GB849623A - An improved circuit arrangement for cathode ray tubes - Google Patents

An improved circuit arrangement for cathode ray tubes

Info

Publication number
GB849623A
GB849623A GB77356A GB77356A GB849623A GB 849623 A GB849623 A GB 849623A GB 77356 A GB77356 A GB 77356A GB 77356 A GB77356 A GB 77356A GB 849623 A GB849623 A GB 849623A
Authority
GB
United Kingdom
Prior art keywords
cathode
anode
aperture
ray tubes
cathode 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
GB77356A
Inventor
Kenneth Edward Groves
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB77356A priority Critical patent/GB849623A/en
Publication of GB849623A publication Critical patent/GB849623A/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

Landscapes

  • Particle Accelerators (AREA)

Abstract

849,623. Cathode-ray tubes. ELECTRIC & MUSICAL INDUSTRIES Ltd. Jan. 7, 1957 [Jan. 10, 1956], No. 773/56. Class 39(1). In a cathode-ray tube system using cathode modulation. the aperture in the cathode shield 2, unobstructed by a mesh or the like, is larger in diameter than the aperture in the anode 3 in order to obtain a high value of slope of the modulation characteristic. The cathode shield-anode spacing is 0À006 inch or less, e.g. 0À001 inch, as in Specification 707,064. The anode aperture preferably lies in the plane of the beam cross-over when a maximum modulating potential is applied to the cathode in order to avoid stopping of the beam by the anode aperture. A second anode 4 is provided for electrostatic focusing of the beam, or magnetic focusing may be used. Another advantage of the invention is stated to be the reduction of astigmatism. Suitable voltages and electrode spacings with typical characteristics are given.
GB77356A 1956-01-10 1956-01-10 An improved circuit arrangement for cathode ray tubes Expired GB849623A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB77356A GB849623A (en) 1956-01-10 1956-01-10 An improved circuit arrangement for cathode ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB77356A GB849623A (en) 1956-01-10 1956-01-10 An improved circuit arrangement for cathode ray tubes

Publications (1)

Publication Number Publication Date
GB849623A true GB849623A (en) 1960-09-28

Family

ID=9710278

Family Applications (1)

Application Number Title Priority Date Filing Date
GB77356A Expired GB849623A (en) 1956-01-10 1956-01-10 An improved circuit arrangement for cathode ray tubes

Country Status (1)

Country Link
GB (1) GB849623A (en)

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