THROUGH HOLE INSPECTING METHOD AND DEVICE

摘要

A through hole inspecting method and device for inspecting a through hole at low cost with good precision. A light source and a sensor camera having imaging devices are provided on both sides of a table where a work having a through hole is placed. The light emerging from the through hole is captured by the sensor camera. The focal position of the sensor camera is shifted from the surface of the work to apparently enlarging the area for capturing the light emerging from the through hole.