A line length gradient positioning tool for impedance testing of FPC double-sided panels

Abstract

The application relates to the technical field of FPC double-panel impedance test positioning tool, in particular to a line length gradient positioning tool for FPC double-panel impedance test, which comprises a tool plate, a linear guide plate and a plate material and a feeding assembly. The linear guide plate is installed on the sliding part of the tool plate. In the application, the isolation film is fixedly connected to the inner side of the four-edge air bag, the four-edge air bag and the isolation film are communicated with the inflation pipe through the air bag gas path pipe and are installed on the inflation pipe, compressed gas is introduced into the inflation pipe to realize inflation expansion, and then a clamping action is formed on the plate material, which is beneficial to the adaptation of the shape tolerance and warping deformation of the FPC plate material. When clamping is too loose, micro-shifting of the plate material in the test displacement process is avoided, and the line length gradient wiring alignment offset is prevented. When clamping is too tight, the four-edge air bag and the isolation film are forced to be pressed to generate internal stress, which is helpful to the thermal expansion and cold contraction deformation in the superposition test process, stress release, prevention of gradient impedance data drift, distortion and the like.

Description

Technical Field

[0001] This invention relates to the technical field of FPC double-sided impedance testing positioning fixtures, specifically a line length gradient positioning fixture for FPC double-sided impedance testing. Background Technology

[0002] FPC double-sided boards are widely used in high-speed, high-frequency electronic equipment, where high-frequency signal transmission performance relies on precise control of trace characteristic impedance. The industry typically uses gradient coupon samples with varying trace lengths for impedance comparison testing. Differences in impedance data across different trace lengths are used to determine the stability of the board's manufacturing process and the quality of signal integrity. During impedance testing, the flatness of the FPC board clamping, positioning consistency, board surface cleanliness, and clamping stress directly determine the accuracy and repeatability of the gradient impedance test data.

[0003] Existing FPC double-sided impedance testing positioning fixtures have relatively simple shapes, making it difficult to adapt to the shape tolerances and warpage deformation of FPC boards. When the clamping is too loose, the board is prone to slight movement during the test displacement process, resulting in misalignment of the line length gradient routing and poor batch test consistency. When the clamping is too tight, the board is forcibly squeezed, generating internal stress. Combined with the thermal expansion and contraction deformation during the test process, the stress cannot be released, causing gradient impedance data drift and distortion. Summary of the Invention

[0004] The purpose of this invention is to provide a line length gradient positioning fixture for impedance testing of FPC double-sided boards, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A line length gradient positioning fixture for impedance testing of FPC double-sided boards includes a fixture plate, a linear guide plate, a sheet material, and a feeding assembly. The linear guide plate is mounted on a sliding portion of the fixture plate, and the sheet material is mounted on a mounting portion of the linear guide plate. The sliding portion of the feeding assembly connects the fixture plate and the linear guide plate. The assembly also includes... The airbag assembly is mounted on the tooling plate; A pre-clamping assembly is provided on the tooling plate; The linear guide plate has a sliding section with a rail installed on it. The tooling plate has limit stops on both sides, and a slide rail is installed on the limit stops. The plate has a four-sided airbag installed on the wrapping part, and an inflation tube is connected to the inflation point of the four-sided airbag.

[0006] As described above, the FPC double-sided impedance test line length gradient positioning fixture: the linear guide plate is slidably mounted on the inner side of the fixture plate via a track.

[0007] As described above, the line length gradient positioning fixture for impedance testing of FPC double-sided boards: the four-sided airbags are inflated and expanded through the inflation tubes to wrap around the board.

[0008] The line length gradient positioning fixture for impedance testing of FPC double-sided boards as described above: the airbag assembly includes an isolation membrane fixedly connected to the inside of the four airbags, and airbag air passage tubes are installed on the outside of the four airbags.

[0009] As described above, the FPC double-sided impedance test line length gradient positioning fixture: the four-sided airbag is connected to the inflation tube through the airbag air passage tube.

