0% 15» 1946‘ * J. H. HOMRIGHO’US FACSIMILE COMMUNICATION 2,409,483 SYSTEM I Original. Filed Nov. 28, 1939 :s Sheets-Sheet 1 5 ' 'rowsa 6: I J ' 7 AMP. 4s 44 “F163. FIG4I 1Q r as -' INVENTOR, > 0d. 15, 1946- 1 J. H. HOMRilGHOUS I 2,409,488 ‘ FACSIMILE COMMUNICATION SYSTEM Original Filed Nov. 28', 1939 yvvvv + 80 38heets-Shéet 2 . m 00 8| 2 76 74 74 "I > i . FIG 95 / I86 INVENTOR. "6¢1s,194s.. ' J, H, HOMMGHOUS } 2,409,488 FACSIMILE COMMUNICATION SYSTEM Original Filed Nov. 28, 1939 3 Sheets-Sheet 3 I30 - Wm F5625 " ' » %/ ' ’ mmvron. 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.