Method of and apparatus for inspecting conductive pattern on pri

Details Method of and apparatus for inspecting conductive pattern on pri Method of and apparatus for inspecting conductive pattern on pri

1991-03-22

1992-09-22

Couso, Jose

Image analysis

Histogram processing

For setting a threshold

382 25, 358101, 358106, 358107, 364559, G06K 900

Patent

active

051504227

ABSTRACT:
A printed circuit board (11) is provided with a conductive pattern (P, R) and a through hole (H) thereon. Respective images of the conductive pattern and a through hole are photoelectrically read with an image reader (20). The conductive pattern image is magnified in size to obtain a magnified pattern image (PI.sub.m), while the hole image is magnified at different magnification factors to obtain magnified hole images (HI.sub.n, HI.sub.n-i). A ring image (RP) is defined by the difference of the magnified hole images. The overlapped region (WR) on which the ring image and the magnified pattern image overlap each other is then calculated, and a defect or an opening of the conductive pattern is detected by calculating the aperture angle (.theta.) of the overlapped image.

REFERENCES:
patent: 4589140 (1986-05-01), Bishop et al.
patent: 4661984 (1987-04-01), Bentley
patent: 4797939 (1989-01-01), Hoki et al.
patent: 5015097 (1991-05-01), Nomoto et al.
patent: 5027417 (1991-06-01), Kitakado et al.

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