Sound device

Abstract

The present application discloses a sound-generating device, which relates to the technical field of wearable devices. The sound-generating device includes a housing, a sound-generating unit and an adjustment component, wherein the housing has a receiving space, the sound-generating unit is received in the receiving space, the sound-generating unit divides the receiving space into a front cavity and a rear cavity, the sound-generating unit and at least one of the housing has a connecting hole, and the connecting hole is connected to the front cavity; the adjustment component includes a diaphragm and a piezoelectric driver, the diaphragm is arranged at the connecting hole, the piezoelectric driver is stacked on the diaphragm along the thickness direction of the diaphragm, the piezoelectric driver is used to drive the diaphragm to deform, when the diaphragm is in a first state, the connecting hole is closed, and when the diaphragm is in a second state, the connecting hole is conductive.

Description

Technical Field

[0001] The present application belongs to the technical field of electroacoustic conversion, and specifically relates to a sound-generating device. Background Art

[0002] In the related art, earphones have an appearance that matches the structure of the ear canal to achieve physical noise reduction, reduce the impact of external ambient sound, and improve the sound quality effect felt by the user. However, when the user wears the earphones, the vibration of the diaphragm of the earphones will cause the air in the ear canal to be compressed, which increases the air pressure in the ear canal and causes some users to feel uncomfortable. In order to reduce this discomfort, a connecting hole is provided in the earphone, and the front cavity and the external space are connected or the front cavity and the rear cavity are connected through the connecting hole to balance the air pressure in the ear canal. However, keeping the connecting hole in the normally open state will reduce the passive noise reduction effect of the earphones, reduce the low-frequency sound effect of the earphones, etc., resulting in poor sound quality of the earphones. Summary of the invention

[0003] The present application aims to provide a sound-generating device, which at least solves the technical problem that the normally open connecting holes in the sound-generating device reduce the sound quality of the sound-generating device.

[0004] In order to solve the above technical problems, this application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a sound-generating device, comprising:

[0006] A housing having a receiving space;

[0007] A sound-generating unit is contained in the containing space, the sound-generating unit divides the containing space into a front cavity and a rear cavity, at least one of the sound-generating unit and the housing has a communication hole, and the communication hole is connected to the front cavity;

[0008] The regulating component includes a diaphragm and a piezoelectric driver. The diaphragm is arranged at the communicating hole. The piezoelectric driver is stacked on the diaphragm along the thickness direction of the diaphragm. The piezoelectric driver is used to drive the diaphragm to deform.

[0009] When the diaphragm is in the first state, the communication hole is closed, and when the diaphragm is in the second state, the communication hole is open.

[0010] In an embodiment of the present application, an adjustment component is provided so that the connecting hole can be closed by a diaphragm in a first state or the connecting hole can be connected by a diaphragm in a second state as needed. When the connecting hole provided in the sound-emitting unit is connected, the front cavity and the rear cavity can balance the air pressure through the connecting hole, thereby improving the low-frequency sound effect of the sound-emitting device. When the connecting hole provided in the sound-emitting unit is closed, the front cavity and the rear cavity are not connected through the connecting hole, thereby reducing the low-frequency sound effect of the sound-emitting device. When the connecting hole provided in the outer shell is connected, the front cavity and the external space can balance the air pressure through the connecting hole, thereby reducing the excessive pressure in the user's ear canal caused by the vibration of the diaphragm. When the connecting hole provided in the sound-emitting unit is closed, the connecting hole does not connect the front cavity and the external space, thereby improving the physical noise reduction effect of the sound-emitting device. The sound-emitting device provided by the present application can adjust the conduction or closure of the connecting hole according to the requirements of the scene to improve the sound quality of the sound-emitting device.

[0011] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0013] Figure 1 is a schematic diagram of the disassembled structure of an embodiment of a sound-generating device according to the present application;

[0014] Figure 2 is a schematic structural diagram of an embodiment of a sound-generating device according to the present application;

[0015] Figure 3 is a schematic cross-sectional structural diagram of an embodiment of an adjustment component in a first state according to the present application;

[0016] Figure 4 is a schematic structural diagram of an embodiment of a sound-emitting unit according to the present application;

[0017] Figure 5 is a schematic diagram of a three-dimensional structure of an embodiment of a sound-generating device according to the present application;

[0018] Figure 6 is a partial three-dimensional structural schematic diagram of an embodiment of a sound-generating device according to the present application;

[0019] Figure 7 is a partial three-dimensional structural schematic diagram of an embodiment of a sound-generating device according to the present application;

[0020] Figure 8 : is a schematic cross-sectional structure diagram of an embodiment of the adjustment component of the present application in the second state:

[0021] Fig. 9 is a schematic cross-sectional structural diagram of an embodiment of an adjustment component in a first state according to the present application;

[0022] Fig.10 is a schematic cross-sectional structural diagram of an embodiment of the adjustment component in the second state according to the present application;

[0023] Fig.11 is a schematic cross-sectional structural diagram of an embodiment of the adjustment component in the second state according to the present application;

[0024] Fig.12 is a schematic cross-sectional structural diagram of an embodiment of the adjustment component in the second state according to the present application;

[0025] Fig.13 is a schematic cross-sectional structural diagram of an embodiment of an adjustment component in a first state according to the present application;

[0026] Fig.14 It is a schematic cross-sectional structure diagram of an embodiment of the regulating assembly according to the present application. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0028] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] Combine the following Figures 1 to 3 A sound generating device 100 according to an embodiment of the present application is described.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present application provides a sound device 100, which includes a housing 1, a sound unit 2 and an adjustment component 3. The housing 1 has a receiving space, and the sound unit 2 is received in the receiving space. The sound unit 2 divides the receiving space into a front cavity 20 and a rear cavity 30. The sound unit 2 and at least one of the housing 1 have a connecting hole 40, and the connecting hole 20 is connected to the front cavity 20; the adjustment component 3 includes a diaphragm 31 and a piezoelectric driver 32, the diaphragm 31 is arranged at the connecting hole 40, the piezoelectric driver 32 is arranged on the diaphragm 31, and the piezoelectric driver 32 is used to drive the diaphragm 31 to deform. When the diaphragm 31 is in a first state, the connecting hole 40 is closed; when the diaphragm 31 is in a second state, the connecting hole 40 is conductive.

[0033] The sound-generating device 100 may specifically be an earphone in the form of an in-ear earphone, an earbud earphone, or the like. The housing 1 may include a front housing 11 and a rear housing 12, which cover each other to form a receiving space. The sound-generating unit 2 is the only or main electroacoustic conversion component in the sound-generating device 100, that is, the sound-generating unit 2 is a transducer device that can convert an electrical signal into an acoustic signal. The sound-generating unit 2 provided in the present application may be a dynamic sound-generating unit, a capacitive sound-generating unit, an electromagnetic sound-generating unit, or a piezoelectric sound-generating unit, and the like, and those skilled in the art may select the sound-generating unit according to their needs. Optionally, the sound-generating unit 2 is a dynamic sound-generating unit, and the sound-generating unit 2 includes a magnetic circuit system with a magnetic gap, a voice coil inserted into the magnetic gap, and a diaphragm fixed on the voice coil. Under the action of the magnetic field generated by the magnetic circuit system, the voice coil vibrates after being energized, thereby driving the diaphragm to vibrate and produce sound.

[0034] The sound unit 2 is accommodated in the receiving space of the shell and the receiving space is divided into a front cavity 20 and a rear cavity 30. The front cavity 20 is the space on the side of the diaphragm away from the voice coil, which can be the space surrounded by the front shell 11 and the sound unit 2. The rear cavity 30 is the space on the side of the diaphragm close to the voice coil, which can be the space surrounded by the rear shell 12 and the sound unit 2. In order to ensure that the sound generated by the sound unit 2 can be smoothly transmitted to the outside, one or more sound outlet holes 60 connected to the front cavity 20 are also opened on the shell 1. When the user uses the sound device 100, at least one sound outlet hole 60 connects the ear canal and the front cavity 20, so that the sound generated by the sound unit 2 can be transmitted to the user's eardrum through the front cavity 20 and the ear canal.

[0035] The outer edge of the diaphragm 31 of the adjustment component 3 can be connected to the housing 1 or the sound unit 2 to realize that the diaphragm 31 is set at the connecting hole 40. Of course, the diaphragm 31 can also be set on a bracket, and the bracket can be connected to the housing or the sound unit 2, and the diaphragm 31 is set at the connecting hole 40 through the bracket support.

[0036] Please refer to Figure 4 In the case where a connecting hole 40 is provided on the sound unit 2, the connecting hole 40 can be provided on the basin frame of the sound unit 2 or on other connecting parts connected to the basin frame. The connecting hole 40 can connect the front cavity 20 and the rear cavity 30. The front cavity 20 and the rear cavity 30 can balance the air pressure through the connecting hole 40. The connecting hole 40 can also adjust the frequency response, so that the sound waves in the front cavity 20 can interact with the sound waves in the rear cavity 30 through the connecting hole 40, thereby improving the low-frequency sound effect of the sound device 100. The diaphragm 31 can be arranged on the side of the sound unit 2 close to the front cavity 20, or on the side of the sound unit 2 close to the rear cavity 30. Of course, when the connecting hole 40 has a sufficient depth, the diaphragm 31 can also be arranged in the connecting hole 40.

[0037] See also Figure 5 , Figure 6 and Figure 7 In the case where a connecting hole 40 is provided on the shell 1 forming the front cavity 20, the connecting hole 40 can penetrate the shell 1, and the connecting hole 40 can connect the front cavity 20 with the external space. The connecting hole 40 can be used as a front air leakage hole to balance the air pressure in the front cavity 20. Similarly, the diaphragm 31 can be arranged on the side of the shell 1 close to the front cavity 20, or on the side of the shell 1 close to the rear cavity 30. Of course, when the connecting hole 40 has a sufficient depth, the diaphragm 31 can also be arranged in the connecting hole 40. For example, Figure 7 In the illustrated embodiment, the diaphragm 31 is attached to the inner side of the housing 1 and can close the communication hole 40 .

[0038] The communicating hole 40 may be provided on both the sound-emitting unit 2 and the housing 1 forming the front cavity 20 , or may be provided on one of them. Those skilled in the art may make the choice according to specific needs.

[0039] Please refer to Figure 8 The diaphragm 31 can be made of a material with a certain deformation ability, such as engineering plastics (such as PEEK, PAR, etc.), elastomeric materials (such as TPU, TPEE, silicone rubber, etc.). The diaphragm 31 is a sheet structure to facilitate the piezoelectric drive 32 to drive it to bend and deform. When the diaphragm 31 is in the first state, the thickness direction X of the diaphragm 31 is consistent with the flow direction of the airflow in the connecting hole 40.

[0040] The piezoelectric drive element 32 is a device that converts electrical energy into mechanical energy using the inverse piezoelectric effect. The piezoelectric drive element 32 can be stretched or contracted to a certain extent under the action of a certain alternating current, thereby driving the diaphragm 31 stacked on one side to deform. When the diaphragm 31 is in the first state, the diaphragm 31 can be in a flat state, and the diaphragm 31 can close the connecting hole 40, so that the connecting hole 40 is closed; Figure 8 In the illustrated embodiment, when the diaphragm 31 is in the second state, the diaphragm 31 is deformed by the action of the piezoelectric driver 32, so that the diaphragm 31 cannot close the communicating hole 40, and the communicating hole 40 is conductive. Of course, under the action of different electric field strengths, the diaphragm 31 is subjected to different forces from the piezoelectric driver 32, so that the diaphragm 31 is deformed to different degrees, so that the electric field strength of the piezoelectric driver 32 can be controlled to drive the diaphragm 31 to deform to different degrees, so as to obtain communicating holes 40 with different conductive diameters, that is, communicating holes 40 with different air leakage amounts.

[0041] In the sound device 100 provided in the present application, by setting the adjustment component 3, the connecting hole 40 is closed by the diaphragm 31 in the first state, or the connecting hole 40 is connected by the diaphragm 31 in the second state as needed. When the connecting hole 40 set in the sound unit 2 is connected, the front cavity 20 and the rear cavity 30 can balance the air pressure through the connecting hole 40, thereby improving the low-frequency sound effect of the sound device 100. When the connecting hole 40 set in the sound unit 2 is closed, the front cavity 20 and the rear cavity 30 are connected through the connecting hole 40. , reducing the low-frequency sound effect of the sound device 100; when the connecting hole 40 set in the shell is connected, the front cavity 20 and the external space can balance the air pressure through the connecting hole 40, reducing the excessive pressure in the user's ear canal caused by the vibration of the diaphragm; when the connecting hole 40 set in the sound unit 2 is closed, the connecting hole 40 does not connect the front cavity 20 and the external space, thereby improving the physical noise reduction effect of the sound device 100. Therefore, the sound device 100 provided in the present application can adjust the conduction or closure of the connecting hole 40 according to the requirements of the scene to improve the sound quality of the sound device.

[0042] See also Fig. 9 In some other embodiments, the regulating component 3 further includes a piezoelectric sensing element 33, which is stacked on the diaphragm 31 along the thickness direction X to convert the deformation of the diaphragm 31 into an electrical signal.

[0043] Unlike the aforementioned piezoelectric drive element 32 which converts electrical signals into mechanical energy, the piezoelectric sensing element 33 is used to convert mechanical energy into electrical signals. When the air pressure in the front chamber 20 is too high, the diaphragm 31 will deform away from the front chamber 20 under the action of the pressure difference. When the air pressure in the front chamber 20 is too low, the diaphragm 31 will deform toward the front chamber 20 under the action of the pressure difference. The piezoelectric sensing element 33 stacked on the diaphragm 31 is subjected to the mechanical force generated by the deformation of the diaphragm 31. The piezoelectric sensing element 33 converts the mechanical force into an induced electrical signal. By analyzing the induced electrical signal, the air pressure value of the front chamber 20 can be obtained.

[0044] The piezoelectric sensing element 33 can be electrically connected to an external control chip. The external control chip can analyze the induced electrical signal generated by the piezoelectric sensing element 33 to determine whether the air pressure in the front cavity 20 meets the operating rules of the sound-emitting device 100. When the electrical signal generated by the piezoelectric sensing element 33 does not meet the operating rules of the sound-emitting device 100, the external control chip can send a driving electrical signal to the piezoelectric driving element 32 to control the piezoelectric driving element 32 to drive the diaphragm 31 to deform, so that the air pressure in the front cavity 20 meets the operating mode requirements of the sound-emitting device 100.

[0045] For example: when the air pressure in the front chamber 20 is too high, the diaphragm 31 deforms in the direction away from the front chamber 20, and the piezoelectric sensing element 33 stacked on the diaphragm 31 is subjected to the mechanical force generated by the deformation of the diaphragm 31, and converts the mechanical force into an induced electrical signal. The external control chip can determine whether the induced electrical signal is greater than the preset comfort threshold. If the induced electrical signal is greater than the preset comfort threshold, it means that the air pressure in the front chamber 20 is too high, which may cause discomfort to the user. When the induced electrical signal is greater than the preset comfort threshold, the external control chip sends a driving electrical signal to the piezoelectric driving element 32, and the piezoelectric driving element 32 drives the diaphragm 31 to deform according to the driving electrical signal, and at least one of the external space and the rear chamber 30 is connected to the front chamber 20 through the connecting hole 40, so that the air pressure of the front chamber 20 is balanced with that of the external space, or the air pressure of the front chamber 20 is balanced with that of the rear chamber 30, thereby reducing the air pressure of the front chamber 20.

[0046] In some embodiments, the diaphragm 31 includes multiple sub-diaphragms 311. When the diaphragm 31 is in a first state, the multiple sub-diaphragms 311 are spliced ​​with each other; when the diaphragm 31 is in a second state, at least one sub-diaphragm 311 is bent, and a gap 34 is formed between the bent sub-diaphragm 311 and the adjacent sub-diaphragm 311.

[0047] Each sub-diaphragm 311 may have a different shape or the same shape. Multiple sub-diaphragms 311 may be arranged in sequence along the circumference of the connecting hole 40 to simplify the arrangement of each sub-diaphragm 311. When the diaphragm 31 is in the first state, each sub-diaphragm 311 is spliced ​​with each other, and adjacent sub-diaphragms 311 may be partially overlapped or arranged adjacent to each other, as long as the overall structure formed by each sub-diaphragm 311 can close the connecting hole 40. Partial areas of multiple sub-diaphragms 311 may be arranged to be connected to the same piezoelectric driver 32, so that the same piezoelectric driver 32 can drive multiple sub-diaphragms 311 to deform at the same time. Only one sub-diaphragm 311 among multiple sub-diaphragms 311 may also be arranged to be connected to the piezoelectric driver 32, so that the piezoelectric driver 32 can only drive one sub-diaphragm 311 among the multiple sub-diaphragms 311 to deform. It can be understood by those skilled in the art that when a sub-diaphragm 311 is deformed, the relative position relationship of each sub-diaphragm 311 changes, such as Fig.10 In the embodiment shown, a gap 34 for air flow can be formed between the deformed sub-diaphragm 311 and the undeformed sub-diaphragm 311, so that the connecting hole 40 is connected. Fig.11 In the illustrated embodiment, a gap 34 for air flow may be formed between the deformed sub-diaphragms 311 , so that the communication holes 40 are connected.

[0048] Exemplarily, there are two sub-diaphragms 311, both of which are rectangles of the same shape and size, and the connecting hole 40 is elliptical. When the diaphragm 31 is in the first state, the sides of the two sub-diaphragms 311 are arranged adjacent to each other, and the two sub-diaphragms 311 are spliced ​​to form a rectangular structure with a closed connecting hole 40. When the diaphragm 31 is in the second state, the two sub-diaphragms 311 undergo a certain degree of bending deformation, and a gap 34 is formed at one end of the two sub-diaphragms 311 close to the central axis of the diaphragm 31.

[0049] Exemplarily, there are three sub-diaphragms 311, all of which are fans of the same shape and size, and the connecting hole 40 is circular. When the diaphragm 31 is in the first state, the sides of the three sub-diaphragms 311 are adjacent to each other, and the three sub-diaphragms 311 are spliced ​​to form a circular structure with a closed connecting hole 40. When the diaphragm 31 is in the second state, one of the three sub-diaphragms 311 undergoes a certain degree of bending deformation, and a gap 34 is formed at one end of the three sub-diaphragms 311 close to the central axis of the diaphragm 31.

[0050] Exemplarily, there are four sub-diaphragms 311, all of which are triangles with the same shape and size, and the connecting hole 40 is rectangular. When the diaphragm 31 is in the first state, the four sub-diaphragms 311 are partially overlapped, and the four sub-diaphragms 311 are spliced ​​to form a rectangular structure with a closed connecting hole 40. When the diaphragm 31 is in the second state, two of the four sub-diaphragms 311 undergo a certain degree of bending deformation, and a gap 34 is formed at one end of the four sub-diaphragms 311 close to the central axis of the diaphragm 31.

[0051] The air at both ends of the connecting hole 40 can flow through the gap 34, so by providing a plurality of sub-diaphragms 311, the piezoelectric driver 32 can be used to deform part or all of the sub-diaphragms 311 to obtain connecting holes 40 with different air leakage amounts.

[0052] In one embodiment, there are multiple piezoelectric driving elements 32 , and the multiple piezoelectric driving elements 32 are connected to the multiple sub-diaphragms 311 in a one-to-one correspondence, so that each sub-diaphragm 311 can be driven by each piezoelectric driving element 32 to deform.

[0053] See also Fig.12 In some embodiments, the piezoelectric driving components 32 connected to two adjacent sub-diaphragms 311 are respectively arranged on different sides of the diaphragm 31 , and the piezoelectric driving components 32 are used to drive the sub-diaphragms 311 connected thereto to bend in a direction close to the piezoelectric driving components 32 .

[0054] According to the principle that the piezoelectric driver 32 drives the sub-diaphragm 311 to deform, the piezoelectric driver 32 expands and contracts perpendicular to the thickness direction under the action of the electric field, and under the action of the electric field of the same magnitude, the two adjacent piezoelectric drivers 32 expand and contract to the same extent. Compared with the piezoelectric drivers 32 connected to the two adjacent sub-diaphragms 311 being arranged on the same side of the diaphragm 31, for example Fig.11 In the embodiment shown, the piezoelectric driver 32 is connected to different sides of the thickness direction of the diaphragm 311, and the size of the obtained gap 34 is larger. Therefore, by arranging the piezoelectric driver 32 connecting two adjacent sub-diaphragms 311 on different sides of the diaphragm 31, each sub-diaphragm 311 can be controlled to bend in different directions, so as to obtain a larger gap 34 with a smaller voltage.

[0055] In one embodiment, the piezoelectric driver 32 is stacked on the diaphragm 31 along the thickness direction of the diaphragm 31, and the projection of the piezoelectric driver 32 along the thickness direction at least partially falls on the diaphragm 31, that is, the size of the piezoelectric driver 32 can be smaller than or equal to the diaphragm 31. The larger the size of the piezoelectric driver 32, the larger the contact area between the piezoelectric driver 32 and the diaphragm 31, so that the area of ​​the diaphragm 31 driven by the piezoelectric driver 32 is larger. Please refer to Fig.13 ,exist Fig.13 In the illustrated embodiment, the size of the piezoelectric driver 32 is smaller than the diaphragm 31. Since the piezoelectric driver 32 has a certain thickness, under the same pressure difference, the smaller the size of the piezoelectric driver 32, the greater the deformation amplitude of the diaphragm 31, that is, the higher the sensitivity of the piezoelectric sensing element 33. Those skilled in the art can determine the proportional relationship of the piezoelectric driver 32 to the diaphragm 31 as needed.

[0056] Please refer to Fig.14 In some embodiments, the piezoelectric driving element 32 includes a first driving electrode 321, a second driving electrode 322 and a piezoelectric driving layer 323. The first driving electrode 321 is connected to the diaphragm 31, the second driving electrode 322 is arranged on a side of the first driving electrode 321 away from the diaphragm 31, and the piezoelectric driving layer 323 is arranged between the first driving electrode 321 and the second driving electrode 322.

[0057] The piezoelectric drive layer 323 can specifically be a piezoelectric ceramic material. The first drive electrode 321 and the second drive electrode 322 cooperate with each other to apply a voltage to the piezoelectric drive layer 323. The piezoelectric drive layer 323 generates a contraction force perpendicular to the thickness direction under the action of the electric field along the thickness direction, thereby driving the sub-diaphragm 311 connected thereto to bend and deform. Those skilled in the art can understand that regarding piezoelectric materials, their piezoelectric conversion ability can be represented by the piezoelectric constant Dij, where i represents the electrical direction, j represents the mechanical direction, i is 1, 2 or 3, indicating that the surface generating the charge is perpendicular to the x-axis, y-axis or z-axis respectively; j = 1, 2, 3, 4, 5 or 6, respectively representing the normal stress acting along the x-axis, y-axis, and z-axis directions and the shear force acting in the plane perpendicular to the x-axis, y-axis, and z-axis. From the above analysis, it can be seen that the piezoelectric drive layer 323 can adopt the D31 working mode, and its electric field direction is perpendicular to the mechanical force direction.

[0058] A piezoelectric sensing element 33 can be set to determine whether the pressure in the front chamber 20 is appropriate, so in some embodiments, only one sub-diaphragm 311 is set among multiple sub-diaphragms 311 to be stacked with the piezoelectric sensing element 33, and in order to improve the sensitivity of the piezoelectric sensing element 33, the piezoelectric sensing element 33 and the piezoelectric driving element 32 are respectively arranged on opposite sides of the diaphragm 31 along the thickness direction, so that the piezoelectric sensing element 33 and the piezoelectric driving element 32 have a larger contact area with the diaphragm 31.

[0059] In order to ensure the overall weight balance of the diaphragm 31, the adjustment component 3 further includes a counterweight 4, the weight of which is the same as that of the piezoelectric sensing element 33, the number of which is at least one, and the sub-diaphragm 311 is connected to either the piezoelectric sensing element 33 or the counterweight 4. It can be considered that the sub-diaphragm 311 not connected to the piezoelectric sensing element 33 is connected to the corresponding counterweight 4, so that each sub-diaphragm 311 is connected to a piezoelectric sensing element 33 or a counterweight 4 of the same weight.

[0060] The counterweight 4 can be a piezoelectric sensing component 33 that is not electrically connected, or a component made of other materials that has the same volume and weight as the piezoelectric sensing component 33 .

[0061] In some embodiments, the piezoelectric sensing element 33 includes a first sensing electrode 331, a second sensing electrode 332 and a piezoelectric sensing layer 333. The first sensing electrode 331 is connected to the diaphragm 31, the second sensing electrode 332 is arranged on a side of the first sensing electrode 331 away from the diaphragm 31, and the piezoelectric sensing layer 333 is arranged between the first sensing electrode 331 and the second sensing electrode 332.

[0062] The piezoelectric sensing layer 333 can be specifically made of piezoelectric ceramic material. When the diaphragm 31 is bent and deformed by the pressure difference, the diaphragm 31 generates a mechanical force along the thickness direction on the piezoelectric sensing layer 333. Under the action of the mechanical force, the piezoelectric sensing layer 333 changes the charge between the first sensing electrode 331 and the second sensing electrode 332, and outputs the changed induced electrical signal. From the above analysis, it can be seen that the piezoelectric sensing layer 333 adopts the D33 working mode, and its electric field direction is the same as the mechanical force direction.

[0063] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A sound-generating device, characterized in that: include: A housing having a receiving space; A sound-generating unit is contained in the containing space, the sound-generating unit divides the containing space into a front cavity and a rear cavity, the sound-generating unit and at least one of the housing has a connecting hole, the connecting hole is connected to the front cavity, the sound-generating unit has a diaphragm, and the sound-generating unit vibrates through the diaphragm to generate sound; The regulating component comprises a diaphragm, a piezoelectric driving component and a piezoelectric sensing component. The diaphragm is arranged at the communicating hole, the piezoelectric driving component is arranged on the diaphragm, and the piezoelectric driving component is used to drive the diaphragm to deform. When the diaphragm is in the first state, the communication hole is closed; When the diaphragm is in the second state, the communication hole is connected; The piezoelectric sensing element is stacked on the diaphragm along the thickness direction of the diaphragm and is used to convert the deformation of the diaphragm into an electrical signal.

2. The sound-generating device according to claim 1, characterized in that: The diaphragm includes a plurality of sub-diaphragms. When the diaphragm is in the first state, the plurality of sub-diaphragms are spliced ​​with each other. When the diaphragm is in the second state, at least one sub-diaphragm is bent, and a gap is formed between the bent sub-diaphragm and an adjacent sub-diaphragm.

3. The sound-generating device according to claim 2, characterized in that: The plurality of sub-diaphragms are sequentially arranged along the circumferential direction of the communicating hole.

4. The sound-generating device according to claim 2, characterized in that: There are multiple piezoelectric driving components, and the multiple piezoelectric driving components are connected to the multiple sub-diaphragms in a one-to-one correspondence.

5. The sound-generating device according to claim 4, characterized in that: The piezoelectric driving components connected to two adjacent sub-diaphragms are respectively arranged on different sides of the diaphragm, and the piezoelectric driving components are used to drive the sub-diaphragms connected thereto to bend in a direction close to the piezoelectric driving components.

6. The sound-generating device according to claim 2, characterized in that: The adjustment component also includes a counterweight, the weight of the counterweight is the same as the weight of the piezoelectric sensing element, the number of the piezoelectric sensing element is at least one, and the sub-diaphragm is connected to any one of the piezoelectric sensing element or the counterweight.

7. The sound-generating device according to claim 1, characterized in that: The piezoelectric sensing element includes a first sensing electrode, a second sensing electrode and a piezoelectric sensing layer, the first sensing electrode is connected to the diaphragm, the second sensing electrode is arranged on a side of the first sensing electrode away from the diaphragm, and the piezoelectric sensing layer is arranged between the first sensing electrode and the second sensing electrode.

8. The sound-generating device according to claim 1, characterized in that: The piezoelectric driving component is stacked on the diaphragm along the thickness direction of the diaphragm, and the projection of the piezoelectric driving component along the thickness direction at least partially falls on the diaphragm.

9. The sound-generating device according to claim 1, characterized in that: The piezoelectric driving element includes a first driving electrode, a second driving electrode and a piezoelectric driving layer, the first driving electrode is connected to the diaphragm, the second driving electrode is arranged on a side of the first driving electrode away from the diaphragm, and the piezoelectric driving layer is arranged between the first driving electrode and the second driving electrode.

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