GB659797A - Improvements in thermionic electron discharge devices - Google Patents

Improvements in thermionic electron discharge devices

Info

Publication number
GB659797A
GB659797A GB2872945A GB2872945A GB659797A GB 659797 A GB659797 A GB 659797A GB 2872945 A GB2872945 A GB 2872945A GB 2872945 A GB2872945 A GB 2872945A GB 659797 A GB659797 A GB 659797A
Authority
GB
United Kingdom
Prior art keywords
tube
head
filament
cathode
columbium
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
GB2872945A
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 GB2872945A priority Critical patent/GB659797A/en
Publication of GB659797A publication Critical patent/GB659797A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)

Abstract

659,797. Thermionic valves; X-ray tubes. BRITISH THOMSON-HOUSTON CO., Ltd. (General Electric Co.). Oct. 30, 1945, No. 28729. [Class 39 (i)] An electron discharge device such as a rectifier, X-ray tube or radio tube comprises a tube 14 with a columbium surface, the upper part of which encloses a filament 10 and serves as a cathode and the lower part 19 of which is less hot in operation and serves as a getter. The tube 14 may be of pure columbium or a tungsten or molybdenum support coated with columbium, and may be heated by radiation and/or by electron bombardment from the filament 10. The cathode and getter portions operate at 1700- 1900‹ K. and 600- 1700 K. respectively. The tube 14 preferably has a closed top 20 as shown to shield the filament 10 from the electrostatic field. The device shown in the drawing is a rectifier, and has a metal or glass envelope (glass as shown). The cup-shaped anode 3 and cathode 14 are supported from sheet-metal members 7 sealed to re-entrant envelope portions 5 at 8. The cathode supporting arrangements comprise metal head 11 carrying a tubular skirt 13 which encloses the seal at the lower end of the envelope, and a stud 12 which supports the head 11. The ends of filament 10 are connected to leads 15, 16 by molybdenum wire wrappings 18, and the leads 15, 16 pass insulatedly through head 11 by means of grommets, the openings in which are sealed by globules of glass, and are connected to further leads 17 which pass through further grommets in the end metal member 7 to the exterior of the device. The tube 4, 19 may be electrically connected to the head 11 so that stud 12 can serve as an electrical lead thereto, or may be insulated from the head in which case it is connected to one of the stems 15,16. One of the stems 15, 16 may be grounded on the head 11, and in this case the tube 4, 19 may be connected to either the grounded or the insulated stem, but if connected to the latter, the tube 4, 19 must also be insulated from head 11. Specification 659,798 is referred to.
GB2872945A 1945-10-30 1945-10-30 Improvements in thermionic electron discharge devices Expired GB659797A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2872945A GB659797A (en) 1945-10-30 1945-10-30 Improvements in thermionic electron discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2872945A GB659797A (en) 1945-10-30 1945-10-30 Improvements in thermionic electron discharge devices

Publications (1)

Publication Number Publication Date
GB659797A true GB659797A (en) 1951-10-31

Family

ID=10280161

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2872945A Expired GB659797A (en) 1945-10-30 1945-10-30 Improvements in thermionic electron discharge devices

Country Status (1)

Country Link
GB (1) GB659797A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1051988B (en) * 1955-03-15 1959-03-05 Philips Nv Electron tubes with means for shielding the bottom part from the anode compartment
CN107182165A (en) * 2017-06-20 2017-09-19 华中科技大学 A kind of plasma emission device based on hot cathode

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1051988B (en) * 1955-03-15 1959-03-05 Philips Nv Electron tubes with means for shielding the bottom part from the anode compartment
CN107182165A (en) * 2017-06-20 2017-09-19 华中科技大学 A kind of plasma emission device based on hot cathode
CN107182165B (en) * 2017-06-20 2024-05-14 华中科技大学 Plasma emission device based on thermionic emission cathode

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