Middle frame and electronic device

Abstract

The application discloses a middle frame and an electronic device. The middle frame comprises a middle plate and a frame. The middle plate comprises a first plate body, the first plate body comprises a first bearing area and a second bearing area, the first bearing area is used for bearing at least a first circuit board, the second bearing area is used for bearing at least a second circuit board, the first bearing area is provided with first through holes and second through holes which are distributed at intervals, and the second bearing area is provided with third through holes. The frame is connected with at least a part of the periphery of the middle plate. The middle frame provided by the application can reduce the weight of the middle plate by providing the first through holes and the second through holes in the first bearing area for bearing the first circuit board and providing the third through holes in the second bearing area for bearing the second circuit board, thereby reducing the weight of the middle frame. In addition, the non-hole areas of the first bearing area and the second bearing area can still provide stable support for the corresponding circuit boards, and ensure that the installation of the circuit boards is not affected.

Description

Technical Field

[0001] This application relates to the field of electronic device technology, and more particularly to a mid-frame and an electronic device. Background Technology

[0002] Electronic devices have become deeply integrated into daily work and life, and users' demand for lightweight design is becoming increasingly strong. Although the use of aluminum alloy to make the mid-frame has reduced the weight of the mid-frame and the electronic device, this method of weight reduction has reached its limit. How to further reduce the weight of the mid-frame while meeting performance requirements is an urgent problem to be solved. Summary of the Invention

[0003] To address the aforementioned technical problems, this application provides a mid-frame and an electronic device.

[0004] A first aspect of this application provides a mid-frame, comprising a mid-plate and a frame. The mid-plate includes a first plate body, which includes a first bearing area and a second bearing area. The first bearing area is used to support at least a first circuit board, and the second bearing area is used to support at least a second circuit board. The first bearing area has spaced-apart first and second through holes, and the second bearing area has a third through hole. The frame is connected to at least a portion of the periphery of the mid-plate.

[0005] The mid-frame provided in this application reduces the weight of the mid-plate and thus the weight of the mid-frame by opening the first and second through holes in the first support area for supporting the first circuit board and the third through hole in the second support area for supporting the second circuit board. Furthermore, the un-holeed areas of the first and second support areas still provide stable support for the corresponding circuit boards, ensuring that the installation of the circuit boards is not affected.

[0006] In one possible implementation, the area of ​​the first bearing region is larger than the area of ​​the second bearing region.

[0007] In one possible implementation, the first projection of the middle frame along a direction perpendicular to the first plate is rectangular. The periphery of the first plate includes a first edge, a second edge, a third edge, and a fourth edge that are connected sequentially. The first edge and the third edge are parallel to the width direction of the first projection, and the second edge and the fourth edge are parallel to the length direction of the first projection. The fourth edge is closer to the first bearing area than the second edge, and the second edge is closer to the second bearing area than the fourth edge. The vertical distance from the first edge to the third edge is a first distance, and the vertical distance from the second edge to the fourth edge is a second distance. The ratios of the dimensions of the first through hole, the second through hole, and the third through hole along the width direction of the first projection to the second distance are 0.14~0.22, 0.15~0.23, and 0.11~0.17, respectively. The ratios of the dimensions of the first through hole, the second through hole, and the third through hole along the length direction of the first projection to the first distance are 0.16~0.24, 0.25~0.38, and 0.32~0.5, respectively.

[0008] In one possible implementation, the ratios of the vertical distances from the center positions of the first through hole, the second through hole, and the third through hole to the first edge to the first distance are 0.29~0.43, 0.64~0.97, and 0.55~0.82, respectively; and the ratios of the vertical distances from the center positions of the first through hole, the second through hole, and the third through hole to the fourth edge to the second distance are 0.14~0.22, 0.46~0.7, and 0.68~1.02, respectively.

[0009] In one possible implementation, the first through hole, the second through hole, and the third through hole are all rectangular holes, and the adjacent two hole walls of each through hole are connected by a circular arc transition, wherein the ratio of the radius of the circular arc to the second distance is 0.024 to 0.069.

[0010] In one possible implementation, the dimensions of the first through hole, the second through hole, and the third through hole along the width direction of the first projection are 4.7mm~7.1mm, 4.4mm~6.6mm, and 3.3mm~5mm, respectively; the dimensions of the first through hole, the second through hole, and the third through hole along the length direction of the first projection are 5mm~7.6mm, 8.8mm~13.5mm, and 11.4mm~17.2mm, respectively; the vertical distances from the center positions of the first through hole, the second through hole, and the third through hole to the first edge are 10mm~15mm, 22mm~34mm, and 19mm~29mm, respectively; and the vertical distances from the center positions of the first through hole, the second through hole, and the third through hole to the fourth edge are 4mm~6.2mm, 13.3mm~21mm, and 19mm~30mm, respectively.

[0011] In one possible implementation, the frame includes a first frame segment with mounting holes for mounting button components. The middle frame also includes a side plate disposed near the first frame segment and parallel to the first frame segment. The side plate includes opposing first and second side plate surfaces, as well as opposing third and fourth side plate surfaces. The first side plate surface faces the first frame segment, and the second side plate surface faces away from the first frame segment and is used to support a third circuit board. The arrangement direction of the third and fourth side plate surfaces is perpendicular to the surface of the first plate. The third side plate surface is farther from the plane of the first plate than the fourth side plate surface, and a blind hole is provided at one end of the third side plate surface.

[0012] In one possible implementation, the side plate further includes a fifth side plate surface and a sixth side plate surface facing away from each other. The projection of the fifth side plate surface onto one side of the first plate body is located inside the first plate body, and the projection of the sixth side plate surface onto one side of the first plate body is located outside the first plate body. Alternatively, the projections of both the fifth and sixth side plate surfaces onto one side of the first plate body are located outside the first plate body, and the projection of the fifth side plate surface onto one side of the first plate body is closer to the first plate body than the projection of the sixth side plate surface onto one side of the first plate body. The vertical distance from the fifth side plate surface to the sixth side plate surface is a third distance, and the vertical distance from the first side plate surface to the second side plate surface is a fourth distance. The blind hole includes a first sub-blind hole and a second sub-blind hole spaced apart along the arrangement direction of the fifth side plate surface and the sixth side plate surface. The ratio of the dimension of the first sub-blind hole and the second sub-blind hole along the arrangement direction of the fifth side plate surface and the sixth side plate surface to the third distance is 0.18~0.29 and 0.46~0.7, respectively. The ratio of the dimension of the first sub-blind hole and the second sub-blind hole along the arrangement direction of the first side plate surface and the second side plate surface to the fourth distance is 0.5~0.75 and 0.17~0.26, respectively. The vertical distance from the bottom wall of the first sub-blind hole to the surface of the second side plate is greater than or equal to 0.2 mm, and the vertical distance from the bottom wall of the second sub-blind hole to the surface of the second side plate is greater than or equal to 0.2 mm.

[0013] In one possible implementation, the ratio of the vertical distance from the center of the first sub-blind hole to the surface of the first side plate to the fourth distance is 0.45 to 0.7, the ratio of the vertical distance from the center of the first sub-blind hole to the surface of the fifth side plate to the third distance is 0.19 to 0.29, the ratio of the vertical distance from the center of the second sub-blind hole to the surface of the first side plate to the fourth distance is 0.5 to 0.75, and the ratio of the vertical distance from the center of the second sub-blind hole to the surface of the fifth side plate to the third distance is 0.6 to 0.91.

[0014] In one possible implementation, the adjacent walls of the blind hole are connected by an arc transition, and the ratio of the radius of the arc to the fourth distance is 0.14 to 0.4.

[0015] In one possible implementation, the dimensions of the first sub-blind hole and the second sub-blind hole along the arrangement directions of the fifth side plate surface and the sixth side plate surface are 2.48mm~3.75mm and 2.3mm~3.5mm, respectively; the dimensions of the first sub-blind hole and the second sub-blind hole along the arrangement directions of the first side plate surface and the second side plate surface are 7.1mm~10.7mm and 6.5mm~9.85mm, respectively; the vertical distances from the center position of the first sub-blind hole and the center position of the second sub-blind hole to the surface of the first side plate are 2.3mm~3.5mm and 2.45mm~3.75mm, respectively; and the vertical distances from the center position of the first sub-blind hole and the center position of the second sub-blind hole to the surface of the fifth side plate are 7.3mm~11mm and 23mm~35mm, respectively.

[0016] In one possible implementation, the frame includes a first frame, which includes a first frame portion. The first frame portion includes an outer side and an inner side facing away from each other. The outer side and the inner side are arranged in a direction parallel to the surface of the first plate. The inner side is closer to the middle plate than the outer side. A groove is formed at one end of the inner side.

[0017] In one possible implementation, the first projection of the middle frame along a direction perpendicular to the first plate is rectangular. The first frame portion includes a first segment, which includes opposing first and second surfaces, opposing third and fourth surfaces, and opposing fifth and sixth surfaces. The inner surface includes the first surface, and the outer surface includes the second surface. A groove is formed at one end where the first surface is located. The arrangement direction of the fifth and sixth surfaces is parallel to the length direction of the first projection. The third surface is farther from the display screen than the fourth surface, and the fifth surface is farther from the first plate than the sixth surface. The vertical distance from the third surface to the fourth surface is the fifth distance, and the vertical distance from the fifth surface to the sixth surface is the sixth distance. The groove includes a first segment, which includes a first segment, a second segment, a third segment, a fourth segment, a fifth segment, a fifth segment, a sixth segment, and a sixth segment. The groove includes a first segment, a second segment, a third segment, a third segment, a fourth segment, a fifth segment, a fifth segment, a sixth segment, and a sixth segment. The first segment includes a first segment, a second segment, a third segment, a third segment, a fourth segment, a fifth segment, a fifth segment, a sixth segment, a fifth segment, a sixth segment, a third ... sixth segment, a fifth segment, a fifth segment, a sixth segment, a fifth segment, a sixth segment, a fifth segment, a sixth segment, a fifth segment The nine sub-grooves are arranged at intervals along the fifth and sixth surfaces. The ratio of the dimension of the nine sub-grooves along the arrangement direction of the fifth and sixth surfaces to the sixth distance is 0.028~0.043, 0.028~0.042, 0.028~0.042, 0.028~0.042, 0.028~0.042, 0.021~0.032, 0.021~0.032, 0.019~0.030, and 0.021~0.032, respectively. The ratio of the dimension of the nine sub-grooves along the arrangement direction of the third and fourth surfaces to the fifth distance is a value within the range of 0.49~0.75. The vertical distance from the bottom wall of the nine sub-grooves to the second surface is greater than or equal to 0.4 mm.

[0018] In one possible implementation, the ratios of the vertical distances from the center positions of the nine sub-grooves to the fifth surface to the sixth distance are 0.06~0.1, 0.15~0.22, 0.18~0.27, 0.21~0.32, 0.24~0.36, 0.27~0.4, 0.32~0.48, 0.51~0.78, and 0.73~1.1, respectively, and the ratios of the vertical distances from the center positions of the nine sub-grooves to the fourth surface to the fifth distance are all values ​​within the range of 0.38~0.58.

[0019] In one possible implementation, the sidewalls and bottomwalls of the groove are connected by an arc transition, the ratio of the radius of the arc to the sixth distance being greater than or equal to 0.69.

[0020] In one possible implementation, the dimensions of the nine sub-grooves along the arrangement directions of the fifth and sixth surfaces are 3.3mm~5mm, 3.3mm~5mm, 3.3mm~5mm, 3.3mm~5mm, 3.3mm~5mm, 2.56mm~3.84mm, 2.56mm~3.84mm, 2.3mm~3.5mm, and 2.56mm~3.84mm, respectively, and the dimensions of the nine sub-grooves along the arrangement directions of the third and fourth surfaces are all 1.4mm~2.2mm; The vertical distances from the center of each of the nine sub-grooves to the fifth surface are 7.6mm~11.4mm, 17.6mm~26.4mm, 21mm~32mm, 24.8mm~37.3mm, 28.5mm~42.7mm, 31.7mm~47.5mm, 37.6mm~56.4mm, 60.9mm~91.3mm, and 86.2mm~129.4mm, respectively. The vertical distances from the center of each of the nine sub-grooves to the fourth surface are all 1.12mm~1.68mm.

[0021] In one possible implementation, the first frame further includes a second frame portion, which is connected between the inner side of the first frame portion and the middle plate. The second outer frame portion includes a support surface for supporting the display screen, and a recess is provided at the end of the second frame portion opposite to the surface of the display screen.

