Flexible circuit board and electronic equipment

Abstract

The invention provides a flexible circuit board and electronic equipment, the flexible circuit board comprises at least one movable section arranged along the length direction of the flexible circuit board, the at least one movable section is provided with a separation groove, the separation groove divides the movable section into a first part and a second part, the separation groove can absorb the deformation generated when the flexible circuit board is bent, and the flexible circuit board is more flexible. And the first part and the second part are completely separated and do not influence each other, so that the deformation of the first part and the second part can be weakened, the overall arching degree of the flexible circuit board is reduced, the pressure of the flexible circuit board on adjacent devices is reduced, and the problems of pressing abnormal sound, film printing and the like of the electronic equipment are solved.

Description

Technical Field

[0001] The present application relates to the field of electronic equipment, and in particular to a flexible circuit board and electronic equipment. Background Art

[0002] A through-axis FPC (Flexible Printed Circuit) is usually provided in a foldable electronic device. The through-axis FPC is used to pass through the shaft and connect the devices in the middle frame on both sides of the shaft to realize new signal transmission between the devices in the middle frames on both sides.

[0003] Since there are errors in the production and installation of components in electronic equipment, it is usually necessary to reserve a certain amount of redundant length for the through-axis FPC to compensate for the errors of these components and meet the bending requirements of the through-axis FPC. However, under the condition that the components are well installed, the redundant length of the through-axis FPC cannot be effectively utilized. On the contrary, the through-axis FPC has the phenomenon of accumulation, bending, and arching. In severe cases, the through-axis FPC will cling to and squeeze the adjacent components, causing problems such as abnormal pressing noise. Summary of the invention

[0004] The present application provides a flexible circuit board and an electronic device, wherein the flexible circuit board can solve the problems of redundant warping and abnormal pressing noise caused by extrusion components.

[0005] On the one hand, the present application provides a flexible circuit board for installation in an electronic device, wherein the flexible circuit board includes at least one movable segment arranged along the length direction of the flexible circuit board, and the movable segment can move in the electronic device; wherein at least one movable segment is provided with a separation groove, and along the width direction of the flexible circuit board, the separation groove separates the movable segment into a first part and a second part.

[0006] The flexible circuit board provided by the present application includes at least one active segment arranged along its length direction. A separation groove is provided on the at least one active segment, and the separation groove is used to separate the active segment into a first part and a second part along the width direction of the flexible circuit board. The separation groove can absorb the deformation generated when the flexible circuit board is bent, and the first part and the second part are completely separated and do not affect each other, which can weaken the deformation of the first part and the second part, reduce the overall arching degree of the flexible circuit board, and reduce the pressure of the flexible circuit board on adjacent devices, thereby improving the problems of abnormal pressing noise and film printing of electronic equipment.

[0007] In a possible implementation, the first portion is an integral portion, and at least a portion of the second portion is a multi-layer segment, the multi-layer segment includes at least two structural layers arranged along the thickness direction of the flexible circuit board, and the structural layers are separated from each other.

[0008] By designing the first part as an integral part and designing at least part of the second part as a multi-layer area, the multi-layer area includes at least two structural layers stacked in sequence and separated from each other. The separation groove completely separates the first part from the second part, the first part has a slightly larger overall hardness and better ability to resist deformation, which can reduce the degree of arching. The second part has a smaller hardness and higher softness due to the multi-layer area. The existence of air layers between the structural layers of the multi-layer area has a smaller pressure on adjacent devices, which can reduce the overall deformation of the flexible circuit board and reduce the pressure of the flexible circuit board on adjacent devices.

[0009] In a possible implementation, at least part of the radio frequency signal lines in the flexible printed circuit board are distributed in the first part.

[0010] By setting part or even all of the RF signal lines in the first part, which is an integrated part, the performance of the RF signal lines can be guaranteed, avoiding RF signal loss, which helps to improve the communication efficiency and call quality of electronic equipment.

[0011] In a possible implementation manner, the separation groove includes a main groove section, an extension direction of the main groove section forms an angle with a width direction of the flexible circuit board, and the main groove section extends to both ends of the movable section.

[0012] By providing a main groove section having an angle with the width direction of the flexible circuit board, the main groove section is extended to both ends of the active section, and the active section is divided into a first part and a second part by the main groove section.

[0013] In a possible implementation, two sides of the flexible circuit board in a width direction are respectively a first side and a second side, the main groove section is close to the first side, and the first portion is located between the first side and the main groove section.

[0014] By making the main groove section of the separation groove close to the first side of the flexible circuit board and the first part being located on the side where the first side of the flexible circuit board is located, the first part occupies a smaller width, thereby avoiding excessive hardness of the first part, ensuring the overall bending performance of the active section, and reducing the top force of the first part on the adjacent device.

[0015] In a possible implementation, at least a portion of the main slot section extends along the length direction of the flexible printed circuit board.

[0016] By extending the main groove section along the length direction of the flexible circuit board, the main groove section occupies a very small space in the width direction of the flexible circuit board, and has less interference with the routing path of the wiring in the flexible circuit board. The wiring in the flexible circuit board can be kept uniform, signal interference can be reduced, and the signal transmission performance of the flexible circuit board can be improved.

[0017] In a possible implementation, the dividing groove further includes at least one branch groove section, and the branch groove section intersects and communicates with the main groove section.

[0018] By arranging the branch groove section to cross and connect with the main groove section, the area of ​​the separation groove is increased, and because the branch groove section and the main groove section have an intersection, the ability of the separation groove to absorb the bending deformation of the active section is enhanced, which can better release the stress of the active section, reduce the arching degree of the active section, and reduce the top force of the active section on the adjacent device.

[0019] In a possible implementation, the branch slot section is located in the second portion, one end of the branch slot section is connected to the main slot section, and the other end of the branch slot section extends in a direction away from the main slot section.

[0020] By arranging the branch slot section in the second part, one end of the branch slot section is connected with the main slot section, and the branch slot section does not occupy the space of the first part, so as to avoid causing the first part to be partially too narrow, thereby ensuring the reliability of the first part.

[0021] In a possible implementation manner, the branch slot segment is connected to the middle portion of the main slot segment.

[0022] In a possible implementation manner, the branch slot segment is connected to one end of the main slot segment.

[0023] In a possible implementation, the main slot segment is an arc segment, and the branch slot segment extends along a tangent direction of the main slot segment.

[0024] In a possible implementation manner, at least one movable section provided with a separation groove is a bending section, and the bending section is bent toward the side where the first portion is located.

[0025] By opening a dividing groove in the movable section formed into a bending section, the dividing groove separates one side where the corner part of the bending section is located to form a first part. The dividing groove can absorb the bending deformation of the corner part. By setting the first part as an integral part, that is, setting the corner part as an integral part, and keeping a certain hardness of the corner part, the arch degree of the corner part is reduced.

[0026] In a possible implementation manner, a crack-stopping groove is provided at a corner portion of the bending section, and an extended shape of the main groove section matches the shape of the crack-stopping groove.

[0027] In a possible implementation, the flexible circuit board further includes at least two fixing portions, each of which is arranged at intervals along the length direction of the flexible circuit board, the fixing portions are used to be fixedly connected to components of the electronic device, and the movable section is located between adjacent fixing portions.

[0028] By setting the fixing parts at intervals along the length direction of the flexible circuit board, the fixing parts are used to fix the corresponding sections of the flexible circuit board in the electronic device to fix the position of the entire flexible circuit board. Among them, at least the two ends of the flexible circuit board are fixing parts, and the fixing parts at the two ends of the flexible circuit board are used to connect with the corresponding devices.

[0029] In a possible implementation, the at least two fixing portions include two end fixing portions and at least one middle fixing portion, the two end fixing portions are respectively located at two ends of the flexible circuit board, the end fixing portions are used to connect to the components in the electronic device, and the middle fixing portion is located between the two end fixing portions;

[0030] Wherein, a separation groove is provided in a movable section between at least one end fixing portion and an adjacent middle fixing portion.

[0031] The active section between the end fixing portion and the adjacent middle fixing portion is close to the end of the flexible circuit board. The active space of the active section close to the end of the flexible circuit board is limited, and the spacing between the active section in this area and the adjacent devices is smaller. By opening a separation groove in the active section in this area, the arching degree of the active section in this area is weakened, the interference between the active section in this area and the adjacent devices is improved, and the problems of abnormal pressing noise, film printing, etc. of electronic equipment are improved.

[0032] In a possible implementation, in the movable section provided with the separation groove and located between the end fixing section and the middle fixing section, the two side areas in the second section are multi-layer sections and the middle area is an integral section.

[0033] In a possible implementation manner, the movable section between adjacent intermediate fixing portions is a multi-layer section.

[0034] The movable space of the movable segment between adjacent intermediate fixing parts is usually larger, which can meet the deformation space requirements of the movable segment. Therefore, the movable segment as a whole can be designed as a multi-layer segment, which can make the movable segment softer and reduce the pushing force of the movable segment on the adjacent device.

[0035] In a possible implementation, along the extension direction of the main slot segment, the main slot segment includes a first segment, a middle segment, and a second segment connected in sequence, and the maximum width of the first segment and the maximum width of the second segment are both smaller than the minimum width of the middle segment.

[0036] By making the maximum width of the first section and the maximum width of the second section of the main groove section smaller than the minimum width of the middle section, the main groove section is designed to be wide in the middle and narrow at both ends, thereby increasing the width of the middle area of ​​the main groove section, enhancing the ability of the main groove section to absorb the bending deformation of the active section, and being able to better release the stress of the active section and reduce the arching degree of the active section.

