CN114866632A

CN114866632A - Electronic equipment and sound production control method thereof

Info

Publication number: CN114866632A
Application number: CN202210529624.7A
Authority: CN
Inventors: 蔡晓东; 刘松
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2022-08-05

Abstract

The invention discloses an electronic device and a sound production control method thereof, wherein the electronic device comprises a shell and two piezoelectric actuators, the shell comprises a screen, a rear shell and a middle shell for connecting the screen and the rear shell, the screen and the middle shell are enclosed to form a closed first fixed cavity, and the rear shell and the middle shell are enclosed to form a closed second fixed cavity; the two piezoelectric actuators are respectively arranged in the first fixed cavity and the second fixed cavity, and one piezoelectric actuator receives excitation to drive the screen to vibrate and emit first sound waves; the other piezoelectric actuator receives excitation to drive the rear shell to vibrate and emit a second sound wave, and the phase of the first sound wave is opposite to that of the second sound wave. The electronic equipment of the technical scheme of the invention can effectively solve the problem of sound leakage in the call.

Description

Electronic equipment and sound production control method thereof

Technical Field

The invention relates to the technical field of sound production, in particular to electronic equipment and a sound production control method thereof.

Background

When the electronic equipment is used, the content privacy is always a concern of users, for example, the call privacy of the mobile terminal. And with the acceleration of life rhythm, often can meet the condition of answering a call in comparatively quiet public places such as elevator or office, and the structure of current mobile terminal generally installs a moving coil formula sound production monomer in the casing, and the sound that the earphone sent can be heard by the user also can be clearly heard by people around to can have the problem of revealing the conversation content.

Disclosure of Invention

The invention mainly aims to provide electronic equipment and aims to solve the problem of call leakage of the electronic equipment.

To achieve the above object, the present invention provides an electronic device comprising:

the screen and the middle shell are enclosed to form a closed first fixed cavity, and the rear shell and the middle shell are enclosed to form a closed second fixed cavity; and

the two piezoelectric actuators are respectively arranged in the first fixed cavity and the second fixed cavity, and one piezoelectric actuator receives excitation to drive the screen to vibrate and emit first sound waves; the other piezoelectric actuator receives excitation to drive the rear shell to vibrate and emit a second sound wave, and the phase of the first sound wave is opposite to that of the second sound wave.

Optionally, a first fixing groove is formed in the surface, facing the screen, of the middle shell, and the screen covers the first fixing groove and encloses the first fixing groove to form the first fixing cavity; a second fixing groove is formed in the surface, facing the rear shell, of the middle shell, and the rear shell covers the second fixing groove and encloses the second fixing groove to form a second fixing cavity;

the two fixed parts of the two piezoelectric actuators are respectively fixed in the first fixing groove and the second fixing groove, and the two deformation parts of the two piezoelectric actuators respectively face the screen and the rear shell.

Optionally, the deformation part of one piezoelectric actuator is spaced from the screen, and the deformation part of the other piezoelectric actuator is spaced from the rear housing.

Optionally, the piezoelectric actuator is connected to the middle shell by bonding.

Optionally, the projections of the two piezoelectric actuators on the middle shell are at least partially coincident.

Optionally, both of the piezoelectric actuators are disposed near an upper end of the screen.

Alternatively, both the piezoelectric actuators are disposed at a middle portion of the screen in the width direction.

Optionally, the electronic device further includes a controller, and the controller is disposed in the housing and electrically connected to both of the piezoelectric actuators to transmit the excitation signal.

Optionally, the electronic device is a mobile phone.

The invention also provides a sound production control method of the electronic equipment, which comprises the following steps:

determining an operating mode of the electronic device;

when the electronic equipment is in an earphone mode, controlling the piezoelectric actuator close to the screen to receive and excite to emit a first sound wave, and controlling the other piezoelectric actuator to emit a second sound wave with the phase opposite to that of the first sound wave;

when the electronic equipment is in a play-out mode, the piezoelectric actuator close to the screen is controlled to receive and excite to emit a first sound wave, and the other piezoelectric actuator is controlled to emit a third sound wave with the same phase as the first sound wave.

