In daily life, most PCB boards are green, but sometimes, we can see blue and even black PCBs in addition to green. Why do PCB boards choose different colors? Why is green the most common color? This paper will reveal the secret of “colorful” printed circuit boards.
Green ink is the most widely used ink with the most extended history, and it is also the cheapest in today’s market. Therefore, many manufacturers use green ink as the primary color of their products.
Generally speaking, the entire PCB board product has to go through board making and SMT in the production process. When making the board, several processes pass through the yellow light room, and the green-green effect must be better than other colors. However, when SMT is used for soldering components, the PCB must pass through the process of applying solder paste and patch and the final AOI calibration lamp process. In these processes, optical positioning calibration is required, and the green background color has a good effect on the recognition of the instrument.
Commonly used PCB colors are red, yellow, green, blue, and black. However, due to many problems such as production technology, the quality inspection process of many lines still relies on the naked eye observation and identification of workers or the use of flying probe detection technology. Because green is the least harmful to the eyes when it is under strong light, most manufacturers on the market currently use green PCBs.
And blue and black are doped with elements such as cobalt and carbon, respectively, and have a certain degree of conductivity, which is prone to short-circuit problems when energized. The green PCB is relatively environmentally friendly and generally does not release any toxic gas when used in a high-temperature environment.
Moreover, there are also a few manufacturers in the market who use black PCB boards. This problem is mainly because the black color looks “higher”, but the wiring inside the blackboard is difficult to see, so it brings a certain degree of difficulty to copying the board. At present, most Android-embedded boards use black PCBs.
In fact, since the middle and late last century, the industry has begun to pay attention to the color problem of PCB boards. Since many high-end board types of first-tier factories are designed with green PCB board, people gradually think that green is the “default” color of PCB.
The choice of printed circuit board color is the epitome of the rise, development, and selection of emerging technology in the development of modern technology. The birth and development of printed circuit boards are constantly evolving and changing in the countless processes that promote the electronics industry. Perhaps in the near future, there may be other colors of PCBs to replace the current trend of environmental protection.
We can produce many colors of PCBs, please inquiry us if you need it.
