Flexible printed circuit (FPC) capable of preventing routing from being broken
By setting the inner concave part of the width greater than the bending area on the FPC's reinforcement board, the problem of the copper thread easily broken when the FPC is bent at the edge of the reinforcement board, and the effect of reducing the rate of bad products and improving product competitiveness.
Patent Information
- Application Number
- CN202421049278.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-14
AI Technical Summary
Existing FPCs can easily cause copper wire to break when the edge of the reinforcement plate is bent, increasing the defective yield rate and reducing product competitiveness.
On one side of the reinforced board, the inner concave part is set, and the concave part is located on one side of the bending area of the circuit board. The width is greater than the width of the bending area to cushion the stress of the bending layer.
Effectively prevent the broken copper thread when bending on the edge of the replenishment, ensure the normal use of the FPC, reduce the probability of bad products, and increase the competitiveness of the product.
Smart Images
Figure CN222424111U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit board manufacturing, and more specifically to an FPC capable of preventing wiring from breaking. Background Art
[0002] Nowadays, FPCs are generally equipped with reinforcement plates on their outer surfaces to increase the strength of the FPC. After the FPC is reinforced, especially the steel reinforcement plate, its edges are sharp and the stress is relatively large. The edge of the reinforcement plate is generally the bending area. When bending at this position, it is easy to break the FPC copper wire, making the FPC unusable, resulting in an increase in defective products and reduced product competitiveness. Utility Model Content
[0003] The technical problem to be solved by the utility model is how to prevent the copper wire of the FPC from being broken when the edge of the reinforcing plate is bent, thereby ensuring the normal use of the FPC, reducing the probability of defective products, and improving the competitiveness of the product.
[0004] The technical problem to be solved by the utility model is achieved through the following technical solutions:
[0005] In order to solve the above technical problems, the utility model provides an FPC for preventing wiring from being broken, which includes a circuit board, a reinforcement plate and a connector, the reinforcement plate is fixed on the upper surface of the circuit board, the connector is fixed on the lower surface of the circuit board, and an inner recess is provided on one side of the reinforcement plate, the inner recess is located on one side of a bending zone extending outward from the circuit board, and the width of the inner recess is greater than the width of the bending zone of the circuit board.
[0006] As a preferred implementation of the FPC for preventing wiring breakage provided by the utility model, the inner recess is a through hole.
[0007] As a preferred implementation of the FPC for preventing wiring from breaking provided by the utility model, the inner recess is a blind hole and is arranged upward from the lower surface of the reinforcement plate.
[0008] As a preferred implementation of the FPC for preventing wiring breakage provided by the utility model, the depth of the inner recess is 0.3 mm-0.5 mm.
[0009] As a preferred implementation of the FPC for preventing wiring breakage provided by the utility model, the circuit board includes a substrate layer and a first circuit layer and a second circuit layer respectively arranged on both sides of the substrate layer.
[0010] As a preferred implementation of the FPC for preventing wiring breakage provided by the utility model, the second circuit layer is provided with a window, the window position forms a single-layer wiring area, and the non-window position forms a double-layer wiring area, the first circuit layer is close to the reinforcement plate, and the second circuit layer is far away from the reinforcement plate.
[0011] As a preferred implementation of the FPC for preventing wiring breakage provided by the utility model, the shortest horizontal distance between the window position of the second circuit layer and the reinforcement plate is 0.5 mm-1 mm.
[0012] As a preferred implementation of the FPC for preventing wiring breakage provided by the utility model, a soldering pad is provided on the upper surface of the circuit board, and the upper and lower surfaces of the circuit board are covered with EMI shielding film, and the EMI shielding film is provided with an avoidance position at the soldering pad.
[0013] As a preferred implementation of the FPC for preventing wiring breakage provided by the utility model, the edge of the EMI shielding film located at the avoidance position is more than 0.5 mm away from the edge of the pad.
[0014] As a preferred implementation of the FPC for preventing wiring breakage provided by the utility model, a PET film is arranged between the circuit board and the EMI shielding film, and the edge of the PET film close to the avoidance position exceeds the edge of the EMI shielding film.
[0015] The utility model has the following beneficial effects:
[0016] Since a concave portion is provided on one side of the reinforcing plate, the concave portion is located on one side of the bending area extending outward from the circuit board and the width of the concave portion is greater than the width of the bending area of the circuit board, the bending area of the circuit board will not touch the reinforcing plate when bending and effectively buffer the stress of the bending layer, preventing the copper wire of the circuit board from being broken when the edge of the reinforcing plate is bent, thereby ensuring the normal use of the FPC, reducing the probability of defective products, and improving the competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the scheme in the present application, 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 present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 The utility model provides a structural schematic diagram of an FPC for preventing wiring from breaking.
[0019] Figure 2 for Figure 1Cross-sectional view at AA in the middle.
[0020] Figure 3 for Figure 2 Schematic diagram of the improved structure.
[0021] Figure 4 for Figure 3 Enlarged view of point B in FIG.
[0022] Figure 5 This is a schematic diagram of the structure of Example 2.
[0023] Description of Figure Numbers:
[0024] Circuit board 1; reinforcement board 2; connector 3; inner recess 21;
[0025] Base material layer 11; first circuit layer 12; second circuit layer 13;
[0026] Solder pad 4; EMI shielding film 5; PET film 6. DETAILED DESCRIPTION
[0027] 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.
[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0029] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0030] The utility model provides an FPC for preventing wiring from breaking, which comprises a circuit board, a reinforcement plate and a connector, wherein the reinforcement plate is fixed on the upper surface of the circuit board, the connector is fixed on the lower surface of the circuit board, an inner recess is arranged on one side of the reinforcement plate, the inner recess is located on one side of a bending area extending outward from the circuit board, and the width of the inner recess is greater than the width of the bending area of the circuit board.
[0031] Since a concave portion is provided on one side of the reinforcing plate, the concave portion is located on one side of the bending area extending outward from the circuit board and the width of the concave portion is greater than the width of the bending area of the circuit board, the bending area of the circuit board will not touch the reinforcing plate when bending and effectively buffer the stress of the bending layer, preventing the copper wire of the circuit board from being broken when the edge of the reinforcing plate is bent, thereby ensuring the normal use of the FPC, reducing the probability of defective products, and improving the competitiveness of the product.
[0032] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention.
[0033] Example 1
[0034] See also Figure 1 and Figure 2 , an FPC for preventing wiring from being broken provided by the utility model, comprising a circuit board 1, a reinforcement board 2 and a connector 3, wherein the reinforcement board 2 is fixed on the upper surface of the circuit board 1, and the connector 3 is fixed on the lower surface of the circuit board 1, and an inner recess 21 is provided on one side of the reinforcement board 2, and the inner recess 21 is located on one side of the bending area extending outward from the circuit board 1, and the width of the inner recess 21 is greater than the width of the bending area of the circuit board 1. Since the inner recess 21 is provided on one side of the reinforcement board 2, and the inner recess 21 is located on one side of the bending area extending outward from the circuit board 1 and the width of the inner recess 21 is greater than the width of the bending area of the circuit board 1, the bending area of the circuit board 1 will not touch the reinforcement board 2 when bending, and the stress of bending over the layer is effectively buffered, and the copper wire of the circuit board 1 is prevented from being broken when the edge of the reinforcement board 2 is bent, thereby ensuring the normal use of the FPC, reducing the probability of defective products, and improving the competitiveness of the product.
[0035] Furthermore, in this embodiment, the inner recess 21 is a through hole, which can be completely open, and even if the bending angle of the bending zone is large, it can be ensured that it does not contact the reinforcing plate 2, thereby preventing the circuit board 1 from breaking. In other embodiments, the inner recess 21 can also be set as a blind hole, and the blind hole is set upward from the lower surface of the reinforcing plate 2. This structure can retain the reinforcing strength of the reinforcing plate 2 to a greater extent, but the bending angle of the bending zone will be limited.
[0036] Furthermore, the depth of the inner recess 21 is 0.3 mm-0.5 mm.
[0037] See also Figure 3 and Figure 4 Furthermore, the circuit board 1 includes a substrate layer 11 and a first circuit layer 12 and a second circuit layer 13 respectively arranged on both sides of the substrate layer 11. The circuit board 1 is a double-layer circuit board 1.
