Shenzhen HongYuan Electronics Co.,Ltd 
The structure of each layer is basically the circuit and the drawing, which is roughly like this, it is energized, and the intermediate medium is generally an insulator.
PCB multilayer board refers to the multilayer circuit board used in electrical products. Multilayer boards use more single-sided or double-sided wiring boards.
A printed circuit board with one double-sided inner layer and two single-sided outer layers or two double-sided inner layers and two single-sided outer layers is alternately connected through a positioning system and insulating bonding materials, and the conductive pattern The printed circuit boards interconnected according to the design requirements become four-layer and six-layer printed circuit boards, also known as multi-layer printed circuit boards.
With the continuous development of SMT (Surface Mount Technology) and the continuous introduction of a new generation of SMD (Surface Mount Devices), such as QFP, QFN, CSP, BGA (especially MBGA), electronic products are more intelligent and miniaturized, so It has promoted the major reform and progress of PCB industry technology.
Since IBM first successfully developed high-density multilayer boards (SLC) in 1991, major groups in various countries have also successively developed various high-density interconnection (HDI) microplates.
The rapid development of these processing technologies has prompted the design of PCBs to gradually develop in the direction of multi-layer and high-density wiring.
With its flexible design, stable and reliable electrical performance and superior economic performance, multilayer printed boards have been widely used in the production and manufacture of electronic products.
