close

Вход

Забыли?

вход по аккаунту

?

код для вставки
Ode 3, 1946-
'
H. c. THQMPSON
‘
2,409,165
ELECTRON DISCHARGE DEVICE
Filed Jan. 25, 1945
2 Sheets-Sheet l
"III/Ill
i
- 0.‘?
arrow/5y
H. c. THOMPSON
2,409,165
ELECTRON DISCHARGE DEVICE
Filed Jan. 25, 1945
2 Sheets-Sheet 2
IN VEN TOR.
#91947 A’ 7i/0/77F5’0/7
BY
Patented Oct. 8, 1946
2,409,165
UNITED STATES PATENT OFFICE
2,409,165
ELECTRON DISCHARGE DEVICE
Harry C. Thompson, Princeton, N. J ., assignor to
Radio Corporation of America, a corporation
of Delaware
Application January 25, 1945, Serial No. 574,472
9 Claims.
1
(Cl. 250-462)
.
2
The invention covered herein may be manu
factured and used by or for the Government of
the United States for any governmental purpose
Without payment to me or assigns of any royalty
between which the beam is directed and by which
the beam is de?ected.
In the aperture assembly there are four ele
ments which must be made with a high degree of
thereon.
precision to provide a successful device of the
My invention relates to electron discharge de
kind under consideration, particularly with ref
vices, more particularly to such devices suitable
erence to the maintenance of the dimensions and
for use at ultra high frequencies and utilizing a
alignment effecting these four elements. The
beam of electrons which is periodically de?ected
four elements of the apertured assembly include
for varying the output current of the device.
10 two beam forming apertures, an electron lens, a
Electron discharge devices to which the pres
base for mounting the de?ection plates and a slot
ent invention is directed are used as mixers and
for locating the intercepting wires. A solid uni-
ampli?ers, particularly at high frequencies Where
.tary structure for determining the relationship
the advantages of low input conductance and ca—
between the above four elements is required. In
pacity are important,
15 practice it was found, however, that the aperture
One form of beam de?ection tube includes a
openings varied and that the pressure to which
cathode and associated elements for providing a
directed beam of electrons of rectangular cross
section, which beam is directed toward a collector
through a beam focusing and beam de?ection 20
the elements were subjected caused variations
which could not be tolerated and careful inspec
tion and adjustment were necessary to bring
system, the electron beam being de?ected across
about the required accuracy.
It is. therefore, an object of my invention to
an apertured element to determine the amount of
current to the collector. The aperture may be
provide an electron discharge device of the type
described in which greater accuracy of aperture
bisected by a rod-like element, thus producing in
width and of aperture alignment with cooperat
eiiect a double aperture. Positioned between the 25 ing members can be had by inexpensive and prac
collector and apertured element may be a sup
tical means.
pressor which may be aligned with the aperture
A more speci?c object of my invention is to
in the apertured element.
make a device of the kind described in which the
In the copending application of Charles W.
aperture openings are made dependent upon and
Mueller, Serial No. 561,339, filed November 1, 30 equal to just one readily controllable dimension of
1944, and assigned to the same assignee as the
the structure.
present application, there is shown and described
A further object of my invention is to provide
a beam de?ection tube of the general type de—
such a device in which the aperture openings can
scribed above. This tube utilizes a flat plate type
be located automatically and symmetrically about
of construction for insuring accurate alignment
the mid-plane of the structure.
I
of the various electrodes. ‘In this arrangement
A further object of my‘ invention is to provide
a cathode provides a rectangular shaped beam of
a structure of the kind described which eliminates
electrons directed toward a collector. The beam
the need for di?usion welding.
focusing and de?ecting electrode system com
A further object of my invention is to provide
prises a pair of oppositely disposed plates, each 40 a device in which the number of parts is mini
having a pair of rod-like elements welded to the
mized and in which the processing can be made
inside surface and extending transversely of the
more routine.
beam path. They are oppositely disposed from
A further object of my invention is to provide
each other to provide a pair of successively posi
such a device in which a short radius of curvature
45
tioned apertures. To maintain these plates in
of the aperture edges can be obtained,-thus im
spaced relationship and to de?ne the rectangu
proving aperture action.
lar apertures, separating members extending par
A still further object of my invention is to pro
allel to the beam path and providing supporting
vide a device of the kind described in which
arms are positioned at the top and bottom of the
changes of aperture openings can be made by
plates. Each comprises three superimposed 50 one change in one element of the assembly.
spacer elements, the middle one of which is
A further object of my invention is to provide
shorter than the other two to provide a ‘slot at
such a device in which ?rst and second apertures
a the end of the spacer element adjacent the col
may be made of varying widths, and which can be
lector. These longitudinally extending arms also
less than the spacer thickness separating the
support oppositely disposed de?ecting electrodes 5 apertured plates.