[0038] Furthermore, the second circuit layer 13 is provided with a window, the window position forms a single-layer wiring area, and the non-window position forms a double-layer wiring area. The first circuit layer 12 is close to the reinforcement plate 2, and the second circuit layer 13 is far away from the reinforcement plate 2, so that the single-layer wiring area is far away from the reinforcement plate 2 to avoid continuous steps and easy breakage.
[0039] Furthermore, the shortest horizontal distance between the opening position of the second circuit layer 13 and the reinforcing plate 2 is 0.5 mm-1 mm, so as to avoid increasing the stress at the reinforcing plate 2 .
[0040] Example 2
[0041] See also Figure 5 As a further optimization scheme of Example 1, in this embodiment, the upper surface of the circuit board 1 is provided with a pad 4, and the upper and lower surfaces of the circuit board 1 are covered with an EMI shielding film 5, and the EMI shielding film 5 is provided with an avoidance position at the pad 4. Since the upper and lower surfaces of the circuit board 1 are provided with the EMI shielding film 5, the electromagnetic shielding capability of the circuit board 1 can be greatly improved, the stability of signal transmission is improved, various functional problems and poor display effects are avoided, and the competitiveness of the product is improved.
[0042] Furthermore, the edge of the EMI shielding film 5 located at the avoidance position is more than 0.5 mm away from the edge of the pad 4, so as to prevent the edge of the EMI shielding film 5 from contacting the pad 4 and causing a circuit break.
[0043] Furthermore, a PET film 6 is provided between the circuit board 1 and the EMI shielding film 5, and the edge of the PET film 6 near the avoidance position exceeds the edge of the EMI shielding film 5. By extending the edge of the PET film 6 near the pad 4, the edge of the PET film 6 is pulled away from the edge of the EMI shielding film 5 by a certain distance, so that even if there is a certain operation error during attachment, the edge of the EMI shielding film 5 can be ensured not to touch the edge of the pad 4, thereby insulating the edge of the EMI shielding film 5, preventing the occurrence of a short circuit problem caused by the edge of the EMI shielding film 5 touching the pad 4, and improving the attachment efficiency and production yield.
[0044] 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.
[0045] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application 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 present application more thorough and comprehensive. Although the present application 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 perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.
Claims
1. An FPC for preventing wiring from breaking, characterized in that: It includes a circuit board, a reinforcement plate and a connector, wherein the reinforcement plate is fixed on the upper surface of the circuit board, the connector is fixed on the lower surface of the circuit board, and an inner recess is provided on one side of the reinforcement plate, the inner recess is located on one side of a bending area extending outward from the circuit board, and the width of the inner recess is greater than the width of the bending area of the circuit board.
2. The FPC for preventing wiring from breaking according to claim 1, characterized in that: The inner recess is a through hole.
3. The FPC for preventing wiring from breaking according to claim 1, characterized in that: The inner recess is a blind hole and is arranged upward from the lower surface of the reinforcing plate.
4. The FPC for preventing wiring from breaking according to claim 1, characterized in that: The depth of the inner recess is 0.3 mm to 0.5 mm.
5. The FPC for preventing wiring from breaking according to claim 1, characterized in that: The circuit board comprises a substrate layer and a first circuit layer and a second circuit layer respectively arranged on both sides of the substrate layer.
6. The FPC for preventing wiring from breaking according to claim 5, characterized in that: The second circuit layer is provided with windows, the window position forms a single-layer wiring area, and the non-window position forms a double-layer wiring area. The first circuit layer is close to the reinforcement plate, and the second circuit layer is far away from the reinforcement plate.
7. The FPC for preventing wiring from breaking according to claim 6, characterized in that: The shortest horizontal distance between the window position of the second circuit layer and the reinforcing plate is 0.5 mm-1 mm.
8. The FPC for preventing wiring from breaking according to claim 1, characterized in that: A soldering pad is arranged on the upper surface of the circuit board, and both the upper surface and the lower surface of the circuit board are covered with an EMI shielding film, wherein the EMI shielding film is provided with an avoidance position at the soldering pad.
9. The FPC for preventing wiring from breaking according to claim 8, characterized in that: The edge of the EMI shielding film located at the avoidance position is more than 0.5 mm away from the edge of the pad.
10. The FPC for preventing wiring from breaking according to claim 8, characterized in that: A PET film is arranged between the circuit board and the EMI shielding film, and an edge of the PET film close to the avoidance position exceeds an edge of the EMI shielding film.