Inspection structure for preventing FPC (Flexible Printed Circuit) appearance from deviating
By designing the inspection part of the calibration block in the punching structure of the FPC product, the position of the hedging tangent is quickly compared, and the problem of conductive line cutting caused by the outward deviation of the FPC product is solved, achieving rapid inspection and quality control.
Patent Information
- Application Number
- CN202421337469.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-06-12
AI Technical Summary
During the punching and cutting process of FPC products, due to machine alignment deviation and raw material tolerance, the appearance of the FPC product is deviated, which in turn causes cutting or damage to the conductive lines, and it is difficult to quickly detect the damage location, resulting in poor functional products flowing to the client.
A test structure that prevents FPC appearance bias is designed, including a FPC large plate and an inspection part. The inspection part consists of two calibration blocks. The distance between the outer edge of the FPC monomer and the conductive line is greater than one-half of the distance between the calibration blocks. After punching and cutting, the position of the hedging tangent is between the calibration blocks to quickly verify the FPC appearance bias.
By quickly comparing the position of the hedging tangent, it can be determined whether there is a local fluctuation deviation in the FPC monomer, thereby preventing the flow of FPC products from cutting the conductive line to the client, ensuring product quality.
Smart Images
Figure CN222776368U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of flexible circuit boards, in particular to a testing structure for preventing an FPC from being offset. Background Art
[0002] Flexible circuit board, abbreviated as FPC in English, is a printed circuit made of polyester film (PET) or polyimide (PI) as the substrate, which is made by etching the circuit on copper foil.
[0003] Generally, a safety distance is set between the outermost circuit of the FPC and the outer edge of the FPC to prevent the circuit from being cut when the FPC large board is punched. The above safety distance is determined based on the alignment deviation of the existing machine and the tolerance of the FPC product appearance. However, due to the customer's requirements for the FPC appearance, the design value of the actual FPC product (i.e. the minimum distance between the outermost circuit of the FPC and the outer edge of the FPC) is smaller than the above safety distance. For example, if the safety distance is 0.2mm, the design value of the actual FPC product is only 0.15mm. Moreover, when the FPC product is long and narrow or its length is long, the middle section is prone to deviation and cutting of the local circuit when punching the FPC large board due to the alignment deviation of the machine and the tolerance of the raw materials, resulting in circuit cutting or damage. Moreover, it is not easy for the operator to detect the corresponding circuit cutting or damage position, resulting in the flow of defective products to the client and complaints. Utility Model Content
[0004] Therefore, in order to solve the above problems, the utility model provides an inspection structure for preventing FPC shape deviation, which is used to quickly inspect FPC products with FPC shape deviation to avoid FPC products with cut conductive circuits from flowing to customers.
[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:
[0006] The utility model provides an inspection structure for preventing an FPC from being offset from its outer shape, comprising an FPC large board, wherein the FPC large board comprises an FPC monomer and a waste area around the FPC monomer, wherein the waste area is provided with an inspection part for comparing punching line spacing, and the inspection part comprises a calibration block arranged with a spacing; the distance between the outer edge of the FPC monomer and the conductive circuit adjacent thereto is greater than half of the distance between adjacent calibration blocks; after the FPC large board is punched, punching lines are formed between adjacent calibration blocks; and the punching positions of the punching lines between adjacent calibration blocks are compared to form a rapid inspection arrangement for the FPC outer shape offset.
[0007] Furthermore, the number of calibration blocks is 2; the distance between the outer edge of the FPC unit and the conductive circuit adjacent thereto is 0.2 mm, and the distance between the two calibration blocks is 0.3 mm.
[0008] Furthermore, the calibration block is a copper block formed by etching the FPC large board.
[0009] Furthermore, the FPC large board is provided with a covering film window area cooperating with the inspection part, and the inspection part is arranged in the covering film window area.
[0010] Furthermore, the distance between the boundary of the window area of the covering film and the boundary of the inspection part is at least 0.2 mm.
