GB776907A - Improvements in or relating to thermionic cathodes - Google Patents

Improvements in or relating to thermionic cathodes

Info

Publication number
GB776907A
GB776907A GB1817555A GB1817555A GB776907A GB 776907 A GB776907 A GB 776907A GB 1817555 A GB1817555 A GB 1817555A GB 1817555 A GB1817555 A GB 1817555A GB 776907 A GB776907 A GB 776907A
Authority
GB
United Kingdom
Prior art keywords
cathode
shield
electron
main body
face
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
GB1817555A
Inventor
Arnold Hugh William Beck
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.)
STC PLC
Original Assignee
Standard Telephone and Cables 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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1817555A priority Critical patent/GB776907A/en
Publication of GB776907A publication Critical patent/GB776907A/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
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode

Landscapes

  • Electron Sources, Ion Sources (AREA)

Abstract

776,907. Thermionic-cathode tubes; electron beam apparatus. STANDARD TELEPHONES & CABLES, Ltd. June 23, 1955, No. 18175/55. Addition to 750,339. Class 39(1). In a cathode 2 formed from a compressed and sintered mass of refractory metal powder mixed with thermionically emissive material as claimed in the parent Specification the actual emitting surface is very small, being the end surface of a small projecting part 3. This part may be integral with the main body 2, or inset, Fig. 8 (not shown), in which latter case the main body need not contain emissive material. An outer shield 4 surrounds the cathode, which is supported from a tube 1. The shield 4 may be welded to the cathode, or separated therefrom by insulating spacers; it may also act as a heat shield. The end face of the shield may be sloped inwards towards the cathode body, and the end face of the projecting part 3 may also be concave, for electron focusing purposes. Fig. 10 shows the cathode forming part of an electron gun. A concave focusing electrode 12 is secured to the shield 4. The emitting surface of the projection 3 may be in front of, behind, or level with the shield, to suit the required electron optics. The anode comprises a disc 13 having a rearward tubular projection 14 forming an elongated noise-reducing passage for the electron beam.
GB1817555A 1955-06-23 1955-06-23 Improvements in or relating to thermionic cathodes Expired GB776907A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1817555A GB776907A (en) 1955-06-23 1955-06-23 Improvements in or relating to thermionic cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1817555A GB776907A (en) 1955-06-23 1955-06-23 Improvements in or relating to thermionic cathodes

Publications (1)

Publication Number Publication Date
GB776907A true GB776907A (en) 1957-06-12

Family

ID=10107934

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1817555A Expired GB776907A (en) 1955-06-23 1955-06-23 Improvements in or relating to thermionic cathodes

Country Status (1)

Country Link
GB (1) GB776907A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2144261A (en) * 1983-07-29 1985-02-27 Sundstrand Optical Tech Ring laser gyro cathode arrangement
EP1959473A2 (en) * 2003-02-14 2008-08-20 Mapper Lithography IP B.V. Dispenser Cathode

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2144261A (en) * 1983-07-29 1985-02-27 Sundstrand Optical Tech Ring laser gyro cathode arrangement
EP1959473A2 (en) * 2003-02-14 2008-08-20 Mapper Lithography IP B.V. Dispenser Cathode
EP2267747A1 (en) * 2003-02-14 2010-12-29 Mapper Lithography Ip B.V. Lithography system comprising dispenser cathode
EP2293316A1 (en) * 2003-02-14 2011-03-09 Mapper Lithography IP B.V. Dispenser cathode

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