[QuadList] Image Orthicon physics (was Early Quad Color--"Saving Cyd Charisse"...)

[george keller]

Great seeing that old stuff with all the specs on it, they were sure advanced back in '49 and 50's.

What do you call a tube with that many grids??  A sex-toad???

DE: G. Keller






-----Original Message-----
From: Ted Langdell <ted at quadvideotapegroup.com>
To: Quad List <quadlist at quadvideotapegroup.com>
Sent: Thu, Aug 12, 2010 10:34 am
Subject: Re: [QuadList] Image Orthicon physics (was Early Quad Color--"Saving Cyd Charisse"...)


Here's a poop sheet on an RCA 5820, describing its principles of operation: 
http://www.cs.cmu.edu/~sensing-sensors/S2009/pix_etc/Image_Orthicon-5820.pdf 
 
The Halo effect is explained here: 
http://en.wikipedia.org/wiki/Video_camera_tube#Dark_halo 
 
The lack of the built-in edge enhancement is what prompted CBS Labs to develop the image enhancer/edge enhancer/contour detail system which it used with the network's Norelco PC-60/70 cameras. 
 
Ted 
 
On Aug 12, 2010, at 5:34 AM, Dennis Degan wrote: 
 
> 
> On Aug 11, 2010, at 10:12 PM, Dale Lamm wrote: 
> 
> > Somewhere I read that the Orthicon's halo was due to a surplus of > electrons coming off the target due to a bright part of the scene > and being drawn to 
> surrounding areas. 
> 
> I agree: 
> 
> Yes, the electrons would 'bounce' off the target and land > elsewhere, causing the halo's glow around those bright areas. 
> 
> Dennis Degan, Video Editor-Consultant-Knowledge Bank 
> NBC Today Show, New York 
> 
 
Ted Langdell 
Secretary 
 
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