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Патент USA US3094653

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June 18, 1963
J. A. BUCKBEE ETAL
3,094,544
ELECTRICAL STORAGE DEVICES
2 Sheets-Sheet 1
Filed 00T.. 28, 1959
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COLLECTOR VOLTAGE
By
ATTORNEY
June 18, 1963
J. A. BUCKBEE ETAL
3,094,644
ELECTRICAL STORAGE DEVICES
2 Sheets-Sheet 2
Filed Oct. 28, 1959
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ALBERT J. CLaUr/ER
ATTÜHNEY
United States Patent Oiiîce
l
3,094,644
ELECTRICAL STORAGE DEVICES
.Folin A. Bnclrbee, Weilesiey, and Albert Ji. Cloutier,
Natick, Mass., assignors to Raytheon Company, Lex
ington, Mass., a corporation of Delaware
Fiied @et 23, 1959, Ser. No. 849,2@
17 Claims. (Cl. Sid-12)
This «invention relates to electrical signal storage and
read~out devices and, more particularly, to such devices
known :as storage tubes in which an electron beam places
a charge pattern representative of said signals on a non
conductive electrode and said electrode modulates an
other beam during a read~out.
3,694,644
Patented June 18, 1963
2
erasure simultaneously with the read or the write cycles
and preferably simultaneous with the read cycle.
It is another object to employ a two-gun storage tube
such as described in the reference patents in conjunction
with suitable circuits to cause erasure of the stored pic
ture by the action of the read `beam while said picture is
being read.
It is :another object to provide means for varying the
degree of erasure which occurs each time the picture is
read.
In commercial television it is often desirable that the
scan rates of local receiver kinescopes be locked to the
frequency of the local power. This creates problems
where the received video is at a different scan rate from
the local power frequency. yIn the past this problem has
In the past, storage tubes of the aforesaid type have
been avoided by locking the scan rate of the television
been employed in radar display systems to store a given
receiver to the rate of the received video, thus making
radar picture. They have also been employed :to store
no use of the local power frequency. For example,
digital signals for use in a digital computer. In these
where video is transmitted at a rate of 60 half rasters
‘applications a single gun storage tube is often employed
for storing a picture or signals during a storage or write 20 a second l(each half raster consisting of alternate lines
which are interlaced to form a complete raster each 1/30
cycle and this picture may remain stored for long inter
of a second) the local power frequency where the tele
vals or may be read many times during read cycles before
vision receiver is located may be 59.9 cycles a second
erasure. In a single gun tube the erasure is often accom
and is, thus, totally unsuitable for driving the display of
plished during an interval at least as long `as the write
cycle Kand during this erasure interval neither write-in 25 the receiver. One embodiment of the present invention
contemplates a device `for solving this problem rather
nor read-out can be accomplished. In such applications
than avoiding it by converting `a television picture re
where a two-gun storage tube is employed, one gun is
ceived .at one `scan rate into an equivalent picture at an
denoted the write gun `and the other is denoted the read
other scan rate which is preferably in synchronism with
gun. Both guns operate simultaneously, often at differ
ent scan rates, the write gun placing the charge pattern 30 local power frequency. Consequently, it is another ob
ject of the present invention Ito employ a two-gun storage
representing a picture on the non-conductive electrode
tube, such as described in the reference patents, with
and the read gun reading said picture. Here again era
means for controlling voltages ’applied thereto such that
sure is accomplished by the `write beam and requires an
complete erasure is accomplished each time the read
interval equal to a normal write-in interval. One and
35 beam scans the stored picture, thereby providing the
two-gun storage tubes operating in these manners are
above-mentioned conversion.
described in U.S. Patents 2,713,648 and 2,547,638 to B. C.
It is a feature of the present invention to provide a
Gardner.
device for storing and subsequently reading electrical sig
For some applications of one and two-gun storage
»tube-s, such »as described in the reference patents, it is 40 nals, said device including an electrical storage target
with means providing storing and reading beams scan
desirable to slowly erase storage signals over the interval
ning opposite sides thereof, second ‘target means for inter
‘of many repeated read-out cycles so that the «amplitude
cepting said reading beam when said storage signals are
of the read-out signals steadily decreases. For example,
read `and thereupon admitting secondary electrons with
where the storage signals are video comprising a radar
means coupled to said targets for varying the vol-tage
for TV raster representing an animated scene, this scene
may be read-out at a rate different from the write-in rate
and »applied to a display. It is desir-able that moving
objects in the display be followed by a trail of fading
differential therebetween so that the number of scans of
said reading beam required to cancel said stored electrical
signals is varied.
It is a further feature of this invention that said elec
trical storage target have an electrically conductive side
and a non-conductive side and that said reading beam
scan the conductive side thereof and said storing beam
of time so that the most recently stored rasters will stand
scan the non-conductive side thereof and, furthermore,
out in sharp contrast in the display to earlier stored
to dispose said second target to intercept said reading
rasters of diminishing contrast. In the past this effect
has been accomplished by partially erasing the stored 55 beam before said reading beam strikes said storage tar
get, to ñx the voltage on the storage target to a relatively
rastcrs at regular intervals such as, for example, follow
ing every write cycle. In the single-gun storage tube
low value and to apply fa variable positive voltage to said
during the interval when erasure is accomplished, neither
second target, increases in said variable positive voltage
write-in nor read-out can occur and when a two-gun
serving to reduce the degree of erasure and decreases in
storage tube is employed write-in cannot be accomplished 60 said variable voltage serving to increase the degree of
during erasure. This results in a certain loss of informa
erasure accomplished during each scan of the storage tar
images representing previous positions of the objects.
Consequently, it is desirable that each stored raster fade
gradually and disappear from storage after a given period
tion particularly where objects in the picture move
rapidly.
get by the reading beam.
Other and further features and objects of this inven
tion will be more apparent from the following specific
overcome the above-mentioned limitations of prior sys 65 description of embodiments of this invention taken in
tems employing one and two-gun storage tubes.
conjunction with the drawings in which:
It is another object of the present invention to provide
FIG. 1 depicts a two-gun storage tube having a storage
means for splitting the read-gun electron beam, in a stor
target adjacent to a collector electrode with decelerating
age tube such `as described in the references, into two
currents and employ `one as the output video signal and 70 electrodes on either side for decelerating the read beam
land the write beam with means coupling thereto for vary
the other for erasing stored signals.
ing erase speed;
`It is another object to accomplish the above-mentioned
Therefore, it is one object of the present invention to
3,094,644
FIG. 2 is a diagram describing the principles of opera
100 volts by coupling to battery Z2. Meanwhile, collector
tion of a system in FIG. l;
FIG. 3 shows energy distribution curves of secondary
electrons emitted from the collector target for three dif
ferent collector voltages;
,
FIG. 4 is a curve of relative erase speed Versus collector
voltage in which erase speed is proportional to the num
ber of secondary electrons resulting from elastic collision;
electrode 5 is D.C. coupled via output filter 1d» to po
tentiometer 23 which is mechanically positioned by erase
5
speed control I9. Potentiometer 23 functions as a volt
age divider and is coupled across 6 -volt battery Z0 and a
500 volt battery 24 and, consequently, :any voltage be
tween 0 and plus 500 volts may be applied to collector
electrode 5 by adapting erase speed control 419. Ac
celerating electrodes 6 yand 7 for accelera-ting the write
and
FIG. 5 depicts one use of the system shown in FIG. l 10 gun and the read gun, respectively, are coupled to 100
for converting television video lat one sweep rate into
and 500 volt batteries 22 and 24, respectively. Surfaces
video «at another sweep rate.
Y
25 and y26 are aqu‘adaged in tube 1 and preferably main
Turning first to FIG. l there is shown a two-gun storage
tained at Ia very large positive potential. For »this purpose
tube l with a read electron gun 2 and a write electron
4,000 volt battery 27 is coupled to the surfaces.
gun 3‘. This storage tube operates in much the same 15
Turning to FIG. 2 there is shown an enlarged represen
manner as the two-gun storage tubes described in the
tation of the presumed action and ñ'ow of electrons at
reference patents. IIn principle, the tube contains a storage
the electrodes resulting from the read and writing elec~
target 4 consisting of a fine mesh screen having a dielec
tron beams impinging thereon. In operation, the write
tric or a non-conductive surface 4a coating one side dis
gun cathode at minus 400 volts emits a stream of elec
posed towards the write gun 3. The tube also contains 20 trons, most of which «are passed through decelerating
a collector electrode 5 which is preferably la fine mesh
electrode 6 and collector electrode 5 land impinge on the
screen, from which the video signal is obtained during
dielectric surface 4a which, in turn, emits ysecondary elec
read out. The other electrodes 6 and 7 disposed between
trons and these secondary electrons are collected by col
the storage and collector electrodes 4 and 5 and the read
lector electrode 5. Since the beam from mite gun 3 is
and write guns, respectively, serve to decelerate and 25 modulated by video, a variable number of secondary elec
collimate the beams from the write gun and the read gun.
trons 23a will be emitted from dielectric surface 4a as
The‘write gun beam is caused to scan by the field from
the beam from gun 3 scans out a raster of video thereon,
sweepi coil 8` and the read gun beam is caused to scan by
»and the charge 'at different spots on «the dielectric surface
the field from sweep coil 9‘. Focussing of each of the
will vary from a minimum of 0 Volts to a maximum of
beams is accomplished by focussing coils 10 and 11.
30 approximately l0 Volts.
In operation of a storage tube of this type, video signals
In the meantime, a beam of electrons from read gun 2
from an input 12 control the cathode of write gun 3 so
whose cathode is vat ground potential is accelerated and
that a beam of varying intensity issues therefrom and
passes through electrode 7, to storage electrode 4 and,
strikes the non-conductive or dielectric surface of storage
depending on the charge stored at the different spots on
electrode 4 causing secondary electrons to be emitted 35 dielectric surface 4a, different portions of this beam will
therefrom, the number of said secondary electrons being
pass through storage screen 4 and impinge on collector
a function of the intensity of the beam. These secondary
screen 5. Consequently, the intensity of the beam from
electrons are collected by collector electrode 5 and an
gun 2 which impinges on collector electrodes 5 will be
electron picture is therefore stored on the dielectric which
modulated by the charge on dielectric surface da as the
represents the video signals output from input 12. In the 40 beam from gun 2 scans out la raster on that surface. The
meanwhile, a beam from read gun 2 approaches storage
read gun beam is then effectively split into two parts,
electrode 4 land depending on the electron charge stored
one part generating a current in electrode 5 which repre
'by the dielectric surface 4ta, a greater or lesser portion
sents stored picture video and the other part erasing the
of this electrode beam vwill pass through the storage elec
stored charge on dielectric surface 4a. This is ac
trode and impinge on the collector electrode 5 causing 45 complished as follows: Upon striking collector electrode
a varying current to flow from electrode 5 to ground.
5 4at a voltage variable up to 500 volts, the modulated
This varying current is, of course, a measure of the elec
portion of the beam from read gun 2 will genenate a
tron charge stored in dielectric 4a las it is scanned and,
current in electrode 5 which will represent video of the
consequently, is a video signal describing the picture
picture stored therein at a scan rate established by the
stored therein. It has been found convenient to modulate 50 scanning rate of the beam from read gun 2. This im
the beam from read gun 2 with an RF signal and to de
pingement of the read beam on collector electrode 5 will
tect the RF frequency in the output from collector elec
cause secondary electrons to be emitted therefrom and
trode 5. For this purpose, RF oscillator ‘13 controls the
some of these secondary electrons, denoted 28h, have
intensity of the beam from read gun 2 and output filter
energies equal to the incident primary beam and it can
14 couples the signal from collector electrode 5 to a suit 55 be reasonably assumed :that they will reach the dielectric
able utilization device 15, via an RF preamplifier 16 and
surface 4a and erase the positive charge stored therein.
video detector 17.
Turning next to» FIG. 3 there is shown au energy distri
As already mentioned above with reference to prior
bution curve of ysecond-ary electrons emitted from collector
systems, the stored electron picture may be periodically
electrode 5 for different collector voltages. The family of
erased during a Write cycle in which case no video sig 60 three curves shown in FIG. 3 and represented as broken
nals are applied to the 4write gun 3 during one cycle of its
line 29, dot-dash line 30 and solid line 3l represent the
operation and suitable voltages are applied to the elec
energy distribution of secondary electrons emitted from
trodes for insuring the deposit of an even distribution of
collector electrode 5 for increasing electrode voltages.
charge throughout the dielectric coating 4a. It is the
As can be seen from the curves in FIG. 3 the distribution
purpose of the present invention to avoid the necessity 65 of electron energy at relatively low energy is similar for
of setting aside a complete write cycle to accomplish this
each of the three collector electrode voltages and Varies
erasure and for this purpose, special voltage supply i8
somewhat only because more secondary electrons are
with manual erase speed control v19 coupled thereto is
emitted lat the higher voltage (the solid curve) than at the
employed for imposing suitable voltages to the electrodes.
voltage (the broken curve). However, at the higher
As is shown by voltage supply 18, a relatively low posi 70 low
energy levels, distinct and separate peaks in each of the
tive voltage, such as for example 6 volts, from battery 20
three curves occur indicating that large numbers of elec
is applied to .the conductive part of storage electrode 4
while at the same time the cathode of write gun 3 is
trons are emitted 'at different narrow energy bands for each
of the voltages. Furthermore, Ithis narrow energy band
preferably rat minus 400 volts by virtue of coupling to
the lowest electrode voltage includes appreciably
battery 21 and laccelerating electrode 6 is placed at plus 75 for
morersecondary electrons than for the higher voltages.
aegee-i4.
5
Consequently, peak 29a in low voltage curve 2? is higher
than peak 31a in high voltage curves 3l.
ïhe shapes of these energy distribution curves can be
accounted for as follows: Generally speaking, secondary
electrons can be classiñed in three classes denoted I, II,
and III. For example, class I secondaries include no
primary beam electrons but only low energy secondary
6
creasing the voltage differential between electrodes 4 and
5. In fact, a differential can be obtained at which complete
erasure of the stored electronic signals on dielectric surface
4a is accomplished during each scan of that surface by the
beam from read gun 2.
Turning next to FIG. 5 .there is shown one utilization of
the system shown in FIG. l operating in accordance with
the principles described above with reference to FIGS. l,
2, 3 and 4. This system in FIG. 5 effectively stores succes
peaks in the distribution curves of the three different
voltages. Class II secondary electrons include many 10 sive rasters of a typical television picture such as might be
transmitted to home receivers and reads the stored picture
primary electrons resulting from inelastic collision. There
at a different sweep rate, thereby creating video suitable
fore, these class Il electrons have energies Varying over
for said different sweep rate. Such a conversion of video
a wide range extending to a considerably higher level than
electrons, thereby accounting for the similar~ coincident
the pure secondary electrons included in class I. Finally,
class III includes only primary electrons resulting from
,elastic collisionsand consequently, electrons in this group
at one sweep rate to video of another sweep rate may be
desirable where, for example, the local power frequency
is different from the sweep rate of the received video
The system includes?'a storage tube 1 having
its electrodes coupled to voltage supply 18 with manual
erase speed control I9 coupled to said voltage supply, an
energy ranges of these three classes are shown in FIG.
