SOVIET COLOR TELEVISION

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000600350461-1
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: August 22, 2011
• Sequence Number: 461
• Publication Date: October 18, 1950
• Content Type: REPORT

Sanitized Copy Approved for Release 2011/09/14: CIA-RDP80-00809A000600350461-1
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CENTRAL INTELLIGENCE AGENCY REPORT
INFORMATION FROM
FOREIGN DOCUMENTS OR RADIO BROADCASTS CD NO.
CLASSIFICATION CONFIDENTIAL CONFIDENTII
Scientific - Radio, television
Monthly periodical
Moscow
May 1950
THIS DOCU YLNT CONTAINS INFORMATION AFFECTING THE NATIONAL DEFENSE
OF TIIE UNITED STATES WITHIN THE MEANING OP ESPIONAGE ACT EO
U. S. C.. SI AND 32. AS AMENDED. ITS TRANSMISSION OR THE REV [CATION
OF ITS CONTENTS IN ANT MANNER TO AN UNAUTHORIZED PERSON IS PRO-
NISITED OT LAW. REPRODUCTION OF THIS FORM IS PROHIBITED.
Radio No 5, 1950, pp 45-1+7
DATE OF
INFORMATION 1950
DATE DIST. I" Oct 1950
NO. OF PAGES 2
SUPPLEMENT TO
REPORT NO.
THIS IS UNEVALUATED INFORMATION
cONFIDmNPIAL COtGIR T1AL
Sanitized Copy Approved for Release 2011/09/14: CIA-RDP80-00809A000600350461-1
/figure referred to is appended)
Soviet scientists and inventors have contributed many useful ideas and methods
of construction to the interesting field of color television. -As far back as 1925,
one of the pioneers of television, I. A. Ademian-, suggested a system of_color tele-
vision and:. in 1929, the well-known'* inventor in this field, Yu. S. Volkov, took out
a patent on an-electronic system of color television? Thus,. Soviet inventors pro-
posed systems of-color television when high-quality television, in general. was
only a daring fantasy to, foreign specialists.. Author then discusses-well-known
principles of color television and some of the systems-in use, such as-the mechan-
ical system employing a rotating color disk]
In the sequential system it is possible to apply purely electronic means to
the division and synthesis of colors. The ebove-mentioned patent taken out by
Volkov specified exactly such a system. The Volkov system specified a receiver
with optical synthesization of colors. The screen of the cathode-ray tube is
divided into three parts. Iu'one part-the image is-reproduced through a red fil.
ter, in the -second, through a'blue filter and, in the third, through?a'green$fll_,
ter. The corresponding parts of the screen have red, blue, and`green luminescence,
or are.covered.by color filters if they have white luminescence0 All'three 'images
are projected through se crate lenses on a common screen where they are combined
into one color image. LThe author next discusses a system.of color television
using three independent simultaneous w:-operating single-color systems
The development of color-television has added to the,problems connected with
projecting an image on a large screen. The fact is that,-.as a result of signifi-.
cant, losses of light in color filters (the brighthess.is,reduced to about one-tenth
in a disk-system), projection systems with lenses' and mirrors are rather inade-
quate. Scientists are now working on another projection method -.wwhichpromises a
complete solution of.the large screen problem both for black-and-white and for
color television. This-method was first put forward by a Soviet scientist, Acade-
mician Chernyshev. it is based on the so-called light valve systems, which utilize
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CONFIBRITIAL
CONFIDENTIAL
the coloring effect of transparent crystals of certain alkali metals under _
electron. bombardment, The transparency of the crystals at any given point de-
pends on the current intensity of the electron beam, while the color depends on
the screea_material.. The image formed by the electron.beam (like $, positive
slide or frame of a smera),,with the, aid of a strong light beam from an exter-
nal light source, is projected on a large screen. After each frame, the image
can be effaced by an electric field..
The type of light valve tube employed can be seen in the appended figure.
The tube screen is formed by an extremely fine layer of crystals. Both sides
of the screen are coated with transparent metallic films to which is applied
the voltage, for "deco?o'iaing" the screen. The usual system of aeflecting
.and focusing the electron been is used. To ensure projection of the image on
the screen, the axis of the electron projector is fixed at a certain angle to
the optical axis of the tube.
A colored image may be obtained in this system by introducing a rotating
color disk or using a tube with a three-layer screen. Under electron bombard-
ment, each of the layers is colored. by one of the bask colors The depth of the
beam?'s penetration into the first,_second, or third layer can be varied by switch-
ing the accelerating electric field. Because of the M ---y tech_logicay ' dif-'
ficulties involved, color systems of this type Vhave not.as,yet been,put in prac-
tice, rut there is no doubt that "light vlave" systems have excellent prospects of
producing color images on a large screen,
The solutidn of h'number of remaining engineering problems will facilitate
the early introduction of color television in broadcasting practice.
CAppended: figure follow)
'T'ransparent
crystalline plate
Transparent
metallic films
CONFIDENTIAL
Sanitized Copy Approved for Release 2011/09/14: CIA-RDP80-00809A000600350461-1