GB507448A - Improvements in or relating to electron multipliers - Google Patents
Improvements in or relating to electron multipliersInfo
- Publication number
- GB507448A GB507448A GB15284/38A GB1528438A GB507448A GB 507448 A GB507448 A GB 507448A GB 15284/38 A GB15284/38 A GB 15284/38A GB 1528438 A GB1528438 A GB 1528438A GB 507448 A GB507448 A GB 507448A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electron
- chamber
- solid
- chambers
- electrons
- 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
- H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
- H01J43/04—Electron multipliers
- H01J43/06—Electrode arrangements
- H01J43/18—Electrode arrangements using essentially more than one dynode
- H01J43/26—Box dynodes
Landscapes
- Electron Tubes For Measurement (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Microwave Tubes (AREA)
Abstract
507,448. Electron multipliers. FARNSWORTH TELEVISION, Inc. May 23, 1938, No. 15284. Convention date, June 22, 1937. [Class 39 (i)] A multiplier comprises a substantially rectangular chamber which has one open side 15, Fig. 3, two solid secondary electron - emissive sides 9, 10 which are opposite and adjacent, respectively, the open side, and an electron permeable wall 14, and means for directing electrons through the permeable wall to impact the solid walls at a point adjacent the junction thereof. A number of chambers are mounted on the pinch 16, Fig. 1, and electrons from a source, e.g. a filamentary cathode 3 surrounded by a control electrode 4, are directed onto the curved edge 24 of the first chamber through an aperture 6 in a shield 5. The aperture is small when used for scanning an electron image. A focusing field is formed between adjacent chambers to concentrate the electrons onto the junction of the solid walls. Flanges 17 screen the gaps between the chambers, and an output electrode 19 is mounted between the last chamber and a secondary-electron-emissive electrode 18. A solid helical member 21, or a coating on the wall, preferably connected to the cathode, absorbs positive ions. The solid walls of the chamber are formed of silver which is oxidized and coated with caesium, and the permeable wall is formÚd of knitted tungsten wire; apertures in the end walls facilitate activation of the secondary-emitting surfaces.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US146641A US2233878A (en) | 1937-06-05 | 1937-06-05 | Electron multiplier |
US149654A US2163966A (en) | 1937-06-05 | 1937-06-22 | Box element multiplier |
Publications (1)
Publication Number | Publication Date |
---|---|
GB507448A true GB507448A (en) | 1939-06-15 |
Family
ID=26844125
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB15284/38A Expired GB507448A (en) | 1937-06-05 | 1938-05-23 | Improvements in or relating to electron multipliers |
GB15283/38A Expired GB515097A (en) | 1937-06-05 | 1938-05-23 | Electron multiplier |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB15283/38A Expired GB515097A (en) | 1937-06-05 | 1938-05-23 | Electron multiplier |
Country Status (3)
Country | Link |
---|---|
US (2) | US2233878A (en) |
FR (1) | FR838909A (en) |
GB (2) | GB507448A (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR853971A (en) * | 1938-11-29 | 1940-04-02 | Materiel Telephonique | Electronic discharge devices |
DE881400C (en) * | 1939-08-21 | 1953-06-29 | Bosch Gmbh Robert | Switching arrangement for electron multiplier |
US2422244A (en) * | 1942-09-19 | 1947-06-17 | Farnsworth Television & Radio | Dissector tube |
DE879426C (en) * | 1942-11-11 | 1953-06-11 | Bosch Gmbh Robert | Space-enclosing electrode, e.g. B. box electrode, for electron multipliers |
US2418574A (en) * | 1943-12-20 | 1947-04-08 | Farnsworth Television & Radio | Electron multiplier |
US2431507A (en) * | 1944-04-03 | 1947-11-25 | Farnsworth Res Corp | Electron multiplier |
US2433724A (en) * | 1944-05-29 | 1947-12-30 | Farnsworth Res Corp | Phototube multiplier |
DE859182C (en) * | 1948-09-28 | 1952-12-11 | Philips Nv | High vacuum tubes with barium oxide cathode |
US2537150A (en) * | 1949-02-25 | 1951-01-09 | Nat Union Radio Corp | Electron multiplier tube |
US2591012A (en) * | 1949-09-17 | 1952-04-01 | Collins Radio Co | Electron tube of the high-frequency and high-power type |
US2824253A (en) * | 1953-11-24 | 1958-02-18 | Itt | Electron multiplier |
US2806141A (en) * | 1954-06-03 | 1957-09-10 | Bendix Aviat Corp | Magnetic electron multiplier switch |
-
1937
- 1937-06-05 US US146641A patent/US2233878A/en not_active Expired - Lifetime
- 1937-06-22 US US149654A patent/US2163966A/en not_active Expired - Lifetime
-
1938
- 1938-05-23 GB GB15284/38A patent/GB507448A/en not_active Expired
- 1938-05-23 GB GB15283/38A patent/GB515097A/en not_active Expired
- 1938-06-04 FR FR838909D patent/FR838909A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2163966A (en) | 1939-06-27 |
GB515097A (en) | 1939-11-27 |
US2233878A (en) | 1941-03-04 |
FR838909A (en) | 1939-03-20 |
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