[0010] As described above, the FPC double-sided impedance test line length gradient positioning fixture includes: the pre-clamping component includes an upper air hole opened on the limiting stop edge, a lower air hole is provided at the connecting part of the upper air hole, a sliding elastic rod is fixed at the connecting part of the limiting stop edge, an inner cylinder is installed at the elastic retraction part of the sliding elastic rod, and a dust collection box is provided on the inner side of the fixture plate.

[0011] The line length gradient positioning fixture for FPC double-sided impedance testing as described above: the sliding elastic rod and the limiting stop are mounted on the slide rail through an internal cylinder.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the isolation membrane is fixedly connected to the inside of the four-sided airbags, and the four-sided airbags and the isolation membrane are connected to the inflation tube through the airbag air passage. Compressed gas is introduced through the inflation tube to achieve inflation and expansion, thereby forming a clamping effect on the board. This is beneficial for adapting to the shape tolerance and warpage deformation of the FPC board. When the clamping is too loose, it avoids the slight movement of the board during the test displacement process and prevents the alignment deviation of the line length gradient routing. When the clamping is too tight, the four-sided airbags and the isolation membrane adapt to the internal stress generated by the forced compression of the board, which helps to superimpose the thermal expansion and contraction deformation during the test process, release stress, and prevent the gradient impedance data from drifting or becoming distorted.

[0013] After the line length gradient positioning fixture has been tested and used, the upper and lower air holes on the limiting stop edge spray air to clean the surface of the fixture plate. The dust and impurities raised by the airflow are collected in the dust collection box. After the cleaning operation is completed, the limiting stop edge rebounds and returns to the two sides of the line length gradient positioning fixture under the combined action of the sliding elastic rod and the inner cylinder, preventing dust and impurities from getting stuck on the four-sided airbags and the isolation membrane. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 For the present invention Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This is a schematic diagram of the limiting stop edge of the present invention; Figure 4 This is a schematic diagram of the pre-clamping component of the present invention; Figure 5 This is a schematic diagram of the tooling plate of the present invention.

[0015] In the diagram: 1. Tooling plate; 2. Linear guide rail plate; 3. Track; 4. Plate material; 5. Limiting edge; 6. Inflation pipe; 7. Slide rail; 8. Four-sided airbag; 9. Isolation membrane; 10. Airbag air passage pipe; 11. Upper air blowing hole; 12. Lower air blowing hole; 13. Sliding elastic pull rod; 14. Internal cylinder; 15. Dust collection box. Detailed Implementation

[0016] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0017] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0018] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented even without certain specific details. In some instances, methods, means, and elements well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0019] Please see Figures 1-5 A linear gradient positioning fixture for impedance testing of FPC double-sided boards is proposed, which includes a fixture plate 1, a linear guide plate 2, a sheet material 4, and a feeding assembly.

[0020] A linear guide plate 2 is installed on the sliding part of the tooling plate 1. A plate 4 is provided on the mounting part of the linear guide plate 2. The sliding part of the feeding assembly is connected to the tooling plate 1 and the linear guide plate 2. An airbag assembly is installed on the tooling plate 1. A pre-clamping assembly is provided on the tooling plate 1. The plate 4 is placed on the linear guide plate 2, which is slidably mounted on the tooling plate 1. The sliding displacement of the linear guide plate 2 relative to the tooling plate 1 facilitates the adjustment and clamping positioning of the plate 4. Among them, the sliding part of the linear guide plate 2 is equipped with a rail 3, the tooling plate 1 is provided with limit stops 5 on both sides, the installation part of the limit stops 5 is provided with a slide rail 7, the wrapping part of the plate 4 is equipped with a four-sided airbag 8, and the inflation part of the four-sided airbag 8 is connected to an inflation tube 6.

[0021] In this embodiment, the plate 4 is placed on the linear guide plate 2, the linear guide plate 2 is slidably installed on the tooling plate 1, and the limiting edge 5 slides laterally with the help of the slide rail 7 to limit the two sides of the plate 4 to achieve pre-installation. Then, the four-sided airbag 8 is placed on the outer periphery of the plate 4, and gas is injected into the four-sided airbag 8 through the inflation tube 6. After the airbag is inflated, it hugs and clamps the plate 4.

