A scissor folding hinge structure based on flexible polyimide substrate and radiator

Abstract

The application relates to a scissor type folding hinge structure based on a flexible polyimide base material and a radiator, and belongs to the technical field of flexible electronic devices. The device lays a flexible base material on a left clamping plate and a right clamping plate, and a bending area is formed between the two plates; a main rotating shaft is arranged on the left clamping plate, a rotating sleeve is sleeved on the main rotating shaft and connected with the right clamping plate; two guide rollers are arranged on the two sides of the bending area; two scissor arms are cross matched, and a guide relationship is formed through a guide tongue, a floating window, a sliding pin and a guide groove; a fixed electrode is connected with the main rotating shaft, a rotating electrode is connected with the rotating sleeve, and a coupling gap is formed between the two electrodes. The application solves the technical problems that in the existing flexible base material folding structure, the left and right clamping components are insufficient in synchronism, the bending area is easy to approach a rigid edge to form a small bending radius, and the radiation conductive structure is greatly affected by the folding action, realizes controlled folding of the flexible base material, and helps to improve the use stability of the radiator structure.

Description

Technical Field

[0001] This invention relates to the field of flexible electronic device technology, specifically to a scissor-type folding hinge structure and radiator based on a flexible polyimide substrate. Background Technology

[0002] Flexible polyimide substrates, with their excellent bending durability and thermal stability, have been widely used in foldable electronic components and radiator structures. In practical engineering, these substrates are typically deployed and retracted using clamping plates, pivots, or linkage mechanisms to ensure the rigidity and operability of the overall structure. However, while existing assembly schemes are convenient for production, they fail to adequately consider the mechanical response characteristics of flexible substrates during bending: localized stress concentrations often occur at the edges of rigid plates or pivot connections, leading to positional drift in the bending zone and difficulty in maintaining a constant bending radius, severely affecting the controllability of the folding trajectory; simultaneously, the left and right clamping components are prone to posture deviation or slippage during relative rotation, further exacerbating folding instability and reducing the reliability and consistency of the mechanism in long-term use.

[0003] For flexible substrates with integrated radiation functions, there is a more complex coupling relationship between the conductive pattern layout and the folding motion. When the feeding radiation strips, coupling radiation strips, or conductive connection segments cross the bending zone, these conductive structures will undergo periodic tensile and compressive deformation due to repeated bending of the substrate. This may not only cause drift in electrical performance parameters but also easily lead to dynamic changes in the coupling spacing between radiation strips with the folding angle, thereby interfering with the preset electromagnetic matching state and radiation pattern stability. Especially under multi-band or high-gain radiation requirements, the impact of the folding process on radiation performance is particularly significant, necessitating coordinated optimization at both the structural design and electromagnetic layout levels to suppress the electrical performance degradation caused by bending.

[0004] To address the aforementioned issues, it is necessary to implement systematic improvements in three aspects: the folding guidance mechanism, the bending zone protection structure, and the radiation zone layout strategy. On the one hand, introducing flexible guide tracks or arc-shaped limiting structures can effectively constrain the bending path and stabilize the bending radius, reducing direct compression of the substrate by rigid components. On the other hand, employing gradient stiffness reinforcement or local thinning designs can alleviate stress concentration in the bending zone and improve fatigue life. Simultaneously, radiation functional areas should be rationally divided, with key radiation units placed in non-bending areas, and cross-zone connecting lines designed as stretchable or serpentine routes to accommodate deformation requirements during the folding process. Combining these measures is expected to improve the mechanical stability and radiation performance consistency of flexible substrates in the folded state, providing reliable technical support for the engineering application of high-performance foldable radiation devices. Summary of the Invention

[0005] The purpose of this invention is to provide a scissor-type folding hinge structure and radiator based on flexible polyimide substrate, so as to solve the technical problem of insufficient synchronization of left and right clamping components in existing flexible substrate folding structures, realize controlled folding of flexible substrate, and help improve the stability of radiator structure in use.

[0006] This invention is achieved through the following technical solution:

[0007] A scissor-type folding hinge structure and radiator based on a flexible polyimide substrate includes: a flexible substrate; a left clamping plate and a right clamping plate, wherein a bending area is formed between the left clamping plate and the right clamping plate, and the flexible substrate is laid on the left clamping plate and the right clamping plate; a main rotating shaft and a rotating sleeve, wherein the main rotating shaft is disposed on the left clamping plate, the rotating sleeve is disposed on the right clamping plate, and the rotating sleeve is sleeved on the outside of the main rotating shaft; a left guide roller and a right guide roller, wherein the left guide roller is disposed on the left clamping plate, and the right guide roller is disposed on the right clamping plate; a left scissor arm and a right scissor arm, wherein the left scissor arm and the right scissor arm are arranged crosswise; The device comprises: a cross guide tongue and a floating window; the cross guide tongue being disposed on the left scissor arm, the floating window being opened on the right scissor arm, and the cross guide tongue passing through the floating window; a right sliding pin, a left sliding pin, a left guide groove, and a right guide groove; the right sliding pin being disposed on the right scissor arm, and the left sliding pin being disposed on the left scissor arm; a fixed electrode and a rotating electrode; the fixed electrode being connected to the main rotating shaft, and the rotating electrode being connected to the rotating sleeve; a feed radiation strip, a coupling radiation strip, a feed pad, and a reference conductive strip; the feed radiation strip being electrically connected to the fixed electrode and the feed pad, and the coupling radiation strip being electrically connected to the rotating electrode. This invention uses left and right clamping plates to support the flexible substrate, and utilizes the main rotating shaft and rotating sleeve to provide the rotation center of the bending area. Combined with the cross arrangement of the left and right scissor arms and the sliding engagement of the sliding pin and guide groove, a defined motion constraint path is provided for the left and right clamping plates during unfolding and folding. Simultaneously, the cross guide tongue and floating window form a floating limiting structure, allowing the scissor arms to adaptively adjust their posture during movement, avoiding rigid jamming. The fixed electrode and rotating electrode rotate relative to each other with the main rotating shaft and rotating sleeve, enabling the signal coupling between the feeding radiation strip and the coupling radiation strip to adapt synchronously with the folding action, without needing to arrange continuous conductive sections across the bending area. Therefore, the overall structure, while ensuring the folding function, provides stable motion support for the flexible substrate and a reasonable layout of the radiation structure, improving the problems of motion instability and electrical performance drift during folding.

[0008] Furthermore, the main rotating shaft is fixedly mounted on the left clamping plate, and the rotating sleeve is fixedly connected to the right clamping plate. The left and right clamping plates are coaxially rotatably connected via the main rotating shaft and the rotating sleeve. This solution ensures that the left and right clamping plates always move around the same axis of rotation during folding and unfolding by fixing the main rotating shaft to the left clamping plate and the rotating sleeve to the right clamping plate, thus eliminating the deviation in motion trajectory caused by shaft eccentricity or assembly deviation. The coaxial rotational connection constrains the relative rotational freedom of the two clamping plates, keeping the centerline position of the bending area constant. This provides stable and repeatable geometric boundary conditions for the flexible substrate during bending, thereby improving the repeatability of the folding action and the consistency of the mechanism during long-term use.

[0009] Furthermore, the left guide roller is positioned on the left clamping plate near the bending area, and the right guide roller is positioned on the right clamping plate near the bending area. The left guide roller is rotatably connected to the left clamping plate, and the right guide roller is rotatably connected to the right clamping plate. The axes of both the left and right guide rollers are parallel to the axis of the main rotating shaft. This design, by positioning the left and right guide rollers on the left and right clamping plates near the bending area respectively, and ensuring that the axes of both rollers are parallel to the axis of the main rotating shaft, allows the flexible substrate to form a smooth arc transition along the outer circumference of the rollers during folding. The rotational freedom of the rollers effectively reduces the sliding friction between the substrate and the guide components, transforming the original sliding contact into rolling contact, thus reducing the risk of wear on the substrate surface. Simultaneously, the parallel axis arrangement ensures that the supporting force of the rollers on the substrate is consistent, resulting in a more uniform stress state in the bending area. This facilitates control of the bending position and minimum bending radius, improving folding durability.

[0010] Furthermore, the bending area of ​​the flexible substrate is located within the guide gap formed between the left guide roller, the right guide roller, the left clamping plate, and the right clamping plate. This solution, by confining the bending area of ​​the flexible substrate within the guide gap formed between the left guide roller, the right guide roller, the left clamping plate, and the right clamping plate, ensures that the substrate is always constrained within a preset geometric channel during the folding process. This prevents lateral movement or local warping of the substrate in the bending area. This guide gap provides sufficient space for the substrate to accommodate bending deformation, and through the combined limiting effect of the rollers and clamping plates on both sides, ensures that the shape and position of the bending area remain highly controllable throughout the folding stroke, thus providing a reliable mechanical boundary for the stable operation of the radial structure across the bending area.

[0011] Furthermore, one end of the left scissor arm is rotatably connected to the left clamping plate, and the other end of the left scissor arm is provided with the left sliding pin, which extends into the right guide groove; one end of the right scissor arm is rotatably connected to the right clamping plate, and the other end of the right scissor arm is provided with the right sliding pin, which extends into the left guide groove; the cross guide tongue is formed in the middle of the left scissor arm, and the floating window is opened in the middle of the right scissor arm. This solution constructs a complete scissor-type linkage mechanism by defining the end connection methods of the left and right scissor arms and the cooperation relationship between the sliding pin and the guide groove. One end of the left scissor arm is rotatably connected to the left clamping plate, and the other end slides in the right guide groove through the left sliding pin. One end of the right scissor arm is rotatably connected to the right clamping plate, and the other end slides in the left guide groove through the right sliding pin. At the intersection, the two are linked with the floating window through the cross guide tongue. When folding, this mechanism can convert the relative rotation of the two clamping plates into the sliding of the sliding pin along the guide groove, thereby precisely controlling the opening and closing angle and movement speed of the two clamping plates, making the bending action smooth and synchronous.

