GB741946A - Improvements relating to ion suppression in cathode ray apparatus - Google Patents

Improvements relating to ion suppression in cathode ray apparatus

Info

Publication number
GB741946A
GB741946A GB56753A GB56753A GB741946A GB 741946 A GB741946 A GB 741946A GB 56753 A GB56753 A GB 56753A GB 56753 A GB56753 A GB 56753A GB 741946 A GB741946 A GB 741946A
Authority
GB
United Kingdom
Prior art keywords
plates
periods
during
ions
anode
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
GB56753A
Inventor
Derek William Giles
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 GB56753A priority Critical patent/GB741946A/en
Publication of GB741946A publication Critical patent/GB741946A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/84Traps for removing or diverting unwanted particles, e.g. negative ions, fringing electrons; Arrangements for velocity or mass selection

Landscapes

  • Electron Tubes For Measurement (AREA)

Abstract

741,946. Ion-trapping in cathode-ray tubes. FERRANTI, Ltd. Jan. 7, 1954 [Jan. 8, 1953], No. 567/53. Class 39 (1). In a cathode-ray tube with magnetic scanning and in which the beam is almost or wholly extinguished during the fly-back periods, a pair of plate electrodes 2 are provided for deflecting ions from the beam path during and only during these periods; for this purpose they are energized by pulses derived from the magnetic scanning means. As particularly described, the plate electrodes 2 are energized during the fly-back periods by positive or negative going pulses 8 having a magnitude of about 1000 volts, the pulses being obtained from the anode of the output valve of the line timebase. The ions may be deflected sufficiently by a single pulse but preferably are deflected two or more times (in successive fly-back periods). This is possible due to the slow speed of the ions (relative to the electrons) which remain between the ion deflecting plates for two or more fly-back periods. There may be a plurality of pairs of plates 2. During the scanning periods plates 2 are at the same potential, equal to the potential of the first anode 5, i.e. 300 volts. The plates 2 need not, however, be associated with the first anode or even with the gun. The ions are collected by the final anode 10 at 10 kv., by the tube wall or by a " special electrode." The tube is preferably but not necessarily a television receiver; since the electrons are undeflected by the ion trap the picture is not distorted. The scanning means is preferably electromagnetic. The Provisional Specification describes a similar arrangement but in which the plates 2 are disposed between the first and final anodes. The ion deflecting electrodes may be energized by a " special " separate valve stage.
GB56753A 1953-01-08 1953-01-08 Improvements relating to ion suppression in cathode ray apparatus Expired GB741946A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB56753A GB741946A (en) 1953-01-08 1953-01-08 Improvements relating to ion suppression in cathode ray apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB56753A GB741946A (en) 1953-01-08 1953-01-08 Improvements relating to ion suppression in cathode ray apparatus

Publications (1)

Publication Number Publication Date
GB741946A true GB741946A (en) 1955-12-14

Family

ID=9706643

Family Applications (1)

Application Number Title Priority Date Filing Date
GB56753A Expired GB741946A (en) 1953-01-08 1953-01-08 Improvements relating to ion suppression in cathode ray apparatus

Country Status (1)

Country Link
GB (1) GB741946A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003043049A1 (en) * 2001-11-12 2003-05-22 Koninklijke Philips Electronics N.V. Display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003043049A1 (en) * 2001-11-12 2003-05-22 Koninklijke Philips Electronics N.V. Display device

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