[PCB_FORUM] Re: Carbon Switch PCB Pattern Design Guides
- From: "Vince Di Lello" <vince.dilello@xxxxxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Mon, 16 May 2005 05:37:20 -0700
Kevin, that is exactly what my thought's are, but due to the fact that
we are using a sub to work out the front panel details who in turn is
subbing out the custom switch design while we are responsible for the
PCB, the lines of communications is not as open as I am used to.
Therefore, I was jut trying to get an idea as to what others have used
so that we at least had "some sort of" pattern on the PCB (in the space
allotted) so that we could proceed with the board design while awaiting
the proper info from the switch designer. Thanks again to all for
contributing ... I greatly appreciate all your responses.
Vincent Di Lello, CID+
Senior CAD Designer
Kaleidescape Canada, Inc.
vdilello@xxxxxxxxxxxxxxxx
(v) 519.772.6418
(f) 519.772.6401
www.kaleidescape.com
-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Kevin McCowan
Sent: Monday, May 16, 2005 8:09 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Carbon Switch PCB Pattern Design Guides
Why don't you just use what the switch manufacturer
suggests? I can't imagine that they wouldn't have this all
worked out for you already. Once you have the pattern
for the particular switch ask the bare board house
if there is any magic necessary to make it work.
That's what I'd do, anyway.
Kevin McCowan
Sr. PCB Designer
TSI Telsys
Mike Finczak wrote:
> Vincent,
> Attached is a screen shot of some gold plated copper
switch
> patterns.
> The line width and space on the fingers is 20 thou.
>
> For carbon ink deposited on copper, the copper finger
width
> is 32 thou
> with 8 space thou between fingers. The carbon ink width
is
> 16 thou with
> a 24 thou space between the carbon fingers.
>
>
> It's also possible to deposit carbon ink directly on FR4,
> but I don't know
> anything about the longevity of that configuration.
>
>
> These numbers may be a few years out of date, so check
with
> your board
> shop for recommended dimensions.
>
>
> Regards,
> Mike Finczak
> CopperCAD Design
> www.CopperCAD.com <http://www.CopperCAD.com>
> 905-488-8958
>
> -----Original Message-----
> *From:* icu-pcb-forum-bounce@xxxxxxxxxxxxx
> [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] *On Behalf Of *Vince
Di
> Lello
> *Sent:* May 13, 2005 2:49 PM
> *To:* icu-pcb-forum@xxxxxxxxxxxxx
> *Subject:* [PCB_FORUM] Carbon Switch PCB Pattern Design Guides
>
> Good afternoon once again fellow designers .... Things sure happen
on
> Friday's ..... does anyone have any design guideline documents
> regarding acceptable PCB patterns (specifically minimum trace &
> space) for carbon or rubber switches? Please and thanks .....
>
>
>
> Vincent Di Lello, CID+
>
> Senior CAD Designer
>
> Kaleidescape Canada, Inc.
>
> vdilello@xxxxxxxxxxxxxxxx <mailto:vdilello@xxxxxxxxxxxxxxxx>
>
> (v) 519.772.6418
>
> (f) 519.772.6401
>
> (c) 519.835.4477
>
> www.kaleidescape.com <http://www.kaleidescape.com>
>
>
>
>
>
>
>
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>
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