Scaling Artwork BASICS

摘要

Does this sound familiar? In our company, we deal with so many exotic materials and unusual constructions, the usual approaches to registration - especially scaling artwork - don't apply. Even the materials themselves are completely different from one batch to another. There are two distinct and unrelated categories of registration error: size and shift. Size is the final size of a specific layer/core/panel after fabrication is complete. Size is affected by several factors, especially shrinkage (or expansion) of the core/prepreg materials during etch and lamination. It is controlled by scaling the artwork to compensate for this anticipated shrinkage (expansion). Such scaling is typically done on a core-specific basis; that is, for a given core, such as Apco polyimide, 0.004", 1 over 1, with 2113 glass, there will be a specific scale factor.