[0037] In a possible implementation manner, the width of the main slot section gradually decreases from the center of the main slot section to the edge of the main slot section.

[0038] Based on the structure that the main slot section is wide in the middle and narrow at both ends, by gradually changing the width of the main slot section, step differences at the connection between the first section and the middle section and at the connection between the second section and the middle section are avoided, thereby avoiding reliability problems such as local tearing and breaking caused by the step differences.

[0039] In a possible implementation manner, the separation groove runs through both side surfaces of the flexible circuit board in the thickness direction.

[0040] By making the separation groove penetrate the two side surfaces of the flexible circuit board in the thickness direction, the separation groove completely separates the first part and the second part, and the bending and deformation of the first part and the second part are completely unaffected. The influence of the harder first part on the multi-layer section of the second part can be completely isolated, so that the multi-layer section of the second part can give full play to its soft characteristics.

[0041] In a possible implementation, in the thickness direction of the flexible circuit board, the movable section is bent toward a first direction;

[0042] Along the first direction, the multi-layer segment includes a bottom layer and at least one stacked layer stacked on the bottom layer, the separation groove runs through each stacked layer, and the bottom layer is connected to the first portion.

[0043] By connecting the bottom layer of the multi-layer segment with the first part, the separation groove only passes through the various stacked layers of the multi-layer segment. Among the various structural layers of the multi-layer segment, only the movement of the bottom layer is affected by the first part, and the first part can also reduce the arching degree of the bottom layer. The various stacked layers of the multi-layer segment can still move freely, which can ensure that the multi-layer segment can give full play to its soft characteristics and reduce the top force of the multi-layer segment on adjacent devices.

[0044] On the other hand, the present application provides an electronic device, including a housing assembly and the flexible circuit board as described above, wherein the flexible circuit board is located in the housing assembly, and the flexible circuit board is connected to at least two devices in the housing assembly.

[0045] The electronic device provided by the present application includes a shell assembly and a flexible circuit board installed in the shell assembly. The flexible circuit board includes at least one movable segment arranged along its length direction. A separation groove is provided on the at least one movable segment, and the separation groove is used to separate the movable segment into a first part and a second part along the width direction of the flexible circuit board. The separation groove can absorb the deformation generated when the flexible circuit board is bent, and the first part and the second part are completely separated and do not affect each other, which can weaken the deformation of the first part and the second part, reduce the overall arching degree of the flexible circuit board, and reduce the pressure of the flexible circuit board on adjacent devices, thereby improving the problems of abnormal pressing noise, film printing, etc. of the electronic device.

[0046] In a possible implementation, the housing assembly includes a first middle frame, a second middle frame and a rotating shaft, and the first middle frame and the second middle frame are movably connected to two sides of the rotating shaft respectively;

[0047] The first end of the flexible circuit board is connected to the device installed on the first middle frame, and the second end of the flexible circuit board passes through the rotating shaft and is connected to the device installed on the second middle frame.

[0048] In a possible implementation, the electronic device further includes a first display screen, and the first display screen is mounted on the first middle frame and the first side of the second middle frame.

[0049] In a possible implementation, the electronic device further includes a second display screen, which is mounted on a second side of the second middle frame, and the second side is opposite to the first side;

[0050] Wherein, a separation groove is arranged at the movable section close to the second end of the flexible circuit board.

[0051] By providing a separation groove on the active segment near the second end of the flexible circuit board, the degree of arching of the active segment near the second end of the flexible circuit board is reduced, the interference between the active segment and the second display screen is improved, the pressing force of the active segment on the second display screen is reduced, and even the active segment is prevented from contacting the second display screen, so as to improve the problems of abnormal pressing sound and film printing on the second display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0053] Figure 2 for Figure 1 an exploded structural diagram of the electronic device shown;

[0054] Figure 3 A schematic diagram of the structure of another electronic device provided in an embodiment of the present application;

[0055] Figure 4 for Figure 3 A schematic diagram of the structure of the electronic device in the unfolded state;

[0056] Figure 5 for Figure 3 A schematic diagram of the structure of the electronic device in a folded state;

[0057] Figure 6 for Figure 3 An exploded diagram of the electronic equipment in the

[0058] Figure 7 A schematic diagram of an electrical connection structure of a foldable electronic device provided in an embodiment of the present application;

[0059] Figure 8 A partial structural diagram of a foldable electronic device provided in an embodiment of the present application;

[0060] Fig. 9 It is a schematic diagram of the installation condition of the flexible circuit board;

[0061] Fig.10 It is a structural schematic diagram of a flexible circuit board in the related art;

[0062] Fig.11 A schematic diagram of the structure of a flexible circuit board provided in an embodiment of the present application;

[0063] Fig.12 for Fig.11 A schematic diagram of the structure of the flexible circuit board in the unfolded state;

[0064] Fig.13 for Fig.12 Schematic diagram of the cross section at AA in the middle;

[0065] Fig.14 A partial enlarged view of another flexible circuit board provided in an embodiment of the present application at the location of the separation groove;

[0066] Fig.15 A schematic diagram of the structure of a third flexible circuit board in an unfolded state provided in an embodiment of the present application;

[0067] Fig.16 A schematic diagram of the structure of a fourth flexible circuit board in an unfolded state provided in an embodiment of the present application;

[0068] Fig.17 This is a schematic structural diagram of a fifth flexible circuit board in an unfolded state provided in an embodiment of the present application. DETAILED DESCRIPTION

[0069] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0070] The embodiment of the present application provides an electronic device, which can be a consumer electronic product. Exemplarily, the electronic device includes but is not limited to a mobile phone, a portable android device (PAD), a notebook computer (NoteBook Computer, referred to as NoteBook), an ultra-mobile personal computer (UMPC), a walkie-talkie, a netbook, a POS (Point of sales) machine, a personal digital assistant (PDA), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, etc.

[0071] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 1As shown, taking the electronic device 1 as a bar-type electronic device as an example, for example, the electronic device 1 is a bar-type mobile phone, the electronic device 1 may include a housing assembly 100 and a display screen 200. One side surface of the display screen 200 is used to display image information, and this side surface of the display screen 200 is usually defined as its front side, and the other side surface opposite to its front side is its back side. The housing assembly 100 is arranged around the side and back side of the display screen 200 to support and fix the display screen 200 and provide protection. The front side of the display screen 200 is exposed outside the housing assembly 100, so that the user can view the content displayed on the display screen 200 or perform input operations on the electronic device 1.

[0072] Taking the straight-type electronic device shown in the figure as an example, the display screen 200 of the electronic device 1 may be a rigid screen, and the display screen 200 may be an LCD (Liquid Crystal Display) display screen or an OLED (Organic Light-Emitting Diode) display screen.

[0073] Figure 2 for Figure 1 An exploded view of the electronic device is shown. Figure 2 As shown, taking a straight-type electronic device as an example, the housing assembly 100 of the electronic device 1 may include a middle frame 110 and a back cover 120, wherein the middle frame 110 is connected between the display screen 200 and the back cover 120, the display screen 200 is supported on one side surface of the middle frame 110, and the back cover 120 is connected to the other side surface of the middle frame 110. The display screen 200 is usually mounted on the middle frame 110 as a whole to ensure the strength and stability of the display screen 200 and meet the use requirements of the display screen 200. The back cover 120 is usually connected to the middle frame 110 in an overlapping manner, and the middle frame 110 and the back cover 120 together form a receiving cavity, and the receiving cavity is used to install components such as a circuit board 300, a battery 400, a camera 500, and a microphone (not shown in the figure).

[0074] The middle frame 110 may include a middle plate portion 111 and a frame portion 112. The middle plate portion 111 is located between the display screen 200 and the back cover 120, and is usually arranged parallel to the display screen 200 and the back cover 120. The frame portion 112 is arranged around the periphery of the middle plate portion 111. The frame portion 112 may, for example, extend perpendicular to the plate surface of the middle plate portion 111 to both sides of the middle plate portion 111. Exemplarily, the frame portion 112 and the middle plate portion 111 may be an integrally formed structure.

[0075] The display screen 200 is usually mounted on the middle plate portion 111 of the middle frame 110 in an integrally bonded manner. For example, the display screen 200 is bonded to the middle plate portion 111 as a whole. The support of the middle plate portion 111 on the display screen 200 can ensure that the display screen 200 is supported stably and firmly, so that the display screen 200 has sufficient strength to meet the use requirements of the display screen 200 being frequently pressed. The frame portion 112 is arranged around the side of the display screen 200 to protect the side of the display screen 200, help the display screen 200 resist risk scenarios such as collision and falling, and protect the display screen 200 from damage.

[0076] The edge of the back cover 120 is connected to the frame portion 112 of the middle frame 110, for example, the edge of the back cover 120 is bonded to the frame portion 112. There is a gap between the middle plate portion 111 of the middle frame 110 and the back cover 120, and the gap forms a receiving cavity as described above, so that a device can be installed in the receiving cavity between the middle plate portion 111 of the middle frame 110 and the back cover 120.

[0077] Figure 3 A schematic diagram of the structure of another electronic device provided in an embodiment of the present application; Figure 4 for Figure 3 A schematic diagram of the structure of the electronic device in the unfolded state; Figure 5 for Figure 3 Schematic diagram of the structure of the electronic device in a folded state.

[0078] Reference Figures 3 to 5 As shown, taking the electronic device 1 as a foldable electronic device as an example, for example, the electronic device 1 is a foldable mobile phone, the electronic device 1 may include at least two parts that can rotate relative to each other, and the electronic device 1 may have different usage states in different usage scenarios. In this embodiment, taking the foldable electronic device as an electronic device 1 that can be folded once as an example, the electronic device 1 includes two parts that can rotate relative to each other, and the usage state of the electronic device 1 is changed by the relative rotation of the two parts.

[0079] The two parts of the electronic device 1 can be along Figure 3 When the two parts are rotated to overlap each other, the electronic device 1 is in a Figure 4 In the folded state shown in FIG. 1 , the electronic device 1 is small in size and easy to carry; the two parts of the electronic device 1 can also be moved along the same Figure 3 The electronic device 1 is in a state where the two parts rotate relative to each other in the direction opposite to the direction of the arrows in the figure. When the two parts rotate to be coplanar, the electronic device 1 is in a state where the two parts rotate relative to each other in the direction opposite to the direction of the arrows in the figure. Figure 5 In the unfolded state shown in FIG, the unfolding angle α of the electronic device 1 is, for example, 180°, at which time the electronic device 1 can realize a large screen display; in some cases, the electronic device 1 can also be kept in a semi-expanded state (see Figure 3As shown), at this time, the electronic device 1 is suspended at a certain angle between the unfolded state and the folded state. Exemplarily, the suspension angle β of the electronic device 1 can be 120°, 130°, 140° or 150°, etc.

[0080] It should be noted that the angles illustrated in this embodiment are all allowed to have a slight deviation. For example, the unfolding angle α of the electronic device 1 is 180°, which means that the unfolding angle α can be 180°, or about 180°, such as 170°, 175°, 185° or 190°. The angles illustrated in the following text can be understood in the same way.

[0081] In addition, in addition to the electronic device 1 that can be folded once, the electronic device 1 can also be an electronic device 1 that can be folded more than twice. In this case, the electronic device 1 can include multiple parts that are connected by rotating in sequence, and two adjacent parts can be relatively close to each other to be folded to a folded state, and the two adjacent parts can also be relatively far apart to be unfolded to an unfolded state.

[0082] Figure 6 for Figure 3 Exploded diagram of the electronic equipment in the . Figure 6 As shown, for a foldable electronic device, the electronic device 1 may also include a display screen 200 and a shell assembly 100. The front of the display screen 200 is used to display image information. The shell assembly 100 is arranged around the sides and back of the display screen 200 to support and fix the display screen 200 and provide protection, which will not be repeated here.

[0083] The display screen 200 of the foldable electronic device may include a foldable first display screen 200a, and the first display screen 200a may include a first area 210, a second area 220, and a bendable area 230, wherein the bendable area 230 is located between the first area 210 and the second area 220. During use of the electronic device 1, the first area 210 and the second area 220 always maintain a planar state, and the bendable area 230 may be bent to change the angle between the first area 210 and the second area 220, so that the first display screen 200a is folded or unfolded with the movement of the housing assembly 100, so that the electronic device 1 can be switched between a folded state and an unfolded state.

[0084] Exemplarily, in the first display screen 200a, at least the bendable area 230 is made of a flexible material so that the bendable area 230 is bendable. The first area 210 and the second area 220 can be made of a flexible material, or a rigid material, or partially made of a rigid material and partially made of a flexible material, which is not limited in this embodiment.

[0085] The first display screen 200a includes but is not limited to an organic light-emitting diode (OLED) display screen, an active-matrix organic light-emitting diode or an active-matrix organic light-emitting diode (AMOLED) display screen, a mini organic light-emitting diode (MID) display screen, a micro organic light-emitting diode (MID) display screen, a micro organic light-emitting diode (MID) display screen, or a quantum dot light emitting diode (QLED) display screen, etc.

[0086] Among them, combined Figure 4 and Figure 6 As shown, when the first display screen 200a is in a folded state, the first area 210 and the second area 220 are relatively stacked, and the bendable area 230 is in a bent state. The bending angle of the bendable area 230 is, for example, 180°. At this time, the electronic device 1 is small in size and easy to carry and store. Figure 5 and Figure 6 As shown, when the first display screen 200a is in the unfolded state, the first area 210 and the second area 220 are in a relatively far unfolded state, the bendable area 230 is in a flattened state without bending, and the first area 210, the second area 220 and the bendable area 230 face the same direction and are in a coplanar state. At this time, the angle between the first area 210 and the second area 220 is 180°, and the first display screen 200a can achieve large-screen display, giving users a better user experience.

[0087] It should be noted that the figure takes the foldable electronic device as an inner foldable structure as an example. When the electronic device 1 is in the folded state, the first area 210 and the second area 220 of the first display screen 200a are relatively fitted, and the housing assembly 100 is arranged outside the first display screen 200a to prevent the first display screen 200a from being scratched by hard objects. Figure 4 If the inward-folding electronic device needs to realize the display function in the folded state, a second display screen 200b can be added to the back of the shell assembly 100. When the electronic device 1 is in the folded state, the display function is realized by the second display screen 200b.

[0088] In other words, the display screen 200 of the inward-folding electronic device may include a first display screen 200a and a second display screen 200b. The first display screen 200a may be a folding screen installed on the front of the shell assembly 100, and the first display screen 200a may be switched between an unfolded state and a folded state. The second display screen 200b may be a single screen installed on the back of the shell assembly 100, and the second display screen 200b is displayed when the electronic device 1 is in a folded state.

[0089] In other examples, the foldable electronic device may also be an external foldable structure. When the electronic device 1 is in the folded state, the first area 210 and the second area 220 of the first display screen 200a are opposite to each other, the housing assembly 100 is located between the first area 210 and the second area 220, and the first display screen 200a is surrounded outside the housing assembly 100. The first display screen 200a is exposed to the outside and visible to the user. The first display screen 200a can be used to realize the display function, so there is no need to add the second display screen 200b on the back of the housing assembly 100. In other words, the external foldable electronic device may only include the first display screen 200a installed on the front of the housing assembly 100.

[0090] In addition, combined Figure 3 and Figure 6 As shown, in some embodiments, the foldable electronic device, especially the inward-folding electronic device, can rely on the damping force provided by the housing assembly 100 to make the electronic device 1 hover at a certain angle between the unfolded state and the folded state, that is, the electronic device 1 is in a semi-expanded state, at which time, the bendable area 230 of the first display screen 200a is also in a bent state, and the first area 210 and the second area 220 of the first display screen 200a are relatively inclined. For example, the hovering angle of the electronic device 1 is 120°, 130°, 140° or 150°, etc., and accordingly, the angle between the first area 210 and the second area 220 can be 120°, 130°, 140° or 150°, etc.

[0091] For a foldable electronic device, the housing assembly 100 not only supports and fixes the first display screen 200a, but also needs to drive the first display screen 200a to switch between a folded state and an unfolded state. Figure 6 As shown, the housing assembly 100 of the foldable electronic device may include a first middle frame 110a, a second middle frame 110b and a hinge 130, wherein the hinge 130 is connected between the first middle frame 110a and the second middle frame 110b, and the first middle frame 110a and the second middle frame 110b are rotatably connected via the hinge 130, thereby realizing relative rotation between the first middle frame 110a and the second middle frame 110b.

[0092] The first middle frame 110a supports and fixes the first area 210 of the first display screen 200a, and the second middle frame 110b supports and fixes the second area 220 of the first display screen 200a. In other words, the first area 210 of the first display screen 200a can be mounted on the first middle frame 110a, and the second area 220 of the first display screen 200a can be mounted on the second middle frame 110b. The bendable area 230 of the first display screen 200a is arranged corresponding to the rotating shaft 130. When the rotating shaft 1301 drives the first middle frame 110a and the second middle frame 110b to rotate relative to each other, the first area 210 and the second area 220 of the first display screen 200a change their orientation accordingly, and the bendable area 230 of the first display screen 200a bends or flattens as the orientation of the first area 210 and the second area 220 changes.

[0093] Specifically, the first middle frame 110a and the second middle frame 110b can be rotated in a direction close to each other until the two are relatively stacked. At this time, the housing assembly 100 is in a folded state, and the first display screen 200a is in a folded state along with the folding of the housing assembly 100. Figure 4 As shown; the first middle frame 110a and the second middle frame 110b can also be rotated in a direction away from each other until the two are coplanar. At this time, the housing assembly 100 is in an unfolded state, and the first display screen 200a is in an unfolded state with the unfolding of the housing assembly 100, as shown Figure 5 As shown; the first middle frame 110a and the second middle frame 110b can also rotate relative to each other until they stay between the folded state and the unfolded state. At this time, the shell assembly 100 is in a semi-expanded state (hovering state), and the angle between the first middle frame 110a and the second middle frame 110b is, for example, 120°, 130°, 140° or 150°, etc., and the first display screen 200a is in a semi-expanded state with the shell assembly 100.

[0094] Continue to refer to Figure 6 As shown, in this embodiment, the two opposite sides of the first middle frame 110a and the second middle frame 110b are defined as the first side and the second side of the two, respectively, and the first display screen 200a can be integrally mounted on the first side of the first middle frame 110a and the second middle frame 110b. For an inward-folding electronic device with an additional second display screen 200b, taking the second display screen 200b mounted on the side where the second middle frame 110b is located as an example, the second display screen 200b can be installed on the second side of the second middle frame 110b, and the housing assembly 100 further includes a first back cover 120a, and the first back cover 120a is connected to the second side of the first middle frame 110a. For an outward-folding electronic device or an inward-folding electronic device without an additional second display screen 200b, the electronic device 1 may further include a first back cover 120a and a second back cover 120b, the first back cover 120a is connected to the second side of the first middle frame 110a, and the second back cover 120b is connected to the second side of the second middle frame 110b.

[0095] The first middle frame 110a and the first back cover 120a together form a first receiving cavity, the second middle frame 110b and the second display screen 200b (second back cover 120b) form a second receiving cavity, and the internal components of the electronic device 1 can be installed in the first receiving cavity and the second receiving cavity, respectively. For example, a circuit board 300 can be installed in both the first receiving cavity and the second receiving cavity, and other components such as a battery 400 and a camera 500 can also be installed in at least one of the first receiving cavity and the second receiving cavity, and these components can be installed on the first middle frame 110a and the second middle frame 110b.

[0096] Exemplarily, among the circuit boards 300 installed in the two receiving cavities, a circuit board 300 installed in the first receiving cavity (the second receiving cavity) can be the main board 310 of the electronic device 1, and the main board 310 can be provided with system-on-a-chip (SOC), memory and other devices; a circuit board 300 installed in the second receiving cavity (the first receiving cavity) can be used as a sub-board 320, and the sub-board 320 is used to set devices that cannot be integrated into the main board 310. For example, the sub-board 320 can be provided with radio frequency devices, power chips and other devices; at least one of the first receiving cavity and the second receiving cavity can also be provided with other circuit boards 300, and the other circuit boards 300 can be used to set devices such as sockets, microphones and speakers.

[0097] As for the electrical connection between the components in the electronic device 1, since certain errors are inevitable during the production and installation of the components, in order to eliminate the influence of the errors of the components and ensure reliable connection between the components, a flexible circuit board 600 is usually used to connect the corresponding components with spacing, and the bendable and deformable properties of the flexible circuit board 600 are utilized to meet the requirements of the spacing, relative position, etc. of the component installation.

[0098] Taking a straight-type electronic device as an example, a camera 500 and a circuit board 300 (sub-board 320) integrated with a microphone and a speaker can be electrically connected to a circuit board 300 (main board 310) integrated with a system-level chip, a memory and other devices by using a flexible circuit board 600. Figure 7As shown in the figure, the electrical connection structure of a foldable electronic device is shown. Taking a foldable electronic device as an example, a flexible circuit board 600 can be used to realize the electrical connection between the device in the first receiving cavity and the device in the second receiving cavity. The first end of the flexible circuit board 600 can be connected to the main board 310 (sub-board 320) mounted on the first middle frame 110a, and the second end of the flexible circuit board 600 can be connected to the sub-board 320 (main board 310) mounted on the second middle frame 110b. Although not shown in the figure, it should be understood that other related devices in each receiving cavity (such as a camera 500 and other circuit boards 300 provided with devices such as sockets, microphones and speakers) can also be electrically connected to the main board 310 (sub-board 320) in the receiving cavity through the flexible circuit board 600.

[0099] Regardless of whether it is a straight-type electronic device or a foldable electronic device, the flexible circuit board 600 in the electronic device 1 usually reserves a certain redundant length to compensate for errors in the production and installation of related components to ensure that the components are connected stably and reliably.

[0100] Figure 8 This is a partial structural diagram of a foldable electronic device provided in an embodiment of the present application. Figure 8 As shown in the figure, taking a foldable electronic device as an example, a structure in which a flexible circuit board 600 is connected to one of the two relatively rotating parts of the electronic device 1 is shown. Taking the part shown in the figure as the side where the second middle frame 110b is located as an example, the second end of the flexible circuit board 600 is connected to the device (such as the sub-board 320 or the main board 310) installed on the second middle frame 110b, and the first end of the flexible circuit board 600 passes through the rotating shaft 130 and is connected to the device (such as the main board 310 or the sub-board 320) on the first middle frame 110a (combined Figure 7 shown).

[0101] Exemplarily, both ends of the flexible circuit board 600 can be connected to the devices installed on the first middle frame 110a and the second middle frame 110b through a BTB (Board to Board) connector. For example, both ends of the flexible circuit board 600 are mounted with the female socket of the BTB connector 700, and the main board 310 installed on the first middle frame 110a (second middle frame 110b) and the sub-board 320 installed on the second middle frame 110b (first middle frame 110a) are mounted with the male socket of the BTB connector 700 (combined with the male socket of the BTB connector 700). Figure 7 As shown), the female socket of the BTB connector 700 is plugged into the male socket of the BTB connector 700 to electrically connect the main board 310 and the sub-board 320 through the flexible circuit board 600.

[0102] Among them, the flexible circuit board 600 has at least two fixing parts 610, and each fixing part 610 can be arranged at intervals along the length direction of the flexible circuit board 600. The fixing part 610 is fixedly connected inside the electronic device 1 to fix the overall position of the flexible circuit board 600, realize the connection between the flexible circuit board 600 and related devices, and ensure the stability and reliability of the flexible circuit board 600.

[0103] The section of the flexible circuit board 600 between adjacent fixed parts 610 is an active section 620, which can move inside the electronic device 1. The active section 620 is used to allow the flexible circuit board 600 to have space for deformation and displacement, so as to realize the function of the flexible circuit board 600 to compensate for device errors. Moreover, for the flexible circuit board 600 used in a foldable electronic device, the redundant length provided by the active section 620 is used to compensate for the active space of the flexible circuit board 600, so as to realize the extension or contraction of the flexible circuit board 600 as the state of the electronic device 1 changes.

[0104] Continue to refer to Figure 8 It can be understood that at least two ends of the flexible circuit board 600 (in the length direction) have a fixing portion 610. For the convenience of explanation, the fixing portion 610 located at the end of the flexible circuit board 600 is defined as an end fixing portion 611 in this embodiment. The end fixing portions 611 at both ends of the flexible circuit board 600 are respectively used to connect with corresponding devices. Taking the connection of the two ends of the flexible circuit board 600 with the corresponding devices through the BTB connector 700 as an example, the female socket of the BTB connector 700 can be mounted on the end fixing portions 611 at both ends of the flexible circuit board 600.

[0105] For a foldable electronic device, since the flexible circuit board 600 needs to pass through the rotating shaft 130 between the first middle frame 110a and the second middle frame 110b, the length of the flexible circuit board 600 is relatively large. In addition to the end fixing portions 611 at both ends of the flexible circuit board 600, at least one fixing portion 610 may be provided between the two ends of the flexible circuit board 600. For ease of explanation, the present embodiment defines the fixing portion 610 provided between the two ends of the flexible circuit board 600 as an intermediate fixing portion 612. The intermediate fixing portion 612 is used to assist in positioning the section between the two ends of the flexible circuit board 600 and to separate the active segment 620 of the flexible circuit board 600, so as to avoid stacking, entanglement, wear, jamming and other problems of the flexible circuit board 600 due to the excessive length of the active segment 620, so as not to affect the reliability and service life of the flexible circuit board 600, and also to prevent the activity of the electronic device 1 from being affected.

[0106] For example, refer to Figure 8Three intermediate fixing portions 612 may be arranged between the two end fixing portions 610 at the two ends of the flexible circuit board 600. Among the three intermediate fixing portions 612, the intermediate fixing portion 612 located in the middle may be aligned with the rotating shaft 130 (in the width direction, Figure 7 The intermediate fixing part 612 is fixedly connected to the center part of the flexible circuit board 600 (in the X direction), and the intermediate fixing part 612 can play the role of positioning the flexible circuit board 600 as a whole. The intermediate fixing parts 612 on both sides can be respectively connected to the two sides of the width direction of the rotating shaft 130. The intermediate fixing parts 612 on both sides and the movable section 620 between the intermediate fixing parts 612 in the middle provide sufficient redundant length for the flexible circuit board 600 to meet the length requirements of the electronic device 1 for the flexible circuit board 600 in different states. In addition, the movable section 620 between the intermediate fixing parts 612 on both sides and the end fixing parts 611 at the corresponding ends can also have a certain redundant length to compensate for the assembly error between the flexible circuit board 600 and the corresponding device.

[0107] Taking a straight-type electronic device as an example, when the spacing between two devices connected to the flexible circuit board 600 is small and the overall length of the flexible circuit board 600 is small, the flexible circuit board 600 can be provided with fixed parts 610 only at its two ends. In other words, the flexible circuit board 600 has end fixing parts 611 only at both ends, and all sections between the two ends of the flexible circuit board 600 are active sections 620; when the spacing between the two devices connected to the flexible circuit board 600 is large and the overall length of the flexible circuit board 600 is large, in addition to the two end fixing parts 610 at both ends of the flexible circuit board 600, at least one intermediate fixing part 612 can be provided between the two ends of the flexible circuit board 600, and the intermediate fixing part 612 separates at least two active sections 620 to limit the range of movement of the flexible circuit board 600 and improve the reliability of the flexible circuit board 600, which will not be repeated here.

[0108] Exemplarily, a support sheet (not shown in the figure) can be mounted on the surface of one side of these intermediate fixing parts 612 facing the device (such as the rotating shaft 130). The support sheet is, for example, a metal sheet such as an iron sheet, an aluminum sheet, or a copper sheet. The intermediate fixing parts 612 are fixedly connected to the corresponding parts of the corresponding devices by means of the support sheet.

[0109] However, whether the flexible circuit board 600 is used in a foldable electronic device or a straight-type electronic device, when the relevant devices are installed in good working conditions, the redundant length of the flexible circuit board 600 cannot be effectively utilized. On the contrary, due to the redundancy, the flexible circuit board 600 will be stacked, bent, and arched, squeezing the adjacent devices and causing problems such as abnormal noise when pressed.

[0110] The texture of the conventional flexible circuit board 600 is relatively hard. When the redundant length of the flexible circuit board 600 is too large, the flexible circuit board 600 is stretched in the thickness direction of the electronic device 1 ( Figure 8 The flexible circuit board 600 is greatly bent (in the Z direction), and the surface of the flexible circuit board 600 will squeeze the devices adjacent to it. The part of the electronic device 1 squeezed by the flexible circuit board 600 is subjected to greater pressure, causing the part to produce problems such as abnormal pressing noise.

[0111] Fig. 9 This is a schematic diagram of the flexible circuit board installation conditions. Fig. 9 As shown, taking the flexible circuit board 600 used in a foldable electronic device as an example, especially for the active segments 620 near the two ends of the flexible circuit board 600, since the ends of the flexible circuit board 600 are connected to the devices in the electronic device 1, the thickness of the devices themselves (plus the thickness of the superimposed BTB connector 700) occupies more thickness space of the electronic device 1, limiting the active space of the active segment 620 in this section along the thickness direction of the electronic device 1, and the two sides of the active segment 620 squeeze the devices adjacent to it.

[0112] For example, for the movable segment 620 near the first end of the flexible circuit board 600, one side surface of the movable segment 620 presses the first rear cover 120a, and the other side surface of the movable segment 620 presses the main board 310 (sub-board 320) or the battery 400 (main battery 410) located next to the main board 310 (sub-board 320); for the movable segment 620 near the second end of the flexible circuit board 600, one side surface of the movable segment 620 presses the second display screen 200b (second rear cover 120b), and the other side surface of the movable segment 620 presses the sub-board 320 (main board 310) or the battery 400 (sub-battery 420) located next to the sub-board 320 (main board 310). In this way, the electronic device 1 may have problems such as abnormal sound when pressed, and the reliability and service life of the flexible circuit board 600 may also be affected during long-term use.

[0113] When the inward-folding electronic device is equipped with a second display screen 200b, the flexible circuit board 600 is squeezed on the second display screen 200b, causing the second display screen 200b to be subjected to greater local stress. The second display screen 200b becomes partially slightly convex and uneven, resulting in film printing defects on the second display screen 200b. Especially in the black screen state, the film printing phenomenon of the second display screen 200b is more obvious.

[0114] Of course, for the section of the flexible circuit board 600 located in the area where the hinge 130 is located, even if the movable space of the active segment 620 in this section is larger, when the redundant length of the active segment 620 is larger, the active segment 620 may squeeze the hinge 130 or the first display screen 200a when the bending degree is the largest, causing the electronic device 1 to have abnormal noise (during the switching of use status), abnormal noise when pressed, film printing and other adverse phenomena.

[0115] For the flexible circuit board 600 used in the straight-type electronic device, the movable section 620 of the flexible circuit board 600 (especially near its two ends) has limited movable space. When the redundant length of the flexible circuit board 600 is too large, the flexible circuit board 600 may squeeze the devices adjacent to it, thereby causing the electronic device 1 to make problems such as abnormal pressing sounds. Long-term use also affects the reliability and service life of the flexible circuit board 600, which will not be elaborated here.

[0116] In view of this, the embodiment of the present application improves the flexible circuit board 600 by providing a separation groove on at least one active segment 620 of the flexible circuit board 600, and utilizing the separation groove to separate the active segment 620 into a first part and a second part along the width direction of the flexible circuit board 600. The separation groove can absorb the deformation generated when the flexible circuit board 600 is bent, and the first part and the second part are completely separated and do not affect each other, which can weaken the deformation of the first part and the second part, reduce the overall arching degree of the flexible circuit board 600, and reduce the pressure of the flexible circuit board 600 on adjacent devices, thereby improving the problems of abnormal pressing noise, film printing, etc. of the electronic device 1.

[0117] The flexible circuit board 600 provided in this embodiment is described in detail below by taking the flexible circuit board 600 applied in a foldable electronic device and passing through the rotating shaft 130 as an example.

[0118] Fig.10 Schematic diagram of the structure of a flexible circuit board in the related art. Fig.10 As shown in the figure, a conventional structure of a flexible circuit board 600 is shown. As shown in the figure, a BTB connector 700 (such as a female socket) is mounted on the end fixing portions 611 at both ends of the flexible circuit board 600 to achieve the connection between the flexible circuit board 600 and the corresponding device. Three intermediate fixing portions 612 are arranged between the end fixing portions 611 at both ends of the flexible circuit board 600. As mentioned above, the three intermediate fixing portions 612 are respectively used to be fixedly connected to different parts of the rotating shaft 130.

[0119] Exemplarily, the figure shows that the end fixing portion 611 at both ends of the flexible circuit board 600 is divided into two parts, and both parts of the end fixing portion 611 are mounted with a BTB connector 700, which can realize a dual-interface connection between the end of the flexible circuit board 600 and the corresponding device to meet the functional requirements of multi-signal transmission between devices.

[0120] In the related art, the movable section 620 between the adjacent fixing parts 610 of the flexible circuit board 600 is usually an integral structure, that is, the movable section 620 is an inseparable whole-layer structure in the thickness direction. On the basis that the fixing part 610 of the flexible circuit board 600 is usually an integral structure, the flexible circuit board 600 as a whole is an inseparable one-piece structure. For a flexible circuit board 600 with a certain thickness, the hardness of the flexible circuit board 600 with an integral structure is relatively large, and the arc radius generated after the flexible circuit board 600 is bent is relatively large. When the flexible circuit board 600 contacts the electronic device 1 in the thickness direction ( Figure 8 When the adjacent components (such as the back cover 120 and the display screen 200) are pressed in the Z direction, a large top force is generated on the corresponding components, resulting in problems such as abnormal pressing sound and film printing in the electronic device 1.

[0121] Fig.11 A schematic diagram of the structure of a flexible circuit board provided in an embodiment of the present application; Fig.12 for Fig.11 A schematic diagram of the structure of the flexible circuit board in the unfolded state; Fig.13 for Fig.12 Schematic diagram of the cross section at AA in the middle.

[0122] Reference Fig.11 and Fig.12 As shown, in this embodiment, at least one of the movable segments 620 of the flexible circuit board 600 may be provided with a separation groove 623 , and the separation groove 623 avoids the wiring in the flexible circuit board 600 and has no effect on the signal transmission of the flexible circuit board 600 .

[0123] By opening a separation groove 623 in the active section 620, the separation groove 623 can absorb the bending deformation of the active section 620 caused by length redundancy, release the deformation stress of the active section 620, weaken the bending deformation of the active section 620, and improve the interference of the active section 620 with adjacent devices, thereby improving the problems of abnormal pressing sound, film printing, etc. of the electronic device 1 and improving the performance of the electronic device 1.

[0124] For the active segment 620 with the separation groove 623, the separation groove 623 separates the active segment 620 into a first portion 624 and a second portion 625 along the width direction of the active segment 620. The separation by the separation groove 623 makes it possible for the first portion 624 and the second portion 625 to not interfere with each other, and further, the specific structures of the first portion 624 and the second portion 625 can be designed respectively, so as to further improve the interference problem of the active segment 620 on the adjacent devices.

[0125] Continue to refer to Fig.11 or Fig.12 On the basis of providing a separation groove 623 in at least one active segment 620 of the flexible circuit board 600, in this embodiment, at least some of the active segments 620 of the flexible circuit board 600 are provided with a multilayer segment 621. Fig.13 As shown, the multi-layer segment 621 includes at least two structural layers 6211 arranged along the thickness direction of the flexible circuit board 600, and each structural layer 6211 is stacked along the thickness direction of the active segment 620, and each structural layer 6211 is separated from each other.

[0126] The multi-layer segment 621 separates the active segment 620 into two or more structural layers 6211 along its thickness direction, which is equivalent to two or more structural layers 6211 with small thickness constituting the entire active segment 620. Since the thickness of each structural layer 6211 is small and an air layer is formed between adjacent structural layers 6211 separated from each other, each structural layer 6211 can move without being constrained by other structural layers 6211. Furthermore, the existence of the multi-layer segment 621 reduces the hardness of the active segment 620, making the active segment 620 softer and easier to bend, which can effectively reduce the top force of the active segment 620 on the adjacent devices, and improve the problems of abnormal pressing sound and film printing of the electronic device 1.

[0127] Taking the flexible circuit board 600 applied to a foldable electronic device as an example, when the flexible circuit board 600 includes a plurality of movable segments 620, that is, when at least one intermediate fixing portion 612 is provided between the end fixing portions 611 at both ends of the flexible circuit board 600, some of the movable segments 620 may be provided with multi-layer segments 621, or all of the movable segments 620 may be provided with multi-layer segments 621. Taking the flexible circuit board 600 applied to a straight-type electronic device as an example, when the flexible circuit board 600 includes one movable segment 620, the movable segment 620 may be provided with multi-layer segments 621, and when the flexible circuit board 600 has two or more movable segments 620 arranged at intervals, at least one movable segment 620 may be provided with multi-layer segments 621.

[0128] For example, whether the flexible circuit board 600 is used in a foldable electronic device or a straight electronic device, the active segment 620 located in the middle area of ​​the flexible circuit board 600 along the length direction of the flexible circuit board 600 is usually bent to a greater extent, and thus, a multi-layer segment 621 can be provided on the active segment 620 in the middle area to ensure the bending performance of the active segment 620 in the middle area. On the basis of providing the multi-layer segment 621 on the active segment 620 in the middle area, the multi-layer segment 621 can also be provided on the active segment 620 near the end of the flexible circuit board 600. The active space of the active segment 620 near the end of the flexible circuit board 600 is usually small. By providing the multi-layer segment 621 on the active segment 620 near the end, the hardness of the active segment 620 is reduced, and the top force of the active segment 620 on the adjacent device is reduced.

[0129] Specifically, taking the example of three intermediate fixing parts 612 arranged between the end fixing parts 611 at both ends of the flexible circuit board 600, the multi-layer section 621 can be arranged only in the movable section 620 between the adjacent intermediate fixing parts 612. The area between the intermediate fixing parts 612 corresponds to the movable area of ​​the rotating shaft 130. The movable section 620 in this area has a large range of movement as the rotating shaft 130 rotates. By arranging the multi-layer section 621 in the movable section 620 in this area, the movable section 620 in this area is made softer, and the bending performance of the movable section 620 in this area is guaranteed. In addition, since the movable section 620 in this area has a large range of movement, the redundant length of the movable section 620 in this area is usually large to meet the movable requirements of the movable section 620 in this area. By arranging the multi-layer section 621 in the movable section 620 in this area, when the movable section 620 in this area squeezes the adjacent device (such as the component of the rotating shaft 130), the top force of the movable section 620 on the device can also be reduced.

[0130] In order to compensate for the errors in device manufacturing and installation, the movable section 620 between the end fixing section 611 and the adjacent middle fixing section 612 of the flexible circuit board 600 is usually designed with a certain redundant length, and because at least part of the movable section 620 in this area is supported on the mounting device (such as the circuit board 300), the movable section 620 in this area has a smaller movable space. Fig.12 and Fig.13 As shown, on the basis of setting the multi-layer segment 621 in the active segment 620 between adjacent intermediate fixing portions 612, the multi-layer segment 621 can also be set in the active segment 620 between the end fixing portion 611 and the adjacent intermediate fixing portion 612 to enhance the softness of the active segment 620 in this area and reduce the pushing force of the active segment 620 in this area on the device.

[0131] Among them, for the active section 620 between the end fixing portion 611 of the flexible circuit board 600 and the adjacent middle fixing portion 612, since the active section 620 usually only has a redundant length requirement and does not have the activity requirement of bending or unfolding with the movement of the rotating shaft 130, in the active section 620 in this area, along the length direction of the active section 620, only a part of the active section 620 can be provided with a multi-layer section 621, and the rest of the active section 620 is an integrated section 622, or the multi-layer section 621 can also occupy the entire area of ​​the active section 620.

[0132] The so-called integral section 622 means that the movable section 620 of the section is a whole in the thickness direction without layers. As for the structure of the integral section 622, in some examples, the integral section 622 can be an integrally formed structure, and the integral section 622 and the multi-layer section 621 can be formed by different molding processes, and the two are connected together; in other examples, the integral section 622 can also be composed of multiple structural layers 6211, and adjacent structural layers 6211 can be bonded together to form a whole.

[0133] Reference Fig.11 or Fig.12 As shown, exemplarily, for the active segment 620 between the end fixing portion 611 and the adjacent middle fixing portion 612 of the flexible circuit board 600, when the active segment 620 (along the length direction of the flexible circuit board 600) is narrow, along the length direction of the flexible circuit board 600, the multi-layer segment 621 can occupy the entire area of ​​the active segment 620; when the active segment 620 (along the length direction of the flexible circuit board 600) is wide, along the length direction of the flexible circuit board 600, the multi-layer segment 621 can only occupy a partial area of ​​the active segment 620, for example, the area of ​​the active segment 620 close to the fixing portion 610 on both sides is set as the multi-layer segment 621, and the middle area is set as the integral segment 622, and the active segment 620 is composed of the multi-layer segments 621 on both sides and the integral segment 622 in the middle.

[0134] It should be noted that the multi-layer segment 621 mentioned here occupying a partial area or the entire area of ​​the active segment 620 is with respect to the length direction of the flexible circuit board 600, and not with respect to the entire area of ​​the active segment 620, so as to indicate the size of the area of ​​the active segment 620 occupied by the multi-layer segment 621 in the length direction of the flexible circuit board 600.

[0135] As for the movable segment 620 provided with a dividing groove 623, the first portion 624 located on one side of the dividing groove 623 may be an integral portion, which is similar to the aforementioned integral segment 622, and is a whole without layers in the thickness direction of the movable segment 620, and at least a partial area of ​​the second portion 625 located on the other side of the dividing groove 623 is the aforementioned multi-layer segment 621.

[0136] The separation groove 623 completely separates the movable section 620 (in the width direction) into a first part 624 and a second part 625, and the first part 624 and the second part 625 do not affect each other. By designing the first part 624 as an integral part, the overall hardness of the first part 624 is slightly greater, the first part 624 has a better ability to resist deformation, and the degree of arching is smaller, which can reduce the interference between the first part 624 and the adjacent device, and even prevent the first part 624 from contacting the adjacent device to avoid squeezing the adjacent device. The second part 625 is provided with a multi-layer section 621, which reduces the hardness of the multi-layer section 621. The multi-layer section 621 has better flexibility. Without the constraint of the first part 624, the multi-layer section 621 can give full play to its soft characteristics and reduce the pressure on the adjacent device.

[0137] Therefore, by providing a separation groove 623 in the movable section 620, the separation groove 623 separates the movable section 620 into a first part 624 and a second part 625 along the width direction, and by setting the first part 624 as an integral part and setting the multilayer section 621 in the second part 625, the separation groove 623 can absorb the deformation of the movable section 620, reduce the stress generated by the deformation of the movable section 620, and reduce the overall arching degree of the movable section 620. In addition, the separation groove 623 isolates the influence between the first part 624 and the second part 625, so that the first part 624 can play the characteristics of high hardness, small arching, and small interference with adjacent devices, and the multilayer section 621 of the second part 625 can play the characteristics of high softness and small push force on adjacent devices. Therefore, the problems of abnormal pressing sound and film printing of the electronic device 1 are improved, and the use performance of the electronic device 1 is improved.

[0138] In addition, when designing the wiring structure in the flexible circuit board 600, the RF signal line can be partially or even completely distributed in the first part 624, or in other words, the position of the separation groove 623 can be set according to the distribution area of ​​the RF signal line, so that most or even all of the RF signal lines are distributed in the first part 624. By setting the first part 624 as an integral part, the performance of the RF signal line can be guaranteed, and the loss of RF signal can be avoided, which helps to improve the communication efficiency and call quality of the electronic device 1.

[0139] As for the distribution position of the separation groove 623 on the flexible circuit board 600, as mentioned above, the parts of the flexible circuit board 600 near the two ends usually have a smaller movable space, and the spacing between the movable segment 620 near the end of the flexible circuit board 600 and the adjacent device is smaller. Therefore, the separation groove 623 can be opened in the movable segment 620 between the end fixing portion 611 of the flexible circuit board 600 and the adjacent middle fixing portion 612 to reduce the degree of arching of the movable segment 620 near the end area of ​​the flexible circuit board 600, improve the interference between the movable segment 620 in this area and the adjacent device, and improve the problems of abnormal pressing sound, film printing, etc. of the electronic device 1.

[0140] Among them, Fig.11 or Fig.12 As shown, the separation groove 623 may be provided only on the active segment 620 at one end of the flexible circuit board 600. For example, the separation groove 623 may be provided on the wider active segment 620 (along the length direction of the flexible circuit board 600), while the narrower active segment 620 (along the length direction of the flexible circuit board 600) may not be provided with the separation groove 623 due to its smaller deformation. Of course, the separation grooves 623 may also be provided on the active segments 620 at both ends of the flexible circuit board 600.

[0141] Taking the wider active section 620 near one end of the flexible circuit board 600 (along the length direction of the flexible circuit board 600) as an example, in the second part 625 formed by the dividing groove 623 on the active section 620, the areas near both sides of the second part 625 can be set as a multi-layer section 621, and the middle area of ​​the second part 625 can be an integral section 622.

[0142] For the movable segments 620 in the middle area of ​​the flexible circuit board 600, the movable segments 620 formed between the adjacent middle fixing portions 612 have a relatively large movable space (e.g., the section of the flexible circuit board 600 corresponding to the shaft 130) that can meet the deformation space requirements of the movable segments 620. Therefore, the separation grooves 623 (e.g., Fig.11 or Fig.12 As shown in FIG. 6 , for example, the entire movable segment 620 is a multi-layer segment 621. Of course, in some examples, a separation groove 623 may be provided on the movable segments 620, so that a part of the movable segment 620 is an integral segment 622 and another part is a multi-layer segment 621, and this embodiment does not limit this.

[0143] Continue to refer to Fig.11 or Fig.12 , the separation groove 623 includes a main groove section 6231, and the extension direction of the main groove section 6231 of the separation groove 623 has an angle with the width direction of the flexible circuit board 600. In other words, the main groove section 6231 extends in a direction inclined to the width direction of the flexible circuit board 600, and the main groove section 6231 extends to both ends of the movable section 620. For example, both ends of the main groove section 6231 extend to the fixing parts 610 at both ends of the movable section 620. In this way, the main groove section 6231 can separate the movable section 620 into a first part 624 and a second part 625 along the width direction of the flexible circuit board 600.

[0144] In order to avoid the situation where the hardness of the first part 624 is too high, in this embodiment, along the width direction of the flexible circuit board 600, the width occupied by the first part 624 can be smaller, while the width occupied by the second part 625 can be larger, so as to ensure the overall bending performance of the movable section 620 with the separation groove 623. On the basis of reducing the arch degree of the first part 624, when the first part 624 squeezes the adjacent device, the first part 624 can maintain a smaller width to reduce the pushing force of the first part 624 on the adjacent device.

[0145] For ease of explanation, in this embodiment, the two sides of the width direction of the flexible circuit board 600 are defined as the first side and the second side, respectively. The main groove section 6231 of the separation groove 623 can be arranged close to the first side of the flexible circuit board 600, and the first part 624 can be located between the first side of the flexible circuit board 600 and the main groove section 6231 of the separation groove 623. In other words, the width occupied by the first part 624 is small, and the width occupied by the second part 625 is large. Among them, the first side of the flexible circuit board 600 can be a side where the RF signal lines are concentrated, so that part or even all of the RF signal lines are located in the first part 624.

[0146] Based on the consideration of routing the wiring in the flexible circuit board 600 roughly along its length direction, in this embodiment, at least part of the main slot section 6231 of the separation slot 623 can extend along the length direction of the flexible circuit board 600. In this way, in the width direction of the flexible circuit board 600, the main slot section 6231 of the separation slot 623 occupies a very small space, and the interference with the routing path of the wiring in the flexible circuit board 600 is relatively small. The wiring in the flexible circuit board 600 can also maintain a routing path roughly along the length direction of the flexible circuit board 600. The wiring in the flexible circuit board 600 is relatively uniform, which can reduce signal interference and improve the signal transmission performance of the flexible circuit board 600.

[0147] Exemplarily, the extension shape of the main slot section 6231 of the separating slot 623 can be designed according to the extension shape of the active section 620 (where the separating slot 623 is located) and the wiring structure within the active section 620. A partial section of the main slot section 6231 can extend along the length direction of the flexible circuit board 600, or the entire main slot section 6231 can extend along the length direction of the flexible circuit board 600.

[0148] In addition, refer to Fig.14As shown, the figure shows a local enlarged structure of another flexible circuit board 600 at the location of the separation groove 623. In some embodiments, the width of the main groove section 6231 can be designed to be varied. For example, along the length direction of the main groove section 6231, the main groove section 6231 may include a first section 6231a, a middle section 6231b, and a second section 6231c connected in sequence. The first section 6231a and the second section 6231c are located at both ends of the main groove section 6231, and the middle section 6231b is located between the first section 6231a and the second section 6231c. Among them, the maximum width of the first section 6231a and the maximum width of the second section 6231c are both smaller than the minimum width of the middle section 6231b, and the main groove section 6231 is designed to be wide in the middle and narrow at both ends. On the basis of ensuring that the main groove section 6231 has a sufficient area, the width of the middle area of ​​the main groove section 6231 is increased, and the ability of the main groove section 6231 to absorb the bending deformation of the active section 620 is enhanced, which can better release the stress of the active section 620 and reduce the arching degree of the active section 620.

[0149] Illustratively, in the length direction of the main slot segment 6231, the width of the main slot segment 6231 can be gradually reduced from the center of the main slot segment 6231 to the edge of the main slot segment 6231. That is to say, the width of the main slot segment 6231 is gradually changed, thereby avoiding the step difference between the connecting part of the first segment 6231a and the middle segment 6231b and the connecting part of the second segment 6231c and the middle segment 6231b. During long-term or repeated bending, reliability problems such as local tearing and breaking caused by the step difference can be avoided.

[0150] Fig.12 , Fig.14 6 shows a case where the flexible circuit board 600 has a bending section 620a, and at least one of the movable sections 620 of the flexible circuit board 600 is a bending section 620a, that is, along the plane direction of the flexible circuit board 600, the movable section 620 of the flexible circuit board 600 is bent to one side, and the movable section 620 forms a corner at the bent portion. With respect to the first side and the second side in the width direction of the flexible circuit board 600 defined above, the movable section 620 can be bent in the direction where the first side is located.

[0151] In this regard, the movable segment 620 formed as a bending segment 620a and having a corner can be provided with a separation groove 623, and the movable segment 620 is bent toward the first side of the flexible circuit board 600, and the corner portion of the movable segment 620 is located on the first side of the flexible circuit board 600. By setting the first portion 624 between the first side of the flexible circuit board 600 and the separation groove 623 as an integral part, that is, setting the corner portion of the movable segment 620 as an integral part, the separation groove 623 can absorb the bending deformation of the corner portion, and the hardness of the corner portion is slightly larger, which can reduce the degree of arching of the corner portion, thereby reducing the contact area between adjacent devices at the corner portion, and even the corner portion is not in contact with adjacent devices, thereby reducing or even eliminating the top force of the corner portion on the adjacent devices, and improving the abnormal pressing sound and film printing problems of the electronic device 1.

[0152] Reference Fig.12 or Fig.14 As shown, for the main groove section 6231 of the separation groove 623 extending roughly along the length direction of the flexible circuit board 600, the extension shape of the main groove section 6231 can match the bending shape of the corner part of the bending section 620a. Taking the bending angle of the bending section 620a as approximately 90° as an example, the central angle corresponding to the corner part of the bending section 620a is approximately 90°. Correspondingly, the main groove section 6231 of the separation groove 623 can be roughly formed into an arc structure of 1 / 4 arc.

[0153] In some embodiments, the corner of the bending section 620a may be designed with a crack stop groove 626. The crack stop groove 626 is formed by removing more material from the corner on the basis of the corner having an arc that matches the bend, so that the boundary of the corner is retracted, the notch area of ​​the corner is increased, and a groove structure extending inward is formed at the corner. Such a design removes part of the material at the corner, which helps to improve the material accumulation at the corner and avoid the phenomenon of the flexible circuit board 600 being broken due to severe stacking at the corner.

[0154] In this regard, in order to match the crack stop groove 626 at the corner of the bending section 620a, the main groove section 6231 of the separation groove 623 corresponding to the corresponding part of the crack stop groove 626 can also be offset inward to ensure that there is enough space between the main groove section 6231 and the crack stop groove 626, so as to avoid the situation where the first part 624 is locally too narrow at the location of the crack stop groove 626, thereby ensuring the reliability of the first part 624. Exemplarily, the middle section of the main groove section 6231 of the separation groove 623 protrudes in the direction away from the corner, and the main groove section 6231 is formed into a "C"-shaped structure.

[0155] Fig.15 This is a schematic diagram of the structure of the third flexible circuit board in the unfolded state provided in the embodiment of the present application. Fig.15As shown in the figure, the flexible circuit board 600 has no obvious bending section 620a and extends roughly in a straight line. At this time, for the active section 620 with a separation groove 623, for example, the active section 620 close to the end of the flexible circuit board 600, the extension shape of the separation groove 623 can match the side shape of the side close to the flexible circuit board 600. For the aforementioned separation groove 623 close to the first side of the flexible circuit board 600, the extension shape of the separation groove 623 can match the side shape of the first side of the flexible circuit board 600, so that the separation groove 623 is separated to form a first part 624 with good width consistency and high reliability.

[0156] by Fig.15 As shown in the example, from the end fixing portion 611 of the flexible circuit board 600 to the adjacent middle fixing portion 612, the first side of the flexible circuit board 600 includes a straight section, an inclined section (inclined from the outside to the inside) and a straight section connected in sequence, and matching therewith, the separation groove 623 may also include a straight section, an inclined section (inclined from the outside to the inside) and a straight section connected in sequence.

[0157] Fig.16 A schematic diagram of the structure of a fourth flexible circuit board in an unfolded state provided in an embodiment of the present application; Fig.17 This is a schematic structural diagram of a fifth flexible circuit board in an unfolded state provided in an embodiment of the present application.

[0158] Reference Fig.16 and Fig.17 As shown, in some embodiments, the separation groove 623 is further provided with a branch groove section 6232 on the basis of the main groove section 6231, and the branch groove section 6232 intersects with the main groove section 6231, and the branch groove section 6232 is connected with the main groove section 6231, and together constitutes the separation groove 623. In this way, the area of ​​the separation groove 623 is increased, and the branch groove section 6232 and the main groove section 6231 have an intersection, which enhances the ability of the separation groove 623 to absorb the bending deformation of the active section 620. The main groove section 6231 and the branch groove section 6232 can absorb stress from different directions and disperse the stress, which can better release the stress of the active section 620, reduce the degree of arching of the active section 620, and reduce the top force of the active section 620 on the adjacent device, thereby improving the problems of abnormal pressing sound and film printing of the electronic device 1.

[0159] As mentioned above, in the case where the width of the first portion 624 is small, the branch slot section 6232 can be set in the second portion 625, and one end of the branch slot section 6232 facing the main slot section 6231 is connected to the main slot section 6231, and the other end of the branch slot section 6232 extends in a direction away from the main slot section 6231. In this way, the branch slot section 6232 does not occupy the space of the first portion 624, so as to avoid causing the first portion 624 to be partially too narrow and to avoid affecting the reliability of the first portion 624. Of course, in the case where the first portion 624 is wider, if it does not affect the reliability of the first portion 624, the branch slot section 6232 can also extend from the second portion 625 to the area where the first portion 624 is located, and even the branch slot section 6232 can also be completely located in the first portion 624, and this embodiment does not limit this.

[0160] Reference Fig.16 As shown, in some examples, the branch slot segment 6232 can be connected to the middle of the main slot segment 6231, and the branch slot segment 6232 extends in a direction away from the main slot segment 6231. The branch slot segment 6232 can extend into the multi-layer segment 621, or the branch slot segment 6232 can also extend into the integral segment 622; Fig.17 As shown, in other examples, the branch slot segment 6232 can be connected to the end of the main slot segment 6231. Since the end of the main slot segment 6231 extends to the fixed portion 610 on one side of the movable segment 620, the branch slot segment 6232 can extend into the area where the movable segment 620 is located, and the branch slot segment 6232 can extend into the multi-layer segment 621, or the branch slot segment 6232 can also extend into the integral segment 622.

[0161] Fig.16 and Fig.17 The partition groove 623 is provided on the movable section 620 forming the bending section 620a, and the main groove section 6231 of the partition groove 623 is similar to an arc section, which matches the bending part of the bending section 620a. At this time, when the branch groove section 6232 is located in the second part 625, and one end of the branch groove section 6232 is connected to the middle of the main groove section 6231, the shape of the partition groove 623 formed is similar to a "Y" shape (see Fig.16 ); When the branch groove section 6232 is located in the second portion 625 and is connected to one end of the main groove section 6231, specifically taking the branch groove section 6232 extending from the end of the main groove section 6231 along the tangent direction of the main groove section 6231 as an example, the shape of the formed separation groove 623 is similar to a "T" shape (see Fig.17 ).

[0162] As for the depth of the separation groove 623 extending in the thickness direction of the flexible circuit board 600, as an embodiment, the separation groove 623 can penetrate the two side surfaces in the thickness direction of the flexible circuit board 600, which is equivalent to the separation groove 623 penetrating each structural layer 6211 of the multi-layer segment 621. In this way, the separation groove 623 completely separates the first part 624 and the second part 625, and the bending and deformation of the first part 624 and the second part 625 are completely unaffected, and the influence of the harder first part 624 on the multi-layer segment 621 of the second part 625 can be completely isolated, so that the multi-layer segment 621 of the second part 625 can fully exert its soft characteristics.

[0163] As another embodiment, the separation groove 623 may not completely penetrate the two side surfaces of the flexible circuit board 600 in the thickness direction. Taking the multi-layer segment 621 including N (positive integer ≥ 2) layers as an example, the separation groove 623 may penetrate the N-1 layer of the multi-layer segment 621, and the bottom layer of the multi-layer segment 621 and the first part 624 are connected together. The bottom layer of the multi-layer segment 621 is defined according to the bending direction of the active segment 620. Taking the bending of the active segment 620 in the first direction as an example, along the first direction, the bottommost structural layer 6211 of the multi-layer segment 621 is defined as the bottom layer, and each structural layer 6211 stacked on the bottom layer is defined as a stack. The separation groove 623 penetrates each stack of the multi-layer segment 621, and the bottom layer and the first part 624 are connected together. For example, the bottom layer and the first part 624 can be integrally formed.

[0164] Specifically, for the active segment 620 near the end of the flexible circuit board 600, taking the active segment 620 attached to the board surface of the circuit board 300 as an example, the active segment 620 is usually bent in the direction away from the circuit board 300, then the first direction is the direction away from the circuit board 300, the bottom layer of the multi-layer segment 621 is a structural layer 6211 closest to the circuit board 300, and above the bottom layer are various stacked layers. The structural layer 6211 closest to the circuit board 300 in the multi-layer segment 621 is connected to the first part 624, and the dividing groove 623 runs through the remaining stacked layers.

[0165] By connecting the bottom layer of the multilayer segment 621 with the first portion 624, the separation groove 623 only penetrates the laminated layers of the multilayer segment 621. Among the structural layers 6211 of the multilayer segment 621, only the movement of the bottom layer is affected by the first portion 624. Since the hardness of the first portion 624 is slightly greater, the first portion 624 can also reduce the degree of arching of the bottom layer of the multilayer segment 621. The laminated layers above the bottom layer of the multilayer segment 621 can move freely, and the structural layers 6211 of the multilayer segment 621 are still separated from each other. The multilayer segment 621 can still give full play to its softness and can still reduce the force of the multilayer segment 621 on the adjacent devices, thereby improving the problems of abnormal pressing noise and film printing of the electronic device 1.

[0166] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0167] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

Claims

1. A flexible circuit board for installation in an electronic device, characterized in that: The flexible circuit board includes at least one movable segment arranged along the length direction of the flexible circuit board, and the movable segment can move in the electronic device; wherein, at least one of the movable segments is provided with a separation groove, and along the width direction of the flexible circuit board, the separation groove separates the movable segment into a first part and a second part.

2. The flexible circuit board according to claim 1, characterized in that: The first portion is an integral portion, and at least a portion of the second portion is a multi-layer segment. The multi-layer segment includes at least two structural layers arranged along the thickness direction of the flexible circuit board, and the structural layers are separated from each other.

3. The flexible circuit board according to claim 2, characterized in that: A plurality of radio frequency signal lines are arranged in the flexible circuit board, and at least some of the radio frequency signal lines are distributed in the first part.

4. The flexible circuit board according to any one of claims 1 to 3, characterized in that: The separation groove comprises a main groove section, an extension direction of the main groove section forms an angle with a width direction of the flexible circuit board, and the main groove section extends to both ends of the movable section.

5. The flexible circuit board according to claim 4, characterized in that: The two sides of the flexible circuit board in the width direction are respectively a first side and a second side, the main groove section is close to the first side, and the first portion is located between the first side and the main groove section.

6. The flexible circuit board according to claim 4, characterized in that: At least a portion of the main slot section extends along the length direction of the flexible circuit board.

7. The flexible circuit board according to claim 4, characterized in that: The dividing groove further includes at least one branch groove section, and the branch groove section intersects and communicates with the main groove section.

8. The flexible circuit board according to claim 7, characterized in that: The branch slot section is located in the second portion, one end of the branch slot section is communicated with the main slot section, and the other end of the branch slot section extends in a direction away from the main slot section.

9. The flexible circuit board according to claim 8, characterized in that: The branch slot section is connected to the middle portion of the main slot section.

10. The flexible circuit board according to claim 8, characterized in that: The branch slot section is connected to one end of the main slot section.

11. The flexible circuit board according to claim 10, characterized in that: The main slot section is an arc-shaped section, and the branch slot section extends along the tangent direction of the main slot section.

12. The flexible circuit board according to claim 4, characterized in that: At least one of the movable sections provided with the dividing groove is a bending section, and the bending section is bent toward the side where the first portion is located.

13. The flexible circuit board according to claim 12, characterized in that: A crack-stop groove is provided at the corner of the bending section, and the extended shape of the main groove section matches the shape of the crack-stop groove.

14. The flexible circuit board according to any one of claims 1 to 3, characterized in that: It also includes at least two fixing parts, each of which is arranged at intervals along the length direction of the flexible circuit board, and the fixing parts are used to be fixedly connected to the components of the electronic device, and the movable section is located between adjacent fixing parts.

15. The flexible circuit board according to claim 14, characterized in that: The at least two fixing parts include two end fixing parts and at least one middle fixing part, the two end fixing parts are respectively located at two ends of the flexible circuit board, the end fixing parts are used to connect with the components in the electronic device, and the middle fixing part is located between the two end fixing parts; Wherein, the movable section between at least one of the end fixing parts and the adjacent middle fixing part is provided with the separation groove.

16. The flexible circuit board according to claim 15, characterized in that: In the movable section provided with the separation groove and located between the end fixing section and the middle fixing section, the two side areas in the second section are multi-layer sections and the middle area is an integral section.

17. The flexible circuit board according to claim 15, characterized in that: The movable section between adjacent intermediate fixing parts is a multi-layer section.

18. The flexible circuit board according to claim 4, characterized in that: Along the extension direction of the main slot section, the main slot section includes a first section, a middle section and a second section connected in sequence, and the maximum width of the first section and the maximum width of the second section are both smaller than the minimum width of the middle section.

19. The flexible circuit board according to claim 18, characterized in that: The width of the main slot section gradually decreases from the center of the main slot section to the edge of the main slot section.

20. The flexible circuit board according to any one of claims 1 to 3, characterized in that: The separation groove passes through both side surfaces of the flexible circuit board in the thickness direction.

21. The flexible circuit board according to any one of claims 1 to 3, characterized in that: In the thickness direction of the flexible circuit board, the movable section is bent toward a first direction; Along the first direction, the multi-layer segment includes a bottom layer and at least one stacked layer stacked on the bottom layer, the separation groove penetrates each of the stacked layers, and the bottom layer is connected to the first portion.

22. An electronic device, characterized in that: It comprises a housing assembly and the flexible circuit board according to any one of claims 1 to 21, wherein the flexible circuit board is located in the housing assembly and is connected to at least two devices in the housing assembly.

23. The electronic device according to claim 22, characterized in that: The housing assembly comprises a first middle frame, a second middle frame and a rotating shaft, wherein the first middle frame and the second middle frame are movably connected to two sides of the rotating shaft respectively; The first end of the flexible circuit board is connected to the device installed on the first middle frame, and the second end of the flexible circuit board passes through the rotating shaft and is connected to the device installed on the second middle frame.

24. The electronic device according to claim 23, characterized in that: The electronic device further includes a first display screen, which is mounted on first sides of the first middle frame and the second middle frame.

25. The electronic device according to claim 24, characterized in that: The electronic device further includes a second display screen, which is mounted on a second side of the second middle frame, and the second side is opposite to the first side; Wherein, a separation groove is provided at the movable section close to the second end of the flexible circuit board.

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