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Патент USA US2407706

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SepStQ 17, 1946.
'
‘G’ R KILGQRE _
2,407,705
ELECTRON DISCHARGE DEVIQE
Filed April 24, 1942
152933’
2 sheets-sheet 1
‘saw-.4
5'6
67
+
1 Sept" 17, 1946- I
e. R. KILGORE"
v
2,467,75 .
ELECTRON DISCHARGE DEVICE
Filed ‘April 24, 1942
\
I
2 Sheeté-Sheefh _2
ZAMJGS
Patentecl Sept. 17, 194-6
UNITED STATES EATENT‘ QZFFLCE.
2,407,705’
ELECTRON DISCHARGE DEVICE
George Ross'Kilgore, Verona, N; 3;, assignor to
Radio Corporation of Americana corporation of
Delaware
Application April 24, 1942, Serial No. 440,298‘
19 Claims. (Cl. 315—12)
1
My invention relates to electron discharge de
vices utilizing periodic electron beam de?ection
and particularly useful at ultra high frequencies.
In conventional electron discharge devices of
the type under consideration, a beam of elec
trons is directed between a pair of de?ecting elec
trodes toward an apertured electrode, behind
2
provide ‘an electron discharge device of the beam
de?ection type utilizing additive multiple de?ec
tion and secondary emission ampli?cation for.
producing a tube having very high transconduct
ance.
A still further objector" my invention is to. pro
vide an electron discharge device of the beam
de?ection type utilizing a novel type of combined
which is usually placed a collector. Alternating
high frequency voltages are applied to the de?ect
electrode system and circuit useful at ultra high
electron discharge device of - the beam de?ection
the indirectly heated cathode 13 provided with
ing electrodes to cause the electron beam to be de-' 10 frequencies and having a high transconducta-nce.
The novel features which I believe to be char
?ected across the aperture to thus control the
acteristic of my invention are set forth with
instantaneous ?ow‘ of electron current to the
particularity in the appended claims, but the-in
collector, which may be used as an output elec
Vention itself will best be understood by reference
trode. In such conventional types of tubes the
to the following description taken in connection
de?ecting sensitivity drops off as the frequency
with the accompanying drawings in which Fig
at which the tube is operated is increased due
ure 1 is a longitudinal section of one form of'an
to electron transit time effects. Efforts have been
electron discharge device made according to my
made to increase the deflection sensitivity or the
invention and its associated circuit, Figure 2. is
transconductance of the tube but such efforts
a transverse section taken along the line 2—2 of
have not met'with a great deal of success. Con
Figure 1, Figure 3 is a longitudinal section of a
ventional tubes of this kind are also subject to
modi?cation of an electron discharge device
the limitation that when operated at ultra high
made according to my invention, Figure 4 is a
frequencies the input circuit tends to be of low'
transverse section taken along the line 4.—4 of
resonant impedance resulting in an excessive
Figure~3, Figure- 5‘ is an enlarged sectional view
amount of power being required to drive the tube.
taken along the line 5-5 of Figure 3, Figure 6'is‘a
This decreases‘ the effective power gain of the
perspective of the electrode system and high fre
tube when operated as an ampli?er, Funda
quency circuit made according to my invention
mental causes of low resonant impedance in
and utilized in the tube shown in Figure 3, and
clude, among other things, radiation and resist
Figure 7 is a schematic longitudinal section of
ance losses due to high circulating current in
the tube shown in Figure 3 made according to
electrodes and leads; Electron loading also re
my invention and a diagram of its associated
sults from the interaction of the electron stream
circuit.
and the circuits connected to the tube and elec
Referring to Figure 1, an electron discharge
trodes and‘ may cause undesired degenerative
device made according to my invention includes
and regenerative effects caused by lead imped
an evacuated envelope lilv having the usual press
ances common to more than one circuit.
