MULTI-ROW TYPE PRINTED CIRCUIT BOARD AND MANUFACTURING METHOD THEREOF

PROBLEM TO BE SOLVED: To provide a multi-row type printed circuit board and a manufacturing method thereof that has an opening portion of a substantially oval or substantially rectangular opening shape in a unit product part and which is excellent in processing precision of a non-rectangular outer shape of the unit product part, has no deterioration of quality, and can be formed with high production efficiency with a reduced cost.SOLUTION: A multi-row type printed circuit board includes a first opening 2 whose opening shape is substantially oval or roughly rectangular, a via hole 3 having a circular opening shape, a unit product part 1n having an outer shape 4 formed in a non-square shape, a second opening 5 forming the outer shape of the unit product part, and a connecting part 6 connecting the adjacent unit product parts, and the unit product parts are arranged in a large number so as to be connected in a matrix form by the connecting part, and an inner wall surface of the first opening and an inner wall surface of the second opening have a blasting surface.SELECTED DRAWING: Figure 1 【課題】単位製品部における開口形状が略長円又は略矩形の開口部と、単位製品部の非四角形状の外形の加工精度がよく、品質の劣化がなく、コストを抑えて生産効率よく形成することの可能な多列型プリント基板とその製造方法の提供。【解決手段】開口形状が略長円又は略矩形の第１の開口部２と開口形状が円形のビアホール３を有し、外形４が非四角形状に形成された単位製品部１ｎと、単位製品部の外形を形成する第２の開口部５と、隣り合う単位製品部を連結する連結部６とを有し、単位製品部が連結部によりマトリックス状に連結されて多数配列された多列型プリント基板であって、第１の開口部の内壁面と、第２の開口部の内壁面がブラスト加工面を有する。【選択図】図１