Check out ELECTRONIC PACKAGING SERVICES LTD CO.
430 Tenth Street Suite S-003A
Atlanta GA 30318
tel (404) 881-1114

They use a grating and laser light to show interference patterns to show
out-of-flat areas.

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> From: Debbie Kenney <[log in to unmask]>
> To: [log in to unmask]
> Subject: [TN] Coplanarity for chip assembly
> Date: Tuesday, May 26, 1998 1:27 PM
>
> >  As a manufacturer of flex circuits, pad coplanarity has become a
> > major issue for us when our customers assemble the chip onto the flex.
> > We are in dire need of information on sources and equipment available
> > that can measure coplanarity of copper pads. Is laser or optical
> > better?
> >
> > Any help and / or ideas are greatly appreciated.
> >
> > Debbie Kenney
> > Disk Drive Division
> > M-Flex
> > [log in to unmask]
>
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