PCB has many types, which includes single-sided circuit board, double-sided circuit board and multi-layer circuit boards etc. The production process of printed circuit board is relatively complex since it involves a wide range of processes from simple mechanical to complex mechanical processing, including common chemical reactions, photochemical, electrochemical, thermo-chemical and other processes, computer-aided design CAM, and many other aspects of knowledge. Today we will briefly introduce the PCB manufacturing process, so that you have a preliminary understanding for the PCB manufacturing process.
We know that the substrate of the board itself is made of materials that are insulated and not easy to bend. The small circuit material that can be seen on the surface is copper foil. The copper foil is originally covered on the entire board, and part of it is etched away during the manufacturing process. The remaining part becomes a network of fine lines. These lines are called conductors or wiring, and are used to provide circuit connections for parts on the PCB.
In order to fix the parts on the small printed circuit board, people will solder the pins directly on the wiring. On the most basic printed circuit board, the parts are concentrated on one side, and the wires are concentrated on the other side. It needs to make holes in the board so that the pins can pass through the board to the other side, and the pins of the parts are soldered on the other side. Therefore, the front and back sides of the PCB are called component sides and solder side.
If there are some parts on the printed circuit board surface that need to be removed or reinstalled after the production is completed, then the socket will be used when the part is installed. Since the socket is directly soldered on the board, the parts can be disassembled and assembled at will.
If you want to connect two PCBs to each other, generally you should use the edge connector commonly known as "golden finger". There are many exposed copper pads on the gold fingers, which are actually part of the PCB wiring. Usually, when connecting, you may insert the gold fingers on one of the PCBs into the appropriate slots on the other PCB.
The green or brown on the PCB is solder mask color. This layer is an insulating protective layer, which can protect the copper wire and prevent the parts from being soldered to incorrect places. In addition, a layer of silk screen printing surface will be printed on the solder mask. Usually words and symbols that mostly are white are printed on this to indicate the position of each part on the board. The screen printing surface is also called the icon surface.
The printed circuit board component etches the complicated circuit copper wires between parts and parts on a board after careful and neat planning, and provides the main support for the installation and interconnection of electronic components. So, it is the indispensable basic part for all electronic products.
