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make solder paste stencils, now, but originally made it for PC board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.
--Chuck
