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-----Original Message-----
From: Ray Humphrey [mailto:[log in to unmask]]
Sent: Saturday, March 31, 2001 11:47 AM
To: [log in to unmask]
Subject: [DC] Blind and Buried Vias


In a recent posting, Your Opinoin Needed - Designers Learning Symposium, I
notice that blind and buried vias were included in the 'newer technologies'
category.  I also find that most designers are reluctant to use blind and/or
buried vias, for various reasons.  Blind and buried vias have been around
for over a decade, they are not new.  I have a great article from the March
1988 issue of PCD magazine talking about the use of blind and buried vias
down to 2 mils in size!  I am frustrated that PCB fabricators are failing to
keep up with the industry they support and continue to charge excessive
prices for such an old process.  Much of today's technology require the use
of blind and/or buried vias - I say it is time for designers to get over
their paranoia and for fabricators to stop taking advantage of it!

Several days ago, I posted this question to the DC forum, "Could someone
please give me a general guideline concerning the additional cost of using
blind vias on a PCB?  Perhaps there is someone out there in the PCB
fabrication business or a fellow designer that has done some extensive
research into this?"  To date, I have not received a single response.

Isn't it time we stopped considering blind and buried vias as a 'new
technology'?

Just my rant - I feel better, now.  :)

Ray

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