Contact type test equipment for display screen circuit board
Through the combination of signal shunt rigid circuit board and flexible FPC of the contact test equipment, the high coverage test problem of the test point-free display circuit board is solved, and efficient and low-cost circuit board testing is achieved, with strong adaptability and no test traces.
Patent Information
- Application Number
- CN202421820463.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-07-30
AI Technical Summary
The prior art cannot effectively test display circuit boards without test points, with small test points sizes and no test traces allowed. Traditional testing methods are prone to damage the circuit board, and are costly and have low test coverage.
Using contact testing equipment, the signal shunt rigid circuit board and flexible FPC is used to drive the bearing base movement through the motor and the adjusting screw, and the clamping cylinder and the clamping plate are used to fix the circuit board, so as to achieve accurate docking between the gold finger and the flexible FPC, and conduct high coverage tests without test points.
A full-function test with high coverage is achieved, with a test pass rate of more than 97%, avoiding circuit board damage, reducing testing costs, and strong adaptability.
Smart Images
Figure CN223155151U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of circuit board testing, and particularly relates to a contact testing device for a display circuit board. Background Technique
[0002] Since the traditional display circuit board adopts a probe or conductive adhesive type testing method, it is necessary to have sufficient test points on the display circuit board, ensure a large size of the detection position, allow test traces, have a sufficient board thickness and not be easily pierced, etc.; for display circuit boards with insufficient test points, small test point sizes, and not allowing test traces to be caused, traditional methods cannot be used for testing.
[0003] Analyzing from the industry, due to factors such as product miniaturization, component density, and higher functional requirements of products, reducing the reserved test points and shrinking the test point size have become the trend in the industry; in the case of insufficient test points, traditional testing technologies cannot meet the full-functional testing of products; in the case of smaller test point sizes, the traditional probe method for testing not only has a high cost of the testing device, but also has a low test throughput.
[0004] In circuit design, the circuit network is complex, and insufficient test points cannot achieve a high coverage rate of components and circuits, posing a certain hidden danger to the omission of product defects. Content of the Utility Model
[0005] The purpose of the utility model is to provide a contact testing device for a display circuit board to solve the problems of high testing support plate and easy surface damage of the circuit board existing in the existing probe or conductive adhesive type testing method as mentioned in the above background technique.
[0006] To achieve the above object, the present utility model provides the following technical solution: A contact type testing device for a display circuit board, including a placement pedestal. An adjusting lead screw is rotatably installed inside the placement pedestal. A motor is fixedly installed on the side of the placement pedestal, and the output shaft of the motor is fixedly connected to the adjusting lead screw. A lower moving plate is threadedly installed on the outer surface of the adjusting lead screw. An upper connecting plate is fixedly installed on the upper surface of the lower moving plate. The upper connecting plate passes through a strip-shaped slideway opened on the upper surface of the placement pedestal and extends out of the placement pedestal and is fixedly installed with a bearing pedestal. A clamping cylinder is fixedly installed inside the bearing pedestal. A hinge seat is fixedly installed at the end of the piston rod of the clamping cylinder. Two hinge arms are hingedly installed on the hinge seat. The end of the hinge arm away from the hinge seat is hingedly installed with an upper moving plate. An upper connecting plate is fixedly installed on the upper surface of the upper moving plate. The upper connecting plate passes through a channel opened on the upper surface of the bearing pedestal and extends out of the bearing pedestal and is fixedly installed with a positioning plate. A column is fixed on the upper surface of the placement pedestal, and a top plate is fixedly installed at the top of the column. A test screen and a test cylinder are fixedly installed on the upper surface of the top plate. A mounting plate is fixedly installed at the end of the piston rod of the test cylinder. A signal splitting rigid circuit board is fixedly installed on the lower surface of the mounting plate. A flexible FPC is detachably installed on the lower surface of the signal splitting rigid circuit board. The flexible FPC is electrically connected to the signal splitting rigid circuit board, and the signal splitting rigid circuit board is electrically connected to the test screen.
[0007] As a preferred embodiment, a plurality of guide rods are fixedly installed inside the placement pedestal, and the lower moving plate is slidably installed on the outer surfaces of the plurality of guide rods.
[0008] With the above scheme, when the adjusting lead screw rotates to drive the lower moving plate to move, the lower moving plate will slide on the surface of the guide rod during movement. The guide rod is used to support and guide the lower moving plate, improving the movement stability and preventing shaking.
[0009] As a preferred embodiment, two fixing plates are fixedly installed on the upper surface of the placement pedestal, and a monitoring camera is fixedly installed on the side of the fixing plate. The two monitoring cameras are symmetrically arranged on both sides of the bearing pedestal.
[0010] With the above scheme, the setting of the monitoring camera can be used to view the test situation in real time, and the position can be adjusted adaptively according to the position of the circuit board's gold fingers.
[0011] As a preferred embodiment, a plurality of limiting rods are fixed on the inner wall of the bearing pedestal, and the upper moving plate is slidably installed on the outer surfaces of the corresponding limiting rods.
[0012] With the above scheme, the cooperation of the limiting rods can be used to guide the movement of the upper moving plate and improve the movement smoothness.
[0013] As a preferred embodiment, anti-slip rubber pads are pasted on the sides of the clamping plates, and the two anti-slip rubber pads are arranged oppositely.
[0014] With the above solution, the anti-slip rubber pads can play an anti-slip and fixing effect when the clamping plates tightly fix the circuit board, and can avoid direct contact between the clamping plates and the circuit board, thus preventing hard extrusion damage.
[0015] As a preferred embodiment, a plurality of telescopic rods are fixed on the lower surface of the top plate, and the bottom ends of the telescopic rods are fixedly connected to the upper surface of the mounting plate.
[0016] With the above solution, the telescopic rods can support the up and down movement of the mounting plate, improve the movement smoothness and prevent shaking.
[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0018] The contact testing device for the display screen circuit board realizes the fixed clamping of the circuit board to be tested by setting a bearing pedestal in cooperation with the clamping plates and the clamping cylinders, and cooperates with the testing cylinder to drive the mounting plate to move up and down, and then drives the signal shunting rigid circuit board and the flexible FPC to move up and down to realize testing. It realizes the contact testing technology for the display screen circuit board without test points, small detection positions and not allowing test traces. Without passing through traditional test points, it uses the tiny and dense gold fingers of the product to be tested as the detection positions, connects each gold finger through contact bonding with the gold fingers at one end of a special flexible FPC, and magnifies the other end of the connecting wire of the flexible FPC into a contact point or a connector; realizes the transmission of the signal of the circuit board from the gold fingers to the special flexible FPC, then to the signal shunting rigid circuit board, and then to the test screen. Since the gold fingers of the display screen circuit board are the terminal outputs of the entire circuit network, not only the circuit signals are complete, but also the network coverage is comprehensive. Therefore, by using the contact testing technology for the display screen circuit board, high coverage rate and full-function testing can be realized;
[0019] At the same time, the flexible FPC can realize dense circuit and multi-layer circuit wiring. Only by replacing the damaged flexible FPC, it can be applied to bridge the circuit board of the product to be tested and the signal shunting rigid circuit board at low cost. It not only has advantages in application cost, but also is relatively simple in technical implementation and design;
[0020] With the cooperation of the monitoring camera vision application, the accuracy of the contact connection is relatively high, so that the test passing rate is relatively high, and generally the test passing rate can reach more than 97%;
[0021] Meanwhile, the contact pressing method is adopted, and the gold fingers of the circuit board to be tested are in one-to-one area contact with the gold fingers of the special flexible FPC, so there is no trace on the gold fingers of the FPCA to be tested;
[0022] The contact test equipment for the display circuit board realizes the horizontal position movement of the bearing pedestal by setting the motor to cooperate with the adjusting lead screw. Furthermore, the position adjustment of the circuit board can be realized on the premise that the circuit board is clamped, and then the circuit board can be adaptively adjusted according to the position of the gold fingers on the circuit board, improving the universality. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 is a schematic structural diagram of the present utility model;
[0024] Figure 2 is a schematic structural diagram of the cross-section of the placement pedestal of the present utility model;
[0025] Figure 3 is a schematic structural diagram of the cross-section of the bearing pedestal of the present utility model;
[0026] Figure 4 is a schematic structural diagram of the top plate of the present utility model.
[0027] In the figure: 1. Placement pedestal; 2. Adjusting lead screw; 3. Motor; 4. Lower moving plate; 5. Lower connecting plate; 6. Bearing pedestal; 7. Upper connecting plate; 8. Clamping cylinder; 9. Hinge seat; 10. Hinge arm; 11. Upper moving plate; 12. Positioning plate; 13. Column; 14. Top plate; 15. Test screen; 16. Test cylinder; 17. Mounting plate; 18. Signal shunting rigid circuit board; 19. Fixed plate; 20. Monitoring camera; 21. Guide rod; 22. Limiting rod; 23. Anti-slip rubber pad; 24. Telescopic rod; 25. Flexible FPC. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0028] Please refer to Figures 1-4, the present utility model provides a contact testing device for a display circuit board, including a placement pedestal 1. An adjusting lead screw 2 is rotatably installed inside the placement pedestal 1. A motor 3 is fixedly installed on the side of the placement pedestal 1, and the output shaft of the motor 3 is fixedly connected to the adjusting lead screw 2. A lower moving plate 4 is threadedly installed on the outer surface of the adjusting lead screw 2. An upper connecting plate 5 is fixedly installed on the upper surface of the lower moving plate 4. The upper connecting plate 5 extends out of the placement pedestal through a strip-shaped slideway opened on the upper surface of the placement pedestal 1 and is fixedly installed with a bearing pedestal 6. A clamping cylinder 8 is fixedly installed inside the bearing pedestal 6. The end of the piston rod of the clamping cylinder 8 is fixedly installed with a hinge seat 9. Two hinge arms 10 are hingedly installed on the hinge seat 9. One end of the hinge arm 10 away from the hinge seat 9 is hingedly installed with an upper moving plate 11. An upper connecting plate 7 is fixedly installed on the upper surface of the upper moving plate 11. The upper connecting plate 7 extends out of the bearing pedestal 6 through a channel opened on the upper surface of the bearing pedestal 6 and is fixedly installed with a clamping plate 12. A column 13 is fixed on the upper surface of the placement pedestal 1, and a top plate 14 is fixedly installed at the top of the column 13. A test screen 15 and a test cylinder 16 are fixedly installed on the upper surface of the top plate 14. The end of the piston rod of the test cylinder 16 is fixedly installed with a mounting plate 17. A signal shunting rigid circuit board 18 is fixedly installed on the lower surface of the mounting plate 17. A flexible FPC 25 is detachably installed on the lower surface of the signal shunting rigid circuit board 18. Electrical connection is established between the flexible FPC 25 and the signal shunting rigid circuit board 18, and electrical connection is established between the signal shunting rigid circuit board 18 and the test screen 15.
[0029] A number of guide rods 21 are fixedly installed inside the placement pedestal 1. The lower moving plate 4 is slidably installed on the outer surfaces of the number of guide rods 21. When the adjusting lead screw 2 rotates to drive the lower moving plate 4 to move, the lower moving plate 4 will slide on the surface of the guide rods 21. The guide rods 21 are used to support and guide the lower moving plate 4, improve the movement stability, and prevent shaking.
[0030] Two fixing plates 19 are fixedly installed on the upper surface of the placement pedestal 1. A monitoring camera 20 is fixedly installed on the side of the fixing plate 19. The two monitoring cameras 20 are symmetrically arranged on both sides of the bearing pedestal 6. The setting of the monitoring camera 20 can be used to view the test situation in real time, and the position can be adjusted adaptively according to the position of the circuit board's gold fingers.
[0031] A number of limiting rods 22 are fixed on the inner wall of the bearing pedestal 6. The upper moving plate 11 is slidably installed on the outer surfaces of the corresponding limiting rods 22. The cooperation of the limiting rods 22 can be used to guide the movement of the upper moving plate 11 and improve the movement smoothness.
[0032] An anti-slip rubber pad 23 is pasted on the side surface of the clamping plate 12. The two anti-slip rubber pads 23 are arranged oppositely. The setting of the anti-slip rubber pad 23 can play an anti-slip and fixing effect when the clamping plate 12 clamps and fixes the circuit board, and can avoid direct contact between the clamping plate 12 and the circuit board, thus causing hard extrusion damage.
[0033] A plurality of telescopic rods 24 are fixed on the lower surface of the top plate 14. The bottom ends of the telescopic rods 24 are fixedly connected to the upper surface of the mounting plate 17. The setting of the telescopic rods 24 can support the up and down movement of the mounting plate 17, improve the movement smoothness and prevent shaking.
[0034] During use, place the circuit board to be tested on the surface of the bearing pedestal 6 and between the two clamping plates 12. Start the clamping cylinder 8. The clamping cylinder 8 drives the hinge seat 9 to move, and under the action of the hinge arm 10, drives the upper moving plates 11 on both sides to move relatively. Then, through the upper connecting plate 7, drives the clamping plates 12 on both sides to move relatively to realize the clamping of the circuit board. After clamping, stop the clamping cylinder 8. Check the position of the gold fingers on the circuit board through the monitoring camera 20, and start the motor 3 to drive the adjusting lead screw 2 to move, and then drive the lower moving plate 4 to move. Thus, drive the bearing pedestal 6 to move through the lower connecting plate 5, so that the circuit board moves synchronously. After adjusting the gold fingers of the circuit board to directly below the gold fingers of the flexible FPC 25, stop the motor 3. Start the test cylinder 16, and then drive the mounting plate 17 to move downward, thereby driving the signal shunting rigid circuit board 18 and the flexible FPC 25 to move downward, so that the gold fingers of the flexible FPC 25 are attached to the gold fingers of the circuit board to achieve testing.
Claims
1. A contact testing device for a display circuit board, characterized in that: It includes a placement pedestal (1), inside which an adjustment lead screw (2) is rotatably installed. On the side of the placement pedestal (1), a motor (3) is fixedly installed, and the output shaft of the motor (3) is fixedly connected to the adjustment lead screw (2). A lower moving plate (4) is threadedly installed on the outer surface of the adjustment lead screw (2). On the upper surface of the lower moving plate (4), a lower connecting plate (5) is fixedly installed. The lower connecting plate (5) passes through a strip-shaped slideway opened on the upper surface of the placement pedestal (1) and extends out of the placement pedestal and is fixedly installed with a bearing pedestal (6). Inside the bearing pedestal (6), a clamping cylinder (8) is fixedly installed. At the end of the piston rod of the clamping cylinder (8), a hinge seat (9) is fixedly installed. Two hinge arms (10) are hingedly installed on the hinge seat (9). At the end of the hinge arm (10) away from the hinge seat (9), an upper moving plate (11) is hingedly installed. On the upper surface of the upper moving plate (11), an upper connecting plate (7) is fixedly installed. The upper connecting plate (7) passes through a channel opened on the upper surface of the bearing pedestal (6) and extends out of the bearing pedestal (6) and is fixedly installed with a clamping plate (12). On the upper surface of the placement pedestal (1), a column (13) is fixed. At the top of the column (13), a top plate (14) is fixedly installed. On the upper surface of the top plate (14), a test screen (15) and a test cylinder (16) are fixedly installed. At the end of the piston rod of the test cylinder (16), a mounting plate (17) is fixedly installed. On the lower surface of the mounting plate (17), a signal splitting rigid circuit board (18) is fixedly installed. A flexible FPC (25) is detachably installed on the lower surface of the signal splitting rigid circuit board (18). There is an electrical connection between the flexible FPC (25) and the signal splitting rigid circuit board (18), and there is an electrical connection between the signal splitting rigid circuit board (18) and the test screen (15).
2. The contact testing device for the display circuit board according to claim 1, wherein: Inside the placement pedestal (1), several guide rods (21) are fixedly installed, and the lower moving plate (4) is slidably installed on the outer surfaces of the several guide rods (21).
3. The contact type testing device for a display circuit board according to claim 1, characterized in that: On the upper surface of the placement pedestal (1), two fixing plates (19) are fixedly installed. On the side of the fixing plate (19), a monitoring camera (20) is fixedly installed. The two monitoring cameras (20) are symmetrically arranged on both sides of the bearing pedestal (6).
4. The contact type testing device for a display circuit board according to claim 1, characterized in that: On the inner wall of the bearing pedestal (6), several limiting rods (22) are fixed, and the upper moving plate (11) is slidably installed on the outer surfaces of the corresponding limiting rods (22).
5. The contact testing device for a display circuit board according to claim 1, characterized in that: On the side of the clamping plate (12), an anti-slip rubber pad (23) is pasted, and the two anti-slip rubber pads (23) are arranged oppositely.
6. The contact testing device for a display circuit board according to claim 1, characterized in that: On the lower surface of the top plate (14), several telescopic rods (24) are fixed, and the bottom ends of the telescopic rods (24) are fixedly connected to the upper surface of the mounting plate (17).