--- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan
<stefan_trethan@g...> wrote:
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
<stefan_trethan@g...> wrote:
>Actually, the resolution depends upon a lot of things. It might have
> 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
>
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