Optical module soft board welding jig

Abstract

The utility model relates to a kind of optical module soft board welding jigs, comprising: bottom plate;Fine adjustment sliding table, be located in the bottom plate, for the relative position of fine adjustment PCBA and soft board;PCBA fixed seat, be located in the fine adjustment sliding table, for positioning and carrying PCBA;Optical device fixed module, be located in the bottom plate and independent of the PCBA fixed seat, for releasably locking optical device;Compression module, independent of the optical device fixed module, and at least having respectively independently movable cover, first pressing block and second pressing block, for synchronously or step-by-step to PCBA board, soft board and optical device exert vertical compression force, so that three adhere to each other.The utility model can realize the three-step independent compression of PCBA board, soft board and optical device, can be quickly locked and compatible with multiple models of optical module soft board welding, reach once clamping to complete accurate positioning, guarantee welding safe and reliable.

Description

Technical Field

[0001] This utility model relates to the field of optical communication device manufacturing technology, and in particular to a welding fixture for optical module flexible circuit boards. Background Technology

[0002] In recent years, with the explosive growth of big data algorithms and AI technologies, optical modules are evolving towards higher speeds and higher integration. Flexible printed circuit boards (FPCBs), as the key interconnecting medium between PCBAs and optical devices, directly determine signal integrity and long-term reliability through their soldering quality. However, existing production lines still commonly use a manual method of "handheld soldering pen + solder" to complete the step-by-step soldering of PCBA pins, FPCBs, and optical devices. This process has the following prominent drawbacks: In existing optical module PCBAs, flexible circuit boards, and optical devices, soldering involves directly applying solder to the pins of the flexible circuit board, optical device, and PCBA board using a soldering pen. Holding the solder wire in one hand and the soldering pen in the other, the operator's hand is prone to shaking, resulting in uneven solder application, bridging, or cold solder joints. The first-time soldering pass rate is less than 85%. Furthermore, the shaking soldering tip is highly likely to touch fingers, posing a high risk of burns and poor safety.

[0003] There are no precise positioning and clamping measures between the three layers of PCBA, flexible circuit board and optical components. During the welding process, the relative slippage caused by thermal stress results in pad offset >0.1 mm, leading to a high rate of subsequent repair welding and rework, with an average welding time of more than 90 seconds per piece.

[0004] Traditional simple fixtures only provide rough positioning of the shape and cannot eliminate board thickness tolerance and PCBA warping. The pad gap is often greater than 30 µm, which is difficult to meet the micron-level requirements of solder joint impedance consistency for 400 G / 800 G high-speed modules.

[0005] Changing product models requires removing screws and replacing the entire positioning plate, which takes 2-3 hours to debug. The clamping process is cumbersome and severely restricts flexible production of small batches and multiple varieties.

[0006] In summary, traditional manual soldering and related fixtures can no longer meet the production requirements of high-speed optical modules for high solder joint consistency, high yield, and rapid changeover. There is an urgent need for a flexible circuit board soldering fixture for optical modules to address the shortcomings of existing technologies. Utility Model Content

[0007] Therefore, the technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a welding fixture for optical module flexible circuit boards, which can realize three-step independent pressing of PCBA board, flexible circuit board and optical device, one-click fast locking and is compatible with multiple models of optical module flexible circuit board welding fixture, so as to achieve accurate positioning in one clamping and ensure welding safety and reliability.

[0008] To solve the above-mentioned technical problems, this utility model provides a welding fixture for optical module flexible circuit boards, characterized in that it includes: Base plate; A fine-tuning slide, mounted on the base plate, is used to adjust the relative position of the PCBA board and the flexible board. PCBA mounting bracket, fixed on the fine-tuning slide for positioning and mounting PCBA board; A fixing module, mounted on the base plate, is used to lock the optical device; the fixing module includes a support member, a positioning member, and a quick-locking member; the support member is mounted on the base plate as a carrying platform for the optical device; the positioning member is mounted on the support member and is used to position the optical device; the quick-locking member is connected to the support block and can press or release the optical device to achieve vertical fixation; A pressing module is used to apply vertical pressing force to PCBA boards, flexible boards, and optical devices to keep them in a close fit. The pressing module includes a cover plate, a first pressing block, and a second pressing block. The cover plate is used to press the PCBA board, the first pressing block is used to press the flexible board, and the second pressing block is used to press the optical devices. In one embodiment of this utility model, a limiting groove for positioning the PCBA is provided in the PCBA fixing seat, and a floating support structure is provided in the limiting groove.

[0009] In one embodiment of this utility model, the floating support structure includes a floating cylindrical pin and a spring. The spring is embedded in the bottom of a blind hole in the limiting groove. The floating cylindrical pin is coaxially placed in the blind hole and presses against the spring, with its upper end extending out to elastically position the PCBA board.

