The circuit board can be called PCB (Printed Circuit Board)
Why are circuit boards (PCBs) mostly green? This is a detail that engineers rarely think about. Today, AiXun will take a look at the general opinion with you. Let's understand this green board first
PCB board - solder mask
A printed circuit board (PCB) usually consists of pads, vias, solder mask, silk screen, copper wires, and various components. Among them, the solder mask refers to the part on the printed circuit board to be painted with green oil. In fact, solder resist inks are not only green, but also red, yellow, blue, purple, black, etc., but green is the most common.
The role of the solder mask:
(1) Prevent physical disconnection of conductor circuits;
(2) In the soldering process, prevent short circuit caused by bridging;
(3) Solder only the parts that must be soldered to avoid waste;
(4) Reduce copper pollution in the butt welding tank;
(5) Prevent insulation deterioration and corrosion caused by external environmental factors such as dust and moisture;
(6) High insulation, which makes it possible to increase the density of the circuit.
Common circuit boards are mostly green. Everyone has discussed what the green layer is (solder mask, green oil), and what it is for (to prevent short circuit caused by contact between solder paste and copper surface during soldering). Let's listen to the common opinion.
View one
1. Green is less irritating to the eyes. Green is good for the eyes, protects the eyes and fights fatigue. Production and maintenance personnel are not prone to eye fatigue when staring at the PCB board for a long time, and the damage to the eyes is less.
View two
The cost is lower. Because the commonly used color is green, the purchase volume of green paint will be larger, and the purchase cost of green paint will be lower than other colors. So relatively speaking, the cost of using green paint is relatively low.
View three
Green oil ink can achieve smaller error, smaller area, and higher precision. When the board is soldered by SMT, it has to go through tinning, patching and final AOI verification. These processes all require optical positioning and calibration. The green background color is better for the identification of the instrument.
The above is the technical documentation of an ink supplier. From the technical documentation, it can be seen that green, red, and blue have higher design accuracy than other colors.
Why do some companies increase the price to make white and black PCBs?
Black and white are helpful in some special occasions. For example, most LED light panels use black characters on a white background. The reason is that the white one will reflect light and absorb less heat.
Black, like some 5050 RGB bulbs use black. The advantage of this is to reduce floodlight and light reflection, so that the assembled dot matrix screen will have a higher display contrast of each pixel. Secondly, it can also avoid the reflection of external light and improve the display effect of the screen, especially for outdoor applications.
Black PCB is more high-end?
Since the high-end boards of some first-tier manufacturers have adopted black PCB color design, people gradually think that if the PCB color is black, it must be high-end. After that, more and more manufacturers began to use black PCB coating - it can be said that this is an inexplicable phenomenon. Black does not mean that the quality of the motherboard must be good. This is entirely due to product misleading caused by first-line brands using black to identify product positioning. It is true that black PCB can indeed show its own technical strength, because black PCB is very difficult to see the wiring, so that both design and after-sales will suffer unprecedented cost pressure, and board manufacturers with strong technical strength use black PCB The color tone is not because black can improve the performance of the motherboard. From the perspective of rational analysis, it is also known that the color alone cannot improve the performance of the board.
The difference between the black PCB and the blue, yellow and other color PCBs is that the color of the solder resist paint is different at the end. If the PCB design and manufacturing process are exactly the same, the color will not have any impact on performance.
Summarize
Whether it is black or green, board with good performance and good heat dissipation is a good board.
The above all are the various opinions about the most common green color of PCB boards that AiXun Precision Soldering has compiled for you.
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