A flying probe test positioning fixture applied to an FPC board

Abstract

The utility model relates to a flying probe test positioning fixture for FPC board, including lower fixture and upper fixture, and the printing board is clamped between lower fixture and upper fixture, the one end of lower fixture and upper fixture corresponds and is connected through hinged structure, and the hinged structure includes two side plates, is fixed to the both sides of lower fixture one end symmetry, and extends upwards along its top, and one slide is movably installed in each side plate, two rotating blocks are connected to the both sides of upper fixture one end portion symmetry, and two rotating blocks are connected with two slides through two connecting shafts, and lifting structure connects two connecting shafts, according to the thickness of printing board, the clamping distance between lower fixture and upper fixture is adjusted. The utility model discloses a lifting structure, realizes the adjustment of the clamping distance between upper fixture and lower fixture. The adjustment range can reach 0.5mm to 15mm, can cover the common thickness of FPC board, can adapt to different product demand, avoids frequently replacing the fixture, reduces the production cost, and improves the test efficiency and accuracy.

Description

Technical Field

[0001] This utility model relates to the field of rigid-flex PCB testing technology, and more specifically to a flying probe testing positioning fixture for FPC boards. Background Technology

[0002] Flexible printed circuit boards (FPCs), due to their thinness, flexibility, and high wiring density, have become core components in consumer electronics such as smartphones and wearable devices. To ensure the circuit connectivity and defect-free nature of FPCs, flying probe testing is a critical step in production, requiring stable clamping and precise positioning of the FPC board using fixtures. Limitations of traditional fixtures:

[0003] 1. Fixed clamping distance issue: Conventional fixtures use a separate structure (upper and lower fixtures are connected by bolts or clips), with a fixed clamping distance, which is only suitable for FPC boards of a single thickness. When dealing with products of different thicknesses, frequent fixture changes are required, resulting in low testing efficiency and increased equipment costs.

[0004] 2. Shortcomings of existing improvement solutions: For example, the patent document (CN209927899U) proposes a solution using adhesive tape to connect the upper and lower fixtures. Although this simplifies the operation, the elasticity of the tape is limited, and the clamping distance cannot be actively adjusted. Especially for FPC boards with large thickness differences, the tape is prone to losing its adhesiveness or resilience due to excessive stretching, resulting in unstable clamping and affecting the testing accuracy.

[0005] Therefore, there is an urgent need for a flying probe test fixture with dynamically adjustable clamping distance, which can ensure clamping stability while being compatible with FPC boards of different thicknesses, thereby reducing the frequency of fixture replacement, lowering production costs, and improving testing efficiency and accuracy. Utility Model Content

[0006] Therefore, the purpose of this utility model is to propose a flying probe test positioning fixture for FPC boards, which solves the problem that existing FPC board fixtures cannot adapt to the clamping and testing needs of FPC boards of different thicknesses.

[0007] The technical solution of this utility model is a flying probe testing positioning fixture applied to FPC boards, including a lower fixture and an upper fixture, wherein the printed circuit board is clamped between the lower fixture and the upper fixture; one end of the lower fixture and the upper fixture are connected by a hinge structure, wherein the hinge structure includes:

[0008] Two side plates are symmetrically fixed to both sides of one end of the lower fixture and extend upward along its top. A sliding component is movably installed in each side plate.

[0009] Two rotating blocks are symmetrically connected to both sides of one end of the upper fixture, and the two rotating blocks are connected to the two sliding parts through two connecting shafts.

[0010] The lifting structure connects the two connecting shafts and adjusts the clamping distance between the lower fixture and the upper fixture according to the thickness of the printing plate.

[0011] According to the positioning fixture of this utility model, the upper fixture has a connecting groove between the two rotating blocks, and the two connecting shafts extend from the side corresponding to the connecting groove and do not contact each other.

[0012] According to the positioning clamp of this utility model, the lifting structure includes:

[0013] The control bolt has a connecting hole on the lower fixture near the connecting groove, and the connecting hole is threaded to the control bolt.

[0014] The lifting block is located in the clearance space formed by the connecting groove, and its two ends are respectively connected to the two connecting shafts. The middle part has a threaded hole that is threadedly connected to the control bolt.

[0015] Rotating the control bolt drives the lifting block to move up and down, and the rotating block and the sliding member work together to adjust the clamping distance between the lower fixture and the upper fixture.

[0016] According to the positioning fixture of this utility model, each of the side plates has a guide groove inside for the sliding member to move up and down.

[0017] According to the positioning fixture of this utility model, positioning holes are provided at the four outer corners of the lower fixture and the upper fixture. Positioning pins are passed through the corresponding positioning holes to position the upper fixture and the lower fixture.

[0018] According to the positioning fixture of this utility model, the upper fixture is provided with a rigid test port and a flexible test port, and the lower fixture is provided with multiple sets of lower fixture test ports corresponding to the rigid test port and the flexible test port.

[0019] According to the positioning fixture of this utility model, the sliding element is a slider.

[0020] According to the positioning fixture of this utility model, the top of the control bolt has a butterfly-shaped operating handle.

[0021] As can be seen from the above technical solution, compared with the prior art, this utility model has the following beneficial effects:

[0022] 1. This utility model features adaptive clamping distance adjustment: The clamping distance between the upper and lower fixtures is adjusted via a lifting structure. The adjustment range is from 0.5mm to 15mm, covering common FPC board thicknesses (e.g., 0.1mm to 12mm), adapting to different product requirements and avoiding frequent fixture changes.

[0023] 2. The four corner positioning holes and positioning pins of this utility model have a fit tolerance of H7 / g6 (clearance fit), ensuring that the alignment accuracy of the upper and lower fixtures after clamping is ≤±0.1mm, thus avoiding test probe misalignment. The gap between the slider and the side plate guide groove is controlled at 0.05-0.1mm, balancing smooth sliding and anti-shaking ability, with a displacement of ≤0.05mm during clamping. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 A schematic diagram of a flying probe testing positioning fixture for FPC boards provided by this utility model;

[0026] Figure 2 The diagram shows the structure of the upper fixture;

[0027] Figure 3 The diagram shows the structure of the lower fixture. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Flexible printed circuit boards (FPCs) have become core components of consumer electronics due to their thinness, flexibility, and high wiring density. To ensure the circuit continuity and defect-free nature of FPCs, flying probe testing is a critical step in production, requiring stable clamping and precise positioning of the FPC board using fixtures. Traditional fixtures connect the upper and lower jigs with bolts or clips, resulting in a fixed clamping distance, suitable only for FPC boards of a single thickness. When dealing with products of varying thicknesses, frequent fixture changes are necessary, leading to low testing efficiency and increased equipment costs. Existing solutions have shortcomings: while using adhesive tape to connect the upper and lower jigs simplifies operation, the tape's elasticity is limited, preventing active adjustment of the clamping distance. Especially for FPC boards with significant thickness variations, the tape is prone to losing its adhesiveness or resilience due to excessive stretching, resulting in unstable clamping and affecting testing accuracy.

[0031] In view of this, the present invention provides a flying probe testing positioning fixture for FPC boards, comprising a lower fixture 1 and an upper fixture 2, wherein a printed circuit board 3 is clamped between the lower fixture 1 and the upper fixture 2; see attached drawing. Figure 1-3 The lower fixture 1 provides support, while the upper fixture 2 provides clamping. During use, the FPC rigid-flex printed circuit board 3 is positioned between the lower fixture 1 and the upper fixture 2. The upper fixture 2 has a rigid test port 4 and a flexible test port 5. The lower fixture 1 has multiple sets of lower fixture test ports 16. Positioning holes 6 are provided at the four outer corners of both the lower fixture 1 and the upper fixture 2. When the FPC rigid-flex printed circuit board 3 is clamped between the upper fixture 2 and the lower fixture 1, the upper fixture 2 and the lower fixture 1 are symmetrically distributed vertically. At this time, positioning pins 8 are used to pass through the corresponding positioning holes 6 to fix the lower fixture 1 and the upper fixture 2, so that the lower fixture 1 and the upper fixture 2 are relatively fixed and the FPC rigid-flex printed circuit board 3 is clamped securely.

[0032] The lower fixture 1 and the upper fixture 2 are connected by a hinge. Specifically, one side of the upper fixture 2 has a connecting groove 11, and a pair of symmetrical rotating blocks 9 are fixedly spliced ​​to one end of the upper fixture 2 corresponding to the connecting groove 11. Each set of rotating blocks 9 is equipped with a connecting shaft 10. The lower fixture 1 is fixedly mounted with symmetrical side plates 12, and each set of side plates 12 has a sliding component 13. The opposite sides of the two sets of rotating blocks 9 are rotatably connected to the sliding component 13 through the connecting shaft 10. A lifting block 14 is provided on the top surface of the lower fixture 1, and a control bolt 15 is rotatably mounted on the lifting block 14. The top surface of the fixture 1 has a connecting hole. The lower end of the control bolt 15 is threaded to the lower fixture 1. The two sets of rotating blocks 9 are rotatably connected to the lifting block 14 through the connecting shaft 10 on the side that is close to each other. When the upper fixture 2 is opened, the upper fixture 2 rotates around the connecting shaft 10. The opening and closing of the upper fixture 2 can be easily controlled by the rotating block 9, the connecting shaft 10, the slider 13 and the lifting block 14. By adjusting the height of the rotating block 9, the connecting shaft 10, the slider 13 and the lifting block 14, the distance between the upper fixture 2 and the lower fixture 1 can be adjusted, so as to effectively clamp FPC printed circuit boards of different thicknesses.

