Artwork Artwork negativesIn the circuit board industry, this word often refers to black and white film. As for the brown Diazo Film, it's also called Phototool. The negative used by PCB can b
2019/08/08
Annular Ring Pore ringRefers to the copper ring that is wound around the wall of the connecting hole and is flat on the plate surface. On the inner panel, the hole ring is often connected with th
2019/08/08
