It's an issue for extremely fine tracks.
You can always use 4 inch drain pipe, cut in half along the longitude, and
lined with mirror plastic, plus "egg crate" for fluorescent fittings. Three
or Four UV tubes will then do the trick for you
Regards
Frank
From: arvidj01 <
arvidj@...>
Reply-To: <
Homebrew_PCBs@yahoogroups.com>
Date: Saturday, 6 July 2013 3:05 PM
To: <
Homebrew_PCBs@yahoogroups.com>
Subject: [Homebrew_PCBs] For a DIY exposure box ... is collimated light an
issue?
> Having been given several flat bed scanners I am finally going to build an
> exposure box and was thinking about the light source.
>
> The boards could be as big as 5 x 5 inches down to .75 x .75 inches.
>
> I look at the multi-led solutions and it seems like the non-collimated light
> might be an issue.
>
> The nail dryer bulb solution might be slightly better but maybe not.
>
> A single point source such as a single high powered led by definition would
> not be collimated but at least it would be a single point source. But then one
> has to deal with uneven exposure from viewing angle issues.
>
> Any thoughts based on your experiences would be appreciated, including "Your
> are over thinking this! Just build the d..n box.".
>
> Thanks,
> Arvid
>
>
>
> ------------------------------------
>
> Be sure to visit the group home and check for new Links, Files, and Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>
>
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