Electronic device and middle frame

Abstract

This application relates to the field of audio technologies, and in particular, to an electronic device and a middle frame. The electronic device includes a middle frame, a display, and a speaker module, the display is mounted on a side of the middle frame, a sound outlet channel is formed between the display and the middle frame, the middle frame is provided with a communication hole, the communication hole communicates with the sound outlet channel, the speaker module is mounted on a side that is of the middle frame and that faces away from the display, and a sound emitted by the speaker module enters the sound outlet channel through the communication hole. The electronic device includes an avoidance region and a flow-guiding portion, and the flow-guiding portion is located between the communication hole and the avoidance region. The provided flow-guiding portion is configured to guide a flow, so that the flow-guiding portion guides air in the sound outlet channel, to reduce a maximum flow speed of air in the sound outlet channel, so as to reduce noise generation. This helps improve sound quality of the electronic device, without affecting another structure of the electronic device. In other words, this facilitates a miniaturization design of the electronic device, and enhances user experience.

Description

[0001] This application claims priority to Chinese Patent Application No. 202420633459.4, filed with the China National Intellectual Property Administration on March 28, 2024 and entitled "ELECTRONIC DEVICE AND MIDDLE FRAME", which is incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] This application relates to the field of audio technologies, and in particular, to an electronic device and a middle frame.BACKGROUND

[0003] In electronic products such as mobile phones and tablet computers, a micro speaker is usually used for sound emission, but airflow noise is always a common problem for the micro speaker. Especially, when a piano-type sound is played, impact of airflow in a front cavity causes "hissing" noise, degrading user experience. In a conventional manner, noise is usually reduced by increasing a sound outlet area. However, the sound outlet area is likely to be limited by a size and a structure of an electronic device, and a speaker still cannot fully meet a requirement of reducing noise. As a result, in the conventional technology, it is difficult to meet a requirement for both miniaturization and high sound quality of the electronic device.SUMMARY

[0004] An objective of embodiments of this application is to provide an electronic device and a middle frame. The electronic device can meet a requirement for both miniaturization and high sound quality.

[0005] According to a first aspect, an embodiment of this application provides an electronic device. The electronic device includes a middle frame, a display, and a speaker module, the display is mounted on a side of the middle frame, a sound outlet channel is formed between the display and the middle frame, the middle frame is provided with a communication hole, the communication hole communicates with the sound outlet channel, the speaker module is mounted on a side that is of the middle frame and that faces away from the display, and a sound emitted by the speaker module enters the sound outlet channel through the communication hole. The electronic device includes an avoidance region and a flow-guiding portion, the sound outlet channel surrounds the avoidance region, and the flow-guiding portion is located between the communication hole and the avoidance region.

[0006] For example, the sound outlet channel may be disposed around the avoidance region. Because the sound outlet groove is provided around the avoidance region, an airflow narrowing region is likely to occur around the avoidance region. When air flows in the airflow narrowing region, a flow speed is likely to be excessively high or an eddy is likely to be generated, which generates noise.

[0007] When a diaphragm vibrates, air in a sound inlet channel and the sound outlet channel is driven by the diaphragm to vibrate. An example in which the diaphragm pushes air is used. Air moves from the diaphragm toward the communication hole, and diffuses from the communication hole to the sound outlet channel. In the sound outlet channel, because the flow-guiding portion is located between the avoidance region and the communication hole, a part of air directly flows out of a sound outlet opening, and a part of air first comes into contact with the flow-guiding portion, slightly changes a movement direction, and then flows out of the sound outlet opening after passing through the avoidance region. It may be understood that, the flow-guiding portion can guide air toward a region with low air density to reduce air density in the airflow narrowing region, to reduce a flow speed of air in the airflow narrowing region, so as to reduce noise. In addition, the flow-guiding portion can make a flow path of air in the sound outlet channel more smooth, which helps reduce eddy generation, to reduce noise.

[0008] In this embodiment, the provided flow-guiding portion is configured to guide a flow, so that the flow-guiding portion guides air in the sound outlet channel, to reduce a maximum flow speed of air in the sound outlet channel, so as to reduce noise generation. This helps improve sound quality of the electronic device during sound emission, to improve sound quality of the electronic device, without affecting another structure of the electronic device. In other words, this facilitates a miniaturization design of the electronic device, and enhances user experience.

[0009] In some implementations, the sound outlet channel includes a first wall surface, a second wall surface, and a third wall surface, the second wall surface is disposed opposite to the first wall surface, and the third wall surface is connected between the first wall surface and the second wall surface. The communication hole is provided corresponding to a connection between the second wall surface and the third wall surface, and the avoidance region is located between the first wall surface and the second wall surface. The sound outlet channel is further provided with a sound outlet opening, and the sound outlet opening is at least partially located on the first wall surface.

[0010] In the implementations, a structure of the sound outlet channel is disposed, which facilitates use of a space around the avoidance region, and helps increase a volume of the sound outlet channel. In addition, the speaker module is arranged in a length direction and a width direction of the electronic device. This helps reduce a thickness space of the electronic device, and therefore facilitates thinning of the electronic device.

[0011] In some implementations, the flow-guiding portion is a boss, and a surface that is of the flow-guiding portion and that faces the communication hole is a curved surface.

[0012] In the implementations, such a structure of the flow-guiding portion helps the flow-guiding portion directly guide air movement, and a flow-guiding surface being a curved surface can also reduce an eddy during airflow, to reduce noise generation.

[0013] In some implementations, the electronic device further includes a flow-leading portion, the flow-leading portion is a boss, the flow-guiding portion protrudes from a boss surface of the flow-leading portion, and the surface that is of the flow-guiding portion and that faces the communication hole is close to the avoidance region relative to a surface that is of the flow-leading portion and that faces the communication hole.

[0014] In the implementations, the flow-leading portion is disposed, and the flow-leading portion is configured to assist in flow guiding, to reduce the maximum flow speed of air in the sound outlet channel, so as to reduce noise generation.

[0015] In some implementations, the flow-guiding portion is attached to the avoidance region.

[0016] In the implementations, because the flow-guiding portion is attached to the avoidance region, and there is no gap between the flow-guiding portion and the avoidance region, in the sound outlet channel, no gas flow channel is formed between the flow-guiding portion and the avoidance region. In this case, the structure of the sound outlet channel is simple, which facilitates airflow in the sound outlet channel.

[0017] In some implementations, the flow-guiding portion is located at an edge of the communication hole.

[0018] In the implementations, the flow-guiding portion may guide air at the communication hole, so that air can be guided at a start position of the sound outlet channel, making it easier to change a flow direction of air.

[0019] In some implementations, the flow-guiding portion includes a plurality of flow-guiding pillars, the plurality of flow-guiding pillars are spaced from each other, a spacing between at least two adjacent flow-guiding pillars is less than a spacing between other adjacent flow-guiding pillars, and a spacing between at least a part of flow-guiding pillars on a side close to the avoidance region is less than a spacing between at least a part of flow-guiding pillars on a side away from the avoidance region.

[0020] In the implementations, the plurality of flow-guiding pillars are disposed, and spacings between flow-guiding pillars are set, so that a flow direction of air can be guided more delicately based on a shape of the sound outlet channel, to reduce noise generation.

[0021] In some implementations, the flow-guiding portion is mesh fabric, the mesh fabric is fastened to the middle frame, hole sizes of mesh holes of the mesh fabric are uneven, and a hole size of at least a part of mesh holes on a side that is of the mesh fabric and that is close to the avoidance region is less than a hole size of at least a part of mesh holes on a side that is of the mesh fabric and that is away from the avoidance region.

[0022] For example, the middle frame may be provided with a plurality of mounting pillars, the plurality of mounting pillars are located on a periphery of the communication hole, and the mesh fabric, namely, the flow-guiding portion, may be bonded to the mounting pillars, to fasten the flow-guiding portion.

[0023] In the implementations, the flow-guiding portion is disposed as mesh fabric, and the flow-guiding portion is provided with mesh holes with uneven hole sizes, so that the flow direction of air can be guided more delicately based on the shape of the sound outlet channel, to reduce noise generation.

[0024] In some implementations, the sound outlet opening is formed by a gap between an edge of the middle frame and an edge of the display, and a length-width ratio of the sound outlet opening is greater than or equal to 10.

[0025] In the implementations, the sound outlet opening is simple to form, and has little impact on structures of the display and the middle frame. This helps simplify a manufacturing process and improve structure strength of the electronic device. In addition, the sound outlet opening has a large length-width ratio. This helps increase a sound outlet area of the sound outlet opening, to reduce noise.