,
2,409,165
3
A still further object of my invention is to pro
vide such a device in which the aperture openings
have the same mid-plane
the spacer and the
whole assembly, whereby the slot for the inter
cepting wire and the deflecting plates subse
quently located and positioned by the assembly
legs are located symmetrically with respect to
said mid-plane.
The novel features which I believe to be char
acteristic of my invention are set forth with par
ticularity in the appended claims, but the inven~
tion itself will best be understood by reference to
the following description taken in connection with
the accompanying drawings in which Figure 1
is a side elevation with parts broken away to show i
details of construction of an electron discharge
device made according to my invention, Figure 2
is a transverse section taken along the line 2——2
of Figure 1 and showing a top view of the elec
trode assembly, Figure 3 is a‘transverse section 20
taken along the line 2—3 of Figure 1, Figure 4
is an exploded perspective of the mount assem~
bly of the tube shown in Figures 1 to 3, inclusive.
Figures 5 and 6 show details of construction of
the aperture plate, Figure 7 shows details or" con
struction of the de?ecting electrode assembly,
Figures 8 and 9 show details of the spacer strip
and Figures 10, 11 and 12 show partial sections
of modi?cations of the aperture plate assembly.
Brie?y, the device made according to my inven- 1
tion is housed within a non-magnetic metallic
envelope provided with leads so that the device
may be plugged into a proper socket or circuit.
It includes a cathode assembly at one end of the
envelope for providing a directed beam of elec
trons and a collector at the other end of the en
velope for receiving the electrons with a beam
focusing and de?ecting electrode assembly posi~
4
by the slot at the ends of the arms 21 and 26 as
shown. Mounted at the end of the assembly is a
pair of shields 32 and 33 which are supported by
the header and are secured to the arms 25 and
21. These shields in turn support the apertured
suppressor electrode 34 having the aperture 34’
by means of the glass bead assemblies such as 35
and 35'. A lead 35" is provided for the sup
pressor. The end of the aperture and deflecting
electrode assembly adjacent the cathode I2 is
provided with a pair of transverse shield mem
bers 48 and ill. These shield members provide a
linear accelerating field for the electron beam
and prevent stray electrons from striking the de
?ecting plates.
Electrons from cathode 12 pass through the
aperture l5’ through the aperture assembly 25 be
tween the deflecting electrodes 28 and 2d and are
deflected across the intercepting wire 30 passing
through the aperture 34' to the collector 2| . The
cathode end of the assembly is supported by the
bracket 38’.
A getter wire or trough 31 is mounted at the
top of the envelope at the ends of the conductors
and leads 38 and 39. A shield 38 is provided be
tween the getter and the top of the electrode as
sembly.
The header is provided with a glass press 42
through which the leads 0,3 and 44 extend, these
being in turn connected to de?ecting electrodes
29 and 28 by means of clips. The leads 43 and M
extend parallel to each other through the press
so that a coaxial line or Lecher wire system may
be conveniently connected to the same externally
of the envelope.
The details of the aperture, lens and de?ecting
electrode assembly are shown in Figures 4 to 6,
inclusive. The aperture assembly comprises a
pair of oppositely disposed U-shaped elements 50
tioned between the cathode assembly and col
and Si having on their inner surfaces spring aper
lector.
ture elements to be described having ribs extend
As shown in Figures 1 to 3, inclusive, the metal
ing transversely of the beam path and toward each
envelope ill of oval shape is provided with a me
other to form apertures. These U-shaped ele
tallic header ll through which the various leads
ments are spaced by means of spacer elements 53
and supports for the electrodes extend, these leads
being insulatingly sealed through the header 45 and 54 at the top and bottom of the assembly
and will be described more in detail below.
member. The envelope and header may be made
of non-magnetic material such as stainless steel.
