kareno wrote:I have been giving thought to implementation of a disk version of a mirror drum. This has actually been done using inclined mirrors near to the periphery of the disk (I may be wrong, but I think Hollis Baird - no relation - achieved this).
But if a mirror is strictly on a disk then it translates sideways before the light source as opposed to rotating before it. To turn translation into deflection I thought of the arrangement in the attachment. A collimated light source, such as from a laser, comes in from the right. A domed mirror on the disk sweeps in front of the beam. The changing angle of the mirror surface where the laser beam strikes causes vertical deflection.
I think a spiral of such domed mirrors would achieve horizontal deflection for frame scan too. Now I just need to find a source of small domed mirrors!
Hi Karen you can see some effects off the mirror on the flat here on my you tube site
http://www.youtube.com/user/039dalekmoo ... NWa0OY5cns
some where there in my list ...
i found for me the mirrors worked better on the drum but i didn't play around enough on the disc to get it working right but had some interesting effect of amplifing the image via reflections on the outer part of the disc...
Even took me ages to work out i was viewing the image at the wrong angle .
You might find the nipkow mirror one of interest just for what you might expect.Sorry the videos a bit crappy its all i had didn't convert well.
I tried my drum as tiny squares as i recalled but i was only using one luxeon and i don't think that was enough so worked with the full mirrors just angles of the mirrors as they rotated doing the angle changes ...the video of the nbtv test card in upright video is on my you tube site too so and a few others which might be of help too.
My daughter was given a birthday present a while or so back a box of toy plastic beads all different colours shapes so that might be some where to look for this sort of thing ,some time back i got 100 tiny round mirrors from a craft shop they might have something like that you want too ..
Good luck i will watch with interest.
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.