close

Вход

Забыли?

вход по аккаунту

?

код для вставки
Dec. s, 1946.
c, E, HALLMARK
2,412,086
IMAGE DIS’SECTOR TUBE
Filed Aug. 26, 1944
24
ELD FR
SCAN. GEN.
LINE FRE
SCANNING
FREOUEN
SCANNING
GENERATOR
GENERATOR .
LINE FREQ.
SCAN.
24
34
2o
/
I
as
s?
3EE11 _
F|G.2
I
CLYDE E. HALLMARK
FIELD FR‘EQUENCY
l
,
35
24
INVENTOR
SCANNING
GENEQRATOR
1
AM“.
Patented Dec. 3, 1946
UNITE
2,412,086
STATES
2,412,086
IMAGE DISSECTOR TUBE
Clyde E. Hallmark, Fort Wayne, Ind., assignor to’
Farnsworth Television and Radio Corporation,
a corporation of Delaware
Application August 26, 1944, Serial No. 551,297 "
1': Claims.
1
2
This invention relates generally to television
systems and particularly to picture signal gen
erating tubes.
(Cl. 178—7.2)
_
the anode. This electrical aperture associated
with the anode does not form part of the conven
tional electron de?ecting means provided for ef
fecting deflection of the electric image in accord
Conventional image dissector tubes comprise
a photosensitive cathode upon which the light 5 ance with the scanning pattern and, therefore,
image to be transmitted is projected. The light
two separate electric or magnetic ?elds must be
causes photoelectrons to be emitted by the photo
created in the tube and controlled or adjusted
separately,
sensitive cathode representative of the light
image, and the resulting stream of photoelec
The primary object of the present invention,
trons is directed towards a collecting anode. - In
therefore, is to provide a \picture signal gen
order to e?iect scansion of the stream of photo
erating tube where an electron image representa
electrons, electromagnetic de?ecting means have
tive of the light image to be transmitted is de
usually been provided.
By means of this ar
?ected in such a manner that at any instant
rangement the stream of photoelectrons is bodily
electrons from only a selected incremental area
de?ected in accordance with a predetermined 15 of the cathode will reach the collector anode,
scanning pattern. An aperture provided in a
while electrons from other areas of the cathode
shield surrounding the collector anode de?nes
are dispersed away from the collector anode.
the size of the elemental area of the photoelectric
Another object of this invention is to provide
novel means in a picture signal generating tube
anode at any particular instant. The magnetic 20 for electron-optically controlling the size of the
?eld created in the dissector tube varies for
incremental area of the cathode from which at
de?ecting the photoelectron stream according to
any instant electrons are able to reach the col
lector anode.
the scanning pattern. In this manner, succes
sive areas of the cathode are scanned to provide
In accordance with the present invention, there
for a complete scansion thereof.
25 is provided a television picture signal generating
device comprising a photoelectric cathode for
It has also been proposed to utilize electro
creating an electron image when a light image
static ?elds for e?ecting de?ection of the elec
trons in accordance with a scanning pattern.
is projected thereon. Electron de?ecting means
are arranged adjacent the path of the electron
Also in this case the stream of photoelectrons
representing the image to be transmitted is bodily 30 image created by the photoelectric cathode for
dispersing and attracting electrons from all but
de?ected, and hence substantially all photoelec
trons are simultaneously directed towards the
one of the incremental areas of the electron
collector anode, necessitating the use of an aper
image. A collector electrode is disposed to re
ture arranged in a shield surrounding the col
ceive only electrons from that one incremental
area of the electron image.
lector anode to de?ne the size of the individual
picture elements.
