Middle frame of electronic equipment, processing method and electronic equipment

Abstract

The embodiment of the invention discloses a middle frame of electronic equipment, a processing method of the middle frame and the electronic equipment, and the electronic equipment can comprise handheld equipment, vehicle-mounted equipment, wearable equipment and terminal equipment or can be connected to any one of a wireless modem, a cellular phone, a smart phone, a personal digital assistant, a computer, a tablet personal computer, a notebook computer and the like. According to the electronic equipment, the display module is located in the first mounting cavity, the sound channel and the first mounting cavity are relatively isolated and are not communicated, so that the display module and the sound channel are also relatively isolated, media such as oil in the sound channel are prevented from being in contact with the display module, the occurrence probability of the macular phenomenon is greatly reduced, and the display effect is improved. And the overall quality of the electronic equipment is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of communication equipment, and in particular, to a middle frame of an electronic device and a processing method thereof, and the electronic device. Background Art

[0002] Electronic devices are usually equipped with an earpiece, which is also called a receiver. Its main function is to convert electrical signals into sound. For example, when using an electronic device to make a call, the earpiece can transmit the other party's call voice.

[0003] The earpiece is usually installed inside an electronic device. In order to transmit the sound of the earpiece to the outside of the electronic device, the electronic device needs to be provided with a sound channel, through which the sound of the earpiece is transmitted to the outside of the electronic device. As electronic devices have more and more functions, the number of electronic components that make up the electronic components is also increasing. How to minimize the impact on other electronic components of the electronic device while ensuring that the sound channel can smoothly output the sound of the earpiece is one of the important issues that technicians in this field pay attention to in the design of electronic devices. Summary of the invention

[0004] Embodiments of the present application provide a middle frame of an electronic device and a processing method thereof, and an electronic device capable of reducing the yellow spot phenomenon.

[0005] The embodiment of the present application provides a middle frame of an electronic device, the electronic device includes a display screen and a sound unit, the display screen includes a transparent cover plate and a display module, and the sound unit has a sound cavity. The middle frame in the embodiment of the present application includes a partition and a peripheral wall, the peripheral wall is located in the circumference of the partition, the partition and the peripheral wall form a first installation cavity, the first installation cavity is located on one side of the partition, and the first installation cavity has an opening, the display module can be installed in the first installation cavity from the opening, the peripheral wall includes a sealing surface, the transparent cover plate of the display screen can be circumferentially sealed with the sealing surface, and the peripheral wall also includes a side surface located on the same side as the display screen.

[0006] In an embodiment of the present application, the middle frame is also provided with a sound channel, and the sound channel includes a sound inlet and a first sound outlet. The sound inlet can be connected to the sound cavity of the earpiece, and the first sound outlet is located on the side of the surrounding wall. The sound emitted from the sound cavity of the sound-emitting unit can propagate along the sound channel and finally diffuse from the first sound outlet on the surrounding wall to the outside of the middle frame. In the embodiment of the present application, the sound channel is relatively isolated from the first installation cavity.

[0007] In the embodiment of the present application, the display module is located inside the first installation cavity, and the sound channel is relatively isolated from the first installation cavity, and the two are not connected. In this way, the display module and the sound channel are also relatively isolated, blocking the oil and other media inside the sound channel from contacting the display module, greatly reducing the probability of the yellow spot phenomenon and improving the overall quality of the electronic device. In addition, the first sound outlet is located on the same side as the display screen, and the direction of the first sound outlet is toward the side where the display screen is located. This design conforms to the user's habit of holding a mobile phone in the usual way, making it easier for the user to answer the call.

[0008] In one example, a step surface is further provided on one side of the opening of the peripheral wall, and at least a portion of the step surface forms a sealing surface. The transparent cover is supported on the step surface, and the transparent cover is circumferentially sealed with the step surface. The first sound outlet is located on the side of the sealing surface away from the first installation cavity. That is, the side surface of the peripheral wall where the first sound outlet is provided is located outside the sealing surface, and the sealing surface can separate the first sound outlet and the first installation cavity.

[0009] In this embodiment, the transparent cover is supported on the step surface, and the peripheral wall located around the transparent cover can play a role in installation and positioning. The installation and fixing reliability is relatively high. In this embodiment, the transparent cover does not protrude from the peripheral wall as much as possible, thereby improving the appearance quality of the electronic device.

[0010] In one example, along the sound propagation direction, the sound channel includes a first hole segment and a second hole segment, and the first hole segment and the second hole segment are connected, wherein the first hole segment is at least partially located inside the partition, the sound inlet is located at the end of the first hole segment away from the second hole segment, the second hole segment is located inside the peripheral wall, and the end of the second hole segment away from the first hole segment forms a first sound outlet, and the second hole segment extends along the thickness direction of the electronic device.

[0011] In this embodiment, the sound channel includes two hole segments, which is easy to process, and the shapes and positions of the first hole segment and the second hole segment can be set according to the specific structure of the middle frame, and the setting flexibility is relatively high.

[0012] In one example, the receiver and the display screen are usually separated on both sides of the partition. When the first sound outlet is set on the side of the display screen, the first hole segment can be designed as an inclined hole segment, and the distance between the first hole segment and the plane where the display screen is located gradually decreases along the sound propagation direction. This makes it easier for the receiver sound to be transmitted to the first sound outlet on the side of the display screen, and when the first hole segment is injection molded, the inclined setting of the first hole segment makes it easier for the core used to mold the first hole segment to be extracted from the first hole segment to the outside of the middle frame.

[0013] In one example, the sound unit is installed offset to one side of the middle frame, so that the sound inlet on the middle frame is also offset to one side of the middle frame, that is, the sound inlet is offset to one side of the central longitudinal plane of the middle frame, and the projection of the first hole segment in the plane where the display screen is located is also inclined, that is, along the sound propagation direction, the distance between the first hole segment and the central longitudinal plane gradually decreases. In this way, the flexibility of setting other components in the electronic device is further improved. In addition, the first hole segment can propagate the sound of the sound cavity in the direction close to the central longitudinal plane of the middle frame, which is conducive to the uniform diffusion of the sound inside the second hole segment, so as to improve the sound quality transmitted to the outside of the electronic device.

[0014] In one example, the second hole segment includes a hole circumferential wall and a hole bottom wall, the hole bottom wall is connected to the lower end of the hole circumferential wall, the upper end of the hole circumferential wall forms a first sound outlet, the first hole segment passes through the hole circumferential wall of the second hole segment, the first hole segment is connected to the interior of the second hole segment through a connecting opening on the hole circumferential wall, the hole bottom wall is located on the side of the connecting opening away from the first sound outlet, and has a predetermined distance from the connecting opening.

