| 摘要 |
PURPOSE:To check the partial defect of a part to be checked automatically, instantaneously, and inexpensively, by providing a light injecting device at one side of a material to be checked, which does not transmit light and is mounted on a moving stage, and providing a light detecting device and a defect displaying device on the other side. CONSTITUTION:A throuhole 9 of a printed board 2, which is to be checked is positioned at the part directly below a light detecting device 6. The printed board 2 is mounted on an X-Y moving stage 15. The light detecting device 6 is lowered by a piston 10. The light injected from a light injecting device 4 into an insulating plate 3 is propagated to a plated part 9a. If a poorly plated part 8 is present, the light passes through the part 8 and captured by the light detecting device 6. The amount of light is displayed by a defect display device 13. Therefore, even though there is a partial defective part, the defective part is automatically checked in a short time, and the cost of the device becomes inexpensive. |
