Paul,
That is sooo BAD - and so good! :)
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Reid
Sent: Friday, May 02, 2008 2:23 PM
To: [log in to unmask]
Subject: Re: [TN] Voids in internal PCB microvias
Hi Bev,
Backfire ... by all means.
Your subject line says "Voids in internal PCB microvias"
Your customer wants to know the composition of a void in a buried
microvia.
I think what you have posted is a PCB koan. A classic koan by Hakuin is
"You know the sound of two hands clapping. What is the sound of one hand
clapping"
PCB koan - "You know the composition of what fills a filled microvia.
What is the composition of what fills a voided microvia?"
The important part of the microvia is the part where there is no
microvia because that's the part that contains the void.
This is the yin and yang of the what is, and what is not, in a microvia.
Grasshopper, this is the Tao of PCBs.
Paul Reid, PCB Inc.
PS. I would just look at the RIM of the void.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Friday, May 02, 2008 12:54 PM
To: [log in to unmask]
Subject: [TN] Voids in internal PCB microvias
TechNetters,
I have a customer who wants to know the composition of any materials (if
any) inside copper plated internal microvias. Obviously traditional
x-sectioning would lead to contamination by the x-sectioning process.
Someone suggested laser cutting, but that is ridiculous, for the same
reason. Someone else suggested FIB, but this is fiendishly expensive,
especially for the kind of depth of cut we might be talking about here.
Any and all non-Friday afternoon suggestions welcome.
(This last statement will probably backfire on me!) Bev RIM
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