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Патент USA US2108617

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Few-5., 15, was°
2168517
F. SCHRC'JTER
ELECTRON TUBE
Filed July 14, 1934
INVENTOR
FRITZ SCH/ZOTER
BY
7%. ZWW
ATTORNEY
Patented Feb. 15, 1938
2,108,617
UNITED STATES PATENT OFFICE
2,108,617
ELECTRON TUBE
Fritz Schriiter, Berlin, Germany, assignor to
Tclefunken Gesellschaft fiir Drahtlose Tele
graphic in. b. 11., Berlin, Germany, a corpora
tion of Germany
Application July 14, 1934, Serial No. 735,203
In Germany July 28, 1933
5 Claims. (Cl. 250-275)
In gas contained Braun tubes serving as tele
vision scanning means or as television picture the focusing cathode 5. Positioned adjacent to
receiver, the so-called ion cross caused by the the cathode is a heat dissociable halogen com
neutral zone of the electrostatical deviation ?elds pound ‘! so that upon the heating of the ther
5 (zero point anomaly) causes disturbance. For mionic cathode, the compound dissociates to
produce electron negative ions.
5
on the one hand, the ion space charge effect pro
Besides
the
electro-negative
gases
or
vapors
duces a ?eld distortion between thev deviation
plates which reduces the deviation velocity of the which are required in an extremely low concen
electron ray in the zero zone, thus also causing tration only, the inert ?lling gases such as argon,
neon or helium ordinarily used in Braun tubes
10 a distortion of the picture. In addition, the
slower movement of the electron ray produces on are suitably present, they are even necessary un~ 10
der certain circumstances, since without their
the receiving screen an increased brilliancy dis
cernible as a brighter cross standing out from the presence the desired concentration action hold
background.
15
2O
‘
The invention has for its purpose to avoid this
disturbing phenomenon. It consists in the com
pensation of the space charge produced in the
zero zone by the positive ions, by a corresponding
ly apportioned space charge of negative gas or
vapor ions. In accordance therewith electro
negative gases or vapors, for instance iodine vapor
or vapor of metallic or non-metallic halogen
compounds are provided in the Braun tube. The
heavy negative ions which may then be produced
in a small amount by adhesion of electrons onto
-5 the gas or vapor particles, and which due to
their inertia of the mass have approximately the
same electrical movability as the positive ions
remain mixed with the latter and compensate
the otherwise forming disturbing space charge
3
eiiect. In carrying out the invention it is of
advantage to employ in the tube such compounds
of electro-negative elements which at a de?nite
temperature, for instance in the vicinity of the
heated cathode, begin to dissociate, such as zircon
chloride, thallithallo-chlo-ride and the like. In
selecting the respective substance not only must
its capability of producing suitable vapors at the
desired pressure be considered, but also its chem
40 ical behaviour with respect to metallic electrodes
of the tube and in particular with respect to the
cathode whose function during the entire dura
3
tion of action should be in?uenced as little as
possible.
45
In the drawing I have shown schematically one
embodiment of my invention.
.
Referring to the drawing, the envelope 1 has
mounted within it the thermionic‘ cathode 3 and
ing the electron ray together, would be absent.
Having thus described the invention, what I
claim is:
15
1. In a cathode ray tube wherein is provided
a cathode, the method of supplying an electro
negative vapor comprising the steps of position
ing a heat-dissociable halogen compound adja
cent to the cathode and supplying heat to said
cathode to produce dissociation of said compound. 20
2. In a cathode ray tube wherein is provided
a cathode, the method of supplying an electro
negative vapor comprising the steps of position
ing zircon chloride adjacent to the cathode and
supplying heat to said cathode to produce dis- 25
sociation of said compound.
3. In a cathode ray tube wherein is provided
a cathode; the method of supply electro-negative
vapor comprising the steps of positioning thalli
thallo chloride adjacent to the cathode, and sup- 3°
plying heat to said cathode to produce dissocia
tion of the compound.
4. An electron device comprising a glass en
velope, a thermionic cathode within said envelope
for emitting electrons, electron focusing means 35
cooperating with said cathode, and a heat dis
sociable halogen compound adjacent to said
cathode.
5. An electron device comprising a glass en
velope, a thermionic cathode within said envelope ‘10
for emitting electrons, electron focusing means
cooperating with said cathode, a heat dissociable
halogen compound adjacent to said cathode, and
a gas chosen from Group VIII of the Periodic
Series under low pressure ?lling said envelope.
FRITZ scHRc'iTER.
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