The electronic equipment comprises a shell and two piezoelectric actuators arranged in the shell, wherein one piezoelectric actuator is close to the screen side and is arranged in a first fixed cavity, and the piezoelectric actuator can receive an excitation signal and then send out a first sound wave in the conversation process and is received by a user by driving the screen to vibrate. Meanwhile, the other piezoelectric actuator receives specific excitation at the same time in the conversation process, so that the other piezoelectric actuator emits a second sound wave with the phase opposite to that of the first sound wave and drives the rear shell to vibrate and transmit. Therefore, at a position relatively far away from the electronic device, the distance difference between the two piezoelectric actuators can be ignored, so that an acoustic dipole effect can be formed, namely the second sound wave can reduce the propagation of the first sound wave, and then the function of reducing call leakage is achieved. For a user of the electronic device, the distance difference between the two piezoelectric actuators and the ear of the user does not satisfy the condition of the acoustic dipole effect, so that the user is not affected in receiving the call information. In addition, the piezoelectric actuator can be thinner than other sound production components, so that the piezoelectric actuator does not occupy too much space of the shell under the effect of better sound leakage prevention, and the thinning is facilitated. Moreover, the piezoelectric actuator drives the screen or the rear shell to vibrate through self deformation, holes do not need to be formed in the shell, and the waterproof performance of the electronic equipment and the integrity of the marks can be improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a partial cross-sectional view of an electronic device according to an embodiment of the invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Electronic device	13	Rear shell
10	Shell body	15	Middle shell
				10a	First fixed cavity	151	First fixing groove
10b	Second fixed cavity	153	Second fixing groove
				11	Screen	30	Piezoelectric actuator

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides an electronic device 100.

Referring to fig. 1, in an embodiment of the present invention, the electronic device 100 includes a housing 10 and two piezoelectric actuators 30, where the housing 10 includes a screen 11, a rear shell 13 and a middle shell 15 connecting the screen 11 and the rear shell 13, the screen 11 and the middle shell 15 enclose to form a first sealed fixed cavity 10a, and the rear shell 13 and the middle shell 15 enclose to form a second sealed fixed cavity 10 b; the two piezoelectric actuators 30 are respectively installed in the first fixed cavity 10a and the second fixed cavity 10b, and the piezoelectric actuator 30 receives excitation to drive the screen 11 to vibrate and emit a first sound wave; the other piezoelectric actuator 30 receives the excitation to drive the rear shell 13 to vibrate and emit a second sound wave, and the phase of the first sound wave is opposite to that of the second sound wave.

In this embodiment, the electronic device 100 may be a mobile terminal, for example, a mobile phone, a tablet computer, a notebook computer, or a wearable device, for example, a smart watch, a VR device, or another device that is controlled by a circuit and can generate sound, which is not limited herein.

Specifically, the electronic device 100 includes a housing 10 and two piezoelectric actuators 30, where the material of the housing 10 may be plastic or metal, and is not limited herein, and may be set according to actual requirements, so as to provide a good installation foundation and a good protection foundation for each component, and also give consideration to an aesthetic effect. Of course, the overall shape of the housing 10 may be set according to the actual product type, such as a rectangular parallelepiped, a cube, a cylinder, etc., and is not limited herein. Specifically, taking the electronic device 100 as an example of a mobile phone, the housing 10 includes a screen 11, a rear housing 13 and a middle housing 15 connecting the screen 11 and the rear housing 13, and the middle housing 15, the screen 11 and the rear housing 13 are detachably connected, for example, by using a buckle, a thread, etc., so that each component is conveniently assembled inside the housing 10, and the component is conveniently maintained or replaced when needed. Of course, the middle case 15 and the screen 11 and the rear case 13 may be connected by bonding to improve the sealing property. In this case, the rear case 13 and the middle case 15 may be formed integrally, thereby improving the structural strength of the housing 10.

