The Composition of PCB (2)
Hello every one. As we discussed before, here comes the second news for more info about bare pcb.
The layer on top of the copper foil is called the solder mask layer. This layer gives the PCB its green color. It is overlaid onto the copper layer to insulate the copper traces from accidental contact with other metal, solder, or conductive bits. This layer helps the user to solder to the correct places and prevent solder jumpers.
Green solder mask is applied to the majority of the PCB, covering up the small traces but leaving the the silver rings and SMD pads exposed so they can be soldered to.Solder mask is most commonly green in color but nearly any color is possible.
The white silkscreen layer is applied on top of the solder mask layer. The silkscreen adds letters,numbers,and symbols to the PCB that allow for easier assembly and indicators for humans to better understand the board. We often use silkscreen labels to indicate what the function of each pin or LED.
Silkscreen is most commonly white but any ink color can be used. Black, gray, red, and even yellow silkscreen colors are widely available; it is, however, uncommon to see more than one color on a single board.
So that you’ve got an idea of what’s the PCB structure. We will introduce some more technology about pcb in the next chapter.
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