An inter-board flexible transmission line structure, movable device control circuit, and movable device

Abstract

The application discloses an inter-board flexible transmission line structure, a movable device control circuit and a movable device. The inter-board flexible transmission line structure is used for connecting a master board and a slave board, the master board and the slave board can rotate relative to each other, and comprises a first connector, a second connector and a flexible transmission line. The first connector is located on the master board and is used for being connected with a master board circuit on the master board. The second connector is located on the slave board and is used for being connected with a slave board circuit on the slave board. One end of the flexible transmission line is connected with the first connector, and the other end of the flexible transmission line is connected with the second connector. The flexible transmission line adopts a flexible flat cable. The flexible flat cable is used as the flexible transmission line to connect the master board and the slave board, the overall width of the transmission line structure is reduced, the torsional stress is more dispersed, the stress is more dispersed when the flexible flat cable is twisted, and the signal transmission reliability between the structures of the split type electronic device which can rotate relative to each other is improved.

Description

Technical Field

[0001] This invention relates to the field of transmission line technology, and in particular to a flexible inter-board transmission line structure, a control circuit for movable equipment, and a movable device. Background Technology

[0002] As electronic devices become increasingly feature-rich and integrated, users are demanding greater functionality and ease of interaction. Specifically, to further enhance the coverage of electronic devices, some devices incorporate movable structures. These devices typically employ a split design, dividing the device into multiple relatively movable parts. When the electronic device is operating, these parts can move relative to each other, and these parts are electrically connected via circuitry in the hardware design.

[0003] However, in split electronic devices, the connection structure needs to maintain stable electrical contact during repeated rotation to avoid signal interruption or attenuation due to mechanical movement. Flexible printed circuit boards (FPCs) can achieve a certain degree of bending and have good electromagnetic shielding capabilities, reducing electromagnetic interference (EMI) problems. However, they are mainly suitable for fixed structures or limited bending scenarios. In devices where the upper and lower parts need to rotate frequently or continuously relative to each other, the width of the FPC increases significantly when the number of signals is large. The FPC is easily damaged by torsion and compression, making it difficult to achieve reliable rotation in a compact space, resulting in reduced transmission stability.

[0004] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a flexible transmission line structure between boards, a control circuit for movable equipment, and a movable equipment, so as to solve the problem that the flexible printed circuit boards used in existing movable electronic devices are easily deformed and damaged by torsion and compression during movement, making it difficult to achieve reliable rotation and resulting in reduced transmission stability.

[0006] The technical solution of the present invention is as follows: This invention provides a flexible inter-board transmission line structure for connecting a motherboard and a slave board, wherein the motherboard and the slave board are rotatable relative to each other, comprising: The first connector is located on the motherboard and is used to connect to the motherboard circuitry on the motherboard. The second connector, located on the slave board, is used to connect to the slave board circuitry on the slave board. A flexible transmission line, one end of which is connected to the first connector and the other end of which is connected to the second connector; the flexible transmission line is a flexible flat cable.

[0007] In a further embodiment of the present invention, the flexible transmission line includes at least one multi-signal harness group, a first pin structure, and a second pin structure, with each of the multi-signal harness groups arranged in parallel; and one end of each multi-signal harness group is connected to the first pin structure, the first pin structure is connected to the first connector, and the second pin structure is connected to the second connector.

[0008] A further feature of the present invention includes a sound-absorbing foam layer, which is wound around the flexible transmission line to shield against vibration interference.

[0009] In a further embodiment of the present invention, the flexible transmission line includes a first independent wire bundle and a plurality of isolation wire bundles, the first independent wire bundle and the isolation wire bundles being arranged in parallel, and the first independent wire bundle including a plurality of compactly arranged signal transmission lines; The isolation harness is wrapped with a conductive cloth layer, which includes several tightly arranged signal transmission lines. The conductive cloth layer is used to shield electromagnetic interference.

[0010] In a further embodiment of the present invention, a first conductive shielding layer is provided on the outer surface of the flexible transmission line near the first connector. The first conductive shielding layer is connected to the conductive cloth layer and grounded through the first connector. The flexible transmission line has a second conductive shielding layer on its outer surface near the second connector. The second conductive shielding layer is connected to the conductive cloth layer and grounded through the second connector.

[0011] In a further embodiment of the present invention, the first conductive shielding layer and the second conductive shielding layer are aluminum foil layers. When the flexible transmission line is inserted into the first connector and the second connector, the first conductive shielding layer is connected to the grounding terminal of the first connector, and the second conductive shielding layer is connected to the grounding terminal of the second connector.

[0012] In a further embodiment of the present invention, the flexible transmission line further includes an insulating dielectric layer disposed on the upper and lower surfaces of the isolation wire bundle, for isolating the isolation wire bundle and the conductive cloth layer.

[0013] In a further embodiment of the present invention, the signal transmission line includes a conductor core and an insulating layer, the insulating layer being disposed around the circumferential surface of the conductor core; the conductor core is one of oxygen-free copper core, tin-plated copper core, and silver-plated copper core, and the insulating layer is one of polyester insulating layer, polyimide insulating layer, and polyvinyl chloride insulating layer.

[0014] Based on the same inventive concept, the present invention also provides a control circuit for a movable device, comprising: an integrated control module, a drive module, a main board functional module, a slave board functional module, and the aforementioned inter-board flexible transmission line structure; wherein... The drive module and the motherboard functional module are respectively connected to the integrated control module. The drive module is used to drive the motherboard to rotate relative to the slave board. The integrated control module is mounted on the motherboard and connected to the first connector of the inter-board flexible transmission line structure. It is used to control the working state of the drive module and the motherboard functional module. The slave board functional module is mounted on the slave board and is connected to the second connector of the inter-board flexible transmission line structure; the integrated control module is used to control the working state of the slave board functional module through the inter-board flexible transmission line structure.

[0015] Based on the same inventive concept, the present invention provides a movable device, which includes a moving part, a fixed part, and the aforementioned movable device control circuit. The moving part is provided with a main board, and the fixed part is provided with a slave board. The driving module is connected to the moving part and the fixed part respectively, and is used to drive the moving part to rotate relative to the fixed part. The rotation center of the fixed part is provided with a fixed through hole, and the rotation center of the moving part is provided with a moving through hole. The fixed through hole and the moving through hole are connected. The flexible transmission line of the inter-board flexible transmission line structure is connected to the main board and passes through the fixed through hole and the moving through hole to connect with the slave board.

[0016] This invention discloses an inter-board flexible transmission line structure, a movable device control circuit, and a movable device. The inter-board flexible transmission line structure is used to connect a motherboard and a slave board, which are rotatable relative to each other. It includes: a first connector located on the motherboard for connecting to a motherboard circuit on the motherboard; a second connector located on the slave board for connecting to a slave board circuit on the slave board; and a flexible transmission line, one end of which is connected to the first connector, and the other end of which is connected to the second connector. The flexible transmission line is a flexible flat cable. This invention uses a flexible flat cable as the flexible transmission line to connect the motherboard and the slave board, reducing the overall width of the transmission line structure, making its torsional stress more dispersed, and improving the reliability of signal transmission between the structures of the split, relatively rotatable electronic device. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the flexible transmission line structure between boards in this invention.

[0019] Figure 2 This is a schematic diagram of the structure of the multi-signal harness group in this invention.

[0020] Figure 3 This is a schematic diagram of the flexible transmission line with a silent foam layer in this invention.

[0021] Figure 4 This is a cross-sectional schematic diagram of the first connector connected to the flexible transmission line in this invention.

[0022] Figure 5 This is a schematic diagram of the structure of the second connector in the present invention when it is connected to the flexible transmission line.

[0023] Figure 6 This is a schematic diagram of the control circuit module for movable equipment in this invention.

[0024] Figure 7 This is a schematic diagram of the movable device in this invention.

[0025] Figure 8 This is a schematic diagram of the internal control circuit of the movable device in this invention.

[0026] The following are the markings in the attached diagram: 100, First connector; 200, Second connector; 210, Grounding terminal; 300, Flexible transmission line; 310, Multi-signal harness group; 311, First independent harness; 312, Isolation harness; 320, First pin structure; 330, Second pin structure; 340, Noise-reducing foam layer; 350, First conductive shielding layer; 360, Second conductive shielding layer; 370, Conductive cloth layer; 1, Integrated control module; 2, Drive module; 3, Main board functional module; 4, Slave board functional module; 5, Inter-board flexible transmission line structure; 10, Main board; 20, Slave board; 30, Moving part; 40, Fixing part. Detailed Implementation

