GB518221A - Improvements in or relating to cathode ray tubes - Google Patents

Improvements in or relating to cathode ray tubes

Info

Publication number
GB518221A
GB518221A GB2378638A GB2378638A GB518221A GB 518221 A GB518221 A GB 518221A GB 2378638 A GB2378638 A GB 2378638A GB 2378638 A GB2378638 A GB 2378638A GB 518221 A GB518221 A GB 518221A
Authority
GB
United Kingdom
Prior art keywords
ray tubes
relating
cathode ray
cathode
coils
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
GB2378638A
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.)
Ferranti International PLC
Original Assignee
Ferranti 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 Ferranti PLC filed Critical Ferranti PLC
Priority to GB2378638A priority Critical patent/GB518221A/en
Publication of GB518221A publication Critical patent/GB518221A/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
    • H01J29/84—Traps for removing or diverting unwanted particles, e.g. negative ions, fringing electrons; Arrangements for velocity or mass selection

Landscapes

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

Abstract

518,221. Cathode-ray tubes. FERRANTI, Ltd., MILLER, J. L., and WOOD, H. Aug. 12, 1938, No. 23786. [Class 39 (i)] In order to prevent injury to the screen by ions in a tube having the neck and bulb portions coaxial the beam from the cathode 4 is so focussed by electrodes 5, 6 that the ions are intercepted by a stop 9, while the electrons are by means of coils 14, 15, 16 diverted round the edge of the stop and refocussed on the screen 8, without any alteration of divergence other than is involved in the refocussing. Scanning coils are provided and the coil 16 may act as one of the scanning coils. The refocussing of the beam may be effected electrostatically. Specification 480,948 is referred to.
GB2378638A 1938-08-12 1938-08-12 Improvements in or relating to cathode ray tubes Expired GB518221A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2378638A GB518221A (en) 1938-08-12 1938-08-12 Improvements in or relating to cathode ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2378638A GB518221A (en) 1938-08-12 1938-08-12 Improvements in or relating to cathode ray tubes

Publications (1)

Publication Number Publication Date
GB518221A true GB518221A (en) 1940-02-21

Family

ID=10201293

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2378638A Expired GB518221A (en) 1938-08-12 1938-08-12 Improvements in or relating to cathode ray tubes

Country Status (1)

Country Link
GB (1) GB518221A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2456474A (en) * 1946-07-02 1948-12-14 Gen Electric Electric discharge device
US2460609A (en) * 1946-01-24 1949-02-01 Rca Corp Beam aligning apparatus
US2496127A (en) * 1947-02-05 1950-01-31 Rca Corp Electron gun for cathode-ray tubes
US2515305A (en) * 1946-01-24 1950-07-18 Rca Corp Electromagnet
FR2855321A1 (en) * 2003-05-23 2004-11-26 Thomson Licensing Sa Electron gun ion trap for use in cathode ray tube, has mask electrically connected to electrode, where dimensions of mask in plane perpendicular to axis are lower than dimensions of opening of electrode

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2460609A (en) * 1946-01-24 1949-02-01 Rca Corp Beam aligning apparatus
US2515305A (en) * 1946-01-24 1950-07-18 Rca Corp Electromagnet
US2456474A (en) * 1946-07-02 1948-12-14 Gen Electric Electric discharge device
US2496127A (en) * 1947-02-05 1950-01-31 Rca Corp Electron gun for cathode-ray tubes
FR2855321A1 (en) * 2003-05-23 2004-11-26 Thomson Licensing Sa Electron gun ion trap for use in cathode ray tube, has mask electrically connected to electrode, where dimensions of mask in plane perpendicular to axis are lower than dimensions of opening of electrode

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