hi,
don't know if this is applicable, but i've seen a screen mesh used as a
shield, in placed of continuous copper, to allow improved adhesion of
solder mask and conformal coating without impacting the performance of
an electrical plane.
phil
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Friday, July 29, 2005 1:51 PM
To: [log in to unmask]
Subject: Re: [TN] Checkerboard pattern on the outer layers...
I have also seen a mesh pattern used in place of a large ground plane.
It reduces the thermal load during wave soldering. But this would not
be a checkerboard pattern.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush
Sent: Friday, July 29, 2005 4:01 PM
To: [log in to unmask]
Subject: Re: [TN] Checkerboard pattern on the outer layers...
This is for plating distribution. Outboard thieving is OK (Panel,
Pallet, etc), but in-board thief needs to be approved by the designer
and should not be added without approval. Many designers allow this
either in there PCB spec of master drawing, but an approval is needed as
many designs are sensitive to extraneous metal.
Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED
76 Technology Drive - POB 1890
Brattleboro, Vermont 05302
Voice: 802.257.4571.21 Fax: 802.257.0011
http://www.vtcircuits.com
-----Original Message-----
From: Stephen Gregory [mailto:[log in to unmask]]
Sent: Friday, July 29, 2005 3:47 PM
To: [log in to unmask]
Subject: [TN] Checkerboard pattern on the outer layers...
Hi All!
Well, another week is just about to wind-down...YAY!
I have a dumb question. When a checkerboard pattern is put on an outer
layer of a PCB where there's nothing else, is that called a "copper
pour"? It's used to help etching isn't it?
One other question about that checkerboard pattern (whatever it's
called), a fab house shouldn't just do that without asking, right?
Kind regards,
-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
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