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Патент USA US2116672

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‘May 10, 1938.
|-|_ EwEsT ET
2,116,672
GASEOUS ELECTRIC DISCHARGE DEVICE
Filed Aug. 21, 1936
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INVENTORS
Hans Ewes’c .
Georg‘ Gaidi 5
ORNEY
Patented May 10, 1938
2,116,672
UNITED STATES PATENT OFFICE
2,116,672
GASEOUS ELECTRIC DISCHARGE DEVICE
Hans Ewest, Berlin-[dchterfelde-Ost, and Georg
Gaidies, Berlin-Pankow, Germany, assignors to
General Electric Company, a corporation of
New York
Application August 21, 1936, Serial No. 97,292
In Germany August 31, 1935
4 Claims.
The present invention relates to gaseous electric
discharge devices generally and more particularly
the invention relates to such devices of the cath
ode glow type useful in television apparatus, or
5 , the like.
The object of the present invention is to provide
a cathode glow lamp which .is responsive to ex
tremely high frequency currents. Another object
of the invention is to provide a cathode glow lamp
10 which is a bright, sharply de?ned, linear light
source. Still further objects and advantages at
taching to the device and to its use and operation
will be apparent to those skilled in the art from
the following particular description.
15
‘
In accordance with these objects the cathode
glow lamp comprises a tubular container having
an elongated sheet metal cathode mounted there
in, which cathode is folded along its length so that
the sides thereof are at an acute angle with re
20 spect to each other. An anode consisting of a ?at
plate approximately equal in length to said cath
ode, having edges overlapping said cathode and a
slot or slit in line with the vertex of said cathode
is mounted in said container in front of the open
2 side of said cathode. The lamp container has a
gaseous atmosphere therein comprising a mixture
of neon and helium in which the helium consti
tutes more than 50% of the neonehelium mixture.
Preferably the gaseous atmosphere comprises a
30 mixture of 70% helium and 30% neon and a small
amount of argon. When desired. the gaseous at
mosphere comprises a trace of hydrogen, or water
vapor in addition to the argon and the neon
helium mixture. When desired, the water vapor
3 is evolved from a material containing water, such
as copper sulphate, mounted in the container. A
lamp having this structure is a brightly luminous,
sharply de?ned, linear light source and is useful
in television receivers in which the number of pic
4 O ture points is in excess of 100,000 per second.
In the drawing accompanying and forming part
of this speci?cation an embodiment of the in
vention is shown in which
45
Fig. 1 is a front elevational view of a cathode
glow lamp embodying the invention,
Fig. 2 is a side elevational, partly sectional view
of the lamp shown in Fig. 1, and
Fig. 3 is a top, sectional view of the lamp shown
in
Figs. 1 and 2.
56
Referring to the drawing the cathode glow lamp
comprises a tubular container 1 having a stem 2
fused thereto at one end thereof and closed at the
other end thereof by the seal-off tip 1;‘ :“Two cur
“ rent leads 4 and 5 are hermetically sealed into
‘
(Cl. 176-122)
the pinch 3 of said stem 2. A cathode 6 consist
ing of an elongated, sheet metal strip folded along
its length so that the sides thereof are at an angle
of approximately 20 to 50° to each other is
mounted on said current lead 4. Said cathode i g
is also supported by a wire 8 which is attached to
the opposite end of said cathode 6 and extends
into the exhaust tip ‘I as illustrated in Figs. 1 and
2. A plate shaped anode 9 having ?anges II on
the long sides thereof which overlap the edges of iii
the long sides of the cathode 6 is mounted in front
of said cathode 6. Said anode 9 has a slit l3
therein running along the length thereof which
slit i3 is in line with the vertex of the angular
cathode B. The anode 9 is mounted on said cur- I‘
rent lead 5 and is partially supported in said con
tainer l by said wire 8 to which it is physically
connected by the wires ll having glass heads I!
interposed therebetween to electrically separate
said anode 9 from said cathode 6. The outer sur- a
face of the cathode 6 is coated with an insulating
coating H, such as aluminum oxide, so that the
cathode glow discharge is con?ned to they inner
surface of said cathode 6. When desired, the
inner surface of the cathode 6 has an activating g5
coating, such as a barium oxide coating, thereon.
The luminous, cathode glow discharge concen
trates at or adjacent the vertex of said cathode i
and is a bright line of light. The anode 9 serves
as a screen and the light emitted by the glow dis- '0
charge passes through the slit l3. The discharge
device is thus a brightly luminous, sharply de
fined linear light source.
Said container I has a gaseous atmosphere
therein comprising a small quantity of argon and
a neon-helium mixture in which the helium pref~
erably constitutes 70% of the mixture and the
neon approximately 30% of the mixture. A cath
ode glow lamp having such a gaseous ?lling is
responsive to currents of higher frequencies than 40
similar devices having a gaseous ?lling consist
ing of or comprising a mixture of neon and helium
in which the neon is in major proportion and the
helium in minor proportion, and is useful in tele- ‘5
vision receivers in which the number of picture
points is in excess of 100,000 a second.
What we claim as new and desire to secure by
Letters Patent of the United States, is:-—
_
1. A cathode glow lamp comprising a tubular ‘0
container, a gaseous atmosphere therein, an
elongated, angular cathode and an anode sealed
therein, said cathode being a rectangular plate
folded along its length, the angle between the sides
of said cathode being between 50° and 20°, said u
2
2,116,672
anode being mounted in front of the open side of
said cathode and having a slit therein in line. with
the vertex of said cathode.
2. A cathode glow lamp comprising a tubular
container, a gaseous atmosphere therein, an
elongated, angular cathode and an anode sealed
therein, said cathode being a rectangular plate
folded along its length, the angle between the sides
of said cathode being between 50° and 20°, said
10 anode being mounted in front of the open side of
said cathode and having a slit therein in line
with the vertex of said cathode, said gaseous
atmosphere comprising a mixture of neon and
helium in which the percentage of helium is
15 greater than about 50%.
' 3. A cathode glow lamp comprising a tubular
container, a gaseous atmosphere therein, an
elongated, angular cathode and an anode sealed
therein, said cathode being a rectangular plate
folded along its length, the angle between the sides
of said cathode being between 50 and 20°, said
anode being mounted in front of the open side
of said cathode and having a slit therein in line
with the vertex of said cathode, said gaseous at
mosphere comprising a mixture of neon and
helium in which the helium is approximately 70%
and the neon approximately 30% of the mixture.
4. A cathode glow lamp comprising a tubular
container, a gaseous atmosphere therein, an
elongated, angular cathode and an anode sealed
therein, said cathode being a rectangular plate 10
folded along its length, the angle between the
sides of said cathode being between 50 and 20°,
said anode being mounted in front of the open
side of said cathode and having a slit therein in
line with the vertex of said cathode, said gaseous
atmosphere comprising a mixture of neon and
helium in which the percentage of helium is
greater than about 50% and a small quantity of
other gas in said container.
HANS EWEST.
20
GEORG GAIDIES.
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