An electronic device

Abstract

The application provides an electronic device. The electronic device comprises a display screen, a back shell and a frame, and the display screen and the back shell are arranged on the top surface and the bottom surface of the frame respectively. The bottom surface of the frame is provided with an extension part and a transition part, and the transition part is connected with the extension part. The bottom surface of the frame comprises a back shell mounting surface, the extension part surrounds the back shell mounting surface, and the transition part is connected with the back shell mounting surface. When the above structure is adopted, the sealing effectiveness between the frame and the clamp during the detection of the glue line air tightness is improved, and the problem of false detection of the glue line air tightness caused by the existence of the section difference of the heterogeneous bonding section is solved.

Description

[0001] This application is a divisional application. The application number of the original application is 202011380630.8, the original application date is November 30, 2020, and the name of the original application is "A kind of electronic device frame". The entire content of the original application is incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of consumer electronics technology, and in particular to an electronic device. Background Art

[0003] Smart terminal products primarily use methods such as dispensing glue or adhesive backing to form a glue line between the display and the frame, achieving bonding and sealing between the display and the frame. To ensure a continuous, break-free glue line and zero risk of liquid intrusion, the glue line requires airtightness testing. This airtightness test requires the frame to which the display is bonded to be combined with a fixture to form a sealed space, effectively sealing any existing openings in the frame with the fixture. The surface of the frame that contacts the fixture for sealing is typically the backplane (BP) surface, also known as the backshell mounting surface or backshell bonding surface. For metal frames, the BP surface typically consists of both a metal and plastic surface. The junction of the plastic and metal, known as the heterogeneous junction, exhibits a height difference, commonly referred to as a step. This step makes it difficult for the fixture to form an effective seal between the frame and the frame. To ensure the effective sealing between the frame and the fixture, the current approach is to eliminate the step. This is typically accomplished by machining the BP surface into a fully CNC (Computerized Numerical Control) machined surface or a fully plastic surface. However, machining a full CNC surface requires smoothing or reducing each step, which is time-consuming and costly. Machining a full plastic surface requires increasing the thickness of the plastic, which increases the overall thickness of the machine, limiting the flexibility of frame material selection and structural design. Reducing the thickness of the metal material will reduce the structural strength of the frame. Summary of the Invention

[0004] The present application provides an electronic device to improve the sealing effectiveness between a frame and a clamp during glue line air tightness testing.

[0005] In the first aspect, the present application provides an electronic device, comprising: a frame, the top surface of the frame is used to mount a display screen, the bottom surface is used to mount a back shell, and the back shell is connected to the frame through a back shell mounting surface on the bottom surface of the frame, and a continuous extension portion is provided around the outer edge of the bottom surface of the frame, and the extension portion surrounds the back shell mounting surface; a transition portion, the transition portion is arranged on the bottom surface of the frame, the transition portion is located between the back shell mounting surface and the extension portion, and is connected to the back shell mounting surface.

[0006] The technical solution provided by the present application is a transition part that changes the sealing path between the clamp and the mounting surface of the rear shell of the frame, so that the sealing path does not pass through the heterogeneous bonding section on the mounting surface of the rear shell, and the sealing path transitions from the mounting surface of the rear shell to the extension part, thereby avoiding the influence of the step difference of the heterogeneous bonding section on the sealing effectiveness during the air tightness test, forming a continuous sealing surface without breakpoints between the clamp and the frame, and avoiding the mismeasurement of the air tightness of the glue line. In addition to solving the problem of mismeasurement of the air tightness of the glue line due to the step difference of the heterogeneous bonding section, it can also solve the problem of mismeasurement of the air tightness of the glue line due to the roughness and microcracks of the mounting surface of the rear shell. Compared with the prior art of processing the mounting surface of the rear shell into a full CNC surface, the working time is short and the cost is low. Compared with processing the mounting surface of the rear shell into a full plastic surface, it will not affect the structural strength of the frame, nor will it limit the material selection and structural design flexibility of the frame.

