Many flex houses deal with just flex, not membrane/flat switch
assemblies, which is what your customer may be refering to. But an SMD
part(s) with polyimide film flex would likely work out nicely, might be
less expensive too.
Also, had anyone contacted a membrane switch mfgr? If there were
multiple switches, this might work out too. This may be a pricey
proposition, depending on quantity, size, layer count, etc.
Roger
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of mattyk
Sent: Tuesday, January 15, 2008 3:05 PM
To: [log in to unmask]
Subject: Re: [TN] Polyester Dome Switch on Flex Circuit.
Yes we need details as to construction and assembly. Our customer put us
in charge in figuring out how they're done, all they said is, we want to
use a polyester dome switch. The flex house came back with, if you gave
us a part number we'd be able to help out more. The more I look into it,
I think the best way is to use a part in the stiffener section, and
we'll just have to leave a copper pattern for it to be soldered too. If
that is how part type ones are done that is. I think this way is better
than having it built into the graphic layers and using spacers and such.
-----Original Message-----
From: Roger Stoops [mailto:[log in to unmask]]
Sent: Tuesday, January 15, 2008 12:07 PM
To: TechNet E-Mail Forum; mattyk
Subject: RE: [TN] Polyester Dome Switch on Flex Circuit.
The domes may be integrated into the graphics layer, or installed
underneath the graphics layer, depending on how expensive an assembly
you want. Dome has to be stiffer mat'l, depending on snap action/tactile
feel required.
Graphics layer might possibly be a cover layer, no graphics, with dome
underneath, once again, how many $$. Will probably also need a
stiffener under the switch, or needs to be secured to a stiff or hard
surface. No flexing in switch area allowed.
Are you curious about how they are implemented, or do you need details
as to construction/assembly? Flex house should be able to provide more
specific details.
Roger
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of mattyk
Sent: Tuesday, January 15, 2008 10:44 AM
To: [log in to unmask]
Subject: [TN] Polyester Dome Switch on Flex Circuit.
We have a customer requesting a polyester dome switch on a flex circuit.
I have questions out to our Flex Fab vendors, but thought I'd also ask
here.
Are these done during the fabrication process? Will the vendors fab
these in? Or are they installed after? How do these effect the standard
flex circuit materials? The flex circuits in question intended use is
Continuous Flex. I've found mfg's of these switchs, though am having
trouble finding how they are implemented.
Thanks in advance for any assistance.
Matt Kennedy
SBS Pads
Sr. PCB Designer C.I.D.
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