Electricity: measuring and testing – Plural – automatically sequential tests
Patent
1984-12-24
1987-09-08
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Plural, automatically sequential tests
324158R, 356394, 356398, 358101, 358106, G01R 3102
Patent
active
046926909
ABSTRACT:
A pattern detecting apparatus for inspecting a printed wiring board is disclosed in which a fluorescent image formed by the fluorescent light from the substrate of the printed wiring board and an image formed by the reflected light from the wiring pattern of the printed wiring board are both used because a wiring material which is left on an undesired portion of the substrate and has low reflectivity, is detected only at the fluorescent image and a defective portion of the wiring pattern where a surface layer thereof peels off, is detected only at the image formed by the reflected light, the image used for detecting the above defective portion is preferably formed by the reflected infrared light from the wiring pattern for the reason that infrared light is insensitive to a shallow flaw in the surface of the wiring pattern, and the fluorescent image and the infrared image are processed by a detection circuit, and then compared with each other to detect a pattern defect on the basis of a difference between the images thus processed.
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"A Digital Video Image Processor for Real-Time X-Ray Subtraction Imaging", by Kruger et al., Optical Engineering, 12/78, vol. 17, #6,358-111, pp. 652-657.
Hara Yasuhiko
Karasaki Koichi
Sase Akira
Ujiie Noriaki
Burns W.
Eisenzopf Reinhard J.
Hitachi , Ltd.
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