GB1377544A - Thermionic cathode - Google Patents

Thermionic cathode

Info

Publication number
GB1377544A
GB1377544A GB626472A GB626472A GB1377544A GB 1377544 A GB1377544 A GB 1377544A GB 626472 A GB626472 A GB 626472A GB 626472 A GB626472 A GB 626472A GB 1377544 A GB1377544 A GB 1377544A
Authority
GB
United Kingdom
Prior art keywords
cavity
cathode
feb
heating
circular
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
GB626472A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1377544A publication Critical patent/GB1377544A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/02—Details
    • H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement or ion-optical arrangement
    • H01J37/06—Electron sources; Electron guns
    • H01J37/065—Construction of guns or 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
    • H01J1/15—Cathodes heated directly by an electric current
    • H01J1/16—Cathodes heated directly by an electric current characterised by the shape

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

1377544 Thermionic cathodes PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 10 Feb 1972 [13 Feb 1971] 6264/72 Heading H1D A thermionic cathode comprises an elongate conductor 1 having a cavity 2 in its surface so that a heating current produces maximum heating adjacent the cavity the surface of which constitutes the emissive area. The cathode is a W, Ti, or LaB 6 wire of circular or rectangular cross-section with a circular or elliptical reentrant cavity. Local heating is increased since the cavity radiates less heat than plane surfaces or the wire. With use the cavity increases hence the heating current may be reduced. The cathode is used in electron beam apparatus mounted by ceramic supports in a grid cylinder with the cavity adjacent a non symmetrical aperture in an end plate of the cylinder. The cavity may be formed by spark erosion, electron beam machining or photographic etching through the aperture.
GB626472A 1971-02-13 1972-02-10 Thermionic cathode Expired GB1377544A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7101954A NL7101954A (en) 1971-02-13 1971-02-13

Publications (1)

Publication Number Publication Date
GB1377544A true GB1377544A (en) 1974-12-18

Family

ID=19812480

Family Applications (1)

Application Number Title Priority Date Filing Date
GB626472A Expired GB1377544A (en) 1971-02-13 1972-02-10 Thermionic cathode

Country Status (5)

Country Link
US (1) US3755705A (en)
DE (1) DE2165192A1 (en)
FR (1) FR2125357B1 (en)
GB (1) GB1377544A (en)
NL (1) NL7101954A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012838A1 (en) * 1978-12-22 1980-07-09 International Business Machines Corporation Ion source, especially for ion implantation apparatus
EP0287774A2 (en) * 1987-04-24 1988-10-26 Balzers Aktiengesellschaft Thermionic hair-needle cathode

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1749780A (en) * 1922-01-31 1930-03-11 Westinghouse Lamp Co Incandescent-cathode device
US3462635A (en) * 1966-10-24 1969-08-19 Ibm Holder for highly reactive cathodes of rare-earth borides such as lanthanum hexaboride,the holder provided with a cooling means opposite to the emissive end of the cathode in order to reduce tendency of holder deterioration

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0012838A1 (en) * 1978-12-22 1980-07-09 International Business Machines Corporation Ion source, especially for ion implantation apparatus
EP0287774A2 (en) * 1987-04-24 1988-10-26 Balzers Aktiengesellschaft Thermionic hair-needle cathode
EP0287774A3 (en) * 1987-04-24 1990-03-07 Balzers Aktiengesellschaft Thermionic hair-needle cathode

Also Published As

Publication number Publication date
FR2125357B1 (en) 1975-02-14
NL7101954A (en) 1972-08-15
DE2165192A1 (en) 1972-08-31
US3755705A (en) 1973-08-28
FR2125357A1 (en) 1972-09-29

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee