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Патент USA US2405915

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Filed Dec. 15, _ 1943
{y 71137‘ Quarries/a‘
Patented Aug. 13, i946
John S. Vansant, Huntingdon Valley, Pa., as
signor, by mesne assignments, to Philco Cor
poration, Philadelphia, Pa., a corporation of
' Pennsylvania
Application‘ December 15, 1943, Serial No. 514,409
7 Claims. (Cl. v.2_5o_2'1.5)
This invention relates to electron tubes, and
more particularly those of the type having close
enters thesmaller‘portion of the anode which
is then positioned with its enlarged portion
ly spaced electrodes.
around and accurately spaced a predetermined
For example, in two-electrode tubes in which the
electrodes have commonly taken the form of
to the metal casing or’ envelope ID.
distance from the cathode.v While so held, the
In prior electron tubes, difficulties have been
encountered in establishing and maintaining the vi anode is sealed in position by fusing the glass at
the neck of the cap 24 to the conductor 22', the
required exact close spacing ‘of the electrodes.
spaced parallel discs, this di?iculty has been
encountered. The spacing of such electrodes
would vary materially when the elements were
heated and on occasions caused short circuiting,
particularly if the electrodes became heated be
periphery of the cap having previously been scaled
The mandrel may‘ now be withdrawn and a
?lament or heater element 30 (Fig. 2) of con
ventional structure may be inserted within the
cathode. _ The heater element 30 may be con
ventionally supported ‘on conductors extending
through a glassrpress 32 mounted in a glass cap
It is an object of the present invention to pro~ 15 34 for seal-ing the end of the envelope or casing
H3: opposite the anode. J I
vide an improved electron tube‘ structure, adapt
The tube maybe evacuated in conventional
ed to be readily manufactured in volume with
yond their normal. operating temperatures.
accurately‘ spaced electrodes.
Another object is to provide an improved tube
structure in which heating will have‘ little or in- '
signi?cant effect on the spacing of the electrodes.
Another object is to provide a tube incorpo
rating the foregoing novel characteristics which
may be ?tted directly into the end of a two-con
ductor concentric or coaxial cable.
Another object is to provide a simpli?ed and
economical method of manufacturing a tube of
the foregoing type.
Other objects and advantages of the invention
will become apparent as it is described in con
nection with the accompanying drawing.
In the drawing—
Fig. 1 is a longitudinal sectional view of an
electron tube of the diode-type, embodying the
invention, shown in the process of manufacture;
fashion, as for. example by means of the exhaust
There is tip
36.provided. aV diode-type
tube structure having concentric electrodes which
are accurately positioned and secured. The
structure of the electrodes lends itself to the
simple manufacturing method described, en
, abling large scale production because compli
cated arrangements for obtaining and maintain
ing the exact spacing of the electrodes are
Because of the concentric cylindrical struc
ture of the electrodes, any expansion thereof is
effectively con?ned to a longitudinal direction
and does not affect the electrode spacing. In the
event, however, that any expansion takes place
radially, the electrodes will expand simultane
ously and their spacing will be maintained.
Under certain conditions, it is desirable to use
a diode-tube with a concentric hollow cable or
Fig. 2 is a similar view of the completed tube.
conductor. In such a case, the diameter of the
Referring to the drawing, a cylindrical metal
member Ill may be such as to ?t within
tubular member It having a ?ange l2 at one
end is held ?xedly during manufacture. A me 40 the end of the outer conductor of the cable (not
shown) and the anode conductor 22 may abut
tallic holder 14 of any convenient form, such as
or connect with the internal cable conductor.
a disc, spider or diametric-bar form, is located
The circuit to the cathode will be from the cas
and secured within the member l0 and supports
ing l0 through the cathode support or holder I4
a hollow cylindrical or tubular cathode l8 whose
to the cathode 18.
end I6 is sprayed with a cathode spray of known
In some conditions, the mandrel may be in
composition. The cathode is substantially co
two parts; and the end or inner part which po
axial with the envelope or casing member I0.
sitions the electrodes may remain in position after
An anode comprising a cylindrical tubular
member 26, slightly enlarged at its innermost
the tube is completed.
