close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2126286

код для вставки
Aug. 9, 1938.
K. SCHLESINGER
2,126,286
BRAUN TUBE
Filed June 11, 1954
2 Sheets-Sheet 1
Ur: ueni‘oc:
Aug. 9, 1938.
K. SCHLESINGER
2,126,286
BRAUN TUBE
Filed June 11, 1934
2 Sheets-Sheet 2
I
/
~
w
fii?ill
B
l
5
I
On-uen'toz:
’” My?
MW.
44
Patented Aug. 9, 1938
2,126,286
UNlTED STATES PATENT‘ OFFICE
2,126,286
BRAUN TUBE
Kurt Schlesinger, Berlin, Germany, assignor to
Radioaktiengesellschaft D. S. Loewe, Berlin
Steglitz, Germany
Application June 11, 1934, Serial No. 730,111
.
Germany June 10, 1933
-
16 Claims. (Cl. 250-275)
(Granted under the provisions of sec. 14, act of
March 2, 1927; 357 0. G. 5)
The object of‘ the invention is a Braun tube,
operated under high vacuum, with electrostatic
a negatively biassed electrode of suitable form.
The lens itself producing the optical e?ect
according to the invention then consists practi
According to the invention, the stream of elec
cally of the negative element and one of the said
5 trons is controlled in its intensity, preferably by positive elements, the braking ?eld~ extending 5
space charge control, and by the use of suitable mainly between those two electrodes. The sec
electrostatic ?elds or if desired also by the use of ond positive electrode allows of adjusting the
focus of the system without changing the speed
intermediate diaphragms, is preliminarily concen
which
the electrons have before they enter the
trated
and
projected
on
to
a
diaphragm.
The
10
aperture of this diaphragm, in accordance with system. Therefore this ~third electrode is practi- 1o
concentration of the ray.
\
I
the invention, is reproduced on the luminous
screen of the Braun tube by means of an elec
15
tron-optical system of constant focus.
Since the aperture in the diaphragm acts as
surface of constant form and size but varying
light intensity, it is possible in this fashion to
produce image points, which are not dependent
on their intensity as regards form and size, and
in consequence also remain unaltered when a
change-over takes place from lightest white to
darkest black.
The diaphragm aperture to be reproduced on
the luminous screen, the form of which aperture
25 determines the form of the image point, is con
veniently made as small as possible (for example,
less than 1 mm.’), and may be furnished with‘
a rectangular, hexagonal or other suitable form.
In order to avoid a thermal overloading of this
O
diaphragm, the preliminary concentration device
is constructed'in such fashion that the greatest
preliminary concentration takes place when the
intensity of the ray is at its maximum.
35
The diaphragm itself is preferably made of a
good heat-conductive material with the highest
possible fusing point, which material at the same
time enables the diaphragm aperture to be fur
nished with a very exact form (clean-cut edges).
40
According to the invention, the diaphragm may
conveniently consist of two parts, viz., a support
ing ring composed of a suitable material, such as
copper, and a diaphragm portion connected with
this supporting ring and furnished with the aper
45 ture, said portion consisting of a suitable material,
such as tungsten, tantalum or molybdenum.
As electron-optical system (electron lens) there
are employed in accordance with the invention
preferably systems which are constructed in such
50 fashion that the speed of the ray when passing
through the same remains unaltered, or practi
cally unaltered.
It is particularly convenient to employ systems
which comprise fundamentally two positively
55 biassed electrodes, between which there is located
cally of a great value but is not necessary as to
the reproducing function of the system.
In this connection the positive electrodes may
conveniently be constructed in the form of annu
lar plates having aperture of the order of, for 16
example, approximately 5 mm., and if desired
united by means of a metallic cylinder to form
a sleeve, in'the interior of which there ispro
vlded the negatively biassed electrode.
The negative electrode, in accordance with the 20
invention, may be constructed, for example, in
the form of a funnel-shaped electrode, the diam
eter of the smaller funnel preferably being ap
proximately equal to the diameter of the openings
of the positive electrode.
25
It is particularly convenient to make the nega
tive electrode in the form of annular electrode
with short set-on metallic cylinder. In this con
nection the diameter of the annular plate aper
ture will preferably be made almost as large as 30
the diameter of the apertures in the positive elec
trode, for example of the order of approximately
5 mm. On the other hand the set-on metallic
cylinder lsfurnished with a diameter of approxi
mately twice the size.