[0022] In one possible implementation, the middle frame has a rectangular first projection along a direction perpendicular to the first plate. The second frame portion includes a second segment, which includes opposing first and second surfaces, opposing third and fourth surfaces, and opposing fifth and sixth surfaces. The bearing surface includes the second surface. The recess is formed at one end where the first surface is located. The arrangement direction of the fifth and sixth surfaces is parallel to the length direction of the first projection. The third surface is farther from the middle plate than the fourth surface, and the fifth surface is farther from the first plate than the sixth surface. The vertical distance from the third surface to the fourth surface is a seventh distance, and the vertical distance from the fifth surface to the sixth surface is an eighth distance. The recess includes eight sub-recesses spaced apart along the arrangement direction of the fifth and sixth surfaces. The ratios of the dimensions of the recesses along the arrangement directions of the fifth and sixth surfaces to the eighth distance are 0.012~0.018, 0.012~0.018, 0.03~0.05, 0.12~0.18, 0.025~0.038, 0.014~0.02, 0.014~0.02, and 0.026~0.04, respectively. The eight sub-recesses are arranged along the third and fourth surfaces... The ratios of the directional dimension to the seventh distance are 0.312~0.468, 0.312~0.468, 0.312~0.468, 0.312~0.468, 0.312~0.468, 0.312~0.468, 0.312~0.468, and 0.312~0.468, respectively; the vertical distance from the bottom wall of the eight sub-recesses to the second surface is greater than or equal to 0.2 mm.

[0023] In one possible implementation, the ratios of the vertical distances from the center positions of the eight sub-recesses to the fifth surface to the eighth distance are 0.016~0.025, 0.062~0.092, 0.09~0.14, 0.15~0.23, 0.28~0.42, 0.3~0.46, 0.34~0.52, and 0.37~0.56, respectively, and the ratios of the vertical distances from the center positions of the eight sub-recesses to the third surface to the seventh distance are all values ​​within the range of 0.49~0.74.

[0024] In one possible implementation, two adjacent sidewalls of the recess are connected by an arc transition, the ratio of the radius of the arc to the eighth distance being 0.16 to 0.44.

[0025] In one possible implementation, the dimensions of the eight sub-recesses along the arrangement directions of the fifth and sixth surfaces are 0.84mm~2.16mm, 0.84mm~2.16mm, 3.92mm~5.88mm, 14.5mm~21.7mm, 2.96mm~4.44mm, 1.6mm~2.4mm, 1.68mm~2.52mm, and 3.12mm~4.68mm, respectively; and the dimensions of the eight sub-recesses along the arrangement directions of the third and fourth surfaces are 1.4mm~2.1mm, 1.4mm~2.1mm, and 1.4mm~2.1mm, respectively. The diameters are 1.12mm~1.68mm, 1.4mm~2.1mm, 1.4mm~2.1mm, 1.4mm~2.1mm, and 1.4mm~2.1mm, respectively; the vertical distances from the center of the eight sub-recesses to the fifth surface are 2mm~3mm, 7.3mm~11mm, 11mm~16.4mm, 18.2mm~27.4mm, 33mm~50mm, 36mm~54mm, 41mm~62mm, and 44mm~66mm, respectively; and the vertical distances from the center of the eight sub-recesses to the fourth surface are all 2.2mm~3.4mm.

[0026] In one possible implementation, the frame includes a second frame and a third frame, the third frame being made of a material with a density greater than that of the second frame, the third frame having a groove on its inner sidewall facing the second frame, and the second frame including a protrusion embedded in the groove.

[0027] In one possible implementation, the third frame includes an inner sidewall and an outer sidewall facing away from each other, the inner sidewall of the third frame being closer to the second frame than the outer sidewall, the ratio of the size of the protrusion to the size of the third frame along the arrangement direction of the inner and outer sidewalls being 0.66 to 1.0, and the ratio of the size of the protrusion to the size of the third frame along the normal direction of the surface of the first plate being 0.73 to 1.1.

[0028] In one possible implementation, the ratio of the vertical distance from the center of the protrusion to the edge of the inner wall of the third frame to the normal dimension of the inner wall of the third frame along the surface of the first plate is 0.4 to 0.6.

[0029] In one possible implementation, the bottom wall and side wall of the trough are connected by an arc transition, and the ratio of the radius of the arc to the dimension of the third frame along the arrangement direction of the inner and outer side walls is 0.58 to 1.67.

[0030] In one possible implementation, the size of the protrusion along the arrangement direction of the inner and outer sidewalls is 0.8mm to 1.2mm, the size of the protrusion along the normal direction of the first plate is 1.6mm to 2.4mm, and the vertical distance from the center of the protrusion to the edge of the inner sidewall of the third frame is 0.88mm to 1.32mm.

[0031] A second aspect of this application provides an electronic device, the electronic device including a mid-frame as described in the first aspect.

[0032] The method for preparing the electronic device is used to prepare the electronic device provided in the first aspect, and therefore can achieve the same or corresponding beneficial effects as the aforementioned electronic device, which will not be described in detail here. Attached Figure Description

[0033] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of the middle frame in some embodiments of this application.

[0035] Figure 2 This is a schematic diagram of the structure of the first plate in some embodiments of this application.

[0036] Figure 3 This is a schematic diagram showing the size and center position of the first through hole in some embodiments of this application.

[0037] Figure 4 This is a schematic diagram showing the size and center position of the second through hole in some embodiments of this application.

[0038] Figure 5 This is a schematic diagram showing the size and center position of the third through hole in some embodiments of this application.

[0039] Figure 6 for Figure 3 A magnified view of A in the middle.

[0040] Figure 7 This is a schematic diagram of the side plate structure in some embodiments.

[0041] Figure 8 This is a schematic diagram showing the size and center position of the first sub-blind hole in some embodiments of this application.

[0042] Figure 9 This is a schematic diagram showing the size and center position of the second sub-blind hole in some embodiments of this application.

[0043] Figure 10 for Figure 7 A magnified view of B in the middle.

[0044] Figure 11 The following is a structural block diagram of the middle frame in some other embodiments of this application.

[0045] Figure 12 This is a schematic diagram of a partial cross-sectional structure obtained by cutting the first border along the Z direction in some embodiments of this application.

[0046] Figure 13 This is a schematic diagram of the structure of the first and second segments from one perspective in some embodiments of this application.

[0047] Figure 14 for Figure 13 A magnified view of C.

[0048] Figure 15 This is a schematic diagram of the structure of the first and second segments along the X direction in some embodiments of this application.

[0049] Figure 16 This is a schematic diagram showing the length of the nine sub-grooves and the vertical distance from their center positions to the fifth surface in some embodiments of this application.

[0050] Figure 17 This is a schematic diagram of the structure of the first and second segments in some embodiments of this application from another perspective.

[0051] Figure 18 for Figure 17 A magnified view of D.

[0052] Figure 19 This is a schematic diagram of the structure of the first and second segments along the Z direction in some embodiments of this application.

[0053] Figure 20 This is a schematic diagram showing the length of the eight sub-recesses and the vertical distance from their center positions to the fifth surface in some embodiments of this application.

[0054] Figure 21 This is a schematic diagram showing the connection between the second border portion and the third border portion in some embodiments of this application.

[0055] Figure 22 This is a schematic diagram of a partial cross-sectional structure of the second and third borders along the Z direction in some embodiments of this application.

[0056] Figure 23 This is a structural block diagram of an electronic device in some embodiments of this application.

[0057] Figure 24 This is a schematic diagram of the structure of the plate blank in some embodiments of this application.

[0058] Figure 25 This is a schematic diagram showing the first displacement corresponding to all first opening regions, the second displacement corresponding to all second opening regions, and the third displacement corresponding to all third opening regions calculated in some embodiments.

[0059] Figure 26 This is a schematic diagram of the structure of a reference plate obtained after drilling holes in a plate blank in related technologies.

[0060] Figure 27 This is a schematic diagram of the structure of the side plate blank in some embodiments of this application.

[0061] Figure 28 This is a schematic diagram of the structure of a reference side plate obtained after drilling holes in a side plate blank in related technologies. Detailed Implementation

[0062] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0063] In the description of this application, the terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," "eighth," and "ninth," etc., are used to distinguish different objects, not to describe a specific order, and therefore should not be construed as limiting this application. The terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application.

[0064] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, "multiple" means two or more.

[0065] It should be noted that the illustrations provided in the embodiments of this application are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0066] In the description of this application, the words "exemplarily" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplarily" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the words "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0067] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The representation of this phrase in various locations throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0068] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the middle frame 400 in some embodiments of this application. Figure 2 This is a schematic diagram of the structure of the first plate 10 in some embodiments of this application. For example... Figure 1 and Figure 2 As shown, the middle frame 400 includes a middle plate 100 and a side frame 200. The middle plate 100 includes a first plate body 10, which includes a first bearing area 11 and a second bearing area 12. The first bearing area 11 is used to support at least a first circuit board, and the second bearing area 12 is used to support at least a second circuit board. The first bearing area 11 has a first through hole TH1 and a second through hole TH2 spaced apart, and the second bearing area has a third through hole TH3. The side frame 200 is connected to at least a portion of the periphery of the middle plate 100.

[0069] The middle frame 400 provided in this application embodiment reduces the weight of the middle plate 100, and thus the weight of the middle frame 400, by opening the first through hole TH1 and the second through hole TH2 in the first support area 11 for supporting the first circuit board, and the third through hole TH3 in the second support area 12 for supporting the second circuit board. Furthermore, the un-holeed areas of the first support area 11 and the second support area 12 can still provide stable support for the corresponding circuit boards, ensuring that the installation of the circuit boards is not affected.

[0070] In addition, when the middle frame 400 is applied to an electronic device, the first plate 10 is separated from the battery of the electronic device, that is, the first plate 10 will not be provided with battery adhesive for bonding the battery, and the first plate 10 does not involve supporting the battery, thereby avoiding problems such as battery falling off due to weight reduction caused by opening through holes.

[0071] In some embodiments, the area of ​​the first bearing region 11 is larger than the area of ​​the second bearing region 12, wherein the area of ​​the first bearing region 11 refers to the area of ​​the largest surface of the first bearing region 11, and the area of ​​the second bearing region 12 refers to the area of ​​the largest surface of the second bearing region 12.

[0072] Since the area of ​​the first bearing region 11 is larger than the area of ​​the second bearing region 12, by opening more through holes in the first bearing region 11, the weight can be reduced while maintaining good strength and rigidity after the holes are opened.

[0073] In some embodiments, the first projection of the middle frame 400 along a direction perpendicular to the first plate 10 is rectangular, and the length direction of the first projection is as follows: Figure 1 As shown in the Y direction, the width direction of the first projection is as follows: Figure 1 As shown in the X direction. Figure 1 The X, Y, and Z directions shown are perpendicular to each other.

[0074] like Figure 2 As shown, the periphery of the first plate 10 includes a first edge 10a, a second edge 10b, a third edge 10c, and a fourth edge 10d that are connected in sequence. The first edge 10a and the third edge 10c are parallel to the width direction of the first projection, and the second edge 10b and the fourth edge 10d are parallel to the length direction of the first projection.

[0075] In some embodiments, such as Figure 2 As shown, the first plate 10 has a camera hole 13, which is used for the camera assembly to pass through and install the camera assembly.

[0076] The fourth edge 10d is closer to the first bearing area 11 than the second edge 10b, the second edge 10b is closer to the second bearing area 12 than the fourth edge 10d, and the first edge 10a is closer to the camera assembly than the third edge 10c. For example... Figure 2 As shown, the vertical distance from the first edge 10a to the third edge 10c is the first distance S1, and the vertical distance from the second edge 10b to the fourth edge 10d is the second distance S2.

[0077] Please see Figure 3 , Figure 3 This is a schematic diagram showing the dimensions and center position of the first through hole TH1 in some embodiments of this application. The ratio of the width W1 (the dimension along the X direction) of the first through hole TH1 to the second distance S2 is 0.14~0.22, and the ratio of the length L1 (the dimension along the Y direction) of the first through hole TH1 to the first distance S1 is 0.16~0.24. The ratio of the vertical distance S11 from the center position C1 of the first through hole TH1 to the first edge 10a to the first distance S1 is 0.29~0.43, and the ratio of the vertical distance S12 from the center position C1 of the first through hole TH1 to the fourth edge 10d to the second distance S2 is 0.14~0.22.

[0078] Please see Figure 4 , Figure 4 This is a schematic diagram showing the dimensions and center position of the second through hole TH2 in some embodiments of this application. The ratio of the width W2 (the dimension along the X direction) of the second through hole TH2 to the second distance S2 is 0.15~0.23, and the ratio of the length L2 (the dimension along the Y direction) of the second through hole TH2 to the first distance S1 is 0.25~0.38. The ratio of the vertical distance S21 from the center position C2 of the second through hole TH2 to the first edge 10a to the first distance S1 is 0.64~0.97, and the ratio of the vertical distance S22 from the center position C2 of the second through hole TH2 to the fourth edge 10d to the second distance S2 is 0.46~0.7.

