About The Structural Design Of FPC

FPC flexible circuit boards are relatively fragile parts. If the design is not easy to break, the structure is most concerned about the appearance of the FPC. Under the premise of ensuring the realization of the function, it is as narrow and thin as possible, otherwise it is easy to scrape and break with the shell in the place where the B/C FPC of the mobile phone is passed. When designing the FPC soft board shape, pay attention to the radius of the corner. Generally, the inner corner has a minimum radius of R1 and the outer corner radius is R3 or R4.

The width of the FPC design is related to the pin line width, the line spacing and the pin number. If the number of pins is too large, it is naturally wide, or the double panel is used instead of the single panel to reduce the width. Of course, the thickness is bound to increase. As for the length of the FPC, because the FPC has better flexibility, good bending, and the length can be left with a margin, there is no need to fully calculate. In addition, it is very important that when designing the FPC shape, pay attention to the gap with the B/C parts and the via holes. When the wall thickness and strength of the B/C parts are satisfied, try to leave more space for FPC soft board, the design of this place is the top priority of our design.

Finally, I hope that when designing the FPC soft board with Pro/E, use the sheet metal module instead of the part-solid module, because in the sheet metal module, the FPC flexible circuit board can make the FPC which is the closest to the actual situation. Type, bending and flattening are easy, and easy to modify, can truly simulate the theoretical real position of the FPC flexible circuit board in the via. Note: The above design is only for structural design. Some hardware-related indicators are not mentioned here. When designing, you should also cooperate with the hardware to communicate with the manufacturer to make the most perfect design.