According to the materials made, printed circuit boards can be divided into rigid printed boards and flexible printed boards.
Rigid circuit boards include phenolic paper laminates, epoxy paper laminates, polyester glass mat laminates and epoxy glass cloth laminates.
Flexible printed circuit board is also called FPC and soft board, which has the characteristics of high wiring density, light weight and thin thickness. It is a highly reliable and excellent flexible printed circuit board. Flexible circuit boards are widely used in the electronic computer, communication, aerospace and home appliance industries.
In PCB proofing, what are the differences between flexible PCB circuit boards and rigid circuit boards?
1. Current carrying capacity of wires: Compared with rigid circuit boards, the heat dissipation performance of flexible circuit boards is relatively poor. Because the heat dissipation of the flexible circuit board is considered, it is necessary to leave additional width or spacing for the wires.
2. Shape. Typically, choosing a rectangle is a good way to save the substrate, and there should be plenty of usable margin near the edges. Sharp inside corners may cause the board to tear. Therefore, the FPC wire width and spacing should be minimized, and the transition must be as smooth as possible. Sharp corners naturally concentrate stress and lead to lead failure.
3. Flexibility: The flexibility of rigid circuit boards cannot be compared with flexible circuit boards. For a large number of bending cycles, flexible circuit boards have better performance.
