A piezoelectric ceramic nozzle FPC flexible circuit board testing device

Abstract

The utility model relates to a piezoelectric ceramic nozzle FPC flexible circuit board testing arrangement, including probe fixed assembly, and the first drive mechanism of drive probe fixed assembly along X axle direction removal, the probe detection end of probe fixed assembly side is equipped with FPC soft board fixed assembly, and the second drive mechanism of drive FPC soft board fixed assembly along Z axle direction removal, the gold finger of FPC soft board fixed by FPC soft board fixed assembly corresponds with the probe fixed by probe fixed assembly. The utility model through first drive mechanism and second drive mechanism have realized the accurate movement of probe along X axle direction, and the accurate movement to gold finger vertical direction, realize accurate positioning, have guaranteed that probe and gold finger contact height and horizontal direction in vertical direction two relative positions, and have realized single / multiple probe simultaneous test, improved the automation test efficiency, the drive mechanism removal precision of X axle direction and Z axle direction, simple structure, high feasibility, low cost.

Description

Technical Field

[0001] This utility model relates to the field of circuit board testing technology, specifically to a piezoelectric ceramic nozzle FPC flexible circuit board testing device. Background Technology

[0002] Flexible printed circuit boards (FPCs) offer advantages such as high wiring density, thinness, foldability, and interference resistance, playing a crucial role in the integration and lightweighting trends of electronic devices. The core working principle of piezoelectric ceramic printheads is to precisely control the ejection of tiny ink droplets using the piezoelectric effect. In a piezoelectric ceramic printhead, the PCB and FPC are connected via connectors. The PCB receives digital image data from a computer, which is then processed by the PCB chip and converted into voltage pulse signals. These signals are transmitted through the FPC's gold fingers to the piezoelectric ceramic ink channels. Specifically, one end of the FPC has N gold fingers that are connected to N independent electrodes on the piezoelectric ceramic ink channels via a bonding process. Each gold finger outputs a voltage pulse signal to its corresponding piezoelectric ceramic ink channel. Upon receiving the voltage pulse signal, the piezoelectric ceramic ink channel deforms based on the piezoelectric effect, ejecting ink droplets onto the substrate. Therefore, testing the accuracy and consistency of the voltage pulse signals output by the FPC's gold fingers becomes a key factor affecting print quality.

[0003] Due to the large number and small spacing of FPC gold fingers, the testing process typically uses probes as the conductive contact medium. However, during the contact process, it is difficult to precisely control the vertical contact height and the relative position of the probe and gold fingers in both directions. Specifically: if the vertical contact height is too high, the probe and gold fingers will not make complete contact, resulting in circuit failure; if the contact height is too low, the probe will deform and the gold fingers will be damaged. If the horizontal direction cannot be accurately positioned, and the probe is caught between two gold fingers, it will cause a short circuit, damaging the PCB and the chip. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a piezoelectric ceramic nozzle FPC flexible circuit board testing device, which solves the problems of difficulty in accurately positioning the probe and gold finger relative to each other in the vertical and horizontal directions and low testing efficiency.

[0005] This utility model is achieved through the following technical solution: a testing device for a piezoelectric ceramic nozzle FPC flexible circuit board is provided, including a probe fixing assembly and a first driving mechanism for driving the probe fixing assembly to move along the X-axis direction. The probe fixing assembly has an FPC flexible board fixing assembly on the side where the probe detection end is located, and a second driving mechanism for driving the FPC flexible board fixing assembly to move along the Z-axis direction. The gold fingers of the FPC flexible board fixed by the FPC flexible board fixing assembly correspond to the probes fixed by the probe fixing assembly.

[0006] In use, this solution uses a probe fixing assembly to fix the probe and an FPC flexible board fixing assembly to fix the FPC flexible board. The first drive mechanism ensures the relative position of the probe and the gold fingers of the FPC flexible board in the horizontal direction, and the second drive mechanism controls the relative position of the probe and the gold fingers of the FPC flexible board in the vertical direction.

[0007] As an optimization, the probe fixing assembly is provided with mounting slots adapted to the probes. These mounting slots are arranged sequentially along the X-axis, and the spacing between adjacent mounting slots is an integer multiple of the spacing between the gold fingers of the FPC flexible board. This optimization scheme, by setting mounting slots, avoids probe misalignment and further ensures precise positioning between the probes and the gold fingers. Setting the spacing of the mounting slots to an integer multiple of the gold finger spacing can meet the testing requirements of a larger number of gold fingers.