[0012] Furthermore, the floating window has a movable margin along the relative sliding direction of the left and right scissor arms, and both sides of the cross guide tongue have lateral margins with the sidewalls of the floating window. The cross guide tongue and the floating window form a floating cross limiting fit. This invention, by setting a movable margin along the relative sliding direction of the scissor arms in the floating window and reserving lateral margins between the cross guide tongue and the sidewalls of the floating window, forms a floating cross limiting fit. This design ensures that the left and right scissor arms are not rigidly hinged at the intersection, but have a certain range of relative floating capability, thereby adaptively compensating for changes in movement clearance caused by machining errors, assembly deviations, or long-term wear. The floating fit structure avoids jamming or abnormal wear of the scissor arms due to over-constraint during movement, improving the smoothness and service life of the mechanism, while reducing assembly precision requirements, which is beneficial for engineered mass production.

[0013] Furthermore, the left guide groove has a left folding stop end and a left unfolding stop end, and the right guide groove has a right folding stop end and a right unfolding stop end. The right sliding pin abuts against the left folding stop end of the left guide groove in the folded position, and the left sliding pin abuts against the right unfolding stop end of the right guide groove in the unfolded position. Here, by setting folding and unfolding stop ends on the left and right guide grooves respectively, the right and left sliding pins abut against the corresponding stop ends at their extreme positions, thereby precisely defining the two final states of folding and unfolding. This stop structure not only provides the operator with clear tactile feedback on the final position, but more importantly, it ensures that the bending area of ​​the flexible substrate has a definite and controllable geometry in both fully folded and fully unfolded states, avoiding irreversible damage to the flexible substrate and radiating structure caused by excessive bending or stretching, while ensuring the consistency of the electrical performance of the radiator in both working postures.

[0014] Furthermore, a coupling gap is formed between the fixed electrode and the rotating electrode. The fixed electrode is sleeved on the axial end of the main rotating shaft and is conductively connected to the feed radiation strip. The rotating electrode is sleeved on the axial end of the rotating sleeve and is conductively connected to the coupling radiation strip. The fixed electrode and the rotating electrode are arranged opposite each other along the axial direction of the main rotating shaft, and the coupling gap is located between the fixed electrode and the rotating electrode. This invention, by sleeved the fixed electrode on the axial end of the main rotating shaft and conductively connected to the feed radiation strip, and sleeved the rotating electrode on the axial end of the rotating sleeve and conductively connected to the coupling radiation strip, arranges the two opposite each other along the axial direction and forms a coupling gap between them. This axial arrangement fully utilizes the end space of the main rotating shaft and the rotating sleeve, without additionally occupying the surface area of ​​the flexible substrate, which is beneficial for the miniaturization design of the radiator. Simultaneously, the size of the coupling gap is uniquely determined by the axial distance between the fixed electrode and the rotating electrode and does not change with the folding state of the flexible substrate, thereby keeping the electromagnetic coupling between the feed radiation strip and the coupling radiation strip constant and eliminating the interference of folding action on radiation performance.

[0015] Furthermore, the feeding radiating strip is arranged on the left side of the flexible substrate, and the coupling radiating strip is arranged on the right side of the flexible substrate. There is no continuous conductive segment spanning the bending area between the feeding radiating strip and the coupling radiating strip. The feeding pad is connected to the feeding radiating strip. The reference conductive strip is laid on the flexible substrate and is electrically connected to the left clamping plate and the right clamping plate respectively. The reference conductive strip is insulated from the feeding radiating strip and the coupling radiating strip and is arranged at intervals. The reference conductive strip is continuously floating within the bending area. This design arranges the feed radiation strips and coupling radiation strips on the left and right sides of the flexible substrate, respectively, without setting continuous conductive segments across the bending area. This ensures that the main radiating conductive structure completely avoids the bending deformation area, preventing the conductive pattern from cracking or breaking during repeated folding. Simultaneously, the reference conductive strip is laid on the substrate and electrically connected to the left and right clamping plates. It is continuously floating within the bending area, providing a stable reference potential plane for the radiation structure and further enhancing the electromagnetic isolation between the radiation strips. The reference conductive strip is arranged with insulation and spacing from the feed and coupling radiation strips, suppressing parasitic coupling and improving the electromagnetic compatibility and radiation efficiency of the radiator.