[0022] Preferably, the linear guide plate 2 is slidably installed on the inner side of the tooling plate 1 via the track 3, and the plate 4 is fed to the inner side of the tooling plate 1 via the linear guide plate 2.

[0023] Preferably, the four-sided airbags 8 are inflated and expanded by the inflation tubes 6 and wrap around the plate 4. The four-sided airbags 8 are inflated by compressed gas through the inflation tubes 6, thereby forming a clamping effect on the plate 4. The four-sided airbags 8 can adaptively inflate and deform according to the shape and size of the plate 4, conforming to the edge contour of the plate 4 to complete flexible clamping, adapting to different shapes and sizes of the plate 4 and slightly warped plates 4, and achieving flexible clamping and positioning.

[0024] Please refer to Figure 1 and Figure 2 In this embodiment, the airbag assembly includes an isolation membrane 9 fixedly connected to the inside of the four-sided airbag 8, and an airbag air passage tube 10 is installed on the outside of the four-sided airbag 8.

[0025] The isolation membrane 9 is fixedly installed on the inner surface of the four-sided airbag 8. The isolation membrane 9 deforms synchronously with the four-sided airbag 8, isolating the four-sided airbag 8 from the plate 4 and preventing the airbag body from directly contacting the plate 4. The airbag cavity formed by the four-sided airbag 8 and the isolation membrane 9 is connected to the inflation pipe 6 through the airbag air passage pipe 10. When working, compressed gas is introduced through the inflation pipe 6. The gas enters the interior of the four-sided airbag 8 through the inflation pipe 6 and the airbag air passage pipe 10, driving the four-sided airbag 8 to inflate. After inflation, the four-sided airbag 8 presses against the side of the plate 4 through the isolation membrane 9, thereby forming a flexible clamping effect on the plate 4.

[0026] Preferably, the four-sided airbag 8 is connected to the inflation tube 6 through the airbag air passage tube 10, and the isolation membrane 9 is fixedly connected to the inside of the four-sided airbag 8. The four-sided airbag 8 and the isolation membrane 9 are connected and installed on the inflation tube 6 through the airbag air passage tube 10. Compressed gas is introduced through the inflation tube 6 to achieve inflation and expansion, thereby forming a clamping effect on the board 4. This is beneficial for adapting to the shape tolerance and warping deformation of the FPC board. When the clamping is too loose, it avoids the slight movement of the board 4 during the test displacement process and prevents the alignment deviation of the line length gradient routing. When the clamping is too tight, the four-sided airbag 8 and the isolation membrane 9 adapt to the internal stress generated by the forced compression of the board 4, which helps to superimpose the thermal expansion and contraction deformation during the test process, release stress, and prevent the gradient impedance data from drifting or becoming distorted.

[0027] Please refer to Figure 3 , Figure 4 and Figure 5 In this embodiment, the pre-clamping component includes an upper air hole 11 opened on the limiting stop 5, a lower air hole 12 provided at the connecting part of the upper air hole 11, a sliding elastic rod 13 fixed at the connecting part of the limiting stop 5, an inner cylinder 14 installed at the elastic retraction part of the sliding elastic rod 13, and a dust collection box 15 provided on the inner side of the tooling plate 1.

[0028] The limiting stop 5 is provided with an upper air blowing hole 11 and a lower air blowing hole 12. The limiting stop 5 is assembled on the inner cylinder 14 through a sliding elastic pull rod 13. Compressed gas is transported to the upper air blowing hole 11 and the lower air blowing hole 12 through the air passage, which can blow and clean the surface of the tooling plate 1. The dust and impurities blown up by the airflow are collected into the dust collection box 15, completing the collection and treatment of dust.

[0029] Preferably, the sliding elastic rod 13 and the limiting stop 5 are mounted on the slide rail 7 through the built-in cylinder 14. The limiting stop 5 is assembled on the built-in cylinder 14 through the sliding elastic rod 13. At the same time, the limiting stop 5 is slidably set on the slide rail 7. After the line length gradient positioning fixture is tested and used, the upper air hole 11 and the lower air hole 12 opened on the limiting stop 5 spray air to blow and clean the surface of the fixture plate 1. The dust and impurities raised by the airflow are collected in the dust collection box 15. After the blowing operation is completed, the limiting stop 5 rebounds and resets under the combined action of the sliding elastic rod 13 and the built-in cylinder 14, returning to the two sides of the line length gradient positioning fixture.

[0030] As can be seen from the above, during use, the sheet material 4 is placed on the linear guide plate 2, the linear guide plate 2 is slidably installed on the tooling plate 1, and the limiting edge 5 slides laterally with the help of the slide rail 7 to limit the two sides of the sheet material 4 for pre-installation. The isolation membrane 9 is fixedly connected to the inside of the four-sided airbag 8. The four-sided airbag 8 and the isolation membrane 9 are connected and installed on the inflation pipe 6 through the airbag air passage pipe 10. Compressed gas is introduced through the inflation pipe 6 to achieve inflation and expansion, thereby forming a clamping effect on the sheet material 4. This is beneficial for adapting to the shape tolerance and warping deformation of the FPC sheet material. When the clamping is too loose, it avoids the sheet material 4 from slightly shifting during the test displacement process and prevents the alignment deviation of the line length gradient routing.

[0031] The limiting stop 5 is mounted on the inner cylinder 14 via the sliding elastic rod 13. At the same time, the limiting stop 5 is slidably set on the slide rail 7. After the linear gradient positioning fixture is tested and used, the upper air hole 11 and lower air hole 12 opened on the limiting stop 5 spray air to blow and clean the surface of the fixture plate 1. The dust and impurities raised by the airflow are collected in the dust collection box 15 to prevent dust and impurities from getting stuck on the four-sided airbags 8 and the isolation membrane 9.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A linear length gradient positioning fixture for impedance testing of FPC double-sided boards, comprising a fixture plate (1), a linear guide plate (2), a sheet material (4), and a feeding assembly, wherein the linear guide plate (2) is mounted on a sliding part of the fixture plate (1), and the sheet material (4) is provided on a mounting part of the linear guide plate (2), and the fixture plate (1) and the linear guide plate (2) are connected to the sliding part of the feeding assembly, characterized in that: It also includes settings, An airbag assembly is mounted on the tooling plate (1); A pre-clamping assembly is disposed on the tooling plate (1); Among them, the linear guide plate (2) is equipped with a rail (3) at the sliding part, the tooling plate (1) is provided with limit stops (5) on both sides, the limit stops (5) is provided with a slide rail (7) at the mounting part, the plate (4) is equipped with a four-sided airbag (8), and the four-sided airbag (8) is connected to an inflation tube (6) at the inflation point.

2. The line length gradient positioning fixture for impedance testing of FPC double-sided boards according to claim 1, characterized in that, The linear guide plate (2) is slidably mounted on the inner side of the tooling plate (1) via the track (3).

3. The line length gradient positioning fixture for impedance testing of FPC double-sided boards according to claim 1, characterized in that, The four-sided airbag (8) is inflated and expands through the inflation tube (6) and wraps around the plate (4).

4. The line length gradient positioning fixture for impedance testing of FPC double-sided boards according to claim 1, characterized in that, The airbag assembly includes an isolation membrane (9) fixedly connected to the inside of the four-sided airbag (8), and an airbag airway tube (10) is installed on the outside of the four-sided airbag (8).

5. The line length gradient positioning fixture for impedance testing of FPC double-sided boards according to claim 4, characterized in that, The four-sided airbag (8) is connected to the inflation tube (6) through the airbag air passage tube (10).

6. The line length gradient positioning fixture for impedance testing of FPC double-sided boards according to claim 1, characterized in that, The pre-clamping assembly includes an upper air hole (11) opened on the limiting stop (5), a lower air hole (12) provided at the connecting part of the upper air hole (11), a sliding elastic rod (13) fixed at the connecting part of the limiting stop (5), an inner cylinder (14) installed at the elastic retraction part of the sliding elastic rod (13), and a dust collection box (15) provided on the inner side of the tooling plate (1).

7. The line length gradient positioning fixture for impedance testing of FPC double-sided boards according to claim 6, characterized in that, The sliding elastic rod (13) and the limiting stop (5) are mounted on the slide rail (7) through the built-in cylinder (14).

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