GB495916A - Improvement in or relating to thermionic cathodes - Google Patents

Improvement in or relating to thermionic cathodes

Info

Publication number
GB495916A
GB495916A GB34133/37A GB3413337A GB495916A GB 495916 A GB495916 A GB 495916A GB 34133/37 A GB34133/37 A GB 34133/37A GB 3413337 A GB3413337 A GB 3413337A GB 495916 A GB495916 A GB 495916A
Authority
GB
United Kingdom
Prior art keywords
electrodes
emissive material
dec
oxide
covered
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
GB34133/37A
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.)
Zeiss Ikon AG
Original Assignee
Zeiss Ikon AG
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 Zeiss Ikon AG filed Critical Zeiss Ikon AG
Publication of GB495916A publication Critical patent/GB495916A/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
    • H01J29/485—Construction of the gun or of parts thereof
    • 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

Landscapes

  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

495,916. Thermionic cathodes. ZEISS IKON AKT.-GES. Dec. 9, 1937, No. 34133. Convention date, Dec. 22, 1936. [Class 39 (i)] Two or more positively biassed electrodes, arranged in front of a heated cavity containing emissive material, prevent the emission of positive ions. A caesium compound embedded in or covered by alkaline-earth oxide may be the emitting material, or the floor of the cavity may be covered with emissive material and the walls with aluminium oxide. The positively biassed electrodes may be grids, or, as shown, emissive material 8 may be deposited on the bases of increasingly positive electrodes 5, 6, 7, the sides of which are lined with an oxide 10. Ceramic spacers 11 are provided. The positively biassed electrodes may serve as lenses or as secondary cathodes. The invention is applicable to Braun tubes.
GB34133/37A 1936-12-22 1937-12-09 Improvement in or relating to thermionic cathodes Expired GB495916A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE495916X 1936-12-22

Publications (1)

Publication Number Publication Date
GB495916A true GB495916A (en) 1938-11-22

Family

ID=6544963

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34133/37A Expired GB495916A (en) 1936-12-22 1937-12-09 Improvement in or relating to thermionic cathodes

Country Status (2)

Country Link
US (1) US2216942A (en)
GB (1) GB495916A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE764127C (en) * 1939-07-09 1954-05-17 Aeg Indirectly heated glow cathode to generate an electron beam with a large current
DE1039140B (en) * 1953-04-02 1958-09-18 Csf Process for the production of supply cathodes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114340124B (en) * 2021-12-30 2024-02-27 中国科学院合肥物质科学研究院 Sodium ion emitter and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE764127C (en) * 1939-07-09 1954-05-17 Aeg Indirectly heated glow cathode to generate an electron beam with a large current
DE1039140B (en) * 1953-04-02 1958-09-18 Csf Process for the production of supply cathodes

Also Published As

Publication number Publication date
US2216942A (en) 1940-10-08

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