close

Вход

Забыли?

вход по аккаунту

?

код для вставки
' Oct. 29, 1946.
2,410,156
1.. E. FLORY
ELECTRONIC TIMING DEVICE
F1‘ led Nov. 26, 1942
2 Sheets-Sheet l
lllu
‘All
7111'
ll"
:nwentor
Qttorncg
Oct. 29, 1946.
L. E. FLORY
2,410,156
ELECTRONIC TIMING DEVICE
Filed Nov. 26, 1942
2 Sheets-Sheet 2
F292.
®@@@@@@@@@@@
0000007
07300000000
0000000000000000000000000000000
l
I
I
l
/
attorney
2,410,156
Patented Oct. 29, 1946
UNITED STATES ‘PATENT orrica
2,410,156 '
ELECTRONIC TIMING DEVICE
Leslie E. Flory, Princeton. N. 1., asslgnor to Radio
Corporation of America, a corporation of Dela
ware
Application November 26, 1942, Serial No. 461,032
'lClalma. (CI. 50-26)
1
2
This invention relates generally to timing de
vices and particularly to electronic timing devices
vacuum tube. A saving in the number of tubes
required for a given number is also possible in a
ratio of 3 to 1 over the scale of 10 system. More
complete discussions of the binary and similar
systems of computation may be found in “Ele
of a type which utilizes cascaded thermionic tube
trigger circuits operating from a source 0'! sub
stantially constant frequency alternating poten
tial.
mentary Number Theory" by Uspenskl and Heas
let, "Mathematical Excursionswby H. A. Merrill,
The basic circuit utilized in adapting the in
and "A Mathematician Explains" by M, I.
vention herein to the various circuits to be de
Logston.
scribed is the well known "trigger" circuitof the
general type described in “Theory and Applica 10 In order to operate a counter utilizing the bi
nary system, it is necessary to adapt the above de
tion of Vacuum Tubes" by Herbert J. Reich. In
scribed trigger circuit to eilect a reversal in D0
one of its simplest forms, this trigger circuit in
larization or activization by succeeding implied
cludes two triodes in which the grid of the ?rst
pulses of a similar nature. The circuits, herein
triode is coupled to the anode of the second trlode
through a network comprising a parallel con 15 after described, are adapted to this purpose by
applying in a symmetrical manner negative oper
nected resistor and capacitor, and the grid of the
ating pulses to the anode circuits of the trigger
second triode is similarly coupled to the anode of
tubes.
the ?rst triode through a similar coupling net
The instant invention is an improvement upon
either directly, or through suitable cathode re 20 the copending application of George A. Morton
and Leslie E. Flory, Ser. No. 464,292, ?led Novem
sistors. Grid and anode potentials are applied
ber 2, 1942, entitled "Electronic Computing De
to the respective electrodes through separate re
vices." This copending application describes a
sistors. If desired, a gaseous discharge tube may
simple counter utilizing a plurality of cascaded
be connected across one of the anode resistors to
work. The cathodes of both triodes are grounded. .
indicate circuit operation.
In operation, if a negative voltage is applied
thermionic tube trigger circuits\of the general
‘type described heretofore in which carryover
pulses are transmitted from each trigger circuit
to the grid of the ?rst triode, the anode current
to a symmetrical common point in the anode
of the triode will be reduced, and the anode po
circuits of the next succeeding trigger circuits.
tential will become more positive. Due to the
connection through the coupling resistor. the grid 80 The operation of such a carryover system is de
scribed in detail in the copending application of
potential of the second triode will become more
George A, Morton and Leslie E. Flory, Ser. No.
positive, causing an increase in the anode cur
464,293, ?led November 2, 1942.
rent of the second triode, with a resultant de
The present invention differs from the said
crease in the second triode anode potential. This‘
decrease in anode potential willI in turn; cause 35 copending applications in that an electronic
counter in the scale of 64 is adapted to count
the grid potential of the ?rst triode to become
pulses in the scale of 60 by means of a novel
more negative. This action will continue until
feedback arrangement. A pulse counter in the
the anode current of the ?rst triode is cut off.
scale of 64 may be provided by cascading seven
The ?rst triode will remain cut oil, and the sec
ond triode will remain conducting, until a posi 40 thermionic trigger circuits by means of capacitors
coupling the output of one tube of each trigger
tive potential is applied to the grid of the ?rst
circuit to a common symmetrical point in the
triode or until a negative potential is applied to
anode circuit of the next succeeding trigger cir
the grid of the second triode. In either latter in
cuit. In order to change the counter from the
stance, the tube operating conditions will be re
versed andthe ?rst triode will become conducting 45 scale of 64 to the scale of 60, a second capacitor
may be connected between the output of one of
and the anode current of the second triode will be
the tiibes of the last cascaded trigger circuit back
cut oil.
