Flexible circuit board constant speed roll-to-roll double-sided simultaneous laser direct writing exposure machine

Abstract

The present application relates to the technical field of flexible circuit board production, in particular to a constant-speed roll-to-roll double-sided simultaneous laser direct writing exposure machine for flexible circuit board, which breaks the traditional step-by-step exposure mode, and improves the efficiency by 5 times, and is a latest replacement product, comprising a double-sided exposure system, a roll material conveying system, a tension adjusting system and a tension feedback unit, a closed loop feedback is constructed by setting a tension sensor in an exposure area, and the technical problem of dynamically constant tension under constant speed is solved; meanwhile, the compression roller is designed as an axial partition pressure adjustable structure, independent control of the material width direction pressure is realized, the edge warping is effectively inhibited, and different material process requirements are adaptively matched.

Description

Technical Field

[0001] This invention relates to the field of flexible circuit board manufacturing technology, specifically to a constant-speed roll-to-roll double-sided simultaneous laser direct-write exposure machine for flexible circuit boards. Background Technology

[0002] Roll-to-roll laser direct writing exposure technology is a key process in the field of flexible circuit board manufacturing. It forms circuit patterns by directly scanning the surface of a flexible substrate coated with photosensitive material using a laser beam. Compared with traditional mask exposure methods, it has significant advantages such as simplified process, shorter cycle and reduced cost.

[0003] Currently, most mainstream equipment on the market adopts an intermittent step-exposure working mode: the flexible circuit board moves to the predetermined exposure position and then stops, during which the exposure mechanism completes the scanning of the current area of ​​the pattern. After the exposure is completed, the material is restarted and transported to the next station, and this cycle is repeated. This mode has inherent limitations: first, the alternating start and stop results in limited equipment production efficiency, making it difficult to meet the needs of large-scale continuous production; second, the material is prone to micro-positional shifts and vibrations during frequent start and stop processes, directly affecting the pattern overlay accuracy and linewidth consistency; third, the intermittent transport method makes it impossible to maintain a dynamic constant tension state in the exposure area during the exposure process, and it is difficult to compensate for the slight expansion and contraction deformation of the flexible substrate in real time, which restricts the breakthrough of higher precision pattern processing capabilities.

[0004] Therefore, how to construct a roll-to-roll laser direct-write exposure system that can achieve constant speed transport, double-sided synchronous exposure, and has high-precision tension closed-loop control and adaptive pressure adjustment capabilities has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the problems existing in the prior art, a constant-speed roll-to-roll double-sided simultaneous laser direct writing exposure machine for flexible circuit boards is provided. By setting up a double-sided exposure system and a roll material conveying system to work together, the double-sided exposure system performs synchronous laser direct writing operations as the flexible circuit board continuously and horizontally passes through the exposure area between the upper and lower exposure matrices at a constant speed. This achieves uninterrupted conveying and continuous exposure throughout the entire process from unwinding to rewinding, fundamentally solving the exposure error problem caused by material start-stop.

[0006] To address the problems of existing technologies, this invention provides a constant-speed roll-to-roll double-sided simultaneous laser direct-write exposure machine for flexible circuit boards, comprising: a double-sided exposure system having an upper exposure matrix and a lower exposure matrix arranged opposite to each other, used to perform synchronous laser direct-write operations on the upper and lower surfaces of the flexible circuit board passing between them during continuous uniform-speed conveying of the flexible circuit board; a roll material conveying system including an unwinding roller group and a rewinding roller group disposed on both sides of the double-sided exposure system, used to drive the flexible circuit board to continuously and horizontally pass through the exposure area between the upper and lower exposure matrices at a constant speed, realizing uninterrupted conveying from unwinding to rewinding; and a constant-speed synchronous control system including a high-precision grating ruler and a computer control unit disposed in the double-sided exposure system, wherein the grating ruler is used to collect the conveying position information of the flexible circuit board in real time and feed it back to the computer control unit, and the computer control unit controls the movement of the double-sided exposure system and the roll material conveying system to synchronize according to the feedback information, so that the laser direct-write output and the constant-speed material conveying are matched in real time.

[0007] Preferably, the system further includes: a tension adjustment system disposed inside the double-sided exposure system, comprising a first tension roller group and a second tension roller group arranged sequentially along the travel direction of the flexible circuit board; the first tension roller group includes a first pressure roller and a first drive roller arranged in parallel, and the second tension roller group includes a second pressure roller and a second drive roller arranged in parallel; the tension adjustment system further includes a first servo motor drivenly connected to the first drive roller, and a second servo motor drivenly connected to the second drive roller, wherein the first pressure roller and the second pressure roller are both adjustable pressure rollers with adjustable axial partition pressure, each including a central shaft and pressure adjustment units distributed axially along the central shaft; and a tension feedback unit, comprising a tension sensor disposed in the exposure area between the first tension roller group and the second tension roller group, for real-time detection of the actual tension value of the flexible circuit board in this area and feedback to the computer control unit, wherein the computer control unit dynamically adjusts the speed difference between the first servo motor and the second servo motor, as well as the partition pressure of the first pressure roller and the second pressure roller, based on the tension feedback information, so that the tension in the exposure area remains dynamically constant under constant speed conveying conditions.

[0008] Preferably, the tension adjustment system further includes a frame and a pair of shock-absorbing rollers disposed in the frame, the tension adjustment system being disposed in the frame and located between the two shock-absorbing rollers.

[0009] Preferably, the frame is provided with a mounting groove extending in a vertical direction, the end shafts of the first pressure roller and the second pressure roller are slidably disposed in the mounting groove in a vertical direction, and a pressure adjusting component for adjusting the overall downward pressure of the first pressure roller and the second pressure roller is provided in the mounting groove.

[0010] Preferably, the pressure regulating assembly includes: a sliding block, which is slidably disposed in the mounting groove in a vertical direction; an elastic element, which is disposed between the bottom end of the mounting groove and the sliding block; and a threaded rod, which passes through the frame in a vertical direction and is threadedly connected thereto, with the bottom end of the threaded rod abutting against the top end of the sliding block.

[0011] Preferably, the central shaft is hollow and has air holes distributed along its axial direction, and the pressure regulating unit includes circular air bladders distributed along the axial direction of the central shaft outside the central shaft, the circular air bladders communicating with the corresponding air holes.

[0012] Preferably, positioning rings are provided at both ends of the central shaft, and the pressure regulating unit includes a rubber sleeve coaxially disposed outside the central shaft. The inner circumference of the rubber sleeve is provided with rubber rings distributed along its axial direction. The inner circumference of the rubber rings is sealed to the outer circumferential surface of the central shaft, and adjacent rubber rings form a circular air bladder communicating with the air hole.

[0013] Preferably, the central shaft is provided with three air holes, and two pistons are provided on the inner circumference of the central shaft. The pistons are located between adjacent air holes, and a drive rod is provided at the opposite end of each of the two pistons. A linear push module is also provided on the frame, and the output rod of the linear push module is coaxially rotatably connected to the drive rod.

[0014] Preferably, two clamping rings are provided on the circumferential surface of the central shaft, and the rubber ring extends radially between the two clamping rings.

[0015] Preferably, the frame is further provided with a sliding groove extending in a vertical direction, a mounting block is provided in the sliding groove, an elastic buffer element is provided between the mounting block and the bottom end of the sliding groove, and the end shaft of the shock-absorbing buffer roller passes through the mounting block and is rotatably connected to it.

[0016] The advantages of this application compared to the prior art are: This application achieves synchronous laser direct writing by coordinating a double-sided exposure system and a roll material conveying system, while the flexible circuit board continuously travels horizontally through the exposure area at a constant speed. This enables uninterrupted conveying and continuous exposure throughout the entire process from unwinding to rewinding, fundamentally eliminating the microscopic positional shifts and vibrations caused by frequent material starts and stops in the traditional intermittent step exposure mode. It avoids the resulting problems of pattern overlay errors and reduced linewidth consistency, significantly improving exposure accuracy and product yield.

[0017] Meanwhile, the constant speed synchronous control system collects material conveying position information in real time through a high-precision grating ruler and feeds it back to the computer control unit with micron-level accuracy. Based on this, the computer control unit precisely controls the movement synchronization of the double-sided exposure system and the roll material conveying system, so that the laser direct writing output and the constant speed material conveying are matched in real time. This ensures that the pattern exposure position and the actual material position are highly consistent under continuous operation, further guaranteeing the positional accuracy and repeatability of the exposed pattern. Attached Figure Description

[0018] Figure 1 This is a perspective view of the flexible circuit board constant speed roll-to-roll double-sided simultaneous laser direct writing exposure machine of the present invention.

[0019] Figure 2 This is a three-dimensional sectional view of the flexible circuit board constant speed roll-to-roll double-sided simultaneous laser direct writing exposure machine of the present invention.

[0020] Figure 3 This is a cross-sectional view of the flexible circuit board constant speed roll-to-roll double-sided simultaneous laser direct writing exposure machine of the present invention.

[0021] Figure 4 This is a perspective view of the tension adjustment system in the flexible circuit board constant speed roll-to-roll double-sided simultaneous laser direct writing exposure machine of the present invention.

[0022] Figure 5 This is a cross-sectional view of the tension adjustment system in the flexible circuit board constant speed roll-to-roll double-sided simultaneous laser direct writing exposure machine of the present invention.

[0023] Figure 6 yes Figure 5 A magnified view of part A.

[0024] Figure 7 yes Figure 5 A magnified view of section B.

[0025] Figure 8 This is a partial exploded perspective view of the tension adjustment system in the constant speed roll-to-roll double-sided simultaneous laser direct writing exposure machine for flexible circuit boards according to the present invention.

[0026] Figure 9 yes Figure 8 A magnified view of a portion of point C.

[0027] Figure 10 yes Figure 8 A magnified view of a portion of point D.

[0028] The diagram is labeled as follows: 11. Upper exposure matrix; 12. Lower exposure matrix; 21. Unwinding roller assembly; 22. Rewinding roller assembly; 311. First pressure roller; 3111. Central shaft; 3112. Air hole; 3113. Positioning ring; 3114. Piston; 3115. Drive rod; 3116. Linear drive module; 3117. Clamping ring; 3121. Pressure adjustment unit; 3122. Circular airbag; 3123. Rubber sleeve; 3124. Rubber ring; 313. First drive roller; 314. First servo motor; 321. Second pressure roller; 322. Second drive roller; 323. Second servo motor; 33. Frame; 331. Mounting block; 332. Elastic buffer element; 333. End plate; 334. Connecting column; 34. Shock-absorbing buffer roller; 351. Sliding block; 352. Elastic element; 353. Threaded rod. Detailed Implementation

[0029] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figures 1 to 5As shown, a constant-speed roll-to-roll double-sided simultaneous laser direct-writing exposure machine for flexible circuit boards includes: a double-sided exposure system having an upper exposure matrix 11 and a lower exposure matrix 12 arranged opposite to each other for synchronously laser direct-writing the upper and lower surfaces of the flexible circuit board passing between them; a roll material conveying system including an unwinding roller group 21 and a rewinding roller group 22 disposed on both sides of the double-sided exposure system for driving the flexible circuit board horizontally through the exposure area between the upper exposure matrix 11 and the lower exposure matrix 12 at a constant speed; and a constant-speed synchronous control system including a high-precision grating ruler and a computer control unit, wherein the grating ruler is disposed on... Between the upper exposure matrix 11 and the lower exposure matrix 12, the grating ruler is used to collect the flexible circuit board conveying position information in real time and feed it back to the computer control unit with an accuracy of 0.1μm. The computer control unit controls the movement of the double-sided exposure system and the roll material conveying system to synchronize according to the feedback information, so that the laser direct writing output and the constant speed material conveying are matched in real time, eliminating the exposure error caused by the start and stop of the material; the tension adjustment system is set inside the double-sided exposure system, including a first tension roller group and a second tension roller group arranged sequentially along the travel direction of the flexible circuit board; the first tension roller group includes a flat The first pressure roller 311 and the first drive roller 313 are arranged in parallel. The second tension roller group includes a second pressure roller 321 and a second drive roller 322 arranged in parallel. The tension adjustment system also includes a first servo motor 314 driven by the first drive roller 313 and a second servo motor 323 driven by the second drive roller 322. The first pressure roller 311 and the second pressure roller 321 are both adjustable pressure rollers with adjustable axial partition pressure. They include a central shaft 3111 and pressure adjustment units 3121 distributed axially along the central shaft 3111. A tension feedback unit is also included. The system includes a tension sensor disposed within the exposure area between the first tension roller group and the second tension roller group. This tension sensor is used to detect the actual tension value of the flexible circuit board in this area in real time and feed it back to the computer control unit. The computer control unit dynamically adjusts the speed difference between the first servo motor 314 and the second servo motor 323, as well as the partition pressure between the first pressure roller 311 and the second pressure roller 321, based on the tension feedback information, so that the tension in the exposure area remains dynamically constant under constant speed conveying conditions.

[0031] The flexible circuit board constant speed roll-to-roll double-sided simultaneous laser direct writing exposure machine addresses the problems of low efficiency, start-stop error, and difficulty in suppressing tension fluctuations under constant speed conveying conditions caused by intermittent step exposure mode, as well as the inability of traditional pressure rollers to achieve adaptive adjustment of pressure distribution. It provides a high-precision exposure device that can complete double-sided synchronous laser direct writing during the continuous uniform speed movement of materials.

[0032] The equipment includes a double-sided exposure system with an upper exposure matrix 11 and a lower exposure matrix 12 arranged opposite to each other. The two working ends are set opposite to each other to perform synchronous laser direct writing on the upper and lower surfaces of a flexible circuit board that travels horizontally through the exposure area between them, eliminating the overlay error caused by traditional multi-stage exposure.

[0033] The equipment includes a roll conveying system, which consists of an unwinding roller group 21 and a rewinding roller group 22 located on both sides of the double-sided exposure system. It is used to drive the flexible circuit board to pass smoothly through the exposure area at a constant speed, realizing continuous and uninterrupted conveying throughout the entire process from unwinding to rewinding, fundamentally overcoming the limitations of stepper start-stop on production efficiency and graphic accuracy.

[0034] The device includes a tension adjustment system located within the double-sided exposure system and along the exposure area. Specifically, it comprises a first tension roller group and a second tension roller group arranged sequentially along the travel direction of the flexible circuit board. The first tension roller group includes a first pressure roller 311 and a first drive roller 313 arranged in parallel, and the second tension roller group includes a second pressure roller 321 and a second drive roller 322 arranged in parallel. The tension adjustment system is also equipped with a first servo motor 314 driven by the first drive roller 313 and a second servo motor 323 driven by the second drive roller 322. Through independent driving, precise control of the linear speed of the two drive rollers is achieved, thereby establishing the basic tension of the exposure section.

[0035] Both the first pressure roller 311 and the second pressure roller 321 are adjustable pressure rollers with independently adjustable axial zone pressure. Their structure includes a central shaft 3111 and several pressure adjustment units 3121 arranged sequentially along the central shaft 3111 and controlled independently. This design allows the pressure rollers to apply differentiated pressing force to different areas along the width of the flexible circuit board. It can apply localized enhanced pressure to areas prone to warping at the material edges to achieve dynamic flattening, and can also adaptively adjust the pressure distribution according to differences in material thickness, hardness, and width to ensure close contact between the material and the surface of the drive roller and uniform friction throughout the entire width.

[0036] The equipment also includes a tension feedback unit, the core of which is a tension sensor located in the exposure area between the first and second tension roller groups. This sensor is used to detect the actual tension value of the flexible circuit board in this area in real time and directly, and transmit the detection signal to the control system. Together with the servo motor speed adjustment, zone pressure setting and other execution links, it forms a fully closed-loop precision control circuit.

[0037] During operation, the flexible circuit board is led out from the self-unwinding roller group 21 and passes sequentially through the first tension roller group, the exposure area, and the second tension roller group at a constant speed, finally being wound up onto the take-up roller group 22. Tension sensors continuously collect real-time tension data of the exposure area, and the control system dynamically fine-tunes the speed difference between the first drive roller 313 and the second drive roller 322 accordingly, ensuring that the tension in the exposure area remains stable within the target process window. Simultaneously, the pressure adjustment units 3121 of the first pressure roller 311 and the second pressure roller 321 independently apply axial zoned pressure according to material characteristics and operating conditions, ensuring that the material does not slip, edge warping, or experience localized overpressure on the drive roller surface, providing a stable, flat, and tension-constant processing plane for the double-sided exposure system. The upper exposure matrix 11 and the lower exposure matrix 12 continuously perform synchronous laser direct writing on this plane, completing the graphic processing.

[0038] like Figure 3 , Figure 8 and Figure 9 As shown, the tension adjustment system also includes a frame 33 and a pair of shock-absorbing rollers 34 disposed in the frame 33. The tension adjustment system is disposed in the frame 33 and is located between the two shock-absorbing rollers 34.

[0039] The tension adjustment system is equipped with a dedicated frame 33, on which a pair of shock-absorbing buffer rollers 34 are arranged sequentially along the direction of travel of the flexible circuit board, located at the inlet and outlet sides of the tension adjustment system, respectively. The entire tension adjustment system is set between the pair of shock-absorbing buffer rollers 34, so that the flow of flexible circuit boards entering the tensioning area first passes through the mechanical filtering and disturbance isolation of the shock-absorbing buffer rollers 34, and at the same time, the flow of flexible circuit boards after tension adjustment is smoothly conveyed to the take-up roller group 22 through the shock-absorbing buffer rollers 34 on the outlet side.

[0040] like Figure 10 As shown, the frame 33 is provided with a mounting groove extending in the vertical direction. The end shafts of the first pressure roller 311 and the second pressure roller 321 are slidably disposed in the mounting groove in the vertical direction. The mounting groove is provided with a pressure adjusting component for adjusting the overall downward pressure of the first pressure roller 311 and the second pressure roller 321.

[0041] The frame 33 has mounting slots along the vertical direction. The end shafts of the first pressure roller 311 and the second pressure roller 321 are slidably housed in their respective mounting slots and can reciprocate vertically. Each mounting slot is equipped with a pressure regulating component, which abuts against the end shaft of the corresponding pressure roller and applies an adjustable overall vertical downward pressure to the first pressure roller 311 and the second pressure roller 321. This overall vertical downward pressure works in conjunction with the independently adjustable pressure regulating unit 3121 for axial zone pressure: the pressure regulating component achieves coarse adjustment and basic setting of the overall contact pressure of the pressure roller on the drive roller, while the several pressure regulating units 3121 distributed axially along the central axis 3111 achieve fine zone control of the pressing force in different areas along the width of the flexible circuit board. Together, they form a hierarchical pressure control architecture that combines coarse and fine pressure, ensuring stable clamping of the material by the pressure roller as a whole while also taking into account the adaptive matching of the pressure distribution within the width.

[0042] like Figure 10 As shown, the pressure regulating assembly includes: a sliding block 351, which is slidably disposed in the mounting groove in the vertical direction; an elastic element 352, which is disposed between the bottom end of the mounting groove and the sliding block 351; and a threaded rod 353, which passes through the frame 33 in the vertical direction and is threadedly connected to it, with the bottom end of the threaded rod 353 abutting against the top end of the sliding block 351.

[0043] The sliding block 351 is slidably accommodated in the mounting groove in the vertical direction and abuts against the end shaft of the first pressure roller 311 or the second pressure roller 321; the elastic element 352 is disposed between the bottom end of the mounting groove and the sliding block 351, and is used to provide the sliding block 351 with a continuous upward elastic preload.

[0044] The threaded rod 353 passes vertically through the frame 33 and is threadedly connected to the frame 33, with its bottom end abutting against the top of the sliding block 351. By rotating the threaded rod 353, the sliding block 351 can be driven to slide vertically downward along the mounting groove, thereby compressing the elastic element 352 and realizing stepless adjustment of the overall vertical downward pressure of the first pressure roller 311 and the second pressure roller 321. This overall vertical downward pressure works in conjunction with the pressure adjustment unit 3121, which can independently adjust the axial zone pressure, to jointly form a hierarchical and combined coarse and fine pressure control architecture.

[0045] like Figure 5 , Figure 6 and Figure 7As shown, the central shaft 3111 is hollow and has air holes 3112 distributed along its axial direction. The pressure regulating unit 3121 includes circular air bags 3122 distributed along the axial direction of the central shaft 3111 outside the central shaft 3111. The circular air bags 3122 are connected to the corresponding air holes 3112.

[0046] The central shaft 3111 is a hollow structure, with an axially penetrating air intake channel inside, and a number of air holes 3112 connected to the air intake channel are distributed along the axial direction of the central shaft 3111.

[0047] The pressure regulating unit 3121 includes a plurality of circular airbags 3122 arranged sequentially and independently along the axial direction of the central shaft 3111. Each circular airbag 3122 is sleeved on the outside of the central shaft 3111 and is sealed and connected to the corresponding air hole 3112.

[0048] An external air source supplies air independently to each circular airbag 3122 through the air inlet channel and air hole 3112, enabling each circular airbag 3122 to expand or contract independently along the axial direction, thereby applying an independently adjustable radial pressure to the corresponding area in the width direction of the flexible circuit board. This axial partition pressure adjustment structure works in conjunction with the overall vertical downward pressure provided by the pressure adjustment component. The former achieves fine partition control of the pressure distribution within the width, while the latter achieves the basic setting of the global contact pressure of the pressure roller on the drive roller. Together, they form a hierarchical and coarse-fine pressure control architecture, which not only ensures the stable clamping of the material by the pressure roller as a whole, but also takes into account the suppression of edge warping and the adaptive matching of pressure uniformity within the width.

[0049] like Figure 7 As shown, positioning rings 3113 are provided at both ends of the central shaft 3111. The pressure regulating unit 3121 includes a rubber sleeve 3123 coaxially disposed outside the central shaft 3111. Rubber rings 3124 distributed along its axial direction are provided on the inner circumference of the rubber sleeve 3123. The inner circumference of the rubber rings 3124 is sealed to the outer circumferential surface of the central shaft 3111. Adjacent rubber rings 3124 form a circular air bladder 3122 communicating with the air hole 3112.

[0050] Positioning rings 3113 are provided at both ends of the central shaft 3111 for axially limiting the rubber sleeve 3123 sleeved outside the central shaft 3111. The pressure regulating unit 3121 includes a rubber sleeve 3123 coaxially sleeved outside the central shaft 3111. Several rubber rings 3124 are spaced apart along the axial direction on the inner circumference of the rubber sleeve 3123. The inner circumference of each rubber ring 3124 is sealed and fitted to the outer circumferential surface of the central shaft 3111. The adjacent rubber rings 3124 and the outer wall of the central shaft 3111 together form several circular air bladders 3122 arranged sequentially along the axial direction, independent of each other, and connected to the corresponding air holes 3112. An external air source independently inflates and deflates each circular airbag 3122 through the internal air intake channel of the central shaft 3111 and each air hole 3112, so that each airbag can expand or contract independently along the axial direction, thereby driving the outer wall of the rubber sleeve 3123 to produce radially differentiated deformation, thereby realizing independent adjustment of the pressing force of the corresponding area in the width direction of the flexible circuit board.

[0051] like Figure 5 and Figure 6 As shown, the central shaft 3111 is provided with three air holes 3112, and two pistons 3114 are provided on the inner circumference of the central shaft 3111. The pistons 3114 are located between adjacent air holes 3112. Each of the two pistons 3114 has a drive rod 3115 at one end opposite to the other. The frame 33 is also provided with a linear push module 3116. The output rod of the linear push module 3116 is coaxially rotatably connected to the drive rod 3115.

[0052] The central shaft 3111 has three vent holes 3112 spaced apart along the axial direction. Pistons 3114 are respectively arranged on the inner circumference of the central shaft 3111 between adjacent vent holes 3112, and each piston 3114 is in a sealing sliding fit with the inner wall of the central shaft 3111. A drive rod 3115 is provided on the opposite end of each piston 3114 along the axial direction. The drive rod 3115 passes through the end of the central shaft 3111 and extends to the outside.

[0053] The frame 33 is also equipped with a linear drive module 3116. The output rod of the linear drive module 3116 is coaxially rotatably connected to the corresponding drive rod 3115, which is used to drive the piston 3114 to reciprocate linearly along the central axis 3111. Through the axial displacement of the piston 3114, the volume and initial pressure reference of the circular air bladder 3122 corresponding to the adjacent air hole 3112 can be dynamically adjusted, thereby realizing the overall offset and fine-tuning of the pressing force range of each axial zone. This structure works in conjunction with the circular air bladder 3122 and the pressure adjustment component: the circular air bladder 3122 realizes independent control of the pressing force of each zone within the width, the displacement of the piston 3114 realizes synchronous adjustment of the pressure baseline of each zone, and the pressure adjustment component realizes the global setting of the overall vertical downward pressure of the pressure roller. The three together constitute a multi-level, multi-dimensional pressure control architecture.

