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0% 15» 1946‘
*
J. H. HOMRIGHO’US
FACSIMILE
COMMUNICATION
2,409,483
SYSTEM
I
Original. Filed Nov. 28, 1939
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INVENTOR,
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J. H. HOMRilGHOUS
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2,409,488
‘ FACSIMILE COMMUNICATION SYSTEM
Original Filed Nov. 28', 1939
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J, H, HOMMGHOUS
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2,409,488
FACSIMILE COMMUNICATION SYSTEM
Original Filed Nov. 28, 1939
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Patented Got. 15, 1945
5
ATES PATENT‘ OFFICE
2,409,488
FACSIMELE COCATION SYSTEM
3.? ch11 H. Homrighous, Oak Park, Ill.
Original application Novemberv 28, 1939, Serial
No. 306,537, new Patent No, 2,309,393, dated
January 26, 1943. Divided and this application
December 24, 1942, Serial No. 470,039
14 Claims. (Cl. 178-55)
2
1
nection with the accompanying drawings in
which:
My invention relates to facsimile systems and
more particularly to a system for the transmis
Figures 1 and 2 are simpli?ed diagrammatic
sion and reception of multiplexed intelligence.
An object of my invention is to provide means
for the simultaneous transmission by television
or facsimile of a number of different kinds of
views of a television transmitting station and a
television receiving station respectively, illustrat
Y ing the principles of this invention.
Figure 3 is a motor device for generating con
messages such as sound, pictures, telegraph and
trol frequencies and for producing certain char
other coded signals.
acters for televising.
Another object of my invention is to provide a
Figure 4 is an end view of one ‘of the character
high speed multiplex communication system over 10
forming members shown in Figure 3.
a single carrier.
Figure 5 is an end view of disk shown in Figure
Another object of my invention is to provide
3 for generating line and other control fre
means for transmitting two or more messages
quencies.
such as sound, pictures, telegraph and other coded
signals as video signals.
_
15
Figure 6 shows the characters for televising to
synchronize the scanning operations at the re
ceiver with those at the transmitter.
ing certain characters developed by sound and
Figures 7 and 8 show circuits for use in my in
for reproducing these characters to thereby re
vention.
develop sound.
Figure 9 shows a motor driven device for gen
Another object of my invention is to provide 20
erating control frequencies at the receiver with
means for transmitting permutation code char
circuits for controlling the motor from repro
acters as video signals and for reproducing these
Another object is to provide means for televis
duced characters.
signals to thereby operate typing or printing
mechanism.
Figure 10 shows the control characters repro
'
Various methods for transmitting a number of 25 duced at the receiver.
Figures 11 to/15 are representations of various
messages on a single carrier have been developed.
characters, symbols or signs for televising sound
Some of these systems employ mechanical de
and other information as video or picture signals.
vices for transmitting like messages which limits
Figures 16, 23 and 24 show devices for pro
the speed of transmission. Other systems employ
devices to intermittently transmit fragments of 30 ducing the characters at the transmitting tubes.
Figure 1'7 shows a portion of a tape with printed
like messages. In my present invention I employ
code characters.
electronic devices to simultaneously transmit two
Figures 18 to 2'0 show devices for translating
or more like or different types of message.
the various characters. televised into electrical
According to my present invention, picture sig
"
nals are combined with control signals and may 35 variations of energy.
Figures 21 and 22 show alight valve used in
also include other signals such as sound, tele
this invention.
graph or other coded signals, in such a manner
that all signals are transmitted and reproduced
as picture or video signals, thereby greatly sim
plifying the equipment and circuits used, and
also insuring absolute synchronization of the
Figure 25 shows an audio ampli?er.
'
In Figure 1 the numeral l designates a cath
510
ode ray transmitting tube of conventional type,
and is known as an iconoscope, and as illustrated
it comprises a mosaic photo-electric screen on
which a light image of the object is projected and
generating the sweeps and blanking frequencies
an electron gun for generating a ray of electrons
at both the transmitter and the receiver, and hav
ing the voltage Waves at the respective line and 45 directed at the screen, and two sets of de?ecting
scanning operations.
This is accomplished by
plates for de?ecting the electron ray at the line
and ?eld frequencies, so that it is caused to scan
the screen. The picture and certain other char
acters are thereby developed and fed by an out
having the equipment for producing the charac 50 put connector 2 to a modulating ampli?er 3.
A carrier wave is provided by an oscillator ii.
ters at the transmitter de?nitely locked in step
In the power amplifier 5 this carrier wave is mod
with its generating equipment. These frequencies
ula'ted by the frequency band video orpicture
are applied to produce the scanning action of the
signals through the modulation ampli?er 3. The
pick up tube at the transmitter and the scanning
action of the viewing tube, so that the electron 55 signals from the ampli?er 5 are supplied by a con
nection 6 to the antenna ‘I.
g
ray in the transmitting and receiving tubes will
The control signals as well as the sound signals
always be in synchronism during the scanning
are transmitted as video signals which will ap
operation.
preciably reduce the frequency band now required
This invention will be better understood by re
ferring to the following description taken in con 60 for television.
?eld frequencies and blanking frequencies gen
erated at the receiver and controlled by televising
certain characters and translating these into
proper frequencies at the receiver, and also by
2,409,488
4
3
At the receiving station shown in Figure 2, the
antenna 8 receives the carrier signals from the
exact instant required. Likewise the disk 29 is
rotated by the motor ill between the sources of
light 3%} and 32 and the photo-electric cells at
and 33, respectively, to generate line scanning and
ransrnitter antenna ‘i to a radio frequency am~
pli?er 9. An oscillator iii reacts with these sig
blanking frequencies.
nals in the ?rst detector stage it on the superv
heterodyne principle to produce an intermediate
frequency which is supplied to the video interme~
diets-frequency stage l2.
In Figure 5, I have shown an end view of disk
29, divided into four equal divisions which repre
sent four ?elds, or two picture changes, which is
easily arranged for any number of lines per ?eld
by the number of holes in each ?eld division of
,
After suitable ampli?cation, the video signal
is detected at l3 and applied by a connection iii
to a scanning device l5. The device 15 is repre
sented as being in the form of a cathode ray tube
of conventional type and comprises a fluores
cent screen It, an electron gun for developing a
ray of electrons directed at the screen, and. two 15
the disk; also by altering the position of the holes
consecutive or progressive line scanning may be
obtained as well as interlace of l to 2 ratio or
1 to 4 ratio which would also require reducing or
increasing the number of openings in disk 2i‘; for
vertical scanning. The line blanking frequencies
are obtained from the photo cell 33, controlled by
sets of electrostatic plates for deflecting the elec
tron ray at the line and ?eld frequencies to cause
it to scan the screen. The video signals are ap
plied to the control electrode of the electron gun,
the same openings as cell 3 l, but positioned in an
other location at the disk, so that both cells will
be operated from similar ?eld openings; likewise
vertical blanking may be obtained from another
photo cell operated from the disk 25. As shown
in Figure 5, ?eld A has 220 openings and ?eld B
has 221 openings, so positioned that the openings
whereby, the intensity of the electron ray is made
to Vary with the video or picture signals which
may include sound and permutation code char
actors.
The ?uorescent screen l6 may be scanned by
various devices in order to translate the charac 25 in ?eld B are advanced a distance equal to one
half of the space between the holes.
ters thereon into control signals and sound sig
From the above description, it will be seen that
nals to be more fully explained hereinafter.
the pulses for controlling line scanning are de?
Referring to Figure 3, the numeral l1 repre
nitely locked with the speed of the motor. There
sents a motor, having an adjustable speed, which
is operated from the local power circuit, and runs 30 fore any change in speed of the motor does not
alter the number of openings per ?eld or per
at approximately 900 R. P. M. 58 is a drum hav
frame, and by slightly changing the speed from
ing two black bands is and 26 each of which ex
sixty cycle operations it is possible to avoid inter
tends over one half of the periphery of the drum
ference from the local sixty cycle power supply
if; or through an angular distance of two ?elds
as shown in Figure e. The two bands are located 35 and its harmonics.
adjacent the opposite edges of the drum respec
A system Or circuit for producing the pro-per
sweep signals is shown in Figures 7 and 8. In Fig
tively, so that by rotating the drum in front of
ure 7, I have shown a photo cell 34, which may
the transmitting tube two black vertical lines will
appear alternately, but separated on the mosaic,
be either cell 28 or 3! in Figure 3. This cell 34
as shown in Figure 6 by the numerals 2i and 22. 40 is responsive to the variation of light energy
This drum I8 may be known as a code sender.
caused by the rotation of the disk 26 or 29 to
Thus it will be seen that each mark or sign on
cause grid excitation of ampli?er tube 35. The
the mosaic will be de?nitely identi?ed with a
anode of tube 35 is connected, through a winding
frame or picture change, and also de?nitely re
of transformer 35, to the positive terminal of the
lated to the speed of the motor or 30 picture
voltage divider 31. The voltages induced in the
changes for 900 R. P. M. of the motor. These
secondary winding of the transformer 3% drive the
marks will be reproduced in the receiver, where
grid of tube 33 positive, discharging the condenser
they will be used to generate current, for control
39 through the tube. Thus by alternately charg
purposes to be further explained later.
ing the condenser 39 through resistance 40 and
The representation of the images shown in Fig 50 discharging it through the tube a saw tooth wave
ure 6, and other ?gures having similar represen—
is generated. The vertical sweep frequency, con
tation, applying to the transmitting tubes, are
trolled by disk 25, is fed through conductor Ill
shown similar to the Way that they are reproduced
to the conductor 42 at the transmitting tube in
for clearness. It is to be understood that the lens
Figure 1. The line sweep frequencies generated
system at the transmitting tube will change the 55 by disk 29 are transmitted through conductors 4!
image location.
and 43 to the transmitting tube.
'vAgain referring to Figure 8, the numeral 66
The short horizontal line 23, Figure 6, shown
shows a belt, driven by a pulley through gears at
above the vertical control characters, is a per
one half the motor speed, and having mirrors 6%,
manent mark either on the mosaic of the trans
mitting tube at Zll, Figure l, or outside the lens 60 and 46, to direct sound signals toward the mosaic
of the transmitting tube to be fully explained later
system of the tube at 25. The purpose of this
in connection with Figures 18 and 19. The bev
short horizontal line, which is repeated in all the
pictures is for automatically keeping vthe receivers
eled gear shaft 41 is for connection to the tape
in proper phase relation which will be more
machine, shown in Figure 16.
fully explained later.
-
65
The disk 28 is mounted on the motor shaft and
has four holes of equal arcs apart near its periph
ery which are rotated past a source of light ‘21,
directed toward the photoelectric cell 28, which
generates pulses of current'for controlling ?eld
scanning that are de?nitely tied in with the speed
of the motor.
That is: each revolution of the
motor may produce four ?elds as well as four
pulses, and by the adjustment of the photo-elec
tric cell, these pulses are generated just at the 75
- In Figure 9 I have shown two disks 48 and (39
and associated photo cells
and 5! respectively
which are exactly like those shown in Figure 3
and need no further explanation. These disks
and tubes together with the circuits of Figs, 7
l and 8 are for generating the sweep signals for
the cathode ray receiving tube l 5, Figure 2. The
disks 48 and 49 are directly connected to the m0
tor 52. Therefore the frequencies generated are
directly related to the speed of the motor.
Referring to Figure 10, I have shown two
2,409,488
5
frames, representing the control signals or marks,
6
transformer 55. Direct current is supplied
through conductor 85, choke 8i to mid-point of
primary winding of transformer 82, thence di~
similar to those described in Figure 6. We will
assume to start, that the receiver is in synchro
vidcd through the two halves of this winding to
nism with the transmitter, and that the vertical
the anodes 14, a condenser 33 being connected
lines or characters are coming through in perfect
across the primary winding of transformer 82.
order. Therefore line 53 will be shown in frame
The cathodes 15 are connected to the source of
54 and line 55 will be shown in frame 55. These
direct current supply through conductor 84. The
lines will continue to alternate every picture
secondary winding of transformer 82 is connected
change during the television program or broad
cast. Now as the picture is scanned from top to 10 through the contact of the control relay 85 to
the motor 52 which causes the motor to run at
bottom and due to the direction of rotation of the
the speed of the picture changes or in synchro
wheel at the transmitter the line or mark will
nism with the motor at the transmitter, produc
disappear later at the lower end than at any other
ing the control characters.
portion of the character. Therefore rays of light
With reference to Figure 10, the short hori
are directed from these lower mark extremities on
zontal line 85 is produced from the permanent
the fluorescent screen [6, by the aid of a mirror
mark 25 or 25 at the transmitting tube and will
5i and suitable lenses to the photo electric cells
occur in all image ?elds, picture changes or
58 and 59. Since these marks will alternate on
frames. The purpose is to give automatic regu
the receiving tube screen in the exact likeness as
they are ‘transmitted, an alternating current may 20 lation for phase control. The mark 85 is located
be'generated in synchronism with the picture
between the two marks 53 and 55 on the screen’
it of the receiving tube l5. From a point, just
changes.
a
. With further reference to Figure 9, I have
at left of this horizontal line 86, when in proper
shown circuits for producing an alternating cur
phase relation a ray of light is directed by mirror
rent from the variations of light intensities occur 25 ill and suitable lenses to _a photo cell 88. This
ring in the photo cells 58 and 59 which may be
photo cell may be used in the circuit of Figure 7
which has previously been described. The trans
the same ones shown in Figure 10. These photo
former 35 now has its secondary winding 89 con
cells control the grid excitation of grids 50 and
nected through control relay 85. Should the
GI of ampli?er tubes 62 and 63; the anodes 64
are connected in parallel through the primary 30 motor at the receiver get out of phase and lag
winding of transformer 55, to the positive side of
behind the motor at the transmitter the line 85
would move to the left causing the photo cell to
the voltage divider 66. The cathodes 5'! are con
remain inoperative and also the relay 85;“how
nected in parallel to any intermediate point of
the voltage divider. The cathode 55 of photo cell
ever, should the motor 52 get out of phase in the
58 is connected to the grid 60 of ampli?er 52 and 35 opposite direction the line 85 would move to the
through resistance 65 to negative potential at
the voltage divider, thereby maintaining the grid
right, causing light to enter photo cell 88, which
will operate relay 85 to include the resistance 90
momentarily in the motor circuit, thereby cor-v
55 at a negative potential with respect to’ cathode
recting the phase relation.
Bi’ and plate 64. The circuit is so arranged, there
The operation of the receiver is as follows: the
fore, that an increase in the intensity of light 40
motor 52 is started through the local power sup
on the photo-cell 58 will increase the plate cur
ply, which will produce the control frequencies
rent of tube 62. The photo-cell 59 has its anode
including sweeps as have been described. The
‘:5 connected to the grid Bl of ampli?er tube 63,
operator, through the rheostat 9| will‘ slow the
and is maintained at a positive potential with
respect to its cathode ‘H. This causes a decrease 45 motor down, until the vertical control characters
53 and 55 begin to appear on the right side of the
in the plate current of tube 63, upon increasing
screen [6, in approximately the proper location
the intensity of light directed toward the photo
vertically, whereupon the local power supply will
cell 59. Other ampli?er tubes may be connected
be shut off, and the photo electric device will now
in parallel to increase the ampli?cation. There
fore it will be seen that the marks 53 and 55 50 generate electric oscillations from the periodically
changing control characters on the screen to con
shown in Figure 10 will alternately operate the
trol the frequency of alternating current gen-'
photo-cells. Explaining this more in detail, the
erated by the ampli?ers ‘l2 and 13 through" the
mark or character 53 in frame 55 does not reflect
enough light into photo cell 58 to produce any
transformer 82 to the input circuit of motor 52,.
effect, but the light reflected from the location 55 which will bring the motor into synchronism with
the picture changes; the mark 86 will move to
of the alternate mark 55 ‘into photo-cell 59 causes
the extreme top of the picture as soon as the
a decrease in the current value in tube 53. Next
motor starts to operate from the tube supply.
considering the frame 55, following frame 55, the
The picture, produced from'this system will be
line or mark 55 occurring in the opposite location
does not reflect sumcient light to the cell 59 to 60 of greater height than those at present-in use,»
on account of no space being taken between each
produce any effect. However, tube 58 will receive
?eld for synchronizing pulses as in the present
light from the blank space previously occupied
systems. The line 85 may then function to adjust
by line 53, therefore producing an increased cur
the horizontal scanning at the receiver in proper.
rent at tube 52. The plate circuits of tubes 52 and
63 are connected in parallel and hence a continu 65 phase relation.
With reference to Figure 11, I have shown a’
ously rising and falling current is produced-in the
system of marks or code which may be televised
primary winding of transformer 55, whereby al
by a system of drums or senders at the trans
ternating voltages are induced in the secondary
mitter, a separate drum for each mark which
winding. ri‘hese voltages are fed to the inverter
circuit consisting of tubes 12 and 73, each of which 70 extends half way around the drum similar to
those in Figure 3, and may be operated manually
is provided with an anode "Hi and indirectly heated
or from a typewriting machine to obtain various
cathode l5 and a control electrode or grid 15.
combinations of the lines shown. This code sys
The grids-‘l5 are normally biased negatively by
temiis ordinarily known as the ‘fBaudot”. code
a battery 11 through the resistances "l8 and 19..
The grid excitation voltage is supplied through 75 and gives thirty-one different combinations. All»
2,409,488
7
8
the receiver, these combinations or characters
ated by the light directed by the mirror I07 from
are reproduced on the screen, where they are
other code locations on the screen I6 for multi—
translated into electrical signals by the intensity
plex communications.
In Figure 20_ I have shown the mirrors I I2, I 53,
of the light rays from the marks, or from their
location on the screen, directed into individual
photo cells such as 96, shown in connection with
one line or mark. This cell may be used in Fig
ure 7 to operate a relay, which connects the
proper frequency or current through its contacts
etc., staggered on the belt I I5 for the purpose of
having the impulses operate a single line relay.
The photo cells I04, I05, etc., are now connected
in multiple to one Figure 7, which may operate
a line relay similar to 85, to in turn operate the
according to the permutation code to operate 10 telety-pe machines described in the above men
tioned patents. While I have shown only one set
teletype or other machines.
of mirrors H2, H3, etc., yet it will be understood
Figures 12, 13. and 14 show different arrange
ments of permutation code for televising in my
that other sets are provided on the endless belt
system and may be used for operating a plurality
H5, so that one set of mirrors travels past the
of teletype mechanisms, such as that shown in 15 screen I6 at the rate of one set per picture change
or frame. Other sets of photo cells similar to I04,
Patent Numbers 1,595,41'72 dated August 10, 1926,
April 18, 1933. In Figure 12,, I have shown one
I95, etc., may be connected in multiple to sepaé
rate relays and actuated by the changing light
form of the code as it is transmitted and repro
from other code character locations on the screen
1,623,809 dated April 5, 19.27, and 1,904,164 dated
duced. With this arrangement the lines 3?, 98, 20 I6. The light being directed by other mirrors
etc., are divided into segments so that they may
similar to IIZ, H3, etc., mounted on the belt II5
to translate two or more coded messages as shown
be translated into pulses of current. In Figure 13,
at Figure 13 into electrical impulses to in turn
I have shown the marks horizontally and in three
operate other relays similar to 85..
successively spaced groups per frame, so that
In Figure 15, I have shown a sound track image
these messages may be simultaneously trans 25
on the mosaic at the transmitting tube, and on
mitted and reproduced for a greater speed. In
Figure 14, I have shown another arrangement
for three sets of code characters, the horizontal
the screen at the receiving tube. This sound
track I I8 at the transmitter is produced by either
a light valve or a glow lamp having its variable
lines 99 and “it representing one group of code
characters divided into segments so that they 30 intensity light rays focused on mirrors traveling
past the tube or lens system. These mirrors 45
and 46, Figures 3 and 23, may be mounted on a
belt All in different vertical planes as shown in
These permutation code characters may be
Figure 3 and arranged so that only one mirror at
printed on a tape as illustrated in Figure 17, and
run through a machine or sender shown in Fig 35 a time is traveling downward within the View of
the transmitting tube, whereby two light valves
ure 16. The tape may consist of only one coded
placed above the tube alternately direct variable
message per ?eld or ‘a, number of messages may
intensity light rays toward the mosaic of the
be coded in each ?eld or frame as shown in Fig
transmitting tube to form two sound tracks, one
ures 13 and 14. The tape I82 may be moved in
front of the lens system of the transmitting tube 40 light valve is shown at I I1, Figure 23. The mir
ror 45 moving downward in front of the trans
I, Figure 1. The wheel IIJI , for step by step pull
mitting tube will direct the variable ray of light
ing of the tape from right to left in front of lens
from top to bottom producing the vertical sound
in Figure l is operated by the sprocket Wheel “33,
track I I8, which will retain this image during the
which wheel is connected to the motor I ‘I, through
the shaft 41 as shown in Figure 3. This will 45 scanning of one "frame. The sound track II8 of
variable density put on through the action of the
cause a code or group of codes to be step by step
light valve III and traveling mirror 45, which
placed in front of the transmitting tube, or one
mirror is started on its downward travel imme
set of codes per each frame. The codes on the
diately after the start of the line scanning in
tape I02 Figure 17' may be like those of Figures
13 and 14, or two or more tapes similar to I02 but 50 the ?rst ?eld of the ?rst frame, and will com
plete its downward travel at the time the second
bearing a single message and placed one above
?eld of the ?rst frame is scanned, whereupon an
the other may be step by step jerked in front of
other light valve, not shown, but in multiple with
the transmitting tube by the wheel IllI to trans
the light valve I I ‘I will start producing a variable
mit two or more messages.
In Figures 18, 19 and 20, I have shown code 55 density area on the mosaic at II9 by the action
of a traveling mirror similar to 66. These sound
translating devices or methods for translating
tracks will continue to alternate on the mosaic
code characters into electrical impulses. The nu
of the transmitting tube for one to two ratio of
merals I94, I05, etc., Figures 18 and 19, are photo
interlace.
cells shown above the receiving tube screen It,
While two sound tracks have been shown for
shown in the end View Figure 18, and directs rays 60
one message when using interlace scanning, it is
of light from the line or line location of the code .
to be understood that other messages may be
character on screen it into their respective photo
transmitted by another similar arrangement of
cells. A circuit, Figure 7, may be used for each
light values, associated apparatus, ‘and circuits.
line or mark, thereby producing electrical im
pulses from the characters on the screen to 0D 65 Also when using progressive scanning the mirrors
on the belt 44 may be arranged so that two or
erate relays similar to 85 to control teletype or
more mirrors may at any time be traveling within
telegraph apparatus. The mirrors I 01 and H39
.the view of the transmitting tube for multiplex
and others, travel past the screen on an endless
belt at the rate of one mirror per frame. The '
messages. Furthermore, sound signal characters
pulley IIll may be connected to the motor shaft 70 as illustrated in Figure 15, and coded signal char
acters as illustrated in Figures 12 and 13 may be
I I I, Figure 9, through step down gears not shown.
may be translated into impulses of current to give
a variety of combinations.
While I have shown photo cells I84, I05, etc.,
transmitted simultaneously.
The light valve II‘! is shown in more detail in
Figures 21 and 22, and comprises a, light ‘bulb
it is to be understood that other sets of photo
cells similar to these may be arranged to be actui 775 I20, inside of a re?ector. Over the front of the
which may be used for one set of code characters,
2,409,488
1' 9
T10
toward the image screen, means for causing the
re?ector there is a cover I2I, having a narrow
electron ray to scan said image screen to produce
rectangular opening I22. Over this opening there
thereon a facsimile sound track image from said
is placed a sheet of Polaroid or light polarizing
picture signals, a photo electric device, and means
material I23, 50 that the light from the bulb I20 5 including other movable light ray reflectors for
will be polarized at the same angle as shown by
directing light rays from different locations in
the diagonallines across the opening I22. An
said sound track image on said screen in rota
armature I24 is ?exibly secured at one end of the
tion to said photo electric device to produce vari
frame I26, provided with a sheet of Polaroid,
able frequency signals representative of said mes
adapted to be vibrated in front of the opening
sage.
10
I 22 by the electromagnets I25, which magnets
3. In a facsimile communication system, a
are controlled by the microphone I2‘I._ The Pola
transmitter, comprising a camera tube having
roid in the armature, as shown, is arranged to
an image plate, means including a movable mem
polarize the light in a horizontal plane, and as
ber for producing variable density light values in
this armature is vibrated by variable currents
different locations on said plate in rotation to
from the microphone, variable intensity of light '
is emitted from the opening I22 to the mosaic of
the transmitting tube.
‘
form vertical images thereby producing picture
signals, a receiver, comprising a picture tube
having an image screen, means for producing
facsimile images on said screen from said picture
In Figure 24, I have shown another method for
producing light variations within the view of
signals, and photo electric devices sensitive to the
the transmitting tube I which consists of two .20 variable densities of light from di?erent locations
glow lamps I28 and I29 similar to those used for
in the said facsimile images in rotation to develop
making sound track on picture ?lm. These glow
electrical signals of variable frequency.
lamps are directly above mirrors spaced on a
belt I30 similar to the light valves III and the
4. In a facsimile communication system, a
transmitter, comprising a camera tube having
The mirrors 25 an image plate and an electron ray directed to
mirrors 45 and 46 in Figure 23.
travel downward in front of a screen of fluores
cent material I3I. This screen I3I will retain the
light variations from the glow lamp for a short
interval and is placed in front of and at an angle
to the transmitting tube I, which will alternately
‘record the variable density of light on two sound
1 tracks from the ?uorescence screen.
At the receiving tube the sound tracks of vari
able density area may be translated into audio
ward the plate, a pair of light valves adapted to
be actuated alternately by electrical signals rep
resentative of a message to alter the emitted
light, means for directing light rays from said
valves to different areas on said image plate to
form thereon a pair of variable density sound
track images, means for causing the electron ray
to scan said image plate to produe picture sig
nals representative of said images, a receiver,
sound by photo-electric cells, arranged similar to 35 comprising a viewing tube having an image screen
those in Figures 19 and 20, except there would be
and an electron ray directed toward the image
only two photo cells, I04 and I05 in multiple.
screen, means for causing the electron ray to
These photo cells would be connected in the cir
scan said image screen to produce thereon fac
cuit shown in Figure '7, then to the ampli?er and
40 simile sound track images from received picture
audio speaker of Figure 25.
signals, a pair of photo electric devices one for
The embodiments of the invention which have
each of the sound track images, and means for
been given herein are illustrations of how the
directing light rays from different locations in
various features may be accomplished and of the
each of the said sound track images to their re
principle involved. It is to be understood that . spective photo electric device in alternate peri
the invention contained herein is capable of em
ods to produce variable frequency signals repre
bodiment in many other forms and adaptations,
sentative of said message.
without departing from the spirit of the invention
5. In a facsimile communication system, a
and the scope of the appended claims.
transmitter comprising a camera tube, said tube
Having thus described my invention, I claim:
59 having an image plate and an electron ray di
1. Apparatus for varying the intensity of light
rected toward the image plate, means for simul
rays comprising a source of light, a stationary
taneously displaying a plurality of code charac
member having a screen of light polarizing ma
ters in the view of said tube to develop images
terial, and another member having a screen of
representative of the characters on said plate,
light polarizing material arranged in a plane ad 55 means for causing the electron ray to scan said
jacent and parallel to the screen in the stationary
image plate to produce picture signals represent
member, means for directing light rays from the
ative of said images, a receiver comprising a pic
said source of light through said screens, and
ture tube, said picture tube having an image
electromagnetic means for vibrating said last
screen and an electron ray directed toward the
member to vary the intensity of the light rays 60 screen, means for causing the electron ray to
directed through said screens.
scan said screen to produce thereon facsimile
2. In a facsimile communication system, a
images from said picture signals, a plurality of
transmitter comprising a camera tube, said tube
relays adapted to be operated by light rays from
having an image plate and an electron ray di
said facsimile images, and means to operate said
rected toward the image plate, a light valve 65 relays as desired by changing said code charac
adapted to be actuated by electrical signals rep
ters in the view of said camera tube to produce
resentative of a message to alter the emitted
changes in the light rays from said facsimile im
light, means including movable light ray reflec
ages.
I
tors for directing light rays from said valve to
6. In a multiplex‘ communication system, a
different locations on said image plate in rota .70 transmitter comprising a cathode ray camera
tion to form thereon a variable density sound
tube, said tube having an image plate and an
track image, means for causing the electron ray
electron
ray directed toward the plate, meansto
to scan said image plate to produce picture sig
move a-t'ap'e- bearing-groups of- code characters
nals representative of said image, a receiver com
within the view of said tube to develop images
prising a viewing tube, said viewing tube having 75 representative of the characters on said plate,
an image screen and an electron ray directed
11
2,409,488
means for causing the electron ray to scansaid
image plate to produce picture signals represent
ative of said images, a receiver comprising a pic
ture tube, said picture tube having an image
screen and an electron ray directed toward the
screen, means for causing the electron ray to
scan said screen to produce thereon facsimile im
ages from said picture signals, a plurality of re
12
cathode ray viewing tube having an image screen
and anelectron ray directed toward the image
screen, means for intercepting incoming signals
in accordance with a number of messages, a mo
tor, means including mechanism controlled by
said motor for causing the ‘said electron ray to
scan said screen to form thereon from the said
signals individual images for each separate mes~
sage, a photo electric device for each of said in
lays adapted to be operated by light rays from
said facsimile images, and means to selectively 10 dividual images, and movable means, driven by
operate said relay by changes in the light rays
said motor, provided with light're?ectors for di
from said facsimile images responsive to the
recting light rays of variable intensities from
changes in the said code characters in the view
each
of the said individual images to their as
of said camera tube.
sociated photo electric devices, said re?ectors
7. In a multiplex communication system, a
adapted to move in a path adjacent said screen
transmitter, comprising a camera tube having an
to direct light rays from said images to said
image plate and suitable circuits for producing
photo electric devices thereby producing a plu
picture signals, means for producing a plurality
rality of series of electrical signals representa
of code character images representative of dif
tive of said messages.
ferent messages on said plate and for changing
12. In a facsimile communication system, a
the characters in successive images thereby pro
cathode ray viewing tube having an image screen
ducing a train of picture signals representative
and an electron ray directed toward the image
of said images, a receiver comprising a picture
screen, means for intercepting incoming signals
tube having an image screen, means for pro
ducing changing facsimile images on said screen 25 in accordance with a number of coded messages,
a motor, means including mechanism driven by
‘from said picture signals, a plurality of photo
said motor for causing the said electron ray to
electric devices under control of said signals,
scan said screen to form thereon in separate areas
movable mechanisms for directing light rays from
images for each of the said coded messages from
different points in said facsimile images in rota
said signals, a, photo electric device for each of
tion to said photo cells to produce a number of
said areas, and movable means, driven by said
di?erent series of electrical signals representative
motor, provided with light re?ectors for directing
of said messages.
light rays from the said images in each of the
8. In a facsimile communication system, a
said areas to said photo electric devices, said re
cathode ray camera tube having an image plate
?ectors adapted to move in a path adjacent said
and an electron ray directed toward the plate, a 35
screen to direct light rays from said images to
tape havin‘T printed thereon variously arranged
said photo-electric devices to produce a number
characters representative of a combination of
of series of electrical signals representative of
signals, a motor, means including said motor for
said coded messages.
moving said tape within the View of said tube to
13. In a facsimile communication system, a
develop images of said characters on said plate, 40
cathode ray viewing tube having an image screen
means including said motor for causing said elec
and an electron ray directed toward the image
tron ray to scan said image plate to produce pic~
screen, means for intercepting incoming signals
ture signals representative of said images.
in accordance with a number of telegraphic mes
9. In a facsimile communication system, a
cathode ray camera tube having an image plate 45 sages and telephonic messages, a motor, means
including mechanism driven by said motor for
and an electron ray directed toward the image
causing the said electron my to scan said screen
plate, a motor, a light valve adapted to be actu
to'form thereon in separate areas images for each
ated by electrical signals representative of a mes
of the said messages, a photo electric device for
sage, movable means, driven by said motor, pro
each of said areas, and movable means, driven
vided with mirrors to direct light rays of variable
intensities from said light valve to said image
plate, said mirrors arranged to be moved within
by said motor, provided with light re?ectors for
directing light rays from the said images in each
of the said areas to said photo electric devices,
said re?ectors adapted to move in a path adja
the view of said camera tube to direct said light
rays over said image plate to form thereon a
cent said screen to direct light rays from said im
narrow variable density sound track image, and 55 ages
to said photo electric devices to produce a
means, including mechanism, driven by said mo
number of series of electrical signals representa
tor‘ for causing said electron ray to scan said
tive of said telegraphic and telephonic messages.
image plate to produce electrical signals repre
sentative of said image.
14. In a facsimile communication system, a
transmitter, comprising a camera tube having a
mosaic image plate and an electron ray directed
toward the plate, a plurality of glow lamps each
responsive to electrical signals representative of
a message to emit variable intensity light rays,
10. In a facsimile communication system, a
cathode ray viewing tube having an image screen
and an electron ray directed toward the image
screen, a motor, means including mechanismv
driven by said motor for causing the said elec
tron ray to scan the said screen to form thereon 65 means including movable members for directing
light rays from each of the said glow lamps to
a narrow sound track image from received sig
their predetermined plate sections and to diiTer~
nals, a photo electric device, and movable means,
ent locations in their respective sections in rota
driven by said motor, provided with mirrors ‘for
tion to form on said plate a number of different
directing light rays of variable intensity from
images, means for causing the electron ray to
said sound track image to said photo electric de
scan
said image plate to produce video signals
70
vice, said mirrors arranged to be moved in a
representative of said images, and means to
path adjacent to said screen.
11. In a facsimile communication system, a
transmit said video signals.
JOHN H. HOMRIGHOUS.
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