Sound production device and electronic equipment

Abstract

The invention provides a sound production device and electronic equipment. The sound production device comprises a first transducer and a second transducer, the first transducer comprises a first base and a first vibration assembly, the outer periphery of the first vibration assembly is fixed to the first base, the second transducer comprises a second base and a second vibration assembly, and the second vibration assembly is fixed to the second base. The second vibration assembly and the first vibration assembly are oppositely arranged at an interval. A vibration space is defined by the middle of the first vibration assembly and the second transducer, an acoustic channel is defined by the second vibration assembly and the outer periphery of the first vibration assembly, and the vibration space is communicated with an external space through the acoustic channel. The sounding device is simple in structure and small in size.

Description

Technical Field

[0001] This application relates to the field of audio technology, and particularly to a sound generating device and an electronic device. Background Art

[0002] Speakers are widely used in many current consumer electronic products, providing audio entertainment for consumers and enhancing the audio experience. When a speaker operates at low frequencies, it is necessary to increase the displacement of the diaphragm so that the sound pressure of the speaker at low frequencies meets the requirements. The diaphragm of the speaker requires a large vibration space, resulting in a relatively large volume of the speaker. Summary of the Invention

[0003] This application provides a sound generating device and an electronic device.

[0004] In a first aspect, an embodiment of this 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 assembly. The outer periphery of the first vibration assembly is fixed to the first base. The second transducer includes a second base and a second vibration assembly. The second vibration assembly is fixed to the second base. The second vibration assembly and the first vibration assembly are opposite and spaced apart. The middle part of the first vibration assembly and the second transducer enclose a vibration space, and the outer peripheries of the second vibration assembly and the first vibration assembly enclose an acoustic channel. The vibration space communicates with the external space through the acoustic channel.

[0005] It can be understood that the middle part of the first vibration assembly can vibrate at a first frequency to form a first sound wave. The outer periphery of the second vibration assembly can perform a reciprocating motion, so that the acoustic channel opens and closes at a second frequency. The first frequency and the second frequency are different. The first sound wave is modulated by the acoustic channel to form a second sound wave. The sound generating device of this application adopts a sound generating method different from that of traditional speakers. While the first vibration structure forms the first sound wave, it also participates in forming the acoustic channel, having the function of "one thing for two uses". The sound generating device does not need to additionally set up a structure to form the acoustic channel, and the volume of the sound generating device is relatively small.

[0006] In some possible implementation manners, the middle part of the second vibration assembly and the middle part of the first vibration assembly are opposite. The middle part of the second vibration assembly is fixed to the second base. The outer periphery of the second vibration assembly and the outer periphery of the first vibration assembly are opposite. The outer peripheries of the second vibration assembly and the first vibration assembly enclose the acoustic channel.

[0007] It can be understood that the acoustic channel enclosed by the outer peripheries of the second vibration assembly and the first vibration assembly can be annular. The acoustic channel can be arranged to surround the vibration space. This can make the length of the acoustic channel longer. When controlling the opening and closing of the acoustic channel at the second frequency, the adjustable range of the acoustic channel is larger.

[0008] In some possible implementation manners, a first through hole is provided in the middle of the second vibration assembly, and the middle of the first vibration assembly is disposed opposite to the second base.

[0009] It can be understood that a first through hole is provided in the middle of the second vibration assembly. On the one hand, without increasing the height of the sound generating device in the first direction, the height of the vibration space can be increased, and the risk that the middle of the first vibration assembly interferes with the second vibration assembly or the second base during vibration can be reduced, thereby reducing the risk of failure of the sound generating device. On the other hand, the volume of the second vibration assembly can be reduced, materials can be saved, and the cost of the sound generating device can be reduced.

[0010] In some possible implementation manners, the acoustic channel is annular.

[0011] It can be understood that, compared with the solution where the acoustic channel is located on one side of the vibration space, the acoustic channel is set to be annular and arranged around the vibration space, so that the length of the acoustic channel can be longer. When controlling the opening and closing of the acoustic channel at the second frequency, the adjustable range of the acoustic channel is larger.

[0012] In some possible implementation manners, the first base is fixedly connected to the second base, the second vibration assembly is fixed to one side of the second base and is spaced apart from the first base, the middle of the first vibration assembly is disposed opposite to the second base, and the acoustic channel is located on one side of the vibration space.

[0013] It can be understood 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 emitting direction of the sound generating device can be controlled. And when the sound generating device is fixed to the electronic device, either the first base or the second base can be fixedly connected to the electronic device to realize the fixation of the sound generating device. Compared with the solution where the first base and the second base are respectively installed on the electronic device, the risk of misalignment between the first vibration assembly and the second vibration assembly can be reduced, the assembly accuracy of the sound generating device is higher, and the installation difficulty of the sound generating device is smaller.

[0014] In some possible implementation manners, the acoustic channel is linear or arc-shaped.

[0015] It can be 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 generating device can be adjusted.

[0016] In some possible implementation manners, the number of the second vibration assemblies is multiple, and the multiple second vibration assemblies are spaced apart.

[0017] It can be understood that when the number of the second vibration components is multiple, the multiple second vibration components and the outer peripheral edge of the first vibration component can enclose multiple acoustic channels. By adjusting the positions of the second vibration components, the sound emission direction of the sound generating device can be adjusted.

