WO2020147542A1

WO2020147542A1 - Sound producing device and earphone

Info

Publication number: WO2020147542A1
Application number: PCT/CN2019/128434
Authority: WO
Inventors: 侯燕燕; 郭晓冬
Original assignee: 歌尔股份有限公司
Priority date: 2019-01-16
Filing date: 2019-12-25
Publication date: 2020-07-23
Also published as: CN209170614U

Abstract

Disclosed are a sound producing device and an earphone. The sound producing device comprises a shell, a vibration system and a magnetic circuit system. The shell comprises: a mounting part provided with a mounting cavity, the vibration system and the magnetic circuit system being fixed to the mounting cavity, and a rear sound hole being provided on the mounting part; and a rear cavity part connected to the mounting part and provided around the mounting part, the rear cavity part being provided with a rear cavity, the rear cavity being provided around the mounting cavity, and the rear sound hole being respectively connected to the mounting cavity and the rear cavity. The technical solution of the present invention can reasonably use the space of the rear cavity of the whole machine to further optimize the performance of the whole machine.

Description

Sound device and headphones

Technical field

The invention relates to the technical field of sound energy conversion, in particular to a sound generating device and earphones.

Background technique

In the prior art, the back cavity of the earphone is formed between the housing of the single sounding device and the housing of the whole device such as the earphone. This adopts the form of separate design of the single body of the sounding device and the back cavity of the earphone, resulting in a space for the back cavity of the whole device. It can only be used as the rear cavity of a single body, and cannot be used to install other components, so it cannot be maximized. As a result, the performance of the whole machine cannot be optimized, and it cannot provide a better user listening experience.

Summary of the invention

The main purpose of the present invention is to provide a sound generating device, which aims at rationally utilizing the space of the rear cavity of the whole machine and further optimizing the performance of the whole machine.

In order to achieve the above objectives, the sound generating device proposed by the present invention includes a housing, a vibration system and a magnetic circuit system; wherein the housing includes:

A mounting part formed with a mounting cavity, the vibration system and the magnetic circuit system are fixed to the mounting cavity, and a rear sound hole is provided on the mounting part; and

The rear cavity portion is connected to the mounting portion and arranged around the mounting portion, the rear cavity portion is formed with a rear cavity, the rear cavity is arranged around the mounting cavity, and the rear sound holes are respectively connected to the mounting portion Cavity and the rear cavity.

Optionally, the mounting portion includes a first peripheral wall, a connecting wall, and a second peripheral wall, the first peripheral wall is connected to one end of the second peripheral wall through the connecting wall, and the first peripheral wall is located at the The outer peripheral surface of the second peripheral wall is provided on the outside, and the first peripheral wall and the second peripheral wall are respectively located on both sides of the connecting wall, the first peripheral wall, the connecting wall and the second The peripheral wall is jointly enclosed to form the installation cavity, and the rear cavity is provided between the connecting wall and the second peripheral wall.

Optionally, the outer peripheral surface of the rear cavity portion is flush with the outer peripheral surface of the first peripheral wall.

Optionally, the first peripheral wall extends toward the side where the second peripheral wall is located to form an extended peripheral wall, the extended peripheral wall constitutes an outer peripheral wall of the rear cavity portion, and the second peripheral wall constitutes the rear cavity portion The space between the outer peripheral wall and the inner peripheral wall constitutes the rear cavity, the opening of the rear cavity faces away from the connecting wall, and a cover plate is provided on the opening.

Optionally, the mounting cavity includes a first hole portion and a second hole portion, and the inner diameter of the first hole portion is larger than the inner diameter of the second hole portion to form a stepped hole; the first peripheral wall surrounds Forming the first hole, the second peripheral wall is surrounded to form the second hole; the vibration system is fixed to the first hole, and the magnetic circuit system is fixed to the second hole, The connecting wall of the first peripheral wall and the second peripheral wall is provided with the rear sound hole.

Optionally, the installation cavity is provided with openings at both ends, the vibration system and the magnetic circuit system are arranged along the through direction of the installation cavity, and the magnetic yoke of the magnetic circuit system seals the installation cavity One end is open.

Optionally, a damping element is also covered at the rear sound hole.

Optionally, the rear cavity portion has a ring shape or a ring shape with a gap.

Optionally, the mounting portion has a circular shape, and the rear cavity portion has a circular ring shape or a fan ring shape.

The present invention also provides a headset, including a sounding device, the sounding device includes a housing, a vibration system and a magnetic circuit system; wherein the housing includes:

In the present invention, the rear cavity is directly formed on the housing of the single sounding device. The formation of the rear cavity is only related to the housing and does not need to consider the assembly of the complete machine, so the complexity and difficulty of assembly of the complete machine can be reduced. In addition, the rear cavity and the mounting cavity are both formed on the same housing of a single body, making the structure between the rear cavity and the mounting cavity more compact, which can enhance the bass function of the whole machine, thereby improving the sound quality of the whole machine, and is compared with the aforementioned current situation. In terms of structure, it can reduce the space occupation of the whole machine. Furthermore, the space of the whole machine except the sound device can be installed for other parts, and it will not affect the rear cavity. Therefore, the space of the whole machine can be used reasonably and the waste of assembly space of the whole machine can be reduced. Helps realize the miniaturization of products. In addition, on the basis of miniaturization, the volume of the magnetic circuit system and the vibration system itself and the structure of the mounting part are not affected, and the volume of the magnetic circuit system and the distance between the magnetic circuit system and the vibration system can be taken into account. Ensure acoustic performance. In addition, compared to the form of the module structure, the module housing structure of the sound device is omitted, so that the volume of the sound device can be reduced. On the other hand, since the rear cavity is arranged around the mounting portion, and the rear cavity surrounds the mounting cavity in a ring shape, it can ensure that the overall space of the rear cavity is as large as possible while avoiding the concentration of the rear cavity on one side of the mounting portion. The unilateral size of the mounting part is too large, so the adaptability of the annular rear cavity is better.

BRIEF DESCRIPTION

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, without paying any creative work, other drawings can be obtained according to the structures shown in these drawings.

FIG. 1 is a schematic diagram of a part of the structure of an embodiment of a sound generating device of the present invention;

Fig. 2 is an exploded schematic diagram of the sound generating device in Fig. 1;

Fig. 3 is a schematic cross-sectional view of the sound generating device in Fig. 1.

Description of Drawing Symbols:

标号Label	名称 name	标号Label		名称name
1010	外壳 shell	1212	后腔部 Posterior cavity
1111	安装部 Installation Department	121121	后腔 Back cavity
111111	安装腔 Installation cavity	122122	延伸周壁Extended peripheral wall
112112	第一孔部 First hole	123123	盖板 Cover
113113	第二孔部 Second hole	124124	阻尼件 Damping parts
114114	后声孔Back sound hole	21twenty one	振膜 Diaphragm
115115	第一周壁First week wall	22twenty two	音圈 Voice coil
116116	第二周壁 Second wall	3131	导磁轭 Magnetic yoke
117117	限位凸起 Limit bump	3232	中心磁铁 Center magnet
118118	连接壁Connecting wall	3333	中心导磁板Center magnetic plate

The implementation, functional characteristics and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the drawings.

detailed description

The technical solutions in the embodiments of the present invention will be described clearly and completely in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

It should be noted that if there is a directional indicator (such as up, down, left, right, front, back, etc.) in the embodiment of the present invention, the directional indicator is only used to explain a specific posture (as shown in the drawings) The relative positional relationship, movements, etc. between the components shown below). If the specific posture changes, the directional indication changes accordingly.

In addition, if there are descriptions related to "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are for descriptive purposes only, and cannot be understood as instructions or hints Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may include at least one of the features either explicitly or implicitly. In addition, the "and/or" in the full text means that it includes three parallel schemes, taking "A and/or B as an example", including scheme A, scheme B, or schemes that both A and B meet. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of those skilled in the art to achieve. When the combination of technical solutions conflicts with each other or cannot be realized, it should be considered that the combination of such technical solutions does not exist , Nor within the scope of protection required by the present invention.

The present invention provides a sound generating device, which is a single speaker.