35
It is also possible to employ as negative ?eld
generator an annular plate composed of insulat
ing material, which is furnished on the one side
with a spiral coating of a semi-conductive sub
stance (for example, ‘a highly ohmic spiral com- 40
posed of graphite or colloidal carbon) the com
mencing point of the spiral situated adjacent the
aperture being connected with a suitable positive
potential and the end point thereof with a suit
able negative potential, so that the potential 45
decreases in proportion to the spacing from the
centre point.
_
According to one feature of the invention the
spacing of the negative electrode from the posi
tive electrode directed towards the tube cathode 50
is made as small as possible, so that a braking
?eld of any appreciable kind is not formed be
tween these two electrodes.
}
The two positive electrodes of the system are
connected with each other, and may conveniently 65
2
2,126,286
n"
have the same potential as the anode of the tube.
The focus of the system may be adjusted as
the invention insofar as the same also allow of
desired by 'varying'the ,potential of the negative
compact assembly of the system.
electrode.
According to a ‘further feature-of the invention
it is possible to produce images with a small sur-:
face, i. e., images of that nature, the diagonals
of which do not di?eii appreciably from the di
ameter of the neck of the tube in which the parts
of the system are arranged. In this connection
the diameter of the tube may conveniently be 10
In order to dispense with outside con
nections this electrode if desired may be con
nected with the part of the system producing the
preliminary concentration.
v
If the negative electrode is arranged in, the
electron-optical system in such fashionthat the
10 smaller aperture thereof (small funnel aperture
or cylinder holding plate) is directed towards ‘the
the production of the smallest image points with
.
selected up to approximately 10-15 cm.
.
By reason of this dimensioning of the image
tron-optical system acts in exactly the same man-l it is possible to make‘ the distance of the de?ect
nor as an optical collecting lens. _
ing systems from the image screen comparatively
Accordingly when using a system of this nature small.
f
>
15
15
the size of the image point with given size of the
Thus, the electron-optical system may be ar
aperture in the diaphragm is determined by the ranged in such fashion that its spacing from the
ratio between the distance of the diaphragm to image screen is considerably less than its dis
be reproduced from the electron-optical system tance from the diaphragm to be reproduced, so
20 vand the distance of the electron-optical system that the latter may be reproduced on the image 20
, positive electrode on the cathode side, the elec
4 from the image screen.
-
Since on the one hand it is impossible in prac
tice to make the diaphragm aperture too small
and on the other hand, for technical reasons, the
25 image point may not exceed a certain size, which
is dependent on the size of the image and the
number of lines, the diaphragm, the opening of
which is to be reproduced, is arranged, according
to the invention, as far as possible from a prac
30 tical point of view away from the electron-optical
system.
A distance of approximately 6-8 cm., which
with a length of bulb amounting to, say, 30 cm.
cqrresponds with an approximately fourfold or
35
screen even on a reduced scale.
The image produced in this fashion/may then
be reproduced on a desired scale of enlargement
by suitable optical means. _ According to an additional form of embodi
25
ment of the invention the path of the ray within
the neck 'of the tube may be multiplied by a
single or multiple deviation of the ray.
In this manner it is also possible in direct fash
ion to produce television images of large size with 30
small image points without necessity for increas
ing the‘ length of the tube.
The deviation of the ray may preferably be
caused by the use of magnetic ?elds.
The image point distribution may conveniently 35
be performed by the use of pairs of de?ecting
?vefold enlargement, has been found to be fully
su?lcient in practice.
According to the invention, the space between , plates having the de?ecting plates disposed in
I the diaphragm and the electron-optical system
is preferably screened 011’ both against electro
titled relation to each other in the manner
known per se. To avoid cross-current error the
40 static as well as magnetic e?ects. The screening
means may conveniently consist of a metallic
plates may be negatively biassed in relation to 40
electron-optical system is disposed in such fash
ion that the smaller aperture thereof (small fun
nel aperture‘ or cylinder holding plate) is di
rected towards the positive electrode on the image
screen side, the electron-optical system corre
sponds fully in its properties with an optical dis
to prevent the same from penetrating into the
neck of the bulb containing the parts of the 50
the ray,
cylinder, which may possess the same potential
Between the de?ecting plates and the image
as the diaphragm, for example is passed to earth, screen there may be provided in accordance with
and if desired may be conductively connected the invention a preferably large-surface inter
45 with the positive electrodes of the electron-opti- ( cepting electrode, which is maintained at a po 45
‘ cal system.
tential that is positive in relation to the posi
If in contradistinction to the arrangement tive electrodes of the electron-optical system, and
above described the negative electrode of the serves to intercept the return-?ow electrons and
55
persing lens.
