Sound production apparatus and electronic device

Abstract

The present application provides a sound production apparatus and an electronic device. The sound production apparatus comprises a first transducer and a second transducer; the first transducer comprises a first base and a first vibration assembly; the outer circumference of the first vibration assembly is fixed to the first base; the second transducer comprises a second base and a second vibration assembly; the second vibration assembly is fixed to the second base; and the second vibration assembly and the first vibration assembly are opposite to and spaced apart from each other. The middle portion of the first vibration assembly and the second transducer define a vibration space; the outer circumference of the second vibration assembly and the outer circumference of the first vibration assembly define an acoustic channel; and the vibration space is communicated with an external space through the acoustic channel. The sound production apparatus has a simple structure and a small size.

Description

Sound-generating devices and electronic devices

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on December 28, 2023, with application number: 202311850218.1, and priority to the Chinese patent application with the invention name “Sound-emitting device and electronic device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of audio technology, and in particular to a sound-generating device and an electronic device. Background Art

[0003] Speakers are widely used in many current consumer electronics products, providing consumers with audio entertainment and an enhanced audio experience. When operating at low frequencies, the diaphragm's displacement must be increased to meet the required sound pressure at these frequencies. This requires a larger vibration volume for the diaphragm, resulting in a larger speaker size. Summary of the Invention

[0004] The present application provides a sound-generating device and an electronic device.

[0005] In a first aspect, an embodiment of the present application provides a sound-generating device. The sound-generating device includes a first transducer and a second transducer. The first transducer includes a first base and a first vibration component. The outer periphery of the first vibration component is fixed to the first base. The second transducer includes a second base and a second vibration component. The second vibration component is fixed to the second base. The second vibration component and the first vibration component are arranged opposite and spaced apart. The middle portion of the first vibration component and the second transducer enclose a vibration space. The outer peripheries of the second vibration component and the first vibration component enclose an acoustic channel. The vibration space is connected to the external space through the acoustic channel.

[0006] It is understandable that the middle portion of the first vibration component can vibrate at a first frequency to form a first sound wave, and the outer periphery of the second vibration component can reciprocate so that the acoustic channel opens and closes at a second frequency. The first frequency and the second frequency are different, and the first sound wave is modulated by the acoustic channel to form the second sound wave. The sound-generating device of the present application adopts a sound-generating method different from that of traditional speakers. The first vibration structure not only forms the first sound wave, but also participates in the formation of the acoustic channel, which has the effect of "one thing for two uses". The sound-generating device does not need to set up an additional structure to form the acoustic channel, and the sound-generating device is relatively small.

[0007] In some possible implementations, the middle part of the second vibration component and the middle part of the first vibration component are arranged opposite to each other, the middle part of the second vibration component is fixed to the second base, the outer periphery of the second vibration component and the outer periphery of the first vibration component are arranged opposite to each other, and the outer periphery of the second vibration component and the outer periphery of the first vibration component enclose an acoustic channel.

[0008] It is understood that the acoustic channel enclosed by the outer periphery of the second vibrating component and the outer periphery of the first vibrating component can be annular. The acoustic channel can be arranged to surround the vibration space. This can extend the length of the acoustic channel. When the acoustic channel is controlled to open and close at the second frequency, the adjustable range of the acoustic channel is larger.

[0009] In some possible implementations, a first through hole is provided in the middle of the second vibration component, and the middle of the first vibration component and the second base are arranged opposite to each other.

[0010] It is understood that the first through hole provided in the middle of the second vibration component can, on the one hand, increase the height of the vibration space without increasing the height of the sound-generating device in the first direction, thereby reducing the risk of interference between the middle portion of the first vibration component and the second vibration component or the second base during vibration, thereby reducing the risk of malfunction of the sound-generating device. On the other hand, it can reduce the volume of the second vibration component, save materials, and reduce the cost of the sound-generating device.

[0011] In some possible implementations, the acoustic channel is annular.

[0012] It is understood that, compared to a solution where the acoustic channel is located on one side of the vibration space, the acoustic channel is arranged in a ring shape, surrounding the vibration space, which can make the acoustic channel longer. When the acoustic channel is controlled to open and close at the second frequency, the adjustable range of the acoustic channel is larger.

[0013] In some possible implementations, the first base is fixedly connected to the second base, the second vibration component is fixed to one side of the second base and spaced apart from the first base, the middle part of the first vibration component is arranged opposite to the second base, and the acoustic channel is located on one side of the vibration space.

[0014] It is understandable that when the acoustic channel can be located on one side of the vibration space, the second sound wave can be transmitted from the side where the acoustic channel is located to the external space. The sound direction of the sound-emitting device can be controlled. Moreover, when the sound-emitting device is fixed to an electronic device, the sound-emitting device can be fixedly connected to the electronic device by either the first base or the second base. Compared with the solution in which the first base and the second base are separately installed on the electronic device, the risk of misalignment of the first vibration component and the second vibration component can be reduced, the assembly accuracy of the sound-emitting device is higher, and the installation difficulty of the sound-emitting device is relatively low.

[0015] In some possible implementations, the acoustic channel is linear or arc-shaped.

[0016] It is understood that the shape of the acoustic channel can be various, so as to adjust the direction of sound emission. For example, when the acoustic channel is arc-shaped, the central angle corresponding to the arc can be adjusted, so that the coverage range of the sound emitted by the sound-emitting device can be adjusted.

[0017] In some possible implementations, there are multiple second vibration components, and the multiple second vibration components are arranged at intervals.

[0018] It is understood that when there are multiple second vibration components, the multiple second vibration components and the outer periphery of the first vibration component can enclose multiple acoustic channels. By adjusting the position of the second vibration component, the sound emission direction of the sound-emitting device can be adjusted.

[0019] In some possible implementations, the second vibration component is circular, annular, rectangular, or arc-shaped.

[0020] It is understandable that the shape of the acoustic channel can be adjusted by adjusting the shape of the second vibration component. There are many options for the shape of the second vibration component, and the generating device can be suitable for various usage scenarios.

[0021] In some possible implementations, the second vibration component is a piezoelectric piece, and the sound-generating device further includes a second feeding circuit, which is electrically connected to the second vibration component and is used to transmit an electrical signal to the second vibration component.

[0022] It can be understood that, compared with the solution of using a traditional mechanical motion structure to achieve reciprocating motion of the outer periphery of the second vibration component, the volume of the piezoelectric piece is smaller, which is conducive to reducing the volume of the sound-generating device.

[0023] In some possible implementations, the reciprocating motion is reciprocating rotation or reciprocating movement.

[0024] In some possible implementations, along a first direction, a distance between the first vibration component and the second vibration component is less than 1 mm, and the first direction is a direction from the first vibration component toward the second vibration component.

[0025] It is understandable that the distance between the first vibration component and the second vibration component is small, and the thickness of the sound-emitting device in the first direction is small, which is conducive to the miniaturization of the sound-emitting device. In addition, the vibration distance of the first vibration component is small, and the vibration amplitude of the middle part of the first vibration component during the vibration process is also small. When the sound-emitting device is installed in the internal space of the electronic device, the sound-emitting device can reduce the risk of the first vibration component causing the housing and / or keyboard of the electronic device to vibrate during the sound-emitting process, and can also reduce the airflow noise problem caused by large-amplitude vibration.

[0026] In some possible implementations, the central portion of the first vibrating component vibrates at a first frequency to generate a first sound wave, and the outer periphery of the second vibrating component reciprocates, causing the acoustic channel to open and close at a second frequency. The first and second frequencies are different, and the first sound wave is modulated by the acoustic channel to generate a second sound wave. The second sound wave includes audible sound, and the first frequency is greater than the frequency of the audible sound in the second sound wave.

[0027] It is understandable that the high-frequency first sound wave can be modulated by the acoustic channel to form an audible sound of lower frequency, and the sound pressure value of the audible sound can be equal to or close to the sound pressure value of the first sound wave. Compared with the sound pressure value of a traditional speaker emitting a sound of the same frequency as the audible sound, the sound pressure value of the sound-emitting device of the present application is higher when the audible sound frequency is the same. In other words, the low-frequency acoustic performance of the sound-emitting device of the present application is better. In addition, compared with a traditional speaker producing sound of the same sound pressure level, the vibration displacement of the first vibration structure of the sound-emitting device of the present application can be smaller than the vibration displacement of the diaphragm of a traditional speaker. This is conducive to reducing the volume of the sound-emitting device. The sound-emitting device can have a higher low-frequency sound pressure level in a small volume.

[0028] In some possible implementations, the difference between the first frequency and the resonant frequency of the first vibration component is less than or equal to a threshold. And / or the difference between the second frequency and the resonant frequency of the second vibration component is less than or equal to a threshold. The threshold is less than or equal to 500 Hz.

[0029] It is understood that setting the first frequency close to or equal to the resonant frequency of the first vibration component can improve the vibration efficiency of the sound-generating device. Setting the second frequency close to or equal to the resonant frequency of the second vibration component can also improve the vibration efficiency of the sound-generating device. Those skilled in the art can use simulation tools to design the first vibration component and the second vibration component so that the resonant frequencies of the first vibration component and the second vibration component meet preset values.

[0030] In some possible implementations, the first frequency f1 is a single frequency or a frequency band, and the second frequency f2 is a single frequency or a frequency band.

[0031] It is understandable that the frequency band of the second sound wave can be adjusted to a single frequency or a frequency band by setting the first frequency f1 and the second frequency f2 to a single frequency or a frequency band.

[0032] In some possible implementations, the frequencies of the second sound wave include |f1-f2| and |f1+f2|, and the first frequency f1 and the second frequency f2 satisfy: |f1-f2| is at least partially within a range less than or equal to 20 kHz, and 20 kHz≤|f1+f2|.

[0033] It can be understood that by setting the magnitudes of the first frequency f1 and the second frequency f2, the second sound wave includes two frequencies of sound, one of which is audible and the other of which falls within the ultrasonic frequency range. When the sound-generating device emits sound, the second sound wave's frequency within the ultrasonic range will not be received by the user, and the user will only hear an audible sound, resulting in less noise from the sound-generating device.

[0034] In some possible implementations, the first frequency f1 and the second frequency f2 further satisfy: f1 ≥ 20 kHz, f2 ≥ 20 kHz.

[0035] It can be understood that by setting the first frequency f1 and the second frequency f2 to ultrasonic frequencies, the first frequency f1 and the second frequency f2 will not be heard by the user when the sound-emitting device emits sound, and the sound-emitting device produces less noise. In addition, by setting the first frequency f1 and the second frequency f2 to ultrasonic frequencies, it can also be ensured that the sound wave of |f1+f2| in the second sound wave can fall within the frequency range of ultrasonic waves, and the sound wave of frequency |f1+f2| in space cannot be heard by the human ear. In addition, by setting the first frequency f1 and the second frequency f2 to ultrasonic frequencies, the sound-emitting device can obtain a larger sound pressure value under a smaller vibration displacement. When the frequency |f1-f2| is audible, the sound pressure value of the second sound wave is larger, and the low-frequency performance of the sound-emitting device is better.

[0036] In a second aspect, an embodiment of the present application provides an electronic device, wherein the electronic device includes a sound-generating device, so that the sound-generating device is small in size, which is conducive to miniaturization of the electronic device.

[0037] In some possible implementations, the electronic device may further include a housing, and the sound-emitting device is installed in the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0039] FIG1 is a schematic diagram of a partial structure of an electronic device provided in an embodiment of the present application;

[0040] FIG2 is an exploded schematic diagram of an embodiment of the electronic device shown in FIG1 ;

[0041] FIG3 is a partial cross-sectional view of an embodiment of the electronic device shown in FIG1 at section line AA;

[0042] FIG4 is a schematic structural diagram of an embodiment of the sound-generating device shown in FIG2 ;

[0043] FIG5 is an exploded schematic diagram of an embodiment of the sound-generating device shown in FIG4 ;

[0044] FIG6 is a partial cross-sectional view of an embodiment of the sound-generating device shown in FIG4 at section line BB;

[0045] FIG7 is a schematic structural diagram of the sound-generating device shown in FIG4 at another angle;

[0046] FIG8 is an exploded schematic diagram of another embodiment of the sound-generating device shown in FIG4 ;

[0047] FIG9 is a partial cross-sectional view of another embodiment of the sound generating device shown in FIG4 at section line BB;

[0048] FIG10 is a schematic structural diagram of another embodiment of the sound-generating device provided in an embodiment of the present application at another angle;

[0049] FIG11 is a partial cross-sectional view of an embodiment of the sound-generating device shown in FIG10 at section line CC;

[0050] FIG12a is a schematic structural diagram of another embodiment of the sound-generating device provided in an embodiment of the present application at another angle;

[0051] FIG12b is a schematic structural diagram of another embodiment of the sound-generating device provided in an embodiment of the present application at another angle;

[0052] FIG. 13 is a partial cross-sectional view of yet another embodiment of the electronic device shown in FIG. 1 taken along section line AA. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " represents or, for example, A / B can represent A or B; "and / or" in the text is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two.

[0054] In the following, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features.

[0055] The directional terms mentioned in the embodiments of the present application, such as "upper", "lower", "inside", "outside", "side", "top", "bottom", etc., are only references to the directions of the drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0056] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set on..." should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" can be a connection between each other and the relative position relationship remains unchanged after the connection. "Rotational connection" can be a connection between each other and can rotate relative to each other after the connection. "Sliding connection" can be a connection between each other and can slide relative to each other after the connection. Among them, "electrical connection" means that electrical signals can be conducted between each other.

[0057] In addition, in the embodiments of this application, the mathematical concepts mentioned, such as parallel, are limited to the current state of the art, rather than being strictly mathematically defined. A small amount of deviation is permitted, and any approximation to parallelism is acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 and 10 degrees.

[0058] Fig. 1 is a partial structural diagram of an electronic device 1 provided in an embodiment of the present application. Fig. 2 is an exploded schematic diagram of an embodiment of the electronic device 1 shown in Fig. 1 .

[0059] As shown in Figure 1, the electronic device 1 includes a sound-emitting device 100, a housing 200, and a screen 300. The electronic device 1 can be an electronic device 1 such as a mobile phone, a tablet, a hearing aid, a smart wearable device, etc. that needs to output audio through the sound-emitting device 100. The smart wearable device can be a smart watch, augmented reality (AR) glasses, an AR helmet, or virtual reality (VR) glasses, etc. The electronic device 1 can also be a device that can output audible sound, such as headphones and a player. In addition, the sound-emitting device 100 can also be used in the fields of the whole house, smart home, automobile, etc., as an audio device or a part of an audio device. The electronic device 1 of the embodiment shown in Figure 1 is explained using a mobile phone as an example.

[0060] Because the sound-generating device 100 is an internal component of the electronic device 1, FIG1 schematically illustrates the sound-generating device 100 using dashed lines. It should be understood that FIG1 and the related figures below merely schematically illustrate some of the components of the electronic device 1. The actual shape, size, position, and structure of these components are not limited by FIG1 and the figures below. Furthermore, when the electronic device 1 is a device of some other form factor, the screen 300 may not be provided.

[0061] Among them, the screen 300 is installed on the shell 200. The shell 200 and the screen 300 can constitute the outer shell of the electronic device 1. The screen 300 and the shell 200 can enclose the inner cavity of the electronic device 1. The sound-emitting device 100 can be installed in the inner cavity of the electronic device 1. The shell 200 has a sound outlet 201. The sound outlet 201 connects the inner cavity of the electronic device 1 with the external space of the electronic device 1. At this time, the sound emitted by the sound-emitting device 100 can be transmitted to the outside of the electronic device 1 through the sound outlet 201. It can be understood that the shape of the sound outlet 201 is not limited to the cylindrical hole shown in Figure 1. The shape of the sound outlet 201 can also be a special-shaped hole. The sound outlet 201 is also not limited to the five shown in Figure 1.

[0062] Exemplarily, the housing 200 may include a back cover 210 and a middle frame 220. The screen 300 and back cover 210 are respectively connected to either side of the middle frame 220. The screen 300 and the middle frame 220 may enclose a first inner cavity 2 of the electronic device 1, while the back cover 210 and the middle frame 220 may enclose a second inner cavity 3 of the electronic device 1. The internal components of the electronic device 1 may be placed in either the first inner cavity 2 or the second inner cavity 3 as required. Exemplarily, the sound-emitting device 100 may be placed in the second inner cavity 3.

[0063] Fig. 3 is a partial cross-sectional view of an embodiment of the electronic device 1 shown in Fig. 1 at section line AA. Fig. 4 is a structural diagram of an embodiment of the sound-generating device 100 shown in Fig. 2 .

[0064] As shown in Figures 3 and 4, the sound-generating device 100 may include a first transducer 10 and a second transducer 20. The first transducer 10 includes a first base 11 and a first vibration component 12, wherein the outer periphery 124 of the first vibration component 12 is fixed to the first base 11; the second transducer 20 includes a second base 21 and a second vibration component 22, wherein the second vibration component 22 is fixed to the second base 21, and the second vibration component 22 and the first vibration component 12 are arranged relative to and spaced apart from each other. It should be noted that the relative arrangement of the first vibration component 12 and the second vibration component 22 means that their projections on the reference plane along the first direction at least partially overlap, the first direction being the direction from the first vibration component 12 to the second vibration component 22, and the reference plane being perpendicular to the first direction.

[0065] The first base 11 can be used to fix the first vibration component 12. The second base 21 can be used to fix the second vibration component 22. For example, when the first sound-emitting device 100 is installed in the second inner cavity 3 of the electronic device 1, the first base 11 of the first transducer 10 can be fixedly connected to the back cover 210, and the first vibration component 12 can be fixed to the back cover 210 through the first base 11. The second base 21 of the second transducer 20 can be fixedly connected to the middle frame 220, and the second vibration component 22 can be fixed to the middle frame 220 through the second base 21. In other embodiments, the first base 11 of the first transducer 10 can also be fixedly connected to the middle frame 220, and the second base 21 of the second transducer 20 can be fixedly connected to the back cover 210.

[0066] In other embodiments, the sound-generating device 100 may also be disposed in the first inner cavity 2. For example, the first base 11 of the first transducer 10 may be fixedly connected to the screen 300, and the second base 21 of the second transducer 20 may be fixedly connected to the middle frame 220. In other embodiments, the first base 11 of the first transducer 10 may also be fixedly connected to the middle frame 220, and the second base 21 of the second transducer 20 may be fixedly connected to the screen 300.

[0067] Figure 5 is an exploded schematic diagram of an embodiment of the sound-generating device 100 shown in Figure 4 . Figure 6 is a partial cross-sectional view of an embodiment of the sound-generating device 100 shown in Figure 4 at section line BB. Figure 7 is a schematic structural diagram of the sound-generating device 100 shown in Figure 4 from another angle. For ease of understanding, the vibration space 101 and acoustic channel 102 are illustrated in dashed boxes in Figure 6 . The vibration space 101 and acoustic channel 102 are illustrated in filled patterns in Figure 7 .

[0068] As shown in Figures 5, 6, and 7, the middle portion 123 of the first vibrating assembly 12 and the second transducer 20 can enclose a vibration space 101 (the vibration space 101 is schematically illustrated by the dotted box in Figure 6). The middle portion 123 of the first vibrating assembly 12 can vibrate at a first frequency to generate a first sound wave. The frequency of the first sound wave can be equal to the first frequency.

[0069] Exemplarily, the first vibration component 12 may include a diaphragm 121 and a first vibration structure 122. The first vibration structure 122 may be fixedly connected to the middle part of the diaphragm 121 (the middle part of the diaphragm 121 is schematically illustrated by a dotted line in FIG6 ). The middle part of the diaphragm 121 and the first vibration structure 122 may constitute the middle part 123 of the first vibration component 12. The first vibration structure 122 may be used to drive the middle part of the diaphragm 121 to vibrate at a first frequency, thereby driving the air in the vibration space 101 to vibrate and forming a first sound wave. The outer periphery of the diaphragm 121 may be fixed to the first base 11. The outer periphery of the diaphragm 121 may constitute the outer periphery 124 of the first vibration component 12. It should be noted that the middle part refers to the area between two points. In FIG6 , the middle part 123 of the first vibration component 12 is located between the outer peripheries 124 on both sides.

[0070] In some embodiments, the middle portion 123 of the first vibrating component 12 can vibrate in a first direction. The first direction is the direction from the first vibrating component 12 toward the second vibrating component 22. In other embodiments, the vibration direction of the middle portion 123 of the first vibrating component 12 can also be set at an angle to the first direction.

[0071] For example, the first vibration structure 122 may be fixedly connected to a side surface of the diaphragm 121 away from the second vibration component 22. The first base 11 may be fixed to a side surface of the diaphragm 121 away from the second vibration component 22. In other embodiments, the first vibration structure 122 may be fixedly connected to a side surface of the diaphragm 121 close to the second vibration component 22.

[0072] As shown in FIG5 , the first base 11 can be annular. The first vibrating structure 122 can be located within the ring of the first base 11. This allows for a larger connection area between the outer periphery of the diaphragm 121 and the first base 11. Furthermore, the first base 11 can be annular, with the outer periphery of the diaphragm 121 fixedly connected to the first base 11. During vibration, the force applied to the diaphragm 121 is more evenly distributed, preventing the diaphragm 121 from shaking left and right.