[0008] As an optimization, the probe fixing assembly includes a fixing base and a fixing cover on the top surface of the fixing base. The fixing base and the fixing cover are detachably fixed together. The bottom surface of the fixing cover has an upper contour groove, and the top surface of the fixing base has a lower contour groove opposite to the upper contour groove. The upper and lower contour grooves are engaged to form the mounting groove. This optimized probe fixing assembly uses the fixing cover to press and fix the probe onto the fixing base. It has a simple structure, is easy to assemble and disassemble, and the upper and lower contour grooves together limit the probe's position, improving the probe's fixing effect.

[0009] As an optimization, the first driving mechanism includes two fixed blocks arranged along the X-axis, a movable block located between the two fixed blocks, and a lead screw passing through and threadedly connected to the movable block along the X-axis. One end of the lead screw is rotatably connected to one of the fixed blocks, and the other end passes through the other fixed block and is connected to a first driving motor. A guide rod parallel to the lead screw and passing through the movable block is also fixed on the fixed block. The probe fixing assembly is mounted on the movable block. This optimized first driving mechanism uses a lead screw and nut mechanism, which improves the accuracy of the movement of the probe fixing assembly and further improves the relative positional accuracy between the probe and the gold finger.

[0010] As an optimization, at least one fixed block is fixed with a first limit switch that is disposed opposite to the moving block along the X-axis direction, and the first limit switch is electrically connected to the first drive motor.

[0011] This optimization scheme uses a first limit switch to detect the initial position of the moving block, thereby achieving the positioning of the probe's initial position and ensuring the accuracy of the probe's movement distance.

[0012] As an optimization, the second driving mechanism is a micrometer lifting assembly that moves along the Z-axis. A fixing plate is fixed to the upper end of the micrometer lifting assembly, and the upper surface of the fixing plate has a placement slot adapted to the FPC flexible board. This optimized solution uses the micrometer lifting assembly to drive the FPC flexible board to move vertically, improving the accuracy of the vertical movement distance and further ensuring the accuracy of the contact height between the probe and the gold fingers of the FPC flexible board. By setting the placement slot for the FPC flexible board, displacement of the FPC flexible board is prevented.

[0013] As an optimization, double-sided micro-adhesive foam is provided between the FPC flexible board and the bottom of the placement groove. The FPC flexible board is fixed to the bottom of the placement groove by the double-sided micro-adhesive foam. This optimized solution uses double-sided micro-adhesive foam to fix the FPC flexible board, which not only has a simple structure and good fixing effect, but also uses the elasticity of the double-sided micro-adhesive foam to act as a buffer, so that the contact between the probe and the gold fingers of the FPC flexible board is a soft contact, avoiding the problems of probe deformation and gold finger damage.

[0014] The beneficial effects of this utility model are as follows: the first driving mechanism and the second driving mechanism respectively realize the precise movement of the probe along the X-axis and the precise movement of the gold finger in the vertical direction, achieving precise positioning and ensuring the contact height of the probe and the gold finger in the vertical direction and their relative position in the horizontal direction; and realize the simultaneous testing of single / multiple probes, improving the efficiency of automated testing; the driving mechanism in the X-axis and Z-axis directions moves precisely, with a simple structure, high feasibility, and low cost. Attached Figure Description

[0015] Figure 1 This is an exploded view of the testing device of this utility model; Figure 2 This is an assembly drawing of the testing device of this utility model; Figure 3 This is a schematic diagram of the probe fixing assembly structure; Figure 4 for Figure 3 Enlarged view of point A in the middle; As shown in the figure: 11. Fixing plate; 112. Placement slot; 12. First drive motor; 13. Base plate; 2. FPC flexible board fixing assembly; 21. PCB circuit board; 22. FPC flexible board; 23. Double-sided micro-adhesive foam; 3. Probe fixing assembly; 31. Fixing top cover; 32. Probe; 33. Fixing seat; 311. Upper contouring slot; 331. Lower contouring slot; 4. First drive mechanism; 41. First limit switch; 42. Moving block; 5. Micrometer lifting assembly; 51. Second limit switch; 52. Support rod. Detailed Implementation

[0016] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to describe the solution.

[0017] like Figure 1 and 2 The device for testing a piezoelectric ceramic nozzle-based flexible printed circuit board (FPC) includes a probe fixing assembly 3 and a first drive mechanism 4 for moving the probe fixing assembly 3 along the X-axis. The probe fixing assembly is used to fix the probe, with the probe's detection end extending to one side. An FPC flexible board fixing assembly 2 is located on the side where the probe's detection end is located, along with a second drive mechanism for moving the FPC flexible board fixing assembly 2 along the Z-axis. The gold fingers of the FPC flexible board 22 fixed by the FPC flexible board fixing assembly correspond to the probe 32 fixed by the probe fixing assembly. During testing, the gold fingers are located directly below the probe's detection end.

[0018] The probe fixing assembly 3 has several mounting slots adapted to the probes. These slots are arranged sequentially along the X-axis, with the spacing between adjacent slots being an integer multiple of the spacing between the gold fingers of the FPC flexible board. One probe is placed in each slot, and multiple probes form a probe array. In this embodiment, the probe array contains five probes. The spacing and number of probes in the array can be freely changed according to requirements; a larger number of probes in the array allows for a larger number of gold fingers to be tested at once.

[0019] The probe fixing assembly 3 includes a fixing base 33 and a fixing cover 31 covering the top surface of the fixing base. The fixing base 33 and the fixing cover 31 are detachably fixed. In this embodiment, the fixing cover and the fixing base are connected by bolts, which is simple in structure and easy to assemble and disassemble. The bottom surface of the fixing cover 31 is provided with an upper contour groove 311, and the top surface of the fixing base 33 is provided with a lower contour groove 331 opposite to the upper contour groove 311. The upper contour groove 311 and the lower contour groove 331 are fastened together to form the mounting groove. The upper contour groove 311 and the lower contour groove 331, which are opposite each other, clamp and fix the probe 32.

[0020] The first drive mechanism 4 employs a lead screw and nut mechanism. Specifically, the first drive mechanism includes two fixed blocks arranged along the X-axis, a movable block 42 located between the two fixed blocks, and a lead screw passing through and threadedly connected to the movable block 42 along the X-axis. One end of the lead screw is rotatably connected to one of the fixed blocks, and the other end passes through the other fixed block and is connected to a first drive motor 12. A guide rod parallel to the lead screw and passing through the movable block is also fixed on the fixed block. The fixing seat 33 of the probe fixing assembly 3 is bolted to the movable block 42. The first drive motor is a servo motor, which drives the lead screw to rotate. The threaded action between the lead screw and the movable block causes the movable block to move along the X-axis. To further improve the accuracy of the moving distance, a ball screw can be used.

[0021] To facilitate the initial positioning of the probe fixing assembly, this embodiment includes a first limit switch 41 fixed on at least one fixed block, which is positioned opposite the moving block along the X-axis. The first limit switch 41 is electrically connected to the first drive motor 12. Preferably, in this embodiment, the first limit switch is installed on the fixed block on the side of the moving block furthest from the first drive motor to detect the initial position of the moving block.

[0022] The second driving mechanism is a micrometer lifting assembly 5 that moves along the Z-axis. A fixing plate 11 is fixed to the upper end of the micrometer lifting assembly 5. The upper surface of the fixing plate 11 has a placement groove 112 adapted to the FPC flexible board 22. Double-sided micro-adhesive foam 23 is provided between the FPC flexible board 22 and the bottom of the placement groove 112, and the FPC flexible board 22 is fixed to the bottom of the placement groove 112 by the double-sided micro-adhesive foam 23. The PCB circuit board 21 connected to the FPC flexible board 22 is fixed to the upper surface of the fixing plate 11. The micrometer lifting assembly 5 is prior art, and its structure will not be described in detail.

[0023] To facilitate control of the height position of the fixed plate 11, this embodiment also provides a second limit switch 51 that is adapted to the extreme position on the fixed plate 11. The second limit switch is installed on the fixed support rod 52, and the second limit switch 51 is electrically connected to the servo drive motor of the micrometer lifting assembly. When the fixed plate moves up to the second limit switch, the servo drive motor of the micrometer lifting assembly stops rotating.

[0024] In this embodiment, both the first and second drive mechanisms are mounted on the base plate 13, and the lower end of the support rod 52 is fixedly connected to the base plate to form an integral structure, which facilitates overall movement.

[0025] In use, the probe 32 moves left and right along the X-axis by rotating the first drive motor in both directions, and the micrometer lifting assembly 5 drives the FPC flexible board on the FPC flexible board fixing assembly 2 to move up and down along the Z-axis. The ball screw lead of the first drive mechanism is 0.8mm, and the accuracy of the micrometer lifting assembly 5 can reach 0.01mm.

[0026] In the specific measurement, firstly, the first drive mechanism 4 and the micrometer lifting assembly 5 operate respectively. The moving block contacts the first limit switch 41, and the fixed plate 11 contacts the second limit switch 51, thus determining the starting origin of the movement. Before the probe 32 moves along the X-axis, the micrometer lifting assembly 5 moves the FPC fixed assembly 2 downward, so that the gold fingers of the FPC flexible board 22 are lower than the detection end of the probe, avoiding contact between the gold fingers and the probe 32 to prevent probe deformation and scratches on the gold fingers. Then, the first drive mechanism precisely moves the probe 32 to the designated position, with the probe and the corresponding gold fingers located on the same plane extending along the Y-axis. The micrometer lifting assembly 5 raises the FPC flexible board 22 to the designated height, and the fixed plate triggers the second limit switch, stopping the micrometer lifting assembly 5 from moving upward. At this point, the probe 32 contacts the gold fingers of the FPC flexible board 22 for testing. Because the double-sided micro-adhesive foam 23 is elastic, it can act as a buffer, making the contact between the probe 32 and the gold fingers of the FPC flexible board 22 a soft contact, avoiding the problems of probe deformation and gold finger damage.

[0027] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A testing device for FPC flexible circuit boards with piezoelectric ceramic nozzles, characterized in that: It includes a probe fixing assembly (3) and a first driving mechanism for driving the probe fixing assembly (3) to move along the X-axis direction. The probe fixing assembly has an FPC flexible board fixing assembly (2) on the side where the probe detection end is located, and a second driving mechanism for driving the FPC flexible board fixing assembly (2) to move along the Z-axis direction. The gold fingers of the FPC flexible board (22) fixed by the FPC flexible board fixing assembly correspond to the probe (32) fixed by the probe fixing assembly.

2. The piezoelectric ceramic nozzle FPC flexible circuit board testing device according to claim 1, characterized in that: The probe fixing assembly (3) is provided with mounting slots that are adapted to the probe. Each mounting slot is arranged sequentially along the X-axis direction, and the distance between two adjacent mounting slots is an integer multiple of the distance between the gold fingers of the FPC flexible board.

3. The piezoelectric ceramic nozzle FPC flexible circuit board testing device according to claim 2, characterized in that: The probe fixing assembly (3) includes a fixing seat (33) and a fixing cover (31) covering the top surface of the fixing seat. The fixing seat (33) and the fixing cover (31) are detachably fixed. The bottom surface of the fixing cover (31) is provided with an upper contour groove (311), and the top surface of the fixing seat (33) is provided with a lower contour groove (331) opposite to the upper contour groove (311). The upper contour groove (311) and the lower contour groove (331) are fastened together to form the mounting groove.

4. The piezoelectric ceramic nozzle FPC flexible circuit board testing device according to claim 1, characterized in that: The first driving mechanism includes two fixed blocks arranged along the X-axis, a movable block (42) located between the two fixed blocks, and a lead screw that passes through the movable block (42) along the X-axis and is threadedly connected to the movable block. One end of the lead screw is rotatably connected to one of the fixed blocks, and the other end of the lead screw passes through the other fixed block and is connected to a first driving motor (12). A guide rod that is parallel to the lead screw and passes through the movable block is also fixed on the fixed block. The probe fixing assembly (3) is installed on the movable block (42).

5. The piezoelectric ceramic nozzle FPC flexible circuit board testing device according to claim 4, characterized in that: At least one fixed block is fixed with a first limit switch (41) that is disposed opposite to the moving block along the X-axis direction. The first limit switch (41) is electrically connected to the first drive motor (12).

6. The piezoelectric ceramic nozzle FPC flexible circuit board testing device according to claim 1, characterized in that: The second driving mechanism is a micrometer lifting assembly (5) that moves up and down along the Z-axis. A fixing plate (11) is fixed at the upper end of the micrometer lifting assembly (5). The upper surface of the fixing plate (11) is provided with a placement groove (112) that is compatible with the FPC flexible board (22).

7. The piezoelectric ceramic nozzle FPC flexible circuit board testing device according to claim 6, characterized in that: Double-sided micro-adhesive foam (23) is provided between the FPC flexible board (22) and the bottom of the placement groove (112), and the FPC flexible board (22) is fixed to the bottom of the placement groove (112) by the double-sided micro-adhesive foam (23).

Images