FR1001312A - Vacuum adjustment and centering device of a wehnelt cathode filament - Google Patents

Vacuum adjustment and centering device of a wehnelt cathode filament

Info

Publication number
FR1001312A
FR1001312A FR1001312DA FR1001312A FR 1001312 A FR1001312 A FR 1001312A FR 1001312D A FR1001312D A FR 1001312DA FR 1001312 A FR1001312 A FR 1001312A
Authority
FR
France
Prior art keywords
centering device
cathode filament
vacuum adjustment
wehnelt cathode
wehnelt
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
Other languages
French (fr)
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.)
Thales SA
Original Assignee
CSF Compagnie Generale de Telegraphie sans Fil SA
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 CSF Compagnie Generale de Telegraphie sans Fil SA filed Critical CSF Compagnie Generale de Telegraphie sans Fil SA
Application granted granted Critical
Publication of FR1001312A publication Critical patent/FR1001312A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/02—Tubes with a single discharge path
    • H01J21/06—Tubes with a single discharge path having electrostatic control means only
    • H01J21/08—Tubes with a single discharge path having electrostatic control means only with movable electrode or electrodes
    • 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
    • H01J37/067—Replacing parts of guns; Mutual adjustment of electrodes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Electron Sources, Ion Sources (AREA)
FR1001312D 1946-04-15 1946-04-15 Vacuum adjustment and centering device of a wehnelt cathode filament Expired FR1001312A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1001312T 1946-04-15

Publications (1)

Publication Number Publication Date
FR1001312A true FR1001312A (en) 1952-02-22

Family

ID=9561080

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1001312D Expired FR1001312A (en) 1946-04-15 1946-04-15 Vacuum adjustment and centering device of a wehnelt cathode filament

Country Status (3)

Country Link
US (1) US2506660A (en)
FR (1) FR1001312A (en)
GB (1) GB634728A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771568A (en) * 1951-01-31 1956-11-20 Zeiss Carl Utilizing electron energy for physically and chemically changing members
BE555832A (en) * 1956-03-17
US3197665A (en) * 1962-05-11 1965-07-27 Rca Corp Electron gun with positioner for emissive surface of cathode
US4259610A (en) * 1977-09-12 1981-03-31 Tokyo Shibaura Denki Kabushiki Kaisha Electron gun assembly for cathode ray tubes and method of assembling the same
CN110556279A (en) * 2019-08-13 2019-12-10 河南河大科技发展有限公司 Cathode electron gun filament device
JP6943932B2 (en) * 2019-09-10 2021-10-06 日本電子株式会社 Control method of electron microscope and electron microscope

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2208406A (en) * 1938-08-17 1940-07-16 Westinghouse Electric & Mfg Co Cathode ray tube
BE437941A (en) * 1939-02-17 1900-01-01
US2416318A (en) * 1942-08-15 1947-02-25 Standard Telephones Cables Ltd Electron discharge device
BE474126A (en) * 1942-12-01

Also Published As

Publication number Publication date
GB634728A (en) 1950-03-29
US2506660A (en) 1950-05-09

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