[0073] In some embodiments, the first vibration structure 122 may adopt a piezoelectric sheet structure. The sound-generating device 100 may further include a first feeding circuit (not shown). The first feeding circuit is electrically connected to the first vibration structure 122, and is used to transmit an electrical signal to the first vibration structure 122. Exemplarily, the first vibration structure 122 may include a piezoelectric material layer, for example, the piezoelectric material layer may adopt a piezoelectric material such as lead zirconate titanate piezoelectric ceramics (PZT for short). By transmitting an electrical signal to the first vibration structure 122, the first vibration structure 122 may vibrate at a first frequency, and then the middle part of the diaphragm 121 may be driven to vibrate at the first frequency. It is understandable that the vibration frequency of the first vibration structure 122 may be changed by adjusting the electrical signal transmitted to the first vibration structure 122. Those skilled in the art may set the range of the first frequency as required.

[0074] It is understandable that the first vibration structure 122 adopts a piezoelectric sheet structure. Compared with the solution of using a magnetic circuit system to achieve vibration of the diaphragm 121 in traditional speakers, the piezoelectric sheet is smaller in size, which is conducive to reducing the volume of the sound-generating device 100.

[0075] It is understandable that the piezoelectric piece is only one embodiment of the first vibration component 12 to achieve vibration. In other embodiments, the first vibration structure 122 can also adopt a mechanical vibration structure to achieve vibration of the diaphragm 121. This application does not impose specific restrictions on the way in which the first vibration component 12 achieves vibration.

[0076] In some embodiments, the diaphragm 121 may be made of a metal material, so that the diaphragm 121 has better strength.

[0077] In some embodiments, the difference between the first frequency and the resonant frequency of the first vibration component 12 is less than or equal to a threshold value. It should be noted that the difference between the first frequency and the resonant frequency of the first vibration component 12 is an absolute value. The difference between the first frequency f1 and the resonant frequency f3 of the first vibration component 12 is |f1-f3|. In other words, the first frequency f1 can be greater than or equal to the resonant frequency f3 of the first vibration component 12, or less than or equal to the resonant frequency f3 of the first vibration component 12.

[0078] In some embodiments, the threshold value may be less than or equal to 500 Hz. For example, the threshold value may be 500 Hz, and the first frequency f1 and the resonant frequency f3 of the first vibration component 12 satisfy: |f1-f3|≤500 Hz. In other embodiments, the threshold value may also be 20 Hz, 100 Hz, 200 Hz, etc. It is understandable that setting the first frequency to be close to or equal to the resonant frequency of the first vibration component 12 can improve the vibration efficiency of the sound-generating device 100. Those skilled in the art can use simulation tools to design the first vibration component 12, and the resonant frequency of the first vibration component 12 meets the preset value.

[0079] As shown in Figures 6 and 7, the second vibration component 22 can enclose an acoustic channel 102 with the outer periphery 124 of the first vibration component 12 (the acoustic channel 102 is schematically illustrated by a dotted box in Figure 6). The vibration space 101 is connected to the external space through the acoustic channel 102. In this way, the first sound wave can also be transmitted to the external space through the acoustic channel 102. It should be noted that the external space refers to the external space of the sound-emitting device 100. For example: when the sound-emitting device 100 is arranged inside the electronic device 1, the outside world may refer to the internal space of the electronic device 1 (such as the second inner cavity 3 shown in Figure 3). When the sound-emitting device 100 is exposed to the electronic device 1, the external space may be the external environment in which the sound-emitting device 100 or the electronic device 1 is located. The connection may be direct or indirect. The outer periphery 124 of the first vibration component 12 refers to the peripheral portion of the first vibration component 12 close to the external space.

[0080] The outer edge 223 of the second vibrating assembly 22 reciprocates, causing the acoustic channel 102 to open and close at a second frequency, which is different from the first frequency. The first sound wave is modulated by the acoustic channel 102 to form a second sound wave. The outer edge 223 of the second vibrating assembly 22 refers to the edge of the second vibrating assembly 22 that is away from the vibration space 101.

[0081] It is understandable that the sound-emitting device 100 of the present application adopts a sound-emitting method different from that of traditional speakers. On the one hand, the first sound wave is formed by setting the middle part of the first vibration structure 122 to vibrate at a first frequency. On the other hand, the outer periphery 223 of the second vibration component 22 and the first vibration structure 122 enclose the acoustic channel 102, and the second vibration component 22 reciprocates relative to the outer periphery of the first vibration component 12, so that the acoustic channel 102 opens and closes at a second frequency, so that the first sound wave can be modulated by the acoustic channel 102 to form a second sound wave. While forming the first sound wave, the first vibration structure 122 also participates in the formation of the acoustic channel 102, and has the effect of "one thing with two uses". The sound-emitting device 100 does not need to set up an additional structure to form the acoustic channel 102, which can reduce the volume of the sound-emitting device 100. Compared with traditional speakers, the sound-emitting device 100 of the present application has a simpler structure and is less difficult to process and assemble.

[0082] In some embodiments, the second sound wave may include an audible sound, and the first frequency may be greater than the frequency of the audible sound in the second sound wave. It is understood that the high-frequency first sound wave can be modulated by the acoustic channel 102 to form a lower-frequency audible sound, and the sound pressure value of the audible sound can be equal to or close to the sound pressure value of the first sound wave. Compared to the sound pressure value of a sound of the same frequency as the audible sound emitted by a traditional speaker, the sound-emitting device 100 of the present application has a higher sound pressure value when the audible sound frequency is the same. In other words, the sound-emitting device 100 of the present application has better low-frequency acoustic performance.

[0083] An implementation method of opening and closing the acoustic channel 102 will be described in detail below with reference to FIG. 6 .

[0084] Please refer to Figure 6 again. The opening and closing of the acoustic channel 102 includes two movements: the opening of the acoustic channel 102 and the closing of the acoustic channel 102. Both movements are a process, not just a momentary state. The outer periphery 223 of the second vibration component 22 moves back and forth, and the outer periphery 223 of the second vibration component 22 approaches or moves away from the outer periphery 124 of the first vibration component 12, so that the acoustic channel 102 continuously repeats the opening process and the closing process. Among them, when the sound-emitting device 100 is not working, the distance between the outer periphery 223 of the second vibration component 22 and the outer periphery 124 of the first vibration component 12 is d0. During the closing process of the acoustic channel 102, the outer periphery 223 of the second vibration component 22 approaches the outer periphery 124 of the first vibration component 12, and the distance between the outer periphery 223 of the second vibration component 22 and the outer periphery 124 of the first vibration component 12 gradually decreases, and the distance between the outer periphery 223 of the second vibration component 22 and the outer periphery 124 of the first vibration component 12 reaches a preset minimum value (for the convenience of description, the minimum value is represented by d1 below). The acoustic channel 102 switches from the closing process to the opening process. During the opening process of the acoustic channel 102, the outer periphery 223 of the second vibration component 22 gradually moves away from the outer periphery 124 of the first vibration component 12, and the distance between the outer periphery 223 of the second vibration component 22 and the outer periphery 124 of the first vibration component 12 gradually increases. When the distance between the outer periphery 223 of the second vibration component 22 and the outer periphery 124 of the first vibration component 12 reaches a preset maximum value (for the convenience of description, the maximum value is represented by d2 below).

[0085] Exemplarily, the surface of the first vibration component 12 facing the second vibration component 22 is the first surface 125. The surface of the second vibration component 22 facing the first vibration component 12 is the second surface 221. The distance between the outer periphery 223 of the second vibration component 22 and the outer periphery 124 of the first vibration component 12 can be the distance from the outer periphery 2211 of the second surface 221 to the first surface 125 along the first direction. It should be noted that during the reciprocating motion of the outer periphery 223 of the second vibration component 22, there may be an angle between the plane where the outer periphery 2211 of the second surface 221 is located and the first surface 125, and the distance from different positions on the outer periphery 2211 to the first surface 125 may be different. At this time, the distance from the outer periphery 2211 of the second surface 221 to the first surface 125 can be the average value of the distances from each position on the outer periphery 2211 to the first surface 125.

[0086] During the reciprocating motion of the outer periphery 223 of the second vibrating assembly 22, the real-time distance dt from the outer periphery 2211 of the second surface 221 to the first surface 125 along the first direction is d1, where d1≤dt≤d2. The opening and closing of the acoustic channel 102 at the second frequency can be understood as the primary frequency of dt changing at the second frequency.

[0087] In some embodiments, d1 can be 0 mm. It should be noted that due to process limitations, during the manufacturing and assembly of the sound-generating device 100, d1 can be a value as close to 0 as possible, for example, d1 ≤ 0.06 mm. In this case, the vibration space 101 is disconnected from the external space. The acoustic channel 102 blocks the first sound wave 100%, preventing the first sound wave from reaching the external space.

[0088] When the sound-generating device 100 is not in operation, the initial position of the second vibration component 22 can be set according to actual needs, that is, d1≤d0≤d2. This application does not impose any restrictions on this. The second vibration component 22 shown in Figure 6 has d1<d0<d2. The size of d2 is not limited in this application and can be designed according to needs.

[0089] FIG5 illustrates by dotted lines the position S1 (dt=d1) where the distance between the outer periphery 223 of the second vibration component 22 and the outer periphery 124 of the first vibration component 12 reaches a preset minimum value, the position S2 (dt=d2) where the distance between the outer periphery 223 of the second vibration component 22 and the outer periphery 124 of the first vibration component 12 reaches a preset maximum value, and the position S0 (dt=d0) where the second vibration component 22 is stationary.

[0090] In some embodiments, when the sound-generating device 100 is not in operation, the first surface 125 may be parallel to the second surface 221. In other embodiments, the first surface 125 may be arranged at an angle to the second surface 221.

[0091] It is understood that the reciprocating motion of the outer periphery 223 of the second vibrating assembly 22, approaching or moving away from the outer periphery 124 of the first vibrating assembly 12, is a relative concept. When the outer periphery 223 of the second vibrating assembly 22 reciprocates, the outer periphery 124 of the first vibrating assembly 12 can be stationary or vibrating.

[0092] The first vibrating assembly vibrates at a first frequency f1, generating a first sound wave. The first sound wave radiates outward along the acoustic channel 102. The acoustic channel 102, in cooperation with the second vibrating assembly 22 and the first vibrating assembly 12, opens and closes at a second frequency f2, thereby changing the radiation state of the first sound wave, modulating the first sound wave to generate a second sound wave. The frequencies of the second sound wave may include |f1+f2| and |f1-f2|.

[0093] The sound wave of the frequency |f1+f2| can be an audible sound or an ultrasonic sound. The sound wave of the frequency |f1-f2| can be an audible sound or an ultrasonic sound. The frequency of the second sound wave can be controlled by setting the magnitude of the first frequency f1 and the second frequency f2. For example, the first frequency f1 is set to 21kHz and the second frequency f2 is set to 20.5kHz. Thus, |f1+f2|=41.5kHz, which is an ultrasonic sound; |f1-f2|=500kHz, which is an audible sound. The second sound wave can include two frequencies, 41.5kHz and 500Hz, and the sound-generating device 100 can emit an ultrasonic sound and an audible sound. For example, the first frequency f1 is set to 500Hz and the second frequency f2 is set to 550Hz. Thus, |f1+f2|=1050Hz, which is an audible sound; |f1-f2|=50Hz, which is an audible sound. The second sound wave may include sounds of two frequencies, 550 Hz and 50 Hz, and the sound-generating device 100 may emit two audible sounds.

[0094] The first frequency f1 can be a single frequency or a frequency band. The second frequency f2 can be a single frequency or a frequency band. It is understandable that by setting the first frequency f1 and the second frequency f2 to be a single frequency or a frequency band, the two frequency bands |f1+f2| and |f1-f2| included in the second sound wave can be adjusted to be a single frequency or a frequency band. For example, the first frequency f1=21kHz, and the second frequency f2 is in the range of 21.02kHz to 22kHz. In this way, the range of |f1-f2| is in the range of 20Hz to 1000Hz, which is a frequency band. The range of |f1+f2| is in the range of 42.02Hz to 43kHz, which is a frequency band.

[0095] In some embodiments, when |f1-f2| is a frequency band range, part of the range of |f1-f2| may be audible sound. For example, the range of |f1-f2| may be in the range of 20 Hz to 25 kHz. Alternatively, the entire range of |f1-f2| may be audible sound. For example, the range of |f1-f2| may be in the range of 100 Hz to 500 Hz.

[0096] In some embodiments, the first frequency f1 and the second frequency f2 satisfy the following conditions: 20 Hz ≤ |f1-f2| ≤ 20 kHz, and 20 kHz ≤ |f1+f2|. It is understood that by setting the magnitudes of the first frequency f1 and the second frequency f2, the second sound wave comprises two frequencies of sound, one of which is audible and the other of which falls within the ultrasonic frequency range. When the sound-generating device 100 emits sound, the second sound wave's frequencies within the ultrasonic range will not be received by the user, and the user will only hear an audible sound, resulting in less noise from the sound-generating device 100.

[0097] In some embodiments, the first frequency f1 and the second frequency f2 further satisfy: f1 ≥ 20 kHz, f2 ≥ 20 kHz. It is understood that by setting the first frequency f1 and the second frequency f2 to ultrasonic frequencies, the first frequency f1 and the second frequency f2 will not be heard by the user when the sound-generating device 100 emits sound, and the sound-generating device 100 produces less noise. Furthermore, by setting the first frequency f1 and the second frequency f2 to ultrasonic frequencies, it is also possible to ensure that the sound wave of |f1+f2| in the second sound wave falls within the ultrasonic frequency range, and the sound wave of frequency |f1+f2| in space cannot be heard by the human ear. Furthermore, by setting the first frequency f1 and the second frequency f2 to ultrasonic frequencies, the sound-generating device 100 can achieve a higher sound pressure value with a smaller vibration displacement. When the frequency |f1-f2| is audible, the sound pressure value of the second sound wave is higher, and the low-frequency performance of the sound-generating device 100 is better.

[0098] Several implementations of the second vibration component 22 and the outer periphery 124 of the first vibration component 12 enclosing the acoustic channel 102 will be described in detail below with reference to the accompanying drawings.

