| 摘要 |
<p>PROBLEM TO BE SOLVED: To remarkably reduce design manday of a circuit and quickly cope with design change. SOLUTION: This circuit forming structure uses a printed circuit board 1. On one side 2b and the other side 2a of an insulating board 2 of the printed circuit board 1, copper foil patterns b-1 to b-14, and copper foil patterns a-1 to a-29 which stretch straight in the longitudinal direction and the transversal direction are formed, respectively. This board is used as a common printed circuit board. Necessary circuits are left on the surfaces 2b and 2a, and through holes a-h are formed in intersecting parts of each circuit by etching and pressing with a cutting tooth. As a result, necessary circuits are formed on the respective surfaces 2b, 2a of the insulating board 2, and the circuits on the respective surfaces 2b, 2b are electrically connected.</p> |
