Microfiche scanning

[Pete Turnbull]

On Apr 21 2005, 18:28, John Foust wrote:
> At 05:14 PM 4/21/2005, Pete Turnbull wrote:

> > somthing to hold the fiche against a lens and project a
> > magnified image onto the scanner glass.  I assume that, in essence,
> > is how Al's big fiche scanner works.
>
> What, no one here has ever tried to bolt a scanner to the
> frosted glass face of an ordinary fiche viewer?  You'd want to trick
> it into not using its own lamp, but that's been done before with
> the guy who turned a scanner into a high-res camera.

You could just remove the fiche viewer screen.  You don't need the
screen to form the image, you only need the (virtual) image from the
viewer's lens system to be focussed in the same plane as the scanner's
optics.  Actually, since the image is usually focussed on the back
surface of the viewer screen, you'd want to remove it anyway.
 Similarly, you don't need to remove the scanner's lamp, except perhaps
to eliminate stray reflections that would cause glare and reduce
contrast.  You would just disconnect its power if that were the
requirement.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York