[0007] In one specific embodiment, the transition portion is located adjacent to the heterogeneous bonding section on the rear shell mounting surface along the circumference of the frame, and there are multiple transition portions, with each heterogeneous bonding section having transition portions on both sides of the frame. Due to the transition portions on both sides of the heterogeneous bonding section, the sealing path in the area where the heterogeneous bonding section is located becomes "rear shell mounting surface - transition portion on one side of the heterogeneous bonding section - extension portion - transition portion on the other side of the heterogeneous bonding section - rear shell mounting surface," forming a continuous, seamless sealing surface between the fixture and the frame, thereby minimizing the impact of the step difference of the heterogeneous bonding section on the sealing effectiveness during airtightness testing.

[0008] In a specific embodiment, the transition portion is linear or curved, adapted to the shape of the frame edge, and does not affect the installation of the rear housing.

[0009] When the transition portion is specifically provided, the length of the transition portion may be, but is not limited to, greater than or equal to 0.8 mm, to ensure that the transition portion can stably play a role in changing the sealing path.

[0010] In one specific embodiment, the transition portion faces the plastic surface area of ​​the rear housing mounting surface in a direction perpendicular to the frame circumference. The plastic surface on the rear housing mounting surface is typically higher than the metal surface. The transition portion corresponds to the plastic surface area, ensuring that the sealing path effectively avoids the heterogeneous bonding section. The transition portion is connected to the rear housing mounting surface, and the transition portion's corresponding plastic surface area facilitates integral molding with the plastic surface through injection molding.

[0011] In a specific possible implementation scheme, the transition portion extends along the circumference of the frame, and the transition portion covers all the heterogeneous bonding sections on the rear shell mounting surface in the circumference of the frame. When the transition portion is a complete annular structure, the sealing path of the area where the heterogeneous bonding section is located is entirely on the transition portion. When the transition portion is an annular structure with an opening, the sealing path of the area where the heterogeneous bonding section is located becomes "transition portion-extension portion (corresponding to the transition portion opening)-transition portion". Since the transition portion covers all the heterogeneous bonding sections on the rear shell mounting surface, the transition portions of both structures can avoid the impact of the step difference of the heterogeneous bonding section on the sealing effectiveness during the airtightness test, forming a continuous and non-breakpoint sealing surface between the clamp and the frame, avoiding mismeasurement of the airtightness of the glue line.

[0012] In a specific embodiment, the surface of the transition portion extending from the rear housing mounting surface toward the extension portion is an arc surface, so that the transition portion fits more tightly with the fixture and the sealing reliability is higher.

[0013] When the transition portion is specifically provided, the radius of the arc surface may be, but is not limited to, greater than or equal to 0.4 mm, to ensure that the transition portion can stably change the sealing path.

[0014] In a specific embodiment, the transition portion is made of plastic, so as to be easily integrated with the plastic surface on the rear housing mounting surface by injection molding.

[0015] In the second aspect, the present application provides an electronic device, comprising: a frame, the top surface of the frame is used to install a display screen, the bottom surface is used to install a back shell, and the back shell is connected to the frame through the back shell mounting surface on the bottom surface of the frame, and the outer edge of the bottom surface of the frame has a continuous extension portion, and the extension portion surrounds the back shell mounting surface; a transition portion, the transition portion is arranged on the bottom surface of the frame, and the transition portion is arranged on the extension portion, and the transition portion extends along the circumference of the extension portion to form a closed-loop structure.

[0016] The technical solution provided by this application uses a transition portion to alter the sealing path between the clamp and the frame, eliminating the need to pass through the rear shell mounting surface and, more importantly, the heterogeneous bonding section on the rear shell mounting surface. Due to the transition portion's closed-loop structure, the sealing path between the clamp and the frame is completely located on the extension portion. Since the transition portion forms a closed-loop structure on the extension portion, it covers the entire heterogeneous bonding section on the rear shell mounting surface. This can mitigate the impact of step differences in the heterogeneous bonding section on the sealing effectiveness during airtightness testing, forming a continuous, seamless sealing surface between the clamp and the frame and preventing mismeasurements of the glue line's airtightness. Similarly, in addition to resolving the issue of mismeasurements of the glue line's airtightness caused by step differences in the heterogeneous bonding section, it can also address mismeasurements of the glue line's airtightness caused by roughness or microcracks on the rear shell mounting surface. Compared to existing technologies, this solution also offers the advantages of reduced labor and cost. Furthermore, due to the narrow width of the extension portion, the transition portion, when located on the extension portion, does not excessively occupy the frame's metal structural space, significantly impacting the frame's structural strength, or limiting the flexibility of the frame's material selection and structural design.

[0017] In a specific embodiment, the transition portion is made of plastic, so as to be easily integrated with the plastic surface on the rear housing mounting surface by injection molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the connection between a display screen and a frame in the prior art;

[0019] Figure 2 A schematic diagram of the coordination between the clamp and the frame in the prior art;

[0020] Figure 3 It is a structural diagram of a framework in the prior art;

[0021] Figure 4 A schematic diagram of a portion of the structure of an electronic device provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of a portion of the structure of an electronic device provided in an embodiment of the present application;

[0023] Figure 6 A schematic structural diagram of a transition portion of an electronic device frame provided in an embodiment of the present application;

[0024] Figure 7 A schematic structural diagram of a transition portion of an electronic device frame provided in an embodiment of the present application;

[0025] Figure 8 A schematic diagram of the sealing path for the electronic device frame and the fixture provided in an embodiment of the present application;

[0026] Figure 9A schematic diagram of another sealing path for cooperation between the electronic device frame and the clamp provided in an embodiment of the present application;

[0027] Figure 10 A schematic diagram of another sealing path for cooperation between the electronic device frame and the clamp provided in an embodiment of the present application;

[0028] Figure 11 A schematic structural diagram of a transition portion of an electronic device frame provided in an embodiment of the present application;

[0029] Figure 12 A schematic diagram of another sealing path for cooperation between the electronic device frame and the clamp provided in an embodiment of the present application;

[0030] Figure 13 A schematic diagram of the cooperation between the electronic device frame and the clamp provided in an embodiment of the present application.

[0031] Reference numerals:

[0032] 100-frame; 200-display screen; 300-glue line; 400-clamp; 500-extension portion; 600-transition portion; 110-rear shell mounting surface; 120-heterogeneous bonding section; 111-plastic surface; 112-metal surface. DETAILED DESCRIPTION

[0033] First, please refer to Figure 1 The display screen 200 of the smart terminal product is usually bonded to the top surface of the body frame 100 by glue line 300, and the back cover is bonded to the bottom surface of the body frame 100. The smart terminal product can be a mobile phone, a watch, a tablet, etc. The glue line 300 needs to be tested for airtightness to ensure that the glue line 300 is bonded continuously without any breakpoints. When testing for airtightness, if Figure 2 As shown, the frame 100 bonded with the display screen 200 cooperates with the clamp 400 to form a closed space A. A certain air pressure (positive pressure or negative pressure) is applied to the closed space A through the equipment. After the air pressure stabilizes to a certain value, the pressure is maintained for a period of time, such as 5-10 seconds, to detect the air pressure change in the closed space A, determine whether there is leakage in the glue line 300, and identify defects in the glue line 300.

