FR1001312A - Vacuum adjustment and centering device of a wehnelt cathode filament - Google Patents
Vacuum adjustment and centering device of a wehnelt cathode filamentInfo
- 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
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)
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)
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)
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 |
-
1946
- 1946-04-15 FR FR1001312D patent/FR1001312A/en not_active Expired
-
1947
- 1947-03-31 GB GB8708/47A patent/GB634728A/en not_active Expired
- 1947-05-16 US US748590A patent/US2506660A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
GB634728A (en) | 1950-03-29 |
US2506660A (en) | 1950-05-09 |
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