[0026] In some implementations, the flow-guiding portion and the middle frame are an integrally formed mechanical part.

[0027] In the implementations, the flow-guiding portion and the middle frame are an integrally formed mechanical part. This facilitates formation of the flow-guiding portion during manufacturing of the middle frame, to improve connection reliability of the flow-guiding portion and simplify assembly of the electronic device.

[0028] In the implementations, the speaker module includes a diaphragm, and the diaphragm is disposed toward the communication hole.

[0029] In some implementations, because the diaphragm faces the communication hole, a spacing between the diaphragm and the communication hole is small, a path is straight, and a sound emitted by the diaphragm is easily propagated to the communication hole and then enters the sound outlet channel. This has little impact on sound quality of the sound emitted by the diaphragm, and helps improve sound quality of the electronic device.

[0030] In some implementations, an area of the communication hole is greater than or equal to one-eighth of an area of the diaphragm.

[0031] For example, the area of the communication hole may be a quarter of the area of the diaphragm of the speaker module.

[0032] In the implementations, the communication hole has a large area, and has little impact on sound quality of the speaker module. In addition, providing the communication hole has little damage to a structure of a bottom wall of a second mounting groove, and the bottom wall of the second mounting groove is reliable in fastening of the speaker module.

[0033] In some implementations, a sound inlet channel is formed between the diaphragm and the middle frame, and the sound inlet channel communicates with the sound outlet channel through the communication hole.

[0034] In the implementations, the sound inlet channel and the sound outlet channel may communicate with each other through the communication hole, to form a complete cavity space. In this case, both the sound inlet channel and the sound outlet channel are equivalent to a front cavity of the speaker module, so that the front cavity of the speaker module has a large volume, to mitigate impact on sound quality of the electronic device.

[0035] In some implementations, the electronic device further includes a front-facing camera, and at least a part of a structure of the front-facing camera is mounted in the avoidance region; and / or the sound outlet channel is disposed around the avoidance region.

[0036] In the implementations, the sound outlet channel surrounds the avoidance region, and the space around the avoidance region is used, so that the sound outlet channel has a large area, which is equivalent to that the speaker module has a front cavity with a large area. This reduces a flow speed of air flowing in the front cavity, and helps reduce noise of the electronic device when the speaker module emits a sound.

[0037] According to a second aspect, an embodiment of this application provides a middle frame. The middle frame is provided with a first mounting groove and a second mounting groove, the first mounting groove and the second mounting groove are located on two sides of the middle frame that face away from each other, the first mounting groove is used for mounting of a display, and the second mounting groove is used for mounting of a speaker module. The middle frame is further provided with a sound outlet groove and a communication hole, the sound outlet groove is configured to form a sound outlet channel with the display, and the communication hole runs through the middle frame and communicates with the sound outlet groove. The middle frame is further provided with a mounting hole and a flow-guiding portion, the mounting hole runs through the middle frame and is surrounded by the sound outlet groove, and the flow-guiding portion protrudes from a bottom wall of the sound outlet groove and is located between the communication hole and the mounting hole.

[0038] In this embodiment, when the middle frame is used in an electronic device, the flow-guiding portion is configured to guide a flow, and the sound outlet groove is configured to form the sound outlet channel with the display. The flow-guiding portion is disposed, so that the flow-guiding portion guides air in the sound outlet channel, to reduce a maximum flow speed of air in the sound outlet channel, so as to reduce noise generation. This helps improve sound quality of the electronic device during sound emission, to improve sound quality of the electronic device, without affecting another structure of the electronic device. In other words, this facilitates a miniaturization design of the electronic device, and enhances user experience.

[0039] In some implementations, the flow-guiding portion is a boss, and a surface that is of the flow-guiding portion and that faces the communication hole is a curved surface.

[0040] In the implementations, such a structure of the flow-guiding portion helps the flow-guiding portion directly guide air movement, and a flow-guiding surface being a curved surface can also reduce an eddy during airflow, to reduce noise generation.

[0041] In some implementations, the middle frame further includes a flow-leading portion, the flow-leading portion is a boss, the flow-guiding portion protrudes from a boss surface of the flow-leading portion, and the surface that is of the flow-guiding portion and that faces the communication hole is close to the mounting hole relative to a surface that is of the flow-leading portion and that faces the communication hole.

[0042] In the implementations, the flow-leading portion is disposed, and the flow-leading portion is configured to assist in flow guiding, to reduce the maximum flow speed of air in the sound outlet channel, so as to reduce noise generation.BRIEF DESCRIPTION OF DRAWINGS

[0043] To describe technical solutions in embodiments of this application or in the background, the following describes accompanying drawings used in embodiments of this application or the background. FIG. 1 is a simplified diagram of a structure of a conventional speaker; FIG. 2 is a diagram of a structure of an electronic device according to an embodiment of this application; FIG. 3 is an exploded view of the electronic device shown in FIG. 2; FIG. 4 is a diagram of a partial structure of a middle frame shown in FIG. 3; FIG. 5 is a diagram of a partial structure of a middle frame shown in FIG. 3 from another viewpoint; FIG. 6 is a sectional view of a partial structure along A-A in FIG. 2; FIG. 7 is a simplified diagram of airflow in a sound inlet channel and a sound outlet channel of the electronic device shown in FIG. 2; FIG. 8 is a diagram of structures of the sound inlet channel and the sound outlet channel shown in FIG. 7; FIG. 9 is a diagram of structures of the sound inlet channel and the sound outlet channel shown in FIG. 8 from another viewpoint; FIG. 10 is a diagram of the sound inlet channel and the sound outlet channel of the electronic device that are shown in FIG. 7 in some other embodiments; FIG. 11 is a simulation diagram of flow speeds of air in the sound inlet channel and the sound outlet channel of the electronic device that are shown in FIG. 10; FIG. 12 is a comparison diagram of the simulation diagram of FIG. 11; FIG. 13 is a diagram of a structure of a middle frame of the electronic device shown in FIG. 3 in some other embodiments; and FIG. 14 is a diagram of a structure of a middle frame of the electronic device shown in FIG. 3 in still some other embodiments. DESCRIPTION OF EMBODIMENTS

[0044] The following describes embodiments of this application with reference to accompanying drawings in embodiments of this application.

[0045] In the descriptions of embodiments of this application, it should be noted that the terms "mounting" and "connection" should be understood in a broad sense unless there is a clear stipulation and limitation. For example, "connection" may be detachable connection, nondetachable connection, direct connection, or indirect connection through an intermediate medium. "A plurality of" means at least two.

[0046] Orientation terms mentioned in embodiments of this application, for example, "upper", "lower", "inner", "outer", "top", "bottom", and "side" are merely directions based on the accompanying drawings. Therefore, the orientation terms are used to better and more clearly describe and understand embodiments of this application, instead of indicating or implying that a specified apparatus or element should have a specific orientation, and be constructed and operated in the specific orientation. Therefore, the orientation terms cannot be understood as a limitation on embodiments of this application.

[0047] In embodiments of this application, a limitation on a relative position relationship is mentioned, for example, parallel, perpendicular, or aligned. These limitations are all defined based on a current technique level, but are not absolutely strict limitations. A small deviation is allowed, and being approximately parallel, approximately perpendicular, approximately aligned, or the like is allowed. For example, that A is parallel to B means that A is parallel or approximately parallel to B, and an included angle of 0 degrees to 10 degrees between A and B is allowed. For example, that A is perpendicular to B means that A is perpendicular or approximately perpendicular to B, and an included angle of 80 degrees to 100 degrees between A and B is allowed.

[0048] In embodiments of this application, the terms "first", "second", "third", and "fourth" are merely intended for a purpose of description, and shall not be understood as an indication or implication of relative importance or an implicit indication of a quantity of indicated technical features. Therefore, a feature limited by "first", "second", "third", or "fourth" may explicitly or implicitly include one or more features.

[0049] FIG. 1 is a simplified diagram of a structure of a conventional speaker.

[0050] A conventional speaker 1000 includes a diaphragm 1001, the diaphragm 1001 can divide a cavity of the speaker 1000 into a front cavity 1002 and a rear cavity 1003, the front cavity 1002 communicates with an external environment, the rear cavity 1003 generally does not directly communicate with the external environment, the diaphragm 1001 can vibrate to emit a sound, and the sound is transmitted to the outside through the front cavity 1002. When a structure of the speaker 1000 is designed, an airflow narrowing region may be formed in the front cavity 1002. The airflow narrowing region is a position at which a cross section of the cavity becomes smaller in a sound propagation direction.

[0051] The speaker 1000 can be used in an electronic device, and the electronic device may form a channel for the speaker 1000 to emit a sound. In this case, the diaphragm 1001 of the speaker 1000 can communicate with the channel of the electronic device, and the channel of the electronic device is equivalent to the front cavity 1002 of the speaker 1000. A structure of the electronic device is generally complex, and an airflow narrowing region is likely to be formed in the channel. In other words, the airflow narrowing region is formed in the front cavity 1002.

[0052] In a process in which the diaphragm 1001 of the speaker 1000 vibrates to emit a sound, the diaphragm 1001, like a piston, quickly pushes air to radiate outward. When an air flow passes the airflow narrowing region of the front cavity 1002 of the speaker 1000, a flow speed increases and an eddy is generated. As a result, noise is generated in the sound emitted by the speaker 1000, affecting sound quality. In a conventional technology, noise generation is generally reduced by increasing a sound outlet area or a cavity volume of the front cavity 1002.

[0053] Refer to FIG. 2 and FIG. 3. FIG. 2 is a diagram of a structure of an electronic device 100 according to an embodiment of this application. FIG. 3 is an exploded view of the electronic device 100 shown in FIG. 2.

[0054] In embodiments of this application, the electronic device 100 may be a device having an audio play function, such as a mobile phone, a tablet computer, a multimedia player, a headset, a stereo, a notebook computer, a vehicle-mounted device, a foldable terminal device, a television, or a wearable device. The wearable device may be a smart band, a smartwatch, a smart head-mounted display, smart glasses, or the like. In the embodiment shown in FIG. 1, an example in which the electronic device 100 is a mobile phone is used for description. Certainly, an electronic device 100 of another type may also use a similar structure. Details are not described again below.

[0055] For ease of description, a width direction of the electronic device 100 is defined as an X direction, a length direction is defined as a Y direction, and a thickness direction is defined as a Z direction.

[0056] In some embodiments, the electronic device 100 may include a middle frame 10, a speaker module 20, a cover 30, and a display 40. The cover 30, the speaker module 20, the middle frame 10, and the display 40 may be sequentially stacked. The middle frame 10 and the cover 30 may form a housing apparatus of the electronic device 100.

[0057] For example, the middle frame 10 may be approximately of a rectangular structure, and a shape of the middle frame 10 may be approximately the same as a shape of the electronic device 100. The middle frame 10 may be used as a main structural component of the electronic device 100, to support and mount components of the electronic device 100. A plurality of grooves or cavities may be formed on the middle frame 10, for mounting of components of the electronic device 100.

[0058] The middle frame 10 may be formed by splicing or assembling a plurality of components. A complex structure of the middle frame 10 helps simplify formation of the middle frame 10.

[0059] A main material of the middle frame 10 may be a metal material, for example, aluminum alloy, magnesium alloy, stainless steel, or titanium alloy. The middle frame 10 may also include a plastic insert or the like. This is not strictly limited in this example. In some other examples, the main material of the middle frame 10 may be plastic.

[0060] For example, the display 40 may be fastened to a side of the middle frame 10. For example, the display 40 may be fastened to the middle frame 10 through bonding, clamping, or the like.

[0061] The display 40 may be electrically connected to the middle frame 10, to implement grounding of the display 40, so as to protect the display 40.

[0062] The display 40 may be an organic light-emitting diode (organic light-emitting diode, OLED) display 40, an active-matrix organic light-emitting diode (active-matrix organic light-emitting diode, AMOLED) display 40, a mini light-emitting diode (mini organic light-emitting diode) display 40, a micro light-emitting diode (micro organic light-emitting diode) display 40, a micro organic light-emitting diode (micro organic light-emitting diode) display 40, a quantum dot light-emitting diode (quantum dot light-emitting diode, QLED) display 40, a liquid crystal display (liquid crystal display, LCD) 40, or the like.

[0063] The display 40 may be a flat display. An area of the display 40 may occupy most of an area of the middle frame 10, to achieve better display effect. In some other embodiments, the display 40 may be a curved display, a foldable display, or a flexible display, and may be specifically disposed according to a requirement of the electronic device 100. This is not strictly limited in embodiments.

[0064] For example, the speaker module 20 may be located inside the electronic device 100.

[0065] The speaker module 20 may be located at the top of the electronic device 100. The speaker module 20 may be mounted on the middle frame 10 in a fixed manner. The electronic device 100 may include a sound outlet channel 1, the sound outlet channel 1 communicates with an external environment through a sound outlet opening 11, and the speaker module 20 propagates a sound to the external environment through the sound outlet channel 1. The sound outlet opening 11 may be located at an end portion of the top of the electronic device 100, to facilitate providing of the sound outlet opening 11. As shown in FIG. 1, an arrow shows an approximate propagation direction of a sound, that is, an approximate flow direction of air. Airflow is limited by a shape of the sound outlet channel 1. When the sound outlet channel 1 is bent, a movement path of air in the sound outlet channel 1 is also bent.

[0066] The speaker module 20 may include a diaphragm 201. The speaker module 20 can be powered on, and drive the diaphragm 201 to emit a sound. When the speaker module 20 is supplied with alternating currents with different characteristics (such as frequencies and voltages), the diaphragm 201 can emit a sound at a corresponding frequency and corresponding loudness, to emit a required sound. For example, the diaphragm 201 may be exposed relative to the speaker module 20, to facilitate sound emission of the speaker module 20. It may be understood that, the diaphragm 201 may communicate with the sound outlet channel 1, so that the diaphragm 201 can vibrate air in the sound outlet channel 1 to emit a sound.

[0067] For example, the cover 30 may be fastened to a side that is of the middle frame 10 and that faces away from the display 40. For example, the cover 30 may be fastened to the middle frame 10 through bonding, clamping, or the like.

[0068] The middle frame 10 may be provided with a mounting groove (not shown in the figure), the cover 30 may be mounted in the mounting groove, and the cover 30 closes the side that is of the middle frame 10 and that is connected to the cover 30, to protect a component between the cover 30 and the middle frame 10. The cover 30 may be connected to the middle frame 10 in a sealed manner, to prevent impurities such as water and dust outside the electronic device 100 from entering the electronic device 100, so as to achieve waterproof and dustproof for the electronic device 100.

[0069] A shape of the cover 30 may be approximately rectangular, and an area of the cover 30 may be approximately the same as the area of the middle frame 10.

[0070] A material of the cover 30 may be glass, ceramic, metal, or the like. This is not strictly limited in embodiments.

[0071] In some embodiments, the electronic device 100 may further include a front-facing camera 50, and the front-facing camera 50 is located inside the electronic device 100.

[0072] The front-facing camera 50 may be located in the middle of the top of the electronic device 100, and the front-facing camera 50 may be mounted on the middle frame 10.

[0073] The front-facing camera 50 may include a light inlet sheet 501, and the light inlet sheet 501 is configured to receive light for imaging. A light transmission hole 401 may be provided at the top of the display 40, and the light transmission hole 401 may be provided corresponding to the light inlet sheet 501 of the front-facing camera 50, so that external light passes through the light transmission hole 401 and enters the front-facing camera 50 through the light inlet sheet 501.

[0074] It may be understood that, there may be one or more front-facing cameras 50. For example, there may be two or three front-facing cameras 50. In this case, there may be two or three light transmission holes 401 correspondingly.

[0075] It may be understood that, the electronic device 100 may further include a rear-facing camera, and the rear-facing camera may be located inside the electronic device 100. A structure of the rear-facing camera is not strictly limited in embodiments.

[0076] In some embodiments, the electronic device 100 may further include a speaker 60 located at the bottom of the electronic device. A sound outlet hole may be provided in the bottom of the electronic device 100, the sound outlet hole may be located on a side of the bottom of the electronic device 100, and the speaker 60 emits a sound through the sound outlet hole. The speaker module 20 at the top and the speaker 60 at the bottom may simultaneously emit a sound, and in this case, a stereo may be formed. Certainly, the speaker module 20 at the top and the speaker 60 at the bottom may alternatively separately emit a sound, to meet different use scenarios.

