Automatic optical inspection of plated through-holes for ultrahigh density printed wiring boards |
| |
Authors: | Moritoshi Ando Takefumi Inagaki |
| |
Affiliation: | (1) Fujitsu Laboratories Ltd. 10-1, Wakamiya, Morinosato, 243-01 Atsugi, Japan |
| |
Abstract: | An automatic optical through-hole inspection system for ultrahigh density printed wiring boards (PWBs) using leakage light detection has been developed. To detect the dim leakage light emitted from the through-hole defect, we enhanced the sensitivity of the light detector 150 times using a microchannel plate tube. However, the tube caused two problems: stray light sensing and image distortion. To solve these problems, we optically isolated the sensing optics and developed a distortion correction method. We have developed a prototype system that can detect a defect as small as 100 m. |
| |
Keywords: | inspection printed wiring board through-hole optics automation |
本文献已被 SpringerLink 等数据库收录! |