| 摘要 |
PURPOSE:To increase the reliability of the discrimination of whether a carbon printing operation is good or not in a printed wiring board wherein prescribed circuit patterns are connected by using a carbon conductor. CONSTITUTION:Through holes 13, 13 are made in two places in a board 1a; lands 11a, 11b 12a, 12b which are set to a continuity state by means of conductive materials 14 inside said through holes are formed on both the surface and the rear; a carbon conductor 15 is printed across the lands 11a, 12a on one side of the board; probes 7a, 7b are brought into contact with the lands 11b, 12b on the other side of the board; the resistance value of the carbon conductor 15 is detected via the lands. Even when the contact place of the probes 7a, 7b is different, a measured value is not changed sharply, and the high-reliability inspection of a carbon printer operation can be executed. |
