GB597532A - Improvements in or relating to electron discharge devices, such as television transmitting tubes - Google Patents

Improvements in or relating to electron discharge devices, such as television transmitting tubes

Info

Publication number
GB597532A
GB597532A GB1779845A GB1779845A GB597532A GB 597532 A GB597532 A GB 597532A GB 1779845 A GB1779845 A GB 1779845A GB 1779845 A GB1779845 A GB 1779845A GB 597532 A GB597532 A GB 597532A
Authority
GB
United Kingdom
Prior art keywords
cathode
image
sheet
film
electron
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
Application number
GB1779845A
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.)
Individual
Original Assignee
Individual
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB597532A publication Critical patent/GB597532A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Abstract

597,532. Cathode-ray tubes electron image tubes. LUBSZYNSKI, H. G. July 12, 1945, No. 17798. [Class 39 (i)] In a television transmitting tube an electron image corresponding to an optical image on photo-electric cathode 5 is projected through a signal plate film 3 and further through an insulating film 2 on to a sheet 1 of conducting glass or material such as enamel of like resistivity and the other side of the sheet is scanned by an electron beam to restore equilibrium potential and provide signals. The image electrons penetrate the films 1 and 2 for suitable potentials applied to cathode 5, conducting film 3 and conducting glass 1, and the cathode 5 may be so close to the composite screen that no electron image focusing arrangements are required. Sheet 1 has resistivity, e.g. 2 X 10<8> to 10<11> ohm cms., and thickness, e.g. 0.001 inch, less than half the scanning spot diameter so that during a frame scanning period the image electrons may spread through from front to back but not considerably laterally. Insulating film 2, which may be 0.0004 inch thick, may be produced by hydrolising ethyl silicate, or evaporating and oxidising aluminium or magnesium, or evaporating an insulator such as a borate or fluoride. And signal plate film 3 may be evaporated aluminium, beryllium or molybdenum 5 to 60 Angstroms thick.
GB1779845A 1945-07-12 Improvements in or relating to electron discharge devices, such as television transmitting tubes Expired GB597532A (en)

Publications (1)

Publication Number Publication Date
GB597532A true GB597532A (en) 1948-01-28

Family

ID=1733418

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1779845A Expired GB597532A (en) 1945-07-12 Improvements in or relating to electron discharge devices, such as television transmitting tubes

Country Status (1)

Country Link
GB (1) GB597532A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2518434A (en) * 1945-07-12 1950-08-08 Emi Ltd Electron discharge device such as a television transmitting tube
DE919235C (en) * 1948-04-13 1954-10-18 Cfcmug Arrangement for television tubes used for dismantling or for receiving images

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2518434A (en) * 1945-07-12 1950-08-08 Emi Ltd Electron discharge device such as a television transmitting tube
DE919235C (en) * 1948-04-13 1954-10-18 Cfcmug Arrangement for television tubes used for dismantling or for receiving images

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