Here is another interesting article on photoresists exposure.
http://www.circuitree.com/CDA/ArticleInformation/features/BNP__Features__Item/0,2133,3647,00.htmlDoing some searching, the photoresists typically have a sensitivity of
around 60 to 100mJ/cm^2 at 350nm. So if you know the light intensity of
your UV LED you can estimate time for exposure. I have a feeling UV
LED's are far too weak to exposure resists.
Adam
Thomas wrote:
> does anyone have any info about the photo Resist UV Spectrum range for "Kinsten Presensitized" PCB's ?
> I would like to look at this Laser/ UV LED in more detail , speed is not impotant right now but to get it working first will be nice ...
> Thomas
>
>
> ----- Original Message -----
> From: sciciora
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Tuesday, October 05, 2004 8:31 PM
> Subject: [Homebrew_PCBs] Re: OHP Film & Laser Printers, UV Laser Diode
>
>
>
> I did some thinking about this as well. I found on this list that
> some pre-sensitised PCB are sensitive in the range of 340 to 400 nm,
> and peak at about 360nm. The LED that I bought has an output at
> 405nm. As far as power, just move slower! A co-worker's friend, who
> works with optics as a consultant, said it wouldn't be hard to pick
> some lenses and fiber from Edmund scientific to foccus most of the
> LED's light into the fiber. And if I were more serious I might be
> able to get him to help me design something, but due to too many
> projects, trying this will most likely just be a through experimnet
> for me...
>
> - Steven Ciciora
>
> --- In Homebrew_PCBs@yahoogroups.com, "Leon Heller" <leon_heller@h...>
> wrote:
> >
> > >From: "Mike" <yahoo@d...>
> > >Reply-To: Homebrew_PCBs@yahoogroups.com
> > >To: Homebrew_PCBs@yahoogroups.com
> > >Subject: [Homebrew_PCBs] Re: OHP Film & Laser Printers, UV Laser Diode
> > >Date: Sun, 03 Oct 2004 00:41:20 -0000
> > >
> > >
> > >
> > >--- In Homebrew_PCBs@yahoogroups.com, "Thomas" <teecee@c...> wrote:
> > >
> > > > This UV Laser thing has me thinking (dangerous I know) so slap me
> > >for bringing this up !! but during a few search's I come across some
> > >info that uses a UV Laser Diode in a DVD-R Burner & goes on about
> > >Photoresist being part of the Layer that records the Data, if its
> > >similar stuff or not i dont know. Maybe the UV Laser is to small and
> > >possible the focal point could be changed to get a wider beam for
> > >Exposure, sounds easy enough but I bet it aint !!
> > >
> > >Possibly more useful than Lasers, Non-laser UV LEDs are available on
> > >Ebay etc for around 10-20c each. They seem to work fine directly off
> > >2x1.5v AA cells. The beam is divergent at an angle of approx 20
> > >degrees on the ones I have. I would imagine that it would be
> > >focussable with relatively inexpensive lenses too, or get a bunch of
> > >fibre optics and adapt an old dot matrix printer :o)
> >
> >
> > The wavelength needs checking, to make sure it is correct. The power
> also
> > needs to be checked, I don't think that UV LEDs will have enough power.
> >
> > Leon
>
>
>
>
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