Acoustic device and electronic apparatus

Abstract

The utility model relates to the technical field of electroacoustic conversion, in particular to an acoustic device and electronic equipment, the acoustic device comprises a shell, a sounding unit and a plurality of flexible parts, the shell is provided with an accommodating cavity, and the shell is provided with a first sound hole; the sound production unit is arranged in the accommodating cavity, a rear cavity is separated from the accommodating cavity, and sound waves of the sound production unit are radiated to the outside of the shell through the first sound hole; the plurality of flexible parts are arranged in the rear cavity and divide the rear cavity into a first cavity body and a plurality of second cavity bodies, at least part of the first cavity body takes the sound production unit as a side wall, and each flexible part is located between the first cavity body and one second cavity body. Through the arrangement, the equivalent sound order of the first accommodating cavity can be increased, so that the resonant frequency of the acoustic device is effectively reduced, and the low-frequency sensitivity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electroacoustic conversion, in particular to an acoustic device and an electronic device applied to the acoustic device. Background Art

[0002] With the rapid development of electronic devices (such as mobile phones, tablet computers, etc.), higher requirements are placed on the performance of their internal acoustic devices. When the core size of the sound-generating unit is constant, the relevant technology achieves the above purpose by filling the back cavity with powder or increasing the volume of the back cavity structure. However, filling the back cavity with powder will cause powder vibration sound, and for small-volume acoustic devices, due to volume restrictions, the volume of the chamber in the acoustic system is also limited, so it is difficult to achieve a satisfactory bass effect. Utility Model Content

[0003] The utility model aims to provide an acoustic device and an electronic device applied to the acoustic device, so as to improve the bass effect of the acoustic device.

[0004] The first aspect of the utility model provides an acoustic device, comprising:

[0005] A shell, the shell having a receiving cavity, and the shell is provided with a first sound hole;

[0006] A sound-generating unit, the sound-generating unit is disposed in the receiving cavity and a rear cavity is separated from the receiving cavity, and sound waves of the sound-generating unit are radiated to the outside of the shell through the first sound hole;

[0007] Multiple flexible parts are arranged in the back cavity and divide the back cavity into a first cavity and multiple second cavities. At least part of the first cavity uses the sound unit as a side wall, and each of the flexible parts is located between the first cavity and one of the second cavities.

[0008] The acoustic device provided by the utility model may also have the following additional technical features:

[0009] In a specific implementation manner of the present invention, in the vibration direction of the diaphragm of the sound-emitting unit, the projections of at least two of the flexible members at least partially overlap.

[0010] In a specific implementation manner of the present invention, the two overlapping flexible members have the same size; and / or, in the vibration direction of the diaphragm of the sound-emitting unit, at least two of the flexible members are arranged opposite to each other.

[0011] In a specific embodiment of the utility model, the flexible member includes a deformation portion and a vibration plate arranged in the middle of the deformation portion, and the plane where the vibration plate is located is perpendicular to or at an angle to the vibration direction of the diaphragm of the sound-emitting unit.

[0012] In a specific embodiment of the present invention, the flexible member includes a first flexible member and a second flexible member, and the shell for forming the second cavity corresponding to the first flexible member is at least partially a shell component of an electronic device.

[0013] In a specific embodiment of the present utility model, the second cavity corresponding to the first flexible member is a closed cavity, and the second cavity corresponding to the second flexible member is a closed cavity;

[0014] Alternatively, a second sound hole is further formed on the shell, and the sound waves of the second cavity corresponding to the second flexible member are radiated to the outside through the second sound hole, and the second cavity corresponding to the first flexible member is a closed cavity;

[0015] And / or, a ratio of the volume of the second cavity corresponding to the first flexible member to the volume of the rear cavity is greater than 0.5.

[0016] In a specific embodiment of the present invention, a second sound hole is further formed on the shell, and the sound waves of the second cavity corresponding to the second flexible member are radiated to the outside through the second sound hole, and the first sound hole and the second sound hole are located on the same side of the shell.

[0017] In a specific embodiment of the utility model, the shell includes a first shell having a mounting hole and a second shell forming a receiving space with the first shell, the sound unit is arranged in the receiving space, the first flexible member cover is arranged at the mounting hole, the first shell, the first flexible member and the shell assembly are combined to form a second cavity, and the second flexible member is arranged between the first shell and the second shell.

[0018] In a specific embodiment of the present invention, the second shell has a first installation position, the sound-emitting unit is installed at the first installation position, and is enclosed together with the first shell, the second shell and the plurality of flexible members to form the first cavity.

[0019] In a specific implementation manner of the present invention, a second installation position is further provided on the second shell, the second flexible member is installed at the second installation position, and a second cavity is formed between the second flexible member and the second shell.

[0020] The second aspect of the utility model further provides an electronic device, which comprises a shell assembly and any one of the acoustic devices described above.

[0021] The acoustic device proposed in the embodiment of the utility model includes a shell, a sound unit and a plurality of flexible parts. When the sound unit is working, the forward sound wave of the sound unit is transmitted to the outside of the shell through the first sound hole, forming a first sound signal radiating outward. At the same time, the reverse sound wave of the sound unit will reach the first cavity of the rear cavity of the sound unit, and be transmitted to the flexible part through the air in the first cavity, thereby driving the vibration of the plurality of flexible parts. When the flexible part vibrates, the internal sound pressure of the first cavity changes, and the plurality of flexible parts are deformed with the sound pressure change of the first cavity, and the volume size of the first cavity is flexibly adjusted, thereby increasing the equivalent acoustic compliance of the first cavity, effectively reducing the resonance frequency of the acoustic device, and improving the low-frequency sensitivity. Compared with the sound-emitting devices in the related art, since the sound-emitting device in this embodiment is provided with multiple flexible parts in the rear cavity, thereby increasing the adjustment range of the first cavity, under the same performance, the virtual volume of the rear cavity of the sound-emitting device in this embodiment can be made larger, thereby reducing the overall size of the sound-emitting device, and under the same appearance, the sound-emitting device in this embodiment has lower power consumption and better bass effect; in addition, since the vibrations of multiple flexible parts can offset each other, the sound-emitting device in this embodiment can further reduce the shell vibration and reduce the powder vibration sound caused by powder filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the structure of an acoustic device in a specific implementation mode of the utility model;

[0024] Figure 2 for Figure 1 A transverse cross-sectional view of the mesoacoustic device;

[0025] Figure 3 for Figure 1 A longitudinal cross-sectional view of the mesoacoustic device;

[0026] Figure 4 A longitudinal cross-sectional view of an acoustic device in another specific embodiment of the utility model;

[0027] Figure 5 for Figure 4 Exploded view of the acoustic device.

[0028] Description of reference numerals:

[0029] 100-Acoustic device;

[0030] 10-shell, 10a-front cavity, 10b-first cavity, 10c-third cavity, 10d-fourth cavity; 11-first shell, 111-mounting hole; 12-second shell, 121-first sound outlet hole, 122-second sound outlet hole, 123-second sound outlet channel; 13-shell assembly, 131-first sound hole, 132-second sound hole.

[0031] 20 - sound generating unit, 30 - flexible member, 31 - first flexible member, 32 - second flexible member. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0033] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0034] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0035] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0036] In view of the technical problems mentioned in the background technology, the present invention proposes an acoustic device 100 , aiming to improve the bass performance of the acoustic device 100 .

[0037] It can be understood that the acoustic device 100 proposed in the present invention can be applied to electronic devices, and the electronic devices can be but are not limited to mobile phones, laptop computers, tablet computers, etc.

[0038] like Figure 1-5 As shown, the acoustic device 100 proposed in the embodiment of the utility model includes a shell 10, a sound unit 20 and a plurality of flexible members 30. The shell 10 has a receiving cavity, and a first sound hole 131 is provided on the shell 10; the sound unit 20 is arranged in the receiving cavity, and a rear cavity is separated from the receiving cavity, and the sound waves of the sound unit 20 radiate to the outside of the shell 10 through the first sound hole 131; a plurality of flexible members 30, the plurality of flexible members 30 are all arranged in the rear cavity, and the rear cavity is divided into a first cavity 10b and a plurality of second cavities, at least part of the first cavity 10b uses the sound unit 20 as a side wall, and each flexible member 30 is located between the first cavity 10b and a second cavity.

[0039] The sound unit 20 is a miniature sound unit 20, more specifically, a miniature dynamic speaker. The sound unit 20 generally includes a housing and a vibration system and a magnetic circuit system accommodated in the housing. The vibration system includes a diaphragm fixed to the housing and a voice coil coupled to the diaphragm. The magnetic circuit system forms a magnetic gap, and the voice coil is arranged in the magnetic gap. After the voice coil is supplied with alternating current, it reciprocates up and down in the magnetic field, thereby driving the vibration diaphragm to vibrate and produce sound.

[0040] The sound unit 20 is disposed in the receiving cavity of the shell 10 , and the front side of the diaphragm is connected to the first sound hole 131 , so that the sound waves on the front side of the diaphragm are radiated outward through the first sound hole 131 , and the sound waves on the rear side of the diaphragm are retained in the rear cavity of the acoustic device 100 .

[0041] The flexible member 30 is arranged in the rear cavity and divides the rear cavity into a first cavity 10b and multiple second cavities, and at least part of the first cavity 10b uses the sound unit 20 as a side wall. Each flexible member 30 is located between the first cavity 10b and a second cavity. In this way, the flexible member 30 can vibrate between the first cavity 10b and the corresponding second cavity.

[0042] Under the design of this embodiment, when the sound unit 20 is working, the forward sound wave of the sound unit 20 is transmitted to the outside of the shell 10 through the first sound hole 131, forming a first sound signal radiating outward. At the same time, the reverse sound wave of the sound unit 20 will reach the first cavity 10b of the rear cavity of the sound unit 20, and will be transmitted to the flexible member 30 through the air in the first cavity 10b, thereby driving the multiple flexible members 30 to vibrate. When the flexible members 30 vibrate, the internal sound pressure of the first cavity 10b changes, and the multiple flexible members 30 are deformed with the sound pressure change of the first cavity, and the volume size of the first cavity 10b is flexibly adjusted, thereby increasing the equivalent acoustic compliance of the first cavity, effectively reducing the resonance frequency of the acoustic device 100, and improving the low-frequency sensitivity. Compared with the sound-emitting device in the related art, since the sound-emitting device in this embodiment is provided with a plurality of flexible parts 30 in the rear cavity, thereby increasing the adjustment range of the first cavity 10b, under the same performance, the virtual volume of the rear cavity of the sound-emitting device in this embodiment can be made smaller, thereby reducing the overall size of the sound-emitting device, and under the same appearance, the sound-emitting device in this embodiment has lower power consumption and better bass effect; in addition, since the vibrations of the plurality of flexible parts 30 can offset each other, the sound-emitting device in this embodiment can further reduce the shell vibration and reduce the powder vibration sound caused by powder filling.

[0043] like Figure 4-5 As shown, in a specific embodiment, in the vibration direction of the diaphragm of the sound-emitting unit 20 , the projections of at least two flexible members 30 at least partially overlap.

[0044] The flexible member 30 has a projection in the vibration direction of the diaphragm of the sound unit 20, so that the flexible member 30 can be driven by the reverse sound wave of the sound unit 20 to vibrate. Since the projections of at least two flexible members 30 at least partially overlap, the vibrations of at least two flexible members 30 can influence each other and weaken, thereby effectively reducing the resonance frequency of the acoustic device 100 and improving the low-frequency sensitivity.

[0045] In the same sound-generating device, the flexible members 30 of different areas have different adjustment capabilities, and the flexible members 30 of different positions also have different adjustment capabilities. Therefore, by providing a plurality of flexible members 30 of different areas and positions, a more comprehensive adjustment capability can be achieved.

[0046] Optionally, the two flexible members 30 that overlap in projection in the vibration direction of the diaphragm of the sound-emitting unit 20 have the same size, so that the adjustment capability of the flexible members 30 can be maximized, thereby further optimizing the performance of the acoustic device 100 .

[0047] In a specific embodiment, at least two flexible members 30 are arranged opposite to each other in the vibration direction of the diaphragm of the sound-emitting unit 20. The relative arrangement may refer to partial relative arrangement, that is, the projections of the two flexible members 30 are partially relative to each other, or may refer to complete relative arrangement, that is, one projection is completely included in the other projection. By arranging at least two flexible members 30 opposite to each other, the vibrations of the at least two flexible members 30 can influence each other and weaken each other, thereby effectively reducing the resonance frequency of the acoustic device 100 and improving the low-frequency sensitivity.

[0048] In a specific embodiment, the flexible member 30 includes a deformation portion and a vibration plate disposed in the middle of the deformation portion. The plane where the vibration plate is located is perpendicular to or at an angle to the vibration direction of the diaphragm of the sound-emitting unit 20 .

[0049] Of course, in other embodiments, the flexible member 30 may also adopt other effective and reasonable forms, and those skilled in the art may make reasonable choices according to the requirements of actual application scenarios, which will not be elaborated here.

[0050] The plane where the vibration plate is located is substantially parallel to the plane of the overall structure of the flexible member 30, so the position of the vibration plate plane can basically represent the position of the flexible member 30. The vibration direction of the diaphragm of the sound unit 20 is the thickness direction, and by making the plane where the vibration plate is located perpendicular to or at an angle to the vibration direction of the diaphragm of the sound unit 20, that is, the flexible member 30 is arranged in the length direction of the sound unit 20 as a whole, it is beneficial to the thinning design of the acoustic device 100.

[0051] In a specific embodiment, the flexible member 30 includes a first flexible member 31 and a second flexible member 32 , and the housing 10 for forming a second cavity corresponding to the first flexible member 31 is at least partially a shell component 13 of an electronic device.

[0052] The electronic device may be a mobile phone, a tablet computer, a laptop computer, etc., that is, part or all of the cavity wall used to form the second cavity corresponding to the first flexible member 31 is formed by the shell of the electronic device. By making the shell of the electronic device also serve as the housing 10 of the second cavity corresponding to the first flexible member 31, the space inside the electronic device can be fully utilized, while saving part of the space occupied by the cavity wall, which is more conducive to the thin design of the electronic device.

[0053] The second cavity corresponding to the first flexible member 31 is assumed to be the third cavity 10c, and the second cavity corresponding to the second flexible member 32 is assumed to be the fourth cavity 10d. The shell 10 used to form the third cavity 10c is at least partially a shell component 13 of the electronic device.

[0054] In a specific embodiment, the second cavity corresponding to the first flexible member 31 is a closed cavity, and the second cavity corresponding to the second flexible member 32 is a closed cavity. That is, the third cavity 10c and the fourth cavity 10d are both closed cavities. In this way, the reverse sound waves generated by the diaphragm in the sound unit 20 when deformed will be enclosed in the closed cavity, and then the reverse sound waves generated by the diaphragm can be effectively isolated, avoiding the anti-phase sound waves of the flexible member 30 from canceling the forward radiated sound waves of the sound unit 20, thereby ensuring the sound effect of the acoustic device 100.

[0055] In a specific embodiment, a second sound hole 132 is further formed on the housing 10, and the sound waves of the second cavity corresponding to the second flexible member 32 are radiated to the outside through the second sound hole 132, and the second cavity corresponding to the first flexible member 31 is a closed cavity. That is, the third cavity 10c is a closed cavity, and the fourth cavity 10d is connected to the second sound hole 132.

[0056] In this way, the radiated sound waves of the first flexible member 31 are enclosed in the corresponding second cavity, thereby improving the low-frequency sensitivity of the product. The anti-phase sound waves of the second flexible member 32 are transmitted to the outside of the housing 10 through the corresponding second cavity and the second sound hole 132, forming a second sound signal radiating outward. Since the second sound signal is formed by the directional sound waves of the sound-emitting unit 20 pushing the second flexible member 32 to vibrate, its phase is exactly opposite to the first sound signal, so that it can be coupled with the first sound signal of the sound-emitting unit 20 to offset part of the forward sound waves, thereby achieving a privacy effect. That is, the above-mentioned setting can improve the privacy effect while improving the bass quality of the sound-emitting device.

[0057] In a specific embodiment, the first sound hole 131 and the second sound hole 132 are located on the same side of the housing 10. This ensures the coupling effect of the first sound signal and the second sound signal, thereby improving the privacy effect of the sound-generating device.

[0058] In a specific embodiment, the ratio of the volume of the second cavity corresponding to the first flexible member 31 to the volume of the rear cavity is greater than 0.5. This can improve the space utilization of the shell assembly 13 of the acoustic device 100, thereby facilitating the miniaturization design of the acoustic device 100.

[0059] In a specific embodiment, the shell 10 includes a first shell 11 having a mounting hole 111 and a second shell 12 that forms a receiving space with the first shell 11, the sound unit 20 is disposed in the receiving space, the first flexible member 31 is covered at the mounting hole 111, the first shell 11, the first flexible member 31 and the shell assembly 13 are combined to form a second cavity, and the second flexible member 32 is disposed between the first shell 11 and the second shell 12.

[0060] Specifically, the first shell 11, the second shell 12 and the sound unit 20 together form a sound-emitting device, wherein the sound unit 20 is arranged in a receiving space surrounded by the first shell 11 and the second shell 12, and can divide the receiving space into a front cavity 10a and a rear cavity, and because the first shell 11 is provided with a mounting hole 111, the rear cavity is expanded outward to the shell assembly 13.

[0061] The shape of the mounting hole 111 can be circular, rectangular, square, elliptical, diamond or irregularly circular, preferably, the shape of the mounting hole 111 is rectangular. The mounting hole 111 is a stepped hole, and the diameter of the end of the stepped hole away from the shell component 13 is larger than the diameter of the end adjacent to the shell component 13. The outer periphery of the flexible member 30 is connected to the end of the stepped hole away from the shell component 13 by bonding or welding, so that the first shell 11, the first flexible member 31 and the shell component 13 together enclose a second cavity.

[0062] In a specific embodiment, the second shell 12 has a first installation position, the sound unit 20 is installed at the first installation position, and together with the first shell 11, the second shell 12 and the plurality of flexible members 30, forms a first cavity 10b.

[0063] Specifically, a first sound outlet channel is provided in the second shell 12, and the first sound outlet channel penetrates from the inner surface of the second shell 12 to the outer surface, so as to form a first mounting position on the inner surface of the second shell 12 and a first sound outlet hole 121 on the outer surface of the second shell 12, and the first sound outlet hole 121 is communicated with a first sound hole 131 provided in the shell assembly 13. The sound unit 20 is installed at the first mounting position on the inner surface of the second shell 12, and the front side of the diaphragm is communicated with the first sound outlet channel, so that the vibration system of the sound unit 20 is divided into a front cavity 10a facing one side, and the front cavity 10a is communicated with the first sound outlet channel, the first sound outlet hole 121 and the first sound hole 131.

[0064] In a specific embodiment, a second installation position is further provided on the second shell 12 , and the second flexible member 32 is installed at the second installation position, so that a second cavity is formed between the second flexible member 32 and the second shell 12 .

[0065] Specifically, the second installation position is arranged side by side with the first installation position. Preferably, the first installation position and the second installation position have comparable dimensions, so that the diaphragm of the sound unit 20 and the radiation areas of the second flexible member 32 are comparable.

[0066] In a specific embodiment, when the second sound hole 132 exists, the second sound hole 132 is connected to the corresponding second cavity through the second sound outlet channel 123. Specifically, the second sound outlet channel 123 is provided in the second shell 12, and one end of the second sound outlet channel 123 forms a second mounting position on the inner surface of the second shell 12, and the other end forms a second sound outlet hole 122 on the outer surface of the second shell 12, and the second sound outlet hole 122 is connected to the second sound hole 132 provided in the shell assembly 13.

[0067] The inner surface of the second housing 12 is provided with a first supporting step and a second supporting step, and the inner sides of the first supporting step and the second supporting step are both formed with a step surface, which forms a first mounting position and a second mounting position. The sound unit 20 is connected to the second housing 12 through the first supporting step, and cooperates with the inner side surface of the second housing 12 to form a front cavity 10a, and the second flexible member 32 is connected to the second housing 12 through the second supporting step, and cooperates with the inner side surface of the second housing 12 to form a second cavity.

[0068] The embodiment of the utility model further provides an electronic device, which includes a shell component 13 and any one of the above-mentioned acoustic devices 100. Optionally, the acoustic device 100 is accommodated in the shell component 13, and the shell component 13 is provided with a first sound hole 131 corresponding to the first sound outlet hole 121 of the acoustic device 100, and when there is a second sound outlet hole 122, the shell component 13 is also provided with a second sound hole 132 corresponding to the second sound outlet hole 122 of the acoustic device 100.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An acoustic device, It is characterized in that include: A shell, the shell having a receiving cavity, and the shell is provided with a first sound hole; A sound-generating unit, the sound-generating unit is disposed in the receiving cavity and a rear cavity is separated from the receiving cavity, and sound waves of the sound-generating unit are radiated to the outside of the shell through the first sound hole; Multiple flexible parts are arranged in the back cavity and divide the back cavity into a first cavity and multiple second cavities. At least part of the first cavity uses the sound unit as a side wall, and each of the flexible parts is located between the first cavity and one of the second cavities.

2. The acoustic device according to claim 1, It is characterized in that In the vibration direction of the diaphragm of the sound-emitting unit, projections of at least two of the flexible members at least partially overlap.

3. The acoustic device according to claim 2, It is characterized in that The two overlapping flexible members have the same size; and / or, in the vibration direction of the diaphragm of the sound-emitting unit, at least two of the flexible members are arranged opposite to each other.

4. The acoustic device according to claim 1, It is characterized in that The flexible member comprises a deformation part and a vibration plate arranged in the middle of the deformation part, and the plane where the vibration plate is located is perpendicular to or at an angle to the vibration direction of the diaphragm of the sound-emitting unit.

5. The acoustic device according to claim 1, It is characterized in that The flexible member includes a first flexible member and a second flexible member, and the housing for forming the second cavity corresponding to the first flexible member is at least partially a shell component of an electronic device.

6. The acoustic device according to claim 5, It is characterized in that The second cavity corresponding to the first flexible member is a closed cavity, and the second cavity corresponding to the second flexible member is a closed cavity; Alternatively, a second sound hole is further formed on the shell, and the sound waves of the second cavity corresponding to the second flexible member are radiated to the outside through the second sound hole, and the second cavity corresponding to the first flexible member is a closed cavity; And / or, a ratio of the volume of the second cavity corresponding to the first flexible member to the volume of the rear cavity is greater than 0.

5.

7. The acoustic device according to claim 6, It is characterized in that The first sound hole and the second sound hole are located on the same side of the housing.

8. The acoustic device according to claim 5, It is characterized in that The shell includes a first shell having a mounting hole and a second shell forming a receiving space with the first shell, the sound unit is arranged in the receiving space, the first flexible member cover is arranged at the mounting hole, the first shell, the first flexible member and the shell assembly together form a second cavity, and the second flexible member is arranged between the first shell and the second shell.

9. The acoustic device according to claim 8, It is characterized in that The second shell has a first installation position, the sound-emitting unit is installed at the first installation position, and is enclosed together with the first shell, the second shell and the plurality of flexible members to form the first cavity.

10. The acoustic device according to claim 8, It is characterized in that The second shell is further provided with a second installation position, the second flexible member is installed at the second installation position, and a second cavity is formed between the second flexible member and the second shell.

11. An electronic device, It is characterized in that The electronic device comprises a housing assembly and the acoustic device according to any one of claims 1 to 10.

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