A way to do this would be to enclose the led in a fixtire with the beam
focused through a pinhole at the point where the beam would emerge from
the fixture. Maybe a .25mm hole that would be above the surface of the
board by a few microns. paint the inside of the LED fixture black to
minimize reflections...

Vern Jones, Sound Research http://www.foothill.net/~soundres

mark@MBCC.CO.UK wrote:
>
> I think that using a UV LED as a plotter pen is a fantastic idea in theory and certainly a project that I would attempt myself if I could overcome a few problems I can foresee:
>
> > ... The beamwidth is
> > 10 degrees for the narrow ones, which (if I've calculated correctly) would
> > give 0.4mm line width at 2.3mm ( (0.4/2) / tan(10/2) ) off the board
> > surface.
>
> Your 'beam' would presumably need to be as narrow as the narrowest track you wish to
> Regards,
> Mark Brown
>
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