[0018] In some possible implementation manners, the shape of the second vibration component is circular, annular, rectangular or arc-shaped.

[0019] It can be understood that the shape of the acoustic channel can be adjusted by adjusting the shape of the second vibration component. There can be various choices for the shape of the second vibration component, and the sound generating device can be applicable to various usage scenarios.

[0020] In some possible implementation manners, the second vibration component is a piezoelectric sheet, and the sound generating device further includes a second feeding circuit electrically connected to the second vibration component for transmitting an electrical signal to the second vibration component.

[0021] It can be understood that compared with the solution of adopting a traditional mechanical motion structure to realize the reciprocating motion of the outer peripheral edge of the second vibration component, the piezoelectric sheet has a smaller volume, which is beneficial to reducing the volume of the sound generating device.

[0022] In some possible implementation manners, the reciprocating motion is a reciprocating rotation or a reciprocating movement.

[0023] In some possible implementation manners, along a first direction, the distance between the first vibration component and the second vibration component is less than 1 mm, and the first direction is the direction in which the first vibration component faces the second vibration component.

[0024] It can be understood that the distance between the first vibration component and the second vibration component is small, the thickness of the sound generating device in the first direction is small, which is beneficial to the miniaturization of the sound generating 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 vibration is also small. When the sound generating device is installed in the internal space of an electronic device, during the sound generation process of the sound generating device, the risk of the first vibration component driving the housing and / or the keyboard of the electronic device to vibrate can be reduced, and the problem of airflow noise caused by large-amplitude vibration can also be reduced.

[0025] In some possible implementation manners, the middle part of the first vibration component vibrates at a first frequency to form a first sound wave, the outer peripheral edge of the second vibration component makes a reciprocating motion, 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 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.

[0026] It can be understood that the high-frequency first sound wave can be modulated by the acoustic channel to form an audible sound with a 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 the sound with the same frequency as the audible sound emitted by a traditional speaker, the sound pressure value of the sound generating device of the present application is higher when the frequencies of the audible sounds are the same. That is, the low-frequency acoustic performance of the sound generating device of the present application is better. In addition, compared with a traditional speaker generating a sound with the same sound pressure level, the vibration displacement of the first vibration structure of the sound generating device of the present application can be smaller than the vibration displacement of the diaphragm of the traditional speaker. This is beneficial to reducing the volume of the sound generating device. The sound generating device can have a high low-frequency sound pressure level in a small volume.

[0027] In some possible implementation manners, the difference between the first frequency and the resonance frequency of the first vibration component 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 is less than or equal to a threshold value. The threshold value is less than or equal to 500 Hz.

[0028] It can be understood that setting the first frequency to be close to or equal to the resonance frequency of the first vibration component can improve the vibration efficiency of the sound generating device. Setting the second frequency to be close to or equal to the resonance frequency of the second vibration component can 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 resonance frequencies of the first vibration component and the second vibration component meet the preset values.

[0029] In some possible implementation manners, 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.

[0030] It can be understood that by setting the first frequency f1 and the second frequency f2 as a single frequency or a frequency band range, the frequency band of the second sound wave can be adjusted to be a single frequency or a frequency band range.

[0031] In some possible implementation manners, 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|.

[0032] It can be understood that by setting the magnitudes of the first frequency f1 and the second frequency f2, one of the two frequencies of the sound included in the second sound wave is an audible sound, and the other can fall within the ultrasonic frequency range. When the sound generating device emits sound, the frequency within the ultrasonic range of the second sound wave will not be received by the user, and the user will only hear an audible sound, and the noise of the sound generating device is less.

[0033] In some possible implementation manners, the first frequency f1 and the second frequency f2 further satisfy: f1≥20kHz, f2≥20kHz.

[0034] It can be understood that by setting both the first frequency f1 and the second frequency f2 as ultrasonic frequencies, when the sound generating device generates sound, the first frequency f1 and the second frequency F2 will not be heard by the user, and there is less noise in the sound generating device. Moreover, by setting both the first frequency F1 and the second frequency f2 as ultrasonic, it can also ensure that the sound wave of |f1 + F2| in the second sound wave can fall within the ultrasonic frequency range, and the sound wave with the frequency |f1 + f2| in the space cannot be heard by the human ear. In addition, by setting both the first frequency f1 and the second frequency F2 as ultrasonic, the sound generating device can obtain a larger sound pressure value with a smaller vibration displacement. When the frequency of |F1 - f2| is audible, the sound pressure value of the second sound wave is larger, and the low-frequency performance of the sound generating device is better.

[0035] In a second aspect, an embodiment of the present application provides an electronic device. The electronic device includes a sound generating device, so that the volume of the sound generating device is small, which is beneficial to the miniaturization of the electronic device.

[0036] In some possible implementation manners, the electronic device may further include a housing, and the sound generating device is installed in the housing. Description of the Drawings

[0037] In order to illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.

[0038] Figure 1 It is a partial structural schematic diagram of the electronic device provided by the embodiment of the present application;

[0039] Figure 2 is Figure 1 An exploded schematic diagram of an implementation manner of the electronic device shown in

[0040] Figure 3 is Figure 1 A partial sectional view of an implementation manner of the electronic device shown in at the section line A - A;

[0041] Figure 4 is Figure 2 A structural schematic diagram of an implementation manner of the sound generating device shown in ;

[0042] Figure 5 is Figure 4 An exploded schematic diagram of an implementation manner of the sound generating device shown in ;

[0043] Figure 6 is Figure 4 A partial sectional view of an implementation manner of the sound generating device shown in at the section line B - B;

[0044] Figure 7 is Figure 4 A schematic structural view of the sound generating device shown in another angle;

[0045] Figure 8 is Figure 4 An exploded view of another embodiment of the sound generating device shown in

[0046] Figure 9 is Figure 4 A partial sectional view of another embodiment of the sound generating device shown in

[0047] Figure 10 A schematic structural view of another embodiment of the sound generating device provided by the embodiment of the present application in another angle;

[0048] Figure 11 is Figure 10 A partial sectional view of an embodiment of the sound generating device shown in

[0049] Figure 12a A schematic structural view of still another embodiment of the sound generating device provided by the embodiment of the present application in another angle;

[0050] Figure 12b A schematic structural view of still another embodiment of the sound generating device provided by the embodiment of the present application in another angle;

[0051] Figure 13 is Figure 1 A partial sectional view of another embodiment of the electronic device shown in Detailed implementation manners

[0052] Hereinafter, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means "or", for example, A / B may mean A or B; "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B may mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality of" means two or more than two.

[0053] Hereinafter, terms such as "first" and "second" are only used for descriptive purposes and cannot be construed as implying or suggesting relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0054] In the embodiments of the present application, the orientation terms mentioned, such as "upper", "lower", "inner", "outer", "side", "top", "bottom", etc., are only with reference to the direction of the attached drawings. Therefore, the orientation terms used are for better and clearer description and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0055] 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", "coupled", "disposed on" should be understood in a broad sense. For example, "connected" 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" means that they are connected to each other and the relative position relationship after connection remains unchanged. "Rotational connection" means that they are connected to each other and can rotate relative to each other after connection. "Sliding connection" means that they are connected to each other and can slide relative to each other after connection. Among them, "electrical connection" means that electrical signals can be conducted between each other.

[0056] In addition, in the embodiments of the present application, mathematical concepts such as parallelism are mentioned. These limitations are all in view of the current technological level, rather than absolute strict definitions in the mathematical sense. A small deviation is allowed, and approximate parallelism is acceptable. For example, A is parallel to B means that A is parallel to B or approximately parallel to B, and the included angle between A and B can be between 0 degrees and 10 degrees.

[0057] Figure 1 It is a partial structural schematic diagram of the electronic device 1 provided by the embodiments of the present application. Figure 2 is Figure 1 It is an exploded schematic diagram of an implementation manner of the electronic device 1 shown in

[0058] As Figure 1 shown, the electronic device 1 includes a sound generating 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 generating device 100. The smart wearable device can be a smart watch, an augmented reality (AR) glasses, an AR helmet, or a virtual reality (VR) glasses, etc. The electronic device 1 can also be a device such as an earphone, a player, etc. that can output audible sound. In addition, the sound generating device 100 can also be applied in fields such as the whole house, smart home, and automobile, and be used as an audio device or a part of an audio device. Figure 1 The electronic device 1 in the shown embodiment is described by taking a mobile phone as an example.

[0059] Since the sound generating device 100 is an internal component of the electronic device 1,Figure 1 The sound generating device 100 is schematically shown by a dashed line. It can be understood that Figure 1 and the related drawings below only schematically show some components included in the electronic device 1, and the actual shape, actual size, actual position, and actual structure of these components are not limited by Figure 1 and the respective drawings below. In addition, when the electronic device 1 is a device in some other forms, the electronic device 1 may not be provided with the screen 300.

[0060] Among them, the screen 300 is installed on the housing 200. The housing 200 and the screen 300 can form the outer shell of the electronic device 1. The screen 300 and the housing 200 can enclose the inner cavity of the electronic device 1. The sound generating device 100 can be installed in the inner cavity of the electronic device 1. The housing 200 has a sound outlet 201. The sound outlet 201 communicates 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 generating device 100 can be transmitted out 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 Figure 1 the cylindrical hole shown. The shape of the sound outlet 201 can also be a special-shaped hole. The sound outlet 201 is not limited to Figure 1 the five shown.

[0061] Exemplarily, the housing 200 may include a rear cover 210 and a middle frame 220. The screen 300 and the rear cover 210 are respectively connected to both sides of the middle frame 220. The screen 300 and the middle frame 220 can enclose the first inner cavity 2 of the electronic device 1, and the rear cover 210 and the middle frame 220 can enclose the second inner cavity 3 of the electronic device 1. The internal components of the electronic device 1 can be arranged in the first inner cavity 2 or the second inner cavity 3 according to requirements. Exemplarily, the sound generating device 100 can be arranged in the second inner cavity 3.

[0062] Figure 3 is Figure 1 a partial cross-sectional view of an embodiment of the electronic device 1 shown in Figure 4 is Figure 2 a schematic structural view of an embodiment of the sound generating device 100 shown in

[0063] As Figure 3 and Figure 4As shown, the sound generating device 100 may include a first transducer 10 and a second transducer 20. Among them, 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. It should be noted that the relative arrangement of the first vibration assembly 12 and the second vibration assembly 22 means that their projections on the reference plane in the first direction at least partially overlap. The first direction is the direction in which the first vibration assembly 12 faces the second vibration assembly 22, and the reference plane is perpendicular to the first direction.

[0064] The first base 11 can be used to fix the first vibration assembly 12. The second base 21 can be used to fix the second vibration assembly 22. Exemplarily, when the first sound generating 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 rear cover 210, and the first vibration assembly 12 can be fixed to the rear 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 assembly 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 rear cover 210.

[0065] In other embodiments, the sound generating device 100 can also be disposed in the first inner cavity 2. Exemplarily, the first base 11 of the first transducer 10 can be fixedly connected to the screen 300, and the second base 21 of the second transducer 20 can be fixedly connected to the middle frame 220. 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 screen 300.

[0066] Figure 5 is Figure 4 An exploded view of an embodiment of the sound generating device 100 shown in Figure 6 is Figure 4 A partial sectional view of an embodiment of the sound generating device 100 shown in Figure 7 is Figure 4 A schematic structural view of the sound generating device 100 shown in Figure 6 In Figure 7 the vibration space 101 and the acoustic channel 102 are schematically shown by a dashed box.

[0067] AsFigure 5 , Figure 6 and Figure 7 As shown in Figure 5 , Figure 6 and Figure 7 , the middle part 123 of the first vibration assembly 12 and the second transducer 20 can enclose a vibration space 101 (the vibration space 101 is schematically shown by a dotted line box in Figure 6 ). The middle part 123 of the first vibration assembly 12 can vibrate at a first frequency to form a first sound wave. The frequency of the first sound wave can be equal to the first frequency. Figure 6 The middle part 123 of the first vibration assembly 12 can vibrate at a first frequency to form a first sound wave. The frequency of the first sound wave can be equal to the first frequency.

[0068] Exemplarily, the first vibration assembly 12 can include a diaphragm 121 and a first vibration structure 122. The first vibration structure 122 can be fixedly connected to the middle part of the diaphragm 121 (the middle part of the diaphragm 121 is schematically shown by a dotted line in Figure 6 ). The middle part of the diaphragm 121 and the first vibration structure 122 can constitute the middle part 123 of the first vibration assembly 12. The first vibration structure 122 can be used to drive the middle part of the diaphragm 121 to vibrate at the first frequency, push the air in the vibration space 101 to vibrate, and form a first sound wave. The outer peripheral edge of the diaphragm 121 can be fixed to the first base 11. The outer peripheral edge of the diaphragm 121 can constitute the outer peripheral edge 124 of the first vibration assembly 12. It should be noted that the middle part refers to between two points. In Figure 6 , the middle part 123 of the first vibration assembly 12 is located between the outer peripheral edges 124 on both sides. Figure 6 The middle part of the diaphragm 121 and the first vibration structure 122 can constitute the middle part 123 of the first vibration assembly 12. The first vibration structure 122 can be used to drive the middle part of the diaphragm 121 to vibrate at the first frequency, push the air in the vibration space 101 to vibrate, and form a first sound wave. The outer peripheral edge of the diaphragm 121 can be fixed to the first base 11. The outer peripheral edge of the diaphragm 121 can constitute the outer peripheral edge 124 of the first vibration assembly 12. It should be noted that the middle part refers to between two points. In Figure 6 , the middle part 123 of the first vibration assembly 12 is located between the outer peripheral edges 124 on both sides. Figure 6 In Figure 6 , the middle part 123 of the first vibration assembly 12 is located between the outer peripheral edges 124 on both sides.

[0069] In some embodiments, the middle part 123 of the first vibration assembly 12 can vibrate in a first direction. The first direction is the direction in which the first vibration assembly 12 faces the second vibration assembly 22. In other embodiments, the vibration direction of the middle part 123 of the first vibration assembly 12 can also be set at an angle to the first direction.

[0070] Exemplarily, the first vibration structure 122 can be fixedly connected to the surface of the diaphragm 121 away from the second vibration assembly 22. The first base 11 can be fixed to the surface of the diaphragm 121 away from the second vibration assembly 22. In other embodiments, the first vibration structure 122 can be fixedly connected to the surface of the diaphragm 121 close to the second vibration assembly 22.

[0071] As Figure 5 shown, the first base 11 can be annular. The first vibration structure 122 can be located inside the ring of the first base 11. In this way, the connection area between the outer peripheral edge of the diaphragm 121 and the first base 11 is relatively large. In addition, the first base 11 can be annular, and the outer peripheral edge of the diaphragm 121 is fixedly connected to the first base 11. During the vibration process, the force on the diaphragm 121 is relatively average, avoiding the left - right shaking of the diaphragm 121.

[0072] In some embodiments, the first vibration structure 122 may adopt a piezoelectric sheet structure. The sound generating device 100 may further include a first power feeding circuit (not shown in the figure). The first power feeding circuit is electrically connected to the first vibration structure 122 and is configured 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 piezoelectric materials such as lead zirconate titanate piezoelectric ceramics (abbreviated as PZT). By transmitting an electrical signal to the first vibration structure 122, the first vibration structure 122 can vibrate at a first frequency, and then the middle part of the diaphragm 121 can be driven to vibrate at the first frequency. It can be understood that by adjusting the electrical signal transmitted to the first vibration structure 122, the vibration frequency of the first vibration structure 122 can be changed. Those skilled in the art can set the range of the first frequency according to requirements.

[0073] It can be understood that the first vibration structure 122 adopts a piezoelectric sheet structure. Compared with the solution of using a magnetic circuit system to realize the vibration of the diaphragm 121 in a traditional loudspeaker, the volume of the piezoelectric sheet is smaller, which is beneficial to reducing the volume of the sound generating device 100.

[0074] It can be understood that the piezoelectric sheet is only one embodiment for the first vibration component 12 to achieve vibration. In other embodiments, the first vibration structure 122 may also adopt a mechanical vibration structure to realize the vibration of the diaphragm 121. The present application does not specifically limit the way for the first vibration component 12 to achieve vibration.

[0075] In some embodiments, the diaphragm 121 may be made of a metal material. In this way, the strength of the diaphragm 121 is relatively good.

[0076] In some embodiments, 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. It should be noted that the difference between the first frequency and the resonance frequency of the first vibration component 12 is an absolute value. The difference between the first frequency f1 and the resonance frequency f3 of the first vibration component 12 is |f1 - f3|. In other words, the first frequency f1 may be greater than or equal to the resonance frequency f3 of the first vibration component 12, or may be less than or equal to the resonance frequency f3 of the first vibration component 12.

[0077] In some embodiments, the threshold may be less than or equal to 500 Hz. For example, the threshold may be 500 Hz, and the first frequency f1 and the resonance frequency f3 of the first vibration component 12 satisfy: |f1 - f3| ≤ 500 Hz. In other embodiments, the threshold may also be 20 Hz, 100 Hz, 200 Hz, etc. It can be understood that setting the first frequency close to or equal to the resonance 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 resonance frequency of the first vibration component 12 conforms to a preset value.

[0078] As Figure 6 and Figure 7 shown, the second vibration component 22 and the outer peripheral edge 124 of the first vibration component 12 can enclose an acoustic channel 102 ( Figure 6 the acoustic channel 102 is schematically shown by a dashed box in Figure 3 ). The vibration space 101 is communicated with 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 generating device 100. For example, when the sound generating device 100 is disposed inside the electronic device 1, the outside can refer to the internal space of the electronic device 1 (such as Figure 3 the second inner cavity 3 shown in

[0079] ). When the sound generating device 100 is exposed to the electronic device 1, the external space can be the external environment where the sound generating device 100 or the electronic device 1 is located. The communication can be direct communication or indirect communication. The outer peripheral edge 124 of the first vibration component 12 refers to the peripheral part of the first vibration component 12 close to the external space.

[0080] It can be understood that the sound generating device 100 of the present application adopts a sound generating method different from that of traditional speakers. On the one hand, by setting the middle part of the first vibration structure 122 to vibrate at a first frequency to form a first sound wave. On the other hand, the outer peripheral edge 223 of the second vibration assembly 22 and the first vibration structure 122 enclose an acoustic channel 102. The second vibration assembly 22 reciprocates relative to the outer peripheral edge of the first vibration assembly 12, so that the acoustic channel 102 opens and closes at a second frequency. In this way, 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, playing the role of "one thing with two uses". The sound generating device 100 of the present application does not need to additionally set up a structure to form the acoustic channel 102, and the volume of the sound generating device 100 can be reduced. Compared with traditional speakers, the sound generating device 100 of the present application has a simpler structure, lower processing and assembly difficulty.

[0081] In some embodiments, the second sound wave may include audible sound, and the first frequency may be greater than the frequency of the audible sound in the second sound wave. It can be understood that the high-frequency first sound wave can be modulated by the acoustic channel 102 to form audible sound with a lower frequency, and the sound pressure value of the audible sound may be equal to or close to the sound pressure value of the first sound wave. Compared with the sound pressure value of the sound with the same frequency as the audible sound emitted by traditional speakers, the sound generating device 100 of the present application has a higher sound pressure value when the frequencies of the audible sounds are the same. That is, the low-frequency acoustic performance of the sound generating device 100 of the present application is better.

[0082] The following will be combined with Figure 6 Specifically introduce an implementation manner of the opening and closing of the acoustic channel 102.

[0083] Please refer to again Figure 6, the opening and closing of the acoustic channel 102 includes two motions: the opening of the acoustic channel 102 and the closing of the acoustic channel 102. Both of these motions are a process, rather than just referring to an instantaneous state. The outer peripheral edge 223 of the second vibration assembly 22 makes a reciprocating motion, and the outer peripheral edge 223 of the second vibration assembly 22 approaches or moves away from the outer peripheral edge 124 of the first vibration assembly 12, so that the acoustic channel 102 continuously repeats the opening process and the closing process. Among them, when the sound generating device 100 is not working, the distance between the outer peripheral edge 223 of the second vibration assembly 22 and the outer peripheral edge 124 of the first vibration assembly 12 is d0. During the closing process of the acoustic channel 102, the outer peripheral edge 223 of the second vibration assembly 22 approaches the outer peripheral edge 124 of the first vibration assembly 12, and the distance between the outer peripheral edge 223 of the second vibration assembly 22 and the outer peripheral edge 124 of the first vibration assembly 12 gradually decreases. The distance between the outer peripheral edge 223 of the second vibration assembly 22 and the outer peripheral edge 124 of the first vibration assembly 12 reaches a preset minimum value (for the convenience of description, the minimum value will be denoted as 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 peripheral edge 223 of the second vibration assembly 22 gradually moves away from the outer peripheral edge 124 of the first vibration assembly 12, and the distance between the outer peripheral edge 223 of the second vibration assembly 22 and the outer peripheral edge 124 of the first vibration assembly 12 gradually increases. When the distance between the outer peripheral edge 223 of the second vibration assembly 22 and the outer peripheral edge 124 of the first vibration assembly 12 reaches a preset maximum value (for the convenience of description, the maximum value will be denoted as d2 below).

[0084] Exemplarily, the surface of the first vibration assembly 12 facing the second vibration assembly 22 is the first surface 125. The surface of the second vibration assembly 22 facing the first vibration assembly 12 is the second surface 221. The distance between the outer peripheral edge 223 of the second vibration assembly 22 and the outer peripheral edge 124 of the first vibration assembly 12 can be the distance from the outer periphery 2211 of the second surface 221 along the first direction to the first surface 125. It should be noted that during the reciprocating motion of the outer peripheral edge 223 of the second vibration assembly 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 distances 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.

[0085] During the reciprocating motion of the outer peripheral edge 223 of the second vibration assembly 22, along the first direction, the real-time distance from the outer periphery 2211 of the second surface 221 to the first surface 125 is dt, and d1 ≤ dt ≤ d2. The acoustic channel 102 opening and closing at the second frequency can be understood as the main change frequency of dt being the second frequency.

[0086] In some embodiments, d1 may be 0 mm. It should be noted that, due to process limitations, during the manufacturing and assembly process of the sound-generating device 100, d1 may be a value infinitely close to 0, for example, d1 ≤ 0.06 mm. At this time, the vibration space 101 is not connected to the external space. The acoustic channel 102 has a 100% blocking effect on the first sound wave, and the first sound wave cannot be transmitted to the external space.

[0087] When the sound-generating device 100 is not working, 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 limit this. Figure 6 The second vibration component 22 shown has d1<d0<d2. The size of d2 is not limited in this application and can be designed according to requirements.

[0088] Figure 5 The dotted lines illustrate 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) when the second vibration component 22 is stationary.

[0089] 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 also be arranged at an angle to the second surface 221.

[0090] It is understandable that the reciprocating motion of the outer periphery 223 of the second vibration component 22, approaching or moving away from the outer periphery 124 of the first vibration component 12, is a relative concept. When the outer periphery 223 of the second vibration component 22 reciprocates, the outer periphery 124 of the first vibration component 12 can be fixed or vibrating.

[0091] The first vibration component vibrates at a first frequency f1 to form a first sound wave, which radiates outward along the acoustic channel 102. The acoustic channel 102 opens and closes at a second frequency f2 under the cooperation of the second vibration component 22 and the first vibration component 12, thereby changing the radiation state of the first sound wave, so that the first sound wave is modulated to generate a second sound wave. The frequency of the second sound wave may include |f1+f2| and |f1-f2|.

[0092] Among them, the sound wave of the frequency |f1+f2| can be an audible sound or an ultrasound. The sound wave of the frequency |f1-f2| can be an audible sound or an ultrasound. The frequency of the second sound wave can be controlled by setting the magnitude of the first frequency f1 and the second frequency f2. Exemplarily, the first frequency f1 is set to 21kHz, and the second frequency f2 is set to 20.5kHz. In this way, |f1+f2|=41.5kHz, which is ultrasound; |f1-f2|=500kHz, which is audible sound. The second sound wave can include two frequencies of 41.5kHz and 500Hz, and the sound-generating device 100 can emit an ultrasound and an audible sound. Exemplarily, the first frequency f1 is set to 500Hz, and the second frequency f2 is set to 550Hz. In this way, |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.

[0093] The first frequency f1 can be a single frequency or a frequency band range. The second frequency f2 can be a single frequency or a frequency band range. It is understandable that the two frequency bands |f1+f2| and |f1-f2| included in the second sound wave can be adjusted to be single frequency or frequency band range by setting the first frequency f1 and the second frequency f2 to be single frequency or frequency band range. 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 range. The range of |f1+f2| is in the range of 42.02Hz to 43kHz, which is a frequency band range.

[0094] In some embodiments, when |f1-f2| is a frequency band range, the range of |f1-f2| may be partially audible sound. For example, the range of |f1-f2| may be in the range of 20 Hz to 25 kHz. The range of |f1-f2| may also be entirely audible sound. For example, the range of |f1-f2| may be in the range of 100 Hz to 500 Hz.

[0095] In some embodiments, the first frequency f1 and the second frequency f2 satisfy: 20 Hz ≤ | f1-f2 | ≤ 20 kHz, 20 kHz ≤ | f1+F2 |. It is understandable that by setting the magnitude of the first frequency F1 and the second frequency f2, the second sound wave includes two frequencies of sound, one of which is an audible sound and the other can fall within the frequency range of ultrasonic waves. When the sound-generating device 100 generates sound, the frequency of the second sound wave within the ultrasonic range will not be received by the user, and the user will only hear an audible sound, and the sound-generating device 100 has less noise.

[0096] In some embodiments, the first frequency f1 and the second frequency f2 also satisfy: f1 ≥ 20kHz, f2 ≥ 20kHz. It can be understood that when the first frequency F1 and the second frequency F2 are both set to ultrasonic frequencies, the first frequency F1 and the second frequency f2 will not be heard by the user when the sound-emitting device 100 emits sound, and the sound-emitting device 100 has less noise. In addition, when the first frequency f1 and the second frequency f2 are both set 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 the frequency |f1+f2| in the space can not be heard by the human ear. In addition, when the first frequency f1 and the second frequency f2 are both set to ultrasonic frequencies, the sound-emitting device 100 can obtain a larger sound pressure value under a smaller vibration displacement. When the frequency |f1-f2| is an audible sound, the sound pressure value of the second sound wave is larger, and the low-frequency performance of the sound-emitting device 100 is better.

[0097] Several implementations of the second vibration component 22 and the outer periphery 124 of the first vibration component 12 enclosing the acoustic channel 102 are described in detail below with reference to the accompanying drawings.

[0098] like Figure 6 As shown, the second vibration component 22 can be an integrated 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 and the outer periphery 124 of the first vibration component 12 can enclose the acoustic channel 102. Figure 6 In the embodiment, the middle portion 222 of the second vibration component 22 is located between the outer peripheral edges 223 on both sides.

[0099] 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 later through specific embodiments and will not be repeated here.

[0100] The acoustic channel 102 may be annular. The acoustic channel 102 may be arranged around the vibration space 101. It is understood that, compared with the solution in which the acoustic channel 102 is located on one side of the vibration space 101, the acoustic channel 102 is arranged in an annular shape and arranged around the vibration space 101, so that the length of the acoustic channel 102 can be longer. When the acoustic channel 102 is controlled to open and close at the second frequency, the adjustable range of the acoustic channel 102 is larger.

[0101] In some embodiments, the second vibration component 22 can be a piezoelectric sheet. The sound-generating 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 powered on, it starts 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 is stationary, and the outer periphery 223 of the second vibration component 22 reciprocates.

[0102] It is understandable 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.

[0103] It is understandable 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.

[0104] In other embodiments, the second vibration component 22 may also be a sheet structure or a plate structure. The sound-generating device 100 may also include a second vibration structure (not shown). The second vibration structure may be a mechanical motion structure, which is used to drive the second vibration component 22 to reciprocate 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 understandable that the present application does not specifically limit the vibration mode of the second vibration component.

[0105] In some embodiments, the reciprocating motion may be reciprocating rotation or reciprocating movement. Figure 6 The outer periphery 223 of the second vibration assembly 22 is shown to reciprocate.

[0106] In some embodiments, the difference between the second frequency and the resonant frequency of the second vibration component 22 may be less than or equal to the 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 |f2-f4|. In other words, the second frequency f2 may be greater than or equal to the resonant frequency f4 of the second vibration component 22, or may be less than or equal to the resonant frequency f4 of the second vibration component 22.

[0107] 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: |f2-f4|≤500 Hz. In other embodiments, the threshold value may also be 20 Hz, 100 Hz, 200 Hz, etc. It is understood 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.

[0108] 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. Exemplarily, the resonant frequency of the second vibration component 22 is designed to be 23kHz, so as to be suitable for the sound-generating device 100 that needs to form audible sounds of medium and low frequencies. The second vibration component 22 is illustrated by using a disc-shaped structure. The second vibration component 22 includes a piezoelectric sheet and a metal sheet, and the size of the piezoelectric sheet is the same as that of the metal sheet. The piezoelectric sheet can be pressed onto the metal sheet through a glue 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 about 23kHz, the piezoelectric sheet selects PZT 5H material, the size is a radius of 3.56mm, the thickness is 0.2mm, the metal sheet selects a nickel-based alloy material, the size is a radius of 3.56mm, the thickness is 0.2mm, and 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.

[0109] 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 driving 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.

[0110] 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.

[0111] In some embodiments, the same technical contents as those of the sound-emitting device 100 in the previous embodiments are not repeated. Figure 8 yes Figure 4 FIG. 2 is an exploded schematic diagram of another embodiment of the sound-generating device 100 shown in FIG. Figure 9 yes Figure 4 FIG. 1 is a partial cross-sectional view of another embodiment of the sound generating device 100 at the section line BB.

[0112] like Figure 8 and Figure 9 As shown, the middle portion 222 of the second vibration component 22 may be provided with a first through hole 211. At this time, the second vibration component 22 may be annular as a whole (eg 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.

[0113] 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.

[0114] In some embodiments, the second base 21 is fixedly connected to a side surface of the second vibration component 22 away from the first vibration component 12. In other embodiments, the second base 21 may also be fixedly connected to the inner wall surface of the first through hole 211.

[0115] 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.

[0116] It is understood that the profile of the outer side of the second vibration component 22 can be as follows: Figure 8 The first through hole 211 may be a circle as shown, or a rectangle, a triangle or other irregular shapes. Figure 8 The circle shown may also be a rectangle, a triangle or other irregular shapes, which is not limited in the present application.

[0117] In some embodiments, the same technical contents as those of the sound-emitting device 100 in the previous embodiments are not repeated. Figure 10 It is a schematic structural diagram of another implementation of the sound-emitting device 100 provided in an embodiment of the present application at another angle. Figure 11 yes Figure 10 A partial cross-sectional view of an embodiment of the sound generating device 100 shown in FIG. 1 at the section line CC.

[0118] like Figure 10 and Figure 11 As shown, 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 the outer periphery 124 of a part of the first vibration component 12 surround the acoustic channel 102. The middle part 123 of the first vibration component 12 can be arranged opposite to the second base 21 to surround the vibration space 101. At this time, the acoustic channel 102 can be located on one side of the vibration space 101.

[0119] It is understandable 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 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.

[0120] Furthermore, when the sound-generating device 100 is fixed to the electronic device 1, the first base 11 and the second base 21 can be fixedly connected to the electronic device 1 to achieve the fixation of the sound-generating device 100. Compared with the solution in which the first base 11 and the second base 21 are respectively installed on the electronic device 1, the risk of misalignment of the first vibration component 12 and the second vibration component 22 can be reduced, the assembly accuracy of the sound-generating device 100 is higher, and the installation difficulty of the sound-generating device 100 is lower.

[0121] 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 shell of the sound-generating device 100, and 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, and the sound-generating device 100 can be used and sold as a separate product.

[0122] Exemplarily, the second base 21 may include a first portion 212 and a second portion 213 ( Figure 10 and Figure 11 21 and 213 are schematically distinguished by a dotted line. The first part 212 can be arranged opposite to the first vibration component 12. The second vibration component 22 can be fixed to one side of the second base 21. The second part 213 is connected to one side of the first part 212 and is spaced apart from the second vibration component 22. Exemplarily, the second base 21 can be fixedly connected to the first base 11 by gluing.

[0123] Figure 12a It is a structural schematic diagram of another implementation manner of the sound-emitting device provided in an embodiment of the present application at another angle.

[0124] The number of the second vibration components 22 may be one or more. Figure 10 As shown, the number of the second vibration component 22 can be one, and one second vibration component 22 is fixedly connected to one side of the second base 21. Figure 12a As shown, there can be multiple second vibration components 22, and the multiple second vibration components 22 are arranged at intervals. It can be understood that by adjusting the position of the second vibration component 22, the sound emitting direction of the sound generating device 100 can be adjusted.

[0125] In some embodiments, when there are multiple second vibration components 22, the multiple second vibration components 22 and the outer periphery 124 of the first vibration component 12 can surround multiple acoustic channels 102, and the multiple acoustic channels 102 can be arranged at intervals (such as Figure 12a As shown, Figure 12a The acoustic channel 102 is illustrated by a filling pattern).

[0126] Figure 12b It is a structural schematic diagram of another implementation manner of the sound-emitting device provided in an embodiment of the present application at another angle.

[0127] In some embodiments, the first vibration component 12 may be rectangular, circular, or other polygonal. The second vibration component 22 may be rectangular (eg, Figure 10 and Figure 12a As shown), arc (as Figure 12b The shape of the second vibration component can be selected in many ways, and this application does not limit it.

[0128] 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, Figure 10 and Figure 12a The acoustic channel 102 shown in FIG. is a straight line ( Figure 10 and Figure 12a The acoustic channel 102 is illustrated by a filling pattern). Figure 12b The acoustic channel 102 shown in FIG. is arc-shaped ( Figure 12b 102 is indicated by a filling pattern). It is 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 of the sound emitted by the sound-emitting device can be adjusted. For example, when the acoustic channel 102 is an arc, 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.

[0129] 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 the present application does not impose any limitation thereto.

[0130] In some embodiments, the same technical contents as those of the sound-emitting device 100 in the previous embodiments are not repeated. Figure 13 yes Figure 1 FIG. 4 is a partial cross-sectional view of another embodiment of the electronic device 1 shown in FIG. 1 at the section line AA.

[0131] like Figure 13 As shown, the electronic device 1 includes a sound-emitting device 100, a housing 200 and a screen 300. The housing 200 is an integral structural member. The screen 300 is mounted on the housing 200. The screen 300 and the housing 200 can enclose an 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 constitute the outer shell of the electronic device 1.

[0132] Exemplarily, 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, the periphery of the first vibration component 12 is fixed to the first base 11, and the second transducer 20 includes a second base 21 and a second vibration component 22, and the second vibration component 22 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.

[0133] 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 .

[0134] 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, and can also 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 realize audible sounds of medium and low frequencies, and the piezoelectric speakers, dynamic speakers and other speakers can realize audible sounds of high frequencies.

[0135] 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 protection scope of the present application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

[0136] It is understood that all the above drawings are exemplary illustrations of the present application and do not represent the actual size of the product. Moreover, the size ratio relationship between the components in the drawings is not intended to limit the actual product of the present application.

[0137] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope 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, characterized in that, The middle part of the second vibration assembly (22) is arranged opposite to the middle part (123) of the first vibration assembly (12). 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) is arranged opposite to the outer peripheral edge (124) of the first vibration assembly (12). 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) is arranged opposite to the second base (21).

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, characterized in that, 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) is arranged opposite to the second base (21). 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 reciprocating rotation or 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). 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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