If you use f-theta lens in front of rotating mirror this solves the problem .
--- On Tue, 11/24/09, javaguy11111 <javaguy11111@...> wrote:
From: javaguy11111 <javaguy11111@...>
Subject: [Homebrew_PCBs] Re: Blue Laser LDI Dry Film Results
To: Homebrew_PCBs@yahoogroups.com
Date: Tuesday, November 24, 2009, 3:47 PM
I would think using a mirror like that would cause the sides of the exposed area to not be vertical.
--- In Homebrew_PCBs@ yahoogroups. com, "lmri2071" <lmri2071@.. .> wrote:
>
> This is wonderful !
>
> I spent seven years to see something like that.
>
> I think, that the next step would be use a polygonal mirror. Maybe, trying to modify a laser printer.
>
> Lucho
>
> --- In Homebrew_PCBs@ yahoogroups. com, "Volkan" <v_sahin@> wrote:
> >
> > I did some tests on dry film that is exposed with blue laser. You can find the result files under http://tech. groups.yahoo. com/group/ Homebrew_ PCBs/files/ BlueLaser_ LDI_Volkan/ folder.
> > The minimum feature size that I achieved is 2.8/2.8 mil width and space. There is no problem to print 1.4/1.4 mil width and space but development of the dry film is a little bit problematic and it is not possible to do it with simple tray technique. The film that I'm using has a thickness of 1.5 mil, according to some google results the limit is 1.5∗film thickness, so if it is true it seems my results are almost at the limit.
> >
> > Volkan
> >
>
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