[0015] That is to say, in the embodiment of the present application, the second hole segment also has a hole space below the connecting port, and the volume of the second hole segment is relatively large, which is conducive to improving the sound quality transmitted to the outside of the electronic device.

[0016] In one example, the sound channel also includes a third hole segment, and along the sound propagation direction, the third hole segment, the first hole segment and the second hole segment are connected in sequence, and the end of the third hole segment away from the first hole segment is a sound inlet, and the sound inlet completely covers the sound outlet surface of the sound cavity of the earpiece, and the third hole segment extends along the thickness direction of the electronic device, and the third hole segment is recessed to a predetermined depth from the sound inlet toward the first installation cavity.

[0017] In this example, the sound inlet is arranged opposite to the sound outlet surface of the sound cavity of the sound unit, and the sound inlet completely covers the sound outlet surface of the sound cavity. On the one hand, it is beneficial for the sound inside the sound cavity to enter the third hole segment. On the other hand, the first hole segment is connected to the earpiece sound cavity through the third hole segment. The third hole segment can increase the volume of the sound channel to a certain extent, which is beneficial to improving the sound quality transmitted to the outside of the electronic device.

[0018] In one example, the third hole section includes a groove bottom wall, which is opposite to the sound inlet and is roughly parallel to the plane where the display screen is located. In this way, the processing technology of the groove bottom wall is relatively simple and easy to implement.

[0019] In one example, the partition has a mounting surface, which is arranged on the side of the partition away from the first mounting cavity, and the mounting surface is located outside the sound inlet. The mounting surface can be sealed with the side wall on the sound outlet side of the earpiece, so that the sound in the sound cavity can completely enter the third hole segment, which is conducive to improving the intensity of the sound diffused to the outside of the electronic device, and in this example, the mounting surface and the plane (xy plane) where the display screen is located have a predetermined angle. Compared with the mounting surface of the earpiece parallel to the xy plane, in the embodiment of the present application, the mounting surface and the xy plane have a predetermined angle, so that the sound unit is in an inclined state after installation, and the end of the sound unit away from the first segment can be raised to a predetermined height toward the side of the display screen, and the positive and negative springs of the sound unit can be arranged in the space, thereby reducing the overall thickness of the electronic device. In addition, the inclined setting of the mounting surface is also conducive to the smooth pulling of the core for forming the first hole segment to the outside of the middle frame.

[0020] In one example, the middle frame further includes a plurality of positioning blocks, each of which is located in the circumference of the mounting surface, and the sound unit is mounted inside the space enclosed by the positioning blocks. The positioning blocks have a matching portion that matches and positions with the corresponding outer peripheral wall of the earpiece, and when the earpiece is assembled with the positioning blocks, the sound cavity sound outlet surface of the sound unit is arranged opposite to the sound inlet of the middle frame. In this way, the sound emitted from the sound cavity can completely enter the sound inlet, improving the sound quality diffused to the outside of the electronic device, and the positioning blocks can improve the installation reliability of the sound unit to a certain extent.

[0021] In one example, the middle frame at least includes a plastic body, the sound channel is located in the plastic body, and the sound channel is processed and molded on the plastic body for easy processing and molding.

[0022] In one example, at least the first hole section in the sound channel is integrally formed with the plastic body through an injection molding process, so that no subsequent machining is required and molding is fast.

[0023] In one example, the second hole segment is formed by a cutting process or a milling process, which can reduce the difficulty of injection molding.

[0024] In one example, the peripheral wall includes an outer peripheral surface, and the middle frame also includes a first sound outlet, and the first sound outlet is connected to the second hole segment and the outer peripheral surface. The first sound outlet is arranged at the top of the middle frame, so that the sound of the sound channel is diffused to the outside of the middle frame through the first sound outlet and the first sound outlet at the same time, which is conducive to achieving a three-dimensional stereo sound effect and improving the sound quality of the earpiece.

[0025] In one example, the first sound outlet is a slit structure, which is easy to process and has a good sound diffusion effect.

[0026] In one example, the sound-emitting unit includes any one of an earpiece, a speaker, or a microphone, or an integrated unit of several of them. For example, the sound-emitting unit is an integrated unit of an earpiece and a speaker, and the electronic device has a high degree of integration.

[0027] In a second aspect, an embodiment of the present application also provides an electronic device, which includes a middle frame and a display screen. The middle frame is any one of the middle frames described above. The display screen includes a transparent cover plate and a display module. The display module is located in the first installation cavity, and the transparent cover plate is circumferentially sealed with the sealing surface.

[0028] In a third aspect, an embodiment of the present application further provides a method for processing a middle frame, wherein the middle frame includes a metal body and a plastic body, and the processing method includes:

[0029] Pre-processing a metal body and a core for forming a first hole section;

[0030] Placing each metal body and the core at a corresponding position of the injection molding equipment, and forming the plastic body by injection molding process, so that the plastic body and the metal body form an integrated structure;

[0031] Pull the core to the outside of the middle frame;

[0032] The second hole section is machined on the plastic body by machining technology.

[0033] The electronic device provided in the embodiment of the present application includes the above-mentioned middle frame, and the processing method of the middle frame is based on the above-mentioned middle frame, so the electronic device and the processing method of the middle frame also have the above-mentioned technical effects of the middle frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the structure of an electronic device of current technology;

[0035] Figure 2 for Figure 1 A partial cross-sectional view of AA in the electronic device shown;

[0036] Figure 3 A partial cross-sectional view of an electronic device in another embodiment of the current technology;

[0037] Figure 4 for Figure 2 A schematic diagram of the arrangement of adhesive bonding between a display module and a middle frame in the electronic device shown, wherein the display module is not shown in the figure;

[0038] Figure 5 A schematic diagram of adhesive arrangement between a display module and a middle frame in another electronic device of the prior art, wherein the display module is not shown in the figure;

[0039] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0040] Figure 7 for Figure 6 A BB cross-sectional view of the electronic device shown;

[0041] Figure 8 for Figure 7 A partial enlarged schematic diagram of point D in the middle;

[0042] Fig. 9 for Figure 6 A partial enlarged view of point C in the middle;

[0043] Fig.10 for Figure 8 Schematic diagram of the assembly of the middle frame and the sound unit;

