GB795146A - Improvements in and relating to thermionic valves - Google Patents

Improvements in and relating to thermionic valves

Info

Publication number
GB795146A
GB795146A GB1071654A GB1071654A GB795146A GB 795146 A GB795146 A GB 795146A GB 1071654 A GB1071654 A GB 1071654A GB 1071654 A GB1071654 A GB 1071654A GB 795146 A GB795146 A GB 795146A
Authority
GB
United Kingdom
Prior art keywords
support
grid
photo
cathode
deposited
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
GB1071654A
Inventor
John Henry Owen Harries
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
Original Assignee
General Electric Co
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 filed Critical General Electric Co
Priority to GB1071654A priority Critical patent/GB795146A/en
Publication of GB795146A publication Critical patent/GB795146A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00Vacuum tubes
    • H01J21/02Tubes with a single discharge path
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00Gas-filled discharge tubes with solid cathode
    • H01J17/38Cold-cathode tubes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/28Non-electron-emitting electrodes; Screens
    • H01J19/38Control electrodes, e.g. grid
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00Discharge tubes and lamps
    • H01J2893/0001Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012Constructional arrangements
    • H01J2893/0015Non-sealed electrodes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00Discharge tubes and lamps
    • H01J2893/0064Tubes with cold main electrodes (including cold cathodes)
    • H01J2893/0065Electrode systems

Abstract

795,146. Thermionic valves. GENERAL ELECTRIC CO. April 1, 1955 [April 12, 1954], No. 10716/54. Class 39(1). A multiple electrode structure for a thermionic valve consists of an integral combination of a cathode electrode 8, Fig. 1, and another electrode 4 for example a control grid, in the form of interconnected areas deposited on a common support 1. In one form the grid is deposited on the top of a number of ridges 2 standing up from the insulating or semi-conducting support 1 and connected at one end in the form of a comb, Fig. 2. A metal layer 7 covers the bottoms of the grooves between the ridges, where it is coated with thermionically emissive material, and also the sides of the support. The upright walls of the grooves, which may be undercut for focusing effect, Fig. 6 (not shown), are coated with a resistive layer 10 to prevent charging. The whole structure is mounted with anode 18, Fig. 4, to form a vacuum or gas-filled disc-sealed valve. The heater 22 may be inside the valve, Fig. 3 (not shown), outside in mere juxtaposition to the cathode, as shown, or wound around an external projection from support 1. The grid is connected to the centre disc 11 by spring contact. The support need not be ridged, the interleaved cathode set 8, Fig. 7, and grid set 6 being then in the same plane. In another form the support is a conductor 34, Fig. 8, on which rests an insulating member 2 carrying the grid 4, the cathode 8 being deposited in the spaces left. The member 2 may be comb-shaped or a plate with a number of spaced apertures, Fig. 12 (not shown). In a multiple valve two or more grids may be simultaneously supported, and the anodes may be mounted in the same way as the grids especially where there is a diode section. The insulating support may be glass or ceramic or an intermediate such as " Photo-Caram " and the grooves may be made by cutting or moulding or, in the latter case, by photo-etching permitting reduction in groove dimensions to the order of 1 mil. The coatings may be applied by stencilling, photo-printing or evaporation, and once deposited may be thickened electrolytically. The Provisional Specification gives further details of the photo-etching and photoprinting processes.
GB1071654A 1954-04-01 1954-04-01 Improvements in and relating to thermionic valves Expired GB795146A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1071654A GB795146A (en) 1954-04-01 1954-04-01 Improvements in and relating to thermionic valves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1071654A GB795146A (en) 1954-04-01 1954-04-01 Improvements in and relating to thermionic valves

Publications (1)

Publication Number Publication Date
GB795146A true GB795146A (en) 1958-05-14

Family

ID=9972966

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1071654A Expired GB795146A (en) 1954-04-01 1954-04-01 Improvements in and relating to thermionic valves

Country Status (1)

Country Link
GB (1) GB795146A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3701919A (en) * 1969-10-06 1972-10-31 Electron Emission Systems Inc Integrated vacuum circuits
EP2282325A3 (en) * 2009-07-29 2011-05-18 General Electric Company Method of fast current modulation in an X-ray tube and apparatus for implementing same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3701919A (en) * 1969-10-06 1972-10-31 Electron Emission Systems Inc Integrated vacuum circuits
EP2282325A3 (en) * 2009-07-29 2011-05-18 General Electric Company Method of fast current modulation in an X-ray tube and apparatus for implementing same
US8027433B2 (en) 2009-07-29 2011-09-27 General Electric Company Method of fast current modulation in an X-ray tube and apparatus for implementing same

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