Middle frame of electronic equipment and electronic equipment

Abstract

The invention discloses a middle frame of electronic equipment and the electronic equipment, and belongs to the technical field of electronic equipment. The middle frame of the electronic equipment comprises a metal framework and a plastic frame, the metal framework is provided with a first side and a second side which are deviated from each other in the thickness direction of the metal framework, a shaft area and a middle plate area are sequentially arranged on the first side in the width direction of the metal framework, and a drainage groove is formed in the edge of the first side; the plastic frame wraps the outer side of the side, away from the middle plate area, of the shaft area and fills the drainage groove. Due to the fact that the drainage groove is formed in the metal framework, in the injection molding process, injection molding materials can flow to the edge of the first side through the drainage groove and flow to the second side through the edge of the first side, due to the arrangement of the drainage groove, the injection molding pressure loss is smaller, in other words, the injection molding materials flow more evenly, and the surface smoothness of the formed plastic frame is higher; therefore, appearance defects such as shadows or sawteeth of the plastic frame are reduced.

Description

[0001] This application is based on a divisional application with application number 202311024574.8, application date August 14, 2023, and invention name “Middle frame of electronic device and electronic device”. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the technical field of electronic equipment, and in particular to a middle frame of an electronic equipment and the electronic equipment. Background Art

[0003] At present, some electronic devices use a metal frame, and a plastic surface layer is set on the outside of the metal frame. The plastic surface layer is formed on the periphery of the metal frame by injection molding. However, due to the poor surface flatness of the plastic surface layer, poor appearance problems such as interlaced light and shadow and jaggedness will occur. Summary of the invention

[0004] The present application provides a middle frame of an electronic device and the electronic device. The middle frame of the electronic device can reduce the injection pressure loss of the injection molded parts, improve the appearance smoothness of the injection molded parts, and reduce the problem of poor appearance.

[0005] The technical solution is as follows:

[0006] In a first aspect, the present application provides a middle frame of an electronic device, comprising:

[0007] The metal frame has a first side and a second side that are separated from each other in the thickness direction of the metal frame, and a drainage groove is provided at the edge of the first side, and the drainage groove is used for allowing the injection material to move from the first side to the second side;

[0008] The plastic frame is integrally injection-molded with the outer peripheral edge of the metal frame.

[0009] In the middle frame of the electronic device provided in the present application, since the metal frame is provided with a drainage groove, during the injection molding process, the injection material can flow to the edge of the first side through the drainage groove, and flow to the second side through the edge of the first side. The setting of the drainage groove makes the injection molding pressure loss smaller, that is, the injection molding material flows more evenly, and the surface smoothness of the formed plastic frame is higher, thereby reducing the poor appearance of the plastic frame such as shadows or jagged edges.

[0010] In some implementations, the edge of the first side includes a first edge, and in the width direction of the metal frame, the first side is sequentially provided with an axis area and a middle plate area, and the first edge is a side edge of the axis area away from the middle plate area.

[0011] In some implementations, the drainage groove is disposed at the first edge, and the bottom wall of the drainage groove includes a first drainage wall;

[0012] From an end away from the first edge to a direction close to the first edge, the first guide wall is inclined toward a direction close to the second side.

[0013] In some implementations, the bottom wall of the drainage groove includes a second drainage wall, the second drainage wall is connected to a side of the first drainage wall away from the first edge, and the second drainage wall is perpendicular to the thickness direction of the metal frame.

[0014] In some implementations, the drainage groove includes a drainage side wall, and a side of the drainage side wall away from the first edge has a curved wall surface.

[0015] In some implementations, there are multiple drainage grooves, and the multiple drainage grooves are arranged at intervals along the first edge.

[0016] In some implementations, the thickness of the metal skeleton where the drainage groove is provided is greater than or equal to 0.35 mm.

[0017] In some implementations, the metal frame is provided with glue holes, which penetrate the metal frame along the thickness direction of the metal frame, the plastic frame is covered on both sides of the glue hole, and a limiting portion is formed on the plastic frame corresponding to the glue hole.

[0018] In some implementations, the glue pulling hole is arranged in the shaft area.

[0019] In some implementations, the glue hole is disposed adjacent to the first edge, and the glue hole is spaced apart from the first edge.

[0020] In some implementations, there are multiple glue holes, and the multiple glue holes are spaced apart in the axial region along the length direction of the metal skeleton.

[0021] In some implementations, the size of the glue hole in the length direction of the metal frame is L1; the size of the glue hole in the width direction of the metal frame is L2, and L1>L2.

[0022] In some implementations, the glue hole is formed by connecting a plurality of glue walls, and adjacent glue walls are connected by an arc transition.

[0023] In some implementations, the metal skeleton includes a middle frame reinforcement portion, the middle frame reinforcement portion is located on a side of the glue hole facing the first edge, and the middle frame reinforcement portion protrudes from the first edge.

[0024] In some implementations, the side of the middle frame reinforcement portion away from the first edge has a first slope, a second slope and a first plane, the first plane is parallel to the first edge, the first slope and the second slope are respectively located on both sides of the first plane, and the first slope and the second slope are respectively set at obtuse angles with the first plane.

[0025] In some implementations, the glue hole is formed by connecting multiple glue walls. In the width direction of the metal frame, the glue wall includes a first glue wall and a second glue wall that are spaced apart. The first glue wall is located between the second glue wall and the first edge. In the length direction of the metal frame, the size of the first glue wall is smaller than the size of the second glue wall.