[0016] Furthermore, the left scissor arm and the right scissor arm are symmetrically arranged on both sides of the bending area, and the left scissor arm and the right scissor arm are respectively located on the same side or opposite side of the thickness direction of the flexible substrate; the left clamping plate and the right clamping plate are coplanarly arranged in the unfolded state and are relatively close together in the folded state; the left guide roller and the right guide roller constrain the bending trajectory of the flexible substrate from both sides in the folded state, so that the bending area of ​​the flexible substrate is kept within the outer periphery of the left guide roller and the right guide roller. This invention arranges the left and right scissor arms symmetrically on both sides of the bending area, ensuring balanced force on the clamping plates during folding and avoiding posture deviation caused by uneven force on one side. The scissor arms can be positioned on the same or opposite sides of the flexible substrate thickness direction, providing a flexible structural adaptation solution for substrates of different thicknesses or different folding radius requirements. The left and right clamping plates are coplanar in the unfolded state, ensuring the flatness and structural integrity of the radiator during operation. In the folded state, they are relatively close together, and the bending area remains within the outer periphery of the two guide rollers, ensuring reliable arc support for the substrate during folding and protecting the bending area from localized excessive bending damage. This comprehensively improves the structural stability, folding durability, and radiation performance reliability of the device.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention forms a coaxial rotational support through the main rotating shaft and the rotating sleeve, and introduces a composite guiding mechanism of scissor arms, sliding pins and guide grooves to achieve precise constraint on the relative movement of the left and right clamping plates. This structure can provide a definite movement trajectory for the clamping plates throughout the entire unfolding and retracting stroke, suppressing problems such as end misalignment, posture deviation and slippage jamming caused by shaft gaps or uneven force. As a result, the constraint force on the flexible substrate during folding is more uniform and controllable, improving the stability of the mechanism's movement and the accuracy of repeated positioning, and laying a reliable mechanical foundation for the long-term cyclic bending of the substrate.

[0018] 2. Based on the controllable motion path, this invention further adds guide rollers on both sides of the bending area, allowing the flexible substrate to naturally conform to the outer circumference of the rollers during folding, forming a smooth arc transition, rather than directly contacting the edge of the rigid clamping plate and undergoing abrupt bending. This arc-guided method not only accurately defines the position range of the bending area, but also ensures that the minimum bending radius is always higher than the allowable value of the substrate by selecting an appropriate roller radius, thereby avoiding stress concentration caused by excessively small local curvature. Simultaneously, the rolling contact of the rollers reduces frictional damage to the substrate surface, lowers the risk of microcracks or delamination failure caused by repeated bending, and extends the service life of the flexible substrate.

[0019] 3. To address the specific requirements of the radiation function, this invention arranges the feeding radiation strip and the coupling radiation strip on the left and right non-bending areas of the flexible substrate, respectively. Electromagnetic energy transmission is achieved through fixed electrodes, rotating electrodes, and a pre-set coupling gap between them. This arrangement ensures that the main conductive structure completely avoids the bending area, preventing uncontrollable deformation of the radiation strip due to repeated stretching and compression of the substrate. Simultaneously, the coupling gap is maintained by a rigid electrode structure, unaffected by changes in the folding angle, thus ensuring a high degree of consistency between the coupling distance and the impedance matching state. Therefore, the interference of folding action on radiation performance is minimized, and the stability and directionality of the radiator's electrical parameters are maintained. Figure 1 Consistency is effectively guaranteed, making it suitable for engineering applications of foldable radiating devices with stringent performance requirements. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the scissor-type folding hinge structure and radiator based on a flexible polyimide substrate of the present invention. Figure 2 This is a schematic cross-sectional view of the scissor-type folding hinge structure and radiator based on a flexible polyimide substrate of the present invention. Figure 3 This is a schematic diagram of the right scissor arm in this invention; Figure 4 This is a schematic diagram of the rotating sleeve of the present invention; Figure 5 This is a schematic diagram of the cross guide tongue in this invention; Figure 6 This is a schematic diagram of the structure of the left clamping plate in this invention; Figure 7 This is a schematic diagram of the flexible substrate structure in this invention; Figure 8 for Figure 3 Enlarged view of point A in the middle.

