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> pwtpcbs.com > Glossary of PCB terms
Aperture:
A description of the shape and size of the tool used to create a pad or track.
The term comes from the days of vector photoplotters, where film was exposed by shining light through apertures (shaped holes) arrayed around the edge of a disk (or "aperture wheel").
Each aperture corresponded to a different D code in the Gerber data. Today, photoplotters use lasers to expose the film but the term "aperture" persists.
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