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November 1999

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Subject:
Re: AOI equipment
From:
Evan Durant <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 22 Nov 1999 09:12:22 -0800
Content-Type:
text/plain
Parts/Attachments:
text/plain (232 lines) 
Connie,

Yes, a laser-based fluorescence AOI machine can be used to detect excess (or
missing) resist after develop.  Arguably, however, you could use a
reflective system to do the same thing, since resist scum should tend to
block reflective light.  My own experience has been that the fluorescence
systems work better for this particular application, though.

> -----Original Message-----
> From: Huffman Connie Civ WRALC/LYPME [SMTP:[log in to unmask]]
> Sent: Monday, November 22, 1999 3:37 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] AOI equipment
>
> Hello Evan,
> Could you please tell more about the fluorescence machine?  Is this the
> instrument that can be used to detect resist scum on a panel prior to
> etching?
> Many thanks,
> Connie
>
> > -----Original Message-----
> > From: Evan Durant [SMTP:[log in to unmask]]
> > Sent: Sunday, November 21, 1999 02:12
> > To:   [log in to unmask]
> > Subject:      Re: [TN] AOI equipment
> >
> > Hello Ed,
> >
> > First of all, whose double treat are you using?  Some foils are a bit
> more
> > AOI friendly than others.  I've dealt with double treat surfaces that
> > range
> > from a sort of pumpkin orange to a chocolate brown, with the lighter
> > surfaces being easier to deal with.  Depending on who your supplier is,
> > you
> > might be surprised how helpful they can be.
> >
> > You mentioned the diffusion filters, so I take it you're already aware
> of
> > the fact that they must be removed when inspecting low reflectivity
> > surfaces
> > (double treat, reverse treat).  This alone makes a world of difference.
> >
> > As far as fine line inspection, this will certainly be problematic with
> > reflective systems.  However, your best bet is running at as high a
> > resolution as practical (beyond what the manufacturer recommends).
> > Having
> > the highest possible number of pixels across the top surface of the
> trace
> > will provide more reliable line gaging, which will lead to more accurate
> > recognition of features, which will lead to fewer false defect calls.
> > Depending on which systems you have, you can probably go down as low as
> > 0.2
> > mil.  Of course the trade off is that you'll run slower, but you'll also
> > find collateral benefits in improved defect detection.
> >
> > If oxidation spots are a problem you might want to examine your drying
> > after
> > resist strip.  This can be a big contributor to spots.  Also, do you run
> > the
> > cores right out of the box or through some sort of a pre-clean?  Certain
> > pre-clean chemistries can really do a number on double treat.
> >
> > I agree with Brian that Lloyd Doyle make an outstanding machine.  I've
> > personally found it to be superior to its competitors in many ways, but
> I
> > wouldn't recommend it for solving your low reflectivity problems.
> >
> > I also agree with you 100% that you should try to find the most
> economical
> > solutions possible and try to maximize the potential of what you have
> now.
> > And I'd be willing to bet that you can still get a good deal more out of
> > your reflective scanners.  On the flip-side, however, a fluorescence
> > machine
> > will solve all your problems.  You'll wonder how you ever got along
> > without
> > one.
> >
> > Hope this helps,
> > Evan...........
> >
> > > -----Original Message-----
> > > From: Ed Cosper [SMTP:[log in to unmask]]
> > > Sent: Saturday, November 20, 1999 10:03 AM
> > > To:   [log in to unmask]
> > > Subject:      Re: [TN] AOI equipment
> > >
> > > Hi Frank,
> > >
> > > Interestingly I do not recall discussing filters. I do know there are
> > > diffusion filters on the units we have. I presumed that all options
> have
> > > been explored since we have had the Equipment Manufacturer out to
> > evaluate
> > > this concern several times. The conclusion has been reached the
> > equipment
> > > is not designed to handle double treat copper laminates and has
> > > limitations
> > > with regard to line tops less than 3 mils.
> > >
> > > They are recommending we trade in our existing system and purchase one
> > of
> > > their laser units.  Being that I have been in the business long enough
> > to
> > > understand that an equipment salesman's job it to sell equipment, I
> > always
> > > like to explore my options before I decide to spend money.  This
> > supplier
> > > has always treated us fairly and I really have no reason dispute the
> > > recommendations. However, I never lose sight of the fact that part of
> > what
> > > I'm paid to do is to make decisions which insure profitability.
> > > Therefore,
> > > I must always explore options that may potentially be more economical
> > and
> > > still produce the desired results.
> > >
> > > Ed Cosper
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: Frank Freitas <[log in to unmask]>
> > > To: <[log in to unmask]>
> > > Sent: Saturday, November 20, 1999 11:57 AM
> > > Subject: Re: [TN] AOI equipment
> > >
> > >
> > > > Hi Ed,
> > > > Have you considered the use of filters to eliminate the
> identification
> > > of
> > > > false defects?
> > > >
> > > > Frank Freitas
> > > > McGean-Rohco, Inc.
> > > > 70 Industry Drive
> > > > West Haven, CT 06516-1448
> > > > 203-937-9004
> > > >
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