GB687157A - Improvements in or relating to cathode ray tubes - Google Patents

Improvements in or relating to cathode ray tubes

Info

Publication number
GB687157A
GB687157A GB772150A GB772150A GB687157A GB 687157 A GB687157 A GB 687157A GB 772150 A GB772150 A GB 772150A GB 772150 A GB772150 A GB 772150A GB 687157 A GB687157 A GB 687157A
Authority
GB
United Kingdom
Prior art keywords
anode
cross
over
cathode
cylinder
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
GB772150A
Inventor
Reginald Alexander Lister Cole
Anthony Victor Krause
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB772150A priority Critical patent/GB687157A/en
Priority to DEI3914A priority patent/DE869100C/en
Priority to FR1044630D priority patent/FR1044630A/en
Publication of GB687157A publication Critical patent/GB687157A/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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/488—Schematic arrangements of the electrodes for beam forming; Place and form of the elecrodes
    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/52—Arrangements for controlling intensity of ray or beam, e.g. for modulation

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

687,157. Cathode-ray tubes. STANDARD TELEPHONES & CABLES, Ltd. March 28, 1950. No. 7721/50. Class 39(i) An electron gun comprises a first anode focusing an electron beam to a first cross-over, a further system reforming the beam to a second cross-over at high potential in the central aperture of a second anode and means for shielding the beam up to first cross-over from extraneous fields and the further system, the electrodes being dimensioned and positioned so that a fully space charge limited beam with a constant cross-section of current density is obtained, and a modulating potential can be applied to the first anode without affecting the position and shape of the first cross-over. The cathode 10 is surrounded by a cylindrical electrode 14 with a flanged base, and the first anode 17 is formed as re-entrant frusto-conical portion of a sheet metal member 18 fitting in a cylinder 13. A centrally apertured shielding disc 19 closes the end of the cylinder 13 and a cylindrical shield electrode 20 with end plate 21 is held in alignment with the cylinder 13 by insulating bridge members 23. A cup-shaped second anode 24, 25 is held in position by ceramic bridges 26, spring fingers 27 spacing the assembly and connecting it to the wall coating of the cathode ray tube in which the gun is mounted. The beam 31 from the cathode is brought to a first cross-over at 32 and to a second cross-over 33 in the aperture of the anode 24. The voltage on cylinders 13, 14 and the first and second anode and the dimensions of the cathode and anode apertures are specified. The second cross-over is focused by magnetic means on to the fluorescent screen of the tube.
GB772150A 1950-03-28 1950-03-28 Improvements in or relating to cathode ray tubes Expired GB687157A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB772150A GB687157A (en) 1950-03-28 1950-03-28 Improvements in or relating to cathode ray tubes
DEI3914A DE869100C (en) 1950-03-28 1951-03-21 Electron gun for cathode ray tubes
FR1044630D FR1044630A (en) 1950-03-28 1951-03-28 Improvements to cathode ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB772150A GB687157A (en) 1950-03-28 1950-03-28 Improvements in or relating to cathode ray tubes

Publications (1)

Publication Number Publication Date
GB687157A true GB687157A (en) 1953-02-11

Family

ID=9838483

Family Applications (1)

Application Number Title Priority Date Filing Date
GB772150A Expired GB687157A (en) 1950-03-28 1950-03-28 Improvements in or relating to cathode ray tubes

Country Status (3)

Country Link
DE (1) DE869100C (en)
FR (1) FR1044630A (en)
GB (1) GB687157A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2201536B1 (en) * 1972-09-26 1976-08-13 Thomson Csf

Also Published As

Publication number Publication date
FR1044630A (en) 1953-11-19
DE869100C (en) 1953-03-02

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