Illumination method and device for detecting surface defects...

Details Illumination method and device for detecting surface defects... Illumination method and device for detecting surface defects...

2003-10-24

2008-08-26

Lauchman, L. G. (Department: 2877)

Optics: measuring and testing

Inspection of flaws or impurities

Containers or enclosures

C356S237100, C356S239700, C356S239400, C250S22300B

Reexamination Certificate

active

07417725

ABSTRACT:
In an optical method for determining surface defects and/or material shortage on the neck ring (3) of a container having an axis of symmetry (X) comprises illuminating the surface(s) of the neck ring (3) of the container with an incident light beam, a uniform ring of light (C) is obtained that converges towards a point of convergence located on the axis of symmetry (X) of the container with a variable diameter (D) and/or variable width (E). The diameter (D) of the convergent ring of light (C) at a given value in relation to a desired mean angle of incidence (α) to illuminate the surface of the neck ring (3) of the container and/or the width (E) of the convergent uniform ring of light (C) at a given value in relation to the width (L) of surface of the neck ring (3) of the container are selected.

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