[0079] Please see Figure 5 , Figure 5 This is a schematic diagram showing the dimensions and center position of the third through hole TH3 in some embodiments of this application. The ratio of the width W3 (the dimension along the X direction) of the third through hole TH3 to the second distance S2 is 0.11~0.17, and the ratio of the length L3 (the dimension along the Y direction) of the third through hole TH3 to the first distance S1 is 0.32~0.5. The ratio of the vertical distance S31 from the center position C3 of the third through hole TH3 to the first edge 10a to the first distance S1 is 0.55~0.82, and the ratio of the vertical distance S32 from the center position C3 of the third through hole TH3 to the fourth edge 10d to the second distance S2 is 0.68~1.02.

[0080] By setting the ratio of the width of the three through holes to the second distance S2 and the ratio of the length of the three through holes to the first distance S1 to be within the above range, the weight reduction rate of the first plate 10 can be greater than or equal to 15% compared to not having the three through holes, and the stiffness loss of the first plate 10 is less than or equal to 10%.

[0081] By setting the ratio of the vertical distance from the center of the three through holes to the first edge 10a to the first distance S1, and the ratio of the vertical distance from the center of the three through holes to the fourth edge 10d to the second distance S2 to be within the above ranges, it is possible to maintain the high overall rigidity and strength of the first plate 10 while achieving weight reduction, and avoid stress concentration.

[0082] In some embodiments, the first through hole TH1, the second through hole TH2, and the third through hole TH3 are all rectangular holes, wherein adjacent holes are connected by a circular arc transition, and the ratio of the radius of the arc to the second distance S2 is 0.024~0.069. The radii of the circular arcs of the first through hole TH1, the second through hole TH2, and the third through hole TH3 may be the same or different.

[0083] By connecting adjacent hole walls with an arc transition, stress concentration can be reduced. Furthermore, by setting the radius of the arcs for the three through holes to 0.024~0.069, the requirements for the drilling tools can be reduced, simplifying the machining process.

[0084] For example, please refer to Figure 6 , Figure 6 for Figure 3 Enlarged view of A. The two adjacent holes of the first through hole TH1 are connected by a first circular arc R1. The ratio of the radius r1 of the first circular arc R1 to the second distance S2 is 0.024~0.069.

[0085] In some embodiments, the radius of the arc between two adjacent holes of the first through hole TH1, the second through hole TH2, and the third through hole TH3 is 0.7mm to 2.0mm.

[0086] In some embodiments, the widths of the first through hole TH1, the second through hole TH2, and the third through hole TH3 are 4.7mm~7.1mm, 4.4mm~6.6mm, and 3.3mm~5mm, respectively; and the lengths of the first through hole TH1, the second through hole TH2, and the third through hole TH3 are 5mm~7.6mm, 8.8mm~13.5mm, and 11.4mm~17.2mm, respectively. The vertical distances from the center position C1 of the first through hole TH1, the center position C2 of the second through hole TH2, and the center position C3 of the third through hole TH3 to the first edge 10a are 10mm~15mm, 22mm~34mm, and 19mm~29mm, respectively; and the vertical distances from the center position C1 of the first through hole TH1, the center position C2 of the second through hole TH2, and the center position C3 of the third through hole TH3 to the fourth edge 10d are 4mm~6.2mm, 13.3mm~21mm, and 19mm~30mm, respectively.

[0087] When the mid-frame 400 is applied to a mobile phone, by setting the width and length of the three through holes to be within the above-mentioned range, and the vertical distance from the center position of the three through holes to the first edge 10a and the fourth edge 10d to be within the above-mentioned range, the weight reduction rate of the first plate 10 of the mid-frame 400 of the mobile phone can be greater than or equal to 15%, the stiffness loss of the first plate 10 is less than or equal to 10%, and the first plate 10 has high overall rigidity and strength, avoiding stress concentration.

[0088] In some embodiments, such as Figure 1 As shown, the frame 200 includes a first frame segment 21, a second frame segment 22, a third frame segment 23 and a fourth frame segment 24 connected in sequence. The first frame segment 21 is provided with a mounting hole for mounting a button assembly.

[0089] In some embodiments, the first border segment 21 and the third border segment 23 are parallel to the Y direction, and the second border segment 22 and the fourth border segment 24 are parallel to the X direction.

[0090] Please see Figure 1 and Figure 7 , Figure 7This is a schematic diagram of the side panel 300 in some embodiments. The middle frame 400 also includes a side panel 300, which is disposed on the middle plate 100 near the first frame segment 21 and is parallel to the first frame segment 21. The side panel 300 includes a first side panel surface 31 and a second side panel surface 32 facing away from each other, as well as a third side panel surface 33 and a fourth side panel surface facing away from each other. The first side panel surface 31 faces the first frame segment 21, and the second side panel surface 32 faces away from the first frame segment 21 and is used to support a third circuit board. The arrangement direction of the third side panel surface 33 and the fourth side panel surface is perpendicular to the surface of the first plate body 10. The third side panel surface 33 is farther away from the plane where the first plate body 10 is located than the fourth side panel surface, and a blind hole BH is formed at one end of the third side panel surface 33.

[0091] By opening a blind hole BH at one end of the third side plate surface 33 of the side plate 300, the weight of the middle frame 400 can be further reduced without affecting the installation and load-bearing capacity of the third circuit board.

[0092] In addition, when the middle frame 400 is applied to an electronic device, the side panel 300 is located inside the electronic device and does not involve the battery backing adhesive or appearance. The opening in the side panel 300 can prevent problems such as battery falling off and will not affect the appearance of the electronic device.

[0093] In some embodiments, such as Figure 7 As shown, the side panel 300 also includes a fifth side panel surface 35 and a sixth side panel surface 36 facing away from each other. The projection of the fifth side panel surface 35 onto one side of the first plate body 10 is located inside the first plate body 10, and the projection of the sixth side panel surface 36 onto one side of the first plate body 10 is located outside the first plate body 10. Alternatively, the projections of both the fifth side panel surface 35 and the sixth side panel surface 36 onto one side of the first plate body 10 are located outside the first plate body 10, and the projection of the fifth side panel surface 35 onto one side of the first plate body 10 is closer to the first plate body 10 than the projection of the sixth side panel surface 36 onto one side of the first plate body 10.

[0094] like Figure 7 As shown, the vertical distance from the fifth side plate surface 35 to the sixth side plate surface 36 is the third distance S3, and the vertical distance from the first side plate surface 31 to the second side plate surface 32 is the fourth distance S4. The blind hole BH includes a first sub-blind hole BH1 and a second sub-blind hole BH2 that are spaced apart along the arrangement direction of the fifth side plate surface 35 and the sixth side plate surface 36.

[0095] Please see Figure 8 , Figure 8This is a schematic diagram showing the dimensions and center position of the first sub-blind hole BH1 in some embodiments of this application. The length L4 of the first sub-blind hole BH1 (i.e., the dimension along the arrangement direction of the fifth side plate surface 35 and the sixth side plate surface 36) is 0.18~0.29 in ratio to the third distance S3. The width W4 of the first sub-blind hole BH1 (i.e., the dimension along the arrangement direction of the first side plate surface 31 and the second side plate surface 32) is 0.5~0.75 in ratio to the fourth distance S4. The vertical distance from the bottom wall of the first sub-blind hole BH1 to the second side plate surface 32 is greater than or equal to 0.2 mm. The ratio of the vertical distance S42 from the center position C4 of the first sub-blind hole BH1 to the first side plate surface 31 to the fourth distance S4 is 0.45~0.7. The ratio of the vertical distance S41 from the center position C4 of the first sub-blind hole BH1 to the fifth side plate surface 35 to the third distance S3 is 0.19~0.29.

[0096] Please see Figure 9 , Figure 9 This is a schematic diagram showing the dimensions and center position of the second sub-blind hole BH2 in some embodiments of this application. The length L5 of the second sub-blind hole BH2 (i.e., the dimension along the arrangement direction of the fifth side plate surface 35 and the sixth side plate surface 36) is 0.46~0.7 in ratio to the third distance S3. The width W5 of the second sub-blind hole BH2 (i.e., the dimension along the arrangement direction of the first side plate surface 31 and the second side plate surface 32) is 0.17~0.26 in ratio to the fourth distance S4. The vertical distance from the bottom wall of the second sub-blind hole BH2 to the second side plate surface 32 is greater than or equal to 0.2 mm. The ratio of the vertical distance S52 from the center position C5 of the second sub-blind hole BH2 to the first side plate surface 31 to the fourth distance S4 is 0.5~0.75. The ratio of the vertical distance S51 from the center position C5 of the second sub-blind hole BH2 to the fifth side plate surface 35 to the third distance S3 is 0.6~0.91.

[0097] The arrangement direction of the fifth side plate surface 35 and the sixth side plate surface is parallel to the length direction of the first projection, that is, parallel to the Y direction, and the arrangement direction of the first side plate surface 31 and the second side plate surface 32 is parallel to the width direction of the first projection, that is, parallel to the X direction.

[0098] By setting the ratio of the width of the two sub-blind holes to the fourth distance S4, and the ratio of the length of the two sub-blind holes to the third distance S3, respectively, within the aforementioned ranges, and ensuring that the vertical distance from the bottom wall of the two sub-blind holes to the surface 32 of the second side plate is greater than or equal to 0.2 mm, the weight reduction rate of the side plate 300 can be greater than or equal to 15% compared to not having the two sub-blind holes, and the stiffness loss of the side plate 300 is less than or equal to 10%. By setting the vertical distance from the bottom wall of the two sub-blind holes to the surface 32 of the second side plate to be greater than or equal to 0.2 mm, the two sub-blind holes can be prevented from penetrating the side plate 300, thereby improving the structural strength and stiffness of the side plate 300.

[0099] By setting the ratio of the vertical distance from the center position of the two sub-blind holes to the surface 31 of the first side plate to the third distance S3, and the ratio of the vertical distance S51 from the center position of the two sub-blind holes to the surface 31 of the first side plate to the third distance to the third distance to the above ranges, the side plate 300 can maintain a high overall rigidity and strength.

[0100] In some embodiments, the depths of the first sub-blind hole BH1 and the second sub-blind hole BH2 are along the Z direction (e.g., Figure 7 The dimension shown is 0.38mm.

[0101] In some embodiments, the adjacent holes of the blind hole BH are connected by an arc transition, and the ratio of the radius of the arc to the fourth distance S4 is 0.14 to 0.4.

[0102] By connecting adjacent hole walls with an arc transition, stress concentration can be reduced. Furthermore, by setting the radius of the arcs for the three through holes to 0.14~0.4, the requirements for the drilling tools can be reduced, simplifying the machining process.

[0103] For example, please refer to Figure 10 , Figure 10 for Figure 7 Enlarged view of B. The two adjacent holes of the first sub-blind hole BH1 are connected by a second circular arc R2, and the ratio of the radius r2 of the second circular arc R2 to the fourth distance S4 is 0.14~0.4.

[0104] In some embodiments, adjacent holes of the first sub-blind hole BH1 are connected by an arc transition, the ratio of the radius of the arc to the fourth distance S4 being 0.14 to 0.4. Adjacent holes of the second sub-blind hole BH2 are also connected by an arc transition, the ratio of the radius of the arc to the fourth distance S4 being 0.14 to 0.4.

[0105] In some embodiments, the radius of the arc between two adjacent hole walls of the first sub-blind hole BH1 is 0.7 mm to 2.0 mm.

[0106] In some embodiments, the widths of the first sub-blind hole BH1 and the second sub-blind hole BH2 are 2.48mm~3.75mm and 2.3mm~3.5mm, respectively, and the lengths of the first sub-blind hole BH1 and the second sub-blind hole BH2 are 7.1mm~10.7mm and 6.5mm~9.85mm, respectively. The vertical distances from the center position C4 of the first sub-blind hole BH1 and the center position C5 of the second sub-blind hole BH2 to the surface 31 of the first side plate are 2.3mm~3.5mm and 2.45mm~3.75mm, respectively, and the vertical distances from the center position C4 of the first sub-blind hole BH1 and the center position C5 of the second sub-blind hole BH2 to the surface 35 of the fifth side plate are 7.3mm~11mm and 23mm~35mm, respectively.

[0107] When the mid-frame 400 is applied to a mobile phone, by setting the width and length of the two sub-blind holes to be within the above-mentioned ranges, and the vertical distance from the center position of the two sub-blind holes to the surface of the first side panel 31 and the surface of the fifth side panel 35 to be within the above-mentioned ranges, the weight reduction rate of the side panel 300 of the mid-frame 400 of the mobile phone can be greater than or equal to 15%, the stiffness loss of the side panel 300 is less than or equal to 10%, and the high overall rigidity and strength of the side panel 300 can be maintained, avoiding stress concentration.