>
According to another feature of the invention
it is now quite readily possible by the use of dis
persing lenses of this nature, or by the combi
nation of electron-optical dispersing and collect
ing lenses, or also by the combination of col
lecting lenses of different focus (i. e., electron
optical systems, the negative electrodes of which
are biassed to different extents whilst the posi
tive electrodes possess the same potential) to
65 conduct systems, which do not produce magni?ed
images of the diaphragm, aperture, but project
the same on to the image screen in natural size
or on a reduced scale.
_
Since the electron-optical collecting and dis
70 persing lenses correspond fundamentally with
the optical arrangements, it is possible to as
semble di?erent systems of this nature according
to the principles well known in the optical art.
-The use of combined systems of this charac
75 ter is of considerable importance according to
system.
On the inside of the wall of the tube there
may be provided a metallic coating, which com
mences at approximately the level of the inter
cepting electrode and extends at least 8-12 cm. 55
into the bulb of the tube.
In order to produce bright and at the same
time comparatively small image points, it may
be convenient to illuminate the diaphragm a'per
ture, which is to be reproduced, by means of a 60
bundle of electrons directed as far as possible
parallel, i. e., to pre-concentrate the ray prefer
ably in such fashion that the electrons proceeding from the cathode enter as far as practically
possible parallel into the aperture in the dia 65
phragm.
'
According to a further feature of the inven
tion, there are provided between the cathode and
the diaphragm to be reproduced concentrating
means which may consist of two electron-optical 70
systems, of which the one functions preferably
as collecting lens and the other as dispersing
lens.
'
.
~The electron-optical systems may each consist,
in the manner set forth above, of one or two ele
75
3
42,126,286
time linked up with a high positive potential,
and one preferably cylindrical suitably biassed
- element.
of secondary electrons, the part of the anode di
The operation of the’ electron-optical‘ , rected towards the cathode may conveniently be
system (i. e., the action as collecting or dispers
' ing lens) is determined solely by the extent and
sooted. Further, the anode is preferably linked
up with a potential as high as possible.
nature of the bias of this intermediate element
Fig. 3 shows an electron-opticaT‘collecting lens
in relation to‘ the outer elements. There may
be said generally that completely similar elec
system, in which the negative electrode is con
structed in funnel-like form. According to the
tron-optical systems may be employed for the
preliminary concentration of the ray andfor the
reproduction of the anode aperture on the
screen.
.
,
illustrated by way of example in the drawings
in
which
a
.
,
Fig. 1 shows the most elementary form of the
total arrangement with a simple electron-optical
system of the collecting lens type, whilst in
Fig. 2 there is shown a form of embodiment of
the anode, in ,
‘ Figs. 3 and 4 two different types of electron
optical collecting lenses, and in
Fig. 5 an electron-optical dispersing lens.
Fig. 6 shows a spiral semi-conductor electrode
according to the invention, whilst
Fig. 7 illustrates the combination of two of
these electrodes to form a preliminary concentra
tion system.
Fig. 8 shows a Braun tube according to the in
vention having pre-concentrating means of
another type.
Fig. 9 shows an arrangement with single devia
tion of ‘the ray, and
>
Fig. 10a detail of the arrangement illustrated
in Fig 9, whilst in
_
Fig. 11 there is'indicated an arrangement with
double deviation of the ray.
The combination of a plurality of electron
optical collecting or collecting and dispersing sys
tems accordingto the invention has not been
particularly shown, as these di?'erent combina
' tions ‘may be readily obtained from the stated
elements.
invention, the distance of the two funnel aper
tures from the positive electrodes is preferably 10
made as small as possible, approximately 1 mm.
or less.
Some forms of embodiment of the tube accord
ing to the invention and also certain details are
.
In Fig 1:
i is the hot cathode, which preferably may be
constructed as an indirectly heated equipotential
‘
In the system illustrated in Fig. 4 the negative
electrode consists of the holding plate l9 and the
set-on cylinder Hi, the diameter of which may 15
conveniently amount to twice the diameter of
the opening of the holding plate.
If, as shown in Fig. 5, the negative electrode is
arranged in such fashion that the larger aperture
thereof is directed towards the positive plate on 20
the cathode side, the electron-optical system is
able to act, as a dispersing lens.