For simplicity, a tube of the two-electrode or
end, is securely mounted at its other end on a 50
diode type has been illustrated, but it is to be
short rod-like conductor 22 extending through a
understood that the invention is applicable to
glass cap 24 closing one end of the member 10.
other types of tubes.
To locate the anode, a cylindrical mandrel
Modi?cations within the scope of the inven
26 (Fig. 1) which may be formed of insulating
material, is inserted through the cathode l6 and 55 tion will occur to those skilled in the art. There
fore the invention is not limited to the speci?c
embodiment shown and described.
I claim:
acterized in that all overlapping points of the
?ared portion of the second electrode are sub
stantially equi-distant from the overlapped end
1. In an electron tube, an envelope comprising
a tubular conductive member and end closures
therefor composed of non-conductive material, a
hollow cathode electrode within’ said envelope
in substantially coaxial relation to the tubular I
conductive member, conductive means connect
portion of the cathode.
5. An electron tube comprising a container
having a cylindrical metallic portion and a non
conductive portion, a tubular cathode supported
by and connected conductively to said metallic
portion, a conductor extending through said non
ing said electrode to said member, a. conductive 10 conductive portion, a second tubular electrode
element extending through one of the end clo
supported on said conductor and having an en
sures of the tube envelope, and a second hollow
larged tubular portion telescoping with a portion
electrode attached to and supported by said ele
of said cathode and spaced a predetermined dis
ment, said second hollow electrode being longi
tudinally adjacent to and in substantial co-axial
alignment with said ?rst hollow electrode and
having a portion closely encircling a portion of
said ?rst electrode.
tance therefrom, said conductor, said tubular
cathodaand said second tubular electrode all lee
ing longitudinally displaced and in substantial
co-axial alignment with each other and with the
cylindrical metallic portion of the container.
_. .
2. In an electron tube, a tubular electrode sup
6. In an electron tube, an envelope which in
cludes a cylindrical portion and two end portions,
a tubular electrode, means for fastening said
tubular electrode to the inner wall of the cylin
drical portion of the envelope in predetermined
co-axial position, a conductor extending through
one of the end portions of the envelope and se
cured thereto, a sécond tubular electrode secured
to and supported by said conductor and posi
ported within the tube, a second tubular electrode
having a portion axially adjacent to said ?rst
electrode and of substantially the same internal
diameter, said second electrode having another
portion of larger diameter surrounding a part of
said ?rst’ electrode, and means for supporting said
second electrode.
3. ‘An electron tube comprising a container
having a cylindrical metallic portion'and a non
tioned longitudinally adjacent to said ?rst elec
conductive portion, a cylindrical cathode sup
ported by said metallic portion, a, conductor ex
tending through said non-conductive portion, a
trode in co-axial alignment therewith, said sec
ond electrode having a ?ared portion which over
laps the end of the ?rst electrode and is substan
second cylindrical electrode supported onsaid
tially equi-distant therefrom at all overlapping
conductor, said second electrode having a ?ared
end, portion, said cylindrical cathode, said con
ductonand said second cylindrical electrode be
ing longitudinally displaced and'in substantial
co-axial alignment with ‘each other and with the
cylindrical‘ metal portion of the container, said
?ared end portion of the second'electrodeover
lapping the end of said cathode, '
4.‘ An electron tube as defined in claim 3,1char
7. An electron tube as de?ned in claim 6, char
35 acterizedin that the cylindrical portion of the
envelope is of conductive material, the end por
tions are of non-conductive material, and the
means for fastening the ?rst-named tubular elec
trode to the inner wall of the envelope is a con
ductive means.
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