Патент USA US2133123код для вставки
Oct. 11, 1938. K. 'rll-IANYI 2,133,123 TELEVISlON APPARATUS Original Filed June 10, 1929 1<1 INVENTOR LMAN a IHANYI ATTORNEY _ 2,133,123 Patented Oct. 11, 1938 UNITEDÍSTATES PATENT oFFlcl-z 2,133,123 TELEVISION I I Kalman Tihanyl, Budapeshllungary, Vassigner’ to Radio Corporation of America, a corporation . y of Delaware` Original >application "June 1o, ,1929, serial No. 369,598. Di'vided‘and this application March 8, 1935, Serial No. 9,959. In Germany June 1l, 1928 s claims. (ci. 11s-1.5i i The present invention relates` to television ap paratus, and is particularly directed to the re ceiver end of the system. This application forms Va’clivìsional part of my copendinggapplication~ 5 . Serial No. 369,598, iiled June 10, 1929, for an in vention entitled Television apparatus. ` tube, there is developed between a cathode ‘I and an anode 9 anvelectron beam conventionally des ignated II whose intensity is controlled in ac cordance with the strength of the received signal applied to the control gridA 3. At the opposite end of the tube 5. there is provided a iluorescent , It is one of the primary objects of the present screen structure i3, and intermediate this screen structure and the point at which the electron invention to eliminate many of the dimculties - beam II is developed, there is provided a source which arise in connection with the- methods of of _electrons which is provided by means- of a reproducing television images as heretofore’prac ticed in the -art, with particular reference being _series of cathode wires or some other appropriate emitter I5. The electrons emitted from the had to the diñiculties which have arisen in con source I5 tendto ñow toward the screen struc nection with the so-called mechanical types of television apparatus such, for example, as the ture I3 by reason of the voltage difference main Nipkow disc. Also in the prior art, so far as I tained between the emitter _I5 and the screen I3 by the battery I1 so that in the absence of any am aware, diñiculties, havefrequently arisen due to the fact that it has been substantially impos- - cathode ray II developed within the tube, there will be substantially constant intensity light pro sible to cause the produced electro-optical ef fccts to persist for any appreciable length of duced upon the fluorescent screen structure. In termediate the emitting surface I5 and the screen time. Therefore, in accordance with my pres I3 there is provided a grid-like structure I9 ent invention recourse is had to systems wherein which, for example, may be of the form shown special means are provided for intensifying the picture resulting in. the receiving tube of the by Fig. 4 so arranged the grid structure I9 com system assuming the invention to be applied to prises an internal conducting member 2i about which is a layer of insulating material 23 extend the so-called cathode ray type of .image repro ing throughout the entire length of the con 2 5' ducer. To this end the system is so designed and developed that there is produced in the receiver ductor. Covering the insulator 23 and spaced tube the effect of storage of the image producing apart from each other are a plurality of electri isolated photoelectric areas 25. With the signals so that the electro-optical eiîects which cally arrangement as described, the electron beam Il result are maintained substantially throughout the entire scansion cycle. ’ Other objects and advantages of the' invention are to provide improved television reproducing apparatus which will be eflicient in its operation, Q3 Cil and easy to control. , « Still otherobjects and advantages will be ap parent to those skilled in the art by a reading of the following specification and claims taken ,in connection with the accompanying drawing 40 wherein: Fig. 1 discloses an arrangement wherein a grid like struc’fure is combined with an electrode for emitting electrons to control the brilliance of the - _ fluorescent effects resulting; . Fig. 2 shows a modification of the arrangement of Fig. 1; v . ' Fig. 3 illustrates a still further modiiication; and - , ' ~ Fig. 4 shows, for example. one form ofgrid structure which'might be used in connection with Cl O the apparatus disclosed by Fig. 1 although other forms of grid structure could be substituted. In making reference to the accompanying drawing, image signals transmitted by any de Ui UI sired Atype of transmitting apparatus such, for example, as that shown in my parent application Serial No. 369,598 above referred to, are _suitably received in a receiving device I and are supplied to the control electrode system 3 of a cathode ray l60 tube conventionally designated 5. Within this developed within the tube passes through the 10 15 20 25 ‘ 30 emitter element I5 so as to impinge upon the photoelectric surface 25 and the associated in sulator 23 in the area intermediate the inde pendent photoelectric areas. When this hap 35 pens, itis believed that the positive charge which the photoelectric areas acquire due to the illumi nation of the screen structure I3 as produced by Vthe electrons from the source I5 impinging upon the same will be neutralized, and thus the in-- tensity of the fluorescent effect resulting will be modiñed. The charge produced by virtue of the impact of the beam electrons as controlled in in tensity by the signal applied to the control grid 3 will vary the intensity of illumination upon the 45 screen structure I3 so that it is proportional to the signal received. This intensity of fluorescent eiïect will continue during the time interval be tween successive scansions by the beam. ’ The scanning action takes place by virtue of 50 any s 'table controlling voltages applied to the deilecting systems 21 and 29 which, itv may be assumed, are in synchronism with similar con trolling voltages at the transmitter end of they system, and thus the developed cathode ray beam 55 is caused to scan each elemental area of the structure 2|, 23, 25 at a predetermined rate. In the modiñed form of arrangement as dis closed, for example, in Fig. 2, there is arranged intermediate the screen structure I3 and the 60 2, 2,138,123 electron beam developing arrangement compris ing the cathode 1 and the anode 9, two additional Ato fluorescé underv electronicl bombardment, a y electrodes which comprise cathode wires. such as _ source of electrons substantially adjacent the that shown at 3| and a photoelectric layer such as that shown at 33. The layeror gridl 33 with ate the electron source and the screen, means to its electric ñeld elements inñuencing the inten screen structure, a control electrode intermedi produce> a cathode ray bean-i and to` control the intensity thereof in accordance with received sity of the electron current from the cathode Y . image signals,'and_ means for >causing the in wires 3l in a manner substantially similar to that oi’ the ordinary type of two-plate valve in tensity controlled cathode ray beam to scan the v10 which the cathode is between an anode andan opposite electrode. The grid-like structure 33 and the electrode 3| may also be arranged be hind the screen where desired. Any negative charges on the photoelectric grid 33 must be 15 removed or neutralized after the conductor has been’ transmitted, and‘this may be done by iri dation with homogeneous light, for example, as indicated conventionally -by means of the in falling light rays designated as 35, and the photo said control electrode to produce ateach ele mental area thereof during scansion an electro static charge to modify the illumination intensity 10 normally produced at the screen structure. 3. In a cathode ray beam comprising an evacu ated envelope containing a screen structure> adapted to .fiuoresce under electronic bombard 15 ment, a homogeneous source of electrons sub stantially adjacent the screen structure, a control electrode intermediate the electron source of the screen structure, said control electrode compris ing a network of electrically conducting strands 20 the entire grid to be charged to a positive ten sion, for example, the limit tension, and is then having insulating material surrounding each, and ready for the next operation or, in other words, a plurality of separated light sensitive elemental the next cycle of scansion, and the electrodes areas supported upon the insulators, means to 25 released by the homogeneous light beams may . produce a cathode ray `beam and to control the be accumulated in any positive portion of the intensity thereof in accordance with received 26 image signals, and means for causing the in tube, for example, the screen structure itself. A still further modiñcation of the arrangement, iensity controlled cathode ray beam to scan said as disclosed by Fig. 3, a cathode is shown at the control electrode to produce at each said light 30 rear of the fluorescent screen I3. In this show sensitive elemental area thereof during scansion ing, 31 represents an insulated plate on the front an electrostatic charge to modify the illumina 80 tion intensity normally produced on said screen face of which layers of photo-sensitive material structure. 39, as described above, are provided. Opposite 4. In an electron tube of the cathode ray type the layers of photo-sensitive material 39 are 35 .similar layers @l which are arranged on the face including an evacuated envelope, a cathode at one end thereof. and an anode to which appro 85 of the plate 31 which is not struck by the devel oped cathode ray beam il. The screen structure priate voltages are adapted to be applied so as I3 with its phosphorescent layer is arranged on to develope an electron beam, an image carrier the rear face of the system, and electrodes which in the opposite end of the envelope, said image radiate electric particles, such as the cathode carrier comprising a network of electrically con ducting strands having insulated material sur " element d3, may be arranged at the rear of the rounding each, a plurality of separated light` system. The cathode wires are preferably made from a metal having a low cathode drop, and the sensitive elemental areas supported upon the in sulators, a fluorescent screen positioned adjacent tube is ñlled with a rare gas, such as argon, for 20 electric effect which is released thereby will cause example, at low pressure. The wires may also be of oxide in red hot condition, and may be coated, for example, with barium oxide. As described in connection with the description of Fig. 3, homo geneous light from a suitable source 35 may be 50 arranged to neutralize the charges at the com pletion of each cycle of scansion. While the invention. has been illustrated in several of its preferred forms it will, of course, be apparent that many additional modifications may be made without departing from the spirit and scope of the aforegoing disclosure. Having now described one form of the inven tion and the manner in which it is believed the same may be operated, what is claimed and 60 desired to secure by Letters Patent is the follow ing: ' ' ` 1. In a television apparatus, a cathode ray tube having means at one end thereof to develop an electron beam, an image carrier at the other 65 end of the tube, said image carrier comprising a network of electrically conducting strands having insulating material surrounding each, a plurality of separated light sensitive areas supported upon the insulators, a fiuorescent screen and a source 70 _of electrons each positioned adjacent said image carrier, and on opposite sides thereof. 2. A cathode ray tube comprising an evacuated envelope containing a screen structure adapted to and on one side of said image carrier, and a source of electrons positioned on the other side 65 of said image carrier. 5. An electron tube of the cathode ray type including an evacuated envelope. a cathode at one end thereof and an anode to which appro priate voltages are adapted to be applied so as to develop an electron beam, a fluorescent screen structure adapted to fluoresce under electronic bombardment positioned in the opposite end of. the evacuated envelope, a source of electrons sub stantially adjacent said screen structure, a con 55 trol electrode adapted to control the flow of electrons from said source to said screen struc ture, said control electrode comprising a plurality of electrically conducting strands having insu lating material surrounding each, and a plurality of separated elemental light sensitive areas sup ported upon the insulators, means for controlling the intensity of the devloped electron beam in' accordance Wtih received image signals, and means for causing the intensity. controlled elec tron beam to scan the said screen structure and a control electrode to produce at each elementalv area of said control electrode during scansion an electrostatic charge to modify the illumina tion`intensity normally produced _at said screen structure. TIHANYI.