| 摘要 |
PURPOSE:To improve the precision and efficiency of inspection by inspecting residual copper and an abnormal part by mounting an insulating thin plate, having opening holes except at circuits on an internal layer material, at a prescribed position, and then bringing terminal sides of a connector having many terminals into contact with the plate. CONSTITUTION:On an internal layer material 2 such as a copper lamination plate, etc., having electric circuits 1, an insulating thin plate 4 of a sheet of polyvinyl chloride resin, etc., having opening holes 3 except at the circuits is mounted at a prescribed position, and the terminal sides of a connector 6 having many terminals 5 is brought into contact with the insulating thin plate 4. Then, if residual copper or foreign matter such as a whisker and a burr resides on a part other than the circuits, a short circuit is formed, thereby knowing abnormality by the lighting of a lamp 7 and the sounding of a signal tone generator 8 such as a buzzer, a bell, etc. This method inspects an internal layer circuit not visually, but electrically, so that the precision and performance of the inspection are improved remarkably. |
