What color is good for the circuit board
For a long time, circuit board buyers have always had doubts about the color of PCB, and they don't know what color PCB board is of high quality. What effect does the color of the PCB have on its performance?
First of all, as a printed circuit board, PCB mainly provides interconnection between electronic components. There is no direct relationship between color and performance, and the difference in pigments does not affect the performance of electrical appliances. The performance of the PCB board is determined by factors such as the material used, the circuit design and the number of layers of the board. However, in the process of washing the PCB, black is the most likely to cause color difference. If the raw materials and manufacturing process used by the PCB factory are slightly different, the PCB defect rate will increase due to the color difference. This directly leads to an increase in production costs.
The raw material of PCB is glass fiber and resin that can be seen everywhere in our daily life. The glass fiber and resin are combined and hardened to become a heat-insulating, insulating, and not easy to bend board, which is the PCB substrate. Of course, a PCB substrate made of glass fiber and resin alone cannot conduct signals. Therefore, on the PCB substrate, the manufacturer will cover a layer of copper on the surface, so the PCB substrate can also be called a copper-clad substrate.
As the circuit traces of the black PCB are difficult to identify, it will increase the difficulty of repair and debugging in the R&D and after-sales stages. Generally, if there is no brand with profound R&D designers and a strong maintenance team, black PCBs will not be easily used. The use of black PCB is an expression of a brand's confidence in the design and post-maintenance team. From the side, it is also a manifestation of the manufacturer's confidence in its own strength.
Based on the above reasons, major manufacturers will carefully consider when choosing PCB board designs for their products. Therefore, most of the products with large shipments in the market that year used red PCBs, green PCBs or blue PCBs. Black PCBs normally only be seen on mid-to-high-end or top-level products. Therefore, customers should no longer think that black PCBs are better than black PCBs. The green PCB is ready.
Color selection during circuit board proofing
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 light room, because green is in 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 the process of solder paste and patching and the final AOI calibration light. These processes all need to be optically positioned and calibrated. 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 visual observation and recognition (of course, most of the current flying probe test technology is used). In the case of strong light, the eyes keep staring at the board. This is a very large 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 they are doped with cobalt and carbon lamp elements respectively, and have certain electrical conductivity. Short circuit problems are likely to occur when power is on, and green PCBs are relatively environmentally friendly, and in high temperature environments When used in medium, generally no toxic gas will be released.
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