[0010] In one embodiment of this utility model, the front end of the floating cylindrical pin is provided with a chamfer.

[0011] In one embodiment of this utility model, positioning pins are provided around the limiting groove on the PCBA fixing base for positioning the cover plate, and positioning holes adapted to the positioning pins are provided on the cover plate.

[0012] In one embodiment of this utility model, both the first pressing block and the second pressing block are provided with a lateral rotation shaft for flipping and opening / closing.

[0013] In one embodiment of this utility model, countersunk holes are provided on the cover plate, the first pressing block and the second pressing block, and permanent magnets are embedded in the countersunk holes.

[0014] In one embodiment of this utility model, a ball-headed top wire is provided in the countersunk hole, and the spherical end of the ball-headed top wire abuts against the upper end of the permanent magnet to adjust the magnetic gap and change the magnetic attraction force.

[0015] In one embodiment of this utility model, the slide is an XY axis slide module, which can simultaneously adjust the position of the PCBA mounting base in the X and Y directions.

[0016] In one embodiment of this utility model, the quick-locking component is a wrench, which is hinged to the side wall of the positioning component via a horizontal pin. When the wrench rotates, it pushes against the support component, quickly pressing or releasing the optical device.

[0017] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects: The optical module flexible board welding fixture described in this utility model completely decouples the positioning and pressing functions of the PCBA board, flexible board and optical device. Each part is accurately aligned first and then pressed together as a whole, eliminating interlayer misalignment in one go. It can achieve one-click fast locking and is compatible with multiple models. It can complete the precise positioning in one clamping and ensure the welding safety and reliability. Attached Figure Description

[0018] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. Figure 1 This is a schematic diagram of the structure of the optical module flexible circuit board welding fixture in a preferred embodiment of this utility model; Figure 2 for Figure 1 A top view of the optical module flexible circuit board welding fixture shown; Figure 3 for Figure 1 A cross-sectional view of the optical module flexible circuit board welding fixture shown; Figure 4 for Figure 1 An exploded view of the optical module flexible circuit board welding fixture shown. Instruction manual drawing reference numerals: 1. Base plate; 2. Fine-tuning slide; 3. PCBA mounting base; 31. Limiting groove; 4. Spring; 5. Floating cylindrical pin; 6. Cover plate; 7. First pressure block; 8. Flexible board; 9. Second pressure block; 10. Optical component; 11. Positioning component; 12. Quick locking component; 13. Support component; 14. Floating set screw; 15. PCBA board. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0020] Reference Figure 1-4 As shown, the present invention provides a welding fixture for optical module flexible circuit boards, comprising: Base plate 1; The fine-tuning slide 2 is set on the base plate 1 and is used to adjust the relative position of the PCBA board 15 and the flexible board 8. PCBA mounting bracket 3 is fixed on the fine-tuning slide 2 for positioning and mounting PCBA board 15; An optical device fixing module is disposed on the base plate 1 and is independent of the PCBA fixing base 3, and is used to releasably lock the optical device 10; The pressing module, independent of the optical device fixing module, has at least a cover plate 6, a first pressing block 7 and a second pressing block 9 that can move independently, for applying vertical pressing force to the PCBA board 15, the flexible board 8 and the optical device 10 simultaneously or in stages, so that the three are bonded together.

[0021] The fine-tuning slide 2 can fine-tune the relative position of PCBA board 15 and flexible board 8, eliminate the positional deviation between the flexible board pads and the pins of PCBA board 15 and optical device 10, and realize continuous and precise welding of PCBA board 15-flexible board 8 and flexible board 8-optical device 10.

[0022] Furthermore, the optical device fixing module includes a support member 13, a positioning member 11, and a quick-locking member 12: the support member 13 is fixed to the base plate 1 and forms a support platform for the optical device 10; the positioning member 11 is installed on the support member 13 and is used to position the optical device 10 in the horizontal direction; the quick-locking member 12 is connected to the support member 13 and can quickly switch between the pressing position and the releasing position to press or release the optical device 10 in the vertical direction; the optical device fixing module composed of the support member 13, the positioning member 11, and the quick-locking member 12 can lock the optical device 10 in seconds with one hand after pre-positioning it horizontally, reducing the loading and unloading time from minutes to seconds, and greatly improving the production line cycle time.

[0023] Furthermore, the pressing module includes a cover plate 6, a first pressing block 7, and a second pressing block 9: the cover plate 6 is used to press the PCBA board 15 in the vertical direction; the first pressing block 7 is used to press the flexible board 8 connecting the optical device 10 and the PCBA board 15; the second pressing block 9 is used to press the top of the optical device 10; wherein, the cover plate 6, the first pressing block 7, and the second pressing block 9 move independently relative to the base plate 1 between the open position and the pressing position, so as to realize the synchronous or stepwise pressing of the PCBA board 15, the flexible board 8, and the optical device 10.

