WO2021237790A1

WO2021237790A1 - Sound production device

Info

Publication number: WO2021237790A1
Application number: PCT/CN2020/094700
Authority: WO
Inventors: 曹成铭; 吴树文
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: CN212628370U

Abstract

The present utility model provides a sound production device, comprising a housing having an accommodation space, a sound production unit accommodated in the accommodation space, and a bracket; wherein the sound production unit comprises a diaphragm; a base comprises a base plate covering and fixed to the side of the sound production unit close to the diaphragm, and a base extension wall; a rear housing comprises a rear housing plate located on the side of the sound production unit away from the diaphragm and spaced apart from the sound production unit, and a rear housing extension wall formed by bending and extending the rear housing plate; the bracket comprises a connection part sandwiched and fixed between the rear housing extension wall and the base extension wall, and a fixing part formed by protruding of the connection part; the fixing part is simultaneously attached and fixed to the base extension wall and the rear housing extension wall; the sound production unit divides the accommodation space into a front sound cavity and a rear sound cavity; the base is provided with a sound production port, and the sound production port enables the front sound cavity to be communicated with the outside; the rear housing is provided with a leakage hole, and the leakage hole enables the rear sound cavity to be communicated 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 housing with a receiving space and a sound emitting unit accommodated in the receiving space, and the sound emitting unit includes a diaphragm for vibrating and sounding.

The housing includes a base and a rear housing respectively covering opposite sides of the sound-producing monomer along the vibration direction of the diaphragm;

The base includes a base plate that is covered and fixed on a side of the sounding unit close to the diaphragm, and a base plate bent and extended from the outer peripheral edge of the base plate along the peripheral side of the sounding unit in the direction of the rear shell Base extension wall;

The rear shell includes a rear shell plate located on the side of the sound emitting unit away from the diaphragm and spaced from the sound emitting unit, and the peripheral edge of the rear shell plate extends along the circumference of the sound emitting unit. The extension wall of the rear shell that is bent and extended in the direction of the extension wall of the base;

The sounding device further includes a bracket sandwiched between the base and the rear shell, the bracket includes a connecting portion sandwiched and fixed between the extension wall of the rear shell and the extension wall of the base, and A fixing portion formed by a protrusion in a direction away from the sound emitting unit, and the fixing portion is attached and fixed to the extension wall of the base and the extension wall of the rear shell at the same time;

The sounding monomer separates the containing space to form a front sound cavity and a rear sound cavity, the base is provided with a sounding port passing through it, and the sounding port communicates the front sound cavity with the outside; the sounding monomer is provided with The leakage part communicated with the rear acoustic cavity, the rear shell is provided with a leakage hole penetrating therethrough, and the leakage hole communicates the rear acoustic cavity with the outside.

Preferably, the bracket is made of plastic.

Preferably, the connecting portion is respectively fixed to the extension wall of the base and the extension wall of the rear shell by ultrasonic welding.

Preferably, the sound-emitting unit includes a basin frame, a vibration system respectively supported and fixed to the basin frame, and a magnetic circuit system that drives the vibration system to vibrate and produce sound.

Preferably, the housing is made of metal material.

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

Preferably, the housing is at least partially grounded.

Preferably, the sound emitting device further includes a conductive member, one end of the conductive member is 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 emitting device further includes at least two positioning pieces, the two positioning pieces are connected to opposite sides or two diagonal corners of the casing, and the positioning piece is provided with one end away from the casing Through the positioning hole on it.

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

Preferably, the base extension wall and the rear shell extension wall are spaced apart from the basin frame, and the distance between the base extension wall and the basin frame is less than or equal to that the diaphragm is fixed to the basin 1/3 of the width of the fixed surface of the frame.

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

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 rear shell is at least 4/5.

Preferably, the sound emitting device further includes a front cover press-fitted in front of the diaphragm, the front cover and the diaphragm surround the front acoustic cavity, and the front cover is provided with penetrating through it along the vibration direction. The sound hole connects the front sound cavity with the outside; the base plate is pressed and fixed on the periphery of the front cover, and the front cover passes through the sound opening and is exposed to the outside Pedestal.

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

Preferably, the sound generating device further includes a first air-permeable damping member attached to the front cover, and the first air-permeable damping member completely covers the sound 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 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 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 plate 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 rear shell extension wall and the base extension wall are attached to the basin frame, or the rear shell extension wall and the base extension wall are spaced from at least one side of the basin frame, and The interval is less than 3 times the thickness of the casing.

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.

Beneficial effect

Compared with the related art, the sound generating device of the present invention includes a housing having a housing space and a sound generating unit accommodated in the housing space. On opposite sides of the sounding monomer, the bracket is sandwiched between the base and the rear shell, and the sounding monomer separates the receiving space to form a front sound cavity and a rear sound cavity. The rear shell is provided with a leak hole to connect the rear sound cavity to the outside Connected, the above-mentioned structure forms a sealed rear acoustic cavity structure, which is not only simple in structure, and the overall horizontal dimension perpendicular to the direction of vibration is small, but also makes the acoustic effect of the sound device better, and makes the base and the rear shell can be used for vibration absorption, thereby making The acoustic effect of the sounding device is better, and the closed rear acoustic cavity structure enables the sounding device to avoid the occurrence of shell vibration after being used in a mobile terminal, so that the user experience effect is better; at the same time, the bracket includes a clip fixed to the rear The connecting portion between the extension wall of the shell and the extension wall of the base and the fixing portion formed by the connecting portion protruding away from the sound emitting unit, and the fixing portion is attached and fixed to the extension wall of the base at the same time. The extension wall of the rear shell, that is, the connecting part is sandwiched and fixed between the extension wall of the rear shell and the extension wall of the base to form a support, and the fixing part is attached and fixed to the extension wall of the base and the extension wall of the rear shell at the same time. The sealing is formed, so that the reliability and sealing of the entire sound emitting device are 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 an exploded schematic diagram of another part of the three-dimensional structure of the sound device of the present invention;

Figure 4 is a cross-sectional view taken along line A-A in Figure 1;

Figure 5 is an enlarged view of B in Figure 4;

Figure 6 is a cross-sectional view of another embodiment of the sound generating device of the present invention;

FIG. 7 is a cross-sectional view of another derivative embodiment of FIG. 6;

FIG. 8 is a schematic diagram of a three-dimensional structure of still another embodiment of the sound generating 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 cross-sectional view of another embodiment of Fig. 4;

Fig. 11 is a schematic structural diagram of the sound generating device shown in Fig. 4 with a breathable spacer added;

FIG. 12 is a schematic structural diagram of a derivative embodiment of the embodiment shown in FIG. 11;

FIG. 13 is a schematic structural diagram of the middle diaphragm of the sound emitting device shown in FIG. 1 provided with a sealing boss;

FIG. 14 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.

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

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. 1-5 at the same time. The present invention provides a sound emitting device 100, which includes a housing 50 having a receiving space 40, a sound emitting unit 30, a bracket 6, a front cover 7, and a housing 50 accommodated in the receiving space 40. The first breathable damping member 8.

The sound unit 30 separates the containing space 40 to form a front sound cavity 20 and a rear sound cavity 10, which include a basin frame 1, a vibration system 2 and a magnetic circuit system 3, the vibration system 2 and the magnetic circuit system 3 are respectively supported and fixed In the basin frame 1, the magnetic circuit system 3 drives the vibration system 2 to vibrate and produce sound. The vibration system 2 and the magnetic circuit system 3 are respectively supported and fixed to the basin frame 1 and jointly enclose a sounding cavity 3a.

The vibration system 2 includes a diaphragm 21 fixed to the basin frame 1, and the diaphragm 21 is used for vibrating and sounding.

The magnetic circuit system 3 includes a groove 31 recessed on the side away from the diaphragm 21, a leakage portion 32 penetrating through the groove 31, and a leakage portion 32 attached to the groove 31 and completely covering the leakage portion. The second air-permeable damping member 33 of 32 is used to balance the air pressure.

Specifically, the magnetic circuit system 3 is rectangular, the groove 31, the leakage portion 32, and the second air-permeable damping member 33 all include four and one-to-one correspondence, and the four grooves 31 are respectively provided At the four right angles of the magnetic circuit system 3.

The housing 50 includes a base 4 and a rear housing 5, and the base 4 and the rear housing 5 are respectively covered on opposite sides of the sound emitting unit 30 along the vibration direction of the diaphragm 21. In this embodiment, The base 4 and the rear shell 5 are respectively covered on opposite sides of the basin frame 1 along the vibration direction of the diaphragm 21.

The base 4 includes a base plate 41 that is covered and fixed on the side of the basin frame 1 close to the diaphragm 21, and the outer peripheral edge of the base plate 41 is directed toward the rear shell 5 along the circumference of the basin frame 1. The base extension wall 42 is bent and extended in the direction. The base plate 41 includes a sounding opening 410 passing through it. The sounding opening 410 connects the front sound cavity 20 with the outside world. Front sounding structure; of course, the sounding port 410 is not limited to being provided on the base plate 41, and can also be provided on the base extension wall 42 according to actual needs.

The rear shell 5 includes a rear shell plate 51 located on the side of the basin frame 1 away from the diaphragm 21 and spaced from the basin frame 1, and a peripheral edge of the rear shell plate 51 along the basin frame 1 circumference. The rear shell extension wall 52 is bent and extended laterally in the direction of the base extension wall 42. The rear shell plate 51 includes a leakage hole 510 passing through it, and the leakage hole 510 communicates the rear acoustic cavity 10 with the outside; of course, the leakage hole The 510 is not limited to being arranged on the rear shell plate 51, and may also be arranged on the rear shell extension wall 52 according to actual needs. The rear shell extension wall 52 and the base extension wall 42 are attached to the basin frame 1, or the rear shell extension wall 52 and the base extension wall 42 are provided on at least one side of the basin frame 1. The interval is less than 3 times the thickness of the casing 50. The area ratio of the orthographic projection of the sounding monomer 30 to the rear shell 5 along the vibration direction of the diaphragm 21 to the rear shell 5 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.

The ratio of the thickness of the shell 50 to the thickness of the basin frame 1 is less than 0.4, so that while the structural strength of the shell 50 is satisfied, the size of the sound emitting device 100 along the direction perpendicular to the vibration is increased as little as possible; While the structural strength of the basin frame 1 is guaranteed, it occupies as little space as possible.

In this embodiment, the rear shell extension wall 52 and the base extension wall 42 are arranged directly opposite. Specifically, the extension direction of the rear shell extension wall 52 is parallel to the vibration direction of the diaphragm 21, and the extension direction of the base extension wall 42 is parallel to the vibration direction of the diaphragm 21.

The bracket 6 is sandwiched between the rear shell extension wall 52 and the base extension wall 42, and the bracket 6 includes a bracket fixed between the rear shell extension wall 52 and the base extension wall 42. A connecting portion 62 and a fixing portion 61 formed by the connecting portion 62 protruding away from the sound emitting unit 30, and the fixing portion 61 is attached and fixed to the base extension wall 42 and the rear shell extension wall at the same time 52.

Specifically, the connecting portion 62 is sandwiched and fixed between the rear shell extension wall 52 and the base extension wall 42 to form a support, and the fixing portion 61 is attached and fixed to the base extension wall 42 and the base extension wall 42 at the same time. The outer side of the extension wall 52 of the rear shell makes the base extension wall 42 and the extension wall 52 of the rear shell form a seal, that is, only one support 6 is used to support and seal at the same time, and the cost is more economical, the connection is firmer, and the seal Better results.

The rear housing 5, the base 4, the support 6, the basin frame 1 and the magnetic circuit system 3 jointly enclose the rear acoustic cavity 10, and the leaking portion 32 communicates with the rear acoustic cavity 10 so as to pass through the The leakage portion 32 connects the sounding cavity 3a with the rear acoustic cavity 10 to improve low-frequency acoustic performance. The leakage hole 510 connects the rear acoustic cavity 10 with the outside, and is used to balance the sound pressure. 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 , So that the sound generating device 100 will not cause the shell vibration phenomenon of the electronic product such as the mobile terminal after being used in the electronic product such as the mobile terminal, which effectively increases the user experience effect of the customer.