[0027] This invention provides a flexible transmission line structure between boards, a control circuit for movable equipment, and a movable equipment. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0028] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of the present invention involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0029] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0030] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0031] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0032] The inventors discovered that as electronic devices become increasingly feature-rich and integrated, users demand greater versatility and ease of interaction. For example, some multi-functional devices without screens can connect to external displays for image display and control by adding an HDMI port. Simultaneously, to expand visual perception functions such as monitoring, some existing electronic devices integrate cameras while maintaining their current functionality, and support rotating structures for wider image acquisition. These devices typically employ a split-type design, dividing the device into at least two relatively rotatable parts. The rotatable part houses components such as the camera and display screen for multi-angle adjustment, while the other part houses basic functions like interfaces and power supply modules. To accommodate this split-rotation physical form, the hardware design often divides the printed circuit board into upper and lower independent boards, which are electrically connected via transmission lines to ensure stable signal and power transmission.

[0033] In modular electronic devices, especially when the device needs to simultaneously support high-bandwidth signal transmission (such as HDMI, USB, and other high-speed signals) and a relatively rotating mechanical structure, it is crucial to ensure that the electrical connection scheme between the boards achieves flexibility in mechanical rotation, integrity in signal transmission, and reliability in long-term system operation. On one hand, the connection structure must ensure stable electrical contact during rotation to prevent signal interruption or attenuation caused by torsion due to mechanical movement. On the other hand, high-speed signals have stringent requirements for impedance matching, shielding performance, and signal integrity in the transmission path. Any reflections, crosstalk, or external interference introduced by improper connection methods can lead to signal quality degradation, making it difficult to meet high-speed communication standards. To address these issues, some existing technologies use flexible printed circuit boards (FPCs) for connection. However, while FPCs can achieve a certain degree of bending, their hierarchical structure only makes them suitable for fixed structures or limited bending scenarios. In devices where the upper and lower parts need frequent or continuous relative rotation, they are prone to deformation or even damage due to torsion and compression. Furthermore, when the number of signals is large, the width of the FPC increases significantly, making reliable rotation difficult to achieve within a limited space. In addition, existing technologies also offer a solution using wire harnesses. While bundling multiple wires and passing them through the rotating structure improves mechanical flexibility to some extent, the connectors and cables used in these harnesses generally lack shielding design and precise impedance control for high-speed signals. This makes it difficult to meet the transmission requirements of high-speed signals such as HDMI and USB, easily leading to eye diagram test failures and compromising signal integrity. Furthermore, there are solutions using coaxial cables as the connection medium. While this solution can meet the requirements of high-speed signal transmission and rotation, its material and manufacturing costs are high, hindering large-scale application and cost control. Therefore, existing technologies lack an electrical connection solution that can balance rotational freedom, high-speed signal integrity, and low-cost manufacturability.

[0034] To solve the technical problems existing in the current technology, such as Figure 1 As shown, the present invention provides a flexible transmission line structure 5 between boards for connecting a main board 10 and a slave board 20, wherein the main board 10 and the slave board 20 are rotatable relative to each other, comprising: a first connector 100 located on the main board 10 for connecting to the main board 10 circuit on the main board 10; a second connector 200 located on the slave board 20 for connecting to the slave board 20 circuit on the slave board 20; and a flexible transmission line 300, one end of which is connected to the first connector 100, and the other end of which is connected to the second connector 200; the flexible transmission line 300 is a flexible flat cable (FFC).

[0035] The main board 10 and slave board 20 can be any type of printed circuit board. The relative rotation between the main board 10 and slave board 20 can be achieved in any form; that is, the slave board 20 can remain stationary while the main board 10 rotates relative to it; or the main board 10 can remain stationary while the slave board 20 rotates relative to it; or both the main board 10 and slave board 20 can be in motion, with the main board 10 rotating relative to the slave board 20. It should be noted that the movement trajectories of the main board 10 and slave board 20 can be coaxial or off-axis. Therefore, in the working state, the relative movement between the main board 10 and slave board 20 can cause the flexible transmission line 300 to twist, thereby generating shear stress in the flexible transmission line 300 under torque. The flexible transmission line 300 is constructed using a flexible flat cable, which is formed by encapsulating multiple parallel conductors. Its structure can be implemented using any existing flexible deformable cable, and specific details will not be elaborated further. Since one end of the flexible transmission line 300 is connected to the motherboard 10 through the first connector 100, and the other end of the flexible transmission line 300 is connected to the slave board 20 through the second connector 200, when the motherboard 10 and the slave board 20 rotate relative to each other, the flexible transmission line 300 is twisted synchronously. The several parallel wires inside it can move relative to each other at a micro level, and it is not easy for the internal circuit to break or the signal to be interrupted due to the overall torsional deformation. While meeting the requirements of torsional applications, the production and processing cost of the flexible flat cable solution is much lower than that of flexible printed circuit boards, making it suitable for mass production.

[0036] In some preferred embodiments, such as Figure 2 , Figure 4 and Figure 5As shown, the flexible transmission line 300 includes at least one multi-signal harness group 310, a first pin structure 320, and a second pin structure 330, with each multi-signal harness group 310 arranged in parallel. One end of each multi-signal harness group 310 is connected to the first pin structure 320, the first pin structure 320 is connected to the first connector 100, and the second pin structure 330 is connected to the second connector 200. The multi-signal harness group 310 is used to collect and transmit data signals and commands from the motherboard 10 and output them to the slave board 20. Simultaneously, it can also be used to collect and transmit data signals and commands from the slave board 20 and output them to the motherboard 10. The first pin structure 320 is wound around the end of the multi-signal harness group 310 near the first connector 100, and the second pin structure 330 is wound around the end of the multi-signal harness group 310 near the second connector 200. When the flexible transmission line 300 is fixed to the first connector 100 and the second connector 200, the first pin structure 320 is connected to the circuit on the motherboard 10 through the first connector 100, and the second pin structure 330 is connected to the circuit on the slave board 20 through the second connector 200. Preferably, the first connector 100 and the second connector 200 can be ZIF (Zero Insertion Force) connectors, or any connector with a locking structure to fix the flexible transmission line 300, to strengthen the locking between the flexible transmission line 300 and the first connector 100 and the second connector 200.

[0037] In a further embodiment of a preferred embodiment of the present invention, the flexible transmission line 300 includes a first independent wire bundle 311 and a plurality of isolation wire bundles 312. The first independent wire bundle 311 and the isolation wire bundles 312 are arranged in parallel. The first independent wire bundle 311 includes a plurality of compactly arranged signal transmission lines. A conductive cloth layer 370 is wrapped around the isolation wire bundles 312, which includes a plurality of compactly arranged signal transmission lines. The conductive cloth layer 370 is used to shield electromagnetic interference. The flexible transmission line 300 is used to transmit high-speed signals. It should be noted that the high-speed signal is preferably a signal with a data transmission rate of 6Gbps or higher, but other signals with data transmission rates conforming to the definition of a high-speed signal can also be used, such as any signal greater than 50MHz. Simultaneously, the flexible transmission line 300 can also be used to transmit low-speed signals, and its actual use is not limited. For example, the signals output by the cable can currently include HDMI signals, USB signals, Ethernet signals, control signals, power signals, ground signals, etc. Furthermore, this includes at least one high-speed signal. Since high-speed signals are differential signals, the signal transmission lines need to be arranged side-by-side to reduce mutual interference between signal lines. Therefore, in the first independent wire bundle 311 and the isolation wire bundle 312, the high-speed signals are grouped together. It should be noted that the "tight arrangement" refers to side-by-side or parallel arrangement. Further, it can also refer to an arrangement scheme with minimal space occupation in two-dimensional or three-dimensional space, minimizing space occupation and maximizing space utilization. For example, the flexible transmission line 300 uses a 40-pin FFC cable. If 40-pin FFC cables are arranged side-by-side, the width of the flexible transmission line 300 will be greatly increased, making it prone to deformation and breakage when twisted. Therefore, by dividing it into four groups of 10-pin wire bundles and routing them together, in each group, the 10-pin signal transmission lines are arranged compactly with each other, improving anti-interference capability while reducing the overall radius of the wire bundle. In this way, the four groups of wires are stacked together to form the flexible transmission line 300, reducing the overall width of the flexible transmission line 300.

[0038] When the high-speed signal is transmitted through the flexible transmission line 300, it is easily affected by external electromagnetic interference. Therefore, by laying a conductive cloth layer 370 on the outside of each wire bundle, it is possible to prevent the internal high-speed signals from radiating outward and interfering with each other, and to protect the high-speed signals from being affected by external interference signals. In some preferred embodiments, the wire arrangement structure inside the first independent wire bundle 311 and the isolation wire bundle 312 is completely identical. The difference is that a conductive cloth layer 370 is laid on the outside of each isolation wire bundle 312. The conductive cloth layer 370 can be obtained by wrapping conductive cloth or by using other laying methods. Since the more conductive fabric wrapped around the wires, the thicker the overall conductive fabric layer 370 becomes, and consequently the stiffer the wire harness, in this embodiment, the stiffness of the flexible transmission line 300 can be reduced by laying the first independent wire harness 311. Because the isolation wire harnesses 312 are evenly covered with conductive fabric layers 370, the high-speed signals transmitted within each isolation wire harness 312 will not affect the signal transmission in the external first independent wire harness 311. Therefore, the first independent wire harness 311 may not have a conductive fabric layer 370 laid on it, thereby improving the flexibility and reliability of the flexible transmission line 300. Alternatively, the first independent wire harness 311 can also be wrapped with a conductive fabric layer 370 to further improve shielding performance.

[0039] Conductive fabric is a functional fabric with conductive properties. In some embodiments, its structure includes a substrate and a conductive layer. The substrate is typically a common fiber fabric such as polyester or nylon, which has good mechanical and processing properties, providing the conductive fabric with basic strength and flexibility. The conductive layer is generally achieved by plating with a metal coating or coating with a conductive substance. The plating metal coating includes nickel, copper, silver, or combinations thereof; the coating conductive substance includes coatings containing carbon black, graphite, metal particles, or conductive polymers. Furthermore, some conductive fabrics are directly woven from fibers that are inherently conductive, such as stainless steel fibers, carbon fibers, or metal-plated fibers, or blended or interwoven with common fibers. Specifically, for several high-speed signals, they can be grouped into several bundles to further reduce the distance between each signal, thereby reducing the loop area between signals and reducing interference between signal transmission lines within the bundle. In some preferred embodiments, the flexible transmission line 300 further includes an insulating dielectric layer disposed on the upper and lower surfaces of the isolation wire harness 312, used to isolate the isolation wire harness 312 from the conductive cloth layer 370. Exemplarily, the insulating dielectric layer can be a polypropylene (PP) layer. In implementation, a 0.1mm thick PP film is first applied to both sides of the isolation wire harness 312. The insulating dielectric layer isolates the conductor of the wire harness 312 from the outer conductive cloth layer 370, preventing direct contact between the conductive cloth layer 370 and the inner conductor, thus avoiding short circuits or leakage. It also provides a flexible buffer, reducing stress concentration between the shielding layer and the inner wire harness during bending and vibration, improving the overall bending resistance and service life of the wire harness.

[0040] The signal transmission line includes a conductor core and an insulating layer, with the insulating layer surrounding the circumferential surface of the conductor core. The conductor core is one of oxygen-free copper, tin-plated copper, or silver-plated copper, and the insulating layer is one of polyester, polyimide, or polyvinyl chloride. Preferably, the signal transmission line uses 0.035mm oxygen-free copper wrapped with PI material, and then an outermost layer of conductive cloth. This provides the necessary flexibility for rotation and prevents breakage. Alternatively, any other existing signal transmission line and / or conductor structure can be used for high-speed signal transmission on the board, which will not be elaborated further here.

[0041] In further embodiments of some preferred embodiments of the present invention, such as Figure 3 As shown, the inter-board flexible transmission line structure 5 also includes a sound-absorbing foam layer 340, which is wound around the flexible transmission line 300 to shield against vibration interference. Specifically, it can... Figure 2A sound-dampening foam layer 340 is wound around the multi-signal harness group 310 shown. In the sound-dampening foam layer 340, the first independent harness 311 and the isolation harness 312 of the multi-signal harness group 310 are arranged compactly to minimize the diameter of the flexible transmission line 300. The sound-dampening foam is used to reduce the interference of external environmental vibration or resonance on signal transmission and reduce noise generated in the simulation.

[0042] Furthermore, the flexible transmission line 300 has a first conductive shielding layer 350 on its outer surface near the first connector 100. The first conductive shielding layer 350 is connected to the conductive cloth layer 370 and grounded through the first connector 100. The flexible transmission line 300 also has a second conductive shielding layer 360 on its outer surface near the second connector 200. The second conductive shielding layer 360 is connected to the conductive cloth layer 370 and grounded through the second connector 200. Preferably, the first conductive shielding layer 350 and the second conductive shielding layer 360 are aluminum foil layers. When the flexible transmission line 300 is inserted into the first connector 100 and the second connector 200, the first conductive shielding layer 350 is connected to the grounding terminal 210 of the first connector 100, and the second conductive shielding layer 360 is connected to the grounding terminal 210 of the second connector 200. In addition, the first conductive shielding layer 350 and the second conductive shielding layer 360 can also be one or more of the shielding materials such as copper foil, silver paste shielding layer, conductive adhesive or conductive foam. By short-circuiting the common mode current to ground, a low impedance discharge path is formed, reducing the interference at the connection end of the flexible transmission line 300 with the first connector 100 and the second connector 200.

[0043] Based on the same inventive concept, such as Figure 6As shown, the present invention also provides a movable device control circuit, which includes: an integrated control module 1, a drive module 2, a main board function module 3, a slave board function module 4, and the aforementioned inter-board flexible transmission line structure 5; wherein, the drive module 2 and the main board function module 3 are respectively connected to the integrated control module 1, and the drive module 2 is used to drive the main board 10 to rotate relative to the slave board 20; the integrated control module 1 is disposed on the main board 10 and connected to the first connector 100 of the inter-board flexible transmission line structure 5, and is used to control the working state of the drive module 2 and the main board function module 3; the slave board function module 4 is disposed on the slave board 20, and the slave board function module 4 is connected to the second connector 200 of the inter-board flexible transmission line structure 5; the integrated control module 1 is used to control the working state of the slave board function module 4 through the inter-board flexible transmission line structure 5. The integrated control module 1 can be a system-on-chip (SOC). The motherboard functional module 3 and the slave board functional module 4 can be configured according to actual needs. For example, the motherboard functional module 3 can be a camera module or a display module to realize camera or display functions. It can also use other functions that can be set by electronic devices, which will not be elaborated here. Correspondingly, the slave board functional module 4 can be used to realize basic functions, such as power access or data access functions. For example, it can include at least one or more of the data transmission interfaces such as USB interface, HDMI interface and RJ45 interface. At the same time, the slave board functional module 4 can also be used to connect to a power source for charging, so it can also be set to any power access interface, or set to a wireless data transmission terminal, etc., as described in the specific embodiment of the inter-board flexible transmission line structure 5, which will not be elaborated here.

[0044] Based on the same inventive concept, such as Figure 7 and Figure 8 As shown, the present invention provides a movable device, which includes a moving part 30, a fixed part 40, and the movable device control circuit described above. A main board 10 is disposed inside the moving part 30, and a slave board 20 is disposed inside the fixed part 40. A drive module 2 is connected to both the moving part 30 and the fixed part 40, and is used to drive the moving part 30 to rotate relative to the fixed part 40. A fixed through hole is provided at the rotation center of the fixed part 40, and a moving through hole is provided at the rotation center of the moving part 30. The fixed through hole and the moving through hole are connected. A flexible transmission line 300 of the inter-board flexible transmission line structure 5 is connected to the main board 10 and passes through the fixed through hole and the moving through hole to connect to the slave board 20. The specific implementation is as described in the specific embodiment of the inter-board flexible transmission line structure 5, and will not be repeated here. The present invention discloses an inter-board flexible transmission line structure, a movable device control circuit, and a movable device, the beneficial effects of which are: To address the issues of rotational reliability, high-speed signal transmission, and cost, a flexible flat cable solution was adopted. The flexible flat cable was divided into multiple groups according to signal distribution, reducing cable width and facilitating rotation. The flexible flat cable allows control over the characteristic impedance of the signal lines, meeting the differential impedance requirements of high-speed signals. Simultaneously, each group of lines is shielded with conductive cloth, and aluminum foil is attached to the ends of the conductive cloth at both ends of the cable. When the connector is engaged, the aluminum foil contacts the grounding pin of the connector, ensuring a stable grounding connection between the conductive cloth and the board, improving the signal-to-noise ratio and reducing external interference. The manufacturing cost of the flexible flat cable is significantly lower than that of the coaxial cable solution, facilitating practical manufacturing.

[0045] Using flexible flat cables as flexible transmission lines to connect the motherboard and slave board reduces the overall width of the transmission line structure, making its torsional stress more dispersed, thus improving the reliability of signal transmission between the structures of split, relatively rotatable electronic devices.

[0046] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A flexible transmission line structure between boards, characterized in that, For connecting a motherboard and a slave board, wherein the motherboard and slave board are rotatable relative to each other, including: The first connector is located on the motherboard and is used to connect to the motherboard circuitry on the motherboard. The second connector, located on the slave board, is used to connect to the slave board circuitry on the slave board. A flexible transmission line, one end of which is connected to the first connector and the other end of which is connected to the second connector; the flexible transmission line is a flexible flat cable.

2. The inter-board flexible transmission line structure according to claim 1, characterized in that, The flexible transmission line includes at least one multi-signal harness group, a first pin structure, and a second pin structure, with each multi-signal harness group arranged in parallel; one end of each multi-signal harness group is connected to the first pin structure, the first pin structure is connected to the first connector, and the second pin structure is connected to the second connector.

3. The inter-board flexible transmission line structure according to claim 1, characterized in that, It also includes a sound-absorbing foam layer, which is wound around the flexible transmission line to shield against vibration interference.

4. The inter-board flexible transmission line structure according to claim 1, characterized in that, The flexible transmission line includes a first independent wire bundle and several isolation wire bundles, the first independent wire bundle and the isolation wire bundles are arranged in parallel, and the first independent wire bundle includes several compactly arranged signal transmission lines; The isolation harness is wrapped with a conductive cloth layer, which includes several tightly arranged signal transmission lines. The conductive cloth layer is used to shield electromagnetic interference.

5. The inter-board flexible transmission line structure according to claim 4, characterized in that, The flexible transmission line has a first conductive shielding layer on its outer surface near the first connector. The first conductive shielding layer is connected to the conductive cloth layer and is grounded through the first connector. The flexible transmission line has a second conductive shielding layer on its outer surface near the second connector. The second conductive shielding layer is connected to the conductive cloth layer and grounded through the second connector.

6. The inter-board flexible transmission line structure according to claim 5, characterized in that, The first conductive shielding layer and the second conductive shielding layer are aluminum foil layers. When the flexible transmission line is inserted into the first connector and the second connector, the first conductive shielding layer is connected to the grounding terminal of the first connector, and the second conductive shielding layer is connected to the grounding terminal of the second connector.

7. The inter-board flexible transmission line structure according to claim 4, characterized in that, The flexible transmission line also includes an insulating dielectric layer, which is disposed on the upper and lower surfaces of the isolation wire bundle to isolate the isolation wire bundle and the conductive cloth layer.

8. The inter-board flexible transmission line structure according to claim 4, characterized in that, The signal transmission line includes a conductor core and an insulating layer, the insulating layer being disposed around the circumferential surface of the conductor core; the conductor core is one of oxygen-free copper core, tin-plated copper core, and silver-plated copper core, and the insulating layer is one of polyester insulating layer, polyimide insulating layer, and polyvinyl chloride insulating layer.

9. A control circuit for a movable device, characterized in that, include: The system integrates a control module, a driver module, a motherboard functional module, a slave board functional module, and an inter-board flexible transmission line structure as described in any one of claims 1 to 8; wherein... The drive module and the motherboard functional module are respectively connected to the integrated control module. The drive module is used to drive the motherboard to rotate relative to the slave board. The integrated control module is mounted on the motherboard and connected to the first connector of the inter-board flexible transmission line structure. It is used to control the working state of the drive module and the motherboard functional module. The slave board functional module is mounted on the slave board and is connected to the second connector of the inter-board flexible transmission line structure; the integrated control module is used to control the working state of the slave board functional module through the inter-board flexible transmission line structure.

10. A movable device, characterized in that, The device includes a moving part, a fixed part, and a movable device control circuit as described in claim 9. The moving part has a main board inside, and the fixed part has a slave board inside. The driving module is connected to the moving part and the fixed part respectively, and is used to drive the moving part to rotate relative to the fixed part. The rotation center of the fixed part has a fixed through hole, and the rotation center of the moving part has a moving through hole. The fixed through hole and the moving through hole are connected. The flexible transmission line of the inter-board flexible transmission line structure is connected to the main board and passes through the fixed through hole and the moving through hole to connect to the slave board.

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