thank you for that information.
i did know there is a laser but had no idea how it is deflected.
i thought the fiberoptic cable is for adjusting the intensity of it, but
possibly it is for both - sync and intensity.
i think it would be possible to convert it, but i would try to move the pcb
under (or over, which might be easier but then you can't mount small pcbs)
the laser. assembly.
the biggest problem with it i think is th uv laser, its flimsy power needs
high sensitivity resist (which requires darkroom?). also it will not work with
the lenses in the unit, and not with the fiberoptic sync.
is it true there are pretty standard flatbed plotters on the market which
have a fiberoptic cable to the
pen holder with a lcd shutter in it?
and a more powerful laser on the side?
if you are good in programming, and can get your hand on a powerful laser
you may also manage to use a real lcd screen (small) with some resolution to
directly use the gerber apertures and make flashes on the board, not
substituting every pad with lines.
i believe i have seen that somwhere but am not sure.
regards
stefan
> --- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan
> <stefan_trethan@g...> wrote:
>
> >
> > the hp3d has 300x300 dpi.
> > i don't think this would work.
> > but it would really be nice to simply print to a normal lj.
> >
> > (in a laser printer, how is the laser deflected in the horizontal?)
> >
> > you would also have to adopt all the paper sensors for x/y exposing.
> >
> > regards
> > stefan
> >
>
> Actually, the resolution depends upon a lot of things. It might have
> been limited by the optics, or it might have been limited by the
> control circuitry (e.g. memory for the bitmap, processing speed, etc.).
>
> The laser is deflected horizontally by a servo-motor-driven spinning
> mirror (I think it's a hexagonal mirror in the LJIII). If I recall
> correctly, the speed is set by a clock crystal, and the laser is
> sychronized by sensing when it reaches a certain point of deflection
> (at that point, it's reflected with a small mirror into a fiber-optic
> cable that leads to a photosensor on the control board).
>
> At first, I was thinking that the original LJIII control circuitry
> could be fooled into doing all of my work for me by adapting the
> paper-path mechanism to move the laser scanner down the length of the
> PCB board, rather than its normal activity of moving the paper through
> a printer. I haven't given up on this notion, but it might be easier
> and more robust to simply develop my own control interface for
> managing the scanning mechanism and possibly do the image-to-bitmap
> conversion in the attached computer.
>
> Incidently, I understand that you can buy machines to do stuff like
> this, along with ultra-sensitive photoresist to speed up the exposure
> process. The biggest problem, of course, is throughput: it's simply
> faster for mass production right now to do everything with a mask.
>
> Jonathan
>
>
>
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