3 with reference to distribution curve 3i only. As shown, 20 output ñlter 14 coupled to voltage supply 18 and also
coupled to electrode 5 with a suitable RF preamplifier
class I includes the greatest number of electrons all falling
amplifying the output of ñlter 14 and feeding signals to
within ya `somewhat symmetrically shaped distribution
video detector 17. This part of the system shown in FIG.
curve; class II includes a rather even distribution of elec
5 operates exactly as the system already described in de
trons over a wide range of energies and class III is repre
tail with reference lto FIG. 1. In operation, signals are
sented >by a sharp spike of high energy electrons.
received by receiver 32 from transmitter 33, each having
Itis one of the purposes of this invention to accomplish
suitable antennas attached, and the output of receiver 32
erasure by effectively flooding the dielectric storage sur
are at a high energy level approximately (or exactly)
equal to the voltage on the collector electrode. The
' picture.
is applied to video detector 32 and to sync detector 35.
Sync detector 35 extracts sync signals in the output of the
an energy equivalent to the voltage differential between 30 receiver and applies them to a sweep generator which
controls deíiection coils S causing the beam from write
lthe voltage on collector electrode 5 and read gun cathode
face 4a with electrons emitted from collector electrode 5.
VSince the electrons striking collector electrode 5 have
voltage (ground) and since secondaries emitted from elec
trode 5 must travel back .to storage electrode 4 which is at
about the same potential as the read gun catho-de, it is evi
dent that only those secondary electrons resulting from
gun 3 to scan a raster in synchronism with the scan rate
of the received video. The received video from detector
39 controls the intensity of the beam from the write gun
Il` and, consequently, the received video raster is stored
on the dielectric surface 4a of storage screen 4. Mean
elastic collision of the read beam on collector electrode
while, deflection coil 11 is energized by sweep generator
5 will have sufficient energy to make the return trip and
36 which is controlled by the output of a local sync gener
thereby erase the charge picture stored on dielectric sur
ator 37 causing the beam from read gun 2 to scan storage
face 4a. Furthermore, the current of these high energy
secondary electrons will vary depending on the current of 40 screen 4. At the same time, the current flow to collector
electrode ‘5 is detected and applied to lilter 14 whose out
the electron beam from gun 2 which strikes collector elec
put is amplified by preamplilier 16 and the video content
trode 5. If the voltage on electrode 5l is large with respect
therein is detected by video detector 17. This video is in
to storage electrode 4, energy distribution of electrons
synchronism with local power `frequency since the local
emitted therefrom will be essentially as described by curve
31 and only a small current of these »secondary electrons 45 sync generator 37 is subject to local power frequency.
The output of sync generator 37 and video detector
will have sufficient energy to reach dielectric surface 4a
17 are combined in combining circuit 38 to yield a com
and, consequently, the degree of erasure will be small.
posite of video suitable for energizing the video circuits
On the other hand, if the voltage on collector electrode 5
of a kinescope or for control of a transmitter or any other
is only a few volts greater than the voltage on storage elec
trode 4 then the distribution of secondary electrons emit 50 useful purpose. For example the output of circuit 37
might be applied to a -local TV transmitter, in which case
ted from electrode S will -be substantially as shown by dis
it is preferable that the local transmitter transmit only to
tribution curve 29 and the current of secondary electrons
receivers subject to the same local power frequency. Ob
having suflicient energy to travel from electrode 5 back to
viously, «other uses could be made of the present inven
dielectric surface 4a will be large and, therefore, erasure
will be complete. It should be noted that where the volt 55 tion in addition to the one use described with reference
to FIG. 5. For example, use could be made in a radar
age differential between electrodes `4 and 5 is large, the
system having some sort of a display such as a PPI cath
majority of secondary electrons emitted from electrode
ode ray tube display which presents a number of targets
5 are class I electrons and do not have suñicient energy to
`and in which it is desirable to also »display target history
travel back to the dielectric surface 4a and will merely
fall back to collector electrode -5 having no effect. On 60 or past position as a tail on each target. In such applica
tion where all targets move very slowly, it may be desir
the other hand, when the Voltage differential is quite
able to maintain a longer history by erasing very slowly,
small, the energy difference between elastic collision
in which case -a large collector electrode voltage is desir
secondaries (class III electrons) and true secondaries
able. On the other hand, where the targets move very
(class I) is negligible and, consequently, many class I
secondaries will also travel back to dielectric surface 4a. 65 rapidly it may be desirable to retain only a short history
of the target motion in which case a relatively fast erasure
Turning next to FIG. 4 there is shown a plot of the rela
time is desired which can be accomplished by maintaining
tive number of class III electrons as a function of collector
a relatively low collector electrode voltage in the storage
voltage. This plot might »also be called erase speed versus
tube.
collector voltage since it is the number of class III elec
trons which determines the degree of erasure accomplished 70 There are obviously many other uses of a storage tube
operated and controlled as described in this invention
during each scan of the read gun beam and if these scans
and while one embodiment is shown employing a four
are continually occurring, then it can be said that the rela
electrode storage tube with electrode potentials provided
tive number of class III electrons is representative of erase
by batteries and means for varying potential on one elec
speed and inversely representative of erase time. Obvi
ously, from FIG. 4, erase speed can be increased by de 75 trede, it is to be understood that this is made only by
acoge@
»i
0
way of example and that any suitable voltage supply could
be substituted therefor without ldeviating from the spirit
or scope of the invention as set forth in the accompany
suitable secondary emission characteristics for intercept
ing claims.
ing one of said beams when said stored signals are read
‘What is claimed is:
1. In combination with an electron storage device
having storage and collector electrodes, a signal output
coupled to said collector electrode and provided with
sources of electron beams `for writing ian-d reading sig
nals therein, means for causing said 4beams to scan said
storage electrode, means for energizing said electrodes at
voltages positive with respect to the voltage of the source
of said read beam and means for varying the voltage dif
ferential between said electrodes simultaneously produc
ing said signals at said -output 'and cancelling said sig
mals written therein by varying electron flow from said
collector electrode to said storage electrode.
2. In combination with an electron storage device
having a storage electrode for storing input signals and
storage target with means providing electron lbeams for
scanning both sides thereof, second target «means having
and thereupon emitting secondary electrons at least a
portion of which result from elastic collision of said one
beam on said second target, means coupled to said targets
for energizing said targets `at voltages positive with respect
to the voltage of the source of said one beam, and for
producing a voltage diiîerential `between said targets so
that 'the number of scans of said one beam required to
cancel said stored electrical signals is determined.
7. A device for storing and subsequently reading elec
trical signals including an electron storage target with
means providing electron beams for scanning both sides
thereof, second target means for intercepting one of said
beams when said stored signals are read and emitting sec
ondary electrons -a portion of which result from elastic
collision of Vsaid one beam on said second target, means
a collector electrode producing output signals and pro 20 coupled to said targets for `energizing said targets at volt
vided with electron beam generating means for scanning
ages positive with respect to the voltage of the source of
one side of said storage electrode to store signals therein
said one beam and -for producing a voltage differential
yand for scanning the other side of said storage electrode
between said storage target and said second target to
to produce a beam modulated by stored input signals
control the current of said portion of secondary elec
which impinges on said col-lector electrode, means for 25 trons which flow to said storage target cancelling said
energizing said electrodes at voltages positive with re
stored electrical signals as said stored signals are read.
spect to the voltage of the source of said beam which
8. A device for storing and reading electrical signals
scans said other side, means for decreasing the voltage
including an electron storage target with means provid
differential between said electrodes simultaneously pro
ing storing and reading beams scanning opposite sides
ducing said signal output while increasing electron ilow 30 thereof, second target means `for intercepting said reading
from said collector electrode to said storage elect-rode
beam when said stored signals are read and emitting sec
erasing said signals stored therein.
ondary electrons some of which are `at substantially the
3. In combination `with an electron storage device
same energy as said reading beam electrons and means
having a storage electrode for storing input signals and
coupled to said storage target and said second target for
»a collector electrode producing output signals and pro 35 energizing said targets 'at voltages positive «with respect
vided with electron ybeam generating means for scanning
to the voltage of the source of said reading beam and
one side of said storage electrode to store signals therein
for producing a voltage differential between said targets
and for scanning the -other side of said storage electrode
so that the current of said secondary electrons, at substan
to produce »a beam modulated by said storage signals
tially
the same energy, is determined causing a variable
which impinges on said collector electrode7 means for 40 degree :of cancellation of said stored electrica-l signals as
splitting said modulated beam into two parts, one part
said stored signals are read.
being collected by said collector electrode and repre
9. A device for rapidly storing different electrical sig
senting youtput signal and the other part falling on said
nals and rapidly reading said stored signals including an
storage electrode erasing signals stored therein compris
electron storage target with means providing storing and
ing means -for energizing said electrodes at voltages posi 45 reading beams scanning opposite sides thereof, second
tive with respect to the voltage of the source of said
target means íntercepting said reading beam when said
beam for scanning said other side, and means for pro
stored signals are read and producing secondary emission,
ducing a voltage differential between said electrodes to
and means coupled to said storage and second target for
determine the magnitude of said beam falling on said
energizing said targets at voltages positive with respect
target electrode.
50
to the voltage of the source of said reading beam and for
4. A device for storing `and subsequently reading elec
varying the voltage ,differential between said targets so
trical signals including an electron storage target with
that said secondary emission flows to said storage target
means providing electron beams for scanning both sides
cancelling said storage signals to a controlled degree as
thereof, second target means for intercepting one of said
said stored signals are read.
beams when said stored signals are read, means for ener 55
l0. A device for rapidly storing different electrical
gizing said targets at voltages positive with respect to the
signals at one scan rate and rapidly reading said stored
voltage of the source «of said one beam, and means cou
signals at `another scan rate including an electron storage
pled to said targets for `decreasing the voltage differential
therebetween to increase electron flow to said storage
target having one conductive and one non-conductive sur
60 face and means providing storing and reading beams such
target erasing electrical signals stored therein.
that said storing beam scans said non-conductive surface,
5. A device for storing `and subsequently reading elec
second target means for collecting secondary emission
trical signals including an «electron storage target with
from said non-conductive surface when said surface is
means providing electron beams for scanning both sides
scanned by said storing beam and for intercepting said
thereof, second target means for intercepting one of said
reading beam when said stored signals are read and there
beams when said stored signals are read simultaneously 65 upon emitting secondary electrons, and means for ener
producing output signals `and emitting secondary elec
gizing said conductive surface and said second target at
trons, means coupled to said targets for energizing said
voltages positive with respect to the source of said read
targets at voltages positive with respect to the voltage of
ing beam and for varying the voltage ldifferential between
the source of said one vbeam and for decreasing the volt
age ydiíïerential between said targets to increase the num
70 said conductive surface and said second target soy that at
ber of said secondary electrons having sufficient energy to
travel to said storage target and cancel said stored elec
ergy level equivalent to said voltage differential and licw
to said non-conductive surface cancelling the signals stored
trical signals.
least a portion of said secondary electrons are Kat an en
thereon to a degree controlled by said means for varying
6r. An electron storage device including an electron 75 voltage -ditïerential as said stored signals are read.
3,094,644
11. An electrical charge storage device including a
perforated storage target having an electrically conduc
tive side `and a non-conductive side with means providing
electron beams `for scanning each of said sides, said de
vice comprising second target means with an output cou
pled thereto for intercepting the portion of the beam
scanning said conductive side which passes through said
perforated storage target, means for energizing said con
ductive side and said second target at voltages positive
l@
whereby said stored signals may be cancelled to a con
trolled degree as said stored signals are read.
14. A storage device for storing electrical signals corn
prising an electr-on storage electrode for storing said sig
nals, an electron collector electrode, means for producing
writing and reading electr-on beams, means for causing
said beams to scan said electrodes, means for energizing
said electrodes at potentials positive with respect to said
means for producing said reading beam, and means for
producing
a voltage diiîerential between said electrodes
10
with respect to the source of said beam which scans said
to thereby erase signals stored on said storage electrode.
conductive side, and means for controlling the voltage
l5. A storage device for storing electrical signals com
differential between said conductive side and said second
prising an electron storage electr-ode for storing said sig
target so that simultaneously said 4output produces a sig
nals, an electron collector electrode, an output coupled
nal representative of said stored charge and said stored
to said collector electrode, means for producing writing
charge is substantially cancelled in a variable number of
and reading electron beams, means for causing said beams
scans of said beam scanning said non-conductive side
to scan said electrodes, means for energizing said
when said voltage diiîerential is varied.
electrodes at potentials positive with »respect to said means
12. An electrical signal storage device comprising a
for producing said reading beam, and means for produc
first electrode for storing input electrical signals, means
for generating and launching lirst and second electron 20 ing a voltage differential between said electrodes to there
by erase said stored signals.
beams toward said first electrode, means Íor periodically
16. A storage device `for storing electrical signals corn
deiiecting said iirst aand second beams causing said beams
prising
an electron storage electrode for storing said sig
to sweep parts of said iirst electrode, a second electrode
nals, an electron collector electrode, means coupling an
for intercepting said ñrst beam electrons which pass
output from said collector electrode, means for produc
through said first electrode, means for modulating said
ing writing and rea-ding electron beams for scanning said
second beam with said input signals whereby said input
electrodes producing said output when said reading beam
signals are stored by said first electrode, means coupled to
scans said electrodes, means for energizing said electrodes
said second electrode for producing output `signals repre
at potentials positive with respect to said means for pro
sentative of said stored signals and means for energizing
30 ducing said reading beam, and means for producing a
said second electrode at a potential positive with respect
voltage differential between said electrodes to simultane
to said iirst electrode whereby simultaneously said input
ously erase said signals and produce said output.
signals are stored, said output is produced and said stored
17. A storage device for storing electrical signals com
signals are cancelled.
prising an electron storage electrode for storing said sig
13. A device for storing and subsequentially reading
electrical signals including a perforated storage target
having an electrical conductive side and a non-conductive
side with means providing write and read electron beams,
35 nals, an electron collector electrode, means coupling an
output from said collector electrode, means for producing
writing and reading electron beams for scanning said
electrodes producing said output when said reading beam
said write beam scanning said non-conductive side and said
said electrodes, means »for energizing said electrodes
read beam scanning said conductive side of said storage 40 scans
at potentials positive with respect to said means for pro
target, said device comprising second target means disducing said reading beam, and means for decreasing the
posed to intercept the portion of said read beam which
voltage differential between said electrodes while said
passes through said perforated storage target thereby
electrodes are scanned by said reading beam to increase
producing an output signal representative of stored sig
nals, said second target emitting secondary electrons when 45 the flow of electrons to said storage electrode which erase
said stored signals.
struck by said portion of said read beam, means for ener»
gizing said conductive side and said second target at
References Cited in the file of this patent
vol-tages positive with respect to the source of said read
UNITED STATES PATENTS
beam so that sorne of said secondary electrons have en
ergy substantially equal to the voltage differential between 50 2,826,714
Forgue ______________ __ Mar. 11, 1958
said storage and said second target, and means coupled
Kompfner ___________ __ Mar. 24, 1959
2,879,442
to said device for controlling said voltage diiïerential
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