Electronic device and sound control method thereof

Abstract

The present invention discloses an electronic device and a sound control method thereof, the electronic device comprising a housing, a sound-generating device and a piezoelectric actuator, the housing being formed with a mounting cavity and a main sound outlet hole connected to the mounting cavity; the sound-generating device being arranged in the mounting cavity to receive excitation to emit a first sound wave and to flow out from the main sound outlet hole through the mounting cavity; the piezoelectric actuator being fixedly mounted on the housing and spaced apart from the mounting cavity to receive excitation and drive the housing to vibrate and emit a second sound wave; wherein the first sound wave and the second sound wave have the same or opposite phases. The electronic device of the technical solution of the present invention can realize different working modes and can better protect the privacy of calls in the handset mode.

Description

Technical Field

[0001] The present invention relates to the field of sound generation technology, and in particular to an electronic device and a sound generation control method thereof. Background Art

[0002] When using electronic devices, content privacy has always been a concern for users, for example, the privacy of calls on mobile terminals. With the accelerated pace of life, it is often necessary to answer calls in relatively quiet public places such as elevators or offices. The structure of existing mobile terminals generally has a dynamic sound device installed in the shell. The sound emitted by the receiver can be heard by the user and the people around him clearly, which may lead to the problem of leaking the content of the call. Summary of the invention

[0003] The main purpose of the present invention is to provide an electronic device, aiming to realize different working modes of the electronic device, and in the handset mode, can better protect the privacy of calls.

[0004] To achieve the above object, the electronic device proposed by the present invention includes:

[0005] A housing, wherein the housing is formed with a mounting cavity and a main sound outlet hole communicating with the mounting cavity;

[0006] A sound-generating device, the sound-generating device being arranged in the installation cavity to receive excitation and emit a first sound wave and flow out from the main sound outlet through the installation cavity; and

[0007] A piezoelectric actuator, the piezoelectric actuator is fixedly mounted on the housing and spaced apart from the mounting cavity to receive excitation and drive the housing to vibrate and emit a second sound wave;

[0008] The first sound wave and the second sound wave have the same or opposite phases.

[0009] Optionally, the housing includes a screen, a rear housing, and a middle housing connecting the screen and the rear housing, and the sound-generating device and the piezoelectric actuator are arranged in a direction perpendicular to the screen.

[0010] Optionally, projections of the sound-generating device and the piezoelectric actuator on the bottom surface of the rear shell at least partially overlap.

[0011] Optionally, a mounting groove is provided on the surface of the middle shell facing the screen, a groove wall of the mounting groove and the screen are combined to form the mounting cavity, the sound-emitting device is fixed in the mounting groove, and the screen is provided with the main sound outlet.

[0012] Optionally, the main sound outlet is arranged at the edge of the screen close to the middle shell, and the middle shell is provided with an expansion slot at a position corresponding to the main sound outlet. The expansion slot is spaced apart from the installation slot and is connected to the installation cavity, and a secondary sound outlet is provided on the side wall of the expansion slot and is connected to the outside world.

[0013] Optionally, the main sound outlet is provided in plurality, and the plurality of main sound outlets are arranged at intervals along the edge of the screen;

[0014] And / or, a plurality of auxiliary sound outlet holes are provided, and the plurality of auxiliary sound outlet holes are arranged at intervals along the edge of the middle shell.

[0015] Optionally, the main sound outlet is close to the top of the screen, and the auxiliary sound outlet is located on the top surface of the middle shell.

[0016] Optionally, a clamping groove is provided on the surface of the middle shell facing the rear shell, the groove wall of the clamping groove and the rear shell are combined to form a clamping cavity, the piezoelectric actuator is installed in the clamping cavity, and its outer surface is in contact with the cavity wall of the clamping cavity.

[0017] Optionally, the piezoelectric actuator is attached to a surface of the rear shell facing the installation cavity.

[0018] The present invention also provides a method for controlling the sound of an electronic device, the method comprising the steps of:

[0019] determining an operating mode of the electronic device;

[0020] When the electronic device is in the handset mode, the piezoelectric actuator and the sound-generating device are respectively stimulated with opposite phases, so as to control the piezoelectric actuator to drive the shell to vibrate and emit a second sound wave with a phase opposite to that of the first sound wave emitted by the sound-generating device;

[0021] When the electronic device is in an external speaker mode, the piezoelectric actuator and the sound-generating device are respectively stimulated with the same phase to control the piezoelectric actuator to drive the shell to vibrate and emit the second sound wave to have the same phase as the first sound wave emitted by the sound-generating device.

[0022] The electronic device of the technical solution of the present invention includes a shell, a sound-generating device and a piezoelectric actuator arranged in the shell. The sound-generating device is fixed in the installation cavity, and can emit a first sound wave after receiving excitation, and flow out from the main sound outlet through the installation cavity and be received by the user. At the same time, by adding a piezoelectric actuator, a specific excitation is received at the same time, and the shell of the electronic device can be driven to vibrate to emit a second sound wave. When the second sound wave is in the same phase as the first sound wave, the external sound effect of the electronic device is improved; when the second sound wave is in the opposite phase to the first sound wave, at a relatively far position from the electronic device, the sound-generating device and the piezoelectric actuator are close to each other, so that an acoustic dipole effect can be formed, that is, the second sound wave will reduce the propagation of the first sound wave, and then achieve the function of reducing call leakage; and for the user of the electronic device, since the distance difference between the sound-generating device, the piezoelectric actuator and the user does not meet the conditions of the acoustic dipole effect, it will not affect the user's reception of call information. Moreover, the piezoelectric actuator can be made thinner than other sound-generating components. Therefore, it will not occupy too much space in the shell while achieving a better sound leakage prevention effect, which is conducive to thinning. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 A partial cross-sectional view of an embodiment of an electronic device of the present invention;

[0025] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0026] Figure 3 It is a front view of a housing and a sound-generating device in another embodiment of the electronic device of the present invention.

[0027] Description of Figure Numbers:

[0028] Label name Label name 100 Electronic devices 153 Expansion slot 10 case 155 Secondary sound hole 10a Mounting cavity 157 Card slot 11 Screen 30 Sound device 111 Main sound hole 31 Magnetic circuit system 13 Back shell 33 Vibration system 15 Shell 50 Piezoelectric Actuator 151 Mounting slot

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] The present invention provides an electronic device 100 .

[0034] Please refer to Figure 1 and Figure 2 In one embodiment of the present invention, the electronic device 100 includes a housing 10, a sound-generating device 30 and a piezoelectric actuator 50. The housing 10 is formed with a mounting cavity 10a and a main sound-generating hole 111 communicating with the mounting cavity 10a. The sound-generating device 30 is disposed in the mounting cavity 10a to receive excitation to emit a first sound wave and to flow out of the main sound-generating hole 111 through the mounting cavity 10a. The piezoelectric actuator 50 is fixedly mounted on the housing 10 and spaced apart from the mounting cavity 10a to receive excitation and drive the housing 10 to vibrate and emit a second sound wave.

[0035] The first sound wave and the second sound wave have the same or opposite phases.

[0036] In this embodiment, the electronic device 100 can be a mobile terminal, such as a mobile phone, a tablet computer, a laptop computer, or a wearable device, such as a smart watch, a VR device, etc., or other devices that are controlled by circuits and can achieve sound effects, which are not limited here.

[0037] Specifically, the electronic device 100 includes a housing 10, a sound-generating device 30, and a piezoelectric actuator 50. The housing 10 may be made of plastic or metal, which is not limited here. It can be set according to actual needs, and can provide a good installation basis and protection basis for each component, while also taking into account the aesthetic effect. Of course, the overall shape of the housing 10 can also be set according to the actual product type, such as a cuboid, a cube, etc., which is not limited here. The housing 10 is formed with an installation cavity 10a for installing the sound-generating device 30, and provides a space for the sound-generating device 30 to propagate sound waves, thereby realizing the sound-generating function. Of course, the electronic device 100 also includes a control component, which is provided with a controller and a circuit. The housing 10 is also formed with other cavities for installing the controller and the circuit, such as a circuit board, a sensor or a power supply, etc. When the piezoelectric actuator 50 and the sound device 30 are installed in the housing 10, both are electrically connected to the controller through the circuit, so that when the sound device 30 is triggered to work, a specific excitation signal can be given to the piezoelectric actuator 50 at the same time, so that it emits a sound wave with the same or opposite phase as the sound device 30. In addition, the housing 10 can also be used to assemble components for realizing other functions of the electronic device 100, such as a display function, which will not be described in detail here.

