What is the color of the PCB board, as the name suggests, when you get a PCB board, the most intuitively you can see the oil color on the board, which is what we generally refer to as the color of the PCB board. Common colors include green, blue, red and black, etc. Wait.

1. Green ink is by far the most widely used, the longest in history, and the cheapest in the current market, so green is used by a large number of manufacturers as the main color of their products.

2. Under normal circumstances, the entire PCB board product has to go through the board making and SMT processes during the production process. When making the board, there are several processes that must go through the yellow room, because the green is in the yellow The effect of the light room is better than other colors, but this is not the main reason.

When soldering components in SMT, the PCB has to go through processes such as solder paste and patch and final AOI verification. These processes require optical positioning and calibration. The green background color is better for the identification of the instrument.

3. Common PCB colors are red, yellow, green, blue and black. However, due to problems such as the production process, the quality inspection process of many lines still has to rely on the naked eye observation and recognition of the workers (of course, most of the flying probe testing technology is currently used). The eyes are constantly staring at the board under strong light. This is a very tiring work process. Relatively speaking, green is the least harmful to the eyes, so most manufacturers in the market currently use green PCBs.

4. The principle of blue and black is that they are respectively doped with elements such as cobalt and carbon, which have certain electrical conductivity, and short-circuit problems are likely to occur when power is on. Moreover, green PCBs are relatively environmentally friendly, and in high temperature environments When used in medium, generally no toxic gas will be released.

There are also a small number of manufacturers in the market that use black PCB boards. The main reasons for this are two reasons:

Looks higher-end;
The black board is not easy to see the wiring, which brings a certain degree of difficulty to the copy board;

At present, most of the Android embedded boards are black PCBs.

5. Since the middle and late stages of the last century, the industry has begun to pay attention to the color of PCB boards, mainly because many first-tier manufacturers have adopted green PCB board color designs for high-end board types, so people slowly believe that PCB If the color is green, it must be high-end.