H and base l2. Supported from this press is
It is an object of my invention to provide an
leads 13’ which act as the cathode lead and
type, which is particularly suitable for use at ultra
high frequencies and which has a comparatively 40 heater leads. Mounted at the other end of the
envelope is a collector l4 toward which the beam
high transconductance.
is directed through the intermediate electrodes
It is another object of my invention to provide
positioned between the cathode and collector.
such a device utilizing an input circuit having
Adjacent the cathode is the apertured beam
high resonant impedance, thus making more ef
45 forming and focusing electrode in the form of
fective the use‘ of the driving power.
a disc 15 electrically connected to the lead I5’.
A’ further object of my invention is to provide
The deflecting electrode system includes the tu
such a device in which undesired coupling due
bular member [6 separated into compartments
to common leads and ineffective shielding be
or chambers by means of the transverse con
tween circuits. is reduced to a minimum.
Another speci?c object‘ of, my invention is to 50 ducting elements ll, I8 and I9 provided with the
aligned apertures IT’, IS’ and i9’ through which
provide an electron discharge device of the beam
the beam from the cathode is directed during
de?ection type, utilizing’ multiple additive de
operation of the electron discharge device. The
flection for providing a tube having high trans
beam
in passing through this de?ecting electrode
conductance.
A still further object of my invention is‘ to 55 system. passes through another apertured elec
2,407,705’
3
4
trode 20 having the aperture 20’ and connected
to the lead and support 2!. Positioned between
this apertured electrode and the collector is the
de?ected in the same direction. Since the ele
ments are cross-connected and since centers are
electron multiplying system comprising elec
trodes 22, 23, 2Q, 25, 26 and screen 21. The ele
ment 20” maintained at ground potential by
positioned a half period apart, the voltages be
tween de?ecting electrodes will always be in the
5
proper phase to cause additive de?ection of any
group of electrons in the same direction.
The amount of de?ection across apertured ele
being connected to electrode 25 causes the beam
to be directed against the surface of the element
22 to cause the emission of secondary electrons
when struck by the beam of primary electrons.
These electron multiplying electrodes may be
coated with the usual material for inducing a
ment I9 at any particular instant determines
the amount of current ?owing through the aper
ture so that the input voltage may be reproduced
and the output much ampli?ed because of the
high transconductance of the tube. This ampli
?cation is still further increased by means of the
high ratio of primary-to-secondary electrons.
multiplier system positioned between the aper
In accordance with my invention, I position be
tween the apertured conducting members [8 and
tured member 2!] and collector 14, the output
being taken between the collector l4 and screen
27 by means of the output circuit comprising
transformer 52 and condenser 43. If it is desired
ii) the successively positioned oppositely disposed
de?ecting electrode elements 3F}, 3! and 32.. The
distance between the centers of these de?ecting
to utilize the device as a converter it would be
elements is equal to the distance traveled by an
electron during a half period of the controlling 20 possible to do this by introducing both signal
and local oscillator voltages on the input or
voltage applied to these de?ecting electrodes.
Lecher wires 34 and 35.
These elements preferably. have a dimension in
In Figure 3 is shown a modi?cation of my in
the direction of travel of the electron beam equal
vention in which the input circuit is self-con
approximately to the distance travelled by an
electron during a half period or 7r radians. The 25 tained and in which the input circuit is substan
tially completely shielded from the cathode elec
successive elements are cross connected so that
trode as well as the output electrode system. This
the phase relationship between the electron beam
input circuit incorporates a modi?ed form of the
and the voltage applied to the controlling elec
multiple de?ection arrangement shown in Fig
trode elements will cause additive de?ection, that
is de?ection in the same direction.
30 ure 1.
In this embodiment the evacuated envelope 50
The lines 35 and. 35 are connected to the signal
is provided with the usual press 5| and base 5|’.
input circuit as shown and to the voltage divider
Supported on the press is an indirectly heated
arrangement 33 through the resistance 3'! and 38
cathode 52 provided with a cathode lead 53. Next
which cooperate with the shorting condenser 56.
