WO2021237837A1

WO2021237837A1 - Sound production device

Info

Publication number: WO2021237837A1
Application number: PCT/CN2020/097136
Authority: WO
Inventors: 曹成铭; 沈凯华; 吴树文; 吴立峰
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2020-05-29
Filing date: 2020-06-19
Publication date: 2021-12-02
Also published as: CN213028516U

Abstract

The present utility model provides a sound production device, comprising a sound production unit. The sound production unit comprises a vibrating diaphragm, and a front cover fixed on a side of the sound production unit that is close to the vibrating diaphragm, with the front cover and the vibrating diaphragm jointly defining a sound outlet cavity. The sound production device further comprises a rear housing fixedly connected to the front cover and arranged around the sound production unit. The front cover comprises a front cover plate partially fixed on the sound production unit, and a sound outlet hole penetrating the front cover plate; and the sound outlet cavity is in communication with the outside by means of the sound outlet hole. The rear housing comprises a rear housing plate spaced apart from the sound production unit, and a rear housing extending wall which is formed by means of bending and extending from the rear housing plate to the front cover along a peripheral side of the sound production unit; the rear housing extending wall is fixedly connected to a bottom surface of the side of the front cover plate close to the vibrating diaphragm, and forms a seal with the front cover plate; and the rear housing and the sound production unit jointly define a rear sound cavity, the sound production unit is provided with a leakage part which is in communication with the rear sound cavity, and the rear housing is provided with a leakage hole enabling the rear sound cavity to be in communication with the outside. Compared with the related art, the sound production device of the present utility model is simple in structure, excellent in acoustic performance and good in user experience effect.

Description

Sound device

Technical field

The utility model relates to the field of electro-acoustic conversion, in particular to a sound-producing device applied to portable mobile electronic products.

Background technique

Sounding devices, also known as speakers, are widely used in portable mobile electronic products, such as mobile phones, to convert audio signals into sound for playback. The sounding devices have high loudness and amplitude.

The related art sounding device includes a basin frame, a vibration system fixed to the basin frame, and a magnetic circuit system with a magnetic gap. The magnetic circuit system drives the vibration system to vibrate and produce sound, and the vibration system includes The diaphragm of the basin frame and a voice coil fixed to the diaphragm and inserted in the magnetic gap to drive the diaphragm to vibrate and produce sound.

technical problem

However, because the related art sound device does not have a rear cavity structure or the rear cavity is an open structure, when used in portable mobile electronic products such as mobile phones, it will cause the problem of mobile phone shell vibration, resulting in poor user experience; and mobile phone space Due to the limited size, the sound emitting device cannot be designed into a speaker box structure with a back cavity in the prior art to overcome this problem.

Therefore, it is necessary to provide a new sound generating device to solve the above technical problems.

Technical solutions

The purpose of the utility model is to provide a sound device with simple structure, good acoustic performance and good user experience.

In order to achieve the above objective, the present invention provides a sound emitting device, which includes a sound emitting monomer including a diaphragm for vibrating and sounding and a cover fixed on the side of the sound emitting monomer close to the diaphragm The front cover, the front cover and the diaphragm jointly enclose a sound emitting cavity; the sound emitting device further includes a rear shell fixedly connected to the front cover and arranged around the sound emitting monomer;

The front cover includes a front cover plate partially pasted and fixed to the sound emitting monomer and a sound hole penetrating through the front cover plate, and the sound hole connects the sound outlet cavity with the outside;

The rear shell includes a rear shell plate spaced apart from the sound emitting unit and a rear shell extension wall bent and extended from the rear shell plate to the front cover along the peripheral side of the sound emitting unit, and the rear shell extends The wall is fixedly connected to the bottom surface of the front cover near the side of the diaphragm and forms a seal with the front cover, the rear shell and the sounding monomer jointly enclose a rear sound cavity, and the sounding monomer A leakage part communicating with the rear acoustic cavity is provided, and the rear shell is provided with a leakage hole penetrating the rear acoustic cavity, and the leakage hole communicates the rear acoustic cavity with the outside.

Preferably, the front cover further includes a sound output plate arranged opposite to the diaphragm and a connecting wall bent and extended from the sound output plate to the diaphragm, and the front cover is formed by the connecting wall The sound outlet is formed by bending and extending, and the sound outlet hole is arranged through the sound outlet plate.

Preferably, the front cover is pressed on the diaphragm.

Preferably, a side of the diaphragm close to the front cover protrudes to form a ring-shaped sealing boss, and the front cover is pressed on the sealing boss to form a seal.

Preferably, both the front cover and the rear shell are made of metal materials.

Preferably, the front cover or the rear case is at least partially used for grounding.

Preferably, the sound generating device further includes a conductive member, one end of the conductive member is connected to the front cover and/or the rear case, and the other end of the conductive member is used for grounding.

Preferably, the conductive member is formed by extending the front cover or the rear shell.

Preferably, the sound emitting device further includes a conductive member, the conductive member includes two electrical pathways, one of the electrical pathways is used to connect the sounding monomer with an external electrical signal, and the other of the electrical pathways The road is used to ground the front cover and/or the rear shell.

Preferably, the sound emitting device further includes at least two positioning pieces, the at least two positioning pieces are connected to opposite sides or two diagonal corners of the rear shell, and the positioning piece is provided at one end away from the rear shell. There is a positioning hole running through it.

Preferably, the positioning piece is formed by extending the rear shell outward.

Preferably, the sound-emitting device further includes a sound-guiding shell covering a side of the front cover away from the rear shell, the sound-guiding shell having a sound-guiding cavity forming a side sound-emitting structure, and the sound-guiding cavity passes through the outlet The sound hole communicates with the sound outlet cavity.

Preferably, the front cover further includes a sound guide cavity forming a side sound emitting structure, and the sound guide cavity communicates with the sound outlet cavity through the sound outlet hole.

Preferably, the sound emitting device further includes a gas-permeable spacer located in the rear acoustic cavity, and the gas-permeable spacer comprises a spacer body arranged opposite to the rear shell plate, and is spaced by the periphery of the spacer body. The spacer extension part bent and extended in the direction of the rear shell plate and the spacer fixing part bent and extended from the end of the spacer extension part away from the spacer body; the spacer extension part and the rear shell extension The walls are arranged at intervals, and the spacer fixing part is fixed to the rear shell plate; the air-permeable spacer and the rear shell jointly enclose a powder filling space.

Preferably, a side of the isolator body close to the sounding unit is recessed in a direction away from the sounding unit to form an avoiding step, and the avoiding step is arranged directly opposite to the leakage portion.

Preferably, both the front cover and the rear shell are made of 0.15mm thick steel sheet.

Preferably, the sound-producing unit further includes a basin frame, the diaphragm is attached and fixed to the basin frame, the front cover is fixed on a side of the basin frame close to the diaphragm, and the rear shell extends wall Surrounding the peripheral side of the basin frame; the thickness of the extension wall of the rear shell is less than the thickness of the basin frame; the extension wall of the rear shell and at least one side of the basin frame are provided with a gap, and the gap is less than 3 times The thickness of the extension wall of the back shell is described.

Preferably, the area ratio of the orthographic projection of the sound-emitting monomer to the rear shell along the vibration direction of the diaphragm to the projection plane of the rear shell is at least 4/5.

Preferably, the front cover includes a first section fixed to the basin frame and a second section protruding away from the basin frame from the outer periphery of the first section in a direction perpendicular to the vibration direction, so The distance between the outer end surface of the second section and the basin frame is less than or equal to 0.20 mm.

Beneficial effect

Compared with the related art, in the sound generating device of the present invention, the rear shell, the front cover and the sounding unit are jointly enclosed by the rear sound cavity through the rear shell fixedly connected to the front cover and arranged around the basin frame. The leakage hole that the acoustic cavity communicates with the outside world. The above structure forms a closed back acoustic cavity structure, which is not only simple in structure, and the overall horizontal size perpendicular to the vibration direction is small, but also makes the acoustic effect of the sound device better, and the closed back acoustic cavity structure The front cover and the rear case can be used to absorb vibration, so that the sound emitting device is used in the mobile terminal to avoid the occurrence of case vibration, which makes the user experience better; in addition, the front cover and the diaphragm jointly form a sound cavity, The diaphragm is made to vibrate and produce sound inside the sound outlet cavity, that is, the diaphragm vibrates and produces sound inside an independent cavity, so as to avoid adverse effects of the external environment on the vibration of the diaphragm as much as possible, so as to ensure the reliability of vibration and sound.

Description of the drawings

In order to explain the technical solutions in the embodiments of the present utility model more clearly, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some implementations of the present utility model. For example, for those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings, among which:

Figure 1 is a schematic diagram of the three-dimensional structure of the sound generating device of the present invention;

Figure 2 is an exploded schematic diagram of a part of the three-dimensional structure of the sound generating device of the present invention;

Figure 3 is a sectional view taken along the line A-A in Figure 1;

Figure 4 is a partial enlarged view of the part shown in Figure 1 B;

Figure 5 is a sectional view taken along line B-B in Figure 1;

Fig. 6 is a schematic cross-sectional view of the diaphragm provided with a sealing boss in the first embodiment of the sound device of the present invention;

Figure 7 is a partial enlarged view of the part shown in Figure 6 B;

FIG. 8 is a schematic diagram of the three-dimensional structure of the diaphragm in FIG. 6;

9 is a schematic cross-sectional view of the second embodiment of the sound generating device of the present invention;

10 is a schematic cross-sectional view of the third embodiment of the sound generating device of the present invention;

11 is a schematic cross-sectional view of the fourth embodiment of the sound generating device of the present invention;

12 is a schematic diagram of the assembly of the sounding monomer and the conductive element of the fourth embodiment of the sounding device of the present invention;

13 is a schematic cross-sectional view of the fifth embodiment of the sound generating device of the present invention;

14 is a schematic cross-sectional view of the sixth embodiment of the sound generating device of the present invention;

15 is a schematic structural diagram of a derivative embodiment of the sixth embodiment shown in FIG. 14;

16 is a schematic diagram of the three-dimensional structure of the seventh embodiment of the sound generating device of the present invention;

FIG. 17 is a schematic diagram of a three-dimensional structure of a derivative embodiment of the seventh embodiment shown in FIG. 16.

Embodiments of the present invention

The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of them. Examples. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present utility model.

Implementation mode one

Please refer to FIGS. 1-5 at the same time. The present invention provides a sound emitting device 100, which includes a sound emitting unit 1 and a rear case 2.

The sound unit 1 includes a basin frame 11, a vibration system 12, a magnetic circuit system 13 and a front cover 14, and the sound unit 1 is provided with a leak 1310.

In this embodiment, the vibration system 12 and the magnetic circuit system 13 are respectively supported and fixed to the basin frame 11 and jointly enclose a sounding cavity 103, and the magnetic circuit system 13 drives the vibration system 12 to vibrate and produce sound.

The vibration system 12 includes a diaphragm 121 fixed to the frame 11 and used for vibrating and sounding, and a voice coil 122 connected to the diaphragm 121. The magnetic circuit system 13 includes a yoke 131 fixed on the side of the frame 11 away from the diaphragm 121, and The magnetic steel unit 132 that is fixedly supported on the yoke 131 and forms a magnetic gap 130, the leakage portion 1310 is provided through the yoke 131, and the voice coil 122 is inserted in the magnetic gap 130 to drive the diaphragm 121 to vibrate and produce sound.

More specifically, the diaphragm 121 includes a vibration portion 1211 connected to the voice coil 122, a folding ring portion 1212 extending from the outer periphery of the vibration portion 1211 in a direction away from the vibration portion 1211, and a folding ring portion 1212 away from the vibration portion 1211. The fixing portion 1213 extends by side bending, and the fixing portion 1213 is fixed to the basin frame 11.

The front cover 14 is fixed on the side of the basin frame 11 of the sound-producing unit 1 close to the diaphragm 121. The front cover 14 and the diaphragm 121 jointly enclose the sound cavity 101, and the rear shell 2 is fixedly connected to the front cover 14 and surrounds the basin frame. 11 settings.

The front cover 14 includes a front cover plate 143 partially attached and fixed to the sound emitting unit 1 and a sound outlet 140 penetrating through it. The sound outlet 140 communicates the sound outlet cavity 101 with the outside; more specifically, the front cover 14 includes a vibration The sounding plates 141 are arranged at relatively intervals from the diaphragm 121, the connecting wall 142 bent and extended from the sounding plate 141 to the diaphragm 121 along the vibration direction, and the front cover plate 143 bent and extended by the connecting wall 142 along the vertical vibration direction, the front cover The plate 143 is covered and fixed on the basin frame 11 and pressed on the side of the diaphragm 121 away from the basin frame 11, the sound outlet 140 is arranged along the vibration direction of the diaphragm 121 through the sound outlet plate 141, and the diaphragm 121 faces the sound outlet 140. The sound outlet 140 connects the sound outlet cavity 101 with the outside world. This structural arrangement improves the mid-frequency and high-frequency performance of the sound emitting device 100; on the other hand, the arrangement of the front cover 14 makes the diaphragm 121 vibrate inside the sound outlet cavity 101 Sounding, that is, the diaphragm 121 vibrates and emits sound inside an independent cavity, which avoids adverse effects of the external environment on the vibration of the diaphragm 121 as much as possible, so as to ensure the reliability of vibration and sound. More preferably, in order to improve the reliability of the fixing of the diaphragm 121, the front cover 143 is pressed on the fixing portion 1213 of the diaphragm 121.

It is worth mentioning that the number of sound holes 140 and the setting of their positions are not limited, they can be one or more, and the specific number and position of the setting can be determined according to the actual conditions of use, for example, in In this embodiment, the sound outlet 140 includes four, and the four sound outlets 140 are arranged in an array.

The rear shell 2 includes a rear shell plate 21 located on the side of the basin frame 11 away from the diaphragm 121 and spaced from the basin frame 11, and the outer periphery of the rear shell plate 21 is bent and extended in the direction of the front cover plate 143 on the peripheral side of the basin frame 11. The back shell extends the wall 22. The rear case extension wall 22 is fixedly connected to the bottom surface of the front cover plate 143 on the side close to the diaphragm 121 and forms a seal with the front cover plate 143. Specifically, the extension direction of the rear case extension wall 22 is parallel to the vibration direction of the diaphragm 121. The extension wall 22 of the rear case and the front cover 143 are arranged opposite to each other. More specifically, the manner of sealing between the front cover 143 and the extension wall 22 of the rear case is not limited, and it can be specifically selected according to actual needs. For example, in the first embodiment, the front cover 143 and the extension wall 22 The extension wall 22 of the rear shell can be fixed by welding or glue to form a seal.

Further, the front cover 143 includes a first section 1431 and a second section 1432 protruding from the outer periphery of the first section 1431 in the vertical vibration direction. The first section 1431 is fixed to the basin frame 11 and pressed on the diaphragm 121 The second section 1432 is the part of the front cover 143 that extends beyond the basin frame 11, and the second section 1432 is directly opposite to the rear shell extension wall 22 and is fixedly connected to the rear shell extension wall 22.

The rear housing 2, the front cover 14, the basin frame 11 and the magnetic circuit system 13 jointly enclose the rear acoustic cavity 102. The leaking part 1310 connects the sounding cavity 103 with the rear acoustic cavity 102 to improve the low-frequency acoustic performance. There is a leakage hole 23 penetrating the diaphragm 121 along the direction of vibration, and the leakage hole 23 connects the rear acoustic cavity 102 with the outside; more preferably, the sound-producing unit 1 also includes a ventilation hole that is fixed to the yoke 131 and completely covers the leakage portion 1310 The damping member 1311 and the leakage portion 1310 communicate with the rear acoustic cavity 102 through the breathable damping member 1311. The arrangement of the breathable damping member 1311 not only adjusts the leakage of the leakage portion 1310, further improves the low-frequency acoustic performance, but also effectively blocks the rear acoustic cavity 102 The foreign matter enters into the sound-producing monomer 1, ensuring the sound-producing reliability of the sound-producing monomer 1, and also provides conditions for the rear acoustic cavity 102 to be filled with sound-absorbing materials. Of course, the specific location of the leakage hole is not limited. In other embodiments, it is also feasible to arrange the leakage hole through the extension wall of the rear shell.

So far, the above-mentioned sound emitting device 100 of the present invention forms a closed rear acoustic cavity structure, which is simple in structure. On the one hand, it improves the acoustic performance of the sound emitting device 100, especially the low-frequency acoustic performance, and on the other hand, due to the existence of the rear acoustic cavity 102 structure , The front cover 14 and the rear case 2 form a vibration absorbing effect, so that the sound-generating device 100 will not cause case vibration in the electronic products such as mobile terminals after being used in electronic products such as mobile terminals, which effectively increases the user experience effect of customers. More preferably, in order to improve the reliability of the fixing of the diaphragm 121, the front cover 143 is pressed on the fixing portion 1213 of the diaphragm 121.

In the first embodiment, the front cover 14 and the rear case 2 are both made of one of metal, ceramic and glass materials. For example, the front cover 14 and the rear case 2 are made of metal materials, which include but not Limited to steel, iron, copper, etc., the front cover 14 and the rear case 2 together form a metal cover, and the front cover 14 or the rear case 2 is at least partially grounded, thereby forming a shielding effect to reduce the external electromagnetic field on the sound unit 1 The influence of vibration and sound can effectively improve the reliability of the vibration and sound of the sound-producing unit 1, and effectively improve the sound-producing performance.

In this embodiment, the thickness of the rear shell 2 is smaller than the thickness of the basin frame 11. Specifically, the thickness of the extension wall 22 of the rear shell is smaller than the thickness of the basin frame 11. The volume that is perpendicular to the vibration direction of the diaphragm 121 occupies a smaller volume, which is more conducive to use in a terminal with a small lateral installation space.

Furthermore, at least one side of the rear shell extension wall 22 and the basin frame 11 is provided with an interval 110, and the interval 110 is less than 3 times the thickness of the rear shell extension wall 22. The interval 110 reserves a certain assembly gap for the assembly of the sounding unit 1, so that the sounding unit 1 can be assembled into the housing 1 more quickly, and the assembly efficiency is improved. The horizontal space occupied by the vibration direction.

More preferably, the vibration system 12 and the magnetic circuit system 13 are located within the range of the basin frame 11, and the area ratio of the orthographic projection of the basin frame 11 to the rear shell 2 along the vibration direction of the diaphragm 121 to the projection plane of the rear shell 2 is at least 4/5. This structure can make the size of the sound generating device 100 perpendicular to the vibration direction as small as possible, which satisfies the requirements of forming the acoustic cavity 102 to achieve vibration absorption and improve low-frequency acoustic performance, and it is more convenient to install in products with small lateral dimensions in the assembly space.

It is worth mentioning that the front cover 14 and the rear case 2 have a uniform wall thickness structure, and the wall thickness of the front cover 14 and the wall thickness of the rear case 2 are both 0.15 mm. For example, in the first embodiment, the front cover 14 and The rear shell 2 is made of a 0.15mm thick steel sheet through a stretch forming process. Therefore, the thickness of the front cover 14 and the thickness d1 of the extension wall 22 of the rear shell are both 0.15mm.

Further, the extension wall 22 of the rear shell is spaced from the basin frame 11 to increase the volume of the rear acoustic cavity 102 and further improve the acoustic performance. It is used to increase the volume of the rear acoustic cavity 102 and further improve the acoustic performance. Specifically, the ratio of the distance d3 between the rear shell extension wall 22 and the basin frame 11 to the thickness d1 of the rear shell extension wall 22 is less than or equal to 1/3.

For example, the distance d2 between the outer end surface 1430 of the second section 1432 away from the basin frame 11 and the basin frame 11 is less than or equal to 0.20 mm, that is, the distance between the outer periphery of the front cover 143 and the basin frame 11 is less than or equal to 0.20 mm , The distance d3 between the extension wall 22 of the rear shell and the basin frame 11 is less than or equal to 0.05 mm.

In this embodiment, the distance between the outer periphery of the front cover 143 and the basin frame 11 is set to 0.20 mm, and the distance d3 between the rear shell extension wall 22 and the basin frame 11 is set to 0.05 mm. With this arrangement, under the condition that the structural strength stability of the rear case 2 is ensured, the increase in size of the sound emitting device 100 along one side perpendicular to the vibration direction is relatively minimal, and the increase in size on one side is only 0.20mm, which does not affect its use in portable devices. In mobile terminal electronic products.

Further, in order to electrically connect the sound emitting monomer 1 located in the rear acoustic cavity 102 to the outside, in the first embodiment, the sound emitting device 100 further includes a conductive member 3 and a soldering tab 4.

The welding piece 4 is fixed on the side of the basin frame 11 away from the diaphragm 121, and the voice coil 122 of the vibration system 12 is electrically connected to the welding piece 4, and one end of the conductive member 3 extends to the basin frame through the front cover 14 and the rear shell 2 11 and electrically connected to the solder tab 4, that is, this end is electrically connected to the vibration system 12 through the solder tab 4, and the other end of the conductive member 3 is also used to connect an external electrical signal, that is, to supply power to the voice coil 122 of the vibration system 12, that is, to conduct electricity. The member 3 transmits the external electrical signal to the voice coil 122 through the solder tab 4, and the voice coil 122 drives the diaphragm 121 to vibrate and produce sound under the control of the electrical signal; more specifically, in the first embodiment, the rear shell extension wall 22 There is an opening 220 penetrating therethrough along the vertical vibration direction, and the conductive member 3 extends through the opening 220 into the rear acoustic cavity 102 and is electrically connected with the soldering piece 4.

Further, the conductive member 3 includes a first arm 31 penetrating through the opening 220, a second arm 32 extending from opposite ends of the first arm 31 toward the sound emitting unit 1, and a second arm 32 extending away from the sound emitting unit 1 from the first arm 31 The third arm 33 extending in the direction 1; the second arm 32 is fixed to the basin frame 11 of the sound unit 1 and is electrically connected to the vibration system 12 through the solder plate 4, and the third arm 33 is located outside the rear acoustic cavity 102 for connecting external electrical signals .

In the above structure, through the opening 220, the conductive member 3 and the soldering lug 4 are electrically connected inside the rear acoustic cavity 102, effectively avoiding the influence of the external environment on the electrical connection between the two, and ensuring the reliability of the electrical connection.

It should be noted that, in the first embodiment above, because the area of the part (ie the glued surface) of the diaphragm 121 fixed to the frame 11 is small, the width is narrow, that is, the area of the fixing part 1213 is small, and the width is narrow, so that The reliability of the seal between the diaphragm 121 and the front cover 143 is poor. Therefore, please refer to FIGS. 6-8 at the same time. As a more optimal implementation of the first embodiment, a ring-shaped sealing boss 1214 is formed by protruding on the side of the diaphragm 121 close to the front cover 14. , The front cover 143 presses the sealing boss 1214 against the basin frame 11 and compresses the sealing boss 1214 to form a seal, which effectively improves the reliability of the sealing between the diaphragm 121 and the front cover 14.

Implementation mode two

Please refer to FIG. 9, which is a schematic cross-sectional view of the second embodiment of the sound generating device of the present invention. The sound emitting device 100a of the second embodiment is basically the same as the sound emitting device of the first embodiment, and the same parts will not be repeated one by one. The main difference between the two is the specific arrangement and function of the conductive member. The following is an expanded description of the second embodiment Specific settings of conductive parts:

In the second embodiment, both the front cover 14a and the rear shell 2a are made of metal materials, and the conductive member 3a is provided. For example, both the front cover 14a and the rear shell 2a are made of 0.15mm thick steel sheet stretched.

Specifically, the sounding device 100a further includes a conductive member 3a, one end of the conductive member 3a is connected to the front cover 14a and/or the rear case 2a, and the other end of the conductive member 3a is used for grounding, thereby forming a shielding effect, so that the sounding monomer 1a avoids Affected by external electromagnetic interference, the working reliability is better.

Implementation mode three

Please refer to FIG. 10, which is a schematic cross-sectional view of the third embodiment of the sound emitting device of the present invention. The sound emitting device 100b of the third embodiment is essentially another derivative embodiment of the sound emitting device of the second embodiment of FIG. 9. The same parts will not be repeated one by one, but the main difference of the sound emitting device 100b of the third embodiment is:

In the third embodiment, the conductive member 3b and the rear shell 2b are an integral structure, and the conductive member 3b is formed by extending the rear shell 2b in a direction away from the sound emitting unit 1b, and the conductive member 3b is located between the front cover 14b and the rear shell 2b. On the outside, it is used for grounding, thereby forming a shielding effect, so that the vocal unit 1b avoids external electromagnetic interference and has better working reliability.

Of course, the specific forming method of the conductive member is not limited. The conductive member and the front cover are integrated, and it is also feasible to form the conductive member from the front cover in a direction away from the sound emitting monomer.

Implementation mode four

Please refer to FIGS. 11-12, which are a schematic cross-sectional view of the fourth embodiment of the sound emitting device of the present invention. The sound emitting device 100c of the fourth embodiment is essentially another derivative embodiment of the sound emitting device of the first embodiment in FIG. The same parts of the two will not be repeated one by one, but the main difference between the two lies in the specific settings of the conductive elements. The specific settings of the conductive elements of the fourth embodiment will be explained below:

The sound emitting device 100c further includes a conductive member 3c, and the conductive member 3c includes two electrical paths, one of which is used to connect the sound emitting unit 1c with an external electrical signal, and is used to supply power to the sound emitting unit 1c, and the other is electrically connected. The road is used to ground the front cover 14c and/or the rear case 2c to form a shield for the sound-emitting unit 1c.

In the fourth embodiment, the conductive member 3c is used to form a shielding function together with the front cover 14c and the rear case 2c, and is also used to supply power to the sound generating unit 1c. The conductive member 3c with a simple structure simultaneously achieves dual functions.

For example, the conductive member 3c is an FPC structure. The conductive member 3c includes a first arm 31c, a second arm 32c extending from opposite ends of the first arm 31c toward the sounding unit 1c, and a first arm 31c away from the sounding unit. The third arm 33c extending in the direction of the body 1c and the fourth arm 34c extending from the first arm 31c in the direction away from the sound emitting unit 1c.

The first arm 31c is electrically connected to the front cover 143c and/or the rear shell extension wall 22c; the second arm 32c is fixed to the basin frame 11c of the sound unit 1c and is electrically connected to the vibration system 12c to supply power to the vibration system 12c; third The arm 33c is used for connecting external electrical signals; the fourth arm 34c is used for grounding. That is, the first arm 31c and the fourth arm 34c jointly realize the connection of the front cover 14c and/or the rear case 2c to the ground. In this embodiment, an electrical path for shielding the sound emitting unit 1c is formed; the first arm 31c , The second arm 32c and the third arm 33c jointly realize the electrical connection between the sound emitting unit 1c and the external electrical signal, and realize another electrical path through which the sound emitting unit 1c communicates with the external electrical signal.

Through the arrangement of the conductive member 3c, while realizing the provision of electrical signals to the sound emitting unit 1, it can also form a barrier function, which makes the design of the sound emitting device 100c simpler.

Implementation mode five

Please refer to FIG. 13, which is a schematic cross-sectional view of the fifth embodiment of the sound generating device of the present invention. The sound emitting device 100d of the fifth embodiment is based on the sound emitting device of the first embodiment, and a side sound emitting structure is added. The structure of the other parts is basically the same. The difference is:

The sound emitting device 100d generates sound from the front side to form a sound emitting structure on the side.

The sound-emitting device 100d further includes a sound-guiding shell 5d which is arranged on the side of the front cover 14d away from the rear shell 2d. The sound-guiding shell 5d has a sound-guiding cavity 50d forming a side sound-emitting structure; more specifically, the sound-guiding shell 5d and the front cover 14d are common Surrounding the sound guiding cavity 50d, the side of the sound guiding shell 5d opposite to the extension wall 22d of the rear shell is provided with a side sound hole 520d penetrating therethrough. The side sound hole 520d communicates the sound guiding cavity 50d with the outside to form a side sound structure.

Further, the sound conducting shell 5d includes a sound conducting shell plate 51d spaced and opposed to the front cover plate 143d, and a sound conducting shell that is bent and extended from the periphery of the sound conducting shell plate 51d to the front cover 14d and supported and fixed to the periphery of the front cover plate 143d The extension wall 52d and the side sound hole 520d are provided through the extension wall 52d of the sound guide shell, thereby forming a side sounding structure, which is convenient for flexible use of different installation positions.

It should be noted that, in other embodiments, the front cover further includes a sound guide cavity forming a side sound emission structure, and the sound guide cavity communicates with the sound outlet cavity through the sound hole of the front cover, that is, the side sound emission structure is directly formed on the front cover Yes, the structure arrangement effectively simplifies the assembly process, and there is no need to assemble the sound conducting shell separately, so that the formation of the side sound structure is more reliable.

Embodiment Six

Please refer to FIG. 14, which is a schematic cross-sectional view of the sixth embodiment of the sound generating device of the present invention. The sound emitting device 100e of the sixth embodiment is based on the sound emitting device of the first embodiment, and a breathable spacer is added. The structure of the other parts is basically the same. The difference is:

The sound emitting device 100e further includes a gas-permeable spacer 6e located in the rear acoustic cavity 102e. The gas-permeable spacer 6e includes a spacer body 61e arranged opposite to the rear shell 2e, and a spacer body 61e bent and extended in the direction of the rear shell 2e from the periphery of the spacer body 61e The spacer extension 62e and the spacer fixing part 63e bent and extended from the end of the spacer extension 62e away from the spacer body 61e; the spacer extension 62e is spaced apart from the rear case 2e, and the spacer fixing part 63e is fixed to the rear case 2e; the air-permeable spacer 6e and the rear shell 2e jointly enclose a powder filling space 60e.

The powder filling space 60e is used for filling sound-absorbing materials. When the rear acoustic cavity 102e is filled with sound-absorbing materials, such as sound-absorbing particles, the air-permeable spacer 6e effectively prevents the sound-absorbing particles from entering the space between the magnetic circuit system 13e and the vibration system 12e. The risk of sound failure is avoided, and reliability is improved.

In this sixth embodiment, more specifically, the spacer fixing portion 63e is fixed to the rear shell plate 21e, and the spacer extension 62e is spaced apart from the rear shell extension wall 22e of the rear shell 2e, which can effectively increase the smoothness of ventilation of the rear acoustic cavity 102e , Improve the stability of low-frequency sound performance.

It is worth mentioning that FIG. 15 is a schematic structural diagram of a derivative embodiment of the sixth embodiment shown in FIG. 14. Referring to the sound emitting device 100f shown in FIG. 15, the side of the isolator body 61f close to the sound emitting unit 1f is recessed in a direction away from the sounding unit 1f to form an avoiding step 610f, and the avoiding step 610f and the leakage portion 1310f are arranged directly opposite. This structural arrangement can make the leakage of the sounding cavity 103f of the sounding unit 1f smoother, thereby improving the sounding performance.

Implementation mode seven

Please refer to FIG. 16, which is a schematic diagram of the three-dimensional structure of the seventh embodiment of the sound generating device of the present invention. The sound emitting device 100g of the seventh embodiment is based on the sound emitting device of the first embodiment, and a positioning piece is added. The structure of the other parts is basically the same. The point is:

The sound emitting device 100g also includes at least two positioning pieces 7g which are respectively connected to the rear case 2g.

It should be noted that the specific number of the positioning pieces 7g can be set according to actual usage conditions. For example, in the seventh embodiment, the positioning pieces 7g include two.

Further, the end of each positioning piece 7g away from the rear case 2g is provided with a positioning hole 70g penetrating through it, which is used to fix and position the sound emitting device 100g with the application terminal. The 70g is fixed on the terminal machine, which is simple and convenient, and the two positioning pieces 7g can form a positioning and fixation more effectively. In order to further improve the fixing stability, the two positioning pieces 7g are connected to opposite sides or two diagonal corners of the rear shell 2g, and the symmetrical arrangement makes the sound generating device 100g and the whole terminal have a better positioning and fixing effect. In this embodiment, the positioning piece 7g is fixed to the rear housing 2g by welding, that is, the positioning piece 7g and the rear housing 2g are a separate structure of two devices.

Please refer to FIG. 17, which is a schematic structural diagram of a derivative embodiment of the seventh embodiment shown in FIG. 16. The difference between it and the seventh embodiment shown in FIG. 16 is that in the sound emitting device 100h of this embodiment, the positioning piece 8h is formed by extending outward from the rear shell 2h, that is, the positioning piece 8h and the rear shell 2h are integrally formed, and the forming is simple. , Reduce the number of components and improve assembly efficiency.

The above are only the embodiments of the present utility model. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present utility model, but these all belong to The scope of protection of the utility model.

Claims

A sound emitting device includes a sound emitting monomer, the sound emitting monomer includes a diaphragm for vibrating and sounding, and a front cover fixed on a side of the sound emitting monomer close to the diaphragm, the front cover and The diaphragms collectively enclose a sound-emitting cavity, wherein the sound-emitting device further includes a rear shell fixedly connected to the front cover and arranged around the sound-emitting monomer;

The front cover includes a front cover plate partially attached and fixed to the sound emitting monomer, and a sound hole penetrating through the front cover, and the sound hole connects the sound outlet cavity with the outside;

The rear shell includes a rear shell plate spaced apart from the sound emitting unit and a rear shell extension wall bent and extended from the rear shell plate to the front cover along the peripheral side of the sound emitting unit, and the rear shell extends The wall is fixedly connected to the bottom surface of the front cover near the side of the diaphragm and forms a seal with the front cover, the rear shell and the sounding monomer jointly enclose a rear sound cavity, and the sounding monomer A leakage part communicating with the rear acoustic cavity is provided, and the rear shell is provided with a leakage hole penetrating the rear acoustic cavity, and the leakage hole communicates the rear acoustic cavity with the outside.
The sounding device according to claim 1, wherein the front cover further comprises a sounding plate arranged opposite to the diaphragm and a connecting wall bent and extended from the sounding plate to the diaphragm The front cover is formed by bending and extending the connecting wall, and the sound outlet is provided through the sound outlet.
The sounding device according to claim 1, wherein the front cover plate is pressed on the diaphragm.
The sounding device according to claim 2, wherein the side of the diaphragm close to the front cover protrudes to form a ring-shaped sealing boss, and the front cover is pressed on the sealing boss And form a seal.
The sound emitting device according to claim 1, wherein the front cover and the rear shell are made of metal materials.
The sound emitting device according to claim 5, wherein the front cover or the rear case is at least partially used for grounding.
The sound emitting device according to claim 5, wherein the sound emitting device further comprises a conductive member, one end of the conductive member is connected to the front cover and/or the rear case, and the other end of the conductive member Used for grounding.
7. The sound emitting device according to claim 7, wherein the conductive member is formed by extending the front cover or the rear case.
The sound-emitting device according to claim 5, wherein the sound-emitting device further comprises a conductive member, the conductive member includes two electrical paths, and one of the electrical paths is used to connect the sound-emitting monomer and An external electrical signal, and the other electrical channel is used to ground the front cover and/or the rear case.
The sound emitting device according to claim 1, wherein the sound emitting device further comprises at least two positioning pieces, and the at least two positioning pieces are connected to opposite sides or two diagonal corners of the rear shell, so One end of the positioning piece away from the rear shell is provided with a positioning hole penetrating it.
The sound emitting device according to claim 10, wherein the positioning piece is formed by extending the rear shell outward.
The sound-emitting device according to claim 1, wherein the sound-emitting device further comprises a sound-conducting shell covering a side of the front cover away from the rear shell, and the sound-conducting shell has a side sound-emitting structure A sound guide cavity, the sound guide cavity communicates with the sound outlet cavity through the sound outlet hole.
The sounding device according to claim 1, wherein the front cover further comprises a sound guide cavity forming a side sounding structure, and the sound guide cavity is in communication with the sound outlet cavity through the sound outlet hole.
The sounding device according to claim 1, wherein the sounding device further comprises a gas-permeable spacer located in the rear acoustic cavity, and the gas-permeable spacer comprises a spacer body arranged opposite to the rear shell plate. , A spacer extension part bent and extended from the periphery of the spacer body in the direction of the rear shell plate, and a spacer fixing part bent and extended from one end of the spacer extension part away from the spacer body; The spacer extension part is spaced apart from the rear shell extension wall, and the spacer fixing part is fixed to the rear shell plate; the air-permeable spacer and the rear shell jointly enclose a powder filling space.
The sounding device according to claim 14, wherein the side of the isolator body close to the sounding unit is recessed in a direction away from the sounding unit to form an avoiding step, and the avoiding step and the leaking portion Set it right.
The sound emitting device according to claim 1, wherein the front cover and the rear shell are both made of 0.15mm thick steel sheet.
The sounding device according to claim 1, wherein the sounding unit further comprises a basin frame, the diaphragm is attached and fixed to the basin frame, and the front cover is fixed to the basin frame close to the On the side of the diaphragm, the extension wall of the rear shell surrounds the peripheral side of the basin frame; the thickness of the extension wall of the rear shell is smaller than the thickness of the basin frame; at least one side of the extension wall of the rear shell and the basin frame A gap is provided, and the gap is less than 3 times the thickness of the extension wall of the rear shell.
The sounding device according to claim 17, wherein the area ratio of the orthographic projection of the sounding monomer to the rear case along the vibration direction of the diaphragm to the projection plane of the rear case is at least 4/ 5.
The sounding device according to claim 17, wherein the front cover includes a first section fixed to the basin frame, and a peripheral edge of the first section away from the vibration direction along the direction perpendicular to the vibration direction. The second section of the basin frame protruding from, the distance between the outer end surface of the second section and the basin frame is less than or equal to 0.20 mm.