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Aug. 3, 1948.,
.
2,446,374
K. s. KNOL ET AL
VERY HIGH FREQUENCY ELECTRIC DISCHARGE TUBE
Filed April 22, 1946
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Patented Aug. 3, 1948
2,446,374
UNITED "STATES PATENT ' orrics 1
VERY HIGH FREQUENCY ELECTRIC
DISCHARGE TUBE‘.
Kornelis Swier Knol and Johannes Marinus van
Hofweegen, Eindhoven, Netherlands, assignors,
by mesne assignments, to Hartford National
Bank and Trust Company, Hartford, Conn, as
trustee
Application April 22, 1946, Serial No. 663,838
In the Netherlands December 4, 1942
Section 1, Public Law 690, August s, 1946
Patent-expires December 4, 19621
4 Claims. (Cl. 250-275)
1
This invention relates to an electric discharge
tubevfor short and very short waves, for instance
smaller than 1 m., and more particularly to the
construction of an anode for a tube of this kind,
in which the supply conductor for the anode is
secured to this electrode about midway between
the ends of the latter.
In tubes for short and very short waves the
path which the electrons have to cover from the
active surface of the anode to this point of at 10
2
Fig. 2 illustrates an end view of. an alternate
construction of an electric discharge tube ,ac
cording to the invention.
Referring to Fig. 1 there is shown an electric
discharge tube comprising an envelope I0, hav
ing arranged therein, a cathode ~l| supported in
the envelope by tube pin I2 and heated by a suit
able heating element (not shown)_ to which tube
pins i3, #3 lead. Surrounding cathode ii are,
a grid M to which electrical connection is made
tachment is of'importance. (In fact, due to
by pin I 5 in the top of envelope IE], and an anode
the skin e?ect, the electric current passes along
I supported in envelope It by means of tube
the surface of the conductors.) _With an anode
pin 2, which pin also serves to provide electrical
where this point lies about halfway the ends,
connection to anode I. It is understood that pins
this path from the inner surface of the anode 15 2, l2, l3 and is may be supported in the en~
to both ends is about equal, 1. e. half the length
velope by any means known to the art and may
of the anode. It now appears that when using
be spaced in any way, the separation of grid,
such anodes for tubes designed for very short
cathode and anode pins as shown in Fig. 1 be
waves, more particularly waves of the order of
ing preferable for use with very high frequency
magnitude of decimetres and centimetres, these 20 electric discharge tubes. In Figure 1 the refer
distances are too large, so that a limit is put to
the use thereof. The present invention enables
the operation of tubes at very short wave lengths
by means of apertures provided in the surface
of a plate-shaped anode of an electric discharge 25
ence number I represents the anode proper, 2
being the supply conductor which is secured to
the anode at 3 and is secured in the wall of en
velope ll] of the discharge tube according to the
invention. In the anode surface are provided
tube, in which anode the supply conductor pref
slits 4 which extend from the edge inwards close
erably contacts with it about midway between the
to the point of attachment of the supply con
ends thereof, the apertures being provided in
ductor. In this way the distance from the point
the vicinity of this point in the anode surface.
3 to the inner side of the anode is very small and
This improvement may consist of apertures pro— 80 the electrons need only travel the distance 5.
vided in the immediate vicinity of the point of
Figure 2 represents diagrammatically how a
attachment, but preferably slits or grooves are
provided which extend from the ends towards
the middle close to the said point. Thus it is en
sured that the distance from the point, where 35
slit in the anode can be covered. In this ?gure
the reference number 6 represents the anode
proper which is furnished with slits l. The anode
itself is provided over a certain length with a
the supply conductor is secured to the anode, to
rim 8 which merges into parts 9 covering the
the active surface (1. e. the inner surface) of the
slits 1 so that electrons cannot emerge through
anode is very short, and the construction of this
the slits. In this way a very simple construc
electrode has been found suitable for use in tubes
tion is obtained, in which the above-mentioned
for waves of the order of magnitude of deci 40 drawbacks are obviated without involving other
metres and centimetres.
di?'iculties.
Since electrons issuing from the cathode are
What we claim is:
able to emerge through the slits or apertures,
1. An electric discharge tube particularly
which may involve additional damping, a screen
adapted for operation at frequencies above 300
or shield is provided, according to a particular 45 megacycles comprising, a cathode, a tubular
embodiment of the present invention, beyond
anode surrounding said cathode, and a supply
these grooves or slits, which screen or shield
lead attached to said anode on the surface there
covers the apertures and is preferably electrically
of remote from said cathode, said supply lead
connected to the anode.
being attached to said anode at a point approxi
The invention will now be more fully explained 50 mately midway between the ends of the anode
by reference to the accompanying drawing in
and said anode being provided with a slit por
which
tion extending from opposite ends of the anode
Figure 1 represents a side view, partly in cross
to a point adjacent to the point of attachment
section, of one form of construction of an elec
of said supply lead to said anode, and a shielding
tric discharge tube according to the invention,
55 member secured to said anode and positioned
3
2,446,374
4
over and spaced from said slit portion to prevent
point of attachment of said supply lead to said
the passage of electrons from said cathode into
space beyond said anode, thereby to shorten the
anode, and a shielding member secured to said
anode and positioned over and spaced from said
slit portion to prevent the passage of electrons
from said cathode into space beyond said anode.
4. An electric discharge tube particularly
adapted for operation at frequencies above 300
megacycles comprising, a cathode, a tubular
anode. surrounding said cathode, and a supply
surface conducting path from the supply lead
to the surface of said anode.
2. An electric discharge tube
particularly
adapted for operation at frequencies above 300 '
megacycles comprising, a cathode, a tubular
anode surrounding said cathode, and a supply
lead attached to said anode on the surface there 10 lead attached to said anode on the surface there
of remote from said cathode, said supply lead,
of remote from said cathode, said anode being
being ‘attached to said anode at a point approxi
provided with a slit extending longitudinally
mately midway between the ends of the anode
along the anode to a point adjacent to the point
and said anode being provided with slits extend
ing from each end of the anode to points adja
cent to the point of attachment of said supply
lead to said anode, and a shielding member se
cured to said anode and positioned over and
spaced from said slits to prevent passage of elec
trons from said cathode into space beyond said
anode, thereby to shorten the surface conduct
ing path from the supply lead to the inner surface
of said anode.
3. An electric discharge tube particularly
adapted for operation at frequencies above 300
meg-acycles comprising, a cathode, a, tubular
anode surrounding said cathode, and a supply
lead attached to said anode on the surface there
of remote from said cathode, said supply lead
being attached to said anode at a point approxi
mately midway between the ends of the anode
and said anode being provided with a slit por
tion free from obstruction extending from oppo
site ends of the anode to a ‘point adjacent to the
of attachment of said supply lead to said anode,
15 a rim arranged on one edge of said slit, and a
shielding member secured to said rim and posi
tioned over and spaced from said slit to prevent
.passage of electrons from said cathode into
space beyond said anode, said supply lead being
20 attached to said anode at a point approximately
midway between the ends of the anode thereby
to shorten the surface conducting path between
said lead and the inner surface of said anode.
KO-RNELIS SWlCER. KNOL.
JOHANNES MARINUS VAN HOFWEEGEN.
25
REFERENCES CITED
The following references are of record in the
file of this patent:
30
Number
‘UNITED STATES PATENTS
Name
Date
1,567,260
1,672,483
Garity ___________ __ Dec. 29, 1925
Crowley __________ __ June 5, 1928
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