Dale Botkin wrote:
>
> On Tue, 12 Nov 2002, Richards, Justin P wrote:
>
> > 1. How do they originally get the copper to stick to the board.
> >
> > 2. In a laser printer do they statically charge the drum so it picks up the
> > toner.  If so perhaps the copper could be charged. Using a laser out of one
> > of the $25 to discharge the copper areas to be removed.  Then dusted, heated
> > then etched... starting to sound a little involved perhaps
>
> Especially considering the apparent difficulty of convincing certain areas
> of a large sheet of conductive copper sheet to assume a significantly
> different electrostatic charge potential than adjoining areas...  I'd
> really like to see you figure that one out!

The charge is stored and imaged on the DRUM inside the toner cartridge.
It is then transfered to the paper, which is why you need a bit of flex
there.
They don't store charge on the paper because it's just too hard to control the
conductivity between reams (humidity varies all over the place).

Even the original Xerox 810 (the one where you manually moved the charged
plate from the charger to the contact exposure unit to the toner tray to
the fuser) used an intermediate charge transfer method.

R

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