This arrangement permits not only tuning of the 35 adjacent the cathode is the beam forming and
focusing electrode 54 supported by means of a
lines 34 and 35 but provides the necessary direct
glass bead support construction 54’.
voltages for applying the proper biasing or po
larizing voltages to the de?ecting electrodes to
center the electron beam. The proper positive
The elec
trode 54 and cathode 52 are electrically connected
as shown in Figure 5. Mounted at the other end
voltage is applied to de?ecting electrode system 40 of the envelope is the collector 55 provided with
supporting leads 55’. Positioned between the
I6 by means of the conductor 3:3‘, and the voltage
focusing electrode 54 and collector 55 is the beam
de?ecting electrode system comprising the tubu
48, the voltages increasing in a positive direction
lar member 56 having extending thereacross the
from the apertured member 725 to the collector l4.
By-passing condensers, such as All, provide paths 45 apertured disc-like conducting elements or parti
tions 5?, 58 and 59 provided with the elongated
for the radio frequency currents. The output is
slots 5?’, 58’ and 59’ which are aligned with
taken between collector M and screen 21 across
each other and with the aperture 54’ in the
the circuit comprising the primary of transformer
focusing element 54. The length of these elon
42 and condenser 63, the proper biasing voltage
source for the multiplier elements is shown at
on the collector being provided by means of con—
50 gated slots varies as shown for the purpose of
ductor 43’, by-passing condenser 44 completing
the radio frequency circuit and permitting differ
ent positive voltages to be applied to the member
15 and the collector [6.
In operation a beam of electrons is directed 55
from the cathode i3 through the beam forming
and electron lens system formed by elements i5
and elements ll and I8. By properly position
ing de?ecting elements 35 with respect to aper
tured element- l8 another electron lens can be 60
provided between these elements to properly
focus the beam on the aperture l9’ of apertured
element 59. The beam may also be properly di
rected by applying the bias to the three de?ecting
elements, an odd number of elements being pro 65
vided for this purpose. The beam is de?ected
across aperture it’ when an input signal voltage
or control voltage is applied through the‘ conduc
tors
and 35. The transit time of the electrons
is so matched to the de?ecting elementsthat any 70
electrons which may have been de?ected in an
upward direction by de?ecting electrodes 35 will
arrive between elements 3! a half period later
and again be de?ected in the same direction,
properly forming the beam.
In accordance with my invention the de?ecting
electrode system and input circuit are combined
into a unitary structure which simpli?es the con
struction and permits eiiective shielding of the
input circuit and electrodes from the output
electrode system. The tubular member 56 is pro
vided with the extensions 60 and BI and it is
within these extensions that the combined de
?ecting electrode system and circuit are mounted
and supported by means of glass bead supporting
structures 63 and 63’.
As best shown in Figure 6, the de?ecting elec
trode system comprises an elongated rectangu
larly shaped member of ribbon-like construction
having intermediate its ends inwardly extending
sections 64 provided with slots 85 for forming
de?ecting elements 64’ between said slots. The
distance from the center line extending trans
versely of the slotted portion to an end of the
rectangularly shaped member is equal to a quar
ter-wave of the received or controlling voltage,
so that in effect each half acts like a Lecher wire
system of quarter wave-length, the voltage peak
likewise arriving between elements 32 to be again 75 appearing between the inwardly extending por
2,461,765‘
6.
and‘ anl output electrodesystemlfor" receiving:
said electrons, andmeans positioned between the
tionsi-?lllin-whichi the de?ecting electrode ele
ments are positioned», The voltage is fedto this’
circuit arrangementbymeans of leads 66 which
may’ be‘ connected to a transmission line system,
for example, of the coaxial cable type. The dis
tance between centers of the elements 64’ is equal
to the distancethat- an electron travels during
one'periodoffthe applied controlling voltage or
electrically to 25+ radians, the elements having a
widthlin the direction of travel of the electron 10
cathode means and the output‘ electrode 7 system
through which- said: electron‘ lo‘e'arn'v is directed,
and including- a1 plurality of'successivei pairsof
oppositely’ disposed deflecting elements between!
which'th'e beam- is directed, saidi'elemen'ts being
adaptedl'to'liave an alternating control ‘voltage of
high‘ frequency applied thereto, the spacing be
tween the centers of' the elements of5 different‘
pairs being equal to the distance travelled‘ by an‘
beam substantially equalv to’ a half-period or 1r
electron during a cycle of the applied controlling’
radians. This arrangement makes it possible to
voltage.
connect‘ all elements on'the same side of the
2. An electron discharge device having cathode
beam, electrically together, and to the same side
of th'e'L'echer‘ wire system formed by the struc 15 means for providing a directed beam of electrons;
and an output electrode system for receiving said
tureG'ZQ
electrons, and means’ positioned between the
‘To-properly center the‘ beam‘between the de
cathode means and the output electrode system"
?ecting- electrode elements and- to direct it
through the apertured-member' 59, I provide‘ a
through which said electron beam is directed? and
including a plurality of successive'pairs of 'oppopair of beam directing‘elements 6‘! in the cham
ber between partitions-5i? andv58," the'proper bias
sitely disposed deflecting elements between which
ing voltages‘ being applied by means of the
the beam‘ is vdirected, said‘elements ‘being adapted:
to have an alternating control voltage of high
frequency applied thereto, the spacing between
leads 68.
The schematic wiring diagram-shown- in Fig
ure’ '7 illustratesthe connections tolthe voltage 25 the centers of the elements of different'pairs beingv _
equal to the distance travelled by an electron
divider system‘ ‘H and the voltage or potential
during a cycle of the applied controlling voltage,
source Him the beam directing electrodes 61
all of the elements on the'same side of the beam‘
and" the various other electrodes. The output is
path being electrically connected together.
takenbetween the collector 55' and the trans
3.1 An electron discharge device having cathode‘
verse conducting member 59 supported by tubu 30
means‘ for providing a directed beam of electrons?
lar‘element 5%? across the inductance element 12.
It'will be observed that a wire or conductor 591
and an output electrode system for receiving said
electrons, and means positioned between the
cathode means and the output electrode system»
sired ' output 1 characteristics.
35 through which said electron beam is directed, and
including a plurality of successive pairs of op"po-"v
In operation the electron beam formed. by
isipositioned centrally of the aperture to‘provide
the double apertured e?ect for obtaining‘the de
sitely disposed‘ de?ecting elements between which:
cathode 52~ and-focusing element 56 is directed
through aperture 5?" betweenvv the beam direct
ing- elements 6?, upon which the bias may be
properly adjusted to center the beam on aperture
58" and to‘ direct it through the de?ecting elec
trode system between'the pairs of successively po
sitioned oppositely disposed beam de?ecting ele
ments Ed’. As the electron beam passes between
the elements it comes under the influence of each
successive pair’ of elements for- approximately a
the beam is directed, said elements being adapted'i
to have an alternating control’ voltage of high
frequency applied‘ thereto, the spacing between
the centers of the elements of different pairs
being equal to' the‘ distance travelled by an elec-v
tron during a cycle of the applied controllingl
voltage, all‘of the elements on the same‘ side of
vi
the beam path being electrically connected to
gether, and‘ a; conducting loop connected be
tween the elements on opposite sides’ of the beam"
half. period at half-period intervals. Inasmuchi
asv the voltage. during thelhalf-period intervals‘
passes through 180“, de?ection of the beam will
be additive‘o'r in the same. direction, thus e?ece
tive transconductance is increased substantially
in? direct ratio to the number of successive pairs
of‘ de?ecting‘ elements. In. the arrangement
shown the input circuit is combined‘ with the de
?ecting elements to greatly simplify this struc
means and the receiving means through which~
said electron beam is directed to said receiving
means, and including a plurality of successive
rare; to make more e?ective the de?ection con
pairs ofv oppositely disposed de?ecting elements‘
trbL-and because of the shielding arrangement‘
of‘ the tubular member 56 and extensions 69 and
high frequency applied thereto, the spacing be
Gil the input circuit is well shielded from the out
put electrode system, so that little if any inter-'
action results.
