A middle frame, a manufacturing method thereof and an electronic device

Abstract

This application discloses a mid-frame and its manufacturing method, as well as an electronic device. The mid-frame includes a mid-plate structure, a sidewall structure, and a plastic portion. The sidewall structure is fitted onto the outside of the mid-plate structure and spaced apart by a first region. The sidewall structure includes an antenna slot and a first groove recessed from the edge of the antenna slot toward the interior of the sidewall structure. The antenna slot, the first groove, and the first region are connected. The plastic portion fills the antenna slot, the first groove, and the first region. Because the surface of the first groove is recessed to a certain depth relative to the surface of the antenna slot, the length of the iron-plastic bonding line formed between the sidewall structure and the plastic portion at the antenna slot is increased, thereby extending the liquid ingress path. Thus, when liquid penetrates through the iron-plastic bonding line at the antenna slot, due to the long ingress path, the liquid is unlikely to enter the interior of the mid-frame through the antenna slot, achieving an X8 level of waterproofing. Furthermore, the plastic portion can form an irregular stretching structure at the antenna slot to improve the bonding strength between the plastic portion and the sidewall structure. In this way, even if the electronic device is bent, squeezed or dropped, the plastic part and the side wall structure can still be tightly bonded, without compromising the airtightness of the electronic device, thereby improving the dustproof and waterproof capabilities of the electronic device.

Description

Technical Field

[0001] This application relates to the field of terminal equipment technology, and in particular to a mid-frame and its manufacturing method, and electronic equipment. Background Technology

[0002] Electronic devices typically have antenna slots along the metal frame of their casing. Multiple antenna slots can be installed, with the antenna positioned close to them. These slots provide a channel for the antenna to transmit or receive signals. Furthermore, to improve the airtightness of the electronic device and ensure its dust and water resistance, insulating plastic is usually filled into the antenna slots, and this insulating plastic is tightly bonded to the metal frame at the antenna slot.

[0003] However, during the assembly and manufacturing process or during use, electronic devices may be bent, squeezed, or dropped. This may cause the insulating plastic filling the antenna seams to lose its tight bond with the metal frame, thereby compromising the airtightness of the electronic device and reducing its dustproof and waterproof capabilities. Summary of the Invention

[0004] This application provides a mid-frame and its manufacturing method, as well as an electronic device, to solve the problem of poor waterproofing capability of existing mid-frames.

[0005] In a first aspect, this application provides a mid-frame, comprising: a mid-plate structure, a sidewall structure, and a plastic portion. The sidewall structure is fitted onto the outside of the mid-plate structure and spaced apart by a first region. The sidewall structure includes an antenna slot and a first groove recessed from the edge of the antenna slot toward the interior of the sidewall structure. The antenna slot, the first groove, and the first region are connected. The plastic portion fills the antenna slot, the first groove, and the first region.

[0006] The mid-frame provided in this embodiment has a sidewall structure fitted onto the outside of the mid-plate structure and spaced apart by a first region. The sidewall structure includes an antenna slot and a first groove. A plastic portion continuously fills the interconnected antenna slot, the first groove, and the first region to form the mid-frame. Because the surface of the first groove is recessed to a certain depth relative to the surface of the antenna slot, the length of the iron-plastic bonding line formed between the sidewall structure and the plastic portion at the antenna slot is increased, thereby extending the liquid ingress path. Thus, when liquid permeates through the iron-plastic bonding line at the antenna slot, due to the long ingress path, it is difficult for the liquid to enter the interior of the mid-frame through the antenna slot, achieving an X8 level of waterproofing. Furthermore, the plastic portion can form an irregular adhesive-stretched structure at the antenna slot to improve the bonding strength between the plastic portion and the sidewall structure. Therefore, even if the electronic device is bent, squeezed, or dropped, the plastic portion and the sidewall structure can still be tightly bonded, without compromising the airtightness of the electronic device, thereby improving the dustproof and waterproof capabilities of the electronic device.

[0007] In some implementations, there are multiple first grooves; these multiple first grooves are spaced apart along a first direction at the edge of the antenna slot; the first direction is the thickness direction of the mid-frame. Thus, during subsequent injection molding of the plastic part, the multiple first grooves can form a stretching structure to improve the bonding strength between the plastic part and the sidewall structure.

[0008] In some implementations, at least one first groove penetrates the first and second surfaces of the sidewall structure, and the first groove is recessed into the sidewall structure to a first depth along a second direction; the second direction is the length direction of the mid-frame, the first surface faces the display screen of the electronic device, the second surface faces the mid-plate structure, and the first surface and the second surface are connected. Thus, a structural form of the first groove is provided, the first groove being located at the top of the sidewall structure facing the display screen, to form a stretched structure after subsequent injection molding.

[0009] In some implementations, at least one first groove penetrates the second surface of the sidewall structure; the first groove is recessed into the sidewall structure to a second depth along a second direction; the second direction is the length direction of the middle frame, and the second surface faces the middle plate structure. Another structural form of the first groove is provided, wherein the first groove is located in the middle region along the thickness direction of the sidewall structure to form a stretched structure after subsequent injection molding.

[0010] In some implementations, the sidewall structure further includes: a second groove; the second groove is located along a second direction on the side of the first groove opposite to the antenna slot, and the second groove is connected to both the first groove and the first region; the second direction is the length direction of the mid-frame; the plastic part fills the antenna slot, the first groove, the second groove, and the first region. This allows for the formation of a ring-shaped adhesive structure at the antenna slot after subsequent injection molding, increasing the strength of the antenna slot and preventing minor cracking between the plastic part and the sidewall structure due to deformation or drops of electronic devices during user operation, thus preventing a deterioration in waterproof sealing.

[0011] In some implementations, the first groove penetrates the first and second surfaces of the sidewall structure; the second groove penetrates the second and third surfaces of the sidewall structure; the first surface faces the display screen of the electronic device, the second surface faces the middle plate structure, and the third surface faces the rear shell of the electronic device; the first surface is connected to the second surface, and the second surface is connected to the third surface. In this way, the first and second grooves can be set at different positions on the sidewall structure, and their interconnectedness allows for the formation of an annular adhesive-stretching structure at the first and second grooves during subsequent injection molding.

[0012] In some implementations, the sidewall structure includes suspended spurs and other spurs; the other spurs include breaks, with the suspended spurs located at the breaks to form antenna slots with the other spurs; the sides of the suspended spurs and the other spurs each include a first groove. This allows antenna slots to be formed at different locations on the midframe, and the first grooves are used to form a stretchable structure after injection molding, thereby improving the bonding strength between the plastic part and the sidewall structure.

[0013] In some implementations, one end of the adjacent middle plate structure of the suspended branch and other branches respectively includes a boss; the first groove is surrounded by the boss and the corresponding suspended branch body or other branch body; the plastic part surrounds the boss, and the boss is exposed from the surface of the plastic part. In this way, the boss can be used to conduct electricity when the middle frame is colored by anodizing after injection molding, and the plastic part surrounding the boss can also improve the bonding strength between the plastic part and the side wall structure.

[0014] In some implementations, the plastic part includes a dispensing area; the dispensing area is continuously formed between the boss and the sidewall structure. This ensures that the plastic part is continuously formed in the dispensing area, eliminating the iron-plastic bonding line. The dispensing area isolates the antenna slot from the interior, making it difficult for liquids from the external environment to enter the interior through the antenna slot, achieving an X8 level of waterproofing.

[0015] In some implementations, the two opposing surfaces of the antenna slot each include a first groove; the width of the area enclosed by the two opposing first grooves is greater than the width of the antenna slot. This allows for the formation of a stretched adhesive structure on both opposing surfaces of the antenna slot, further enhancing the bonding strength between the plastic portion and the sidewall structure.

[0016] Secondly, this application provides a method for manufacturing a mid-frame, used to manufacture the mid-frame provided in the first aspect. The method includes: providing a metal sheet; performing structural processing on the metal sheet to obtain a mid-frame blank; the mid-frame blank includes a mid-plate blank, side-wall blanks, and a connecting structure, the side-wall blanks being arranged around the outside of the mid-plate blank and spaced apart by a first region; the side-wall blanks including an antenna slot and a first groove recessed from the edge of the antenna slot toward the interior of the side-wall blank, the connecting structure being located on the side of the first groove opposite to the antenna slot and connecting the side-wall blank and the mid-plate blank; injecting plastic portions into the antenna slot, the first groove, and the first region; after injection molding, removing the connecting structure using CNC machining; and performing surface feature processing on the mid-plate blank and the side-wall blank to obtain the mid-frame.

[0017] The method for manufacturing the mid-frame provided in this application involves a method where the surface of the first groove is recessed to a certain depth relative to the surface of the antenna slot. This causes a portion of the plastic part to extend inward into the sidewall structure, increasing the length of the iron-plastic bonding line formed between the sidewall structure and the plastic part at the antenna slot, thereby extending the liquid ingress path. Thus, when liquid penetrates through the iron-plastic bonding line at the antenna slot, the longer ingress path allows for an X8 level of waterproofing. Furthermore, the plastic part can form an irregular stretching structure at the antenna slot to improve the bonding strength between the plastic part and the sidewall structure. Therefore, even when the electronic device is bent, squeezed, or dropped, the plastic part and the sidewall structure can still maintain a tight bond, without compromising the airtightness of the electronic device, thereby improving its dustproof and waterproof capabilities.

[0018] In some implementations, the sidewall blank further includes a second groove, which is offset from the first groove along a second direction. The second groove communicates with both the first groove and the first region. The second direction is the length direction of the mid-frame. Additionally, a plastic injection molded portion is formed at the antenna seam, the first groove, and the first region. This allows for the formation of a ring-shaped adhesive structure at the antenna seam, increasing the strength of the antenna seam and preventing minor cracking between the plastic portion and the sidewall structure due to deformation or drops of electronic devices during user operation, thus preventing a deterioration in waterproof sealing.

[0019] In some implementations, the sidewall blank includes a suspended branch blank and other branch blanks; the other branch blanks include a break, with the suspended branch blank located at the break to form an antenna slot with the other branch blanks; the opposite sides of the suspended branch blank and the other branch blanks each include a first groove, and a boss located on one side of the first groove; and a plastic part is injection molded in the antenna slot, the first groove, and the first region, including: a plastic part is injection molded in the antenna slot, the first groove, and the first region, the plastic part surrounding the boss. In this way, the boss can be used to conduct electricity when the middle frame is colored using an anodizing process after injection molding, and the plastic part surrounding the boss can also improve the bonding strength between the plastic part and the sidewall structure.

[0020] In some implementations, the connecting structure links the bosses of the slab blank and the sidewall blank; and after injection molding, the connecting structure is removed using CNC machining, including: removing the connecting structure using CNC machining after injection molding to expose the boss. In this way, the boss is surrounded by the plastic part to improve the bonding strength between the plastic part and the sidewall structure.

[0021] Thirdly, embodiments of this application also provide an electronic device, including a display screen, a rear cover, and a mid-frame as provided in the first aspect; the display screen and the rear cover are located on opposite sides of the mid-frame and are connected to the mid-frame.

[0022] Understandably, the electronic device provided by the third aspect is applied to the mid-frame provided above, and therefore, the beneficial effects it can achieve can be referred to the beneficial effects of the mid-frame provided above, which will not be repeated here. Attached Figure Description

[0023] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application;

[0025] Figure 2 This is a schematic diagram of the structure of the middle frame provided in an embodiment of this application;

[0026] Figure 3 yes Figure 2 Schematic diagram of the structure of region A1 in the middle;

[0027] Figure 4 This is the first structural schematic diagram of the middle frame blank provided in the embodiments of this application;

[0028] Figure 5 This is a second structural schematic diagram of the middle frame blank provided in the embodiments of this application;

[0029] Figure 6 This is a flowchart of the method for manufacturing the middle frame provided in the embodiments of this application;

[0030] Figure 7 This is the first process flow diagram of the method for manufacturing the middle frame provided in the embodiments of this application;

[0031] Figure 8 This is a process flow diagram of the stamping and forging process provided in the embodiments of this application;

[0032] Figure 9 This is a schematic diagram of the forging process provided in the embodiments of this application;

[0033] Figure 10 This is a schematic diagram of the structure of the display screen and the middle frame provided in the embodiments of this application;

[0034] Figure 11 yes Figure 2 Schematic diagram of the structure of region A2 in the middle;

[0035] Figure 12 This is a third structural schematic diagram of the middle frame blank provided in the embodiments of this application;

[0036] Figure 13 This is the fourth structural schematic diagram of the middle frame blank provided in the embodiments of this application;

[0037] Figure 14 This is a schematic diagram of the annular adhesive-stretching structure provided in the embodiments of this application;

[0038] Figure 15 This is the second process flow diagram of the method for manufacturing the middle frame provided in the embodiments of this application;

[0039] Figure 16 yes Figure 2 Schematic diagram of the structure of region A3 in the middle;

[0040] Figure 17 This is a schematic diagram of the first partial structure of the middle frame provided in the embodiments of this application;

[0041] Figure 18 This is a second partial structural diagram of the middle frame provided in an embodiment of this application;

[0042] Figure 19 This is the third process flow diagram of the method for manufacturing the middle frame provided in the embodiments of this application.

[0043] Illustration:

[0044] Among them, 10 is the display screen, 20 is the middle frame, and 21 is the antenna slot structure;

[0045] 30-Mid-frame;

[0046] 100 - Middle plate structure, 101 - First region;

[0047] 200-Sidewall structure, 201-Antenna slot, 202-First groove, 203-Second groove, 204-Boss, 210-Suspended branch, 220-Other branches, 221-Break;

[0048] 300 - Plastic part, 301 - Dispensing area;

[0049] 400 - Metal sheet material, 400a - Rounded corners, 400b - Stamped billet outline, 400c - Product metal outline, 400d - Product plastic outline, 401 - Medium plate billet, 402 - Side wall billet, 4021 - Suspended branch billet, 4022 - Other branch billets, 402a - First surface, 402b - Second surface, 402c - Third surface, 403 - Connecting structure. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the protection scope of this application.

[0051] In the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0052] Furthermore, in this application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0053] The electronic devices described in this application include, but are not limited to, mobile phones, laptops, tablets, personal digital assistants, or wearable devices. The following description uses a mobile phone as an example.

[0054] Figure 1 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application.

[0055] like Figure 1 As shown, the electronic device may include a display screen 10, a mid-frame portion 20, and a rear cover. The display screen 10 and the rear cover are located on opposite sides of the mid-frame portion 20. The display screen 10, the mid-frame portion 20, and the rear cover are sequentially fastened together to form the entire device cavity.

[0056] To facilitate the explanation of the positions of various components in the electronic device, this application embodiment exemplarily establishes a three-dimensional coordinate system based on the electronic device, wherein the x-axis direction is the width direction of the electronic device, the y-axis direction is the length direction of the electronic device, and the z-axis direction is the thickness direction of the electronic device.

[0057] It should be noted that the entire cavity contains components such as a communication module, circuit board, battery, speaker assembly, and camera assembly, which will not be listed here.

[0058] The communication module implements communication functions through antenna arrays, mobile communication modules, wireless communication modules, modem processors, and baseband processors. The antenna array typically includes multiple antennas to enable both mobile and wireless communication functions. Specifically, the antenna array is used to transmit and receive electromagnetic wave signals.

[0059] To strengthen the body of electronic devices and improve their appearance and texture, the mid-frame 20 is generally made of metal frame, and an antenna slot structure 21 is set at the metal frame. Multiple antenna slot structures 21 can be set, and the antenna is positioned close to the antenna slot structure 21. The antenna slot structure 21 provides a channel for the antenna to transmit or receive signals.

[0060] To avoid signal shielding and to improve the airtightness of electronic devices, as well as to ensure their dustproof and waterproof capabilities, insulating plastic (not shown in the figure) is generally filled at the antenna slot structure 21. The insulating plastic is tightly bonded to the frame at the antenna slot structure 21.

[0061] However, during the assembly and manufacturing process or during use, electronic devices may be bent, squeezed, or dropped. This may cause the insulating plastic filling the antenna slot structure 21 to no longer be tightly bonded to the metal frame, thereby compromising the airtightness of the electronic device and reducing its dustproof and waterproof capabilities.

[0062] Currently, there are two common manufacturing methods for the middle frame 20: one is fully computerized numerical control (CNC) machining of the middle frame 20, where a single piece of material is CNC milled into the middle frame feature; this method has no limitation on material thickness. The other is welding the middle frame 20, where an outer frame made of CNC profile aluminum and an inner frame made of die-cast aluminum are welded together to form the middle frame feature. While both methods can achieve the desired appearance of the metal middle frame, they are expensive.

[0063] To address the aforementioned technical problems, this application provides a mid-frame and its manufacturing method. The mid-frame is processed using a stamping and forging process, which can reduce costs. A glue-stretching structure is formed at the antenna seam, which can improve the tightness of the bonding between the insulating plastic and the metal frame, thereby improving the airtightness of the electronic device and meeting the X8 waterproof rating.

[0064] Figure 2 This is a schematic diagram of the structure of the middle frame provided in the embodiment of this application.

[0065] like Figure 2 As shown, in some embodiments, the middle frame 30 provided in this application embodiment may include: a middle plate structure 100, a side wall structure 200, and a plastic part 300.

[0066] Both the middle plate structure 100 and the side wall structure 200 are made of metal. The middle plate structure 100 can serve as the metal middle plate of the middle frame 30, and the side wall structure 200 can serve as the metal frame of the middle frame 30. The plastic part 300 is made of insulating plastic.

[0067] The mid-plate structure 100 serves as the phone's frame, supporting core components such as the motherboard, battery, and camera, and dispersing external impact forces. The sidewall structure 200 connects the mid-plate structure 100 to the display screen 10 and back cover of the electronic device, and withstands mechanical stresses such as drops and compression. The plastic part 300 fills the breaks in the metal frame (antenna seams), forming a non-conductive area; it can also absorb drop impacts, preventing the metal frame from shattering upon direct contact with the glass of the display screen 10.

[0068] Multiple antenna slots are formed on the sidewall structure 200, and part of the plastic part 300 fills these slots. The multiple antenna slots can be located at... Figure 2 The regions A1 to A7 shown can also be located in other regions. The structure of the antenna slots in different regions can be the same or different, and this is not limited here.

[0069] Figure 3 yes Figure 2 Schematic diagram of the structure of region A1 in the middle; Figure 4 This is the first structural schematic diagram of the middle frame blank provided in the embodiments of this application. Wherein, Figure 3 The pattern fill is only used to show the area of ​​the side wall structure 200.

[0070] Combination Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the middle plate structure 100 and the side wall structure 200 can be formed by CNC machining the surface features of the middle frame blank. The middle frame blank includes the middle plate blank 401 and the side wall blank 402. For details, please refer to the following manufacturing method embodiments. They will not be repeated here.

[0071] The side wall structure 200 is a ring structure. The side wall structure 200 can be fitted onto the outside of the middle plate structure 100 and separated by the first region 101. The side wall structure 200 and the middle plate structure 100 inside it are not directly connected, but are separated by a certain distance and enclose the first region 101.

[0072] The sidewall structure 200 includes an antenna slot 201 and a first groove 202 recessed into the sidewall structure 200 from the edge of the antenna slot 201. The antenna slot 201 connects the external environment and the inside of the sidewall structure 200, and the first groove 202 is located inside the sidewall structure 200.

[0073] The two opposing surfaces of the antenna slot 201 may each include a first groove 202. The two first grooves 202 are located on opposite sides of the antenna slot 201 along the y-axis and are symmetrical with respect to the antenna slot 201. The width of the area enclosed by the two opposing first grooves 202 is greater than the width of the antenna slot 201, such that the edges of the two first grooves 202 are far away from the surface of the antenna slot 201.

[0074] Figure 5 This is a second structural schematic diagram of the middle frame blank provided in an embodiment of this application. Wherein, Figure 4 and Figure 5 The structure is shown from different perspectives.

[0075] Combination Figure 4 and Figure 5 As shown, for the structure of the first groove 202 located on one side of the antenna slot 201, there are multiple first grooves 202; the multiple first grooves 202 are spaced apart along a first direction at the edge of the antenna slot 201; the first direction is the thickness direction (z-axis direction) of the middle frame 30. For example, one side surface of the antenna slot 201 includes multiple first grooves 202 spaced apart along the z-axis, and the opposite side surface of the antenna slot 201 also includes multiple first grooves 202 spaced apart along the z-axis, and the structures of the various first grooves 202 included on the opposite two side surfaces of the antenna slot 201 are symmetrical.

[0076] In other words, in the z-axis direction, the surface of the antenna slot 201 is not a smooth surface, but a surface with different groove structures. In this way, when the plastic part 300 is subsequently injection molded, a stretching structure can be formed to improve the bonding strength between the plastic part 300 and the sidewall structure 200.

[0077] On the same side surface of the antenna slot 201, the structures of each first groove 202 can be different. At least one first groove 202 penetrates the first and second surfaces of the sidewall structure 200, which are formed by surface feature processing of the first surface 402a and the second surface 402b of the sidewall blank 402, respectively. For example, the first groove 202 located at the top may penetrate the first surface 402a and the second surface 402b of the sidewall structure 200 (sidewall blank 402). At least one first groove 202 penetrates the second surface 402b of the sidewall structure 200 (sidewall blank 402), and for example, each first groove 202 located in the middle penetrates the second surface 402b of the sidewall structure 200.

[0078] The second direction is the length direction (y-axis direction) of the middle frame 30, the first surface 402a faces the display screen 10 of the electronic device, the second surface 402b faces the middle plate structure 100 (middle plate blank 401), and the first surface 402a and the second surface 402b are connected.

[0079] Antenna slot 201, first groove 202, and first region 101 are connected. Plastic portion 300 continuously fills the antenna slot 201, first groove 202, and first region 101 to form the structure of the middle frame 30 in region A1, as shown below. Figure 3 The structure shown.

[0080] The first groove 202 located at the top is recessed into the sidewall structure 200 (sidewall blank 402) along the second direction to a first depth L1, and the first groove 202 located in the middle is recessed into the sidewall structure 200 (sidewall blank 402) along the second direction to a second depth L2; the first depth L1 is less than the second depth L2. That is, the surface of each first groove 202 is not on the same plane as the surface of the antenna slot 201, but the surface of the first groove 202 is recessed inward relative to the surface of the antenna slot 201 by a first depth L1 or a second depth L2. For example, the first depth L1 is at least 1 mm.

