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Патент USA US2410349

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Oct. 29, 1946.
E. LABIN
- 2,410,349
VACUUM TUBE
'Filed DeC._ 15, 1942
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Patented Oct. 29, i946
2,41' . ,349
UNITED. sfrA'rlëzsk - PATENT orificeg
2,410,349
_
VACUUM TUBE '
Emile Labin, New York, N. Y., assignor` to Fed
eral Telephone and Radio Corporation, New
ark, N. J., a corporation of Delaware`
Application December 15, 1942, Serial No. 469,0_55'
16 Claims.
(Cl. Z50-27.5) ,
2y
.
_
This invention relates to improvements in
vacuumv tubes, and more particularly to vacuum
tubes of the cavity type, adapted for use at high
Two equally dimensioned circular metal plates
An object of this invention is to provide a
novelv improved design for a cavity tube.
Another object of this invention is to provide a
the necessary strength to withstand atmospheric
pressurewhen the resonator is evacuated. The
high frequency cavity tube, capable >of handling
locus of voltage minimum points,- which can` be
I0 and I2 are spaced apart parallel to one an
other- by suitable means` such as quartz spacing
frequencies.
insulators I4, which also provide the cavity with
insulators I4‘are- preferably. located along the
high power thermionic emission currents.
Still another object of this invention is 'to pro
Vide a high frequency cavity tube, having large
previously determined. Inthe form of invention
illustrated, the upperplate I0 is .providedlwith a
thin ring-shaped metall member I6, , attached
heatndissipating surfaces integral'with the elec
trode elements.
A further object of this invention is to provide
a Vacuum tube in which the electrodes are
formed as integral extensions about the periph
y
to the ‘plate and having its outer periphery ex
tending ysubstantially labout ¿ the *outerA periphery
of the plate. The lovverplatevIZl is provided with
an upstan'ding ringk I8, rigidlyattached thereto
with'its outer periphery at about the periphery
ery of a resonant cavity, and cooperate with
of theV lower- plate; A suitable annular grid
other walls of the cavity in constituting the
structure 2B Vis attached to the upper edge of the
perimeter.
ring, I8, so that it is radially spaced from theI pe»
In general, the invention relates to a cavity 20 ripheryfof the ring I6,y by a‘desired amount. The
tube in which the tube electrodes are built about
plates lil and- I2 andtheinner surfacev of the
the cavity resonator, in contrast'to usual types
ringsrlß and I8 form the resonant cavity for the
of cavity tubes in which the resonator is built
vacuum'tube. About the A.grid 20 is Apositioneda
about the tube electrodes.
ringeshaped cathode 22, which may be indirectly
Other objects and advantages of the present.
heated as by heater coils~24.- The cathode 22 is
invention will appear from the following descrip
provided with a radial extension 26 whichY maybe
tion of a preferred embodiment and a modifica
tion of my novel tube, illustrated in the accom- `
panying drawing, in which:
’
supportedby' the spacers I4 for positioning'the
cathoderelatively'to.the grid.A A-thin disk 28,
open at Vits'- center is also positioned about the
Fig. 1 is a vertical cross-sectional View of a 30 'grid 20. and is spaced a short distance from the
preferred form of tube construction; and
r'adialiextension 26 on the cathode, the extension
Fig. 2 is a partial cross-sectional View illus
26‘and the disk 28' forming between thema ca.
Atrating a modified structural detail.
pacitative'coupling. The electrodes `and theV res
While various'forms of cavity tubes have been
onant vcavity may bev enclosed by a- suitable glass
heretofore proposed, all of such known tubes are 35
'seal
3l),` connected at one end to theangular knife
so designed that the resonator structure is built
-edge 32, attached'to‘the top'of the plate I0, and
about the tube elements; in other Words, the idea
on the other hand to the annular knife edge. 34
has been t0 start with a vacuum tube and add the
attached
to the'bottomÍ of the plate I2. The disk
necessary resonator structure to it. This con
ception of building a cavity tube has resulted in 40 28 'is >preferably of ‘such diameter that it exteëi‘lds
e
'through the seal 30, outside of the tube.
structural limitations, both with respect to the
heating coil supporting leads 35 will also extend
tube elements and with respect to the resonator
through seal 30 at 3l. On- the bottom of-the
structure, which seriously interferes with the ap
plate I2"is provided an annular 'rim> 36, while
plication of such types of tubes to ultra~high fre
quency work. The present invention is a radical 45 the under side of the disk 28 outside of the tube
periphery is also provided wítha depending an
departure from previously proposed construc
nular rim 38. An open toroid ¿wis setto slidably
tions in that I have made the resonant cavity the
engage the depending portions of the rims 36 and
central part of the tube and have built the tube
elements about the cavity. This arrangement
38. The toroid tilithus _forms aivsecond external
provides greater freedom and choice in design 50 cavity coupling` ythe grid 2U, through"A the lower
and permits the use of the optimum thermionic
and electronic relationships~
In Fig. 1 of the attached drawing, there is il
plate I2, _to the cathode 24 through the disk 28
capacitatively coupled with the radial extension
26. By slidingthe toroid 43 on the depending
lustrated an example of a type of cavity tube
rims, the size of the .external resonant cavity can
formed in accordance with the present invention, 55 be Varied as desired- YCoupling to the second res
2,410,349
3
ample and not as a limitation on the scope of my
invention as set forth in the objects and the ac.d
companying claims.
What I claim is:
1. A cavity resonator electron tube including a‘
diaphragm __42. A cover 44 over the diaphragm
will support a threaded rod 46 connected to the
center of the ilexible diaphragm, thus varying
the size of the internal resonant cavity.
pair of spaced-apart metal plates, each point on'.
one plate being at substantially the same distance:
from the corresponding point on the other plate,l
_
“as measured along a line normal to the surfacet
An adjustable coupling to the internal resonan
at; these points, an anode electrode electrically'
connected to and positioned about the periphery'
cavity may be provided by the rod 48, extending
into the same through a suitable opening in the` ,
' of one of said plates, a second electrode connected
upper plate IIl. For this purpose, the. upper sur->
face of the plate I Il may> be provided with a
.to and positioned about the periphery of the other
plate and spaced from the anode, said electrodes
threaded bushing 50, positioned about the open- '
and said plates forming the perimeter of a cavity
resonator, and sealing means enclosing said elec
trodes, closing the space between the two plates.
2. The combination according to claim l, in
ing, the bushing supporting in 'turn a" threaded L
collar 52. The collar 52 slides in an annular
groove formed in the extension 53 of a ilexible
bellows 56, positioned about the opening. A glass
which said second electrode is a grid, in combina- e
seal 54 is connected about a knife edge on the
extension 5,3 and supports the rod 48. It will be
obvious that rotation of the collar 52 of the bush
ing 50 moves the rod 48 in and out of the cavity,
to a limited extent, while the flexible bellows 56
maintains an air-tight fit. The upper surface of
the plate III may also be provided with an up
standing ring 578 supporting a metal cylinder 60,
which may serve as a plate line. ’
A second arrangementwhich is in most respects
similar to that illustrated Ain Fig.'l is ‘shown'in
30
Fig. .2. In this‘case, however, the electrode sur
trode electrically connected to and positioned
grid electrode connected to and positioned about
the peripheral edge of the other plate and spaced
from the anode, said plates and said electrodes
of at right angles thereto.l The ring IIB depend
ing from within the plate III isv provided with a
radialjrim, serving as the active anode surface,
forming the perimeter of a cavity resonator,- a
cathode electrode positioned on that side of the
grid opposite the anode, and sealing means
whileja grid I20~is supported at the upper end of
the ring I I 8, so that it is parallel to the radial rim
of the; anode. The cathode 122 maybe con
structed similarly as in Fig. l, but in this -case it '
40
may be supplied with the usual heating coil |24
and also has a radialextension I'26 spaced from
and’ parallel to the radial disk I 28. The heater
coils I24_ may be Supported from the spacers I4
bysuitableheater leads I35.
tion with a cathode electrode positioned exteriorly
of and on that side of the grid opposite the anode.
3. The combination'according to claim 1, in
which said plates are ñat parallel plates and said
electrodes are formed as oppositely inwardly di
rected rings extended about the peripheral edges
of said plates.
4. A cavity resonator electron tube including,
a pair of spaced-apart ñat parallel plates forming
part of the perimeter of the tube, an anode elec
about the peripheral edge of one of said plates, a
facesîare mounted parallel to the plates instead .
will be positioned below the grid I2Il.- The cathode
4
paratus, is therefore, made only by way of ex
onant cavity can be effected in any well-known
manner, if desired.
In order that the main resonant cavity may be
tuned, the lower plate I2 may be provided with
a centrally disposed opening covered by a flexible
.
While Iv have illustrated by way of example,
only one modification of the cavity tube structure
illustrated in Fig. 1, it is contemplated that in
the broad‘aspects of the present invention many
modifications will occur to those skilled in this
art.` For example, while the plates I0 and I2 have
been illustrated as Vsubstantially circular, and
enclosing said electrodes between the plates.
5. The combination according to claim 4, in
which said plates are circular and said anode and
grid electrodes are formed as rings inwardly
directed toward one another.
6. A cavity resonator electron tube comprising,
‘a pair of ñat circular metal plates, insulating
Aspacing means between said plates positioning
them parallel with one another, a thin metal ring
connected to the periphery of one of said plates
forming .anode electrode, a second thin metal
ring connected to the periphery of the other
plate, an annular grid supported by the second
ring in spaced relationship with the ñrst ring,
said plates and said rings deiining the perimeter
while `such a coniiguration, having no sharp cor
of a cavity resonator, an annular cathode mount
ners is generally to be preferred, the invention is
ed at the side of the grid opposite the anode, and
55
applicable for use in connection with plates of
sealing means enclosing said electrodes and con
any desired shape. While the plates have been
nected to the two plates.
shown as ilat, they also could be curved, provided
7. The combination according to claim 6, in
that in any event each point on one plate is at
which said cathode has an outwardly directed
the same distance from the corresponding point
radial extension, in combination with a thin
on the other plate as measured along a line nor 60 vmetal ring having a lateral face parallel to and
mal to the surface vat these points. While the tube
has been illustrated as of the triode type, it is also
spaced from said extension, said ring extending
through and supported by said sealing means,
and forming a »terminal capacitatively coupled
contemplated that one 'of the depending rims
forming the outer peripheryof the resonant cav 65
with said cathode.
ity could be used as a cathode electrode, in which
Vcase 'the tube could-be a diode. The principles
‘of the invention are, therefore, equally applicable
‘ to_- diodes as well as triodes. Other modifications,
particularly rin details of construction, _will be
fairlyobvious to those skilled in the art and it is
contemplated that such modifications form part
, of the present invention provided that in all cases,
the.principle of constructing the vacuum'tube
elementsv about the periphery of'a cavity'resonaf
tor is retained. The description ci speciñc ap
- ` 8;'The combination according to claim 6, in
>which said cathode has an outwardly directed
radial extension, in combination with a thin
metal ring having a lateral face parallel to and
spaced from said extension, said ring extending
through and supported by said sealing means,
and forming a terminal capacitatively coupled
, with said cathode, and means outside of said cav
» ity resonator and outside of said sealing means,
forming a second cavity resonator between the
2,410,849
5
grid-supporting plate and said parallel metal
ring.
9. The combination according to claim 6, in
which said cathode has an outwardly directed
radial extension, in combination with a thin
metal ring having a lateral face parallel to and
diate and substantially parallel to the two plates,
in whîchsaid second metal ring is inwardly di
rected toward the other plate, and in which said
grid is connected to the outer end of said sec
ond ring and extends radially parallel to the ra
dial extension on the ñrst ring.
spaced from said extension, Said ring extending
14. A cavity resonator tube comprising in com
through and supported by said sealing means, and
bination, a pair of ñat circular metal plates, in
forming a terminal capacitatively coupled with
sulating spacing means between said plates po
said cathode, a rim depending from said parallel 10 sitioning them parallel with one another, a thin
ring outside of said sealing means, a second rim
metal ring connected about the periphery of one
depending from the outer surface of the grid
of said plates, inwardly directed toward the other
supporting plate in the same direction as the iirst
plate and provided at its outer end with an out
rim, and a toroid having an open lateral face
ward radial extension intermediate and substan
engaging the two dependent rims, and forming 15 tially parallel to the two plates to form an anode
with them a second and external cavity reso
electrode, a second thin metal ring connected
nator coupling the grid to the cathode through
about the periphery of the other plate, inwardly
said capacitating coupling.
directed toward the iirst plate, said plates
10. The combination according to claim 6, in
and said rings deñning the perimeters of a cavity
which the grid-supporting plate has a substan 20 resonator, a grid connecting to the other end of
tially central hollow opening, in combination
with a flexible diaphragm covering this opening
and sealed at its edges to the plate, means op
eratively connected with said diaphragm for
moving it to tune the resonator, and resonator
coupling means supported by and extending
through the other plate.
'
11. The combination according to claim 6, in
said second ring and extending radially, parallel
to the radial extension on the first ring, an an
nular cathode mounted about the side of the
ring opposite the anode, said cathode being
25 formed with an outwardly directed radial exten
sion, sealing means enclosing said electrodes and
connected between the two plates, a thin metal
ring having a lateral face parallel to and spaced
from said extension, said last ring extending
which said cathode has an outwardly directed
radial extension, in combination with a thin met 30 through and supported by said sealing means to
al ring having a lateral face parallel to and
form a terminal capacitatively coupled with said
spaced from said extension, said ring extending
cathode, and means outside of said cavity reso
through and supported by said sealing means
nator and outside of said sealing means forming
forming terminal capacitatively coupled with said
a second cavity resonator between the grid-sup
cathode, a rim depending from said parallel ring 35 porting plate and said parallel metal ring.
outside of said sealing means, a second rim de
15. The combination according to claim 14, in
pending from the outer surface of the grid-sup
which said second cavity resonator forming
porting plate in the same direction as the ñrst
means comprising a rim depending from said
rim, and a toroid having an open lateral face ad
parallel rim outside of said sealing means, a sec
justably, slidably, engaging the two depending 40 ond rim depending from the outer surface of the
rims, and forming with them a second and eX
grid supporting plate in the same direction as
ternal cavity resonator coupling the grid to the
the firstK rim, and a toroid having an open lateral
cathode through said capacitative coupling.
face engaging the two depending rims.
12. The combination according to claim 6, in
16. A cavity resonator electron tube including,
which said rings are both mounted at right an
a pair of spaced-apart metal plates, a pair of
gles, to and between the metal plates, in which
spaced electrodes respectively mounted on and
said grid surrounds the ñrst metal ring, and in
about the outer periphery of said plates to form
which said cathode surrounds the grid.
with said plates the perimeter of a cavity reso
13. The combination according to claim 6, in
nator, and sealing means connected between said
which the ñrst metal ring is inwardly directed t0
ward the other plate and is provided at its outer
end with an outward radial extension interme
‘ plates and enclosing said electrodes.
EMILE LABIN.
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