In another embodiment of the invention, the
photoelectric cathode is arranged at one end of
In many cases it is desirable to control the
an evacuated envelope while the light image to
size of the scanning aperture. However, with
be transmitted is projected through the other
the conventional image dissector tube this can a
not be done without taking the tube apart. To 40 end of the envelope. The electron image emitted
overcome this drawback, an electrical aperture
by the cathode is accelerated by an electrode,
and two pairs of de?ecting plates are arranged
has been suggested where the effective size of
so as not to interfere with the light projected
the elemental area of the cathode scanned at
any instant is varied by electron-optical means.
toward the cathode. The collector anode posi
To this end it has been proposed to utilize an
tioned in the envelope is also arranged so as not
anode structure including a number of apertured
to interfere with the light. The two pairs of
plates which are supplied with suitable electric
plates are operatively connected with de?ection
potentials for varying the electric ?eld strength
control means for applying a variable electric
between the plates, thereby to de?ect and return
potential to said plates for creating a variable
a larger or smaller number of electrons and thus 50 divergent electric ?eld pattern to select electrons
control the size of the electron pencil passing
from successive incremental areas of the elec
through the apertured anode structure. How
tron image in accordance with a predetermined
ever, also in this case the collector anode has to
scanning pattern and to pass the selected elec
be provided with a shield for preventing the
trons between the two pairs of plates while de
unselected or undesired electrons from reaching 55 ?ecting and dispersing substantially all other
cathode from which electrons reach the collector
2,412,086
3
electrons toward the plates. A constant electron
de?ecting field is provided for directing the se
lected electrons toward the anode.
This arrangement is particularly advantageous
because the collecting anode may be positioned
at any convenient place while the selected elec
trons can be deflected toward the anode. This
is made possible because at any instant all un
4
collector anode ‘I is kept at a slightly higher pos
itive potential than plates l0 and I I.
Each set of plates I0 and II is supplied with a
voltage alternating in accordance with a prede
termined scanning pattern. To this end a ?eld
frequency scanning generator 24 is connected
to leads 20, 20 and hence to plates I0, Ill. The
generator 24 supplies a voltage to plates I0, l0
selected electrons are dispersed and de?ected
alternating according to the ?eld scanning fre
away from the collector anode and preferably 1O quency. Plates II are supplied with the line
are collected by the electrostatic plates so that
scanning frequency from a line frequency scan
only selected electrons pass between the electro
ning generator 25 through leads 23, 23. It will
static plates. These selected electrons can then
be understood that the operation of the picture
be de?ected in any desired direction Without in
signal generating tube embodying the invention
terference from the dispersed electrons.
is not dependent upon which of plates III or II
For a better understanding of the invention,
is supplied with the line scanning frequency and
together with other and further objects thereof,
the ?eld scanning frequency. When plates I 0
reference is made to the following description,
and II are spaced longitudinally from each other
taken in connection with the accompanying
as shown in Fig. 1, their electric ?elds will not
drawing, and its scope will be pointed out in 20 disturb each other.
the appended claims.
,
I
A magnetic focusing coil 30 is arranged outside
In the accompanying drawing:
the envelope I and supplied with energy from
Fig. 1 is a schematic diagram of a picture sig
a source of potential such, for example, as bat
nal generating tube embodying the present in
tery 3|. This coil generates a constant magnetic
vention and connected in circuit'for generation 2.5 ?eld for focusing the selected electrons upon the
of television signals;
' collector anode 1.
Fig. 2 is a schematic representation of electric
Referring now to the operation of the picture
lines of force which are created at. a particular '
signal generating tube illustrated in Fig. 1, an
moment in the tube of the invention; and
optical image of the scene or object 4 is pro
Fig. 3 is a schematic diagram of a modi?ed 30 jected on the cathode 3 by the optical system 5.
tube in accordance with the present invention.
Through the action of the light on the photo
Referring now more particularly to Fig. 1, there
sensitive surface 3, photoelectrons are emitted to
is provided a picture signal generating tube hav
form an electron image which moves under the
ing an evacuated envelope I including a plane
in?uence of the ?eld generated by the acceler
optical window 2. A photoelectric cathode 3 is 35 ating electrode 8 towards the collector anode ‘I.
positioned in the envelope I adjacent the win
The geometric arrangement of the accelerating
dow 2. An optical image or scene represented
electrode 8 and the electrostatic de?ecting plates
by an arrow 4 is focused on the photoelectric
III and II is such that the electric ?elds created
cathode 3 by an optical lens system 5. The photo
by the voltages supplied to the accelerating elec
electric cathode 3 is transparent or transluscent 40 trode 8 and plates III and II are divergent. Ac
and bears a photosensitive layer 6 on its surface
facing a collector anode-1. The collector anode
cordingly, the photoelectrons emitted by the
photoelectric cathode 3 are subjected to this di
‘I is positioned at the other end of the envelope
vergent electrostatic ?eld.
