High-precision fpc soft board testing fixture
By designing a high-precision FPC flexible circuit board test fixture and adopting a floating pressure frame and elastic probe, the problems of high cost, poor stability and insufficient adaptability of existing fixtures are solved, and efficient and reliable FPC testing is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN LIANWEI ELECTRONICS
- Filing Date
- 2025-06-11
- Publication Date
- 2026-06-12
AI Technical Summary
Existing high-precision FPC flexible circuit board testing fixtures suffer from problems such as high manufacturing costs, difficult maintenance, expensive probe replacement, poor testing stability, and insufficient flexibility in adapting to small-batch production of various products.
A high-precision FPC flexible board test fixture was designed, comprising a base substrate, a probe module assembly, an actuator arm mechanism, a pressing mechanism assembly, and a connecting support shaft. It employs a floating pressure frame and special probes to achieve automatic fine-tuning of pressure and angle to protect the flexible board. Combined with an elastic structure, it provides constant contact pressure, reduces contact resistance, and prevents oxidation.
It enables high-precision electrical performance testing of FPC flexible circuit boards, protects the boards from damage, improves testing stability and production efficiency, and reduces manufacturing costs and maintenance difficulty.
Smart Images
Figure CN224354531U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field, and more specifically to a high-precision FPC flexible circuit board testing fixture. Background Technology
[0002] The core value of high-precision FPC (Flexible Printed Circuit) test fixtures lies in providing a highly adaptable testing solution for flexible circuit boards. These fixtures stabilize thin, easily warped FPCs through a vacuum adsorption system, combined with a floating pressure frame that adaptively adjusts the pressure distribution. This ensures reliable contact between the probes and micron-level test points while effectively avoiding physical damage to precision circuitry caused by traditional rigid fixtures. They are particularly suitable for durability testing in dynamic scenarios such as hinge areas of foldable screens and bending areas within wearable devices. Their quick-locking mechanism significantly improves production line changeover efficiency, while the precise layout of the probe array enables simultaneous testing of high-density circuit continuity, impedance, and signal integrity, drastically shortening the verification cycle for highly integrated FPCs in consumer electronics, medical devices, and other fields.
[0003] However, the complex structure of such fixtures also presents many challenges: the introduction of floating pressure frames and vacuum adsorption systems increases manufacturing costs and maintenance difficulty; the replacement cost of special probes is expensive; there are still limitations in the micro-variation analysis of ultra-thin flexible boards; the testing stability under extreme bending conditions needs to be optimized; at the same time, fixture calibration relies on professional technicians; and the adaptability is insufficient for multi-variety, small-batch production. Utility Model Content
[0004] In order to overcome the above-mentioned defects of the prior art, this utility model provides a high-precision FPC flexible circuit board testing fixture to solve the problems existing in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-precision FPC flexible circuit board testing fixture, including a base substrate, and further including: a probe module assembly, an actuator arm mechanism, a pressing mechanism assembly, and a connecting support shaft. The probe module assembly is fixedly installed on the upper side of the base substrate, an actuator arm mechanism is fixedly connected to one end of the probe module assembly, a pressing mechanism assembly is fixedly installed on the other end of the actuator arm mechanism, and a connecting support shaft is fixedly installed on the upper side of the base substrate.
[0006] Furthermore, the probe module assembly includes a probe fixing plate, an insulating support layer is fixedly installed on the upper side of the probe fixing plate, a signal adapter board is fixedly installed on the upper side of the insulating support layer, and a cable interface is fixedly installed on the right side of the insulating support layer.
[0007] Furthermore, the bottom of the probe fixing plate includes heat dissipation holes and weight reduction holes, and four guide posts are symmetrically distributed and fixedly installed on the bottom of the probe fixing plate.
[0008] Furthermore, the pressing mechanism assembly includes an insulating base, the right side of which includes a rocker arm connection port, a frame fixedly mounted on the upper side of the insulating base, an insulating plate fixedly mounted inside the frame, a locking structure symmetrically mounted on the upper side of the frame, a probe array base fixedly mounted on the upper side of the insulating plate, a test probe evenly distributed on the upper side of the probe array base, and a probe protective cover fixedly mounted on the upper side of the test probe.
[0009] Furthermore, the pressing mechanism assembly is symmetrically distributed along the locking structure, and five screws are evenly distributed on the locking structure.
[0010] Furthermore, the base plate, probe module assembly, actuator arm mechanism, and pressing mechanism assembly are symmetrical about the center of the structure, and are fixedly connected by four evenly distributed link support shafts after symmetry. One end of the actuator arm mechanism is fixedly installed in the rocker arm connection port.
[0011] The technical effects and advantages of this utility model are as follows:
[0012] 1. This utility model, by incorporating a test probe, helps ensure stable and reliable current conduction or signal transmission. When the fixture is closed, the probe tip precisely presses against the test pads on the FPC flexible board surface. At this time, the internal spring provides constant and gentle contact pressure, automatically compensating for differences in board thickness or minor unevenness. The probe surface undergoes a special plating treatment to reduce contact resistance and prevent oxidation. Its durability directly determines the repeatability of the entire testing process and the service life of the fixture.
[0013] 2. This utility model, by incorporating a floating pressure frame, provides in-depth protection against the fragility of the FPC flexible circuit board. When the pressing mechanism drives it to contact the flexible circuit board, the floating pressure frame can sense the resistance or height difference in local areas and automatically fine-tune the downward pressure and angle to distribute the pressure evenly, avoiding damage to precision circuits or solder joints. While achieving reliable contact, it maximizes the protection of the expensive flexible circuit board under test. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0015] Figure 2 This is a schematic diagram of the overall structure of the probe module assembly of this utility model;
[0016] Figure 3 This is a schematic diagram of the pressing mechanism assembly of this utility model;
[0017] The attached figures are labeled as follows: 1. Base plate; 2. Probe module assembly; 201. Probe fixing plate; 202. Signal adapter plate; 203. Insulating support layer; 204. Cable interface; 205. Guide post; 206. Heat dissipation hole; 207. Weight reduction hole; 3. Actuating arm mechanism; 4. Pressing mechanism assembly; 401. Insulating base; 402. Rocker arm connection port; 403. Floating pressure frame; 404. Locking structure; 405. Probe array base; 406. Test probe; 407. Probe protective cover; 408. Insulating plate; 5. Connecting support shaft. Detailed Implementation
[0018] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The high-precision FPC flexible circuit board testing fixture involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0019] Reference Figures 1 to 3 This utility model provides a high-precision FPC flexible board testing fixture, including a base substrate 1, and further including: a probe module assembly 2, an actuator arm mechanism 3, a pressing mechanism assembly 4, and a connecting support shaft 5. The probe module assembly 2 is fixedly installed on the upper side of the base substrate 1. The actuator arm mechanism 3 is fixedly connected to one end of the probe module assembly 2, and the pressing mechanism assembly 4 is fixedly installed on the other end of the actuator arm mechanism 3. The connecting support shaft 5 is fixedly installed on the upper side of the base substrate 1.
[0020] The probe module assembly 2 includes a probe fixing plate 201, an insulating support layer 203 is fixedly installed on the upper side of the probe fixing plate 201, a signal adapter plate 202 is fixedly installed on the upper side of the insulating support layer 203, and a cable interface 204 is fixedly installed on the right side of the insulating support layer 203.
[0021] The probe fixing plate 201 has heat dissipation holes 206 and weight reduction holes 207 at its bottom, which can optimize the overall weight of the fixture and improve the portability of operation. Four guide posts 205 are symmetrically distributed and fixedly installed at the bottom of the probe fixing plate 201.
[0022] The pressing mechanism assembly 4 includes an insulating base 401. The right side of the insulating base 401 includes a rocker arm connection port 402. A frame 403 is fixedly mounted on the upper side of the insulating base 401, which facilitates in-depth protection of the FPC flexible circuit board's vulnerability. When the pressing mechanism contacts the flexible circuit board, the floating pressure frame can sense local resistance or height differences and automatically fine-tune the downward pressure and angle to evenly distribute the pressure, avoiding damage to precision circuits or solder joints. This achieves reliable contact while maximizing the protection of the expensive FPC under test. The frame 403... An insulating plate 408 is fixedly installed on the inner side of the frame 403. A locking structure 404 is symmetrically installed on the upper side of the frame 403. A probe array base 405 is fixedly installed on the upper side of the insulating plate 408. Sixteen test probes 406 are evenly distributed on the upper side of the probe array base 405, which helps to ensure stable and reliable current conduction or signal transmission. When the fixture is closed, the tip of the probe will accurately press against the test pad on the surface of the FPC flexible board. At this time, the internal spring provides constant and gentle contact pressure, automatically compensating for differences in the thickness of the flexible board or minor unevenness. The probe surface has undergone special plating treatment, which can reduce contact resistance and prevent oxidation. Its durability directly determines the repeatability accuracy of the entire testing process and the service life of the fixture. A probe protective cover 407 is fixedly installed on the upper side of the test probe 406.
[0023] The pressing mechanism assembly 4 is symmetrically distributed along the locking structure 404, and five screws are evenly distributed on the locking structure 404 to improve the stability of the device.
[0024] Among them, the base plate 1, probe module assembly 2, actuator arm mechanism 3, and pressing mechanism assembly 4 are symmetrically arranged along the center of the structure and are fixedly connected by four evenly distributed link support shafts 5. One end of the actuator arm mechanism 3 is fixedly installed in the rocker arm connection port 402.
[0025] The working principle of this invention is as follows: When using the instrument, the operator first carefully places the high-precision FPC flexible circuit board to be tested in the designated area of the probe fixing plate 201. After the flexible circuit board is fixed, the actuator arm mechanism 3 begins to move, and its force is transmitted to the entire pressing mechanism assembly 4 through the rocker arm connection port 402 connected to one end. Driven by the actuator arm, the pressing mechanism begins to move downward along the set trajectory.
[0026] As the pressing mechanism descends, the floating pressure frame 403 first contacts the FPC flexible circuit board. Upon sensing potential height differences or localized deformation on the board surface, the floating pressure frame makes minor self-adjustments to ensure uniform pressure distribution on the lower layer, preventing excessive localized stress from damaging the delicate circuitry. The pressing process continues. Once the floating pressure frame is in position, the probe array base 405 drives the densely arranged test probes 406 to move steadily downwards. The elastic structure inside the probes gently presses the probe tips onto the test pads of the flexible circuit board. The testing equipment can apply test signals to the flexible circuit board or read its response through pathways such as the signal adapter board 202 and cable interface 204, completing high-precision testing of the FPC flexible circuit board's electrical performance.
[0027] After the test is completed, the actuator arm mechanism 3 moves in the reverse direction, driving the pressing mechanism assembly 4 to rise smoothly through the rocker arm connection port 402, and the test probe 406 safely detaches from the surface of the FPC flexible board. Finally, the operator can easily remove the tested FPC flexible board, and the entire fixture is ready for the next test cycle.
[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A high-precision FPC flexible circuit board testing fixture, comprising a base substrate (1), characterized in that, Also includes: The probe module assembly (2), the actuator arm mechanism (3), the pressing mechanism assembly (4), and the connecting support shaft (5) are fixedly installed on the upper side of the base plate (1). The actuator arm mechanism (3) is fixedly connected to one end of the probe module assembly (2), and the pressing mechanism assembly (4) is fixedly installed on the other end of the actuator arm mechanism (3). The connecting support shaft (5) is fixedly installed on the upper side of the base plate (1).
2. The high-precision FPC flexible circuit board testing fixture according to claim 1, characterized in that: The probe module assembly (2) includes a probe fixing plate (201), an insulating support layer (203) is fixedly installed on the upper side of the probe fixing plate (201), a signal adapter board (202) is fixedly installed on the upper side of the insulating support layer (203), and a cable interface (204) is fixedly installed on the right side of the insulating support layer (203).
3. The high-precision FPC flexible circuit board testing fixture according to claim 2, characterized in that: The probe fixing plate (201) has heat dissipation holes (206) at its bottom and weight reduction holes (207) at its bottom. Four guide posts (205) are symmetrically distributed and fixedly installed on the bottom of the probe fixing plate (201).
4. The high-precision FPC flexible circuit board testing fixture according to claim 1, characterized in that: The pressing mechanism assembly (4) includes an insulating base (401), the right side of which includes a rocker arm connection port (402). A frame (403) is fixedly installed on the upper side of the insulating base (401), an insulating plate (408) is fixedly installed on the inner side of the frame (403), a locking structure (404) is symmetrically installed on the upper side of the frame (403), a probe array base (405) is fixedly installed on the upper side of the insulating plate (408), 16 test probes (406) are evenly distributed on the upper side of the probe array base (405), and a probe protective cover (407) is fixedly installed on the upper side of the test probes (406).
5. The high-precision FPC flexible circuit board testing fixture according to claim 4, characterized in that: The pressing mechanism assembly (4) is symmetrically distributed along the locking structure (404), and five screws are evenly distributed on the locking structure (404).
6. The high-precision FPC flexible circuit board testing fixture according to claim 2, characterized in that: The base plate (1), probe module assembly (2), actuator arm mechanism (3), and pressing mechanism assembly (4) are symmetrical about the center of the structure and are fixedly connected by four evenly distributed link support shafts (5) after symmetry.
7. The high-precision FPC flexible circuit board testing fixture according to claim 2, characterized in that: One end of the boom mechanism (3) is fixedly installed in the rocker arm connection port (402).