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Question about VIA overhang.

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Woomos

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Hi, I had a question about VIA overhang while I was studying.

I know that VIA overhang is a parameter that is set to improve the yield of VIA.
When drilling VIA in the process, it makes sense to apply an overhang to the upper layer because the shape of the VIA becomes trapezoidal.
However, I did not understand why the overhang is applied to the lower layer as well.

Any comments or information would be appreciated.
Thank you for read.
 

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