The names of circuit boards include: ceramic circuit boards, alumina ceramic circuit boards, aluminum nitride ceramic circuit boards, circuit boards, PCB boards, aluminum substrates, high-frequency boards, thick copper plates, impedance boards, PCBs, ultra-thin circuit boards, ultra-thin circuit boards, printed (copper etching technology) circuit boards, etc. Circuit boards make circuits miniaturized and intuitive, playing an important role in the mass production of fixed circuits and optimizing the layout of electrical appliances. A circuit board can be called a printed circuit board or a printed circuit board, with the English name "Printed Circuit Board" PCB (Flexible Printed Circuit Board) FPC circuit board (FPC circuit board, also known as flexible circuit board) is a highly reliable and excellent flexible printed circuit board made of polyimide or polyester film as the substrate. It has the characteristics of high wiring density, light weight, thin thickness, and good bending performance. The birth and development of flexible printed circuit boards (FPC, Soft and hard combination plates) - FPC and PCB, This has given birth to the new product of soft and hard combination boards. Therefore, a soft hard combination board refers to a circuit board with FPC and PCB characteristics formed by combining flexible circuit boards and hard circuit boards through pressing and other processes according to relevant process requirements.