GB735463A - Improvements in or relating to electric discharge devices - Google Patents

Improvements in or relating to electric discharge devices

Info

Publication number
GB735463A
GB735463A GB2812452A GB2812452A GB735463A GB 735463 A GB735463 A GB 735463A GB 2812452 A GB2812452 A GB 2812452A GB 2812452 A GB2812452 A GB 2812452A GB 735463 A GB735463 A GB 735463A
Authority
GB
United Kingdom
Prior art keywords
path
helical
coating
insulating surface
deflection
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
GB2812452A
Inventor
Michael Duke Dudley
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 PLC
Original Assignee
General Electric Co 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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB2812452A priority Critical patent/GB735463A/en
Publication of GB735463A publication Critical patent/GB735463A/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
    • H01J29/80—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching
    • 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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/88—Vessels; Containers; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

735,463. Cathode-ray tubes. GENERAL ELECTRIC CO., Ltd. Nov. 6, 1953 [Nov. 7, 1952], No. 28124/52. Class 39 (1). A post-deflection accelerating field in a cathode-ray tube is produced by a helical conductive path of varying width along its length, formed on an insulating surface surrounding the path of the electron beam. The path is maintained at a positive potential and carries a direct current. The field equipotentials are made orthogonal to the electron beam over its range of deflection. The insulating surface may be conical, opening towards or away from the centre of deflection, or planar, extending at right-angles to the mean path of the beam. The planar surface is formed by an apertured disc. The insulating surface may precede the deflecting system, suitable screening ensuring that the accelerating field is produced only in the region between the deflecting system and the target. As shown, the helical path 9 is formed on the conical portion 2 of the envelope. At one end it is in contact with the anode coating 11, and at the other end with the aluminium coating 8 on the fluorescent target. A partspherical gauze may bound the helical path at the end opposite the target. The gauze is coated with carbon to inhibit secondary emission. The conductive path consists of a mixture of kaolin and graphite or lamp black. A coating is deposited on the insulating surface from a suspension in butyl acetate and nitrocellulose. A helical gap is then cut in the coating by a rotatable blade. As the blade rotates it is moved forward by a cam surface shaped to inpart the desired variation in the width of the helical path.
GB2812452A 1952-11-07 1952-11-07 Improvements in or relating to electric discharge devices Expired GB735463A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2812452A GB735463A (en) 1952-11-07 1952-11-07 Improvements in or relating to electric discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2812452A GB735463A (en) 1952-11-07 1952-11-07 Improvements in or relating to electric discharge devices

Publications (1)

Publication Number Publication Date
GB735463A true GB735463A (en) 1955-08-24

Family

ID=10270642

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2812452A Expired GB735463A (en) 1952-11-07 1952-11-07 Improvements in or relating to electric discharge devices

Country Status (1)

Country Link
GB (1) GB735463A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3108906A (en) * 1958-05-24 1963-10-29 Philips Corp Electric discharge tube
US3143681A (en) * 1959-12-07 1964-08-04 Gen Electric Spiral electrostatic electron lens
US3223871A (en) * 1961-08-22 1965-12-14 Gen Electric Electron optical system
US3240973A (en) * 1962-03-01 1966-03-15 Rca Corp Electrostatic saddle field collimating system
US3270234A (en) * 1959-07-30 1966-08-30 Telefunken Ag Cathode ray tube having spiral acceleration anode

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3108906A (en) * 1958-05-24 1963-10-29 Philips Corp Electric discharge tube
US3270234A (en) * 1959-07-30 1966-08-30 Telefunken Ag Cathode ray tube having spiral acceleration anode
US3143681A (en) * 1959-12-07 1964-08-04 Gen Electric Spiral electrostatic electron lens
US3223871A (en) * 1961-08-22 1965-12-14 Gen Electric Electron optical system
US3240973A (en) * 1962-03-01 1966-03-15 Rca Corp Electrostatic saddle field collimating system

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