I have had luck buying opaque projectors from
government and university surplus. I don't know why I
buy them. The Beseler we were going to sell on Ebay,
but gave to a teacher who had none at his school.
My recent purchase was a $10 Postoscope which must be
about 70 years old.
The simplest design is to build a metal box larger
than your copy. Paint the inside a reflective white.
Leave the bottom center open so you can set the box on
top of your item.
Put in a floodlight on each side to illuminate the
copy. The Postoscope uses 2 250 watt flood lamps, one
per side.
Mount a mirror at a 45 degree angle. (A front surface
mirror would be the best but more costly). This is
what throws the image forward through the lens.
Mount a lens in a tube for focusing on the front of
the box.
Here is one of those stupid ascii drawings that tell
you nothing:
--------------------------
! * floods !
! * !
! * !
! * !
! * !
! * ------
! * - lens
! * -
! * mirror ------
! * !
! * !
! * !
! * !
!* copy bed !
--------------------------
As you have guessed, the problem is to size the copy
bed, mirror and lens to fit your needs.
The lens on the Postoscope is nearly 3 and 1/2 inches
across. It looks like you could prototype something
with a cardboard box, a cardboard tube, an 8x10
mirror, a large magnifying glass lens and the
floodlamps.
Please be careful. With 500 watts inside a cardboard
box, you don't have much time before the fire starts.
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