[0021] In the diagram: 1. Flexible substrate; 2. Left clamping plate; 3. Right clamping plate; 4. Main shaft; 5. Rotating sleeve; 6. Left guide roller; 7. Right guide roller; 8. Left scissor arm; 9. Right scissor arm; 10. Cross guide tongue; 11. Floating window; 12. Right sliding pin; 13. Left sliding pin; 14. Left guide groove; 15. Right guide groove; 16. Fixed electrode; 17. Rotating electrode; 18. Coupling gap; 19. Feeding radiating strip; 20. Coupling radiating strip; 21. Feeding pad; 22. Reference conductive strip. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] like Figures 1-8As shown, this invention provides a scissor-type folding hinge structure and radiator based on a flexible polyimide substrate, including a flexible substrate 1, a left clamping plate 2, a right clamping plate 3, a main rotating shaft 4, a rotating sleeve 5, a left guide roller 6, a right guide roller 7, a left scissor arm 8, a right scissor arm 9, a cross guide tongue 10, a floating window 11, a right sliding pin 12, a left sliding pin 13, a left guide groove 14, a right guide groove 15, a fixed electrode 16, a rotating electrode 17, a coupling gap 18, a feeding radiation strip 19, a coupling radiation strip 20, a feeding pad 21, and a reference conductive strip 22; a bending area is formed between the left clamping plate 2 and the right clamping plate 3, and the flexible substrate 1 is laid on the left clamping plate 2 and the right clamping plate 3; the main rotating shaft 4 is fixedly disposed on the left clamping plate 2, and the rotating sleeve 5 is sleeved on the outside of the main rotating shaft 4 and fixedly connected to the right clamping plate 3; the left guide roller 6 is provided with The left clamping plate 2 is positioned on the side near the bending area, and the right guide roller 7 is positioned on the side of the right clamping plate 3 near the bending area. The left scissor arm 8 and the right scissor arm 9 are arranged crosswise, and the cross guide tongue 10 is positioned on the left scissor arm 8. The floating window 11 is opened on the right scissor arm 9, and the cross guide tongue 10 passes through the floating window 11. The right sliding pin 12 is positioned on the right scissor arm 9 and slides in cooperation with the left guide groove 14. The left sliding pin 13 is positioned on the left scissor arm 8 and slides in cooperation with the right guide groove 15. The fixed electrode 16 is connected to the main rotating shaft 4, and the rotating electrode 17 is connected to the rotating sleeve 5. The coupling gap 18 is formed between the fixed electrode 16 and the rotating electrode 17. The feed radiation strip 19 is electrically connected to the fixed electrode 16 and the feed pad 21, and the coupling radiation strip 20 is electrically connected to the rotating electrode 17. The reference conductive strip 22 is spaced apart from the feed pad 21.

[0024] The right clamping plate 3 is fixedly connected to the rotating sleeve 5, and the left clamping plate 2 and the right clamping plate 3 are coaxially rotatably connected to the rotating sleeve 5 through the main rotating shaft 4. The left guide roller 6 is rotatably connected to the side of the left clamping plate 2 near the bending area, and the right guide roller 7 is rotatably connected to the side of the right clamping plate 3 near the bending area. The axes of the left guide roller 6 and the right guide roller 7 are both parallel to the axis of the main rotating shaft 4. The bending area of ​​the flexible substrate 1 is located within the guide gap formed between the left guide roller 6, the right guide roller 7, the left clamping plate 2, and the right clamping plate 3.

[0025] One end of the left scissor arm 8 is rotatably connected to the left clamping plate 2, and the other end of the left scissor arm 8 is provided with a left sliding pin 13, which extends into the right guide groove 15. One end of the right scissor arm 9 is rotatably connected to the right clamping plate 3, and the other end of the right scissor arm 9 is provided with a right sliding pin 12, which extends into the left guide groove 14. The cross guide tongue 10 is formed in the middle of the left scissor arm 8, and the floating window 11 is opened in the middle of the right scissor arm 9.

[0026] The floating window 11 has a movable margin along the relative sliding direction of the left scissor arm 8 and the right scissor arm 9. Both sides of the cross guide tongue 10 have lateral margins with the sidewalls of the floating window 11. The cross guide tongue 10 and the floating window 11 form a floating cross limiting fit.

[0027] In this invention, the left guide groove 14 has a left folding stop end and a left unfolding stop end, the right guide groove 15 has a right folding stop end and a right unfolding stop end, the right sliding pin 12 abuts against the left folding stop end of the left guide groove 14 in the folded position, and the left sliding pin 13 abuts against the right unfolding stop end of the right guide groove 15 in the unfolded position.

[0028] The fixed electrode 16 is sleeved on the axial end of the main rotating shaft 4 and is connected in a conductive manner to the feed radiation strip 19. The rotating electrode 17 is sleeved on the axial end of the rotating sleeve 5 and is connected in a conductive manner to the coupling radiation strip 20. The fixed electrode 16 and the rotating electrode 17 are arranged opposite each other along the axial direction of the main rotating shaft 4, and the coupling gap 18 is located between the fixed electrode 16 and the rotating electrode 17.

[0029] The feeding radiation strip 19 is arranged on the left side of the flexible substrate 1, and the coupling radiation strip 20 is arranged on the right side of the flexible substrate 1. There is no continuous conductive section crossing the bending area between the feeding radiation strip 19 and the coupling radiation strip 20. The feeding pad 21 is connected to the feeding radiation strip 19.

[0030] In this invention, the flexible substrate 1 can be connected to the left clamping plate 2 and the right clamping plate 3 respectively by pressing, bonding or fastening, so that the flexible substrate 1 remains attached in the left and right clamping areas and retains a flexible allowance in the bending area. The left clamping plate 2 and the right clamping plate 3 can be conventional rigid support members to provide a supporting base for the flexible substrate 1. The main rotating shaft 4 can be fixed to the left clamping plate 2 by plugging, riveting or end pressing. The rotating sleeve 5 can be fixed to the right clamping plate 3 by snap-fitting, welding or fasteners, so that the right clamping plate 3 can rotate relative to the main rotating shaft 4 with the rotating sleeve 5. An assembly gap can be reserved between the main rotating shaft 4 and the rotating sleeve 5, or conventional wear-resistant spacers can be set to reduce frictional resistance during rotation.

[0031] The left guide roller 6 and right guide roller 7 can be mounted on their respective clamping plates via roller shafts or end supports. The outer circumference of the rollers is used to form contact guidance with the bending area of ​​the flexible substrate 1. A gap can be maintained between the rollers and the clamping plates for the flexible substrate 1 to pass through. The size of this gap can be adjusted according to the thickness of the flexible substrate 1 and the allowable bending radius. With this arrangement, the flexible substrate 1 is less likely to be directly pressed against the edge of the clamping plate when folded, which helps to reduce local stress concentration in the bending area.

[0032] The left scissor arm 8 and right scissor arm 9 serve as auxiliary limiting components between the left and right clamping plates, respectively. The fixed connection end of the left scissor arm 8 can be rotatably engaged with the left clamping plate 2 via a conventional pin. The movable end of the left scissor arm 8 is connected to a left sliding pin 13, which extends into the right guide groove 15. The fixed connection end of the right scissor arm 9 can be rotatably engaged with the right clamping plate 3 via a conventional pin. The movable end of the right scissor arm 9 is connected to a right sliding pin 12, which extends into the left guide groove 14. The left guide groove 14 and right guide groove 15 can each be equipped with a stop end to limit the stroke range of the corresponding sliding pin, thereby restricting the unfolded and folded positions of the left and right clamping plates. A rotational clearance can be reserved between each pin and its corresponding connecting hole to ensure smooth scissor movement.

[0033] The cross guide tongue 10 can be integrally formed with the left scissor arm 8, or it can be fixed to the left scissor arm 8 via a connector. The floating window 11 is disposed on the right scissor arm 9 to accommodate the cross guide tongue 10. A longitudinal and lateral movement margin is maintained between the cross guide tongue 10 and the floating window 11, ensuring that the left scissor arm 8 and the right scissor arm 9 maintain cross constraint during relative movement without jamming due to assembly errors or local offsets. This floating fit helps to improve the problem of high dependence on assembly accuracy for simple articulated cross arms.

[0034] The fixed electrode 16 is electrically or fixedly connected to the main rotating shaft 4, and the rotating electrode 17 is electrically or fixedly connected to the rotating sleeve 5. The fixed electrode 16 and the rotating electrode 17 maintain a non-contact state and form a coupling region through a coupling gap 18. The width of the coupling gap 18 can be set according to the required coupling strength and machining accuracy. An insulating limiting component can be provided between the fixed electrode 16 and the rotating electrode 17 to reduce the possibility of direct contact between them during assembly.

[0035] Both the feed radiation strip 19 and the coupling radiation strip 20 can be fixed to the top surface of the flexible substrate 1 by copper plating, printing conductive layers, or attaching conductive sheets. The feed radiation strip 19 is electrically connected to the fixed electrode 16 and the feed pad 21, and the coupling radiation strip 20 is electrically connected to the rotating electrode 17. The reference conductive strip 22 is spaced apart from the feed pad 21 to form a reference terminal or ground reference structure. There is no continuous conductive segment crossing the bending area between the feed radiation strip 19 and the coupling radiation strip 20, so that the main conductive pattern avoids the repeatedly bending areas of the flexible substrate 1. It should be noted that the forming method of the conductive pattern, the pad connection method, and the insulation treatment method can all be completed using conventional processes in the field of flexible circuit boards. The specific thickness, line width, and connection process can be adjusted according to the actual operating frequency band and processing conditions.

[0036] The working principle of this invention is as follows: The operator applies external force to push the right clamping plate 3 to rotate relative to the left clamping plate 2 around the main rotating shaft 4. The right clamping plate 3 drives the rotating sleeve 5, which is fixedly connected to it, to rotate synchronously around the main rotating shaft 4, thereby forming a dynamic bending angle between the left clamping plate 2 and the right clamping plate 3. During this rotation, the left scissor arm 8 and the right scissor arm 9 swing crosswise with the relative movement of the two clamping plates: the right scissor arm 9 slides along the left guide groove 14 through the right sliding pin 12, and the left scissor arm 8 slides along the right guide groove 15 through the left sliding pin 13. At the intersection point, the two form a floating limit engagement with the floating window 11 through the cross guide tongue 10. The relative displacement of the cross guide tongue 10 within the floating window 11 provides adaptive mobility margin for the scissor arms, allowing the two scissor arms to smoothly change their cross angle during folding and unfolding. The side walls and end limits of the floating window 11 effectively constrain the swing amplitude of the scissor arms, preventing the clamping plate ends from tilting or exceeding the preset stroke. This ensures that the left clamping plate 2 and the right clamping plate 3 maintain a defined motion trajectory at any folding angle.

[0037] Meanwhile, the flexible substrate 1, laid on the left clamping plate 2 and the right clamping plate 3, undergoes bending deformation as the two clamping plates rotate relative to each other. Its bending area is precisely constrained within the guide gap formed between the left guide roller 6, the right guide roller 7, the left clamping plate 2, and the right clamping plate 3. During the folding process, the bending area of ​​the flexible substrate 1 forms a smooth arc transition by adhering to the outer periphery of the left guide roller 6 and the right guide roller 7, rather than bending directly against the rigid edge of the clamping plate. The left guide roller 6 and the right guide roller 7 rotate freely with the bending motion of the substrate, converting sliding friction into rolling friction, effectively reducing the risk of scratches on the surface of the flexible substrate 1. As the folding angle increases, the bending area of ​​the flexible substrate 1 gradually converges within the outer periphery of the left guide roller 6 and the right guide roller 7. The radius of curvature of the guide rollers directly limits the minimum bending radius of the bending area, ensuring that the flexible substrate 1 always operates within a safe bending curvature range, thereby significantly reducing the risk of fatigue damage caused by local stress concentration and repeated bending.

[0038] Throughout the folding or unfolding process, the fixed electrode 16 and the rotating electrode 17 rotate synchronously with the main shaft 4 and the rotating sleeve 5, respectively. They maintain a preset axial relative position and coupling gap 18, forming a stable electromagnetic coupling relationship unaffected by the folding angle. The feeding radiation strip 19 is arranged on the left side of the flexible substrate 1 and is electrically connected to the fixed electrode 16 and the feeding pad 21. The coupling radiation strip 20 is arranged on the right side of the flexible substrate 1 and is electrically connected to the rotating electrode 17. There is no continuous conductive section crossing the bending area between them; therefore, the main conductive radiation structure does not experience any tensile or compressive deformation during folding. The feeding radiation strip 19 and the coupling radiation strip 20 move as a whole with the left and right sides of the flexible substrate 1, maintaining their own geometry and relative coupling gap. The folding action only changes the spatial orientation of the radiation strips on both sides, without altering their electromagnetic boundary conditions. This minimizes the interference of the bending action on the radiation performance, ensuring that the radiator maintains consistent radiation characteristics in both unfolded and folded working postures.

[0039] In summary, this invention provides a scissor-type folding hinge structure and radiator based on a flexible polyimide substrate. Its core lies in the coaxial rotating pair formed by the main rotating shaft and the rotating sleeve, the linkage constraint mechanism consisting of the scissor arm and the sliding pin guide groove, and the adaptive limiting cooperation between the cross guide tongue and the floating window. This ensures that the left and right clamping plates always move along a defined trajectory during folding and unfolding, suppressing posture deviation and movement jamming. Simultaneously, guide rollers positioned on both sides of the bending area provide smooth arc transition support for the flexible substrate, precisely constraining the bending area within the guide gap, ensuring a controllable minimum bending radius, and reducing the risk of stress concentration and fatigue damage. In terms of electrical performance, the fixed electrode and the rotating electrode maintain a stable axial coupling gap. The feeding radiating strip and the coupling radiating strip are respectively arranged on both sides of the substrate and do not cross the bending area, ensuring that the main conductive structure completely avoids the deformation region. The folding action only changes the spatial orientation of the radiating strip without affecting its electromagnetic boundary conditions. In summary, this invention achieves high stability and high consistency of radiation performance during the folding process of the flexible substrate through the synergistic effect of motion guidance, bending protection, and radiation zoning.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A scissor-type folding hinge structure and radiator based on a flexible polyimide substrate, characterized in that, include: Flexible substrate (1); A left clamping plate (2) and a right clamping plate (3) are provided, with a bending area formed between the left clamping plate (2) and the right clamping plate (3), and the flexible substrate (1) is laid on the left clamping plate (2) and the right clamping plate (3); The main rotating shaft (4) and the rotating sleeve (5) are provided on the left clamping plate (2) and the rotating sleeve (5) is provided on the right clamping plate (3). The rotating sleeve (5) is sleeved on the outside of the main rotating shaft (4). A left guide roller (6) and a right guide roller (7), wherein the left guide roller (6) is disposed on the left clamping plate (2) and the right guide roller (7) is disposed on the right clamping plate (3); The left scissor arm (8) and the right scissor arm (9) are arranged crosswise; A cross guide tongue (10) and a floating window (11) are provided, wherein the cross guide tongue (10) is provided on the left scissor arm (8), and the floating window (11) is opened on the right scissor arm (9), and the cross guide tongue (10) passes through the floating window (11); Right sliding pin (12), left sliding pin (13), left guide groove (14) and right guide groove (15), the right sliding pin (12) is disposed on the right scissor arm (9) and the left sliding pin (13) is disposed on the left scissor arm (8); A fixed electrode (16) and a rotating electrode (17) are provided, wherein the fixed electrode (16) is connected to the main rotating shaft (4) and the rotating electrode (17) is connected to the rotating sleeve (5); The device includes a feed radiation strip (19), a coupling radiation strip (20), a feed pad (21), and a reference conductive strip (22). The feed radiation strip (19) is electrically connected to the fixed electrode (16) and the feed pad (21), and the coupling radiation strip (20) is electrically connected to the rotating electrode (17).