[0099] As shown in Figure 6, the second vibration component 22 can be an integral structural member. The middle portion 222 of the second vibration component 22 can be arranged opposite to the middle portion 123 of the first vibration component 12. The middle portion 222 of the second vibration component 22 can be fixed to the second base 21. The outer periphery 223 of the second vibration component 22 and the outer periphery 124 of the first vibration component 12 are arranged opposite to each other. The outer periphery 223 of the second vibration component 22 can enclose the acoustic channel 102 together with the outer periphery 124 of the first vibration component 12. In Figure 6, the middle portion 222 of the second vibration component 22 is located between the outer peripheries 223 on both sides.

[0100] In other embodiments, in addition to the outer periphery 223, the second vibration component 22 may have more parts and the outer periphery 124 of the first vibration component 12 to enclose the acoustic channel 102. This will be described in detail later through specific embodiments and will not be repeated here.

[0101] Acoustic channel 102 may be annular in shape. Acoustic channel 102 may be disposed around vibration space 101. It is understood that, compared to a solution in which acoustic channel 102 is located on one side of vibration space 101, an annular acoustic channel 102 disposed around vibration space 101 can extend its length. When controlling acoustic channel 102 to open and close at the second frequency, the adjustable range of acoustic channel 102 is larger.

[0102] In some embodiments, the second vibration component 22 can be a piezoelectric piece. The sound-emitting device 100 can also include a second feeding circuit (not shown). The second feeding circuit can be electrically connected to the second vibration component 22 for transmitting an electrical signal to the second vibration component 22. The second vibration component 22 vibrates according to the electrical signal. Exemplarily, the second vibration component 22 can include a piezoelectric material layer, for example, the piezoelectric material layer can be made of piezoelectric materials such as lead zirconate titanate piezoelectric ceramics (PZT). When the second vibration component 22 is energized and begins to vibrate, since the middle part 222 of the second vibration component 22 is fixed to the second base 21, the middle part 222 of the second vibration component 22 does not move, and the outer periphery 223 of the second vibration component 22 moves back and forth.

[0103] It can be understood that the second vibration component 22 adopts a piezoelectric sheet structure. Compared with the solution of using a traditional mechanical motion structure to achieve reciprocating motion of the outer periphery 223 of the second vibration component 22, the volume of the piezoelectric sheet is smaller, which is conducive to reducing the volume of the sound-generating device 100.

[0104] It can be understood that when the second vibration component 22 can be a piezoelectric piece, the vibration frequency of the outer periphery 223 of the second vibration component 22 can be controlled by adjusting the frequency of the electrical signal transmitted by the second feeding circuit, thereby affecting the opening and closing frequency of the acoustic channel 102, that is, the size of the second frequency.

[0105] In other embodiments, the second vibration component 22 may also be a sheet-like structure or a plate-like structure. The sound-generating device 100 may further include a second vibration structure (not shown). The second vibration structure may be a mechanical motion structure for driving the second vibration component 22 to perform reciprocating motion so that the acoustic channel 102 can open and close at a second frequency. Exemplarily, the outer periphery of the second vibration component 22 may be fixed to the second vibration structure. It is understood that this application does not impose specific restrictions on the vibration mode of the second vibration component.

[0106] In some embodiments, the reciprocating motion may be reciprocating rotation or reciprocating movement. As shown in FIG6 , the outer periphery 223 of the second vibration component 22 is in reciprocating rotation.

[0107] In some embodiments, the difference between the second frequency and the resonant frequency of the second vibration component 22 can be less than or equal to a threshold value. It should be noted that the difference between the second frequency and the resonant frequency of the second vibration component 22 is an absolute value. The second frequency f2 and the resonant frequency f4 of the second vibration component 22 are equal to |f2-f4|. In other words, the second frequency f2 can be greater than or equal to the resonant frequency f4 of the second vibration component 22, or less than or equal to the resonant frequency f4 of the second vibration component 22.

[0108] In some embodiments, the threshold value may be less than or equal to 500 Hz. For example, the threshold value may be 500 Hz, and the second frequency f2 and the resonant frequency f4 of the second vibration component 22 satisfy the following relationship: |f2-f4|≤500 Hz. In other embodiments, the threshold value may also be 20 Hz, 100 Hz, 200 Hz, etc. It will be appreciated that setting the second frequency close to or equal to the resonant frequency of the second vibration component 22 can improve the vibration efficiency of the sound-generating device 100.

[0109] It is understandable that by adjusting the material and geometric dimensions of the second vibration component 22, the resonant frequency of the second vibration component 22 can be adjusted so that the resonant frequency is within the desired frequency range. For example, the resonant frequency of the second vibration component 22 is designed to be 23kHz, so as to be suitable for a sound-generating device 100 that needs to generate audible sounds of medium and low frequencies. The second vibration component 22 is illustrated as a disc-shaped structure. The second vibration component 22 includes a piezoelectric plate and a metal plate. The piezoelectric plate is the same size as the metal plate. The piezoelectric plate can be pressed onto the metal plate by an adhesive layer. The second base 21 is cylindrical and fixedly connected to the center of the second vibration component 22. The resonant frequency of the second vibration component 22 is approximately 23kHz. The piezoelectric plate is made of PZT 5H material with a radius of 3.56mm and a thickness of 0.2mm. The metal plate is made of a nickel-based alloy material with a radius of 3.56mm and a thickness of 0.2mm. The cylindrical radius of the second base 21 is 0.5mm. Those skilled in the art can use simulation tools to design the second vibration component 22 so that the resonance frequency of the second vibration component 22 meets a preset value.

[0110] In some embodiments, along the first direction, the distance between the first vibration component 12 and the second vibration component 22 may be less than 1 mm. The first direction is the direction from the first vibration component 12 to the second vibration component 22. It is understandable that the distance between the first vibration component 12 and the second vibration component 22 is small, and the thickness of the sound-emitting device 100 in the first direction is small, which is conducive to the miniaturization of the sound-emitting device 100. In addition, the vibration distance of the first vibration component 12 is small, and the vibration amplitude of the middle part 123 of the first vibration component 12 during the vibration process is also small. When the sound-emitting device 100 is installed in the internal space of the electronic device 1, the sound-emitting device 100 can reduce the risk of the first vibration component 12 causing the housing and / or keyboard of the electronic device 1 to vibrate during the sound-emitting process, and can also reduce the airflow noise problem caused by large-amplitude vibration.

[0111] In some embodiments, along the first direction, the thickness of the sound-generating device 100 is less than 2.0 mm. The smaller thickness of the sound-generating device 100 is conducive to miniaturization of the sound-generating device 100.

[0112] In some embodiments, the technical content of the sound-generating device 100 that is the same as that of the previous embodiments is not repeated. FIG8 is an exploded schematic diagram of another embodiment of the sound-generating device 100 shown in FIG4 . FIG9 is a partial cross-sectional view of another embodiment of the sound-generating device 100 shown in FIG4 at section line BB.

[0113] As shown in Figures 8 and 9, the middle portion 222 of the second vibration component 22 can be provided with a first through hole 211. In this case, the second vibration component 22 can be annular as a whole (as shown in Figure 8). The middle portion 222 of the second vibration component 22 is fixedly connected to the second base 21. The middle portion 123 of the first vibration component 12 can be arranged opposite to the second base 21. The second vibration component 22 and the outer periphery 124 of the first vibration component 12 can enclose the acoustic channel 102. The acoustic channel 102 can be annular.

[0114] In some embodiments, the middle portion 123 of the first vibration component 12 can enclose a vibration space 101 with the second vibration component 22 and the second base 21. In some embodiments, the middle portion 123 of the first vibration component 12 can enclose a vibration space 101 with the second base 21.

[0115] In some embodiments, the second base 21 is fixedly connected to a surface of the second vibration component 22 that is away from the first vibration component 12. In other embodiments, the second base 21 can also be fixedly connected to the inner wall surface of the first through hole 211.

[0116] It can be understood that the middle part 222 of the second vibration component 22 is provided with a first through hole 211. On the one hand, without increasing the height of the sound-emitting device 100 in the first direction, the height of the vibration space 101 can be increased, thereby reducing the risk of the middle part 123 of the first vibration component 12 interfering with the second vibration component 22 or the second base 21 during vibration, thereby reducing the risk of failure of the sound-emitting device 100; on the other hand, the volume of the second vibration component 22 can be reduced, saving materials and reducing the cost of the sound-emitting device 100.

[0117] It is understood that the profile of the outer side of the second vibration component 22 can be a circle as shown in Figure 8, or a rectangle, triangle, or other irregular shape. The first through hole 211 can be a circle as shown in Figure 8, or a rectangle, triangle, or other irregular shape. This application does not impose any restrictions.

[0118] In some embodiments, the same technical content as that of the sound-generating device 100 in the previous embodiments is not repeated. FIG10 is a schematic structural diagram of another embodiment of the sound-generating device 100 provided in an embodiment of the present application from another angle. FIG11 is a partial cross-sectional view of an embodiment of the sound-generating device 100 shown in FIG10 at section line CC.

[0119] As shown in Figures 10 and 11, the first base 11 can be fixedly connected to one side of the second base 21, and the second vibration component 22 can be fixed to one side of the second base 21 and spaced apart from the first base 11. The second vibration component 22 and a portion of the outer periphery 124 of the first vibration component 12 enclose an acoustic channel 102. The middle portion 123 of the first vibration component 12 can be arranged opposite to the second base 21, enclosing a vibration space 101. In this case, the acoustic channel 102 can be located on one side of the vibration space 101.

[0120] It can be understood that when the acoustic channel 102 can be located on one side of the vibration space 101, the second sound wave can be transmitted from the side where the acoustic channel 102 is located to the external space. The sound direction of the sound-emitting device 100 can be controlled. For example, when the sound-emitting device 100 is installed inside the electronic device 1, the second vibration component 22 can be fixed to the side of the second base 21 close to the sound outlet 201. Compared with setting up a ring-shaped acoustic channel 102, the loss of sound inside the electronic device 1 is reduced, and the sound emitted by the sound-emitting device 100 can pass through the sound outlet 201 to the outside of the electronic device 1 as much as possible, and the sound effect of the electronic device 1 is better.

[0121] Furthermore, when the sound-generating device 100 is fixed to the electronic device 1, either the first base 11 or the second base 21 can be fixedly connected to the electronic device 1 to achieve the fixation of the sound-generating device 100. Compared to a solution in which the first base 11 and the second base 21 are separately mounted on the electronic device 1, the risk of misalignment between the first vibration component 12 and the second vibration component 22 can be reduced, the assembly precision of the sound-generating device 100 is higher, and the installation difficulty of the sound-generating device 100 is reduced.

[0122] In some embodiments, the first base 11 and the second base 21 are fixedly connected, and the first base 11 and the second base 21 can constitute the housing of the sound-generating device 100. The first base 11 and the second base 21 can protect the first vibration component 12 and the second vibration component 22. In this case, the sound-generating device 100 is a whole unit, and the sound-generating device 100 can be used and sold as a separate product.

[0123] Exemplarily, the second base 21 may include a first portion 212 and a second portion 213 (the first portion 212 and the second portion 213 are schematically distinguished by dotted lines in Figures 10 and 11). The first portion 212 may be arranged opposite to the first vibration component 12. The second vibration component 22 may be fixed to one side of the second base 21. The second portion 213 is connected to one side of the first portion 212 and is spaced apart from the second vibration component 22. Exemplarily, the second base 21 may be fixedly connected to the first base 11 by gluing.

[0124] FIG12 a is a schematic structural diagram of another embodiment of the sound-generating device provided in an embodiment of the present application at another angle.

[0125] The number of second vibration components 22 can be one or more. As shown in Figure 10, the number of second vibration components 22 can be one, and one second vibration component 22 is fixedly connected to one side of the second base 21. As shown in Figure 12a, the number of second vibration components 22 can be multiple, and the multiple second vibration components 22 are arranged at intervals. It is understood that by adjusting the position of the second vibration component 22, the sound emission direction of the sound-emitting device 100 can be adjusted.

[0126] In some embodiments, when there are multiple second vibration components 22, the multiple second vibration components 22 can enclose multiple acoustic channels 102 together with the outer periphery 124 of the first vibration component 12, and the multiple acoustic channels 102 can be arranged at intervals (as shown in Figure 12a, where the acoustic channels 102 are illustrated by filling patterns in Figure 12a).

[0127] FIG12 b is a schematic structural diagram of another embodiment of the sound-generating device provided in an embodiment of the present application at another angle.

[0128] In some embodiments, the first vibration component 12 can be rectangular, circular, or other polygonal. The second vibration component 22 can be rectangular (as shown in Figures 10 and 12a), arc-shaped (as shown in Figure 12b), or other irregular shapes. The shape of the second vibration component can be selected in many ways and is not limited by this application.

[0129] The shape of the acoustic channel 102 can be adjusted by adjusting the shape of the second vibration component 22. In some embodiments, the acoustic channel 102 can be linear or arc-shaped. For example, the acoustic channel 102 shown in Figures 10 and 12a is linear (the acoustic channel 102 is schematically illustrated by a filling pattern in Figures 10 and 12a). The acoustic channel 102 shown in Figure 12b is arc-shaped (the acoustic channel 102 is schematically illustrated by a filling pattern in Figure 12b). It can be understood that when the acoustic channel 102 can be located on one side of the vibration space 101, the shape of the acoustic channel 102 can be various, so that the direction in which the sound is emitted by the sound-emitting device can be adjusted. For example, when the acoustic channel 102 is arc-shaped, the central angle corresponding to the arc can be adjusted, so that the coverage range of the sound emitted by the sound-emitting device 100 can be changed.

[0130] The shape of the acoustic channel 102 can be adjusted according to the shapes of the first vibration component 12 and the second vibration component 22, and this application does not impose any limitation.

[0131] In some embodiments, the same technical contents as those of the sound generating device 100 in the above embodiments are not described in detail. Fig. 13 is a partial cross-sectional view of another embodiment of the electronic device 1 shown in Fig. 1 at section line AA.

[0132] As shown in Figure 13, electronic device 1 includes a sound-emitting device 100, a housing 200, and a screen 300. The housing 200 is a one-piece structure. The screen 300 is mounted on the housing 200. The screen 300 and the housing 200 can enclose the inner cavity of the electronic device 1. The sound-emitting device 100 can be mounted in the inner cavity of the electronic device 1. The screen 300 and the housing 200 form the outer shell of the electronic device 1.

[0133] For example, the sound-generating device 100 may include a first transducer 10 and a second transducer 20. The first transducer 10 includes a first base 11 and a first vibration assembly 12, the periphery of which is fixed to the first base 11. The second transducer 20 includes a second base 21 and a second vibration assembly 22, which is fixed to the second base 21. The first base 11 may be fixedly connected to the screen 300, and the second base 21 may be fixedly connected to the housing 200.

[0134] In other embodiments, the first base 11 may also be fixedly connected to the housing 200 , and the second base 21 may also be fixedly connected to the screen 300 .

[0135] The above-mentioned sound-generating device 100 of the present application can be used to form audible sounds of medium and low frequencies (20Hz-2000Hz), and can also be used to form audible sounds of the full frequency band (20Hz-20000Hz). The sound-generating device 100 can be used alone, or multiple sound-generating devices 100 can be used in combination, or can be used in combination with other speakers of the same or different types such as piezoelectric speakers and dynamic speakers. For example, the sound-generating device 100 of the present application can produce audible sounds of medium and low frequencies, and speakers such as piezoelectric speakers and dynamic speakers can produce audible sounds of high frequencies.

[0136] It can be understood that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other, and any combination of features in different embodiments is also within the scope of protection of the present application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

[0137] It should be understood that all the above drawings are illustrative illustrations of the present application and do not represent the actual size of the product. Moreover, the dimensional ratios between the components in the drawings are not intended to limit the actual product of the present application.

[0138] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A sound generating device (100), characterized in that, It includes a first transducer (10) and a second transducer (20). The first transducer (10) includes a first base (11) and a first vibration assembly (12). The outer peripheral edge (124) of the first vibration assembly (12) is fixed to the first base (11). The second transducer (20) includes a second base (21) and a second vibration assembly (22). The second vibration assembly (22) is fixed to the second base (21). The second vibration assembly (22) and the first vibration assembly (12) are opposite and spaced apart. The middle part (123) of the first vibration assembly (12) and the second transducer (20) enclose a vibration space (101). The outer peripheral edges (124) of the second vibration assembly (22) and the first vibration assembly (12) enclose an acoustic channel (102). The vibration space (101) communicates with the external space through the acoustic channel (102).

2. The sound generating device (100) according to claim 1, wherein, The middle part of the second vibration assembly (22) and the middle part (123) of the first vibration assembly (12) are opposite to each other. The middle part of the second vibration assembly (22) is fixed to the second base (21). The outer peripheral edge (223) of the second vibration assembly (22) and the outer peripheral edge (124) of the first vibration assembly (12) are opposite to each other. The outer peripheral edges (223) of the second vibration assembly (22) and the first vibration assembly (12) enclose an acoustic channel (102).

3. The sound generating device (100) according to claim 2, characterized in that, A first through hole is provided in the middle part of the second vibration assembly (22). The middle part (123) of the first vibration assembly (12) and the second base (21) are opposite to each other.

4. The sound generating device (100) according to claim 2 or 3, characterized in that, The acoustic channel (102) is annular.

5. The sound generating device (100) according to claim 1, wherein, The first base (11) is fixedly connected to the second base (21). The second vibration assembly (22) is fixed to one side of the second base (21) and is spaced apart from the first base (11). The middle part (123) of the first vibration assembly (12) and the second base (21) are opposite to each other. The acoustic channel (102) is located on one side of the vibration space (101).

6. The sound generating device (100) according to claim 5, characterized in that, The acoustic channel (102) is linear or arc-shaped.

7. The sound generating device (100) according to claim 5 or 6, characterized in that, The number of the second vibration assemblies (22) is multiple, and the multiple second vibration assemblies (22) are spaced apart.

8. The sound generating device (100) according to claim 1, characterized in that, The shape of the second vibration assembly (22) is circular, annular, rectangular or arc-shaped.

9. The sound generating device (100) according to any one of claims 1 to 8, characterized in that, The second vibration assembly (22) is a piezoelectric sheet. The sound generating device (100) further includes a second feeding circuit. The second feeding circuit is electrically connected to the second vibration assembly (22) for transmitting an electrical signal to the second vibration assembly (22).

10. The sound generating device (100) according to any one of claims 1 to 9, characterized in that, In the first direction, the distance between the first vibration assembly (12) and the second vibration assembly (22) is less than 1 mm. The first direction is the direction in which the first vibration assembly (12) faces the second vibration assembly (22).

11. The sound generating device (100) according to any one of claims 1 to 10, characterized in that, The middle part (123) of the first vibration component (12) vibrates at a first frequency to form a first sound wave. The outer peripheral edge (223) of the second vibration component (22) makes a reciprocating motion, causing the acoustic channel (102) to open and close at a second frequency. The first frequency is different from the second frequency. The first sound wave is modulated by the acoustic channel (102) to form a second sound wave; The second sound wave includes audible sound, and the first frequency is greater than the frequency of the audible sound in the second sound wave.

12. The sound generating device (100) according to claim 11, wherein, The reciprocating motion is a reciprocating rotation or a reciprocating translation.

13. The sound generating device (100) according to claim 11 or 12, characterized in that, The difference between the first frequency and the resonance frequency of the first vibration component (12) is less than or equal to a threshold value; And / or, the difference between the second frequency and the resonance frequency of the second vibration component (22) is less than or equal to the threshold value; The threshold value is less than or equal to 500 Hz.

14. The sound generating device (100) according to any one of claims 11 to 13, characterized in that, The first frequency f1 is a single frequency or a frequency band range; The second frequency f2 is a single frequency or a frequency band range.

15. The sound generating device (100) according to any one of claims 11 to 14, characterized in that, The frequency of the second sound wave includes |f1 - f2| and |f1 + f2|, and the first frequency f1 and the second frequency f2 satisfy: |f1 - f2| is at least partially within a range less than or equal to 20 KHz, and 20 kHz ≤ |f1 + f2|.

16. The sound generating device (100) according to any one of claims 11 to 15, characterized in that, The first frequency f1 and the second frequency f2 also satisfy: f1 ≥ 20 kHz, f2 ≥ 20 kHz.

17. An electronic device (1), characterized in that, Including the sound generating device (100) according to any one of claims 1 to 16.

18. The electronic device (1) according to claim 17, characterized in that, The electronic device (1) further includes a housing, and the sound generating device (100) is installed in the housing.

19. The electronic device (1) according to claim 18, characterized in that, The housing includes a screen (300), a middle frame (220), and a rear cover (210), and the middle frame (220) is connected between the screen (300) and the rear cover (210); The first base (11) of the first transducer (10) is fixed to the middle frame (220), and the second base (21) of the second transducer (20) is fixed to the rear cover (210); or The first base (11) of the second transducer (20) is fixed to the middle frame (220), and the second base (21) of the first transducer (10) is fixed to the rear cover (210); or The first base (11) of the first transducer (10) is fixed to the middle frame (220), and the second base (21) of the second transducer (20) is fixed to the screen (300); or The first base (11) of the second transducer (20) is fixed to the middle frame (220), and the second base (21) of the first transducer (10) is fixed to the screen (300).

20. The electronic device (1) according to claim 18, characterized in that, The housing includes a screen (300) and a housing body (200), and the screen (300) is installed in the housing body (200); The first base (11) of the first transducer (10) is fixed to the screen (300), and the second base (21) of the second transducer (20) is fixed to the housing body (200); or The first base (11) of the first transducer (10) is fixed to the housing (200), and the second base (21) of the second transducer (20) is fixed to the screen (300).

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