The screen 11 and the middle case 15 enclose a first fixed cavity 10a, and the rear case 13 and the middle case 15 enclose a second fixed cavity 10b, respectively for mounting the two piezoelectric actuators 30 so that they are close to the screen 11 and the rear case 13, respectively. Of course, the electronic device 100 further includes a control assembly including a controller and a circuit, and the housing 10 further forms another cavity for mounting the controller and the circuit, and when the piezoelectric actuator 30 is mounted in the housing 10, both are electrically connected with the controller through the circuit, so that the controller provides and transmits corresponding excitation signals to both. The controller may be a main control board of the electronic apparatus 100, or may be a separately provided control structure, and is electrically connected to the main control board of the electronic apparatus 100, which is not limited herein. In addition, the housing 10 may also be used to assemble components that implement other functions of the electronic device 100, such as a display component, a sensor, or a power supply, which are not described in detail herein.

The piezoelectric actuator 30 generally includes piezoelectric ceramics, and the sound generation principle utilizes the piezoelectric effect of the piezoelectric ceramics and the principle of converting electrical energy into mechanical energy, so that the piezoelectric ceramics can generate stretching vibration after the audio excitation signal is introduced into the piezoelectric ceramics, thereby driving the surrounding air and the housing 10 to generate vibration. The two piezoelectric actuators 30 may have the same structure and shape, for example, the two piezoelectric actuators 30 are both sheet-like structures, the piezoelectric actuator 30 close to the screen 11 receives an excitation signal of the controller, the excitation signal is a voice signal that needs to be transmitted by the electronic device 100, the piezoelectric actuator 30 can drive the screen 11 to vibrate and sound after receiving the excitation signal, the sound is converted into a first sound wave to be received by the user, and the sound production mode is a surface sound production mode, so that the sound production loudness and the sound quality of the electronic device 100 can be improved, and the use requirement is met. The piezoelectric actuator 30 near the rear housing 13 may drive the rear housing 13 to vibrate after receiving the excitation signal, so as to generate a second sound wave with a phase opposite to the first sound wave, so that the first sound wave near the screen 11 cannot be received at a position beyond a certain distance due to the acoustic dipole effect. Here, the two piezoelectric actuators 30 are fixed in the first fixed cavity 10a and the second fixed cavity 10b, and the sizes of the first fixed cavity 10a and the second fixed cavity 10b do not need to be large, and can be matched with the sizes of the two piezoelectric actuators 30, so that the two piezoelectric actuators can drive the housing 10 to vibrate. The first fixed chamber 10a and the second fixed chamber 10b are provided at intervals, thereby reducing the influence of vibration between the two piezoelectric actuators 30. The cross-sectional shape of the piezoelectric actuator 30 may be a rectangular parallelepiped, a square, or a disk, and is not limited thereto.

Here, the overall shape of the casing 10 is a rectangular parallelepiped, and the screen 11, the middle case 15, and the rear case 13 are sequentially connected in the thickness direction, so that the two piezoelectric actuators 30 are arranged in a direction perpendicular to the screen 11, that is, in the thickness direction, and thus the sheet structure of the piezoelectric actuators 30 can be effectively utilized, the occupation of the space in the surface direction of the casing 10 is effectively reduced, the thickness of the casing 10 is not increased, and the thinning is facilitated. Meanwhile, the distance between the two piezoelectric actuators 30 can be further reduced, the acoustic dipole effect at a remote position can be further increased, and the communication information leakage can be prevented more favorably. Here, a piezoelectric actuator 30 drives the screen 11 to vibrate and emit sound, and the vibration influence of the piezoelectric actuator 30 on the rear case 13 can be ignored. Meanwhile, another piezoelectric actuator 30 drives the rear case 13 to vibrate and generate sound, and the piezoelectric actuator 30 is ignored

The electronic device 100 according to the present invention comprises a housing 10 and two piezoelectric actuators 30 disposed in the housing 10, wherein one of the piezoelectric actuators 30 is disposed in a first fixed cavity 10a near a screen 11 side, and can emit a first sound wave after receiving an excitation signal during a call, and is received by a user by driving the screen 11 to vibrate. At the same time, the other piezoelectric actuator 30 receives a specific excitation at the same time during the conversation, so that it emits a second sound wave with a phase opposite to that of the first sound wave and drives the rear case 13 to vibrate out. In this way, at a relatively far position from the electronic device 100, the distance difference between the two piezoelectric actuators 30 is negligible, so that an acoustic dipole effect can be formed, that is, the second sound wave can reduce the propagation of the first sound wave, thereby achieving the function of reducing the call leakage. For the user of the electronic device 100, the distance difference between the two piezoelectric actuators 30 and the ears of the user does not satisfy the condition of the dipole effect, and therefore, the user does not have an influence on receiving the call information. In addition, since the piezoelectric actuator 30 can be made thinner than other sound generating components, it does not occupy too much space of the housing 10 while achieving a good sound leakage preventing effect, which is advantageous for thinning. Moreover, the piezoelectric actuator 30 drives the screen 11 or the rear housing 13 to vibrate through its own deformation, and there is no need to provide a hole in the housing 10, so that the waterproof performance and the integrity of the mark of the electronic device 100 can be improved.

With reference to fig. 1, optionally, a first fixing groove 151 is formed in a surface of the middle shell 15 facing the screen 11, and the screen 11 covers the first fixing groove 151 and encloses the first fixing cavity 10 a; a second fixing groove 153 is formed in the surface, facing the rear shell 13, of the middle shell 15, and the rear shell 13 covers the second fixing groove 153 and encloses to form the second fixing cavity 10 b;

the two fixing portions of the two piezoelectric actuators 30 are fixed in the first fixing groove 151 and the second fixing groove 153, respectively, and the deformation portions of the two piezoelectric actuators 30 face the screen 11 and the rear case 13, respectively.

In this embodiment, in order to stably fix the two piezoelectric actuators 30, a first fixing groove 151 and a second fixing groove 153 are formed on two opposite surfaces of the middle case 15, openings of the first fixing groove 151 and the second fixing groove 153 are both rectangular, the screen 11 is fastened to one surface of the middle case 15, so as to form a first closed fixing cavity 10a by being surrounded by a groove wall of the first fixing groove 151, and the rear case 13 is fastened to the other surface of the middle case 15, so as to form a second closed fixing cavity 10b by being surrounded by a groove wall of the second fixing groove 153. Correspondingly, the piezoelectric actuator 30 is also a rectangular parallelepiped sheet having a fixing portion for fixing and mounting, and a deformation portion, which may be a piezoelectric ceramic, mounted to the fixing portion. So that the fixing portion of the piezoelectric actuator 30 is connected to the bottom of the first fixing groove 151, where the connection manner may be welding, bonding, or the like, and is not limited herein. Alternatively, the piezoelectric actuator 30 and the middle shell 15 are connected by adhesion, so that the assembly is more convenient, the cost is lower, and the connection stability of the piezoelectric actuator 30 can be ensured. And the deformation parts for telescopic deformation respectively face the screen 11 and the rear shell 13, so that the piezoelectric actuator 30 conveniently realizes the function of respectively driving the screen 11 and the rear shell 13 to vibrate and sound on the basis of stable installation. The piezoelectric actuator 30 can be detachably connected to the screen 11 and the rear housing 13 through the middle housing 15, so that the piezoelectric actuator is convenient to disassemble, assemble and maintain, and convenience is improved.

It can be understood that, according to the habit of using electronic equipment 100, screen 11 can laminate in user's ear, so, piezoelectric actuator 30's deformation portion drives screen 11 vibration sound production, can directly propagate to user's ear more in, increase vocal area, improve the efficiency and the rate of accuracy of receiving conversation information to can improve the volume that user received conversation information, guarantee speech quality.

Alternatively, the deformation portion of one of the piezoelectric actuators 30 is spaced apart from the screen 11, and the deformation portion of the other of the piezoelectric actuators 30 is spaced apart from the rear case 13.

