PCB Technical - PCB circuit design and professional terminology

Annular Ring, hole refers to the copper ring that is flat on the board surface around the wall of the through hole. The hole ring on the inner plate is often connected to the outer ground by a cross bridge, and is more often regarded as the end of the line or the station. On the outer layer board, it can be used as a soldering pad for component pin soldering, in addition to being used as a circuit crossing station. There are Pad (with circle), Land (independent point) and so on that are synonymous with this word.

Artwork, Negative In the circuit board industry, this word often refers to black and white negatives. As for the brown "Diazo Film" (Diazo Film), it is also named after Phototool. The negatives used in PCB can be divided into "original negatives" Master Artwork and re-photographed "working negatives" Working Artwork, etc.
Basic Grid The basic grid refers to the vertical and horizontal grid where the conductor layout of the circuit board is designed. In the early days, the grid spacing was 100 mil. At present, due to the prevalence of fine lines and dense lines, the basic grid spacing has been reduced to 50 mils.
Blind Via Hole, refers to a complex multi-layer board, part of the via hole because only a few layers of interconnection, so deliberately incompletely drilled, if one of the holes is connected to the outer board hole On the ring, this special hole like a cup-shaped blind alley is called a "Blind Hole" (Blind Hole).