Mounted within the envelope is a cathode elec
Supported on the arms 25 and El are the de
flecting electrode assemblies 28 and 29 including
a mica element such as 55, reference being had to
trode assembly comprising the indirectly heated
cathode 12 provided with heater-cathode leads 50 Figure 7, including tabs or ear-like extensions
such as 45 and ll? at its ends. A spacer element
l3 and ill. The cathode is surrounded by means
is mounted in contacting relationship with the
of the shielding member l5 having a front cover
mica and a thin foil 49, preferably gold, wrapped
member I6 provided with
elongated aperture
around these elements to provide the deflecting
16' through which the electrons from the cathode
l2 are directed. This electrode assembly is 55 electrode. The wrapped foil produces a smooth
lens edge eliminating any burrs. These deflect
mounted between a pair of insulating spacer
ing electrodes are assembled on the arms 26 and
members I‘! and i3 and clamped to the same by
2‘! so that the tabs or lugs, such as 46 and 4'5
means of the strap l5 and positioned between the
register with the arms and are secured thereto
micas by means of the ears such as 29-2ii'.
Mounted at the other end of the envelope is a 60 by straps such as 28’ fastened by welding, for
collector 2! in the form of a 1001?) supported by
means of the support and lead 22.
F
example, to the arm.
The aperture plate as
sembly and de?ecting electrodes provide an elec
tron lens as described in a co-pending application
Positioned between the cathode and the col
of George Ross Kilgore, Serial No. $12,625 ?led
lector is the aperture, lens and beam de?ecting
electrode assembly. The aperture, lens and beam 65 June 27, 1940 and assigned to the same assignee
as the present application. This construction
de?ecting electrode assembly is formed as a unit
eliminates any surfaces between the de?ecting
and includes the aperture portion, designated
electrodes and the intercepting wire and on which
generally at 25 and which will be described in
any surface charges could exist.
greater detail below, provided with horizontally
Because all parts are held against flat surfaces
extending arms 26 and 2'! which support the de 70
tilting of electrodes is avoided. The aperture
?ecting electrodes 23-29 and the intercepting
plate ‘assembly is simple to make and the lens
wire 30 anchored at its lower end and maintained
edge easier to control.
in tension by means of the spring anchor SI per
The aperture assembly made according to my
mitting expansion and contraction of the wire but
always assuring alignment. The wire is guided 75 invention is shown in greater detail in Figures 5
2,409,165
5
6
and 6. In accordance with my invention, I pro
vide a pair of elongated U-shaped elements 50
in producing a tube which functions in the de
siredv manner.
While I have indicated the preferred embodi
ments of my invention of which I am now aware
offset portion, such as 55 and 55'. Spot welded
and have also indicated only one speci?c applica
to the inside surfaces of these portions are the
tion for which my invention may be employed,
spring aperture elements 56 and 51 provided with
it will be apparent that my invention is by no
spring ribs 58 and 59, 6!! and (ii. The U-shaped
means limited to the exact forms illustrated or
members
and 5| are separated by means of
the use indicated, but that many variations may
separator elements 53-54 which are provided
with lugs, such as 5G’ and 53’, which extend down 10 be made in the particular structure used and the
purpose for which it is employed without depart
between and separate the spring members 56 and
ing from the scope of my invention as set forth in
51, the rib portions 58 and 59, 50 and 6! contact
the appended claims.
ing the opposite surfaces of the lug, thus deter
What I claim as new is:
mining the width of the opening of the aperture
1. An electron discharge device having a cathode
formed by the ribs. The inserts are so dimen 15
means for supplying electrons, and an electrode
sioned that the ribs are held against the spacer
in the path of said electrons, and beam de?ning
lugs and spring tensioned. In practice these
means positioned between said cathode means
apertures may be .004 inch and the die-formed
and said electrode and through which the path
spring members may be formed from rectangular
blanks of sheet Nichrome .002 inch thick. As 20 of the beam of electrons lies, said beam de?ning
means including a pair of oppositely disposed
shown in greater detail in Figure 10 the portion
conducting members spaced apart to provide a
between the ribs is formed ?at and parallel to the
ribs to permit proper seating in the recess portion
passageway therebetween, registering spring-like
55, for example, of the U-shaped elements. The
elements mounted on said conducting members
and having ribs extending transversely of the
ribs of the insert are thus supported on portions
offset from the web and these portions consti
beam path on opposite sides of the beam path,
tute ?exible members or springs carrying the ribs.