[0077] In some embodiments, the electronic device 100 may further include a circuit board assembly (not shown in the figure). The circuit board assembly may be located between the cover 30 and the middle frame 10, and the cover 30, the circuit board assembly, and the middle frame 10 may be sequentially stacked. The circuit board assembly may be communicatively connected to the display 40, the speaker module 20, the front-facing camera 50, and the like, so that the circuit board assembly controls the display 40, the speaker module 20, the front-facing camera 50. A structure of the circuit board assembly is not strictly limited in embodiments.

[0078] In some embodiments, the electronic device 100 may further include a plurality of modules (not shown in the figure), and the plurality of modules may be accommodated in the middle frame 10. The plurality of modules of the electronic device 100 may include but are not limited to a battery, an earpiece module, a microphone module, a sensor module, and the like. A quantity, types, positions, and the like of modules of the electronic device 100 are not specifically limited in embodiments of this application.

[0079] Refer to FIG. 3 to FIG. 5. FIG. 4 is a diagram of a partial structure of the middle frame 10 shown in FIG. 3. FIG. 5 is a diagram of a partial structure of the middle frame 10 shown in FIG. 3 from another viewpoint. The viewpoint in FIG. 5 is a flipped viewpoint of the viewpoint in FIG. 4.

[0080] In some embodiments, the middle frame 10 may include a side frame 101 and a middle plate 102.

[0081] The middle plate 102 and the side frame 101 may be an integrated mechanical part. In some examples, the middle plate 102 and the side frame 101 may be integrally formed, but this is not limited thereto. For example, the middle plate 102 and the side frame 101 may include a detachable member, and the detachable member may form a part of the middle plate 102 or the side frame 101 in an assembly manner.

[0082] The side frame 101 may be disposed around the middle plate 102, and the side frame 101 is fastened to the middle plate 102. The side frame 101 may be approximately of a ring structure, and a charging hole, a card slot hole, and the like may be provided on the side frame 101. The side frame 101 may be made of a metal material, and the side frame 101 may form a radiation structure for a plurality of antennas of the electronic device 100. The middle plate 102 may be approximately of a plate structure, and both sides of the middle plate 102 may be used for mounting of components and modules of the electronic device 100. The middle plate 102 may be partially hollow, so that spaces on the two sides of the middle plate 102 communicate with each other. When a module needs to cross the middle plate 102, the module may cross through a hollow region. This reduces a thickness of the electronic device 100, and facilitates a thin design of the electronic device 100.

[0083] In some embodiments, the middle frame 10 may be provided with a first mounting groove 103 and a second mounting groove 104.

[0084] The first mounting groove 103 and the second mounting groove 104 may be located on two sides of the middle frame 10 that face away from each other. The first mounting groove 103 is located on a side that is of the middle frame 10 and that faces away from the cover 30, and the second mounting groove 104 is located on a side that is of the middle frame 10 and that faces the cover 30.

[0085] The first mounting groove 103 may be used for mounting of the display 40, the first mounting groove 103 has a large space, and the first mounting groove 103 may be formed on the side frame 101.

[0086] The second mounting groove 104 may be used for mounting of the speaker module 20, the second mounting groove 104 occupies a small space, and the second mounting groove 104 may be formed on the middle plate 102. For example, the middle plate 102 includes a plurality of protruding portions 1041 that protrude. There may be a plurality of protruding portions 1041. The plurality of protruding portions 1041 enclose a groove space, to form the second mounting groove 104. The speaker module 20 may be placed in the second mounting groove 104, and a main structure of the speaker module 20 may be fastened to the plurality of protruding portions 1041, to fasten the speaker module 20 to the middle frame 10. In some other embodiments, the second mounting groove 104 may be enclosed by a continuous baffle structure.

[0087] In some embodiments, the middle frame 10 may be provided with a sound outlet groove 105. The sound outlet groove 105 may be provided on a side that is of the middle frame 10 and that faces away from the second mounting groove 104, and the sound outlet groove 105 may be located at the top of the middle frame 10 and extend to the side frame 101. A part of region of the sound outlet groove 105 may be concave relative to a plate surface of the middle plate 102. In a direction perpendicular to the plate surface of the middle plate 102 (namely, the Z direction), a part of region of the sound outlet groove 105 may overlap a part of region of the second mounting groove 104.

[0088] For example, the sound outlet groove 105 may include a first side wall 1051, a second side wall 1052, and a third side wall 1053, the second side wall 1052 is disposed opposite to the first side wall 1051, and the third side wall 1053 is connected between the first side wall 1051 and the second side wall 1052.

[0089] In some embodiments, the middle frame 10 may be provided with a communication hole 106. The communication hole 106 may be provided on the middle plate 102, and the communication hole 106 connects the spaces on the two sides of the middle plate 102.

[0090] The communication hole 106 may connect the second mounting groove 104 to the sound outlet groove 105. In this case, the second mounting groove 104 and the sound outlet groove 105 may form a connected space.

[0091] In some embodiments, the middle frame 10 may be further provided with a third mounting groove 107. The third mounting groove 107 may be located on the side that is of the middle frame 10 and that faces the cover 30. In other words, the third mounting groove 107 and the second mounting groove 104 are located on the same side of the middle frame 10. The third mounting groove 107 may be located at the top of the middle frame 10, and is located at a middle position of the middle frame 10 in the X direction.

[0092] The third mounting groove 107 may be approximately of a rectangular structure, and the third mounting groove 107 may be formed on the middle plate 102. In the Z direction, the third mounting groove 107 and the sound outlet groove 105 may overlap. For example, on a side that is of the middle plate 102 and on which the second mounting groove 104 is provided, the third mounting groove 107 may be formed by the middle plate 102 by curving inward. In this case, on the other side of the middle plate 102, a bottom wall of the third mounting groove 107 may protrude relative to the plate surface of the middle plate 102. In addition, the sound outlet groove 105 surrounds the third mounting groove 107, and a side wall of the third mounting groove 107 also serves to form the sound outlet groove 105.

[0093] The bottom wall of the third mounting groove 107 may be provided with a mounting hole 1071. The mounting hole 1071 may run through the middle plate 102, and connect the spaces on the two sides of the middle plate 102. The mounting hole 1071 may be a circular hole.

[0094] In addition, on the side that is of the middle frame 10 and on which the sound outlet groove 105 is provided, a periphery of the mounting hole 1071 may form a part of region of an avoidance region 108. In other words, the electronic device 100 includes the avoidance region 108. The avoidance region 108 and the communication hole 106 may be arranged in the X direction. The avoidance region 108 may be approximately a circular region, the avoidance region 108 may be disposed concentrically with the mounting hole 1071, and an area of the avoidance region 108 is greater than or equal to an area of the mounting hole 1071. It may be understood that, a region of the avoidance region 108 may include a region of the mounting hole 1071. It may be understood that, the communication hole 106 and the avoidance region 108 may be staggered in the Y direction.

[0095] The third mounting groove 107 may be used for mounting of the front-facing camera 50. In this case, most of a structure of the front-facing camera 50 may be mounted in a groove position of the third mounting groove 107, and the mounting hole 1071 may be used for mounting of a partial structure at the light inlet sheet 501 of the front-facing camera 50, so that light can be emitted into the light inlet sheet 501 of the front-facing camera 50. The avoidance region 108 may be configured to accommodate a part of the structure of the front-facing camera 50, and the avoidance region 108 may be further configured to accommodate a fastener or a sealing element that fastens the front-facing camera 50.

[0096] In some embodiments, the middle frame 10 may further include a flow-guiding portion 109. In other words, the electronic device 100 includes the flow-guiding portion 109. The flow-guiding portion 109 is located on the side that is of the middle frame 10 and on which the sound outlet groove 105 is provided, and the flow-guiding portion 109 may be located in the sound outlet groove 105.

[0097] For example, the flow-guiding portion 109 may be located between the communication hole 106 and the avoidance region 108. The flow-guiding portion 109 may be attached to the avoidance region 108. In other words, the flow-guiding portion 109 is attached to the avoidance region 108, and there is no gap between the flow-guiding portion 109 and the avoidance region 108.

[0098] The flow-guiding portion 109 may be a boss structure, a surface that is of the flow-guiding portion 109 and that faces the communication hole 106 is a flow-guiding surface 1091, and the flow-guiding surface 1091 may be a curved surface. For example, the flow-guiding surface 1091 may be an arc surface.

[0099] For example, the flow-guiding portion 109 may be approximately of a triangular pillar structure, and the flow-guiding portion 109 may be formed by a partial structure of the middle plate 102. In this case, the flow-guiding portion 109 and the middle frame 10 are an integrally formed mechanical part. This facilitates formation of the flow-guiding portion 109 during manufacturing of the middle frame 10, to improve connection reliability of the flow-guiding portion 109 and simplify assembly of the electronic device 100.

[0100] In some other examples, the flow-guiding portion 109 may alternatively be a ribbed plate structure or a stiffener structure that includes a flow-guiding surface 1091. This is not strictly limited in embodiments.

[0101] In some embodiments, the electronic device 100 may further include a flow-leading portion 1010. The flow-leading portion 1010 may be formed on the middle frame 10.

[0102] For example, the flow-leading portion 1010 may be a boss structure. In this case, the flow-guiding portion 109 protrudes from a boss surface of the flow-leading portion 1010. The surface that is of the flow-guiding portion 109 and that faces the communication hole is close to the avoidance region 108 relative to a surface that is of the flow-leading portion 1010 and that faces the communication hole 106. The surface that is of the flow-leading portion 1010 and that faces the communication hole 106 is a flow-leading surface 1011. In other words, the flow-guiding surface 1091 is retracted toward the avoidance region 108 relative to the flow-leading surface 1011. In some other examples, the electronic device 100 may not include the flow-leading portion 1010.

[0103] In some other embodiments, there may be a gap between the flow-guiding portion 109 and the avoidance region 108.

[0104] Refer to FIG. 4 to FIG. 6. FIG. 6 is a sectional view of a partial structure along A-A in FIG. 2.

[0105] In some embodiments, the display 40 may be mounted in the first mounting groove 103, and the sound outlet channel 1 is formed between the display 40 and the middle frame 10. The speaker module 20 may be mounted in the second mounting groove 104, and a sound inlet channel 2 may be formed between the speaker module 20 and the middle frame 10. The sound inlet channel 2 and the sound outlet channel 1 may communicate with each other through the communication hole 106, to form a complete cavity space. In this case, both the sound inlet channel 2 and the sound outlet channel 1 are equivalent to a front cavity of the speaker module 20, so that the front cavity of the speaker module 20 has a large volume, to mitigate impact on sound quality of the electronic device 100.

[0106] For example, the speaker module 20 may include a diaphragm 201, a basin frame 202, a voice coil (not shown in the figure), and a magnetic circuit assembly (not shown in the figure). The diaphragm 201 and the magnetic circuit assembly may be fastened to the basin frame 202. The diaphragm 201 and the magnetic circuit assembly are disposed opposite to each other. The magnetic circuit assembly may have a magnetic gap. An end of the voice coil is fastened to the diaphragm 201, and another end is located in the magnetic gap of the magnetic circuit assembly. When the voice coil is energized, the voice coil and the magnetic circuit assembly generate interaction force, and the voice coil is driven. Because the voice coil is fastened to the diaphragm 201, the voice coil drives the diaphragm 201 to vibrate, so as to emit a sound.

[0107] The basin frame 202 may be fastened to the protruding portion 1041, to fasten the speaker module 20 to the second mounting groove 104. In addition, the basin frame 202 may abut against a bottom wall of the second mounting groove 104.

[0108] The diaphragm 201 may be disposed toward the middle plate 102, and the sound inlet channel 2 is formed between the diaphragm 201 and a wall surface of the second mounting groove 104. For example, the diaphragm 201 may be disposed toward the communication hole 106. In other words, the diaphragm 201 faces the side that faces away from the cover 30. A vibration direction of the diaphragm 201 may be parallel to the Z direction, to facilitate mounting of the speaker module 20. In this case, because the diaphragm 201 faces the communication hole 106, a spacing between the diaphragm 201 and the communication hole 106 is small, a path is straight, and a sound emitted by the diaphragm 201 is easily propagated to the communication hole 106 and then enters the sound outlet channel 1. This has little impact on sound quality of the sound emitted by the diaphragm 201, and helps improve sound quality of the electronic device 100.

[0109] It may be understood that, structures that are of the speaker module 20 and the first mounting groove 103 and that form the sound inlet channel 2 may be connected in a sealed manner, so that the sound inlet channel 2 forms a relatively closed cavity, and the sound enters the sound outlet channel 1 through the communication hole 106, to avoid sound leakage and avoid impact on sound quality.

[0110] For example, a partial structure of the display 40 is disposed opposite to the sound outlet groove 105, and is spaced from the sound outlet groove 105. The partial structure of the display 40 disposed opposite to the sound outlet groove 105 may form the sound outlet channel 1 with the sound outlet groove 105. In addition, another partial structure of the display 40 may be in contact with the middle frame 10, and is fastened to the middle frame 10, so that the display 40 is fastened to the first mounting groove 103 of the middle frame 10. For example, an adhesive may be dispensed or applied to a side that is of the display 40 and that faces the middle frame 10, to fasten the display 40 to the middle frame 10.

[0111] Because the sound outlet groove 105 is provided around the avoidance region 108, the sound outlet channel 1 is provided around the avoidance region 108. In this case, the sound outlet channel 1 has a large area in a plane formed in the X direction and the Y direction, which is equivalent to that the speaker module 20 has a front cavity with a large area. This can reduce a flow speed of air flowing in the front cavity, and helps reduce noise of the electronic device 100 when the speaker module 20 emits a sound.

[0112] It may be understood that, because another component and another module need to be mounted on the middle frame 10, the sound outlet channel 1 is limited by a structure of the electronic device 100, and it is usually difficult to increase a volume of the sound outlet channel 1. In this example, a space around the avoidance region 108 is used to form the sound outlet channel 1 for sound emission, so that the volume of the sound outlet channel 1 is increased, thereby helping improve sound quality of the electronic device 100.

[0113] For example, the sound outlet channel 1 may include a first wall surface 12 and a second wall surface 13. The second wall surface 13 is disposed opposite to the first wall surface 12.

[0114] For example, the first wall surface 12, the flow-guiding portion 109, and the second wall surface 13 may be arranged in a first direction, and the first direction may be parallel to the length direction (namely, the Y direction) of the electronic device 100. In this case, the sound outlet opening 11 may be provided on the first wall surface 12, and the sound outlet opening 11 is at least partially located on the first wall surface 12. The communication hole 106 may be located at an end portion of the second wall surface 13. In some examples, the communication hole 106 and the avoidance region 108 may be arranged in a second direction, and the communication hole 106 and the avoidance region 108 may be staggered in the first direction. This is not strictly limited in the examples. The second direction is parallel to the width direction (namely, the X direction) of the electronic device 100.

[0115] The sound outlet opening 11 may be formed by a gap between an edge of the middle frame 10 and an edge of the display 40. In this case, the sound outlet opening 11 is simple to form, and has little impact on structures of the display 40 and the middle frame 10. This helps simplify a manufacturing process and improve structure strength of the electronic device 100. In some other embodiments, the sound outlet opening 11 may be formed by digging a hole on the side frame 101 of the middle frame 10, or the sound outlet opening 11 may be formed by digging a hole at the top of a screen.

[0116] A length-width ratio of the sound outlet opening 11 may be greater than or equal to 10. In this case, the sound outlet opening 11 has a large length-width ratio. This helps increase a sound outlet area of the sound outlet opening 11, to reduce noise.

[0117] The flow-guiding portion 109 is configured to guide a flow, that is, guide air in the sound outlet channel 1, to avoid generating an eddy and the like.

[0118] Because the flow-guiding portion 109 is attached to the avoidance region 108, and there is no gap between the flow-guiding portion 109 and the avoidance region 108, in the sound outlet channel 1, no gas flow channel is formed between the flow-guiding portion 109 and the avoidance region 108. In this case, a structure of the sound outlet channel 1 is simple, which facilitates airflow in the sound outlet channel 1.

[0119] It may be understood that, structures that are of the display 40 and the middle frame 10 and that form the sound outlet channel 1 may be connected in a sealed manner, so that the sound outlet channel 1 forms a relatively closed cavity, and the sound that enters the sound outlet channel 1 through the communication hole 106 is emitted from the sound outlet opening 11, to avoid sound leakage and avoid impact on sound quality.

[0120] It may be understood that, the light transmission hole 401 (as shown in FIG. 6) of the display 40 may be provided corresponding to the mounting hole 1071 (as shown in FIG. 4) of the middle frame 10. For example, the two holes may be provided concentrically with each other, to facilitate entry of light into the front-facing camera 50 (as shown in FIG. 3). In addition, the sound outlet channel 1 does not communicate with the light transmission hole 401, and the sound outlet channel 1 does not communicate with the mounting hole 1071, so that the sound outlet channel 1 forms a relatively closed cavity, to avoid sound leakage.

[0121] Because the sound outlet groove 105 is provided around the avoidance region 108, an airflow narrowing region is likely to occur around the avoidance region 108. When air flows in the airflow narrowing region, a flow speed is likely to be excessively high or an eddy is likely to be generated, which generates noise.

[0122] When the diaphragm 201 vibrates, air in the sound inlet channel 2 and the sound outlet channel 1 is driven by the diaphragm 201 to vibrate. As shown in FIG. 4 and FIG. 6, an example in which the diaphragm 201 pushes air is used. Air moves from the diaphragm 201 toward the communication hole 106, and diffuses from the communication hole 106 to the sound outlet channel 1. In the sound outlet channel 1, because the flow-guiding portion 109 is located between the avoidance region 108 and the communication hole 106, a part of air directly flows out of the sound outlet opening 11, and a part of air first comes into contact with the flow-guiding portion 109, slightly changes a movement direction, and then flows out of the sound outlet opening 11 after passing through the avoidance region 108. It may be understood that, the flow-guiding portion 109 can guide air toward a region with low air density to reduce air density in the airflow narrowing region, to reduce a flow speed of air in the airflow narrowing region, so as to reduce noise. In addition, the flow-guiding portion 109 can make a flow path of air in the sound outlet channel 1 more smooth, which helps reduce eddy generation, to reduce noise.

[0123] In the embodiments, the flow-guiding portion 109 is disposed, so that the flow-guiding portion 109 guides air in the sound outlet channel 1, to reduce a maximum flow speed of air in the sound outlet channel 1, so as to reduce noise generation. This helps improve sound quality of the electronic device 100 during sound emission, to improve sound quality of the electronic device 100, without affecting another structure of the electronic device 100. In other words, this facilitates a miniaturization design of the electronic device 100, and enhances user experience.

[0124] In some embodiments, the flow-guiding portion 109 may be a boss structure, and the surface that is of the flow-guiding portion 109 and that faces the communication hole 106 is a curved surface. Such a structure of the flow-guiding portion 109 helps the flow-guiding portion 109 directly guide air movement, and the flow-guiding surface 1091 being a curved surface can also reduce an eddy during airflow, to reduce noise generation.

[0125] In some embodiments, when the electronic device 100 includes the flow-leading portion 1010 (as shown in FIG. 4), the flow-leading portion 1010 may be configured to assist in flow guiding, to reduce the maximum flow speed of air in the sound outlet channel 1, so as to reduce noise generation.

[0126] In some embodiments, an area of the communication hole 106 may be greater than or equal to one-eighth of an area of the diaphragm 201. The area of the communication hole 106 cannot be excessively small, to prevent a flow speed from being excessively high when air passes through the communication hole 106, so as to avoid generating noise. For example, the area of the communication hole 106 may be a quarter of the area of the diaphragm 201 of the speaker module 20. In this case, the communication hole 106 has a large area, and has little impact on sound quality of the speaker module 20. In addition, providing the communication hole 106 has little damage to a structure of the bottom wall of the second mounting groove 104, and the bottom wall of the second mounting groove 104 is reliable in fastening of the speaker module 20.

[0127] FIG. 7 is a simplified diagram of airflow in the sound inlet channel 2 and the sound outlet channel 1 of the electronic device 100 shown in FIG. 2. FIG. 7 shows an example in which air flows out of the sound outlet opening 11.

[0128] In some embodiments, in the sound inlet channel 2 and the sound outlet channel 1, an overall flow direction of air is a direction from the speaker to the sound outlet opening 11. Air is pushed by the speaker, and air in the sound inlet channel 2 flows from the communication hole 106 toward each part of the sound outlet channel 1. In the sound outlet channel 1, due to a position relationship between the communication hole 106 and the sound outlet channel 1, a flow direction of a part of air is a direction from the communication hole 106 to a left region of the sound outlet opening 11. Due to disposition of the flow-guiding portion 109 and the avoidance region 108, a flow direction of a part of air is a direction from the communication hole 106 to a middle region of the sound outlet opening 11 through an upper side of the flow-guiding portion 109 and an upper side of the avoidance region 108, and a flow direction of another part of air is a direction from the communication hole 106 to a right region of the sound outlet opening 11 through a lower side of the flow-guiding portion 109, a lower side of the avoidance region 108, and a right side of the avoidance region 108.

[0129] Refer to FIG. 8 and FIG. 9. FIG. 8 is a diagram of structures of the sound inlet channel 2 and the sound outlet channel 1 shown in FIG. 7. FIG. 9 is a diagram of structures of the sound inlet channel 2 and the sound outlet channel 1 shown in FIG. 8 from another viewpoint. To clearly show the structures of the sound outlet channel 1 and the sound inlet channel 2, FIG. 8 and FIG. 9 are diagrams of materialized structures, which are actually cavities in the electronic device 100. The viewpoint in FIG. 9 is a viewpoint obtained after the structures shown in FIG. 8 are flipped.

[0130] In some embodiments, the sound outlet channel 1 may further include a third wall surface 14 and a fourth wall surface 15. The third wall surface 14 and the fourth wall surface 15 are disposed opposite to each other and arranged in the X direction. The third wall surface 14, the second wall surface 13, and the fourth wall surface 15 are sequentially connected, and both the third wall surface 14 and the third wall surface 14 are located between the sound outlet opening 11 and the second wall surface 13. In the X direction, a length of the sound outlet opening 11 may be greater than a length of the second wall surface 13, to facilitate sound emission from the sound outlet opening 11.

[0131] For example, the second wall surface 13 is disposed opposite to the first wall surface 12, the third wall surface 14 is connected between the first wall surface 12 and the second wall surface 13, the communication hole 106 is provided corresponding to a connection between the second wall surface 13 and the third wall surface 14, and the avoidance region 108 is located between the first wall surface 12 and the second wall surface 13. In this example, the structure of the sound outlet channel 1 is disposed, which facilitates use of the space around the avoidance region 108, and helps increase a volume of the sound outlet channel 1. In addition, the speaker module 20 is arranged in a plane formed in the length direction and the width direction of the electronic device 100 (as shown in FIG. 4) relative to the avoidance region 108. This helps reduce a thickness space of the electronic device 100, and therefore facilitates thinning of the electronic device 100.

[0132] It may be understood that, the first wall surface 12 may be partially formed by the first side wall 1051 (as shown in FIG. 4), the second wall surface 13 may be partially formed by the second side wall 1052 (as shown in FIG. 4), and the third wall surface 14 may be partially formed by the third side wall 1053 (as shown in FIG. 4).

[0133] The sound inlet channel 2 may be approximately of a rectangular pillar structure, and the sound outlet channel 1 may be approximately of a thin plate structure. The sound inlet channel 2 and the sound outlet channel 1 communicate with each other at the communication hole 106, and the communication hole 106 may be located at a connection between the second wall surface 13 and the third wall surface 14.

[0134] The avoidance region 108 and the flow-guiding portion 109 are disposed in the middle of the sound outlet channel 1. The sound outlet channel 1 surrounds the avoidance region 108. The flow-guiding portion 109 is located between the communication hole 106 and the avoidance region 108. The flow-guiding portion 109 is configured to guide a flow. The flow-guiding portion 109 and the avoidance region 108 do not form a cavity. In other words, the flow-guiding portion 109 and the avoidance region 108 are not used for air to flow. It may be understood that, in a direction perpendicular to the thickness direction (the Z direction) of the electronic device 100, an area of the flow-guiding portion 109 is less than an area of the avoidance region 108. The area of the flow-guiding portion 109 cannot be excessively large, to prevent an area of the sound outlet channel 1 from being excessively small, so as to avoid affecting sound quality.

[0135] The flow-guiding portion 109 may smoothly transition to the avoidance region 108. For example, the flow-guiding portion 109 may further include a first surface 1092 and a second surface 1093, the first surface 1092 and the second surface 1093 are disposed at an included angle, and the first surface 1092 and the second surface 1093 are separately smoothly connected to the avoidance region 108. The first surface 1092, the flow-guiding surface 1091, and the second surface 1093 may be sequentially connected and smoothly transition, to help the flow-guiding portion 109 guide air.

[0136] An airflow narrowing region 16 may be formed around the avoidance region 108. For example, the airflow narrowing region 16 may be formed between the avoidance region 108 and the sound outlet opening 11. Because the flow-guiding portion 109 is located between the communication hole 106 and the avoidance region 108, the flow-guiding portion 109 may guide an air flow. Before air flows through the airflow narrowing region 16, the flow-guiding portion 109 may slightly change a flow direction of air to reduce air flowing to the airflow narrowing region 16, to reduce a flow speed of air in the airflow narrowing region 16, so as to reduce noise.

[0137] In some other embodiments, the second wall surface 13 and the fourth wall surface 15 of the sound outlet channel 1 may form an arc surface. For example, the arc surface may correspond to a shape of a periphery of the avoidance region 108, and may be specifically disposed according to a requirement. This is not strictly limited in embodiments.

[0138] FIG. 10 is a diagram of the sound inlet channel 2 and the sound outlet channel 1 of the electronic device 100 that are shown in FIG. 7 in some other embodiments. The sound inlet channel 2 and the sound outlet channel 1 shown in the embodiment in FIG. 10 may include most technical features of the sound inlet channel 2 and the sound outlet channel 1 shown in the embodiment in FIG. 8. The following mainly describes a difference between the two, and most technical content that is the same between the two is not described again.

[0139] A main difference between the sound inlet channel 2 and the sound outlet channel 1 in the embodiment in FIG. 10 and the sound inlet channel 2 and the sound outlet channel 1 in the embodiment in FIG. 8 lies in a shape of the flow-guiding portion 109.

[0140] In some embodiments, the flow-guiding surface 1091 of the flow-guiding portion 109 may be approximately a flat surface.

[0141] For example, the first surface 1092, the flow-guiding surface 1091, and the second surface 1093 of the flow-guiding portion 109 are sequentially connected, and the first surface 1092 and the second surface 1093 may be disposed opposite to each other and arranged in the Y direction. The flow-guiding surface 1091 may be disposed in parallel to the second wall surface 13, and the first surface 1092 may be disposed in parallel to the second surface. The flow-guiding surface 1091 and the first surface 1092 may be connected by using an arc surface, to help the flow-guiding surface 1091 guide a flow.

[0142] For a position of the flow-guiding portion 109 and connection between the flow-guiding portion 109 and another component, refer to related descriptions in the embodiment in FIG. 8. Details are not described in this embodiment again.

[0143] Refer to FIG. 10 to FIG. 12. FIG. 11 is a simulation diagram of flow speeds of air in the sound inlet channel 2 and the sound outlet channel 1 of the electronic device 100 that are shown in FIG. 10. FIG. 12 is a comparison diagram of the simulation diagram of FIG. 11. The simulation diagram of FIG. 12 is obtained by simulating a structure obtained after the flow-guiding portion 109 is removed in the embodiment in FIG. 10, and other simulation conditions of FIG. 12 are the same as simulation conditions of FIG. 11.

[0144] In FIG. 11 and FIG. 12, a red region is a region with a higher flow speed, and a blue region is a region with a lower flow speed.

[0145] It can be learned that, in FIG. 12, a position with a highest flow speed corresponds to the periphery of the avoidance region 108 and is close to the sound outlet opening 11, and the highest flow speed is 58.2 m / s. In FIG. 11, a position with a highest flow speed corresponds to a position between the flow-guiding portion 109 and the sound outlet opening 11 in FIG. 10, and the highest flow speed is 48.1 m / s. The flow-guiding portion 109 is disposed, so that air can be guided when air vibrates, to reduce the maximum flow speed in the sound outlet channel 1, so as to reduce noise generation, thereby improving sound quality of the electronic device 100 (as shown in FIG. 7). It may be understood that, disposing the flow-guiding portion 109 may slightly increase flow speeds in some regions in the sound outlet channel 1, but no noise is generated when the flow speeds in the regions are increased. The regions with the slightly increased flow speeds have little impact on sound quality, and the maximum flow speed in the entire sound outlet channel 1 is reduced to a large extent, thereby achieving good overall noise reduction effect.

[0146] FIG. 13 is a diagram of a structure of the middle frame 10 of the electronic device 100 shown in FIG. 3 in some other embodiments. The middle frame 10 shown in the embodiment in FIG. 13 may include most technical features of the middle frame 10 shown in the embodiment in FIG. 4. The following mainly describes a difference between the two, and most technical content that is the same between the two is not described again.

[0147] A main difference between the middle frame 10 shown in the embodiment in FIG. 13 and the middle frame 10 shown in the embodiment in FIG. 4 lies in disposition of the flow-guiding portion 109.

[0148] In some embodiments, the flow-guiding portion 109 may be located at an edge of the communication hole 106. For example, the flow-guiding portion 109 is flush with a side wall of the communication hole 106; or there is a spacing between the flow-guiding portion 109 and the communication hole 106, and the spacing between the flow-guiding portion 109 and the communication hole 106 is less than a spacing between the flow-guiding portion 109 and the avoidance region 108. In this case, the flow-guiding portion 109 may guide air at the communication hole 106, so that air can be guided at a start position of the sound outlet channel 1, making it easier to change a flow direction of air.

[0149] For example, the flow-guiding portion 109 may include a plurality of flow-guiding pillars 1094, the plurality of flow-guiding pillars 1094 are spaced from each other, a spacing between at least two adjacent flow-guiding pillars 1094 is less than a spacing between other adjacent flow-guiding pillars 1094, and a spacing between at least a part of flow-guiding pillars 1094 on a side close to the avoidance region 108 is less than a spacing between at least a part of flow-guiding pillars 1094 on a side away from the avoidance region 108.

[0150] For example, the plurality of flow-guiding pillars 1094 may be sequentially arranged along the edge of the communication hole 106. Some flow-guiding pillars 1094 are located between the communication hole 106 and the sound outlet opening 11, and a spacing between the some flow-guiding pillars 1094 may be set to be large, to reduce airflow resistance. Other flow-guiding pillars 1094 are located between the communication hole 106 and the avoidance region 108, and a spacing between the other flow-guiding pillars 1094 may be set to be small, to prevent a lot of air from flowing toward the avoidance region 108, so as to avoid generating noise. In addition, a spacing between a plurality of flow-guiding pillars 1094 close to the second side wall 1052 and a spacing between a flow-guiding pillar 1094 and the second side wall 1052 may be set to be large, to facilitate airflow in a path between the second side wall 1052 and the avoidance region 108.

[0151] In this example, the plurality of flow-guiding pillars 1094 are disposed, and spacings between flow-guiding pillars 1094 are set, so that a flow direction of air is guided more delicately based on the shape of the sound outlet channel 1, to reduce noise generation.

[0152] For other structures of the middle frame 10, refer to related descriptions in the embodiments in FIG. 4 to FIG. 9. Details are not described in this embodiment again.

[0153] FIG. 14 is a diagram of a structure of the middle frame 10 of the electronic device 100 shown in FIG. 3 in still some other embodiments. The middle frame 10 shown in the embodiment in FIG. 14 may include most technical features of the middle frame 10 shown in the embodiment in FIG. 13. The following mainly describes a difference between the two, and most technical content that is the same between the two is not described again.

[0154] A main difference between the middle frame 10 shown in the embodiment in FIG. 13 and the middle frame 10 shown in the embodiment in FIG. 4 lies in disposition of the flow-guiding portion 109.

[0155] In some embodiments, the flow-guiding portion 109 may be mesh fabric, and the mesh fabric is fastened to the middle frame 10. The mesh fabric has a plurality of mesh holes 1095. Hole sizes of the plurality of mesh holes 1095 of the mesh fabric are uneven. A hole size of at least a part of mesh holes 1095 on a side that is of the mesh fabric and that is close to the avoidance region 108 is less than a hole size of at least a part of mesh holes 1095 on a side that is of the mesh fabric and that is away from the avoidance region 108.

[0156] For example, the middle frame 10 may be provided with a plurality of mounting pillars 1096, the plurality of mounting pillars 1096 are located on a periphery of the communication hole 106, and the mesh fabric, namely, the flow-guiding portion 109, may be bonded to the mounting pillars 1096, to fasten the flow-guiding portion 109.

[0157] For example, a mesh hole 1095 on a part that is of the flow-guiding portion 109 and that faces the sound outlet opening 11 may be provided to be large, to reduce airflow resistance. A gap on a part that is of the flow-guiding portion 109 and that faces the avoidance region 108 may be provided to be small, to prevent a lot of air from flowing toward the avoidance region 108, so as to avoid generating noise. In addition, a mesh hole 1095 on a part that is of the flow-guiding portion 109 and that is close to the second side wall 1052 may be provided to be large, to facilitate airflow in a path between the second side wall 1052 and the avoidance region 108.

[0158] In this example, the flow-guiding portion 109 is disposed as mesh fabric, and the flow-guiding portion 109 is provided with mesh holes 1095 with uneven hole sizes, so that the flow direction of air can be guided more delicately based on the shape of the sound outlet channel 1, to reduce noise generation.

[0159] For other structures of the middle frame 10, refer to related descriptions in the embodiments in FIG. 4 to FIG. 9. Details are not described in this embodiment again.

[0160] An embodiment of this application further provides a middle frame.

[0161] In some embodiments, the middle frame is provided with a first mounting groove and a second mounting groove, the first mounting groove and the second mounting groove are located on two sides of the middle frame that face away from each other, the first mounting groove is used for mounting of a display, and the second mounting groove is used for mounting of a speaker module. The middle frame is further provided with a sound outlet groove and a communication hole, the sound outlet groove is configured to form a sound outlet channel with the display, and the communication hole runs through the middle frame and communicates with the sound outlet groove. The middle frame is further provided with a mounting hole and a flow-guiding portion, the mounting hole runs through the middle frame and is surrounded by the sound outlet groove, and the flow-guiding portion protrudes from a bottom wall of the sound outlet groove and is located between the communication hole and the mounting hole.

[0162] In this embodiment, when the middle frame is used in an electronic device, the flow-guiding portion is configured to guide a flow, and the sound outlet groove is configured to form the sound outlet channel with the display. The flow-guiding portion is disposed, so that the flow-guiding portion guides air in the sound outlet channel, to reduce a maximum flow speed of air in the sound outlet channel, so as to reduce noise generation. This helps improve sound quality of the electronic device during sound emission, to improve sound quality of the electronic device, without affecting another structure of the electronic device. In other words, this facilitates a miniaturization design of the electronic device, and enhances user experience.

[0163] In some embodiments, the flow-guiding portion is a boss, and a surface that is of the flow-guiding portion and that faces the communication hole is a curved surface. Such a structure of the flow-guiding portion helps the flow-guiding portion directly guide air movement, and a flow-guiding surface being a curved surface can also reduce an eddy during airflow, to reduce noise generation.

[0164] In some embodiments, the middle frame further includes a flow-leading portion, the flow-leading portion is a boss, the flow-guiding portion protrudes from a boss surface of the flow-leading portion, and the surface that is of the flow-guiding portion and that faces the communication hole is close to the mounting hole relative to a surface that is of the flow-leading portion and that faces the communication hole. The flow-leading portion is disposed, and the flow-leading portion is configured to assist in flow guiding, to reduce the maximum flow speed of air in the sound outlet channel, so as to reduce noise generation.

[0165] In some embodiments, a structure of the middle frame may be similar to the structure of the middle frame in the embodiments in FIG. 1 to FIG. 14. The structure of the middle frame is not described in this embodiment again.

[0166] It should be noted that embodiments of this application and features in embodiments may be combined with each other without a conflict, and any combination of features in different embodiments also falls within the protection scope of this application. In other words, the plurality of embodiments described above may be further combined according to an actual requirement.

[0167] It should be noted that all the foregoing accompanying drawings are example figures of this application, and do not represent actual sizes of products. In addition, a size proportional relationship between components in the accompanying drawings is not intended to limit an actual product in this application.

[0168] The foregoing descriptions are merely some embodiments and implementations of this application, but are not intended to limit the protection scope of this application. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in this application shall fall within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

1. An electronic device, comprising a middle frame, a display, and a speaker module, wherein the display is mounted on a side of the middle frame, a sound outlet channel is formed between the display and the middle frame, the middle frame is provided with a communication hole, the communication hole communicates with the sound outlet channel, the speaker module is mounted on a side that is of the middle frame and that faces away from the display, and a sound emitted by the speaker module enters the sound outlet channel through the communication hole; and the electronic device comprises an avoidance region and a flow-guiding portion, and the flow-guiding portion is located between the communication hole and the avoidance region.

2. The electronic device according to claim 1, wherein the sound outlet channel comprises a first wall surface, a second wall surface, and a third wall surface, the second wall surface is disposed opposite to the first wall surface, and the third wall surface is connected between the first wall surface and the second wall surface; the communication hole is provided corresponding to a connection between the second wall surface and the third wall surface, and the avoidance region is located between the first wall surface and the second wall surface; and the sound outlet channel is further provided with a sound outlet opening, and the sound outlet opening is at least partially located on the first wall surface.

3. The electronic device according to claim 1, wherein the flow-guiding portion is a boss, and a surface that is of the flow-guiding portion and that faces the communication hole is a curved surface.

4. The electronic device according to claim 3, wherein the electronic device further comprises a flow-leading portion, the flow-leading portion is a boss, the flow-guiding portion protrudes from a boss surface of the flow-leading portion, and the surface that is of the flow-guiding portion and that faces the communication hole is close to the avoidance region relative to a surface that is of the flow-leading portion and that faces the communication hole.

5. The electronic device according to any one of claims 1 to 4, wherein the flow-guiding portion is attached to the avoidance region.

6. The electronic device according to any one of claims 1 to 4, wherein the flow-guiding portion is located at an edge of the communication hole.

7. The electronic device according to claim 6, wherein the flow-guiding portion comprises a plurality of flow-guiding pillars, the plurality of flow-guiding pillars are spaced from each other, and a spacing between at least a part of flow-guiding pillars on a side close to the avoidance region is less than a spacing between at least a part of flow-guiding pillars on a side away from the avoidance region.

8. The electronic device according to claim 7, wherein the flow-guiding portion is mesh fabric, the mesh fabric is fastened to the middle frame, hole sizes of a plurality of mesh holes of the mesh fabric are uneven, and a hole size of at least a part of mesh holes on a side that is of the mesh fabric and that is close to the avoidance region is less than a hole size of at least a part of mesh holes on a side that is of the mesh fabric and that is away from the avoidance region.

9. The electronic device according to any one of claims 1 to 4, wherein the sound outlet channel is further provided with the sound outlet opening, the sound outlet opening is formed by a gap between an edge of the middle frame and an edge of the display, and a length-width ratio of the sound outlet opening is greater than or equal to 10.

10. The electronic device according to any one of claims 1 to 4, wherein the flow-guiding portion and the middle frame are an integrally formed mechanical part.

11. The electronic device according to any one of claims 1 to 4, wherein the speaker module comprises a diaphragm, and the diaphragm is disposed toward the communication hole.

12. The electronic device according to claim 11, wherein an area of the communication hole is greater than or equal to one-eighth of an area of the diaphragm.

13. The electronic device according to claim 11, wherein a sound inlet channel is formed between the diaphragm and the middle frame, and the sound inlet channel communicates with the sound outlet channel through the communication hole.

14. The electronic device according to any one of claims 1 to 4, wherein the electronic device further comprises a front-facing camera, and at least a part of a structure of the front-facing camera is mounted in the avoidance region; and / or the sound outlet channel is disposed around the avoidance region.

15. A middle frame, wherein the middle frame is provided with a first mounting groove and a second mounting groove, the first mounting groove and the second mounting groove are located on two sides of the middle frame that face away from each other, the first mounting groove is used for mounting of a display, and the second mounting groove is used for mounting of a speaker module; the middle frame is further provided with a sound outlet groove and a communication hole, the sound outlet groove is configured to form a sound outlet channel with the display, and the communication hole runs through the middle frame and communicates with the sound outlet groove; and the middle frame is further provided with a mounting hole and a flow-guiding portion, the mounting hole runs through the middle frame and is surrounded by the sound outlet groove, and the flow-guiding portion protrudes from a bottom wall of the sound outlet groove and is located between the communication hole and the mounting hole.

16. The middle frame according to claim 15, wherein the flow-guiding portion is a boss, and a surface that is of the flow-guiding portion and that faces the communication hole is a curved surface.

17. The middle frame according to claim 15 or 16, wherein the middle frame further comprises a flow-leading portion, the flow-leading portion is a boss, the flow-guiding portion protrudes from a boss surface of the flow-leading portion, and the surface that is of the flow-guiding portion and that faces the communication hole is close to the mounting hole relative to a surface that is of the flow-leading portion and that faces the communication hole.

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