Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment. The sound production device comprises a shell; the partition plate is arranged in the shell, the partition plate comprises a first side and a second side which are arranged oppositely, and the first side of the partition plate and the shell define a first cavity; the vibration assembly is arranged in the shell, the vibration assembly is located on the second side of the partition plate, and a second cavity is defined by the vibration assembly and the second side of the partition plate; wherein the partition plate is provided with at least two through holes, the first cavity and the second cavity are communicated through the through holes, the opening areas of the at least two through holes in the partition plate are different, and / or the hole depths of the at least two through holes in the thickness direction of the partition plate are different.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electronic devices, and particularly relates to a sound production device and an electronic device. BACKGROUND

[0002] At present, a sound production device usually has a through hole in a magnetic circuit assembly to realize the communication between a cavity of a loudspeaker and a rear cavity to expand the rear cavity and reduce low-frequency frequency response.

[0003] However, the sound production device in the related art has a through hole in the magnetic circuit assembly, and the through hole is coupled with the rear cavity to form a Helmholtz resonance structure, which easily causes a deep resonance valley in a high-frequency region of a frequency response curve, causes serious attenuation of sound components in a specific frequency band, and damages sound quality. SUMMARY

[0004] The present application aims to provide a sound production device and an electronic device, and at least solve the problem that the sound production device in the related art easily causes a deep resonance valley in a high-frequency region of a frequency response curve, causes serious attenuation of sound components in a specific frequency band, and damages sound quality.

[0005] To solve the above technical problems, the present application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a sound production device, which comprises a shell, a partition plate arranged in the shell, the partition plate comprising a first side and a second side arranged oppositely, and the first side of the partition plate and the shell jointly defining a first cavity; a vibration assembly arranged in the shell, the vibration assembly being located at the second side of the partition plate and jointly defining a second cavity with the second side of the partition plate; wherein the partition plate is provided with at least two through holes, the first cavity and the second cavity are communicated through the through holes, the opening areas of the at least two through holes on the partition plate are different, and / or the hole depths of the at least two through holes along the thickness direction of the partition plate are different.

[0007] In a second aspect, an embodiment of the present application provides an electronic device, which comprises the sound production device according to any one of the first aspect.

[0008] In embodiments of this application, the sound-generating device includes a housing, a partition, and a vibration assembly. The housing constitutes the external support structure of the sound-generating device. The partition is disposed inside the housing and has two opposing surfaces, a first side and a second side. The first side of the partition and the inner wall of the housing together form a first cavity. The vibration assembly is disposed inside the housing and located on the second side of the partition, such that the vibration assembly and the second side of the partition together form a second cavity. Furthermore, the partition is designed with at least two through holes, through which the first cavity and the second cavity communicate with each other. Thus, when the vibration assembly operates and generates sound, airflow through the through holes generates acoustic resonance between the first cavity and the second cavity, thereby enabling each through hole to generate sound. The holes and the first cavity together form an independent Helmholtz resonator. At least two holes have different opening areas on the partition, or at least two holes have different depths along the thickness direction of the partition, or at least two holes have both differences in opening area and depth. That is, at least two holes have different physical dimensions, which makes the Helmholtz resonator unit formed by at least two holes have different resonant frequencies. This can separate the original large resonance valley into at least two small resonance valleys, thus dispersing the resonant energy, optimizing the smoothness of the frequency response curve, and thus optimizing the sound quality of the sound-generating device.

[0009] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0010] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0011] Figure 1 A schematic diagram of the Helmholtz resonator is shown.

[0012] Figure 2 This is one of the structural schematic diagrams of a sound-generating device according to an embodiment of this application;

[0013] Figure 3 This is one of the structural schematic diagrams of the partition according to an embodiment of this application;

[0014] Figure 4 yes Figure 3 The frequency versus sensitivity curves corresponding to the partition in the illustrated embodiment;

[0015] Figure 5 This is a second schematic diagram of the partition structure according to an embodiment of this application;

[0016] Figure 6 yes Figure 5 The frequency versus sensitivity curves corresponding to the partition in the illustrated embodiment;

[0017] Figure 7 is a third structural schematic view of a baffle according to an embodiment of the present application;

[0018] Figure 8 is a fourth structural schematic view of a baffle according to an embodiment of the present application; Figure 7 is a frequency and sensitivity curve diagram of the baffle of the embodiment shown in

[0019] Figure 9 is a fourth structural schematic view of a baffle according to an embodiment of the present application;

[0020] Figure 10 is a fourth structural schematic view of a baffle according to an embodiment of the present application; Figure 9 is a sectional view of the baffle of the embodiment shown in

[0021] Figure 11 is a second structural schematic view of a sound production device according to an embodiment of the present application.

