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From [log in to unmask] Thu Nov 14 16: |
54:24 1996 |
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This oxidized copper approach could add cost to the board since we
fabbers now have to cover the fiducial <somehow> at HASL. We do have
the means, but go explain that to the guy(s) placing dots all over the
panels....
______________________________ Reply Separator _________________________________
Subject: Re: ASSY: Polishing Fiducials
Author: [log in to unmask] at INTERNET_GATEWAY
Date: 11/12/96 2:13 PM
Allen Hertz wrote:
>
> Pat,
>
> That concept works well. The term "Pink Pearl" was coined as the
> processes since one would purchase a number of those little pink
> erasers and go scrub fiducials. This was effective for HASL or other
> tin-lead finished boards.Gold or OSP finsihes generally do not require
> this operation.
>
> An alternative used was to place lighting under the board and change
> the PCB layout by removing all metallization and resist around and
> under the fiducial. The "backlighting" provides a silhouette,
> eliminating any variations due to reflection. This is a major task,
> especially for various board sizes.
>
> Regards,
> Allen Hertz
> [log in to unmask]
>
> ______________________________ Reply Separator
_________________________________
> Subject: ASSY: Polishing Fiducials
> Author: [log in to unmask] at ftl03
> Date: 11/12/96 12:48 PM
>
> >From the What Will They Think Of Next (WWTTON) dept:
Another request we`ve had in this light (sic) is to leave
the fiducials as bare copper, allowed to oxidize. Brings
an OSP-look to a HASL PWB.
Regards,
--
Jeff Seeger Applied CAD Knowledge Inc
Chief Technical Officer Tyngsboro, MA 01879
[log in to unmask] 508 649 9800
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