On 12/11/2007, Stefan Trethan <
stefan_trethan@...> wrote:
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> On Nov 12, 2007 5:21 AM, Andrew Tweddle <sarason@...> wrote:
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> > The basic theoretical reason that laser drum straight to copper circuit
> > board won't work is that it(the copper surface) provides a short circuit
> > onto the drum surface which is an insulator that has a few thousand
> > volts applied to it to hold the toner. Stefan's idea that a pickup
> > roller can then be provided is a good one. Next you would then need to
> > provide a HT (high tension connection to pick the toner off the pickup
> > roller and then onto the copper board and then fuse it on with heat.
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> Maybe even the corona wire wil be enough to push some charge on the
> surface of the drum. Works with paper after all.
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> Lez, i know you say it looks OK, but i'll still believe not all toner
> is transferred and it would not hold up to etching.
> You are welcome to show that i'm mistaken.
well if the copper i have went through i'd love to, but from what i'm
seeing on foil, looks at least 75%, not being an expert on this
'judging transfer by eye' i'm not going to say its 100%, but it looks
just like what i see on paper, also not i amnot printing a pcb on
these tests, just doing a printer self test, so i get the demo picture
and text, so it gets some big black areas and some fine lines
maybe it sticks better to aluminium than copper, foil stuck to card
would be a cheap way to make bendable pcb's, if i could solder to it
lol