close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2105902

код для вставки
‘ Jan. 1a, 1938.
M. CAWEIN
2,105,902
PERIODIC VOLTAGE GENERATOR
Filed Feb. 15, 1936
FIG.
IO {I2
CARRIER T
FREQUENCY
[l5
I.
.
_ [l4
VIDEO
"*7
DETECTOR
‘AMPLIFIER
II
_
-
[l5
CATHODE
FREQUENCY
‘AMPLIFIER w
,
-
'
RAY
m.
TUBE
‘
l
l6
‘
''
f
PICTURE
\
FREQUENCY.
.,
*
GENERATORR
,E'M
5?
'
' 20
F162.
33
22/5
INVENTOR.
_
I
.
Q
I
\('
MADISON
r
I
C
\'
EIN
I11’
ATTORNEY.
new 1.... 1a, was
-
'
’_
»
2,105,902
UNITED STATES PATENT OF'FlCE
rrmomo vouriioc csncaa'ron
~ Madison Cawcin, Mnnhaswt, N. Y., assignor to
multiple corporation, a corporation or Dela
ware
,
,
' Application February 15, 1936,v Serial No. 54,022
12 Claims. (Cl- 250-36)
This invention relates to the generation of peri-
is, applied to the plates with equal amplitudes
odlc voltages of complex wave form, such as
and opposite polarities, if maximum e?iciency is
“saw-tooth” and related forms, and to the utilization of such voltages, particularly“ ‘for effecting
tobe obtained. More particularly, by tilizi'ng two
balanced de?ecting voltages only one-half of the
5 cathode-ray scanning in television ' systems.
‘ _
voltage amplitude is required for each half of the
According to present, practice in television systems, a carrier wave is transmitted, modulated by
picture or video-frequency signals, corresponding
to the varying valuesjof light and shade in the
10 transmitted picture, Scanning synchronizing impulses are also transmitted, usually also as modulation frequencies impressed ‘on the same television carrier as the video frequencies. A cathode-ray tube is employed at the‘ receiver, wherc-
scanning voltage supply, as in the case where
a single unbalanced scanning voltage is used. and
116K166 an ‘Operating voltage may be used for the
l01
generator which is of an amplitude of only one
half that which would be needed if a single un- 10
balanced Scanning Voltage were to be developed
Furthermore, any\ electrostatic and magnetic dis
turbances to which the voltage supply‘ circuits’
are subjected will be balanced out or neutralized
15 in a cathode ray. or electron beam is produced
and focused upon a ?uorescent screen. Voltages
at- video frequencies, derived from the received
carrier, are utilized to vary the intensity or the
ray according to the signal amplitude. In order
20 to effect scanning of the screen by the ray, sawtooth voltage or current waves are generated and
utilized at the receiver to produce, respectively,
electrostatic or magnetic ?elds of saw-tooth wave
form which de?ect the cathode ray, usually hori25 zontally for line scanning and vertically for picture scanning. The well-known rectilinear pattern is thereby traced upon the screen to repro-
in these circuits also, when such a balanced ar-' 15
l‘?ngement is employed,
. It is an object of the present invention to
provide an improved generator for developing
periodic voltages which are of balanced, and
h
preferably of saw-tooth, wave form. which are 20
of relatively high amplitudes, and which are
especially suitable for use in a television receiver
to effect scanning by the cathode my.
A further object of this invention is to provide
a generator of the character described, which is 25
relatively simple in its construction and operation.
duce-the scene. The synchronizing impulses derived from the carrier are utilized to control or
30 operate the‘ scanning wave generators so that the
scanning actions at the receiver are maintained in
proper synchronism with the corresponding ac- ’
tions at the transmitter.‘
In present practice, relatively high voltages are
35 employed for the electrodes of ‘the cathode-ray
tube, as ior focusing the ray, and corresponding-
ly high scanning voltages are, therefore, required.
It is, of course, essential that the saw-tooth scanning voltages be of such wave term as to effect
40 accurate linearityof trace ‘and rapid retrace of
the scanning ray. Furthermore, it is highly desirable that the scanning voltage generators be
In accordance with the present invention,
there is provided a periodic voltage generator
which includes capacitance means, as for example
a condenser, and a source of direct current. A 30
pair of circuits is provided for charging the ca
pacitance means to opposite polarities from the
direct-current source, and means-are provided
for controlling the circuits, periodically to charge
the capacitance means alternately to opposite 35
polarities. One of the circuits includes two im
pedance means of substantially equal values and
symmetrically disposed in the circuit for the
periodic current therein. The term “symmet
rically disposed” as used in this speci?cation and 40
in the appended claims is intended to denote the
relationship whereby corresponding portions of
relatively
simple‘ in their construction and oper- >' the
elements, in
which
term
ation.
is employed,
areconnection
always atwith
equal
and the
opposite
45
Because 01 inherent electrostatic and magnetic ' periodic voltages with respect to ground.‘ Suit
disturbances to which the de?ecting plates or a able means are provided for utilizing the balanced
cathode-ray tube are subjected in operation, it is periodic voltages developed across the impedance
desirable,
not necessary,
thesetoplates
he
electricallyit balanced
with,that
respect
ground,
means.
In the preierred embodiment
of the invention,
50 thereby to neutralize the effects of the disturbances (which will then occur simultaneously and
constant-current devices, such as pentode tubes
having suitable potentials applied to their elec
in the same polarity on the opposite‘ plates).
trodes, are employed as the impedance means, -
With the plates so balanced" with respect to
and vacuum tube conductances are employed for
ground, the de?ecting voltages applied‘ thereto
55 should also be balanced relative to ground. that
controlling the circuits periodically to effect the
alternate charge of the capacitance means to
2
I
.
3,100,902
opposite polarities. Suitable means, as for ex
ample a regenerating tube, may be provided for
' accelerating the action of the control tubes.
' scanning by the ray.cathode-ray
‘of a
tube, to eifect
For a better understanding of the-present in
10
the screen and thereby reproduce’ the transmit
ted picture.
_
'
'
'
\\Referring now more particularly to the por
tion of the system shown in the drawing which
embodies the present invention, the voltage gen
erator l1 comprises capacitance means, more
particularly a condenser III, and a direct-current 10
source, such
I9. by-DaSScd for peri
15
15'
tion, while Fig. 2 is a graph of the balanced saw
tooth
voltages developed by the generator shown
20in
Fig; 1.
» _eferring now particularly to the drawing, the
25
frequency or superheterodyne type,
includes, in cascade, an antenna and ground as
lO-I I, a carrier-frequency ampli?er I2, a
detector l3, a video-frequency ampli?er I4 and a
cathode—ray tube l5.
ere the receiver is of
_nate charges of the condenser to opposite polar
ities. Speci?cally, one of the charging circuits of 20
the condenser l8 includes thecontrol means,
25
biasing potential is applied
30 the superheterodyne type, the conventional oscil
the tube 2| from a tap on
the battery It! by way of a resistor 24. The other charging circuit includes impedance _ means 30
which,» in the embodiment of the invention illus
35
Speci?cally, the constant-current pen
ator l ‘I,
will be hereinafter further described. The tube
I5 is preferably conventional in construction
and
‘
operation.
.
and 33 are connected with their ‘spacecurrent paths in series across the
through the condenser 18 .and resistors 34 and
35.
Suitable potentials are supplied from the
battery [9
40
Since the system shown in the drawing, thus
45 far described, is, in general,,wel-l understood in
the art,‘ a detailed explanation or its general
50
50,
nal from the ampli?er i2 is delivered to the de
tector l3 in which are derived the video fre
quencies of modulation including the synchro
nizing-i'requency components which are supplied
to the video-frequency ampli?er I 4, wherein they
are ampli?ed and thence supplied,
55
nitude as the voltage, of the source 19.
the ‘resultant balanced saw-tooth voltage is of an
amplitude approaching twice that of the voltage
of the source. It will be understood,.however, 60
that in place of the constant-current devices,
in the picture-frequency
generator l8 and line-frequency
generator I1,
respectively, which generators are, as stated. con
the- synchronizing-voltage; impulses
and are applied to the scanning elements of the
cathode-ray tube to produce magnetic and elec
For regenerating the operation of the tubes 20.
and 2|, there is provided a regenerating tube 25.
The input circuit of the tu 251s eifecti'vely cou
pled to one of the charging 0
ts of the con
70
i
denser l8 and to the video~frequency ampli?er ll 75
3
9,105,908
by connection to the adjustable tap of a voltage
divider 23 through a coupling condenser 23. One
terminal of the voltage divider 25 is connected to
the anode of the tube 23 and the other terminal,
through a coupling condenser 21, to the video
frequency ampli?er H. The cathode of the tube
25 is grounded and its control grid circuit in
cludes a suitable biasing resistor 29.“ The anode
of the tube 25 is connected'directly to the control
grid of the tube 2| and, by way ‘of a coupling
condenser 33, to the control grid of the
10
Operating voltage is supplied from the battery
l3, by'way of a resistor 3|, to the anode of the
tube 25.
.
In order to utilize the periodic voltage thus
15
developed, opposite terminals of the condenser
Il may be connected, by'way of coupling con
densers 31 and 33, directly to the scanning or
'20
de?ecting elements of the cathode-ray tube i5.
Preferably, ‘a pair of serially-connected resistors
39 and ill having ‘their junction grounded for
periodic‘currents is connected across the load
the negative terminal of the battery i9. Under
these conditions, the grid of the tube 23 becomes
negative with respect to its cathode by an amount
approaching the voltage drop across the resistor
3 I ,- while the grid of the tube 20 becomes negative til
relative to its cathode by an amount approaching
'the bias‘ impressed thereon from the battery l3 _
through the resistor 25. The tubes 23 and 2i are
thus rendered-non-conductive and the charging
of the condenser 13 to the opposite polarity is 10
repeated through the tubes 32 and 33, as de
scribed above. While the tubes 32 and 33 are at
all times conductive‘, and their circuit is in par
allel with the circuit including the tubes 20 and
2|, they do not prevent the charging of the con
denser l8 through the tubes 2i and 22 to the ini
tial polarity,lsince the impedance of the circuit‘
including the tubes 32 and 33 is very much higher
than that of the circuit including the tubes 20
and M.
'
20
The charging of the capacitance means or con
denser IB alternately to opposite polarities is pe
riodic and the action is synchronized by virtue
. circuit. The junction of'theresistors 39 and Ill‘ of the synchronizing ‘impulse voltages which are
may be grounded, for direct current also, as applied negatively to the control grid of the tube
25 shown, or may be maintained at any suitable di
25 from the video-frequency ampli?er, by way of
rect voltage with reference to the operating volt
the coupling condenser 21 and voltage divider 25.
ages of the electrodes of the cathode-ray tube.
The circuit constants are so selected that the volt
In considering the operation of the generator age built up across the tubes 23 and 2i during the
l‘l shown in the drawing, a single cycle will be de
trace is justshort of breaking down these tubes. 30
30 scribed in detail from the point in the cycle at ’ with normal grid voltages applied. During this
which the condenser I3 is charged to its maxi
‘portion of the cycle the grid voltage of the tube
mum potential with its upper plate, as shown in 25 remains constant so that its anode voltage
the drawing, positive. The tubes 32 and 33 are which is applied directly to the grids of the tubes
at all times conductive but the chargingv circuit 20‘ and 2i is also constant. Upon the occurrence 35
of the condenser through these tubes is of high of" a negative synchronizing impulse, the con
impedance, thereby limiting the rate of charge , ductanceof the tube 25 is suddenly decreased and
to a predetermined value. Under these condi
its anode voltage raised. That is, the grid volt.
tions the condenser I3 is gradually and linearly ages of the tubes 2il'and 2| are increased posi
charged, so that the potential of its upper plate tively to such a value that their existing anode 40
increases negatively and that of its lower plate,
are su?icient to break them down. The
positively through the circuit commencing at the voltages
effectiveness, on the control of the tube 25, of
positive terminal of the battery. 19 and-including ' the synchronizing voltage impulses from the
the tube 32, resistor 34, condenser H, the tube video-frequency ampli?er I4 and the voltage de-v
33 and resistor 35, to the other side of ' the bat
veloped across resistor 22 may be controlled simul
tery. During this charging operation the poten
45
tial of the cathode of the tube 32,‘and thus that
of the anode or the tube 2 I connected thereto,
45
taneously and in opposite senses by adjustment
of the tap on the voltage divider. Properly syn
_
chronized operation of the generator may thus be
increases positively, approaching that of the posi
It will be understood that suitable dis
tive terminal of the battery I9, Similarly,‘ the obtained.
criminating means will be included in the input
potential of the anode of the tube 33,- and thus circuit of the generator H5 or II, or both, to en. 50
£50 'that of the cathode of thetube 20, increases nega
that each is controlled only by its respective
tively, approaching that of the negative terminal sure
synchronizing impulses. Since the impedances of
of the battery I3. .This charging action con
the tubes 32 and 33 are of substantially equal
tinues until su?icient voltages are built up across
values, as are the resistors 34 and 35. and since 55
55 the tubes 20 and 2| to break down the .tubes to
initiate the flow of current therethrough. The
initial surge of current results in a voltage im
pulse across the resistor 22 which is. applied
these elements are symmetrically disposed in
' 1 their respective charging circuits for the periodic '
current of the generator, the alternating voltage
developed across the condenser I8 is substantially
This voltage 60
‘is impressed across the resistors, 39‘ and 40 and is
applied to the scanning elements of the cathode
ray tube I5, as above described, thereby effecting
negatively to the control grid of the 'tube' 25 by ' balanced with respect to ground.
60 way of the resistor 25‘ and condenser 28, thereby
reducing the conductance of this tube and pro
ducing a positive voltage impulse across the re
sistor 3i. This positive voltage ~is~instantaneously
applied to the control grids of the tubes 20 and 2|, _
scanning of the cathode ray with accurate line
arity of trace ‘and rapid retrace. .
‘
the action of these tubes being thereby regen
_ In Fig. 2, curves,“ and 42 represent the volt
erated or accelerated, ‘so that "current builds up ages developed across the resistors 35 and 40,
rapidly in the charging» ‘circuit which-includes‘ respectively. In this ?gure the abscissae repre
these tubes and charges the condenser I! to the sent time and the ordinates represent amplitude.
opposite polarity. As the charge of. the condenser
‘Relative polarities are indicated as + and -—. 70
70 ll approaches its-maximum value of the initial 7 and ground is indicated as 0. The received syn
polarity, the charging current is reduced rapidly, chronizing voltage impulsessupplied by thevideo
with theresult that the cathode of the tube 20
ampli?er determine the frequency at
rapidly approaches the potential‘of the positive frequency
generator, and the constants of the circuit
terminal of the battery 19, while the cathode of the
determine the amplitude of the resultant voltages 75
75 the tube 2| rapidly approaches the potential of
4 .
B, 105,908
developed. 'As clearly shown by the curves 4|, substantially constant, and an output circuit in
and 42, the voltages which are developed are bal
anced relative to ground.
While there has been described what at present
is considered the preferred embodiment of the
invention, it will be obvious to those skilled in
1 the art that various changes and modi?cations
may be made therein without departing from the
invention, and it is, therefore, aimed in the ap
pended claims to cover all such changes and mod
i?cations as fall within the true spirit and scope
of the invention.
,
What is claimed is:
-
g
1. A periodic voltage generator comprising ca
15 pacitance means, a direct-current circuit, a pair 4
of circuits for charging said capacitance means
to opposite polarities from said, direct-current
circuit, means for controlling said pair of circuits
I periodically to effect alternate charges of said
20 capacitance means toopposite polarities, one. of
the circuits of said pair including two impedance
means of substantially equal values and sym
metrically disposed therein for the periodic cur
rent of said generator, and an output circuit in
which the periodic voltages developed across said
' impedance means appear as balanced oppositely
poled voltages.
' -
v
-
2. A periodic voltage generator comprising ca
pacitance means, a direct-current circuit, a'pair
of circuits for charging said capacitance means
to opposite polarities from said direct-current
circuit, means for controlling said pair of cir
I cuits periodically to eifect alternate charges of
said capacitance means to opposite polarities, one
of the circuits of said pair including two imped
ance means of substantially equal values and
symmetrically disposed therein for the periodic
current of said generator, at least one of said im
pedance means being adapted to maintain the
40 current in said circuit substantially constant, and
an output circuit in which the periodic voltages
developed across said impedance means appear
as balanced oppositely poled voltages.
which the periodic voltages developed across said
impedance means appear as balanced oppositely *
poled voltages.
'
5. A periodic voltage generator comprising
capacitance means, a direct-current circuit, a
pair of circuits for charging said capacitance
means to opposite polarities from said direct-cur
rent circuit, means for controlling said pair of
circuits periodically to e?'ect alternate charges 10
of said capacitance means to opposite polarities,
one of the circuits of said pair including two uni
laterally conductive impedance means‘ of sub
stantially equal impedance values, said imped
ance means being symmetrically disposed for the 15
periodic current of said generator, and an out~
put circuit in which the periodic voltagm devel
oped across said impedance means appear as bal
anced oppositely poled voltages.
,
6. A periodic voltage generator comprising
capacitance means, a direct-current circuit, a ,
pair of circuits for charging said capacitance
means to opposite polarities from said direct-cur
rent circuit, means for controlling said air of
circuits periodically to e?ect alternate charges of 25'
said capacitance means to opposite polarities
comprising, in a ?rst of the circuits of said pair,
two unilaterally conductive impedance means of
substantially equal values, symmetrically disposed therein for the periodic current of said 301
generator and, in the other of the circuits of said
‘pair, two unilaterally conductive means sym
metrically disposed therein for the periodic cur;
rent of said generator and connected with such
polarity as to charge said capacitance means to a 35
polarity oppo ite to that of said ?rst circuit, and
an output 0 cult in which the periodic voltages ,
developed across said impedance means appear
as balanced oppositely poled voltages.
‘7. A periodic voltage generator comprising 40
capacitance means, a direct-current circuit, a
pair of circuits 'for charging said capacitance
'
means to opposite polarities from said direct
3. A periodic voltage generator comprising ca
current circuit, means for controlling said pair
pacitance means, a direct-current circuit, a pair of circuits periodically to eifect alternate charges
of circuits for charging said capacitance means to of said capacitance means to opposite polarities 45
opposite polarities from said direct-current cir— comprising, in one of the circuits of said pair,
cuit, means for controlling said pair of circuits -two impedance means of substantially equal
periodically to,e?ect'alternate charges of said 'values and symmetrically disposed therein for
50 capacitance means to opposite polarities, one of the periodic current of said generator and, in the
the circuits of said‘ pair including two impedance other of the circuits of said pair, the space-cur 50
means of substantiallyequal values and sym
rent paths of two vacuum_tubes serially con
metrically disposed therein for the periodic cur
nected and symmetrically disposed therein for
rent of said generator, each of said impedance the periodic current of said generator, and an
means comprising a constant-currentdevicefor output circuit in which the periodic voltages de 55
~maintaining the current in'said circuit substan
tially constant, and an output circuit in which
the periodic voltages developed across said im
pedance means appears as balanced oppositely
60
poled voltages.
.
,
'4. A periodic voltage generator comprising
veloped across said impedance means appear as
balanced oppositely poled voltages.
-
8. A periodic _voltage generator comprising
capacitance means, a direct-current circuit, a ‘
pair of circuits for charging said capacitance
means to opposite, polarities from said direct
current circuit, means for controlling said pair of
pair of circuits for charging said capacitance circuits periodically to e?ect alternate charges of
= means to opposite polarities from said direct-cur-v said capacitance means to opposite polarities
rent circuit, means for controlling said pair of , comprising, in one of the circuits of said pair,
circuits periodically to effect alternate charges two impedance means of substantially equal 65
of said capacitance means to opposite polarities, ' values and symmetrically disposed therein for
one ofthe circuits of said pair including two im
theperiodic current of said generator and, in
pedance means of substantially equal values and the other of the circuits of said pair, the space—
70 symmetrically disposed therein for the periodic current paths of two vacuum tubes each having
current of said generator, each of said impedance a control electrode, said tubes being serially con 70
means including the space-current path of a nected and symmetrically disposed therein for
pentode tube, means for applying potentials to the periodic, current of said generator, means
the electrodes of said tubes whereby they are for energizing said control electrodes with syn
75 e?ective to maintain the current in saidcircuit chronizing voltage impulses, and an output cir- ,
capacitance means, a direct-current circuit, a
5,
9,105,902
cuit in which the periodic voltages developed
for the periodic current of said generator, means
trode, said tubes being serially connected and
‘symmetrically disposed therein for the periodic
current of said generator, means for: energizing
20 said control electrodes with synchronizing volt
age impulses, means'associated with said tubes
pair of circuits periodically to effect .Jalternate
for energizing said control electrodes with syn
across said impedance means appear as balanced ' chronialng voltage impulses, a regenerating vac
oppositely poled voltages.
tube ampli?er having its input circuit cou
9. A periodic voltage generator comprising uum
pled
to one or said circuits and itsv output cir
5 capacitance means, a direct-current circuit, ,a cuit coupled to the control electrode of at least
pair of circuits for charging said capacitance one of said‘ charging tubes, and an output circuit
means to opposite polarities from said direct-cur
in which the periodic voltages developed across
rent circuit, means for controlling said circuits
said impedance ‘means. ‘
'
periodically to effect alternate charges of said ca
11. In a cathode-ray tube television receiver, 10
10 pacitance means to opposite polarities compris
a periodic voltage generator for developing scan
ing, in one of the circuits of said pair, two im
ning voltages for the tube of said receiver com
pedance means of substantially equal valuw and ,
capacitance means, a direct-current cir
symmetrically disposed therein for the periodic prising
cuit, a pair of circuits for charging said capaci
current of said generator and, in the other, of tance'means to- opposite polarities from said di 15
15 the circuits of said pair, the space-current ‘paths rect-current circuit, means for controlling said
of two vacuum tubes each having a control‘elec
for regenerating the action thereof, and an out
put circuit in which the periodic voltages de
veloped across said impedance means. a
10. A periodic voltage generator comprising
capacitance means, a direct-current circuit, a
'pair of circuits for charging said capacitance
means to opposite ‘polarities ‘from said direct
current circuit, means for controlling said pair
of circuits periodically to effect alternate charges
or said capacitance means to opposite polarities
comprising, in one of the circuits of said pair,
two impedance means or substantially equal
values and symmetrically disposed therein for
the periodic current of vsaid. generator and, in
the otherv of‘the circuits of said pair, the space-,
current paths ‘oi two vacuum tubes each hav
ing a control electrode, said tubes being serially
connected and symmetrically disposed therein
charges of said capacitance means to opposite
polarities, one of the circuits of said ‘pair includ
ing two impedance means of substantially equal 20
values and symmetrically disposed therein for
the periodic current of said generator, and an
output circuit in which the periodic voltages-de
veloped across said impedancev means.
12. An electric circuit arrangement for de 25
veloping a periodic voltage balanced ‘relative to
ground comprising capacitance means, a direct
current circuit, a pair of circuits for charging
said capacitance means ‘ to opposite polarities
said direct-current circuit, means for con 30
- from
trolling said pair of circuits periodically to ef
fect alternate charges of said capacitance means
to‘ opposite polaritiea'one of the circuits of said
pair including two impedance means of substan
tially equal values and symmetrically disposed
35
therein for the periodic current of said generator,
and an output circuit connected across said ca
pacitancemeans,
,
‘
'
MADISON CAWEIN.
CERTIFICATE OF, CORRECT-ION. -
January-- 18, 1958‘.
Patent No. 2,105,902.
MADISON CAWEIN . p
It is hereby certified that error appears in the printed specification
of the abovemumbered patent requiring correction as follows: Page
second
column‘, line 21.1., claim'é, for the word "air" read pair; page 5, first ‘column,
i-line 8V, ‘cla1m9, after "said" insert pair of; 'line 2h, ‘same claim, and'sec'onc'
column, lines 9and 211., claims 10 and 11' respectively, after "means" and
before th'elperiod insert'the words appear as balanced oppositely poled volt
‘ages; and that the said- Letters Patent should be read with these corrections
‘therein, that thesame may conform to the record of the case in the Patent
Office.
Signed and sealed this 29th day ‘of, March, A. D; 19758.
a Henry Van Arsdale,
(-Seali
- acting'commissioner of Patents. "
E:
9,105,902
cuit in which the periodic voltages developed
for the periodic current of said generator, means
trode, said tubes being serially connected and
‘symmetrically disposed therein for the periodic
current of said generator, means for: energizing
20 said control electrodes with synchronizing volt
age impulses, means'associated with said tubes
pair of circuits periodically to effect .Jalternate
for energizing said control electrodes with syn
across said impedance means appear as balanced ' chronialng voltage impulses, a regenerating vac
oppositely poled voltages.
tube ampli?er having its input circuit cou
9. A periodic voltage generator comprising uum
pled
to one or said circuits and itsv output cir
5 capacitance means, a direct-current circuit, ,a cuit coupled to the control electrode of at least
pair of circuits for charging said capacitance one of said‘ charging tubes, and an output circuit
means to opposite polarities from said direct-cur
in which the periodic voltages developed across
rent circuit, means for controlling said circuits
said impedance ‘means. ‘
'
periodically to effect alternate charges of said ca
11. In a cathode-ray tube television receiver, 10
10 pacitance means to opposite polarities compris
a periodic voltage generator for developing scan
ing, in one of the circuits of said pair, two im
ning voltages for the tube of said receiver com
pedance means of substantially equal valuw and ,
capacitance means, a direct-current cir
symmetrically disposed therein for the periodic prising
cuit, a pair of circuits for charging said capaci
current of said generator and, in the other, of tance'means to- opposite polarities from said di 15
15 the circuits of said pair, the space-current ‘paths rect-current circuit, means for controlling said
of two vacuum tubes each having a control‘elec
for regenerating the action thereof, and an out
put circuit in which the periodic voltages de
veloped across said impedance means. a
10. A periodic voltage generator comprising
capacitance means, a direct-current circuit, a
'pair of circuits for charging said capacitance
means to opposite ‘polarities ‘from said direct
current circuit, means for controlling said pair
of circuits periodically to effect alternate charges
or said capacitance means to opposite polarities
comprising, in one of the circuits of said pair,
two impedance means or substantially equal
values and symmetrically disposed therein for
the periodic current of vsaid. generator and, in
the otherv of‘the circuits of said pair, the space-,
current paths ‘oi two vacuum tubes each hav
ing a control electrode, said tubes being serially
connected and symmetrically disposed therein
charges of said capacitance means to opposite
polarities, one of the circuits of said ‘pair includ
ing two impedance means of substantially equal 20
values and symmetrically disposed therein for
the periodic current of said generator, and an
output circuit in which the periodic voltages-de
veloped across said impedancev means.
12. An electric circuit arrangement for de 25
veloping a periodic voltage balanced ‘relative to
ground comprising capacitance means, a direct
current circuit, a pair of circuits for charging
said capacitance means ‘ to opposite polarities
said direct-current circuit, means for con 30
- from
trolling said pair of circuits periodically to ef
fect alternate charges of said capacitance means
to‘ opposite polaritiea'one of the circuits of said
pair including two impedance means of substan
tially equal values and symmetrically disposed
35
therein for the periodic current of said generator,
and an output circuit connected across said ca
pacitancemeans,
,
‘
CERTIFICATE OF c0RREcTIoN.
Patent No. 2,105,902.
'
MADISON CAWEIN.
January-- 18, 1958‘.
MADISON CAWEIN . p
It is hereby certified that error appears in the printed specification
of the abovemumbered patent requiring correction as follows: Page
second
column‘, line 21.1., claim'é, for the word "air" read pair; page 5, first ‘column,
i-line 8V, ‘cla1m9, after "said" insert pair of; 'line 2h, ‘same claim, and'sec'onc'
column, lines 9and 211., claims 10 and 11' respectively, after "means" and
before th'elperiod insert'the words appear as balanced oppositely poled volt
‘ages; and that the said- Letters Patent should be read with these corrections
‘therein, that thesame may conform to the record of the case in the Patent
Office.
Signed and sealed this 29th day ‘of, March, A. D; 19758.
a Henry Van Arsdale,
(-Seali
- acting'commissioner of Patents. "
Документ
Категория
Без категории
Просмотров
0
Размер файла
953 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа