PCB is divided into single-panel and multi-panel. How to distinguish the front and back of PCB? And what is the difference between the front and back of PCB? Take everyone to understand briefly.
For single-sided boards, there is a small difference here that we need to pay attention to. If a PCB file has only lines and no other characters, we need to confirm on the first page whether the lines are drawn on the top layer of the PCB or on the bottom layer. If it is on the If it is the top layer, then it stands to reason that this side is the front; if it is the bottom layer, it is the rever side. However, this statement is logically inferred. Of course, there are also some special cases, some of which are rever, so it is best to ask the customer, if it is a double-sided board, there is no such problem. If there are characters on the PCB file, it will be easier to distinguish. If the characters are positive, then that layer is the front side. If it is revers, it is the rever side. This distinction is relatively easy. To put it simply, the difference between the front and back of a circuit board is that the one with many small dots on the circuit board is the back, that is, the side with tin behind it, and the other side is the front.
The distinction between the front and back of PCB is now understood, so how to distinguish single-sided and double-sided printed circuit boards? Double-sided printed circuit boards have upper and lower layers of conductor patterns, and the upper and lower vias are connected by through holes. In the processing of printed circuit boards, the hole wall of the through hole is plated with a copper layer to make the upper and lower layers conduct. Double-sided printed circuit boards usually use double-sided copper-clad laminates. The copper surface is made with anti-corrosion circuit patterns, and the excess copper foil is removed by chemical etching to form a conductor pattern, so that different lines can be divided into different network connections to meet the needs of the product.
