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FPC soft plate is a relatively fragile part. It is easy to break if it is not designed properly. For the structure, we are most concerned about the appearance of FPC. On the premise of ensuring the realization of the function, try to be narrow and thin, otherwise it is easy to scratch and break the shell at the FPC hole of the B/C part of the mobile phone. When designing the appearance of FPC soft board, pay attention to the radius of the corner. Generally, the minimum radius of the inner corner is R1, and the radius of the outer corner is R3 or R4.

Structural design considerations

1. The width of the design is related to the pin line width, line spacing and pin number. If the pin number is too large, it will be widened, or the width will be reduced by replacing the single panel with double-sided panels. Of course, the thickness will increase.

2. As for the length of the FPC, because the FPC has good flexibility and good bending, the length can be left with margin, so it is not necessary to calculate accurately.

3. In addition, it is very important that we pay attention to the clearance between the B/C part and the through hole when designing the FPC appearance. When the wall thickness and strength of the B/C part have been met, we should try to leave more space for the FPC soft board. The design of this place is the top priority of our design.

4. Finally, I hope you can use the sheet metal module instead of the part-solid module when using Pro/E to design the FPC flexible circuit board, because in the sheet metal module, the FPC flexible circuit board can make the FPC appearance that is closest to the actual situation, and it is easy to bend and flatten, and it is easy to modify, and can truly simulate the theoretical real position of the FPC flexible circuit board in the vias.