to the symmetrical common point in the‘anode
One of the features of the instant invention is
circuit of the third cascaded trigger circuit. This
the utilization of such trigger circuits in cascade
arrangement, whereby a predetermined change in '
the polarization or activization of one triode of
the trigger circuit will generate a pulse to trigger
or activate a succeeding trigger circuit in the cas
cade arrangement. As many trigger circuits as
desired may be connected in cascade.
The binary system of computation is particu
larly suited to electronic computers since a com
plete binary term of a‘binary number may be
expressed in terms of the conducting or cut-oi!
condition of the anode circuit of a conventional
arrangement will provide 'a-pulse which effec
tively impresses a count of 4 upon the trigger cir.
cuit each time the ?nal count of 64 is recorded
upon the last cascaded trigger circuit. It will
therefore be understood that 64 pulses will be re
quired to ?ll the counter on the ?rst operation,
but that only 60 will be required thereafter, This
incidental error may be compensated by applying
64 pulses to the circuit prior to using it for count
ing purposes, or by subtracting iour pulses from
the ?nal count. It should be understood that
2,410,156
.
>
3
1
feedback pulses may be impressed on more than
one intermediate trigger circuit. For example, if
the line frequency is 50 cycles, feedback pulses
correspondingtoiL4and2wouldberequiredto
derive one pulse persecond from acounterinthe
scale of ‘I.
is applied through a coupling capacitor 3 to the
symmetrical point I of the anode circuit of a
first thermionic trigger circuit I of the type de
scribed in detail heretofore. A second coupling
capacitor =5 is connected between the anode of
the second tube of the first trigger circuit I and
A clock may be constructed utilizing a counter
the symmetrical point 6 of the anode circuits of
in the scale of 60 of the type described heretofore ' a second trigger circuit II. Third, fourth, ?fth,
for converting 60 cycle line currents into one pulse
and sixth trigger circuits III, IV, V, and VI are
per second. The single pulse per second may be 10 connected respectively in cascade in the same
applied to a second counter in the scale of 60 to
manner to form-a counter in the-scale of 64. The
derive one pulse per minute. The one pulse per
carryover pulse from the anode circuit of the
minute may be applied to a third counter com
second tube of trigger circuit VI is applied to the
prising 60 cascaded trigger circuits, which in
control electrode-of the ?rst tube of a. seventh
cludes a gas discharge tube or other indicator in 15 trigger circuit VII. A third coupling capacitor
the anode circuit of one tube of each of the trigger
1 is connected between the anode of the first tube
circuits. As explained in the copending applica
of the seventh trigger circuit VII and the sym
t'ons. gas discharge tubes may be utilized as in
metrical point in the anode circuit of the third
dicators to indicate the minute count. One pulse
trigger circuit III whereby a pulse is fed back to
per hour will be derived from the minute counter 20 the third trigger circuit III each time the counter
and may be applied to a fourth, or hour, counter
is filled. It will therefor be understood that after
which includes twelve cascaded trigger circuits
the counter is once ?lled, only sixty pulses will
of theme general type.
be required to fill the counter thereafter.
Among the objects of the invention are to pro
Output pulses at the rate of one per second are
vide an improved method of and means for count 25 derived from the anode circuit of the second tube
ing voltage pulses. . Another object of the inven
of the sixth trigger circuit VI, and applied
t‘on is to provide a new and improved method of
through a. fourth coupling capacitor 8 to the sym
and means for providing an electronic timing
metrical point 9 of the anode circuits of an eighth
circuit for operation from a source of constant
frequency potentials. Another object is to pro
vide an improved method of and means for utiliz
ing groups of cascaded thermionic tu'be trigger
circuits for counting voltage pulses and indicating
the count in terms of time. Still another object
of the invention is to provide a new and improved
method of and means for counting voltage pulses
in which cascaded trigger circuits which normally
trigger circuit VIII. Additional trigger circuits
30 IX, X, XI, X11, and XIII, are connected in cascade
to trigger circuit VIII in the same manner as de
scribed heretofore for the trigger circuits I, II,
III, IV, V, and VI, inclusive. The carryover pulse
from the anode of the second tube of trigger cir
cuit XIII is applied to the control electrode of
the ?rst tube of a fourteenth trigger circuit XIV.
Similarly, feedback pulses are applied through a
?fth coupling capacitor [2 from the anode of the
provide a‘ counter in the scale of 64 are converted
to provide a counter in the scale of 60 by means
?rst, tube of trigger circuit XIV to the symmetri
of a novel feedback arrangement. Still another 40 cal point III of the anode circuits of the trigger
object of the invention is to provide an improved
circuit X. Pulses at the rate of one per minute
method of and means for counting voltage pulses
are derived from the anode circuit of the second
wherein the count is terminated when it attains
tube of trigger circuit XIII through an output
a predetermined value. Another object of the
coupling capacitor I I, which is connected thereto.
invention is to provide an improved method of
The seventh and fourteenth trigger circuits VII
and means for cascading two groups of thermi
and XIV are arranged to clear automatically after
onic trigger circuits wherein voltage pulses are
each actuation thereof. These trigger circuits
applied to a counter having a first predetermined
are of the “slideback” type, wherein a. pulse ap~
numerical scale, the count is then converted to
plied to the grid of the first tube changes the
a second numerical scale, the resultant count 50 polarization of the circuit for a predetermined
is applied to the second group of trigger circuits
interval, after which it returns to its one normal
which form a. counter in a third numerical scale,
or stable condition. The return of the circuit to
and the ?nal count is converted to a fourth nu
its stable condition provides a negative feedback
merical scale.
pulse to the preceding counter which pulse has
The invention will be described by reference
said predetermined delay, so as to prevent coin
to the accompanying drawings of which Figure
cidence with the counted pulse.
l is a schematic circuit diagram of two cascaded
counters, each in a scale 64 including feedback
means for converting the scale of each counter
to the scale of 60; Figure 2 is a schematic circuit
diagram of a portion of an electronic counter in
the scale of 60; ?gure 3 is a schematic circuit
diagram of a portion of an electronic counter in
the scale of 12; and Figures 4 and 5 are schematic
The minute pulses are then applied to the con
trol electrode circuit, see Fig. 2, of a third ampli
?er tube It, the output of which is connected
through a coupling capacitor I3 to the control
electrode of the second tube of the first trigger
circuit XX of a minute counter which includes
diagrams of typical indicators for adapting the
60 trigger circuits connected in cascade in the
manner described in the copending application
of George A. Morton and Leslie E. Flory, Ser. No.
counter circuits herein for use as an electronic
459,404, filed September 23, 1942, entitled “Elec
tronic computing devices." For purpose of illus
Referring to the drawings, Figure 1 includes a
tration, only three trigger circuits are shown.
?rst ampli?er tube I. A standard 60 cycle line
Indicator lamps M which may be in the form of
potential is applied to the control electrode of 70 gas discharge tubes, are connected across the
the ampli?er l. The output of the ?rst ampli?er
anode resistors of the second tube of each of the
I is applied to the second ampli?er tube 2 which
sixty cascaded trigger circuits which comprise the
distorts the conventional wave form of the 60
minute counter.
cycle potential to approximately square wave
Pulses at the rate of one per hour are derived
form. The output of the second ampli?er tube 2
from the anode circuit of the second tube of the
clock,
.
2,410,150
5
60th trigger circuit of the minute counter, and
applied to the input of a fourth ampli?er tube
I5, see Fig. 3, through a sixth coupling capacitor
l4. _ The output of the fourth ampli?er tube [5
may be applied in various other ways suggested
by the copending applications described hereto
fore.
I claim as my invention:
is applied to the control electrode of the second
tube of a ?rst trigger circuit XXX of the hour
counter which includes‘ twelve trigger circuits
1. A device including a plurality of trigger cir
cuit units, means connecting said units in cascade
with one another for establishing one cycle of
connected in cascade in the same manner as de
operation which is completed in response to a
scribed for the sixty trigger circuits of the minute
predetermined number of impulses applied to one
counter. Only three of these ‘trigger circuits are 10 of said units, and means interconnecting a part
shown in Fig. 3. Indicator lamps 20, 2|, 22 are
of said units in a closed circuit for establishing
provided for each of the trigger circuits of the
another cycle of operation which is completed
hour counter.
in response to a different number of said im
In the particular circuit arrangement illus
pulses.
trated in Figure 3, potentials are derived from
2. A device including a plurality of trigger cir
the grid circuit of the second tube of each of the
cuit units, means connecting said units in cascade
trigger circuits and applied to the control elec
with one another for establishing one cycle of op
trode of ?fth, sixth and seventh ampli?er tubes
eration which is completed in response to a pre
I1, l8 and I9, respectively. The output po
determined number of constant frequency im~
tentials derived therefrom are then applied to ac 20 pulses applied to one of said units, and means
tuate the indicator lamps 20, 2| and 22, respec
including a slide-back trigger circuit unit inter
tively. The ampli?ers provide the necessary ad
connecting a part of said units in a closed circuit
ditional power required for actuation of high
for establishing another cycle of operation which
power or supplementary indicators, as for ex
is completed in response to a different number of
ample, in a remotely operated clock circuit. It 25 said impulses.
should be understood that the indicators may
3. The combination of six trigger circuit units,
be operated in any other well known manner,
means connecting said units in cascade for es
and that, as illustrated, one ampli?er and one
tablishing one cycle of operation which is com
indicator lamp will be required for each of the
pleted in response to sixty-four impulses applied
trigger circuits of the hour counter.
to one of said units, and means interconnecting
Figure 4 is one arrangement of an electronic
clock face wherein small gas discharge tubes M
are arranged in a single straight line to indicate
minutes and a parallel row of larger gas dis
charge tubes H is disposed adjacent the ?rst row
of lamps to indicate hours. In the particular ar
rangement illustrated, the minutes read from
a part of said units in a closed circuit for estab
lishing another cycle of operation which is com
pleted in response to sixty of said impulses.
4. A device including a plurality of trigger cir
cuit units, means connecting said units in cascade
with one another for establishing one cycle of
operation which is completed in response to a
one to sixty, reading from left to right, and the
predetermined number of constant frequency im
hour scale reads from 7 to 12 and l to 6, reading
pulses applied to one of said units, and time de
from left to right.
40 lay means interconnecting a part of said units in
Figure 5 is a more conventional arrangement
a closed circuit for establishing another cycle of
of an electronic clock face, wherein the sixty
operation which is completed in response to a
minute indicators are arranged in the form of .a
different number of said impulses.
circle, while the twelve hour indicators are ar
5. A timing device including a ?rst group of
ranged in the form of a concentric circle of great 45 six trigger circuit units provided with means con
er diameter than the circle of minute indicators.
necting part of said units in a closed circuit to
It should be understood that the seconds may also
deliver a ?rst output pulse in response to sixty
be indicated by means of an additional group of
input pulses, a second group of similar trigger
sixty indicator lamps, or by means of a single
circuit units for delivering a second output im
indicator lamp which ?ashes once per second.
pulse in response to sixty of said ?rst output
The clock described may be utilized for en
pulses, a third group of sixty trigger circuit units
ergizing any selected load circuit at predeter
interconnected to deliver a third output pulse in
mined time intervals. For example, it may be
response to sixty of said second output pulses,
desirable to provide an arrangement which will
and a fourth group of twelve trigger circuit units
operate in one hour, thirteen minutes, ?fteen
interconnected to indicate a fourth output im
seconds, and twelve cycles. This may be accom
pulse in response to twelve of’ said third output
plished by connecting relays in any well known
impulses, and means for indicating said second
manner to energize the load when the particular
and said third output pulses.
combination of trigger circuit conditions coin
6. A timing device including a ?rst group of
cide with the selected time interval. It should 60 six trigger circuit units provided with time de
be understood that various other arrangements
lay means connecting a part of said units in a
for measuring and selecting time intervals may
closed
circuit to deliver one output pulse in re
be utilized.
sponse to sixty input pulses, and means for es
The various counters may be reset in any
tablishing a representation of the number of said
known manner. For example, the linear counters 65 output pulses.
in the scales of 12 and 60 may be reset in the
7. A timing device including a ?rst group 01'
manner described in copending U. 8. application,
Serial No. 459,404. The binary counters in the
scales of 64, which include feedback means for
converting them to the scale of 60, may be re 70
six trigger circuit units provided with time delay
pending U. S. application, Serial No. 464,292. It
should be understood that reset bias potentials
tional trigger circuit units for establishing a rep
resentation or the number of said output pulses.
LESLIE E. FLORY.
set in the same general manner described in co
means connecting a part of said units in a closed
circuit to deliver one output pulse in response to
sixty input pulses, and means including addi
Документ
Категория
Без категории
Просмотров
0
Размер файла
602 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа