I guess the sensible thing to do would be to get some UV LEDs and some
boards and do some experiments. If it worked it would be better than masking
or milling. Since you can't find any print shops any more that will make a
good film negative or positive it's really hard to make a decent mask.
--
Phil Mattison
http://www.ohmikron.com/ ----- Original Message -----
From: Marko Pavlin (home) <mp@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, December 20, 2006 8:10 AM
Subject: [Homebrew_PCBs] UV photoplotter
> Hello!
>
> I am following this nice group for a while. This is my first post.
>
> I've got old X/Y coordinate table which used to be simple pick and place
> machine. There's no Z axis and mechanics is not strong enough for
> holding any machine with drill or mill tools. One crazy idea crossed my
> mind... what if I put one UV light source to this machine and plot with
> UV light directly to photoresist coated FR4? I can make small optical
> mask with (e.g.) 10 mils aperture, which floats on thin air blowing
> beneath the mask. It could act as single (fixed) aperture photoplotter
> for direct exposure of PCB photoresist.... Is this kind of stupid idea?
> Anyone had experience with that? Would be UV LED enough? Exposure time
> is critical here, but I am talking about PCB prototyping.
>
> Any comments?
>
> Regards!
> Marko
>
>
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