| 摘要 |
A circuit board is provided to especially improve productivity as compared with generation of an opening by a router bit by forming an opening by a punching process. An opening(3) is formed in a circuit board. A dummy electrode pattern(1) connected to the circumferential edge of an arc of the opening is installed in addition to an interconnection pattern(2) connected to the circumferential edge of the opening. The dummy electrode pattern can be made of branch patterns periodically connected to the circumferential edge of the arc of the opening. |
