Method and apparatus for the inspection of defects

Details Method and apparatus for the inspection of defects Method and apparatus for the inspection of defects

1991-05-24

1994-03-08

Rosenberger, Richard A.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356239, G01N 2147

Patent

active

052935388

ABSTRACT:
A defect inspection method and apparatus detect a defect which exists on the surface of a protection layer or a defect which exists in the protection layer and scatters the light on its surface, through the detection of the light which is derived from an illumination light and reflected on the protection layer surface and the light which is derived from a slit-formed illumination light and scattered in the area between the position where the light is incident to the transparent protection layer and the position where the surface of an element underneath the transparent protection layer is illuminated. An image process, which images two elements having the same appearance and compares the images, thereby to reduce inconsistent components emerging in portions other than a defective portion, is conducted through imaging under the bright field illumination and bright/dark field combined illumination, and the images are rendered the minimum filtering process based on 3-by-3 pixels and the defect judgement process based on comparison.

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patent: 4669875 (1987-06-01), Shiba et al.
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patent: 4674875 (1987-06-01), Koizumi
patent: 4740079 (1988-04-01), Koizumi et al.
patent: 4886975 (1989-12-01), Murakami et al.
patent: 5162642 (1992-11-01), Akamatsu et al.

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