While I' have indicated the preferred embodi
m‘ents of'my invention of which Iam now aware
and have also indicated only one speci?c appli
cation'for which my invention may be employed,
it will be apparent that my invention is by no
means limited to the exact forms illustrated or
the use indicated, but that many variations may
be made inthe particular structure used and the
purpose for which it is employed without depart
path.
4. An electron discharge device having cathode
means for providing a directed beam of elece
trons, means for receiving saidv electrons, aper:
tured means‘ positioned between the cathode
adapted to have an alternating control voltage of
tween the centers of the elements being equal to‘
the distance travelled by an electron in a cycle.
of the applied controlling voltage, each pair of’
deflecting elements being spaced from the‘ next'
succeeding pair of elements a distance equal to
the dimension of said elements in the direction
of travel'of the electron beam.
5'. An electron discharge device having a cathe
ode for supplying a beam of electrons‘and an‘
output electrode system toward which said elec
trons are directed, and means positioned between
the cathode and the output electrode system for
subjecting said beam to additive successive‘ de
?ection and including a conducting enclosure
through
which the beam of electrons is directed,‘
WhatI claim as new is:
said conducting enclosure having transverse ele-"
15. An‘eleotron discharge device having cathode
means for providing addirected beam of electrons 75 ments. provided with aligned apertureaanq a.
ing from the scope of my invention as set forth
in‘ the appended claims.
2,407,705
7
8
plurality of successive pairs of oppositely dis
posed de?ecting elements positioned between the
transverse elements and between which said
beam of electrons is directed during operation of
said electron discharge device, the spacing be
tween the centers of said elements being equal
ly disposed slots forming a plurality of opposite
ly' disposed de?ecting elements through which
the beam of electrons is directed.
10. An electron discharge device having a cath
ode means for supplying a directed beam of elec
trons, and a collector toward which said electrons
are directed, and a deflecting electrode means po
sitioned between the cathode means and the col
to the distance travelled by an electron in a cycle
of the applied alternating control voltage said
output electrode system including an apertured
lector and including a conducting enclosing
electrode through which the beam of electrons is 10 member having a plurality of transverse ele
ments provided with aligned apertures through
directed, and a plurality of secondary emitting
electrode elements upon which said beam is di
rected.
6. An electron discharge device having a cath
ode means for supplying a directed beam of elec
trons, and an output electrode system toward
which said beam of electrons is directed, and a
de?ecting electrode system comprising an elon
gated rectangular shaped conducting loop hav
ing intermediate its ends a plurality of oppositely
disposed slots for forming a plurality of oppo
which said electrons are directed, a tubular con
sitely disposed de?ecting elements through which
ducting member positioned between the cathode
and output electrode system through which said
the beam of electrons is directed, said conduct
beam is directed, and having a plurality of trans
member and extending through the sides of the
conducting enclosing member and extensions on
said conducting enclosing member for shielding
the ends of said conducting loop.
11, An electron discharge device having a cath
ing loop lying within said conducting enclosing
verse conducting elements having apertures
aligned and through which the beam of electrons
is directed, and a plurality of successively posi
tioned pairs of de?ecting electrode elements po
sitioned between the transverse apertured ele
ments, said pairs of de?ecting electrode elements
ode means for supplying a directed beam of elec
trons, and a collector toward which said electrons
are directed, and a de?ecting electrode means po
sitioned between the cathode means and the col
being cross connected with the next succeeding
pair of de?ecting electrode elements.
7. An electron discharge device having a cath
lector and including a conducting enclosing mem
ber having a plurality of transverse elements pro
ode means for supplying a directed beam of elec
vided with aligned apertures through which said
beam of electrons is directed, and a de?ecting
electrode system comprising an elongated rec
trons, and an output :electrode system toward
which said electrons are directed, a tubular con
ducting member positioned between the cathode
tangular shaped conducting loop having inter
and output electrode system through which said
beam is directed, and having a plurality of trans 35 mediate its ends a plurality of oppositely disposed
slots for forming a plurality of oppositely disposed
verse conducting elements having apertures
de?ecting elements through which the beam of
aligned and through which the beam of electrons
electrons is directed, said conducting loop lying
is directed, and a plurality of successively posi
within and extending through the sides of the
tioned pairs of de?ecting electrode elements po
sitioned between the transverse apertured ele 40 conducting enclosing member and extensions on
said conducting enclosing member for shielding
ments, said pairs of de?ecting electrode elements
the ends of said conducting loop, and a pair of
being cross connected with the next succeeding
pair of de?ecting electrode elements, said output _
electrode system including an apertured elec
trode and a collector.
8; An electron discharge device having a cath
ode means for supplying a directed beam of elec
trons, and an output electrode system toward
which said electrons are directed, a tubular con
beam directing electrodes positioned between the
cathode means and the de?ecting electrode sys
,
tem.
12. An electron discharge device having cathode
means for supplying a directed beam of electrons
and electrode means for receiving said beam of
electrons, an apertured element positioned ad
jacent the receiving electrode means and having
ducting member positioned between the cathode
an aperture registering with said receiving elec
and output electrode system through which said
trode means, a de?ecting electrode system posi
beam is directed, and having a plurality of trans
verse conducting elements having apertures
tioned between the cathode means and the aper
tured means and including an elongated rectan
aligned and through which the beam of electrons
_ gularly shaped conducting member through which
is directed, and a plurality of successively posi
the beam of electrons is directed, and having slots
tioned pairs of de?ecting electrode elements po
on opposite sides of said member intermediate the
sitioned between the transverse apertured ele
ends of said member for providing a plurality of
ments, said pairs of de?ecting electrode elements
successively positioned oppositely disposed pairs
being cross connected with the next succeeding
pair of de?ecting electrode elements, said output 60 of de?ecting elements between which said beam
passes.
electrode system including a secondary electron
emitting means.
13. An electron discharge device having cath
9. An electron discharge device having a cath
ode means for supplying a directed beam of elec
trons and electrode means for receiving said beam
ode means for supplying a directed beam of elec
of electrons, an apertured element positioned ad
trons, and a collector toward which said elec
jacent the receiving electrode means and having
trons are directed, and a de?ecting electrode
an aperture registering with said receiving elec
means positioned between the cathode means and
trode means, a de?ecting electrode system posi
the collector and including a conducting enclos~
tioned between the cathode means and the aper
ing member having a plurality of transverse ele
ments provided with aligned apertures through 70 tured means and including an elongated rectan
which said beam of electrons is directed, and a
gularly shaped conducting member through
de?ecting electrode system within said conduct
which the beam of electrons is directed, said
ing enclosing member and comprising an elon
gated rectangular shaped conducting loop hav
ing intermediate its ends a plurality of opposite
member having slots on opposite sides intermedi
ate the ends of said member for providing a
75 plurality of successively positioned oppositely dis
2,407,705
10
posed pairs of de?ecting elements between which
said beam passes, the distance between centers
of successive pairs of de?ecting elements being
equal to the distance travelled by an electron
during a cycle of the applied controlling voltage.
14. An electron discharge device having cath
ode means for supplying a directed beam of elec
trons and electrode means for receiving said beam
ing a plurality of successively positioned de?ect
ing electrode elements intermediate the ends of
said loop and positioned on opposite sides of the
path of said electron beam, and shielding exten
sions supported on said tubular member and sur
rounding the ends of said conducting loop.
17. An electron discharge device having a cath
ode for supplying electrons, and means for form
ing said electrons into a directed beam, and
of electrons, an apertured element positioned ad
jacent the receiving electrode means and hav 10 means for receiving said beam, means interme
diate said beam forming means and said beam
ing an aperture registering with said receiving
electrode means, a de?ecting electrode system p0
sitioned between the cathode means and the ap
ertured means and including an elongated rec
tangularly shaped conducting member through
which the beam of electrons is directed, said
member having slots on opposite sides intermedi
ate the ends of said member for providing a
plurality of successively positioned oppositely dis
posed pairs of deflecting elements between which
said beam passes, and means including rod-like
elements positioned between the cathode means
receiving means and including a tubular mem
her having its longitudinal axis coinciding with
the path of the electron beam between the oath
ode and the receiving means and provided with
a plurality of transverse conducting members
having aligned apertures through which the beam
is directed, and a beam deflecting electrode sys
tem positioned between a pair of said transverse
members, and including an elongated rectangu
larly shaped conducting loop extending through
opposite sides of the tubular member and hav
ing a plurality of successively positioned de?ect
and deflecting electrode system for controlling the
ing electrode elements intermediate the ends of
direction of the electron beam between the oath
ode and the de?ecting electrode system.
25 said loop and positioned on opposite sides of the
path of said electron beam, and shielding exten
15. An electron discharge device having cath
sions supported on said tubular member and sur
ode means for supplying a directed beam of elec
rounding the ends of said conducting loop.
trons and electrode means for receiving said beam
18. An electron discharge device having a cath
of electrons, an apertur-ed element positioned ad
jacent the receiving electrode means and having 30 ode for supplying a beam of electrons, and means
for receiving said beam of electrons, an aper-‘
an aperture registering with said receiving elec
tured transverse conducting member between said
trode means, a de?ecting electrode system po
cathode and means for receiving said beam of
sitioned between the cathode means and the ap
electrons, a beam de?ecting electrode system po
ertured means and including an elongated rec
tangularly shaped conducting ribbon-like loop 35 sitioned between the apertured conducting mem
her and said cathode, and including an elongated
through which the beam of electrons is directed,
rectangularly shaped conducting loop having a
said loop having slots on opposite sides intermedi
plurality of successively positioned oppositely dis
ate the ends of said loop for providing a plu
posed slots on opposite sides thereof forming a
rality of successively positioned oppositely dis
posed pairs of deflecting elements between which
said beam passes, the loop having thickened por
plurality of de?ecting electrode elements inter
mediate the ends of said loop and between which
elements the electron beam is directed during
operation of said electron discharge device.
19. An ‘electron discharge device having cath
tions in which said slots are formed.
16. An electron discharge device having a cath
ode for supplying electrons, and means for form
ing said electrons into a directed beam, and means 45 ode means for providing a directed beam of elec
trons, and an output electrode system for re
ceiving said electrons, means positioned between
the cathode means and the output electrode sys
tem through which the electron beam is directed
longitudinal axis coinciding with the path of the
electron beam and provided with a plurality of 50 and including a plurality of successive pairs of
for receiving said beam, means intermediate said
beam forming means and said beam receiving
means and including a tubular member having its
transverse conducting members having aligned
apertures through which the beam is directed,
a pair or" beam directing electrodes positioned be
tween two of said transverse conducting members
and a beam de?ecting electrode system positioned
between another pair of transverse conducting
members, and including an elongated rectangu
larly shaped conducting loop extending through
opposite sides of the tubular member and hav
oppositely disposed de?ecting electrodes through
which said beam is directed, said elements being
adapted to have an alternating control voltage
of high frequency applied thereto, the spacing
between the elements of different pairs being
equal to the distance travelled by an electron
during a multiple of cycles of the applied con
trolling voltage.
GEORGE ROSS KILGORE.
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