US1814805A - Cathode ray device - Google Patents

Cathode ray device Download PDF

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Publication number
US1814805A
US1814805A US409957A US40995729A US1814805A US 1814805 A US1814805 A US 1814805A US 409957 A US409957 A US 409957A US 40995729 A US40995729 A US 40995729A US 1814805 A US1814805 A US 1814805A
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US
United States
Prior art keywords
anode
photoelectric
cathode
ray
cathode 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
US409957A
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English (en)
Inventor
William J Hitchcock
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.)
General Electric Co
Original Assignee
General Electric Co
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
Priority to BE375269D priority Critical patent/BE375269A/xx
Priority to FR706362D priority patent/FR706362A/fr
Application filed by General Electric Co filed Critical General Electric Co
Priority to US409957A priority patent/US1814805A/en
Priority to GB35477/30A priority patent/GB363103A/en
Application granted granted Critical
Publication of US1814805A publication Critical patent/US1814805A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J31/40—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having grid-like image screen through which the electron ray passes and by which the ray is influenced before striking the output electrode, i.e. having "triode action"

Definitions

  • My invention relates to the transmission of pictures or images particularly to cathode ray devices employed therein and has for its principal object the provision of an improved apparatus and method of operation whereby the light-s and shadows of the picture are simultaneously converted into corresponding voltages which are successively transmitted without dangerv of short circuit through the capacity coupling between the various parts and connections of the apparatus.
  • Such devices as hereto ore constructed usually include a cathode, an auxiliary anode for accelerating the cathode ray, a grid, a hotoelectric surface and an anode. It has een proposed to connect the photoelectric surface to some point in the anode circuit of the device and' to divide this surface into a plurality ⁇ of small sections each of which are subjected to a Voltage corresponding to one elemental area of the picture.
  • the capacity of the device be V as small as possible, 1t is desirable that no metallic connection be provided between the small elements of the photoelectric surface and the other parts of the device.
  • the capacity between each element of the photoelectric surface and its surroundings depends on its size and its spacing from neighboring elements and other objects.
  • the resistance between each element and the ground is ⁇ dependent on conduction throu h the element supports, leakage over the sur ace of the supports and the resistance of whatever is effected by the electric charge on the surface.
  • the photo-electric surface is caesium leakage over the surface support is not objectionable as the caesium is referably in the form of a very thin layer.
  • the coating may be vso thin that there is substantially no leakage on the surface of the glass support.
  • a material as silver, copper, acquadag or the like is deposited on a vitreous support such as glass cloth consisting of thin threads so spaced and of such size that they will have little capacity to their surroundings and will be well insulated from each other.
  • each separate element of the surface is not determined by light considerations since an image can be as small as desired without affecting the quantity of light. In order for the capacity to be suiiciently small, however, the surface must be small, yet still large 'enou h to affect whatever it is proposed to control gy the charge on the photo-electric surface.
  • cathode ray which is caused to scan the photo-electric surface.
  • the usev of the cathode ray in this manner would seem to involve conflicting requirements because the ray must be narrow if it is to be sufficiently controlled by a point object Ain its path.
  • the narrownessof the ray, particularly for small anode voltages is secured by introducing gas into the device with the result that positive ions are generated in the path of the electrons and hold them in a pencil which can be made to have a diameter of less than l millimeter.
  • a suitable collector for them and a grid are so mounted with respect to the photoelectric surface that the ray projected from the cathode is slowed down until no positive ions are generated in the space between the grid and the photoelectric surface.
  • Fig. 1 illustrates the construction and circuit arrangement of an apparatus involvingmy invention
  • Fig. 2 illustrates a detailed construction of the photo-electric cathode ray device of Fig. l.
  • the apparatus illustrated by Fig. 1 includes a photo-electric cathode ray device 10, which is provided with a main cathode 11, an auxiliary cathode 12, electrostatic control electrodes 13 and ⁇ 14, control electrodes 15 and 16, a photo-electric surface 17 and an anode 18.
  • the cathodes 11 and 12 are connected in series with a resistor 19 through a lbattery 20, the cathode 12 being maintained at a potential which is more negative than that of the cathode 11.
  • the cathode 11 is associated with a screen 21 and an accelerating anode 22;
  • the cathode 12 is associated wit an accelerating anode 23 and is so arranged that the electrons emitted by it are not con- As previously indicated, it is undesirable that positive ions be produced' in the vicinity of the photoelectric surface 17.
  • the potential .of the photoelectric surface becomes more positive as the intensity of the light to which it is subjected increases.
  • the control members15 and 16 are provided.
  • control electrode 16 is connected to the cathodes 11 and 12 through a potential 'source 24 and that the control electrode 15 is connected to the cathodes through a potential source 25 and the source 24 whereby this electrode is subjected to la 'potential which isv more negative than that of the electrode 16.
  • the potentials applied to the control electrodes 15 Aand 16 should be such that the space etween the electrode 15 and the photoelectric surface 17 and so that the potential of each photoelectric surface shall be a considerable fractionof all potentials acting on the Aelectrons in the space between the electrode 15 and the photoelectric surfaces 17. Under these conditions the charges on the photoelectric surfaces act in the same manner as an electrostatic grid to. control the electrons in their motion toward the anode 18.
  • the electrostatic design of grids for such purposes is well known and needs no discussion.
  • the anode eircuit'of the device 10 includes a resistance 26, a battery 27 and the batteries 24 and 25. This circuit is connected in a well known manner to the input circuit of a radio transmitter 28 though a condenser 29.
  • control electrodes 15 and 16 the photoelectric surface 17 and anode 18 is illustrated by Fig. 2.
  • the electrodes 15 and 16 and the anode 18 may be formed of a plurality of conductors arranged transversely of one another.
  • the photoelectric surface 17 preferably consists of a photoelectric material mounted upon a plurality of conducting surfaces deposited as small-spots on vitreoussupports such as glass cloth.
  • the power output applied to the input i circuit of the radio transmitter is ⁇ ymuch greater than has heretofore been realized.
  • a device including a plurality of cathodes to be maintained at different' potentials, an anode, a photoelectric control element interposed between said anode and cathodes, means for concentrating the ray emitted by one of the said cathodes and means for causing said ray tol scan .said photoelectric element. l 4/ 2'.
  • a device including a plurality of cathodes to be maintained at -different potentials, an anode, a photoelectric control element in terposed between said anode and cathodes, means for concentrating the ray emitted by one of the said cathodes, means for causing said ray to scan said photoelectric element, and means interposed between ⁇ said photoelectric element and said'cathodesfor del celerating said ray.
  • a device including a cathode, an anode, a "photoelectric control' element interposed between said cathode and anode and electrically insulated therefrom, means includ.
  • a device including a cathode, an anode between said cathode and anode and electrically ⁇ insulated therefrom means including a gas for concentrating the ray rojeetedy from said cathode throu h said ⁇ otdelec ⁇ I tric element to said an e,7 means for decelerating saidrayin the vicinity of saidl element, and means including an auxiliary cathode for maintaining the-electric charge of said element.
  • An electrode mount for a cathode ray discharge tube comprising a glassv cloth support, a plurality of conductive surfacesmounted on said support, and a coating of photoelectrie material mounted on said support.

Landscapes

  • Secondary Cells (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Glass Compositions (AREA)
US409957A 1929-11-26 1929-11-26 Cathode ray device Expired - Lifetime US1814805A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE375269D BE375269A (en:Method) 1929-11-26
FR706362D FR706362A (en:Method) 1929-11-26
US409957A US1814805A (en) 1929-11-26 1929-11-26 Cathode ray device
GB35477/30A GB363103A (en) 1929-11-26 1930-11-25 Improvements in and relating to photo-electric apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US409957A US1814805A (en) 1929-11-26 1929-11-26 Cathode ray device

Publications (1)

Publication Number Publication Date
US1814805A true US1814805A (en) 1931-07-14

Family

ID=23622640

Family Applications (1)

Application Number Title Priority Date Filing Date
US409957A Expired - Lifetime US1814805A (en) 1929-11-26 1929-11-26 Cathode ray device

Country Status (4)

Country Link
US (1) US1814805A (en:Method)
BE (1) BE375269A (en:Method)
FR (1) FR706362A (en:Method)
GB (1) GB363103A (en:Method)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415349A (en) * 1940-09-05 1947-02-04 Harries John Henry Owen Electron discharge tube for ultra high frequencies
US2445441A (en) * 1945-12-28 1948-07-20 Rca Corp Rectifier
US2513743A (en) * 1947-01-15 1950-07-04 Rca Corp Electron storage device with grid control action
US2602145A (en) * 1950-08-25 1952-07-01 Rca Corp Control grille assembly for colorkinescopes, etc.
US2603761A (en) * 1951-05-02 1952-07-15 Walter E Angell Cathode-ray tube
US2607900A (en) * 1949-11-03 1952-08-19 Tung Sol Lamp Works Inc Cathode-ray tube
US2798185A (en) * 1954-03-09 1957-07-02 Hughes Aircraft Co Direct-viewing storage tube

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415349A (en) * 1940-09-05 1947-02-04 Harries John Henry Owen Electron discharge tube for ultra high frequencies
US2445441A (en) * 1945-12-28 1948-07-20 Rca Corp Rectifier
US2513743A (en) * 1947-01-15 1950-07-04 Rca Corp Electron storage device with grid control action
US2607900A (en) * 1949-11-03 1952-08-19 Tung Sol Lamp Works Inc Cathode-ray tube
US2602145A (en) * 1950-08-25 1952-07-01 Rca Corp Control grille assembly for colorkinescopes, etc.
US2603761A (en) * 1951-05-02 1952-07-15 Walter E Angell Cathode-ray tube
US2798185A (en) * 1954-03-09 1957-07-02 Hughes Aircraft Co Direct-viewing storage tube

Also Published As

Publication number Publication date
GB363103A (en) 1931-12-17
BE375269A (en:Method)
FR706362A (en:Method) 1931-06-23

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