A system (1) has a projection lens (12) directing on-axis light and low level LEDs (18) directing light to blind microvias (5). A high resolution camera (14) captures blind microvia images and an image processor recognises defects according to classifications (54-59) according to reflected light area and centroid position. The lens (12) is telecentric for particularly effective image capture in blind microvias (5). The system also has an array of 6000 back lighting LEDs (10) providing illumination for capture of images by a camera (15). These images are analysed by the image processor to detect defects such as blocked through microvias.
申请公布号
WO0070360(A1)
申请公布日期
2000.11.23
申请号
WO2000IE00061
申请日期
2000.05.11
申请人
MV RESEARCH LIMITED;BOYLE, ADRIAN;CONLON, PETER;DORR, NIALL;MAHON, JAMES;OWEN, MARK
发明人
BOYLE, ADRIAN;CONLON, PETER;DORR, NIALL;MAHON, JAMES;OWEN, MARK