| 摘要 |
PURPOSE:To prevent an internal short-circuiting after lamination from occurring by detecting residual copper without foil by performing electrical inspection utilizing an adapter board with a surface and rear-surface continuity part and a through hole for an inner-layer power supply ground layer. CONSTITUTION:A clearance part 3 is provided on an axis A 10 of an inner-layer power supply ground layer 1 and a surface and rear-surface continuity part by copper 9 is provided on the axis A 10 and a through hole 6 is provided on an axis B 11 of a conductor layer 2 and then the area of a contact part of a continuity part 5 is reduced to be smaller than that of the clearance part 3. Then, when performing inspection, a probe pin 7a, the conductor part 5, and the clearance part 3 contact one another, while a probe pin 7b contacts the conductor layer 2. When there is no remaining copper in the clearance part 3, there is no continuity since the pin 7a and the pin 7b are electrically insulated. However, when there is a remaining copper at the clearance part 3, the pin 7a and the pin 7b are electrically connected, thus obtaining continuity and detecting defect. |
