Production process of circuit board

PCB production process is more complex, it involves a wide range of processes, from simple machining to complex machining, there are common chemical reactions, photochemistry, electrochemistry, thermochemistry and other processes, computer-aided design, cam and other knowledge. Moreover, there are many process problems in the production process, and new problems will be encountered from time to time, while some problems disappear without finding out the causes. Because the production process is a non continuous assembly line form, any problem in any link will cause the whole line shutdown or a large number of waste reports. If the printed circuit board is scrapped, it can not be recycled, and it is the responsibility of the process engineer As a result, many engineers have left the industry and transferred to PCB equipment or material suppliers for sales and technical services.

The base plate of the board itself is made of insulating and inflexible materials. The small circuit material that can be seen on the surface is copper foil. Originally, the copper foil was covered on the whole board, but part of it was etched away during the manufacturing process, and the remaining part became a network of small circuits. These circuits are called conductor patterns or wiring, and are used for wiring Provide circuit connection of PCB parts

In order to fix the parts on the PCB, we directly weld their pins on the wiring. In the most basic PCB (single panel), the parts are concentrated on one side, and the wires are concentrated on the other side. In this way, we need to make holes in the board, so that the pins can pass through the board to the other side, so the pins of the parts are welded on the other side. Because of this, the positive and negative sides of the PCB The faces are called component side and solder side respectively

If there are some parts on the PCB, which can be removed or installed back after manufacturing, then the socket will be used when installing the parts. Because the socket is directly welded on the board, the parts can be disassembled at will

If we want to connect two PCBs to each other, we usually use the edge connector commonly known as "golden finger". The golden finger contains many bare copper pads, which are actually part of the PCB wiring. Usually, when connecting, we insert the golden finger on one PCB into the appropriate slot on the other PCB (usually called expansion slot slot) Display card, sound card or other similar interface card are connected with the motherboard by golden finger

Green or brown on PCB is the color of solder mask. This layer is an insulating protective layer, which can protect copper wire and prevent parts from being soldered to the wrong place. In addition, a layer of silk screen will be printed on the solder mask. Usually, words and symbols (mostly white) will be printed on this surface to mark the position of each part on the board The brush face is also called the icon face

Printed circuit board (PCB) etches the complex copper wire between parts on a board after careful planning, providing the main support for the installation and interconnection of electronic components. It is an indispensable basic part of all electronic products.

Printed circuit board (PCB) is a flat plate made of non-conductive material, on which there are usually pre drilled holes to install chips and other electronic components. The holes of the components help to connect the metal paths that are pre-defined on the board in an electronic way. After the pins of the electronic components pass through the PCB, they are adhered to the PCB with conductive metal electrodes to form a circuit.