Flexible circuit board and electronic equipment

Abstract

The utility model provides a flexible circuit board and electronic equipment, and relates to the technical field of electronic equipment. The flexible circuit board comprises a carrier plate formed by a plurality of circuits; the first connecting end is located at the first end of the carrier plate; the second connecting end is located at the second end of the carrier plate; the first fixing piece is fixed at a first position on the first surface of the carrier plate, and the first position is close to the first end; the second fixing piece is fixed at a second position of the first surface of the carrier plate, the second position is close to the second end, and a free section of the carrier plate is arranged between the first fixing piece and the second fixing piece; the first fixing piece comprises a first eave body, and the first eave body faces the second position; the second fixing piece comprises a second eave body, the second eave body faces the first position, and the first eave body and the second eave body are used for restraining deformation of the free section.

Description

Technical Field

[0001] This application relates to the field of electronic equipment technology, and more particularly to a flexible circuit board and electronic equipment. Background Technology

[0002] Foldable electronic devices achieve relative movement between at least two bodies via a connecting device, and achieve electrical connection between the two bodies by arranging a flexible printed circuit board (FPC) passing through the connecting device. After the flexible printed circuit board is fixed to the two bodies, the portion between the two fixed positions of the flexible printed circuit board is free, thus supporting the maintenance of electrical connection in both the folded and unfolded states of the foldable electronic device. However, the flexible printed circuit board also means that when the foldable electronic device is flattened, the portion between the two fixed positions of the flexible printed circuit board is unrestrained and can deform arbitrarily, easily colliding with surrounding structures, causing excessive local wear or breakage. Utility Model Content

[0003] The embodiments of this application provide the following technical solutions:

[0004] This application provides a flexible circuit board, comprising: a carrier board formed by a plurality of circuits; a first connecting end located at a first end of the carrier board; a second connecting end located at a second end of the carrier board; a first fixing member fixed to a first position on a first surface of the carrier board, the first position being close to the first end; a second fixing member fixed to a second position on the first surface of the carrier board, the second position being close to the second end; the first fixing member and the second fixing member forming a free segment of the carrier board; the first fixing member including a first eaves facing the second position; the second fixing member including a second eaves facing the first position; the first eaves and the second eaves constraining the deformation of the free segment.

[0005] In some embodiments of this application, the first connecting end is used to connect to the third connecting end of the assembled electronic device, and the second connecting end is used to connect to the fourth connecting end of the assembled electronic device; the first position is used to be fixedly connected to the third fastener of the assembled electronic device, and the second position is used to be fixedly connected to the fourth fastener of the assembled electronic device; wherein, the free segment of the carrier plate changes with the shape of the electronic device.

[0006] In some embodiments of this application, the plurality of lines includes a first category of lines and a second category of lines, wherein the first category is different from the second category.

[0007] In some embodiments of this application, the first type of line is a power line for transmitting power signals, and the second type of line is a radio frequency line for transmitting radio frequency signals; the radio frequency line is connected to one side of the power line, and the surface of the carrier board having the radio frequency line is the first surface.

[0008] In some embodiments of this application, the first fixing member and the second fixing member are epoxy glass cloth laminates, and the first fixing member and the second fixing member have less than a threshold effect on the high-frequency radio frequency signal transmitted by the radio frequency line.

[0009] In some embodiments of this application, the first fixing member further includes a first plate extending from the first plate toward the second position to form a first eave, the first plate being used for fixed connection with the third fixing member; the second fixing member further includes a second plate extending from the second plate toward the first position to form a second eave, the second plate being used for fixed connection with the fourth fixing member; wherein, the surface of the free segment facing the first eave and the second eave is movably connected to the first eave and the second eave.

[0010] In some embodiments of this application, the length of the first plate is greater than the width of the free segment, and the length of the first eaves is adapted to the width of the free segment; the length of the second plate is greater than the width of the free segment, and the length of the second eaves is adapted to the width of the free segment.

[0011] A second aspect of this application provides an electronic device, comprising: a connecting device; a first body; a second body, the first body and the second body being rotatably connected via the connecting device; a flexible circuit board, a first fixing member of the flexible circuit board being fixed relative to the first body, and a second fixing member of the flexible circuit board being fixed relative to the second body to form a free segment of the flexible circuit board between the first fixing member and the second fixing member; the free segment passing through the connecting device and deforming with the shape of the electronic device; a first eave of the first fixing member corresponding to the free segment, and a second eave of the second fixing member corresponding to the free segment, the first eave and the second eave serving to constrain the deformation of the free segment.

[0012] In some embodiments of this application, the electronic device is in a first posture in which the first body is stacked on the second body, and the free segment is in a taut state; the electronic device is in a second posture in which the first body is not stacked on the second body, and the free segment is in a relaxed state. The first eaves are used to constrain the deformation of the free segment in the relaxed state toward the first eaves, and the second eaves are used to constrain the deformation of the free segment in the relaxed state toward the second eaves.

[0013] In some embodiments of this application, the flexible circuit board includes radio frequency lines and signal lines; the first fixing member and the second fixing member have less than a threshold effect on the high-frequency radio frequency signals transmitted by the radio frequency lines. Attached Figure Description

[0014] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein:

[0015] Figure 1 A schematic diagram of the structure of the flexible circuit board of Embodiment 1 of this application is shown.

[0016] Figure 2 A partial structural diagram of the electronic device of Embodiment 2 of this application is schematically shown;

[0017] Figure 3 A partial structural diagram of another embodiment of the electronic device of Embodiment 2 of this application is schematically shown;

[0018] Explanation of icon numbers:

[0019] 1. Carrier plate; 101. First connecting end; 102. Second connecting end; 103. Free segment; 104. Power cable; 105. Radio frequency cable; 2. First fixing component; 201. First plate body; 202. First eaves body; 3. Second fixing component; 301. Second plate body; 302. Second eaves body;

[0020] 10. Flexible circuit board; 20. Connecting device; 30. First body; 40. Second body; 50. Third fastener; 60. Fourth fastener. Detailed Implementation

[0021] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0022] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0023] In foldable electronic devices, traditional flexible printed circuit boards (PCBs) are prone to arbitrary deformation and bending when the device is flattened, due to the unrestrained space between the two fixed positions, resulting in bulges. This bulging occurs because the flexible PCB, being flexible itself, is subjected to pressure from the space between the two fixed positions, device movement, or other external forces, causing localized bending and arching. These bulges easily come into contact with the surrounding structure within the electronic device. During frequent folding and unfolding, the contacting areas are constantly subjected to friction and pressure, leading to excessive localized wear. In severe cases, this can even cause the flexible PCB to break, affecting the normal use and lifespan of the foldable electronic device.

[0024] This embodiment of the application constrains the deformation of the free segment of the carrier board by setting a first fixing member and a second fixing member on the carrier board of the flexible circuit board, and respectively setting a first eave and a second eave facing each other on the fixing members. This makes the bending of the flexible circuit board more standardized during the folding and flattening of electronic devices, and avoids excessive bending or excessive bulging in local areas. This prevents the free segment from contacting the surrounding structure, thereby solving the risk of local excessive wear and breakage caused by contact and stress concentration.

[0025] Example 1

[0026] This application provides a flexible circuit board, such as... Figures 1 to 3 As shown, it includes: a carrier plate 1 formed by multiple lines; a first connecting end 101 located at the first end of the carrier plate 1; a second connecting end 102 located at the second end of the carrier plate 1; a first fixing member 2 fixed to a first position on the first surface of the carrier plate 1, the first position being close to the first end; a second fixing member 3 fixed to a second position on the first surface of the carrier plate 1, the second position being close to the second end, and a free segment 103 of the carrier plate 1 between the first fixing member 2 and the second fixing member 3; the first fixing member 2 includes a first eave 202 facing the second position; the second fixing member 3 includes a second eave 302 facing the first position, and the first eave 202 and the second eave 302 are used to constrain the deformation of the free segment 103.

[0027] Flexible circuit boards can be used in foldable electronic devices, such as foldable mobile phones and foldable tablets. A flexible circuit board consists of a carrier board 1 formed by multiple circuits. The carrier board 1 is flexible and can be bent to a certain extent. A first connecting end 101 and a second connecting end 102 are respectively provided at both ends of the carrier board 1. The first connecting end 101 is located at the first end of the carrier board 1, and the second connecting end 102 is located at the second end of the carrier board 1. These are used to connect the left and right halves of the foldable electronic device's body system to achieve signal transmission.

[0028] On the first surface of the carrier plate 1, a first fastener 2 is fixed at a first position near the first end. The first fastener 2 has a first eave 202 facing a second position. The first fastener 2 can be firmly fixed to the designated position of the carrier plate 1 by welding, gluing, or other methods. The first eave 202 can be a sheet-like structure extending from the first fastener 2, facing the second fastener 3. Similarly, on the first surface of the carrier plate 1, a second fastener 3 is fixed at a second position near the second end. The second fastener 3 has a second eave 302 facing the first position. The second fastener 3 and the first fastener 2 can have the same structure, and the second eave 302 can also be a similar sheet-like structure facing the first fastener 2. The portion between the first fastener 2 and the second fastener 3 is the free segment 103 of the carrier plate 1. The free segment 103 will bend and deform when the foldable electronic device is folded.

[0029] The flexible circuit board provided in this embodiment can restrict the deformation of the free segment 103 from both sides through the first eaves 202 and the second eaves 302. When the electronic device is flattened, the first and second positions are close to each other, and the free segment 103 is in a free and unrestrained state, which is prone to arbitrary deformation and bending, forming a protrusion. Excessive protrusion can easily collide with other structures inside the electronic device. By forming a barrier from both sides of the free segment 103 through the opposing first eaves 202 and second eaves 302, when the free segment 103 bends and attempts to form a protrusion on the side close to the first eaves 202 or the second eaves 302, the surface of the free segment 103 will come into contact with the first eaves 202 or the second eaves 302. The eaves will apply a reverse supporting force to the free segment to suppress this arching tendency of the free segment 103, thereby avoiding the protrusion of the free segment 103 from colliding with other structures in the electronic device. This reduces the probability of excessive wear or breakage of the flexible circuit board and significantly improves the durability and service life of the flexible circuit board.

[0030] In some embodiments, such as Figure 2 and Figure 3As shown, the first connecting end 101 is used to connect to the third connecting end of the assembled electronic device, and the second connecting end 102 is used to connect to the fourth connecting end of the assembled electronic device; the first position is used to fix the third fixing member 50 of the assembled electronic device, and the second position is used to fix the fourth fixing member 60 of the assembled electronic device; wherein, the free segment 103 of the carrier plate 1 changes with the shape of the electronic device.

[0031] During the assembly of electronic devices, the first connection terminal 101 of the flexible circuit board is connected to the third connection terminal of the electronic device, and the second connection terminal 102 is connected to the fourth connection terminal. This connection method can employ connectors, soldering, or crimping processes to ensure the stability of electrical and data signal transmission.

[0032] The third fixing member 50 and the fourth fixing member 60 can be structures such as brackets or bases within the electronic device. The first position can be firmly connected to the third fixing member 50 of the electronic device by means of welding, screw fixing, or bonding, and the second position is fixed in the same way as the fourth fixing member 60. By determining the installation positions of the third fixing member 50 and the fourth fixing member 60, the flexible circuit board is fixed inside the electronic device, but its free section 103 can be within a reasonable range of motion to avoid loosening or displacement during the use of the electronic device.

[0033] When the electronic device undergoes a shape change, such as folding from an unfolded state to a closed state, or unfolding from a closed state, the free segment 103 will deform accordingly with the movement of the electronic device. Since both ends of the free segment 103 are fixed, its deformation process is constrained, and it can only bend within the range defined by the first eaves 202 and the second eaves 302. Due to the constraints of the first eaves 202 and the second eaves 302, the flexible circuit board's bending and stretching during the folding or unfolding of the electronic device can proceed in a preset manner. This avoids localized stress concentration in the flexible circuit board caused by arbitrary deformation of the free segment 103 and prevents the bulge formed by the bending of the free segment 103 from colliding with other structures within the electronic device, reducing the probability of excessive wear or breakage of the flexible circuit board and significantly improving its durability and service life.

[0034] In some embodiments, the plurality of lines include lines of a first category and lines of a second category, wherein the first category is different from the second category.

[0035] The circuits on a flexible circuit board are divided into two categories: Category 1 and Category 2. For example, circuits used to transmit high-frequency, high-speed data signals can be classified as Category 1, while circuits used to transmit low-frequency control signals or power signals can be classified as Category 2.

[0036] The interface design can be customized at the first connection end 101 and the second connection end 102 of the flexible circuit board according to the different types of lines. The first type of lines are connected to connectors or interfaces adapted for high-frequency and high-speed signal transmission to ensure efficient signal transmission; the second type of lines are connected to interfaces adapted for low-frequency signal or power transmission to ensure the stability of the connection and electrical performance.

[0037] By integrating the two types of circuits together, installation and replacement are facilitated. Furthermore, the categorized design of the circuits makes the internal signal transmission structure of electronic equipment clearer, enabling quick identification of the problematic circuit category during maintenance and troubleshooting, thus improving repair efficiency. The constraint of the first eaves 202 and the second eaves 302 on the deformation of the free segment 103 ensures that the entire flexible circuit board, including both types of circuits, maintains a relatively stable shape and position when the electronic equipment changes form. This helps prevent damage to different types of circuits due to excessive deformation or improper bending angles, ensuring that the performance of all types of circuits is unaffected.

[0038] In some embodiments, such as Figure 1 As shown, the first type of line is a power line 104 for transmitting power signals, and the second type of line is a radio frequency line 105 for transmitting radio frequency signals; the radio frequency line 105 is connected to one side of the power line 104, and the surface of the carrier board 1 with the radio frequency line 105 is the first surface.

[0039] The first category of circuit is the power cable 104, which plays a crucial role in supplying power to the various components of the mobile phone. For example, the power cable 104 transmits electrical energy from the phone's battery to components such as the processor, display, and camera. The second category of circuit is the radio frequency (RF) cable 105, which is responsible for transmitting the phone's RF signals, enabling the phone's communication functions, such as connecting to 5G networks, transmitting WiFi signals, and exchanging Bluetooth data.

[0040] The radio frequency (RF) line 105 is tightly connected to one side of the power line 104, and the side of the carrier board 1 on which the RF line 105 is laid is defined as the first surface. The carrier board 1 may have a multi-layer structure. The first layer of the carrier board 1 is used to lay the RF line 105, and the RF line 105 is printed or etched on the insulating material of this layer. The RF line 105 is located on one side of the power line 104, and then the layers are bonded together by a lamination process to form a complete carrier board 1.

[0041] The first fixing member 2 and the second fixing member 3 are installed on the first surface of the carrier plate 1, that is, the surface with the radio frequency line 105. When the first eaves 202 and the second eaves 302 constrain the free section 103, they ensure that the power line 104 and the radio frequency line 105 are not compressed or bent, ensuring that the circuit can deform freely during the folding process of the electronic device, while controlling the deformation range within a safe range, and avoiding circuit breakage or performance degradation due to excessive bending.

[0042] In some embodiments of this application, the first fixing member 2 and the second fixing member 3 are epoxy glass cloth laminates, and the first fixing member 2 and the second fixing member 3 have less than a threshold effect on the high-frequency radio frequency signal transmitted by the radio frequency line 105.

[0043] Both the first fixing member 2 and the second fixing member 3 of the flexible circuit board are made of epoxy glass cloth laminate. The processed epoxy glass cloth laminate can be fixed to the first surface of the carrier board 1, i.e., the surface with the RF cable 105, by bonding or welding. The epoxy glass cloth laminate has insulating properties and low impact on high-frequency RF signals, ensuring that the 5G, WiFi, and other high-frequency signals transmitted by the RF cable 105 are not interfered with by the fixing member during the folding or unfolding of the mobile phone, effectively avoiding signal attenuation and distortion. Furthermore, the epoxy glass cloth laminate has good mechanical strength and rigidity, and as the first fixing member 2 and the second fixing member 3, it can firmly fix the flexible circuit board, maintaining its stable position during frequent folding of the mobile phone, reducing problems such as loose connections and wire wear caused by circuit board displacement, and extending the service life of the flexible circuit board.

[0044] In related technologies, power lines 104 and RF lines 105 are separate, and insulating layers can be provided on both sides of RF line 105. In this case, 3D steel sheets can be used as reinforcing plates and placed at the first and second positions of the flexible circuit board. In the embodiment of this application, the flexible circuit board integrates the two types of lines, power lines 104 and RF lines 105, and the insulating layers on both sides of RF line 105 are eliminated. Traditional 3D steel sheets are made of metal and can cause electromagnetic interference to high-frequency RF signals. The low signal interference characteristics of epoxy glass cloth laminate eliminate this interference risk at the source, creating a good signal transmission environment for RF line 105.

[0045] When the user folds or unfolds the phone, the free segment 103 of the flexible circuit board bends accordingly. Since the RF cable 105 is connected to the power cable 104 on one side and located on the first surface of the carrier board 1, the epoxy glass cloth laminate used in the first and second fixing members 2 and 3 has less than a threshold impact on the high-frequency RF signal transmitted by the RF cable 105. This compensates for the signal quality impact of the coupling between the 3D steel reinforcement plate and the RF cable 105 signal line, while also preventing circuit breakage or performance degradation due to excessive bending.

[0046] In some embodiments, the first fixing member 2 further includes a first plate 201, the first plate 201 extending a first eave 202 towards the side of the second position, the first plate 201 being used for fixed connection with the third fixing member 50; the second fixing member 3 further includes a second plate 301, the second plate 301 extending a second eave 302 towards the side of the first position, the second plate 301 being used for fixed connection with the fourth fixing member 60; wherein, the surface of the free segment 103 facing the first eave 202 and the second eave 302 is movably connected to the first eave 202 and the second eave 302.

[0047] The first fastener 2 includes a first plate 201, which may be a regularly shaped rectangular structure. It can be firmly connected to the carrier plate 1 and the third fastener 50 inside the left half of the electronic device body by adhesive bonding. A first eave 202 extends from the side facing the second position. The second fastener 3 also includes a second plate 301, which can be firmly connected to the carrier plate 1 and the fourth fastener 60 inside the right half of the electronic device body by adhesive bonding. A second eave 302 extends from the side facing the first position.

[0048] The free segment 103 of the flexible circuit board is located between the first fixing member 2 and the second fixing member 3. The surface of the free segment 103 facing the first eaves 202 and the second eaves 302 is movably connected to them. That is, the free segment 103 is not connected to the first eaves 202 and the second eaves 302. During bending, the free segment 103 can move flexibly relative to the first eaves 202 and the second eaves 302 and bend within the constraint range of the first eaves 202 and the second eaves 302.

[0049] The first plate 201 and the third fixing member 50, and the second plate 301 and the fourth fixing member 60 are firmly connected, serving as reinforcing plates to provide a stable support structure for the flexible circuit board. The first eaves 202 and the second eaves 302 can act as limiting structures to constrain the bending shape, angle, and position of the free segment 103, supporting and preventing the free segment 103 of the flexible circuit board from folding back, so that the free segment 103 deforms in a predetermined manner during the folding process of the electronic device, avoiding excessive bending or irregular deformation, and effectively protecting the flexible circuit board.

[0050] In some embodiments, the length of the first plate 201 is greater than the width of the free segment 103, and the length of the first eaves 202 is adapted to the width of the free segment 103; the length of the second plate 301 is greater than the width of the free segment 103, and the length of the second eaves 302 is adapted to the width of the free segment 103.

[0051] The lengths of the first eaves 202 and the second eaves 302 are adapted to the width of the free section 103, which can precisely constrain the free section 103 from both sides. When the electronic device is folded, it can effectively prevent the free section 103 from undergoing irregular lateral deformation, ensuring that the free section 103 only bends in a predetermined direction and range, making the deformation of the flexible circuit board more standardized and controllable, and reducing the risk of circuit damage caused by irregular deformation.

[0052] The length of the first plate 201 and the second plate 301 is greater than the width of the free section 103. Two protrusions can be provided in the width direction of the free section 103, thereby providing a larger fixing area. This allows the plate to withstand greater external force when fixed to the machine body, ensuring that the first fixing member 2 and the second fixing member 3 remain stable during the frequent folding of the equipment and will not loosen. This ensures continuous and effective constraint on the free section 103 and further improves the stability of the flexible circuit board.

[0053] Example 2

[0054] This application provides an electronic device, such as... Figure 2 and Figure 3 As shown, it includes: a connecting device 20; a first body 30; a second body 40, the first body 30 and the second body 40 being rotatably connected by the connecting device 20; a flexible circuit board 10, the first fixing member 2 of the flexible circuit board 10 being fixed relative to the first body 30, and the second fixing member 3 of the flexible circuit board 10 being fixed relative to the second body 40 to form a free segment 103 of the flexible circuit board 10 between the first fixing member 2 and the second fixing member 3; the free segment 103 passes through the connecting device 20 and deforms with the shape change of the electronic device; the first eaves 202 of the first fixing member 2 corresponds to the free segment 103, and the second eaves 302 of the second fixing member 3 corresponds to the free segment 103, the first eaves 202 and the second eaves 302 being used to constrain the deformation of the free segment 103.

[0055] The electronic device can be a foldable phone, foldable computer, or foldable tablet computer, etc. The electronic device includes a first body 30, a second body 40, and a connecting device 20. The first body 30 can be the left half of the phone's body, the second body 40 can be the right half of the phone's body, and the connecting device 20 can be a hinge structure. The two bodies are rotatably connected through the connecting device 20, allowing the electronic device to fold or unfold. A channel for a flexible circuit board 10 to pass through is provided inside the hinge structure. The two ends of the flexible circuit board 10 are respectively fixed to the first body 30 and the second body 40 by a first fixing member 2 and a second fixing member 3, forming a region that can freely deform as the electronic device is opened and closed, namely, the free segment 103.

[0056] The first fixing member 2 of the flexible circuit board 10 can be fixed to the frame inside the first body 30, and the second fixing member 3 is installed on the frame of the second body 40. When the user folds the phone, the free segment 103 passes through the hinge device, and its flexible nature may cause local excessive bending and arching. Under the constraint of the first eaves 202 and the second eaves 302, when the free segment 103 bends and attempts to form a bulge on the side close to the first eaves 202 or the second eaves 302, the free segment 103 will come into contact with the first eaves 202 or the second eaves 302. The eaves will exert a reverse supporting force on the free segment, pressing downward to suppress the arching tendency of the free segment 103, thereby avoiding contact and friction between the free segment 103 and other internal structures of the electronic device. This solves the risk of local excessive wear and breakage caused by friction and stress concentration, and improves the service life and reliability of the flexible circuit board and the electronic device.

[0057] In some embodiments, the electronic device is in a first posture in which the first body 30 is stacked on the second body 40, and the free segment 103 is in a taut state; the electronic device is in a second posture in which the first body 30 is not stacked on the second body 40, and the free segment 103 is in a relaxed state. The first eaves 202 is used to constrain the deformation of the relaxed free segment 103 toward the first eaves 202, and the second eaves 302 is used to constrain the deformation of the relaxed free segment 103 toward the second eaves 302.

[0058] When the phone is in its first posture, with the first body 30 stacked on top of the second body 40, the free segment 103 of the flexible circuit board 10 is taut when the foldable phone screen bends outward or inward. At this time, the free segment 103 is stretched. When the user opens the phone and enters the second posture, where the first body 30 is no longer stacked on top of the second body 40 and the screen is fully unfolded, the free segment 103 changes from a taut state to a relaxed state, bending and arching. The first eaves 202 of the first fixing member 2 restricts excessive arching of the free segment 103 towards the first eaves 202, and the second eaves 302 of the second fixing member 3 constrains excessive arching of the free segment 103 towards the second eaves 302. This prevents the arc-shaped protrusion caused by the relaxed state of the free segment 103 from colliding with other structures within the electronic device when the device is in a flattened state, avoiding the risk of excessive local wear and breakage. This effectively extends the service life of the flexible circuit board 10 and reduces the cost of repairing the device due to circuit board damage.

[0059] In some embodiments, the flexible circuit board 10 includes a radio frequency line 105 and a signal line; the first fixing member 2 and the second fixing member 3 have less than a threshold effect on the high-frequency radio frequency signal transmitted by the radio frequency line 105.

[0060] A flexible circuit board 10 is arranged inside the mobile phone, running through the hinge area. The flexible circuit board 10 integrates radio frequency (RF) lines 105 for transmitting high-frequency RF signals. RF lines 105 can be used to connect the antenna on the first body 30 to the RF chip in the second body 40. Signal lines can also be used to connect a first interface on the first circuit board of the first body 30 to a second interface on the second circuit board of the second body 40. This enables the mobile phone's communication functions (such as 5G, WiFi, etc.), and also includes signal lines for transmitting control signals, data signals, etc.

[0061] The first fixing member 2 and the second fixing member 3 can be made of special low electromagnetic interference materials, such as plastics with good electromagnetic shielding properties. The first fixing member 2 is fixed to the frame inside the first body 30, and the second fixing member 3 is fixed to the frame inside the second body 40. The presence of the first eaves 202 and the second eaves 302 not only constrains the deformation of the free segment 103 and protects the radio frequency line 105 from excessive bending or compression, but also ensures its transmission performance.

[0062] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A flexible printed circuit board, characterized in that, Comprising: A carrier board formed by multiple circuits; A first connection end located at the first end of the carrier board; A second connection end located at the second end of the carrier board; A first fixing member fixed at a first position on the first surface of the carrier board, the first position being close to the first end; A second fixing member fixed at a second position on the first surface of the carrier board, the second position being close to the second end, and the free section of the carrier board being between the first fixing member and the second fixing member; The first fixing member includes a first eaves body, and the first eaves body faces the second position; The second fixing member includes a second eaves body, and the second eaves body faces the first position, and the first eaves body and the second eaves body are used to restrict the deformation of the free section.

2. The flexible circuit board according to claim 1, wherein: The first connection end is used to connect to a third connection end of an assembled electronic device, and the second connection end is used to connect to a fourth connection end of the assembled electronic device; The first position is used to fixedly connect to a third fixing member of the assembled electronic device, and the second position is used to fixedly connect to a fourth fixing member of the assembled electronic device; Wherein, the free section of the carrier board changes with the change in the form of the electronic device.

3. The flexible circuit board according to claim 1, wherein: The multiple circuits include circuits of a first category and circuits of a second category, and the first category is different from the second category.

4. The flexible circuit board according to claim 3, wherein: The circuits of the first category are power lines for transmitting power signals, and the circuits of the second category are radio frequency lines for transmitting radio frequency signals; The radio frequency lines are connected to one side of the power lines, and the first surface of the carrier board has the appearance surface of the radio frequency lines.

5. The flexible circuit board according to claim 4, wherein: The first fixing member and the second fixing member are epoxy glass cloth laminates, and the influence of the first fixing member and the second fixing member on the high-frequency radio frequency signals transmitted by the radio frequency lines is lower than a threshold value.

6. The flexible circuit board according to claim 2, wherein: The first fixing member further includes a first plate body, and the first eaves body extends from one side of the first plate body facing the second position, and the first plate body is used to fixedly connect to the third fixing member; The second fixing member further includes a second plate body, and the second eaves body extends from one side of the second plate body facing the first position, and the second plate body is used to fixedly connect to the fourth fixing member; Wherein, the surface of the free section facing the first eaves body and the second eaves body is movably connected to the first eaves body and the second eaves body.

7. The flexible circuit board according to claim 6, wherein: The length dimension of the first plate body is greater than the width dimension of the free section, and the length dimension of the first eaves body is adapted to the width dimension of the free section; The length dimension of the second plate body is greater than the width dimension of the free section, and the length dimension of the second eaves body is adapted to the width dimension of the free section.

8. An electronic device, characterized in that, Comprising: A connecting device; A first body; A second body, wherein the first body and the second body are rotationally connected by the connecting device; A flexible printed circuit board, wherein a first fixing member of the flexible printed circuit board is relatively fixed to the first body, and a second fixing member of the flexible printed circuit board is relatively fixed to the second body to form a free section of the flexible printed circuit board between the first fixing member and the second fixing member; the free section passes through the connecting device and deforms as the form of the electronic device changes; a first eaves body of the first fixing member corresponds to the free section, a second eaves body of the second fixing member corresponds to the free section, and the first eaves body and the second eaves body are used to restrict the deformation of the free section.

9. The electronic device according to claim 8, wherein When the electronic device is in a first posture where the first body is stacked on the second body, the free section is in a taut state; When the electronic device is in a second posture where the first body is not stacked on the second body, the free section is in a relaxed state, the first eaves body is used to restrict the deformation of the free section in the relaxed state towards the first eaves body, and the second eaves body is used to restrict the deformation of the free section in the relaxed state towards the second eaves body.

10. The electronic device according to claim 8 or 9, wherein The flexible printed circuit board includes a radio frequency line and a signal line; The influence of the first fixing member and the second fixing member on the high-frequency radio frequency signal transmitted by the radio frequency line is lower than a threshold value.

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