In this embodiment, the deformation portion of the piezoelectric actuator 30 is set to be spaced from both the screen 11 and the rear housing 13, that is, a part of the space in the first fixing cavity 10a can provide the deformation space of the piezoelectric actuator 30, so as to ensure the sound generating performance thereof, and the piezoelectric actuator 30 can be conveniently assembled. Of course, in other embodiments, the two deformation portions of the two piezoelectric actuators 30 may also abut against the screen 11 and the rear housing 13 to form a stable mounting structure, which can prevent the piezoelectric actuators 30 from loosening and instability, and improve the vibration effect of driving the rear housing 13 and the screen 11.

Optionally, the projections of the two piezoelectric actuators 30 on the middle shell 15 at least partially coincide.

In this embodiment, in order to further save space, at least a part of the projections of the two piezoelectric actuators 30 on the surface of the middle shell 15 are overlapped, so as to improve the force for reducing the first sound wave at a long distance, further improve the sound leakage prevention effect, and further reduce the space occupation of the shell 10 in the transverse direction. Alternatively, the two piezoelectric actuators 30 are identical in shape and size, and are arranged in a manner that the projections on the surface of the middle shell 15 are overlapped, so that the space occupation of the casing 10 in the transverse direction is further reduced, and the first sound wave on the screen 11 side is further prevented from being leaked out.

Optionally, both of the piezoelectric actuators 30 are disposed near the upper end of the screen 11.

It can be understood that, according to the usage habit of the mobile phone, when in use, the upper end of the piezoelectric actuator 30 is usually attached to the ear of a person, so that the two piezoelectric actuators are disposed near the upper end of the screen 11, and thus the piezoelectric actuator can be closer to the ear of the person, so as to further facilitate the use of the user and increase the volume of the call. Here, the top end of the screen 11 is based on a normal placement state of the user when using the electronic apparatus 100, and one end of the screen 11 away from the human hand when conforming to the viewing habit, that is, the end away from the ground in the vertical direction when the electronic apparatus 100 is attached to the human ear is an upper end.

Alternatively, both the piezoelectric actuators 30 are disposed in the middle of the screen 11 in the width direction.

In this embodiment, in order to further improve the leakage-proof function, two piezoelectric actuators 30 are disposed in the middle of the screen 11 in the width direction, that is, the projection of the piezoelectric actuator 30 close to the screen 11 on the screen 11 is the middle of the upper end of the screen 11, and the other piezoelectric actuator 30 coincides with the projection of the piezoelectric actuator 30 on the screen 11, so that the piezoelectric actuator 30 close to the rear case 13 can provide an equal offset function in the width direction relative to the electronic device 100, and it is ensured that the leakage of the call information can be avoided on both sides of the electronic device 100 in the width direction, thereby further improving the uniformity of leakage-proof at each position of the electronic device 100.

In addition, the electronic apparatus 100 is provided with the piezoelectric actuator 30 at the upper end of the screen 11, and when the electronic apparatus 100 is used for external radiation, the piezoelectric actuator 30 is also used for generating sound, and at this time, the piezoelectric actuator 30 close to the rear shell 13 is also given an excitation signal, so that sound waves with the same phase as the external radiation sound waves of the piezoelectric actuator 30 close to the rear shell 13 are generated, and the external radiation effect is improved.

Certainly, in other embodiments, the electronic device 100 further includes another sound generating component, the sound generating component is disposed at the bottom of the housing 10, that is, the other end away from the two piezoelectric actuators 30, and is used for the sound playing function of the electronic device 100, at this time, the sound generating component at the bottom receives the excitation signal of the controller and sends a fourth sound wave corresponding to the sound signal that needs to be played, and then, the piezoelectric actuator 30 close to the rear shell 13 can receive another excitation signal and send a fifth sound wave with the same phase as the fourth sound wave, so that the sound quality and volume of the electronic device 100 when playing are improved, and the hearing experience is improved.

The present invention further provides a sound emission control method of the electronic device 100, where the electronic device 100 is the electronic device 100 according to any of the above embodiments, and details are not repeated herein.

The sound production control method of the electronic device 100 comprises the following steps:

s1: determining an operating mode of the electronic device 100;

s2: when the electronic device 100 is in an earphone mode, controlling the piezoelectric actuator 30 close to the screen 11 to receive and excite a first sound wave, and controlling the other piezoelectric actuator 30 to emit a second sound wave with a phase opposite to that of the first sound wave;

s3: when the electronic device 100 is in a play-out mode, the piezoelectric actuator 30 close to the screen 11 is controlled to receive and excite to emit a first sound wave, and the other piezoelectric actuator 30 is controlled to emit a third sound wave with the same phase as the first sound wave.

It can be understood that the electronic device 100 has a plurality of operating modes, for example, a screen-locking mode in a power-on state, an unlocking mode, a web browsing mode or a call mode, and when the electronic device 100 is in a sound-producing mode, the electronic device may be further divided into an earpiece mode and a play-out mode, and when the earpiece mode is used, a user tends to receive more private information, and tends not to be received by surrounding people, and when the play-out mode is used, the sound-producing volume of the electronic device 100 tends to be increased.

In this embodiment, the electronic device 100 is additionally provided with the piezoelectric actuator 30, that is, two piezoelectric actuators 30 are provided, so that the two piezoelectric actuators are matched with each other, and a better use experience is realized. Therefore, when the sound emission of the piezoelectric actuator 30 close to the rear case 13 is controlled, in step S1, the operation mode of the electronic device 100 is determined, where the determination mode may be detected by the sensor, and when a certain function is triggered by the user operation, the operation mode may be detected by the sensor and sent to the controller, for example, when the user triggers the talk mode, the electronic device 100 automatically jumps to the earpiece mode. Or, detecting a triggering condition of the play-out module, when it is detected that the play-out module is triggered, determining as the play-out mode, and when not triggered, determining as the earpiece mode basically. Or when the sensor detects that the user fits the electronic device 100 to the ear of the user, the mode may be determined as the earphone mode; alternatively, whether or not an accessory such as an earphone is connected may be detected by a sensor, so as to determine that the electronic apparatus 100 is in the earpiece mode.

In step S2, when the earphone mode is determined, an excitation signal may be given to the piezoelectric actuator 30 close to the rear case 13 to convert and emit a second sound wave having a phase opposite to that of the piezoelectric actuator 30 on the screen 11 side, thereby forming an acoustic dipole effect at a distant position around the user to achieve a sound leakage prevention effect.

In step S3, when the user triggers the play button or the user triggers the music playing without detecting the connection of the headphones, it may be determined that the electronic device 100 is in the play mode, and at this time, another excitation signal needs to be given to the piezoelectric actuator 30 close to the rear shell 13 to make it emit a third sound wave with the same phase as the piezoelectric actuator 30 on the screen 11 side, so as to drive the rear shell 13 to generate sound, so as to improve the sound generating loudness and sound quality of the electronic device 100, and meet the use requirements.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An electronic device, characterized in that the electronic device comprises:

2. The electronic device of claim 1, wherein a surface of the middle shell facing the screen is provided with a first fixing groove, and the screen covers the first fixing groove and encloses to form the first fixing cavity; a second fixing groove is formed in the surface, facing the rear shell, of the middle shell, and the rear shell covers the second fixing groove and encloses the second fixing groove to form a second fixing cavity;

3. The electronic device of claim 2, wherein the deformer of one of the piezoelectric actuators is spaced apart from the screen and the deformer of the other of the piezoelectric actuators is spaced apart from the rear housing.

4. The electronic device of claim 2, wherein the piezoelectric actuator is attached to the middle housing by bonding.

5. The electronic device of any of claims 1-4, wherein projections of the two piezoelectric actuators on the middle shell at least partially coincide.

6. The electronic device of claim 5, wherein both of the piezoelectric actuators are disposed near an upper end of the screen.

7. The electronic device according to claim 5, wherein both of the piezoelectric actuators are disposed at a middle portion of the screen in a width direction.

8. The electronic device according to any one of claims 1 to 7, further comprising a controller disposed within the housing and electrically connected to both of the piezoelectric actuators to send an excitation signal.

9. The electronic device of claim 1, wherein the electronic device is a cell phone.

10. A sound emission control method of an electronic device according to any one of claims 1 to 9, the sound emission control method comprising the steps of:

determining an operating mode of the electronic device;