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Патент USA US2408240

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Sept. 24, 1946.
‘P. |_. SPENCER
28,408,239
ELECTRONIC DISCHARGE DEVICE
Filred July 14, 1945
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Patented Sept. 24, 1946
UNITED STATES PATENT OFFICE
2,408,239
ELECTRONIC DISCHARGE DEVICE
Percy L. Spencer, West Newton, Mass., assignor to
Raytheon Manufacturing Company, Newton,
Mass, a corporation of Delaware
Application July 14, 1943, Serial No. 494,685
5 Claims. (Cl. 250-—2'7.5)
1
This invention relates to an electronic discharge
device of the magnetron type, and more particu
larly to the lead-in conductors providing the elec
trical connections and supports for the cathode
and heater elements of such devices.
In devices of the type to which the invention
relates, the cathode and its heater form a uni
tary structure which must be accurately posi
tioned with respect to a plurality of anode faces.
Inasmuch as it is desired to provide a magnetic 10
2
The cathode structure 1 includes a conducting
sleeve 8 coated exteriorly with an electron emis
sive substance. Insulating end plugs 9 and Ill
are provided for closing the ends of the hollow
conducting sleeve 8, and conducting pins 12 and
I3 extend through and are supported centrally
in each of the plugs 9 and ID. A heater I4 is
provided on the interior of the hollow sleeve 8
and is connected at each end to the conducting
pins 12 and i3.
Conducting strips l5 provide
an electrical connection between the conducting
pin I2 and the sleeve 8 and also serve to retain
insulating plug 9 Within the end of said sleeve.
and the cooperating anode faces, it is necessary
Retaining strips it serve to retain the insulating
that the lead-in connections for the cathode
heater structure be disposed laterally of the tube 15 plug in in the lower portion of the hollow sleeve
8, but these strips are not electrically connected
so as not to interfere with the means for impos
to the pin l3. Magnetic poles l1 and 18 are
ing such magnetic ?eld. Since the lead-in con
provided closely adjacent the end caps 3 and 4
ductors also support the cathode-heater struc
for imposing a magnetic field extending paral
ture any vibration of the rods forming the con
ductors results in a corresponding vibration of 20 lel to the adjacent anode and cathode faces, and
transversely to the direction of the electron flow
the cathode-heater structure relative to the an
therebetween. Openings l9 and 23 are provided
ode faces. Such vibration of the cathode-heater
in the lateral wall of the hollow cylinder 2 at
structure relative to the anode faces results in
points above and below the radial plates 3. A
irregularities in the operation of the device and
is particularly objectionable Where the device is 25 pair of conducting pipes 2| and 22 is provided
with reduced end portions 23 and 24, which re
used on an airplane, vehicle, or other place where
duced end portions are threaded to screw into the
the device is subject to vibration.
openings [9 and 20 and are hermetically sealed
It is a primary object of the present invention
therewith. Openings 25 and 2% through the re
to provide a lead-in structure for the cathode and
heater elements which will support these elements 30 duced end portions 23 and 24 permit cathode and
heater lead-in conductors 21 and 28 to pass there
with sui?cient rigidity to prevent vibration ‘there
through with sufficient clearance to avoid elec
of without introducing additional elements that
trical contact with the conducting pipes 2| and
would complicate the structure or alter the char
22. Glass seals 29 and 30 are mounted on the
acteristics of the tube.
The above and other objects and features of 35 outer ends of the conducting pipes 21 and 22
and hermetically sealed therewith. The seals
the invention will be made fully apparent to
29 and 33 comprise outer tubular portions 3! and
those skilled in the art from a consideration of
32 'of substantially the same diameter as the
the following detailed description taken in con
outer ends of conducting pipes 2| and 22. The
junction with the accompanying drawing in which
the single ?gure represents a longitudinal sec 40 tubular portions 3| and 32 are of substantial
length in order to provide insulation between the
tional view of a magnetron provided with the im
conducting tubes 2| and 22 and the outer ends
proved lead-in connections constructed in ac
of the conductors 21 and 23. Reentrant stems
cordance with the present invention.
33 and 34, extending back through the tubular
Referring to the drawing, reference numeral l
indicates an hermetically sealed envelope formed 45 portions 3| and 32, terminate in elongated beads
35 and 36 in which are sealed the conducting
of a hollow cylinder of non-magnetic conductive
rods 21 and 28. The length of the reentrant
material, such as copper. The hollow cylinder
stems 33 and 34, together with the elongated
2 is closed at each end by end caps 3 and 4 which
beads 35 and 36, is such that the beads 35 and
are likewise of copper and which are hermeti
cally sealed as by soldering, or otherwise, to the 50 36 project into or are adjacent to the outer-ends
of the conducting pipes 2| and 22.
ends of the cylinder 2. The interior Wall of the
In manufacture, exhaust tubulations are pro
hollow cylinder 2 has an annular projection 5
vided adjacent the outer ends of the seals 29 and
extending inwardly from the surface thereof, and
30 and after the tube has been exhausted these
a plurality of plates 6 extend radially and from
the annular projection 5 to provide a plurality 55 are sealed oil as indicated at 31 and 38. By pro
viding the exhaust seals 31 and 38 toward the
of anode faces adjacent a cathode structure 1.
?eld having its lines of force directed longitudi
nally of the combined cathode-heater structure
2,408,239
3
4
outer ends of the tubular portions 3! and 32 at
points remote from the beads 35 and 36, injury
ducting tubes and out of contact therewith, glass
seals for said lead-in conductors at the outer ends
of said conducting tubes, said seals having tubu
lar portions projecting outwardly from said con
ducting tubes, and reentrant stems projecting
back into the outer ends of said conducting tubes
for supporting said conducting rods therein.
to the seals formed by these beads with the con
ductors 2'! and 28, due to the heating thereof in
the process of sealing off the exhaust tubulation
at 31 and 38, is avoided. Also, in the normal op
eration of the tube, the seals formed by beads 35
and 36 are kept cool by proximity to the copper
conducting tubes 2| and 22 if the beads are ad
jacent the tubes, thereby avoiding injury to the
a. An electrical discharge device comprising an
envelope of conductive material, a combined
cathode-heater structure positioned centrally
seals due to excessive heating thereof in normal
within said envelope and extending longitudi
nally thereof, a plurality of plates of conductive
material projecting inwardly from a portion of
said envelope intermediate the ends thereof, said
plates providing a plurality of anode faces adja—
cent said cathode-heater structure, said envelope
operation. Furthermore, by providing relatively
long reentrant stems 33 and 34 so that the elon
gated beads 35 and 36 project into the outer ends
of the conducting pipes 2| and 22 the vibration
of the rods 21 and 28 is reduced to such a degree
that it becomes negligible and no longer aifects
the operation of the tube.
providing end spaces at each end thereof beyond
the ends of said plates, said cathode-heater struc
ture comprising an outer conducting sleeve pro
While I have herein described a preferred em
bodiment of the invention, other embodiments
within the scope of the appended claims will be
apparent to those skilled in the art from a con~
sideration of the form shown.
What is claimed is:
1. An electron discharge device comprising an -'i
envelope, a cathode-heater structure, a pair of
lead-in conductors connected to opposite ends of
said cathode~heater structure, providing sup~
ports therefor and extending transversely thereof, a pair of conducting tubes projecting exter~
nally of said envelope, said lea-d in conductors
extending through said conducting tubes and out
of contact therewith, glass seals for closing the
outer ends of said conducting tubes, said seals
having tubular portions projecting outwardly
from said conducting tubes, and reentrant stems
projecting back into the outer ends of said con
conducting
ducting tubes
rodsfor
therein.
sealing and supporting
2. An electron discharge device comprisingr an
envelope, a cathode-heater structure, a pair of
lead-in conductors connected to opposite ends
of said cathode-heater structure, providing sup
ports therefor and extending transversely there
of, a pair of conducting tubes projecting exter
nally of said envelope, said lead-in conductors ex
tending through said conducting tubes and out of
contact therewith, glass seals for closing the
outer ends of said conducting tubes, said seals
having outer tubular portions and reentrant
stems extending through said outer tubular por
tions to points adjacent said conducting tubes
and terminating in elongated beads for sealing
and centering said conducting rods therein.
3. An electrical discharge device comprising an
envelope of conductive material, a combined
cathode-heater structure positioned centrally
within said envelope and extending longitudinally
thereof, a plurality of plates of conductive mate
viding an active surface coacting with said an
ode faces, and a heater within said sleeve, apair
of conductive members, one at each end of said
cathode-heater structure and each projecting into
one of said end spaces, one of said conducting
members being electrically connected to both said
sleeve and said heater, the other of said conduct
ing members being electrically connected to said
heater and insulated from said sleeve, a pair of
lead-in conductors, each connected to one of said
30 conducting members and each extending trans~
versely to the axis of said cathode-heater struc
ture, one in each of said end spaces, a pair of
conducting tubes sealed in said envelope and pro
jecting externally thereof, said lead-in conduc
tors extending through said conducting tubes and
out of contact therewith, glass seals for said lead
in conductors at the outer ends of said conduct
ing tubes, said seals having tubular portions pro
jecting outwardly from said conducting tubes,
and reentrant stems projecting back into the
outer ends of said conducting tubes for support
ing said conducting rods therein.
5. An electrical discharge device comprising an
envelope of conductive material, a combined
"' cathode-heater
structure
positioned
centrally
within said envelope and extending longitudinally
thereof, a plurality of plates of conductive mate
rial projecting inwardly from a portion of said
envelope intermediate the ends thereof, said
plates providing a plurality of anode faces adja
cent said cathode-heater structure, said envelope
providing end spaces at each end thereof beyond
the ends of said plates, said cathode-heater
structure comprising an outer conducting sleeve
providing an active surface coacting with said
anode faces, and a heater within said sleeve, a
pair of lead-in conductors one at each end of said
cathode-heater structure and each extending
radially therefrom through one of said end spaces,
rial projecting inwardly from a portion of said 60 one of said lead-in conductors being electrically
envelope intermediate the ends thereof, said
connected to both said sleeve and said heater, the
plates providing a plurality of anode faces adja
other of said lead-in conductors being electrically
cent said cathode-heater structure, said envelope
connected to said heater and insulated from said
providing end spaces at each end thereof beyond
sleeve, a pair of conducting tubes sealed in said
the ends of said plates, said cathode-heater
envelope and projecting externally thereof, said
structure comprising an outer conducting sleeve
lead-in conductors extending through said con
providing an active surface coacting with said
ducting tubes and out of contact therewith, glass
anode faces, and a heater within said sleeve, a
seals for said lead~in conductors at the outer ends
pair of lead-in conductors, each connected to one
of said conducting tubes, said seals having tubu
end of said cathode-heater structure and each 70 lar portions projecting outwardly from said con
extending transversely to the axis of said cath
ducting tubes, and reentrant stems projecting
ode-heater structure, one in each of said end
back into the outer ends of said conducting tubes
spaces, a pair of conducting tubes sealed in said
and terminating in elongated beads for support
envelope and projecting externally thereof, said
ing said conducting rods therein.
lead-in conductors extending through said con
PERCY L. SPENCER.
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