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Sept. 10,. 1946. -
I
‘4.5.. |. CAIRNS "
'
2,407,607’ ‘
ELECTRON_ DISCHARGE DEV-ICE. EMPLOYING HOLLOW-RESONATOR
Filed‘March 13-, 1944
_ Jo'm EJwin IQ-éllston Cairns
'
RTTORNEY
‘
2,407,607
Patented Sept. 10, 1946
UNITED STATES
'
ATENT
OFFICE
2,497,607
ELECTRON DISCHARGE DEVICE EMPLOYING
HOLLOW RESONATOR
John Edwin Ingliston Cairns, Chalfont-St. Peter,
England, assignor to Electric & Musical Indus
tries Limited, Hayes, Middlesex, England, a
company of Great Britain
Application March 13, 19%, Serial No. 526,184
In Great Britain August 8,1941
4 Claims. (Cl. 315-5)
1
This invention relates to electron discharge
devices of the type employing a hollow resonator.
and having a re?ecting or target electrode dis
posed in proximity to the hollow resonator.
It is of course necessary in manufacturing such
devices to effect an adequate degassing operation '
of the metal parts of the device within the en
velope thereof and unless recourse may be had to
eddy~current heating of the metal parts the de
gassing is a slow process. Usually the re?ecting ll]
2
Figure 2 illustrates a similar View of an electron
discharge device on an enlarged scale embodying
further form of re?ecting or target electrode
according to the invention.
>
‘
Referring to Figure 1 of the drawing, ‘the ref
erence numeral 3 indicates the envelope oi the de
vice the end caps or closures of which are
omitted. The hollow resonator comprises a pair
of discs t and 5 which are sealed to the envelope,
the peripheries of the discs being closed by an
annular metallic rim, not shown, to complete the
or target electrode comprises a small ?at or par
formation of the resonator. The discs 4 and 5
tially spherical electrode which is arranged close
at their central portions within the envelope 3
to the metallic structure of an adjacent hollow
are re-entrant and are provided with oppositely
resonator. When eddy-current heating of the
hollow resonator for degassing purposes is effect- 1 ., disposed apertures in known manner. An elec
tron gun 55 illustrated diagrammatically is sup
ed, it is of course necessary that there?ecting
ported in the envelope by a pair of mica discs ‘I.
or target electrode should also become heated
rl‘he electron gun is adapted to produce a beam
for degassing purposes, but it is found that owing ,
of electrons which is caused to pass through the
to the large metallic area of the hollow resonator
very little current is induced in the re?ecting or " apertures in the hollow resonator into the vicinity
of a reflecting or target electrode 8, which is dis
target electrode with the result that this elec
posed in proximity to the disc 5 of the resonator.
trode does not become adequately degassed.
The re?ecting or target electrode 3 is of partially
The present invention is concerned with im
spherical form and is supported by a support rod
proving the construction of the reflecting or tar
H3 which, in turn, is carried by a pair of mica
get electrode to enable it to be adequately heated
discs ii. As mentioned above, it is foundwith
for degassing purposes when the resonator is
known forms of re?ecting or target'electrodes
heated by eddy currents.
that, when it is desired to effect heating thereof
According to the invention there is provided
an electron discharge device employing a hollow
resonator disposed partly or wholly within an
envelope and having a reflecting or target elec
trode also within said envelope and in such close
proximity to said resonator that owing to the
larger mass of said resonator little current can
be induced in the re?ecting or target electrode
when subjected to eddy current heating simul
taneously with the resonator and wherein said
re?ecting or target electrode is provided with one
for degassing purposes by eddy-current heating,
very little current is induced in the re?ecting or
target electrode due to the larger adjacent mass
of the resonator. According to the invention, for
the purpose of enabling the re?ecting or target
electrode to be adequately heated by eddy cur
rents simultaneously with the heating of the res
onator, the periphery of the electrode 8 is pro
vided with a metallic extension !2 which projects
away from the resonator, as shown, so as to pro
vide a substantially larger area than is the case
or more metallic extensions projecting away from
the resonator for the purpose of providing a sub 40 where no such extension is employed. The ex
tension may be a cylindrical extension and may
stantially larger area than would otherwise be
be bifurcated or castellated so that, in effect, 'a
the case so that said re?ecting or target electrode
plurality of ?ns are provided projecting away
proper can be adequately heated for degassing
from the resonator. In one example, where the
purposes when the resonator and said extension
or extensions are simultaneously heated by eddy 45 diameter of the re?ecting or target electrode is
currents.