[0034] The bottom surface of the frame 100 has a rear shell mounting surface 110, which is usually distributed along the circumference of the frame 100. The rear shell is connected to the frame 100 through the rear shell mounting surface 110. During the airtightness test, the rear shell mounting surface 110 serves as the contact and mating surface between the frame 100 and the clamp 400. The part of the clamp 400 that contacts the frame 100, that is, the sealing ring, is made of a flexible material. After the clamp 400 is clamped, it fits tightly to the frame 100. Figure 3As shown, the rear housing mounting surface 110 typically consists of both a plastic surface 111 and a metal surface 112. The junction of the two materials, known as the heterogeneous junction section 120, has a height difference, commonly referred to as a step. During airtightness testing, this step can easily cause leakage from the rear housing mounting surface 110, leading to seal failure between the frame 100 and the fixture 400, and causing pressure fluctuations within the enclosed space A, resulting in false airtightness test results.

[0035] The embodiment of the present application provides an electronic device to improve the sealing effectiveness between the frame 100 and the clamp 400 during the airtightness test of the glue line 300. The electronic device provided by the present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] The electronic device includes a frame 100 and a transition portion 600 , as well as a display screen 200 and a rear cover. The display screen 200 and the rear cover are respectively arranged on the top surface and the bottom surface of the frame 100 .

[0037] refer to Figure 4 , Figure 4 This is a partial structural diagram of the electronic device provided in the embodiment of the present application. Figure 4 As shown, the outer edge of the bottom surface of the frame 100 has a continuous extension 500 around it, and the extension 500 surrounds the rear shell installation surface 110. After the rear shell is installed, the rear shell is located within the range of the extension 500, and the extension 500 can play a certain protective role on the rear shell.

[0038] Continue to refer Figure 5 and Figure 6 , Figure 5 This is a partial structural diagram of an electronic device provided in an embodiment of the present application. Figure 6 This is a schematic diagram of the structure of the transition portion of the electronic device frame provided in an embodiment of the present application. Figure 5 and Figure 6 As shown, the transition portion 600 is disposed on the bottom surface of the frame 100 . The transition portion 600 is located between the rear housing mounting surface 110 and the extension portion 500 , and is connected to the rear housing mounting surface 110 .

[0039] In one possible embodiment, the transition portion 600 is located circumferentially of the frame 100 near the heterogeneous joining section 120 on the rear housing mounting surface 110, i.e., the junction of surfaces of different materials on the rear housing mounting surface 110. There are multiple transition portions 600, with each heterogeneous joining section 120 being provided with a transition portion 600 on both sides of the frame 100 circumferentially. In other words, the heterogeneous joining section 120 is sandwiched between two adjacent transition portions 600.

[0040] In practice, heterojunction sections 120 with large step differences, such as those at the side key locations of frame 100, require transition sections 600 on both sides. This is because heterojunction sections 120 with large step differences can significantly impact the airtightness testing of the adhesive line 300, potentially causing seal failure. The step difference of heterojunction sections 120 can be determined through actual measurement, a method well-established and omitted for further detail.

[0041] Continue to refer Figure 7 , Figure 7 This is a schematic diagram of the structure of the transition portion of the electronic device frame provided in an embodiment of the present application. Figure 7 As shown, when the clamp 400 contacts and cooperates with the frame 100 , the transition portion 600 squeezes the clamp 400 , changes the sealing path between the frame 100 and the clamp 400 , and transitions the sealing path to an area with no step difference or a small step difference.

[0042] For reference Figure 8 , Figure 8 Schematic diagram of the sealing path of the electronic device frame and the clamp provided in the embodiment of the present application. Figure 8 As shown, the two adjacent transition portions 600 sandwich the heterogeneous bonding section 120 in the middle, so that the sealing path no longer passes through the heterogeneous bonding section 120, but passes through the extension portion 500. The dotted line in the figure indicates the sealing path. The sealing path in the heterogeneous bonding section 120 area becomes "back shell mounting surface 110-transition portion 600 on one side of the heterogeneous bonding section 120-extension portion 500-transition portion 600 on the other side of the heterogeneous bonding section 120-back shell mounting surface 110", avoiding the influence of the step difference of the heterogeneous bonding section 120 on the sealing effectiveness, forming a continuous sealing surface without breakpoints, and avoiding mismeasurement of the airtightness of the glue line 300. Furthermore, it can also solve the problem of mismeasurement of the airtightness of the glue line 300 caused by the roughness and microcracks of the back shell mounting surface 110. It should be noted that, Figure 8 Only the sealing path of the heterogeneous bonding section 120 area is shown, that is, only part of the sealing path is shown, and the sealing path of the remaining area without the heterogeneous bonding section 120 is still on the rear shell mounting surface 110.