In Fig. 6:
20 is an insulating plate with the aperture 22,
on which there is provided the spiral 2i con 25
sisting of a semi-conductive material. The com
mencing point 24 of the spiral is connected with a
positive potential (for example, the anode poten
tial) , and the end of athe spiral 23 with a suitable
negative potential.
'
'
Fig. '7_ shows a system consisting of two elec
trodes 'of this nature, which system may be em
tion system.
The intermediate electrode in the electron-op
tical system according to the invention requires
to be furnished with merely a weak ‘negative bias,
for example to the extent of 200-500 volts, in
relation to the outer electrodes. Since this nega
tive bias determines the focus of the system, the 40
same should be selected in individual cases with
consideration to the speci?c data of the tube.
The tube according to the invention may be
operated with the relatively low anode potentials
(for example, 1000-3000 volts) usual in the case of
gas tubes. Thus, for example, it is possible to im
part to the anode of the tube a potential of
merely approximately 1000-1500 volts, and if de
sired to employ the wall coating as after-accelera
the preliminary concentration element, ii the dia- Y
tion anode.
tron-optical system with the positive electrodes 6
and 8 and the electrode 7, which is furnished with
a negative bias in relation thereto (for example,
of approximately 200-500 volts), 9 and iii are
the two pairs of de?ecting plates, i2 is the inter
cepting electrode, l3 the metallic wall‘ coating,
and it the luminous screen.
'
1‘
It is, however, also possible to impart to the
provided according to the invention, and in this
manner to effect after-concentration in the space
of the bulb.
In Fig. 8:
i is the cathode with the emissive surface 25,
2 the Wehnelt cylinder with the control plate 26,
25 an electron-optical system acting as collecting 60
lens, and 33 an electron-optical system acting as
dispersing lens, whilst H is the electron-optical
system which reproduces the diaphragm opening
nected with each other, and. if desired the elec
21 on the image screen. The system 29 consists of
necessary for large-size television images with
a simple electron-optical collecting system. '
As shown in Fig. 2, the anode 4 may conveni
ently consist of a holding ring I5 of suitable mate
rial, ‘such as copper, which carries the small plate
i6 having the diaphragm aperture 41, this plate
consisting, for example, of tantalum. In order to
50
metallic wall coating a potential which is nega
tive as compared with the intercepting electrode
All of the electrodes are preferably connected
to form a system by the use of insulating holding
means. The anode s, the cylinder 5 and the
plate electrodes 6 and 7 may be conductively con
trodes 6 and 1 supplemented to form a cylinder.
The length of the cylinder 5 may be selected up
to'approximately 15 cm. A dimensioning of this
kind enables points to be produced or a size
30
ployed, for example, as preliminary concentra
large surface cathode, 2 the space charge control
cylinder with the control plate drawn down, 3
phragm, which at the same time may be used
as the anode, 5 the screening cylinder, i I the elec
v
.avoid or reduce as far as possible the occurrence
the two (preferably earthed) plates 28 and 3|, 65
which are raised to anode‘ potential, and the cyl
inder 30 which is arranged between the same and
possesses a comparatively strong negative bias
(for example —400 volts) in relation to the plates
28 and 3|. 34 is the wall of the tube.
70
The potentials of the system I l, i. e. the po
tentials applied to the plates 6 .and 8 and the
inner element 1 may correspond with the poten
tials of the system 29.
In contradis'tinction thereto the inner element 75
4
araaase
32 in“ the case of the system.33 comprising the
plates 3! and 3 and the cylinder 32 is weakly
cathode ray M is first diverted by 180°_ by the
?eld of the magnet 35-, and then by a further 180%
positively biassed (for example, to the extent of
by the ?eld of the magnet 36, so that its ?nal di
200 volts) in relation to the outerplates. The
system 33 consequently acts as dispersing lens.
rection is parallel with its outlet directi/on. Ac-'
By the combination of the two systems 29 and
33 it is possible to embrace the entire emission
of the cathode by the system I I, and in this man
ner to produce comparatively small and extremely
arrange the- cathode and magnet ?elds'in such
fashion that the ?nal direction of the cathode
cording to the invention, it is also possible to,
ray coincides with the axis of the tube.
.
In the arrangement according to Fig. 11 ther
is end loyed as preliminary concentration system 10
10 bright image points.
