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From: phil@pepsi.amd.com (Phil Ngai)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Layered M/B ?
Message-ID: <1990Jun5.202650.23834@bach.amd.com>
Date: 5 Jun 90 20:26:50 GMT
References: <6761@ucrmath.ucr.edu> <509@vidiot.UUCP>
Sender: usenet@bach.amd.com (NNTP Posting)
Organization: Advanced Micro Devices; Sunnyvale, CA
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In article <509@vidiot.UUCP> brown@vidiot.UUCP (Vidiot) writes:
|Every double-sided board is considered as having two layers.  A four layer
|board has two more layers inside the board.  Consider it as a sandwich.
|A four layer board will have three pieces of board glued together.  A four

Actually, I think of a four-layer board as two two-layer boards glued
together. You would understand this if you realized that two-layer
boards are two sheets of copper glued together. Although your
description (three pieces of board) isn't completely wrong, it
does give the impression that during assembly, the center part is
a rigid object that is glued in when really it is some floppy glass
fabric impregnated with goopy epoxy.


--
Phil Ngai, phil@amd.com		{uunet,decwrl,ucbvax}!amdcad!phil
"Separate but equal": bad for blacks, good for women.