[0108] Please see Figure 11 , Figure 11 This is a structural block diagram of the middle frame 400 in some other embodiments of this application. The border 200 of the middle frame 400 includes a first border 40, a second border 70, and a third border 30. The third border 30 surrounds and is fixedly connected to the second border 70. The second border 70 surrounds and is fixedly connected to the first border 40. The first border 40 surrounds the middle plate 100 and is connected to at least a portion of the periphery of the middle plate. The border 200 is connected to at least a portion of the periphery of the middle plate 100 through the first border 40.

[0109] Please see Figure 11 and Figure 12 , Figure 12 This is a schematic diagram of a partial cross-sectional structure of the first frame 40 along the Z direction in some embodiments of this application. For example... Figure 11 and Figure 12 As shown, the first border 40 includes a first border portion 50. (As indicated...) Figure 12As shown, the first frame portion 50 includes an outer side surface 50a and an inner side surface 50b facing away from each other. The arrangement direction of the outer side surface 50a and the inner side surface 50b is parallel to the surface of the first plate 10. The inner side surface 50b is closer to the middle plate 100 than the outer side surface 50a. A groove G1 is provided at one end of the inner side surface 50b. The vertical distance between the bottom wall of the groove G1 and the outer side surface 50a is greater than 0.

[0110] By creating a groove G1 at one end of the inner side surface 50b of the first frame portion 50, the weight of the middle frame 400 can be further reduced without affecting the appearance of the first frame portion 50.

[0111] Please see Figures 11 to 15 , Figure 13 This is a schematic diagram of the structure of the first segment 51 and the second segment 61 from one viewpoint in some embodiments of this application. Figure 14 for Figure 13 Enlarged view of C in the middle. Figure 15 This is a schematic diagram of the structure of the first segment 51 and the second segment 61 along the X direction in some embodiments of this application. The first frame portion 50 includes the first segment 51, and the second frame portion 60 includes the second segment 61, which is connected to the inner wall of the first segment 51. The extension direction of the first segment 51 is parallel to the length direction of the first projection, that is, parallel to the Y direction. The first segment 51 includes a first side 511 and a second side 512 facing away from each other, a third side 513 and a fourth side 514 facing away from each other, and a fifth side 515 and a sixth side 516 facing away from each other. The inner side 50b includes the first side 511, and the outer side 50a includes the second side 512. A groove G1 is provided at one end where the first side 511 is located. The arrangement direction of the fifth side 515 and the sixth side 516 is parallel to the length direction of the first projection. The third side 513 is farther away from the display screen than the fourth side 514, and the fifth side 515 is farther away from the first plate 10 than the sixth side 516. The vertical distance S61 between the third side 513 and the fourth side 514 is the fifth distance S5, and the vertical distance S62 between the fifth side 515 and the sixth side 516 is the sixth distance S6.

[0112] like Figures 13 to 15 As shown, the groove G1 includes nine sub-grooves G11 spaced apart along the arrangement direction of the fifth surface 515 and the sixth surface 516. Figure 15As shown, the ratios of the lengths of the nine sub-grooves G11 (i.e., the dimensions along the arrangement directions of the fifth surface 515 and the sixth surface 516) to the sixth distance S6 are 0.028~0.043, 0.028~0.042, 0.028~0.042, 0.028~0.042, 0.021~0.032, 0.021~0.032, 0.019~0.030, and 0.021~0.032, respectively. The ratios of the widths of the nine sub-grooves G11 (i.e., the dimensions along the arrangement directions of the third surface 513 and the fourth surface 514) to the fifth distance S5 are all values ​​within the range of 0.49~0.75. The vertical distance from the bottom wall of the nine sub-grooves G11 to the second surface 512 is greater than or equal to 0.4 mm.

[0113] The fifth surface 515 and the sixth surface 516 are arranged in a direction parallel to the length direction of the first projection, i.e., parallel to the Y direction. The third surface 513 and the fourth surface 514 are arranged in a direction (e.g., ...). Figure 12 and Figure 15 The Z direction (in the equation) is perpendicular to the Y and X directions.

[0114] The groove G1 and the mounting hole are spaced apart along the X direction, thereby avoiding affecting the mounting hole when the groove G1 is opened.

[0115] By setting the ratio of the length of the nine sub-grooves G11 to the sixth distance S6 and the ratio of the width of the nine sub-grooves G11 to the fifth distance S5 to be within the aforementioned ranges, and ensuring that the vertical distance from the bottom wall of the nine sub-grooves G11 to the second surface 512 is greater than or equal to 0.4 mm, the weight reduction rate of the first segment 51 of the first frame portion 50 is greater than or equal to 13% compared to when the nine sub-grooves G11 are not present, and the stiffness loss of the first segment 51 of the first frame portion 50 is less than or equal to 10%. By setting the vertical distance from the bottom wall of the nine sub-grooves G11 to the second surface 512 to be greater than or equal to 0.4 mm, the nine sub-grooves G11 can be prevented from penetrating the first segment 51, thereby improving the structural strength and stiffness of the first segment 51.

[0116] In some embodiments, the ratios of the vertical distances from the center of the nine sub-grooves G11 to the fifth surface 515 to the sixth distance S6 are 0.06~0.1, 0.15~0.22, 0.18~0.27, 0.21~0.32, 0.24~0.36, 0.27~0.4, 0.32~0.48, 0.51~0.78, and 0.73~1.1, respectively. The ratios of the vertical distances from the center of the nine sub-grooves G11 to the fourth surface 514 to the fifth distance S5 are all within the range of 0.38~0.58. This arrangement maintains a high overall rigidity and strength of the side plate 300.

[0117] For example, please refer to Figure 16 , Figure 16 This is a schematic diagram showing the lengths of the nine sub-grooves G11 and the vertical distance from their centers to the fifth surface 515 in some embodiments of this application. The lengths of the nine sub-grooves G11 are as follows: Figure 16 As shown in L61, L62, ..., L69. The vertical distances from the center of each of the nine sub-grooves G11 to the fifth surface 515 are respectively as follows: Figure 16 As shown in S61, S62, ..., S69.

[0118] In some embodiments, the depth of the sub-groove G11, i.e., the dimension along the X direction, is greater than or equal to 1 mm and less than or equal to 1.45 mm.

[0119] In some embodiments, the sidewall and bottomwall of the groove G1 are connected by an arc transition, and the ratio of the radius of the arc to the sixth distance S6 is greater than or equal to 0.69.

[0120] By connecting the sidewalls and bottomwalls of the groove with a circular arc transition, stress concentration can be reduced. Furthermore, by setting the radius of the arc between the sidewalls and bottomwalls to be greater than or equal to 0.69, the requirements for the drilling tools can be reduced, simplifying the machining process.

[0121] In some embodiments, the sidewall and bottomwall of the sub-groove G11 are connected by an arc transition, and the ratio of the radius of the arc to the sixth distance S6 is greater than or equal to 0.69.

[0122] In some embodiments, the radius of the arc between the sidewall and bottomwall of the sub-groove G11 is greater than or equal to 2 mm.

[0123] In some embodiments, the dimensions of the nine sub-grooves G11 along the arrangement directions of the fifth surface 515 and the sixth surface 516 are 3.3mm~5mm, 3.3mm~5mm, 3.3mm~5mm, 3.3mm~5mm, 2.56mm~3.84mm, 2.56mm~3.84mm, 2.3mm~3.5mm, and 2.56mm~3.84mm, respectively, and the dimensions of the nine sub-grooves G11 along the arrangement directions of the third surface 513 and the fourth surface 514 are all 1.4mm~2.2mm. The vertical distances from the center of each of the nine sub-grooves G11 to the fifth surface 515 are 7.6mm~11.4mm, 17.6mm~26.4mm, 21mm~32mm, 24.8mm~37.3mm, 28.5mm~42.7mm, 31.7mm~47.5mm, 37.6mm~56.4mm, 60.9mm~91.3mm, and 86.2mm~129.4mm, respectively. The vertical distances from the center of each of the nine sub-grooves G11 to the fourth surface 514 are all 1.12mm~1.68mm.

[0124] When the mid-frame 400 is applied to a mobile phone, by setting the width and length of the nine sub-grooves G11 to be within the above-mentioned range, and the vertical distance from the center position of the nine sub-grooves G11 to the fifth surface 515 and the fourth surface 514 to be within the above-mentioned range, the weight reduction rate of the first segment 51 of the first frame portion 50 of the mid-frame 400 of the mobile phone is greater than or equal to 13%, the stiffness loss of the first segment 51 is less than or equal to 10%, and the high overall rigidity and strength of the first segment 51 can be maintained, avoiding stress concentration.

[0125] In some embodiments, such as Figure 11 As shown, the first frame 40 also includes a second frame portion 60, which is connected between the inner side 50b side of the first frame portion 50 and the middle plate 100. The second frame portion 60 includes a supporting surface 60a for supporting the display screen, and a recess G2 is provided at the end of the second frame portion 60 that is away from the surface of the display screen.

[0126] By creating a recess G2 at the end of the second frame portion 60 that is away from the surface of the display screen, the weight of the middle frame 400 can be further reduced without affecting the installation and support of the display screen.

[0127] In some embodiments, the first frame portion 50 and the second frame portion 60 are annular, the first frame portion 50 surrounds the second frame portion 60, and the second frame portion 60 is connected to at least a portion of the periphery of the middle plate 100.

[0128] Please see Figures 11 to 12 , Figures 17 to 19 , Figure 17 This is a schematic diagram of the structure of the first segment 51 and the second segment 61 in some embodiments of this application from another perspective. Figure 18 for Figure 17 Enlarged view of D in the middle. Figure 19 This is a schematic diagram of the structure of the first segment 51 and the second segment 61 along the Z direction in some embodiments of this application. The extension direction of the second segment 61 is parallel to the length direction of the first projection, that is, parallel to the Y direction. The second segment 61 includes a first surface 611 and a second surface 612 facing away from each other, a third surface 613 and a fourth surface 614 facing away from each other, and a fifth surface 615 and a sixth surface 616 facing away from each other. The bearing surface 60a includes the second surface 612. The recess G2 is formed at one end where the first surface 611 is located. The arrangement direction of the fifth surface 615 and the sixth surface 616 is parallel to the length direction of the first projection. The third surface 613 is farther away from the middle plate 100 than the fourth surface 614, and the fifth surface 615 is farther away from the first plate 10 than the sixth surface 616. The vertical distance from the third surface 613 to the fourth surface 614 is the seventh distance S7, and the vertical distance from the fifth surface 615 to the sixth surface 616 is the eighth distance S8.

[0129] like Figures 17 to 19 As shown, the recess G2 includes eight sub-recesses G21 spaced apart along the arrangement direction of the fifth surface 615 and the sixth surface 616. Figure 19 As shown, the ratios of the lengths of the eight sub-recesses G21 (i.e., the dimensions along the arrangement directions of the fifth surface 615 and the sixth surface 616) to the eighth distance S8 are 0.012~0.018, 0.012~0.018, 0.03~0.05, 0.12~0.18, 0.025~0.038, 0.014~0.02, 0.014~0.02, and 0.026~0.04, respectively. The ratios of the widths of the eight sub-recesses G21 (i.e., the dimensions along the third surface 613 and the fourth surface 614) to the seventh distance S7 are 0.312~0.468, 0.312~0.468, 0.312~0.468, 0.312~0.468, 0.312~0.468, 0.312~0.468, and 0.312~0.468, respectively. The vertical distance from the bottom wall of each of the eight sub-recesses G21 to the second surface 612 is greater than or equal to 0.2 mm.

[0130] The fifth surface 615 and the sixth surface 616 are arranged in a direction parallel to the length direction of the first projection, i.e., parallel to the Y direction, while the third surface 613 and the fourth surface 614 are arranged in a direction parallel to the X direction.

[0131] By setting the ratio of the length of the eight sub-recesses G21 to the eighth distance S8 and the ratio of the width of the eight sub-recesses G21 to the seventh distance S7 to be within the aforementioned ranges, and ensuring that the vertical distance from the bottom wall of the eight sub-recesses G21 to the second surface 612 is greater than or equal to 0.2 mm, the weight reduction rate of the second segment 61 of the second frame portion 60 is greater than or equal to 13% compared to the absence of the eight sub-recesses G21, and the stiffness loss of the second segment 61 of the second frame portion 60 is less than or equal to 10%. By setting the vertical distance from the bottom wall of the eight sub-recesses G21 to the second surface 612 to be greater than or equal to 0.2 mm, the eight sub-recesses G21 can be prevented from penetrating the second segment 61, thereby improving the structural strength and stiffness of the second segment 61.

[0132] In some embodiments, the ratios of the vertical distances from the center of the eight sub-recesses G21 to the fifth surface 615 to the eighth distance S8 are 0.016~0.025, 0.062~0.092, 0.09~0.14, 0.15~0.23, 0.28~0.42, 0.3~0.46, 0.34~0.52, and 0.37~0.56, respectively, and the ratios of the vertical distances from the center of the eight sub-recesses G21 to the third surface 613 to the seventh distance S7 are all values ​​within the range of 0.49~0.74. This arrangement can maintain a high overall rigidity and strength of the side plate 300.

[0133] Please see Figure 20 , Figure 20 This is a schematic diagram showing the lengths of the eight sub-recesses G21 and the vertical distance from their center positions to the fifth surface 615 in some embodiments of this application. For example... Figure 20 As shown, the lengths of the eight sub-recesses G21 are respectively as follows: Figure 15 As shown in L71, L72, ..., L78. The vertical distances from the center of the eight sub-recesses G21 to the fifth surface 615 are respectively as shown in... Figure 15 As shown in S71, S72, ..., S78.

[0134] In some embodiments, the two adjacent sidewalls of the recess G2 are connected by an arc transition, and the ratio of the radius of the arc to the eighth distance is 0.16 to 0.44.

[0135] By connecting adjacent sidewalls of the recess G2 with an arc transition, stress concentration can be reduced. Furthermore, by setting the radius of the arc between adjacent sidewalls to 0.16~0.44, the requirements for the drilling tool can be reduced, simplifying the machining process.

[0136] In some embodiments, the two adjacent sidewalls of the sub-recess G21 are connected by an arc transition, and the ratio of the radius of the arc to the eighth distance is 0.16 to 0.44.

[0137] In some embodiments, the radius of the arc between two adjacent sidewalls of the sub-recess G21 is greater than or equal to 0.7 mm.

[0138] In some embodiments, the lengths of the eight sub-recesses G21 are 0.84mm~2.16mm, 0.84mm~2.16mm, 3.92mm~5.88mm, 14.5mm~21.7mm, 2.96mm~4.44mm, 1.6mm~2.4mm, 1.68mm~2.52mm, and 3.12mm~4.68mm, respectively, and the widths of the eight sub-recesses G21 are 1.4mm~2.1mm, 1.4mm~2.1mm, 1.12mm~1.68mm, 1.4mm~2.1mm, 1.4mm~2.1mm, 1.4mm~2.1mm, and 1.4mm~2.1mm, respectively. The vertical distances from the center of the eight sub-recesses G21 to the fifth surface 615 are 2mm~3mm, 7.3mm~11mm, 11mm~16.4mm, 18.2mm~27.4mm, 33mm~50mm, 36mm~54mm, 41mm~62mm, and 44mm~66mm, respectively. The vertical distances from the center of the eight sub-recesses G21 to the fourth surface 614 are all 2.2mm~3.4mm.

[0139] When the mid-frame 400 is applied to a mobile phone, by setting the width and length of the eight sub-recesses G21 to be within the above-mentioned range, and the vertical distance from the center position of the eight sub-recesses G21 to the fifth surface 615 and the fourth surface 614 to be within the above-mentioned range, the weight reduction rate of the second segment 61 of the second frame portion 60 of the mid-frame 400 of the mobile phone is greater than or equal to 10%, the stiffness loss of the second segment 61 is less than or equal to 10%, and the high overall rigidity and strength of the second segment 61 can be maintained, avoiding stress concentration.

[0140] Please see Figure 21 , Figure 21 This is a schematic diagram showing the connection between a portion of the second border 70 and a portion of the third border 30 in some embodiments of this application. Figure 22This is a schematic diagram of a partial cross-sectional structure of the second frame 70 and the third frame 30 along the Z direction in some embodiments of this application. In some embodiments, the third frame 30 includes an inner sidewall 301 and an outer sidewall 302 facing away from each other. The inner sidewall 301 of the third frame 30 is closer to the second frame 70 than the outer sidewall 302. The outer sidewall of the second frame 70 is connected to the inner sidewall 301 of the third frame 30. The inner sidewall of the second frame 70 is connected to the first frame portion 50. The density of the material of the third frame 30 is greater than the density of the material of the second frame 70. A groove G3 is formed on the inner sidewall of the third frame 30 facing the second frame 70. The second frame 70 includes a protrusion 71 embedded in the groove G3.

[0141] By opening the groove G3 on the inner sidewall of the third frame 30 with a higher material density, and setting the second frame 70 with a lower material density to have a protrusion 71, and the protrusion 71 is embedded in the groove G3, not only can the connection strength between the third frame 30 and the second frame 70 be enhanced, but the weight of the middle frame 400 can also be further reduced, without affecting the performance of the frame 200 or the appearance of the third frame 30.

[0142] In some embodiments, the third frame 30 is made of metal, such as aluminum, aluminum alloy, or other metals. The second frame 70 is made of plastic, such as PC, ABS, or other plastics.

[0143] In some embodiments, the ratio of the thickness of the protrusion 71 (i.e., the dimension along the arrangement direction of the outer sidewall 302 and the inner sidewall 301 of the third frame 30) to the thickness of the third frame 30 (i.e., the dimension along the arrangement direction of the outer sidewall 302 and the inner sidewall 301 of the third frame 30) is 0.66 to 1.0, and the ratio of the width of the protrusion 71 (i.e., the dimension along the normal direction of the surface of the first plate 10) to the width of the third frame 30 (i.e., the dimension along the normal direction of the surface of the first plate 10) is 0.73 to 1.1.

[0144] This allows the weight reduction rate of the third frame 30 and the second frame 70 to be greater than or equal to 10% compared to not having the groove G3 and having the protrusion 71, and the stiffness loss of the third frame 30 and the second frame 70 to be less than or equal to 10%.

[0145] In some embodiments, the outer sidewall 302 and inner sidewall 301 of the third frame 30 are arranged parallel to the X direction (e.g., Figure 21 and Figure 22As shown), the normal direction of the surface of the first plate 10 is parallel to the Z direction. In other embodiments, the outer sidewall 302 and inner sidewall 301 of the third frame 30 are arranged parallel to the Y direction.

[0146] In some embodiments, the ratio of the vertical distance from the center of the protrusion 71 to the edge of the inner sidewall 301 of the third frame 30 to the dimension of the inner sidewall 301 of the third frame 30 along the normal direction of the surface of the first plate 10 is 0.4 to 0.6. This arrangement can maintain high overall rigidity and strength of the third frame 30 and the second frame 70.

[0147] In some embodiments, the bottom wall and side wall of the groove G3 are connected by an arc transition, and the ratio of the radius of the arc to the dimension of the third frame 30 along the arrangement direction of the outer side wall 302 and the inner side wall 301 is 0.58 to 1.67.

[0148] By setting the bottom wall and side wall of the tank G3 to be connected by a circular arc transition, stress concentration can be reduced.

[0149] In some embodiments, the radius of the arc between the bottom wall and the side wall of the tank G3 is greater than or equal to 0.7 mm.

[0150] In some embodiments, the thickness of the protrusion 71 is 0.8mm to 1.2mm, the width of the protrusion 71 is 1.6mm to 2.4mm, and the vertical distance from the center of the protrusion 71 to the edge of the inner sidewall 301 of the third frame 30 is 0.88mm to 1.32mm.

[0151] When the mid-frame 400 is applied to a mobile phone, by setting the thickness and width of the protrusion 71 to be within the above-mentioned range, and the vertical distance from the center position of the protrusion 71 to the edge of the inner sidewall 301 of the third frame 30 to be within the above-mentioned range, the weight reduction rate of the third frame 30 and the second frame 70 of the mid-frame 400 of the mobile phone can be greater than or equal to 10%, the stiffness loss of the third frame 30 and the second frame 70 is less than or equal to 10%, and the high overall rigidity and strength of the third frame 30 and the second frame 70 can be maintained, avoiding stress concentration.

[0152] In some embodiments, such as Figure 11 As shown, the second border 70 includes a third segment 72, and the third border 30 includes a fourth segment 37. The extension directions of the third segment 72 and the fourth segment 37 are parallel to the Y direction and close to the first segment 51 and the second segment 61. The first border segment 21 includes the first segment 51, the second segment 61, the third segment 72, and the fourth segment 37.

[0153] In some embodiments, the first frame 40, the middle plate 100, and the side plate 300 may be made of metal or other materials.

[0154] In some embodiments, the sixth surface 516 is closer to the mounting hole than the fifth surface 515, and the sixth surface 616 is closer to the mounting hole than the fifth surface 615.

[0155] Please see Figure 23 , Figure 23 This is a structural block diagram of an electronic device 500 in some embodiments of this application. The electronic device 500 includes the middle frame 400 described in any of the foregoing embodiments.

[0156] In some embodiments, the electronic device 500 further includes the aforementioned first circuit board, second circuit board, third circuit board, display screen, and camera assembly.

[0157] In some embodiments, the first circuit board may be a main circuit board, which houses the core processor, memory, power management chip, baseband chip, etc. The second circuit board may be electrically connected between the main circuit board and the camera assembly and / or display screen, and the third circuit board may be electrically connected between the main circuit board and the button assembly and / or fingerprint assembly.

[0158] In some embodiments, the third circuit board is a flexible circuit board.

[0159] The electronic device 500 involved in this application embodiment can be various types of terminal devices, and this application embodiment does not limit its specific type. For example, the electronic device can be a mobile phone, tablet computer, desktop computer, laptop computer, handheld computer, smart screen, wearable device, augmented reality (AR) device, virtual reality (VR) device, artificial intelligence (AI) device, vehicle system, smart headphones, game console, and can also be Internet of Things (IoT) device or smart home device such as smart TV, etc.

[0160] This application provides a method for manufacturing a middle frame 400 in some embodiments, for manufacturing the middle frame 400 described in any of the preceding embodiments.

[0161] Please see Figure 24 , Figure 24 This is a schematic diagram of the structure of the plate blank 1 in some embodiments of this application. In some embodiments, the manufacturing method includes the following steps: S11: Provide 1 medium plate blank.

[0162] S12: Determine the weight reduction area 1a of the medium plate blank.

[0163] S13: Based on the weight reduction area 1a of the middle plate blank, the first process parameters of the first hole-opening tool, the target performance of the middle plate 100, the target weight reduction rate of the middle plate 100, and the first test conditions, determine the first target structural parameters, the second target structural parameters, and the third target structural parameters.

[0164] S14: Based on the first target structural parameters, the second target structural parameters and the third target structural parameters, the first hole-making tool is used to make holes in the middle plate blank 1 to form the aforementioned first through hole TH1, second through hole TH2 and third through hole TH3, thereby obtaining the aforementioned middle plate 100.

[0165] In this embodiment, the weight reduction area 1a of the middle plate blank 1 can be selected from the flat area of ​​the middle plate blank 1. In some embodiments, the weight reduction area 1a of the middle plate blank includes a first bearing area blank 101 and a second bearing area blank 102. After the hole-making process is performed, the first bearing area blank 101 and the second bearing area blank 102 respectively form the aforementioned first bearing area 11 and second bearing area 12.

[0166] The first process parameter includes the first chamfer radius of the first hole-opening tool. The first chamfer radius is equal to the radius of the arc between two adjacent hole walls of the aforementioned first through hole TH1, the radius of the arc between two adjacent hole walls of the aforementioned second through hole TH2, and the radius of the arc between two adjacent hole walls of the aforementioned third through hole TH3. The first through hole TH1, the second through hole TH2, and the third through hole TH3 can be formed using first hole-opening tools with the same or different first chamfer radii.

[0167] The target performance of the middle plate 100 includes that the stiffness loss value of the middle plate 100 is less than a preset stiffness loss value. In some embodiments, the preset stiffness loss value may be 10%, or it may be other values.

[0168] The target weight reduction rate of the middle plate 100 is greater than 15%, but other values ​​are also possible.

[0169] The first test conditions include fixing the opposite ends of the middle plate blank 1 and applying a downward pressure of 10N to the middle region of the middle plate blank 1.

[0170] The first edge, second edge, third edge, and fourth edge of the middle plate blank 1 are the first edge 10a, second edge 10b, third edge 10c, and fourth edge 10d of the aforementioned middle plate 100.

[0171] The first target structural parameters include the ratio of the width W1 of the first through hole TH1 to the second distance S2, the ratio of the length L1 of the first through hole TH1 to the first distance S1, the ratio of the vertical distance from the center position C1 of the first through hole TH1 to the first edge of the middle plate blank 1 to the first distance S1, and the ratio of the vertical distance from the center position C1 of the first through hole TH1 to the fourth edge of the middle plate blank 1 to the second distance S2.