[0081] In this way, after the injection molding of the plastic part 300, a portion of the plastic part 300 extends into the interior of the sidewall structure 200, increasing the bonding length between the sidewall structure 200 and the plastic part 300 at the antenna slot 201, i.e., the length of the iron-plastic bonding line (reaching 1.5mm or more), thereby extending the liquid ingress path. When liquid penetrates through the iron-plastic bonding line at the antenna slot 201, the long ingress path allows for an X8 level of waterproofing. Furthermore, the plastic part 300 can form an irregular adhesive-stretched structure at the antenna slot 201, improving the bonding strength between the plastic part 300 and the sidewall structure 200.

[0082] The mid-frame 30 provided in this embodiment has a sidewall structure 200 fitted onto the outside of the mid-plate structure 100 and spaced apart by a first region 101. The sidewall structure 200 includes an antenna slot 201 and a first groove 202, the first groove 202 being recessed from the edge of the antenna slot 201 toward the interior of the sidewall structure 200. A plastic portion 300 continuously fills the interconnected antenna slot 201, the first groove 202, and the first region 101 to form the mid-frame 30. Because the surface of the first groove 202 is recessed to a certain depth relative to the surface of the antenna slot 201, a portion of the plastic portion 300 extends toward the interior of the sidewall structure 200, increasing the length of the iron-plastic bonding line formed between the sidewall structure 200 and the plastic portion 300 at the antenna slot 201, thereby extending the liquid ingress path. Thus, when liquid penetrates through the iron-plastic bonding line at the antenna slot 201, due to the long ingress path, it is difficult for the liquid to enter the interior of the mid-frame 30 via the antenna slot 201, achieving an X8 level of waterproofing. Furthermore, the plastic part 300 can form an irregular adhesive-stretched structure at the antenna seam 201 to improve the bonding strength between the plastic part 300 and the side wall structure 200. In this way, even if the electronic device is bent, squeezed, or dropped, the plastic part 300 and the side wall structure 200 can still be tightly bonded without compromising the airtightness of the electronic device, thereby improving the dustproof and waterproof capabilities of the electronic device.

[0083] Figure 6 This is a flowchart of the method for manufacturing the middle frame provided in the embodiments of this application; Figure 7 This is the first process flow diagram of the method for manufacturing the middle frame provided in the embodiments of this application.

[0084] like Figure 6 As shown, in some embodiments, the method for manufacturing the middle frame provided in this application is used to manufacture the middle frame 30 provided in the aforementioned embodiments. The method for manufacturing the middle frame may include the following steps S101-S104:

[0085] Step S101: Provide metal sheet material.

[0086] like Figure 7 As shown in (a), the metal sheet 400 can be a plate-like structure made of metal, and the metal sheet 400 does not have any special surface structure features.

[0087] Step S102: Perform structural processing on the metal sheet to obtain the middle frame blank.

[0088] The structural processing can be achieved by combining stamping and forging with CNC machining. For example, the metal sheet 400 is first stamped into a box-shaped blank using stamping and forging; then, the structural features are machined on the box-shaped blank using CNC machining to obtain the middle frame blank.

[0089] In other embodiments, the metal sheet 400 can be stamped into a box-shaped blank using a forging process, and then structural features can be machined on the box-shaped blank to obtain the middle frame blank. It should be noted that the embodiments of this application do not limit the method of machining the middle frame blank.

[0090] Figure 8 This is a process flow diagram of the stamping and forging process provided in the embodiments of this application.

[0091] like Figure 8 As shown in the two images on the left, the metal sheet 400 has a cuboid structure and a thickness h0 of approximately 2mm to 3mm.

[0092] like Figure 8 As shown in the two middle pictures, the rounded corners 400a are machined on the metal sheet 400 using a stamping and forging process. The rounded corners 400a correspond to the four corners of the middle frame 30.

[0093] like Figure 8 As shown in the two figures on the right, the metal sheet 400 with rounded corners 400a is then stamped into a box shape using a forging process to obtain a box-shaped blank. The box-shaped blank includes a middle plate blank 401 and side wall blanks 402 surrounding the edge of the middle plate blank 401. At this stage, the middle plate blank 401 and the side wall blanks 402 do not have any special structural features.

[0094] Figure 9 This is a schematic diagram of the forging process provided in the embodiments of this application.

[0095] Combination Figure 7 (b) and Figure 9 As shown, CNC machining is used to process structural features on a box-shaped blank to obtain a middle frame blank. The middle frame blank may include a middle plate blank 401, a side wall blank 402, and a connecting structure 403. Both the middle plate blank 401 and the side wall blank 402 have structural features.

[0096] Before the box-shaped blank undergoes CNC machining, the forging profile of the box-shaped blank is as follows: 400b Figure 9 The blank area is shown in the figure; after the structural features of the box-shaped blank are completed by CNC machining, the metal outline of the product 400c is obtained, as shown in the figure. Figure 9 As shown in the filled area, the product metal outline 400c is the outline of the middle plate blank 401 and the side wall blank 402 with structural features. After the injection molding is completed, the product plastic outline 400d corresponding to the plastic part 300 is as follows. Figure 9 The filled area is shown in the figure.

[0097] The structural features include, but are not limited to, antenna clearance (not shown in the figure), antenna slot 201, first groove 202, connecting structure 403, and first region 101 between sidewall blank 402 and middle plate blank 401. The area of ​​the first region 101 at the antenna slot 201 can be regarded as antenna clearance.

[0098] In order to ensure that the antenna slot 201 has a certain strength before injection molding, the embodiment of this application provides a connecting structure 403 between the middle plate blank 401 and the side wall blank 402. Figure 9 The structure shown has a screen side on the top and a back cover side on the bottom. Figure 7 (c) and Figure 9 As shown, the antenna slot 201 does not penetrate the sidewall blank 402 in the z-axis direction, resulting in excess material on the rear shell side of the sidewall blank 402. This allows for material bonding on the rear shell side surface of the sidewall blank 402. Therefore, there is no need to provide a material bonding structure 403 on the rear shell side of the sidewall blank 402. Furthermore, based on this, there is no path for liquid ingress into the plastic-iron bond at the adhesive surface on the rear shell side of the sidewall blank 402 used for bonding the rear shell. However, on the screen side of the sidewall blank 402, since the antenna slot 201 penetrates the screen side of the sidewall blank 402 in the z-axis direction, and the screen side blanks are all folded to the rear shell side, the screen side of the mid-frame blank cannot be bonded through the screen side surface. Therefore, a material bonding structure 403 needs to be provided on the screen side of the mid-frame blank.

[0099] The connecting structure 403 is disposed on the surface of the middle frame blank facing the screen. The side wall blank 402 is arranged around the outside of the middle plate blank 401 and is spaced apart from the first region 101. The connecting structure 403 spans the first region 101 and connects the side wall blank 402 and the middle plate blank 401.

[0100] Both the antenna slot 201 and the first groove 202 are located on the sidewall blank 402. The antenna slot 201 connects the external environment and the first region 101 inside the sidewall blank 402. The first groove 202 is formed by the edge of the antenna slot 201 recessing into the sidewall blank 402. The connecting structure 403 is located on the side of the first groove 202 opposite to the antenna slot 201. For example, the connecting structure 403 may include two, and the two connecting structures 403 are located on opposite sides of the antenna slot 201.

[0101] The connecting structure 403 is located on the side of the middle frame blank facing the display screen 10. Extending from the surface facing the display screen, the connecting structure 403 connects to the middle plate blank 401. Furthermore, the connecting structure 403 is located near the antenna slot 201, which can improve the structural strength of the middle frame blank at the antenna slot 201 during subsequent injection molding. In this scenario, the connecting structure 403 is used as an injection molding connecting structure.

[0102] The connecting structure 403 is recessed inward by a first depth L1 relative to the edge of the antenna slot 201, and the recessed area of ​​the connecting structure 403 can form a first groove 202. That is, the first groove 202 is recessed inward by a first depth L1 along the y-axis towards the inside of the side wall structure 200, and the first depth L1 is at least 1mm, that is, the starting point of the connecting structure 403 is more than 1mm away from the edge of the antenna slot 201.

[0103] Step S103: Inject plastic parts into the antenna slot, the first groove, and the first region.

[0104] like Figure 7 As shown in (c), plastic material is continuously injected into the antenna slot 201, the first groove 202, and the first region 101 to form the plastic part 300.

[0105] The first region 101 can be considered as the region enclosed by the middle plate blank 401, the side wall blank 402 and the connecting structure 403. During injection molding, the injection surface is located on the lower surface of the connecting structure 403. That is to say, the connecting structure 403 protrudes from the injection surface so that the connecting structure 403 can be removed later.

[0106] Step S104: After injection molding is completed, the connecting material structure is removed by CNC machining, and the surface features of the middle plate blank and the side wall blank are processed to obtain the middle frame 30.

[0107] like Figure 7 As shown in (d), CNC machining is used to process the surface features of the middle plate blank 401 to obtain the middle plate structure 100; the surface features of the side wall blank 402 are processed to obtain the side wall structure 200; and the connecting material structure 403 is removed to obtain the middle frame 30.

[0108] Figure 10 This is a schematic diagram of the structure of the display screen and the middle frame provided in the embodiments of this application.

[0109] like Figure 10 As shown, the display screen 10 includes a glass cover (not shown in the figure), and the middle frame 30 includes an adhesive dispensing area 301, which is an adhesive dispensing platform structure. The seal between the display screen 10 and the middle frame 30 is achieved by bonding the sealant 11 around the glass cover to the adhesive dispensing area 301 of the middle frame 30. In the conventional non-antenna seam positions of the middle frame 30, since the surface of the adhesive dispensing area 301 does not require continuous material distribution, there is no iron-plastic bonding path. However, at the antenna seam 201 position, there is an iron-plastic bond, and the structural strength is weaker than in other positions. Due to the presence of continuous material, the sealant dispensing platform at this position inevitably has an iron-plastic bonding line.

[0110] See you again Figure 7In section (d), the connecting structure 403 is located at least 1 mm away from the edge of the antenna slot, ensuring that the joint between the plastic part 300 and the sidewall structure 200 in the adhesive application area 301 is far from the antenna slot 201. This extends the length of the metal-plastic bonding line at the antenna slot 201, making the metal-plastic bonding line in the entire adhesive application area 301 at least 1.5 mm. Because of the long liquid penetration path, an X8 waterproof sealing level can be achieved when liquid penetrates through the metal-plastic bonding line.

[0111] The method for manufacturing a mid-frame provided in this application involves stamping a metal sheet into a box-shaped blank using a forging process, and then machining structural features on the box-shaped blank using CNC machining to obtain a mid-frame blank. The mid-frame blank includes a mid-plate blank 401, side-wall blanks 402, and a connecting structure 403. The side-wall blank 402 includes an antenna slot 201 and a first groove 202. A first region 101 exists between the mid-plate blank 401 and the side-wall blank 402. The connecting structure 403 is located on one side of the antenna slot 201 and the first groove 202 on the side-wall blank 402, and connects the mid-plate blank 401 and the side-wall blank 402. After injection molding a plastic portion 300 into the antenna slot 201, the first groove 202, and the first region 101, the connecting structure 403 is removed using CNC machining, and surface features are machined to obtain the mid-frame 30. Using a forging process to manufacture the mid-frame 30 reduces material usage and lowers costs. Because the surface of the first groove 202 is recessed to a certain depth relative to the surface of the antenna slot 201, a portion of the plastic part 300 extends inward into the sidewall structure 200, increasing the length of the iron-plastic bonding line formed between the sidewall structure 200 and the plastic part 300 at the antenna slot 201, thereby extending the liquid inlet path. Thus, when liquid penetrates through the iron-plastic bonding line at the antenna slot 201, the longer inlet path allows for an X8 level of waterproofing. Furthermore, the plastic part 300 can form an irregular adhesive-stretched structure at the antenna slot 201, improving the bonding strength between the plastic part 300 and the sidewall structure 200. Therefore, even if the electronic device is bent, squeezed, or dropped, the plastic part 300 and the sidewall structure 200 can still maintain a tight bond, preserving the airtightness of the electronic device and thus improving its dustproof and waterproof capabilities.

[0112] Figure 11 yes Figure 2 Schematic diagram of the structure of region A2 in the middle; Figure 12 This is the third structural schematic diagram of the middle frame blank provided in the embodiments of this application.

[0113] Combination Figure 2 , Figure 11 and Figure 12As shown, in some embodiments, the difference between the middle frame 30 provided in this application embodiment and the middle frame 30 structure in region A1 is that the side wall structure 200 also includes a second groove 203. Other structural contents can be referred to the middle frame 30 structure in region A1, and will not be described in detail here.

[0114] Figure 13 This is the fourth structural schematic diagram of the middle frame blank provided in the embodiments of this application. Wherein, Figure 12 and Figure 13 The structure is shown from different perspectives.

[0115] Combination Figure 12 and Figure 13 As shown, in some embodiments, the second groove 203 is offset from the first groove 202 along the second direction (y-axis direction), the second groove 203 is located on the side of the first groove 202 away from the antenna slot 201 along the second direction, and the second groove 203 is connected to the first groove 202 and the first region 101 respectively.

[0116] For example, the first groove 202 can be considered as a recessed groove, and the first groove 202 penetrates the first surface 200a and the second surface 200b of the sidewall structure 200. The second groove 203 can be considered as a semi-circular blind hole, and the second groove 203 penetrates the second surface 200b and the third surface 402c of the sidewall structure 200. The third surface 402c faces the rear housing of the electronic device, and the second surface 402b is connected to the third surface 402c.

[0117] The plastic part 300 is continuously filled in the antenna slot 201, the first groove 202, the second groove 203 and the first region 101.

[0118] Figure 14 This is a schematic diagram of the annular adhesive-stretching structure provided in an embodiment of this application. Wherein, Figure 14 The structure of the connecting material structure 403 is not shown in the figure.

[0119] like Figure 14 As shown, in some embodiments, plastic is filled into the first groove 202, the second groove 203, the antenna slot 201, and the first region 101 to form a plastic portion 300. The plastic in these locations can form a ring-shaped adhesive structure, such as... Figure 14 The structure indicated by the arrow in the image increases the tensile strength.

[0120] Although the antenna slot 201 is a through-hole metal casing, resulting in relatively weak strength at this location, a ring-shaped adhesive strip structure can be installed at the antenna slot 201 to increase its strength. This ring-shaped adhesive strip structure can prevent minor cracking between the plastic part 300 and the side wall structure 200 due to factors such as deformation or drops of electronic devices during user operation, thereby preventing a decrease in waterproof sealing performance.

[0121] The mid-frame 30 provided in this embodiment has a sidewall structure 200 fitted onto the outer side of the mid-plate structure 100 and spaced apart by a first region 101. The sidewall structure 200 includes an antenna slot 201, a first groove 202, and a second groove 203. The first groove 202 is recessed from the edge of the antenna slot 201 toward the interior of the sidewall structure 200. The second groove 203 is located on the side of the first groove 202 opposite to the antenna slot 201 and communicates with the first groove 202. A plastic portion 300 continuously fills the interconnected antenna slot 201, the first groove 202, the second groove 203, and the first region 101 to form the mid-frame 30. Because the surface of the first groove 202 is recessed to a certain depth relative to the surface of the antenna slot 201, a portion of the plastic portion 300 extends into the interior of the sidewall structure 200. Furthermore, the communication between the first groove 202 and the second groove 203 further increases the length of the iron-plastic bonding line formed between the sidewall structure 200 and the plastic portion 300 at the antenna slot 201, thereby further extending the liquid inlet path. In this way, when liquid penetrates through the iron-plastic bonding line at the antenna slot 201, the long liquid entry path allows for a waterproof rating of X8. Furthermore, the plastic part 300 can form a ring-shaped adhesive structure at the antenna slot 201 to improve the bonding strength between the plastic part 300 and the sidewall structure 200. Thus, even if the electronic device is bent, squeezed, or dropped, the plastic part 300 and the sidewall structure 200 can still maintain a tight bond, without compromising the airtightness of the electronic device, thereby improving its dustproof and waterproof capabilities.

[0122] Figure 15 This is the second process flow diagram of the method for manufacturing the middle frame provided in the embodiments of this application.

[0123] like Figure 15 As shown, in some embodiments, the method for manufacturing the mid-frame provided in this application is used to manufacture... Figure 11 The middle frame 30 provided in the illustrated embodiment is manufactured using the following steps S201-S204:

[0124] Step S201: Provide metal sheet material.

[0125] Step S202: Perform structural processing on the metal sheet to obtain the middle frame blank.

[0126] Step S203: Inject plastic parts into the antenna slot, the first groove, the second groove, and the first region.

[0127] Step S204: After injection molding is completed, the connecting material structure is removed by CNC machining, and the surface features of the middle plate blank and the side wall blank are processed to obtain the middle frame.

[0128] It should be noted that, in combination Figure 15 The content of (a)-(d) in this application embodiment differs from the content of steps S101-S104 in the aforementioned embodiment in that the structure of the middle frame blank made in step S202 also includes the second groove 203, and the content of step S203. Other contents can be referred to the content of steps S101-S104, which will not be repeated here.

[0129] In step S202, as Figure 15 As shown in (b), structural features are machined on the box-shaped blank using CNC machining to obtain the middle frame blank. The middle frame blank may include a middle plate blank 401, a side wall blank 402, and a connecting structure 403. The side wall blank 402 includes an antenna slot 201, a first groove 202, and a second groove 203. The first groove 202 and the second groove 203 are connected and are also connected to the antenna slot 201 and the first region 101.

[0130] In step S203, as Figure 15 As shown in (c), plastic material is continuously injected into the antenna slot 201, the first groove 202, the second groove 203, and the first region 101 to form a plastic part 300.

[0131] In step S204, as Figure 15 As shown in (d), CNC machining is used to process the surface features of the middle plate blank 401 to obtain the middle plate structure 100; the surface features of the side wall blank 402 are processed to obtain the side wall structure 200, and then the connecting material structure 403 is removed to obtain the middle frame 30.

[0132] It should be noted that the remaining details of the method for manufacturing the middle frame provided in this application embodiment can be found by referring to... Figure 7 The method for manufacturing the middle frame provided in the illustrated embodiment will not be repeated here.

[0133] The method for manufacturing a mid-frame provided in this application embodiment utilizes a forging process to stamp metal sheets into box-shaped blanks, and then uses CNC machining to process structural features on the box-shaped blanks to obtain a mid-frame blank. The mid-frame blank includes a mid-plate blank 401, side-wall blanks 402, and a connecting structure 403. The side-wall blank 402 includes an antenna slot 201, a first groove 202, and a second groove 203. A first region 101 exists between the mid-plate blank 401 and the side-wall blank 402. The connecting structure 403 is located on one side of the antenna slot 201 and the first groove 202 on the side-wall blank 402, and connects the mid-plate blank 401 and the side-wall blank 402. After injection molding a plastic portion 300 into the antenna slot 201, the first groove 202, the second groove 203, and the first region 101, the connecting structure 403 is removed using CNC machining, and surface features are machined to obtain the mid-frame 30. The mid-frame 30 is machined using a forging process, requiring less material and reducing costs. Because the surface of the first groove 202 is recessed to a certain depth relative to the surface of the antenna slot 201, a portion of the plastic part 300 extends inward into the sidewall structure 200. Furthermore, the connection between the first groove 202 and the second groove 203 further increases the length of the iron-plastic bonding line formed between the sidewall structure 200 and the plastic part 300 at the antenna slot 201, thereby extending the liquid inlet path. Thus, when liquid permeates through the iron-plastic bonding line at the antenna slot 201, the long inlet path achieves an X8 level of waterproofing. Additionally, the plastic part 300 can form a ring-shaped adhesive structure at the antenna slot 201 to improve the bonding strength between the plastic part 300 and the sidewall structure 200. Therefore, even if the electronic device is bent, squeezed, or dropped, the plastic part 300 and the sidewall structure 200 can still maintain a tight bond, preserving the airtightness of the electronic device and thus improving its dustproof and waterproof capabilities.

[0134] Figure 16 yes Figure 2 A structural diagram of region A3 in the middle. Wherein, Figure 16 The pattern fill is only used to show the area of ​​the side wall structure 200.

[0135] Combination Figure 2 and Figure 16 As shown, in some embodiments, the difference between the middle frame 30 provided in this application embodiment and the middle frame 30 structure in region A1 is that the structure of the first groove 202 is different, and the side wall structure 200 also includes a boss 204. Other structural contents can be referred to the middle frame 30 structure in region A1, which will not be described in detail here.

[0136] Figure 17 This is a schematic diagram of the first partial structure of the middle frame provided in the embodiment of this application.

[0137] like Figure 17As shown, in some embodiments, the sidewall structure 200 includes suspended branches 210 and other branches 220.

[0138] Other stubs 220 include a break 221. Along the y-axis, the length of the suspended stub 210 is less than the length of the break 221. The suspended stub 210 is located within the break 221 and is spaced apart from other stubs 220, such that the suspended stub 210 and other stubs 220 form an antenna slot 201.

[0139] The suspended branch 210 has no metal connection with the middle plate structure 100. In this scenario, the first region 101 is enclosed by the suspended branch 210, other branches 220 and the middle plate structure 100.

[0140] The suspended stub 210 and the other stubs 220 each include a first groove 202 on their opposite sides to form a glue-stretching structure at the antenna slot 201. The width of the first groove 201 along the x-axis is greater than or equal to 1 mm to ensure machinability.

[0141] Figure 18 This is a second partial structural diagram of the middle frame provided in the embodiments of this application.

[0142] like Figure 18 As shown, in some embodiments, one end of the adjacent middle plate structure 100 of the suspended branch 210 and other branches 220 respectively includes a boss 204; the first groove 202 is formed by the boss 204 and the corresponding suspended branch 210 body or other branch 220 body.

[0143] In other words, in the structure of the suspended stub 210, the first groove 202 is formed by the edge of the antenna slot 201 recessed to a certain depth in the middle region of the x-axis direction and in the y-axis direction towards the interior of the suspended stub 210, so as to form a boss 204 at one end of the suspended stub 210 facing the middle plate structure 100; in the structure of the other stubs 220, the first groove 202 is formed by the edge of the antenna slot 201 recessed to a certain depth in the middle region of the x-axis direction and in the y-axis direction towards the interior of the other stubs 220, so as to form a boss 204 at one end of the other stubs 220 facing the middle plate structure 100.

[0144] The plastic portion 300 continuously fills the antenna slot 201, the first groove 201, and the first region 101, such that the plastic portion 300 surrounds the boss 204, and the surface of the boss 204 is exposed from the surface of the plastic portion 300. The boss 204 serves to conduct electricity when the middle frame 30 is colored using an anodizing process after injection molding.

[0145] See you again Figure 16As shown, the plastic part 300 includes a dispensing area 301; the dispensing area 301 is continuously formed between the boss 204 and the body of the side wall structure 200. The boss 204 is adjacent to the middle plate structure 100 and avoids the dispensing area 301. In this way, it can be ensured that the plastic part 300 is continuously formed in the dispensing area 301, and there is no iron-plastic joint line.

[0146] The mid-frame 30 provided in this embodiment has a sidewall structure 200 fitted onto the outer side of the mid-plate structure 100 and spaced apart by a first region 101. The sidewall structure 200 includes a suspended branch 210 and other branches 220. The suspended branch 210 is located within the break of the other branches 220 and forms an antenna slot 201 with the other branches 220. The opposite sides of the suspended branch 210 and the other branches 220 respectively include a boss 204 and a first groove 202. The first groove 202 is recessed from the edge of the antenna slot 201 toward the interior of the sidewall structure 200. A plastic portion 300 continuously fills the interconnected antenna slot 201, the first groove 202, and the first region 101, and the plastic portion 300 surrounds the boss 204 to form the mid-frame 30. Because the boss 204 is close to the middle plate structure 100, the glue-dispensing area 301 of the plastic part 300 is opposite to the first groove 202. The plastic part 300 is continuously formed in the glue-dispensing area 301, so there is no iron-plastic bonding line at the glue-dispensing area 301. It is difficult for liquids from the external environment to enter the inside through the antenna seam 201, achieving an X8 level of waterproofing. At the same time, it can also ensure the reliability of the seal between the display screen 10 and the middle frame 30, and improve the bonding strength between the plastic part 300 and the side wall structure 200. In this way, even if the electronic device is bent, squeezed, or dropped, the plastic part 300 and the side wall structure 200 can still be tightly bonded without compromising the airtightness of the electronic device, thereby improving the dustproof and waterproof capabilities of the electronic device.

[0147] Figure 19 This is the third process flow diagram of the method for manufacturing the middle frame provided in the embodiments of this application.

[0148] like Figure 19 As shown, in some embodiments, the method for manufacturing the mid-frame provided in this application is used to manufacture... Figure 16 The middle frame 30 provided in the illustrated embodiment is manufactured using the following steps S301-S304:

[0149] Step S301: Provide metal sheet material.

[0150] Step S302: Perform structural processing on the metal sheet to obtain the middle frame blank.

[0151] Step S303: Inject plastic parts into the antenna slot, the first groove, and the first region.

[0152] Step S304: After injection molding is completed, the connecting material structure is removed by CNC machining, and the surface features of the middle plate blank and the side wall blank are processed to obtain the middle frame.

[0153] It should be noted that, in combination Figure 19 The content of (a)-(d) in this application embodiment differs from the content of steps S101-S104 in the aforementioned embodiment in that the structure of the middle frame blank made in step S302 also includes the boss 204. Other contents can be referred to the content of steps S101-S104, which will not be repeated here.

[0154] In step S302, as Figure 19 As shown in (b), structural features are machined on the box-shaped blank using CNC machining to obtain the middle frame blank. The middle frame blank may include a middle plate blank 401, a side wall blank 402, and a connecting structure 403. The side wall blank 402 includes a suspended branch blank 4021 and other branch blanks 4022. The other branch blanks 4022 include a fracture (not shown in the figure). The suspended branch blank 4021 is located within the fracture and is spaced apart from the other branch blanks 4022, so that an antenna slot 201 is formed between the suspended branch blank 4021 and the other branch blanks 4022.

[0155] The suspended branch blank 4021 has no metal connection with the middle plate blank 401 and other branch blanks 4022. However, since electrical conductivity is required during the anodizing process to color the appearance of the middle frame 30, a connecting structure 403 is needed on the side wall blank 402 after injection molding and before anodizing for electrical conductivity. In this scenario, the connecting structure 403 is used as an anode connecting structure.

[0156] A boss 204 extends from the sidewall blank 402 toward the middle plate blank 401, forming a first groove 202 between the boss 204 and the body of the sidewall blank 402. The first groove 202 communicates with the antenna slot 201 and the first region 101. For example, a boss 204 extends from the side of the suspended branch blank 4021 toward the middle plate blank 401, forming a first groove 202 between the boss 204 and the body of the suspended branch blank 4021; other branch blanks 4022 extend bosses 204 from the side of the middle plate blank 401, forming a first groove 202 between the bosses 204 and the bodies of other branch blanks 4022. The width of the first groove 202 along the x-axis is greater than or equal to 1 mm to ensure machinability.

[0157] The number of connecting structures 403 may include two, which are arranged at intervals. One end of one connecting structure 403 is connected to the middle plate blank 401, and the other end extends to the suspended branch blank 4021 and connects to the boss 204 on the suspended branch blank 4021; one end of the other connecting structure 403 is connected to the middle plate blank 401, and the other end extends to other branch blanks 4022 and connects to the boss 204 on other branch blanks 4022. The connecting structure 403 does not cover or does not completely cover the first groove 202 located on one side of the corresponding boss 204, so as to facilitate subsequent injection molding of the plastic part 300 in the first groove 202.

[0158] For example, the thickness of the connecting structure 403 along the z-axis is greater than or equal to 0.4 mm. By using the connecting structure 403 to connect the suspended branch blank 4021, other branch blanks 4022 and the middle plate blank 401, not only can the conductive connection of the suspended branch blank 4021 and other branch blanks 4022 and the middle plate blank 401 be achieved, but the relative positions of the three can also be kept unchanged during subsequent injection molding, avoiding misalignment that would affect the injection molding effect.

[0159] In step S303, as Figure 19 As shown in (c), plastic material is continuously injected into the antenna slot 201, the first groove 202, and the first region 101 to form the plastic part 300.

[0160] The first region 101 can be considered as the region enclosed by the middle plate blank 401, the side wall blank 402, and the connecting structure 403. During injection molding, the injection surface is located on the lower surface of the connecting structure 403. That is, the connecting structure 403 protrudes from the injection surface to facilitate subsequent removal of the connecting structure 403. The plastic part 300 surrounds the boss 204, and the area of ​​the plastic part 300 adjacent to the side wall blank 402 forms a dispensing area 301. The dispensing area 301 is positioned opposite to the first groove 202, and the dispensing area 301 is used to subsequently seal the display screen 10 and the middle frame 30.

[0161] The connecting structure 403 is not connected to the body of the sidewall blank 402, but rather to the boss 204 on the sidewall blank 402. The area between the body of the sidewall blank 402 and the boss 204 is used to form the dispensing area 301. In other words, the connecting structure 403 is recessed in the x-axis direction relative to the dispensing area 301. In this way, the boss 204 faces the middle plate blank 401 and avoids the dispensing area 301, which ensures the continuity and integrity of the injection molding part 300 in the dispensing area 301.

[0162] In step S304, as Figure 19As shown in (d), CNC machining is used to perform surface feature processing on the middle plate blank 401 to obtain the middle plate structure 100; surface feature processing is also performed on the side wall blank 402 to obtain the side wall structure 200. Specifically, surface feature processing is performed on the suspended branch blank 4021 to obtain the suspended branch 210, and surface feature processing is performed on the other branch blanks 4022 to obtain other branches 220. The appearance of the side wall structure 200 is colored using anodizing. After the coloring is completed, CNC machining is used to remove the connecting structure 403, exposing the boss 204, ultimately obtaining the middle frame 30.

[0163] The method for manufacturing the middle frame provided in this application embodiment utilizes a forging process to stamp metal sheets into box-shaped blanks, and then uses CNC machining to process structural features on the box-shaped blanks to obtain the middle frame blank. The middle frame blank includes a middle plate blank 401, a side wall blank 402, and a connecting structure 403. The side wall structure 200 includes a suspended branch 210 and other branches 220. The suspended branch 210 is located within the fracture of the other branches 220 and forms an antenna slot 201 with the other branches 220. The opposite sides of the suspended branch 210 and the other branches 220 respectively include a boss 204 and a first groove 202. The first groove 202 is recessed from the edge of the antenna slot 201 toward the interior of the side wall structure 200. The connecting structure 403 is located on one side of the antenna slot 201 and the first groove 202 on the side wall blank 402 and connects the middle plate blank 401 and the boss 204 on the side wall blank 402. After the plastic part 300 is injection molded into the antenna slot 201, the first groove 202, and the first region 101, the connecting material structure 403 is removed and the surface features are machined using CNC machining to obtain the middle frame 30. The middle frame 30 is machined using a stamping and forging process, which uses less material and can reduce costs. Since the boss 204 is close to the middle plate structure 100, the glue dispensing area 301 of the plastic part 300 is opposite to the first groove 202. The plastic part 300 is continuously formed in the glue dispensing area 301, so there is no iron-plastic bonding line at the glue dispensing area 301. The glue dispensing area 301 isolates the antenna slot 201 from the interior, making it difficult for liquids from the external environment to enter the interior through the antenna slot 201, achieving an X8 level of waterproofing. At the same time, it can also ensure the reliability of the seal between the display screen 10 and the middle frame 30, and improve the bonding strength between the plastic part 300 and the side wall structure 200. In this way, even if the electronic device is bent, squeezed or dropped, the plastic part 300 and the side wall structure 200 can still be tightly bonded without compromising the airtightness of the electronic device, thereby improving the dustproof and waterproof capabilities of the electronic device.

[0164] This application also provides an electronic device, including a display screen 10, a back cover, and a mid-frame 30 provided in any of the foregoing embodiments; the display screen 10 and the back cover are located on opposite sides of the mid-frame 30 and are connected to the mid-frame 30.

[0165] The electronic device provided in this application embodiment includes a middle frame 30, which can improve the bonding strength between the side wall structure 200 and the plastic part 300 to meet waterproof sealing requirements and has low manufacturing cost.

[0166] It should be noted that those skilled in the art, upon considering the specification and practicing the application disclosed herein, will readily conceive of other embodiments of this application. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope of this application is indicated by the following claims.

[0167] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A middle frame, characterized in that, include: Middle plate structure (100); A sidewall structure (200) is fitted on the outside of the middle plate structure (100) and spaced apart by a first region (101). The sidewall structure (200) includes an antenna slot (201) and a first groove (202) recessed from the edge of the antenna slot (201) toward the interior of the sidewall structure (200). The antenna slot (201), the first groove (202) and the first region (101) are connected. The plastic part (300) is filled in the antenna slot (201), the first groove (202) and the first region (101).

2. The middle frame according to claim 1, characterized in that, The number of the first grooves (202) is multiple; The plurality of the first grooves (202) are spaced apart along a first direction at the edge of the antenna slot (201); The first direction is the thickness direction of the middle frame.

3. The middle frame according to claim 2, characterized in that, At least one of the first grooves (202) penetrates the first surface and the second surface of the sidewall structure (200), and the first groove (202) is recessed into the sidewall structure (200) to a first depth along a second direction; The second direction is the length direction of the middle frame, the first surface faces the display screen of the electronic device, the second surface faces the middle plate structure (100), and the first surface and the second surface are connected.

4. The middle frame according to claim 2, characterized in that, At least one of the first grooves (202) penetrates the second surface of the sidewall structure (200); The first groove (202) is recessed into the sidewall structure (200) to a second depth along the second direction; The second direction is the length direction of the middle frame, and the second surface faces the middle plate structure (100).

5. The middle frame according to claim 1, characterized in that, The sidewall structure (200) further includes: a second groove (203); The second groove (203) is located on the side of the first groove (202) away from the antenna slot (201) along the second direction, and the second groove (203) is connected to the first groove (202) and the first region (101) respectively; the second direction is the length direction of the middle frame; The plastic part (300) fills the antenna slot (201), the first groove (202), the second groove (203) and the first region (101).

6. The middle frame according to claim 5, characterized in that, The first groove (202) penetrates the first and second surfaces of the sidewall structure (200); The second groove (203) penetrates the second and third surfaces of the sidewall structure (200); The first surface faces the display screen of the electronic device, the second surface faces the middle plate structure (100), and the third surface faces the rear shell of the electronic device. The first surface is connected to the second surface, and the second surface is connected to the third surface.

7. The middle frame according to claim 1, characterized in that, The sidewall structure (200) includes suspended branches (210) and other branches (220); The other stubs (220) include a break, and the suspended stub (210) is located at the break to form the antenna slot (201) with the other stubs (220); The first groove (202) is included on the opposite side of the suspended branch (210) and the other branches (220).

8. The middle frame according to claim 7, characterized in that, The suspended branch (210) and the other branches (220) each have a boss (204) at one end adjacent to the middle plate structure (100); The first groove (202) is formed by the boss (204) and the corresponding suspended branch (210) body or the other branch (220) body; The plastic part (300) surrounds the boss (204), and the boss (204) is exposed from the surface of the plastic part (300).

9. The middle frame according to claim 8, characterized in that, The plastic part (300) includes a dispensing area (301); The dispensing area (301) is continuously formed between the boss (204) and the body of the side wall structure (200).

10. The middle frame according to claim 3 or 4, characterized in that, The two opposing surfaces of the antenna slot (201) each include the first groove (202); The width of the area enclosed by the two opposing first grooves (202) is greater than the width of the antenna slot (201).

11. A method for manufacturing a middle frame, characterized in that, The method for fabricating a middle frame as described in any one of claims 1-10 includes: Provide metal sheet materials; The metal sheet is structurally processed to obtain a middle frame blank; the middle frame blank includes a middle plate blank, side wall blanks, and a connecting structure; the side wall blanks are arranged around the outside of the middle plate blank and are spaced apart by a first region; the side wall blanks include an antenna slot and a first groove recessed from the edge of the antenna slot toward the interior of the side wall blank; the connecting structure is located on the side of the first groove opposite to the antenna slot and connects the side wall blank and the middle plate blank. The antenna slot, the first groove, and the first region injection-molded plastic portion; After injection molding is completed, the connecting material structure is removed by CNC machining, and the surface features of the middle plate blank and the side wall blank are processed to obtain the middle frame.

12. The method according to claim 11, characterized in that, The sidewall blank also includes a second groove, which is offset from the first groove along a second direction, and the second groove is connected to the first groove and the first region respectively; the second direction is the length direction of the middle frame; as well as, The antenna slot, the first groove, and the first region injection-molded plastic portion include: The antenna slot, the first groove, the second groove, and the first region are injection-molded plastic portions.

13. The method according to claim 11, characterized in that, The sidewall blank includes a suspended branch blank and other branch blanks; the other branch blanks include a break, and the suspended branch blank is located at the break to form the antenna slot with the other branch blanks; the opposite sides of the suspended branch blank and the other branch blanks each include the first groove, and a boss located on one side of the first groove; as well as, The first groove, the first region, and the first region injection-molded plastic portion include: In the antenna slot, the first groove, and the first region, a plastic injection-molded portion surrounds the boss.

14. The method according to claim 13, characterized in that, The connecting structure is a boss that connects the middle plate blank and the side wall blank; as well as, The step of removing the continuous material structure using CNC machining after injection molding includes: After injection molding is completed, the connecting material structure is removed by CNC machining to expose the boss.

15. An electronic device, characterized in that, Includes a display screen, a rear cover, and a mid-frame as described in any one of claims 1-10; The display screen and the rear shell are located on opposite sides of the middle frame and are connected to the middle frame.

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