FPC (Flexible Printed Circuit) capable of preventing golden finger from warping

Abstract

The utility model discloses an FPC (Flexible Printed Circuit) for preventing golden fingers from warping, which relates to the field of FPC flexible circuit boards and comprises a base material and a plurality of golden fingers arranged on the base material side by side, the front ends of the golden fingers are provided with protective layers, and the protective layers cover the golden fingers and the base material; the protective layer covers the front end of the golden finger, so that the front end of the golden finger is prevented from being directly exposed, the protective layer can protect the front end of the golden finger, so that the front end of the golden finger is prevented from being scratched by the connector, the front end of the golden finger is effectively prevented from warping and losing efficacy, and the protective layer also can enhance the connection strength between the front end of the golden finger and the base material; when the switching FPC is circularly plugged with the connector for multiple times, the front end of the golden finger can be prevented from warping, the service life of the switching FPC is prolonged, the test cost is reduced, and the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of FPC flexible circuit boards, in particular to an FPC capable of preventing gold fingers from warping. Background Art

[0002] FPC refers to "Flexible Printed Circuit". A flexible printed circuit board is a circuit board made of flexible insulating material. It can be bent and folded, and is suitable for applications with limited space or requiring a curved shape. A gold finger refers to the metal contact area of ​​a connector in an FPC. The gold finger is made of metal material and arranged on one side of the FPC to ensure the correct connection of the FPC. Patent application number CN201521077121.2 discloses a gold finger of an FPC, which includes a plurality of gold finger pieces arranged in parallel, the width of the end of the gold finger piece is less than the width of the gold finger piece body, and the gold surface area of ​​the end of the gold finger piece in contact with the punching die is reduced as much as possible, and the force area of ​​the gold surface of the end of the gold finger piece during the punching process is reduced. By improving the gold finger structure, the gold finger end is effectively prevented from warping during the punching process; Patent application number CN201921942372.0 discloses an FPC that can prevent the gold finger from warping during punching, which includes: a substrate, a plurality of gold fingers A arranged side by side on the front of the substrate, and a covering film A and a covering film B covering the front and back of the substrate, so that The covering film A is provided with a square avoidance through hole A for avoiding the gold finger A, and the square avoidance through hole A includes a front side A, a rear side A, a left side A, and a right side A. The spacing between the left side A and the left side of the leftmost gold finger A on the substrate is d1, wherein 0.25mm≤d1≤0.35mm, the spacing between the right side A and the right side of the rightmost gold finger A on the substrate is d2, wherein 0.25mm≤d2≤0.35mm, the spacing between the front side A and the front end of the gold finger A of the substrate is d3, wherein 0.15mm≤d3≤0.25mm, and the spacing between the rear side A and the front side A is d4, wherein 2mm≤d4≤3mm. By setting covering films on the front and back sides and avoiding the gold fingers on both sides, the areas without gold fingers are protected, ensuring the relative consistency of the overall thickness of the FPC, improving the hardness of the FPC, ensuring the overall flatness when punching the FPC, and protecting the FPC from deformation of the welding area during welding.

[0003] At present, the transfer FPC used in the module lighting fixture adopts a ZIF connector to plug the gold finger of the FPC, and then connects it to the test board. Since the transfer FPC is recycled, it needs to be plugged in and out many times. The current design of the ZIF plug-in finger directly removes the PI film at the front end to completely expose the gold finger. This causes the gold finger to be scratched by the connector after multiple plugging and unplugging, resulting in the problem of warping and failure. The above two methods of preventing the deformation and warping of the FPC gold finger are both in the processing stage, and no precautions are taken for the situation where the gold finger of the FPC that has been processed is warped during use. In order to solve the above problems, the utility model discloses an FPC that prevents the gold finger from warping. Utility Model Content

[0004] Based on this, it is necessary to provide an FPC that prevents the gold finger from warping in response to the above technical problems. A protective layer is covered on the front end of the gold finger to prevent the front end of the gold finger from being directly exposed. The protective layer can protect the front end of the gold finger so that the front end of the gold finger will not be scratched by the connector, effectively preventing the gold finger from warping and failing. At the same time, the protective layer can also strengthen the connection strength between the front end of the gold finger and the substrate. When the transfer FPC is plugged and unplugged from the connector repeatedly, the front end of the gold finger can be prevented from warping, thereby increasing the service life of the transfer FPC, reducing testing costs, and improving testing efficiency.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] An FPC for preventing gold fingers from warping comprises a substrate and a plurality of gold fingers arranged side by side on the substrate, wherein a protective layer is arranged at the front end of the gold fingers, and the protective layer covers the gold fingers and the substrate.

[0007] As a preferred implementation of the FPC for preventing the gold finger from warping provided by the utility model, one side edge of the protective layer is flush with the front end edge of the substrate.

[0008] As a preferred implementation of the FPC for preventing the gold finger from warping provided by the utility model, the width of the protective layer is 1.2-1.5 times the width of the gold finger.

[0009] As a preferred implementation of the FPC for preventing the gold finger from warping provided by the utility model, the protective layer is an integral structure or a segmented structure.

[0010] As a preferred implementation of the FPC for preventing the gold finger from warping provided by the utility model, the thickness of the protective layer is 0.005mm-0.0125mm.

[0011] As a preferred implementation of the FPC for preventing the gold finger from warping provided by the utility model, the protective layer is a PI covering film.

[0012] As a preferred implementation of the FPC for preventing the gold finger from warping provided by the utility model, the protective layer is an anti-scratch layer.

[0013] As a preferred implementation of the FPC for preventing the gold finger from warping provided by the utility model, the anti-scratch layer is a green oil layer or a glue layer.

[0014] As a preferred implementation of the FPC for preventing the gold finger from warping provided by the utility model, a snap-fitting through hole is provided on the substrate.

[0015] As a preferred implementation of the FPC for preventing the gold finger from warping provided by the utility model, the number of the buckle fixing through holes is two and they are distributed on both sides of the substrate.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The FPC for preventing the gold finger from warping provided by the utility model covers the front end of the gold finger with a protective layer to prevent the front end of the gold finger from being directly exposed. The protective layer can protect the front end of the gold finger so that the front end of the gold finger will not be scratched by the connector, effectively preventing the front end of the gold finger from warping and failing. At the same time, the protective layer can also strengthen the connection strength between the front end of the gold finger and the substrate. When the transfer FPC is repeatedly plugged and unplugged from the connector, the front end of the gold finger can be prevented from warping, thereby increasing the service life of the transfer FPC, reducing the test cost, and improving the test efficiency.

[0018] 2. The utility model provides an FPC that prevents the gold finger from curling up. A snap-fitting through hole is arranged on the base material of the FPC. After the FPC is inserted into the connector, the snap-fit ​​limiting cylinder on the connector is snapped into the snap-fitting through hole to limit the FPC, so that the gold finger is more firmly connected after being inserted into the connector, avoiding the FPC from being pulled out during the test, resulting in electrical connection failure, and ensuring that the test can be completed smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the first structure of an FPC for preventing the gold finger from warping provided by the utility model;

[0021] Figure 2A second structural schematic diagram of an FPC for preventing the gold finger from warping provided by the utility model;

[0022] Figure 3 A third structural schematic diagram of an FPC for preventing the gold finger from warping provided by the utility model;

[0023] Figure 4 The utility model is a side view of an FPC for preventing the gold finger from warping.

[0024] The markings in the figure are as follows:

[0025] 1. Base material; 2. Gold finger; 3. Protective layer; 4. Snap-on fixing through hole; 5. Reinforcement plate. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0027] As mentioned in the background technology, the current design of ZIF plug fingers directly removes the PI film at the front end to completely expose the gold fingers, which causes the gold fingers to be scratched by the connector after multiple plugging and unplugging, resulting in warping and failure. The existing methods to prevent the deformation and warping of FPC gold fingers are all in the processing stage, and there is no prevention for the situation where the gold fingers of the processed FPC are warped during use.

