this embodiment, since the acoustic output communication hole 460 and the second acoustic output hole 150 share the same axis of the same center, the size of the passage from the intermediate housing passage 410 to the external environment is minimized.

[0221] In this embodiment, the cross-sectional area of ​​the region surrounded by the second ring-shaped projection 450 is greater than or equal to the cross-sectional area of ​​the hollow passage 210. By increasing the cross-sectional area of ​​the region surrounded by the second ring-shaped projection 450, the cross-sectional area of ​​the second passage 500 is increased, and the first Helmholtz resonance frequency f1 is increased as much as possible.

[0222] The smaller the distance between the center point of the end face hole 120 and the central axis of the hollow passage 210 of the electroacoustic transducer 200, the better. In this way, the length of the second passage 500 can be reduced. Preferably, the distance between the center point of the end face hole 120 and the central axis of the hollow passage 210 of the electroacoustic transducer 200 is 0 mm to 36 mm, more preferably 0 to 20 mm, and even more preferably 0 to 5 mm, which shortens the distance between the end face hole 120 and the hollow passage 210.

[0223] In one possible embodiment, referring to Figure 31, the headphones further comprise an opening / closing assembly 600, which is installed on the electroacoustic transducer 200 and opens or closes the hollow passage 210. As understood, the opening / closing assembly 600 is used to open or close the hollow passage 210. As understood, when the opening / closing assembly 600 is closed, the first acoustic output hole 110 and the end face hole 120 are not in communication. When the opening / closing assembly 600 is open, the first acoustic output hole 110 can communicate with the external environment by communicating with the end face hole 120 through the hollow passage 210.

[0224] Furthermore, the opening / closing assembly 600 can be installed not only on the electroacoustic transducer 200, but may also be installed in other locations. For example, the opening / closing assembly 600 may be installed on the housing 100. For instance, the opening / closing assembly 600 may be installed on one side of the first acoustic output hole 110, opening or closing the first acoustic output hole 110. In this way, the opening and closing of the first acoustic output hole 110 can switch the communication between the first acoustic output hole 110 and the external environment on or off. Moreover, for example, the opening / closing assembly 600 may be installed on one side of the end face hole 120, opening or closing the end face hole 120, thus switching the communication between the first acoustic output hole 110 and the external environment on or off.

[0225] To enable the opening or closing function of the opening / closing assembly 600, a connecting mechanism (not shown) is further installed on the housing 100. One end of the connecting structure is located outside the housing 100, and the other end of the connecting mechanism is connected to the opening / closing assembly 600, for example, to a vane of the opening / closing assembly 600. The user can open or close the opening / closing assembly 600 by driving the connecting mechanism, thereby switching between the open and closed states of the headphones.

[0226] In some other embodiments, the transport mechanism may be connected to an electric motor that drives the transport mechanism to open or close the opening / closing assembly 600, for example, the electric motor can receive commands issued by the headphone's main control chip and control the opening or closing of the opening / closing assembly 600.

[0227] Each example or embodiment described herein is explained in an incremental manner, primarily describing the differences between each example and the others, with references to the same or similar parts within each example.

[0228] It should be noted that phrases such as "one embodiment," "example," "exemplary embodiment," and "several embodiments" used in the specification mean that the above embodiments may include certain features, structures, or characteristics, but not all embodiments necessarily include those same features, structures, or characteristics. Furthermore, such wording does not necessarily refer to the same embodiment. Moreover, when combining specific features, structures, or characteristics described in the embodiments, it is within the knowledge of those skilled in the art to achieve such features, structures, or characteristics by combining them with other embodiments, whether explicitly stated or not.

[0229] Finally, it should be noted that the above embodiments are not intended to limit the technical solutions of the Disclosure, but merely to illustrate them. Although the Disclosure has been described in detail with reference to the above embodiments, those skilled in the art will understand that it is still possible to modify the technical solutions described in the above embodiments or to make equivalent substitutions to some or all of their technical features, and that such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the Disclosure.

Claims

1. An electroacoustic transducer having a hollow passage that penetrates along its own axial direction, comprising a vibration system and a magnetic circuit system, The vibration system comprises a diaphragm surrounding the hollow passage, a first voice coil connected to the diaphragm and surrounding the hollow passage, and a second voice coil connected to the diaphragm and surrounding the outer circumference of the first voice coil. The electroacoustic transducer is characterized in that the magnetic circuit system has a magnetic gap, at least a portion of the first voice coil and at least a portion of the second voice coil are located within the magnetic gap, and the magnetic circuit system drives the motion of the first voice coil and the second voice coil to vibrate the diaphragm and generate sound.

