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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