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Nov. 26, 1946.
_ 2,411538
Filed June 25, 1941 '
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Patented Nov. 26, 1946
' UNITED STATES einem' oFF?cef'f
› " “Frank, Douglas Goodchíld, London, England, as
signor to International Standard _Electricjco'r- '
r'poration, New i?irk,` N. Y. ›
~_ Application J'une 25,*1941, Serial No. 3995997
In Great Britain June 21, 19510.
1 Claim.
(Cl. aso-27.5)
This invention relates to electron discharge ap
paratus incorporating high frequency resonators
of coaxial-conductor type and to insulating seals
for co-axial conductors.
In co-pending U. S. application Ser. No.
invention for making a seal for bringing a co
axial conductor transmission line out of an evac
uated envelope will now be described with refer
ence to Figs. 1 and 2 of the accompanying draw
In the ?rst ?gure there is shown a length of
co-axial conductor transmission line comprising
British Patent No. 531490, June 24, 1941, various
a Copper tube A and a centre rod B; C is a but
electron discharge devices are disclosed compris
ton of glass and D a stem sealed to the outside of
ing lengths of co-axial conductor line constituting
Very high frequency resonators and means for 10 the tube and adapted to be sealed in known man
ner in a bulb which in the present case surrounds
passing electron beams through the ?elds of the
the tube A. 'The Copper tube A is machined
resonators for the Velocity modulation of the
361401, ?led November 27, 1940, corresponding to
In such arrangements, and generally where co
' down to a wall thickness ,of 0.015" in the region
of the _glass button and is feathered in the well
axial-conductor-type resonators are employed as 15 known manner at the point where the stem is
frequency determining circuits interacting di
rectly with electron streams in electron discharge
apparatus, it is desirable to provide means for
tuning the resonator and a convenient way of
› sealed on the outside.
The method_ of manufacture will be clear from
the second ?gure. A short tube of glass shown
at F is sealed to the inside of the copper_ tube
external heat together with the application of
doing this is to vary the electrical length of the 20 by'
a, paddle to the inside to knead the glass down
conductors, that is, the sp-acing between nodal . on to the Copper wall. A bead of glass is also
points. Obvious difficulties immediately arise if
fused to the centre rod at G. Both?these small
the resonator is wholly contained within an en
pieces of glass are heated simultaneously and
velope. Diñiculties also arise in reducing radia
while still molten the rod is pushed into the tube
tion loss to a ?satisfactorily small value if the 25 so that the two pieces of glass are joined to
co-axial conducto-rs are split into mechanically
separate parts respectively inside and outside the
The rod_ B may be wholly of Copper of uniform ,
envelope, these difficulties arising mainly because
diameter or the part passing through the glass
of the necessity' of a glass or other partiticn be- e
tween the parts.
30 button may be a squirrel cage structure or a
The invention in one aspect thereof resides in
an electron discharge device comprising co-axial
conductors sealed in a, vacuum tight glass enve
Copper sheath as will be clear from the disclo
glass bead on to the inner conductor and insert
ing the inner conductor into the outer conductor
while the glass ring and the glass bead are molten
and B are provided with apertures K in a com
mon diameter and ?ns L in the apertures and
projecting from a part M of the wall which serves
to collect the electrons. A cathode N and_ a
sures in British Patent No. 538,485, August 6,
1941. It is also possible for the rod to be of
and the glass bead of hard glass.
lope, electrodes within the envelope adapted to set
In Fig. 3 of the accornpanying drawing is shown
up an electron beam traversing the ?eld of the 35
a díscharge device utilising the principles of elec
co-axial conductors for the direct interaction of
velocity modulation and incorporating a co
the electrons and the ?eld and means Operating
axial-conductor-type resonator. The device em
upon the part of the co-axial conductors outside
bodies theseal described with reference to Figs.
the envelope for Varying the electrical length of
1 and 2, and shows by way of example how the
said conductors.
concluctors may be brought out from
The invention also resides in a, method of mak
the evacuated envelope and tuned by means ex
ing an insulating sea? between co-axial con
ternal to the envelope.
ductors consisting in fusing a glass ring on to the
Referring to Fig. 3 the co-axial conductors A
inner surface of the outer conductor, fusing a
I so that these glass parts become united.
' A better understanding of this -invention will
fccussing electrode O are required outside the
be had from the particular description thereof 50 tube A opposite the aligned apertures. These
constructiona? features› and the principles of op
made with reference to the accompanying draw
eration for the generation of high frequencies are
ing, in which Figs. 1 and 2 illustrate the method
vfully described inøthe above mentioned_U. S. ap
of making the seal, and .Fig. 3 shows the com
plication Ser. No. 367 ,401.
pleted tube structure.
The preferred method in accordance with the 55 The co-aXial conductors extend through the"
stem E, the sealing arrangeinents being as al
ready described. The frequency of oscillation
tight envelope and having aligned apertures, part
depends upon the length of the conductors be
tween short-circuiting conductive b?ridging mem
of said coaxial conductors being outside said en
velope, electrodes within the envelope in line with
One of these conductive bridging members
is constituted by a plunger or piston H slidable
within the part of the tube A and along the part
of the rod B which projects through the stem E.
Any convenient screw or other adjusting mech
anism may be provided for the
arrangement provides continuous
the Operating frequency with a
Modi?cations within the scope
plunger. The
adjustment of
range of fre
of the inven
tion as well as different applications of the fea
tures claimed will be readily appreciated.
What is claimed is:
conductors' s'ealed substantially within a vacuum
said apertures and adapted to set up an electron
beam traversing the apertures of the co-axíal
conductors for the velocity modulation of the
electrons an annular insulating seal between the
inner conductor and an intermediate portion of
the outer conductor of reduced wall thickness a
coaxial sea] between an end of the outer con
ductor and a glass tube forming part of the en
velope, and adjustable means within the part of
one of the co-axial conductors outside the enve›
15 lope for Varying the electrical length of said con
ductors. ›
Electron discharge device comprising co-axia]
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