Foldable electronic equipment

Abstract

The invention provides foldable electronic equipment. The foldable electronic equipment comprises a first shell, a second shell, a third shell, a main circuit board and a flexible circuit board, the flexible circuit board comprises a first flexible part and a second flexible part; the first shell comprises a first middle frame, the second shell comprises a second middle frame, and the third shell comprises a third middle frame; when the foldable electronic device is in a folded state, the first shell, the third shell and the second shell are sequentially stacked in the thickness direction of the foldable electronic device, and a part of the third middle frame, the first middle frame and the second middle frame are all located on the outermost side of the foldable electronic device and all form antenna radiators. Around the thickness direction of the foldable electronic equipment, the length of the antenna radiator formed by the first middle frame is larger than that of the antenna radiator formed by the second middle frame, and the length of the antenna radiator formed by the first middle frame is larger than that of the antenna radiator formed by the third middle frame. The loss of signal transmission is reduced, lines on the flexible circuit board are reduced, and the width of the flexible circuit board is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electronic devices, and in particular to a foldable electronic device. Background Art

[0002] With the development of science and technology, various electronic devices have become indispensable products in daily life and production. Among them, foldable electronic devices have gradually become a development trend due to their advantages of large display area and easy portability.

[0003] A tri-fold electronic device, which is based on a two-fold electronic device, has attracted attention. The tri-fold electronic device includes three housings that are connected by rotating in sequence.

[0004] Current foldable electronic devices often use a metal frame as the antenna's radiator, which typically requires electrical connection to the main circuit board. However, for tri-fold electronic devices, this connection requires more radiators to be threaded through the main circuit board, resulting in significant signal loss and a wider flexible circuit board. Summary of the Invention

[0005] The present application provides a foldable electronic device, which reduces the number of radiators that need to pass through the axis.

[0006] The first aspect of the present application provides a foldable electronic device, comprising: a first shell, a second shell, a third shell, a main circuit board, and a flexible circuit board; the flexible circuit board comprises a first flexible portion and a second flexible portion connected to each other; one side of the first shell and the second shell are rotationally connected, and the third shell and the second shell are rotationally connected away from the side of the first shell. The main circuit board is arranged in the first shell; the first flexible portion is arranged in the first shell and the second shell, and is electrically connected to the main circuit board; the second flexible portion is arranged in the second shell and the third shell, and is electrically connected to the first flexible portion. The first shell includes a first middle frame, the second shell includes a second middle frame, and the third shell includes a third middle frame; the first middle frame, the second middle frame and the third middle frame are electrically connected to the main circuit board, the first flexible portion and the second flexible portion, respectively. That is, the first middle frame is electrically connected to the main circuit board, the second middle frame is electrically connected to the first flexible portion, and the third middle frame is electrically connected to the second flexible portion;

[0007] When the foldable electronic device is in a folded state, the first shell, the third shell and the second shell are stacked in sequence along the thickness direction of the foldable electronic device, and a portion of the third middle frame is blocked by the connection between the first shell and the second shell; another portion of the third middle frame, the first middle frame and the second middle frame all form antenna radiators; surrounding the thickness direction of the foldable electronic device, the length of the first middle frame is greater than the length of the second middle frame, and the length of the first middle frame is greater than the length of another portion of the third middle frame.

[0008] The length of the portion of the first middle frame that can serve as the antenna radiator is the longest, so the antenna radiator formed by the first middle frame can be divided into the largest number of radiators, and the first middle frame can be directly electrically connected to the main circuit board without the need for indirect electrical connection through a flexible circuit board. The lengths of the portions of the second and third middle frames that can serve as the antenna radiator are both shorter than the lengths of the portions of the first middle frame that can serve as the antenna radiator. Therefore, the number of radiators that the antenna radiator formed by the second middle frame can be divided into is smaller than the number of radiators that the antenna radiator formed by the first middle frame can be divided into, and the number of radiators that the antenna radiator formed by the third middle frame can be divided into is also smaller than the number of radiators that the antenna radiator formed by the first middle frame can be divided into.

[0009] In this application, the main circuit board is placed in the first housing, which has the largest number of radiators. This means that a larger number of radiators are directly electrically connected to the main circuit board. This shortens the signal transmission path and reduces losses. Furthermore, the number of radiators that need to be connected to the main circuit board via the flexible circuit board is reduced, which in turn reduces the number of traces on the flexible circuit board, ultimately reducing the width of the flexible circuit board.

[0010] In some embodiments, the first middle frame forms a first radiator, and the second middle frame forms a second radiator. When the foldable electronic device is in a folded state, the first radiator and the second radiator are spaced apart and opposite to each other along the thickness direction of the foldable electronic device, and the second radiator is a parasitic branch of the first radiator. The first radiator serves as the main antenna and needs to be electrically connected to the RF chip and the switch unit. Specifically, the RF chip and the switch unit are both provided on the main circuit board. A feeding cable and a switch cable are connected between the RF chip and the first radiator. As a parasitic branch of the first radiator, the second radiator needs to be electrically connected to the switch unit and does not need to be connected to the RF chip on the main circuit board. Therefore, there is no need to set a feeding cable on the flexible circuit board, and only lines such as the switch cable need to be set. In this way, the radiation bandwidth of the first radiator can be enhanced and the width of the flexible circuit board can be reduced.

[0011] In some embodiments, the first middle frame includes a first frame, a second frame, and a third frame, the first and second frames being located at opposite ends of the first housing along the length direction, and the ends of the third frame being connected to the first and second frames, respectively. The first, second, and third frames each form at least one first radiator. The second middle frame includes a fourth frame and a fifth frame, the fourth and fifth frames being located at opposite ends of the second housing along the length direction. The fourth and fifth frames each form at least one second radiator. When the foldable electronic device is in a folded state, along the thickness direction of the foldable electronic device, the first and fourth frames are spaced apart from each other, and the second and fourth frames are spaced apart from each other. The second radiator formed on the fourth frame is a parasitic branch of the first radiator formed on the first frame, and the second radiator formed on the fifth frame is a parasitic branch of the first radiator formed on the second frame. That is, the portions of the second middle frame that are spaced apart from each other and the first middle frame serve as parasitic branches of the first radiator, thereby increasing the radiation bandwidth of the multiple first radiators.

[0012] In some embodiments, when the foldable electronic device is in a folded state, along the thickness direction of the foldable electronic device, the projection of the second radiator formed on the fourth frame on the first middle frame at least partially overlaps with the first radiator formed on the first frame, and the projection of the second radiator formed on the fifth frame on the first middle frame at least partially overlaps with the first radiator formed on the second frame. This allows coupling capacitance to be formed between the first radiator and the second radiator forming its parasitic branch, thereby generating an excitation resonant signal and increasing the radiation bandwidth of the first radiator.

[0013] In some embodiments, the third middle frame forms a third radiator. When the foldable electronic device is folded, the third radiator is spaced apart from the first radiator along the thickness of the foldable electronic device and acts as a parasitic branch of the first radiator. As a parasitic branch, the third radiator does not need to be connected to the RF chip on the main circuit board. Therefore, there is no need to install a feed cable on the flexible circuit board; only switching cables and other wiring are required. This can both enhance the radiation bandwidth of the first radiator and reduce the width of the flexible circuit board.