[0024] The PCBA mounting bracket 3 has a positioning groove 31 for positioning the PCBA, and a floating support structure is provided in the positioning groove 31. The floating support structure in the positioning groove 31 changes the rigid positioning to elastic support, automatically compensates for the warpage / thickness tolerance of the PCBA board 15, and ensures that the pads and the flexible board 8 are always coplanar, thus reducing the rate of cold solder joints.

[0025] The floating support structure includes a floating cylindrical pin 5, a spring 4, and a floating set screw 14. The spring 4 is embedded in the bottom of a blind hole within the limiting groove 31. The floating cylindrical pin 5 is coaxially positioned within the blind hole and presses against the spring 4, with its upper end extending out to elastically position the PCBA board 15. The floating set screw 14 is screwed into the side wall of the blind hole to limit the axial travel of the floating cylindrical pin 5. The front end of the floating cylindrical pin 5 is chamfered.

[0026] Positioning pins are provided around the limiting groove 31 on the PCBA mounting base 3 to position the cover plate 6. Positioning holes that are adapted to the positioning pins are provided on the cover plate 6.

[0027] Furthermore, both the first pressure block 7 and the second pressure block 9 are equipped with lateral rotation axes for flipping and opening. The lateral rotation axis design of the first pressure block 7 and the second pressure block 9 allows the pressure blocks to be opened like a flipbook, with an unobstructed view, doubling the efficiency of placing and retrieving parts, and eliminating the need to completely remove the pressure blocks, thus reducing the risk of losing parts.

[0028] In this embodiment, countersunk holes are provided on the cover plate 6, the first pressing block 7, and the second pressing block 9, and permanent magnets are embedded in the countersunk holes. Ball-headed set screws are installed in the countersunk holes, with the spherical end of the set screw abutting the upper end of the permanent magnet, used to adjust the magnetic gap to change the magnetic attraction force. The three pressing blocks have built-in permanent magnets, using magnetic force to maintain a normally closed state, eliminating the need for locking hooks / screws, and changing the pressing-release process from "twisting" to "flipping," shortening the operation time for a single piece. The ball-headed set screws adjust the magnetic gap, allowing stepless changes in magnetic attraction force, preventing overpressure damage to the flexible plate 8 while ensuring sufficient fit for thick plates; a single fixture covers all thickness specifications.

[0029] Among them, the fine-tuning slide 2 is an XY-axis slide module, which can simultaneously adjust the position of the PCBA mounting base 3 in the X and Y directions. The XY-axis slide module can achieve knob-type micron-level movement. This module is a mature commercial product in the field and can be purchased directly without the need for separate design. During installation, it is locked to the base plate 1 with M6 screws, and the upper platform is connected to the PCBA mounting base 3. Before soldering, manually rotating the micrometer head can compensate the relative error between the pads of the PCBA board 15 and the flexible board 8 to ≤10 µm within 5 seconds. Then, tighten the side brake nut to complete the position locking.

[0030] In this embodiment, the quick-locking component 12 is a wrench. The wrench is hinged to the side wall of the positioning component 11 via a horizontal pin. When the wrench rotates, it pushes against the support component 13, quickly tightening or releasing the optical device 10. The quick-locking component 12, with the wrench and the horizontal pin rotating 90°, completes the locking / releasing process. This amplifies the lever arm, reduces the operating force, prevents fatigue during long-term operation, eliminates thread seizing, and requires no maintenance for life.

[0031] The optical device 10 described in this embodiment includes, but is not limited to, TO (Transistor Outline) packaged lasers, TO packaged detectors, BOX packaged light emitting components, COB (Chip On Board) packaged laser chips, butterfly packaged modulators, or other coaxial / surface packaged optoelectronic devices. The fixture structure is applicable to all of the above packaging forms; only the contour dimensions of the support member 13 and the positioning member 11 need to be replaced or adjusted accordingly.

[0032] The optical module flexible circuit board welding fixture based on the above structure can simultaneously weld PCBA board 15 and flexible circuit board 8, and flexible circuit board 8 and optical device 10. Its working process is as follows: Before using the fixture, adjust the preload of the floating structure to generate a moderate elastic force from the combination of spring 4 and floating cylindrical pin 5. This will not only lift the PCBA board 15 elastically, but also ensure that the PCBA board 15 can be smoothly inserted into the limiting groove 31 of the PCBA fixing base 3 without jamming. At the same time, confirm that the final height of the PCBA board 15 in the limiting groove 31 and the XY center position have been set in place.