[0054] like Figure 7 As shown, two clamping rings 3117 are provided on the circumferential surface of the central shaft 3111, and the rubber ring 3124 extends radially between the two clamping rings 3117.

[0055] Two clamping rings 3117 are axially spaced on the circumferential surface of the central shaft 3111, each extending outward from the outer circumference of the central shaft 3111. The inner circumference of the rubber ring 3124 extends radially inward and is tightly fitted into the annular groove formed between two adjacent clamping rings 3117. The clamping rings 3117 provide axial limiting and radial support for the rubber ring 3124, ensuring a stable and sealed connection between the inner circumference of the rubber ring 3124 and the outer circumferential surface of the central shaft 3111. This structure effectively prevents the rubber ring 3124 from axially slipping or curling under air pressure when the circular airbags 3122 are inflated, ensuring the morphological stability and pressure response consistency of each circular airbag 3122 during independent inflation, thereby improving the repeatability and control reliability of axial zone pressure regulation.

[0056] like Figure 9 As shown, the frame 33 is also provided with a sliding groove extending in the vertical direction. A mounting block 331 is provided in the sliding groove. An elastic buffer element 332 is provided between the mounting block 331 and the bottom end of the sliding groove. The end shaft of the shock-absorbing buffer roller 34 passes through the mounting block 331 and is rotatably connected to it.

[0057] The shock-absorbing roller 34 is floatingly mounted to the frame 33 via the aforementioned structure. The shock-absorbing roller 34 is located at the inlet and outlet sides of the tension adjustment system, serving as the first and second shock-absorbing rollers, respectively. The flexible circuit board extending from the unwinding roller group 21 passes through the first shock-absorbing roller 34 and enters the first tensioning roller group. The flexible circuit board extending from the second tensioning roller group passes through the second shock-absorbing roller 34 and is then wound into the take-up roller group 22.

[0058] The elastic buffer element 332 absorbs material vibration, roll diameter changes, and joint impacts from the unwinding side, preventing them from entering the precision tension control area formed by the first and second tension roller groups. Simultaneously, it isolates speed fluctuations and inertial disturbances from the winding side, avoiding reverse interference with the tension stability of the exposure area. The material flow purified by the shock-absorbing buffer roller 34 enters the exposure area in a stable state, providing a highly pure tension environment for the simultaneous laser direct writing of the double-sided exposure system.

[0059] like Figure 8 As shown, the frame 33 includes two end plates 333 and a connecting column 334 connecting the two end plates 333. The first tensioning roller group, the second tensioning roller group and the shock-absorbing buffer roller 34 are all arranged between the two end plates 333.

[0060] The first drive roller 313 and the second drive roller 322 have their ends passing through corresponding end plates 333 and extending outward to be connected to the first servo motor 314 and the second servo motor 323 for transmission. The end shafts of the first pressure roller 311 and the second pressure roller 321 are respectively housed in mounting grooves extending vertically on the end plates 333, and the pressure regulating components are disposed in the mounting grooves.

[0061] The end shaft of the shock-absorbing buffer roller 34 is housed in a vertically extending sliding groove on the end plate 333, and forms a floating support with the elastic buffer element 332 through the mounting block 331. This frame structure 33 integrates the functional units of the tension adjustment system within the same rigid reference frame, ensuring the relative positional accuracy and motion synchronization between the roller groups. Furthermore, the mounting groove and sliding groove on the end plate 333 enable functional zoning of the overall pressure adjustment of the pressure roller and the floating isolation of the shock-absorbing buffer roller 34, providing a stable and clean mechanical support platform for the exposure area.

[0062] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A flexible circuit board constant speed roll-to-roll double-sided simultaneous laser direct writing exposure machine, characterized in that, include: A double-sided exposure system, which has an upper exposure matrix and a lower exposure matrix arranged opposite to each other, is used to perform synchronous laser direct writing on the upper and lower surfaces of the flexible circuit board during the continuous uniform speed conveying process of the flexible circuit board. The roll material conveying system includes an unwinding roller group and a take-up roller group disposed on both sides of the double-sided exposure system, which are used to drive the flexible circuit board to continuously and horizontally pass through the exposure area between the upper exposure matrix and the lower exposure matrix at a constant speed, so as to realize uninterrupted conveying throughout the entire process from unwinding to take-up. A constant-speed synchronous control system includes a high-precision grating ruler and a computer control unit installed in the double-sided exposure system. The grating ruler is used to collect the position information of the flexible circuit board in real time and feed it back to the computer control unit. The computer control unit controls the movement synchronization of the double-sided exposure system and the roll material conveying system according to the feedback information, so that the laser direct writing output and the constant-speed material conveying are matched in real time; it also includes: The tension adjustment system is located inside the double-sided exposure system and includes a first tension roller group and a second tension roller group arranged sequentially along the travel direction of the flexible circuit board. The first tensioning roller group includes a first pressure roller and a first drive roller arranged in parallel, and the second tensioning roller group includes a second pressure roller and a second drive roller arranged in parallel. The tension adjustment system further includes a first servo motor that is driven and connected to the first drive roller, and a second servo motor that is driven and connected to the second drive roller. Both the first pressure roller and the second pressure roller are adjustable pressure rollers with adjustable axial partition pressure, each including a central shaft and pressure adjustment units distributed axially along the central shaft. The tension feedback unit includes a tension sensor disposed in the exposure area between the first tension roller group and the second tension roller group, which is used to detect the actual tension value of the flexible circuit board in the area in real time and feed it back to the computer control unit. The computer control unit dynamically adjusts the speed difference between the first servo motor and the second servo motor, as well as the partition pressure of the first pressure roller and the second pressure roller, according to the tension feedback information, so that the tension in the exposure area remains dynamically constant under constant speed conveying conditions. The tension adjustment system also includes a frame and a pair of shock-absorbing rollers disposed in the frame. The tension adjustment system is disposed in the frame and is located between the two shock-absorbing rollers. The central shaft is hollow and has air holes distributed along its axial direction. The pressure regulating unit includes circular air bladders distributed outside the central shaft along the axial direction of the central shaft. The circular air bladders are connected to the corresponding air holes. The central shaft has three air holes, and two pistons are arranged on the inner circumference of the central shaft. The pistons are located between adjacent air holes, and a drive rod is provided at the opposite end of each of the two pistons. A linear push module is also provided on the frame, and the output rod of the linear push module is coaxially rotatably connected to the drive rod.

2. The flexible circuit board constant speed roll-to-roll double-sided simultaneous laser direct writing exposure machine according to claim 1, characterized in that, The frame is provided with a mounting groove extending in a vertical direction. The end shafts of the first pressure roller and the second pressure roller are slidably disposed in the mounting groove in a vertical direction. The mounting groove is provided with a pressure adjusting component for adjusting the overall downward pressure of the first pressure roller and the second pressure roller.

3. The flexible circuit board constant speed roll-to-roll double-sided simultaneous laser direct writing exposure machine according to claim 2, characterized in that, The pressure regulating component includes: The sliding block is slidably disposed in the mounting groove in the vertical direction; An elastic element is disposed between the bottom end of the mounting groove and the sliding block; A threaded rod passes vertically through the frame and is threadedly connected to it, with the bottom end of the threaded rod abutting the top end of the sliding block.

4. The flexible circuit board constant speed roll-to-roll double-sided simultaneous laser direct writing exposure machine according to claim 1, characterized in that, Positioning rings are provided at both ends of the central shaft. The pressure regulating unit includes a rubber sleeve coaxially disposed outside the central shaft. Rubber rings distributed along its axial direction are provided on the inner circumference of the rubber sleeve. The inner circumference of the rubber rings is sealed to the outer circumferential surface of the central shaft. Adjacent rubber rings form a circular air bladder communicating with the air hole.

5. The flexible circuit board constant speed roll-to-roll double-sided simultaneous laser direct writing exposure machine according to claim 4, characterized in that, Two clamping rings are provided on the circumferential surface of the central shaft, and the rubber ring extends radially between the two clamping rings.

6. The flexible circuit board constant speed roll-to-roll double-sided simultaneous laser direct writing exposure machine according to any one of claims 1-3, characterized in that, The frame is also provided with a sliding groove extending in the vertical direction. A mounting block is provided in the sliding groove. An elastic buffer element is provided between the mounting block and the bottom end of the sliding groove. The end shaft of the shock-absorbing buffer roller passes through the mounting block and is rotatably connected to it.

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