close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2126894

код для вставки
Aug. 16, 1938.
M. ‘KNOLL E1" AL
2,126,894,
INDIRECTLY HEATED CATHODE
Filed July 10, 1934
,5
ATTORNEY
Patented Aug. 16, 1938
2,126,894
UNITED stares ‘PATENT OFFICE?) ~
2,126,894.:
lNB-IRECTLY
1
'
CATHODIE...
Max Knoll and Rudolf R-z'ehnllra, ‘Berlin,- Ger-1
many, assignors tel T‘elefunken 'Gcsellschaft’:
fiir Drahtlcse Telegraphic m. b. 11., Berlin, Ger
many, a corporaticn of Germany
Application July
10, 1934, Serial No.
In Germany May 4, 1933' 734,464
4 Claims.
The present invention is concerned with an in
(Cl. 250-—27.5)
directly heated cathode for cathode ray or Braun
tubes.
_
.
a
The technical problem involved in these tubes
di?ers from. that involved in an ampli?er tube
insofar as inthe case .of the Braun tube the chief
consideration is not merely to insure as large an
vention shall be described in what follows by ref
erence to the accompanying drawing.
Referring to Fig. 1, l9 denotes the heater wire
of the indirectly incandesced cathode, H is a
sheet of metal positioned at right angles to the
tube axis which is indicated by the line A, B. The
electron emission current as possible, as is true of
the ampli?er tube, but rather that the electrons
given oiT from the cathode should pass through
the anode (diaphragm) in the form of as slender
feasible and should thus
the ?lament H] by hard-soldering (brazing) or 10
may be welded together therewith at the point
marked
strip
0. P, if desired, by the aid of a sheet-metal
Referring to Fig. 2, the reference symbols I ll, ,
A, B, K, have the
anode; hence, this
right angles to the tube axis A, B, and it supports
the electron emlssive substance K upon its face 20
turned towards the anode. The sheet [2 at the
that the electron pencil emitted by the cathode
25 must be capable of being acted upon by the so—
called Wehnelt or focusing cylinder of a similar
control means.
For these reasons, the form of indirectly heated
cathode for Braun tubes heretofore generally em
end opposite or turned away from the anode has
an extension or projection I 3 which is either weld
ed together with the heater H1 or is merely secured
thereon by clamping action.
According to another embodiment of this in
vention
as
illustrated
'
'
30
35
In Figs. ‘la-4c are shown embodiments of the 5.3 L1
In order to obviate the drawbacks associated
therewith, i. e.,
invention in which the electron-emissive sub
'
The body being indirectly incandesced by the
sion substance, according to this invention.
In Braun tubesrfor television work, when using
heater Winding and denoted by I I, in Fig. 1, by
l2 in Fig. 2, and’ M in Figs. 3 and 4, consists
a form for the indirectly heated cathode accord
ing to this invention, there results still another
lower than under otherwise equal conditions.
A number of embodiments according to this in
55
2,126,894
2
3. An unshielded point-source thermionic cath
Having thus described the invention what we
claim and desire to secure by Letters Patent is:
ode comprising a hollow ferro-magnetic cylinder
1. An unshielded point-source thermionic cath
having a tip on its axis, a non-conducting hollow
ode comprising a hollow metallic cylinder closed
cylinder planarly closed at one end, disposed
at one end by a hollow solid of revolution having
within the ?rst of said cylinders with said planar
surface adjacent to the closed end of the ?rst of
said cylinders, a ?lament winding disposed longi
tudinally within the second of said cylinders, and
Cl a projection of maturely reduced diameter at its
apex, a non-conducting hollow cylinder planarly
closed at one end disposed within the ?rst of
said cylinders with said planar surface adjacent
to the closed end of the ?rst of said cylinders, a
10
?lament winding disposed longitudinally within
the second of said cylinders, and a thermionic
emissive coating on the end portion of the ex
15
closed at one end by a hollow frustum of a cone
a thermionic emissive coating on the end por
10
tion of the exterior surface of the tip of the ?rst
of said cylinders.
4. An unshielded point-source thermionic cath
ode comprising a hollow ferro-magnetic cylinder
terior surface of the projection of the ?rst of
closed at one end by a hollow solid of revolution 15
said cylinders.
having a projection of reduced cross sectional
2. An unshielded point-source thermionic cath
ode comprising a hollow metallic cylinder closed
area at its apex, a non-conducting hollow cylin
inder planarly closed at one end, disposed within
the ?rst of said cylinders with said planar surface
der planarly closed at one end, disposed within
the ?rst of said cylinders with said planar sur~
face adjacent to the closed end of the ?rst of
said cylinders, a ?lament winding disposed longi
tudinally within the second of said cylinders, and
adjacent to the closed end of the ?rst of said
a thermionic emissive coating on the end portion
at one end by a hollow fl‘llStllLlIl of a cone, having
a tip on its axis, a non-conducting hollow cyl
cylinders, a ?lament winding disposed longitudi
nally within the second of said cylinders, and a
thermionic emissive coating on the end portion
25 of the exterior surface of the tip of the ?rst of
said cylinders.
of the exterior surface of the projection of the
?rst of said cylinders.
MAX KNOLL.
RUDOLF RZEI-IULKA.
Документ
Категория
Без категории
Просмотров
0
Размер файла
232 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа