I Think its definitely doable but complex, the main obstacle will be finding the optics and necessary calculatons to proyect the 96dpi image onto the board with this image scaled down to get 600 or more dpi, from there the board could be moved in x and y in a raster way.
I think it would be a little bit easier to adapt a cnc to work as a laser raster scanner, see bungard, they are doing exactly this idea.
--- In Homebrew_PCBs@yahoogroups.com, "AlienRelics" <alienrelics@...> wrote:
>
> A very high resolution projector or monitor would be 1280x1024, do you agree?
>
> Some here have tested Laser printers and found 600dpi models to be wanting, 1200dpi being de rigueur.
>
> So that is only about 2x1.5 at 600dpi, 1x0.8 at 1200dpi.
>
> A monitor is normally around 72dpi to 96dpi.
>
> A clever thought, however.
>
> Steve Greenfield AE7HD
>
>
> --- In Homebrew_PCBs@yahoogroups.com, Raj Jain <r.k.jain.or@> wrote:
> >
> > I have watched the discussions on printers and their limitations on this
> > forum.
> > I have seen the use of DLP projectors to harden resin in 3D printers.
> > I was wondering if a similar adaption will be effective in exposing
> > photoresist material at very high resolutions.
> > Maybe use high resolution CRT or LCD monitor as a contrasting source of PCB
> > image. A PCB could be prepared and taped on the monitor for exposed.
> > ...raj
> >
>