Ahouxn.138
net.games
utzoo!decvax!harpo!npois!houxi!houxn!piovano
Fri Apr 30 09:15:34 1982
Third method of color generation
In addition to the shadow mask tube and the beam penetration
methods of generating color, there is a third method that no one seems
to have mentioned. This is the Goodman radiation index tube. It has a
single gun for all three colors and no shadow mask. The phosphors are
laid out on the inside surface of the picture tube in vertical strips
in triplets of red, blue and green with a very thin strip of wire or
metal between each color strip. As the electron beam scans the surface
it causes a small pulse of x-rays to be emitted when it crosses color
boundaries by impinging on the wire or metal strip. This pulse is picked
up by a sensor at the back of the tube and outputs a pulse to indicate a
change of color. The electronic circuitry is then responsible for changing
the signal fed to the electron beam.
Although the tube was usually used in raster scan systems, it can
also be used in vector stroke systems by having the circuitry keep track
of the horizontal direction and switching to the appropriate color.
I do not know if any one still uses the index tube for anything
at all nowadays, but since every one on the net seems to have forgotten
it, I thought I'd resurrect it.
Larry J. Piovano
Bell Telephone Laboratories
Freehold, N.J.
-----------------------------------------------------------------
gopher://quux.org/ conversion by John Goerzen <
[email protected]>
of
http://communication.ucsd.edu/A-News/
This Usenet Oldnews Archive
article may be copied and distributed freely, provided:
1. There is no money collected for the text(s) of the articles.
2. The following notice remains appended to each copy:
The Usenet Oldnews Archive: Compilation Copyright (C) 1981, 1996
Bruce Jones, Henry Spencer, David Wiseman.