and extending toward each other to provide an
The aperture openings as above described are,
aperture therebetween, and means at opposite
therefore, substantially equal to the lug thickness
edges of said spring-like elements for maintaining
and are independent of variations of two or three ‘
said ribs in spaced relationship for positively de
thousandths of an inch in the dimensions of other
termining the aperture width.
parts. Thus the correctness‘ of the aperture
2. An electron discharge device having a cathode
and 5 I, each of which is provided with a recess or
opening within a few ten-thousandths of an inch
depends upon one easily controlled dimension,
namely the lug thickness, while the dimensions
means for supplying electrons, and an electrode
in the path of said electrons, and beam de?ning
means positioned between said cathode means and
said electrode and through which the Path of the
beam of electrons lies, said beam de?ning means
of the other parts may be held only to the ordi
nary tolerances of tube manufacture.
By the arrangement shown in Figure 10, for
including a pair of oppositely disposed conduct
example, the spacer member 65 may have two
ing members spaced apart to provide a passage
recessed portions permitting the width of the 40 way therebetween, registering spring-like ele
apertures to be less than the width of the spacer
ments mounted on said ?at surfaces and having
and also to have different widths. For this pur
elongated ribs extending transversely of the beam
pose the spacer may be provided with coined de
path on opposite sides of the beam path and ex
pressions in its lug with which inserts cooperate.
tending toward each other to provide an aperture
In Figures 8 and 9 are shown the method em 45 therebetween.
ployed for manufacturing a coined spacer. A
3. An electron discharge device having a cathode
continuous strip of thin metal 65, shown ?atwise
means for supplying a beam of electrons and an
in Figure 8 and edgewise in Figure 9, has narrow
electrode in the path of said electrons, and a beam
depressions 66 and B7 stamped or coined across
de?ning and de?ecting means positioned between
it at predetermined intervals so that, when the 50 said cathode means and said electrode and
strip is cut along the dotted lines, spacers, each
through which the path of the beam of electrons
with two embossed depressions in its lug, are
passes, said beam de?ning and deflecting means
formed therefrom. The order of procedure is
including a pair of oppositely disposed elongated
important. The coining of the depression is done
U-shaped members, spring inserts mounted at the
after the strip is cut to width whereby the cutting 55 closed end of said U-shaped members and having
burrs at the inner edge of the lug are coined
ribs extending transversely of the beam path and
down so as not to interfere with the seating of
toward each other to provide an aperture through
the insert ribs against the bottoms of the coined
which the beam path passes, and means carried
depressions.
by said U-shaped members and extending be
In Figures 11 and 12 are shown alternate forms 60 tween said spring inserts for maintaining said ribs
of rib-bearing spring inserts in relation to sec
in spaced relationship for determining the width
tions of the U-part webs appropriate thereto.
of the aperture between said ribs.
In Figure 11 for example the spring elements 5'?’
4. An electron discharge device having a cathode
and 58’ have their lugs extending through aper
means for supplying a beam of electrons and an
tures provided in the U-shaped members 50 and 65 electrode in the path of said electrons, and a beam
5|’ and abut the spacer 65’. In Figure 12 as in
defining and de?ecting means positioned between
Figure 11 the ribs of the aperture elements 58"
said cathode means and said electrode and
through which the path of the beam of electrons
and 57" merely constitute the turned up edges
of the spring which abut directly on the spacer
lies, said beam de?ning and de?ecting means in
70 cluding a pair of oppositely disposed elongated
element 55'.
U-shaped members, the legs of which lie parallel
Thus with my improved form of device I ac
to the beam path, spring inserts mounted at the
complish the objects enumerated above in a sim
closed end of said U-shaped members, each hav
ple and effective manner, reducing the parts re
ing a pair of ribs extending transversely of the
quired, the operations required and insuring
greater accuracy of the various elements involved 75 beam path, the ribs of each pair registering with
2,409,165
7
8
the opposite pair of ribs and providing a pair of
U-shaped elements, the closed ends of which are
positioned adjacent the cathode and the ends
of the legs of which are positioned adjacent the
electrode, said U-shaped members having offset
5. An electron discharge device having a cathode
means for supplying a beam of electrons and an b portions providing recesses in the closed end
thereof and spring-like inserts mounted within
electrode in the path of said electrons, and a beam
said recesses, each or said inserts having a pair
de?ning and de?ecting means positioned between
apertures successively positioned along the beam
path.
