Re: gEDA-user: Olimex and PCB?

[Karel Kulhavy <clock@xxxxxxxxxxxxx>]

On Mon, Mar 20, 2006 at 12:49:08PM -0300, Xtian Xultz wrote:
> Em Dom 19 Mar 2006 14:59, DJ Delorie escreveu:
> > Note that PCB used to produce an inverted solder mask gerber.  We
> > fixed that a few years ago, though.  A "properly" formed mask would
> > have "dark" over the pins and pads, where the mask *isn't*.
> 
> Unfotunatelly, thats not 100% true. 
> In my fab, when I made a double sided board, I must generate a mask where the 
> pads must be dark and the rest must be white. Thats because the process is 
> like a revelation, where the pads do not receive UV light and dont gets the 
> mask.
> When I made a single sided board (without hot-air solder plating) I must 
> generate a mask with the pads white and rest blask, because the process is 
> made with silkscreen. 

I take the PCB output and define the polarity meaning in the
accompanying README file for the factory. I guess their software can do
inversion if they need it.

CL<