CN217590857U - Acoustic device and mobile terminal - Google Patents

Abstract

The utility model provides an acoustic device and a mobile terminal, wherein the acoustic device comprises a shell and a first sound-generating device arranged in the shell, and a first sound hole and a second sound hole are arranged on the shell; wherein a linkage member is arranged between the housing and the first sound-emitting device; the first sound-emitting device comprises an active vibration system and a passive vibration system, the active vibration system comprises an active vibration diaphragm and a voice coil, the passive vibration system comprises a passive vibration diaphragm, the active vibration diaphragm and the passive vibration diaphragm vibrate in the same direction, a front sound cavity is formed between the active vibration diaphragm and the shell, a rear sound cavity is formed between the passive vibration diaphragm and the shell, the first sound hole is communicated with the front sound cavity, and the second sound hole is switchably communicated with the front sound cavity or the rear sound cavity through a linkage piece. Utilize above-mentioned utility model can realize the adjustment to mobile terminal sound mode through the linkage.

Description

Acoustic device and mobile terminal

Technical Field

The utility model relates to an electronic product technical field, more specifically relates to an acoustics device and mobile terminal.

Background

At present, in a mobile terminal with a stereo sound effect, sound generating devices are generally arranged at the upper end and the lower end of the terminal respectively, and a sound output path of the sound generating device at the upper end of the mobile terminal further comprises a sound output path of the sound generating device during external playing and a sound output path of a receiver mode at the top of a screen of the mobile terminal; because two play sound paths are not mutually independent, when the end user used the earphone mode to converse, can lead to partial sound signal to go out through sound generating mechanism play sound path propagation, have terminal sound leakage problem promptly, influence user's privacy demand and sound generating mechanism's whole audio.

Therefore, there is a need for a mobile terminal capable of flexibly adjusting a speaking mode according to an application requirement of a user.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present invention provides an acoustic device and a mobile terminal to solve the problems of easy sound leakage, user privacy requirement and poor sound production device overall sound effect.

The utility model provides an acoustic device, which comprises a shell and a first sound-generating device arranged in the shell, wherein the shell is provided with a first sound hole and a second sound hole; wherein a linkage member is arranged between the housing and the first sound-emitting device; the first sound-emitting device comprises an active vibration system and a passive vibration system, the active vibration system comprises an active vibration film and a voice coil for driving the active vibration film to vibrate, the passive vibration system comprises a passive vibration film, the active vibration film and the passive vibration film vibrate in the same direction, a front sound cavity is formed between the active vibration film and the shell, a rear sound cavity is formed between the passive vibration film and the shell, the first sound hole is communicated with the front sound cavity, and the second sound hole is switchably communicated with the front sound cavity or the rear sound cavity through the linkage piece.

On the other hand, the utility model also provides a mobile terminal, including terminal housing and the above-mentioned acoustic device, the acoustic device locates the top of mobile terminal, is equipped with the first sound-emitting portion that communicates with first sound hole on the terminal housing, and the second sound-emitting portion that communicates with second sound hole; the mobile terminal is provided with a receiver mode and an external mode, and when the mobile terminal is in the receiver mode, the second sound hole is communicated with the rear sound cavity; when the mobile terminal is in the play-out mode, the second sound hole is communicated with the front sound cavity.

In the acoustic device in this embodiment, the housing of the acoustic device is provided with the first sound hole and the second sound hole, the first sound hole is in communication with the front sound cavity, and the second sound hole is in switchable communication with the front sound cavity or the rear sound cavity through the linkage, so that the first sound emitting device can be switched between the receiver mode and the speaker mode. When the second sound hole is communicated with the rear sound cavity, the first sound-emitting device realizes a receiver mode, and the first sound hole and the second sound hole radiate sound waves with opposite phases to form a sound dipole. People around the user play a role in reducing sound leakage; when the second sound hole is communicated with the front sound cavity, the first sound-emitting device realizes a loudspeaker mode, and the second sound hole and the first sound hole radiate sound waves of the front sound cavity together.

Drawings

Other objects and results of the invention will be more apparent and readily appreciated by reference to the following description taken in conjunction with the accompanying drawings, and as the invention is more fully understood. In the drawings:

fig. 1 is an exploded view of an acoustic device according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of an acoustic device according to an embodiment of the present invention;

fig. 3 is a partial cross-sectional view of an acoustic device according to a first embodiment of the present invention;

fig. 4 is a partial cross-sectional view of an acoustic device according to a second embodiment of the present invention;

fig. 5 is a partial cross-sectional view of an acoustic device according to a third embodiment of the present invention;

fig. 6 is a schematic structural view of a linkage member according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention.

Wherein the reference numerals include: the sound generating device comprises a first sound generating device 1, a magnetic circuit system 11, an active vibrating diaphragm 12, a front cover 121, a passive vibrating diaphragm 13, a voice coil 14, a rear cover 131, a first sound hole 21, a second sound hole 22, a screen assembly 3, a swing vane 4, a rear sound cavity 5, a front sound cavity 6, an arc-shaped swing groove 7, a shell 8, a first shell 81, a second shell 82, a second sound generating device 9, a framework 10, a voice coil 20, a driving motor 30 and a speed reducer 50.

The same reference numbers in all figures indicate similar or corresponding features or functions.

Detailed Description

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

For the detailed description of the structure of the acoustic device and the mobile terminal of the present invention, the following detailed description will be made on the specific embodiments of the present invention with reference to the accompanying drawings.

Fig. 1 and 2 show a wholly and partially schematic structure of an acoustic device according to the present invention, respectively; fig. 3 shows a schematic partial cross-sectional structure of a mobile terminal according to a first embodiment of the present invention.

As shown in fig. 1 to 3, in the first embodiment of the present invention, the acoustic device includes a housing 8 and a first sound generating device 1 disposed in the housing 8, and a linkage is disposed between the housing 8 and the first sound generating device 1; the first sound-generating device 1 comprises an active vibration system and a passive vibration system, the active vibration system comprises an active vibrating diaphragm 12 and a voice coil for driving the active vibrating diaphragm 12 to vibrate, the passive vibration system comprises a passive vibrating diaphragm 13, the active vibrating diaphragm 12 and the passive vibrating diaphragm 13 vibrate in the same direction, a front sound cavity is formed between the active vibrating diaphragm 12 and the shell 8, a rear sound cavity is formed between the passive vibrating diaphragm 13 and the shell 8, the first sound hole 12 is communicated with the front sound cavity, and the second sound hole 13 is communicated with the front sound cavity or the rear sound cavity in a switchable manner through the linkage piece.

Specifically, the linkage element is configured to swing in a first preset direction (right direction shown in fig. 2), so that the cavity on one side of the passive diaphragm 13 is communicated with the second sound hole 22, the cavity on one side of the active diaphragm 12 is communicated with the first sound hole 21, the second sound hole 22 is isolated from the first sound hole 21, the first sound hole 21 and the second sound hole 22 radiate sound waves with opposite phases, at this time, the mobile terminal is in a receiver mode, and the sound of the first sound emitting device 1 is transmitted only through the first sound hole 21, which can effectively prevent the leakage of sound signals; and the linkage piece is further configured to swing in a second preset direction (swing leftward with respect to the position shown in fig. 2) so as to seal the cavity located on one side of the passive diaphragm 13, the second sound hole 22 is communicated with the first sound hole 21, at this time, the mobile terminal is in a speaker mode, and a sound signal can simultaneously transmit sound through the second sound hole 22 and the first sound hole 21, so as to cooperate with the second sound generating device 9 at the bottom to achieve a stereo effect.

In other words, the linkage is configured to swing in a first preset direction, so that the second sound hole 22 and the rear sound cavity are communicated, the first sound hole 21 is isolated from the second sound hole 22, and the first sound hole 21 and the second sound hole 22 radiate sound waves with opposite phases; the linkage is further configured to swing in a second predetermined direction, so that the second sound hole 22 is isolated from the rear sound cavity, and the second sound hole 22 is communicated with the front sound cavity.

Therefore, the swing switching in different directions is performed between the first preset direction and the second preset direction through the linkage piece, so that the switching of the mobile terminal in a receiver mode and a loudspeaker mode can be realized, and further the acoustic requirements of a user in different scenes are met.

In a specific embodiment of the present invention, fig. 6 shows a schematic structure of a linkage according to an embodiment of the present invention, the linkage includes a driving motor 30, a rotating shaft connected to the driving motor 30 through a reducer 50, and a swing blade 4 provided on the rotating shaft; the driving motor 30 is configured to drive the rotating shaft to rotate through the speed reducer 50, and drive the swing blade 4 to swing along a first preset direction or a second preset direction through the rotating shaft, so as to implement flexible switching between a receiver mode and a speaker mode.

It should be noted that, when the mobile terminal is in the receiver mode, the swing leaf 4 is located at a position that isolates the first sound hole 21 from the second sound hole 22, the second sound hole 22 and the first sound hole 21 at this time form a dipole effect, the rear sound cavity 5 is conducted with the outside through the path a, the far field sound leakage at the back of the mobile terminal is reduced, and the sound leakage amount is reduced, while the first sound hole 21 is close to the ear of a person, the front sound cavity 6 is conducted with the outside through the path B, the loudness of the sound is not affected, so that the clear conversation sound is realized, and the effect of the leakage of the conversation content is prevented.

When the mobile terminal is in a loudspeaker mode, the swing blade 4 is located at a position communicated with the first sound hole 21 and the second sound hole 22, sound emitted by the first sound emitting device 1 is transmitted out through the first sound hole 21 and the second sound hole 22, namely, the paths A and B are simultaneously communicated with the front sound cavity 6, the rear sound cavity 5 is sealed, the effect of outputting a larger sound pressure level can be achieved, and then the swing blade is matched with the second sound emitting device 8, so that a high-quality stereo effect is achieved.

The passive diaphragm 13 may be a flexible film, may be disposed on an inner side wall of the housing 8, and is located in the rear acoustic cavity 5 of the first acoustic device 1, so as to have a function of preventing water from entering the rear acoustic cavity 5; in addition, the vibration of the active diaphragm 12 also drives the passive diaphragm 13 to vibrate to a certain extent, and then outputs sound waves with opposite phases, so that the second sound hole 22 and the first sound hole 21 form a dipole effect, and the work function of eliminating far-field sound leakage on the back surface of the pointing machine of the mobile terminal is achieved.

In a specific embodiment of the present invention, the first sound-emitting device 1 further includes a housing, a front cover 121 and a rear cover 131 (the rear cover structure may not be provided in the first embodiment) adapted to the housing, and a magnetic circuit 11 disposed in the accommodating space formed by the housing 8, the rear cover 131 and the front cover 121, the magnetic circuit 11 is disposed between the active diaphragm 12 and the passive diaphragm 13, the magnetic circuit 11 is formed with a magnetic gap for accommodating the voice coil, and a through hole penetrating through the magnetic circuit 11 is disposed on the magnetic circuit 11, a rear sound cavity 5 is formed between the rear cover and the passive diaphragm 13, and a front sound cavity 6 communicated with the first sound hole is formed between the front cover 121 and the active diaphragm 12; meanwhile, corresponding dust screens can be further arranged on the front cover 121 and the rear cover 131, the linkage member is arranged at the junction of the front sound cavity 6 and the rear sound cavity 5, the active vibration diaphragm 12 and the passive vibration diaphragm 13 are arranged on two sides of the magnetic circuit system 11 in parallel, the active vibration diaphragm 12 is positioned in the front sound cavity 6 of the first sound-emitting device 1, and the passive vibration diaphragm is positioned in the rear sound cavity 5 of the first sound-emitting device 1.

In the first embodiment, the passive diaphragm 13 is fixed on the inner side of the casing 8 and/or the outer side of the casing, and the passive diaphragm 13 and the first sound-emitting device 1 belong to two separate structural members, which means that other deformation forms exist for the fixing manner of the passive diaphragm 13.

Fig. 4 shows a schematic structure of a partial cross section of a mobile terminal according to a second embodiment of the present invention.

As shown in fig. 4, in the second embodiment, the passive diaphragm 13 is located in the magnetic circuit system 11, the active diaphragm 12 and the passive diaphragm 13 are symmetrically distributed with respect to the magnetic circuit system 11, a skeleton 10 penetrating through the magnetic circuit system 11 is disposed at a central position of the magnetic circuit system 11, that is, a through hole penetrates through the central position of the magnetic circuit system 11, the skeleton 10 is disposed in the through hole, and the active diaphragm 12 and the passive diaphragm 13 are connected and fixed by the skeleton 10. Alternatively, the central region of the active diaphragm 12 and/or the passive diaphragm 13 extends into the through-hole and is fixedly connected to the opposite side.

In addition, be provided with the voice coil 14 of hanging in magnetic circuit 11 at one side of initiative vibrating diaphragm 12, voice coil 14 hangs in magnetic circuit 11's magnetic gap, produces the sound signal through circular telegram vibration, because initiative vibrating diaphragm 12 and passive vibrating diaphragm 13 are connected through skeleton 10, the vibration of initiative vibrating diaphragm 12 can drive passive vibrating diaphragm 13 vibration to the sound wave of output opposite phase place, make second sound hole 22 and first sound hole 21 form the dipole effect.

In addition, fig. 5 shows a schematic partial cross-sectional structure of a mobile terminal according to a third embodiment of the present invention.

As shown in fig. 5, in the third embodiment of the present invention, the passive diaphragm 13 is also located in the magnetic circuit system, and the active diaphragm 12 and the passive diaphragm 13 are symmetrically distributed about the magnetic circuit system, and the voice coil 20 running through the magnetic circuit system is provided in the magnetic circuit system, and the active diaphragm 12 and the passive diaphragm 13 are connected and fixed through the voice coil 20.

Wherein, magnetic circuit 11 corresponds the position in magnetic gap is located to the through-hole, and voice coil 20 runs through magnetic circuit 11 and initiative vibrating diaphragm 12 and passive vibrating diaphragm 13 and passes through voice coil 20 fixed connection, perhaps sets up the skeleton and passes the through-hole, and initiative vibrating diaphragm or voice coil loudspeaker voice coil bottom are connected to the one end of skeleton, and passive vibrating diaphragm is connected to the other end.

It can be known that, by adopting the structure that the voice coil 20 fixes the active diaphragm 12 and the passive diaphragm 13, compared with the second embodiment, the installation of the bobbin can be simplified, and the magnetic field acting force of the voice coil 20 in the magnetic circuit system is stronger, and accordingly, the acoustic performance is more excellent.

It should be noted that, in the second and third embodiments, the through hole may be disposed at a corner or a side portion of the magnetic circuit system, the frame is disposed to penetrate through the through hole, and two ends of the frame are connected to the active vibrating diaphragm and the passive vibrating diaphragm respectively, for the structure and the working principle of the linkage member, the structures of the front cover 121 and the rear cover 131, and the like, reference may be made to the description in the first embodiment, and in addition, the structure of the corresponding magnetic circuit system may also be flexibly adjusted according to the fixing manner or the position relationship between the passive vibrating diaphragm and the active vibrating diaphragm, which is not described in detail herein.

In the above embodiments, the skeleton and the active diaphragm may be integrally formed, or the skeleton and the passive diaphragm may be integrally formed.

In the above embodiments, the linkage member may be disposed on the inner sidewall of the housing 8 of the mobile terminal, and may also be disposed on the outer sidewall of the casing of the first sound emitting device 1, and when the linkage member is disposed on the casing of the first sound emitting device 1, the linkage member and the first sound emitting device 1 may be installed into the housing 8 of the mobile terminal as an integral structure, thereby simplifying the assembly process.

Wherein, when the linkage piece sets up on the lateral wall of the shell of first sound-emitting device 1, can also set up the spacing groove on the shell and be located the axle slot at spacing groove both ends, the both ends of pivot can block respectively and establish in the axle slot to spacing at the spacing inslot rotation, can prevent that the pivot from rotating the in-process and appearing the skew, ensure the wobbling accuracy of pendulum leaf 4.

Further, in order to ensure that the swing blade 4 can effectively isolate or conduct the second sound hole 22 and the first sound hole 21, an arc-shaped swing groove 7 can be further arranged at a position, corresponding to the second sound hole 22, of the inner side wall of the shell 8, and the free end of the swing blade 4 is limited to swing in the arc-shaped swing groove 7; in addition, the size of the arc-shaped swing groove 7 is larger than that of the second sound hole 22; moreover, the second sound hole 22 is located at the center of the arc-shaped swing slot 7, and sound output control of the second sound hole 22 is further realized through the swing blade 4.

In a specific embodiment of the present invention, in order to reduce the influence of the vibration of the driving motor 30 on the mobile terminal, a damping bracket (not shown in the figure) can be further disposed on the outer wall of the housing or the inner wall of the housing 8 according to the setting position of the linkage, the driving motor 30 is fixed on one side of the rotating shaft 5 through the damping bracket, and the driving motor 30 is fixed through the damping bracket and the vibration interference thereof is reduced.

In order to improve the overall structural strength of the swing blade 4 and the rotating shaft 5, the rotating shaft 5 and the swing blade 4 can be arranged into an integrally formed structure; in addition, still can set up elastic sealing element at the free end that pivot 5 was kept away from to pendulum leaf 4, this elastic sealing element can select for use flexible materials such as silica gel, ensures the effect of separating of pendulum leaf 4 to reduce the friction between pendulum leaf 4 and the casing 8, not only can realize the effective shutoff to the sound channel, can also guarantee the life of mobile terminal inner structure spare.

The utility model discloses an acoustics device, still including setting up screen pack 3 on casing 8, form the passageway of making a sound that switches on mutually with first vocal hole 21 between screen pack 3 and the first sound generating device 1, this passageway of making a sound is the passageway that sets up the direction extension along screen pack 3.

In the acoustic device of the present invention, the housing 8 may further include a first housing 81 and a second housing 82 that are connected in an adaptive manner, and the structure of the housing 8 may be flexibly set for different application scenarios, and the acoustic device may be understood as a speaker module in a conventional sense, which itself forms a front acoustic cavity and a rear acoustic cavity, and is installed in the mobile terminal as a whole; in addition, the acoustic device can be matched with a shell of the mobile terminal, namely, at least one part of the shell 8 of the acoustic device can adopt a terminal shell of the mobile terminal, namely, the structure of the terminal shell is used as a part of the shell of the acoustic device, and the acoustic device and the shell of the mobile terminal are assembled to form a front acoustic cavity and/or a rear acoustic cavity, so that the space occupied by the whole acoustic device is saved.

Specifically, the housing 8 may include a front surface, a back surface, and a side surface connecting the front surface and the back surface, the screen assembly may be disposed on the front surface, the first sound hole may be disposed on the front surface of the housing or at a junction of the front surface and the side surface, and the second sound hole may be disposed on the back surface, the side surface, or at a junction of the back surface and the side surface.

The invention also provides a mobile terminal corresponding to the acoustic device, and particularly, fig. 7 shows a schematic structure of the mobile terminal according to the embodiment of the invention.

As shown in fig. 7, the mobile terminal includes a terminal housing 8 and the acoustic device, the acoustic device is disposed on the top of the mobile terminal to form a first sound generating device 1, and a first sound emitting portion communicated with the first sound hole and a second sound emitting portion communicated with the second sound hole are disposed on the terminal housing; the mobile terminal is provided with a receiver mode and a play-out mode, and when the mobile terminal is in the receiver mode, the linkage piece swings along a first preset direction; when the mobile terminal is in the outward-playing mode, the linkage piece swings along a second preset direction.

In addition, the bottom of the mobile terminal can be further provided with a second sound generating device 9, and the terminal shell is further provided with a bottom sound emitting part for transmitting sound waves of the second sound generating device 9 to the outside.

According to the above embodiment, the utility model provides an acoustic device is provided with first sound hole and second sound hole on the casing, and first sound hole switches on with preceding sound chamber, and the second sound hole switches on with preceding sound chamber or switches on with back sound chamber through the linkage switchably, can realize the conversion of first sound production spare in receiver mode and speaker mode from this. When the second sound hole is communicated with the rear sound cavity, the first sound-emitting device realizes a receiver mode, and the first sound hole and the second sound hole radiate sound waves with opposite phases to form a sound dipole. People around the user play a role in reducing sound leakage and protecting personal privacy; when the second sound hole is communicated with the front sound cavity, the first sound-emitting device realizes a loudspeaker mode, and the second sound hole and the first sound hole jointly radiate sound waves of the front sound cavity; the mobile terminal is simple in overall structure, convenient to assemble and remarkable in tone quality experience effect of a user; in addition, still be provided with passive vibrating diaphragm, not only can realize that the back sound chamber is waterproof, can also reach the dipole effect in second sound hole and first sound hole, improve mobile terminal's wholeness ability.

The acoustic device and the mobile terminal according to the present invention are described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the acoustic device and the mobile terminal provided in the present invention without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the content of the appended claims.

Claims (16)

1. An acoustic device is characterized by comprising a shell and a first sound generating device arranged in the shell, wherein a first sound hole and a second sound hole are formed in the shell; wherein,

a linkage is arranged between the housing and the first sound-emitting device;

the first sound-emitting device comprises an active vibration system and a passive vibration system, the active vibration system comprises an active vibrating diaphragm and a drive voice coil for vibrating the active vibrating diaphragm, the passive vibration system comprises a passive vibrating diaphragm, the active vibrating diaphragm vibrates in the same direction as the passive vibrating diaphragm, a front sound cavity is formed between the shells, a rear sound cavity is formed between the passive vibrating diaphragm and the shells, a first sound hole is communicated with the front sound cavity, and a second sound hole is communicated with the front sound cavity or the rear sound cavity in a switchable manner through the linkage piece.

2. The acoustic apparatus of claim 1, wherein the linkage is configured to oscillate in a first predetermined direction to bring the second acoustic aperture and the rear acoustic cavity into conduction, and the first acoustic aperture and the second acoustic aperture are isolated, and the first acoustic aperture and the second acoustic aperture radiate sound waves of opposite phases;

the linkage piece is also used for swinging along a second preset direction so as to enable the second sound hole to be isolated from the rear sound cavity, and the second sound hole is communicated with the front sound cavity.

3. The acoustic apparatus according to claim 1, wherein the first sound-emitting device further comprises a magnetic circuit system provided between the active diaphragm and the passive diaphragm, the magnetic circuit system being formed with a magnetic gap accommodating the voice coil, and the magnetic circuit system being provided with a through hole penetrating the magnetic circuit system.

4. The acoustic apparatus of claim 3,

the through hole penetrates through the center of the magnetic circuit system, a framework is arranged in the through hole, and the active vibrating diaphragm and the passive vibrating diaphragm are connected through the framework; or

The central area of the active diaphragm and/or the passive diaphragm extends into the through hole and is fixedly connected with the opposite side.

5. The acoustic device of claim 3,

the through hole is arranged at the position of the magnetic circuit system corresponding to the magnetic gap, the voice coil penetrates through the magnetic circuit system, and the active vibrating diaphragm and the passive vibrating diaphragm are fixedly connected through the voice coil, or

The framework is arranged to penetrate through the through hole, one end of the framework is connected with the active vibrating diaphragm or the bottom of the voice coil, and the other end of the framework is connected with the passive vibrating diaphragm.

6. The acoustic device according to claim 3, wherein the through-hole is provided at a corner portion or a side portion of the magnetic circuit, and a skeleton is provided to pass through the through-hole and to connect the active diaphragm and the passive diaphragm at both ends thereof, respectively.

7. The acoustic device of any of claims 4 to 6, wherein the skeleton is integrally formed with the active diaphragm or the skeleton is integrally formed with the passive diaphragm.

8. The acoustic apparatus of claim 1,

the linkage piece is arranged on the outer side wall of the shell of the first sound-emitting device, or the linkage piece is arranged on the inner side wall of the shell.

9. The acoustic device of claim 2,

the linkage part comprises a driving motor, a rotating shaft connected with the driving motor and a swinging blade arranged on the rotating shaft; wherein,

the driving motor is used for driving the rotating shaft to rotate and driving the swing blade to swing along the first preset direction or the second preset direction through the rotating shaft.

10. The acoustic apparatus of claim 9,

the driving motor is arranged on the inner side wall of the shell, the inner side wall of the shell corresponds to the position of the second sound hole and is provided with an arc-shaped swing groove, the fixed end of the swing blade is connected to the rotating shaft, and the free end of the swing blade is limited to swing in the arc-shaped swing groove.

11. The acoustic device of claim 10,

the size of the arc-shaped swinging groove is larger than that of the second sound hole; and,

the second sound hole is located at the center of the arc-shaped swinging groove.

12. The acoustic device of claim 1, wherein at least a portion of the housing is a terminal housing of a mobile terminal.

13. The acoustic device according to claim 1 or 12,

a screen assembly of the mobile terminal is further arranged on the shell; and a sound outlet channel communicated with the first sound hole and the front sound cavity is formed between the screen assembly and the first sound generating device.

14. The acoustic apparatus of claim 13, wherein the housing has a front side, a back side, and a side surface connecting the front side and the back side, the front side having the screen assembly disposed thereon, the first sound hole being disposed at the front side of the housing or at a junction of the front side and the side surface, the second sound hole being disposed at the back side, the side surface, or a junction of the back side and the side surface.

15. A mobile terminal, comprising a terminal housing and an acoustic device according to any one of claims 1 to 14, wherein the acoustic device is disposed on a top portion of the mobile terminal, and the terminal housing is provided with a first sound emitting portion communicated with the first sound hole and a second sound emitting portion communicated with the second sound hole; wherein,

the mobile terminal is provided with an earphone mode and a play-out mode, and when the mobile terminal is in the earphone mode, the second sound hole is communicated with the rear sound cavity; when the mobile terminal is in a play mode, the second sound hole is communicated with the front sound cavity.

16. The mobile terminal according to claim 15, wherein a second sound generating device is disposed on the bottom of the mobile terminal, and a bottom sound emitting portion for transmitting sound waves of the second sound generating device to the outside is further disposed on the terminal housing.

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