Anti-fracture FPC (Flexible Printed Circuit) reinforcing and punching method
By performing laser depth-controlled pre-cutting in the narrow area of FR4 reinforcement material of FPC, the problem of FR4 reinforcement material being easily broken after punching is solved, and the fracture problem during die cutting is achieved thoroughly.
Patent Information
- Application Number
- CN202510052504.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-03-28
AI Technical Summary
In the FPC production process, FR4 reinforcement materials are prone to fracture problems after punching, especially when the width of the outer edge is less than 1mm, die cutting can easily lead to material breakage.
After attaching a reinforcement plate in the device area of the installation unit, laser depth-controlled pre-cut is performed on the outer edge with a prognostic width less than 1 mm, with a length d=2R+2mm, a depth h=T/2±0.05mm, and then a mold punching operation is performed.
By laser depth control pre-cutting in the narrow area of FR4 reinforcement material, the cutting gap is added, avoiding the fracture problem during die cutting, and effectively solving the problem of FR4 reinforcement punching and fracture.
Smart Images
Figure CN119730046A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an electronic board preparation technology, and in particular to a fracture-proof FPC reinforcement punching method. Background Art
[0002] like Figures 1 to 8 As shown in the figure, a flexible circuit board FPC generally has multiple mounting units on the whole board, and each mounting unit needs to be punched out with a mold to form several unconnected punching slots and holes. One end of the mounting unit is the device area. Since the board is relatively soft, FR4 is a commonly used reinforcement material in the FPC production process. It is often required to be attached to the back of the device area to support the hardness in the subsequent mounting process.
[0003] The FR4 reinforcement on some FPCs exceeds the outer shape, such as Figure 6 If the flange is punched outside the outer shape, the width of the edge will be particularly narrow. FR4 is relatively brittle and hard. When the width of the punched FR4 is less than 1mm, it is easy to break during die punching. Fig. 9 shown.
[0004] Existing manufacturers have been looking for improvement solutions for molds, but so far there is still no good effect. Summary of the invention
[0005] The object of the present invention is to provide a method for reinforcing and punching an FPC to prevent fracture, so as to solve the problems existing in the above-mentioned prior art.
[0006] The present invention discloses a method for reinforcing and punching an FPC to prevent fracture. After attaching a reinforcing plate to the device area of the mounting unit, laser depth control pre-cutting is performed on the outer edge with a pre-cutting width less than 1 mm, and then a mold punching operation is performed after the laser depth control pre-cutting.
[0007] The length of the laser controlled depth pre-cutting of the outer edge is d=2R+2mm; wherein R is the punching radius of the outer edge away from the notch area.
[0008] The outer edge is pre-cut by laser with controlled depth to a depth of h=T / 2±0.05 mm, wherein T is the thickness of the reinforcing plate.
[0009] The anti-fracture FPC reinforcement punching method described in the present invention has the advantage that only a laser half-cut gap is added in a relatively narrow FR4 area before the mold punching. Only a small range of cutting does not require a lot of production time, which completely solves the FR4 reinforcement punching fracture problem. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a structural schematic diagram of the FPC full board described in the present invention.
[0011] Figure 2 It is a structural schematic diagram of the installation unit described in the present invention.
[0012] Figure 3 It is a schematic diagram of the structure after the device area described in the present invention is equipped with a reinforcing plate.
[0013] Figure 4 yes Figure 3 Cross-section view along the AA direction.
[0014] Figure 5 It is a schematic structural diagram of the device region in the present invention.
[0015] Figure 6 It is a structural schematic diagram of the reinforcing plate described in the present invention.
[0016] Figure 7 It is a physical picture of the entire FPC described in the present invention.
[0017] Figure 8 It is a partial enlarged view of the entire FPC panel described in the present invention.
[0018] Fig. 9 This is a real picture of the rupture after reinforcement and punching.
[0019] Fig.10 It is a schematic diagram of an anti-fracture FPC reinforcement punching method described in the present invention.
[0020] Reference numerals:
[0021] 10-FPC full page;
[0022] 20-installation unit, 21-device area;
[0023] 30-reinforcement plate, 31-flange, 32-punching hole, 33-symmetry axis;
[0024] K-notch area. DETAILED DESCRIPTION
[0025] like Fig.10 As shown, the FPC reinforcement punching method for preventing fracture described in the present invention is to perform laser depth control pre-cutting on the outer edge with a pre-punching width less than 1mm after attaching the reinforcement plate to the device area of the mounting unit, and then perform mold punching operation after laser depth control pre-cutting. The length of the laser depth control pre-cutting of the outer edge is d = 2R + 2mm; where R is the punching radius of the outer edge away from the side of the punching groove area. The depth of the laser depth control pre-cutting of the outer edge is h = T / 2 ± 0.05mm; where T is the thickness of the reinforcement plate.
[0026] In some embodiments, laser depth-controlled pre-cutting parameters are shown in the following table:
[0027]
[0028] Based on the FPC reinforcement punching profile of the present invention, when the width is less than 1 mm, after practical verification of multiple production batches, no breakage problem is found.
[0029] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present invention.
Claims
1. A method for reinforcing and punching an FPC to prevent fracture, characterized in that: After attaching the reinforcing plate to the device area of the mounting unit, the outer edge with a pre-punching width less than 1mm is pre-cut by laser depth control, and then the mold punching operation is performed after the laser depth control pre-cut.
2. According to claim 1, a method for reinforcing and punching an FPC to prevent fracture, characterized in that: The length of the laser depth-controlled pre-cutting of the outer edge is d=2R+2mm; wherein R is the punching radius of the outer edge away from the notch area.
3. The anti-fracture FPC reinforcement punching method according to claim 1, characterized in that: The outer edge is pre-cut by laser with controlled depth to a depth of h=T / 2±0.05 mm, wherein T is the thickness of the reinforcing plate.