[0044] Fig.11 for Fig.10 The schematic diagram of the structure shown is in the F' direction, in which the sound generating unit is hidden;

[0045] Fig.12 for Fig.11 Middle GG schematic diagram;

[0046] Fig.13 for Figure 8 The structure shown only shows a schematic diagram of the middle frame;

[0047] Fig.14 A schematic diagram of setting a horizontal mounting surface for the middle frame;

[0048] Fig.15 for Fig.13 A schematic diagram showing a middle frame provided with an inclined mounting surface;

[0049] Fig.16 for Fig.10 The schematic diagram of the structure in the F direction is shown, in which the sound generating unit is hidden;

[0050] Fig.17 A schematic diagram of the structure of an electronic device provided in another embodiment of the present application;

[0051] Fig.18 for Fig.17 The HH cross-sectional view of the electronic device shown;

[0052] Fig.19 This is a structural schematic diagram of an electronic device in yet another embodiment of the present application;

[0053] Fig. 20 The approximate position of the core for forming the first hole segment is shown in FIG.

[0054] in, Figures 1 to 20 middle:

[0055] 1 middle frame; 1a first installation cavity; 101 peripheral wall; 1011 sealing surface; 1012 outer peripheral surface; 1013 side surface; 102 partition; 1021 positioning block; 1022 installation surface; 1-1 metal body; 1-2 plastic body;

[0056] 2 display screen; 21 transparent cover plate; 211 extension section; 22 display module;

[0057] 3 front cameras;

[0058] 4 sound unit; 41 sound cavity; 42 circumferential outer wall;

[0059] 5. Cover plate;

[0060] 6. Adhesive glue;

[0061] 7 back cover;

[0062] 8 adhesive layer;

[0063] 12 sound channel; 121 first hole section; 122 second hole section; 1221 hole bottom wall; 1222 hole peripheral wall; 12a first sound outlet; 12b sound inlet; 123 third hole section; 1231 hole bottom wall; 1211 communication port;

[0064] 9 core;

[0065] 10 shrapnel;

[0066] 11. Adhesive glue. DETAILED DESCRIPTION

[0067] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of an electronic device of the current technology. Figure 1 The electronic device 100 includes a middle frame 1 , a display screen 2 and a front camera 3 , and a first sound outlet 12 a of a sound channel 12 connected to a sound cavity (not shown) is arranged on one side of the display screen 2 .

[0068] Figure 2 and Figure 3 Two different sound channel 12 configurations of the current technology are given in FIG. Figure 2 and Figure 3 All of them are cross-sectional views of the position of the first sound outlet 12a in the current electronic equipment. The cross-sectional position and direction are the same as Figure 1 The AA section view position and direction are the same. Figure 2 and Figure 3 The middle dotted line indicates the approximate propagation path of the sound of the sound-emitting unit 4, where the sound-emitting unit 4 is a receiver. Figure 2 and Figure 3 The only difference is that the structure of the sound channel 12 near the earpiece is slightly different. Figure 2 and Figure 3 A cover plate 5 is provided between the receiver and the display screen to guide the sound transmission of the sound cavity. Figure 2 The middle cover plate 5 and the middle frame 1 are separate structures, and the cover plate 5 is installed on the middle frame 1. Figure 3 The cover plate 13 above the middle earpiece is an integral structure with the middle frame 1 .

[0069] from Figure 2 and Figure 3 As can be seen from the structure shown, the display screen 2 includes a transparent cover plate 21 and a display module 22 that are fixedly connected. The display module 22 is used to display images or videos. It is formed by stacking several functional layers, including a polarizing layer, a light-emitting layer, a touch layer, and a backlight layer. For the understanding of the composition of the display module 22 by those skilled in the art, Figure 2 and Figure 3 Only three layers are shown, and the number of functional layers of the display module 22 is not limited to that shown in the figure. In the current technology, the sound channel 12 is surrounded by a portion of the display module 22, a portion of the transparent cover plate 21, and the middle frame 1. A gap-type first sound outlet 12a is formed between the display screen 2 and the middle frame 1. The length of the first sound outlet 12a is approximately L. Figure 4 and Figure 5 The length of the middle frame 1 forming the first sound outlet 12a is shown in FIG. Because the first sound outlet 12a is connected to the external environment, when the electronic device 100 is in use, external oil will enter the electronic device 100 from the first sound outlet 12a and flow along the sound channel 12. When the oil flows to the side wall of the display module 22, it is easy to enter between the functional layers, thereby causing the yellow spot phenomenon, affecting the normal display of the display screen 2. Furthermore, when the oil entering from the first sound outlet 12a enters between the display module 22 and the transparent cover plate 21, the yellow spot phenomenon will also occur.

[0070] In addition, in the current technology, the display module 22 and the cover plate 5 are fixed by adhesive 6. Figure 3 and Figure 4 The arrangement of two adhesives 6 on the cover plate 5 is shown. Figure 4 The structure shown includes two adhesive strips 6, and the display module 22 is bonded and fixed to the cover plate 5 by the two adhesive strips 6. Figure 5 The structure shown includes a strip of adhesive 6, and the display module 22 is bonded and fixed to the cover plate 5 by the strip of adhesive 6. The oil will flow along the edge of the adhesive 6 and the gap 6a between the adhesives. Figure 1 It is understood that when the electronic device is provided with a front camera 3, the display module 22 is provided with an opening (not shown in the figure) at a position relative to the front camera 3. When the oil flows along the adhesive to the opening, the oil will also enter between the functional layers, further expanding the area where the yellow spot phenomenon occurs. Figure 4 and Figure 5 The dashed line S1 is the sound propagation path of the earpiece, and the dot-dash line S2 is the flow path of oil impurities.

[0071] Therefore, how to reduce the above-mentioned macular defects is a technical problem that needs to be solved urgently by technicians in this field.

[0072] On the basis of the above research findings, the inventors of the present application explored and carried out a large number of experiments, and proposed an electronic device that can effectively reduce the yellow spot phenomenon and help improve the quality of the entire device.

[0073] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present application, the embodiments of the present application are further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0074] The embodiments of the present application relate to an electronic device, wherein the electronic device may include a handheld device, an in-vehicle device, a wearable device, a terminal device or other processing devices connected to a wireless modem, and may also include a cellular phone, a smart phone, a personal digital assistant (PDA) computer, a tablet computer, a laptop computer, a camcorder, a video recorder, a camera, a smart watch, a smart wristband, an augmented reality (AR) device, a virtual reality (VR) device, an in-vehicle computer and other devices with a display screen. The embodiments of the present application do not impose any special restrictions on the specific form of the above-mentioned electronic device. For ease of understanding, the following is an explanation using the electronic device as a mobile phone as an example.

[0075] In order to simplify the description of the technical solution, this article defines the length direction of the electronic device as y, the width direction as x, and the thickness direction as z, where any two directions are perpendicular to each other.

[0076] Please refer to Figure 6 , the middle frame 1 of the electronic device 100 provided in the embodiment of the present application mainly plays the role of supporting and protecting the electronic devices of the electronic device. Various electronic devices of the electronic device can be arranged inside the middle frame 1. The electronic devices installed inside the middle frame 1 include a mainboard, a battery module, a wireless communication module, a camera module, an audio playback module, etc. The arrangement position and installation method of these electronic devices are not specifically limited in the embodiment of the present application. Among them, the audio playback module may include sound-emitting components such as a receiver and a speaker. Those skilled in the art should understand that the electronic device may include one or more of the electronic devices listed above, and of course may also include but are not limited to the electronic devices listed above in this article, and may also include other electronic devices.

[0077] Please refer to Figure 7In the embodiment of the present application, the middle frame 1 includes a metal body 1-1 and a plastic body 1-2. For example, the metal body 1-1 is used as a skeleton to form a plastic body by injection molding to form a middle frame 1 of an integrated structure. The metal body 1-1 can be made of aluminum alloy, stainless steel, titanium alloy, etc., and the plastic body 1-2 can be made of polystyrene, polypropylene, polyethylene, etc. Of course, if the use requirements are met, the middle frame 1 can also include only the plastic body 1-2, and the middle frame 1 can be formed by injection molding, or the middle frame 1 can also include only the metal body, and the middle frame 1 is formed by machining.

[0078] like Figure 7 As shown, the electronic device 100 may further include a back cover 7, and the display screen 2 and the back cover 7 are located on both sides of the middle frame 1 along its thickness direction z. The material of the back cover 7 is not limited here. In specific practice, technicians in this field may choose according to actual needs; for example, the back cover 7 may be made of metal, plastic, ceramic or glass, etc.

[0079] In the embodiment of the present application, the display screen 2 can be arranged on the front side of the electronic device 100, or on the back side of the electronic device, or on both the front side and the back side of the electronic device 100. The front side of the electronic device 100 can be understood as the side facing the user when the user uses the electronic device 100, that is, Figure 7 The back side of the electronic device 100 where the display screen is located can be understood as the side facing away from the user when the user uses the electronic device 100.

[0080] In the embodiment of the present application, the display module 22 of the display screen 2 can adopt a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode or an active-matrix organic light-emitting diode (AMOLED), a flexible light-emitting diode (FLED), a quantum dot light-emitting diode (QLED), an electrophoretic display technology (E-Ink), etc. As described above, the display module 22 includes several functional layers to realize image and video display. The number and specific structure of the functional layers can refer to the above description and the current technology, and are not described in detail herein. At present, the display screen 2 of the electronic device mostly adopts OLED. The transparent cover plate 21 covers the outside of the display module 22 to protect the display module 22. The transparent cover plate 21 can be a glass cover plate, and of course it can also be other transparent materials that can play a protective function, for example, the transparent cover plate 21 can be a transparent polyimide. The display screen 2 may also have a touch function, that is, the display screen 2 may be a touch screen.

[0081] Please refer to Figure 7 and Figure 8 , the transparent cover plate 21 in the display screen 2 completely covers the display module 22, and the outer contour of the transparent cover plate 21 is larger than the outer contour of the display module 22, and the transparent cover plate 21 has an extension section (not numbered in the figure) extending out of the display module 22 in the circumferential direction, and the extension section is supported on the middle frame 1. In an example, the middle frame 1 is provided with a sealing surface 1011 in the circumferential direction, and the extension section of the transparent cover plate 21 supports and seals with the sealing surface 1011. The extension section of the transparent cover plate 21 can be bonded and fixed to the sealing surface 1011 by an adhesive component such as an adhesive layer 8.

[0082] In the embodiment of the present application, the middle frame 1 includes a peripheral wall 101 and a partition 102, and the peripheral wall 101 is located in the circumference of the partition 102. In the embodiment of the present application, both the peripheral wall 101 and the partition 102 include a metal body 1-1 and a plastic body 1-2. One side of the partition 102 has a first installation cavity 1a, and one side of the first installation cavity 1a is open. The display screen 2 can be installed in the first installation cavity 1a, wherein the display module 22 of the display screen 2 can be installed inside the first installation cavity 1a from the opening, and the transparent cover plate 21 is located at the opening position of the first installation cavity 1a. The transparent cover plate 21 can be partially located inside the first installation cavity 1a, and of course the transparent cover plate 21 can also be completely located inside the first installation cavity 1a. The partition 102 forms the bottom wall of the first installation cavity 1a, and the peripheral wall 101 partially forms the circumferential wall of the first installation cavity 1a. The peripheral wall 101 partially extends to the other side of the partition 102, and can form a second installation cavity 1b on one side of the cover plate 7 for accommodating batteries or earpieces or other electronic devices. The transparent cover plate 21 is circumferentially sealed with the peripheral wall 101. As can be seen from the above description, in the embodiment of the present application, the display module 22 can be encapsulated in the enclosed space formed by the transparent cover plate 21 and the cavity wall of the first installation cavity 1a. The back side of the display module 22 can be further connected to the partition 102 by an adhesive 11, and the adhesive 11 can be a double-sided adhesive or a structural adhesive or a curable liquid adhesive.

[0083] Please continue to refer to Figure 7 and Figure 8 In the embodiment of the present application, the electronic device further includes a sound unit 4, which is installed on the side of the partition 102 away from the display screen 2, that is, the sound unit 4 and the display screen 2 are separated on both sides of the partition 102. The sound unit 4 can be a receiver, a speaker or other components capable of making sounds, or an integration of several of them. In the embodiment of the present application, the sound unit 4 is taken as an example of the receiver to introduce the technical scheme and technical effect. For mobile phones, in order to facilitate answering, the receiver is usually installed near the top of the mobile phone. Of course, the receiver can also be installed in other positions, depending on the structure of the specific electronic device 100. It should be noted that in the embodiment of the present application, "top" refers to the part of the electronic device that is above the electronic device when it is in use. Usually, in addition to the receiver, the front camera is also arranged near the top of the electronic device 100. The charging port of the electronic device is usually located at the end of the electronic device 100 opposite to the top, that is, the charging port is located at the bottom of the electronic device 100.

[0084] The sound unit 4 usually also has two springs (one spring is shown in the figure), which are respectively used to electrically connect to the positive feeding point and the grounding point of the circuit board (not shown), that is, the two springs are respectively the positive spring and the negative spring, and the two springs are electrically connected to the corresponding positions on the circuit board. The two springs are usually located on the side of the sound unit 4 close to the cover. The circuit board can be a main board.

[0085] In the embodiment of the present application, the middle frame 1 also includes a sound channel 12, and the sound emitted by the sound unit 4 can be propagated to the outside of the electronic device along the sound channel 12, that is, the sound channel 12 is used to conduct the sound emitted by the sound unit 4 to the outside of the electronic device 100. Specifically, the two ends of the sound channel 12 are respectively defined as a sound inlet 12b and a first sound outlet 12a, and the sound inlet 12b is located inside the middle frame 1, and is used to connect the sound cavity 41 of the sound unit 4, for example, the sound inlet 12b is located on the side of the partition 102 away from the display screen 2. The first sound outlet 12a is located on the outer surface of the middle frame 1, specifically, the first sound outlet 12a is on the same side as the display screen 2, and the first sound outlet 12a is located on the side 1013 of the peripheral wall 101, and the side 1013 is on the same side as the display screen 2. In this way, the sound in the sound cavity 41 of the sound unit 4 enters the sound channel 12 from the sound inlet 12b, propagates along the sound channel 12 to the first sound outlet 12a, and finally diffuses from the first sound outlet 12a to the outside of the electronic device 100. The size and shape of the sound inlet 12b can match the size and shape of the sound cavity 41 outlet, which is conducive to the sound in the sound cavity 41 to diffuse outward. The first sound outlet 12a can be a slit structure, and the slit extends along the x direction. Figure 6 and Fig. 9 In order to meet the sound effect of the electronic device, the sound gap of the electronic device has certain requirements. The length L1 (length extending along the x direction) and width w of the sound gap need to be reasonably set according to the sound requirements. For example, the width w of the sound gap is about 0.3 mm. For the case where the first sound outlet 12a forms a sound gap, the width of the first sound outlet 12a is equal to the sound gap. Please refer to Fig.19 ,in Fig.19 Sectional location and Figure 7 The middle BB position is the same, Fig.19 Only the partial structure at the cross-sectional position is shown. Fig.19 The electronic device of the embodiment shown in the figure has the first sound outlet 12a and Figure 7 In addition to the differences in the structure of the electronic devices shown, Fig.19 Other structures of the electronic device shown are Figure 7 The electronic devices shown are basically the same and will not be described in detail in this article.

[0086] When the transparent cover plate 21 and the middle frame peripheral wall 101 form a sound outlet gap, the width w1 of the first sound outlet 12a can be slightly larger than the sound outlet gap w. The sound outlet gap within the above width w can ensure the sound effect while preventing external dust and other impurities from entering the gap as much as possible.

[0087] Of course, the first sound outlet 12a may also be a plurality of independent holes (not shown) arranged at intervals. The number of the holes may be two or more, and the specific number is not limited as long as the sound output effect can be satisfied.

[0088] In the embodiment of the present application, the display module 22 is located inside the first installation cavity 1a, and the sound channel 12 is relatively isolated from the first installation cavity 1a, and the two are not connected. In this way, the display module 22 and the sound channel 12 are also relatively isolated, blocking the oil and other media inside the sound channel 12 from contacting the display module 22, thereby greatly reducing the probability of the yellow spot phenomenon and improving the overall quality of the electronic device.

[0089] In the embodiment of the present application, the first sound outlet 12a and the display screen 2 are located on the same side, so that the angle θ between the main sound direction of the first sound outlet 12a and the display screen 2 is less than 180°. Figure 8 The case where the angle between the two is approximately 90° is shown in the figure. Of course, the angle θ can also be other values, such as 70° to 150°, or other values ​​less than 180°. In the embodiment of the present application, the peripheral wall 101 has a side surface 1013, the side surface 1013 is located on the same side as the display screen 2, and the side surface 1013 is located on the periphery of the transparent cover plate 21. The first sound outlet 12a is at least partially located on the side surface 1013, so that the direction of the first sound outlet 12a is toward the side where the display screen 2 is located. This design conforms to the user's habit of holding a mobile phone in a conventional manner, which is convenient for the user to answer the call.

[0090] Please refer to Fig.10 In the embodiment of the present application, the sound channel 12 is located inside the middle frame 1, and the sound channel 12 includes a first hole segment 121 and a second hole segment 122 that are connected to each other. The first sound outlet 12a is arranged at an end of the second hole segment 122 away from the first hole segment 121, and the sound inlet 12a is located at an end of the first hole segment 121 away from the second hole segment 122. The extension direction of the first hole segment 121 has an angle β with the plane xy where the display screen 2 is located, as shown in FIG. Figure 8 As shown, the range of the angle β is approximately 9°. Along the sound propagation direction, the distance between the first hole segment 121 and the display screen 2 gradually decreases. In this way, when processing the first hole segment, the processing equipment can be inserted into or withdrawn from the middle frame 1 along the extension direction of the first hole segment 121, and the processing equipment can avoid other structures on the middle frame 1, thereby improving processing convenience.

[0091] The plane where the display screen described in the embodiment of the present application is located is a plane substantially parallel to the display surface of the display screen 2 .

[0092] The first hole segment 121 can be located in the plastic body of the middle frame 1. The first hole segment 121 is formed inside the plastic body through an injection molding process. In this way, the first hole segment 121 is formed while the middle frame 1 is being formed, and no subsequent processing is required, thereby simplifying the processing technology of the middle frame 1 and reducing the cost of using electronic equipment.

[0093] In order to facilitate pulling the core 9 for forming the first hole segment 121 to the outside of the middle frame, the first hole segment 121 may be a straight hole segment.

[0094] In the embodiment of the present application, the cross-sectional area of ​​the first hole segment 121 is greater than or equal to the cross-sectional area of ​​the sound cavity 41. The cross-sectional shape of the first hole segment 121 can be rectangular. For example, the cross-sectional area of ​​the sound cavity is 5 mm 2 , the cross-sectional dimensions of the rectangle are 5.2mmx1mm. Of course, the dimensions of the rectangle are not limited to those described herein, as long as the above requirements are met. In this embodiment, the cross-sectional dimensions of the first hole segment 121 are rectangular, and the processing is relatively simple. Of course, the cross-sectional dimensions of the first hole segment 121 are not limited to rectangles, and may also be circular or polygonal. Although the accompanying drawings do not show the cross-sectional dimensions of the first hole segment 121, it does not hinder the understanding of the present solution by those skilled in the art.

