Cognex In-Sight 1721, User Manual

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1721/1722 Wafer Reader Installation Options In-Sight
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1700 Series Wafer Reader
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Image Artifacts
Under certain conditions, horizontal lines may be observed in the image (Figure D-5).
These lines are artifacts of the wafer reader’s optical design. They are most visible at a
working distance of approximately 30.0mm, when the Light Mode setting is Dark Field
(for more information of Light Modes, see Section 3.5.10). In most cases, these lines will
have no impact on reading performance. If desired, position the mark in an area of the
field of view that is free of artifacts. To reduce the intensity of the lines, the lighting can be
optimized using the automated tuning process (Section 3.5.16).
Figure D-5: Image Artifact Example