In this embodiment, the bracket 6 is made of plastic. The base 4 and the back shell 5 can be made of any one of metal, ceramics and glass. In this embodiment, the base 4 and the back shell 5 are made of metal materials, both of which are made of 0.15 Made of mm thick steel sheet. Compared with other materials, the base 4 and the rear shell 5 made of metal materials are thinner and stronger. At this time, the shell 50 is at least partially grounded to form a shielding cover to avoid external electromagnetic interference. Reliability is better. The connecting portion 62 is respectively fixed to the base extension wall 42 and the rear housing extension wall 52 by ultrasonic welding.

Both the base extension wall 42 and the rear shell extension wall 52 are spaced apart from the basin frame 1 to increase the volume of the rear acoustic cavity 10 and further improve the acoustic performance. Specifically, the distance between the base extension wall 42 and the basin frame 1 is less than or equal to 1/3 of the width of the fixing surface of the diaphragm 21 fixed to the basin frame 1, and the rear shell extension wall 52 The distance to the basin frame 1 is less than or equal to 1/3 of the width of the fixing surface of the diaphragm 21 fixed on the basin frame 1 to facilitate assembly. If the gap is too large, it will cause deviation and affect the performance of the product.

In this embodiment, the sound generating device 100 further includes a front cover 7 pressed in front of the diaphragm 21, the front cover 7 and the diaphragm 21 enclose a front acoustic cavity 20, and the front cover 7 is provided with a rim The vibration direction penetrates through the acoustic hole 71 thereon, and the acoustic hole 71 connects the front acoustic cavity 20 with the outside. This structural arrangement improves the mid-frequency and high-frequency performance of the sound emitting device 100. The base plate 41 is pressed and fixed to the periphery of the front cover 7, and the front cover 7 passes through the sounding opening 410 and is exposed to the base 4. Alternatively, the front cover 7 is not a part of the structure of the sounding device 100, but a part of the sounding unit 30. For example, the sounding unit 30 also includes a cover provided on the side of the basin frame 1 close to the diaphragm 21 and The front cover 7 of the front acoustic cavity 10 encloses the diaphragm 21, and the front cover 7 is provided with a sound hole 71 passing through it along the vibration direction, and the sound hole 71 connects the front sound cavity 10 with Externally connected, the front cover 7 is a part of the structure of the sounding monomer 30, that is, the sounding monomer 30 has its own front cover 7.

The sound holes 71 include a plurality and are arranged in an array to improve sound stability and balance.

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 first air-permeable damping member 8 attached to the front cover 7, and the first air-permeable damping member 8 completely covers the sound hole 71 . The vibration and sound produced by the diaphragm 21 pass through the sound opening 410, the sound hole 71 and the first air-permeable damping member 8 to the outside in sequence.

Because the part (ie, the glued surface) of the diaphragm 21 fixed to the basin frame 1 has a small area and a narrow width, the reliability of sealing is poor. Therefore, in this embodiment, please refer to FIG. 13 as shown in FIG. 13a. In the sound generating device 100, the part of the diaphragm 21 fixed to the basin frame 1 is arranged in a direction close to the front cover 7. The protruding ring-shaped sealing boss 211, when assembling, the front cover 7 is pressed on the sealing boss 211 and the sealing boss 211 is compressed to form a seal, and the sealing reliability is better. Or, as shown in FIG. 13b, in the sound generating device 100', the portion of the diaphragm 21' fixed to the basin frame 1'is provided with a ring-shaped sealing protrusion protruding in the direction close to the base 4' Taiwan 211'. When assembling, the base 4'is pressed on the sealing boss 211' and the sealing boss 211' is compressed to form a seal, which has better sealing reliability.

Please refer to FIG. 6, which is a cross-sectional view of another embodiment of the sound generating device of the present invention. The main difference in this embodiment is that the base 54 and the rear shell 55 are both made of metal materials, and a conductive member 501 is provided. For example, both the base 54 and the rear shell 55 are made of 0.15 mm thick steel sheet. The base 54 and the rear shell 55 are made of metal materials and can be made thinner with the same structural strength, thereby further reducing the horizontal size of the sound generating device 500 along the direction of vibration.

Specifically, the sound emitting device 500 further includes a conductive member 501, one end of the conductive member 501 is connected to the base 54 and/or the rear case 55, and the other end of the conductive member 501 is used for grounding, thereby forming The shielding effect prevents the vocal unit 500 from external electromagnetic interference and has better working reliability.

Please refer to FIG. 7, which is a cross-sectional view of another derivative embodiment of FIG. 6. In the sound generating device 600, the conductive member 601 and the base 64 and/or the rear shell 65 are integrated, for example, The conductive member 601 is formed by extending the base 64 and/or the rear shell 65 in a direction away from the basin frame, and is located outside the base 64 and the rear shell 65.

Please refer to Figs. 8-9, which are a schematic diagram of the three-dimensional structure of another embodiment of the sound generating device of the present invention. The difference between this embodiment and the embodiment shown in FIG. 5 lies in that the structure and function of the conductive member 701 in the sound emitting device 700 are different. The conductive member 701 includes two electrical pathways, one of the electrical pathways is used to connect the vocal unit 702 with an external electrical signal for supplying power to the vocal unit 702, and the other is the electrical pathway It is used to connect the housing 703 and the ground to form a shield for the sound emitting unit 702. In this embodiment, the conductive member 701 is used to form a shielding effect together with the housing 703, and is also used to supply power to the sound generating unit 702, which has a simpler structure and can achieve dual functions.

Specifically, the rear shell 75 includes a gap 7520 penetrating therethrough, and the conductive member 701 includes a first arm 7011 fixed to the gap 7520, extending from opposite ends of the first arm 7011 in the direction of the basin frame 71 The second arm 7012, a third arm 7013 extending from the first arm 7011 in a direction away from the basin frame 71, and a fourth arm 7014 extending from the first arm 7011 in a direction away from the basin frame 71. The third arm 7013 is formed by extending the first arm 7011 perpendicular to the direction of vibration, and the fourth arm 7014 is bent from the first arm 7011 in the direction of vibration and close to the rear shell 75. Fold and extend to form.

The first arm 7011 is electrically connected to the base 74 and/or the rear shell 75, that is, is electrically connected to the base extension wall 743 and/or the rear shell extension wall 752; the second arm 7012 is fixed The base frame 71 is electrically connected to the sound emitting unit 702; the third arm 7013 is used for connecting external electrical signals; the fourth arm 7014 is used for grounding.

As shown in FIG. 10, FIG. 10 is a cross-sectional view of another embodiment of FIG. 4. The main difference lies in that the sound emitting device 800 emits sound from the front side to form a side sound emitting structure.

The sound-emitting device 800 includes a sound-guiding shell 801 covering the side of the sound-emitting unit 86 away from the rear shell 85. The sound-guiding shell 801 has a sound-guiding cavity 820 forming a side sound-emitting structure 830. The sound-guiding cavity 820 is in communication with the diaphragm 821. The side sound structure 830 can better guide the sound, which is convenient for use when the front sound is blocked, and the use flexibility is higher. Specifically, the sound conducting shell 801 is located on the side of the base 84 away from the rear shell 85. Specifically, the sound conducting shell 801 includes a sound conducting shell plate 8011 spaced apart and opposed to the base plate 841, and the sound conducting shell plate 8011 is bent and extended toward the base extension wall 842 and supported and fixed to the base plate 841. The sound conducting shell on the periphery of the base plate 841 extends the wall 8012 to form a side sounding structure, which is convenient for flexible use of different installation positions. At this time, it is understood that the sound conducting shell 801 is a component of the sound emitting device 800, and does not belong to the housing 845.

When the sound conducting shell 801 is understood as a part of the shell 845, it is also feasible, that is, the sound conducting shell 801 can be a part of the shell 845. In this case, the shell 845 and the sound emitting unit 86 also encloses a sound guide cavity 820 forming a side sound emitting structure 830, and the sound guide cavity 820 is in communication with the diaphragm 821.

As shown in FIG. 11, the sound generating device 900 further includes a gas-permeable spacer 907 located in the rear acoustic cavity 9010, and the gas-permeable spacer 907 includes a spacer body 9071 arranged opposite to the rear shell plate 9011. A spacer extension portion 9072 bent and extended in the direction of the rear shell plate 9011 from the periphery of the spacer body 9071, and a spacer extension portion 9072 bent and extended from an end of the spacer extension portion 9072 away from the spacer body 9071 Fixing part 9073.

The spacer extension portion 9072 is spaced apart from the rear shell extension wall 9012, the spacer fixing portion 9073 is fixed to the rear shell panel 9011; the air-permeable spacer 907 and the rear shell panel 9011 are enclosed together Powder filling space 901. Wherein, the structure in which the spacer extension 9072 and the rear shell extension wall 9012 are spaced apart can effectively increase the smoothness of ventilation of the rear acoustic cavity 9010 and improve the stability of low-frequency sound performance.

Please refer to FIG. 12, which is a schematic structural diagram of a derivative embodiment of the embodiment shown in FIG. 11. In the sounding device 900a, the side of the isolator body 9071a close to the sounding unit 902a is recessed in a direction away from the sounding unit 902a to form an avoiding step 9074a, and the avoiding step 9074a is directly opposite to the leakage portion 9024a. Pair set. This structural arrangement can make the leakage of the sounding cavity 9104a of the sounding monomer 902a smoother, thereby improving the sounding performance.

Please refer to FIG. 14, which is a schematic structural diagram of a derivative embodiment of the embodiment shown in FIG. 1. The sound generating device 1000a also has at least two positioning pieces 8a which are respectively connected to the housing 1001a. One end of the positioning piece 8a away from the housing 1001a is provided with a positioning hole 81a penetrating through it, which is used to fix and position the sound emitting device 1000a with the application terminal, such as a threaded hole. The positioning can be passed through the use of screws The hole 81a is fixed on the terminal device, which is simple and convenient, and the positioning piece 8a is provided with at least two positioning pieces to form a positioning fixation more effectively. In order to further improve the fixing stability, the two positioning pieces 8a are connected to opposite sides or two diagonal corners of the housing 1001a, and the symmetrical arrangement makes the sound generating device 1000a and the whole terminal have a better positioning and fixing effect. In this embodiment, the positioning piece 8a is fixed to the housing 1001a by welding, that is, the positioning piece 8a and the housing 1001a are a separate structure of two devices.

Please refer to FIG. 15, which is a schematic structural diagram of a derivative embodiment of the embodiment shown in FIG. 14. The difference from the embodiment shown in FIG. 13 is that in the sound generating device 1100a in this embodiment, the positioning piece 1118a is formed by extending outward from the housing 1111a, that is, the positioning piece 1118a and the housing 1111a are integrally formed The structure is simple to form, reduces the number of components, and improves assembly efficiency.

Compared with the related art, the sound generating device of the present invention includes a housing having a housing space and a sound generating unit accommodated in the housing space. On opposite sides of the sounding monomer, the bracket is sandwiched between the base and the rear shell, and the sounding monomer separates the receiving space to form a front sound cavity and a rear sound cavity. The rear shell is provided with a leak hole to connect the rear sound cavity to the outside Connected, the above structure forms a sealed rear acoustic cavity structure, which is not only simple in structure, small increase in overall size, but also allows the base and rear shell to be used for vibration absorption, so that the acoustic effect of the sound device is better, and the closed rear acoustic cavity structure makes the sound After the device is used in a mobile terminal, the occurrence of case vibration is avoided, and the user experience is better; at the same time, the bracket includes a connecting portion clamped and fixed between the extension wall of the rear case and the extension wall of the base. The connecting portion is a fixing portion formed by protruding away from the sound emitting unit, and the fixing portion is attached and fixed to the base extension wall and the rear shell extension wall at the same time, that is, the connecting portion is clamped and fixed to the rear shell extension A support is formed between the wall and the extension wall of the base, and the fixing part is attached and fixed to the extension wall of the base and the extension wall of the rear shell at the same time to form a seal, so that the reliability and sealing of the entire sound emitting device are 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 sound emitting device, which comprises a housing having a containing space and a sound emitting unit accommodated in the containing space, the sound emitting unit including a diaphragm for vibrating and sounding, and is characterized in that:

The housing includes a base and a rear housing respectively covering opposite sides of the sound-producing monomer along the vibration direction of the diaphragm;

The base includes a base plate that is covered and fixed on a side of the sounding unit close to the diaphragm, and a base plate bent and extended from the outer peripheral edge of the base plate along the peripheral side of the sounding unit in the direction of the rear shell Base extension wall;

The rear shell includes a rear shell plate located on the side of the sound emitting unit away from the diaphragm and spaced from the sound emitting unit, and the peripheral edge of the rear shell plate extends along the circumference of the sound emitting unit. The extension wall of the rear shell that is bent and extended in the direction of the extension wall of the base;

The sounding device further includes a bracket sandwiched between the base and the rear shell, the bracket includes a connecting portion sandwiched and fixed between the extension wall of the rear shell and the extension wall of the base, and A fixing portion formed by a protrusion in a direction away from the sound emitting unit, and the fixing portion is attached and fixed to the extension wall of the base and the extension wall of the rear shell at the same time;

The sounding monomer separates the containing space to form a front sound cavity and a rear sound cavity, the base is provided with a sounding port passing through it, and the sounding port communicates the front sound cavity with the outside; the sounding monomer is provided with The leakage part communicated with the rear acoustic cavity, the rear shell is provided with a leakage hole penetrating therethrough, and the leakage hole communicates the rear acoustic cavity with the outside.
The sound emitting device according to claim 1, wherein the bracket is made of plastic.
The sounding device according to claim 1, wherein the connecting portion is fixed to the extension wall of the base and the extension wall of the rear shell respectively by ultrasonic welding.
The sounding device according to claim 1, wherein the sounding unit comprises a basin frame, a vibration system respectively supported and fixed to the basin frame, and a magnetic circuit system that drives the vibration system to vibrate and produce sound.
The sounding device according to claim 4, wherein the housing is made of a metal material.
The sound emitting device according to claim 5, wherein the housing is made of a 0.15mm thick steel sheet.
The sound emitting device according to claim 5, wherein the housing is at least partially grounded.
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 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 5, wherein the sound emitting device further comprises a conductive member, and 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 sound emitting device according to claim 5, wherein the sound emitting device further comprises at least two positioning pieces, and the two positioning pieces are connected to opposite sides or two diagonal corners of the casing, and One end of the positioning piece far away from the casing 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 4, wherein the base extension wall and the rear shell extension wall are both spaced apart from the basin frame, and the distance between the base extension wall and the basin frame is less than Or equal to 1/3 of the width of the fixed surface of the diaphragm fixed to the basin frame.
The sound emitting device according to claim 4, wherein the ratio of the thickness of the shell to the thickness of the basin frame is less than 0.4.
The sounding device according to claim 1, 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 rear case is at least 4/5.
The sound emitting device according to claim 1, wherein the sound emitting device further comprises a front cover pressed in front of the diaphragm, the front cover and the diaphragm surround the front acoustic cavity, and The front cover is provided with a sound hole penetrating it along the vibration direction, and the sound hole connects the front sound cavity with the outside; the base plate is pressed and fixed on the periphery of the front cover, and the front cover Passing through the sound outlet and exposed on the base.
The sounding device according to claim 4, wherein the sounding monomer further comprises a front cover which is arranged on the side of the basin frame close to the diaphragm and surrounds the front sound cavity with the diaphragm The front cover is provided with a sound hole penetrating the front cover along the vibration direction, and the sound hole connects the front sound cavity with the outside.
The sounding device according to claim 16 or 17, wherein the sounding device further comprises a first air-permeable damping member attached to the front cover, and the first air-permeable damping member completely covers the sound hole.
The sounding device according to claim 16 or 17, wherein 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 The front cover is pressed on the sealing boss to form a seal.
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 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 plate jointly enclose a powder filling space.
The sounding device according to claim 22, 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 leakage portion Set it right.
The sounding device according to claim 4, wherein the extension wall of the rear shell and the extension wall of the base are attached to the basin frame, or the extension wall of the rear shell and the extension wall of the base are attached to the At least one side of the basin frame is provided with an interval, and the interval is less than 3 times the thickness of the shell.
The sounding device according to claim 4, wherein the portion of the diaphragm fixed to the basin frame is provided with a ring-shaped sealing boss protruding in a direction closer to the base, and the base is press-fitted A seal is formed on the sealing boss.