[0033] See Figure 1 The side plate 12, rotating block 9, sliding member 13, and connecting shaft 10 form a hinged structure. Specifically, the upper fixture 2 has a connecting groove 11 between the two rotating blocks 9, and the two connecting shafts 10 extend from the side corresponding to the connecting groove 11 without contacting each other.

[0034] The control bolt 15 and the lifting block 14 form a lifting structure. The lower fixture 1 has a connecting hole near the connecting groove 11, and the connecting hole is threadedly connected to the control bolt 15. The lifting block 14 is located within the clearance space formed by the connecting groove 11, and its two ends are respectively connected to two connecting shafts 10. Its middle portion has a threaded hole that is threadedly connected to the control bolt 15. Rotating the control bolt 15 drives the lifting block 14 to move up and down, and the rotating block 9 and the sliding member 13 work together to adjust the clamping distance between the lower fixture 1 and the upper fixture 2. The top of the control bolt 15 has an operating handle.

[0035] In this invention, the threaded holes of the control bolt and the lifting block adopt fine thread (pitch ≤ 1mm), and the effective length of the thread is ≥ 20mm, ensuring that the remaining engagement length of the thread is ≥ 5mm when the maximum adjustment height (15mm) is reached, thus preventing disengagement.

[0036] See appendix Figure 3 Each of the side plates 12 has a guide groove inside for the slider 13 to move up and down.

[0037] Advantageously, positioning holes 6 are provided at the four outer corners of the lower fixture 1 and the upper fixture 2, and positioning pins 8 are passed through the corresponding positioning holes 6 to position and fix the upper fixture 2 and the lower fixture 1.

[0038] In this embodiment of the present invention, the slider 13 is a slider.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] The fixture structure and assembly of this utility model:

[0041] The hinge structure is implemented as follows: Side plates 12 are welded to both sides of one end of the lower fixture 1. Guide grooves are machined within the side plates 12. The slider 13 can be a nylon slider, with a clearance fit (0.05mm clearance on one side). A connecting groove 11 is machined at one end of the upper fixture 2, and rotating blocks 9 can be fixed to both sides with pins. A connecting shaft 10 (5mm diameter) is installed in the rotating block 9. Both ends of the connecting shaft 10 are inserted into the shaft holes of the slider 13 and the lifting block 14, respectively (tolerance H7 / h6).

[0042] Lifting structure design:

[0043] The lifting block can be made of aluminum alloy, with an M10×1 fine thread hole (thread length 25mm) machined in the middle to match the threaded rod (length 50mm) of the control bolt 15. The control bolt 15 has a butterfly-shaped operating handle (diameter 30mm) at the top, and a limiting ring (outer diameter 12mm, thickness 2mm) can be machined at the end of the thread. When the lifting block 14 descends to its lowest point, the limiting ring abuts against the surface of the lower fixture 1, preventing the bolt from continuing to unscrew.

[0044] Clamping distance adjustment operation: Rotate the control bolt 15 counterclockwise to drive the lifting block 14 to move upward (1mm per revolution), which in turn pushes the rotating block 9 to rotate around the sliding member 13 via the connecting shaft 10. The upper fixture 2 opens with the hinge shaft as the fulcrum, increasing the clamping distance. After placing the FPC board, rotate the control bolt 15 clockwise to move the lifting block 14 downward, closing the upper fixture 2 until the FPC board is clamped. Insert the positioning pins 8 (3mm in diameter, tolerance -0.01mm) into the four corner positioning holes 6 (3.02mm in diameter) to lock the fixture position.

[0045] Anti-disengagement verification: When the lifting block 14 is raised to its maximum height (15mm), the remaining engagement length of the threaded rod of the control bolt 15 = 50mm (total length) - 15mm (lifting stroke) = 35mm, which is much greater than the safe engagement length (≥5mm). The limit ring design ensures that the lifting block 14 cannot descend below the surface of the lower fixture 1, thus preventing the threads from completely disengaging.

[0046] Test port layout: A flexible test port 5 is located in the central area of ​​the upper fixture 2, and two rigid test ports 4 are located on either side of the flexible test port 5. The rigid test ports correspond to the test points in the rigid circuit areas of the FPC board. The flexible test port 5 allows the probe to contact the bent parts of the FPC board. The lower fixture test port 16 is aligned with the upper fixture test port to ensure that the probe contacts the testing machine after penetrating the FPC board.