[0043] When there are multiple heterogeneous bonding sections 120, each heterogeneous bonding section 120 is provided with transition portions 600 on both sides of the frame 100 in the circumferential direction, especially for heterogeneous bonding sections 120 with large step differences. This ensures that each heterogeneous bonding section 120 with large step differences does not affect the sealing effectiveness between the clamp and the frame 100.

[0044] When two heterogeneous bonding sections 120 are close together, a transition portion 600 may not be provided between the two heterogeneous bonding sections 120. Instead, transition portions 600 may be provided on both sides of the two heterogeneous bonding sections 120 as a whole, thereby sharing a pair of transition portions 600. Of course, when the locations where adjacent transition portions 600 should be provided are close to each other, they may be combined into one transition portion 600. For example, two heterogeneous bonding sections 120 may share a transition portion 600 located between them. Together with the transition portions 600 on each side, the two heterogeneous bonding sections 120 as a whole may use three transition portions 600.

[0045] The transition portion 600 changes the sealing path of the area where the heterogeneous combination section 120 is located. Under the joint action of multiple transition portions 600, the frame 100 and the clamp 400 form a continuous effective seal along the circumference of the frame 100.

[0046] The contact surface between the clamp 400 sealing ring and the frame 100 is contoured, meaning it is positioned in accordance with the position and shape of the rear housing mounting surface 110 and the transition portion 600. The sealing position corresponding to the extension portion 500 is designed to be flat, allowing the clamp 400 to fit tightly against the frame 100 and further ensuring the effectiveness of the seal between the clamp 400 and the frame 100. The aforementioned contact surface of the clamp 400 has zero interference with the rear housing mounting surface 110, the transition portion 600, and the remaining contacting portions of the frame 100, while having an interference of 0.1 mm with the extension portion 500. This interference represents the degree of interference between the clamp 400 and the frame 100, further ensuring a tight fit between the clamp 400 and the extension portion 500.

[0047] Regarding the extended shape of the transition portion 600, along the circumference of the frame 100, the transition portion 600 is linear when located on a straight edge of the frame 100, and is curved when located at a corner of the frame 100. The length of the transition portion 600 can be selected to be greater than or equal to 0.8 mm. When the transition portion 600 is linear, its length is the distance from one end to the other. When the transition portion 600 is curved, its length is the distance from one end to the other after straightening. For example, the length of the transition portion 600 can be 0.8 mm.

[0048] Regarding the position of the transition portion 600, it is located near the heterogeneous bonding section 120 on the rear housing mounting surface 110 along the circumference of the frame 100. Based on this, the transition portion 600 can face the plastic surface 111 area of ​​the rear housing mounting surface 110 in the vertical direction along the circumference of the frame 100. For a single transition portion 600, the entire transition portion 600 is located within the vertical outward extension of the plastic surface 111 area along the circumference of the frame 100.

[0049] In a possible embodiment, the transition portion 600 extends along the circumference of the frame 100 , and the transition portion 600 covers all the heterogeneous combining segments 120 on the rear housing mounting surface 110 in the circumference of the frame 100 .

[0050] In a specific implementation, the transition portion 600 may be a closed loop structure formed around the circumference of the frame 100 , and of course covers all the heterogeneous combination segments 120 in the circumferential direction of the frame 100 .

