A jig structure for detecting paste missing of a glue paper

Abstract

The utility model discloses a kind of jigs structures for detecting glue paper missing pasting, it is related to flexible circuit board technical field, to solve the problem of low efficiency of existing detection, high misjudgment rate. It includes jig base, upper die, detection probe group and conduction detection component;Jig base is equipped with clamping groove and conduction point, upper die is equipped with elastic buffer layer and guide hole, and detection probe group is 2-8 elastic dowels. Utilize the non-conductive characteristics of glue paper, missing pasting is judged by the on-off state of probe and conduction point: circuit is open when pasting glue paper, circuit is on when missing pasting, and conduction detection component intuitively displays result. The jig is accurate in positioning, convenient to operate, can avoid product damage, adapt to a variety of specifications products, greatly improve detection efficiency and accuracy, reduce production cost, and strong practicality.

Description

Technical Field

[0001] This utility model relates to the field of flexible circuit board technology, specifically to a fixture structure for detecting missing adhesive tape. Background Technology

[0002] Flexible printed circuit boards (FPCs), as highly reliable and flexible electronic connection components, have been widely used in consumer electronics, medical devices, automotive electronics, and other fields due to their advantages of being thin, flexible, and having high space utilization. During the manufacturing process of FPCs, to achieve functions such as insulation protection, component fixation, and dust and moisture protection, auxiliary adhesive tapes (or other adhesive materials) are typically applied to specific areas. The quality of these adhesive tape applications directly affects the assembly performance of the FPC and the reliability of the final product.

[0003] As electronic products rapidly evolve towards miniaturization, thinness, and high performance, the structural space requirements for FPCs are becoming increasingly stringent, leading to a continuous reduction in the size of the corresponding adhesive tape. Currently, the industry widely adopts micro-adhesive tapes with dimensions of only 0.5mm × 1mm, while requiring an adhesion accuracy of ±0.1mm or higher. However, the miniaturization of tape size and the high standard of adhesion accuracy present numerous challenges to manufacturing: on the one hand, the adhesion process of micro-adhesive tapes is significantly more complex, requiring high-precision adhesion equipment and stringent process parameter control, resulting in increased production costs; on the other hand, the small adhesive contact area of ​​micro-adhesive tapes makes them highly susceptible to detachment due to external friction, collisions, or changes in environmental temperature and humidity during subsequent processes such as FPC turnover, handling, and assembly. Once the tape detaches or is missed, it directly leads to the inability of the FPC to be properly fixed in the end product, causing malfunctions such as poor contact, short circuits, and loose components, severely affecting the performance of the end product.

[0004] In existing technologies, the detection methods for missing or detached FPC adhesive tape mainly include manual inspection and traditional fixture inspection, but both have significant drawbacks. Manual inspection relies on operators visually inspecting the FPC surface for adhesive tape using the naked eye or a magnifying glass. This method is highly susceptible to subjective factors such as operator vision, work fatigue, and sense of responsibility, resulting in high rates of missed detections and false positives. For micro-adhesive tape measuring 0.5mm × 1mm, the missed detection rate of manual inspection can even exceed 30%, and the inspection efficiency is low, only able to inspect 10-20 products per minute, which cannot meet the needs of large-scale mass production. Furthermore, prolonged visual inspection can easily lead to operator eye fatigue, increasing labor costs and management difficulties.

[0005] Traditional fixture-based testing methods suffer from problems such as complex structure, high cost, poor versatility, and insufficient testing accuracy. Some traditional fixtures use optical sensors and image recognition technologies for testing, which, while offering high accuracy, are expensive, with the purchase cost of a single set often exceeding 100,000 yuan. Furthermore, they are difficult to maintain and have stringent environmental requirements, making them unaffordable for small and medium-sized enterprises. Some fixtures employ mechanical contact testing, but lack precise positioning structures, leading to FPC placement deviations, misalignment of probes with adhesive tape attachment areas, and low reliability of test results. Additionally, some fixtures use inappropriate probe materials, easily causing wear or damage to the FPC surface, resulting in a decrease in product pass rate. Moreover, most traditional fixtures can only accommodate a single model or size of FPC; when product models change, fixtures need to be redesigned and manufactured, increasing production investment and product changeover cycles for enterprises.

