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Патент USA US3092760

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June 4, 1963
R . W. WO LFE
DRIVE CIRCUIT FOR ELECTRONIC COUNTERS WITH
MEANS TO PREVENT SPURIOUS SWITCHING
3,092,752
Filed May 23, 1960
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INVENTOR;
BY
ROGER W WOLFE
Mada-�44
ATTORNEY
i
3,092,752?
Patented June 4, 1963
2
between adjacent spade electrodes. Each spade electrode
3,092,752
�511 MEANS TO PREVENT SPURIOUS SWITCH
DRIVE CIRCUIT FOR ELECTRONIC COUNTERS
Roger W. Wolfe, South Plain?eld, NJ., assignor to Bur
roughs Corporation, Detroit, Mich., a corporation of
Michigan
Filed May 23, 1960, Ser. No. 30,966
4 Claims. (Cl. 315?8.5)
This invention relates to drive circuits for electronic
counting circuits and particularly to counting circuits us
ing multi-position electron beam tubes as the basic count
serves to form and hold an electron beam on its corre
ponding target electrode. A generally rod-like switching
electrode 20 is also included in each group ?of electrodes
and is positioned between one edge of each target elec
trode and the adjacent spade electrode. The switching
electrodes are known as switching grids. An open-ended
cylindrical permanent magnet represented schematically
at 22 is provided surrounding the tube envelope and
The magnet 22 provides an axial
magnetic ?eld which is utilized in conjunction with elec
10 coaxial therewith.
tric ?elds within the tube to form and switch an electron
beam from the cathode to each of the groups of electrodes.
ing unit.
The direction in which the beam switches, that is clock
One type of electronic counter utilizes a multi-position 15 wise or counterclockwise, is always the same and is deter
mined by the orientation of the electric and magnetic
magnetron beam switching tube which includes an elec
?elds.
trode assembly comprising a central cathode and a plural
Brie?y, in operation of tube 10?, electrons emitted by the
ity of groups of electrodes surrounding the cathode.
cathode are retained at the cathode if each of the spades,
Each of the groups of electrodes comprises a position to
which an electron beam may ?ow and from which an out 20 targets and switching grids carries its normal operating
electrical potential. When a spade or swiching grid
experiences a suitable lowering of its potential, an electron
beam is formed and directed to the corresponding target
electrode. The electron beam may be switched from one
switching action. According to one method of operation,
a ?ip-?op is employed to drive an electron beam from 25 target electrode to the next by thus suitably altering the
electrical potentials of a spade or switching grid. Under
position to position in the tube. However, it has been
put signal may be derived. Suitable magnet means pro
vides a longitudinal magnetic ?eld which combines with
electronic ?elds within the tube to provide the desired
found that, under some circumstances, for example where
the ?ip-?op is plate-triggered, or when the ?ip-?op is
changing state, undesired or spurious switching of the
tube occurs.
Accordingly, the principles and objects of the present
invention are directed toward the provision of an improved
normal operating conditions, whenever electrode voltages
are such that a beam might be supported at several posi
tions, the beam will switch to the?most leading position
30 and lock in at this position.
In the circuit shown, the cathode 14 is connected
through a suitable bias resistor 24 to ground. Each of
driving circuit for a multi-position beam switching tube
wherein spurious switching of the tube is prevented.
the spade electrodes 16 is coupled through a spade load
tron beam on its associated target electrode, and a switch
ing electrode which is used to switch a beam from one
position to the next. The switching electrodes are con
nected in two sets, with alternate electrodes being con
position. A typical zero-set circuit operates by ?rst reduc
resistor 26 to a spade buss 28. The spade buss 28 is
Brie?y, the circuit of the invention includes a mgnetron 35 coupled through a common spade resistor 30- to a suitable
positive DC. power supply VS of about 200 volts. -A suit
beam switching tube of the type described above in which
able zero-set circuit 32 for clearing an electron beam in
each group of electrodes includes a target electrode to
the tube and resetting it at the ?0? position is coupled
which an electron beam flows and from which an output
to the spade buss 28 and the spade electrode 16 at the ?0?
signal is derived, a spade electrode which holds an elec
ing the potential of the spade buss to a level at which a
beam cannot be maintained at any position and then
holding the ?0? spade at a lower voltage level than the
other spades until a beam forms at the ?0? position.
nected together, and a driving circuit is coupled to the
sets of switching electrodes. The driving circuit is of a 45 Of course, any ?desired and suitable zero-set arrangement
may be used.
type which may generate transient pulses which may
The target electrodes 18 are connected through suitable
cause spurious switching of the tube. According to the
load resistors 38 to a common target buss 49 which is
invention, means are provided for rendering the tube more
coupled to a positive DC. power supply VT of about 300
di??icult to switch [during the period when the driving
volts. In addition, an auxiliary output tap 42 is provided
eans might generate transient pulses and before the
at each target for connection to a suitable utilization device
desired stable switching state has been reached. After
this time has passed, the stable, steady-state pulses gen
such as an indicator tube, a printing mechanism 'or the
erated by the driving circuit cause the desired and normal
like, if desired.
switching operation.
The switching grid electrodes 28 are connected in two
The invention is described in greater detail by refer 55 sets, with the grids at the even-numbered positions con
nected together in one set and the grids at the odd-num
ence to the drawing wherein the single FIGURE is a
bered positions connected together in another set.
schematic representation of a counting tube and a circuit
Apparatus for driving the beam switching tube and
in which it may be operated according to the invention.
The circuit described below is particularly suitable for 60 switching an electron beam from position to position in
cludes a source 44 of switching signals (negative pulses)
use with a multi-position type 6700 magnetron beam
which is coupled through a capacitor 45 to the plate elec
switching tube. In actual construction, this type of tube is
trodes of a conventional ?ip-c?op circuit 46. The signal
cylindrical in form but is shown schematically in linear
source is thus adapted to plate-trigger the ?ip-?op circuit.
form as tube It) in the drawing. The tube includes an enve
lope 12 which contains a central longitudinally elongated 65 This method of driving a ?ip-?op is well known, and the
elements of a typical ?ip-?op are shown without being
cathode 14- and ten groups of electrodes spaced radially
described in detail. The ?ip-?op includes two output
equidistantly from the cathode and surrounding the
leads 4S and 50, one of which is connected to the input
cathode. For simplicity, only four groups of electrodes
of a cathode follower circuit 52, the output of which is
?are shown numbered ?0,? ?1,? ?8,? and ?9.? Each group
coupled by lead 53 to one of the sets of switching elec
of electrodes includes a generally U-shaped elongated 70 trodes and the other of which is connected to the input
spade electrode 16 and a generally L-shaped target elec
of a cathode follower 54, the output of which is connected
trode 18 positioned so that each target occupies the space
by lead 55 to the other set of switching electrodes. The
3,092,752
3
4
cathodefollower circuits are conventional and are not
ing said beam'tube temporarily di?icult to switch during
shown in detail. According to the invention, the signal
source, in addition to being coupled to the plates of the
?ip-?op circuit 46, is also coupled through a capacitor 56
to the spade buss 28. The capacitor thus is? adapted ,to
couple a portion of the input switching signal to the
the time when said ?ip-?op is changing states to provide
desired steady-state switching of the tube.
spade buss.
.
2. A counter circuit including an electron beam switch
ing tube having a cathode and a plurality of groups of
electrodes;
.
.
~
-
each group of electrodes including a target electrode
>
In operation of the invention, when a switching pulse is
which receives an electron beam and produces an out
applied from the signal source 44 to the plate circuit of
the ?ip-?op 46, the same negative pulse is transmitted in
part to the spade buss 28. Thus, the spade buss is
put signal therefrom, a spade electrode which holds
10'
an electron beam on its associated target electrode,
lowered in potential by about 25 volts. This reduction
and a switching electrode which serves to switch an
electron beam from one group of electrodes to the
in potential of the spade buss makes it more dif?cult to
switch an electron beam during the short time in which
the ?ip~?op and- the cathode followers are changing state.
drive circuit means coupled- to said tube for applying
Thus, spurious switching during this time due to transient
causing an electron beam to switch from position to
pulses or the like is prevented and desired switching occurs
when these components have completed their change in
state and the proper stable, steady-state switching pulse is 7 '
applied to the appropriate switching electrode. 7
20
next;
.
.
steady-state stable switching pulses't-hereto and thus
position;
_
-
and auxiliary circuit means coupled from said drive
circuit means to said spade electrodes and applying
a small negative potential thereto for rendering said
tube. temporarily dii?cult to switch whereby transient
pulses from said drive circuit do not cause spurious
In operation of the invention, the magnitude of the
switching pulses applied to the ?ip~?op from the source
switching.
44 is deter-mined by the requirements of the ?ip-?op. In
3. A circuit de?ned in claim 2 wherein said drive cir
addition, the magnitude of the pulse coupled to the spade
buss should be large enough only to resist spurious switch 25 cuit means is coupled to the switching electrodes of said
tube.
ing and should not be so large that the tube is cleared.
4. A counter circuit including an electron beam switch
It is clear that the principles of the invention, whereby
spurious switching of an electron beam is prevented, may
ing tube having a cathode and a plurality of groups of
be practiced where appropriate with other types of driving ? electrodes; each group including a target electrode which
circuits and the invention is not limited to plate-driver 30 receives an electron beam and produces an output signal
therefrom, a spade electrode which holds an electron beam
on its associated target electrode, and a switching elec
What is claimed is:
trode which serves to switch an electron beam from one
1. A counter circuit including a magnetron閠ype elec- - ' group of electrodes to the next; said switching electrodes
being connected in two sets with alternate electrodes being
tron beam switching tube having a cathode and a plurality
connected together; circuit driving means coupled to said
of' groups of electrodes; each group including a target
electrode which receives an electron beam and produces
sets of switching electrodes; and driving signal input means
coupled both to said circuit driving means and to the spade
an output signal therefrom, a spade electrode which holds
electrodes of said beam switching tube whereby a portion
an electron beam on its associated target electrode, and a
switching electrode which serves to switch an electron 40 of the driving signal is coupled to the spade electrodes
of said tube and renders the tube di??icult to switch during
beam from one group of electrodes to the next; means
a portion of the time when said circuit driving means is
providing a longitudinal magnetic ?eld in said tube; said
energized by said driving signal.
switching electrodes being connected in two sets with
?ip-?ops or ?ip-?ops operated with cathode follower
circuits.
7
'
alternate electrodes? being connected together; ?ip-?op
driving means coupled to said sets of switching electrodes; 45
and switching signal input means coupled both to said
?ip-?op and to the spade electrodes of said beam switching
tube whereby a switching signal is applied to said ?ip-?op
and to said beam tube at the same time; said signal render
References Cited in the ?le 'of this patent
UNITED STATES PATENTS
' 2,856,558
2,999,183
Cola ________________ __ Oct. 14, 1958
Glaser ________________ .._ Sept. 5, 196-1
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