On Thu, 12 Oct 2000 13:33:37 -0500, you wrote:

>On Thu, 12 Oct 2000, David VanHorn wrote:
>
>> One approach that always intrigued me, was to plot directly onto the =
PCB
>> material using a UV light through a fiber.  I've never tried it, but =
it
>> seems reasonable that it would work.
>>
>> Exposure time would be controlled by pen speed, but I'm not sure how =
much
>> power you'd need down the pipe to make it work..
>>
>> Same basic technique though, put the fiber down an old pen (ink type, =
with
>> metal nib) and have at it.
>
>Interesting thought...  roll-your-own Gerber photoplotter, eh?  Given =
the
>diameter of the average fiber, a larger pad could take a while to plot,
>though.  Wonder if it's practical?
It has been done, although the version I saw was for plotting on film.
Used a very powerful UV lamp and special quartz fibre.
Problem is most photo PCB is positive, so light plotting wouldn't be
easy. However you can now get UV LEDs.....

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