cclist at sydex.com
Sun Aug 30 17:09:56 CDT 2015
On 08/30/2015 02:00 PM, Jon Elson wrote:
> I hacked a fiber optic light pen onto a Calcomp plotter and made some
> artwork directly onto film, and then in 1996 I built a laser
> photoplotter that cranks out 1000x1000 DPI images on red-sensitive
> film at 0.6 inches/minute. It can do up to 20 x 24" films, but I've
> never gone over about one foot square. The trick is, it has to be
> VERY accurate to line up with existing PC boards. I mostly use it to
> make solder paste stencils, now, but originally made it for PC board
> master artwork.
That's pretty impressive, Jon.
I do remember the headaches with registration of early multi-layer PCBs.
Lots of rejects.
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