The dispersing lens 33, in accordance with the , a system comprising the preliminary anode 44,
invention, may preferably be constructed in such the main anode 3, and the element‘ 3, which is
that its focal point coincides with the point of
arranged between the two and is weakly negative
in relation to the preliminary anode.
The potentials of the preliminary concentration .15
system should always be adjusted in such fashion
intersection of the rays of the condenser system
28, which point‘ in turn is disposed in or behind
that the electronic ray is preliminary sharply con
centrated on the aperture in the diaphragm 4,
the diaphragm 6. The aperture of the dispersing
and the potentials of the electron-optical system
fashion-either by suitable dimensioning of the
system elements and their spacing, or more pref
15 erably by correct adjustment of the potentials
should be so chosen that the same reproduces the 20
20 lens and also its spacing from the diaphragm are
preferably so chosen that the size of the dia- _ diaphragm aperture sharply on the image screen.
phragm aperture is fully - utilized.
It has been found to be necessary in the ar
In Figs. 9-11:
3% is the wall of the tube, i the cathode, 2 the
Wehnelt cylinder with the drawn down control
plate 26, 3 and 3 are electrodes forming among
rangement according to the invention also to
them the preliminary concentration systems, 6,
the invention this complete .part of the path of
the ray is screened o? fully against both mag
‘l and 8 electrodes forming among them the re
producing electron-optical system, 9 and iii the
80 de?ecting plates, 35 and 36 the magnet systems,
31 and 3B poleshoes arranged within the tube, and
62 is the cathode ray.
'
As shown by Fig. 9, the cathode ray emitted by
l is controlled by the use of ,the plate 26 (the
35 control potential is applied between the cathode
i and the plate 26) preliminarily concentrated
by the system comprising the anode 3, which may
consist of a perforated plate with set-on cylinder
or may also be constructed in mould-like form,
40 and the high-tension anode 3, turned by the ?eld
generated by the magnet 35, and projected on to
the image screen by the system comprising the
elements 6, ‘I and 8, the aperture in the diaphragm
1i which preferably is made as small as possible
being reproduced on the image screen in natural
size or on reduced scale.
~
In the arrangement according to Fig. 9 the pre
liminary concentration system comprises the
preliminary anode 3 with the set-on cylinder,
50 which may be furnished with a comparatively
netic as well as electrostatic ?elds of interference
by screening means arranged either within or on 30
the outside of the tube. Such screening means in
their simplest form consist of an iron or the like
tube of 1/2-2 mm. wall thickness. ,.
'
The invention is in no way limited to the forms
of embodiment quoted merely by way of example. 35
It is in fact quite possible to employ other suit
able electrostatic preliminary concentratlon or
collecting systems. The deviation of the cathode
ray may also be performed in suitable manner
as desired.
The tube according to the ‘invention combines
the advantages of the previously known ‘gas tubes.
(low anode potential, wattless concentrationand
control) with those of the known high vacuum
tubes (great sharpness of the point and lack of 45
secondary light ‘caused by slow secondary elec
trons) without the disadvantages of these types
of tubes.
If desired, the tube according to the invention
may be operated with a ?lling of gas (preferabl
50
as weak as possible).
vo ts).
comprising one'plate-shaped element having an
aperture and being adapted to be supplied with 575
The electron-optical system consists of the two
positively biassed plates 6 and 8, between which,
in the manner described above, there is arranged
the element 1, which is furnished with a negative
bias in relation to the main plates and isvcon
00
structed, for example, in the form of a cylinder'
plate. The distances between ‘i on the one hand
and 8 and 8 on the other hand should be made
as small as possible.
In this manner it is ac?
complished that the electronic ray does not vary
its speed when passing through the system. The
described electron system acts as an in?nitely
thin optical collecting lens.
The plates 6 and 8, if desired, may be united
70 with the plate 4 and the element 1 with the ele
ment 3 to form a structural unit.
A possible form of arrangement and embodi
ment of the pole shoes 31 and 38 and of the mag
net 35 is illustrated diagrammatically in Fig. 10.
75
on its path between the diaphragm and the
electron-optical system. According, therefore, to
low positive potential (for example, 300-500
volts), and the anode it, which is_connected with
a lliigh positive potential (for example, 1500-2000
55
avoid even the slightest action on the cathode ray ‘
In the arrangement shown in Fig. 11, the
I claim:
'
-
Y
1. An electron-optical system for Braun tubes
a high positive potential, and‘ a second plate
shaped element having an aperture and being fur
nished at least at its side facing the ?rst said
element with a metallic. cylinder, the diameter of
which is considerably greater than the diameter
of said aperture, said second element being
adapted to be supplied with a lower positive po
tential than said ?rst element.
2. An electron-optical system for Braun tubes
comprising one plate-shaped electrode having a 65
'diameter considerably above 10 millimetres, said
plate-shaped electrode having an aperture, the
diameter of which is in the order of ?ve mm.,
said electrode being adapted to be supplied with
a high positive potential, and a second plate 70
shaped electrode having a diameter considerably
above 10 millimetres, said second plate-shaped
electrode having an aperture, the diameter of
which is in the order of ?ve mm. and being fur- '
nished at its side facing the ?rst said electrode 75
5
2,126,286
withma metallic cylinder surrounding said aper said anode and said screen and means for repro
ture, the diameter of said cylinder being in the
ducing said aperture on said screen. >
order or ten nim., said second electrode being
adapted to be supplied with a positive potential
which is lower than the potential which the ?rst
prising an evacuatedenvelope, a cathode and an
said electrode is to be supplied with.
said anode
‘
_
3. An electron-optical system for Brand tubes
comprising one plate-shaped electrode having a
7. A Braun tube for television purposes com
anode arranged in operative relationship‘ thereto,
aving an aperture, means for con
centrating the cathode ray into saidla-perture, a
picture receiving screen, de?ecting means for de
?ecting the cathode ray for scanning said screen,
said de?ecting means being arranged between 10
diameter considerably above 10 millimetres, said
10 plate-shaped electrode having an aperture, the
diameter of which is in the order of ?ve mm., ' said anode and said screen, an electron-optical
, said electrode being adapted to be supplied with a system for reproducing said anode aperture on to
high positive potential, and a second plate-shaped said screen, said electron-optical system including
electrode having a diameter considerably above 10 one plate-shaped electrode being arranged be
15 millimetres, said second plate-shaped electrode tween said anode and said de?ecting means and
having an aperture, the diameter of which is in having an opening the diameter of which is con-,
the order of ?ve mm. and being furnished at its siderably greater than the diameter of said aper
side facing the ?rst said electrode with a metallic ture, said electrode having at its side facing said
cylinder surrounding said aperture, the diameter screen a cylindrical abutment, the diameter of
20 of said cylinder being in the order of» ten mm., which is considerably greater than the diameter 20
said second electrode being adapted to be supplied of said opening and the length of,‘ which is at least
with a positive potential which is lower than the equal to its diameter, said electrode being adapted,
potential, which the ?rst said electrode is to be to be supplied with a positive potential, and a
further plate-shaped electrode having an opening
supplied with, said second electrode being ar
which is nearly equal to the opening of said ?rst 25
25 ranged at a small distance from the ?rst said one,
the edge of said cylinder being spaced from the electrode, said further electrode being adapted to
be supplied with a potential which is higher than
?rst said electrode for about one mm.
4. An electron-optical system for Braun tubes that which the ?rst said electrode is adapted to
comprising three electrodes arranged one after be supplied with, said further electrode being ar
another, the ?rst and the third of said electrodes ranged between said ?rst electrode and the screen, 30
consisting of a plate-shaped element having an
aperture and being adapted to be supplied with a
high positive voltage, the second electrode con
sisting of a plate-shaped element having an aper
ture and being furnished at its side facing said
third electrode with a cylindrical abutment, the
diameter of said abutment being about twice the
diameter of said aperture, said second electrode
being arranged in close proximity to said ?rst
electrode and near said third electrode. the dis
tance between the plate-shaped element of the
second electrode and the ?rst said electrode on
the one hand and the distance between the edge
of said abutment and said third electrode on the
other hand each amounting to approximately one
mm., said second electrode being adapted to be
supplied with a lower positive voltage, the ar
rangement being such that the braking ?eld is
mainly restricted to the space between said sec
ond and said third electrode.
5. A Braun tube for television purposes com
prising an evacuated envelope, a cathode and an
anode arranged in operative relationship thereto,
said anode having an aperture of small diameter,
a‘ picture receiving screen, de?ecting means for
de?ecting the cathode ray for producing a scan
ning of said screen, an electron-optical system for
reproducing said anode aperture on said screen,
said system being arranged between said anode
and said de?ecting plates, and means for parallel
izing the cathode ray between said cathode and
said aperture, said means including at least one
electron-optical collecting lens system and at least
one electron-optical dispersing lens system.
6. A Braun tube for television purposes com
prising an evacuated envelope, a cathode and an
anode arranged in operative relationship thereto,
said anode consisting of a holding plate of good
U thermal conductive material and a small disc con
and a metallic tube having a diameter which is
considerably greater than the diameter of said
opening of said ?rst electrode of‘ said electron
optical system, said tube being arranged between
said anode and said ?rst electrode and being 35
connected to one of these electrodes.
8. Braun tube for television purposes compris
ing an evacuated envelope, a cathode and an
anode arranged in operative relationship thereto,
said anode having an aperture, means for con
centrating the cathode ray intosaid aperature, ,
a picture receiving screen, two pairs of de?ecting
plates, the plates of each pair being inclined
against each other, said de?ecting plates being
arranged between said anode and said screen, an 45
electron-optical system for reproducing said anode
aperture on to said screen, said electron-optical
system including one plate-shaped electrode ar
ranged between said anode and said de?ecting
means and having an opening the diameter of 50
which is considerably greater than the diameter
of said aperture, said electrode having at its side
facing said screen a, cylindrical abutment the
diameter of which is considerably greater than
the diameter of said opening and the length of 55
which is at least equal to its diameter, said elec
trode being adapted to be supplied with a posi
tive potential, and a further plate-shaped elec
trode having an opening which is nearly equal
to the opening of said first electrode, said further 60
electrode being adapted to be supplied with a po
tential which is higher than that which the ?rst
said electrode is adapted to be supplied with, said
further electrode being arranged between said
?rst electrode and the screen, and a metallic tube 65
having a diameter which is considerably greater
than the diameter of said opening of said ?rst
electrode of said electron-optical system, said tube
being arranged between said anode and said ?rst 70
nected to said holding plate, said disc having a
small aperture and consisting of a highly refrac
electrode and being connected to one of these elec
trodes, an auxiliary electrode adapted to be sup
tory material, means‘ for concentrating the
plied with a high positive potential, said auxiliary
electrode being arranged between said de?ecting
plates and said picture receiving screen, and a me
cathoderay on to said aperture, a picture receiv
ing screen, de?ecting means arranged between
27198,886
tallic wall coating commencing near the ?rst elec
trode of said electron-optical system and extend
said electron-optical system and extending for at
' least 8 centimetres in the'direction to the screen.
11. A mun tube. for television purposes com
ing for at least eight cm. in the direction to the
screen.
'
'
'
, ,9. A Braun tube for television
com
prising an evacuated envelope, a cathode and an
I anode arranged in operative relationship thereto,
said anode having an aperture, means for con
‘centrating the cathode ray into said aperture, a
16 picture receiving screen, de?ecting means tor de
?ecting the cathode ray for scanning said screen,
said de?ecting means being arranged between said
anode and said screen, an electron-optical system
prising an evacuated envelope, a cathode, and
an anode arranged in operative relationship
thereto, said anode having an‘ aperture of small
diameter, a picture receiving screen; de?ecting '1
means for de?ecting the cathode ray tor produc
ing ascanning of ‘said screen, and means for '
reproducing said anode aperture on said screen, 10
said means including at least one electron-optical
collecting lens system and at least one electron
ioptical dispersing lens system, said collecting
for reproducing said anode aperture onto said and dispersing lens systems being structurally
15 screen, said electron-optical system including one united to form one single element.
15
12-. A Braun 'tube comprising means ior'pro
plate-shaped electrode being arranged between
said anode and said de?ecting means, and having 'ducing a cathode ray, a diaphragm, a preliminary _
an opening the diameter of which is considerably concentrating system for concentrating the oath
greater than the diameter of said aperture, said ode-ray onto said diaphragm, an image screen,
an electron-‘optical system for reproducing said
20 electrode having at its side facing said screen a
cylindrical abutment, the diameter of which is diaphragm‘ onto said image screen, and means
considerably greater than the ‘diameter of said for deviating the path of ‘the cathode ray be
tween said diaphragm and said electron-optical
opening, said electrode being adapted to be sup
plied }with a positive potential, and a iurther system to ‘increase the path of the cathode ray
25 plate-shaped electrode having an opening which between said diaphragm and said electron-optical 25
is nearly equal to the opening of said ?rst elec
13. A Braun tube comprising ‘means for pro-'
trode, said further electrode being adapted to be
supplied with a. potential which is higher than ducing a cathode ray, a diaphragm, a preliminary
that which the ?rst said electrode is adapted to concentrating system tor concentrating the oath80, be supplied with, said further electrode being ode ray onto said diaphragm, an image screen,
system.
