Mail Archives: geda-user/2016/01/06/09:19:16
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On Jan 6, 2016, at 8:54 AM, Nicklas Karlsson =
(nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] =
<geda-user AT delorie DOT com> wrote:
>> For this pcb non-user, one of the biggest sources of confusion that =
drives me away is that pcb does not really have layers at its =
foundation.
>>=20
>> I think of a printed circuit board as a stack of patterned layers of =
various materials: epoxy glass, constantan, copper, teflon, solder mask, =
etc. Plated holes are an exception to the general paradigm, but I think =
they=92re the only one unless you=92re into 3D printing.
>>=20
>> =46rom that point of view, a simple buried via is a piece of copper =
with a hole in it on one layer, a plated hole in the insulating layer =
below it, and a piece of copper with a hole in it on the next layer =
down. ...
>=20
>=20
> I think of layout data as a bunch on drawing primitives drawn on =
different layers,
Which presumes a model of layers to start from.
> everything else is just structure to make handling easier.
>=20
> Some data or drawing primitives are bunched together in something =
called a footprint so it could be manipulated all at once.
>=20
> If it where possible to bunch together the ordinary drawing primitives =
including drilled plated or not holes in something called a via it would =
be no problem to draw buried vias?
Yes. But part of the reason pcb can=92t do this is that it doesn=92t =
model all of the layers in a consistent way, especially the insulating =
ones.
>=20
>=20
> Nicklas Karlsson
>=20
John Doty Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com
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