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Патент USA US2130380

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2,130,380
Patented Sept. 20, 1938
UNITED STATES PATENT OFFICE
2,130,380
A
ELECTRON DISCHARGE DEVICE
Richard U. Clark, Wilmette, Ill.
Application April 23, 1937, Serial No. 138,496
7 Claims. (Cl. Z50-27.5)
The present invention relates to electron dis
charge devices and more particularly to a novel
construction of vapor electric tube primarily
adapted for the generation or by-passing of ap
5 preciable amounts of electric current of either
an alternating or pulsating nature, when prop
erly excited by direct or alternating current from
any suitable external source, as shown in my co
pending application, issued on June 22,.-l,_as_
10
Patent No. 2,084,478.
.
玪
' -
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One of the objects of the present invention is
to provide a novel construction ofrvapor electric
tube employing a readily ionizable atmosphere,
in combination with a common electron emitting
15 means, a plurality of associated -grids and an
odes and means for permitting a free but con
trolled flow of electrons from substantially the
entire surface of the emitting means.
Another object of -the present invention is to
20 provide in a vapor electric tube having multiple
grid and anode elements, a common cathode or
electron emitting means so constructed and ar
ranged as to permit a free and complete flow
-of electrons from substantially its entire emit
25 ting surface to one plate at' a time.
A further object of my invention is to provide
a method of transferring energy in a vapor elec
tric tube having a plurality of grids and cooper
ating plates and common electron emitting
30 means, by directing and controlling the emission
from substantially the entire surface of the com
plates or anodes II and I2 connected to lead wires
I3 and I4, respectively. The grld heat radiators
?I and 8 are employed to maintain the grids cool
and to reduce the grid emission.
There is provided a non-conducting partition 5
I5 having an outer diameter greater than that
of the plates. This partition has a central open
ing which forms a close iit or contact with the
, outer surface of the common cathode.
l
. In the form shown the partition is providedy l0
with a metal core I6 positioned between layers
Il of suitable non-conducting material. 4This
core is preferably biased through the connection
I8 for the purpose ofrelieving it from a charge
that may be built up therein.
`
`
15
The grids 5 and 6 aswell as plates or anodes
II and I2 abut against this non-conducting par
tition which acts as a screen or baffle to prevent
stray arcs between the adjacent tube sections.
It also serves to center and anchor the multiple zo
grids and plates.
The common cathode- or electron> emitting
means may be ofthe oxide coated type, of caesi
ated metal, or of any other'type suitable for use
with alkali metal vapors. In the disclosed em- 25
bodiment it comprisesv a tube-like sleeve I9 ex
' tending through the partition enclosing a heating
coil 20. This sleeve is provided on each side of
mon electron emitting means to one plate at a
the partition with a plurality ofA openings 2l.
By this'arrangement the free flow of electrons 30
from substantially the entire surface of the cath
ode or electron emitting means is permitted to
time.
tion notwithstanding the partition tightly lits
The above features, advantages and capabilities
35 of my present invention will become apparent
from a description of the accompanying draw
ing in which I have illustrated one form of my
invention but the form there shown is to be un
derstood as illustrative only and not as defining
40 the limits of my invention except as expressed
or intended to be expressed in the appended
claims.
Fig. 1 is a view partially in section of an elec
tron discharge device illustrating an embodiment
45 of my invention.
Referring to the drawing in detail there?is dis
closed an evacuated bulb I in which is mounted
a common cathode or electron emitting means
one plate at a time when the tube is in opera
around the cathode at such times as the grids 35
prevent simultaneous emission to the plates. In
other words, stated in simple verbiage, in this
type of tube with the cathode arranged as de
scribed, When in operation it acts as a sort of
valve to direct and control emission from sub- 40
stantially the entire surface of the common elec- '
tron emitting means to one plate at a time thus
greatly increasing the e駃ciency of the tube..
The number of openings in the sleeve I9 and
size thereof may vary. It is important, however, 45
that the displacement of the openings in the ag
gregate be sufficient to by-pass the iiow of elec
trons and ions from one portion of the electron
provided with leads 3 and 4 for supplying heater . emitting means to the other when the tube is in
50 excitation. This common cathode may .be heated operation and at such times as the grids prevent 50
either indirectly or as a filament. Surrounding simultaneous emission to the plates.