[0026] In some implementations, there is a height difference between the shaft area and the middle plate area, there is a side elevation between the shaft area and the middle plate area, the side elevation is provided with a glue groove, and a glue reinforcement portion is formed on the plastic frame corresponding to the glue groove.

[0027] In some implementations, the glue pulling groove includes a dovetail groove.

[0028] In some implementations, the metal skeleton is a magnesium alloy skeleton.

[0029] A second aspect of the present application provides an electronic device, including a middle frame of the electronic device provided by any of the above technical solutions.

[0030] Through the above technical solution, since the electronic device includes the middle frame of the above electronic device, it at least has all the beneficial effects of the middle frame of the electronic device, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the exploded parts of the electronic device provided in the embodiment of the present application;

[0032] Figure 2 is a structural schematic diagram of a middle frame provided in an embodiment of the present application at a viewing angle;

[0033] Figure 3 is a schematic diagram of exploded parts of a middle frame at a viewing angle provided by an embodiment of the present application;

[0034] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0035] Figure 5 is a structural schematic diagram of the middle frame provided in an embodiment of the present application at another viewing angle;

[0036] Figure 6 yes Figure 5 Sectional view at EE;

[0037] Figure 7 yes Figure 5 Cross-sectional view at FF;

[0038] Figure 8 is a schematic diagram of exploded parts of a middle frame provided in an embodiment of the present application from another perspective;

[0039] Fig. 9This is a schematic diagram of the structure of the metal skeleton in the middle frame provided in an embodiment of the present application;

[0040] Fig.10 yes Fig. 9 A partial enlarged view of the G in the middle;

[0041] Fig.11 yes Figure 8 A partial enlarged view of point C in the middle;

[0042] Fig.12 yes Figure 3 A partial enlarged view of point B in the middle;

[0043] Fig.13 yes Figure 8 A partial enlarged view of point D in the middle.

[0044] The meanings of the figures are as follows:

[0045] 1. Electronic equipment;

[0046] 10. middle frame; 20. first display screen; 30. second display screen; 40. cover body;

[0047] 101, stop surface;

[0048] 110, metal frame; 1101, first side; 1102, second side; 111, drainage groove; 1112, first drainage wall; 1111, second drainage wall; 1113, drainage side wall; 112, glue hole; 1121, first glue wall; 1122, second glue wall; 113, glue groove; 114, middle frame reinforcement; 1141, first inclined surface; 1142, second inclined surface; 1143, first plane; 115, shaft area; 116, middle plate area; 117, first edge; 118, side elevation;

[0049] 120. Plastic frame; 121. Limiting portion; 122. Glue reinforcement portion. DETAILED DESCRIPTION

[0050] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0051] It should be understood that the "multiple" mentioned in this application refers to two or more. In the description of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in order to facilitate the clear description of the technical solution of this application, the words "first" and "second" are used to distinguish between the same items or similar items with basically the same functions and effects. Those skilled in the art can understand that the words "first" and "second" do not limit the quantity and execution order, and the words "first" and "second" do not limit them to be different.

[0052] In the related art, when a metal frame and a plastic are injection molded into an integrated structure, the metal frame is usually placed in a mold, the mold has a receiving cavity, the metal frame is located in the receiving cavity, and a molding cavity is formed between the metal frame and the receiving cavity. The mold includes a gate, the gate is connected to the molding cavity, and the injection material is injected from the gate, and the injection material enters the molding cavity to form a plastic frame. The distance of the injection material flowing in the molding cavity and the filling uniformity are both related to the injection pressure. The greater the injection pressure, the tighter the injection material filling and the higher the filling uniformity. The injection pressure is related to the pressure that the injection molding equipment can provide, and the shortest distance between the gate and the metal skeleton. Since the pressure that the injection molding equipment can provide is limited, and under the size limit of the mold, the distance between the gate and the metal skeleton is limited, the current injection pressure is insufficient, the flow distance of the injection molding material from the gate into the molding cavity is relatively short, the filling density of the injection molding material in the molding cavity is relatively low, and the filling uniformity of the injection molding material is low, which makes the injection molding material incompletely contact with the wall of the molding cavity, that is, the outer surface smoothness of the plastic frame formed by the injection molding material is low, that is, there is a pitted appearance effect. The plastic frame with a pitted surface will present irregular shadows and jagged appearances under light irradiation due to the large difference in the reflection and refraction angles of light between the pits and the smooth parts, and the aesthetics is poor; on the other hand, the plastic frame with a pitted surface has a poor feel, which affects the user's experience; on the other hand, the plastic frame with a pitted surface is easy to wear and chip off during use, which further affects the aesthetics of the appearance, and the use experience is poor, and affects the structural strength of the plastic frame.

[0053] In order to solve the above technical problems, this embodiment provides a middle frame of an electronic device and the electronic device.

[0054] The middle frame of the electronic device and the electronic device provided in the embodiments of the present application are explained in detail below.

[0055] In the drawings of the present application, the leads with hollow arrows all point to the surface of the device, the leads with solid arrows all point to the device itself, and the leads with dots all point to the edge of the device.

[0056] The middle frame of the electronic device provided in the embodiment of the present application (hereinafter referred to as the middle frame) is applied to the electronic device, wherein the electronic device can be a mobile phone, a tablet computer, a tablet computer accessory, a wearable device, a vehicle-mounted device, an augmented reality (AR) / virtual reality (VR) device, a laptop computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA) and other mobile terminals or, it can also be a digital camera, a SLR camera / micro-single camera, a sports camera, a pan-tilt camera, a drone and other professional shooting equipment. The embodiment of the present application does not impose any special restrictions on the specific form of the electronic device, and the electronic devices in the embodiment of the present application all have a middle frame. For ease of understanding, the following description takes the electronic device as a mobile phone as an example.