2. The electroacoustic transducer according to claim 1, wherein the diaphragm has an inner surround, a first flat portion, a protruding dome, a second flat portion, and an outer surround, the inner surround surrounds the hollow passage, and the inner surround, the protruding dome, and the outer surround all protrude outward from the same side of the first flat portion, the first voice coil is connected to the first flat portion, and the second voice coil is connected to the second flat portion.

3. The electroacoustic transducer according to claim 2, characterized in that the ratio of the orthographic projection area of ​​the protruding dome on the first reference plane to the orthographic projection area of ​​the entire diaphragm on the first reference plane is between 0.2 and 0.7, and the first reference plane is perpendicular to the axial direction of the electroacoustic transducer.

4. The electroacoustic transducer according to claim 2, characterized in that the protruding dome has an arc-shaped structure or a planar structure that protrudes outward.

5. The electroacoustic converter according to claim 3, characterized in that the ratio of the orthographic projection area of ​​the outer surround on the first reference plane to the orthographic projection area of ​​the entire diaphragm on the first reference plane is between 0.2 and 0.

35.

6. The electroacoustic converter according to claim 3, characterized in that the ratio of the orthographic projection area of ​​the inner surround on the first reference plane to the orthographic projection area of ​​the entire diaphragm on the first reference plane is between 0.1 and 0.

2.

7. The electroacoustic converter according to claim 2, characterized in that the inner surround has an arc-shaped structure protruding outward, and / or the outer surround has an arc-shaped structure protruding outward.

8. The electroacoustic converter according to claim 2, characterized in that a pattern structure is installed in the inner surround and / or the outer surround.

9. The electroacoustic transducer according to claim 2, characterized in that the inner surround, the protruding dome, and the outer surround, and the first voice coil and the second voice coil are located on different sides of the first flat portion.

10. The frame further comprises a ring-shaped inner wall of the frame that restricts the hollow passage and a ring-shaped outer wall of the frame that surrounds the inner wall of the frame. The electroacoustic transducer according to claim 2, wherein the diaphragm further comprises a first connecting portion and a second connecting portion, the first connecting portion being connected to the inner surround and surrounding the hollow passage, the second connecting portion surrounding and connecting to the outer surround, the first connecting portion being connected to the inner wall of the frame, and the second connecting portion being connected to the outer wall of the frame.

11. The electroacoustic transducer according to claim 10, characterized in that the ratio of the minimum diameter of the inner wall of the frame to the maximum diameter of the outer wall of the frame is between 0.1 and 0.

5.

12. The electroacoustic transducer according to claim 10, further comprising a first fixing ring for fixedly connecting the first connection portion and the inner wall of the frame, and a second fixing ring for fixedly connecting the second connection portion and the outer wall of the frame.

13. The ratio of the maximum outer diameter of the second fixing ring to the maximum outer diameter of the outer wall of the frame is between 0.7 and 1. The electroacoustic transducer according to claim 12, characterized in that the ratio of the minimum inner diameter of the first fixing ring to the maximum outer diameter of the outer wall of the frame is between 0.1 and 0.

5.

14. The electroacoustic transducer according to claim 10, characterized in that the magnetic circuit system comprises a first magnetic material, the first magnetic material is installed on the frame and surrounds the inner wall of the frame, a first magnetic gap and a second magnetic gap are formed between the first magnetic material and the frame, the first magnetic gap surrounds the inner wall of the frame, the second magnetic gap surrounds the outer circumference of the first magnetic gap, one end of the first voice coil extends to the first magnetic gap, and one end of the second voice coil extends to the second magnetic gap.

15. The electroacoustic transducer according to claim 10, characterized in that the magnetic circuit system comprises a second magnetic body, a third magnetic body, and a fourth magnetic body, each installed on the frame, wherein the second magnetic body surrounds the inner wall of the frame, the third magnetic body surrounds the second magnetic body, the fourth magnetic body surrounds the third magnetic body, a third magnetic gap is formed between the second magnetic body and the third magnetic body, a fourth magnetic gap is formed between the third magnetic body and the fourth magnetic body, one end of the first voice coil extends to the third magnetic gap, and one end of the second voice coil extends to the fourth magnetic gap.

16. The electroacoustic transducer according to claim 10, characterized in that the frame is provided with a rear tuning hole, and the rear tuning hole communicates with the magnetic gap of the magnetic circuit system.

17. The headphones comprising a housing and an electroacoustic transducer according to any one of claims 1 to 16, wherein the electroacoustic transducer is installed in the housing.