[0051] The transition portion 600 may also be an incomplete ring surrounding the circumference of the frame 100 , that is, a ring with an opening surrounding the circumference of the frame 100 , and the rear shell mounting surface 110 corresponding to the opening in the vertical direction of the circumference of the frame 100 does not have a heterogeneous bonding section 120 .

[0052] It can be understood that the first end of the transition portion 600 begins at one side of a heterogeneous bonding segment 120, and the second end surrounds the circumference of the frame 100. After covering all heterogeneous bonding segments 120 on the rear housing mounting surface 110 circumferentially of the frame 100, it may or may not be connected to the first end. The transition portion 600 of this embodiment covers all heterogeneous bonding segments 120, without distinguishing the size of the heterogeneous bonding segments 120, providing a higher level of protection for sealing effectiveness.

[0053] Continue to refer Figure 9 , Figure 9 This is another schematic diagram of a sealing path for the electronic device frame and the clamp provided in the embodiment of the present application. Figure 9 As shown, when the transition portion 600 is a closed loop structure, the entire sealing path is on the transition portion 600 , and a continuous sealing surface without breakpoints can be formed between the frame 100 and the clamp 400 .

[0054] For reference Figure 10 , Figure 10 This is another schematic diagram of a sealing path for the electronic device frame and the clamp provided in the embodiment of the present application. Figure 10 As shown, when the transition portion 600 is annular with an opening, the sealing path is "transition portion 600-extension portion 500 (corresponding to the opening of the transition portion 600)-transition portion 600", which can form a continuous and seamless sealing surface between the frame 100 and the clamp 400.

[0055] The surface of the transition portion 600 extending from the rear housing mounting surface 110 toward the extension portion 500 is an arc surface. That is, the surface where the transition portion 600 contacts the fixture 400 is an arc surface. The radius of this arc surface is greater than or equal to 0.4 mm, which allows the transition portion 600 to fit more tightly with the fixture 400 and improves sealing reliability. From a machining process perspective, the R angle of the surface where the transition portion 600 contacts the fixture 400 is ≥ 0.4. For example, the radius of the arc surface can be 0.4 mm.

[0056] The transition portion 600 can be made of plastic and can be directly injection molded on the frame 100 to form a strip-shaped plastic body. In a specific implementation, the transition portion 600 can be integrally injection molded with the plastic surface 111 of the rear housing mounting surface 110 to simplify the manufacturing process of the transition portion 600.

[0057] In addition to the configuration of the electronic device of the above embodiment, the following configuration may also be adopted:

[0058] The electronic device includes a frame 100 and a transition portion 600, as well as a display screen 200 and a rear case. The display screen 200 and the rear case are respectively arranged on the top and bottom surfaces of the frame 100. The outer edge of the bottom surface of the frame 100 has a continuous extension portion 500, which surrounds the rear case mounting surface 110. The transition portion 600 is provided on the bottom surface of the frame 100.

[0059] Continue to refer Figure 11 , Figure 11 This is a schematic diagram of the structure of the transition portion of the electronic device frame provided in an embodiment of the present application. Figure 11 As shown, the transition portion 600 is provided on the extension portion 500. The transition portion 600 extends along the circumference of the extension portion 500 to form a closed loop structure. The transition portion 600 can entirely wrap the extension portion 500, or it can be provided only on the side of the extension portion 500 facing the bottom side of the frame 100.

[0060] Continue to refer Figure 12 , Figure 12 This is another schematic diagram of a sealing path for the electronic device frame and the clamp provided in the embodiment of the present application. Figure 12 As shown, the transition portion 600 of the closed-loop structure naturally covers all the heterogeneous combination sections 120 in the circumferential direction of the frame 100 , and the sealing path is entirely on the extension portion 500 , forming a continuous and seamless sealing surface between the frame 100 and the clamp 400 .

[0061] The transition portion 600 can be made of plastic and can be directly injection molded on the extension portion 500 to form a uniform annular plastic body. Furthermore, the transition portion 600 can be integrally injection molded with the plastic surface 111 of the rear housing mounting surface 110 to simplify the manufacturing process of the transition portion 600.

[0062] Continue to refer Figure 13 , Figure 13 This is a schematic diagram of the cooperation between the electronic device frame and the fixture provided in the embodiment of the present application. Figure 13 As shown, in a specific implementation, the contact surface between the sealing ring of the clamp 400 and the frame 100, corresponding to the rear shell mounting surface 110 and the area between the rear shell mounting surface 110 and the extension portion 500, may have a gap B to ensure that the sealing ring of the clamp 400 fits tightly with the transition portion 600.

[0063] The above is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in this application should be covered by the protection scope of the present application.

Claims

1. An electronic device, characterized in that: It includes a display screen, a rear cover and a frame, wherein the display screen and the rear cover are respectively arranged on the top surface and the bottom surface of the frame; The bottom surface of the frame is provided with an extension portion and a transition portion, wherein the transition portion is connected to the extension portion; The bottom surface of the frame includes a rear shell mounting surface, and the extension portion surrounds the rear shell mounting surface; The rear shell mounting surface is provided with a heterogeneous bonding section; The transition portion is close to the heterogeneous combination section in the circumferential direction of the frame, and the transition portion is provided on both sides of a single heterogeneous combination section in the circumferential direction of the frame.

2. The electronic device according to claim 1, wherein The transition portion is located between the extension portion and the rear shell mounting surface.

3. The electronic device according to claim 2, wherein: The rear shell mounting surface includes a plastic surface and a metal surface, and the connection between the plastic surface and the metal surface forms the heterogeneous bonding section; The transition portion is located between the heterogeneous combination section and the extension portion.

4. The electronic device according to claim 3, wherein: There are multiple transition parts, and the heterogeneous combination section is located between adjacent transition parts.

5. The electronic device according to claim 4, wherein: The transition portion is in a straight line or a curved line.

6. The electronic device according to claim 3, wherein: The transition portion is a closed loop structure extending along the circumference of the frame.

7. The electronic device according to claim 6, wherein: The transition portion has an opening, and the first end and the second end of the transition portion are spaced apart to form the opening; The heterogeneous bonding section is located between the first end and the second end of the transition portion.

8. The electronic device according to claim 1, wherein The transition portion is provided on the extension portion, and the transition portion is a closed loop structure extending along the circumference of the frame.

9. The electronic device according to claim 8, wherein The transition portion wraps the extension portion.

10. The electronic device according to any one of claims 1 to 9, wherein: The transition portion is made of plastic.

11. The electronic device according to claim 10, wherein: The rear shell mounting surface includes a plastic surface and a metal surface, and the connection between the plastic surface and the metal surface forms the heterogeneous bonding section; The transition portion is located between the heterogeneous combination section and the extension portion; The transition portion and the plastic surface are integrally formed.

12. The electronic device according to any one of claims 1 to 9, wherein: The surface of the transition portion is an arc surface.

13. The electronic device according to any one of claims 1 to 9, wherein: The transition portion is made of plastic, and the surface of the transition portion is an arc surface.

14. The electronic device according to any one of claims 1 to 9, wherein: The rear shell mounting surface includes a plastic surface and a metal surface, and the connection between the plastic surface and the metal surface forms the heterogeneous bonding section; The transition portion is located between the heterogeneous combination section and the extension portion; The transition portion and the plastic surface are integrally formed; The surface of the transition portion is an arc surface.

15. The electronic device according to claim 12, wherein: The radius of the arc surface is greater than or equal to 0.4 mm.

16. The electronic device according to claim 13, wherein: The radius of the arc surface is greater than or equal to 0.4 mm.

17. The electronic device according to claim 14, wherein: The radius of the arc surface is greater than or equal to 0.4 mm.

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