In order that the said invention may be clearly
understood and readily carried into effect, it will
now be more fully described with reference to the
accompanying drawing in which:
Figure 1 illustrates diagrammatically a por
tion of an electron dischargedevice employing
a hollow resonator and a re?ecting or target elec
trode constructed in accordance with the inven
tion, and
?ve-eighths of an inch the cylindrical extension
may be approximately three-eighths of an inch
long. Wits such a construction the hollow res
onator and the re?ecting or target electrode may
be eddy-current heated from one side of the de
vice simultaneously, and by appropriately di
mensioning the cylindrical extension it can be
arranged that the re?ecting or target electrode
55 and the hollow resonator all reach approximate
2,407,607
3
4
ly the ‘same temperature when heated simulta
neously with the same heater coil.
Figure 2 of the drawing illustrates an embodi
ment ‘of the invention in which the re?ecting or
target electrode is disposed close to ‘the aperture
in the disc 5 of the resonator.
_
electrode toward which said electrons are di
rected, and a cavity resonator extendingtrans
versely of the electron path between said cathode
and said other electrode and having apertures
through which said electrons are directed, said
In this form of
other electrode being spaced closely adjacent said
the invention the re?ecting or target electrode
resonator and having conducting means extend“
comprises a cup-shaped electrode l3 which is
ing away from said resonator, electrically and
arranged within the re-entrant portion of the
conductively connected to said other electrode
disc 5 and is supported in the end of a sleeve I4 10 whereby said other electrode may be heated by
which constitutes, in effect, an extension of the
eddy currents for degassing said other electrode,
re?ecting or target electrode l3, the extension
said conducting means comprising an elongated
extending away from the hollow resonator and
collar-like element.
.
a?ording a substantially larger area whereby the
3. An electron discharge device having an em
re?ecting or target electrode 13 can be adequately 15 velope containing a cathode for supplying a
heated for degassing purposes simultaneously
stream of electrons, and an oppositely disposed
with the heating of the discs 4 and 5 of the
electrode toward which said electrons are di
resonator. The cylindrical extension M is sup
rected, and a cavity resonator extending trans?
ported by a pair of mica discs [5.
versely of the electron path between said cathode
During eddy-current heating of the resonator '20 and said other electrode and having'apertures
and the re?ecting or target electrode, it will be
through which said electrons are directed,- said
appreciated that current will be induced in the _
other electrode being spaced closely adjacent said
resonator and having conducting means extend
electrode proper will then, in general, be heated
ing away from said resonator, electrically and
by conduction from the extensions. It is only 25 conductively connected to said other electrode
required to degas the metallic parts within the
whereby said other electrode may be heated by
envelope so that, in thiscase, the peripheral
eddy currents for degassing said other electrode,
extensions [2 and M and the re?ecting or target
rim for the resonator will be applied to the discs
4 and 5 after the degassing operation has been
completed.
‘
'
What I claim is:
1. An electron discharge device having an en
velope containing a cathode for supplying a
said conducting means comprising an elongated '
collar-like element slotted to provide a plurality
30 of fin-like elements extending parallel to the
path of the electron stream and away from said
resonator.
4. An electron discharge device having an en
velope having a cathode for ‘supplying a stream
electrode toward which said electrons are di 35 of electrons and an electrode toward which said
rected, and a cavity resonator extending trans“
electrons are directed, and a cavity resonator ex?
versely of the electron path between said cathode
tending transversely of said envelope and having
and said other electrode and having apertures
reentrant portions provided with apertures
through which said electrons are directed, said
through which the electron path extends, said
other‘ electrode being spaced closely adjacent 40 electrode being received within one of said re
'said resonator and having conducting means ex»
entrant portions but spaced from the wall of
tending away from said resonator, electrically
said resonator and having an elongated hollow
and conductively connected to said other elec~
tubular conducting member extending away from
trode whereby said other electrode may be heated
and outside of the walls of said resonator Where
by eddy currents for degassing said other e1ec~
by said other electrode may be conductively heat
trode.
ed when eddy currents are induced in said elon
2'. An electron discharge device having an en
gated conducting portion.
velope containing a cathode for supplying a
stream of electrons, and an oppositely disposed
JOHN EDWIN INGLISTON CAIRNS.
stream of electrons, and an oppositely disposed
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