[0172] The second target structural parameters include the ratio of the width W2 of the second through hole TH2 to the second distance S2, the ratio of the length L2 of the second through hole TH2 to the first distance S1, the ratio of the vertical distance from the center position C2 of the second through hole TH2 to the first edge of the middle plate blank 1 to the first distance S1, and the ratio of the vertical distance from the center position C2 of the second through hole TH2 to the fourth edge of the middle plate blank 1 to the second distance S2.

[0173] The third target structural parameters include the ratio of the width W3 of the aforementioned third through hole TH3 to the aforementioned second distance S2, the ratio of the length L3 of the third through hole TH3 to the aforementioned first distance S1, the ratio of the vertical distance from the center position C3 of the third through hole TH3 to the first edge of the middle plate blank 1 to the first distance S1, and the ratio of the vertical distance from the center position C3 of the third through hole TH3 to the fourth edge of the middle plate blank 1 to the second distance S2.

[0174] In some embodiments, step S13, "based on the weight reduction area 1a of the middle plate blank, the first process parameters of the first drilling tool, the target performance of the middle plate 100, the target weight reduction rate of the middle plate 100, and the first test conditions, determining the first target structural parameters, the second target structural parameters, and the third target structural parameters," includes: S131: Determine the areas of the first through hole TH1, the second through hole TH2, and the third through hole TH3 based on the target weight reduction rate of the middle plate 100 and the thickness of the weight reduction area 1a.

[0175] S132: Select a plurality of first opening areas, a plurality of second opening areas, and a plurality of third opening areas on the weight reduction area 1a of the middle plate blank, wherein the area of ​​each first opening area is equal to the area of ​​the first through hole TH1, the area of ​​each second opening area is equal to the area of ​​the second through hole TH2, and the area of ​​each third opening area is equal to the area of ​​the third through hole TH3.

[0176] S133: Simulate opening for any first opening area, and after simulating opening, perform displacement simulation test on the middle plate blank 1 under the first test conditions to calculate the corresponding first displacement, thereby obtaining multiple first displacements.

[0177] S134: Take the first opening area corresponding to the minimum first displacement as the target first opening area.

[0178] S135: Simulate opening for any second opening area, and after simulating opening, perform displacement simulation test on the middle plate blank 1 under the first test conditions to calculate the corresponding second displacement, thereby obtaining multiple second displacements.

[0179] S136: Take the second opening area corresponding to the minimum second displacement as the target second opening area.

[0180] S137: Simulate opening for any third opening area, and after simulating opening, perform displacement simulation test on the middle plate blank 1 under the first test conditions to calculate the corresponding third displacement, thereby obtaining multiple third displacements.

[0181] S138: Take the third opening area corresponding to the minimum third displacement as the target third opening area.

[0182] S139: Simulate opening the first opening area, the second opening area, and the third opening area of ​​the target, and perform a stiffness simulation test on the middle plate blank 1 after the simulated opening to calculate the stiffness loss value.

[0183] S140: When the calculated stiffness loss value of the middle plate blank 1 is less than the preset stiffness loss value, the structural parameters of the target first opening area are used as the first target structural parameters of the first through hole TH1, the structural parameters of the target second opening area are used as the second target structural parameters of the second through hole TH2, and the structural parameters of the target third opening area are used as the third target structural parameters of the third through hole TH3.

[0184] Wherein, the thickness of the weight-reduction region 1a is the dimension along the direction perpendicular to the middle plate blank 1. The area of ​​each opening region in the first, second, and third opening regions is the area of ​​the projection of each opening region along the Z direction. The area of ​​each through hole in the first through hole TH1, second through hole TH2, and third through hole TH3 is the area of ​​the projection of each through hole along the Z direction.

[0185] Wherein, the first opening area is used to form the first through hole TH1, the second opening area is used to form the second through hole TH2, and the third opening area is used to form the third through hole TH3.

[0186] In some embodiments, steps S131 to S140 can be executed using a preset model.

[0187] Please see Figure 25 , Figure 25 This is a schematic diagram showing the first displacement corresponding to all first opening regions, the second displacement corresponding to all second opening regions, and the third displacement corresponding to all third opening regions calculated in some embodiments. Figure 25 Each point in (a) is mapped to the center position of a first opening region. Figure 25 (a) illustrates the vertical distance from the center of each first opening area to the first and fourth edges of the middle plate blank 1, and the corresponding first displacement obtained by test calculation after simulating the opening of each first opening area. Figure 25 Each point in (b) is mapped to the center position of a second opening region. Figure 25 (b) illustrates the vertical distance from the center position of each second opening area to the first and fourth edges of the middle plate blank 1, and the corresponding second displacement obtained by test calculation after simulating the opening of each second opening area. Figure 25 Each point in (c) is mapped to the center position of a third opening region. Figure 25 (c) illustrates the vertical distance from the center of each third opening area to the first and fourth edges of the middle plate blank 1, and the corresponding third displacement obtained by test calculation after simulating the opening of each third opening area.

[0188] The structural parameters of the opening region corresponding to the minimum displacement are used as the target structural parameters of the through hole. Specifically, the ratio of the width of the opening region corresponding to the minimum displacement to the second distance S2, the ratio of its length to the first distance S1, and the perpendicular distance from the center position of the opening region to the first and fourth edges of the middle plate blank 1 are used as the ratio of the width of the through hole to the second distance S2, the ratio of its length to the first distance S1, and the perpendicular distance from the center position of the through hole to the first and fourth edges of the middle plate 100. The width and length of the opening region are parallel to the X and Y directions, respectively.

[0189] Please see Figure 26 , Figure 26This is a schematic diagram of a reference middle plate 100a obtained by drilling holes in a middle plate blank 1 in the related art. Compared to the middle plate blank 1, the reference middle plate 100a in the related art has a stiffness loss of 12.6% and a weight reduction rate of 3.6%, while the middle plate 100 provided in this embodiment has a stiffness loss of 8.7% and a weight reduction rate of 18.7% compared to the middle plate blank 1. That is, compared to the reference middle plate 100a in the related art, the middle plate 100 provided in this embodiment has a 31% reduction in stiffness loss and a 417% increase in weight reduction, thereby significantly improving the weight reduction rate and reducing the stiffness loss caused by drilling holes.

[0190] Please see Figure 27 , Figure 27 This is a schematic diagram of the side plate blank 2 in some embodiments of this application. In some embodiments, the manufacturing method includes the following steps: S21: Provide side plate blank 2.

[0191] S22: Determine the area 2a to be reduced in the side plate blank.

[0192] S23: Based on the weight reduction area 2a of the side plate blank, the second process parameters of the second hole-making tool, the target performance of the side plate 300, the target weight reduction rate of the side plate 300, and the second test conditions, determine the fourth target structural parameter and the fifth target structural parameter.

[0193] S24: Based on the fourth and fifth target structural parameters, the second drilling tool is used to drill holes in the side plate blank 2 to form the aforementioned first sub-blind hole BH1 and second sub-blind hole BH2, thereby obtaining the aforementioned side plate 300.

[0194] The weight reduction area 2a of the side plate blank includes the end where the first side plate surface 31 is located.

[0195] The second process parameter includes the second chamfer radius of the second opening tool. The second chamfer radius is equal to the radius of the arc between two adjacent hole walls of the aforementioned first sub-blind hole BH1 and the radius of the arc between two adjacent hole walls of the aforementioned second sub-blind hole BH2. The first sub-blind hole BH1 and the second sub-blind hole BH2 can be formed using a second opening tool with the same or different second chamfer radii.

[0196] The target performance of the side plate 300 includes that the stiffness loss value of the side plate 300 is less than the preset stiffness loss value.

[0197] The target weight reduction rate of the side plate 300 is greater than 15%, but other values ​​are also possible.

[0198] The second test condition includes fixing the opposite ends of the side plate blank 2 and applying a downward pressure of 10N to the middle region of the side plate blank 2.

[0199] The fourth target structural parameters include the ratio of the width W4 of the first sub-blind hole BH1 to the aforementioned fourth distance S4, the ratio of the length L4 of the first sub-blind hole BH1 to the aforementioned third distance S3, the ratio of the vertical distance S42 from the center position C4 of the first sub-blind hole BH1 to the surface 31 of the first side plate to the fourth distance S4, the ratio of the vertical distance S41 from the center position C4 of the first sub-blind hole BH1 to the surface 35 of the fifth side plate to the third distance S3, and the vertical distance from the bottom wall of the first sub-blind hole BH1 to the surface 32 of the aforementioned second side plate.

[0200] The fifth target structural parameters include the ratio of the width W5 of the second sub-blind hole BH2 to the aforementioned fourth distance S4, the ratio of the length L5 of the second sub-blind hole BH2 to the aforementioned third distance S3, the ratio of the vertical distance S52 from the center position C5 of the second sub-blind hole BH2 to the surface 31 of the first side plate to the fourth distance S4, the ratio of the vertical distance S51 from the center position C5 of the second sub-blind hole BH2 to the surface 35 of the fifth side plate to the third distance S3, and the vertical distance from the bottom wall of the second sub-blind hole BH2 to the aforementioned surface 32 of the second side plate.

[0201] In some embodiments, step S23, "determining the fourth and fifth target structural parameters based on the weight reduction area 2a of the side plate blank, the second process parameters of the second drilling tool, the target performance of the side plate 300, the target weight reduction rate of the side plate 300, and the second test conditions," includes: S231: Determine the depths of the first sub-blind hole BH1 and the second sub-blind hole BH2 based on the dimensions of the side plate blank 2 along the Z direction.

[0202] S232: Determine the area of ​​the first sub-blind hole BH1 and the second sub-blind hole BH2 based on the target weight reduction rate of the side plate 300 and the depths of the first sub-blind hole BH1 and the second sub-blind hole BH2.

[0203] S233: Select multiple fourth opening areas and multiple fifth opening areas on the weight reduction area 2a of the side plate blank, wherein the area of ​​each fourth opening area is equal to the area of ​​the first sub-blind hole BH1, and the area of ​​each fifth opening area is equal to the area of ​​the second sub-blind hole BH2.

[0204] S234: Simulate opening in any fourth opening area, and after simulating opening, perform displacement simulation test on the side plate blank 2 under the second test conditions to calculate the corresponding fourth displacement, thereby obtaining multiple fourth displacements.

[0205] S235: Take the fourth opening area corresponding to the minimum fourth displacement as the target fourth opening area.

[0206] S236: Simulate opening in any fifth opening area, and after simulating opening, perform displacement simulation test on the side plate blank 2 under the second test conditions to calculate the corresponding fifth displacement, thereby obtaining multiple fifth displacements.

[0207] S237: Take the fifth opening area corresponding to the minimum fifth displacement as the target fifth opening area.

[0208] S238: Simulate opening in the fourth opening area and the fifth opening area of ​​the target, and perform stiffness simulation test on the side plate blank 2 after the simulated opening to calculate the stiffness loss value.

[0209] S239: When the calculated stiffness loss value of the side plate blank 2 is less than the preset stiffness loss value, the structural parameters of the target fourth opening area are used as the fourth target structural parameters of the first sub-blind hole BH1, and the structural parameters of the target second opening area are used as the fifth target structural parameters of the second sub-blind hole BH2.

[0210] The areas of the first sub-blind hole BH1, the second sub-blind hole BH2, the fourth opening area, and the fifth opening area refer to the areas projected along the Z direction.

[0211] In some embodiments, steps S231 to S239 can be executed using a preset model.

[0212] Please see Figure 28 , Figure 28 This is a schematic diagram of a reference side plate 300a obtained by drilling holes in the side plate blank 2 in the related art. Compared to the side plate blank 2, the reference side plate 300a in the related art has a stiffness loss of 21.4% and a weight reduction rate of 14.7%. In contrast, the side plate 300 provided in an embodiment of this application has a stiffness loss of 10% and a weight reduction rate of 17.6% compared to the side plate blank 2. That is, compared to the reference side plate 300a in the related art, the side plate 300 provided in this embodiment of the application has a 53% reduction in stiffness loss and a 20% increase in weight reduction, thereby improving the weight reduction rate and significantly reducing the stiffness loss caused by the drilling.

[0213] In some embodiments, the manufacturing method includes the steps of: S31: Provides a border blank.

[0214] S32: Determine the area to be weight-reduced in the edge component blank.

[0215] S33: Based on the weight reduction area of ​​the frame blank, the third process parameters of the third hole-opening tool, the target performance of the frame, the target weight reduction rate of the frame, and the third test conditions, determine the sixth target structural parameters.

[0216] S34: Based on the sixth target structural parameters, the third hole-making tool is used to make a hole in the frame blank to form a recess, thereby obtaining the frame part.

[0217] The third process parameter includes the third chamfer radius of the third hole-opening tool.

[0218] The target performance of the frame portion includes that the stiffness loss value of the frame portion is less than the preset stiffness loss value.

[0219] The target weight reduction rate of the border portion is greater than 13%, but it can also be other values.

[0220] The third test condition includes fixing the opposite ends of the frame blank and applying a downward pressure of 10N to the middle region of the frame blank.

[0221] In some embodiments, the border blank is a first border blank used to form the aforementioned first border portion 50. The weight reduction area of ​​the first border blank includes the end where the first surface 511 of the first segment 51 of the aforementioned first border portion 50 is located. The recess formed in step S34 is the aforementioned groove G1, and the formed border portion is the aforementioned first border portion 50. The radius of the third chamfer is equal to the radius of the arc between the sidewall and bottom wall of the groove G1.

[0222] When the groove G1 includes the aforementioned nine sub-grooves G11, the sixth target structural parameter includes nine first sub-target structural parameters. Each first sub-target structural parameter includes the ratio of the length of the corresponding sub-grooves G11 to the aforementioned sixth distance S6, the ratio of the width of the sub-grooves G11 to the aforementioned fifth distance S5, the ratio of the vertical distance from the center position C5 of the sub-grooves G11 to the aforementioned fifth surface 515 to the sixth distance S6, the ratio of the vertical distance from the center position C5 of the sub-grooves G11 to the aforementioned fourth surface 514 to the fifth distance S5, and the vertical distance from the bottom wall of the sub-grooves G11 to the aforementioned second surface 512.

[0223] In other embodiments, the border blank is a second border blank used to form the aforementioned second border portion 60. The weight reduction area of ​​the second border blank includes one end where the second surface 612 of the second segment 61 of the aforementioned second border portion 60 is located. The recess formed in step S34 is the aforementioned recess G2, and the formed border portion is the aforementioned second border portion 60. The radius of the third chamfer is equal to the radius of the arc between two adjacent sidewalls of the aforementioned recess G2.

[0224] When the recess G2 includes the aforementioned eight sub-recesses G12, the sixth target structural parameter includes eight second sub-target structural parameters. Each second sub-target structural parameter includes the ratio of the length of the corresponding sub-recess G12 to the aforementioned eighth distance S8, the ratio of the width of the sub-recess G12 to the aforementioned seventh distance S7, the ratio of the vertical distance from the center position C6 of the sub-recess G12 to the aforementioned fifth surface 615 to the eighth distance S8, the ratio of the vertical distance from the center position C6 of the sub-recess G12 to the aforementioned third surface 613 to the seventh distance S7, and the vertical distance from the bottom wall of the sub-recess G12 to the aforementioned second surface 612.

[0225] In some embodiments, step S33, "determining the sixth target structural parameter based on the weight reduction area of ​​the frame blank, the third process parameters of the third drilling tool, the target performance of the frame, the target weight reduction rate of the frame, and the third test conditions," includes: S331: Determine the depth of the recess according to the dimensions of the frame blank.

[0226] S332: Determine the area of ​​the recess based on the target weight reduction rate of the frame portion and the depth of the recess.

[0227] S333: Select a plurality of first slotted areas on the weight reduction area of ​​the frame blank, wherein the area of ​​each first slotted area is equal to the area of ​​the recess.

[0228] S334: Simulate grooving for any first grooving area, and after grooving, perform displacement simulation test on the frame blank under the third test conditions to calculate the corresponding sixth displacement, thereby obtaining multiple sixth displacements.

[0229] S335: Take the first slotted area corresponding to the minimum sixth displacement as the target first slotted area.

[0230] S336: Simulate slotting in the first slotted area of ​​the target, and perform a stiffness simulation test on the frame blank after the simulated slotting to calculate the stiffness loss value.

[0231] S337: When the calculated stiffness loss value of the frame blank is less than the preset stiffness loss value, the structural parameters of the first target slotted area are used as the sixth target structural parameters of the recess.

[0232] In some embodiments, the border portion blank is a first border portion blank, and determining the depth of the recess based on the dimensions of the border portion blank includes determining the depth of the groove G1 based on the dimensions of the border portion blank along the arrangement direction of the first surface 511 and the second surface 512. In some embodiments, each first slotted area includes nine first sub-slotted areas, and each first sub-slotted area is used to form a sub-groove G11.

[0233] In other embodiments, the border portion blank is a second border portion blank, and determining the depth of the recess based on the dimensions of the border portion blank includes determining the depth of the recess G2 based on the dimensions of the second border portion blank along the arrangement direction of the first surface 611 and the second surface 612. In some embodiments, each first slotted area includes nine second sub-slotted areas, and each second sub-slotted area is used to form a sub-recess G21.

[0234] In some embodiments, steps S331 to S337 can be executed using a preset model.

[0235] Compared to the absence of grooves G1 and G2, the first segment 51 of the first frame portion 50 and the second segment 61 of the second frame portion 60 provided in this application embodiment have a stiffness loss of 10% and a weight reduction rate of 13.4%.

[0236] The first and second border blanks can be an integral structure or a separate structure.

[0237] In some embodiments, the manufacturing method includes the steps of: S41: Provides a third border blank and a second border blank.

[0238] S42: Determine the area to be weight-reduced in the third frame blank.

[0239] S43: Based on the weight reduction area of ​​the third frame blank, the fourth process parameters of the fourth hole tool, the target performance of the assembly of the third frame 30 and the second frame 70, the target weight reduction rate of the assembly of the third frame 30 and the second frame 70, and the fourth test conditions, determine the seventh target structural parameter and the eighth target structural parameter.

[0240] S44: Based on the seventh target structural parameters, the second frame blank is processed to form the aforementioned protrusion 71, thereby obtaining the aforementioned second frame 70.

[0241] S45: Based on the eighth target structural parameters, the fourth hole-making tool is used to make a hole in the third frame blank to form the aforementioned groove G3, thereby obtaining the aforementioned third frame 30.

[0242] The assembly of the third frame 30 and the second frame 70 can be obtained by embedding the protrusion 71 of the second frame 70 into the groove G3 of the third frame 30.

[0243] Step S44 can be performed by CNC (Computer Numerical Control) machining of the second frame blank.

[0244] The seventh and eighth target structural parameters determined in step S43 enable the protrusion 71 to be embedded in the groove G3.

[0245] The fourth process parameter includes the fourth chamfer radius of the fourth opening tool. The fourth chamfer radius is equal to the radius of the arc between the bottom wall and the side wall of the aforementioned groove G3.

[0246] The target performance of the assembly of the third frame 30 and the second frame 70 includes a stiffness loss value that is less than the preset stiffness loss value.

[0247] The target weight reduction rate of the assembly of the third frame 30 and the second frame 70 is greater than 10%, or it can be other values.

[0248] The fourth test condition includes fixing the opposite ends of the assembly of the third and second frame blanks and applying a downward pressure of 10N to the assembly of the third and second frame blanks.

[0249] In some embodiments, the seventh target structural parameter includes the thickness, width, and ratio of the vertical distance from the center position of the aforementioned protrusion 71 to the edge of the inner sidewall 301 of the third frame 30 to the dimension of the inner sidewall 301 of the third frame 30 along the normal direction of the surface of the first plate 10.

[0250] In some embodiments, step S43, "determining the seventh and eighth target structural parameters based on the weight reduction area of ​​the third frame blank, the fourth process parameters of the fourth hole-making tool, the target performance of the assembly of the third frame 30 and the second frame 70, the target weight reduction rate of the assembly of the third frame 30 and the second frame 70, and the fourth test conditions," includes: S431: Determine the depth of the groove G3 based on the dimensions of the third frame blank.

[0251] S432: Based on the target weight reduction rate of the assembly of the third frame 30 and the second frame 70, and the depth of the groove G3, determine the area of ​​the groove G3 and the area of ​​the protrusion 71. The area refers to the area projected along the Y direction or X direction.

[0252] S433: Select multiple second slotting areas on the weight reduction area of ​​the third frame blank, and select multiple protrusion processing areas on the second frame blank, wherein the area of ​​each second slotting area and the area of ​​each protrusion processing area are equal to the area of ​​the groove G3 and the area of ​​the protrusion 71.

[0253] S434: Simulate grooving for any second slotted area and simulate machining for any protrusion machining area. Then, under the fourth test conditions, perform displacement simulation tests on the assembly of the third frame blank and the second frame blank to calculate the corresponding seventh displacement, thereby obtaining multiple seventh displacements.

[0254] S435: Take the second slotted area corresponding to the minimum seventh displacement as the target second slotted area, and take the protrusion machining area corresponding to the minimum seventh displacement as the target protrusion machining area.

[0255] S436: Simulate slotting in the second slotted area of ​​the target and simulate machining in the convex machining area of ​​the target. Then, perform stiffness simulation test on the assembly of the third frame blank and the second frame blank to calculate the stiffness loss value.

[0256] S437: When the calculated stiffness loss value is less than the preset stiffness loss value, the structural parameters of the target second slotted area are taken as the eighth target structural parameters of the groove G3, and the structural parameters of the target protrusion processing area are taken as the seventh target structural parameters of the protrusion 71.

[0257] In some embodiments, steps S431 to S437 can be executed using a preset model.

[0258] Compared to the assembly with no groove G3 and no protrusion 71 provided in this application embodiment, the stiffness loss of the second frame 70 and the third frame 30 is 8.5%, and the weight reduction rate is 11.6%.

[0259] It should be noted that the fabrication of the middle frame 400 may include other existing processing steps, which are not detailed in this embodiment. Additionally, the assembly of the electronic device 500 may include the installation of other functional components, such as circuit boards, camera assemblies, heat dissipation assemblies, displays, and fingerprint components, which are not specifically described in this embodiment.

[0260] It should be noted that the preparation method of the middle frame 400 corresponds to that of the aforementioned middle frame 400. Preparation steps not described in the preparation method can be obtained by referring to the processes in related technologies based on the structure of the aforementioned middle frame 400. For a more detailed description, please refer to the contents of the various embodiments of the aforementioned middle frame 400. The manufacturing method of the middle frame 400 and the contents of the aforementioned middle frame 400 can also be referred to each other.

[0261] The above are the implementation methods of the embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the embodiments of this application, and these improvements and modifications are also considered to be within the protection scope of this application.

Claims

1. A middle frame, characterized in that, The middle frame includes: The middle plate includes a first plate body, the first plate body includes a first bearing area and a second bearing area, the first bearing area is used to support at least a first circuit board, the second bearing area is used to support at least a second circuit board, the first bearing area is provided with a first through hole and a second through hole spaced apart, and the second bearing area is provided with a third through hole. A frame, the frame being connected to at least a portion of the periphery of the middle plate; Wherein, the first projection of the middle frame along the direction perpendicular to the first plate is rectangular, and the periphery of the first plate includes a first edge, a second edge, a third edge and a fourth edge connected in sequence. The first edge and the third edge are parallel to the width direction of the first projection, and the second edge and the fourth edge are parallel to the length direction of the first projection. The fourth edge is closer to the first bearing area than the second edge, and the second edge is closer to the second bearing area than the fourth edge. The vertical distance from the first edge to the third edge is the first distance, and the vertical distance from the second edge to the fourth edge is the second distance. The ratios of the dimensions of the first through hole, the second through hole, and the third through hole along the width direction of the first projection to the second distance are 0.14~0.22, 0.15~0.23, and 0.11~0.17, respectively. The ratios of the dimensions of the first through hole, the second through hole, and the third through hole along the length of the first projection to the first distance are 0.16~0.24, 0.25~0.38, and 0.32~0.5, respectively. The ratios of the vertical distances from the center positions of the first through hole, the second through hole, and the third through hole to the first edge to the first distance are 0.29~0.43, 0.64~0.97, and 0.55~0.82, respectively. The ratios of the vertical distances from the center positions of the first through hole, the second through hole, and the third through hole to the fourth edge to the second distance are 0.14~0.22, 0.46~0.7, and 0.68~1.02, respectively.

2. The middle frame according to claim 1, characterized in that, The area of ​​the first bearing area is larger than the area of ​​the second bearing area.

3. The middle frame according to claim 1, characterized in that, The first through hole, the second through hole, and the third through hole are all rectangular holes. The adjacent two holes of each through hole are connected by a circular arc transition. The ratio of the radius of the circular arc to the second distance is 0.024~0.

069.

4. The middle frame according to claim 1, characterized in that, The dimensions of the first through hole, the second through hole, and the third through hole along the width direction of the first projection are 4.7mm~7.1mm, 4.4mm~6.6mm, and 3.3mm~5mm, respectively; and the dimensions of the first through hole, the second through hole, and the third through hole along the length direction of the first projection are 5mm~7.6mm, 8.8mm~13.5mm, and 11.4mm~17.2mm, respectively. The vertical distances from the center of the first through hole, the center of the second through hole, and the center of the third through hole to the first edge are 10mm~15mm, 22mm~34mm, and 19mm~29mm, respectively. The vertical distances from the center of the first through hole, the center of the second through hole, and the center of the third through hole to the fourth edge are 4mm~6.2mm, 13.3mm~21mm, and 19mm~30mm, respectively.

5. The middle frame according to any one of claims 1-4, characterized in that, The frame includes a first frame segment with mounting holes for mounting button components. The middle frame also includes a side plate located near the first frame segment and parallel to it. The side plate includes opposing first and second side plate surfaces, as well as opposing third and fourth side plate surfaces. The first side plate surface faces the first frame segment, while the second side plate surface faces away from it and supports a third circuit board. The third and fourth side plate surfaces are arranged perpendicular to the surface of the first plate. The third side plate surface is further away from the plane of the first plate than the fourth side plate surface, and a blind hole is provided at one end of the third side plate surface.

6. The middle frame according to claim 5, characterized in that, The side panel also includes a fifth side panel surface and a sixth side panel surface facing away from each other. The projection of the fifth side panel surface onto one side of the first panel body is located inside the first panel body, and the projection of the sixth side panel surface onto one side of the first panel body is located outside the first panel body. Alternatively, the projections of both the fifth and sixth side panel surfaces onto one side of the first panel body are located outside the first panel body, and the projection of the fifth side panel surface onto one side of the first panel body is closer to the first panel body than the projection of the sixth side panel surface onto one side of the first panel body. The vertical distance from the fifth side panel surface to the sixth side panel surface is a third distance, and the vertical distance from the first side panel surface to the second side panel surface is a fourth distance. The blind hole includes a first sub-blind hole and a second sub-blind hole spaced apart along the arrangement direction of the fifth side plate surface and the sixth side plate surface. The ratio of the size of the first sub-blind hole and the second sub-blind hole along the arrangement direction of the fifth side plate surface and the sixth side plate surface to the third distance is 0.18~0.29 and 0.46~0.7, respectively. The ratio of the size of the first sub-blind hole and the second sub-blind hole along the arrangement direction of the first side plate surface and the second side plate surface to the fourth distance is 0.5~0.75 and 0.17~0.26, respectively. The vertical distance from the bottom wall of the first sub-blind hole to the surface of the second side plate is greater than or equal to 0.2 mm, and the vertical distance from the bottom wall of the second sub-blind hole to the surface of the second side plate is greater than or equal to 0.2 mm.

7. The middle frame according to claim 6, characterized in that, The ratio of the vertical distance from the center of the first sub-blind hole to the surface of the first side plate to the fourth distance is 0.45~0.7; the ratio of the vertical distance from the center of the first sub-blind hole to the surface of the fifth side plate to the third distance is 0.19~0.29; the ratio of the vertical distance from the center of the second sub-blind hole to the surface of the first side plate to the fourth distance is 0.5~0.75; and the ratio of the vertical distance from the center of the second sub-blind hole to the surface of the fifth side plate to the third distance is 0.6~0.

91.

8. The middle frame according to claim 6, characterized in that, The adjacent walls of the blind hole are connected by a circular arc transition, and the ratio of the radius of the circular arc to the fourth distance is 0.14 to 0.

4.

9. The middle frame according to claim 6, characterized in that, The dimensions of the first sub-blind hole and the second sub-blind hole along the arrangement direction of the fifth side plate surface and the sixth side plate surface are 2.48mm~3.75mm and 2.3mm~3.5mm, respectively; the dimensions of the first sub-blind hole and the second sub-blind hole along the arrangement direction of the first side plate surface and the second side plate surface are 7.1mm~10.7mm and 6.5mm~9.85mm, respectively. The vertical distances from the center of the first sub-blind hole and the center of the second sub-blind hole to the surface of the first side plate are 2.3mm~3.5mm and 2.45mm~3.75mm, respectively. The vertical distances from the center of the first sub-blind hole and the center of the second sub-blind hole to the surface of the fifth side plate are 7.3mm~11mm and 23mm~35mm, respectively.

10. The middle frame according to any one of claims 1-4, characterized in that, The frame includes a first frame, which includes a first frame portion. The first frame portion includes an outer side and an inner side facing away from each other. The outer side and the inner side are arranged in a direction parallel to the surface of the first plate. The inner side is closer to the middle plate than the outer side. A groove is formed at one end of the inner side.

11. The middle frame according to claim 10, characterized in that, The middle frame has a rectangular shape in the first projection along the direction perpendicular to the first plate. The first frame portion includes a first segment, which includes a first and a second side facing away from each other, a third and a fourth side facing away from each other, and a fifth and a sixth side facing away from each other. The inner side includes the first side, and the outer side includes the second side. A groove is provided at one end where the first side is located. The arrangement direction of the fifth and sixth sides is parallel to the length direction of the first projection. The third side is farther away from the display screen than the fourth side, and the fifth side is farther away from the first plate than the sixth side. The vertical distance from the third side to the fourth side is the fifth distance, and the vertical distance from the fifth side to the sixth side is the sixth distance. The groove includes nine sub-grooves spaced apart along the arrangement directions of the fifth and sixth surfaces. The ratios of the dimensions of the nine sub-grooves along the arrangement directions of the fifth and sixth surfaces to the sixth distance are 0.028~0.043, 0.028~0.042, 0.028~0.042, 0.028~0.042, 0.028~0.042, 0.021~0.032, 0.021~0.032, 0.019~0.030, and 0.021~0.032, respectively. The ratios of the dimensions of the nine sub-grooves along the arrangement directions of the third and fourth surfaces to the fifth distance are all values ​​within the range of 0.49 to 0.

75. The vertical distance from the bottom wall of each of the nine sub-grooves to the second surface is greater than or equal to 0.4 mm.

12. The middle frame according to claim 11, characterized in that, The ratios of the vertical distances from the center of the nine sub-grooves to the fifth surface to the sixth distance are 0.06~0.1, 0.15~0.22, 0.18~0.27, 0.21~0.32, 0.24~0.36, 0.27~0.4, 0.32~0.48, 0.51~0.78, and 0.73~1.1, respectively. The ratios of the vertical distances from the center of the nine sub-grooves to the fourth surface to the fifth distance are all values ​​within the range of 0.38~0.

58.

13. The middle frame according to claim 11, characterized in that, The sidewalls and bottomwalls of the groove are connected by a circular arc transition, and the ratio of the radius of the circular arc to the sixth distance is greater than or equal to 0.

69.

14. The middle frame according to claim 11, characterized in that, The dimensions of the nine sub-grooves along the arrangement directions of the fifth and sixth surfaces are 3.3mm~5mm, 3.3mm~5mm, 3.3mm~5mm, 3.3mm~5mm, 3.3mm~5mm, 2.56mm~3.84mm, 2.56mm~3.84mm, 2.3mm~3.5mm, and 2.56mm~3.84mm, respectively; and the dimensions of the nine sub-grooves along the arrangement directions of the third and fourth surfaces are all 1.4mm~2.2mm. The vertical distances from the center of each of the nine sub-grooves to the fifth surface are 7.6mm~11.4mm, 17.6mm~26.4mm, 21mm~32mm, 24.8mm~37.3mm, 28.5mm~42.7mm, 31.7mm~47.5mm, 37.6mm~56.4mm, 60.9mm~91.3mm, and 86.2mm~129.4mm, respectively. The vertical distances from the center of each of the nine sub-grooves to the fourth surface are all 1.12mm~1.68mm.

15. The middle frame according to claim 10, characterized in that, The first frame also includes a second frame portion, which is connected between the inner side of the first frame portion and the middle plate. The second frame portion includes a support surface for supporting the display screen, and a recess is provided at one end of the second frame portion away from the surface of the display screen.

16. The middle frame according to claim 15, characterized in that, The middle frame has a rectangular shape in the first projection along the direction perpendicular to the first plate. The second frame includes a second segment, which includes a first and a second surface facing away from each other, a third and a fourth surface facing away from each other, and a fifth and a sixth surface facing away from each other. The bearing surface includes the second surface. The recess is formed at one end where the first surface is located. The arrangement direction of the fifth and sixth surfaces is parallel to the length direction of the first projection. The third surface is farther away from the middle plate than the fourth surface. The fifth surface is farther away from the first plate than the sixth surface. The vertical distance from the third surface to the fourth surface is the seventh distance. The vertical distance from the fifth surface to the sixth surface is the eighth distance. The recess includes eight sub-recesses spaced apart along the arrangement directions of the fifth and sixth surfaces. The ratios of the dimensions of the eight sub-recesses along the arrangement directions of the fifth and sixth surfaces to the eighth distance are 0.012~0.018, 0.012~0.018, 0.03~0.05, 0.12~0.18, 0.025~0.038, 0.014~0.02, and 0.014~0. 02, 0.026~0.04, the ratios of the dimensions of the eight sub-recesses along the arrangement directions of the third and fourth surfaces to the seventh distance are 0.312~0.468, 0.312~0.468, 0.312~0.468, 0.312~0.468, 0.312~0.468, 0.312~0.468, 0.312~0.468, 0.312~0.468; The vertical distance from the bottom wall of the eight sub-recesses to the second surface is greater than or equal to 0.2 mm.

17. The middle frame according to claim 16, characterized in that, The ratios of the vertical distances from the center of the eight sub-recesses to the fifth surface to the eighth distance are 0.016~0.025, 0.062~0.092, 0.09~0.14, 0.15~0.23, 0.28~0.42, 0.3~0.46, 0.34~0.52, and 0.37~0.56, respectively. The ratios of the vertical distances from the center of the eight sub-recesses to the third surface to the seventh distance are all values ​​within the range of 0.49~0.

74.

18. The middle frame according to claim 16, characterized in that, The two adjacent sidewalls of the recess are connected by a circular arc transition, and the ratio of the radius of the circular arc to the eighth distance is 0.16~0.

44.

19. The middle frame according to claim 16, characterized in that, The dimensions of the eight sub-recesses along the arrangement directions of the fifth and sixth surfaces are 0.84mm~2.16mm, 0.84mm~2.16mm, 3.92mm~5.88mm, 14.5mm~21.7mm, 2.96mm~4.44mm, 1.6mm~2.4mm, 1.68mm~2.52mm, and 3.12mm~4.68mm, respectively. The dimensions of the eight sub-recesses along the arrangement directions of the third and fourth surfaces are 1.4mm~2.1mm, 1.4mm~2.1mm, 1.4mm~2.1mm, 1.12mm~1.68mm, 1.4mm~2.1mm, 1.4mm~2.1mm, 1.4mm~2.1mm, and 1.4mm~2.1mm, respectively. The vertical distances from the center of each of the eight sub-recesses to the fifth surface are 2mm~3mm, 7.3mm~11mm, 11mm~16.4mm, 18.2mm~27.4mm, 33mm~50mm, 36mm~54mm, 41mm~62mm, and 44mm~66mm, respectively. The vertical distances from the center of each of the eight sub-recesses to the fourth surface are all 2.2mm~3.4mm.

20. The middle frame according to any one of claims 1-4, characterized in that, The frame includes a second frame and a third frame. The material of the third frame has a higher density than the material of the second frame. The inner wall of the third frame facing the second frame has a groove. The second frame includes a protrusion embedded in the groove.

21. The middle frame according to claim 20, characterized in that, The third frame includes an inner sidewall and an outer sidewall facing away from each other. The inner sidewall of the third frame is closer to the second frame than the outer sidewall. The ratio of the size of the protrusion to that of the third frame along the arrangement direction of the inner and outer sidewalls is 0.66 to 1.

0. The ratio of the size of the protrusion to that of the third frame along the normal direction of the surface of the first plate is 0.73 to 1.

1.

22. The middle frame according to claim 20, characterized in that, The ratio of the vertical distance from the center of the protrusion to the edge of the inner wall of the third frame to the normal dimension of the inner wall of the third frame along the surface of the first plate is 0.4 to 0.

6.

23. The middle frame according to claim 20, characterized in that, The bottom wall and side wall of the trough are connected by an arc transition, and the ratio of the radius of the arc to the dimension of the third frame along the arrangement direction of the inner and outer side walls is 0.58~1.

67.

24. The middle frame according to claim 20, characterized in that, The dimension of the protrusion along the arrangement direction of the inner and outer sidewalls is 0.8mm~1.2mm, the dimension of the protrusion along the normal direction of the first plate is 1.6mm~2.4mm, and the vertical distance from the center of the protrusion to the edge of the inner sidewall of the third frame is 0.88mm~1.32mm.

25. An electronic device, characterized in that, The electronic device includes a mid-frame as described in any one of claims 1-24.

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