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
> >
> > -----------------------------------------------
> > FREE! The World's Best Email Address @email.com
> > Reserve your name now at http://www.email.com
> >
> > ##############################################################
> > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
> > ##############################################################
> > To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in
> > the body:
> > To subscribe: SUBSCRIBE TECHNET <your full name>
> > To unsubscribe: SIGNOFF TECHNET
> > ##############################################################
> > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
> additional
> > information.
> > If you need assistance - contact Gayatri Sardeshpande at [log in to unmask]
> or
> > 847-509-9700 ext.5365
> > ##############################################################
> >
>
> ##############################################################
> TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
> ##############################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in
> the body:
> To subscribe: SUBSCRIBE TECHNET <your full name>
> To unsubscribe: SIGNOFF TECHNET
> ##############################################################
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
> additional
> information.
> If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
> 847-509-9700 ext.5365
> ##############################################################
##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe: SUBSCRIBE TECHNET <your full name>
To unsubscribe: SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################
|