18. Further equipped with an opening and closing assembly, The housing has a first acoustic output hole, the first acoustic output hole is located on the side of the housing facing the ear portion, the hollow passage communicates with the first acoustic output hole, the housing further comprises an outer wall installed opposite the electroacoustic transducer, the outer wall has an end face hole that communicates the hollow passage with the external environment, The headphones according to claim 17, characterized in that the opening and closing assembly turns on / off communication between the first acoustic output port and the external environment.

19. The headphones according to claim 18, characterized in that a first cavity is formed in the housing, the first cavity is located between the electroacoustic transducer and the end face hole, and the end face hole communicates with the hollow passage by the first cavity.

20. The headphones according to claim 19, characterized in that the opening and closing assembly is installed in the first cavity of the housing and located at the point of communication between the end face hole and the hollow passage, and switches the communication between the end face hole and the hollow passage on and off.

21. The headphones according to claim 19, characterized in that the distance between the end face hole and the first surface of the electroacoustic transducer facing the end face hole is 0.5 millimeters or more and 10 millimeters or less in the axial direction of the electroacoustic transducer.

22. The orthographic projection of the hollow passage onto the outer wall overlaps at least partially with the end face hole, Alternatively, the headphones according to claim 21, characterized in that the orthographic projection of the hollow passage on the outer wall does not overlap at all with the end face hole.

23. The headphones according to claim 22, characterized in that the distance between the central axis of the end face hole and the central axis of the hollow passage in the radial direction of the electroacoustic transducer is 0 millimeters or more and 36 millimeters or less.

24. The headphones according to claim 19, wherein a first passage is further formed within the first cavity, and the first passage connects the end face hole and the hollow passage.

25. The headphones according to claim 24, wherein the outer wall has a first ring-shaped projection that surrounds the end face hole and protrudes toward the hollow passage, and the first ring-shaped projection restricts the first passage.

26. The headphones according to claim 25, characterized in that the height of the first ring-shaped projection in the direction toward the hollow passage of the first ring-shaped projection is 0 millimeters or more and 10 millimeters or less.

27. The headphones according to claim 24, characterized in that the minimum cross-sectional area of ​​the first passage is equal to or greater than the maximum cross-sectional area of ​​the hollow passage.

28. The headphones according to claim 19, wherein the housing has a first rear acoustic output hole, the first rear acoustic output hole is located on the side of the housing opposite to the ear portion, and the first rear acoustic output hole and the first cavity are in communication.

29. The headphones according to claim 19, further comprising an intermediate housing, wherein the intermediate housing covers the electroacoustic transducer, the intermediate housing and the electroacoustic transducer restrict a second cavity, the second cavity communicates with the hollow passage, a communication hole is provided in the intermediate housing, and the communication hole communicates the second cavity with the end face hole.

30. The headphones according to claim 19, further comprising an intermediate housing, the intermediate housing covering the electroacoustic transducer to restrict a second cavity and a second passage that do not communicate with each other, the second passage communicating with the hollow passage, the intermediate housing having a communication hole communicating with the second passage, and the communication hole communicating with the second passage and the end face hole.

31. The headphones according to claim 30, wherein the intermediate housing includes an intermediate housing bottom wall installed opposite the electroacoustic transducer, the communication hole is installed in the intermediate housing bottom wall, a second ring-shaped projection is formed on the intermediate housing bottom wall surrounding the communication hole and projecting toward the hollow passage, and the second ring-shaped projection restricts the second passage that communicates with the hollow passage.

32. The headphones according to claim 31, characterized in that the height of the second ring-shaped projection in the direction toward the hollow passage of the second ring-shaped projection is 0 millimeters or more and 10 millimeters or less.

33. The headphones according to claim 31, characterized in that the minimum cross-sectional area of ​​the second passage is greater than or equal to the maximum cross-sectional area of ​​the hollow passage.

34. The headphones according to claim 31, wherein the intermediate housing divides the first cavity into a second cavity and a third cavity, the housing is further provided with a second rear acoustic output hole communicating with the third cavity, the second rear acoustic output hole is located on the side of the housing opposite to the ear portion, the intermediate housing is provided with a first acoustic output communication hole, and the first acoustic output communication hole communicates the second cavity and the third cavity.

35. The headphones according to claim 31, characterized in that the bottom wall of the intermediate housing is attached to the outer wall.

36. The headphones according to claim 35, characterized in that the intermediate housing divides the first cavity into a second cavity and a third cavity, a second acoustic output communication hole communicating with the second cavity is provided in the bottom wall of the intermediate housing, a third rear acoustic output hole is provided in the outer wall, and the third rear acoustic output hole communicates with the second acoustic output communication hole.

37. The headphones according to any one of claims 17 to 36, characterized in that the minimum cross-sectional area of ​​the first acoustic output hole is 15 square millimeters or more.

38. The headphones according to any one of claims 17 to 36, characterized in that the orthographic projection of the first acoustic output hole on the first reference plane and the orthographic projection of the hollow passage on the first reference plane overlap at least partially, and the first reference plane is perpendicular to the central axis of the electroacoustic transducer.

39. The headphones according to claim 38, characterized in that the orthographic projection area of ​​the first acoustic output hole on the first reference plane is larger than the orthographic projection area of ​​the hollow passage on the first reference plane.

40. The headphones according to claim 39, wherein the electroacoustic transducer includes a diaphragm having a ring-shaped structure, the diaphragm surrounds the hollow passage, and the orthographic projection of the first acoustic output hole on the first reference plane and the orthographic projection of the diaphragm on the first reference plane overlap at least partially.

41. The headphones according to claim 40, further comprising a protective member having a mesh structure, wherein the protective member is installed in the first acoustic output port.

42. The headphones according to any one of claims 17 to 36, characterized in that the minimum cross-sectional area of ​​the hollow passage is 5 square millimeters or more.

43. The headphones according to any one of claims 17 to 36, characterized in that the minimum cross-sectional area of ​​the end face hole is 15 square millimeters or more.

44. The headphones according to any one of claims 17 to 36, characterized in that a second reference plane is constructed in the three regions of the ear, namely the tragus, antitragus, and antihelix, and the projection of the first acoustic output hole and / or the end face hole along the coronal axis direction on the second reference plane is located in or covers the region formed by the projection of the concha, antihelix, antitragus, and tragus along the coronal axis direction on the second reference plane.

45. There is a first minimum distance between the projection of the hollow passage along the coronal axis direction on the second reference plane and the projection of the ear canal of the ear portion along the coronal axis direction on the second reference plane. The headphones according to claim 44, characterized in that there is a second minimum distance between the projection along the coronal axis direction on the second reference plane of the end face hole and the projection along the coronal axis direction on the second reference plane of the ear canal, and the first minimum distance is less than or equal to the second minimum distance.

46. The opening and closing assembly is installed in the housing and located in the hollow passage of the electroacoustic transducer, and opens or closes the hollow passage. Alternatively, the opening / closing assembly is installed in the housing and located on the side of the first acoustic output hole, and opens or closes the first acoustic output hole. Alternatively, the headphones according to claim 17, wherein the opening and closing assembly is installed in the housing and located on the side of the end face hole, and opens or closes the end face hole.

47. The housing has a first acoustic output hole and an end face hole, the first acoustic output hole is located on the side of the housing facing the ear portion, the first acoustic output hole communicates with the hollow passage, and the end face hole is located on the side of the housing opposite the ear portion, and communicates with the external environment and the hollow passage, respectively. A first resonant cavity is formed on the side of the headphones facing the ear portion, and the first resonant cavity communicates with the first acoustic output hole. When the headphones are worn, the first resonant cavity is covered over the ear portion, and the first resonant cavity communicates with the end face hole via the hollow passage, such that the first resonant cavity, the hollow passage, and the end face hole form a first Helmholtz resonant system. A second resonant cavity is further formed within the housing, and has a second acoustic output port on the side opposite to the ear portion of the housing, the second resonant cavity communicates the rear tuning port of the electroacoustic transducer with the second acoustic output port, and the second resonant cavity and the second acoustic output port form a second Helmholtz resonant system. The headphones according to claim 17, characterized in that the end face hole and the second acoustic output hole constitute a dual-pole sound source within a predetermined frequency range.

48. The headphones according to claim 47, characterized in that the first Helmholtz resonant system has a first Helmholtz resonant frequency f1, and the second Helmholtz resonant system has a second Helmholtz resonant frequency f2, where |f1 - f2| ≤ 300 Hz.

49. The headphones according to claim 47, characterized in that the first Helmholtz resonant system has a first Helmholtz resonant frequency f1, and the second Helmholtz resonant system has a second Helmholtz resonant frequency f2, where f1 ≥ 5000 Hz and f2 ≥ 5000 Hz.

50. The headphones according to claim 48 or 49, characterized in that a communication passage is formed within the housing, and the communication passage connects the hollow passage and the end face hole.

51. The headphones according to claim 50, wherein the housing further comprises an outer wall installed opposite to the electroacoustic transducer, the end face hole is installed in the outer wall, and a first ring-shaped projection is formed on the outer wall surrounding the end face hole and projecting toward the hollow passage, and the first ring-shaped projection restricts the communication passage.

52. The headphones according to claim 51, wherein the housing further comprises an outer wall installed opposite to the electroacoustic transducer, the end face hole is installed in the outer wall, and the headphones further comprises an intermediate housing, the intermediate housing covers the electroacoustic transducer so as to restrict an intermediate housing passage and the second resonant cavity that do not communicate with each other, the intermediate housing passage communicates with the hollow passage, the intermediate housing is provided with a communication hole that communicates with the intermediate housing passage, the communication hole communicates with the end face hole, and the intermediate housing passage and the communication hole restrict the communication passage.

53. The headphones according to claim 52, wherein the intermediate housing comprises an intermediate housing bottom wall installed opposite the electroacoustic transducer, the communication hole is installed in the intermediate housing bottom wall, a second ring-shaped projection is installed on the intermediate housing bottom wall surrounding the communication hole and projecting toward the hollow passage, and the second ring-shaped projection restricts the intermediate housing passage.

54. The headphones according to claim 53, characterized in that the intermediate housing is provided with an acoustic output communication hole that communicates with the second resonant cavity, and the acoustic output communication hole communicates with the second acoustic output hole.

55. The headphones according to claim 54, characterized in that the acoustic output communication hole is installed in the bottom wall of the intermediate housing, and the second acoustic output hole is installed in the region of the outer wall facing the acoustic output communication hole.

56. The headphones according to claim 55, characterized in that the bottom wall of the intermediate housing is attached to the outer wall.

57. The headphones according to any one of claims 50 to 56, characterized in that the hollow passage, the communication passage, and the end face hole together restrict a second passage, and the length of the second passage is 43 millimeters or less.

58. The headphones according to claim 48 or 49, characterized in that the volume of the first resonant cavity is 55 cubic centimeters or less.

59. The headphones according to claim 58, characterized in that the volume of the second resonant cavity is between 6 cubic centimeters and 55 cubic centimeters.

60. The headphones according to claim 57, characterized in that the opening area of ​​the second acoustic output hole is 15 square millimeters or more.

61. The headphones according to claim 58, characterized in that the length of the second acoustic output hole is between 1 millimeter and 55 millimeters along the axial direction of the electroacoustic transducer.

62. The headphones according to claim 48 or 49, characterized in that the minimum radial distance between the end face hole and the second acoustic output hole of the electroacoustic transducer is between 7 millimeters and 28 millimeters.

63. The device comprises a housing, an electroacoustic transducer, and an opening / closing assembly, wherein the electroacoustic transducer is installed within the housing, and the electroacoustic transducer has a hollow passage that penetrates it along its axial direction, the housing has a first acoustic output hole, the first acoustic output hole is located on the side of the housing facing the ear portion, the hollow passage communicates with the first acoustic output hole, the housing further comprises an outer wall installed opposite the electroacoustic transducer, the outer wall has an end face hole, the end face hole communicates the hollow passage with the external environment, The headphones are characterized in that the opening and closing assembly turns on / off communication between the first acoustic output port and the external environment.

64. The device comprises a housing and an electroacoustic transducer, wherein the electroacoustic transducer is installed within the housing, and the electroacoustic transducer has a hollow passage that penetrates it along its own axial direction. The housing has a first acoustic output hole and an end face hole, the first acoustic output hole being located on the side of the housing facing the ear portion, the first acoustic output hole communicating with the hollow passage, and the end face hole being located on the side of the housing opposite the ear portion, and communicating with the external environment and the hollow passage, respectively. A first resonant cavity is formed on the side of the headphones facing the ear portion, the first resonant cavity communicates with the first acoustic output hole, and when the headphones are worn, the first resonant cavity is covered over the ear portion, and the first resonant cavity communicates with the end face hole by the hollow passage such that the first resonant cavity, the hollow passage and the end face hole form a first Helmholtz resonant system. A second resonant cavity is further formed within the housing, and has a second acoustic output port on the side opposite to the ear portion of the housing, the second resonant cavity communicates the rear tuning port of the electroacoustic transducer with the second acoustic output port, and the second resonant cavity and the second acoustic output port form a second Helmholtz resonant system. The headphones are characterized in that the end face hole and the second acoustic output hole constitute a dual-pole sound source within a predetermined frequency range.

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