‘
said cathode means and said electrode and
through which the path of the beam of electrons
of ribs extending transversely of the beam path
and toward the opposite pair and providing a pair
passes, said beam de?ning and de?ecting means 10 of successively positioned apertures, and spacer
including a pair of oppositely disposed elongated
U-shaped members, the legs of which lie parallel
members clamped between oppositely disposed
legs or said U-shaped member for spacing said
U -shaped members and each provided with a lug
to the beam path, spring inserts mounted at the
extending between and in contact with said op
closed end of said U-shaped members and having
-- itely disposed pairs of ribs of said spring-like
ribs extending transversely of the beam path and
sarts for determining the aperture width be
in registry with each other to provide an aperture,
en said ribs. said spacer members being
and spacing means carried by said U-shaped
shorter than the legs of said U-shaped members
members, said spacing means including spacer
and providing slots, and a rod-like element posi
elements between the legs of said U-shaped mem
bers for maintaining said U-shaped members in 20 tioned within said slots, and deflecting electrodes
mounted between each pair of legs of each U
spaced relationship and each having a lug inter
shaped member and on opposite sides of the beam
posed between the ribs of said spring inserts and
path for de?ecting the electron beam.
in contact with the ribs for maintaining a pre
8. An electron discharge device having cathode
determined spacing bctween said ribs for deter
means for supplying a beam of electrons, and an
mining the width of the aperture between said
electrode in the path of said electrons, and a beam
ribs.
de?ecting electrode assembly positioned between
5. An electron. discharge device having a cathode
means for supplying a beam of electrons and an
said cathode means and said electrode and
electrode in the path of said electrons, and a
beam de?ning and de?ecting means positioned
between said cathode means and said electrode
and through which the path of the beam of elec
through which the beam path lies and including
a pair of oppositely disposed members, spring-like
inserts supported on said members, each having
a pair of ribs extending transversely of the beam
_ trons passes, said beam de?ning and deflecting
path, the ribs on one insert extending toward the
ribs on the other and providing a pair of succes
means including a pair of oppositely disposed
elongated U-shaped members having legs extend
sively positioned apertures and spacers positioned
between said oppositely disposed members and
ing parallel to the beam path, spring inserts
having portions of di?erent thicknesses positioned
mounted at the closed end or” said U-shaped
between each pair of oppositely disposed ribs at
members and having registering ribs extending
the ends thereof, whereby the aperture Widths
transversely of the beam path and providing an
aperture, spacing means carried by said U 40 differ from each other.
An electron discharge device having cathode
shaped members including spacer elements be
means for supplying a beam of electrons, and an
tween said legs for maintaining said U-shaped
electrode in the path of said electrons, and a beam
members in spaced relationship and having a
d iecting electrode assembly positioned between
lug interposed between the ribs of said spring in
said cathode means and said electrode and
serts and in contact with the ribs for maintaining
through which the beam path lies and including
a predetermined spacing between said ribs for
a pair of oppositely disposed conducting members
determining the width of the aperture between
having ?at surfaces, spring-like inserts supported
said ribs, said spacing elements being shorter
on said ?at surfaces, each having a pair of ribs
than the legs of said U-shaped members whereby
extending transversely of the beam path, the ribs
a slot is provided at the ends of the legs of said
U-shaped members and a rod-like element re
ceived’ within said slot.
7. An electron discharge device having cathode
means for supplying a beam of electrons and an
electrode toward which said beam of electrons is
directed, a beam focusing and de?ecting electrode
assembly positioned between said cathode means
and said electrode and through which the beam
path extends and including a pair of elongated
on one insert extending toward the ribs on the
other and providing a pair of successively posi
tioned apertures and a spacer positioned between
said conducting members and having portions of
different thicknesses positioned between each pair
of oppositely disposed ribs at the ends thereof,
whereby the aperture widths di?er from each
other,
HARRY C. THOMPSON.
Документ
Категория
Без категории
Просмотров
0
Размер файла
799 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа