WO2021237795A1

WO2021237795A1 - Sound production device

Info

Publication number: WO2021237795A1
Application number: PCT/CN2020/094725
Authority: WO
Inventors: 吴树文; 曹成铭
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: 2020-06-05
Publication date: 2021-12-02
Also published as: CN212588498U

Abstract

Disclosed is a sound production device (100), comprising a housing (1) and a sound production unit (2), which is fixedly accommodated in the housing (1). The sound production unit (2) and the housing (1) jointly enclose a closed rear sound cavity (10), the sound production unit (2) comprises a frame (21), a vibration system (22) respectively supported and fixed on the frame (21), and a magnetic circuit system (23) driving the vibration system (22) to vibrate and produce sound, and the vibration system (22) comprises a vibrating diaphragm (221) fixed on the frame (21); the housing (1) comprises a rear housing (11) which is positioned on a side of the frame (21) far away from the vibrating diaphragm (221) and is spaced apart from the sound production unit (2), and a side wall (12) extending from the periphery of the rear housing (11) in the direction of the vibrating diaphragm (221), the side wall (12) surrounding a peripheral side of the frame (21); the thickness of the housing (1) is less than that of the frame (21); the side wall (12) is attached to the frame (21), or an interval (102) is provided between the side wall (12) and at least one side of the frame (21), and the interval (102) is three times smaller than the thickness of the housing (1); and the rear sound cavity (10) is jointly enclosed by the rear housing (11), the side wall (12) and the sound production unit (2), a leakage hole (103) penetrating the housing (1) is provided in the housing, and the rear sound cavity (10) is in communication with the outside by means of the leakage hole (103).

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 casing and a sound emitting unit fixedly housed in the casing, and the sound emitting unit and the casing jointly enclose a sealed rear acoustic cavity, The sound-producing unit includes a basin frame, a vibration system that is respectively supported and fixed to the basin frame, and a magnetic circuit system that drives the vibration system to vibrate and emit sound, and the vibration system includes a diaphragm fixed to the basin frame; The housing includes a rear shell located on the side of the basin frame away from the diaphragm and spaced from the sound emitting unit, and a side wall extending from the periphery of the rear shell in the direction of the diaphragm, and the side wall surrounds The peripheral side of the basin frame; the thickness of the shell is smaller than the thickness of the basin frame;

The side wall is attached to the basin frame, or the side wall is spaced from at least one side of the basin frame, and the space is less than 3 times the thickness of the housing;

The rear housing, the side walls, and the sounding monomer jointly enclose the rear sound cavity, the sounding monomer is provided with a leaking portion communicating with the rear sound cavity, and the housing is provided with a through hole A leak hole, which communicates the rear acoustic cavity with the outside world.

Preferably, the housing further includes a base attached and fixed to a side of the basin frame close to the diaphragm, the base is provided with a sound hole penetrating through the base, and the sound hole is in communication with the diaphragm, The end of the side wall away from the rear shell is connected to and sealed with the base.

Preferably, the side wall extends toward the inner side thereof to form a boss, and the side of the sound-producing monomer abuts against the boss and forms a seal toward the rear shell.

Preferably, the housing includes a first part and a second part that are separately arranged on opposite sides of the sound-producing monomer along a vibration direction perpendicular to the diaphragm, and the housing is composed of the first part and the second part. The second part is formed by splicing.

Preferably, the ratio of the thickness of the shell to the thickness of the basin frame is less than 0.4.

Preferably, the housing is made of metal material.

Preferably, the housing is at least partially grounded.

Preferably, the sound generating device further includes a conductive member, one end of the conductive member is electrically connected to the housing, and the other end of the conductive member is used for grounding.

Preferably, the conductive member is formed by extending the housing.

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 connect the shell and the ground.

Preferably, the sound generating 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 casing, and the positioning piece is provided at one end away from the casing. There are positioning holes running through it.

Preferably, the positioning piece is formed by extending outward from the casing.

Preferably, the sound-generating device further includes a conductive terminal, the rear shell is also provided with an electrical connection hole penetrating therethrough, and the conductive terminal is at least partially located in the electrical connection hole and exposed to the rear housing for communication with The external circuit is electrically connected.

Preferably, the shell is made of a 0.15mm thick steel sheet.

Preferably, the sound-producing unit further includes a front cover arranged on the side of the basin frame close to the diaphragm and enclosing a front acoustic cavity with the diaphragm, and the front cover is provided with a front sound cavity along the diaphragm. The vibration direction penetrates through the through hole thereon, and the through hole connects the front acoustic cavity with the outside.

Preferably, the sound generating device further includes a front cover arranged on a side of the basin frame close to the diaphragm and enclosing a front sound cavity with the diaphragm, and the front cover is provided with vibrations along the diaphragm. The direction penetrates through the through hole, the through hole connects the front acoustic cavity with the outside; the base is pressed and fixed on the side of the front cover away from the diaphragm, and the front cover passes through the The sound hole is exposed on the base.

Preferably, the sound generating device further includes a breathable damping member attached to the front cover, and the breathable damping member completely covers the through hole.

Preferably, the part of the diaphragm fixed to the basin frame is provided with a ring-shaped sealing boss protruding toward the front cover, and the front cover is pressed on the sealing boss to form a seal.

Preferably, the part of the diaphragm fixed to the basin frame is provided with a ring-shaped sealing boss protruding toward the base, and the base is pressed against the sealing boss to form a seal.

Preferably, the sound-emitting device includes a sound-guiding shell covering a side of the sound-emitting monomer 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 and the vibration The membrane is connected.

Preferably, the housing and the sound-emitting monomer also enclose a sound-guiding cavity forming a side sound-emitting structure, and the sound-guiding cavity is in communication with the diaphragm.

Preferably, the sound emitting device further includes a gas permeable isolator located in the rear acoustic cavity, and the gas permeable isolator is attached to the sound emitting monomer and separates the sound emitting unit from the rear acoustic cavity.

Preferably, the sound generating device further includes a gas-permeable spacer located in the rear acoustic cavity, and the gas-permeable spacer includes a spacer body arranged opposite to the rear shell at intervals, and is directed from the periphery of the spacer body to the A spacer extension part bent and extended in the direction of the back shell and a spacer fixing part bent and extended from an end of the spacer extension part away from the spacer body; the spacer extension part is arranged at a distance from the side wall, The spacer fixing part is fixed to the rear shell; 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, the ratio of the orthographic projection of the sound-emitting monomer to the rear shell along the vibration direction of the diaphragm to the projected plane area of the rear shell is at least 4/5.

Preferably, the interval is less than or equal to 1/3 of the width of the fixed surface of the diaphragm fixed to the basin frame.

Beneficial effect

Compared with the related art, the sound emitting device of the present invention includes a casing and a sound emitting unit fixedly housed in the casing. The sound emitting unit and the casing are designed to form a closed rear. Sound cavity, and the side wall is attached to the basin frame, or the side wall is spaced from at least one side of the basin frame, and the space is less than 3 times the thickness of the housing, the rear The housing, the side walls, and the sound emitting monomer jointly enclose the rear acoustic cavity, and the housing is provided with a leakage hole penetrating therethrough, and the leakage hole communicates the rear acoustic cavity with the outside world. The above structure forms The sealed rear acoustic cavity structure is not only simple in structure, and the overall horizontal dimension along the direction of vibration is small, but also makes the acoustic effect of the sound generating device better. Moreover, the sealed rear acoustic cavity structure enables the shell to absorb vibration, thereby making the sound generating device After being applied to a mobile terminal, the occurrence of shell vibration is avoided, and the user experience effect is better.

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;

Fig. 4 is an enlarged view of part B shown in Fig. 3;

Fig. 5 is a schematic structural diagram of another embodiment of fixing a sounding monomer through a boss derived from Fig. 3;

Fig. 6 is a three-dimensional schematic diagram of an embodiment of adding conductive elements of the sound generating device of the present invention;

FIG. 7 is a schematic diagram of a three-dimensional structure of another derivative embodiment of FIG. 6;

8 is a schematic diagram of a three-dimensional structure of another embodiment of adding conductive elements of the sound device of the present invention;

Figure 9 is an exploded view of a part of the three-dimensional structure of Figure 8;

FIG. 10 is a schematic structural diagram of an embodiment in which a side sound emission structure is derived from FIG. 3; FIG.

11 is a schematic structural view of another embodiment in which the housing in FIG. 1 is covered with a sounding monomer;

Figure 12 is a cross-sectional view taken along line C-C in Figure 11;

13 is an exploded schematic view of the three-dimensional structure of another embodiment of adding conductive elements to the sound device of the present invention;

Fig. 14 is a schematic structural view of the sound generating device shown in Fig. 3 with a breathable spacer added;

15 is a schematic diagram of another embodiment structure of the breathable spacer in the embodiment shown in FIG. 14;

FIG. 16 is a schematic structural diagram of a derivative embodiment of the embodiment shown in FIG. 15;

FIG. 17 is a schematic structural view of the diaphragm of the sound emitting device shown in FIG. 1 provided with a sealing boss;

18 is a schematic structural diagram of an embodiment in which a positioning piece is added to the sound generating device shown in FIG. 1;

FIG. 19 is a schematic structural diagram of a derivative embodiment of the embodiment shown in FIG. 18.

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.

Please refer to FIGS. 1-4 at the same time. The present invention provides a sounding device 100, which includes a housing 1 and a sounding monomer 2 fixedly housed in the housing 1. The sounding monomer 2 and the housing The body 1 collectively encloses a sealed rear acoustic cavity 10.

The sound unit 2 includes a basin frame 21, a vibration system 22, a magnetic circuit system 23 and a leakage part 24.

The vibration system 22 and the magnetic circuit system 23 are respectively supported and fixed to the basin frame 21 and jointly enclose a sounding cavity 104. The magnetic circuit system 23 drives the vibration system 22 to vibrate and produce sound.

The vibration system 22 includes a diaphragm 221 fixed to the basin frame 21, and the diaphragm 221 is used for vibrating and sounding.

The housing 1 includes a rear housing 11 located on the side of the basin frame 21 away from the diaphragm 221 and spaced from the sound emitting unit 2 and extending from the periphery of the rear housing 11 in the direction of the diaphragm 221 The side wall 12 is arranged around the circumference of the basin frame 21, so that the rear shell 11, the side wall 12, and the sound-producing monomer 2 jointly enclose the airtight rear sound cavity 10. The leaking portion 24 communicates with the rear acoustic cavity 10, so that the sounding cavity 104 is communicated with the rear acoustic cavity 10 through the leaking portion 24, so as to improve low-frequency acoustic performance. The side of the sounding monomer 2 close to the diaphragm 221 is the sounding side, which is directly connected to the outside to form a front sounding structure.

The housing 1 is provided with a leakage hole 103 penetrating therethrough, and the leakage hole 103 connects the rear acoustic cavity 10 with the outside, and is used to balance the sound pressure.

It should be noted that the flat structure also belongs to the rear shell 11 described in the present utility model, and the common combination of the flat structure and its peripheral edge bending and extending extended structure also belongs to the rear shell 11 described in the present utility model.

In this embodiment, the thickness of the shell 1 is smaller than the thickness of the basin frame 21. This structural design enables the shell 1 to meet the structural strength while occupying a large area along the vibration direction perpendicular to the diaphragm 221. Smaller size, more conducive to use in terminals with small horizontal installation space.

Specifically, the side wall 12 is attached to the basin frame 21, so that the rear acoustic cavity 10 is sealed.

Alternatively, at least one side of the side wall 12 and the basin frame 21 is provided with a gap 102, and the gap 102 is less than 3 times the thickness of the housing 1. The interval 102 can enable the sound emitting unit 2 to be assembled into the housing 1 more quickly and improve the assembly efficiency, and at the same time, it will not occupy more lateral space occupied by the sound emitting device 100 perpendicular to the vibration direction.

In addition, the aforementioned interval 102 can also be used to increase the volume of the rear acoustic cavity 10 and further improve the acoustic performance. ) 1/3 of the width.

At this time, the side wall 12 and the basin frame 21 can be formed to seal the rear acoustic cavity 10 by glueing, or the rear acoustic cavity 10 can be sealed by other structures.

For example, in this embodiment, the housing 1 further includes a base 13 attached and fixed to the side of the basin frame 21 close to the diaphragm 221, and the base 13 is provided with a sound hole 131 passing through it, so The sound hole 131 communicates with the diaphragm 221 for sound. At this time, the end of the side wall 12 away from the rear shell 11 is connected to and sealed with the base 13, so as to realize the sealing of the rear sound cavity 10.

For another example, in conjunction with FIG. 5, it is a schematic structural diagram of another embodiment derived from FIG. 3 in which a sounding monomer is fixed by a boss. The difference between this embodiment and the embodiment shown in FIG. 3 is that in the sound emitting device 200 in this embodiment, the housing 201 does not need to be provided with a base structure, but the side wall 2012 extends to the inside to form a boss 20121 , The side of the sound emitting monomer 202 facing the rear shell 2011 abuts against the boss 20121 and forms a seal, so as to achieve the sealing of the rear sound cavity 2010.

Please continue to refer to FIGS. 1-4. In this embodiment, specifically, the base 13 and the rear shell 11 are respectively covered on opposite sides of the basin frame 21 along the vibration direction of the diaphragm 221. . The ratio of the thickness of the shell 1 to the thickness of the basin frame 21 is less than 0.4, so that while the structural strength of the shell 1 is satisfied, the size of the sound emitting device 100 along the direction perpendicular to the vibration is increased as little as possible; The structural strength of the frame 21 is guaranteed while occupying as little space as possible.

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 10 structure The housing 1 forms a vibration absorbing effect, so that the sound-generating device 100 will not cause a shell vibration phenomenon 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.

It should be noted that in the sound emitting device 100 of the present invention, the basin frame 21 is a component used to support the vibration system 22 and the magnetic circuit system 23 to form a single sound emitting structure. The housing 1 is a component that wraps the sound emitting monomer 2 to form a sealed cavity on the periphery of the sound emitting monomer 2, that is, the sound emitting monomer 2 forms the rear acoustic cavity 10 as described above, thereby using To absorb vibration. Therefore, the rear shell 11, the side wall 12, and the base 13 of the housing 1 are not part of the basin 21 in this embodiment.

More preferably, the sound-producing unit 2 further includes a front cover 3 covering a side of the basin frame 21 close to the diaphragm 221 and enclosing a front acoustic cavity 20 with the diaphragm 221, the front cover 3 A through hole 31 penetrating the diaphragm 221 along the vibration direction is provided, and the through hole 31 connects the front acoustic cavity 20 with the outside. In this embodiment, the front cover 3 is a part of the structure of the sound emitting monomer 2, that is, the sound emitting monomer 2 has its own front cover 3.

Alternatively, the front cover 3 may not be a part of the sound emitting unit 2, but a part of the sound emitting device 100. For example, the sound emitting device 100 may further include a cover provided on the side of the basin frame 21 close to the diaphragm 221. The front cover 3 of the front acoustic cavity 20 is enclosed with the diaphragm 221. The front cover 3 is provided with a through hole 31 passing through it along the vibration direction of the diaphragm 221, and the through hole 31 connects the front acoustic cavity 20 with the outside. This structural arrangement improves the intermediate frequency of the sound generating device 100 High frequency performance. At this time, the base 13 is pressed and fixed to the side of the front cover 3 away from the diaphragm 221, and the front cover 3 passes through the sound hole 131 and is exposed to the base 13.

In order to further improve the mid-frequency and high-frequency performance of the sound generating device 100, the sound generating device 100 further includes a breathable damping member 4 attached to the front cover 3, and the breathable damping member 4 completely covers the through hole 31. To prevent foreign matter from entering the front acoustic cavity 20, the damping of the air-permeable damping member 4 can be adjusted in the other direction to adjust the mid-frequency and high-frequency performance of the sound device.

In this embodiment, the through holes 31 include a plurality of and are arranged in an array to improve sound stability and balance.

Because the part (ie, the glued surface) of the diaphragm 221 fixed to the basin frame 21 has a small area and a narrow width, the reliability of sealing is poor. Therefore, in this embodiment, please refer to FIG. 17 as shown in FIG. 17a. In the sound generating device 100, the part of the diaphragm 221 fixed to the basin frame 21 is arranged in a direction close to the front cover 3. The protruding ring-shaped sealing boss 2211. When assembling, the front cover 3 is pressed on the sealing boss 2211 and the sealing boss 2211 is compressed to form a seal, which has better sealing reliability. Or, as shown in FIG. 17b, in the sound generating device 100', the portion of the diaphragm 221' fixed to the basin frame 21' is provided with a ring-shaped sealing boss protruding toward the base 13 2211'. When assembling, the base 13' is pressed on the sealing boss 2211' and the sealing boss 2211' is compressed to form a seal, which has better sealing reliability.

Please continue to refer to FIGS. 1-4. In this embodiment, the housing 1 can be made of metal, glass, ceramics and other materials. Preferably, the housing 1 is made of metal materials, such as steel, iron, copper and the like. It can be designed to be thinner while satisfying the structural strength, thereby further reducing the lateral size of the sound emitting device 100 in the direction perpendicular to the vibration direction.

More preferably, the housing 1 is at least partially grounded, so as to form a shielding effect on the sounding monomer 2, reduce the interference effect of external signals on the sounding monomer 2, and improve reliability.

The rear shell 11 and the side wall 12, and the side wall 12 and the base 13 are fixed by welding or glue to form a seal.

In this embodiment, the housing 1 is made of steel sheet with a thickness of 0.15 mm. The interval 102 is less than or equal to 1/3 of the width of the fixing surface (gluing surface) of the diaphragm 221 fixed to the basin frame 21.

For example, the distance between the side wall 13 and the basin frame 21 is less than or equal to 0.05 mm. The thickness of the casing 1 is 0.15 mm.

After the structure is installed, under the condition of ensuring the structural strength stability of the housing 1, 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 0.2mm, which does not affect the expected use. In portable mobile terminal electronic products.

In this embodiment, the ratio of the orthographic projection of the sound emitting unit 2 to the rear shell 11 along the vibration direction of the diaphragm 22 to the projected plane area of the rear shell 11 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 the acoustic cavity 10 to achieve vibration absorption and improve low-frequency acoustic performance after being formed, and it is more convenient to install in products with small lateral dimensions in the assembly space. More preferably, the sound generating device 100 further includes a gas permeable spacer 5 located in the rear acoustic cavity 10, and when the rear acoustic cavity 10 is filled with sound-absorbing materials, such as sound-absorbing particles, the gas permeable spacer 5 is effective This prevents sound-absorbing particles from entering the space between the magnetic circuit system 23 and the vibration system 22, avoids the risk of sound failure, and improves reliability.

Please refer to the figure shown in FIG. 6, which is a three-dimensional structure diagram of the embodiment of adding conductive elements of the sound device of the present invention. In the sound generating device 300, the housing 301 is made of a metal material, such as steel, iron, copper, etc., for example, the housing 301 is made of a steel sheet with a thickness of 0.15 mm.

The housing 301 is made of a metal material and can be made thinner with the same structural strength, thereby further reducing the horizontal size of the sound emitting device 300 along the direction of vibration. The main difference from the embodiment shown in FIG. 1 is that: the embodiment also includes a conductive member 6.

Specifically, the sound emitting device 300 further includes a conductive member 6, one end of the conductive member 6 is connected to the housing 301, and the other end of the conductive member 6 is used for grounding, thereby forming a screen function, so that the sound emitting unit 300 avoids external electromagnetic interference and has better working reliability.

Please refer to FIG. 7, which is a schematic diagram of a three-dimensional structure of another derivative embodiment of FIG. The rear shell 4011 is formed to extend in a direction away from the basin frame, and is located on the outside of the housing 401.

Please refer to FIG. 8, which is a three-dimensional structure diagram of another embodiment of adding conductive elements of the sound device of the present invention. This embodiment is different from the embodiment shown in FIG. 6 in that the structure and function of the conductive member are different.

Specifically, the sound emitting device 500 further includes a conductive member 506, and the conductive member 506 includes two mutually insulated electrical paths, one of the electrical paths is used to connect the sound emitting monomer 502 with an external electrical signal, It is used to supply power to the sound unit 502, and the other electrical channel is used to connect the housing 501 and the ground to form a shield for the sound unit 502. In this embodiment, the conductive member 506 is used to form a shielding effect together with the housing 501, and is also used to supply power to the sound generating unit 502, which has a simpler structure and can achieve dual functions.

For example, the conductive member 506 has an FPC structure. Specifically, as shown in FIGS. 8-9, the conductive member 506 includes a first arm 5061 penetrating through the side wall 5012, a second arm extending from opposite ends of the first arm 5061 in the direction of the basin frame 5021 5062. A third arm 5064 extending from the first wall 5061 in a direction away from the basin frame 5021, and a fourth arm 5064 extending from the first wall 5061 in a direction away from the basin frame 5021.

The first arm 5061 is electrically connected to the housing 501; the second arm 5062 is fixed to the basin frame 5021 and is electrically connected to the sound emitting unit 502 to supply power to the sound emitting unit 502; the third arm 5063 Used to connect external electrical signals; the fourth arm 5064 is used to ground. That is, the first arm 5061 and the fourth arm 5064 jointly connect the housing 501 to the ground to form an electrical path for shielding the sound emitting unit 502; the first arm 5061, the second arm 5062, and The third arm 5063 jointly realizes the electrical connection between the sound emitting unit 502 and the external electrical signal, and is realized as another electrical path through which the sound emitting unit 502 communicates with the external electrical signal.

Please refer to FIG. 13, which is an exploded schematic view of the three-dimensional structure of another embodiment of adding conductive elements to the sound device of the present invention. The difference from the embodiment shown in FIG. 1 is that the sound emitting device 600 further includes a conductive terminal 607, the conductive terminal is fixed to the basin frame 6021 and is connected to the sounding monomer 602, and the rear shell 6011 is also provided with a through On the electrical connection hole 608, the conductive terminal 607 is at least partially located in the electrical connection hole 608 and exposed to the rear shell 6011 for electrical connection with an external circuit. As a result, the sound generating device 600 is formed to realize power connection along the vibration direction, which avoids occupying the lateral space of the sound generating device 600 perpendicular to the vibration direction, and is more conducive to being applied to terminals with a small assembly space.

As shown in FIG. 10, it is a schematic structural diagram of an embodiment that is derived from the embodiment shown in FIG. 3 to form a side sound. That is to say, the sound-producing device forms a sound-producing structure from the front side.

Specifically, the sound-emitting device 100 includes a sound-conducting shell 14 covering a side of the sound-emitting monomer 2 away from the rear shell 11, and the sound-conducting shell 14 has a sound-guiding cavity 101 forming a side sound-emitting structure 140, so The sound guide cavity 101 is in communication with the diaphragm 22. The side sound structure 140 can better guide sound, which is convenient for use when the front sound is blocked, and has higher flexibility in use.

For example, the sound guide shell 14 and the diaphragm 22 jointly enclose a sound guide cavity 101. Specifically, the sound guide shell 14 includes a sound guide shell plate 141 spaced and opposed to the diaphragm 22, and a sound guide shell plate 141 extends from the periphery of the sound guide shell plate 141 toward the sound emitting unit 2 and is supported and fixed to the sound emitting unit 2 The sound-conducting shell extension wall 142 at the periphery of the single body 2 is provided through the sound-conducting shell extension wall 142 to form a side sounding structure, which is convenient for flexible use of different installation positions.

It should be noted that the communication between the sound guiding cavity 101 and the diaphragm 22 may be direct communication, or the diaphragm 22 may communicate through the front acoustic cavity 20 and then the sound guiding cavity 101, which is easily understood by those skilled in the art. At this time, it is understood that the sound conducting shell 14 is a component of the sound emitting device 100 and does not belong to the housing 1.

When the sound conducting shell 14 is understood as a part of the shell 1, it is also feasible, that is, the sound conducting shell 14 may be a part of the shell 1. In this case, it is the shell 1 and the sound emitting monomer. 2 is also enclosed to form a sound guide cavity 101 forming a side sounding structure, and the sound guide cavity 101 is in communication with the diaphragm 22.

Please refer to FIGS. 11-12, where FIG. 11 is a schematic structural diagram of another embodiment in which the housing in FIG. 1 is covered with a sounding monomer; FIG. 12 is a cross-sectional view of FIG. 11 along the line C-C. In the sound generating device 700 of the present invention, the combination of the rear shell 7011, the side wall 7012, and the base 7013 is not limited to the way of covering the sound emitting unit 702 along the vibration direction in the embodiment shown in FIG. Opposite sides of the It can also be covered by the peripheral side of the sounding monomer 702, that is, it is covered perpendicular to the vibration direction. The structure is the same, and the only difference lies in the covering direction of the housing 701.

That is, the housing 701 includes a first part 7001 and a second part 7002 that are separately provided on opposite sides of the sound emitting unit 702 along a vibration direction perpendicular to the diaphragm 7022, and the housing is formed by the first part 7002. The part 7001 and the second part 7002 are spliced together.

In the cover arrangement of the housing 701 of this embodiment, the first part 7001 is first covered on one of the peripheral sides of the sounding unit 702 along the direction of vibration, and the side of the sounding unit 702 with the diaphragm 7022 is fixed. In the first part 7001, at this time, the side of the sound-producing monomer 702 close to the diaphragm 7022 is inserted against the base 7013 to form a guiding effect and improve the assembly efficiency. In the same way, when the second part 7002 is covered with the sounding monomer 702 from the opposite side, the side of the sounding monomer 702 with the diaphragm 7022 is attached to the base 7013 to form a guiding function. After abutting on the first part 7001, the two are fixedly connected, such as gluing or welding, so as to form a horizontal splicing of the two.

Please refer to FIG. 14, which is a schematic diagram of the structure of adding a gas-permeable spacer to the sound emitting device shown in FIG. 3. Specifically, the sound emitting device 100 further includes a gas-permeable isolator 7 located in the rear acoustic cavity 10, and the gas-permeable isolator 7 is attached to the sound monomer 2 and the sound monomer 2 is removed from the rear sound cavity. The acoustic cavity 10 is divided. When the sound-absorbing particles are filled in the rear acoustic cavity 10, the air-permeable spacer prevents the sound-absorbing particles from entering the sound-producing monomer 2 and affecting its acoustic performance, thereby improving the reliability of sound production.

Please refer to FIG. 15, which is a schematic diagram of the specific structure of the air-permeable spacer in the embodiment shown in FIG. 14. The sound generating device 800 further includes a gas-permeable spacer 807 located in the rear acoustic cavity 8010, and the gas-permeable spacer 807 includes a spacer body 8071 arranged opposite to the rear shell 8011 at intervals. The spacer extension part 8072 whose periphery is bent and extended in the direction of the rear shell 8011 and the spacer fixing part 8073 which is bent and extended from one end of the spacer extension part 8072 away from the spacer body 8071.

The spacer extension 8072 is spaced apart from the side wall 8012, and the spacer fixing part 8073 is fixed to the rear shell 8011; the air-permeable spacer 807 and the rear shell 8011 jointly enclose a powder filling space 801 . Wherein, the structure in which the spacer extension 8072 and the side wall 8012 are spaced apart can effectively increase the smoothness of ventilation of the rear acoustic cavity 8010 and improve the stability of the low-frequency sound performance.

Please refer to FIG. 16, which is a schematic structural diagram of a derivative embodiment of the embodiment shown in FIG. 15. In the sounding device 900, the side of the isolator body 9071 close to the sounding unit 902 is recessed in a direction away from the sounding unit 902 to form an avoiding step 9074, and the avoiding step 9074 is in line with the leakage portion 9024. Pair set. This structural arrangement can make the leakage of the sounding cavity 9104 of the sounding monomer 902 smoother, thereby improving the sounding performance.

Please refer to FIG. 18 for a structural schematic diagram of an embodiment in which a positioning sheet is added to the sound generating device shown in FIG. 1. The sound emitting device 1000 further includes at least two positioning pieces 8, and the at least two positioning pieces 8 are respectively connected to the housing 1001. One end of the positioning piece 8 away from the housing 1001 is provided with a positioning hole 81 penetrating through it, which is used to fix and position the sound emitting device 1000 with the application terminal. For example, it is a threaded hole. The hole 81 is fixed on the terminal device, which is simple and convenient, and the positioning sheet 8 is provided with at least two positioning sheets 8 to form a positioning fixation more effectively. In order to further improve the fixing stability, the at least two positioning pieces 8 are connected to opposite sides or two diagonal corners of the housing 1001, and the symmetrical arrangement makes the sound generating device 1000 and the terminal device have a better positioning and fixing effect. In this embodiment, the positioning piece 8 is fixed to the housing 1001 by welding, that is, the positioning piece 8 and the housing 1001 are a separate structure of two devices. Of course, when the housing 1001 is made of a metal material, the positioning piece 8 can also be used for grounding at the same time to form a shield for the housing 1001.

Please refer to FIG. 19, which is a schematic structural diagram of a derivative embodiment of the embodiment shown in FIG. 18. The difference from the embodiment shown in FIG. 18 is that in the sound generating device 1100 in this embodiment, the positioning piece 1118 is formed by extending outward from the housing 1111, that is, the positioning piece 1118 and the housing 1111 are integrally formed The structure is simple to form, the number of components is reduced, and the assembly efficiency is improved.

Compared with the related art, the sound emitting device of the present invention includes a casing and a sound emitting unit fixedly housed in the casing. The sound emitting unit and the casing are designed to form a closed rear. Sound cavity, and the side wall is attached to the basin frame, or the side wall is spaced from at least one side of the basin frame, and the space is less than 3 times the thickness of the housing, the rear The housing, the side walls, and the sound emitting monomer jointly enclose the rear acoustic cavity, and the housing is provided with a leakage hole penetrating therethrough, and the leakage hole communicates the rear acoustic cavity with the outside world. The above structure forms The sealed rear acoustic cavity structure is not only simple in structure, the overall horizontal dimension along the direction of vibration is small, and the acoustic effect of the sound generating device is better, and the sealed rear acoustic cavity structure enables the shell to be used for vibration absorption, thereby making the sound generating device After being applied to a mobile terminal, the occurrence of shell vibration is avoided, and the user experience effect is better.

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 sounding device, which comprises a housing and a sounding monomer fixedly housed in the housing, the sounding monomer and the housing jointly enclose a sealed rear acoustic cavity, and the sounding monomer includes a basin frame and a respective Support a vibration system fixed to the basin frame and a magnetic circuit system that drives the vibration system to vibrate and produce sound. The vibration system includes a diaphragm fixed to the basin frame. A rear shell of the basin frame away from the diaphragm and spaced from the sound emitting unit and a side wall extending from the periphery of the rear shell in the direction of the diaphragm, the side wall surrounding the peripheral side of the basin frame ; The thickness of the shell is less than the thickness of the basin frame;

The side wall is attached to the basin frame, or the side wall is spaced from at least one side of the basin frame, and the space is less than 3 times the thickness of the housing;

The rear housing, the side walls, and the sounding monomer jointly enclose the rear sound cavity, the sounding monomer is provided with a leaking portion communicating with the rear sound cavity, and the housing is provided with a through hole A leak hole, which communicates the rear acoustic cavity with the outside world.
The sounding device according to claim 1, wherein the housing further comprises a base attached and fixed to a side of the basin frame close to the diaphragm, and the base is provided with a sounding hole passing through it, The sound hole is in communication with the diaphragm, and the end of the side wall away from the rear case is connected to and sealed with the base.
The sounding device according to claim 1, wherein the side wall extends toward the inner side thereof to form a boss, and the side of the sound emitting unit facing the rear case abuts against the boss and forms a seal.
The sounding device according to claim 1, wherein the housing comprises a first part and a second part which are separately arranged on opposite sides of the sounding monomer along a vibration direction perpendicular to the diaphragm, so The housing is formed by splicing the first part and the second part.
The sound emitting device according to claim 1, wherein the ratio of the thickness of the shell to the thickness of the basin frame is less than 0.4.
The sound emitting device according to claim 1, wherein the housing is made of metal material.
7. The sound emitting device of claim 6, wherein the housing is at least partially grounded.
7. The sound generating device according to claim 6, wherein the sound generating device further comprises a conductive member, one end of the conductive member is electrically connected to the housing, and the other end of the conductive member is used for grounding.
8. The sound emitting device according to claim 8, wherein the conductive member is formed by extending the housing.
The sound emitting device according to claim 6, 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 For external electrical signals, the other electrical channel is used to connect the housing and the ground.
The sounding device according to claim 1, wherein the sounding 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 housing, and One end of the positioning piece away from the housing is provided with a positioning hole penetrating through it.
The sound emitting device according to claim 11, wherein the positioning piece is formed by extending outward from the casing.
The sounding device according to claim 1, wherein the sounding device further comprises a conductive terminal, the rear shell is further provided with a connection hole penetrating therethrough, and the conductive terminal is at least partially located in the connection hole It is exposed on the rear shell for electrical connection with an external circuit.
The sound emitting device according to claim 1, wherein the shell is made of steel sheet with a thickness of 0.15 mm.
The sounding device according to claim 1, wherein the sounding monomer further comprises a front cover which is arranged on a side of the basin frame close to the diaphragm and surrounds the diaphragm with a front sound cavity, so The front cover is provided with a through hole penetrating the diaphragm along the vibration direction of the diaphragm, and the through hole connects the front acoustic cavity with the outside.
The sounding device according to claim 2, characterized in that, the sounding device further comprises a front cover arranged on a side of the basin frame close to the diaphragm and enclosing a front sound cavity with the diaphragm, and The front cover is provided with a through hole extending along the vibration direction of the diaphragm, and the through hole connects the front acoustic cavity with the outside; the base is pressed and fixed on the periphery of the front cover away from the diaphragm On one side, the front cover passes through the sound hole and is exposed to the base.
The sound emitting device according to claim 15 or 16, wherein the sound emitting device further comprises a breathable damping member attached to the front cover, and the breathable damping member completely covers the through hole.
The sounding device according to claim 15 or 16, wherein the portion of the diaphragm fixed to the basin frame is provided with a ring-shaped sealing boss protruding toward the front cover, and the The front cover is pressed on the sealing boss to form a seal.
The sounding device according to claim 2, wherein the part of the diaphragm fixed to the basin frame is provided with a ring-shaped sealing boss protruding in a direction close to the base, and the base is pressed against A seal is formed on the sealing boss.
The sound-emitting device according to claim 1, wherein the sound-emitting device comprises a sound-conducting shell covering a side of the sound-emitting monomer away from the rear shell, and the sound-conducting shell has a side sound-emitting structure. A sound guide cavity, the sound guide cavity is in communication with the diaphragm.
The sounding device according to claim 1, wherein the housing and the sounding monomer further enclose a sound guide cavity forming a side sounding structure, and the sound guide cavity is in communication with the diaphragm.
The sounding device according to claim 1, wherein the sounding device further comprises a gas-permeable isolator located in the rear acoustic cavity, and the gas-permeable isolator is attached to the sounding unit and the sounding unit The body is separated from the rear acoustic cavity.
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, A spacer extension part bent and extended from the periphery of the spacer body in the direction of the rear shell, and a spacer fixing part bent and extended from one end of the spacer extension part away from the spacer body; the spacer The extension part of the element is spaced apart from the side wall, and the fixing part of the spacer is fixed to the rear shell; the air-permeable spacer and the rear shell jointly enclose a powder filling space.
The sounding device according to claim 23, 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, the avoiding step and the leaking portion Set it right.
The sounding device according to claim 1, wherein the ratio of the orthographic projection of the sounding monomer to the rear case along the vibration direction of the diaphragm to the projected plane area of the rear case is at least 4/5 .
The sounding device according to claim 1, wherein the interval is less than or equal to 1/3 of the width of the fixing surface of the diaphragm fixed to the basin frame.