[0047] This invention utilizes the cooperation of the lower fixture 1 and the upper fixture 2 to provide a reliable positioning and clamping system for the FPC rigid-flex printed circuit board 3. The lower fixture 1 provides stable support, while the upper fixture 2 applies clamping force, firmly fixing the FPC rigid-flex printed circuit board 3 between them. Positioning holes 6 located at the four outer corners of the upper fixture 2 and the lower fixture 1, used in conjunction with positioning pins 8, ensure that the lower fixture 1 and the upper fixture 2 remain relatively fixed when clamping the FPC rigid-flex printed circuit board 3. This design effectively avoids testing errors caused by fixture shaking or printed circuit board displacement during flying probe testing, significantly improving the accuracy of test results and reducing the probability of misjudgment due to inaccurate testing, thus laying a solid foundation for the quality inspection of the FPC rigid-flex printed circuit board 3.

[0048] The fixture can adjust the clamping distance according to the different thicknesses of the FPC rigid-flex printed circuit board 3, making it highly adaptable. The height of the lifting block 14 can be flexibly adjusted by controlling the rotation of the control bolt 15. The lifting block 14 drives the slider 13 to slide via the rotating block 9 and connecting shaft 10, achieving precise control of the clamping distance between the upper fixture 2 and the lower fixture 1. This design allows one set of fixtures to adapt to the testing needs of various FPC rigid-flex printed circuit boards 3 with different thicknesses, avoiding the cumbersome operation of changing different fixtures due to differences in printed circuit board thickness, reducing equipment procurement costs for enterprises, and improving the versatility and practicality of the testing equipment.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0050] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A flying probe testing positioning fixture for FPC boards, comprising a lower fixture (1) and an upper fixture (2), wherein a printed circuit board (3) is clamped between the lower fixture (1) and the upper fixture (2); characterized in that, The lower fixture (1) and the upper fixture (2) are connected at one end by a hinge structure, the hinge structure comprising: Two side plates (12) are symmetrically fixed to both sides of one end of the lower fixture (1) and extend upward along its top. Each side plate (12) has a sliding component (13) movably installed inside it. Two rotating blocks (9) are symmetrically connected to both sides of one end of the upper fixture (2), and the two rotating blocks (9) are connected to the two sliding parts (13) respectively through two connecting shafts (10); The lifting structure connects the two connecting shafts (10) and adjusts the clamping distance between the lower fixture (1) and the upper fixture (2) according to the thickness of the printing plate (3).

2. The flying probe testing and positioning fixture for FPC boards according to claim 1, characterized in that, The upper fixture (2) has a connecting groove (11) between the two rotating blocks (9), and the two connecting shafts (10) extend out from the side corresponding to the connecting groove (11) and do not contact each other.

3. A flying probe testing and positioning fixture for FPC boards according to claim 2, characterized in that, The lifting structure includes: The control bolt (15) has a connecting hole on the lower fixture (1) near the connecting groove (11), and the connecting hole is threaded to the control bolt (15); The lifting block (14) is located in the clearance space formed by the connecting groove (11), and its two ends are respectively connected to the two connecting shafts (10). The middle part has a threaded hole that is threadedly connected to the control bolt (15). Rotating the control bolt (15) drives the lifting block (14) to move up and down, and the rotating block (9) and the sliding piece (13) work together to adjust the clamping distance between the lower fixture (1) and the upper fixture (2).

4. A flying probe testing positioning fixture for FPC boards according to claim 3, characterized in that, Each of the side plates (12) has a guide groove inside for the sliding member (13) to move up and down.

5. A flying probe testing positioning fixture for FPC boards according to any one of claims 1-4, characterized in that, The lower fixture (1) and the upper fixture (2) are provided with positioning holes (6) at their four outer corners. Positioning pins (8) are inserted through the corresponding positioning holes (6) to position the upper fixture (2) and the lower fixture (1).

6. A flying probe testing positioning fixture for FPC boards according to any one of claims 1-4, characterized in that, The upper fixture (2) is provided with a rigid test port (4) and a flexible test port (5), and the lower fixture (1) is provided with multiple sets of lower fixture test ports (16) corresponding to the rigid test port (4) and the flexible test port (5).

7. A flying probe testing positioning fixture for FPC boards according to any one of claims 1-4, characterized in that, The slider (13) is a block.

8. A flying probe testing and positioning fixture for FPC boards according to claim 3, characterized in that, The control bolt (15) has a butterfly-shaped operating handle at the top.

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