The particular form disclosed has been em
or encompassing the electron emitting means are
ployed with very satisfactory results in oscillat
provided multiple grids 5 and 5 having heat ra
diators ?I and 8 connected to lead wires 9 and ing circuits to generate electron current from ap
Surrounding these grids are plied direct current source. This type of tube is 55
55 I0, respectively.
2
2,130,380
particularly important in low voltage oscillating
circuits such as are necessarily employed in op
erating radio sets in automobiles.
In order to?heat the cathode quickly to start
" the tube oscillating in the shortest possible time
I preferably decrease the thickness of the cath
ode wall at and near its midsection since in a
tube of this type a. heater coil tends to more quick
ly heat at its central portion.
Thus by thin
10 ning the central or midsection of the cathode
sleeve, as clearly shown in the drawing, at and
adjacent this central portion of the heater coil,
the cathode reaches an emitting temperature at
that point far more quickly than other portions
thereof. Thus the invention comprehends great
er initial heat at the central portion with the
subsequent uniform heat throughout substan
tially the extent of the cathode. It is, of course,
to be understood that suil頲ient radiation is pro
20 vided adjacent this point that no harmful over
heating of the cathode takes place. 'I'his type
of cathode is most effective when used with a
noble gas filling such as neon, argon, krypton,
xenon, or the like.
25
Having thus disclosed the invention, I claim:
1. In a vapor electric tube having ionizable
atmosphere, a plurality of grids and cooperating
plates, and common electron emitting means en
closed by the grids and plates and provided with
30 suitable openings in its outer surface and so ar
ranged and combined as to direct emission from
substantially its entire emitting surface to one
plate at a time for the purpose set forth.
2. In a vapor electric tube adapted for low volt
of the cathode to the other and for directing and
controlling emission from substantially the en
tire surface of the common cathode to one plate
at a time.
4. In a vapor electric tube for low voltage os
cillating circuits for operating automobile radio
sets, a plurality of grids and cooperating plates.
a non-conducting partition intermediate said
grids, a common cathode passing through and
fitting tightly into said partition, said cathode
being provided with openings for by-passing the
flow of electrons and ions from one portion of
the cathode to the other and for directing and
controlling emission from substantially the en
tire surface of the common cathode to one plate
at a time.
5. In a vapor electric tube, a cathode therefor
comprising a sleeve-like member having its mid
section of less wall thickness than the remainder
to permit more rapid initial heating and emis
sion at that portion with sufilcient heat radiation
from the surfaces of the cathode adjacent the
mid-section to prevent such surfaces from ris
ing to a higher final temperature than other por
tions of the cathode.
6. In a vapor electric tube having ionizable
atmosphere, a plurality of grids and cooperating
plates, a metallic partition intermediate said
grids, a common electron emitting device passing
through and fitting tightly into said partition.
and means for insulating said partition from
the grids and plates, said emitting device being
provided with~ openings in its outer surface so as
to alternately afford when in operation emission
35 age oscillating circuits for operating automobile _ from substantially its entire
radio sets, comprising a plurality of grids and to one plate at a time and to emitting surface
minimize the drop
cooperating plates, an electron emitting device
common to both plates and grids, said emitting
device being provided with openings in its outer
40 surface so as to alternately afford when in 0p
eration emissionv from substantially its entire
emitting surface to one plate at a time and to
minimize the drop in voltage between the plates
and emitting device.
45
3. In a vapor electric tube having ionizable
atmosphere, a plurality of grids and cooperating
plates, a non-conducting partition intermediate
said grids, a common cathode passing through
and fitting tightly into said partition, said cath
50 ode being provided with openings for by-passing
the iiow of electrons and ions from one portion
in voltage between the' plates and emitting de
vice.
7. In a vapor electric tube having ionizable at
mosphere, a plurality of grids and cooperating
plates, an insulating partition intermediate said
grids and provided with a metal core, a common
electron emitting device passing through said
partition and in contact therewith, and open
ingsprovided in said emitting device for by-pass
ing the flow of electrons and ions from one portion 45
of the cathode to the other and for directing and.
controlling emission from substantially the en
tire surface of the common cathode to one plate
at a time.
-
RICHARD U. CLARK.
50
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