This gave me an idea.. I wonder if it would be possible to replace the
laser diode in a laser printer with a uv one, and then run a
sensitised board through in place of the drum..
What do you guys think? Am i crazy?
On 2/15/08, pork_u_pine2000 <wittend@...> wrote:
> --- In Homebrew_PCBs@yahoogroups.com, "zip1zip1zip1" <tom@...> wrote:
> >
> >...
> >
> > BestHongKong
> > http://stores.ebay.com/BestHongKong_W0QQtrksidZp1638.m118.l1247
> >
> > List three different LED's
> > x561 390-395nm 100/ USD $8.75 ship $8.95
> > x562 395-400nm 100/ USD $7.75 ship $8.95
> > x563 400-410nm 100/ USD $9.95 ship $8.95
> >
> >
> > Tom
> >
> I bought about 100 of each of these grades from BestHongKong and they
> seem entirely satisfactory. I was looking at the absorption maxima
> for organic materials (fish-glue gelatin and some of the
> polysaccharide gums) and found that the 390-395 range looked best, but
> all seem to work. I ended up buying some UV strips with 3 LEDS
> mounted on an aluminum carrier that are set up for 12v. They seem to
> produce more output than I would guess. I have more problem with
> overexposure than with underexposure.
>
> I mounted the strips on a 1 foot chunk of heavy aluminum heat sink
> (because that is what I had handy), wired about 9 of the 3 LED strips
> in parallel. I hooked the whole works to a gel cell battery (too lazy
> to build an adequate power supply) and an old darkroom timer. I put
> the leds in an old, gutted HP scanjet which makes a great contact printer.
>
> Anyway, BestHongCong has been a good source for LEDS. I just wish
> that they had more chip-type LEDs and some shorter wavelengths (365 -
> 385 would be helpful). And good, cheap, stable single mode UV Laser
> diodes. I want to try direct-draw on photosensitive material with an
> inkjet mechanism with the jet heads replaced with a laser diode.
>
> -- Dave
>
>