[0011] Furthermore, the length of the FPC unit is greater than its width.
[0012] Furthermore, the inspection portion corresponds to the middle portion of the FPC monomer.
[0013] The technical solution provided by the utility model has the following beneficial effects:
[0014] The distance between the outer edge of the FPC monomer and the adjacent conductive circuit is greater than half of the distance between adjacent calibration blocks. After punching the FPC large board, the operator compares the punching position of the punching line formed by punching the FPC large board between the adjacent calibration blocks to quickly determine whether the actual position of the punching line is within the area where one of the calibration blocks is located, and then indirectly determine whether the FPC shape has local deviation during punching, so as to quickly detect FPC products or FPC monomers with deviation in shape, so as to avoid FPC products with damaged conductive circuits from flowing to customers. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 The figure is a partial schematic diagram of the inspection structure for preventing the FPC shape from being offset in the embodiment;
[0016] Figure 2 Shown Figure 2 A magnified schematic diagram of area A in the middle;
[0017] Figure 3 Shown is a schematic diagram of an anti-FPC large board in an embodiment. DETAILED DESCRIPTION
[0018] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.
[0019] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.
[0020] Reference Figures 1 to 3 As shown, this embodiment provides a test structure for preventing the FPC from being offset (hereinafter referred to as the test structure), the test structure includes a large FPC board, such as Figure 3 The FPC board shown in the figure includes an FPC monomer 1 and a waste area 2 located around the FPC monomer 1. The waste area 2 is provided with a testing part 3 for comparing the punching line distance. Figure 1 The inspection unit 3 shown includes the following Figure 2 The two calibration blocks shown are arranged at intervals and are respectively the first calibration block 31 and the second calibration block 32 . The distance between the outer edge of the FPC unit 1 and the conductive line adjacent thereto is greater than half of the distance between the adjacent first calibration block 31 and the second calibration block 32 .
[0021] After the FPC board is punched, a punching line 4 is formed between the first calibration block 31 and the second calibration block 32. The punching position of the punching line 4 between the first calibration block 31 and the second calibration block 32 is compared to form a quick inspection setting for the FPC shape deviation.
[0022] In this embodiment, the length of the FPC monomer 1 is greater than its width, that is, the FPC monomer 1 is long and narrow, and the inspection part 3 corresponds to the middle part of the FPC monomer 1, so that the inspection part 3 can be set on the side of the long side of the FPC monomer 1 where deviation is prone to occur, thereby strengthening the control of defects such as cuts on the conductive circuits of the FPC monomer 1.
[0023] The distance between the outer edge of the FPC monomer 1 and the adjacent conductive circuit is greater than half of the distance between the first calibration block 31 and the second calibration block 32. After punching the FPC large board, the operator compares the punching position of the punching line 4 formed by punching the FPC large board between the first calibration block 31 and the second calibration block 32 to quickly determine whether the actual position of the punching line 4 is within the area where the first calibration block 31 or the second calibration block 32 is located, and then indirectly determine whether the shape of the FPC monomer 1 is locally deviated during punching, so as to quickly detect FPC products or FPC monomers 1 with deviated shapes, so as to avoid FPC products with damaged conductive circuits from flowing to customers.
[0024] Of course, in other embodiments, the number of calibration blocks can also be 3, 4 or 5 or more, such as 3 standard blocks arranged in a pin shape, or 4 calibration blocks arranged in a field shape, etc., so that the corresponding punching line distances can be compared.
[0025] In another preferred embodiment, the distance L1 between the outer edge of the FPC unit 1 and the conductive circuit adjacent thereto is 0.2 mm, and the distance L2 between the first calibration block 31 and the second calibration block 32 is 0.3 mm.
[0026] In specific implementation, the first calibration block 31 and the second calibration block 32 are both copper blocks formed by etching the FPC large board, and due to the high dimensional accuracy of the etching process, the dimensional tolerance of the first calibration block 31 and the second calibration block 32 is small and does not affect the comparison of the punching line spacing.
[0027] After the FPC board is punched and the punching line 4 is located at the center line between the first calibration block 31 and the second calibration block 32, the distance L1 between the outer edge of the punched FPC unit 1 and the adjacent conductive circuit is actually 0.2 mm, and the corresponding punching deviation is zero.
[0028] After the FPC board is punched and the punching line 4 is located on the outer edge of the first calibration block 31 or the second calibration block 32, the distance L1 between the outer edge of the punched FPC monomer 1 and the adjacent conductive circuit is actually 0.05mm, and the corresponding punching deviation is 0.15mm. At this time, the corresponding FPC monomer 1 has the risk of cutting the conductive circuit and needs to be intercepted separately and further investigated.
[0029] After the FPC board is punched and the punching line 4 is located in the area where the first calibration block 31 or the second calibration block 32 is located, the distance L1 between the outer edge of the punched FPC monomer 1 and the conductive circuit adjacent to it is actually close to zero or the conductive circuit of the FPC monomer 1 has been cut. At this time, the FPC monomer 1 is quickly judged as a functional defective product to avoid the FPC product with cut conductive circuits from continuing to flow to the customer.
[0030] Of course, in other embodiments, the first calibration block 31 and the second calibration block 32 may also be made of other materials of the FPC board.
[0031] In another preferred embodiment, the FPC board is provided with a covering film window area 5 matching the inspection part 3, and the inspection part 3 is arranged in the covering film window area 5 to facilitate the operator to observe the position of the punching line 4 on the inspection part 3 more intuitively and clearly.
[0032] In this specific embodiment, the copper layer of the FPC board is first etched to form the conductive circuit of the FPC unit 1 and the copper block of the inspection part 3, and then a covering film is covered on the copper layer on the same layer as the copper block of the inspection part 3. Prior to this, the covering film is preliminarily provided with a covering film window area 5, and then the covering film window area 5 is aligned with the inspection part 3, and then the covering film is pasted to form the FPC board with the inspection part 3 in the covering film window area 5, and the spacing L3 between the boundary of the covering film window area 5 and the boundary of the inspection part 3 is at least 0.2 mm to ensure that the covering film will not cover part of the copper block of the inspection part 3, thereby avoiding interference with the operator's offset inspection.
[0033] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.
Claims
1. An inspection structure for preventing an FPC from being deflected, comprising an FPC board, wherein the FPC board comprises an FPC unit and a waste area around the FPC unit, wherein: The waste area is provided with an inspection part for comparing the punching line spacing, and the inspection part includes calibration blocks arranged at intervals; the distance between the outer edge of the FPC monomer and the conductive line adjacent thereto is greater than half of the distance between adjacent calibration blocks; After the FPC large board is punched, punching lines are formed between adjacent calibration blocks; Compare the punching positions of the punching lines between adjacent calibration blocks to form a quick inspection setting for FPC shape deviation.
2. The inspection structure for preventing the FPC from being deflected according to claim 1, characterized in that: The number of calibration blocks is 2; the distance between the outer edge of the FPC unit and the conductive circuit adjacent thereto is 0.2 mm, and the distance between the two calibration blocks is 0.3 mm.
3. The inspection structure for preventing the FPC shape from deflecting according to claim 1, characterized in that: The calibration block is a copper block formed by etching the FPC large board.
4. The inspection structure for preventing the FPC from deflecting according to any one of claims 1 to 3, characterized in that: The FPC large board is provided with a covering film window area cooperating with the inspection part, and the inspection part is arranged in the covering film window area.
5. The inspection structure for preventing the FPC from being deflected according to claim 4, characterized in that: The distance between the boundary of the window area of the covering film and the boundary of the inspection part is at least 0.2 mm.
6. The inspection structure for preventing the FPC from deflecting according to any one of claims 1 to 3, characterized in that: The length of the FPC unit is greater than its width.
7. The inspection structure for preventing the FPC from being deflected according to claim 6, characterized in that: The inspection portion corresponds to a middle portion of the FPC unit.