Electronic device

Abstract

The invention provides electronic equipment, the electronic equipment comprises a middle frame and a loudspeaker assembly arranged in the middle frame, the middle frame is provided with a sound outlet channel used for being communicated with the outside, and the loudspeaker assembly comprises a loudspeaker body with a vibrating diaphragm; the loudspeaker body and the side wall surface of the sound outlet channel define a front sound cavity, the front sound cavity comprises a first cavity body and a second cavity body which are communicated with each other, the first cavity body directly faces the vibrating diaphragm, the second cavity body is located at one end of the first cavity body, and the sectional area of the second cavity body is gradually reduced from one end close to the first cavity body to one end far away from the first cavity body. By means of the arrangement, refraction and reflection of sound waves in the front sound cavity are smoother, interaction of the sound waves in the refraction and reflection process is reduced, and therefore the sound waves are not prone to distortion.

Description

Technical Field

[0001] This application relates to the field of electronic product technology, and in particular to an electronic device. Background Technology

[0002] Loudspeakers, as a commonly used electroacoustic transducer, are an indispensable part of electronic devices. The main working principle of a loudspeaker is to use an electrically driven element to drive a diaphragm to produce mechanical vibration, which in turn pushes the surrounding air, causing fluctuations in the air medium and thus achieving the conversion from electricity to sound. The loudspeaker's front cavity diaphragm and the outer casing of the electronic device constitute a loudspeaker sound outlet channel, also known as the front acoustic chamber. Different front acoustic chamber shapes will have different effects on the sound quality of the loudspeaker.

[0003] As electronic devices develop towards miniaturization and extreme stacking designs, how to reduce acoustic distortion of the front acoustic cavity and lower the THD (Total Harmonic Distortion) value of the front acoustic cavity under extremely narrow sound outlet channels has become an urgent technical problem to be solved. Summary of the Invention

[0004] In view of this, this application provides an electronic device that can reduce acoustic distortion in the front acoustic cavity and improve the sound quality of the electronic device.

[0005] Specifically, the following technical solutions are included:

[0006] This application provides an electronic device, which includes a mid-frame and a speaker assembly disposed within the mid-frame. The mid-frame has a sound output channel for communicating with the outside world, and the speaker assembly includes a speaker body with a diaphragm.

[0007] The speaker body and the side wall of the sound outlet channel form a front sound cavity. The front sound cavity includes a first cavity and a second cavity that are interconnected. The first cavity is directly opposite the diaphragm, and the second cavity is located at one end of the first cavity. The cross-sectional area of ​​the second cavity gradually decreases from the end closer to the first cavity to the end farther away from the first cavity.

[0008] In an optional embodiment, the middle frame has a front wall, which is a side wall surface in the sound outlet channel that is directly opposite the diaphragm, and the front wall extends in a planar shape and is parallel to the extension direction of the diaphragm;

[0009] The first cavity has a cross-sectional area of ​​S1 at the front wall, and the second cavity has a maximum cross-sectional area of ​​Smax, satisfying that S1 > Smax.

[0010] In an optional embodiment, the electronic device further satisfies:

[0011] 1 / 3S1 < Smax.

[0012] In an optional embodiment, the length of the diaphragm in the first direction is L1, and the length of the connection between the second cavity and the front wall and the end of the diaphragm near the second cavity in the first direction is L2, satisfying:

[0013] 1 / 3L1 < L2 < 1 / 2L1.

[0014] In an optional embodiment, the distance between the front wall and the diaphragm in its stationary state is H1, and the maximum amplitude of the diaphragm is H2, satisfying:

[0015] H1 > H2.

[0016] In an optional embodiment, the second cavity includes a plurality of sequentially connected pipe segments, the cross-sectional area of ​​each pipe segment gradually decreasing from one end near the first cavity to the end away from the first cavity, and the plurality of pipe segments are smoothly connected in sequence.

[0017] In an optional embodiment, at least two adjacent pipe segments have different extension lengths.

[0018] In an optional embodiment, at least two adjacent pipe segments extend in different directions.

[0019] In an optional embodiment, the second cavity is provided with a breathable and waterproof component.

[0020] In an optional embodiment, the loudspeaker assembly further includes a housing, in which the loudspeaker body is housed, and the side of the loudspeaker body opposite to the diaphragm is formed with the housing to create a rear acoustic cavity.

