[AR] Re: "How Hard Can It Be" rocket episode
- From: Henry Spencer <henry@xxxxxxxxxxxxxxx>
- To: Arocket List <arocket@xxxxxxxxxxxxx>
- Date: Wed, 20 Nov 2013 17:23:46 -0500 (EST)
On Wed, 20 Nov 2013 johndom@xxxxxxxxx wrote:
> Thin flexible multilayer PCBs are available since the seventies. Applied in
> most NATO jets circuitry. Allow for 90° bends. Mylar I think...
Versions with only one or two layers are also frequently used as flexible
interconnects, e.g. between printer and moving print-head or between
laptop body and screen.
> So I wonder if flex ones crack too.
Yes, they can crack, if flexed too often. The one connecting the body
and screen of the Psion Series 5 (which was either a super-palmtop or an
ultra-mini-laptop, depending on your viewpoint :-) ) was a notorious
failure point on that otherwise-durable machine, partly because of an
ill-placed tooling hole that cracks often started at.
Henry Spencer
henry@xxxxxxxxxxxxxxx
(hspencer@xxxxxxxxxxxxx)
(regexpguy@xxxxxxxxx)
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