[0006] Furthermore, current technologies, whether manual inspection or traditional fixture inspection, are insufficient to completely prevent defective products with missing or detached adhesive tape from leaving the factory. Once defective products reach the customer, it leads to assembly halts and rework, increasing production costs and generating customer complaints, thus damaging the company's brand reputation. Industry statistics show that customer complaints due to missing or detached FPC adhesive tape account for over 40% of all FPC product complaints, causing significant economic and reputational losses for companies. Utility Model Content

[0007] The present invention aims to overcome at least one of the defects of the prior art and provide a fixture structure for detecting missing adhesive tape, so as to achieve high detection efficiency.

[0008] This invention provides a fixture structure for detecting missing adhesive tape, comprising a fixture base, an upper mold, a detection probe assembly, and a continuity detection component. The fixture base is used to fix and position the product under test and has a continuity point below the adhesive tape's intended attachment position. The upper mold is responsible for pressing the product to prevent movement. The detection probe assembly is fixed to the inner wall of the upper mold, with its detection end positioned above the adhesive tape's intended attachment position. The continuity detection component detects the continuity status and outputs a result through electrical connection with the probe assembly and the continuity point. This design utilizes the non-conductive property of adhesive tape through a "corresponding upper and lower" continuity detection logic. When the product has missing adhesive tape, the probe and the continuity point form a path, and the continuity detection component outputs a corresponding result; otherwise, it indicates an open circuit. This fundamentally solves the problems of low efficiency and easy misjudgment in traditional manual detection of missing adhesive tape, enabling rapid identification of missing tape and significantly improving detection efficiency and accuracy.

[0009] Furthermore, the fixture base is equipped with a positioning slot for positioning the product to be tested. This slot precisely limits the position of the product, ensuring it remains in the preset testing position when placed on the base. This prevents the testing probe from misaligning with the conductive point due to product misalignment. This design effectively reduces testing errors caused by product displacement, ensuring that every test is based on the same reference position, improving the consistency and reliability of fixture testing, while simplifying the product placement process for operators and reducing operational difficulty.

[0010] Furthermore, the detection probe assembly consists of multiple sets of elastic pins. These elastic pins possess expandable and contractile properties, allowing them to adaptively adjust their extension and contraction based on the actual surface conditions of the product when the upper die of the fixture is pressed down. This ensures stable contact with the product surface, avoiding potential surface damage caused by hard contact between the rigid probe and the product, while also guaranteeing reliable contact between the probe and the product. This prevents signal distortion due to poor contact and ensures the accuracy of continuity test results.

[0011] Furthermore, the number of probes in the detection probe set is 2-8. The limitation on the number of probes is based on actual detection needs. Too few probes may result in blind spots in the area covered by the adhesive tape, making it impossible to comprehensively identify missed applications; too many probes will increase the manufacturing cost and structural complexity of the fixture, and may also lead to redundant detection resources. The 2-8 probe design can cover the detection needs of different sizes of adhesive tape, ensuring no blind spots in detection, while also taking into account the economy and structural simplicity of the fixture, adapting to detection scenarios for various product specifications.

[0012] Furthermore, the probe assembly includes a fixing block, a spring, and a pin. The fixing block is movably connected to the upper mold, and the top of the pin is fixed to the upper mold. The movably connected fixing block, in conjunction with the spring structure, allows the pin to extend and retract flexibly, further improving the fit between the probe and the product surface. Even with slight unevenness on the product surface, stable contact can be ensured. At the same time, the movable connection design facilitates subsequent disassembly, maintenance, or replacement of the elastic pin, reducing the maintenance cost of the fixture and extending its overall service life.

[0013] This invention incorporates a metal sheet positioned below the adhesive tape's intended attachment point. As a conductive medium, the metal sheet significantly enhances the conductivity of the continuity point, reduces contact resistance between the probe and the continuity point, and makes the signal transmission of the continuity detection circuit more sensitive. This design effectively avoids detection errors caused by poor conductivity at the continuity point, ensuring accurate identification even for minute contact differences, further improving the accuracy of missed attachment detection. This invention explicitly uses a copper sheet for the continuity point. Copper possesses excellent conductivity and chemical stability, is not easily oxidized or rusted, and maintains stable conductivity over a long period, preventing a decline in conductivity due to oxidation and ensuring high detection accuracy even after long-term use. Furthermore, copper offers high cost-effectiveness; compared to other highly conductive metals, it reduces the manufacturing cost of the fixture while maintaining performance, balancing practicality and economy.

[0014] Furthermore, the continuity detection component includes a power module, a detection circuit, and a display module, all of which are electrically connected sequentially. The display module provides feedback on the continuity or non-conductivity status. The power module provides stable power support for the detection process, the detection circuit processes the continuity signals between the probe group and the continuity point, and the display module presents the detection results in a visually intuitive manner. This modular design significantly automates the detection process, allowing operators to quickly determine whether adhesive tape has been missed without complex judgments. This reduces the difficulty of manual operation and the probability of misjudgment, while also improving the standardization and efficiency of the detection process.

[0015] This invention further specifies that the bottom of the upper mold is provided with a 0.5-1mm thick elastic buffer layer made of silicone. Silicone material possesses good elasticity and softness; the 0.5-1mm thickness ensures a buffering effect without affecting the stability of the upper mold's pressure on the product. The elastic buffer layer can cushion the impact force generated when the upper mold presses down, preventing scratches or damage to the product surface due to excessive pressure. Simultaneously, the softness of the buffer layer allows it to better conform to the product surface, enhancing the friction between the upper mold and the product, further preventing product movement during testing, and improving the stability and reliability of the testing.

[0016] Furthermore, a guide post and a matching guide hole are provided between the upper mold and the fixture base, and the guide post is fixed to the fixture base. The cooperation between the guide post and the guide hole guides the upper mold to always move along a preset trajectory during its up and down movement, ensuring that the upper mold is accurately aligned with the fixture base when it is pressed down, avoiding misalignment of the detection probe and the conduction point due to upper mold offset, and ensuring the accuracy of the detection position. This design improves the overall structural stability of the fixture, reduces detection errors caused by assembly deviations or improper operation, and makes the opening and closing operation of the upper mold smoother, improving the convenience of operation.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This utility model's adhesive tape mis-application detection fixture integrates multiple functional characteristics such as precise positioning, elastic contact, sensitive continuity detection, buffer protection, and guiding alignment through a rational structural design. The coordinated operation of all components enables rapid and accurate detection of adhesive tape mis-application, effectively solving the problems of low efficiency, high false positive rate, and easy product damage associated with traditional manual inspection. The fixture is adaptable to various product specifications, easy to operate, and has low maintenance costs. It can significantly improve inspection efficiency in the production process, reduce the flow of products with mis-application tape into subsequent stages, lower production losses and labor costs, and possesses strong practicality and promotional value. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating the structural principle of the fixture for detecting missing adhesive tape according to this utility model.

[0020] Figure 2 This is a side view of the fixture structure for detecting missing adhesive tape according to this utility model.

[0021] Figure 3 This is a schematic diagram of the fixture base structure of the fixture structure of this utility model.

[0022] Figure 4 This is a schematic diagram of the upper mold structure of the fixture structure of this utility model.

[0023] Figure 5 This is a schematic diagram of the elastic pin structure of the fixture of this utility model. Detailed Implementation

[0024] The accompanying drawings illustrate the technical solutions of this utility model in more detail. Throughout the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The described embodiments are only some, not all, of the embodiments of this utility model. 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. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0025] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application. Example

[0027] like Figure 1 As shown, the detection fixture for missing adhesive tape 200 in this embodiment is used for detecting adhesive tape 200 on FPC100; combined with Figure 2 As shown, it includes a fixture base 1, an upper mold 2, a detection probe group 3, and a continuity detection component 4; as Figure 3 As shown, the fixture base 1 is provided with a strip-shaped slot 11, a copper sheet 12, and a guide post 13; combined with Figure 4 As shown, the upper mold 2 is provided with a guide hole 21 and an elastic buffer layer 22. The detection probe group 3 consists of three elastic pins, each of which includes a fixing block 31, a spring 32, and a pin component 33; the continuity detection component 4 integrates a power module, a detection circuit, and a display module, and can be a tool for detecting circuit loops in the prior art.

[0028] The fixture base 1 is a rectangular platform located at the bottom of the fixture, serving as the supporting foundation for the overall structure. A strip-shaped slot 11 is formed at the center of its top. The slot's dimensions are adapted to common products being tested, precisely defining the product's placement and preventing displacement. A copper sheet 12 is fixed to the bottom of the slot 11, corresponding to the area where the product adhesive tape 200 should be attached. The surface of the copper sheet 12 is flush with the bottom of the slot, enhancing the conductivity of the conductive points and ensuring stable transmission of the test signal. Four cylindrical guide posts 13 are vertically fixed at the four corners of the fixture base 1. The guide posts 13 have smooth surfaces, providing a guiding reference for the movement of the upper mold 2.

[0029] The upper mold 2 is a rectangular cover that matches the fixture base 1 and is located directly above the fixture base 1. Guide holes 21 are provided at the four corners of the upper mold 2 corresponding to the guide posts 13. The guide holes 21 are fitted with the guide posts 13 with a clearance fit. The upper mold 2 is fitted onto the guide posts 13 through the guide holes 21 and can move smoothly up and down along the guide posts 13. An elastic buffer layer 22 is fully covered on the bottom of the upper mold 2. This buffer layer is made of silicone and has a thickness of 0.8 mm. It can both buffer the impact force when the upper mold 2 is pressed down, preventing scratches on the product surface, and enhance the fit between the upper mold 2 and the product, improving the pressing stability. The inner wall of the upper mold 2 has a probe mounting groove in the area corresponding to the strip groove 11. Three elastic pins are evenly arranged in a linear row in the mounting groove. The fixing block 31 of the elastic pin is movably engaged with the mounting groove. The spring 32 is embedded in the fixing block 31. The top of the pin 33 is fixed to the upper mold 2, and the bottom passes through the elastic buffer layer 22 and extends out by 1.5 mm. The elastic force of the spring 32 can make the pin 33 adaptively conform to the product surface to ensure reliable contact.

[0030] The continuity detection component 4 can be assembled into the fixture base 1. Its internal power module provides stable power to the entire detection circuit, the detection circuit processes the continuity signal, and the two LED indicators of the display module are exposed on the surface of the housing for intuitive feedback of the detection results. The continuity detection component 4 is connected to the wiring terminals on the side of the upper mold 2 and the wiring holes on the side of the fixture base 1 via two wires. The wiring terminals of the upper mold 2 are electrically connected to the detection probe group 3, and the wiring holes of the fixture base 1 are electrically connected to the copper sheet 12, forming a complete detection circuit.

[0031] This fixture utilizes the non-conductive physical property of the adhesive tape 200 to determine whether the product has missing adhesive tape 200 by detecting the continuity between the probe group 3 and the copper sheet 12. When the product is placed in the strip slot 11 and has adhesive tape 200 applied, after the upper mold 2 is pressed down, the pin 33 of the probe group 3 contacts the adhesive tape 200 on the product surface. The adhesive tape 200 blocks the circuit between the probe group and the copper sheet 12, and the detection circuit of the continuity detection component 4 does not detect a continuity signal. The indicator light corresponding to "non-conductivity" in the display module lights up, indicating that the adhesive tape 200 is properly applied. When the product has missing adhesive tape 200, after the upper mold 2 is pressed down, the pin 33 directly contacts the product surface. Since the product itself has a certain degree of conductivity or forms a path with the copper sheet 12, a conductive loop is formed between the probe group and the copper sheet 12. The detection circuit detects a continuity signal, and the indicator light corresponding to "conductivity" in the display module lights up, indicating that the product has a problem with missing adhesive tape 200.

[0032] Turn on the power to the continuity detection component 4 and check if the indicator lights on the display module are initialized correctly to ensure the equipment is in working condition. Place the product to be tested smoothly into the strip slot 11 of the fixture base 1, and adjust the product position so that the area where the adhesive tape 200 should be attached precisely aligns with the copper sheet 12 at the bottom of the slot. Hold both sides of the upper mold 2 and slowly press it down, aligning it with the guide post 13, until the elastic buffer layer 22 is completely attached to the product surface. At this point, the pins 33 of the detection probe group 3 are in close contact with the product surface under the action of the spring 32. Observe the display module of the continuity detection component 4. If the "non-conductivity" indicator light is on, it means the adhesive tape 200 is properly attached without any omissions; if the "conductivity" indicator light is on, it means there are omissions in the adhesive tape 200, and the product needs to be removed and repaired. After the test is completed, lift the upper mold 2 upwards and remove the product from the strip slot 11 to proceed with the next product test.

[0033] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to the preferred embodiments above, those skilled in the art should understand that modifications or equivalent substitutions to the technical solution of this utility model should not depart from the spirit and scope of this utility model. Those skilled in the art can also make other changes within the spirit of this utility model for its design, as long as they do not deviate from the technical effect of this utility model. These changes made according to the spirit of this utility model should all be included within the scope of protection claimed by this utility model.

Claims

1. A fixture structure for detecting missing adhesive tape, characterized in that, It includes a fixture base (1), an upper mold (2), a detection probe group (3), and a continuity detection component (4); The fixture base (1) is used to fix and position the product to be tested. The fixture base (1) is provided with a conductive point; the conductive point is located below the position where the product adhesive tape (200) should be attached. The upper mold (2) is used to press the product stably onto the fixture base (1) to ensure that the product does not move during the testing process; The detection probe group (3) is fixed to the inner wall of the upper mold (2), and the detection end of the detection probe group (3) is located above the position where the product adhesive tape (200) should be attached. The continuity detection component (4) is electrically connected to the detection probe group (3) and the continuity site respectively, and is used to detect the continuity status between the probe and the continuity site and output the detection result.

2. The fixture structure according to claim 1, characterized in that, The fixture base (1) is provided with a slot for positioning the product to be tested.

3. The fixture structure according to claim 1, characterized in that, The detection probe group (3) includes multiple sets of elastic pins.

4. The fixture structure according to claim 1, characterized in that, The number of probes in the detection probe group (3) is 2-8.

5. The fixture structure according to claim 3, characterized in that, The elastic pin includes a fixing block (31), a spring (32), and a pin component (33); the fixing block (31) is movably connected to the upper mold (2); the top of the pin component (33) is fixed to the upper mold (2).

6. The fixture structure according to claim 1, characterized in that, A metal sheet is provided on the conductive point; the metal sheet is located below the position where the product adhesive tape (200) should be attached.

7. The fixture structure according to claim 6, characterized in that, The metal sheet is a copper sheet (12).

8. The fixture structure according to claim 7, characterized in that, The continuity detection component (4) includes a power module, a detection circuit and a display module. The detection circuit is electrically connected to the power module, the display module, the detection probe group (3) and the copper sheet (12) respectively. The display module is used to display the continuity or non-conduction state.

9. The fixture structure according to claim 1, characterized in that, The bottom of the upper mold (2) is provided with an elastic buffer layer (22), which is made of silicone and has a thickness of 0.5-1mm.

10. The fixture structure according to claim 1, characterized in that, A guide post (13) is provided between the upper mold (2) and the fixture base (1). The guide post (13) is fixed to the fixture base (1). The upper mold (2) is provided with a guide hole (21) that matches the guide post (13).

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