LISTSERV - DESIGNERCOUNCIL Archives

DESIGNERCOUNCIL Archives

December 2003

DesignerCouncil@IPC.ORG

	LISTSERV Archives
	DESIGNERCOUNCIL Home
	DESIGNERCOUNCIL December 2003

	Log In
	Register

	Subscribe or Unsubscribe

	Search Archives

Options:	Use Monospaced Font Show Text Part by Default Show All Mail Headers
Message:	[<< First] [< Prev] [Next >] [Last >>]
Topic:	[<< First] [< Prev] [Next >] [Last >>]
Author:	[<< First] [< Prev] [Next >] [Last >>]

Subject:	Re: Layer to layer registration
From:	Chris Robertson <[log in to unmask]>
Reply To:	Chris Robertson <[log in to unmask]>
Date:	Wed, 10 Dec 2003 10:09:29 -0600
Content-Type:	text/plain
Parts/Attachments:	text/plain (70 lines)

Steve,
Just to throw in my 2Cents here. Never specify layer to layer registration.
It should always be layer to TOP layer registration.
Same with the drill. The Drill should be referenced to the top layer.
(or bottom, Pick one)
Why?
If you reference one layer to another, it becomes cumulative.

The manufacturer annular ring is composed of 3 values.
Drill, Layer registration, and image.
Conventional technology (the lowest) consists of .003" per.
Drill .003"
layer .003"
Image .003"
_________________
Min AR = .009"

As you can see, the layer registration should be no more then .003" from your
reference layer (top or bottom).
Throughout the higher technologies the layer registration is still one of the weak points,
so I wouldn't specify less then .003", unless your manufacturer indicates they can do better.

Chris Robertson
Author "PCB Designer's Reference"
[log in to unmask]
ISBN: 0130674818
Search for it at www.amazon.com

----- Original Message -----
From: Steve Smith
To: [log in to unmask]
Sent: Wednesday, December 10, 2003 9:54 AM
Subject: [DC] Layer to layer registration

Hi,

I am forwarding the question from Katherine Trost of Panduit:

Do you have any recommendation for specifying layer to layer
registration? We are creating capacitance with finger and pad
capacitors on inner layers and I need to specify that the registration
be +/- .005 from one layer to the next, non- cumulative.

Thanks,
Steve Smith C.I.D.
Product Engineer

Staco Energy Products Co.
Web Site: www.stacoenergy.com
& www.stacopower.com

---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------

ATOM RSS1 RSS2

LISTSERV.IPC.ORG