11 Apr
2009
11 Apr
'09
10:18 a.m.
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