I and arranged to receive selected photoelectrons
The action of this divergent ?eld can best be
from the cathode 3. An accelerating electrode 8 ' explained'by reference to Fig. 2. In Fig. 2 elec
is arranged adjacent thecathode 3 and is pref
trostatic plates 33 and 34 corresponding, for ex—
erably of cylindrical shape. Two pairs of electro
ample, to plates III, II) of Fig, 1 have been shown
static de?ecting plates III, II) and II, I I are pro
connected by. leads 20,- 20 t0 the ?eld frequency
vided in the envelope I between the accelerating
scanning generator 24. The connection of the
electrode 8 and the collector anode 1. Plates I0 50 resistori 8 to the battery I2 has'been indicated
and II are positioned. at right angles "to each
schematically. The accelerating electrode 8 has
other. Preferably, plates I0 and II are'displaced
been replaced by an equivalent screen 35 to sim
longitudinally from each other.
’ '~
'
plify the following explanation.
Actually the
The photoelectric cathode 3 is connected with ' {electric lines of force created by a‘ cylindrical
the negative terminal of a source of potential 55 ‘accelerating electrode are not straight but slightly
such, for example, as a battery I2 through a lead
I3.‘ A lead I4 connected to the battery I2 as
shown keeps the accelerating electrode 8 at a
positive potential with respect to the cathode 3.
The positive terminal of the battery I2 is ground
ed and connected to the collector anode ‘I through
a lead I5 and an output resistor I6.
Electrostatic de?ecting plates I0 and II are
supplied with a positive potential with respect to
the cathode 3. To this end a lead I'I connects
the battery I 2 as shown with an adjustable slider
contact of a resistor I8. The two terminals of
the resistor I8 are connected through leads 20, 20
curved and, therefore, a screen has been sub
stituted in Fig. 2 which createsstraight electric
lines of force. We may assume that the screen 35
has applied thereto an accelerating potential of 50
60 volts while the potential supplied to plates 33, 34
> from the battery I2 may, for instance, be 250
volts. IAll voltages are referred to the same ref
erence potential and are given here with respect
to the photoelectric cathode 3. The constant po
tential supplied to plates 33, 34 should be such
that at no time either of the plates 33 or 34 has
a lower potential than the screen 35. By means
of the generator 24 a variable voltage is supplied
to plates 33, 34. At a particular moment the plate
with plates ID, ID. Similarly plates II, II are
kept at the same potential as plates III, III through 70 34 may have applied thereto a potential of 60 '
volts and the plate 33 a potential of 440 volts.
a lead 2| connected to the lead I‘! and to an ad
These voltages result from the generator 24 add
.iustable slider contact of a resistor 22, the ter
ing 190 volts to the voltage supplied from the bat
minals of which are connected to plates II,_ II
tery to the plate 33 and subtracting 190 volts from
through leads 23, 23. It will be 'seen that the 75 the voltage supplied from the battery to the plate
2,412,086
34. The electric lines of force 36 produced by
which electrons reach the collector anode 1 is
such an electric ?eld have been shown schemati
cally in Fig. 2. It will be seen that most of the
electric lines of force are bent toward the plate
33 while a few are de?ected toward the plate 34 5
thus adjusted or controlled through the electron >
de?ecting means. No mechanical aperture is pro
vided, and the e?ective size of the aperture is de
?ned solely by electrical ?elds created by the po
tentials supplied to the accelerating electrode 8
resulting from the weaker electric ?eld between
the screen 35 and the plate 34. Between the two
and plates 10, II.
opposed electric ?elds there is a neutral zone and -
one electric line of force indicated at 31 is sub
stantially unde?ected.
The photoelectrons emitted from the surface 6
of the cathode 3 have a tendency to follow the
electric lines of force 36 illustrated in Fig. 2.
Therefore, with respect to'electrode iii, the paths
I
The electric ?elds between plates [0 and II
tvary constantly in accordance with the ?eld and
10 line scanning patterns. Therefore, at any par
ticular instant electrons emitted from a different
incremental area of the cathode 3 are able to
pass between plates I 0, l0 and II, II because
the electric lines of force change their direction
of the electrons substantially follow curves 38 15 all the time as illustrated in Fig. 2. Thus all .
shown in Fig. 1. Hence, it will be evident that at
portions of cathode 3 are scanned successively.
any particular moment most photoelectrons emit
Those electrons which have been selected at any
ted from the cathode 3 and comprising the elec
particular instant are able to pass between both
tron image will be dispersed and de?ected away
plates l0 and II and will ?nally reach the col- from a straight path and substantially all of these 20 lector anode ‘l. A‘television signal train is thus
electrons will be de?ected toward plates I0 as il
developed across the output resistor 16, and the
lustrated in Fig. 1. However, at any instant, elec
signal may be taken from the output terminal
trons from a certain selected horizontal line area
42. The output signal may be ampli?ed in any
of the electron image will pass between plates I0,
desired and conventional manner. It is also fea
I ll substantially unde?ected.
25 sible to combine the collector anode with a con
Fig. 2 is also~illustrative of the ?elds of force
ventional electron multiplier, such as will be de
generated between plates H, H except that the
scribed hereinafter, in connection with Fig. 3. .
potentials on these plates vary at the line scanning
The magnetic coil 30 generates a constant mag
' rate. Thus, at any particular instant, most of the
netic ?eld for focusing the selected electrons
photoelectrons passing out of the ?eld of plates 30 upon the collector anode 1. However, it will be
l0, [0 into the ?eld of plates H, H are dispersed
appreciated that no sharp focusing of the se
and deflected away from a straight path under
lected electrons is necessary as long as substan
the in?uence of lines of force similar to those in
tially all selected electrons reach the collector
dicated in Fig. 2. However, electrons from a cer
anode ‘I. In some cases it may be desirable to
tain selected area pass between plates l l substan 35 dispense with the focusing coil 30.
tially unde?ected whereby at any instant, elec
Referring now to Fig. 3, in which like compo
trons from only certain incremental areas of the
nents are designated by the same reference nu
electron image will pass between plates l0, l0 and
merals as were used in Fig. 1, it will be seen that
H, H while substantially all other electrons will
the accelerating electrode 8 and de?ecting plates
be de?ected toward plates 10, Ill and II, II to be
10 and II are the same in Fig. 3>as in Fig. 1.
eventually collected thereby.
Fig. 3 di?ers from Fig. 1 by the arrangement of
The effective size of the aperture, that is, the
the light projecting means with respect to cath
size of the elemental area of the cathode 3 from
ode 45. The cathode 45 is arranged at one end
which electrons reach the anode 1 at any in
of the evacuated envelope l which is provided
stant depends upon the electric ?elds created by
at its opposite end with a plane optical window
the various electrodes in the envelope I, More
46. A light image of the scene 4 is projected by
particularly the e?ective size of the aperture is
the optical lens system 5 on the cathode 45
inversely proportional to the ratio of the mean
through the window 46. The optical path of the
voltage applied to electrostatic de?ecting plates
light has been shown diagrammatically only due
l0 and l l and the unidirectional voltage applied to 50 to the limited space of the drawing. The photo
the accelerating electrode 8. The mean voltage
electric cathode 45 has its photo-sensitive layer
applied to de?ecting plates in and II, averaged
opposite the window 46, and hence it will be seen
over a scanning cycle, is equal to the voltage sup
that the cathode 45 need not be transparent.
plied from the source 12 through leads 20 and 23
The cathode 45 and the accelerating electrode
to plates l0 and II, respectively. When this ratio 55 8 are connected with the battery 12 in the man
becomes larger, that is, when for instance the
ner described in connection with Fig. 1. Simi
voltage applied to the accelerating electrode 8 is
larly the electrical potentials applied to plates I0
decreased, the effective size of the aperture is re
duced. This can be explained in the following
and II are connected in the same way as in Fig. 1,
and hence need not be described here. The mag
manner. By decreasing the voltage applied to 60 netic focusing coil 30 connected to the battery 3!
the accelerating electrode 8, the speed of the elec
is provided outside the envelope I for creating a
trons is reduced and therefore they can be de
constant magnetic ?eld which serves for focusing
?ected more easily. This can be accomplished by
the selected electrons.
adjusting the tap connecting the battery [2 ‘to the
A collector anode or target 41 is associated with
lead l4. The same effect can also be obtained by 65 an electron multiplier 52 including a number of
keeping the voltage on the accelerating electrode
secondary-electron-emitting electrodes 53. The
8 constant and increasing the mean voltage ap
target 41 is connected‘ to the battery I! through
plied to plates l0 and l I. This adjustment is ef
a lead 48 and is kept at a higher positive poten
fected through the tap connecting the battery l2
tial than plates l6 and H. A voltage divider 50 ‘
to the lead l1. This also decreases the effective 70 is connected to the battery l2 by leads 48 and .
size of the aperture because now the de?ecting
5|. ‘The lead 5| ‘connects the positive terminal
?elds become stronger resulting in a de?ection of
of battery l2 to ground as shown. The second
ary-electron-emitting electrodes 53 receive their
more electrons than previously.
potentials from taps on the voltage divider 50.
The effective size of the aperture, that is, the
size of the elemental area of the cathode from 75 -An electron collector 54 collects the multiplied
‘9,418,086
electron current and is connected with the out
put terminal 42. The output signal is developed
across the grounded output resistor IS in the
same manner as explained in connection with
Fig. l.
A pair of magnetic de?ecting coils, one or which
is indicated at 55, is arranged parallel to the
plane passing through the cathode 45 and the
8
jected thereon, means including a device for de
veloping a cyclically varying divergent electro
static ?eld to disperse the electrons of said image
in predetermined divergent paths to select elec
trons in a predetermined incremental area there
of and a collector electrode for collecting said se- _
‘ lected electrons from said predetermined incre
mental area oi said electron image.
collector anode or target 41. Magnetic de?ect
2. A television picture signal generating device
ing coils 65 are supplied with energy from a bat 10 comprising a photoelectric cathode for emitting
tery 56 and generate a transverse magnetic ?eld
an electron image when a light image is project
in envelope I.
The picture signal generating tube illustrated
ed thereon, electron de?ecting and collecting
41, there are provided magnetic‘de?ecting coils‘ ‘
tron image.
means extending along the path of electron emis.
in Fig. 3 operates essentially in the same manner
-sion from said cathode for de?ecting the elec
as the tube of, the invention shown in Fig. l. 15 trons of said electron image in predetermined
The light image projected on the photoelectric
divergent paths and collecting electrons from all
cathode 45 through the lens 5 causes a stream
but successively selected incremental areas of
of photoelectrons to ‘be emitted which is accel
said electron image and a collector electrode for
erated by the electrode 8. This stream of photo~
collecting electrons from said successively select
electrons constitutes an electron image. Plates 20 ed incremental areas of said electron image.
I0 and H create divergent electrostatic ?elds for
3. A television picture signal generating device
selecting electrons from predetermined elemen
comprising a photoelectric cathode for emitting
_ tal areas of the electron image in the manner
an electron image when a light image is projected
described hereinabove. The electrons selected at
thereon, unitary electron de?ecting and collect
any particular instant pass between plates l8 25 ing means arranged adjacent the path of elec
and I I and are then focused by the magnetic coil
tron emission from said cathode for de?ecting
so which generates aconstant magnetic focusing
said electron image and collecting at any one in
?eld.
stant electrons from all but a selected one of the
These selected electrons would ordinarily hit
incremental areas of said electron image and a
the window 46 instead of the target 41. In order 30 collector electrode disposed to collect electrons
to direct the selected electrons toward the target
from said selected incremental area of said elec
55 which create a transverse magnetic ?eld.
The
path of the selected electrons is shown diagram
matically by curve 58.
These selected electrons -
4. A television picture signal generating device
comprising an evacuated envelope including a
photoelectric cathode for emitting an electron
which hit the target 41 are then multiplied by
image when a light image is projected thereon,
the electron multiplier 52, and a train of tele
electron de?ecting means arranged in said enve
vision signals is derived from the electron col
lope adjacent the path of electron emission from
lector 54. The television picture signals are im
said cathode, means for applying a variable elec
pressed across the output resistor IB, and the 40 tric potential to said de?ecting means for creat
output signal is obtained through the output ter
ing a variable divergent electric ?eld pattern to
minal 42.
select electrons from successive areas of said elec
By means of this arrangement it is possible to
tron image in accordance with a predetermined
project the light image between plates II and I0
scanning pattern and to pass said selected elec
and through the cylindrical accelerating elec
trons between said de?ecting means while dis—
trode 8 onto the photoelectric cathode 45. A pic
persing substantially all other electrons toward
ture signal generating tube of this type is some
said de?ecting means and a collector anode dis
times more advantageous than the one shown in
posed in said envelope to receive the electrons
Fig. 1 because it is not necessary to use a trans
passed by said de?ecting means.
parent or translucent photoelectric cathode. The
5. A television picture signal generating device
target 41 and its associated electron multiplier 52
comprising an evacuated envelope including a
may be arranged at any convenient place out of
photoelectric cathode for emitting an electron
the path of the light projected toward the photo
image when a light image is projected thereon,
' electric cathode 45. The selected electrons can _
two pairs of plates arranged in said envelope ad
be de?ected toward the target 41 by magnetic de
jacent the path of electron emission from said
?eeting coils 55 or by a suitable electrostatic ?eld.
cathode, means for applying a variable electric
This de?ection of the electrons from the selected
potential to said plates for creating a variable
elemental areas of the cathode is made possible
divergent electric ?eld pattern to successively sc
because substantially all undesired electrons are
lect electrons from elemental areas of said elec
dispersed toward plates It or II and, therefore, 60 tron image in accordance with a predetermined
only selected electrons are able to pass between
scanning pattern and to pass said selected elec
plates ll.
'
trons between said plates while de?ecting sub
While there has been described what are at
stantially all other electrons toward said plates.
present considered the preferred embodiments of
and a collector anode disposed in said envelope
the invention, it will be obvious to those skilled 65 to receive the electrons passed between said
in the art that various changes and modi?cations
plates, thereby to provide for a complete scansion
may be made therein without departing from the
of said electron image in accordance with said
invention, and it is, therefore, aimed in the ap
scanning pattern.
pended claims to cover all such changes and
6. A television picture signal generating device
modi?cations as fall within the true spirit and 70 comprising an evacuated envelope including a
scope of the invention.
photoelectric cathode for emitting an electron
What is claimed is:
image when a light image is projected thereon,
1. A television picture signal generating device
an electrode for accelerating said electron stream
comprising a photoelectric cathode for emitting
arranged adjacent said cathode, electron de?ect
an electron image when a light image is pro 75 ing and collecting means arranged in said enve
2,412,086
9
id
lope adjacent the path of electron emission from
said cathode, means‘i'or applying a variable elec
tric potential to said de?ecting means for creat
?eeting elements positioned in said envelope be
tween said cathode and said collector anode, and
‘ ing a variable divergent electric ?eld pattern be
tween said electrode and said de?ecting means to
select electrons from‘ successive elemental areas
of said electron image in accordance with a pre
determined scanning pattern and to pass said
means for applying a variable potential to said
elements for creating a variable divergent elec
tric ?eld pattern to select electrons from succes
sive elemental areas of said electron image in ac
cordance with a predetermined scanning pattern
and to pass said selected electrons between said
de?ecting elements while de?ecting substantially
selected electrons while dispersing substantially
all other electrons toward said de?ecting means, 10 all other electrons toward said de?ecting ele
ments, thereby to provide for a complete scansion
a collector anode disposed in said envelope to re
of said electron image in accordance with said
ceive the electrons passed by said de?ecting
scanning pattern.
means, and means for varying the strength of the
10. A television picture signal generating tube
electric ?eld between said electrode and said de
comprising an evacuated envelope including a
?ecting means for controlling the size of said suc
photoelectric cathode arranged at one end of said
cessive elemental areas, thereby to control the
envelope, means for projecting a light image
e?ective size of the scanning aperture.
through the other end of said envelope toward
7. A television picture signal generating device
said cathode to produce an electron image, de
comprising an evacuated envelope including a
photoelectric cathode for emitting an electron 20 fleeting means arranged so as not to interfere
with the light projected toward said cathode, a
image when a light image is projected thereon,
collector anode positioned in said envelope and
an electrode for accelerating said electron stream
arranged so as not to interfere with said light,
arranged adjacent said cathode, two pairs of
control means operatively connected with said
plates arranged in said envelope adjacent the
de?ecting means for applying a variable electric
path of electron emission from said cathode,
potential thereto for creating a variable divergent
means for applying a variable electric potential
electric ?eld pattern to select electrons from suc
to said plates for creating a variable divergent
cessive elemental areas of said electron image in
electric ?eld pattern between said electrode and
accordance with a predetermined scanning pat
said plates to select electrons from successive
elemental areas of said electron image in accord 30 tern and to pass said selected electrons while de
?ecting substantially all other electrons toward
ance with a predetermined scanning pattern and
said de?ecting means to provide for a complete
to pass said selected electrons between said plates
scansion of said electron image, and means for
while de?ecting and collectingsubstantially all
creating a constant electron de?ecting ?eld to
other electrons to provide for a complete scansion
direct said selected electrons toward said anode.
of said electron image, a collector anode disposed
11. A television picture signal generating tube
in said envelope to receive the electrons passed
comprising an evacuated transparent envelope
between said plates, and a device for adjusting
including a photoelectric cathode arranged at one
the strength of the electric ?eld between said
end of saidenvelope, means for projecting a light
electrode and said plates for controlling the size
image through the other end of said envelope to
of said successive elemental areas, thereby to con
ward said cathode to produce an electron image,
trol the e?ective size of the scanning aperture.
two pairs of plates arranged in said envelope so
8. A television picture signal generating tube
as not to interfere with the light projected toward
comprising an evacuated envelope including a
said cathode, a collector anode positioned in said
photoelectric cathode for producing an electron
envelope and arranged so as not to interfere with
image when a light image is projected thereon,
said light, an electrode for accelerating said elec
an electrode for accelerating said electron stream
tron stream arranged adjacent said cathode,
arranged adjacent said cathode, means for sup
means for supplying a constant voltage to said
plying a constant voltage to said electrode, two
electrode, deflection control means operatively
pairs of plates arranged in said envelope, means
connected with said plates for applying a variable
for supplying a constant voltage to each of said
electric potential to said plates for creating a
plates, means for supplying an alternating volt
variable divergent electric ?eld pattern to select
age to each pair of said plates for creating a
electrons from successive elemental areas of said
variable divergent electric ?eld pattern to select
electron image in accordance with a predeter
electrons from successive elemental areas of said
mined scanning pattern and to pass said selected
electron image in accordance with a predeter- '
electrons between said ‘plates while de?ecting
mined scanning pattern and to pass said selected
substantially all other electrons toward said
electrons between said plates while de?ecting
plates to provide for a complete scansion of said
substantially all other electrons toward said
electron image, means for creating a constant
plates to provide for a complete scansion of said
electron image, a collector anode disposed in said 60 electron de?ecting ?eld to direct said selected
electrons toward said anode, and a device for ad
envelope to receive the electrons passed between
justing the strength of the electric ?eld between
said plates, said alternating voltage being varied
said electrode and said plates for controlling the
in accordance with said scanning pattern, and a
size of said successive elemental areas, thereby
device for adjusting the constant voltage supplied
to said electrode and to said plates for controlling 65 to control the effective size of the scanning aper
ture.
'
the size of said successive elemental areas, there
12. A television picture signal generating tube
by to control the e?ective size of the scanning
comprising an evacuated tranparent envelope in
aperture.
cluding a photoelectric cathode arranged at one
9. A television picture signal generating tube
comprising an evacuated envelope including a 70 end of said envelope, means for projecting a light
image through the other end of said envelope to
translucent photoelectric cathode, a collector an
ode positioned in said envelope opposite said
ward said cathode to produce an electron image,
two pairs of plates arranged in said envelope so i
cathode, means for projecting a light image upon
said cathode from a direction opposite said anode
as not to interfere with the light projected to
to produce an electron image, a plurality of de_ 75 ward said cathode, a collector anode positioned in
2,410,080
11
said envelope and arranged so as not to' interfere
with said light, an electrode for accelerating said
electron stream arranged adjacent said cathode,
means for supplying a constant voltage to said
12
15. In a picture analyzing device comprising a
photosensitive cathode and a collector anode, the
method which comprises the steps of producing
an electron image representative of a light image
electrode, de?ection control means operatively
projected on said photosensitive cathode, select
connected with said plates for applying a variable
ing electrons from successive elemental areas of
electric potential to said plates for creating a
said,electron image in accordance with a prede
variable divergent electric ?eld pattern to- select
termined scanning pattern, de?ecting said se
electrons from successive elemental areas 01' said
lected electrons toward said anode and de?ecting
electron image in accordance with a predeter 10 substantially all other electrons in opposite di
mined scanning pattern and to pass said selected
rections away from said anode in divergent paths.
electrons between said plates while de?ecting
16. In a picture analyzing device comprising a
substantially all other electrons toward said
photosensitive cathode and a collector anode, the
plates to provide for a complete scansion of said
method which comprises the steps of producing
electron image, means for creating aconstant 15' an electron image representative of a light image
electron de?ecting ?eld to direct said selected
projected on said photosensitive cathode, select
electrons toward said anode, means for focusing
ing electrons from successive elemental areas of
said selected electrons, and a device for adjust
said electron image in accordance with a prede
ing the strength of the electric held between said
termined scanning pattern, directing said selected
electrodeand said plates for controlling the size 20. electrons toward said anode, de?ecting substan
of said successive elemental areas, thereby to con
tially all other electrons away from said anode
trol the eilective size of the scanning aperture.
to provide for a complete scansion of said elec
13. In a picture analyzing device comprising a‘
tron image, and controlling the size 0! said suc
photosensitive cathode and a collector anode, the
cessive elemental areas, thereby to control the
method which comprises the steps of producing 26 effective size of the scanning aperture.
’
an electron image representative of a light image
1'7. In a picture analyzing device comprising a
projected on said photosensitive cathode, dispers
photosensitive cathode and a collector anode, the
ing the electrons of said image in predetermined
method which comprises the steps of projecting,
divergent paths to select electrons from a prede
a light image upon said photosensitive cathode,
termined incremental area thereof and collecting 80 producing an electron image representative of
said selected electrons from said predetermined
said light image, selecting electrons from suc
incremental area.
v
cessive elemental areas of said electron image in
14. In a picture analyzing device comprising a
accordance with a predetermined scanning pat
photosensitive cathode and a collector anode, the
tern, de?ecting substantially all other electrons
method which comprises the steps of producing 35 away from the direction oi’ electron emission from
an electron image representative of a light image
said cathode in- predetermined divergent paths to
projected on said photosensitive cathode, at
provide for a complete scansion of said electron
tracting electrons from all but one of the ele
image, and directing said selected electrons out
mental areas of said electron image in opposite
of the light projection path and toward said
directions along divergent paths away from the 40 anode,
direction of electron emission from said cathode
CLYDE E. HALLMARK.
and directing the electrons from said one ele
mental area of said electron image toward said
anode.
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 058 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа