laser scope

[Alexis]

On Sunday 12 April 2009 02:33:33 Scanning wrote:
> I beg to differ. There is nothing that would preclude mounting say six long
> skinny front surface mirrors into a hex configuration ( as viewed from the
> side ) onto a motor shaft and spinning it pretty damn fast ( below such
> point that it would fly apart ). I've seen a variation of this theme used
> in some of the UPC scanners, but those have no need to spin fast.
>
> Best regards, Steven

In fact, this is exactly what some early mechanically scanned televisions used 
to use. It's called a mirror drum.

Have a look at
http://www.televisionexperimenters.com/mirrdrum.html

The major issue with this is the drums have to be aligned properly, and they 
can't be adjusted while the drum is spinning. The Mihaly-Traub Scanner gets 
around this shortcoming by effectively turning the mirror drum inside out:

http://www.televisionexperimenters.com/mhalytrb.html

On Tuesday 24 March 2009 05:56:23 Tony Duell wrote:
> An eccentric friend of mine once used his Tekky 556 as a video monitor.
> It has 2 timebases, which he used for the X and Y sweeps, and fed the
> video signal, suitably buffered, into the Zmod input. 80 column text was
> very clear, although you pretty much needed a lens to read it ;-)

I've done that :)

http://www.youtube.com/watch?v=6fNnSO5G6hM

 -- Alexis