Clearance
2019-08-08 20:38:51
Clearance
Margin, clearance, empty ring
It refers to the hollow ring formed by etching the copper foil around the through hole if the conductor surface of the multi-layer board is not connected with the hole wall of the through hole, which is called "hollow ring". The distance between the green paint printed on the outer panel and the holes is also called Clearance. However, due to the increasing density of the circuit board, the original space of the green paint has been squeezed to almost nothing.
label:
Clearance