[0057] The electronic device provided in the embodiment of the present application includes a display screen and a housing. The housing provides a mounting base for the components of the electronic device on the one hand, and provides a protective function for some components on the other hand. A receiving cavity may be formed inside the housing, and various components of the electronic device may be arranged inside the receiving cavity. Exemplarily, the housing may include a middle frame and a cover body. In a non-folding electronic device, the display screen and the cover body are respectively located on both sides of the middle frame along its thickness direction.

[0058] In foldable electronic devices, such as Figure 1 As shown, the display screen includes a first display screen 20 and a second display screen 30, the number of the middle frames 10 is two, and the foldable electronic device 1 also includes a hinge mechanism. The two middle frames 10 are rotatably connected by the hinge mechanism, and the side of the two middle frames 10 close to the other middle frame 10 is provided with an axis area 115, and the axis area 115 is used to provide an installation and accommodation space for the connection of the hinge mechanism. On one side of the two middle frames 10, the first display screen 20 is laid on the two middle frames 10, and on the other side opposite to the two middle frames 10, the second display screen 30 is laid on one of the middle frames 10, and the cover body 40 is installed on the other middle frame 10. The foldable electronic device 1 can be an inward folding type or an outward folding type.

[0059] The side of the middle frame 10 facing the cover 40 is usually provided with a cavity to form a battery compartment, and the cover 40 can seal the battery compartment. The cover 40 can be made of one or more materials such as metal, plastic, ceramic, and glass.

[0060] At least part of the display screen can be supported on the middle frame 10 and connected to the middle frame 10. In the foldable electronic device 1, the first display screen 20 is a flexible display screen, which can be matched with the structural design of the shell to achieve folding and other operations, and the second display screen 30 can be a flexible display screen or a hard display screen. The display screen can be an ordinary regular screen or a special-shaped screen. For example, the outer edge of the display screen can be set to an arc to form a curved screen.

[0061] like Figure 2 , Figure 3 and Figure 4 As shown, the embodiment of the present application provides a middle frame 10 of an electronic device 1, and the middle frame 10 includes: a metal frame 110 and a plastic frame 120, and the plastic frame 120 is integrally injection molded with the peripheral edge of the metal frame 110. In the thickness direction of the metal frame 110, the metal frame 110 has a first side 1101 and a second side 1102 that are separated from each other, and the edge of the first side 1101 is provided with a drainage groove 111, and the drainage groove 111 is used to allow the injection material to move from the first side 1101 to the second side 1102.

[0062] The middle frame 10 is applied to the electronic device 1. In the description of this embodiment, the thickness direction of the middle frame 10 and the metal frame 110 and the plastic frame 120 included therein are the same as the thickness direction of the electronic device 1, the length direction of the middle frame 10 and the metal frame 110 and the plastic frame 120 included therein are the same as the length direction of the electronic device 1, and the width direction of the middle frame 10 and the metal frame 110 and the plastic frame 120 included therein are the same as the width direction of the electronic device 1. In the electronic device 1, the display screen is arranged on at least one side of the thickness direction of the electronic device 1. In the non-folding electronic device 1, the length direction of the electronic device 1 is greater than the width direction. In the folding electronic device 1, the length direction of the electronic device 1 is not necessarily greater than the width direction. When the folding electronic device 1 is in a folded state, its width dimension is relatively small, and when the folding electronic device 1 is in an unfolded state, its width dimension is relatively large. During the folding process of the folding electronic device 1, its width dimension changes, while its length dimension remains unchanged. In the accompanying drawings, the thickness direction is shown in the Z direction, the length direction is shown in the Y direction, and the width direction is shown in the X direction. The X direction, the Y direction, and the Z direction are perpendicular to each other. The X direction, the Y direction, and the Z direction do not point to a single direction or a single position. The direction parallel to the X direction is called the X direction, the direction parallel to the Y direction is called the Y direction, and the direction parallel to the Z direction is called the Z direction.

[0063] The plastic frame 120 is coated on the outer peripheral edge of the metal frame 110, and the plastic frame 120 and the metal frame 110 are integrally injection molded. Specifically, the outer peripheral edge of the metal frame 110 is a partial area of ​​the metal frame 110 in a direction perpendicular to the thickness direction of the metal frame 110, close to the outer edge of the metal frame 110. The plane perpendicular to the thickness direction of the metal frame 110 is set as the reference plane. Exemplarily, when the outer contour shape of the projection of the metal frame 110 on the reference plane is a rectangle or a quasi-rectangular shape (such as a generally rectangular shape such as a rounded rectangle), the metal frame 110 includes two opposite long sides and two short sides, then the partial area adjacent to the long side, and the partial area adjacent to the short side are surrounded to form an annular area, which is the outer peripheral edge of the metal frame 110. It is worth noting that in different areas of the outer peripheral edge, the distance between the inner side of the outer peripheral edge area and the adjacent long side (or short side) is different, that is, the outer peripheral edge is not an equal width annular area, but an irregular annular area.

[0064] The plastic frame 120 may be continuously arranged along the outer edge of the metal frame 110, or the outer edge of the metal frame 110 may be completely provided with the plastic frame 120. In this way, the plastic frame 120 covers the metal frame 110 to a high degree, the appearance of the middle frame 10 is highly consistent, and the corrosion resistance of the middle frame 10 is stronger. Alternatively, the outer edge of the metal frame 110 is partially covered with the plastic frame 120, that is, the frame of the metal frame 110 and the plastic frame 120 are alternately arranged along the outer edge of the metal frame 110, so that the edge portion of the middle frame 10 can have a higher structural strength.

[0065] In this embodiment, the metal skeleton 110 may be die-cast or stamped, and the metal skeleton 110 is made of metal, such as aluminum alloy, stainless steel, titanium alloy, magnesium alloy, etc.

[0066] In some implementations, the metal frame 110 is an aluminum alloy frame or a magnesium alloy frame. This metal frame 110 is relatively lighter in weight while ensuring structural strength, so that the weight of the electronic device 1 using the middle frame 10 is relatively lighter.

[0067] The plastic frame 120 is formed by injection molding at the outer peripheral edge of the metal skeleton 110 , and the combination of metal material and plastic material can take into account both the use strength and lightweight design requirements of the middle frame 10 .

[0068] There are many optional injection molding materials for the plastic frame 120. In practical applications, technicians in this field can choose according to their needs. For example, the plastic frame 120 can be PPA (Polyphthalamide in English). PA (Polyamide in English), PBT (polybutylene terephthalate in English), PPS (Polyphenylene sulfide in English), PEEK (poly(ether-ether-ketone) in English), PC (Polycarbonate in English) and other materials. One or more. It should be clear that when the plastic frame 120 is a combination of multiple materials, for example, a combination of PPA and PA, the ratio between PPA and PA is not limited, and no matter what ratio is used between the two, the plastic frame 120 is a mixture of two existing materials, PPA and PA, and should not be understood as a new material.

[0069] In some embodiments, Figure 2 and Figure 3 As shown, the outer edge of the metal frame 110 is completely covered with a plastic frame 120 .

[0070] After the metal skeleton 110 is manufactured, the metal skeleton 110 is placed in a mold. The mold has a receiving cavity. The metal skeleton 110 is located in the receiving cavity, and a molding cavity is formed between the metal skeleton 110 and the receiving cavity. The mold includes a gate, which is connected to the molding cavity. The injection molding material is injected from the gate, and the injection molding material enters the molding cavity to form a plastic frame 120.

[0071] like Figure 3 , Figure 5 and Figure 6As shown, in the thickness direction of the metal skeleton 110, the metal skeleton 110 has a first side 1101 and a second side 1102, the first side 1101 and the second side 1102 are spaced apart, and the first side 1101 is the metal skeleton 110. During the injection molding process, the first side 1101 is arranged opposite to the gate, and the first side 1101 is closer to the gate than the second side 1102. That is, the injection material entering the gate first contacts the first side 1101, and then flows to the second side 1102. The number of gates can be one or more, and a drainage groove 111 is arranged on the first side 1101 of the metal skeleton 110. The drainage groove 111 is arranged opposite to at least one gate, so that during the injection molding process, the injection material entering the gate opposite to the drainage groove 111 first enters the drainage groove 111, and then flows to the second side 1102 through the drainage groove 111. After the injection material fills the entire molding cavity opposite to the second side 1102, the injection material gradually overflows the drainage groove 111 and flows on the first side 1101 of the metal skeleton 110 to gradually fill the molding cavity on the first side 1101 of the metal skeleton 110 to form a plastic frame 120 that wraps the outer peripheral edge of the metal skeleton 110.

[0072] Compared with the middle frame 10 in the related art, under the same mold and the same injection molding equipment, and when the injection molding equipment provides the same injection molding pressure, during the injection molding process, since the first side 1101 of the metal skeleton 110 in the middle frame 10 provided in this embodiment is provided with a drainage groove 111, the drainage groove 111 is recessed toward the second side 1102 relative to other areas of the first side 1101 of the metal skeleton 110, so that the distance between the bottom wall of the drainage groove 111 and the gate is relatively farther, thereby increasing the injection molding pressure at the gate position, that is, reducing the injection molding pressure loss at the gate position. , so that under the same injection pressure, the injection material can flow to a farther position through the drainage groove 111, thereby increasing the filling density of the injection material in the molding cavity and the filling uniformity of the injection material, thereby increasing the pressure in the molding cavity, that is, increasing the pressure between the injection material and the wall of the molding cavity, and increasing the contact area, which makes the plastic frame 120 formed by the injection material have a higher smoothness, that is, reducing the probability of the presence of potholes on the surface, thereby reducing or even eliminating the probability of the plastic frame 120 presenting irregular shadows and jagged appearances, and improving the aesthetics of the plastic frame 120. By using the middle frame 10 provided in this embodiment, the defect rate of appearance problems such as shadows and jaggedness in the plastic frame 120 can be greatly reduced from 90%, and can even be reduced to 0%.

[0073] In summary, in the middle frame 10 of the electronic device 1 provided in the embodiment of the present application, since the metal skeleton 110 is provided with a drainage groove 111, during the injection molding process, the injection material can flow to the edge of the first side 1101 through the drainage groove 111, and flow to the second side 1102 through the edge of the first side 1101. The setting of the drainage groove 111 makes the injection molding pressure loss smaller, that is, the injection molding material flows more evenly, and the surface smoothness of the formed plastic frame 120 is higher, thereby reducing the poor appearance of the plastic frame 120 such as shadows or jagged edges.

[0074] In some implementations, the edge of the first side 1101 may be any part or all of the peripheral edge of the metal frame, that is, the drainage grooves 111 may be arranged at intervals around the peripheral edge of the metal frame, or the drainage grooves 111 may be arranged in any one or several directions of the peripheral edge of the metal frame.

[0075] like Figure 3 As shown, in the case where the middle frame 10 is suitable for a foldable electronic device 1, in the width direction of the metal frame 110, the first side 1101 is sequentially provided with an axis area 115 and a middle plate area 116, the axis area 115 is used to install the hinge mechanism of the electronic device 1, and the middle plate area 116 is used to install other components of the electronic device 1, such as a main board, a battery and other structures. In some implementations, the edge of the first side 1101 includes a first edge 117, and the first edge 117 is a side edge of the axis area 115 away from the middle plate area 116. That is to say, the drainage groove 111 is arranged in the axis area 115. Under this arrangement, since the axis area 115 is closer to the gate, the injection pressure loss at the axis area 115 is smaller, the filling degree is higher, the plastic frame 120 is better for the coating type of the axis area 115, and the surface smoothness of the plastic frame 120 located outside the axis area 115 is higher, and the appearance defect rate is lower.

[0076] In some embodiments, the shaft area 115 is completely located within the peripheral edge range of the metal frame 110 , that is, the shaft area 115 is completely covered by the plastic frame 120 . The plastic frame 120 covers the entire shaft area 115 , which can improve the corrosion resistance of the shaft area 115 .

[0077] When the middle frame 10 is suitable for a foldable electronic device 1, in the metal frame 110, the outer side of the axis area 115 away from the middle plate area 116 is wrapped by the plastic frame 120, and the plastic frame 120 has a stop surface 101 on the side away from the middle plate area 116. When the foldable electronic device 1 is in a fully unfolded state, the stop surfaces 101 of the two middle frames 10 are in contact. Since both middle frames 10 have stop surfaces 101, the setting of the stop surfaces 101 limits the maximum unfolding angle of the foldable electronic device 1. Since the drainage groove 111 is provided in the axis area 115 of the foldable electronic device 1, and the axis area 115 is close to the stop surface 101, the setting of the drainage groove 111 makes the stop surface 101 more flat and has a better appearance.

[0078] like Figure 4 As shown, in some implementations, the drainage groove 111 is disposed at the first edge 117, and the bottom wall of the drainage groove 111 includes a first drainage wall 1112; from the end away from the first edge 117 to the direction close to the first edge 117, the first drainage wall 1112 is inclined in the direction close to the second side 1102. For example, if the thickness direction of the middle frame 10 is the height direction, the first side 1101 is the upper side, and the second side 1102 is the lower side, and the first edge 117 is located on the left side, then the first drainage wall 1112 is inclined from right to left and from top to bottom, and the height of the left side of the first drainage wall 1112 is lower than the height of the right side. If the part of the second side 1102 opposite to the first drainage wall 1112 is a plane, the distance between the left end of the first drainage wall 1112 and the second side 1102 is less than the distance between the right end of the first drainage wall 1112 and the second side 1102. The first guide wall 1112 forms a slope between the first side 1101 and the second side 1102. The slope can be a plane or a curved surface. Due to the first guide wall 1112, the injection material can flow faster from the first side 1101 to the second side 1102 to improve the injection efficiency.

[0079] like Figure 4As shown, in some implementations, the bottom wall of the drainage groove 111 includes a second drainage wall 1111, the second drainage wall 1111 is connected to the side of the first drainage wall 1112 away from the first edge 117, and the second drainage wall 1111 is perpendicular to the thickness direction of the metal frame 110. When the metal frame 110 is placed horizontally, the second drainage wall 1111 is parallel to the horizontal plane. The second drainage wall 1111 is arranged opposite to the gate, and the injection molding material entering through the gate flows to the first drainage wall 1112 through the second drainage wall 1111, and flows to the side of the metal frame 110 and the second side 1102 through the first drainage wall 1112. Since the second guide wall 1111 is perpendicular to the thickness direction of the metal frame 110, when the metal frame 110 is placed horizontally in the mold, in the height direction, the distance between each area of ​​the second guide wall 1111 and the gate is consistent, that is, the injection pressure of the injection material entering the second guide wall 1111 through the gate is similar or equal in the area where the second guide wall 1111 is located, which facilitates the uniform flow of the injection material along the second guide wall 1111.

[0080] like Figure 4 As shown, in some implementations, the drainage groove 111 includes a drainage side wall 1113, and the drainage side wall 1113 has an arc-shaped wall surface on one side away from the first edge 117. The drainage side wall 1113 is a side wall extending in the thickness direction of the metal skeleton 110 in the drainage groove 111, and the drainage side wall 1113 and the second drainage wall 1111 can be vertical or relatively inclined. Exemplarily, the drainage side wall 1113 extends along the thickness direction of the metal skeleton 110, and the drainage side wall 1113 and the second drainage wall 1111 are relatively vertically arranged. The drainage side wall 1113, the first drainage wall 1112 and the second drainage wall 1111 are surrounded to form the drainage groove 111. The higher the height of the drainage side wall 1113, the greater the depth of the drainage groove 111. The drainage groove 111 forms an opening at the wall of the first side 1101 to facilitate the injection molding material to flow to the second side 1102. The drainage side wall 1113 has an arc-shaped wall surface on the side opposite to the opening, which can reduce the angular area in the drainage side wall 1113, and to a certain extent reduce or even avoid the injection material having a stress concentration area in the drainage groove 111, so that the injection material can more evenly fill the drainage groove 111. Exemplarily, the drainage side wall 1113 is a U-shaped wall surface, and the side facing the first edge 117 has an opening, and the side opposite to the opening is an arc-shaped wall surface.

[0081] In the mold, there are one or more gates, and the number and location of the gates are related to the size and specific structure of the metal frame 110, and to the injection pressure range that the injection molding equipment can provide. For example, if the injection molding pressure that the injection molding equipment can provide is small, more gates need to be set; when the size of the metal frame 110 is larger, more gates need to be set.

[0082] When there are multiple gates, one or more drainage grooves 111 may be provided on the metal skeleton 110, and the number of drainage grooves 111 is less than or equal to the number of gates. In some implementations, there are multiple drainage grooves 111, and multiple drainage grooves 111 are arranged at intervals along the first edge 117. In this arrangement, at least part or all of the multiple gates arranged opposite to the first edge 117 of the metal skeleton 110 are arranged corresponding to the drainage grooves 111. Exemplarily, if the number of gates arranged opposite to the first edge 117 of the metal skeleton 110 is n, n is an integer greater than 1, and the number of drainage grooves 111 arranged on the metal skeleton 110 is m, m is an integer, 1<m≤n, when m is less than n, each drainage groove 111 is arranged opposite to a different gate, that is, at least m gates are arranged corresponding to drainage grooves 111. In another example, m=n, each gate corresponds to a drainage groove 111, and the gates correspond to the drainage grooves 111 one by one. Since each gate has a corresponding drainage groove 111 , the injection pressure loss of the injection material entering each gate is reduced, so that the appearance flatness of different areas of the plastic frame 120 is higher.

[0083] like Figure 6 As shown, in some implementations, the thickness H of the metal skeleton 110 where the drainage groove 111 is provided is greater than or equal to 0.35 mm. In other words, in the thickness direction of the metal skeleton 110, the size of the metal skeleton 110 where the drainage groove 111 is provided is greater than or equal to 0.35 mm, and the size of the metal skeleton 110 where the drainage groove 111 is provided is smaller than the size of the metal skeleton 110 where the drainage groove 111 is not provided. In other words, in the metal skeleton 110, the thickness of the thinnest part is not less than 0.35 mm. Within this thickness range, the structural strength of the metal skeleton 110 is stronger.

[0084] In the related art, a middle frame with a metal frame and a plastic frame integrated is usually set in a non-folding electronic device, and a dovetail groove is set on the metal frame. After the plastic frame is formed by injection molding, a rubber pull structure is formed at the position of the dovetail groove on the plastic frame. The plastic frame and the metal frame are relatively fixed by the relative limitation of the rubber pull structure and the dovetail groove. However, in order to set the dovetail groove and form a relative limitation of a certain strength between the dovetail groove and the rubber pull structure, the dovetail groove needs to reach a certain depth, that is, the metal frame needs to be relatively thick where the dovetail groove is set. If the metal frame is thin, the limitation of the dovetail groove and the plastic frame cannot effectively prevent the metal frame from separating from the plastic frame. In a folding electronic device, a rotating shaft needs to be installed on one side of the middle frame, so the thickness of the shaft area is thin, and it is difficult to fix the plastic frame and the metal frame by setting the dovetail groove. Therefore, the middle frame with a plastic frame and a metal frame integrated is not applied to the folding electronic devices of the related art.

[0085] In order to solve the problem in the related art that the middle frame integrated with the plastic frame and the metal frame cannot be applied to the foldable electronic device 1, in some embodiments of the present application, the metal frame 110 is provided with a glue hole 112, and the glue hole 112 penetrates the metal frame 110 along the thickness direction of the metal frame 110, and the plastic frame 120 is covered on both sides of the glue hole 112, and a limiting portion 121 is formed on the plastic frame 120 corresponding to the glue hole 112. In this setting, since the metal frame 110 is provided with a glue hole 112, during the injection molding process, the injection molding material is filled into the glue hole 112 to form a limiting portion 121. The plastic frame 120 formed by the injection molding material is an integral structure, that is, the limiting portion 121 and the areas of the first side 1101 and the second side 1102 covered on the outer peripheral edge of the metal frame 110 are respectively an integral structure, thereby increasing the contact area between the glue structure and the metal frame 110, and making a partial area of ​​the plastic frame 120 covered around the area between the glue hole 112 and the first edge 117, so that the plastic frame 120 and the metal frame 110 are relatively limited, thereby improving the glue strength, and preventing the plastic frame 120 from separating from the metal frame 110 to a certain extent. The middle frame 10 of this configuration can be applied to a non-folding electronic device 1 or a folding electronic device 1. Compared with the dovetail groove, the configuration of the glue holes 112 has lower requirements on the thickness of the metal skeleton 110 and can be applied to a shaft area 115 with a thinner thickness.

[0086] like Figures 7 to 11 As shown, in some embodiments, the glue hole 112 is set in the shaft area 115. Since the shaft area 115 is a relatively thin area in the metal frame 110, it is more suitable to form a more stable connection with the plastic frame 120 by means of the glue hole 112. In other thicker areas of the metal frame 110 other than the shaft area 115, other connection structures in the related art can be used to fix the metal frame 110 and the plastic frame 120, for example, dovetail grooves can be set in other areas.

[0087] In some implementations, the glue hole 112 is disposed adjacent to the first edge 117, and the glue hole 112 is spaced from the first edge 117. Along the width direction of the metal frame 110, one side of the shaft area 115 is the first edge 117, and the other side is away from the first edge 117. Relative to the other side of the shaft area 115, the setting position of the glue hole 112 is closer to the first edge 117. In this way, the connection stability of the plastic frame 120 and the first edge 117 of the metal frame 110 can be improved by the limiting portion 121 formed in the glue hole 112, and the first edge 117 of the metal frame 110 and the plastic frame 120 can be further prevented from being separated under the action of external force. In addition, since the shaft area 115 needs to be installed with a rotating shaft mechanism, it is also necessary to provide a connection position for the rotating shaft mechanism. In order to stagger the connection position corresponding to the rotating shaft mechanism, it is more convenient to install the rotating shaft mechanism by arranging the glue hole 112 at a position closer to the first edge 117.

[0088] In some implementations, there are multiple glue holes 112, and the multiple glue holes 112 are spaced apart in the shaft area 115 in the length direction of the metal frame 110. In this way, multiple limit portions 121 are formed by the multiple glue holes 112, and the glue strength between different areas of the metal frame 110 and the plastic frame 120 in the length direction is improved by the multiple limit portions 121.

[0089] The cross-sectional shape of the glue hole 112 in the direction perpendicular to the thickness of the metal frame 110 can be circular, track-shaped, polygonal, elliptical, trapezoidal or other special shapes.

[0090] like Fig.10 As shown, in some implementations, the size of the glue hole 112 in the length direction of the metal frame 110 is L1; in the width direction of the metal frame 110, the size of the glue hole 112 is L2, L1>L2. In this arrangement, since the size of the glue hole 112 in the length direction of the metal frame 110 is larger, when the plastic frame 120 is subjected to external force and is to be separated from the metal frame 110, the contact area between the limit portion 121 of the plastic frame 120 and the metal frame 110 is larger, reducing the stress concentration of the metal frame 110, thereby slowing down or preventing the metal frame 110 from breaking to a certain extent. Since the size of the glue hole 112 in the width direction of the metal frame 110 is smaller, the cross-sectional area of ​​the glue hole 112 is relatively smaller, thereby improving the structural strength of the metal frame 110.

[0091] In some implementations, the glue hole 112 is formed by connecting a plurality of glue walls, and the adjacent glue walls are connected by an arc transition. The glue hole 112 has a hole wall, and the hole wall is formed by connecting a plurality of glue walls, and the adjacent glue walls are connected by an arc transition, so that the glue hole 112 has no edges or corners in the cross-sectional shape perpendicular to the metal frame 110, thereby preventing the metal frame 110 from having stress concentration areas at the edges and corners of the glue hole 112, and reducing the possibility of the metal frame 110 being torn due to stress concentration.

[0092] In some implementations, the metal skeleton 110 includes a middle frame reinforcement portion 114, which is located on the side of the glue hole 112 facing the first edge 117, and the middle frame reinforcement portion 114 protrudes from the first edge 117. The provision of the middle frame reinforcement portion 114 increases the width of the area of ​​the metal skeleton 110 located outside the glue hole 112 (towards the first edge 117), thereby improving the structural strength of the metal skeleton 110. The middle frame reinforcement portion 114 is an integral structure with the middle frame 10 and is manufactured by an integrated molding process.

[0093] In some implementations, the side of the middle frame reinforcement portion 114 away from the first edge 117 has a first inclined surface 1141, a second inclined surface 1142 and a first plane 1143, the first plane 1143 is parallel to the first edge 117, the first inclined surface 1141 and the second inclined surface 1142 are respectively located on both sides of the first plane 1143, and the first inclined surface 1141 and the second inclined surface 1142 are respectively arranged at an obtuse angle to the first plane 1143. In this arrangement, the connection strength between the middle frame reinforcement portion 114 and other areas of the first edge 117 is relatively stronger, which reduces or even avoids tearing at the joint.

[0094] In some implementations, the glue hole 112 is formed by connecting a plurality of glue walls. In the width direction of the metal frame 110, the glue walls include a first glue wall 1121 and a second glue wall 1122 that are spaced apart. The first glue wall 1121 is located between the second glue wall 1122 and the first edge 117. In the length direction of the metal frame 110, the size of the first glue wall 1121 is smaller than the size of the second glue wall 1122. That is, when punching a hole on the metal frame 110, relatively less material is punched out in the area close to the first edge 117, and relatively more material is punched out in the area far from the first edge 117, which makes the structural strength of the area close to the first edge 117 on the metal frame 110 higher.

[0095] like Figure 7 , Figures 11 to 13As shown, in some implementations, there is a height difference between the shaft area 115 and the middle plate area 116, and there is a side elevation 118 between the shaft area 115 and the middle plate area 116, and the side elevation 118 is provided with a glue groove 113, and the plastic frame 120 is formed with a glue reinforcement part 122 corresponding to the glue groove 113. Since the side elevation 118 is provided with the glue groove 113, after injection molding, a reinforcement part is formed on the plastic frame 120 corresponding to the glue groove 113, and the cooperation between the reinforcement part and the glue groove 113 makes the plastic frame 120 and the side elevation 118 relatively limited. In this way, the plastic frame 120 can cover at least part of the side elevation 118. On the other hand, the side elevation 118 and the plastic frame 120 are relatively limited, which increases the limit between the metal frame 110 and the plastic frame 120, and improves the connection strength between the metal frame 110 and the plastic frame 120. At the same time, due to the height difference between the shaft area 115 and the middle plate area 116, the thickness of the side elevation 118 is relatively large. Therefore, compared with the setting of the glue hole 112, the setting of the glue groove 113 at the side elevation 118 can reduce the impact on the structural strength of the side elevation 118 on the basis of ensuring the connection strength between the side elevation 118 and the plastic frame 120. The glue groove 113 is set on the first side 1101 of the side elevation 118, and the depth of the glue groove 113 is less than the thickness of the side elevation 118. Exemplarily, the depth of the glue groove 113 is less than one-third of the thickness of the side elevation 118.

[0096] The glue groove 113 has openings on the side surface 118 and the first side 1101 respectively. In the length direction of the metal frame 110, the opening size of the glue groove 113 located on the side surface 118 is smaller than the size of at least part of the area in the groove of the glue groove 113. In other words, the glue groove 113 is a shrinkage groove, and its opening size is smaller than the size of at least part of the inner cavity. Through the setting of the shrinkage, the glue reinforcement part 122 and the metal frame 110 are relatively limited, thereby improving the connection stability between the plastic frame 120 and the metal frame 110.

[0097] In some implementations, the glue drawing groove 113 includes a dovetail groove. The cross-sectional shape of the dovetail groove in the height direction perpendicular to the metal frame 110 is a trapezoid or a quasi-trapezoidal shape, and the size of the dovetail groove gradually increases from one side close to the shaft area 115 to the other side in the length direction of the metal frame 110. The structural shape of the dovetail groove is simpler, which is convenient for production and manufacturing, and improves production and manufacturing efficiency.

[0098] An embodiment of the present application further provides an electronic device 1, comprising a middle frame 10 of the electronic device 1 provided by any of the above technical solutions.

[0099] Through the above technical solution, since the electronic device 1 includes the middle frame 10 of the electronic device 1, it at least has all the beneficial effects of the middle frame 10 of the electronic device 1, which will not be repeated here.

[0100] The electronic device 1 may be a terminal device with a display interface such as a mobile phone, a television, a display, a tablet computer, or a car computer, or a smart display wearable device such as a smart watch or a smart bracelet, or a communication device such as a server, a storage device, a base station, or a smart car, etc. The embodiment of the present application does not impose any special restrictions on the specific form of the electronic device 1.

[0101] Exemplarily, the electronic device 1 may be a foldable electronic device 1, which includes a display screen, a middle frame 10, a hinge mechanism, and a cover body 40. The display screen includes a first display screen 20 and a second display screen 30. There are two middle frames 10, and both middle frames 10 are the middle frames 10 provided by the above technical solution. The two middle frames 10 are rotatably connected by a hinge mechanism. On one side of the two middle frames 10, the first display screen 20 is laid on the two middle frames 10. On the other side opposite to the two middle frames 10, the second display screen 30 is laid on one of the middle frames 10, and the cover body 40 is installed on the other middle frame 10. The foldable electronic device 1 may be an inner folding type or an outer folding type.

[0102] Since the middle frame 10 of the foldable electronic device 1 adopts the middle frame 10 provided by the above technical solution, the middle frame 10 includes a metal frame 110 and a plastic frame 120 integrally injection-molded with the metal frame 110, and the plastic frame 120 covers the outer peripheral edge of the metal frame 110. The metal frame 110 can be a magnesium alloy frame. The foldable electronic device 1 provided in this embodiment has many advantages such as high structural strength, light weight, and excellent waterproof performance.

[0103] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A middle frame of a foldable electronic device, characterized in that: include: A metal frame, wherein in a thickness direction of the metal frame, the metal frame has a first side and a second side that are separated from each other, in a width direction of the metal frame, the first side is sequentially provided with an axis area and a middle plate area, and an edge of the first side is provided with a drainage groove; A plastic frame wraps the outer side of the shaft area away from the middle plate area and fills the drainage groove.

2. The middle frame according to claim 1, characterized in that: The edge of the first side includes a first edge, and the first edge is an edge of a side of the shaft area away from the middle plate area.

3. The middle frame according to claim 2, characterized in that: The drainage groove is arranged at the first edge, and the bottom wall of the drainage groove comprises a first drainage wall; The first guide wall is inclined from an end away from the first edge to a direction close to the first edge toward a direction close to the second side.

4. The middle frame according to claim 3, characterized in that: The bottom wall of the drainage groove includes a second drainage wall, the second drainage wall is connected to a side of the first drainage wall away from the first edge, and the second drainage wall is perpendicular to the thickness direction of the metal frame.

5. The middle frame according to claim 2, characterized in that: There are multiple drainage grooves, and the multiple drainage grooves are arranged at intervals along the first edge.

6. The middle frame according to any one of claims 2 to 4, characterized in that: The metal frame is provided with a glue hole, which penetrates the metal frame along the thickness direction of the metal frame, the plastic frame covers both sides of the glue hole, and a limiting portion is formed on the plastic frame corresponding to the glue hole.

7. The middle frame according to claim 6, characterized in that: The glue pulling hole is arranged adjacent to the first edge, and the glue pulling hole is arranged at a distance from the first edge.

8. The middle frame according to claim 6, characterized in that: There are multiple glue holes, and the multiple glue holes are spaced apart in the shaft area in the length direction of the metal skeleton.

9. The middle frame according to any one of claims 1 to 8, characterized in that: The metal skeleton is a magnesium alloy skeleton.

10. A foldable electronic device, characterized in that: The electronic device comprises a display screen, a hinge mechanism and a middle frame as claimed in any one of claims 1 to 9.

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