Deep blind vias, i.e. blind vias connecting the surface circuit to circuit layers deeper than the first buried circuit layer

Full Title

Indexing scheme relating to printed circuits covered by H05K1/00 > Shape and layout > Shape and layout details of conductors > Conductive through-holes or vias > Blind vias, i.e. vias having one side closed > Deep blind vias, i.e. blind vias connecting the surface circuit to circuit layers deeper than the first buried circuit layer