CCD-world: Help on Flexible PC suppliers?

[Flemming, John C]

The following was posted to CCD-world:

Note the mispelling. Sheldahl is alive and well   Acess via any search
engine will work.

> -----Original Message-----
> From:	Tom Droege [SMTP:droege at wwa.com]
> Sent:	Friday, January 21, 2000 6:27 PM
> To:	CCD-world at astro.ku.dk
> Subject:	Re: CCD-world: Help on Flexible PC suppliers?
> 
> The following was posted to CCD-world:
> 
> The supplier of "last resort" in the US in my experience (Fermilab) has
> been a company I remember as "Shieldal" in MN.  Sorry I could not find
> them
> in a 10 min web search.  They would make circuit boards no one else would
> touch.  I will search more if you do not find a supplier.  they made long
> Kapton cables for us.  Not cheap.
> 
> They have probably been bought out by someone.
> 
> Tom Droege 
> 
> At 04:46 PM 1/21/00 +1100, you wrote:
> >The following was posted to CCD-world:
> >
> >
> >Dear CCD-World gurus,
> >
> >we have recently found at the AAO that our 
> >instruments are moving into areas where our
> >current flexible PCB suppliers can no longer
> >be relied on.
> >
> >Can we get some recomendations on people's
> >preferred flexible PCB suppliers? A
> >detailed specification of our requirements is
> >attached, however to summarise.
> >
> >* Flexible PCB - only millimetre motions at most
> >  after installation.
> >* Use in vacuum and temps at least 77K
> >* Polyimide and teflon have been OK in past
> >*** Low capacitance!!
> >* Sizes from 80mm x 150mm up to 60mm x 400mm
> >
> >Thanks in advance,
> >
> >Chris T.
> >
> >> 
> >> 
> >> Dear Sir/Madam,
> >>
> >> 		for my current project I require approximately
> >> 18 different flexible printed circuits, possibly panelised 
> >> into 4 or 6 groups depending on your available panel sizes.
> >> 
> >> 	These flex circuit will be used to replace wiring within
> >> a cryogenic camera, the boards have no components on them 
> >> except for a connector at each end, where stiffeners are 
> >> required. The circuit will not be flexed continuously just 
> >> shaped initially then only a few millimetres movement will 
> >> be required infrequently. The flex material must be 
> >> suitable for use in a vacuum and at low temperature (we 
> >> have tested polyimide and teflon material at our operating 
> >> temperature and found both acceptable).
> >> 
> >> 	The most important of our requirements is low capacitance.
> >> Therefore the base material we prefer is 0.005" teflon with 
> >> a dielectric constant (Dk) < 2.5, however other 0.005" base 
> >> materials may be suitable such as Kapton KN (R/Flex2001) 
> >> with a Dk = 3.2 or polyester (Dk = 3.1) although we have 
> >> not verified polyester at our operating temperature.
> >> 
> >> The sizes of each flex range from 80mm x 150mm up to 60mm x
> >> 400mm. 
> >> 
> >> General specifications for the flex circuits:
> >> 
> >> 1.  Double sided copper with plated through holes.
> >>     1oz finished copper weight.
> >> 
> >> 2.  Track width 0.006", spacing >0.010".
> >>     Solid or 45 deg. cross hatched ground plane on one side.
> >> 
> >> 3.  Hole sizes >0.020", annulus >0.010".
> >>     Aprox. 50 holes per board.
> >> 
> >> 4.  Insulating layer or solder resist both sides.
> >> 
> >> 5.  0.005" stiffener over the ends (1 side) approx. 15mm 
> >> long.
> >> 
> >> 6.  No silkscreen.
> >> 
> >> 7.  Silver (preferred) or solder finish on pads.
> >> 
> >> 8.  Protel CAD files or Gerber files available for 
> >> manufacturing.
> >> 
> >> 9.  Quantity will be 2 or 3 each of the 4 or 6 panels (18 
> >> types) initially.
> >> 
> >> 	I believe these designs are not unusual and should 
> >> not present any manufacturing problems apart from the 
> >> selection of base material. Please let me know what 
> >> suitable low Dk base materials you have available and 
> >> rough idea of pricing for the production of these flex 
> >> circuits. I also need your panel sizes and manufacturing 
> >> time.
> >> 
> >> ----------------------
> >> Lewis Waller
> >> Anglo-Australian Observatory               Email: lgw at aaoepp.aao.gov.au
> >> PO Box 296, Epping. NSW 2121               Tel:   61 2 93724831
> >> 167 Vimiera Road, Eastwood. NSW 2122       Fax:   61 2 93724880
> >> Australia
> >> 
> >> 
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> >
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> Standard replies will go to the list; address personal replies manually.
> For more information, please go to:  http://www.not.iac.es/CCD-world/
- -- CCD-world -- --
CCD-world is fully moderated. Send posts to CCD-world at astro.ku.dk
Standard replies will go to the list; address personal replies manually.
For more information, please go to:  http://www.not.iac.es/CCD-world/