Ed

I don't have the answer to the quantitative questions you asked but I can
answer some of the qualitative ones.

I'm an advocate of both reflective and laser systems.  I can't imagine
trying to run everything we build through one type of machine or the other.
We have both types at Merix as well as Orbotech's new InSpire, which I
believe is a hybrid of the two with some magic thrown in (or so I'm told).
When you have start comparing different types of systems you'll see each has
it's strengths and weaknesses.  You'll find that different products run
better on one machine than the other.  This includes signal and plane
layers, fine lines as well as different types of copper and dielectric.
You'll usually find that one machine will not only be faster but more
accurate in terms of false defects and missed real defects.  You obviously
are looking for a specific solution for fine lines.  Unfortunately I don't
have an exact recommendation for you.  I can recommend that if you currently
have all one type of machine that you look seriously at diversifying.
> ----------
> From:         Ed Cosper[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Ed Cosper
> Sent:         Monday, June 05, 2000 6:54 AM
> To:   [log in to unmask]
> Subject:      [TN] Reflective AOI systems
> 
> HI all,
>  
>  I'm looking for some feedback as to the effectiveness of reflective AOI
> systems for use on etched lines that finish with below a .004 top.  I have
> had mixed results in this area. When left with a 4 mil top ( or less ) on
> the circuit after etch,  we tend to see a lot of prude defects related to
> stains and other cosmetic blemishes. This leads to excessive amounts of
> verification which we all know increases the potential of escape. 
>  
> We are currently looking a purchasing a new AOI system We are debating
> between Laser or reflective. So, based on this  perhaps those of you that
> use AOI units could respond to the following questions.  Due to the nature
> of the request, you may wish to send the response to me directly. 
>  
> Please note: I am not looking for response from AOI suppliers. Users
> only.  
>  
> 1.  Would you recommend laser or reflective?
>  
> 2.   Do you have laser or reflective?
>  
> 3.  How many false callouts are you having to deal with on fine 
>     lines?
>  
> 4.  Whose equipment would you recommend?
>  
> 5.  How much down time are you seeing?
>  
>  
> All responses will be greatly appreciated.
>  
>  
> Thanks,
>  
> Ed Cosper
>  
>  
> I would appreciate some feedback 
> 

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