[0033] Then, open each pressing component in sequence: lift the cover plate 6, flip the first pressing block 7, flip the second pressing block 9 to the side, loosen the positioning component 11 and lift the quick locking component 12 to release the optical device fixing module.

[0034] Loading sequence: First, place the PCBA board 15 into the PCBA fixing base 3, and the floating cylindrical pin 5 automatically compensates for board thickness / warping; then place the optical device 10 on the support 13, and the positioning component 11 completes the initial horizontal positioning; place the flexible board 8 on top, so that one end of it overlaps with the pin of the optical device 10 and the other end overlaps with the pad of the PCBA board 15.

[0035] Closing process: Press down the quick-locking component 12 in sequence, and the positioning component 11 locks the optical component 10; close the second pressure block 9 to press the top of the optical component 10; put down the first pressure block 7 to press the middle section of the flexible board 8; finally close the cover plate 6 and make its positioning hole match the positioning pin of the PCBA fixing base 3. The permanent magnet in the cover plate 6 provides continuous pressure to ensure that the PCBA board 15, the flexible board 8, and the optical component 10 are fully fitted without gaps.

[0036] Fine-tuning stage: Using a fine-tuning slide to move the PCBA fixing seat 3 at the micrometer level, observe in real time the alignment of the pads of the flexible board 8 with the pins of the optical device 10 and the pads of the PCBA board 15 until the offset is ≤0.01 mm, thus completing the precise alignment.

[0037] Soldering stage: Use a soldering pen to apply solder along the pads of the flexible board 8 in sequence. The solder is fully wetted under the constant voltage of the permanent magnet to form reliable solder joints. After visually inspecting the solder joints for brightness, fullness and no defects with a magnifying glass, open the cover plate 6, the first pressure block 7 and the second pressure block 9 in reverse order to remove the soldered PCBA assembly as a whole and enter the next cycle.

[0038] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An optical module flexible board welding jig, characterized by, include: Base plate; A fine-tuning slide, located on the base plate, is used to fine-tune the relative position of the PCBA and the flexible board; PCBA mounting bracket, located on the fine-tuning slide, is used to position and support the PCBA; An optical device fixing module is disposed on the base plate and is independent of the PCBA fixing base, for releasably locking the optical device; The pressing module, independent of the optical device fixing module, has at least a cover plate, a first pressing block, and a second pressing block that can move independently, for applying vertical pressing force to the PCBA board, flexible board, and optical device synchronously or stepwise, so that the three are bonded together.

2. The optical module flexible circuit board welding fixture according to claim 1, characterized in that, The fixing module includes: The support component is fixed to the base plate and forms a support platform for the optical device; A positioning element, installed on the support element, is used to position the optical device horizontally. A quick-locking component, connected to the support component, can quickly switch between a pressed position and a released position to press or release the optical device in the vertical direction.

3. The optical module soft board welding jig according to claim 1, wherein The pressing module includes: Cover plate, used to press PCBA boards vertically; The first pressure block is used to press the flexible board connecting the optical device and the PCBA board; The second pressure block is used to press the top of the optical device; The cover plate, the first pressing block, and the second pressing block move independently relative to the base plate between the open position and the pressing position to achieve synchronous or step-by-step pressing of the PCBA board, flexible board, and optical device.

4. The optical module soft board welding jig according to claim 1, wherein The PCBA mounting base is provided with a limiting groove for positioning the PCBA, and a floating support structure is provided in the limiting groove.

5. The optical module soft board welding jig according to claim 4, wherein The floating support structure includes a floating cylindrical pin and a spring. The spring is embedded in the bottom of the blind hole in the limiting groove. The floating cylindrical pin is coaxially placed in the blind hole and presses against the spring. Its upper end extends out to elastically position the PCBA board.

6. The optical module soft board welding jig according to claim 4, characterized in that: The PCBA mounting base is provided with positioning pins around the limiting groove for positioning the cover plate, and the cover plate is provided with positioning holes that are adapted to the positioning pins.

7. The optical module flexible circuit board welding fixture according to claim 1, characterized in that, Both the first and second pressing blocks are provided with lateral rotation shafts for flipping and opening / closing.

8. The optical module soft board welding jig according to claim 1, characterized in that: The cover plate, the first pressing block and the second pressing block are all provided with countersunk holes, and permanent magnets are embedded in the countersunk holes.

9. A welding fixture for optical module flexible circuit boards according to claim 8, characterized in that: A ball-headed top wire is installed inside the countersunk hole. The spherical end of the ball-headed top wire abuts against the upper end of the permanent magnet and is used to adjust the magnetic gap to change the magnetic attraction force.

10. The optical module soft board welding jig according to claim 1, characterized in that: The slide is an XY axis slide module, which can simultaneously adjust the position of the PCBA mounting base in the X and Y directions.

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