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Патент USA US2133123

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Oct. 11, 1938.
K. 'rll-IANYI
2,133,123
TELEVISlON APPARATUS
Original Filed June 10, 1929
1<1
INVENTOR
LMAN a IHANYI
ATTORNEY
_ 2,133,123
Patented Oct. 11, 1938
UNITEDÍSTATES PATENT oFFlcl-z
2,133,123
TELEVISION
I
I
Kalman Tihanyl, Budapeshllungary, Vassigner’
to Radio Corporation of America, a corporation .
y
of Delaware`
Original >application "June
1o, ,1929, serial No.
369,598. Di'vided‘and this application March 8,
1935, Serial No. 9,959. In Germany June 1l,
1928
s claims. (ci. 11s-1.5i
i The present invention relates` to television ap
paratus, and is particularly directed to the re
ceiver end of the system. This application forms
Va’clivìsional part of my copendinggapplication~
5 . Serial No. 369,598, iiled June 10, 1929, for an in
vention entitled Television apparatus.
` tube, there is developed between a cathode ‘I and
an anode 9 anvelectron beam conventionally des
ignated II whose intensity is controlled in ac
cordance with the strength of the received signal
applied to the control gridA 3. At the opposite
end of the tube 5. there is provided a iluorescent ,
It is one of the primary objects of the present screen structure i3, and intermediate this screen
structure and the point at which the electron
invention to eliminate many of the dimculties - beam
II is developed, there is provided a source
which arise in connection with the- methods of
of _electrons which is provided by means- of a
reproducing television images as heretofore’prac
ticed in the -art, with particular reference being _series of cathode wires or some other appropriate
emitter I5. The electrons emitted from the
had to the diñiculties which have arisen in con
source
I5 tendto ñow toward the screen struc
nection with the so-called mechanical types of
television apparatus such, for example, as the ture I3 by reason of the voltage difference main
Nipkow disc. Also in the prior art, so far as I tained between the emitter _I5 and the screen I3
by the battery I1 so that in the absence of any
am aware, diñiculties, havefrequently arisen due
to the fact that it has been substantially impos- - cathode ray II developed within the tube, there
will be substantially constant intensity light pro
sible to cause the produced electro-optical ef
fccts to persist for any appreciable length of duced upon the fluorescent screen structure. In
termediate the emitting surface I5 and the screen
time. Therefore, in accordance with my pres
I3 there is provided a grid-like structure I9
ent invention recourse is had to systems wherein
which,
for example, may be of the form shown
special means are provided for intensifying the
picture resulting in. the receiving tube of the by Fig. 4 so arranged the grid structure I9 com
system assuming the invention to be applied to prises an internal conducting member 2i about
which is a layer of insulating material 23 extend
the so-called cathode ray type of .image repro
ing throughout the entire length of the con
2 5' ducer. To this end the system is so designed and
developed that there is produced in the receiver ductor. Covering the insulator 23 and spaced
tube the effect of storage of the image producing apart from each other are a plurality of electri
isolated photoelectric areas 25. With the
signals so that the electro-optical eiîects which cally
arrangement as described, the electron beam Il
result are maintained substantially throughout
the entire scansion cycle.
’
Other objects and advantages of the' invention
are to provide improved television reproducing
apparatus which will be eflicient in its operation,
Q3 Cil
and easy to control.
,
«
Still otherobjects and advantages will be ap
parent to those skilled in the art by a reading of
the following specification and claims taken ,in
connection with the accompanying drawing
40 wherein:
Fig. 1 discloses an arrangement wherein a grid
like struc’fure is combined with an electrode for
emitting electrons to control the brilliance of the
- _
fluorescent effects resulting; .
Fig. 2 shows a modification of the arrangement
of Fig. 1;
v
.
'
Fig. 3 illustrates a still further modiiication;
and
-
,
'
~
Fig. 4 shows, for example. one form ofgrid
structure
which'might be used in connection with
Cl O
the apparatus disclosed by Fig. 1 although other
forms of grid structure could be substituted.
In making reference to the accompanying
drawing, image signals transmitted by any de
Ui UI sired Atype of transmitting apparatus such, for
example, as that shown in my parent application
Serial No. 369,598 above referred to, are _suitably
received in a receiving device I and are supplied
to the control electrode system 3 of a cathode ray
l60 tube conventionally designated 5. Within this
developed within the tube passes through the
10
15
20
25
‘ 30
emitter element I5 so as to impinge upon the
photoelectric surface 25 and the associated in
sulator 23 in the area intermediate the inde
pendent photoelectric areas. When this hap 35
pens, itis believed that the positive charge which
the photoelectric areas acquire due to the illumi
nation of the screen structure I3 as produced by
Vthe electrons from the source I5 impinging upon
the same will be neutralized, and thus the in--
tensity of the fluorescent effect resulting will be
modiñed. The charge produced by virtue of the
impact of the beam electrons as controlled in in
tensity by the signal applied to the control grid 3
will vary the intensity of illumination upon the 45
screen structure I3 so that it is proportional to
the signal received. This intensity of fluorescent
eiïect will continue during the time interval be
tween successive scansions by the beam.
’
The scanning action takes place by virtue of 50
any s 'table controlling voltages applied to the
deilecting systems 21 and 29 which, itv may be
assumed, are in synchronism with similar con
trolling voltages at the transmitter end of they
system, and thus the developed cathode ray beam 55
is caused to scan each elemental area of the
structure 2|, 23, 25 at a predetermined rate.
In the modiñed form of arrangement as dis
closed, for example, in Fig. 2, there is arranged
intermediate the screen structure I3 and the 60
2,
2,138,123
electron beam developing arrangement compris
ing the cathode 1 and the anode 9, two additional
Ato fluorescé underv electronicl bombardment, a y
electrodes which comprise cathode wires. such as _
source of electrons substantially adjacent the
that shown at 3| and a photoelectric layer such
as that shown at 33. The layeror gridl 33 with
ate the electron source and the screen, means to
its electric ñeld elements inñuencing the inten
screen structure, a control electrode intermedi
produce> a cathode ray bean-i and to` control the
intensity thereof in accordance with received
sity of the electron current from the cathode
Y
. image signals,'and_ means for >causing the in
wires 3l in a manner substantially similar to
that oi’ the ordinary type of two-plate valve in tensity controlled cathode ray beam to scan the
v10 which the cathode is between an anode andan
opposite electrode. The grid-like structure 33
and the electrode 3| may also be arranged be
hind the screen where desired. Any negative
charges on the photoelectric grid 33 must be
15 removed or neutralized after the conductor has
been’ transmitted, and‘this may be done by iri
dation with homogeneous light, for example, as
indicated conventionally -by means of the in
falling light rays designated as 35, and the photo
said control electrode to produce ateach ele
mental area thereof during scansion an electro
static charge to modify the illumination intensity
10
normally produced at the screen structure.
3. In a cathode ray beam comprising an evacu
ated envelope containing a screen structure>
adapted to .fiuoresce under electronic bombard 15
ment, a homogeneous source of electrons sub
stantially adjacent the screen structure, a control
electrode intermediate the electron source of the
screen structure, said control electrode compris
ing a network of electrically conducting strands 20
the entire grid to be charged to a positive ten
sion, for example, the limit tension, and is then having insulating material surrounding each, and
ready for the next operation or, in other words, a plurality of separated light sensitive elemental
the next cycle of scansion, and the electrodes areas supported upon the insulators, means to
25 released by the homogeneous light beams may . produce a cathode ray `beam and to control the
be accumulated in any positive portion of the intensity thereof in accordance with received 26
image signals, and means for causing the in
tube, for example, the screen structure itself.
A still further modiñcation of the arrangement, iensity controlled cathode ray beam to scan said
as disclosed by Fig. 3, a cathode is shown at the control electrode to produce at each said light
30 rear of the fluorescent screen I3. In this show
sensitive elemental area thereof during scansion
ing, 31 represents an insulated plate on the front an electrostatic charge to modify the illumina 80
tion intensity normally produced on said screen
face of which layers of photo-sensitive material structure.
39, as described above, are provided. Opposite
4. In an electron tube of the cathode ray type
the layers of photo-sensitive material 39 are
35 .similar layers @l which are arranged on the face including an evacuated envelope, a cathode at
one end thereof. and an anode to which appro 85
of the plate 31 which is not struck by the devel
oped cathode ray beam il. The screen structure priate voltages are adapted to be applied so as
I3 with its phosphorescent layer is arranged on to develope an electron beam, an image carrier
the rear face of the system, and electrodes which in the opposite end of the envelope, said image
radiate electric particles, such as the cathode carrier comprising a network of electrically con
ducting strands having insulated material sur
" element d3, may be arranged at the rear of the
rounding each, a plurality of separated light`
system. The cathode wires are preferably made
from a metal having a low cathode drop, and the sensitive elemental areas supported upon the in
sulators, a fluorescent screen positioned adjacent
tube is ñlled with a rare gas, such as argon, for
20 electric effect which is released thereby will cause
example, at low pressure. The wires may also be
of oxide in red hot condition, and may be coated,
for example, with barium oxide. As described in
connection with the description of Fig. 3, homo
geneous light from a suitable source 35 may be
50 arranged to neutralize the charges at the com
pletion of each cycle of scansion.
While the invention. has been illustrated in
several of its preferred forms it will, of course,
be apparent that many additional modifications
may be made without departing from the spirit
and scope of the aforegoing disclosure.
Having now described one form of the inven
tion and the manner in which it is believed the
same may be operated, what is claimed and
60 desired to secure by Letters Patent is the follow
ing:
'
'
`
1. In a television apparatus, a cathode ray
tube having means at one end thereof to develop
an electron beam, an image carrier at the other
65 end of the tube, said image carrier comprising a
network of electrically conducting strands having
insulating material surrounding each, a plurality
of separated light sensitive areas supported upon
the insulators, a fiuorescent screen and a source
70 _of electrons each positioned adjacent said image
carrier, and on opposite sides thereof.
2. A cathode ray tube comprising an evacuated
envelope containing a screen structure adapted
to and on one side of said image carrier, and a
source of electrons positioned on the other side
65
of said image carrier.
5. An electron tube of the cathode ray type
including an evacuated envelope. a cathode at
one end thereof and an anode to which appro
priate voltages are adapted to be applied so as to
develop an electron beam, a fluorescent screen
structure adapted to fluoresce under electronic
bombardment positioned in the opposite end of.
the evacuated envelope, a source of electrons sub
stantially adjacent said screen structure, a con 55
trol electrode adapted to control the flow of
electrons from said source to said screen struc
ture, said control electrode comprising a plurality
of electrically conducting strands having insu
lating material surrounding each, and a plurality
of separated elemental light sensitive areas sup
ported upon the insulators, means for controlling
the intensity of the devloped electron beam in'
accordance Wtih received image signals, and
means for causing the intensity. controlled elec
tron beam to scan the said screen structure and
a control electrode to produce at each elementalv
area of said control electrode during scansion
an electrostatic charge to modify the illumina
tion`intensity normally produced _at said screen
structure.
TIHANYI.
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