2. The scissor folding hinge structure based on a flexible polyimide substrate and radiator according to claim 1, characterized in that, The main rotating shaft (4) is fixedly mounted on the left clamping plate (2), and the rotating sleeve (5) is fixedly connected to the right clamping plate (3). The left clamping plate (2) and the right clamping plate (3) are coaxially rotated together by the main rotating shaft (4) and the rotating sleeve (5).

3. The scissor folding hinge structure based on a flexible polyimide substrate and radiator according to claim 1, characterized in that, The left guide roller (6) is disposed on the side of the left clamping plate (2) near the bending area, and the right guide roller (7) is disposed on the side of the right clamping plate (3) near the bending area; the left guide roller (6) is rotatably connected to the left clamping plate (2), and the right guide roller (7) is rotatably connected to the right clamping plate (3); the axis of the left guide roller (6) and the axis of the right guide roller (7) are both parallel to the axis of the main rotating shaft (4).

4. The scissor folding hinge structure based on a flexible polyimide substrate and radiator according to claim 3, characterized in that, The bending area of ​​the flexible substrate (1) is located within the guide gap formed between the left guide roller (6), the right guide roller (7), the left clamping plate (2), and the right clamping plate (3).

5. The scissor folding hinge structure based on a flexible polyimide substrate and radiator according to claim 1, characterized by, One end of the left scissor arm (8) is rotatably connected to the left clamping plate (2), and the other end of the left scissor arm (8) is provided with the left sliding pin (13), which extends into the right guide groove (15); one end of the right scissor arm (9) is rotatably connected to the right clamping plate (3), and the other end of the right scissor arm (9) is provided with the right sliding pin (12), which extends into the left guide groove (14); the cross guide tongue (10) is formed in the middle of the left scissor arm (8), and the floating window (11) is opened in the middle of the right scissor arm (9).

6. The scissor folding hinge structure based on a flexible polyimide substrate and radiator according to claim 5, characterized in that, The floating window (11) has a movable margin along the relative sliding direction of the left scissor arm (8) and the right scissor arm (9). Both sides of the cross guide tongue (10) have lateral margins with the sidewalls of the floating window (11). The cross guide tongue (10) and the floating window (11) form a floating cross limiting fit.

7. The scissor folding hinge structure based on a flexible polyimide substrate and radiator according to claim 5, characterized by, The left guide groove (14) has a left folding stop end and a left unfolding stop end, the right guide groove (15) has a right folding stop end and a right unfolding stop end, the right sliding pin (12) abuts against the left folding stop end of the left guide groove (14) in the folded position, and the left sliding pin (13) abuts against the right unfolding stop end of the right guide groove (15) in the unfolded position.

8. The scissor folding hinge structure based on a flexible polyimide substrate and radiator according to claim 1, characterized by, A coupling gap (18) is formed between the fixed electrode (16) and the rotating electrode (17). The fixed electrode (16) is sleeved on the axial end of the main rotating shaft (4) and is connected to the feed radiation strip (19). The rotating electrode (17) is sleeved on the axial end of the rotating sleeve (5) and is connected to the coupling radiation strip (20). The fixed electrode (16) and the rotating electrode (17) are arranged opposite to each other along the axial direction of the main rotating shaft (4). The coupling gap (18) is located between the fixed electrode (16) and the rotating electrode (17).

9. The scissor-type folding hinge structure and radiator based on a flexible polyimide substrate according to claim 1, characterized in that, The feeding radiation strip (19) is arranged on the left side of the flexible substrate (1), and the coupling radiation strip (20) is arranged on the right side of the flexible substrate (1). There is no continuous conductive section between the feeding radiation strip (19) and the coupling radiation strip (20) that crosses the bending area. The feeding pad (21) is connected to the feeding radiation strip (19). The reference conductive strip (22) is laid on the flexible substrate (1). The reference conductive strip (22) is electrically connected to the left clamping plate (2) and the right clamping plate (3) respectively. The reference conductive strip (22) is insulated from the feeding radiation strip (19) and the coupling radiation strip (20) and is arranged at intervals. The reference conductive strip (22) is continuously floating in the bending area.

10. The scissor folding hinge structure based on a flexible polyimide substrate and radiator according to claim 1, characterized in that, The left scissor arm (8) and the right scissor arm (9) are symmetrically arranged on both sides of the bending area, and the left scissor arm (8) and the right scissor arm (9) are respectively located on the same side or opposite side of the thickness direction of the flexible substrate (1); the left clamping plate (2) and the right clamping plate (3) are arranged coplanarly in the unfolded state and are relatively close together in the folded state; the left guide roller (6) and the right guide roller (7) constrain the bending trajectory of the flexible substrate (1) from both sides in the folded state, so that the bending area of ​​the flexible substrate (1) is kept within the outer periphery of the left guide roller (6) and the right guide roller (7).

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