[0022] Reference Signs:

[0023] 1 housing, 10 first cavity, 12 second cavity, 14 first housing, 16 second housing, 18 support, 2 baffle, 20 through hole, 22 air avoiding groove, 220 opening, 3 vibration assembly, 30 diaphragm, 32 ball top, 34 voice coil, 4 magnetic circuit assembly, 40 first magnetic conducting plate, 42 magnet structure, 44 second magnetic conducting plate, 46 third magnetic conducting plate, 48 first channel, 49 second channel, 5 throat, 6 cavity. DETAILED DESCRIPTION

[0024] The embodiments of the present application will be described in detail below with reference to the drawings, in which the same or similar components have the same reference numerals throughout the several views. The embodiments described below are examples for explaining the present application and are not intended to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0025] The terms "first", "second" in the specification and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified. In addition, "and / or" in the specification and claims means at least one of the connected objects.

[0026] In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0027] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] The sound generating device and the electronic device according to the embodiments of the present application will be described below in conjunction with Figures 1-11 The sound generating device and the electronic device according to the embodiments of the present application will be described below in conjunction with

[0029] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 8 The sound generating device according to some embodiments of the present application comprises a housing 1; a partition plate 2 arranged in the housing 1, the partition plate 2 comprising a first side and a second side arranged oppositely, and the first side of the partition plate 2 and the housing 1 together enclosing a first cavity 10; a vibration assembly 3 arranged in the housing 1, the vibration assembly 3 being located at the second side of the partition plate 2 and together enclosing a second cavity 12 with the second side of the partition plate 2; wherein the partition plate 2 is provided with at least two through holes 20, the first cavity 10 and the second cavity 12 are communicated through the through holes 20, the opening areas of the at least two through holes 20 on the partition plate 2 are different, and / or the hole depths of the at least two through holes 20 along the thickness direction of the partition plate 2 are different.

[0030] In the embodiments of the present application, the sound production device comprises a housing 1, a partition plate 2 and a vibration assembly 3. The housing 1 constitutes an external support structure of the sound production device, the partition plate 2 is arranged inside the housing 1, the partition plate 2 has two surfaces of a first side and a second side arranged oppositely, the first side of the partition plate 2 cooperates with the inner wall of the housing 1 to form a first cavity 10, the vibration assembly 3 is arranged inside the housing 1 and located at the second side of the partition plate 2, so that the vibration assembly 3 cooperates with the second side of the partition plate 2 to form a second cavity 12, and at least two through holes 20 are designed on the partition plate 2, the first cavity 10 and the second cavity 12 are communicated with each other through the through holes 20, so that when the vibration assembly 3 works and produces sound, airflow produces acoustic resonance between the first cavity 10 and the second cavity 12 through the through holes 20, so that each through hole 20 cooperates with the first cavity 10 to form an independent Helmholtz resonator, wherein the opening areas of the at least two through holes 20 on the partition plate 2 are different, or the hole depths of the at least two through holes 20 along the thickness direction of the partition plate 2 are different, or the at least two through holes 20 simultaneously have differences in the opening areas and the hole depths, that is, the physical sizes of the at least two through holes 20 are different, so that the Helmholtz resonant units formed by the at least two through holes 20 have different resonant frequencies, and then the original large resonance valley can be separated into at least two small resonance valleys, so that the resonant energy is dispersed, the smoothness of the frequency response curve is optimized, and then the sound quality of the sound production device is optimized.

[0031] It can be understood that, as shown in Figure 1 According to the principle of Helmholtz resonance, the resonant frequency is closely related to the equivalent area and the equivalent length of the throat pipe 5 and the volume of the back cavity 6. In the present application, the opening areas and / or the opening depths of the at least two through holes 20 are designed to be different, so that the resonant frequencies of the at least two through holes 20 are different, and then the large resonance valley is separated into two small resonance valleys, so as to improve the sound quality.

[0032] It should be noted that the opening area of the through hole 20 is the projection area of the through hole 20 in the plane perpendicular to the thickness direction of the partition plate 2.

[0033] According to some embodiments of the present application, optionally, the ratio of the opening areas of the at least two through holes 20 is greater than or equal to a first threshold value; and / or the ratio of the hole depths of the at least two through holes 20 is greater than or equal to a second threshold value.

[0034] In this embodiment, if the ratio of the opening areas of at least two through holes 20 is too small, the resonant frequencies of the at least two through holes 20 will be similarly small. Similarly, if the ratio of the hole depths of at least two through holes 20 is too small, the resonant frequencies of the at least two through holes 20 will also be similarly small. Therefore, setting the ratio of the opening areas of at least two through holes 20 to be greater than or equal to a first threshold and / or the ratio of the hole depths of at least two through holes 20 to be greater than or equal to a second threshold ensures that the resonant frequencies of multiple Helmholtz resonant structures can generate sufficient spacing, avoiding the problem of insufficient bandwidth due to frequencies being too close. By designing the ratio of the opening areas and / or hole depths of at least two through holes 20, the resonant energy is dispersed, optimizing the smoothness of the frequency response curve, thereby improving the overall acoustic performance of the sound-generating device.

[0035] It should be noted that the values ​​of the first and second thresholds can be set based on the material, thickness, length, width, and volume of the partition 2, as well as the volume of the first cavity 10. For example, when the partition 2 is made of a magnetic material, the first threshold can be set to 1.1, and the second threshold can also be set to 1.1. Of course, when the ratio of the opening areas of at least two through holes 20 is the ratio of the larger area to the smaller area, the first threshold can also be any value greater than 1. Similarly, when the ratio of the hole depths of at least two through holes 20 is the ratio of the deeper hole to the shallower hole, the second threshold can also be any value greater than 1.

[0036] According to some embodiments of this application, optionally, in all the through holes 20, the opening area of ​​at least three through holes 20 increases sequentially; and / or in all the through holes 20, the hole depth of at least three through holes 20 increases sequentially.

[0037] In this embodiment, at least three of the through holes 20 have different opening areas, and the opening areas of these through holes 20 are sequentially increasing. This results in a sequential increase in the resonant frequencies generated by these through holes 20, ensuring the optimization of the frequency response curve. Correspondingly, at least three of the through holes 20 have different depths, and the depths of these through holes 20 are sequentially increasing. This also results in a sequential increase in the resonant frequencies generated by these through holes 20, ensuring the optimization of the frequency response curve.

[0038] Optionally, such as Figure 5 and Figure 6 As shown, according to some embodiments of this application, optionally, the number of through holes 20 is greater than or equal to 3; wherein, the opening area of ​​all through holes 20 is different, and / or the hole depth of all through holes 20 is different.

[0039] In this embodiment, in the case where the number of the through holes 20 is greater than or equal to 3, the opening areas of all the through holes 20 are different, and / or the hole depths of all the through holes 20 are different, that is, there is a difference between the sizes of all the through holes 20, so that the resonant frequencies of the Helmholtz resonance structures formed by each of the through holes 20 are different, and further, the large resonant valley is separated into multiple small resonant valleys, so that the resonant energy is more dispersed, the frequency response curve is smoother, and further, the sound quality of the sound production device is optimized.

[0040] Optionally, in the through holes 20 with different opening areas, the opening areas of the through holes 20 are arranged in ascending order and increase at equal proportions, for example, the ratio of the opening area of the through hole 20 arranged in the second place to the opening area of the through hole 20 arranged in the first place is A, and the ratio of the opening area of the through hole 20 arranged in the third place to the opening area of the through hole 20 arranged in the second place is also A.

[0041] Optionally, in the through holes 20 with different hole depths, the hole depths of the through holes 20 are arranged in ascending order and increase at equal proportions, for example, the ratio of the hole depth of the through hole 20 arranged in the second place to the hole depth of the through hole 20 arranged in the first place is B, and the ratio of the hole depth of the through hole 20 arranged in the third place to the hole depth of the through hole 20 arranged in the second place is also B. Wherein, A and B are positive numbers greater than 1.

[0042] According to some embodiments of the present application, optionally, in all the through holes 20, in the case where the opening areas of at least three through holes 20 increase in turn, the ratio between the opening areas of two through holes 20 that increase in turn is greater than or equal to a third threshold value; in the case where the hole depths of at least three through holes 20 increase in turn, the ratio between the hole depths of two through holes 20 that increase in turn is greater than or equal to a fourth threshold value.

[0043] In this embodiment, after the opening areas of at least three through holes 20 are arranged in ascending order, if the ratio between the opening areas of two through holes 20 that increase in turn is too small, it will result in a small difference in the resonant frequencies of at least two through holes 20, and accordingly, after the hole depths of at least three through holes 20 are arranged in ascending order, if the ratio between the hole depths of two through holes 20 that increase in turn is too small, it will result in a small difference in the resonant frequencies of at least two through holes 20; therefore, the ratio between the opening areas of two through holes 20 that increase in turn is set to be greater than or equal to a third threshold value, and the ratio between the hole depths of two through holes 20 that increase in turn is set to be greater than or equal to a fourth threshold value, so as to ensure that the resonant frequencies of multiple Helmholtz resonance structures can have sufficient intervals, and avoid the problem that the frequency cannot be effectively widened due to being too close. By designing the ratio of the opening areas and / or hole depths of the through holes 20, the resonant energy is dispersed, the smoothness of the frequency response curve is optimized, and thus the overall acoustic performance of the sound production device is improved.

[0044] It should be noted that the third threshold value and the fourth threshold value can be set according to the material and thickness of the partition plate 2, the length and width of the partition plate 2, the volume of the first cavity 10, etc. For example, in the case where the partition plate 2 is a magnetic conductive material, the third threshold value can be set to 1.1, and the fourth threshold value can be set to 1.1. Of course, the third threshold value can also be any value greater than 1. The fourth threshold value can also be any value greater than 1.

[0045] According to some embodiments of the present application, optionally, in the case where the opening areas of all the through holes 20 are not the same, after the opening areas of all the through holes 20 are arranged in ascending order, the opening areas of three through holes 20 with sequentially increasing opening areas are sequentially defined as a first area, a second area, and a third area; the ratio of the second area to the first area is a first ratio, the ratio of the third area to the first area is a second ratio, and the difference between the second ratio and the first ratio is x; wherein the first ratio is greater than or equal to 1.1, and x is greater than or equal to 0.1.

[0046] In this embodiment, in the case where the opening areas of all the through holes 20 are not the same, when these opening areas are arranged in ascending order according to their values, the opening areas of three through holes 20 with sequentially increasing opening areas are sequentially defined as a first area, a second area, and a third area. Among them, the ratio of the second area to the first area, i.e. the first ratio, is greater than or equal to 1.1, which ensures that there is a clear and non-negligible area difference between adjacent through holes 20. At the same time, the ratio of the third area to the first area is a second ratio, and the difference x between the second ratio and the first ratio must be greater than or equal to 0.1, so that after the opening areas are arranged in ascending order according to their values, there is a certain difference between the opening areas of the three through holes 20 with sequentially increasing opening areas, and further to ensure that the frequencies of the resonance waves generated by the three through holes 20 have a certain difference, so that the frequency response curve is smoother, and further to optimize the sound quality of the sound generating device.

[0047] It can be understood that when these opening areas are arranged in ascending order according to their values, the opening areas of three through holes 20 with sequentially increasing opening areas are sequentially defined as a first area, a second area, and a third area, for example, the ratio of the second area to the first area is 1.1, and the ratio of the third area to the first area is 1.2, so that the first ratio is 1.1 and x is 0.1.

[0048] According to some embodiments of the present application, optionally, in the case where the hole depths of all the through holes 20 are not the same, after the hole depths of all the through holes 20 are arranged in ascending order, the hole depths of three through holes 20 with hole depths increasing in turn are first depth, second depth and third depth in turn; the ratio of the second depth to the first depth is a third ratio, the ratio of the third depth to the first depth is a fourth ratio, and the difference between the fourth ratio and the third ratio is y; wherein the third ratio is greater than or equal to 1.1, and y is greater than or equal to 0.1.

[0049] In this embodiment, in the case where the depths of all the through holes 20 are not the same, when the depths are arranged in ascending order according to the values, the depths of three through holes 20 with depths increasing in turn are defined as first depth, second depth and third depth in turn. Among them, the ratio of the second depth to the first depth, i.e. the third ratio, is greater than or equal to 1.1, which ensures that there is a clear and non-negligible depth difference between adjacent through holes 20. At the same time, the ratio of the third depth to the first depth is a fourth ratio, and the difference y between the fourth ratio and the third ratio must be greater than or equal to 0.1, so that after the depths are arranged in ascending order according to the values, there is a certain difference between the depths of the three through holes 20 with depths increasing in turn, and then it is ensured that the frequencies of the resonance waves generated by the three through holes 20 have a certain difference, so that the frequency response curve is smoother, and then the sound quality of the sound production device is optimized.

[0050] It can be understood that when the depths are arranged in ascending order according to the values, the depths of three through holes 20 with depths increasing in turn are defined as first depth, second depth and third depth in turn, for example, the ratio of the second depth to the first depth is 1.1, and the ratio of the third depth to the first depth is 1.2, so that the third ratio is 1.1 and y is 0.1.

[0051] As shown in Figure 7 , Figure 8 , Figure 9 and Figure 10 , according to some embodiments of the present application, optionally, at least one of the first side and the second side of the partition plate 2 is provided with at least one avoidance slot 22; wherein the at least one through hole 20 avoids the avoidance slot 22 and penetrates through the first side of the partition plate 2 and the second side of the partition plate 2, and the at least one through hole 20 is arranged at the bottom wall of the avoidance slot 22, so that the hole depths of the at least two through holes 20 are different; or the number of avoidance slots 22 is at least two, and the depths of the at least two avoidance slots 22 along the thickness direction of the partition plate 2 are different, and the at least two through holes 20 are arranged in the avoidance slots 22 with different depths respectively, so that the hole depths of the at least two through holes 20 are different.

[0052] In this embodiment, at least one clearance groove 22 is arranged on the first side surface and / or the second side surface of the partition plate 2. Since the clearance groove 22 itself has a certain depth, the effective hole depth of the through hole 20 opened on the bottom wall thereof is equal to the basic thickness of the partition plate 2 minus the depth of the clearance groove 22, thereby forming a depth difference with other through holes 20 directly opened on the surface of the main body of the partition plate 2 without the clearance groove 22. Optionally, for the arrangement of at least two through holes 20, at least one through hole 20 can be arranged in the area avoiding the clearance groove 22 and normally penetrates the thickness of the partition plate 2, so that the hole depth of this through hole 20 is equal to the thickness of the partition plate 2; at the same time, at least one through hole 20 is arranged on the bottom wall of the clearance groove 22, so that the hole depth of this through hole 20 is equal to the difference between the thickness of the partition plate 2 and the groove depth of the clearance groove 22, thereby making the hole depths of the at least two through holes 20 different. Alternatively, for the arrangement of at least two through holes 20, at least two through holes 20 can be arranged in two clearance grooves 22 with different depths respectively, thereby making the hole depths of the through holes 20 arranged in the clearance grooves 22 with different depths different, and realizing the differential design of the hole depths of the at least two through holes 20.

[0053] Optionally, the clearance groove 22 can be arranged on the first side or the second side. Of course, in the case of requiring multiple clearance grooves 22, the clearance grooves 22 can also be arranged on the first side and the second side respectively.