[0021] In an optional embodiment, the housing includes a front housing portion and a rear housing portion that are joined together, the speaker body on the side opposite to the diaphragm and the rear housing portion forming the rear acoustic cavity, and the front housing portion being located on the side of the rear housing portion closer to the sound outlet channel.

[0022] In an alternative embodiment, the electronic device further includes a screen assembly, with the end of the sound output channel located at the edge of the screen assembly.

[0023] The beneficial effects of the technical solution provided in this application embodiment include at least the following: by setting the cross-sectional area of ​​the second cavity to gradually decrease from the end near the first cavity to the end far from the first cavity, and adopting a gradient cross-section design, the cross-sectional area of ​​the front sound cavity is more closely integrated with the wavefront of the sound wave, the refraction and reflection of the sound wave in the front sound cavity is smoother, the interaction of the sound wave in the refraction and reflection process is reduced, and thus the sound wave is less likely to produce distortion, which is beneficial to reduce the acoustic distortion of the front sound cavity, reduce the THD value of the front sound cavity, and improve the sound quality of electronic devices. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 Schematic diagrams of the structures of some electronic devices provided in the embodiments of this application;

[0026] Figure 2 Schematic diagrams of other electronic devices provided in the embodiments of this application;

[0027] Figure 3 Figure 1 is one of the schematic diagrams comparing the results of distortion simulation test. Figure 2 shows a schematic diagram of the front acoustic cavity structure with a conventional rectangular cross section, Figure 3 shows a schematic diagram of the front acoustic cavity structure with a funnel-shaped gradient cross section, and Figure 4 shows a comparison curve of the results obtained by performing distortion simulation test on the front acoustic cavity structures corresponding to Figure 2 and Figure 4.

[0028] Figure 4 The second diagram shows the comparison of distortion simulation test results. Figures (d), (e), and (f) are schematic diagrams of the front sound cavity structure in the prior art that does not have a funnel-shaped gradient cross section. Figures (g) and (h) are schematic diagrams of the two front sound cavities provided in the embodiments of this application. Figure (i) is a comparison curve of the results obtained by performing distortion simulation tests on the front sound cavity structures corresponding to Figures (d) to (h).

[0029] Figure 5 This is a schematic diagram of the front acoustic cavity provided in some embodiments of this application.

[0030] The reference numerals in the figure are respectively:

[0031] 1-Middle frame; 11-Sound outlet; 111-Narrow slit; 112-Front wall;

[0032] 2-Speaker assembly; 21-Speaker body; 211-Diaphragm; 22-Front acoustic chamber; 221-First cavity; 222-Second cavity; 2221-Tube section; 23-Rear acoustic chamber; 24-Housing shell; 241-Front shell section; 242-Rear shell section;

[0033] 3- Breathable and waterproof components;

[0034] 4-Screen components.

[0035] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] The directional terms used in the embodiments of this application, such as "up," "down," and "side," are generally based on the relative relationships shown in the figures. These directional terms are used merely to more clearly describe the relationships between structures, not to describe absolute directions. When the product is placed in different orientations, the orientation may change; for example, "up" and "down" may be interchanged.

[0038] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art.

[0039] Loudspeakers, as a commonly used electroacoustic transducer, are an indispensable part of electronic devices. The main working principle of a loudspeaker is to use an electrically driven element to drive a diaphragm to produce mechanical vibration, which in turn pushes the surrounding air, causing fluctuations in the air medium and thus achieving the conversion from electricity to sound. The loudspeaker's front cavity diaphragm and the outer casing of the electronic device constitute a loudspeaker sound outlet channel, also known as the front acoustic chamber. Different front acoustic chamber shapes will have different effects on the sound quality of the loudspeaker.

[0040] As electronic devices develop towards miniaturization and extreme stacking designs, how to reduce acoustic distortion and lower the THD value of the front acoustic cavity under extremely narrow sound outlet channels has become an urgent technical problem to be solved.

[0041] Therefore, in order to solve the above-mentioned technical problems, this application provides an electronic device that can reduce the acoustic distortion of the front acoustic cavity 22 and improve the sound quality of the electronic device.

[0042] To make the technical solutions and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0043] like Figure 1 As shown, the electronic device provided in this application embodiment includes a middle frame 1 and a speaker assembly 2 disposed in the middle frame 1. The middle frame 1 has a sound outlet channel 11 for communicating with the outside world, and the speaker assembly 2 includes a speaker body 21 having a diaphragm 211.

[0044] The speaker body 21 and the side wall of the sound outlet channel 11 form a front sound cavity 22. The front sound cavity 22 includes a first cavity 221 and a second cavity 222 that are connected to each other. The first cavity 221 is directly opposite the diaphragm 211, and the second cavity 222 is located at one end of the first cavity 221. The cross-sectional area of ​​the second cavity 222 gradually decreases from the end closer to the first cavity 221 to the end farther away from the first cavity 221.

[0045] It is understood that from the end closest to the first cavity 221 to the end furthest from the first cavity 221, the second cavity 222 may exhibit a gradually decreasing cross-sectional area throughout its entire section, or it may exhibit a gradually decreasing cross-sectional area in most sections. Any embodiment that satisfies the requirement that the second cavity 222 exhibits a gradually decreasing cross-sectional area in most sections falls within the protection scope of this application.

[0046] As is known to those skilled in the art, the main reason for distortion in the front acoustic cavity is that the back-and-forth vibration process of sound wave compression and expansion is not smooth, which leads to mutual interference of sound waves, causing sound field disorder and resulting in nonlinear acoustic distortion.

[0047] Since the vibration area of ​​the diaphragm 211 is limited and the sound wave propagates forward in the form of a spherical wavefront, the electronic device provided in this application embodiment adopts a front sound cavity 22 with a gradually changing cross-sectional area. The cross-sectional area of ​​the front sound cavity 22 is more closely integrated with the wavefront, the refraction and reflection of the sound wave are smoother, and it is less prone to distortion.

[0048] For example, electronic devices include, but are not limited to, mobile or fixed terminals with speakers such as mobile phones, tablets, digital broadcasting terminals, messaging devices, game consoles, medical devices, fitness equipment, personal digital assistants, smart wearable devices, smart TVs, and in-vehicle devices.

[0049] The middle frame 1 is used to support and house the components of the electronic device, providing support and protection for the internal components of the electronic device.

[0050] The sound outlet channel 11 is used to provide an airflow channel for the speaker assembly 2, such as Figure 1 As shown, the end of the sound output channel 11 is provided with a narrow slit 111. The sound output channel 11 transmits sound to the outside through the narrow slit 111, so that the electronic device can achieve good audio output effect while maintaining its aesthetics.

[0051] For example, the middle frame 1 also has a receiving cavity for accommodating the speaker assembly 2, and the receiving cavity is connected to the sound outlet channel 11.

[0052] The speaker assembly 2 drives the diaphragm 211 to vibrate, thereby pushing the air and causing the air medium to fluctuate, thus producing sound.

[0053] like Figure 1 As shown, the first direction X is horizontal, and the second direction Y is vertical. The first direction X and the second direction Y are perpendicular to each other. Furthermore, the direction perpendicular to the plane of the paper is denoted as the third direction. The third direction is perpendicular to both the first direction X and the second direction Y. Figure 1 and Figure 2 This is a partial structural diagram of the electronic device used for observation along a third direction.

[0054] like Figure 1 As shown, the lower surface of the speaker body 21 and the side wall of the sound outlet channel 11 form a front sound cavity 22. Exemplarily, the first cavity 221 extends along the first direction X, the first cavity 221 is opposite to the diaphragm 211 and is located on one side of the diaphragm 211 in the second direction Y, the second cavity 222 is located at one end of the first cavity 221 in the first direction X, and the extension direction of the second cavity 222 is inclined to the extension direction of the first cavity 221.

[0055] like Figure 1 As shown, the first end of the second cavity 222 is connected to the first cavity 221, and the second end of the second cavity 222 is connected to the narrow slit 111. The cross-sectional area of ​​the second cavity 222 gradually decreases from the first end to the second end, forming a cavity structure similar to a cone or funnel.

[0056] It should be noted that the first end and the second end of the second cavity 222 are two opposite ends in the extending direction of the second cavity 222; the cross-sectional area of ​​the second cavity 222 is calculated using a perpendicular line... Figure 1 The area of ​​the cross section obtained by cutting the paper surface with a plane can be specifically the area of ​​the cross section obtained by cutting with a plane perpendicular to the extension direction of the second cavity 222.

[0057] For example, the first end of the second cavity 222 is smoothly connected to the first cavity 221, that is, there is no abrupt change in cross section at the connection between the first cavity 221 and the second cavity 222. The shape and size of the end of the first cavity 221 used to connect with the second cavity 222 are the same as the shape and size of the first end of the second cavity 222.

[0058] For example, the inner wall of the second cavity 222 smoothly transitions along the extension direction of the second cavity 222, eliminating the edge corners of the front sound cavity 22 in the prior art, so that the second cavity 222 gradually transitions from a large cross section to a small cross section, allowing the sound waves to transition smoothly, which can reduce distortion to a large extent and reduce the THD value.

[0059] To further verify the analysis, the applicant conducted distortion simulation experiments on the front acoustic cavity 22 with a conventional rectangular cross-section and the front acoustic cavity 22 with a funnel-shaped gradually changing cross-section. For example... Figure 3 As shown, the front acoustic cavity 22 with a conventional rectangular cross-section is taken as case 1, and the front acoustic cavity 22 with a funnel-shaped gradient cross-section is taken as case 2. The distortion simulation results show that the THD value of case 2 is significantly lower than that of case 1. This means that the distortion reduction effect of the front acoustic cavity 22 with the funnel-shaped gradient cross-section is significantly better than that of the front acoustic cavity 22 with a conventional rectangular cross-section. Figure 3 In the middle figure (c), the horizontal axis represents frequency in Hz, and the vertical axis represents THD value as a percentage.

[0060] The electronic device provided in this application embodiment has a gradually decreasing cross-sectional area of ​​the second cavity 222 from the end near the first cavity 221 to the end away from the first cavity 221. This gradual cross-sectional design makes the cross-sectional area of ​​the front acoustic cavity 22 more compatible with the wavefront of the sound wave, and the reflection and refraction of the sound wave in the front acoustic cavity 22 are smoother. This reduces the interaction of the sound wave during the reflection and refraction process, making the sound wave less prone to distortion. This helps to reduce the acoustic distortion of the front acoustic cavity 22, lower the THD value of the front acoustic cavity 22, and improve the sound quality of the electronic device.

[0061] Furthermore, such as Figure 1 As shown, the middle frame 1 has a front wall 112, which is the side wall surface in the sound outlet channel 11 that is directly opposite the diaphragm 211, and the front wall 112 extends in a planar shape.

[0062] In an optional embodiment, the front wall 112 is inclined to the diaphragm 211 in its resting state, and the front wall 112 is the inner wall surface of the second cavity 222. In this embodiment, the second cavity 222 is located at one end of the first cavity 221 in the first direction X, the cross-section of the largest end of the second cavity 222 faces the diaphragm 211, the cross-sectional area of ​​the second cavity 222 changes with a large gradient, and the front sound cavity 22 exhibits... Figure 5The shape of the middle figure (h).

[0063] In another alternative embodiment, such as Figure 1 As shown, the front wall 112 is parallel to the extension direction of the diaphragm 211, that is, the front wall 112 is parallel to the diaphragm 211 in its static state. The cross-sectional area of ​​the first cavity 221 at the front wall 112 is S1, and the maximum cross-sectional area of ​​the second cavity 222 is Smax, satisfying: S1 > Smax. It can be understood that the cross-sectional area of ​​the first cavity 221 at the front wall 112 is the area of ​​the cross-section obtained by cutting with a plane perpendicular to the extension direction of the first cavity 221 and intersecting the front wall 112.

[0064] In this embodiment, the cross-sectional area of ​​the first cavity 221 is equal at all points on the front wall 112, and the maximum cross-sectional area Smax of the second cavity 222 is less than the cross-sectional area S1 of the first cavity 221 at the front wall 112. This ensures that the cross-sectional area of ​​the second cavity 222 gradually decreases from the end facing the diaphragm 211, and the gradient of the cross-sectional area change is small, thus ensuring that the front sound cavity 22 has a good distortion reduction effect.

[0065] To further verify the analysis, distortion simulation tests were conducted on the front acoustic cavity structures (case3, case4 and case5) in the three existing technologies and the two front acoustic cavities 22 (case6 and case7) provided in the embodiments of this application.

[0066] like Figure 4 As shown, cases 3, 4 and 5 do not have a funnel-shaped gradient cross section, while cases 6 and 7 have a funnel-shaped gradient cross section. In case 6, the front wall 112 is parallel to the extension direction of the diaphragm 211, and the gradient of the cross-sectional area of ​​the second cavity 222 is relatively small. In case 7, the front wall 112 is inclined to the extension direction of the diaphragm 211, and the gradient of the cross-sectional area of ​​the second cavity 222 is relatively large.

[0067] The comparison curves of the distortion simulation results show that case 6 has a smaller THD value at most frequencies, and has the best distortion reduction effect; case 7 has a smaller THD value at frequencies above 1300Hz.

[0068] according to Figure 4 It can also be seen that, in order to better reduce distortion, the cross-sectional area of ​​the front acoustic cavity 22 should not change too drastically, and abrupt changes in the cross-section, similar to those in case 3 and case 4, should be avoided; and the gradient of the cross-sectional area change of the second cavity 222 should not be too large. For example, the gradient of the cross-sectional area change of the second cavity 222 in case 7 is larger than that in case 6, and the sound wave distortion in case 7 is greater than that in case 6, which makes the distortion reduction effect of case 7 less than that of case 6.

[0069] In a further embodiment, the electronic device also satisfies:

[0070] 1 / 3S1 < Smax.

[0071] That is, the cross-sectional area S1 of the first cavity 221 at the front wall 112 and the maximum cross-sectional area Smax of the second cavity 222 satisfy:

[0072] 1 / 3S1 < Smax < S1.

[0073] This design avoids the second cavity 222 having too small a maximum cross-sectional area, which would affect the propagation of sound waves in the front acoustic cavity 22, while ensuring that the front acoustic cavity 22 has the best distortion reduction effect.

[0074] For example, the cross-sectional area S1 of the first cavity 221 at the front wall 112 satisfies:

[0075] S1 = H1T1.

[0076] Please refer to the following: Figure 5 H1 is the distance between the front wall 112 and the diaphragm 211 in the second direction Y, and T1 (not shown in the figure) is the extension length of the first cavity 221 in the third direction.

[0077] For example, the maximum cross-sectional area Smax of the second cavity 222 satisfies:

[0078] Smax = L3T2.

[0079] Among them, such as Figure 5 As shown, L3 is the length of the line connecting the two ends of the second cavity 222 at the maximum cross-sectional area, and T2 (not shown in the figure) is the extension length of the second cavity 222 at the maximum cross-sectional area in the third direction.

[0080] In one embodiment, please refer to Figure 5 The length of the diaphragm 211 in the first direction X is L1, and the length of the connection between the second cavity 222 and the front wall 112 and the end of the diaphragm 211 near the second cavity 222 in the first direction X is L2, satisfying:

[0081] 1 / 3L1 < L2 < 1 / 2L1.

[0082] In practice, due to the complex structure and small volume of the middle frame 1, it may be difficult or impossible to effectively measure L3, resulting in the inability to verify the actual numerical relationship between S1 and Smax. Since L1 and L2 are easier to measure, in this case, L1 and L2 should be guaranteed to satisfy the above numerical relationship to reduce the acoustic distortion of the front acoustic cavity 22.

[0083] If L3 can be accurately measured and S1 and Smax can be guaranteed to meet the design requirements, then the constraint condition 1 / 3L1<L2<1 / 2L1 does not need to be met.

[0084] In one embodiment, please refer to Figure 5 Electronic devices also meet the following requirements:

[0085] H1 > H2.

[0086] H2 is the maximum amplitude of the diaphragm 211, which is the maximum distance that the diaphragm 211 moves relative to the equilibrium position during the vibration along the second direction Y. The equilibrium position is the position of the diaphragm 211 when it is at rest.

[0087] This configuration ensures that motion interference between the front wall 112 and the diaphragm 211 is avoided, preventing nonlinear distortion in the speaker assembly 2. Furthermore, H1 should also meet the minimum requirements of other rigid stacking conditions. If H1 is too large, the volume of the first cavity 221 in front of the diaphragm 211 may be much larger than the volumes of other areas, leading to interference from reflected sound waves and increased acoustic nonlinear distortion.

[0088] The extension length L4 of the narrow slit 111 has little effect on the overall distortion peak of the front acoustic cavity 22, but it will affect the resonance peak (Fh) value of the front acoustic cavity 22. If Fh is too low, it will affect the acoustic performance of the speaker assembly 2. Different products have different requirements for Fh. The specific value of L4 should be determined according to the actual product to meet the design requirements of the resonance peak. This application does not make specific limitations.

[0089] The extension length L5 of the second cavity 222 will also affect the resonance peak of the front sound cavity 22. The specific value of L5 should be determined according to the actual product to meet the design requirements of the resonance peak, and this application does not make a specific limitation. Within the range of L5, the design requirement that the cross-sectional area of ​​the second cavity 222 gradually decreases from the end closer to the first cavity 221 to the end farther away from the first cavity 221 must be met, and there should be no abrupt change in cross-sectional area or a situation where the cross-sectional area is large or small.

[0090] Based on any of the above embodiments, the second cavity 222 includes a plurality of pipe segments 2221 connected in sequence.

[0091] Specifically, multiple pipe segments 2221 are connected in sequence from the direction close to the first cavity 221 to the direction away from the first cavity 221, while still satisfying the design requirement that the cross-sectional area of ​​the second cavity 222 gradually decreases from the end close to the first cavity 221 to the end away from the first cavity 221.

[0092] In some electronic devices, the internal stacking is quite complex. In this case, by setting the second cavity 222 to include multiple tube segments 2221, it is possible to adapt to the complex stacking space, while ensuring that the second cavity 222 has a gradient cross section, thereby improving the distortion reduction effect of the front sound cavity 22.

[0093] The number of pipe segments 2221 can be set according to the actual situation, for example... Figure 2 As shown, the second cavity 222 includes two pipe sections 2221.

[0094] Furthermore, the cross-sectional area of ​​each pipe segment 2221 gradually decreases from the end closest to the first cavity 221 to the end furthest from the first cavity 221, and multiple pipe segments 2221 are smoothly connected in sequence.

[0095] In this context, "smooth connection between multiple pipe segments 2221" means that there is no abrupt change in cross-section at the connection between two adjacent pipe segments 2221, for example... Figure 2 As shown, the end of the upper pipe segment 2221 has the same shape and size as the beginning of the lower pipe segment 2221.

[0096] This configuration ensures that the cross-sectional area of ​​each tube segment 2221 maintains a funnel-shaped gradual change trend and that there are no abrupt changes in cross-section in the second cavity 222. This makes it less likely for sound waves to be distorted, which helps to reduce the acoustic distortion of the front sound cavity 22, lower the THD value of the front sound cavity 22, and improve the sound quality of electronic devices.

[0097] In one embodiment, at least two adjacent pipe segments 2221 have different extension lengths.

[0098] By setting at least two adjacent pipe segments 2221 with different extension lengths, at least two adjacent pipe segments 2221 can have different cross-sectional area change gradients, which is beneficial for the front sound cavity 22 to adapt to the complex stacked space.

[0099] In one embodiment, at least two adjacent pipe segments 2221 extend in different directions.

[0100] For example Figure 2 As shown, the two pipe sections 2221 extend at an angle, and the angle is obtuse.

[0101] In some electronic devices, the internal stacking is complex and the stacking space is small, making it difficult to ensure that the second cavity 222 extends in a straight line. In this case, by setting the extension directions of at least two adjacent tube segments 2221 to be inclined to each other, it is possible to adapt to the relatively narrow stacking space while ensuring that the second cavity 222 has sufficient extension length to avoid affecting the sound quality of the electronic device.

[0102] In one embodiment, a breathable and waterproof component 3 is provided in the second cavity 222.

[0103] For example, the breathable and waterproof component 3 includes a mesh fabric, a grid, etc.

[0104] This design prevents water or debris from entering the sound outlet channel 11, thus protecting the speaker assembly 2.

[0105] In one embodiment, the loudspeaker assembly 2 further includes a housing 24, in which a loudspeaker body 21 is housed, and the side of the loudspeaker body 21 facing away from the diaphragm 211 is formed with the housing 24 to create a rear acoustic cavity 23.

[0106] like Figure 1 or Figure 2 As shown, the housing 24 is located within the middle frame 1. The upper side of the speaker body 21 and the inner wall of the housing 24 form a rear acoustic cavity 23. The rear acoustic cavity 23 is located on the side of the speaker body 21 away from the front acoustic cavity 22, and the rear acoustic cavity 23 is separated from the front acoustic cavity 22. The rear acoustic cavity 23 has the functions of preventing acoustic short circuits, enhancing the power of low-frequency sound, and optimizing sound quality.

[0107] In one specific embodiment, the housing 24 includes a front housing portion 241 and a rear housing portion 242 that are connected together. The side of the speaker body 21 away from the diaphragm 211 and the rear housing portion 242 are arranged to form a rear sound cavity 23. The front housing portion 241 is located on the side of the rear housing portion 242 that is close to the sound outlet channel 11.

[0108] like Figure 1 or Figure 2 As shown, the front shell portion 241 and the rear shell portion 242 are joined along the second direction Y, specifically by means of bonding, snap-fit ​​connection, threaded fastener connection, etc. Alternatively, the front shell portion 241 and the rear shell portion 242 are integrally formed.

[0109] For example, the front shell 241 and the rear shell 242 are made of metal materials, such as steel shells.

[0110] In one embodiment, the electronic device further includes a screen assembly 4, with the end of the sound channel 11 located at the edge of the screen assembly 4.

[0111] like Figure 1 or Figure 2 As shown, the screen assembly 4 is located on the third-side upward side of the middle frame 1. The front sound cavity 22 is closer to the screen assembly 4 than the rear sound cavity 23. The narrow slit 111 is located at the outer edge of the screen assembly 4, so that the electronic device can achieve good audio output while maintaining its aesthetics.

[0112] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0113] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0114] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An electronic device, characterized in that, The electronic device includes a middle frame (1) and a speaker assembly (2) disposed within the middle frame (1). The middle frame (1) has a sound outlet channel (11) for communicating with the outside world. The speaker assembly (2) includes a speaker body (21) having a diaphragm (211). The speaker body (21) and the side wall of the sound outlet channel (11) form a front sound cavity (22). The front sound cavity (22) includes a first cavity (221) and a second cavity (222) that are interconnected. The first cavity (221) is directly opposite the diaphragm (211). The second cavity (222) is located at one end of the first cavity (221). The cross-sectional area of ​​the second cavity (222) gradually decreases from the end closer to the first cavity (221) to the end farther away from the first cavity (221).

2. The electronic device according to claim 1, characterized in that, The middle frame (1) has a front wall (112), which is the side wall surface in the sound outlet channel (11) that is directly opposite the diaphragm (211). The front wall (112) extends in a planar shape and is parallel to the extension direction of the diaphragm (211). The first cavity (221) has a cross-sectional area of ​​S1 at the front wall (112), and the second cavity (222) has a maximum cross-sectional area of ​​Smax, satisfying: S1 > Smax.

3. The electronic device according to claim 2, characterized in that, The electronic device also satisfies: 1 / 3S1 < Smax.

4. The electronic device according to claim 2, characterized in that, The length of the diaphragm (211) in the first direction (X) is L1, and the length of the connection between the second cavity (222) and the front wall (112) and the end of the diaphragm (211) near the second cavity (222) in the first direction (X) is L2, satisfying: 1 / 3L1 < L2 < 1 / 2L1.

5. The electronic device according to claim 2, characterized in that, The distance between the front wall (112) and the diaphragm (211) in a stationary state is H1, and the maximum amplitude of the diaphragm (211) is H2, satisfying: H1 > H2.

6. The electronic device according to any one of claims 1 to 5, characterized in that, The second cavity (222) includes a plurality of pipe segments (2221) connected in sequence. The cross-sectional area of ​​each pipe segment (2221) gradually decreases from one end near the first cavity (221) to one end away from the first cavity (221), and the plurality of pipe segments (2221) are smoothly connected in sequence.

7. The electronic device according to claim 6, characterized in that, At least two adjacent pipe segments (2221) have different extension lengths.

8. The electronic device according to claim 6, characterized in that, At least two adjacent pipe segments (2221) extend in different directions.

9. The electronic device according to claim 1, characterized in that, The second cavity (222) is provided with a breathable and waterproof component (3).

10. The electronic device according to claim 1, characterized in that, The loudspeaker assembly (2) further includes a housing (24), in which the loudspeaker body (21) is housed, and the side of the loudspeaker body (21) facing away from the diaphragm (211) and the housing (24) surrounds to form a rear acoustic cavity (23).

11. The electronic device according to claim 10, characterized in that, The housing (24) includes a front housing portion (241) and a rear housing portion (242) that are connected together. The speaker body (21) is arranged with the rear housing portion (242) on the side away from the diaphragm (211) to form the rear sound cavity (23). The front housing portion (241) is located on the side of the rear housing portion (242) near the sound outlet channel (11).

12. The electronic device according to claim 1, characterized in that, The electronic device also includes a screen assembly (4), and the end of the sound output channel (11) is located at the edge of the screen assembly (4).

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