> In a message dated 6/11/01 11:20:41 PM Eastern Daylight Time,
> [EMAIL PROTECTED] writes:
<snip>
> > the reference designators to make sure they are readable. It would be
nice
> > if there were a design rule to automatically check this for me: White
> > Silkscreen ink can only be printed on top of green soldermask.
>
> Actually, my understanding is that the PCB house usually just masks the
> silkscreen layer with the soldermask layer, without even asking you, since
> you almost never want ink on top of those nice shiny pads. But I have seen
> white ink on bare copper on occasion where something was misregistered.
>
> Steve Hendrix
I fully concur that you never want to put silkscreen ink on top of *pads*,
but there *might* still be times where you want silkscreen ink placed in an
area of the PCB where there is no soldermask film (as long as there are no
pads in the same area).
I have had visions (for some time) of creating a Process which would check
for any instances of items on a Silkscreen layer occupying the same area as
pads (or vias) on the same side of the PCB, but have not got around to
actually doing this as of yet. But I suspect that such a Process would be of
interest to many users.
I currently check my PCB file visually to look for instances of items on
Silkscreen layers being in locations they shouldn't be, and follow up by
also checking the Gerber files in a similar manner. However I still
appreciate that a Process that could detect and report such instances would
have much to be said for it. And perhaps there is something to be said for
enabling the user to optionally specify that silkscreen ink must also always
be placed on top of soldermask material.
I'm still working on writing software for a PCB Inverting Server, but I
would consider creating such a Process after completing that. (I think that
another task that such a Process should detect and report is incidents of
silkscreen ink occupying the same area as items on the *Paste* Mask layer.
You do not want silkscreen ink in any location where Solder Paste is being
applied either.)
Regards,
Geoff Harland.
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