In the embodiment of the present invention, as shown in FIGS. 1 to 3, the sound device includes a vibration system, a magnetic circuit system, and an auxiliary system. The vibration system includes a diaphragm 21 and a voice coil 22 combined together. In addition, the vibration system may also include The centering support piece, the diaphragm 21 and the voice coil 22 are respectively combined with the centering support piece. The magnetic circuit system includes a magnetic yoke 31. The central position of the magnetic yoke 31 is provided with an inner magnetic circuit part. The inner magnetic circuit part includes a central magnet 32 and a central magnetic plate 33 arranged on the central magnet 32. The magnetic yoke 31 is It is bowl-shaped, with a gap between the peripheral wall and the inner magnetic circuit part, and the gap is used for placing the voice coil 22. In addition, the magnetic circuit system may also include an outer magnetic circuit part, the outer magnetic circuit part is arranged at the edge position of the magnetic yoke 31, the outer magnetic circuit part includes side magnets arranged at the edge position of the magnetic yoke 31 and side magnets. On the side magnetic guide plate. The auxiliary system includes a housing 10, and the housing 10 is used to house a fixed vibration system and a magnetic circuit system. In addition, the auxiliary system may further include a front cover (not shown in the figure). The front cover is combined with the upper part of the housing 10, and the front cover and the housing 10 are enclosed into a protective frame. Of course, in some cases, the sound generating device may not include the front cover.

Specifically, the housing 10 includes:

The mounting portion 11 is formed with a mounting cavity 111, the vibration system and the magnetic circuit system are fixed in the mounting cavity 111, and the mounting portion 11 is provided with a rear sound hole 114; and

The rear cavity portion 12 is connected to the mounting portion 11 and arranged around the mounting portion 11, the rear cavity portion 12 is formed with a rear cavity 121, the rear cavity 121 is arranged around the mounting cavity 111, and the rear sound hole 114 is respectively connected to the mounting cavity 111 and the rear cavity 121 , That is, the rear acoustic hole 114 connects the magnetic gap with the rear cavity 121.

The housing 10 of the existing sounding device and the whole machine together form the form of a rear cavity 121. Since there is bound to be an installation gap between the housing 10 and the whole machine, it is more difficult to form a closed rear cavity 121 between the two; and, The size of the rear cavity 121 formed in this way is generally large, which results in too much space for the whole machine, which is not conducive to the reduction of the size of the whole machine, and is also not conducive to the rational use of the space of the whole machine.

In order to solve the above problems, in the present invention, the rear cavity 121 is directly formed on the housing 10 of the single sounding device. The formation of the rear cavity 121 is only related to the housing 10 and does not need to consider the assembly of the whole machine, so it can reduce the overall size. The complexity and difficulty of machine assembly. In addition, the rear cavity 121 and the mounting cavity 111 are both formed on the same housing 10 as a single body, so that the structure between the rear cavity 121 and the mounting cavity 111 is more compact, which can enhance the bass function of the whole machine, thereby improving the sound quality of the whole machine, and Compared with the aforementioned existing structure, it can reduce the space occupation of the whole machine. Furthermore, the space of the whole machine except the sound device can be installed for other parts, and it will not affect the rear cavity 121. Therefore, the space of the whole machine can be rationally used and the waste of assembly space of the whole machine can be reduced. Contribute to miniaturization of products. In addition, on the basis of miniaturization, the volume of the magnetic circuit system and the vibration system itself and the structure of the mounting part 11 are not affected, and the volume of the magnetic circuit system and the distance between the magnetic circuit system and the vibration system can be taken into account. In turn, the acoustic performance is guaranteed. In addition, compared to the form of the module structure, the module housing structure of the sound device is omitted, so that the volume of the sound device can be reduced. On the other hand, since the rear cavity portion 12 is arranged around the mounting portion 11, and the rear cavity 121 surrounds the mounting cavity 111 in a ring shape, it is possible to ensure that the overall space of the rear cavity 121 is as large as possible while avoiding the concentration of the rear cavity portion 12 in the installation. One side of the part 11 causes the unilateral size of the mounting part 11 to be too large, so the adaptability of the annular rear cavity part 12 is better.

In an embodiment, the mounting portion 11 includes a first peripheral wall 115, a second peripheral wall 116, and a connecting wall 118. The first peripheral wall 115 is connected to one end of the second peripheral wall 116 through the connecting wall 118, and the first peripheral wall 115 is located at the first peripheral wall. The outer peripheral surface of the second peripheral wall 116 is arranged outside, that is, the first peripheral wall 115 surrounds the second peripheral wall 116, and the first peripheral wall 115 and the second peripheral wall 116 are respectively located on both sides of the connecting wall 118. The side refers to the two sides distributed along the axial direction of the mounting portion 11, which is equivalent to that the first peripheral wall 115 and the second peripheral wall 116 are connected by the connecting wall 118 to form a stepped wall, the first peripheral wall 115 and the connecting wall 118 Together with the second peripheral wall 116, a mounting cavity 111 is formed. The mounting cavity 111 is a hole with two ends open, and the rear cavity 12 is provided between the connecting wall 118 and the second peripheral wall 116. In this embodiment, by arranging the rear cavity portion 12 between the connecting wall 118 and the second peripheral wall 116, it is possible to reduce or prevent the rear cavity portion 12 from protruding outside the first peripheral wall 115, making the overall structure more compact and capable of Ensure that the sound device is miniaturized. Optionally, the outer circumferential surface of the rear cavity portion 12 is flush with the outer circumferential surface of the first circumferential wall 115. The flush arrangement can ensure that the rear cavity portion 12 has a larger volume to form a larger rear cavity 121. It is avoided that the rear cavity portion 12 protrudes from the outer peripheral surface of the mounting portion 11 and the outer size of the housing 10 is too large. In addition, the rear cavity portion 12 may also protrude on the outer peripheral surface of the mounting portion 11 or the like.

In an embodiment, the rear cavity portion 12 and the mounting portion 11 are an integral structure, that is, the housing 10 is an integral structure. Specifically, the first peripheral wall 115 extends toward the side where the second peripheral wall 116 is located to form an extended peripheral wall 122 The extended peripheral wall 122 constitutes the outer peripheral wall of the rear cavity portion 12, the second peripheral wall 116 constitutes the inner peripheral wall of the rear cavity portion 12, the interval between the outer peripheral wall and the inner peripheral wall constitutes the rear cavity 121, and the opening of the rear cavity 121 faces away from the connecting wall 118. The open cover is provided with a cover 123. In this embodiment, since the rear cavity portion 12 and the mounting portion 11 are integrally formed, the installation between the two is eliminated, the installation steps are simplified, and the user's operation is convenient; and, because the rear cavity portion 12 and the mounting portion 11 are integrated There is no need to provide an installation structure between the two parts 11, and there is no installation gap, so the two parts are more compact, which is beneficial to reduce the volume of the housing 10 and realize the miniaturization of the product. Since the rear cavity 121 is annular, it is conceivable that the cover plate 123 covering one end of the rear cavity 121 is also correspondingly annular. In this embodiment, the cover plate 123 is a plastic cover plate 123 or a metal cover plate 123. For example, the cover plate 123 may be a Mylar sheet, and the cover plate 123 is specifically welded or bonded to the rear cavity 12.

In addition, the rear cavity portion 12 and the mounting portion 11 can also be a separate structure, and the two parts are connected to each other to form the housing 10. For example, the rear cavity portion 12 and the mounting portion 11 can be connected by welding, bonding or snap-fitting. And so on.

In one embodiment, the mounting cavity 111 includes a first hole 112 and a second hole 113. The inner diameter of the first hole 112 is larger than the inner diameter of the second hole 113 to form a stepped hole; the first peripheral wall 115 surrounds A first hole 112 is formed, a second hole 113 is surrounded by the second peripheral wall 116; the vibration system is fixed to the first hole 112, the magnetic circuit system is fixed to the second hole 113, and the connecting wall 118 is provided with a rear sound hole 114. In this embodiment, since the first peripheral wall 115 and the second peripheral wall 116 are connected to each other so that the outer peripheral surface formed by the two is stepped, the inner peripheral surface of the two is also set to be stepped, which can be used reasonably The housing 10 is more conducive to the installation and fixation of the vibration system and the magnetic circuit system. On the other hand, since the rear cavity portion 12 is arranged on the outer periphery of the second peripheral wall 116 and is located at the end of the first peripheral wall 115, the installation cavity 111 is correspondingly arranged in a stepped shape, and the rear sound can be directly provided on the connecting wall 118. The hole 114 and the rear sound hole 114 can be opened at any position on the connecting wall 118, which can ensure that the rear sound hole 114 can be connected to the rear cavity 121 and the mounting cavity 111 respectively, without the need for additional positioning members for positioning, so it is convenient The opening of the rear sound hole 114.

