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	Fri, 25 Sep 2015 07:57:41 -0700 (PDT)
Date:	Fri, 25 Sep 2015 16:57:34 +0200
From:	"Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] Off topic (UV printer)
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> > I'm referring to using the multi-mirror DLP ic by Texas Instruments that used to be used in TVs. The company in the following link
> > uses the TI DLP chip to print directly, by projection. No chopping up of an office laser printer is required. You'll need good
> > knowledge of optics to get this working, but I consider this the best way to go.
> > https://www.youtube.com/watch?v=heUPV0aci5c
> 
> 
> That video by Maskless Lithography showed multiple bright light square reflections on
> the surface being projected to.  So they load up as much image as will fit into on micro mirror chip
> and then an adjacent one handles more.  Just one micro mirror chip would do some good prototypes.
> 
> I wonder if any of the patents about grey level imaging are expired?  28 related to micromirrors AND grey level imaging
> before 1995...  28 expired patents to work with for an open hardware product...

A laser printer usually have 600dpi resolution and 5 megapixel is equal to a square of about 3.7 inch with 600dpi resolution. Laser printers are a good choice for the film but if laser is applied on the film it should not be that much harder to apply directly on the board.

With cheap equipment ready to be used I make a simple circuit board without holes in half an hour. I have a UV box but the light is not parallell and uniform along the tubes.

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