[0095] In the embodiment of the present application, in order to facilitate the use of answering, the center of the first sound outlet 12a is usually located on the central longitudinal plane P of the middle frame 1 (please refer to Figure 6 The central longitudinal plane P is a plane passing through the midpoint of the width of the middle frame and perpendicular to the display screen 2.

[0096] Due to the layout of the electronic components inside the middle frame 1, the sound unit 4 is offset and installed on one side of the central longitudinal plane P. Therefore, the extension direction of the first hole section 121 and the plane determined by yz have a predetermined angle θ1, and the range of θ1 is 10° to 20°. Please refer to Fig.12 , that is, the distances between the two ends of the first hole segment 121 and the central longitudinal plane P are different, and the distance between the communication opening 1211 between the first hole segment 121 and the second hole segment 122 and the central longitudinal plane is smaller than that between the end of the first hole segment 121 close to the sound unit 4. In other words, along the sound propagation direction, the distance between the first hole segment 121 and the central longitudinal plane P gradually decreases.

[0097] In this way, the first hole segment 121 can propagate the sound of the sound cavity 41 toward a direction close to the central longitudinal plane P, which is beneficial for uniform diffusion of the sound inside the second hole segment 122 , so as to improve the sound quality diffused to the outside of the electronic device 100 .

[0098] Please refer to Fig.13In the embodiment of the present application, the second hole segment 122 can be a groove structure, and the second hole segment 122 includes a hole peripheral wall 1222 and a hole bottom wall 1221. The outer end of the hole peripheral wall 1222 surrounds the first sound outlet 12a, and the hole bottom wall 1221 is connected to the inner end of the hole peripheral wall 1222. The connecting port 1211 connecting the first hole segment 121 and the second hole segment 122 is arranged on the hole peripheral wall 12. In the embodiment of the present application, the hole bottom wall 1221 is located on the side of the connecting port 1211 away from the first sound outlet 12a, and has a predetermined distance from the connecting port 1211, so that the second hole segment 122 also has a hole space below the connecting port 1211. The volume of the second hole segment 122 is relatively large, which is conducive to improving the sound quality transmitted to the outside of the electronic device 100.

[0099] In addition, considering the use strength, when designing the first hole segment 121 and the second hole segment 122, the wall thickness of the minimum thickness position of the middle frame 1 should be greater than or equal to 0.32 mm.

[0100] Please refer again Fig.13 In order to maximize the volume of the sound channel 12, in the embodiment of the present application, the sound channel 12 also includes a third hole segment 123, the third hole segment 123 is connected to the first hole segment 121 at a position away from the second hole segment 122, and the sound inlet 12b is arranged at one end of the third hole segment 123 away from the first hole segment 121, and the sound inlet 12b completely covers the sound outlet surface of the sound cavity 41, and the sound inlet 12b can have the same shape as the sound outlet surface of the earpiece sound cavity 41. Of course, the sound inlet 12b on the middle frame 1 can have a different shape from the sound outlet surface of the earpiece sound cavity 41, for example, the sound inlet 12b is square, the sound outlet surface is circular, the square outer contour is larger than the circular shape, or the sound inlet 12b and the sound cavity 41 are other shapes, as long as the sound inlet 12b can completely cover the sound outlet surface of the sound cavity, this is conducive to the transmission of the sound of the earpiece sound cavity to the third hole segment 123. The third hole section 123 is recessed by a predetermined depth from the sound inlet toward the first installation cavity 1a along the thickness direction (z direction) of the electronic device 100. In the embodiment of the present application, the third hole section 123 is substantially a cylindrical structure.

[0101] In the embodiment of the present application, the sound inlet 12b is arranged opposite to the sound outlet surface of the sound cavity 41 of the sound-emitting unit 4, and the sound inlet 12b completely covers the sound outlet surface of the sound cavity. On the one hand, it is beneficial for the sound inside the sound cavity 41 to enter the third hole segment 123. On the other hand, the first hole segment 123 is connected to the sound cavity 41 through the third hole segment 123. The third hole segment 123 can increase the volume of the sound channel 12 to a certain extent, which is beneficial to improving the sound quality diffused to the outside of the electronic device 100.

[0102] The bottom wall 1231 of the third hole section 123 opposite to the sound inlet can be a plane parallel to the plane where the display screen 2 is located, and the plane is easy to process. The bottom wall 1231 of the third hole section 123 opposite to the sound inlet forms a predetermined angle with the extension direction of the first hole section 121, and the angle is approximately equal to β.

[0103] In the embodiment of the present application, the thickness of the first section 121 of the partition 102 is relatively large. In order to reduce the thickness of the electronic device 100 as much as possible, it can be configured as follows.

[0104] Please refer to Fig.13 In the embodiment of the present application, the partition 102 has a mounting surface 1022 on the side away from the first mounting cavity 1a, and the sound inlet 12b is opened on the mounting surface 1022. After assembly, the mounting surface 1022 fits with the side wall of the sound cavity side of the sound unit 4. The mounting surface 1022 and the plane (xy plane) where the display screen 2 is located have a predetermined angle, and the range of the angle ɑ can be 4° to 6°, and the sound inlet 12b faces the direction of the first section.

[0105] The xy plane ( Fig.13 Compared with the horizontal direction in the middle, in the embodiment of the present application, the installation surface 1022 has a predetermined angle with the xy plane, so that the sound unit 4 is in an inclined state after installation, and the end of the sound unit 4 away from the first section can be lifted to the side of the display screen 2 by a predetermined height, thereby reducing the overall installation height of the sound unit 4, and thereby reducing the overall thickness of the electronic device 100.

[0106] in Fig.14 and Fig.15 The overall structure diagram of the middle frame with two different mounting surfaces 1022 is shown in FIG. Fig.14 The middle mounting surface 1022 is arranged to be parallel to the display screen 2. Fig.15 The middle mounting surface 1022 and the display screen 2 have a predetermined angle. Obviously, Fig.15 The left side of the middle sound unit 4 is raised by at least a height of h1, and a side of the sound unit 4 away from the partition 102 has a space, in which the positive and negative springs of the sound unit 4 can be arranged, making the structure of the electronic device 100 more compact and helping to reduce the thickness of the electronic device 100.

