US2157048A - Television system - Google Patents

Television system Download PDF

Info

Publication number
US2157048A
US2157048A US468610A US46861030A US2157048A US 2157048 A US2157048 A US 2157048A US 468610 A US468610 A US 468610A US 46861030 A US46861030 A US 46861030A US 2157048 A US2157048 A US 2157048A
Authority
US
United States
Prior art keywords
electrode
image
cathode
light
ray
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US468610A
Other languages
English (en)
Inventor
Vladimir K Zworykin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Priority to US468610A priority Critical patent/US2157048A/en
Priority to FR720441D priority patent/FR720441A/fr
Priority to GB19798/31A priority patent/GB369832A/en
Priority to DER82119D priority patent/DE661263C/de
Priority to NL57694A priority patent/NL39550C/xx
Priority to BE381246D priority patent/BE381246A/xx
Application granted granted Critical
Publication of US2157048A publication Critical patent/US2157048A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/26—Image pick-up tubes having an input of visible light and electric output
    • H01J31/28—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/36—Photoelectric screens; Charge-storage screens
    • H01J29/39—Charge-storage screens
    • H01J29/41—Charge-storage screens using secondary emission, e.g. for supericonoscope
    • H01J29/413—Charge-storage screens using secondary emission, e.g. for supericonoscope for writing and reading of charge pattern on opposite sides of the target, e.g. for superorthicon
    • H01J29/416—Charge-storage screens using secondary emission, e.g. for supericonoscope for writing and reading of charge pattern on opposite sides of the target, e.g. for superorthicon with a matrix of electrical conductors traversing the target

Definitions

  • My invention relates to improvements in tele ringelectronic emission. from the cathode, and vision systems, and it has particular relation to scanning the electrical image by a cathode ray systems of the type wherein the scanning devices; or beam to influence a circuit in a suitable radio at both the transmitter and receiver, are devoid orother transmission. system. of moving mechanical elements.
  • My invention resides in an improved method 5 It has been. proposed, heretofore, to employ and apparatus of the character hereinafter defor television transmission a cathode ray'tube scribed and claimed. wherein the cathode comprises or is made up of
  • the cathode comprises or is made up of
  • FIG. 1 is an enlarged fragmentary diagramsatisfactory results, has been found to introduce matic view of a television transmission system difficulties as regards practical construction of embodying the present improvements; the cathode unit.
  • Prior art construction of the Fig. 2 is a diagrammatic -view of a television general type referred to isdisclosed by my cotransmission system embodying the present im-: 15
  • Fig. 5 is a sectional view, the section being 4
  • One of the objects of the present invention taken on the line 5-5 in Fig. 2;-
  • Fig. 6 is an enlarged sectional view, the section 20 television transmission and apparatus therefor being taken on the line 6-6 in Fig. 5; which will not only avoid the dimculties referred Fig. '7 is an enlarged fragmentary view, showto in the construction proposed heretofore, but ing a modification;
  • FIG. 8 is a section taken on line 8-8 in Fig. 7; sults in the way of possibilities for sharper'and, and 25 generally, better reception at the receiver.
  • Fig. 9 is a. view similar to Fig. 1, showing a In accordance with my invention, an image modification.
  • the cathode ray tube It! is provided with a onto a single photoelectric or light-sensitive single unitary photoelectric cathode il in the cathode, the occurring electron emission from the form of a fine mesh screen of suitable light- 30 letter is accumulated on an anode in the form sensitive material characterized by the fact that ofa relatively large number of small electrostatic electron emission occurs from a surface of the charges spaced uniformly over the area of the material when the same is exposed to light and anode and at relatively small distances apart, a at a rate which corresponds to and increases with cathode ray is developed and is caused to scan increase in light-intensity.
  • a pair of relatively thin plate electrodes l2 these electrostatic charges during each scanning and I3 are supported as shown in spaced relacycle, and the charges are utilized to control the tion to each other and in planes parallel to the influence of the scanning ray with respect to a plane of the cathode ll.
  • These electrodes are circuit in a suitable radio or other transmission provided with apertures through which tubular 40 system.
  • insulating members l4 extend, as more clearly Further, in accordance with my invention, teleshown in Fig. 1.
  • a plurality of metallic elements vision transmission is effected, in part, by acl5, having head portions l6 at one end thereof, cumulating electrostatic charges at spaced extend through the members Hi.
  • An electrode IT in the form of a fine mesh 45 the area of the image to be transmitted, the screen, is supported in the tube ID in close proxmagnitude of the charge at any region or spot, imity to the head portions l6.
  • the tube I0 is provided with an electron gun I! of any suitable construction operable to develop a cathode ray or a beam of such rays and to project the same onto the elements 15.
  • An example of the construction contemplated for the electron gun is disclosed in my co-pending application Serial No. 407,652, filed November 16, 1929, and assigned to the Westinghouse Electric and Manufacturing Company.
  • the cathode ray or beam is caused to scan the area within the image or pictureframe, there being, for example, twelve to twenty scannings of such area each second, the manner of scanning being such that the ray or beam strikes each region of such area at and immediately about each of the head portions l6 during each scanning cycle.
  • the means or apparatus for such purpose is indicated as being of the well known type comprising, for example, coils l9 supplied by a 480 cycle oscillator 20 and plates 2
  • the electrode I 2 is connected to the positive side of a battery 23, while the cathode II is connected to the negative side of this battery.
  • An electrostatic field is thus developed and maintained between the cathode H and the adjacent face of the electrode l2.
  • the distance between adjacent faces of the cathode H and the electrode I2 is relatively small, that is, of the order of one eighth of an inch.
  • the electrostatic lines of force are therefore parallel to each other and perpendicular to the adjacent parallel faces of cathode II and the positive electrode or anode l2.
  • the electrode I3 is connected as shown to the end 24 of a resistance 25, the other end of this resistance being connected to the positive side of the battery 23.
  • the negative side of the battery 23 is grounded through connection 26.
  • the electrode I1 is maintained at a fixed positive potential by connecting the same to the positive side of the battery 23 through .a connection 21.
  • a battery 28 may be included in the connection 21 to'increase this potential if desired.
  • are connected across the series-connected resistance'and battery 23.
  • the output leads 32-and 33 of this amplifier are connected in the usual manner to the well known associated-apparatus and parts, all indicated by reference numeral 34,
  • the image 35 of an object is projected through a suitable lens or lens system 31 onto the light-sensitive surface of cathode II.
  • Each of the elements l5 and the respective regions of electrodes l2 and I3 immediately about the same constitute a condenser which is continuously charged by the electron emission from cathode ll, indicated by the arrows 33.
  • This electron emission develops at the light-sensitive surface of cathode ll upon which the light image is projected, the degree or rate ofsuch emission from any particular spot or point corresponding to and increasing with the light intensity thereon.
  • the entire number of electrons emitted from the light-sensitive surface of cathode ll reach the adjacent face of the composite anode.
  • the electrons emitted from the regions or spots 42 of the light-sensitive surface reverse their direction of travel upon leaving this surface, under the influence of the electrostatic ileld,pass through the openings, in the cathode II and move toward the anode along the parallel electrostatic lines of force between the adjacent faces of the cathode II and the electrode [2, as indicated by the arrows 43.
  • These electrons then leak to ground by way of the battery 23 and the connection 26.
  • Electrons emitted from the regions or spots 40 between those designated by reference numeral 42 also reverse their direction of travel in like manner upon leaving the light-sensitive surface, as indicated by the arrows 4
  • each condenser is shown in Fig. 3, wherein Es is the charge for saturation and Emaa: the maximum charge which any-condenser can receive under any conditions of illumination of the object. That is, where a particular region or spot 40 on the light sensitive surface of cathode II is one of the brightest spots of the image, the particular condenser of which the adjacent element I5 is a part will receive the maximum charge, Emax. No condenseris, therefore,
  • the influence or effect of the ray 44 of electrons from the source or gun ill will be considered in a given instance, as the same strikes one of the regions or spots 38 of the composite anode l3l5 during the scanning action or cycle of the beam of electron rays focused on and directed to this region or spot at the instant.
  • the electrons of the ray 44 reach the screen or positive electrode IT at a velocity corresponding to the potential difference between this electrode and the cathode 46. Part of these electrons strike the wire of screen I1 and are absorbed thereby and pass or leak to ground by way of the batteries 28 and 23 and the connection 26.
  • the electrons which pass through the openings of the screen I! strike directly the region or spot 38 on the exposed face of the composite anode, part of these electrons striking the head portion 16 of element 15, the remainder striking the surface portion of the electrode l3 immediately adjacent or about the element l5, as indicated by the arrows at.
  • the scanning rate is twelve pictures per second, for example, the number of electrons released bythe photocell at any instant is measured by the photrons of light emitted in seconds from the particular spot of the object being scanned at this instant.
  • the number of light photrons available in my present improved apparatus on the contrary, the light photrons emitted from each spot of the image are all eifective with respect to the light-sensitive part of my apparatus during the entire picture or scanning period, or in other words, for a period 10,000 times longer than has been the case in apparatus proposed heretofore.
  • the available or eiiective photoelectric current provided by the present improved transmitter is ten thousand times stronger than that in the prior construction referred to. 4
  • the condenser charge E controls the extent or degree of influence of the ray 44 with respect to the electrode l3 in effecting variation in or modulation of the potential on the grid 41 of the amplifier, the amount of such variation being inversely proportional to the amount or magniture E of the charge.
  • the time allowed for each element I5 to accumulate its respective charge E is that elapsing between the times of succeeding contacts or impacts of the ray 44 on the particular region or spot 38 of the composite anode with which the element is associated.
  • the scanning rate of the ray 44 is made so great that, although each element is is being continuously charged in the manner explained, the charging time To is never great enough to permit accumulation of a charge greater than Emaa: for the brightest spot or region of the light image.
  • the graph of Fig. 4 is intended to represent a condition wherein Td is approximately one-twelfth of Te.
  • an electrical image in the form of a large number of electrostatic charges, is developed on the anode structure l3-l5, this image in effect being projected without distortion from the light-sensitive cathode ll upon which the light image 35 isprojected, the amount or degree of electrostatic charge E at any spot or region on the electrical image corresponding to and varying with the degree of light intensity on the respective adjacent spot or region of the light image.
  • the potential on the grid 41 of the amplifier is varied or modulated in exact accordance with the different degrees of light intensity on the various spots or regions of the light image, the number of scannings each second being adequate to provide for satisfactory reception of a moving image at the receiver.
  • the electrode plates l2 and I3 may be clamped at their edges between complementary supporting rings 50 of suitable insulating material and provided with lugs 5
  • a spacing ring 52 of insulating material is interposed between the plates l2 and It, as shown. Screws or other suitable means 53 may be employed to clamp the rings 58 together.
  • a photo-sensitive semi-transparent film deposited on the inside face 64 of the tube I at the large end thereof.
  • the image 35 would be projected upon the film to develop an electron emission corresponding to and efiective for the same purpose as that in Fig. 1, as represented by the arrows 39, 4
  • the anode i 3-15 may be constructed in different ways to suit different requirements, each construction, however, being characterized by the fact that it will receive the electrical image developed at cathode I l and projected therefrom as indicated by the arrows 4
  • the anode comprises two electrode sections or units 12a and-13a corresponding, respectively to the plates or electrodes l2 and I3 in Fig. l.
  • Eachof the electrodes I20. and Ila is made up of a plurality of strips 54 of nickel or other suitable material. These strips are corrugated and arranged as shown, the engaging edges being secured tog'ether in any suitable manner such as by spot welding, as indicated by reference numeral 55.
  • Tubular insulators Ha carrying the metallic inserts la extend through the openings 56 between adjacent strips 54, and have a close fit with respect to the latter.
  • the electrodes I2 and 13 in Fig. 1 may be combined'into a single electrode 51, as shown in Fig. 9.
  • the action or principle of operation is the same as that in the arrangement or system of Fig. 1, the lefthand surface portion 58 of the electrode 5! corresponding to and func-' tioning in the same manner and for the same purpose as the electrode I2 in Fig. 1, the righthand surface portion 59 corresponding to and functioning in the same manner and for the same purpose as the electrode l3 in Fig. 1.
  • the action or principle of operation is the same as that in the arrangement or system of Fig. 1, the lefthand surface portion 58 of the electrode 5! corresponding to and func-' tioning in the same manner and for the same purpose as the electrode I2 in Fig. 1, the righthand surface portion 59 corresponding to and functioning in the same manner and for the same purpose as the electrode l3 in Fig. 1.
  • single electrode 51 may be fabricated or built up in accordance with the modified construction in Figs. '7 and 8, in which case one of the sections I21: and l3a would be omitted.
  • the tube III with an interior coating 60 of silver or other suitable material, over the area between the lines 6! and 62.
  • This coating is electrically connected to the electrode l3 by a connection 63, and is therefore maintained at a positive potential.
  • This coating at a relatively high positive potential, creates an influence with respect to the cathode beam or ray to focus the same to a well defined spot on the anode l3-:
  • the tube I0 is evacuated to the highest possible degree.
  • an improved method of television transmission wherein an electrical image is de- 1.
  • the method which comprises projecting an image to be transmitted upon a photoelectric cathode, accumulating the occurring electron emission from said cathode at regions spaced with respect to each other and disposed over an area commensurate with the image area, developing a cathode ray, scanning said regions with said. ray to initiate a secondary electron emission from said regions, and absorbing the electrons of said secondary emission by an anode.
  • a television transmission system the combination with means for transmitting.
  • picture signals of apparatus for developing such signals which comprises a source of cathode rays, a photoelectric cathode positioned remote from' said source, a first and a second electrode element arranged in a plane substantially parallel to the photoelectric cathode and separated from each other and from the cathode and located between the cathode and the source, a plurality of pinlike elements carried by and distributed over the said electrode elements, said pin-like elements being spaced with-respect to and insulated from each other and from the supporting electrodes, a third electrode element interposed between the pin-like elements and the ray source, and means for causing'the ray developed to simultaneously scan the said third electrode and the area over which the pin-like elements are distributed.
  • a source of cathode rays at one end of the tube a substantially uniform photoelectric surface perforate to the free flow of electrons therethrough at the other end of the tube, a pair of plate-like electrodes arranged in spaced parallel relationship to each other and to the photoelectric surface and each interposed between the photoelectric surface and the ray source, a plurality of pin-like electrodes insulatingly supported from each other and from the plate electrodes carried by the plate electrodes and protruding therebeyond toward the ray source to be scanned by the developed ray, and a mesh-' like positive potential electrode located between the protruding pins and the my source whereby the developed ray in reaching the pin-like electrodes passes through the mesh.
  • a tube provided with a first electrode having a light-sensitive surface and being perforate to the free flow of electrons transversely through the same, a second electrode disposed in proximity to and in substantially parallel relation to said first electrode, said second electrode being imperforate to the free flow of electrons transversely through the same and comprising a plurality of electrically-conductive elements insulated from each other and from said second electrode and each exposed on both sides of the latter, and means for developing a ray of electrons directed at said second electrode, said sec-- ond electrode being disposed between said means and said first electrode.
  • said second-named means comprising a cathode ray tube provided with first, second and third electrodes supported in spaced and substantially parallel relation to each other, said first electrode having a lightsensitive surface and being perforate to the free flow of electrons transversely through the same, said second electrode being disposed between-said first and third electrodes.
  • an electron tube including at one end thereof a mesh-like screen member, photoelectric material covering one side of said meshlike screen member onto which an optical image is adapted to be projected, means at the opposite end of the tube for producing an electron beam, a pair of plate-like electrodes positioned closely adjacent said mesh-like member and intermediate the mesh-like member and the electron beam source, and a plurality of collecting pin electrode members insulatingly supported between said plate like electrode members and each other and protruding therebeyond in the direction of the source of the electron ray whereby the electron ray when developed may be caused to scan said pin-like members.
  • a source for developing an electron beam at one end of the tube a mesh-like member positioned at the opposite end of the tube, said mesh-like member having a coating of photoelectric material upon one side'thereof upon which an optical image is adapted to be projected to cause the emission of electrons, a plurality of electrode, members positioned intermediate the mesh-like photoelectric member and the electron beam source, said members being adapted to have applied thereto voltages positive with respect to the electron source and to the photoelectrically coated mesh-like member, a plurality of pin-like members insulatingly supported between said plate-like electrode members and protruding therebeyond in the direction of the electron beam source for collecting the electrons emitted from the photoelectric mesh-like member under light activation, means for causing the developed electron beam to scan the said pin-likemembers to release the. collected charges thereon to initiate electrical signals representative of the light image falling upon the. photoelectric mesh-like member, and a screen electrode through which'the developed electron
  • a television system comprising an electron tube, means for producing an electronic scanning beam within the tube, an electrode member comprising a plurality of electrically isolated sections each of substantially elemental size, a light sensitive surface, means for producing on one side of the isolated sections of the electrode in accordance with illumination of the light sensitive surface an electrostatic charge image, and means for moving the produced electronic scanning beam across the opposite side of the isolated sections of the electrode member to discharge the stored electrostatic charges and thereby produce signalling impulses proportional to the light initiating the electrostatic charges.
  • a television system comprising an electron tube, means for producing an electronic scanning beam within the tube, an electrode member comprising a plurality of electrically isolated sections each of substantially elemental size andhaving two exposed sides, a light sensitive surface, means for producing on one side of the isolated sections of the electrode in accordance with illumination .of the light sensitive surface an electrostatic charge image, and means for moving the produced electronic scanning beam across the opposite side of the isolated sections of the electrode member to discharge the stored electrostatic charges and thereby produce signalling impulses proportional to the light initiating the electrostatic charges.
  • a television system comprising an electron tube, means for producing within the electron tube a cathode ray scanning beam, an electrode member comprising a plurality of electrically isolated sections each of substantially elemental size positioned in the path of 'the developed cathode ray beam, insulating means for supporting each of the plurality of electrically isolated sections of the electrode member, a light sensitive surface, means for projecting an image of a subject upon the light sensitive surface for releasing photoelectrons and producing thereby on one side of the isolated sections of the electrode member an electrostatic charge image of the light image, and-means for moving the cathode ray beam across the opposite side of the isolated sections of the electrode to discharge the stored charges.
  • means to produce an electrical current image of a light image means to convert the electrical current image into an electrostatic charge image, and means for scanning the electrostatic charge image to produce signalling impulses.
  • a photoelectric surface means for illuminating the photoelectric surface with the light image of a subject of which a reproduction is to be produced at desired receiving points'so that there is released from the photoelectric surface an electrical current image representative of the light image, means for producing from the resultant current image an electrostatic replica and means for scanning the electrostatic replica to produce signals representative of the original optical image.
  • an electron tube In a television system an electron tube, a photoelectric surface positioned within the electron tube, means for focussing alight image upon the photoelectric surface to produce a current image representing the light image, means for converting the produced current image into an electrostatic image, means for developing a cathode ray beam, and means for moving the cathode ray beam for scanning the electrostatic image to produce signals for transmission representative of the original optical image.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US468610A 1930-07-17 1930-07-17 Television system Expired - Lifetime US2157048A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US468610A US2157048A (en) 1930-07-17 1930-07-17 Television system
FR720441D FR720441A (fr) 1930-07-17 1931-06-24 Perfectionnements aux procédés et systèmes de transmission de la télévision
GB19798/31A GB369832A (en) 1930-07-17 1931-07-09 Improvements in or relating to television
DER82119D DE661263C (de) 1930-07-17 1931-07-11 Verfahren zur Umwandlung eines in der Gesamtheit seiner Helligkeitswerte auf eine Photokathode geworfenen Bildes in ein Mosaik elektrostatischer Ladungen und Abtastung mittels Kathodenstrahlen
NL57694A NL39550C (en(2012)) 1930-07-17 1931-07-15
BE381246D BE381246A (en(2012)) 1930-07-17 1931-07-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US468610A US2157048A (en) 1930-07-17 1930-07-17 Television system

Publications (1)

Publication Number Publication Date
US2157048A true US2157048A (en) 1939-05-02

Family

ID=23860506

Family Applications (1)

Application Number Title Priority Date Filing Date
US468610A Expired - Lifetime US2157048A (en) 1930-07-17 1930-07-17 Television system

Country Status (6)

Country Link
US (1) US2157048A (en(2012))
BE (1) BE381246A (en(2012))
DE (1) DE661263C (en(2012))
FR (1) FR720441A (en(2012))
GB (1) GB369832A (en(2012))
NL (1) NL39550C (en(2012))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558647A (en) * 1947-12-12 1951-06-26 Cinema Television Ltd Storage electrode type cathode-ray tube
US2617058A (en) * 1949-03-05 1952-11-04 Hartford Nat Bank & Trust Co Television transmitting tube
US2658670A (en) * 1949-08-31 1953-11-10 Rca Corp Rate determining device
US3067348A (en) * 1959-12-21 1962-12-04 Rca Corp Pickup tube target structure
US3453471A (en) * 1964-10-09 1969-07-01 Sheldon Edward E Vacuum tube responsive to an electrical image received through an endwall of said tube provided with a plurality of electrical conductors

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2244466A (en) * 1934-05-12 1941-06-03 Emi Ltd Television
DE884507C (de) * 1934-05-12 1953-07-27 Emi Ltd Speichernder Kathodenstrahlbildabtaster mit einer vom ein- oder zweiseitigen Mosaikschirm getrennt angeordneten zusammen-haengenden Photokathodenschicht
GB446661A (en) * 1934-08-03 1936-05-04 Alan Dower Blumlein Improvements in or relating to television transmitting systems
DE896952C (de) * 1935-05-12 1953-11-16 Emi Ltd Speichernder Kathodenstrahlbildabtaster mit einseitiger Speicherelektrode
DE742761C (de) * 1935-08-06 1943-12-10 Telefunken Gmbh Bildwandler-Bildspeicherroehre mit Kathodenstrahlabtastung und einer zeilenfoermigen Reihe von Speicherelementen
DE754133C (de) * 1935-08-14 1958-04-24 Fernseh Gmbh Mosaikelektrode fuer speichernde Bildzerlegerroehren
DE753637C (de) * 1938-03-29 1954-03-08 Fernseh Gmbh Verfahren zum Betrieb von Bildspeicherroehren, vorzugsweise mit einseitiger Speicherelektrode
US2213174A (en) * 1938-07-30 1940-08-27 Rca Corp Television transmitting tube

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558647A (en) * 1947-12-12 1951-06-26 Cinema Television Ltd Storage electrode type cathode-ray tube
US2617058A (en) * 1949-03-05 1952-11-04 Hartford Nat Bank & Trust Co Television transmitting tube
US2658670A (en) * 1949-08-31 1953-11-10 Rca Corp Rate determining device
US3067348A (en) * 1959-12-21 1962-12-04 Rca Corp Pickup tube target structure
US3453471A (en) * 1964-10-09 1969-07-01 Sheldon Edward E Vacuum tube responsive to an electrical image received through an endwall of said tube provided with a plurality of electrical conductors

Also Published As

Publication number Publication date
DE661263C (de) 1938-06-15
GB369832A (en) 1932-03-31
FR720441A (fr) 1932-02-19
BE381246A (en(2012)) 1931-08-31
NL39550C (en(2012)) 1936-12-15

Similar Documents

Publication Publication Date Title
US2157048A (en) Television system
US2544755A (en) Electron camera tube
US2368884A (en) Television transmitting apparatus
US2403239A (en) Target electrode for electron discharge tubes
US2929866A (en) Television pickup tube
US2945973A (en) Image device
US2415842A (en) Electrooptical device
US2402053A (en) Television transmitter
US2213547A (en) Electron discharge apparatus
US2903596A (en) Image transducers
US2237681A (en) Television transmitting tube
US2277246A (en) Electron discharge device
US2250283A (en) Electron discharge device
US2150168A (en) Electro-optical system
US2339662A (en) Television transmitter
US2262123A (en) Television image pickup system
US2377972A (en) Television transmitting system
US2617058A (en) Television transmitting tube
US2373396A (en) Electron discharge device
US2760096A (en) Television pickup tube
US2506741A (en) Television transmitting tube
US2286280A (en) Electronic device
US2314648A (en) Television transmitting and the like system
US2213177A (en) Television transmitting tube
US2250721A (en) Image storage tube