[0054] It should be noted that, in the case that the clearance groove 22 is arranged on the first side of the partition plate 2, the distance between the bottom wall of the clearance groove 22 and the surface of the second side of the partition plate 2 is the hole depth of the through hole 20; in the case that the clearance groove 22 is arranged on the second side of the partition plate 2, the distance between the bottom wall of the clearance groove 22 and the surface of the first side of the partition plate 2 is the hole depth of the through hole 20.

[0055] It can be understood that the clearance groove 22 is a groove arranged on the first side or the second side of the partition plate 2.

[0056] Optionally, as shown in Figure 9 and Figure 10 , the depth of one through hole 20 is L1, and the depth of the other through hole 20 arranged on the bottom wall of the clearance groove 22 is L2, wherein L1 is greater than L2.

[0057] According to some embodiments of the present application, optionally, the clearance groove 22 comprises an opening 220, the opening 220 is arranged opposite to the through hole 20, and the side wall of the clearance groove 22 is arranged inwardly of the clearance groove 22 from the opening 220 to the bottom wall of the clearance groove 22.

[0058] In this embodiment, the side wall of the air avoidance groove 22 is inclinedly arranged from the opening 220 to the bottom wall of the air avoidance groove 22, so that in the gradually inclined area, the impedance of the air flow is gradually matched, and then the Helmholtz effect does not occur in the inclined area corresponding to the side wall of the air avoidance groove 22, and then the frequency response curve does not have a large fluctuation.

[0059] It can be understood that according to the principle of Helmholtz effect, at the position where the air flow channel has a mutation, impedance mismatch will occur, and then the Helmholtz effect will be caused, therefore, by gradually changing the inclined structure, the area corresponding to the air avoidance groove 22 will not produce the Helmholtz effect.

[0060] As shown in Figure 2 and Figure 11 According to some embodiments of the present application, the sound generating device further comprises a magnetic circuit assembly 4, the vibration assembly 3 is connected with the magnetic circuit assembly 4 and encloses the second cavity 12 with the magnetic circuit assembly 4; wherein the magnetic circuit assembly 4 comprises a first magnetic conducting plate 40, and the partition plate 2 is the first magnetic conducting plate 40.

[0061] In this embodiment, the sound generating device further comprises a magnetic circuit assembly 4, the vibration assembly 3 is connected with the magnetic circuit assembly 4 and encloses the second cavity 12 with the magnetic circuit assembly 4, the magnetic circuit assembly 4 contains a first magnetic conducting plate 40, and the partition plate 2 is the first magnetic conducting plate 40 in the magnetic circuit assembly 4, that is, the through hole 20 is arranged on the first magnetic conducting plate 40. Wherein, the first magnetic conducting plate 40 as a part of the magnetic circuit, is used for guiding and concentrating the magnetic induction lines, and provides a stable magnetic circuit environment for the vibration assembly 3, the vibration assembly 3 vibrates under the force in the magnetic field to generate sound, the sound propagates between the first cavity 10 and the second cavity 12 through the through hole 20 on the first magnetic conducting plate 40 to form a Helmholtz resonance effect, and by making at least two through holes 20 have size difference, the smoothness of the frequency response curve is optimized. The sound generating device provided by the present application realizes the functional integration of components by using the first magnetic conducting plate 40 of the magnetic circuit assembly 4 as the partition plate 2, reduces the need for separately arranging the partition plate 2, helps to simplify the internal structure of the sound generating device, reduces the assembly complexity, and can realize the reduction of the thickness or volume of the device; at the same time, the first magnetic conducting plate 40 as a part of the magnetic circuit usually has high structural strength and rigidity, which can help to improve the stability of the partition plate 2 part, and then can have a positive effect on the stability of the acoustic characteristics of the through hole 20.

[0062] As shown in Figure 2 and Figure 11As shown, according to some embodiments of the present application, the magnetic circuit assembly 4 optionally further comprises a magnet structure 42, a second magnetic conducting plate 44 and a third magnetic conducting plate 46; the third magnetic conducting plate 46 is arranged around the second magnetic conducting plate 44, the magnet structure 42 is located on the side of the second magnetic conducting plate 44 and the third magnetic conducting plate 46 away from the vibration assembly 3, and the first magnetic conducting plate 40 is arranged on the side of the magnet structure 42 away from the second magnetic conducting plate 44 and the third magnetic conducting plate 46; wherein the second magnetic conducting plate 44 and the third magnetic conducting plate 46 jointly enclose a first channel 48, the magnet structure 42 has a second channel 49, the first channel 48, the second channel 49 and the through hole 20 are oppositely arranged and connected, and a part of the vibration assembly 3 is inserted into the first channel 48 and the second channel 49.

[0063] In this embodiment, the magnetic circuit assembly 4 further comprises a magnet structure 42, a second magnetic conducting plate 44 and a third magnetic conducting plate 46; these components together with the first magnetic conducting plate 40 form a magnetic circuit system. Among them, the third magnetic conducting plate 46 is arranged around the second magnetic conducting plate 44, and jointly encloses a first channel 48 with the second magnetic conducting plate 44; the magnet structure 42 is located on the side of the second magnetic conducting plate 44 and the third magnetic conducting plate 46 away from the vibration assembly 3, and has a second channel 49; the first channel 48, the second channel 49 and the through hole 20 arranged on the first magnetic conducting plate 40 are oppositely arranged and connected, forming a continuous channel system; a part of the structure of the vibration assembly 3 is inserted into the space formed by the first channel 48 and the second channel 49. When the sound generating device is working, the magnet structure 42 generates a constant magnetic field, the second magnetic conducting plate 44 and the third magnetic conducting plate 46 are used to guide and concentrate the magnetic induction lines to form a magnetic gap suitable for driving the vibration assembly 3 in the first channel 48; when the current passes through the voice coil 34 of the vibration assembly 3, the voice coil 34 is driven to vibrate the diaphragm 30 to generate sound in the magnetic gap; at the same time, the movement of the part of the structure of the vibration assembly 3 in the first channel 48 and the second channel 49, and the communication relationship formed by these channels and the through hole 20 on the first magnetic conducting plate 40, help to balance the air pressure around the sound generating device, especially the magnetic circuit system, and may reduce the adverse effects of air resistance on vibration.

[0064] Optionally, the at least two through holes 20 are distributed along the first direction.

[0065] Optionally, when the number of through holes 20 is greater than or equal to 3, the plurality of through holes 20 are arranged in two rows, and the two rows of through holes 20 are arranged along the first direction; when the number of through holes 20 in each row is a plurality, the plurality of through holes 20 are arranged along the second direction.

[0066] Optionally, the first direction and the second direction are perpendicular.

[0067] As Figure 2 andFigure 11 As shown, according to some embodiments of the present application, optionally, the shell 1 comprises: a first shell 14; a second shell 16, which is arranged opposite to the first shell 14; a bracket 18, which is arranged between the first shell 14 and the second shell 16, and the magnetic circuit assembly 4 and the vibration assembly 3 are both arranged on the bracket 18, and the magnetic circuit assembly 4 and the first shell 14 enclose the first cavity 10.

[0068] In this embodiment, the shell 1 comprises the first shell 14, the second shell 16 and the bracket 18, wherein the second shell 16 and the first shell 14 are arranged opposite to each other, and the bracket 18 is arranged between the first shell 14 and the second shell 16 and is connected with the first shell 14 and the second shell 16 respectively, thereby forming a stable mounting frame. The magnetic circuit assembly 4 and the vibration assembly 3 are both arranged on the bracket 18, that is, the bracket 18 serves as a core bearing structure for fixing and supporting the magnetic circuit assembly 4 and the vibration assembly 3. The first shell 14 and the second shell 16 jointly constitute an external protective structure of the sound production device, and provide a closed or semi-closed working space for the internal magnetic circuit assembly 4 and the vibration assembly 3; the bracket 18 serves as a key structure for connecting the first shell 14 and the second shell 16 and bearing the internal functional components, and ensures the accurate and stable relative positions of the magnetic circuit assembly 4 and the vibration assembly 3 inside the shell 1, which is crucial for maintaining the uniformity of the magnetic gap of the magnetic circuit system and the vibration stability of the vibration assembly 3.

[0069] According to one embodiment of the present application, an electronic device is also proposed, which comprises the sound production device as proposed in any of the above, and thus has all the beneficial effects of the sound production device, which will not be repeated here.

[0070] Optionally, the electronic device comprises a mobile phone, a tablet computer and the like.

[0071] According to some embodiments of the present application, optionally, the sound production device proposed in the present application is provided with through holes 20 of different sizes on the first magnetic conductive plate 40, so that the through holes 20 of different sizes form Helmholtz resonance structures of different resonance frequencies with the first cavity 10, thereby solving or weakening the problem of serious decline of the resonance valley in the frequency response curve caused by a single resonance frequency, and without occupying the space of the foam, which is conducive to the miniaturization design of the sound production device.

[0072] Optionally, the sound production device comprises a partition plate 2 arranged in the shell 1 to separate the space in the shell 1 into the first cavity 10 and the second cavity 12, wherein the first cavity 10 is the back cavity of the sound production device, and the partition plate 2 can be the first magnetic conductive plate 40 having a magnetic conductive effect, or can be an isolation plate made of other materials. The partition plate 2 is provided with a through hole 20, and the through hole 20 is used to communicate the first cavity 10 and the second cavity 12, so as to balance the pressure of the gas on both sides of the partition plate 2 during work.

[0073] Optionally, the number of through holes 20 is greater than or equal to 2, including but not limited to 2, 3, 4 or more.

[0074] Optionally, the projection area of the through hole 20 in the thickness direction of the partition plate 2 (i.e. the opening area) has at least two different areas, or the hole depth of the through hole 20 has at least two different depths.

[0075] Optionally, the sound generating device includes a vibration assembly 3 and a magnetic circuit assembly 4, and the shell 1 includes a first shell 14, a second shell 16 and a bracket 18, wherein the bracket 18 serves to connect the vibration assembly 3 and the magnetic circuit assembly 4 of the sound generating device. The vibration assembly 3 includes a diaphragm 30, a dome 32 and a voice coil 34, and the magnetic circuit assembly 4 includes a second magnetic conducting plate 44, a third magnetic conducting plate 46, a magnet structure 42 and a first magnetic conducting plate 40. The bracket 18 is placed between the first shell 14 and the second shell 16 to form a complete sound generating device. A voice coil 34 capable of controlling the vibration direction is arranged below the diaphragm 30, the voice coil 34 is inserted into the magnetic circuit assembly 4, the magnetic circuit assembly 4 provides a constant magnetic field and under the magnetic concentrating effect of the first magnetic conducting plate 40, the second magnetic conducting plate 44 and the third magnetic conducting plate 46, so that the magnetic force line passes through the voice coil 34. The voice coil 34 is affected by the magnetic field between the second magnetic conducting plate 44 and the third magnetic conducting plate 46, and when corresponding music electrical signals are respectively input into the two voice coils 34, the magnetic field and the voice coil 34 generate an ampere force, which drives the diaphragm 30 to move and generate sound.

[0076] The music electrical signal is an alternating signal. When the voice coil 34 is subjected to an upward ampere force, the gas in the first shell 14 enters the bracket 18 through the through hole 20 of the first magnetic conducting plate 40; similarly, when the voice coil 34 is subjected to a downward ampere force, the gas in the bracket 18 enters the first shell 14 through the through hole 20 of the first magnetic conducting plate 40; the airflow generates acoustic resonance in the Helmholtz resonance structure composed of the second cavity 12 in the bracket 18, the through hole 20 on the first magnetic conducting plate 40 and the first cavity 10, which has the risk of causing a resonance valley in the high frequency of the frequency response curve.

[0077] The sound generating device provided in the present application has a plurality of through holes 20 of different sizes in the first magnetic conducting plate 40, which disperses the resonance energy without affecting the performance and ventilation efficiency of the sound generating device, optimizes the smoothness of the frequency response curve, and further optimizes the sound quality of the sound generating device.

[0078] The principle of Helmholtz resonance is:

[0079] The Helmholtz resonant cavity is a classic acoustic structure, often used for analyzing cavity resonance phenomena and designing sound absorption and noise reduction schemes. The core formula for calculating its resonant frequency is derived from the principle of air vibration. A complete Helmholtz resonant cavity calculation formula must include four basic variables: ① Effective volume V, representing the overall gas capacity of chamber 6, corresponding to the volume of the first cavity 10 in this application. ② Length L of the throat 5, referring to the length of the tubular structure connecting the internal and external environments, corresponding to the depth of the through-hole 20 in this application. ③ Cross-sectional area S of the throat 5, emphasizing the area effect of the physical opening 220, corresponding to the opening area of ​​the through-hole 20 in this application. ④ Sound velocity c, referring to the speed of sound propagation. The basic formula for calculating the Helmholtz resonant frequency f0 is:

[0080] ;

[0081] Based on this, if S in the above formula has different values, f0 will be different, which will disperse the harmonic energy of harmful resonance and thus flatten the frequency response curve.

[0082] Optionally, such as Figure 3 and Figure 4 As shown, two through holes 20 of different sizes, with areas S1 and S2, are designed in the first magnetic plate 40 of the sound-generating device. The Helmholtz resonance frequencies f1 and f2 formed by the first cavity 10 and these two through holes 20 are respectively:

[0083] ;

[0084] ;

[0085] The difference between f1 and f2 allows the original large resonance valley to be separated into two smaller resonance valleys, dispersing the resonant energy and smoothing the frequency response curve. In other words, the high-frequency valley depth H1 in this application is smaller than the high-frequency valley depth H0 in related technologies, thus optimizing sound quality.

[0086] Optionally, such as Figure 5 and Figure 6 As shown, four different through holes 20 with areas of S1, S2, S3, and S4 are designed in the first magnetic plate 40 of the sound-generating device. The Helmholtz resonance frequencies (f1, f2, f3, and f4) formed by the first cavity 10 and these four through holes 20 are respectively:

[0087] ;

[0088] ;

[0089] ;

[0090] ;

[0091] f1, f2, f3 and f4 are different, that is, the original large resonance valley can be separated into four small resonance valleys, so that the frequency response curve is further smoothed. Based on the resonance frequency formula, for the through holes 20 of different areas, assuming that the projection areas of the through holes in the thickness direction of the first magnetic conducting plate 40 are arranged from small to large, and are S1, S2, S3, …, respectively, in order to make the frequency response curve achieve a better flat effect, the opening area relationship of each through hole 20 should satisfy: S2≥S1×1.1, S3≥S1×1.2, S4≥S1×1.3, ….

[0092] According to some embodiments of the present application, optionally, as shown in Figure 7 and Figure 8 , the depth of the through hole 20 on the first magnetic conducting plate 40 can also be different, that is, L in the above formula has different values, so that f0 is different, the harmonic energy of harmful resonance is dispersed, and the same target of flattening the frequency response curve can also be achieved.

[0093] Based on the resonance frequency formula, for the through holes 20 of different depths, assuming that the depths of the through holes 20 are arranged from small to large, and are L1, L2, L3, …, respectively, in order to make the frequency response curve achieve a better flat effect, the depth relationship should satisfy: L2≥L1×1.1, L3≥L1×1.2, L4≥L1×1.3, ….

[0094] Similarly, the above two improvement ideas can also be combined, that is, the opening area size of the through hole 20 on the first magnetic conducting plate 40 can be designed to be different, and the depth of the through hole 20 on the first magnetic conducting plate 40 can also be designed to be different, to achieve the purpose of dispersing the harmonic energy of harmful resonance, and the same target of flattening the frequency response curve can also be achieved.

[0095] The embodiments provided in the present application have multiple size combinations of the opening size of the through hole 20 (including the horizontal size and the z-direction size), that is, the Helmholtz resonance structure has multiple resonance frequencies, which solves or weakens the problem of serious drop of the resonance valley in the frequency response curve caused by a single resonance frequency; through the arrangement of multiple through holes 20, the opening size of a single through hole 20 will not be too large, and the performance can be optimized, the assembly of auxiliary materials such as foam is facilitated, and the miniaturization of the sound generating device is facilitated.

[0096] In the description of the application, reference has been made to descriptive terms such as "one embodiment", "some embodiments", "an embodiment", "example", "specific example" or "some examples" etc. It is emphasized that each of these terms refers to a specific feature, structure, material or characteristic described in connection with a particular embodiment or example. The descriptive terms are not necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0097] While the embodiments of the application have been shown and described, it is to be understood that the embodiments described are only by way of example and that various changes, modifications, substitutions and alterations can be made thereto without departing from the spirit and scope of the application as set forth in the claims and equivalents thereof.

Claims

1. A sound-generating device, characterized in that, include: case; A partition is disposed within the housing. The partition includes a first side and a second side disposed opposite to each other. The first side of the partition and the housing enclose a first cavity. A vibration assembly is disposed within the housing, the vibration assembly being located on the second side of the partition and forming a second cavity with the second side of the partition; The partition plate has at least two through holes, the first cavity and the second cavity are connected through the through holes, the opening areas of the at least two through holes on the partition plate are different, and / or the hole depths of the at least two through holes are different along the thickness direction of the partition plate.

2. The sound-generating device according to claim 1, characterized in that, The ratio of the opening areas of at least two of the through holes is greater than or equal to a first threshold; and / or The ratio of the depths of at least two of the through holes is greater than or equal to a second threshold.

3. The sound-generating device according to claim 1, characterized in that, In all of the through holes, the opening areas of at least three of the through holes increase sequentially; and / or Of all the through holes, at least three of them have progressively increasing depths.

4. The sound-generating device according to claim 3, characterized in that, In all the through holes, if the opening area of ​​at least three of the through holes increases sequentially, the ratio between the opening areas of two of the through holes whose opening areas increase sequentially is greater than or equal to a third threshold. In all the through holes, if the depth of at least three of the through holes increases sequentially, the ratio between the depths of two of the through holes with sequentially increasing depths is greater than or equal to a fourth threshold.

5. The sound-generating device according to any one of claims 1 to 4, characterized in that, At least one of the first and second sides of the partition is provided with at least one air-proof groove; In this configuration, at least one of the through holes avoids the clearance groove and penetrates both the first and second sides of the partition plate; at least one of the through holes is located on the bottom wall of the clearance groove, such that the depths of at least two of the through holes are different; or The number of the clearance grooves is at least two, and the depth of the at least two clearance grooves along the thickness direction of the partition is different. The at least two through holes are respectively provided in the clearance grooves of different depths, so that the hole depths of the at least two through holes are different.

6. The sound-generating device according to claim 5, characterized in that, The cavitation groove includes an opening, which is disposed opposite to the through hole, and the sidewall of the cavitation groove is inclined from the opening to the bottom wall of the cavitation groove toward the interior of the cavitation groove.

7. The sound-generating device according to any one of claims 1 to 4, characterized in that, Also includes: A magnetic circuit assembly, wherein the vibration assembly is connected to the magnetic circuit assembly and encloses the second cavity with the magnetic circuit assembly; The magnetic circuit assembly includes a first magnetic plate, and the partition is the first magnetic plate.

8. The sound-generating device according to claim 7, characterized in that, The magnetic circuit assembly also includes: Magnet structure, second magnetic plate and third magnetic plate; The third magnetic plate is arranged around the second magnetic plate, the magnet structure is located on the side of the second magnetic plate and the third magnetic plate away from the vibration assembly, and the first magnetic plate is located on the side of the magnet structure away from the second magnetic plate and the third magnetic plate. The second magnetic plate and the third magnetic plate form a first channel, the magnet structure has a second channel, the first channel, the second channel and the through hole are arranged opposite to each other and connected, and a part of the vibration component is inserted into the first channel and the second channel.

9. The sound-generating device according to claim 7, characterized in that, The housing includes: First shell; The second housing is disposed opposite to the first housing; A bracket is disposed between the first housing and the second housing. The magnetic circuit assembly and the vibration assembly are both disposed on the bracket. The magnetic circuit assembly and the first housing enclose the first cavity.

10. An electronic device, characterized in that, include: The sound-generating device as described in any one of claims 1 to 9.

Images