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July 1997

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Subject:
Re: Chemicals for AOI ?
From:
"Scott B. Westheimer" <[log in to unmask]>
Date:
Fri, 11 Jul 1997 21:04:27 +0800
Content-Type:
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The reason that this system work is because there is a fluorescent material
in the laminate and prepreg. It is yellow in color and allows the material
to fluoresce. Materials without this die can not be used on the fluorescent
AOI machines.

----------
From: Jan Thuesen <[log in to unmask]>
To: [log in to unmask]
Cc: [log in to unmask]
Subject: Re: Chemicals for AOI ?
Date: Friday, July 11, 1997 7:26 PM

I have seen some types AOI-equipment for inspection of PCB´s. 
None of the type used any kind of chemicals to prepare the prepreg.
Instead the systems used a combination of reflective and diffuse light (key
point in AOI),
which can illuminate the PCB in a way so that the prepreg looks like it
were fluorescent. 
I have never seen a system, which were based on fluorescence of the
prepreg?

We are using the AOI-systems from Orbotech and very satisfied with the
performance.
Compared to other systems it has a high ratio of reproducibility.

Best regards

Jan Thuesen



-----Oprindelig meddelelse-----
Fra:	Kuwako, Fujio(MMS) [SMTP:[log in to unmask]]
Sendt:	 11. juli 1997 08.36
Til:	[log in to unmask]
Emne:	Fw: Chemicals for AOI

Is anybody in this industry tell me what type of chemicals are being used
for giving fluorescence to the prepreg material for AOI equipment?

Kuwako     
[log in to unmask]

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