Homebrew PCBs

----- Original Message ----- 
From: "dkesterline" <desterline@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Friday, April 16, 2004 9:40 PM
Subject: [Homebrew_PCBs] Re: CNC photoplotting (was Small UV source)


> This idea of CNC photoploting has got my wheels turning.
>
> Does anyone know what wavelength the laser emitters in laser printers
> are?
>
> I'm thinking that it might be passible to photoplot directly onto
> sensitised boards.
>
> There's several rather large issues to address. (wavelength, exposure
> time, feeding the board- just to name a few)

It won't work - you need UV, not IR. You also need a *lot* of UV power at
the correct wavelength to do it 'on the fly'. It isn't really feasible with
the available technology, AFAIK. Think of how much power you need for, say,
a 5 minute exposure using ordinary UV exposure techniques.

Leon