[0038] The sound-generating device 30 is arranged in the installation cavity 10a. Its type can be a moving coil sound-generating body, a moving iron sound-generating body, or another piezoelectric actuator that is the same as the piezoelectric actuator 50. It is not limited here, and its specific structure can refer to the current sound-generating component structure, as long as it can realize electroacoustic conversion. The sound-generating device 30 is arranged in the installation cavity 10a, and it is in contact with part of the cavity wall of the installation cavity 10a, and a gap for sound wave transmission is formed between it and other parts of the cavity wall. For example, a front cavity is formed between the sound-generating device 30 and part of the cavity wall of the installation cavity 10a, and the main sound outlet 111 is connected to the front cavity, so as to realize the outflow of sound waves. Here, the sound-generating device 30 receives an excitation signal from the control unit. The excitation signal is a voice signal that the electronic device 100 needs to transmit. The sound-generating device 30 can convert it into a first sound wave and emit it to be received by the user.

[0039] The piezoelectric actuator 50 is a thin sheet structure, which can be deformed after receiving the excitation signal, thereby driving the housing 10 to vibrate and make sound. The piezoelectric actuator 50 generally includes piezoelectric ceramics. The sound-generating principle utilizes the piezoelectric effect of piezoelectric ceramics and the principle of electrical energy to mechanical energy conversion. After the audio excitation signal is passed into the piezoelectric ceramics, it can be caused to produce telescopic deformation, thereby driving the housing 10 to vibrate. Therefore, the piezoelectric actuator 50 does not need a cavity to propagate vibration. Here, the piezoelectric actuator 50 is fixed at a certain position of the housing 10 so that it can drive the housing 10 to vibrate on its surface. Therefore, the piezoelectric actuator 50 can be fixed inside the housing 10, or it can be partially fixed inside the housing 10 and partially exposed outside the housing 10, or it can be all set outside the housing 10 and fully contact with the installation position of the housing 10 to ensure its installation stability, and it is spaced apart from the installation cavity 10a, thereby reducing the vibration effect of the sound-generating device 30 on the piezoelectric actuator 50. The shape of the piezoelectric actuator 50 can be a rectangular parallelepiped, a cube or a disc, which is not limited here. Here, the excitation signal given to the piezoelectric actuator 50 can make the phase of the second sound wave emitted by it opposite to the phase of the first sound wave, that is, the piezoelectric actuator 50 is required to emit sound waves in the opposite vibration direction so that the first sound wave of the sound-generating device 30 cannot be received at a position beyond a certain distance due to the acoustic dipole effect.

[0040] The electronic device 100 of the technical solution of the present invention includes a housing 10, a sound-generating device 30 and a piezoelectric actuator 50 arranged in the housing 10. The sound-generating device 30 is fixed in the mounting cavity 10a, and can emit a first sound wave after receiving excitation, and flow out from the main sound outlet 111 through the mounting cavity 10a to be received by the user. At the same time, by adding a piezoelectric actuator 50, a specific excitation is received to drive the housing 10 to vibrate and emit a second sound wave with an opposite phase or the same phase as the first sound wave. In this way, when the electronic device 100 implements the external speaker mode, the first sound wave and the second sound wave have the same phase, which can improve the sound effect of the external speaker. When the electronic device 100 implements the handset mode, at a relatively far position from the electronic device 100, the sound device 30 and the piezoelectric actuator 50 are close to each other, so that an acoustic dipole effect can be formed, that is, the second sound wave will reduce the propagation of the first sound wave, and then achieve the function of reducing call leakage; and for the user of the electronic device 100, since the distance difference between the sound device 30 and the piezoelectric actuator 50 and the user does not meet the conditions of the acoustic dipole effect, it will not affect the user's reception of call information. Moreover, the piezoelectric actuator 50 can be made thinner in thickness than other sound-generating components, so it will not occupy too much space in the housing 10 while achieving a better anti-leakage effect, which is conducive to thinness.

[0041] Please continue to refer to Figure 1 and Figure 2Optionally, 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 sound-generating device 30 and the piezoelectric actuator 50 are arranged in a direction perpendicular to the screen 11.

[0042] In this embodiment, taking the electronic device 100 as a mobile phone as an example, the housing 10 includes a screen 11, a rear housing 13 and a middle housing 15 connecting the two, and the middle housing 15 and the screen 11 and the rear housing 13 are all detachably connected, such as snaps, threads, etc., to facilitate the assembly of various components into the housing 10, and to facilitate the maintenance or replacement of the components when necessary. Of course, the connection method of the middle housing 15 and the screen 11 and the rear housing 13 can also be bonding to improve the sealing of the connection. Here, the overall shape of the housing 10 is a rectangular parallelepiped, and the screen 11, the middle housing 15 and the rear housing 13 are connected in sequence in the thickness direction. Therefore, the sound-generating device 30 and the piezoelectric actuator 50 are arranged in a direction perpendicular to the screen 11, that is, arranged in the thickness direction, so that the thin sheet structure of the piezoelectric actuator 50 can be effectively utilized, effectively reducing the space occupied in the surface direction of the housing 10, and will not increase the thickness of the housing 10, which is conducive to thinning. At the same time, the distance between the piezoelectric actuator 50 and the sound-generating device 30 can be further reduced, which can further increase the acoustic dipole effect at a long-distance position, and is more conducive to preventing the leakage of call information.

[0043] Here, the sound device 30 may be disposed close to the screen 11 , and the piezoelectric actuator 50 may be disposed close to the rear housing 13 , or the sound device 30 may be disposed close to the rear housing 13 , and the piezoelectric actuator 50 may be disposed close to the screen 11 .

[0044] Optionally, projections of the sound generating device 30 and the piezoelectric actuator 50 on the bottom surface of the rear housing 13 at least partially overlap.

[0045] In this embodiment, the projections of the sound device 30 and the piezoelectric actuator 50 on the bottom surface of the rear shell 13 at least partially overlap. Further, in order to facilitate the spatial design of the electronic device, the projections of the sound device 30 and the piezoelectric actuator 50 on the bottom surface of the rear shell 13 completely overlap, that is, the shape and size of the piezoelectric actuator 50 can be adapted to the shape and size of the sound device 30, so as to enhance the strength of the first sound wave at a long distance, further enhance the sound leakage prevention effect, and further reduce the space occupied in the lateral direction of the housing 10. Alternatively, the size of the piezoelectric actuator 50 is larger than the size of the sound device 30, and the projection of the sound device 30 on the rear shell is within the projection range of the piezoelectric actuator 50 on the rear shell, or vice versa. The present invention does not limit the size of the piezoelectric actuator 50 and the sound device 30, but the schemes described in the present invention are conducive to more reasonable use of the internal space of the electronic device 30.

[0046] Optionally, the middle shell 15 has a mounting groove on the surface facing the screen 11 , the groove wall of the mounting groove and the screen 11 enclose the mounting cavity 10a , the sound-emitting device 30 is fixed in the mounting groove, and the screen 11 has the main sound outlet 111 .

[0047] In this embodiment, the sound device 30 is arranged near the screen 11, the middle shell 15 is provided with a mounting groove, and the screen 11 is buckled on one side of the middle shell 15, so as to enclose with the groove wall of the mounting groove to form a closed mounting cavity 10a, and a main sound outlet hole 111 is opened on the cavity wall of the mounting cavity 10a, which is used to communicate with the outside world to achieve sound. Here, the main sound outlet hole 111 is opened on the screen 11, so that the main sound outlet hole 111 is located on the front side of the electronic device 100. According to the habit of using the electronic device 100, the side of the screen 11 will fit the ear side of the user. In this way, the sound waves emitted by the sound device 30 can be more directly transmitted to the user's ear, thereby improving the efficiency and accuracy of receiving call information, and can increase the volume of the user receiving call information, and ensure the call quality. Here, for the aesthetics and display function of the screen 11, the size of the main sound outlet hole 111 can be relatively small, which does not affect its appearance. And the shape of the main sound outlet hole 111 can be circular, so as to improve the smoothness of the sound.

[0048] In one embodiment, the sound-generating device 30 is a dynamic loudspeaker, which includes a magnetic circuit system 31 and a vibration system 33. Of course, a single shell can also be provided, and the magnetic circuit system 31 and the vibration system 33 are relatively installed in the single shell. The voice coil of the vibration system 33 is suspended in the magnetic gap of the magnetic circuit system 31, so that the voice coil is driven by the magnetic field to reciprocate linear motion, so as to drive the diaphragm to reciprocate and realize the transmission of sound waves. In order to improve the installation stability, the middle shell 15 is provided with an installation groove, and a buckle edge is bent inward at the edge of the groove of the installation groove. In this way, the periphery of the sound-generating device 30 can be limited by the buckle edge to prevent it from loosening or shaking, thereby ensuring its structural stability. At the same time, a convex ring is convexly provided on the surface of the screen 11 facing the middle shell 15, and the convex ring can abut the buckle edge, so that there is a gap between the sound-generating device 30 and the screen 11, forming a front cavity space of the sound-generating device 30, and a main sound outlet 111 is provided at a position close to the convex ring. Here, the shape of the sound-generating device 30 and the mounting groove can be adapted to each other, that is, when the sound-generating device 30 is installed in the mounting groove, its single body shell abuts against the groove wall of the mounting groove, and there is no corresponding rear cavity space.

[0049] Please refer to Figure 2Optionally, the main sound hole 111 is arranged at the edge of the screen 11 close to the middle shell 15, and the middle shell 15 is provided with an expansion slot 153 at a position corresponding to the main sound hole 111. The expansion slot 153 is spaced apart from the mounting slot and is connected to the mounting cavity 10a, and a secondary sound hole 155 connected to the outside is provided on the side wall of the expansion slot 153.

[0050] It is understandable that in order not to affect the display function of the screen 11, the main sound outlet 111 is set at the edge of the screen 11. In order to further improve the external speaker effect of the electronic device, an expansion slot 153 is also provided on the middle shell 15 to connect it with the accommodating cavity. At the same time, an auxiliary sound outlet 155 is provided on the groove wall of the expansion slot 153, which can further improve the sound loudness of the electronic device 100. Furthermore, when a sound device is provided at the bottom of the electronic device, the setting of the auxiliary sound outlet 155 can cooperate with the bottom sound device 30 to achieve a better stereo effect.

[0051] Specifically, the opening of the expansion slot 153 faces the screen 11 and is arranged side by side with the mounting slot, which facilitates the circulation of sound waves and improves the sound effect. The auxiliary sound outlet 155 is circular in shape, thereby improving the smoothness of sound wave propagation. Of course, the auxiliary sound outlet 155 can also be in other shapes such as square and polygon.

[0052] Optionally, the main sound outlet holes 111 are provided in plurality, and the plurality of main sound outlet holes 111 are arranged at intervals along the edge of the screen 11;

[0053] And / or, a plurality of auxiliary sound outlet holes 155 are provided, and the plurality of auxiliary sound outlet holes 155 are arranged at intervals along the edge of the middle shell 15 .

[0054] In this embodiment, in order to further improve the sound loudness of the sound device 30, a plurality of main sound holes 111 are provided, and the plurality of main sound holes 111 are arranged at intervals along the edge of the screen 11, thereby significantly improving the sound emission efficiency and sound volume of the sound waves, increasing the volume of calls, and not affecting the display function of the screen 11.

[0055] Of course, on the basis of the plurality of main sound holes 111, the auxiliary sound holes 155 can also be set to be multiple, and the plurality of auxiliary sound holes 155 are arranged at intervals along an edge of the middle shell 15, which can further improve the sound output efficiency and sound output volume of the sound waves and improve the volume of the call. Specifically, the opening size of the auxiliary sound hole 155 can be larger than the opening size of the main sound hole 111, and the appearance of the electronic device 100 is not affected on the basis of ensuring the sound output volume and sound output efficiency. The number of main sound holes 111 can be greater than the number of auxiliary sound holes 155, so as to ensure the sound output effect without affecting the appearance when its size is small.

[0056] Optionally, the main sound outlet 111 is close to the top of the screen 11 , and the auxiliary sound outlet 155 is located on the top surface of the middle shell 15 .

[0057] It is understandable that according to the usage habits of mobile phones, when in use, the top position of the mobile phone is usually close to the human ear. Therefore, the main sound outlet 111 is set at the top of the screen 11, and the sound device 30 and the piezoelectric actuator 50 are also set at the top of the shell 10, so that they can be closer to the human ear, so as to further facilitate the user's use and improve the call volume. Here, the top of the screen 11 and the top surface of the middle shell 15 are based on the normal placement state of the user when using the electronic device 100, that is, when the electronic device 100 is close to the human ear, the end away from the bottom surface in the vertical direction is the top.

[0058] Optionally, a fixing groove 157 is provided on the surface of the middle shell 15 facing the rear shell 13, and the groove wall of the fixing groove 157 and the rear shell 13 are combined to form a fixing cavity. The piezoelectric actuator 50 is installed in the fixing cavity, and its outer surface is in contact with the cavity wall of the fixing cavity.

[0059] In this embodiment, in order to reduce the space occupied inside the shell 10, a fixing groove 157 is provided on the surface of the middle shell 15 facing the rear shell 13. The rear shell 13 covers the middle shell 15 and blocks the opening of the fixing groove 157 to enclose a fixing cavity. The shape and size of the fixing groove 157 are compatible with the shape and size of the piezoelectric actuator 50, so that the outer surface of the piezoelectric actuator 50 is in contact with the cavity wall of the fixing cavity to form a stable installation structure, which can prevent the piezoelectric actuator 50 from loosening and instability, and enhance the vibration effect of driving the rear shell 13 and / or the middle shell 15, ensure the attenuation of the first sound wave, and enhance the effect of preventing sound leakage.

[0060] Of course, here, the abutment between the piezoelectric actuator 50 and the clamping cavity can be a loose fit, which can facilitate the assembly of the piezoelectric actuator 50.

[0061] It can be understood that the piezoelectric actuator 50 is attached to the surface of the rear shell 13 facing the installation cavity 10a, receives the excitation signal to generate deformation, thereby driving the rear shell 13 to vibrate and generate a second sound wave. The structure is more stable, easy to assemble and improves the appearance of the electronic device.

[0062] Please refer to Figure 3In addition, the electronic device 100 also includes another sound device 30, which is arranged at the bottom of the housing 10 and has the same structure as the sound device 30 at the top, and is used for the sound output function of the electronic device 100. At this time, the sound device 30 at the bottom receives the excitation signal of the controller and emits a third sound wave to achieve the bottom output effect. At the same time, it can cooperate with the top sound device 30 and achieve a better stereo effect through the auxiliary sound outlet 155. At this time, the piezoelectric actuator 50 can receive the same excitation signal as the top sound device 30, drive the housing to vibrate, and emit sound waves with the same phase as the sound device 30, which can then improve the sound quality and volume of the electronic device 100 when outputting sound, and enhance the listening experience. Of course, in other embodiments, the electronic device 100 may also only have a sound-emitting device 30 at the top. When the electronic device 100 is playing sound externally, sound is also emitted through the sound-emitting device 30. At this time, an excitation signal is also given to the piezoelectric actuator 50 to emit a sound wave with the same phase as the sound wave emitted externally by the sound-emitting device 30, thereby improving the external sound effect.

[0063] The present invention further provides a method for controlling the sound of an electronic device 100. The electronic device 100 is any electronic device 100 of the above-mentioned embodiment, which will not be described in detail here. The method for controlling the sound of the electronic device 100 comprises the following steps:

[0064] S1: Determine the working mode of the electronic device 100;

[0065] S2: When the electronic device 100 is in the handset mode, the piezoelectric actuator 50 and the sound-generating device 30 are respectively stimulated with opposite phases, so as to control the piezoelectric actuator 50 to drive the shell to vibrate and generate a second sound wave with a phase opposite to the first sound wave;

[0066] S3: When the electronic device 100 is in the external speaker mode, the piezoelectric actuator 50 and the sound-generating device 30 are respectively stimulated with the same phase, so as to control the piezoelectric actuator 50 to drive the shell to vibrate and emit a second sound wave with the same phase as the first sound wave.

[0067] It can be understood that the electronic device 100 has multiple working modes, for example, a lock screen mode when powered on, or an unlock mode, a web browsing mode or a call mode, and when the electronic device 100 is in a sound mode, it can be divided into a handset mode and a speaker mode. When the user uses the handset mode, he or she tends to receive more private information, which is not likely to be received by people around him or her. When the speaker mode is used, it means that the sound volume of the electronic device 100 tends to be increased.

[0068] Therefore, in this embodiment, by adding a piezoelectric actuator 50 to the electronic device 100, it is made to cooperate with the sound device 30 to achieve a better user experience. Therefore, when controlling the piezoelectric actuator 50 to vibrate and make a sound, step S1 first determines the working mode of the electronic device 100. The determination method here can detect the working mode of the electronic device 100 through a sensor. When a certain function is triggered by a user operation, it can be detected by the sensor and sent to the controller. In step S1, for example, when the user triggers the call mode, the electronic device 100 will automatically be in the handset mode. At this time, the sensor detects that the user puts the electronic device 100 against the human ear, and then an excitation signal can be given to the piezoelectric actuator 50 to make it vibrate in the opposite direction of the sound device 30, that is, to emit a second sound wave, and form an acoustic dipole effect at a long distance around the user to achieve the effect of preventing sound leakage. Alternatively, the connection of accessories such as headphones can also be detected by a sensor to determine whether the electronic device 100 is in the handset mode.

[0069] In step S3, when the user triggers the external speaker button or triggers the music playback without detecting the connection of the earphone, it can be determined that the electronic device 100 is in the external speaker mode. At this time, it is necessary to give another excitation signal to the piezoelectric actuator 50 to make it vibrate in the same direction as the sound device 30, thereby driving the shell 10 to achieve double-sided sound, thereby improving the sound loudness and sound quality of the electronic device 100 to meet usage requirements.

[0070] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An electronic device, characterized in that: The electronic device comprises: A housing, wherein the housing is formed with a mounting cavity and a main sound outlet hole communicating with the mounting cavity; A sound-generating device, the sound-generating device being arranged in the installation cavity to receive excitation and emit a first sound wave and flow out from the main sound outlet through the installation cavity; and A piezoelectric actuator, the piezoelectric actuator is fixedly mounted on the housing and spaced apart from the mounting cavity to receive excitation and drive the housing to vibrate and emit a second sound wave; Wherein, the first sound wave and the second sound wave have the same or opposite phases; The housing includes a screen, a rear housing, and a middle housing connecting the screen and the rear housing, the sound-generating device and the piezoelectric actuator are arranged in a direction perpendicular to the screen; the sound-generating device is arranged near the screen, and the screen has the main sound outlet; The surface of the middle shell facing the rear shell is provided with a clamping groove, the groove wall of the clamping groove and the rear shell are enclosed to form a clamping cavity, the piezoelectric actuator is installed in the clamping cavity, and its outer surface is in contact with the cavity wall of the clamping cavity; the piezoelectric actuator is attached to the surface of the rear shell facing the installation cavity; The middle shell has a mounting groove on its surface facing the screen, the groove wall of the mounting groove and the screen enclose the mounting cavity, and the sound-generating device is fixed in the mounting groove and abuts against the groove wall of the mounting groove.

2. The electronic device according to claim 1, wherein: The projections of the sound generating device and the piezoelectric actuator on the bottom surface of the rear housing at least partially overlap.

3. The electronic device according to claim 1, wherein: The main sound outlet is arranged at the edge of the screen close to the middle shell, and the middle shell is provided with an expansion slot at a position corresponding to the main sound outlet. The expansion slot is spaced apart from the installation slot and is connected to the installation cavity, and a secondary sound outlet connected to the outside is provided on the side wall of the expansion slot.

4. The electronic device according to claim 3, characterized in that: There are a plurality of main sound outlets, and the plurality of main sound outlets are arranged at intervals along the edge of the screen; And / or, a plurality of auxiliary sound outlet holes are provided, and the plurality of auxiliary sound outlet holes are arranged at intervals along the edge of the middle shell.

5. The electronic device according to claim 3, characterized in that: The main sound outlet is close to the top of the screen, and the auxiliary sound outlet is located on the top surface of the middle shell.

6. A sound control method for an electronic device as claimed in any one of claims 1 to 5, characterized in that: The sound control method of the electronic device comprises the steps of: determining an operating mode of the electronic device; When the electronic device is in the handset mode, the piezoelectric actuator and the sound-generating device are respectively stimulated with opposite phases, so as to control the piezoelectric actuator to drive the shell to vibrate and emit a second sound wave with a phase opposite to that of the first sound wave emitted by the sound-generating device; When the electronic device is in an external speaker mode, the piezoelectric actuator and the sound-generating device are respectively stimulated with the same phase to control the piezoelectric actuator to drive the shell to vibrate and emit the second sound wave to have the same phase as the first sound wave emitted by the sound-generating device.

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