Specifically, the installation cavity 111 is opened at both ends, the vibration system and the magnetic circuit system are arranged along the through direction of the installation cavity 111, and the magnetic yoke 31 of the magnetic circuit system seals one end of the opening of the installation cavity 111. Optionally, the magnetic yoke 31 seals the end of the second hole 113, and the magnetic yoke 31 seals one end of the installation cavity 111, avoiding the use of a sealing plate, which not only reduces the cost, but also further reduces volume. In specific implementation, the magnetic yoke 31 has a shape adapted to the open end of the installation cavity 111. For example, the magnetic yoke 31 is generally cylindrical with an open end, and the open end of the magnetic yoke 31 faces the installation cavity 111. The peripheral wall of the magnetic yoke 31 extends into the installation cavity 111 and is attached to the inner peripheral surface of the installation cavity 111. The bottom wall of the magnetic yoke 31 seals and covers the opening end of the installation cavity 111. Optionally, the second peripheral wall 116 is provided with a limiting protrusion 117, and an end of the magnetic yoke 31 close to the first hole 112 abuts against the limiting protrusion 117, so as to restrict the magnetic yoke 31 from excessively extending into the installation Cavity 111. Specifically, a plurality of limiting protrusions 117 are provided on the second peripheral wall 116 and spaced in the circumferential direction, or, a limiting protrusion 117 is provided on the second peripheral wall 116, and the limiting protrusion 117 extends along the first The circumferential direction of the second peripheral wall 116 extends in a ring shape.

Furthermore, the rear sound hole 114 is also covered with a damping member 124. The damping member 124 is in the shape of a sheet, and specifically can be a layer of mesh cloth, or a combination of multiple layers of mesh cloth, or a combination of mesh cloth and sound-transmitting sheet, etc. The material of the sound-transmitting sheet is one of PET, PC, PP or ABS. Kind. The damping effect can be achieved by providing the damping member 124, which can better balance the air pressure inside and outside the rear cavity 121, and optimize the acoustic performance of the sound device. Optionally, the damping member 124 is provided in the rear cavity 121, that is, the damping member 124 is provided on an end of the rear sound hole 114 located in the rear cavity 121, so that the damping member 124 can be replaced only by removing the cover plate 123. The vibration system needs to be removed, which facilitates the disassembly and assembly of the damping member 124. Of course, the damping element 124 may also be arranged in the installation cavity 111. In order to better balance the air pressure of the front and rear chambers 121, a plurality of rear sound holes 114 are provided on the cavity wall of the mounting chamber 111, and the plurality of rear sound holes 114 are arranged at intervals along the circumferential direction of the rear chamber 121. In this embodiment, a damping member 124 is provided in the rear cavity 121. The damping member 124 is annular and covers a plurality of rear sound holes 114 at the same time. By providing a damping member 124 to cover the plurality of rear sound holes 114 at the same time, it is only necessary to Only one damping member 124 can be installed, which can simplify installation. In addition, a plurality of damping members 124 may also be arranged in the rear cavity 121, and each rear acoustic hole 114 is covered with a damping member 124. Specifically, the damping member 124 is integrally injection molded with the housing 10; or the damping member 124 is adhesively fixed to the housing 10.

In one embodiment, the rear cavity portion 12 is a ring with a gap, so the back cavity 121 is also a ring with a gap, and the position of the mounting portion 11 that is not surrounded by the back cavity 12 can be aligned with The machine is connected without affecting the rear cavity 121. Of course, the back cavity 121 can also be a completely closed ring, and the back cavity 121 can also be formed in a complete ring to enlarge the volume of the back cavity 121.

In the above embodiment, the housing 10 of the sound generating device is generally circular. Specifically, the mounting portion 11 is circular, and the mounting cavity 111 is a circular hole; the rear cavity 12 is circular, and the rear cavity 121 is a circular cavity. Or, the rear cavity portion 12 is in a fan ring shape, and the rear cavity 121 is a fan ring cavity. By setting the mounting portion 11 and the mounting cavity to a circular shape, the mounting cavity 111 can reasonably use the space of the mounting portion 11; by setting the rear cavity portion 12 and the rear cavity 121 to be circular or fan-shaped, the rear cavity can also be made circular. The cavity 121 reasonably utilizes the space of the rear cavity portion 12; on the other hand, the shape of the rear cavity portion 12 matches the shape of the mounting portion 11, which can compress the external size of the sound device as much as possible. Optionally, the installation cavity 111 and the rear cavity 121 are coaxially arranged, so that the distance between the rear cavity 121 and the installation cavity 111 is the same everywhere, which is beneficial to the balance of air pressure throughout the rear cavity 121.

The present invention also provides an earphone, which includes the above-mentioned sound emitting device. Since the earphone adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments. Let me repeat them one by one.

The above are only the preferred embodiments of the present invention, and do not limit the scope of the present invention. Under the inventive concept of the present invention, equivalent structural transformations made by using the description and drawings of the present invention, or directly/indirectly applied to other Related technical fields are included in the scope of patent protection of the present invention.

Claims

A sound generating device, characterized by comprising a housing, a vibration system and a magnetic circuit system; wherein the housing includes:

A mounting part formed with a mounting cavity, the vibration system and the magnetic circuit system are fixed to the mounting cavity, and a rear sound hole is provided on the mounting part; and

The rear cavity portion is connected to the mounting portion and arranged around the mounting portion, the rear cavity portion is formed with a rear cavity, the rear cavity is arranged around the mounting cavity, and the rear sound holes are respectively connected to the mounting portion Cavity and the rear cavity.
The sounding device according to claim 1, wherein the mounting portion includes a first peripheral wall, a connecting wall, and a second peripheral wall, and the first peripheral wall is connected to the second peripheral wall through the connecting wall. At one end, the first peripheral wall is located outside the outer peripheral surface of the second peripheral wall, and the first peripheral wall and the second peripheral wall are respectively located on both sides of the connecting wall, the first peripheral wall , The connecting wall and the second peripheral wall are jointly enclosed to form the installation cavity, and the rear cavity portion is provided between the connecting wall and the second peripheral wall.
The sounding device according to claim 2, wherein the outer peripheral surface of the rear cavity portion is flush with the outer peripheral surface of the first peripheral wall.
The sounding device according to claim 2, wherein the first peripheral wall extends toward the side where the second peripheral wall is located to form an extended peripheral wall, and the extended peripheral wall constitutes the outer peripheral wall of the rear cavity, so The second peripheral wall constitutes the inner peripheral wall of the rear cavity portion, the interval between the outer peripheral wall and the inner peripheral wall constitutes the rear cavity, and the opening of the rear cavity faces away from the connecting wall, and in the opening The mouth cover is provided with a cover plate.
The sounding device according to claim 2, wherein the mounting cavity includes a first hole portion and a second hole portion, the inner diameter of the first hole portion is larger than the inner diameter of the second hole portion to form a step Hole; the first peripheral wall is surrounded to form the first hole, the second peripheral wall is surrounded to form the second hole; the vibration system is fixed to the first hole, the magnetic circuit The system is fixed to the second hole, and the rear sound hole is provided on the connecting wall of the first peripheral wall and the second peripheral wall.
The sounding device according to claim 1, wherein the installation cavity is opened at both ends, the vibration system and the magnetic circuit system are arranged along the through direction of the installation cavity, and the magnetic circuit The magnetic yoke of the system seals the opening at one end of the installation cavity.
The sound device according to claim 1, wherein the rear sound hole is further covered with a damping member.
The sound emitting device according to claim 1, wherein the rear cavity portion is ring-shaped or ring-shaped with a gap.
The sound device according to any one of claims 1-8, wherein the mounting portion is circular, and the rear cavity portion is circular or fan-shaped.
A headset, characterized by comprising the sound emitting device according to any one of claims 1-9.