Hello,
there are modern fotoplotters with fine pixel resolution, they may plot
traces with a width of 1.0 mil. But this does not guarantee that these
traces may be etched on a copper layer or printed with silk screen.
Look for the smallest structures your pcb manufacturer is able to
produce on copper or silk screen.
Bye
Hi, Uwe:-
That's an overly pessimistic interpretation. The resolution that the
supplier can typically reproduce is probably several times higher than
the guaranteed no-breaks, no-shorts line-space minimum specification.
IOW imagine a 1mm square- you might be able to reproduce a 50 or 100um
square "pixel" stuck in the middle of one side, but that doesn't mean
that the supplier guarantees that a 50mm long trace 100um wide or
traces spaced 100um apart will be electrically perfect.
Unless you want your beautiful corporate logo to come out all
pixely-like (I suppose it might be blocky to begin with), it's best to
err on the side of higher resolution. Maybe 200-300 DPI in the final
size, which is around about 80-120um.
In the old days of computing, a high-res logo could actually slow down
the layout software noticably, so one would tend to add it last, or
turn it off during significant edits. Now that everyone has fast
workstations, it doesn't seem to be noticable.
--sp