[0014] In some embodiments, the third middle frame includes a sixth frame and a seventh frame, which are located at opposite ends of the third housing along the length direction. The sixth frame and the seventh frame each form at least one third radiator. When the foldable electronic device is in a folded state, the sixth frame and the fourth frame are spaced apart and opposite each other along the thickness direction of the foldable electronic device, and the seventh frame and the fifth frame are spaced apart and opposite each other. The third radiator formed in the sixth frame is a parasitic branch of the first radiator formed in the first frame, and the third radiator formed in the seventh frame is a parasitic branch of the first radiator formed in the second frame. In other words, the portions of the third middle frame and the first middle frame that are spaced apart and opposite each other serve as parasitic branches of the first radiator, thereby further increasing the radiation bandwidth of the multiple first radiators.

[0015] In some embodiments, when the foldable electronic device is in a folded state, along the thickness direction of the foldable electronic device, the projection of the third radiator formed on the sixth frame on the first middle frame at least partially overlaps with the first radiator formed on the first frame, and the projection of the third radiator formed on the seventh frame on the first middle frame at least partially overlaps with the first radiator formed on the second frame. This allows coupling capacitance to be formed between the first radiator and the third radiator forming its parasitic branch, thereby generating an excitation resonant signal and increasing the radiation bandwidth of the first radiator.

[0016] In some embodiments, the first middle frame forms a first radiator, and the second middle frame forms a second radiator. When the foldable electronic device is in a folded state, the first radiator and the second radiator are spaced apart and opposite each other along the thickness direction of the foldable electronic device. The first radiator supports signals in a first frequency band, and the second radiator supports signals in a second frequency band. Setting the first radiator and the second radiator to operate in different frequency bands can not only increase the frequency bands supported by the foldable electronic device, but also prevent co-frequency coupling between the first radiator and the second radiator, thereby reducing the risk of signal crosstalk between the first radiator and the second radiator.

[0017] In some embodiments, the third middle frame forms a third radiator. When the foldable electronic device is in the folded state, the first radiator, the third radiator, and the second radiator are spaced and opposed to each other in sequence along the thickness direction of the foldable electronic device. The third radiator is a parasitic branch of the first radiator, which can increase the radiation bandwidth of the first radiator and reduce the width of the flexible circuit board. Alternatively, the third radiator is a parasitic branch of the second radiator, which can increase the radiation bandwidth of the second radiator and reduce the width of the flexible circuit board.

[0018] In some embodiments, the first middle frame forms a first radiator, and the third middle frame forms a third radiator. When the foldable electronic device is in a folded state, the third radiator and the first radiator are spaced apart and opposite each other along the thickness direction of the foldable electronic device. The first radiator supports signals in a first frequency band, and the third radiator supports signals in a third frequency band. This can increase the number of frequency bands supported by the foldable electronic device and reduce the risk of signal crosstalk between any two of the first, second, and third radiators.

[0019] In some embodiments, the second middle frame forms a second radiator. When the foldable electronic device is in a folded state, the first radiator, the third radiator, and the second radiator are spaced apart from each other in sequence along the thickness direction of the foldable electronic device. The second radiator is a parasitic branch of the first radiator, or the second radiator is a parasitic branch of the third radiator.

[0020] In some embodiments, the third housing includes a first portion and a second portion fixedly connected along the width of the foldable electronic device. Along the thickness direction of the foldable electronic device, the first portion is thicker than the second portion, and the first and second portions enclose a storage space. The first portion pivotally connects to the second housing on a side away from the second portion. When the foldable electronic device is in the folded state, the first housing is located in the storage space and overlaps the second portion. The thicker second portion leaves more space in the thickness direction for the second rotation mechanism, reducing the design difficulty of the second rotation mechanism.

[0021] In some embodiments, the sum of the thicknesses of the first housing and the second portion is equal to the thickness of the first portion, so that the foldable electronic device has a flat appearance, is easy to store, and has good aesthetics.

[0022] In some embodiments, the foldable electronic device further includes a camera, which is disposed within the first housing and electrically connected to the main circuit board. The camera and the main circuit board are disposed within the same housing and electrically connected to the main circuit board. This allows the camera to be directly electrically connected to the main circuit board, eliminating the need for additional through-shaft wiring and further reducing the width of the flexible circuit board.

[0023] In some embodiments, the foldable electronic device further comprises a first display screen, a first rotation mechanism, and a second rotation mechanism. The first display screen comprises a flexible display screen, comprising a first display portion, a second display portion, a third display portion, a fourth display portion, and a fifth display portion connected in sequence. The first housing and the second housing are rotationally connected via the first rotation mechanism, and the second housing and the third housing are rotationally connected via the second rotation mechanism. The first display portion is disposed in the first housing, the second display portion is disposed in the first rotation mechanism, the third display portion is disposed in the second housing, the fourth display portion is disposed in the second rotation mechanism, and the fifth display portion is disposed in the third housing. When the foldable electronic device is in a folded state, the first display portion is stacked between the first housing and the third housing, the third display portion and the fifth display portion are stacked between the second housing and the third housing, and the second display portion and the fourth display portion are in a bent state. The first display screen is a flexible display screen and serves as an inner screen.

[0024] In some embodiments, the foldable electronic device further includes a second display screen, which is disposed on a side of the second housing facing away from the first display portion. When the foldable electronic device is folded, the second display screen is located at the outermost side of the foldable electronic device. The second display screen is a rigid display screen and serves as an external screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0026] Figure 1 This is a schematic structural diagram of the foldable electronic device provided in an embodiment of the present application in a first state.

[0027] Figure 2 yes Figure 1 Schematic diagram of the split structure of the foldable electronic device shown in.

[0028] Figure 3 This is a schematic structural diagram of the foldable electronic device provided in an embodiment of the present application in the second state.

[0029] Figure 4 This is a schematic diagram of the process of switching the foldable electronic device from a first state to a second state provided in an embodiment of the present application.

[0030] Figure 5 This is a schematic diagram of the partial structure of the foldable electronic device provided in an embodiment of the present application in a first state.

[0031] Figure 6 This is a schematic diagram of the partial structure of the foldable electronic device provided in an embodiment of the present application in the second state.

[0032] Figure 7This is another partial structural schematic diagram of the foldable electronic device provided in an embodiment of the present application in the first state.

[0033] Figure 8 This is another partial structural diagram of the foldable electronic device provided in an embodiment of the present application in the first state.

[0034] Figure 9 This is a partial structural diagram of another structure of the foldable electronic device provided in an embodiment of the present application in the first state.

[0035] Figure 10 This is another partial structural diagram of the foldable electronic device provided in an embodiment of the present application in the second state.

[0036] Figure 11 This is a partial structural diagram of another implementation of the foldable electronic device provided in an embodiment of the present application in the second state.

[0037] Figure 12 This is another partial structural diagram of the foldable electronic device provided in an embodiment of the present application.

[0038] Figure 13 This is a schematic structural diagram of another foldable electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0040] See also Figure 1 and Figure 2 , Figure 1 1 is a schematic structural diagram of a foldable electronic device 1000 provided in an embodiment of the present application in a first state. Figure 2 yes Figure 1 A schematic diagram of the split structure of the foldable electronic device 1000 is shown in FIG.

[0041] Figure 1 The foldable electronic device 1000 is shown in an unfolded state. Figure 1 The unfolded angle of the foldable electronic device 1000 is 180 degrees. The foldable electronic device 1000 includes, but is not limited to, a cell phone, a notebook computer, a tablet personal computer, a personal digital assistant, a wearable device, or a mobile device. In the embodiments of the present application, the foldable electronic device 1000 is described as a cell phone.

[0042] It should be noted that the angles illustrated in the embodiments of this application are allowed to have slight deviations. For example, Figure 1 The unfolding angle of the foldable electronic device 1000 shown is 180 degrees, and the deviation can be ±5 degrees. The angles described below as examples can be understood in the same way.

[0043] For ease of description, the width direction of the foldable electronic device 1000 is defined as the X-axis direction, the length direction of the foldable electronic device 1000 is defined as the Y-axis direction, and the thickness direction of the foldable electronic device 1000 is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.

[0044] The foldable electronic device 1000 includes a main body 100, a first display screen 200, and a second display screen 300. Both the first display screen 200 and the second display screen 300 are mounted on the main body 100. The first display screen 200 is a flexible display screen, while the second display screen 300 is a rigid screen. Both the first display screen 200 and the second display screen 300 include a mounting surface for displaying denominations, with the display surface and the mounting surface facing each other. The display surfaces are used to display text, images, videos, and the like. The first display screen 200 includes a first display portion 210, a second display portion 220, a third display portion 230, a fourth display portion 240, and a fifth display portion 250, which are connected in sequence.

[0045] The main body 100 includes a first housing 10, a second housing 20, a third housing 30, a first rotation mechanism 40, and a second rotation mechanism 50. The first housing 10, the second housing 20, and the third housing 30 are arranged sequentially along the X-axis. The first housing 10 has a first receiving slot on the side facing the second housing 20, and the second housing 20 has a second receiving slot on the side facing the first housing 10. The first receiving slot and the second receiving slot communicate with each other to form a first receiving chamber. The first rotation mechanism 40 is mounted in the first receiving chamber to provide a rotational connection between the first housing 10 and the second housing 20, allowing the first housing 10 and the second housing 20 to rotate relative to each other via the first rotation mechanism 40. The second housing 20 has a third receiving slot on the side facing the third housing 30, and the third housing 30 has a fourth receiving slot on the side facing the second housing 20. The third and fourth receiving slots communicate with each other to form a second receiving chamber. The second rotation mechanism 50 is mounted in the second receiving chamber to provide a rotational connection between the second housing 20 and the third housing 30, allowing the second housing 20 and the third housing 30 to rotate relative to each other via the second rotation mechanism 50, thereby enabling the main body 100 to switch between a folded state and an unfolded state.

[0046] The first display screen 200 is mounted on the main body 100, and the mounting surface of the first display screen 200 is fixedly connected to the main body 100. Specifically, the first display portion 210 is mounted on the first housing 10, the third display portion 230 is mounted on the second housing 20, and the fifth display portion 250 is mounted on the third housing 30. The second display portion 220 is positioned opposite the first rotation mechanism 40, and the fourth display portion 240 is positioned opposite the second rotation mechanism 50 to achieve bending of the first display screen 200. The second display screen 300 is positioned on the side of the second housing 20 facing away from the first display portion 210.

[0047] When the foldable electronic device 1000 is in the unfolded state, the first display screen 200 has a larger display area, and both the first display screen 200 and the second display screen 300 can display.

[0048] Figure 3 3 is a schematic structural diagram of the foldable electronic device 1000 provided in an embodiment of the present application in the second state. Figure 3 The foldable electronic device 1000 is shown in a folded state. When the foldable electronic device 1000 is in a folded state, its shape is roughly "G"-shaped, so Figure 3 The foldable electronic device 1000 shown in FIG is also referred to as a G-type foldable phone. The first housing 10, the third housing 30, and the second housing 20 are stacked sequentially along the Z-axis. The first display 200 is the inner screen of the foldable electronic device 1000, and the second display 300 is the outer screen of the foldable electronic device 1000. In other words, when the foldable electronic device 1000 is in the folded state, the first display 200 is located on the inner side of the foldable electronic device 1000. Specifically, the first display portion 210 is stacked between the first housing 10 and the third housing 30, the third display portion 230 and the fifth display portion 250 are stacked between the second housing 20 and the third housing 30, and the second display portion 220 and the fourth display portion 240 are in a bent state. The second display 300 is located on the outer side of the foldable electronic device 1000. Specifically, the second display 300 is located on the side of the first housing 10 facing away from the first display portion 210. In this case, the first display 200 is blocked, while the second display 300 can display.

[0049] Please refer to Figure 4 , Figure 4: This is a schematic diagram of the process of switching the foldable electronic device 1000 from the first state to the second state provided by an embodiment of the present application. When the foldable electronic device 1000 switches from the unfolded state to the folded state, the third shell 30 is first rotated clockwise so that the third shell 30 is stacked on the second shell 20, and then the first shell 10 is rotated counterclockwise so that the first shell 10 is stacked on the third shell 30. At this time, the foldable electronic device 1000 is in the folded state. When the foldable electronic device 1000 switches from the folded state to the unfolded state, the first shell 10 is first rotated clockwise and then the third shell 30 is rotated counterclockwise. Therefore, whether switching from the unfolded state to the folded state or from the folded state to the unfolded state, only one shell is flipped each time, and the unfolding and folding process is relatively smooth.

[0050] Please refer to Figure 5 , Figure 5 : is a schematic diagram of the partial structure of the foldable electronic device 1000 provided in an embodiment of the present application in the first state. In some embodiments, the first shell 10 includes a first back plate 11 and a first middle frame 12. The first back plate 11 can be a rectangular plate. The first middle frame 12 is connected to the outer periphery of one side surface of the first back plate 11, and the first back plate 11 and the first middle frame 12 enclose a first mounting cavity 101. The first middle frame 12 includes a first frame 13, a third frame 15, and a second frame 14 connected in sequence. The first frame 13 and the second frame 14 are located at opposite ends of the first back plate 11 along the Y-axis direction. The length directions of the first frame 13 and the second frame 14 are both parallel to the X-axis direction. The opposite ends of the third frame 15 are respectively connected to the first frame 13 and the second frame 14, and the length direction of the third frame 15 is parallel to the Y-axis direction.

[0051] The second housing 20 includes a second back plate 21 and a second middle frame 22. The second back plate 21 can be rectangular. The second middle frame 22 is connected to the outer periphery of one side surface of the second back plate 21. The second back plate 21 and the second middle frame 22 enclose a second mounting cavity 201. The second middle frame 22 includes a fourth side frame 23 and a fifth side frame 24. The fourth side frame 23 and the fifth side frame 24 are located at opposite ends of the second back plate 21 along the Y-axis. The lengths of the fourth side frame 23 and the fifth side frame 24 are both parallel to the X-axis.

[0052] The third shell 30 includes a third back plate 31 and a third middle frame 32. The third back plate 31 can be in the shape of a rectangular plate. The third middle frame 32 is connected to the outer periphery of one side surface of the third back plate 31, and the third back plate 31 and the third middle frame 32 enclose a third mounting cavity 301. The third middle frame 32 includes a sixth frame 33, a seventh frame 34, and an eighth frame 35. The sixth frame 33 and the seventh frame 34 are located at opposite ends of the third back plate 31 along the Y-axis direction. The length directions of the seventh frame 34 and the eighth frame 35 are both parallel to the X-axis direction. The ends of the eighth frame 35 are connected to the sixth frame 33 and the seventh frame 34 respectively, and the length direction of the eighth frame 35 is parallel to the Y-axis direction.

[0053] With the trend of lightweight and thin development of the foldable electronic device 1000 and the increase in communication needs, usually, the first middle frame 12, the second middle frame 22 and the third middle frame 32 are all made of metal and are used as antenna radiators, which can increase the communication quality of the foldable electronic device 1000 on the one hand, and on the other hand, eliminate the need for additional antenna radiators, reducing the number of parts of the foldable electronic device 1000, which is conducive to the lightweight and thin design of the foldable electronic device 1000.

[0054] Please refer to Figure 5 When the foldable electronic device 1000 is in the unfolded state, the first housing 10, the second housing 20 and the third housing 30 are arranged in sequence along the X-axis direction, and the first frame 13 to the eighth frame 35 are all exposed to the outside. Figure 6 , Figure 6 : This is a partial structural diagram of the foldable electronic device 1000 provided in an embodiment of the present application in the second state. When the foldable electronic device 1000 is in the folded state, the first shell 10, the third shell 30, and the second shell 20 are stacked in sequence along the Z-axis direction. At this time, the entire first middle frame 12, the entire second middle frame 22, and a portion of the third middle frame 32 are all exposed on the outermost side of the foldable electronic device 1000. Here, the outermost side refers to: the entire first middle frame 12, the entire second middle frame 22, and a portion of the third middle frame 32 are all in a visible state, that is, a state that can be seen by the human eye; another portion of the third middle frame 32 is located on the inner side of the foldable electronic device 1000. In detail, that is, the first frame 13, the second frame 14, the third frame 15, the fourth frame 23, the fifth frame 24, the sixth frame 33, and the seventh frame 34 are all located on the outermost side of the foldable electronic device 1000, while the eighth frame 35 is located on the inner side of the foldable electronic device 1000. The eighth frame 35 is opposite to the second display portion 220, that is, the eighth frame 35 is blocked by the second display portion 220.

[0055] Therefore, when the foldable electronic device 1000 is in the folded state, the entire first middle frame 12, the entire second middle frame 22, and a portion of the third middle frame 32 are not blocked and can serve as antenna radiators, facilitating signal reception and transmission by the foldable electronic device 1000. In other words, the first frame 13, the second frame 14, the third frame 15, the fourth frame 23, the fifth frame 24, the sixth frame 33, and the seventh frame 34 can all serve as antenna radiators.

[0056] For some examples, please refer to Figure 7 , Figure 7 FIG2 is another partial structural diagram of the foldable electronic device 1000 provided in an embodiment of the present application in a first state. The foldable electronic device 1000 further includes a main circuit board 60, a first auxiliary circuit board 70, a second auxiliary circuit board 71, a flexible circuit board 80, a first battery 90, a second battery 91, and a third battery 92. The first battery 90 is disposed within the first mounting cavity 101 of the first housing 10, the second battery 91 is disposed within the second mounting cavity 201 of the second housing 20, and the third battery 92 is disposed within the third mounting cavity 301 of the third housing 30. The first battery 90, the second battery 91, and the third battery 92 are used to power components such as the main circuit board 60, the first auxiliary circuit board 70, the second auxiliary circuit board 71, the flexible circuit board 80, the first display screen 200, and the second display screen 300.

[0057] The main circuit board 60 is mounted in the second mounting cavity 201 of the second housing 20, the first auxiliary circuit board 70 is mounted in the first mounting cavity 101 of the first housing 10, and the second auxiliary circuit board 71 is mounted in the third mounting cavity 301 of the third housing 30. The flexible circuit board 80 includes a first flexible portion 81 and a second flexible portion 82. The first flexible portion 81 is mounted in the first housing 10 and the second housing 20, and is electrically connected to the main circuit board 60 and the first auxiliary circuit board 70, respectively. The first middle frame 12 is further electrically connected to the first auxiliary circuit board 70, enabling communication between the first middle frame 12 and the main circuit board 60 through the first auxiliary circuit board 70 and the first flexible portion 81. The second flexible portion 82 is mounted in the second housing 20 and the third housing 30, and is electrically connected to the main circuit board 60 and the second auxiliary circuit board 71, respectively. The third middle frame 32 is further electrically connected to the second auxiliary circuit board 71, enabling communication between the third middle frame 32 and the main circuit board 60 through the second auxiliary circuit board 71 and the second flexible portion 82. It can be understood that the first flexible portion 81 needs to pass through the first rotating mechanism 40 , and the second flexible portion 82 needs to pass through the second rotating mechanism 50 .

[0058] Specifically, when the first frame 13, the second frame 14, the third frame 15, the fourth frame 23, the fifth frame 24, the sixth frame 33, and the seventh frame 34 all function as antenna radiators, they must all be connected to the main circuit board 60. The fourth and fifth frames 23, 24, and the main circuit board 60 are all located within the second housing 20. Therefore, the fourth and fifth frames 23, 24 can be directly electrically connected to the main circuit board 60 without requiring additional circuit boards. The first, second, and third frames 13, 14, and 15 must be electrically connected to the main circuit board 60 via the first flexible portion 81. Therefore, the first flexible portion 81 must be provided with corresponding circuitry to facilitate electrical connection between the first, second, and third frames 13, 14, and 15. The sixth and seventh frames 33, 34 must be electrically connected to the main circuit board 60 via the second flexible portion 82. Therefore, the second flexible portion 82 must be provided with corresponding circuitry to facilitate electrical connection between the sixth and seventh frames 33, 34.

[0059] Typically, the lengths of the first frame 13, the second frame 14, the fourth frame 23, the fifth frame 24, the sixth frame 33, and the seventh frame 34 are all equal, and the lengths of the third frame 15 and the eighth frame 35 are equal. Assume that the length of the first frame 13 is L1, the length of the third frame 15 is L2, and L1 is less than L2. Then the total length of the first middle frame 12 is: the length L1 of the first frame 13 + the length L1 of the second frame 14 + the length L2 of the third frame 15 = 2*L1+L2. The total length of the second middle frame 22 is: the length L1 of the fourth frame 23 + the length L1 of the fifth frame 24 = 2*L1. The total length of the third middle frame 32 is: the length L1 of the sixth frame 33 + the length L1 of the seventh frame 34 + the length L2 of the eighth frame 35 = 2*L1+L2. As can be seen from the above, the total length of the first middle frame 12 is equal to the total length of the third middle frame 32, and the total length of the first middle frame 12 is greater than the total length of the second middle frame 22.

[0060] Five frames, namely the first frame 13, the second frame 14, the third frame 15, the sixth frame 33, and the seventh frame 34, need to be electrically connected to the main circuit board 60 via the flexible circuit board 80. The sum of the lengths of the first frame 13, the second frame 14, the third frame 15, the sixth frame 33, and the seventh frame 34 is 4*L1+L2. Two frames, namely the fourth frame 23 and the fifth frame 24, do not need to be electrically connected to the main circuit board 60 via the flexible circuit board 80. The sum of the lengths of the fourth frame 23 and the fifth frame 24 is 2*L1. As can be seen, in this design, the antenna radiator with a length of 4*L1+L2 needs to be electrically connected to the main circuit board 60 via the flexible circuit board 80, resulting in a longer transmission path for this portion of the antenna radiator. As is well known to those skilled in the art, the longer the signal transmission path, the greater the loss, while the shorter the signal transmission path, the lower the loss. In this design, the antenna radiator with a length of 4*L1+L2 has a longer signal transmission path and greater loss, while the antenna radiator with a length of only 2*L1 has a shorter signal transmission path and less signal loss. An antenna radiator with a length of 4*L1+L2 can be divided into a larger number of radiators, while an antenna radiator with a length of 2*L1 can be divided into a smaller number of radiators. This means that a larger number of radiators need to be indirectly connected to the main circuit board 60 via the flexible circuit board 80, leaving only a smaller number of radiators directly electrically connected to the main circuit board 60. This can lead to significant RF signal loss and a larger width of the flexible circuit board 80 along the Y-axis, further complicating the design of the first and second rotation mechanisms 40 and 50.

[0061] In order to solve the above problems, in some embodiments, please refer to Figure 8 , Figure 8 This is another partial structural diagram of the foldable electronic device 1000 provided in an embodiment of the present application in a first state. The main circuit board 60 is disposed in the first mounting cavity 101 of the first housing 10, the first auxiliary circuit board 70 is disposed in the second mounting cavity 201 of the second housing 20, and the second auxiliary circuit board 71 is disposed in the third mounting cavity 301 of the third housing 30. A first flexible portion 81 is disposed in the first housing 10 and the second housing 20, and is electrically connected to the main circuit board 60 and the first auxiliary circuit board 70, respectively. The second middle frame 22 is further electrically connected to the first auxiliary circuit board 70, enabling communication between the second middle frame 22 and the main circuit board 60 via the first auxiliary circuit board 70 and the first flexible portion 81. A second flexible portion 82 is disposed in the second housing 20 and the third housing 30, and is electrically connected to the first flexible portion 81 and the second auxiliary circuit board 71, respectively. The third middle frame 32 is further electrically connected to the second auxiliary circuit board 71, enabling communication between the third middle frame 32 and the main circuit board 60 via the second auxiliary circuit board 71, the first flexible portion 81, and the second flexible portion 82.

[0062] When the first frame 13, second frame 14, third frame 15, fourth frame 23, fifth frame 24, sixth frame 33, and seventh frame 34 all function as antenna radiators, they must all be connected to the main circuit board 60. The first frame 13, second frame 14, and third frame 15 are all located within the first housing 10, allowing them to be directly electrically connected to the main circuit board 60 without requiring additional circuit boards. The fourth and fifth frames 23 and 24, however, must be electrically connected to the main circuit board 60 via the first flexible portion 81. Therefore, the first flexible portion 81 must be configured with corresponding circuitry to facilitate electrical connection between the fourth and fifth frames 23 and 24. The sixth and seventh frames 33 and 34 must be electrically connected to the main circuit board 60 via the second flexible portion 82. Therefore, the second flexible portion 82 and the first flexible portion 81 must be configured with corresponding circuitry to facilitate electrical connection between the sixth and seventh frames 33 and 34.

[0063] Please refer to Figure 9 , Figure 9 This is a partial structural diagram of another structure of the foldable electronic device provided by an embodiment of the present application in the first state. In other embodiments, the first flexible portion 81 and the second flexible portion 82 can also be provided separately, with the ends of the second flexible portion 82 respectively connected to the first auxiliary circuit board 70 and the second auxiliary circuit board 71, and the ends of the first flexible portion 81 respectively connected to the first auxiliary circuit board 70 and the main circuit board 60. In other words, the second auxiliary circuit board 71 is electrically connected to the main circuit board 60 via the second flexible portion 82, the first auxiliary circuit board 70, and the first flexible portion 81 in sequence.

[0064] As can be seen from the above, four frames, namely the fourth frame 23, the fifth frame 24, the sixth frame 33, and the seventh frame 34, require electrical connection to the main circuit board 60 via the flexible circuit board 80. The sum of the lengths of the fourth frame 23, the fifth frame 24, the sixth frame 33, and the seventh frame 34 is 4*L1. Three frames, namely the first frame 13, the second frame 14, and the third frame 15, do not require electrical connection to the main circuit board 60 via the flexible circuit board 80. The sum of their lengths is 2*L1+L2. This shows that, compared to the antenna radiator of 4*L1+L2 in the previous embodiment, which required electrical connection to the main circuit board 60 via the flexible circuit board 80, only the antenna radiator of 4*L1 in this embodiment requires electrical connection to the main circuit board 60 via the flexible circuit board 80. Compared to the shorter signal transmission path of the antenna radiator of 2*L1 in the previous embodiment, the signal transmission path of the antenna radiator of 2*L1+L2 in this embodiment is shorter, resulting in less signal loss. In other words, the length of the antenna radiator with a longer signal transmission path is reduced, while the length of the antenna radiator with a shorter signal transmission path is increased. The number of radiators that can be divided into by the antenna radiator with a length of 4*L1 is less than the number of radiators that can be divided into by the antenna radiator with a length of 4*L1+L2 in the above embodiment. In other words, in this embodiment, the number of radiators that pass through the axis is reduced, and the number of radiators that are directly connected to the main circuit board 60 is increased, thereby reducing the wiring requirements of the flexible circuit board 80. Therefore, the width of the flexible circuit board 80 can be reduced accordingly, thereby reducing the design difficulty of the first rotation mechanism 40 and the second rotation mechanism 50.

[0065] It can be understood that the premise for comparing the two embodiments is that the lengths and numbers of the antenna radiators formed by the first middle frame 12 , the second middle frame 22 , and the third middle frame 32 respectively remain unchanged.

[0066] For some examples, please refer to Figure 8 The foldable electronic device 1000 further includes a camera 93, which is disposed in the first housing 10. The camera 93 and the main circuit board 60 are disposed in the same housing and are electrically connected to the main circuit board 60. Thus, the camera 93 can be directly electrically connected to the main circuit board 60 without requiring additional through-shaft wiring, further reducing the width of the flexible circuit board 80.

[0067] For some examples, please refer to Figure 10 , Figure 10: This is another partial structural diagram of the foldable electronic device 1000 provided in an embodiment of the present application in the second state. The first middle frame 12 forms a first radiator 16, and the second middle frame 22 forms a second radiator 25. When the foldable electronic device 1000 is in the folded state, along the thickness direction of the foldable electronic device 1000, the first radiator 16 and the second radiator 25 are spaced apart and opposite to each other, and the second radiator 25 is a parasitic branch of the first radiator 16. The antenna parasitic structure refers to placing one or more auxiliary structures (such as metal sheets, metal wires, metal rings, etc.) near the radiation field of the main antenna to enhance the radiation bandwidth of the main antenna. Specifically in this embodiment, the first radiator 16 is the main antenna, and the second radiator 25 is the antenna parasitic structure.

[0068] Please refer to Figure 12 , Figure 12 It is another partial structural diagram of the foldable electronic device 1000 provided in an embodiment of the present application. The first radiator 16 serves as the main antenna and needs to be electrically connected to the RF chip 61 and the switch unit 62. Specifically, the RF chip 61 and the switch unit 62 are both arranged on the main circuit board 60. A feeding cable 63 is connected between the RF chip 61 and the first radiator 16, and a switch cable 64 is connected between the switch unit 62 and the first radiator 16. The feeding cable 63 is connected to the feeding point of the first radiator 16 so that the signal of the RF chip 61 can be transmitted to the first radiator 16 through the feeding cable 63, so that the first radiator 16 radiates the signal. The RF chip 61 can also receive the signal of the first radiator 16 through the feeding cable 63. Switch cable 64 connects first radiator 16 to switch unit 62. Switch unit 62 includes multiple frequency band branches, such as a B40 frequency band branch, a B28 frequency band branch, and a B8 frequency band branch. When the switch of one frequency band branch is closed, the switches of the other frequency band branches are open. In this case, first radiator 16 supports the frequency band corresponding to the closed frequency band branch. For example, if the switch of the B40 frequency band branch is closed and the switches of the other frequency band branches are open, first radiator 16 supports signals in the B40 frequency band.

[0069] The second radiator 25, as a parasitic branch of the first radiator 16, needs to be electrically connected to the switch unit 62. Specifically, the switch unit 62 is provided on the main circuit board 60. The structure and function of the switch unit 62 are the same as those described above and will not be repeated here. It can be seen that when the second radiator 25 acts as a parasitic branch of the first radiator 16, it does not need to be connected to the RF chip 61 on the main circuit board 60. Therefore, there is no need to set a feeding cable 63 on the flexible circuit board 80, and only lines such as the switch cable 64 need to be set. In this way, the radiation bandwidth of the first radiator 16 can be enhanced and the width of the flexible circuit board 80 can be reduced. In other embodiments, the switch unit 62 can also realize the switching of receiving and transmitting RF signals.

[0070] For some examples, please refer to Figure 10 , the number of first radiators 16 is multiple. For example, five slits are opened in the first middle frame 12 to divide the first middle frame 12 into six first radiators A, B, C, D, E, and F, wherein the first frame 13 forms the first radiators A and B, the second frame 14 forms the first radiators E and F, and the third frame 15 forms the first radiators C and D. Exemplarily, among the six first radiators 16, A, C, and F all support medium and high frequencies, D and E all support low frequencies, and B supports GPS and wifi. That is, four of the first radiators 16 support medium and high frequencies, two of the first radiators 16 support low frequencies, and one of the first radiators 16 supports GPS and wifi. In other words, the foldable electronic device 1000 uses multiple-input multiple-output (MIMO) technology in the high frequency band, specifically 4*4 MIMO. The foldable electronic device 1000 uses 2*2 MIMO in the low frequency band.

[0071] In other embodiments, the first middle frame 12 may also have one, two, three, four, or six slits, and the resulting first radiator 16 may be in the shape of a straight line, an L, or other shapes, although this application is not limited thereto. It is understood that the slits may be filled with an insulating medium to maintain the integrity of the first middle frame 12 and enhance its structural strength and aesthetics. The slits provided in the other middle frames described below may also be treated similarly and will not be further described in this application.

[0072] For the corresponding reference, please refer to Figure 10 The number of the second radiators 25 can be multiple. For example, a gap is provided in the fourth side frame 23 of the second middle frame 22 to separate the fourth side frame 23 into two second radiators G and H. A gap is provided in the fifth side frame 24 of the second middle frame 22 to separate the fifth side frame 24 into two second radiators I and J.

[0073] When the foldable electronic device 1000 is in the folded state, along the thickness direction of the foldable electronic device 1000, the first frame 13 and the fourth frame 23 are spaced apart from each other, and the second frame 14 and the fourth frame 23 are spaced apart from each other. The second radiator 25 formed on the fourth frame 23 is a parasitic branch of the first radiator 16 formed on the first frame 13, and the second radiator 25 formed on the fifth frame 24 is a parasitic branch of the first radiator 16 formed on the second frame 14. Specifically, the second radiator H is a parasitic branch of the first radiator A, and the second radiator G is a parasitic branch of the first radiator B. The second radiator I is a parasitic branch of the first radiator E, and the second radiator J is a parasitic branch of the first radiator F. As a result, the radiation bandwidth of the first radiators A, B, E, and F is enhanced.

[0074] Specifically, taking the first radiator A and the second radiator H as an example, the first radiator A can be a half-wavelength antenna or a quarter-wavelength antenna, and the second radiator H can be a half-wavelength antenna or a quarter-wavelength antenna. When the foldable electronic device is in the folded state, the first radiator A and the second radiator H are spaced apart and face each other, forming a coupling capacitor between them, which can couple excitation to form an excitation resonant signal. The RF energy of the first radiator A is transmitted to the second radiator H through coupling, causing the second radiator H to resonate, thereby increasing the radiation bandwidth of the first radiator A.

[0075] For some examples, please refer to Figure 10 When the foldable electronic device 1000 is in the folded state, along the thickness direction of the foldable electronic device 1000, the projection of the second radiator 25 formed on the fourth frame 23 on the first middle frame 12 at least partially overlaps with the first radiator 16 formed on the first frame 13. The projection of the second radiator 25 formed on the fifth frame 24 on the first middle frame 12 at least partially overlaps with the first radiator 16 formed on the second frame 14. As a result, a coupling capacitor is formed between the first radiator 16 and the second radiator 25 forming its parasitic branch, thereby generating an excitation resonance signal and increasing the radiation bandwidth of the first radiator 16.

[0076] In one specific embodiment, the first radiator 16 and the second radiator 25 forming its parasitic stub are of the same length and aligned at both ends. That is, the position and length of the gap between the fourth frame 23 and the first frame 13 are the same, and the position and length of the gap between the fifth frame 24 and the second frame 14 are the same. As a result, the coupling capacitor formed between the first radiator 16 and the second radiator 25 forming its parasitic stub has a larger capacity, thereby generating a larger excitation resonance signal, further increasing the radiation bandwidth of the first radiator 16.

[0077] Of course, in another specific embodiment, please refer to Figure 11 , Figure 11 This is a partial structural diagram of another embodiment of the foldable electronic device provided by the present application in the second state. Alternatively, the first radiator 16 and the second radiator 25 forming its parasitic branch may have different lengths, or the first radiator 16 and the second radiator 25 forming its parasitic branch may have the same length but be staggered at their ends. In other words, the gaps may be positioned at different locations.

[0078] For some examples, please refer to Figure 10The third middle frame 32 forms a third radiator 36. When the foldable electronic device 1000 is in the folded state, the third radiator 36 and the first radiator 16 are spaced apart and opposed to each other along the thickness direction of the foldable electronic device 1000. The third radiator 36 serves as a parasitic branch of the first radiator 16. As a parasitic branch, the third radiator 36 does not need to be connected to the RF chip 61 of the main circuit board 60. Therefore, there is no need to install a feed cable 63 on the flexible circuit board 80. Only the switch cable 64 and other lines are required. This can both enhance the radiation bandwidth of the first radiator 16 and reduce the width of the flexible circuit board 80.

[0079] For example, a slit is provided in the sixth frame 33 to form two third radiators K and L. A slit is provided in the seventh frame 34 to form two third radiators M and N.

[0080] When the foldable electronic device 1000 is in the folded state, along the thickness direction of the foldable electronic device 1000, the sixth frame 33 and the fourth frame 23 are spaced apart and opposed to each other, and the seventh frame 34 and the fifth frame 24 are spaced apart and opposed to each other. The third radiator 36 formed on the sixth frame 33 is a parasitic branch of the first radiator 16 formed on the first frame 13, and the third radiator 36 formed on the seventh frame 34 is a parasitic branch of the first radiator 16 formed on the second frame 14. Specifically, the third radiator K is a parasitic branch of the first radiator A, the third radiator L is a parasitic branch of the first radiator B, the third radiator N is a parasitic branch of the first radiator E, and the third radiator M is a parasitic branch of the first radiator F. At this point, the second radiators G, H, I, and J are parasitic branches of the first radiators A, B, E, and F respectively, and the third radiators K, L, M, and N are also parasitic branches of the first radiators A, B, E, and F respectively. The radiation bandwidth of A, B, E, and F of the first radiators is further enhanced.

[0081] For some examples, please refer to Figure 10 When the foldable electronic device 1000 is in the folded state, along the thickness direction of the foldable electronic device 1000, the projection of the third radiator 36 formed on the sixth frame 33 on the first middle frame 12 at least partially overlaps with the first radiator 16 formed on the first frame 13. The projection of the third radiator 36 formed on the seventh frame 34 on the first middle frame 12 at least partially overlaps with the first radiator 16 formed on the second frame 14. As a result, a coupling capacitor is formed between the first radiator 16 and the third radiator 36 forming its parasitic branch, thereby generating an excitation resonance signal and increasing the radiation bandwidth of the first radiator 16.

[0082] In one specific embodiment, the first radiator 16 and the third radiator 36 forming its parasitic stub are of the same length and aligned at both ends. That is, the position and length of the gap between the sixth frame 33 and the first frame 13 are the same, and the position and length of the gap between the seventh frame 34 and the second frame 14 are the same. As a result, the coupling capacitor formed between the first radiator 16 and the third radiator 36 forming its parasitic stub has a larger capacity, thereby generating a larger excitation resonance signal, further increasing the radiation bandwidth of the first radiator 16.

[0083] In another specific embodiment, please refer to Figure 11 Alternatively, the first radiator 16 and the third radiator 36 forming its parasitic branch may have different lengths, or the first radiator 16 and the third radiator 36 forming its parasitic branch may be staggered at both ends. In other words, the positions of the gaps may be different.

[0084] For other embodiments, please refer to Figure 10 , the first middle frame 12 forms a first radiator 16, and the second middle frame 22 forms a second radiator 25. When the foldable electronic device 1000 is in the folded state, along the thickness direction of the foldable electronic device 1000, the first radiator 16 and the second radiator 25 are spaced apart and opposite to each other. The first radiator 16 supports signals in the first frequency band, and the second radiator 25 supports signals in the second frequency band. That is, the first radiator 16 and the second radiator 25 are spaced apart and opposite to each other to support signals in different frequency bands. Taking the first radiator A and the second radiator K as an example, the first frequency band supported by the first radiator A can be B1 (1920MHz–1980MHz) in LTE, and the second frequency band supported by the second radiator H can be B5 (824MHz–849MHz) in LTE. In this way, the number of frequency bands supported by the foldable electronic device 1000 can be increased, and the mutual influence between the first radiator A and the second radiator H can be reduced.

[0085] Of course, the second frame 14 of the first middle frame 12 can also form the first radiator 16, and the fifth frame 24 of the second middle frame 22 can also form the second radiator 25. The second frame 14 and the fifth frame 24 support different frequency bands.

[0086] It is well known to those skilled in the art that for antenna MIMO technology, if the first radiator 16 and the second radiator 25, which are spaced relative to each other, operate in the same frequency band, when the first radiator 16 transmits a signal, the signal energy will be absorbed by the second radiator 25. Similarly, when the second radiator 25 transmits a signal, the energy will also be absorbed by the first radiator 16. This will cause crosstalk between signals in the same frequency band, and this phenomenon is called mutual coupling between the same frequencies. In the embodiment of the present application, setting the first radiator 16 and the second radiator 25 to operate in different frequency bands can avoid the same-frequency coupling between the first radiator 16 and the second radiator 25, thereby reducing the risk of signal crosstalk between the first radiator 16 and the second radiator 25.

[0087] Correspondingly, the third middle frame 32 forms a third radiator 36. When the foldable electronic device 1000 is in the folded state, the third radiator 36 and the first radiator 16 are spaced apart and opposed to each other along the thickness direction of the foldable electronic device 1000. The third radiator 36 supports signals in the third frequency band. That is, the first radiator 16, the second radiator 25, and the third radiator 36, which are spaced apart and opposed to each other in sequence, each support signals in three different frequency bands. For example, the frequency bands supported by the first radiator A, the second radiator H, and the third radiator K are the same as those above and will not be repeated here. The third frequency band can be B7 (2500MHz-2570MHz) in LTE. The first radiator A, the second radiator H, and the third radiator K all operate in different frequency bands, which can prevent any two of the three from coupling at the same frequency. This can further increase the number of frequency bands supported by the foldable electronic device 1000 and reduce the risk of signal crosstalk between any two of the three radiators.

[0088] In other embodiments, the first radiator 16 may be configured to support signals in the first frequency band, and the third radiator 36 may be configured to support signals in the third frequency band, thereby increasing the number of frequency bands supported by the foldable electronic device 1000. The second radiator 25 may be configured to serve as a parasitic branch of the first radiator 16 or as a parasitic branch of the third radiator 36, thereby increasing the radiation bandwidth of the first radiator 16 or the third radiator 36, and thereby reducing the width of the flexible circuit board 80. Alternatively, the first radiator 16 may be configured to support signals in the first frequency band, and the second radiator 25 may be configured to support signals in the second frequency band, thereby increasing the number of frequency bands supported by the foldable electronic device 1000. The third radiator 36 may be configured to serve as a parasitic branch of the first radiator 16 or as a parasitic branch of the second radiator 25, thereby increasing the radiation bandwidth of the first radiator 16 or the second radiator 25, and thereby reducing the width of the flexible circuit board 80.

[0089] In the above embodiment, the thickness of the third shell 30 is uniform. Figure 13 , Figure 13 : is a structural schematic diagram of another foldable electronic device 1000 provided in an embodiment of the present application. The third shell 30 includes a first portion 37 and a second portion 38 fixedly connected along the width direction of the foldable electronic device 1000. Along the thickness direction of the foldable electronic device 1000, the thickness of the first portion 37 is greater than the thickness of the second portion 38, and the first portion 37 and the second portion 38 enclose a storage space; the first portion 37 is rotated away from the second portion 38 to connect to the second shell 20. When the foldable electronic device 1000 is in a folded state, the first shell 10 is located in the storage space and is stacked on the second portion 38. The thickness of the second portion 38 is relatively thick, so the space reserved for the second rotating mechanism 50 in the thickness direction is relatively large, which reduces the design difficulty of the second rotating mechanism 50.

[0090] The sum of the thicknesses of the first housing 10 and the second portion 38 is equal to the thickness of the first portion 37. This makes the foldable electronic device 1000 have a flat appearance, is easy to store, and has good aesthetics.

[0091] In the above embodiment, the first frame 13, the second frame 14, the third frame 15, the fourth frame 23, the fifth frame 24, the sixth frame 33, and the seventh frame 34 are all shown as antenna radiators. In fact, in other embodiments, some frames may not be used as antenna radiators. For example, the first frame 13, the second frame 14, the third frame 15, the fourth frame 23, the fifth frame 24, and the sixth frame 33 may be used as antenna radiators, while the seventh frame 34 may not be used as an antenna radiator. In another embodiment, part of some frames may be used as antenna radiators, while another part of the frame may not be used as an antenna radiator, to avoid components such as mobile phone interfaces. For example, a part of the fourth frame 23 may be used as an antenna radiator, while another part of the fourth frame 23 may not be used as an antenna radiator. Those skilled in the art can design according to actual needs.

[0092] The above are only some of the embodiments and implementations of this application. The scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A foldable electronic device, characterized in that: include: A first housing, a second housing, a third housing, a main circuit board, and a flexible circuit board; the flexible circuit board includes a first flexible portion and a second flexible portion connected to each other; the first housing is rotatably connected to one side of the second housing, and the third housing is rotatably connected to a side of the second housing away from the first housing; The main circuit board is provided in the first housing; the first flexible portion is provided in the first housing and the second housing, and is electrically connected to the main circuit board; the second flexible portion is provided in the second housing and the third housing, and is electrically connected to the first flexible portion; The first housing includes a first middle frame, the second housing includes a second middle frame, and the third housing includes a third middle frame; the first middle frame is electrically connected to the main circuit board, the second middle frame is electrically connected to the first flexible portion, and the third middle frame is electrically connected to the second flexible portion; When the foldable electronic device is in a folded state, the first shell, the third shell, and the second shell are stacked in sequence along the thickness direction of the foldable electronic device, and a portion of the third middle frame is blocked by the connection between the first shell and the second shell; Another part of the third middle frame, the first middle frame and the second middle frame all form antenna radiators; surrounding the thickness direction of the foldable electronic device, the length of the first middle frame is greater than the length of the second middle frame, and the length of the first middle frame is greater than the length of another part of the third middle frame.

2. The foldable electronic device according to claim 1, wherein: The first middle frame forms a first radiator, the second middle frame forms a second radiator, and the second radiator is a parasitic branch of the first radiator; when the foldable electronic device is in a folded state, the first radiator and the second radiator are spaced apart and opposite to each other along the thickness direction of the foldable electronic device.

3. The foldable electronic device according to claim 2, wherein: The first middle frame includes a first frame, a second frame, and a third frame. The first frame and the second frame are located at opposite ends of the first shell along the length direction. The two ends of the third frame are respectively connected to the first frame and the second frame. The first frame, the second frame, and the third frame can each form at least one first radiator. The second middle frame includes a fourth frame and a fifth frame, and the fourth frame and the fifth frame are located at opposite ends of the second shell along the length direction; the fourth frame and the fifth frame can each form at least one second radiator; When the foldable electronic device is in a folded state, along a thickness direction of the foldable electronic device, the first frame and the fourth frame are spaced apart from each other, and the second frame and the fourth frame are spaced apart from each other.

4. The foldable electronic device according to claim 3, wherein: When the foldable electronic device is in a folded state, along a thickness direction of the foldable electronic device, a projection of the second radiator on the first middle frame at least partially overlaps with the first radiator.

5. The foldable electronic device according to claim 3, wherein: The third middle frame forms a third radiator, which is a parasitic branch of the first radiator. When the foldable electronic device is in a folded state, the third radiator and the first radiator are spaced apart and opposite to each other along the thickness direction of the foldable electronic device.

6. The foldable electronic device according to claim 5, characterized in that: The third middle frame includes a sixth frame and a seventh frame, and the sixth frame and the seventh frame are located at opposite ends of the third shell along the length direction; the sixth frame and the seventh frame can each form at least one third radiator; When the foldable electronic device is in a folded state, along a thickness direction of the foldable electronic device, the sixth frame and the fourth frame are spaced apart from each other, and the seventh frame and the fifth frame are spaced apart from each other.

7. The foldable electronic device according to claim 6, wherein: When the foldable electronic device is in a folded state, along the thickness direction of the foldable electronic device, the projection of the third radiator on the first middle frame at least partially overlaps with the first radiator.

8. The foldable electronic device according to claim 1, wherein: The first middle frame forms a first radiator, and the second middle frame forms a second radiator. When the foldable electronic device is in a folded state, the first radiator and the second radiator are spaced apart and opposite to each other along the thickness direction of the foldable electronic device. The first radiator supports signals of a first frequency band, and the second radiator supports signals of a second frequency band.

9. The foldable electronic device according to claim 8, wherein: The third middle frame forms a third radiator. When the foldable electronic device is in a folded state, the first radiator, the third radiator and the second radiator are spaced apart and opposite to each other in sequence along the thickness direction of the foldable electronic device. The third radiator is a parasitic branch of the first radiator, or the third radiator is a parasitic branch of the second radiator.

10. The foldable electronic device according to claim 8, wherein: The first middle frame forms a first radiator, and the third middle frame forms a third radiator. When the foldable electronic device is in a folded state, the third radiator and the first radiator are spaced apart and opposite to each other along the thickness direction of the foldable electronic device. The first radiator supports signals in a first frequency band, and the third radiator supports signals in a third frequency band.

11. The foldable electronic device according to any one of claims 1 to 10, characterized in that: The third housing includes a first portion and a second portion fixedly connected along a width direction of the foldable electronic device, wherein the thickness of the first portion is greater than the thickness of the second portion along a thickness direction of the foldable electronic device, and the first portion and the second portion enclose a storage space; The first part is rotatably connected to the second shell at a side away from the second part; When the foldable electronic device is in a folded state, the first shell is located in the storage space and stacked on the second part.

12. The foldable electronic device according to claim 11, wherein: The sum of the thicknesses of the first shell and the second portion is equal to the thickness of the first portion.

13. The foldable electronic device according to any one of claims 1 to 10, characterized in that: The foldable electronic device also includes a camera, which is arranged in the first shell and electrically connected to the main circuit board.

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