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Патент USA US2412542

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Dec. 10, 1946.
|__ chSMlTH
2,412,542
DEFLECTI ON CIRCUITS
Filed May 25, 1944
INVENTOR. -
nyyrffgm
ATTORNEY
2,412,542
Patented Dec. 10, 1946
UNITED STATES PATENT OFFICE
2,412,542
DEFLECTION CIRCUITS
Lester C. Smith, Westmont, N. J., assignor to
Radio Corporation of America, a corporation
of Delaware
Application May 25, 1944, Serial No. 537,275
10 Claims. (01. 250-27)
1
This invention relates to an improvement in
cathode ray beam de?ection generators for use
in oscilloscopic or other related apparatus.
As is well known to those skilled in the art, a
cathode ray oscilloscope includes, in general, a
circuit arrangement for causing the cathode ray
beam that is generated in a cathode ray tube to
be repeatedly de?ected across the viewing screen
of the cathode ray tube in a horizontal direction,
while the transient or voltage variation to be
observed is generally applied, after appropriate
ampli?cation, to the vertical de?ecting plates of
the cathode ray tube to cause the beam to be de
?ected in a vertical direction across the screen
of the cathode ray tube. The horizontal de?ec~
tion circuit is generally so constructed as to per
mit the de?ection rate to be varied within very
wide limits in order that the rate at which the
cathode ray beam is de?ected horizontally (gen
erally in a linear manner) may be varied to per
mit convenient inspection of the trace regardless
of the rate of variation of the voltage variations
under observation.
In normal use of the cathode ray oscilloscope,
the horizontal de?ections of the cathode ray
beams are continued at a predetermined rate, and
if the voltage variations under observation reoc
cur at a predetermined rate, a proper choice of
the recurrence rate of the horizontal de?ection
of the cathode ray beam will cause a substantially 30
stationary trace or image to appear on the screen
of the cathode ray tube.
7
There are instances, however, when the voltage
variation or phenomenon under observation is not
regularly recurrent, and under these circum
stances it is not possible to relate the horizontal
de?ection rate to the occurrence frequency of the
voltage variations under observation, with the
result that a substantially stationary image can
not be produced on the viewing screen of the
cathode ray tube.
Under conditions where the transient voltage
2
the viewing screen, the cathode ray beam must
?rst be quickly deflected to the left side of the
screen before the sweep or relatively slower de
?ection can take place from the left side of the
screen to the right in the usual manner. This
interval in returning the cathode ray beam to
the left side of the screen prior to its de?ection
at a predetermined rate occupies some period of
time, and accordingly it is possible that a por
10 tion of the voltage variations to be observed will
be lost during this return time interval. Should
the transient condition prevail for a relatively
short space of time, an appreciable portion of the
voltage variations to be observed may be entirely
lost even though the de?ection rate may be in
creased to a relatively high speed.
Furthermore, in such devices as have hereto
fore been used, the circuit arrangement for caus
ing the single sweep action has not been wholly
satisfactory since in many cases a rather intense
triggering potential is required to cause opera
tion of the single sweep mechanism. This initial
intense impulse is in many instances not avail
able, since it is not uncommon for a transient
condition to commence at relatively low ampli
tude, and under such circumstances the single
sweep circuit arrangement would not respond
until the transient condition has persisted for an
appreciable portion of its interval.
Also, in other single sweep circuits, the selec
tion of sweep rates is ordinarily adjustable only in
?xed steps or over a relatively narrow range and
the signal under observation must be recurrent
within certain ?xed time limits.
In order to overcome these difficulties, the pres
ent invention provides a single sweep circuit ar
rangement whereby the cathode ray beam is nor
mally biased in a stationary position at the left
side of the screen so that upon the occurrence of a
transient condition or a voltage variation to be
observed, the cathode ray beam is in immediate
condition to start its useful de?ection from the
left to the right side of the viewing screen. Fur~
variation to be observed is not regularly recur
thermore, in accordance with the present inven
rent, cathode ray Oscilloscopes have been used
in which a so-called “single sweep” operation is‘ 45 tion and by reason of the particular single sweep
circuit arrangement provided therein, the single
possible, and under these circumstances the cath
sweep operation may be initiated on a relatively
ode ray beam is generally biased to remain nor
mally stationary, with circuit arrangements such
low intensity voltage variation in order that vir
tually all of the transient condition may be effec
that when a transient condition is impressed upon
tive in producing an observable signal trace on
the apparatus to cause vertical de?ections of the 50
the viewing screen of the cathode ray tube. In
cathode ray beam, a simultaneous single sweep
addition to these provisions, the single sweep cir
or single horizontal de?ection of the cathode ray
cuit arrangement also provides means whereby
beam is brought about.
the rate of sweep may be continuously varied
When the cathode ray beam is normally biased
in a stationary condition at the right hand side of 55 within wide limits to cause the cathode ray beam
2,412,542
3
4
to traverse the screen at any desired rate, and
furthermore, by means of the present circuit ar
rangements the transient to be observed may re
dividually selected and included in the circuit.
occur as rapidly as 20,000 or more times per sec
0nd or at any slower rate, even to a vsingle isolated
instance. Regardless of the duration or occur
rence rate of the transient the circuit arrange
rnent can be adjusted to produce a single de?ec
A movable arm or" the selector switch 48 is con
nected to the control electrode 132 of tube 12
by way of small resistance 134. A grid resistance
is connected between the cathode l6 of tube Ill
and the junction of selector switch 48 and re
sistance 44. This grid resistance includes pref
erably a ?xed resistance element 46 and a vari
tion of the cathode ray beam for each individual
able resistance elernent 48. The cathode 50 of
transient and by controlling the rate of de?ection 10 tube I2 is shown connected to the cathode Hi of
the trace produced by the transient can be caused
tube it by way of resistance 52, although this
to occupy a substantial portion of the useful area
resistance is not essential in all instances. This
of the observation screen.
resistance 52 is small as compared with the cath
One of the purposes of the present invention
ode resistance IG, and if included in the circuit
resides, therefore, in the provision of a new and 15 provides some automatic biasing of tube l2 rela
improved single sweep circuit arrangement for
tive to the biasing of the cathode M of tube In.
use in connection with cathode ray oscilloscope
The cathode resistance i6 is naturaly common
apparatus.
to both tubes.
Another purpose of the present invention re
A plurality of selectable sweep condensers 54,
sides in the provision of a single sweep circuit 20 55 and 59 are included between an anode 58
arrangement for a cathode ray oscilloscope in
of tube E2 and ground. One terminal of each of
which the cathode ray beam is normally biased
the condensers is connected to the anode 58
in its returned position, the return deflection
whereas the other terminal of a selected one of
of the cathode ray beam taking place immediately
the condensers may be connected to ground by
following each single sweep de?ection rather 25 way of selector switch til. For proper operation
than immediately prior to each single sweep de
flection.
Still another purpose of the present invention
resides in the provision of means whereby the
single sweep deflection circuit may be caused to
respond to relatively low intensity voltage vari—
ations derived from the applied transient to be
observed.
of the system, the series of condensers 54, 55 and
58 is preferably about ten times the capacity of
the series of condensers 36, 3?, and 38, and the
two selector switches 40 and 69 are preferably
ganged together for simultaneous operation.
The anode 53 of tube i2 is connected to pos
itive terminal 3?. by Way of ?xed resistance 62
and variable resistance 64. The variable resist
Still a further purpose of the present inven
ance as included in the anode circuit of tube l3’.
tion resides in the provision of a single sweep 35 and the variable resistance 48 connected in the
de?ection circuit for use with a cathode ray os
grid circuit of tube l2 are preferably ganged to
cilloscope in which the rate of de?ection during
gether in order that their values may be simul
each de?ection cycle may be varied within very
taneously controlled. Variation in the size of
wide limits.
resistance 64 affects the charging rate of the se
Another purpose of the present invention re 40 lected condenser 56, 55 or 56 and accordingly pro
sides in the provision of a single sweep deflection
vides a Vernier or ?ne adjustment for determin
circuit for use in an oscilloscope in which proper
ing the sweep rate and length of sweep, while
single sweep operation will result regardless of
simultaneous adjustment of resistance 48 changes
the repetition frequency of the transient, or even
duration of charging cycle and thereby deter
in the absence of any repetition.
mines total amount of charge of potential of
Still other purposes and advantages of the
anode 58. The coarse adjustment is, of course,
present invention will become more apparent to
determined by the particular pair of condensers
those skilled in the art from the following de
selected by the selector switches ti! and 53.
tailed description of the invention, particularly
The voltage variations appearing across the
when considered in connection with the draw
selected condenser 54, 55 or 56 provide the. desired
ing, wherein the single ?gure represents a pre
sweep potential variations, and accordingly the
ferred form of the present invention.
output may be derived from terminals 65 con
Referring now to the drawing, the single sweep
nected between ground and the anode 58 of
de?ection circuit includes two electron discharge
tube l2.
tubes l8 and i2, each of which includes at least
In general, the deflection voltage variations
a cathode, a control electrode and an anode.
are produced by a charging of the condenser
The cathode it of tube i0 is connected to
selected by selector switch 553 from positive ter
ground by way of cathode resistance I6, in series
minal 32 over resistances 54 and 62. As long as
with which may be connected a small inductance
the condensers are not permitted to charge to
H3. The control electrode 20 of tube I0 is con 60 the full applied position potential, a substantially
nected to input terminal 22 by way of coupling
linear charge condition or voltage variation may
condenser 24 and relatively small resistance 26.
be produced at the anode 53 of tube [2. When
The condenser 24 and resistance 26 are connected
the charge has reached a predetermined pro
in series, and the junction of these elements is
portion, the tube i2 is permitted to conduct,
connected to ground by Way of grid resistor 28.
which results in a substantially instantaneous
The anode 53 of tube ill is connected to positive
discharge of the selected condenser through tube
terminal 32 (to which anode supply voltage is ap
l2. During this discharge interval, current flows
plied) by way of load resistance 34.
through tube I2 and, accordingly, through cath
For coupling tube ID to tube I2, a plurality of
ode resistances 16 and 52. ‘The voltage drop pro
selectable coupling condensers 36, 31, and 38 are
employed, and one terminal of each of these
condensers is connected to the anode 30 of tube
It]. The other terminal of each of these con
densers is connected to a selector switch 40 in
order that one of the condensers may be in
duccd across resistance i6 therefore drives the
cathode of tube ill in a positive direction, re
sulting in an increase in the bias of tube i8
which causes this tube to become non-conductive.
For single sweep operation, this condition of con
duction through tube i2 should persist, and the
2,412,542
substantiallynon-conduction condition of tube
Ill should also persist.
When it is desired to permit a charge to accu
mulate on one of the selected condensers 54, 55
or 56, and accordingly, to cause a. de?ection of the
path with respect to the load resistances 62 and
64 associated with tube I2, so that the anode cur
rent of tube I2 is then permitted to flow through
both of these paths and since the impedance of
the diode ‘I6 is relatively low, the potential of the
anode 58 of tube I2 will be maintained at a po
cathode ray beam, a positive triggering impulse
tential corresponding substantially to the poten
is applied to the control electrode 20 of tube I0
‘tial determined by the setting of the movable con
which renders tube I0 conductive and the poten
tact along the potentiometer ‘I4. Tube I2 will,
tial at the anode of tube I6 is, therefore, driven
therefore, continue to conduct and the selected
10
in a negative direction. This negative impulse
condenser 54, 55 or 56 will be maintained in a
in then applied by Way of one of the selected
discharged condition.
.
condensers 36, 31 or 33 to the control electrode
Furthermore,
since
the
ungrounded
terminal
42 of tube I2 to render tube I2 non-conductive.
of the selected condenser is connected to the
During its non-conductive condition, the selected
anode 58 of tube I2, an adjustment of the mov
condenser 54, 55 or 56 is permitted to charge 15 ' able contact along potentiometer ‘I4 will deter
through resistances 62 and 64 and, accordingly a
mine the potential to which the particular se
sweep deflection potential variation is developed.
lected condenser is discharged. While tube I2 re
Immediately following the sweep de?ection tube
mains in this conducting condition, tube In is
I2 discharges the particular charged condenser
substantially non-conducting, and since the diode
20
and renders tube Ill non-conducting, or substan
68 is, in effect, connected in parallel with the
tially so, thus preparing the circuit for the next
load impedance 34 of tube N3, the gain of tube
operation cycle.
I0 is reduced to a very low value. It will be ob- ‘
In order that this desired cycle of operation may
served that the anode 16 of diode 68 is connected
be assured and in order that the circuit may be
the anode 3B of tube I0, whereas the cathode
responsive to relatively low intensity triggering 25 to
‘I8 of diode 68 is connected to a movable point
potentials applied to the control electrode 20 of
along potentiometer ‘I2.
tube ID, the circuit includes, in addition to the
When a positive triggering impulse is applied
elements above described, diodes or unidirectional
to terminal 22, tube I0 is rendered momentarily
conducting devices 68 and ‘I0. Each of these
conducting since the bias on the tube is reduced,
diodes includes at least a cathode and an anode.
and this conducting ‘condition causes the poten
For maintaining proper operating potential on
tial at the anode 30 of tube I0 to change in a
the electrodes of the diodes, two potentiometers
negative direction which removes the effect of the
‘I2 and ‘I4 may be connected in series between pos
diode 68 and subsequently causes a negative im
itive terminal 32 and ground or the negative anode
pulse to be applied by way of a selected coupling
diode
68
is
con‘
supply voltage. The anode ‘I6 of
condenser 36, 31 or 38 to the control electrode
nected to the anode 30 of tube III, while the oath
42 of tube 12. This negative impulse then increases
ode ‘I8 element is connected to the movable con
the bias on tube I2, decreasing cathode current
tact of the potentiometer ‘I2. The cathode 86 of
of tube I2, reducing voltage drop across resistor
diode ‘I0 is connected to the anode '58 of tube I2,
I6, which decreases bias on tube I0. This in
40
while .the anode 82 of ‘diode ‘I0 is connected to
creases current through tube I0, which causes
the movable contact of potentiometer ‘I4. The
further change in potential of anode 36 in a nega
diode ‘I0 operates primarily to assure a continued
.tive
direction, with the result that tube I2 is
conducting condition of tube I2 to maintain tube
rendered non-conducting, and the selected con
I0 substantially non-conducting in the absence
denser 54, 55 or 56 is permitted to charge through
of any triggering or synchronizing impulses, and
resistances 62 and 64.
to limit the amplitude of excursion of anode 56 in
In the absence of any circuit elements, the
the negative direction (less positive). Further
selected condenser would naturally charge to the
more, the diode 68 causes the e?ective gain of
full potential applied to terminal 32 in the length
tube III to be reduced to a very low value during
of time determined by the time constant of the
its periods of substantial inactivity. With the 50 circuit, but considerably before any such charge
diodes 68 and ‘I3 included in the circuit, the op~
condition has been reached, tube I2 is again ren
eration of the single sweep arrangement herein
dered conductive to discharge the selected con
described will now be discussed.
denser. As is well known tothose skilled in the
In describing the operation of the system it will
art, the charging of a condenser through a resist
be assumed that the selected one of the condensers .
54, 55 or 56 has been discharged by conduction
through tube I2, and that the tube is maintained
in a conducting condition by reason of the pres
ence of the diode ‘H3. The resistance values of the
resistance 62 and the potentiometer 64 is fairly
high and, as a result, if the diode ‘It! were not
included in the circuit, the potential of the anode
of tube I2 would drop to a, relatively low amount
determined primarily by the impedance of the
tube I2.
It will be noticed, however, that the
anode of the diode ‘I6 is connected to a movable
contact along the potentiometer 14 which main
tains the anode 82 of the diode ‘I0 at a predeter
mined and adjustable positive potential relative
to ground.
As soon as the anode 58 of tube l2 drops below
this positive potential, the cathode 80 of the diode
‘I6 then becomes negative with respect to the
anode 62 and current is permitted to ?ow through
the diode 10. This, in effect, forms a parallel
ance is approximately linear for a time interval
small compared to l/RC, and for producing linear
de?ections of a cathode ray it is desirable to not
permit the condenser to operate appreciably be
yond the substantially linear portion of its charge
curve. The length of time that the selected con
denser 54, 55 or 56 is permitted to charge is then
determined by the value of resistances 46 and
68, the latter of which is made adjustable.
During the charge of the selected‘ condenser
54, 55 or 56, the control electrode ‘42 of tube I2,
which was driven in a negative direction (be
yond cut-01f) by the impulse from tube In, grad
ually changes its potential in a postive direction
by reason of a discharge of the selected con
denser 3'6, 31 or 38 through resistances 46 and
48 thereby reducing the bias on tube I2. ‘After
the control electrode potential of tube I2 has
changed in a positive directionby a predeter
mined amount, the tube I2 is again rendered
7
2,412,542
conductive and a regenerative cycle occurs the
reverse of that described above, which culminates
in the control electrode Q2 of tube l2 being driven
to zero bias, or slightly positive. Tube l2 then
begins to discharge the selected condenser 56, 55
or 56. As stated above, the length of time that
grid 42 is negative beyond cut-off is determined
by the time constant of resistances 4E and 68'
together with the particular selected ‘condenser
38, 31 or 38.
After tube I2 has been rendered conductive, the
selected condenser 54., 55 or 53 is then discharged
and in the absence of a further triggering or syn
chronizing impulse, tube i2 remains conductive
and the selected condenser remains discharged.
The circuit remains in this quiescent condition
until a further positive triggering impulse is ap
plied to tube iii, and upon such an application
the cycle is again repeated.
Since the selected condenser 5:1, 55 or 55 is only
permitted to charge to a small percent-age of the
potential applied to terminal 32, and since the
particular condenser is discharged substantially
instantaneously through tube 112, a sawtooth
shaped voltage variation may be derived between
the anode of tube l2 and a point of ?xed potential.
Accordingly, potential variations of sawtooth
wave form may be obtained from terminal 65.
The slope of the produced ‘sawtooth wave, as well
as its time duration, may be determined by proper ‘
selection of the condensers by means of the se
8
immediately in condition to begin its useful de
?ection across the screen of the viewing tube as
soon as a triggering impulse is applied. In the
usual single sweep de?ection circuit, the applica
tion of a synchronizing or triggering impulse ?rst
causes the usual return of the cathode ray beam
which is immediately followed by the useful de
?ection stroke. In the present invention, how
ever, the application of a triggering or synchro
10 nizing impulse ?rst causes the useful traversal or
de?ection of the cathode ray beam which is im
mediately followed by the return de?ection stroke.
The application of a triggering or synchroniz
ing impulse in the present invention, therefore,
does not ?rst result in a discharge of the sweep
condenser, as is the usual case, but instead im
mediately results in the charging of the sweep
condenser, the charged condition being imme
diately followed by the discharge cycle, at which
point the system remains inactive until a ‘further
triggering or synchronizing impulse is applied.
For this reason there is no time delay in the im
mediate presentation of the oscilloscope trace,
and since the de?ection circuit described herein
will respond to very low intensity triggering im
pulses, it is possible to produce on the screen of
the cathode ray oscilloscope an entire transient
condition even though the initial portion of the
transient condition is of low amplitude. Fur
thermore, should the transient condition persist
for a very short length of time, the entire tran
lector switches 426 and 60 which are preferably
ganged together, and a Vernier or ?ne adjust
ment of the slope and time duration may be
sient condition is still presented on the screen
of the oscilloscope by reason of the fact that no
accomplished by a variation in the values of the ‘
condition is consumed in the return de?ection of
resistances 48 and 64, the controls for these values
being also preferably ganged together. The sig
portion of the time occupied by the transient
the cathode ray beam.
Various alterations and modi?cations may be
nal output intensity from terminals 56 and the
made in the present invention without departing
linearity of wave form remain substantially con
from the spirit and scope thereof, and it is desired
stant regardless of the chosen sweep rate.
so that any and all such alterations and modi?ca
By means of the circuit varrangement and the
tions be considered within the purview of the
controls associated therewith, it is therefore possi
ble to produce potential variations suitable for
de?ecting a cathode ray beam in a linear manner,
the rate of sweep being controlled within wide
limits so that the cathode ray beam may be caused
to traverse a screen relatively slowly or very rap
idly, the traversal being maintained substantially
linear regardless of the particular rate.
Since the circuit arrangement described is not
periodic in operation, but is instead aperiodic,
these voltage variations of sawtooth wave form
are not regularly recurrent but are produced only
as a result of the application of a positive trigger
ing or synchronizing impulse to the control elec
trode o1" tube I ii. The circuit shown can, however,
conveniently be vconverted to a periodic sweep
generator by merely changing the value of the
resistance I 6. Under such conditions the diodes
88 and 10 are not necessary.
Due tothe critical biasing ‘of tube iii and the
presence of diode 68, a very low intensity trigger
ing or synchronizing impulse is eifective to cause
operation of the circuit and thereby to produce
a voltage variation for de?ecting ‘the cathode ray
beam in order that an oscillographic trace of a
transient condition may be produced.
From the above description it may be seen,
therefore, that the present invention differs from
usual single sweep de?ection arrangements in
that a voltage variation for de?ection is produced
such that the cathode ray beam of the tube is
normally biased in a position at the starting side
(generally the left hand side) of the viewing
screen. Under these circumstances, the beam is
present invention, except as limited by the here
inafter appended claims.
Having now described my invention, what I
claim is:
1. A circuit arrangement for producing single
sweep de?ection voltage variations for a cathode
ray oscilloscope in response to individual trig
gering impulses comprising a ?rst and second
electron discharge tube each having a cathode, a
control electrode and an anode, means including
a common impedance element for connecting the
cathodes of the tubes to a point of ?xed poten
tial, and means for applying the triggering im
pulses to the control electrode of the ?rst elec~
tron discharge tube, means including a load im
pedance for maintaining the anode of the first
electron discharge tube positive with respect to
its associated cathode so that potential varia
(30 tions are present at the anode of said tube in
response to the applied triggering impulses,
means for coupling the anode of said ?rst elec
tron discharge tube to the control electrode of
said second electron discharge tube, means in
cluding an adjustable resistance for maintaining
the anode of the second electron discharge tube
positive with respect to its associated cathode, a
condenser connected between the anode of the
second electron discharge tube and a point of
?xed potential so that the condenser may be
charged through the resistance associated with
the second electron discharge tube and so that
the condenser may be discharged by said second
electron discharge tube in response to potential
variations applied to the control electrode of said
16
tube from said ?rst electron discharge tube, a
?rst diode including a cathode and an anode,
means for connecting the anode of said ?rst diode
to the anode of said ?rst electron discharge device,
and means for applying a predetermined positive
potential to the cathode of said ?rst diode so that ~
said ?rst electron discharge tube may be main
tained in a substantially non-conducting condi
tion in the absence of a positive triggering im
pulse, a second diode including a cathode and an
anode, means for connecting the cathode to the
for vmaintaining the anode of the ?rst electron
discharge tube positive with respect to its asso
ciated cathode so that potential variations are
present at the anode of said tube in response to
the applied triggering impulses, means for ap
plying the produced potential variations to the
control electrode of said second electron dis
charge tube, means including a load resistance
for maintaining the anode of the second electron
discharge tube positive with respect to its asso
ciated cathode, an electron storage element con
nected between the anode and the second electron
discharge tube and a point of ?xed potential 50
means for applying a predetermined positive po
that the electron storage element may be charged
tential to the anode of said second ‘diode in order
through the load resistance associated with the
to maintain a conductive condition of said second
second electron discharge tube and discharged by
electron discharge tube in the absence of applied
said second electron discharge tube in response
potential variations whereby single sweep poten
to potential variations applied thereto, a ?rst uni
tial variations may be produced at the anode of
lateral conducting device effectively connected
said second electron discharge tube in response
to the application of a, triggering impulse to the 20 in parallel withvthe said load impedance so that
said ?rst electron discharge tube may be main
?rst electron discharge tube.
tained in a substantially non-conducting condi
2. A circuit arrangement for producing single
tion in the absence of a positive triggering im
sweep de?ection voltage variations for a cathode
pulse, a second unilateral conducting device e?ec
ray oscilloscope in response to individual trig-_
tively connected in parallel with the said load
gering impulses comprising a ?rst and second
resistance in order to maintain conducting con
electron discharge tube each having a cathode, a
dition of said second electron discharge tube in
control electrode and an anode, means includ
the absence of the potential variations produced
ing a common impedance element for connecting
at the ?rst electron discharge tube whereby single
the cathodes of the tubes to a point of ?xed po
tential, means for applying the triggering im 30 sweep potential variations may be produced at
the anode of said second electron discharge tube
pulses to the control electrode of the ?rst electron
in response to the application of‘ a triggering
discharge tube, means for maintaining the anode
impulse to the ?rst electron discharge tube.
of the ?rst electron discharge tube positive with
4. A single sweep de?ection generator includ
respect to its associated cathode so that potential
ing a ?rst and second electron discharge tube
variations are present at the anode of said tube in
each including a cathode, a control electrode and
response to the applied triggering impulses, means
an anode, means including a common cathode
for applying the produced potential variations to
impedance for connecting the cathodes of the
the control electrode of said second electron dis
tubes to a point of ?xed potential, means in
charge tube', means including a resistance for
cluding a load impedance for maintaining the
maintaining the anode of the second electron dis
anode of the ?rst electron discharge tube positive
charge tube positive with respect to its associated
with respect to its cathode, means for applying
cathode, an electron storage element connected
triggering potentials extending in a positive di
between the anode of the second electron dis
rection to the control electrode of the ?rst elec
charge tube and a point of ?xed potential so
tron discharge tube to produce corresponding
that the electron storage element may be charged
; potential variations extending in a negative di
through the resistance associated with the sec
rection at the anode of said tube, means to assure
ond electron discharge tube and discharged by
a substantially non-conducting condition of the
said second electron discharge tube in response
?rst electron discharge tube in the absence of
to potential variations applied thereto, a ?rst
a triggering impulse comprising a diode having
unilateral conducting device including a cathode
anode of said second electron discharge tube, and
and an anode, means for connecting the anode 50 an anode and a cathode, means for effectively
connecting the diode in parallel with the load
of said ?rst unilateral conducting device to the
impedance of the ?rst electron discharge tube,
anode of said ?rst electron discharge device, and
means including an adjustable resistance for
means for applying a predetermined positive po
maintaining the anode of the second discharge
tential to the cathode of said ?rst unilateral con
ducting device, a second unilateral conducting 55 tube positive with respect to its cathode, a con
denser connected between the anode of said sec
device including a cathode and an anode, means
ond tube and a point of ?xed potential, so that
for connecting the cathode to the anode of said
the condenser may be charged through said ad
electron discharge tube, and means for applying a
justable resistance and discharged by said sec
predetermined positive potential to the anode of
ond tube in response to the application of the
said second unilateral conducting device whereby
voltage variations from said ?rst electron dis
single sweep potential‘ variations may be produced
charge tube to the control electrode of saidsec
at the anode of said second electron discharge
ond electron discharge tube, and means to assure
tube in response to the application of a trigger
a conducting condition at said; second electron
ing impulse to the ?rst electron discharge tube.
3. A circuit arrangement for producing single 65 discharge tube in the absence of an applied
potential variation to the control electrode of
sweep de?ection voltage variations for a cathode
ray oscilloscope in response to individual trigger
saidtube comprising a diode having a cathode
ing impulses comprising a ?rst and second elec
and an anode, and means for connecting the
tron discharge tube each having a cathode, a
diode effectively in parallel with the adjustable
control electrode and an anode, means including
resistance whereby the condenser will be charged
a common impedance element for connecting the
through said resistance to a predetermined po
cathodes of the tubes to a point of ?xed poten
tential level and immediately be discharged by
tial, means for applying the triggering impulses
said second electron discharge tube in response
to the control electrode of the ?rst electron dis
charge tube, means including a load impedance 75 to the application of a single triggering impulse
2,412,542
1l
12
to the control electrode of the ?rst electron dis
charge tube to produce single sweep potential
variations at the anode of said second tube.
5. A single sweep de?ection generator includ
ing a ?rst and second electron discharge tube
charge tube in response to the application of a
single triggering ilnpulse to the control electrode
of the ?rst electron discharge‘ tube thereby to
produce a single sweep potential variation at the
each including a cathode, a control electrode
anode of said second tube.
and an anode, means including a common cath
7. A single sweep de?ection generator includ
ing a ?rst and second electron discharge tube,
ode impedance for maintaining the cathode of
the tubes at substantially the same poten
mediately discharged by said second electron dis
each tube including a cathode, a control elec
tial, means including av load impedance for 10 trode and an anode, means for maintaining the
maintaining the anode of the ?rst electron dis
charge tube positive with respect to its cathode,
means for applying triggering potentials extend
cathodes at substantially the same potential in
cluding a common impedance for connecting the
cathodes to a point of ?xed potential, means for
ing in a predetermined direction to the control
applying individual triggering impulses to the
electrode of the ?rst electron discharge tube, to 15 control electrode of the ?rst electron discharge
produce potential variations at the anode of said
tube to produce potential variations at the anode
tube, means to normally assure a substantially
of said tube, means for applying the produced
non-conducting condition of the ?rst electron
potential variations to the control electrode of
discharge tube comprising a diode, means for
the second electron discharge tube, means includ
effectively connecting the diode in parallel with 20 ing an adjustable resistance for maintaining the
the load impedance of the ?rst electron discharge
anode of the second electron discharge tube pos
tube, means including a resistance for maintain
itive with respect to its associated cathode, a con
denser connected between the anode of the sec
ond electron discharge tube and a point of ?xed
ing the anode of the second discharge tube posi
tive with respect to its cathode, a condenser con~
nected between the anode of said second tube
potential whereby the condenser may be relatively
and a point of ?xed potential so that the con
slowly charged through theadjustable resistance
denser may be charged through said resistance
and quickly discharged by said second electron
and discharged by said second tube in response
discharge tube, a. ?rst and second unilateral con“
to the application of the produced voltage varia
ducting- device individually associated with- the
tions to the control electrode of said second elec 30 anode circuit of the electron discharge tubes to
tron discharge tube, and means to normally
assure a normally substantially non-conducting
assure a conducting condition at said second elec
condition of the ?rst electron discharge tube and
tron discharge tube comprising a diode, and
a normally conducting condition of the second
means for connecting the diode effectively in
electron discharge tube so that upon the applica
parallel with said resistance whereby the con
tion of an individual triggering impulse to the
denser will be gradually charged to a predeter~
control electrode of the ?rst electron discharge
mined potential level and immediately quickly
tube the said condenser will be charged to a pre
discharged by said second electron discharge tube
determined potential value and will be immedi
in response to the application of a single trigger
ately discharged by said second electron dis
ing impulse to the control electrode of the ?rst
charge tube thereby assuring aperiodic operation
electron discharge tube to produce single sweep
of the circuit to produce single sweep potential
potential variations at the anode of said second
variations at the anode of the second electron
tube.
discharge tube in’ response to applied triggering
6. A single sweep de?ection generator includ
impulses to the ?rst electron discharge tube.
ing a ?rst and second electron discharge tube
3. A single sweep de?ection generator including
each including a cathode, a control electrode and
a ?rst and second electron discharge tube, each
an anode, means includin‘r a common cathode
impedance for connecting the cathodes of the
tubes to a point of ?xed potential to maintain
the cathodes at substantially the same potential
means including a load impedance for maintain
ing the anode of the ?rst electron discharge tube
positive with respect to its cathode, means for
applying a triggering potential to the control elec
tube including a cathode, a control electrode and
an anode, means for maintaining the cathodes of
said tubes at substantially the same potential,
means for applying‘ individual and sporadic trig
gering impulses. to the control electrode of the
?rst electron discharge tube to. produce potential
variations at the anode of said tube, means for
applying the produced potential variations to the
control electrode of the second electron discharge
tube, means including an adjustable impedance
for maintaining the anode of the second electron
discharge tube positive with respect to its associ
charge tube positive with respect to its cathode,
ated cathode, a condenser connected between the
a condenser connected between the anode of said
60 anode of the second electron discharge tube and
second tube and a point of ?xed potential, so that
a. point of ?xed potential whereby the, condenser
the condenser may be relatively slowly charged
trode of the ?rst electron discharge tube to pro
duce a corresponding potential variation at the
anode of said tube, means including a resistance
for maintaining the anode of the second dis
through said resistance and quickly discharged
may be relatively slowly charged through the ad~
justable impedance andsubstantially. instanta
by said second tube in response to the application
of the produced voltage variation to the control
neously dischargedv by said second electron dis
electrode of said second electron discharge tube, 65 charge tube, a ?rst and second unilateral con
and means to assure aperiodic operation of the
ducting device individually associated with the
de?ection generator and to normally maintain
anode circuit of the electron discharge tubes to
a conducting condition at said second electron
normally assure a substantially non-conducting
discharge tube in the absence of an applied po 70 condition of the ?rst electron discharge tube and
tential variation to the controlelectrode of said
a normally conducting condition of the second
tube comprising a diode, and means for effective
electron discharge tube thereby assuring aperi
ly connecting the diode in parallel with the re
odic operation of the de?ection generator to pro
sistance whereby the condenser will be charged to
duce a single sweep potential variation cycle at
a predetermined potentiallevel and will be im 75 the anode of the second electron discharge tube
2,412,542
,
a
,
13
14
discharged by said second electron discharge tube
in response to each applied triggering impulse to
the ?rst electron discharge tube.
9. A single sweep de?ection generator includ
to produce a single sweep de?ection cycle across
said condenser.
ing a ?rst and second electron discharge tube,
each tube including a cathode, a control elec
trode and an anode, means for maintaining the
cathodes at substantially the same potential,
means for applying a triggering impulse to the
cluding an anode, a control electrode and a cath
10. A single sweep de?ection generator includ
ing a pair of electron discharge tubes each in
ode, means for applying triggering impulses eX
tending in a predetermined potential direction to
the control electrode of one of said tubes to pro
control electrode of the ?rst electron discharge
tube to produce a corresponding potential varia 10 duce a voltage variation extending in a prede
termined direction, means to maintain the oath
tion at the anode of said tube, means for apply
odes of the two tubes at substantially the same
ing the produced potential variation to the con
potential, means to apply the produced voltage
trol electrode of the second electron discharge
variations to the control electrode of the other
tube, means including an impedance for main
taining the anode of the second electron dis 15 electron discharge tube, a condenser connected
between the anode of the said other electron dis
charge tube positive with respect to its associ
charge tube and a point of ?xed potential, an
ated cathode, a condenser connected between the
adjustable charging resistance and source of pos
anode of the second electron discharge tube and
itive potential associated with said condenser so
a point of ?xed potential whereby the condenser
may be slowly charged through said impedance 20 that the condenser may be gradually charged
through said resistance and quickly discharged
and quickly discharged by said second electron
by said other electron discharge tube in response
discharge tube, a unilateral conducting device ef
to an applied voltage variation, means including
fectivzely connected in parallel with said imped
a unilateral conducting device effectively con
ance to assure aperiodic operation and to nor
nected in parallel with the anode circuit of each
25
mally maintain a conducting condition of the
electron discharge tube to assure aperiodic oper
second electron discharge tube so that upon the
ation of the deflection generator so that the con
application of a triggering impulse to the con
denser is charged and immediately discharged
trol electrode of the ?rst electron dischargetube
upon the application of each individual trigger
the condenser associated with said second elec
tron discharge tube will be charged to a prede 30 ing impulse.
LESTER C. SMITH.
termined potential level and will immediately be
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