GB651386A - Improvements in or relating to cathode ray tubes - Google Patents

Improvements in or relating to cathode ray tubes

Info

Publication number
GB651386A
GB651386A GB32328/48A GB3232848A GB651386A GB 651386 A GB651386 A GB 651386A GB 32328/48 A GB32328/48 A GB 32328/48A GB 3232848 A GB3232848 A GB 3232848A GB 651386 A GB651386 A GB 651386A
Authority
GB
United Kingdom
Prior art keywords
ionization
auxiliary
scanning
tube
ray tubes
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
GB32328/48A
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.)
WILLIAM HUDSPITH BUCHANAN
Cinema Television Ltd
Original Assignee
WILLIAM HUDSPITH BUCHANAN
Cinema Television 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
Application filed by WILLIAM HUDSPITH BUCHANAN, Cinema Television Ltd filed Critical WILLIAM HUDSPITH BUCHANAN
Priority to GB32328/48A priority Critical patent/GB651386A/en
Priority to US128533A priority patent/US2593261A/en
Priority to FR1001095D priority patent/FR1001095A/en
Publication of GB651386A publication Critical patent/GB651386A/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
    • H01J29/94—Selection of substances for gas fillings; Means for obtaining or maintaining the desired pressure within the tube, e.g. by gettering

Landscapes

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

Abstract

651,386. Cathode-ray tubes. CINEMATELEVISION, Ltd., and BUCHANAN, W. H. Dec. 14, 1948, No. 32328. [Class 39 (i)] To prevent the defocusing of the scanning beams of high-vacuum cathode-ray tubes, especially those used in television reception, due to the varying beam current affecting the ionization of the residual gases within the tube, auxiliary measure provided for producing ionization of the tube gases. The anode 4 of the scanning beam 2 has an annular flange 5 carrying an auxiliary electron gun comprising a ring-shaped electron source 7, an annular beam concentrating electrode 8, and an accelerating electrode 9. The annular auxiliary beam 6 is composed of low velocity electrons which are caused to describe helical paths by the focusing field of the scanning beam, whereby the gases are ionized. The auxiliary beam 6 may ionize such a large proportion of the gas molecules that any additional ionization by the scanning beam 2 is of negligible -effect, or, alternatively, the beam 6 may be modulated in the opposite sense to that of the scanning beam 2 by applying a potential to the concentrating or accelerating electrodes 8, 9, whereby the ionization is maintained substantially constant. Numerical values of voltages which can be applied to the tube electrodes are given in the Specification.
GB32328/48A 1948-12-14 1948-12-14 Improvements in or relating to cathode ray tubes Expired GB651386A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB32328/48A GB651386A (en) 1948-12-14 1948-12-14 Improvements in or relating to cathode ray tubes
US128533A US2593261A (en) 1948-12-14 1949-11-21 Cathode-ray tube
FR1001095D FR1001095A (en) 1948-12-14 1949-12-08 Improvements to cathode ray tubes and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB32328/48A GB651386A (en) 1948-12-14 1948-12-14 Improvements in or relating to cathode ray tubes

Publications (1)

Publication Number Publication Date
GB651386A true GB651386A (en) 1951-03-14

Family

ID=10336895

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32328/48A Expired GB651386A (en) 1948-12-14 1948-12-14 Improvements in or relating to cathode ray tubes

Country Status (3)

Country Link
US (1) US2593261A (en)
FR (1) FR1001095A (en)
GB (1) GB651386A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2858364A (en) * 1953-05-12 1958-10-28 Philco Corp Cathode ray tube systems
US2827591A (en) * 1954-12-23 1958-03-18 Sylvania Electric Prod Cathode ray scanning systems
GB821542A (en) * 1955-02-12 1959-10-07 Emi Ltd Improvements in or relating to cathode ray tubes
US2919380A (en) * 1957-07-23 1959-12-29 Philco Corp Electron discharge devices

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2114136A (en) * 1932-01-06 1938-04-12 Rca Corp Cathode ray tube
US2014539A (en) * 1933-04-15 1935-09-17 Cutler Hammer Inc Electron tube
US2406370A (en) * 1938-07-08 1946-08-27 Univ Leland Stanford Junior Electronic oscillator-detector
US2504231A (en) * 1945-10-26 1950-04-18 Raytheon Mfg Co Gaseous discharge device
US2459724A (en) * 1946-11-27 1949-01-18 Farnsworth Res Corp Astatic cathode-ray tube
US2457175A (en) * 1946-12-19 1948-12-28 Fed Telecomm Lab Inc Projection cathode-ray tube

Also Published As

Publication number Publication date
US2593261A (en) 1952-04-15
FR1001095A (en) 1952-02-19

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