[0028] In order to solve this technical problem, the utility model provides an FPC for preventing gold fingers from warping, which is applied to the field of FPC flexible circuit boards.

[0029] Specifically, please refer to Figure 1-4 The FPC for preventing the gold finger from warping specifically includes a substrate 1 and a plurality of gold fingers 2 arranged side by side on the substrate 1, a protective layer 3 is arranged at the front end of the gold fingers 2, and the protective layer 3 covers the gold fingers 2 and the substrate 1.

[0030] The FPC for preventing the gold finger 2 from warping provided by the utility model covers the front end of the gold finger 2 with a protective layer 3 to prevent the front end of the gold finger 2 from being directly exposed. The protective layer 3 can protect the front end of the gold finger 2, so that the front end of the gold finger 2 will not be scratched by the connector, effectively preventing the front end of the gold finger 2 from warping and failing. At the same time, the protective layer 3 can also strengthen the connection strength between the front end of the gold finger 2 and the substrate 1. When the transfer FPC is repeatedly plugged and unplugged from the connector, the front end of the gold finger 2 can be prevented from warping, thereby increasing the service life of the transfer FPC, reducing the test cost, and improving the test efficiency.

[0031] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] Example 1

[0035] Please refer to Figure 1-4 , an FPC for preventing the gold finger 2 from warping is provided, which includes a substrate 1 and a plurality of gold fingers 2 arranged side by side on the substrate 1, the substrate 1 is a composite material of an outer conductive aluminum foil and PET, the gold fingers 2 are arranged in two rows, four gold fingers 2 are arranged in each row, and the spacing between the gold fingers 2 in each row is 0.45-0.55mm, and a reinforcing plate 5 is arranged on the back side of the substrate 1 located at the gold finger 2. A protective layer 3 is arranged at the front end of the gold finger 2, and the protective layer 3 covers the gold finger 2 and the substrate 1. The protective layer 3 protects the front end of the gold finger 2, and prevents the gold finger 2 from being scratched during the plugging and unplugging of the FPC and the connector, thereby preventing the front end of the gold finger 2 from warping, thereby increasing the service life of the transfer FPC, reducing the test cost, and improving the test efficiency.

[0036] In the structural design of the protective layer 3, one side of the protective layer 3 is flush with the front edge of the substrate 1, so that the protective layer 3 can completely cover the front end of the gold finger 2, and can also provide a certain degree of protection for the front end of the substrate 1 layer, and in order to reduce the impact of the protective layer 3 on the electrical connection, the width of the protective layer 3 needs to be as narrow as possible, and it also needs to play a protective role. For this reason, in this example, the width of the protective layer 3 is 1.2-1.5 times the width of the gold finger 2. On the other hand, the thickness of the protective layer 3 should not be too thick, which will also affect the electrical contact of the gold finger 2. Therefore, the thickness of the protective layer 3 is set to 0.005mm-0.0125mm, and 0.075mm is preferably used in this example.

[0037] In terms of the material selection of the protective layer 3, the main purpose of the protective layer 3 is to prevent the front end of the gold finger 2 from being scratched by the connector, so any material that can prevent scratches can be used. Preferably, the protective layer 3 is a PI covering film, or it can be a smear-type anti-scratch layer, such as a green oil layer or a glue layer, and the scratch-resistant protective layer 3 is made of green oil and wear-resistant glue.

[0038] Example 2

[0039] The FPC for preventing the gold finger 2 from warping provided in Example 1 is further optimized, specifically, as follows: Figure 1-3 As shown, the protective layer 3 is an integral structure or a segmented structure.

[0040] When the protective layer 3 is a PI covering film, a whole piece structure can be used to directly cover the gold fingers 2 and the substrate 1. Of course, two rows of gold fingers 2 can be covered with a single piece of PI covering film.

[0041] When the protective layer 3 is a smear-type anti-scratch layer, it can be smeared to cover the gold finger 2 and the substrate 1 as a whole, or it can be spot-smeared to only coat the gold finger 2 and the substrate 1 on both sides of the gold finger 2 .

[0042] Example 3

[0043] The FPC for preventing the gold finger 2 from warping provided in Example 2 is further optimized, specifically, as follows: Figure 1-3 As shown, the substrate 1 is provided with a snap-fit ​​through hole 4, and the snap-fit ​​through holes 4 are arranged in two and distributed on both sides of the substrate 1. The two snap-fit ​​through holes 4 can be arranged symmetrically or asymmetrically, and the sizes of the snap-fit ​​through holes 4 can be the same, or one large and one small. After the FPC is inserted into the connector, the snap-fit ​​limiting cylinder on the connector is buckled into the snap-fit ​​fixing through hole 4 to complete the limiting of the FPC, so that the gold finger 2 is more firmly connected after being inserted into the connector, avoiding the FPC being pulled out during the test, resulting in failure of the electrical connection, and ensuring that the test can be completed smoothly.

[0044] The working principle of the FPC for preventing the gold finger 2 from warping provided by the utility model is as follows: the front end of the gold finger 2 is covered with a protective layer 3 to prevent the front end of the gold finger 2 from being directly exposed, the protective layer 3 can protect the front end of the gold finger 2, so that the front end of the gold finger 2 will not be scratched by the connector, effectively preventing the front end of the gold finger 2 from warping and failing, and at the same time the protective layer 3 can also strengthen the connection strength between the front end of the gold finger 2 and the substrate 1, and when the transfer FPC is repeatedly plugged and unplugged from the connector, the front end of the gold finger 2 can be prevented from warping, thereby increasing the service life of the transfer FPC, reducing the test cost, and improving the test efficiency, a snap fixing through hole 4 is provided on the substrate 1 of the FPC, and after the FPC is inserted into the connector, the snap limiting cylinder on the connector is buckled into the snap fixing through hole 4 to complete the limiting of the FPC, so that the connection of the gold finger 2 after being inserted into the connector is more firmly, and the FPC is prevented from being pulled out during the test, resulting in electrical connection failure, thereby ensuring that the test can be completed smoothly.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. An FPC for preventing gold fingers from warping, comprising a substrate and a plurality of gold fingers arranged side by side on the substrate, characterized in that: A protective layer is arranged at the front end of the gold finger, and the protective layer covers the gold finger and the substrate.

2. The FPC for preventing the gold finger from warping according to claim 1, characterized in that: One side edge of the protective layer is flush with the front end edge of the substrate.

3. The FPC for preventing the gold finger from warping according to claim 1, characterized in that: The width of the protection layer is 1.2-1.5 times the width of the gold finger.

4. The FPC for preventing the gold finger from warping according to claim 1, characterized in that: The thickness of the protective layer is 0.005mm-0.0125mm.

5. The FPC for preventing the gold finger from warping according to claim 1, characterized in that: The protective layer is a PI covering film.

6. The FPC for preventing the gold finger from warping according to claim 1, characterized in that: The protective layer is a scratch-resistant layer.

7. The FPC for preventing the gold finger from warping according to claim 6, characterized in that: The anti-scratch layer is a green oil layer or a rubber layer.

8. The FPC for preventing the gold finger from warping according to claim 1, characterized in that: The protective layer is an integral structure or a segmented structure.

9. The FPC for preventing gold finger from warping according to claim 1, characterized in that: The base material is provided with a buckle fixing through hole.

10. The FPC for preventing the gold finger from warping according to claim 9, characterized in that: The buckle fixing through holes are arranged in two and are distributed on both sides of the substrate.

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