What are the particulars of PCB board color?
What is the color of the PCB board? As the name suggests, when you get a PCB board, you can most intuitively see the color of the oil on the board, which is the color of the PCB board. The common colors are green, blue, red, and black Wait.
1. Green ink is by far the most widely used and has the longest history, and it is also the cheapest in the current market, so green is used by a large number of manufacturers as the main color of its products.
2. Under normal circumstances, the entire PCB board product must go through board making and SMT processes during the production process. When making the board, there are several processes that must go through the yellow light chamber, because green is in the yellow. The effect of the light chamber is better than other colors, but this is not the main reason.
When SMT is used to solder components, the PCB must go through solder paste and patch, and the final AOI verification. These processes all require optical positioning and calibration. A green background color has a better identification effect on the instrument.
3.Common PCB colors are red, yellow, green, blue and black. However, due to the manufacturing process and other problems, the quality inspection process of many lines still has to rely on the worker's naked eyes to observe and identify (of course, most of the current flying probe test technology is used). Eyes are constantly staring at the board under bright light. This is a very tiring work process. Relatively speaking, green is the least harmful to the eyes, so most manufacturers on the market currently use green PCBs.
4. The principle of blue and black is that it is doped with elements such as cobalt and carbon, which have certain conductive properties. It is likely that short-circuit problems will occur when the power is applied, and the green PCB is relatively environmentally friendly. When used in general, no toxic gas is released.
There are also a small number of manufacturers in the market who use black PCBs. The main reasons for this are two reasons:
It is not easy to see the wiring in the black board, which will bring some difficulty to copying the board;
5. From about the middle and late period of the last century, the industry has begun to pay attention to the color of PCB boards, mainly because the high-end boards of many first-tier manufacturers have adopted green PCB board color designs, so people slowly think of PCBs If the color is green, it must be high-end.
In fact, based on a variety of reasons, Xiaobian thinks that it is generally better to use a green PCB.