arranged between said ?rst electrode and the
screen, and a metallic tube having a diameter
which is considerably greater than the diameter
of said opening of said ?rst electrode of said
35 electron-optical system, said tube being arranged
40
-
'
an electron-‘optical system for reproducing said
diaphragm onto said image screen, and magnetic
?eld producers for, deviating the path of the
cathode ray between said diaphragm and said
electron-optical system to increase the path of‘
between said anode and said first electrode and
being connected to one of these electrodes.
the cathode ray between saidrdiaphragm and
10. A Braun tube for television purposes com
prising an evacuated envelope, a cathode and an
14. A Braun tube comprising means for pro
ducing a cathode ray, a diaphragm, a'preliminary
concentrating system for concentrating the oath 40
ode ray onto said diaphragm, an image screen,
an electron-optical system for reproducing said
diaphragm onto said image screen, said electron
anode arranged in operative relationship thereto,
saidanode having an aperture, means for con
centrating the cathode ray into said aperture, a
picture receiving screen, two pairs of de?ecting
plates, the plates of each pair being inclined
45
>
against each other, said de?ecting plates being
arranged between said anode and said screen, an
electron-optical system. for reproducing said anode
aperture onto said screen, said electron-optical
system including one plate-shaped electrode ar
50 ranged between said anode and said de?ecting
said electron-optical system.
,
optical system being structurally. united with said
preliminary concentrating system, and means for 45
deviating the path of the cathode ray between
said diaphragm and said electron-optical system
to increase the path of the cathode ray between
said diaphragm and said electron-optical system.‘
15. An electron-optical system for Braun tubes 50
means and having an opening the diameter of ‘comprising a plate-shaped electrode having an
aperture, said electrode being adapted to be sup
plied with a high positive potential, and a second
facing said screen a cylindrical abutment the plate-shaped electrode having an aperture of
55 diameter of which is considerably greater than substantially the same size as the ?rst said aper 55
the diameter of said opening, said electrode being ture, said second plate-shaped electrode being
adapted to be supplied with a positive potential, furnished at its side facing the ?rst said electrode
and a further plate-shaped electrode having an with a metallic cylinder, surrounding said aper
opening which is nearly equal to the opening of ture in the second said electrode, the diameter
60 said ?rst electrode, said further electrode being , of said cylinder being about twice the diameter 60
adapted to be supplied with a potential which is of said apertures, the diameters of said plate
higher than that which the ?rst said electrode is shaped electrodes being substantially larger than
adapted to be supplied with, said further electrode the diameter of said cylinder, said second elec
being arranged between said ?rst electrode and trode being adapted to be supplied with a positive
65 the screen, and a metallic tube having a diameter potential which is lower than the potential which 65
which is considerably greater than the diameter of the ?rst said electrode is to be supplied with.
16. In a Braun tube more particularly for tele
said openingoi said ?rst electrode of said elec
which is considerably greater than the diameter
of said aperture, said electrode having at its side
tron-optical system, said tube being arranged
between said anode and said ?rst electrode and
70 being connected to one of these electrodes, an
auxiliary electrode adapted to be supplied with a
high positive potential, said auxiliary electrode
being arranged between said de?ecting plates and
said picture receiving screen, and a metallic wall
75 coating commencing near the ?rst electrode of
vision purpcses in combination with a diaphragm
having an aperture, with means including a
cathode for producing a bundle of cathode ray 70
to illuminate said aperture with cathode ‘rays,
with a picture receiving screen, and with means
for electron-optically reproducing said aperture
on said screen: a preliminary- cathode ray con
centrating system mounted between said cathode 75
2,128,280
"
‘?
and said diaphragm for concentrating said bundle
said cathode; said cylindrical electrode being
onto said aperture, and comprising‘ at least one
plate-shaped electrode and a cylindrical electrode
adapted to be maintained po?tive in relation
to said cathode but negative in relation to said
mounted between said plate-shaped electrode and
said diaphragm, said plate-shaped electrode being
adapted to be maintained positive in relation to
plate-shaped electrode.
'
‘KURT SCHLESINGER.
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 200 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа