GB387275A - Improvements in and relating to cathode ray tubes - Google Patents

Improvements in and relating to cathode ray tubes

Info

Publication number
GB387275A
GB387275A GB25191/32A GB2519132A GB387275A GB 387275 A GB387275 A GB 387275A GB 25191/32 A GB25191/32 A GB 25191/32A GB 2519132 A GB2519132 A GB 2519132A GB 387275 A GB387275 A GB 387275A
Authority
GB
United Kingdom
Prior art keywords
cathode
cylinder
sept
partition
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
GB25191/32A
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
Application filed by General Electric Co filed Critical General Electric Co
Publication of GB387275A publication Critical patent/GB387275A/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

Landscapes

  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

387,275. Cathode-ray tubes. INTERNATIONAL GENERAL ELECTRIC CO., Inc., 120, Broadway, New York, U.S.A.- (Assignees of Allgemeine Elektricitats-Ges. ; 2, Friedrich Karl-Ufer, Berlin.) Sept. 9, 1932, No. 25191. Convention date, Sept. 12, 1931. [Class 39 (i).] An indirectly heated cathode for a cathode-ray tube comprises a hollow metal cylinder 1, Fig. 1, which is divided transversely of its axis by a partition 2 into two portions in the upper of which is arranged a cathode 3 provided with a surface coating of highly emissive material such as barium oxide, while the lower portion contains a heating device arranged in such a manner that the magnetic field of its winding 4 is substantially in the direction of the axis of the cathode ray. The cathode 3 may be in the form of a metal strip folded into a series of zig-zags, the strip in the example being folded in this manner and then wound into a spiral. The upper end of the heating spiral 4 is connected to the bottom of the partition 2, its lower end being led through an aperture in the bottom plate of the cylinder. The other leading-in wire 5 is connected to the cylinder 1. To reduce the external heating effect of the cathode an outer nickel cylinder 8, Fig. 3, with a polished interior wall may surround the cylinder 1, and may be insulated therefrom to enable it to be used as a control grid with a separate leading-in conductor 9. The wall of the cylinder 8 is extended beyond that of cylinder 1 to provide an adequate controlling effect.
GB25191/32A 1931-09-12 1932-09-09 Improvements in and relating to cathode ray tubes Expired GB387275A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE387275X 1931-09-12

Publications (1)

Publication Number Publication Date
GB387275A true GB387275A (en) 1933-02-02

Family

ID=6371107

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25191/32A Expired GB387275A (en) 1931-09-12 1932-09-09 Improvements in and relating to cathode ray tubes

Country Status (2)

Country Link
FR (1) FR742749A (en)
GB (1) GB387275A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2814751A (en) * 1955-03-16 1957-11-26 Eitel Mccullough Inc Stem structure for beam type tubes
EP0022201A1 (en) * 1979-06-21 1981-01-14 Kabushiki Kaisha Toshiba Cathode assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2814751A (en) * 1955-03-16 1957-11-26 Eitel Mccullough Inc Stem structure for beam type tubes
EP0022201A1 (en) * 1979-06-21 1981-01-14 Kabushiki Kaisha Toshiba Cathode assembly
US4370588A (en) * 1979-06-21 1983-01-25 Tokyo Shibaura Denki Kabushiki Kaisha Cathode assembly

Also Published As

Publication number Publication date
FR742749A (en) 1933-03-14

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