LAND STRUCTURE OF PRINTED BOARD

摘要

PURPOSE:To simply sight and bore a through hole on a land even having shapes other than a circle by providing a center indicator showing the center of a non-circular land in a drill puncher with a projecting scope. CONSTITUTION:A center indicator 2 showing the center of a land formed in a square shape is indicated by painting out in a circular shape or the like. The center of the rectangular land 1 can be simply matched to the indicator 9 on the projector screen of a drill puncher by using this indicator 2.