[0107] In addition, the inclined setting of the mounting surface 1022 is also conducive to the smooth pulling of the core 9 for forming the first hole section 121 to the outside of the middle frame 1. Fig. 20 understand.

[0108] The mounting surface 1022 and the side wall of the sound unit 4 can be fixed by adhesive (not shown in the figure) to achieve a sealed fixed connection, and the installation process is simple and the fixing is reliable. The adhesive can be a structural adhesive, or a viscous glue that can be cured into an adhesive layer, and of course, it can also be a double-sided adhesive. In an example, the mounting surface 1022 can be coated with viscous glue, and then the earpiece is bonded to the mounting surface.

[0109] Please refer again Fig.13 , Fig.16 It is understood that in the embodiment of the present application, the middle frame 1 further includes a plurality of positioning blocks 1021, which are located in the circumference of the mounting surface 1022. The plurality of positioning blocks 1021 surround the mounting space 1c of the earpiece, and the positioning blocks 1021 are used to cooperate with the corresponding circumferential outer wall 42 of the sound unit 4 for positioning. Specifically, the number of positioning blocks 1021 can be determined according to the shape of the sound unit 4, for example, three or four or more. The shapes of the positioning blocks can be the same or different.

[0110] The positioning block 1021 can be formed simultaneously with the plastic body during the injection molding process, or after the plastic body is formed, the matching surface on the positioning block 1021 can be finely machined and formed through a machining process.

[0111] The positioning block 1021 can be engaged with the corresponding structure of the circumferential outer wall 42 of the sound unit 4 to limit the position or have an interference fit, so as to further improve the reliability of the installation of the sound unit 4.

[0112] The present application also provides another embodiment of the electronic device, please refer to Fig.17 and Fig.18 , Fig.18 for Fig.17 HH cross-sectional view of this embodiment. Figure 7 The main difference between the embodiments shown is that Fig.17 and Fig.18 The electronic device shown is provided with a first sound outlet 12a' on the outer peripheral surface 1012 of the peripheral wall, the first sound outlet 12a' is connected to the second hole section 122 and the outer peripheral surface 1012 of the middle frame, the number of the first sound outlets 12a' can be several, all of which are arranged at the top of the middle frame 1 and arranged along the x direction.

[0113] In the embodiment of the present application, the sound of the sound channel 12 is diffused to the outside of the middle frame through the first sound outlet 12a and the first sound outlet 12a' at the same time, which is conducive to achieving a three-dimensional stereo effect and improving the sound quality of the earpiece.

[0114] Other structures in this embodiment are Figure 7 The structures of the electronic devices shown are the same and will not be further described.

[0115] In addition, in the embodiment of the present application, the sound unit 4 can be integrated with an earpiece and a speaker at the same time. The speaker is a component that uses the principle of electroacoustic transduction to vibrate and emit sound. The sound emitted by the speaker is transmitted to the sound channel after passing through the sound cavity, and is finally diffused and transmitted to the outside of the electronic device through the first sound outlet 12a, forming the external sound of the electronic device.

[0116] As described above, the middle frame 1 may include a plastic body 1-2, and the sound channel 12 may be completely formed on the plastic body 1-2. Compared with the sound channel 12 being provided on the metal body 1-1, it is easier to process the sound channel 12 on the plastic body 1-2. Figure 6 , Fig.18 The figures show an example in which the sound channel 12 is completely located on the plastic body.

[0117] Of course, the sound channel 12 may also be formed with only a partial hole section in the plastic body 1 - 2 , such as one or both of the first hole section 121 , the second hole section 122 , or the third hole section 123 .

[0118] As described above, the first hole segment 121 in the embodiment of the present application has an angle with respect to both the xy plane and the yz plane. If it is difficult to machine it, the injection molding process can be used to form it in one piece.

[0119] In the embodiment of the present application, the first hole segment 121 is integrally formed with the plastic body 1-2 by injection molding. Of course, if the process allows, the second hole segment 122 can also be integrally formed with the plastic body 1-2 by injection molding. The injection molding process is simple and efficient in molding each hole segment.

[0120] In order to reduce the difficulty of the injection molding process, the second hole segment 122 can also be obtained by removing the material at the corresponding position of the plastic body 1-2 through a machining process after the plastic body 1-2 is formed. For example, the machining process may include a milling process or a cutting process.

[0121] After machining to remove material, burrs may remain. In order to improve the inner wall surface accuracy of the second hole segment 122 , a tool such as a contoured plug having the same shape as the first hole segment 121 may be used to remove the burrs inside the second hole segment 122 .

[0122] Please refer to Fig. 20, for the implementation method in which the first hole segment 121 is formed by the injection molding process and the second hole segment 122 is machined to remove material, in order to ensure the connection between the first hole segment 121 and the second hole segment 122, the core 9 for molding the first hole segment 121 in the injection molding process can be partially located at the position where the second hole segment 122 is to be molded, and the length S of the core 9 extending into the second hole segment 122 can be about 0.25 mm. After the injection molding process, the positions except the core are all injected with plastic, and after the core is extracted, the first hole segment and the position of the second hole segment 122 close to the first hole segment 121 are all formed with a hole structure, that is, before the material is removed after the injection molding process, the first hole segment 121 and the second hole segment 122 are already connected.

[0123] For other structures of electronic devices, please refer to the current technology.

[0124] Based on the above electronic device, an embodiment of the present application further provides a method for processing a middle frame, including:

[0125] S1, pre-processing the metal bodies 1-1 constituting the middle frame and the core 9 adapted to the first hole section 121;

[0126] S2, placing each metal body 1-1 and the core 9 at the corresponding position of the injection molding equipment, and molding the plastic body 1-2 through the injection molding process, so that the plastic body 1-2 and each metal body 1-1 form an integrated middle frame;

[0127] A certain Z-direction gap is reserved between the core 9 and the metal body 1 - 1 to prevent the core 9 from colliding with the metal body during placement and subsequent pulling, and the gap is approximately in the range of 0.8 mm.

[0128] S3, pulling the core 9 out of the middle frame 1;

[0129] The end of the core 9 located at the injection molding body 1-2 can be connected to an external power device, and under the traction of the power device, the core 9 can be removed from the plastic body 1-2. In order to smoothly extract the core 9 to the outside of the middle frame 1, the core 9 has a single-side draft angle of about 0.5° in the extraction direction and the z-direction.

[0130] S4. Use machining to remove materials at corresponding positions of the plastic body 1 - 2 to form a second hole section 122 and a mounting surface 1022 that matches the sound unit 4 .

[0131] The second hole section 122 with a relatively small size can be cut by a relatively thin tool such as a blade.

[0132] In the above embodiment, when the mounting surface 1022 has a predetermined angle with the xy plane, the middle frame 1 can be placed at a predetermined tilt angle when machining the mounting surface 1022 to facilitate the extraction of the core 9 to the outside of the middle frame 1 .

[0133] In the embodiment of the present application, the processing method can form the middle frame 1 of the above structure, so the processing method of the middle frame 1 also has the above technical effects of the above middle frame 1.

[0134] In the description of this application, it should be noted that in the embodiments of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0135] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, "connected" can be detachably connected or non-detachably connected; it can be directly connected or indirectly connected through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship after connection remains unchanged.

[0136] The directional terms mentioned in the embodiments of the present application, such as "inside", "outside", etc., are only referenced to the directions of the drawings. Therefore, the directional terms used are for better and clearer description and understanding of the embodiments of the present application, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, unless otherwise specified in the present application, the "multiple" mentioned in the present application refers to two or more.

[0137] In the description of the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0138] In the embodiments of the present application, "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0139] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A middle frame of an electronic device, the electronic device comprising a display screen and a sound unit, characterized in that: include: a partition and a peripheral wall, wherein the peripheral wall is arranged around the partition in a circumferential direction so that the middle frame forms a first installation cavity with an opening, the peripheral wall has a circumferentially arranged sealing surface, the sealing surface is used for circumferential sealing with the transparent cover plate of the display screen, and the peripheral wall also includes a side surface located on the same side as the display screen; A sound channel is used to conduct the sound of the sound unit to the outside of the middle frame. The sound channel is isolated from the first installation cavity. The sound channel includes a sound inlet and a first sound outlet. The sound inlet is used to connect to the sound cavity of the sound unit. The first sound outlet is arranged on the side.

2. The middle frame of the electronic device according to claim 1, characterized in that: The peripheral wall has a stepped surface, the sealing surface is arranged on the stepped surface, the transparent cover is supported on the stepped surface, and the first sound outlet is located on a side of the sealing surface away from the first installation cavity.

3. The middle frame of the electronic device according to claim 1, characterized in that: The sound channel includes a first hole segment and a second hole segment connected, the first hole segment is at least partially located inside the partition, the second hole segment is located inside the peripheral wall and extends along the thickness direction of the electronic device, the first sound outlet is located at the end of the second hole segment away from the first hole segment, and the sound inlet is located at the end of the first hole segment away from the second hole segment.

4. The middle frame of the electronic device according to claim 3, characterized in that: Along the sound propagation direction, the distance between the first hole segment and the plane where the display screen is located gradually decreases.

5. The middle frame of the electronic device according to claim 3 or 4, characterized in that: The sound inlet is offset to one side of the central longitudinal plane of the middle frame, and along the sound propagation direction, the distance between the first hole segment and the central longitudinal plane gradually decreases.

6. The middle frame of the electronic device according to any one of claims 3 to 5, characterized in that: The second hole segment includes a connected hole peripheral wall and a hole bottom wall, the connecting opening connecting the first hole segment and the second hole segment is arranged on the hole peripheral wall, the hole bottom wall is located on the side of the connecting opening away from the first sound outlet, and has a predetermined distance from the connecting opening.

7. The middle frame of the electronic device according to any one of claims 3 to 6, characterized in that: The sound channel also includes a third hole segment, which is connected to the first hole segment at a position away from the second hole segment. The sound inlet is arranged at an end of the third hole segment away from the first hole segment. The sound inlet completely covers the sound outlet surface of the sound cavity of the sound unit. Along the thickness direction of the electronic device, the third hole segment is recessed by a predetermined depth from the sound inlet toward the first mounting cavity.

8. The middle frame of the electronic device according to claim 7, characterized in that: The bottom wall of the groove of the third hole section opposite to the sound inlet is parallel to the plane where the display screen is located.

9. The middle frame of the electronic device according to claim 7, characterized in that: The partition has a mounting surface on one side facing away from the first mounting cavity, which is used to seal with the side wall of the sound-emitting unit located on the sound output side. The mounting surface is arranged around the sound inlet, and has a predetermined angle with the plane where the display screen is located.

10. The middle frame of the electronic device according to claim 9, characterized in that: The middle frame also includes a plurality of positioning blocks, each of which is located in the circumference of the installation surface, and all of the positioning blocks surround the installation space of the sound unit. The positioning blocks are used to cooperate with the corresponding outer peripheral wall of the sound unit for positioning so that the sound outlet surface is arranged relative to the sound inlet.

11. The middle frame of the electronic device according to any one of claims 3 to 10, characterized in that: The middle frame at least includes a plastic body, and the sound channel is located in the plastic body.

12. The middle frame of the electronic device according to claim 11, characterized in that: At least the first hole segment is integrally formed with the plastic body through an injection molding process.

13. The middle frame of the electronic device according to claim 11, characterized in that: The second hole segment is formed by a cutting process or a milling process.

14. The middle frame of the electronic device according to any one of claims 3 to 13, characterized in that: The peripheral wall includes an outer peripheral surface, and the middle frame also includes a second sound outlet, and the second sound outlet communicates with the second hole segment and the outer peripheral surface.

15. The middle frame of the electronic device according to any one of claims 1 to 14, characterized in that: The first sound outlet is a slit structure.

16. An electronic device, characterized in that: include: The middle frame of the electronic device according to any one of claims 1 to 15; The display screen comprises a transparent cover plate and a display module, wherein the display module is located in the first installation cavity, and the transparent cover plate is circumferentially sealed with the sealing surface.

17. The electronic device according to claim 16, characterized in that: The sound-emitting unit includes an earpiece, a speaker, a microphone, or an integration of several of them.

18. A method for processing a middle frame of an electronic device according to any one of claims 3 to 15, characterized in that: The middle frame includes a metal body and a plastic body, including: Pre-processing the metal body and the core for forming the first hole segment; Placing each of the metal bodies and the core at corresponding positions of an injection molding device, and molding a plastic body by an injection molding process, wherein the plastic body and the metal body form an integral structure; Pulling the core to the outside of the middle frame; The second hole segment is machined on the plastic body by machining technology.

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