GB475928A - Improvements in or relating to television - Google Patents

Improvements in or relating to television

Info

Publication number
GB475928A
GB475928A GB1424336A GB1424336A GB475928A GB 475928 A GB475928 A GB 475928A GB 1424336 A GB1424336 A GB 1424336A GB 1424336 A GB1424336 A GB 1424336A GB 475928 A GB475928 A GB 475928A
Authority
GB
United Kingdom
Prior art keywords
screen
cathode
electrons
velocity
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
Application number
GB1424336A
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries Ltd
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 GB1442234A priority Critical patent/GB442666A/en
Priority to US19752A priority patent/US2244466A/en
Priority to FR789938D priority patent/FR789938A/en
Priority to NL73528A priority patent/NL45020C/xx
Priority to DEE2359D priority patent/DE918753C/en
Application filed by EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB1424336A priority patent/GB475928A/en
Priority to US142554A priority patent/US2225063A/en
Priority to FR48537D priority patent/FR48537E/en
Publication of GB475928A publication Critical patent/GB475928A/en
Expired legal-status Critical Current

Links

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
    • H01J31/30—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at anode potential, e.g. iconoscope
    • 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
    • H01J31/30—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at anode potential, e.g. iconoscope
    • H01J31/32—Tubes with image amplification section, e.g. image-iconoscope, supericonoscope
    • 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
    • H01J31/34—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at cathode potential, e.g. orthicon

Landscapes

  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

475,928. Cathode-ray tubes. ELECTRIC & MUSICAL INDUSTRIES, Ltd., and LUBSZYNSKI, H. G. May 20, 1936, No. 14243. [Class 39 (i)] In transmitting images to a distance as described in Specification 442,666, the mosaic screen 4 is of a material for which the ratio of secondary electrons emitted to primary electrons arriving increases at A above unity and then decreases at B below unity as the velocity of the primary electrons increases. Electrons arrive at the screen 4 from the photo-electric cathode 1 with a velocity between those corresponding to the points A and B, and preferably with the velocity giving maximum secondary emission, to charge the mosaic elements positively and the electrons of the scanning ray 12 have a high velocity above the point B so that the ray reduces the potentials of the element to an equilibrium value. The photo-electrons may be accelerated by a ring 3 joined to the anode 9 of the scanning electron gun and may be focused by a long coil or by a short coil 2 giving magnification or reduction of the electron image. The optical image may be cast obliquely on to the side of the cathode 1 facing the ring 3 or may be cast on to the back of a transparent or grid-like cathode 1, or the cathode 1 and screen 4 may be oblique to the lens 2 and scanning by the ray 12 may then be arranged to compensate for distortions of the image. The elements of the screen 4 are of aluminium, carbon, beryllium or lithium borate ; or material of low workfunction such as zinc sulphide or lithium borate may be deposited on a mica backing. In modifications, the mosaic screen may be replaced by an insulator sheet of transverse resistance above 10<12> ohms per cm. or may comprise nickel elements on a mica sheet. Deposition of caesium on the screen 4 during sensitization of the cathode 1 is avoided by heating the screen, or by temporarily covering it with a flap, during the sensitization.
GB1424336A 1934-05-12 1936-05-20 Improvements in or relating to television Expired GB475928A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
GB1442234A GB442666A (en) 1936-05-20 1934-05-12 Improvements in or relating to television
US19752A US2244466A (en) 1934-05-12 1935-05-04 Television
FR789938D FR789938A (en) 1934-05-12 1935-05-11 Television enhancements
NL73528A NL45020C (en) 1934-05-12 1935-05-11
DEE2359D DE918753C (en) 1934-05-12 1935-05-12 Storage cathode ray scanner with a continuous photocathode layer separated from the mosaic screen
GB1424336A GB475928A (en) 1936-05-20 1936-05-20 Improvements in or relating to television
US142554A US2225063A (en) 1934-05-12 1937-05-14 Television system
FR48537D FR48537E (en) 1934-05-12 1937-05-19 Television enhancements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1424336A GB475928A (en) 1936-05-20 1936-05-20 Improvements in or relating to television

Publications (1)

Publication Number Publication Date
GB475928A true GB475928A (en) 1937-11-22

Family

ID=10037619

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1442234A Expired GB442666A (en) 1934-05-12 1934-05-12 Improvements in or relating to television
GB1424336A Expired GB475928A (en) 1934-05-12 1936-05-20 Improvements in or relating to television

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB1442234A Expired GB442666A (en) 1934-05-12 1934-05-12 Improvements in or relating to television

Country Status (1)

Country Link
GB (2) GB442666A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE884507C (en) * 1934-05-12 1953-07-27 Emi Ltd Storage cathode ray scanner with a cohesive photocathode layer separated from the one-sided or two-sided mosaic screen
DE918755C (en) * 1935-07-06 1954-10-04 Fernseh Gmbh Image dissection tube with photocathode
DE865004C (en) * 1937-08-25 1953-01-29 Interessengemeinschaft Fuer Ru Arrangement for the reproduction of a television picture, the individual elements of which are transmitted on different carrier waves
GB547415A (en) * 1941-02-25 1942-08-26 Arthur Clifford Howard Improvements in and relating to rotary hoeing, cultivating and like agricultural machines

Also Published As

Publication number Publication date
GB442666A (en) 1936-02-12

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