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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