PCB Tech - What are the factors that affect the life of FPC

What are the factors that affect the life of FPC

Fpc cable has good flexibility, good bendability, the length can be left margin, there is no need to complete precise calculation. If the design is too long, it can be gradually shortened according to the analysis results after the sample is made and the turning experiment is completed. If the number of pins is too large, it is natural to make the width, or use a double panel instead of a single panel to reduce the width. Of course, the thickness of the fpc cable will inevitably increase. The pin line width and pin spacing are also different according to the strength of the circuit board manufacturers. At present, the minimum circuit board manufacturers can achieve 0.1mm.

Due to the limitation of the thickness of the mobile phone, the shaft, and the FPC vias of the B/C parts, the width of the fpc cable is generally designed to be 3 or 3.5mm (if calculated by 3.5mm, the distance between the two edges of the fpc edge is 0.4mm, respectively, Calculate based on the line width and line spacing of 0.1mm, so that each layer can be laid with about 13 lines), the thickness is 0.2 or 0.3mm (fpc is 2+2 or 3+2 structure).

When designing the shape of the fpc, pay attention to the clearance between the B/C parts and the vias. When the wall thickness and strength of the B/C parts are all satisfied, try to leave more space for the FPC. Since the fpc has to pass through these places, it will swing as the phone flip opens and closes, and the fpc itself is relatively fragile. This place is also the place where fpc is most prone to problems. It is easy to scratch the fpc and the shell. Not only will there be noise when the flip cover is rotated, but also the FPC will be broken over time, which will affect the life of the FPC.

High-current connectors are also indispensable in pipeline installation; the root female affix, also called root hoop, lock nut, one end is a short thread buckle, the other end is a long thread buckle (the root has no tip) The short pipe section and a root female, plus a pipe hoop with a harness on the inner wall, form a filament. Its function is the same as a live joint, which is used as a detachable live connection. When used in the core of the radiator, the harness The pipe hoop can also be omitted; the flange plate, the left and right pieces form a pair, and the function is the same as that of the live joint. The specification is d50mm or more. Since the two ends of the large-size valve are mostly flanged interfaces, the flange plate is also mostly used for the connection of the pipeline and the valve.

The design of this place is the top priority of Guangjie's new design. Finally, I hope that when designing fpc with Pro/E, you use sheet metal modules instead of part-solid modules, because in the sheet metal modules, fpc can make the fpc appearance closest to the actual situation, bending and Flattening is easy and easy to modify, and it can truly simulate the theoretical real position of the FPC in the via