GB495843A - Electron multipliers - Google Patents
Electron multipliersInfo
- Publication number
- GB495843A GB495843A GB6854/38A GB685438A GB495843A GB 495843 A GB495843 A GB 495843A GB 6854/38 A GB6854/38 A GB 6854/38A GB 685438 A GB685438 A GB 685438A GB 495843 A GB495843 A GB 495843A
- Authority
- GB
- United Kingdom
- Prior art keywords
- emissive
- modulating
- emitting
- electron
- arrangement
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes
Landscapes
- Electron Tubes For Measurement (AREA)
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Amplifiers (AREA)
- Measurement Of Radiation (AREA)
Abstract
495,843. Electron multipliers and circuits therefor. STANDARD TELEPHONES & CABLES, Ltd. May 21, 1937, No. 6854/38. Convention date, July 31, 1936. Divided out of 495,839. [Classes 39 (i) and 40 (v)] Modulation is effected in an electron-multiplier tube by applying one set of currents to the cathode and a control grid and the other set to a secondary-emitting electrode part of which is emissive and part non-emissive, so as to vary the number of electrons falling upon the emitting part. In one arrangement, Fig. 1, low-frequency modulating currents are applied between two of the secondary-emitting electrodes SE4, SE5, the latter having a depressed portion 52 which is non-emissive and on to which about half of the electrons fall when no modulating voltages are applied. In a second arrangement, Fig. 2 (not shown), one terminal of the modulating source is connected to a secondary emitter and the other to a point on the biassing potentiometer. The preceding secondary-emitting electrode is made emissive only over a small central strip (similar to SE2, Fig. 2A), to give a sharp, narrow beam. The high and low frequency circuits may be interchanged or both sources may be of high frequency for heterodyning or detecting purposes. Part of a secondary-emitting electrode may be rendered non-emissive by coating with carbon or by covering with parallel wires 55, Fig. 2A. Specification 495,839 is referred to. The Specification as open to inspection under Sect. 91 comprises also another arrangement, Fig. 3 (Cancelled), in which the modulating potentials are applied to two metal electrodes 57, 58 extending across the electron stream. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US93536A US2205071A (en) | 1936-07-31 | 1936-07-31 | Space discharge apparatus and circuits therefor |
US93546A US2200063A (en) | 1936-07-31 | 1936-07-31 | Space discharge apparatus and circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB495843A true GB495843A (en) | 1938-11-21 |
Family
ID=26787644
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6854/38A Expired GB495843A (en) | 1936-07-31 | 1937-05-21 | Electron multipliers |
GB14180/37A Expired GB493217A (en) | 1936-07-31 | 1937-05-21 | Electron multipliers |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB14180/37A Expired GB493217A (en) | 1936-07-31 | 1937-05-21 | Electron multipliers |
Country Status (4)
Country | Link |
---|---|
US (2) | US2205071A (en) |
FR (1) | FR823940A (en) |
GB (2) | GB495843A (en) |
NL (1) | NL51729C (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE890234C (en) * | 1939-03-29 | 1953-09-17 | Bosch Gmbh Robert | Electron multiplier |
DE758171C (en) * | 1939-04-23 | 1954-04-22 | Otto Dr Peter | Secondary electron multiplier, in which the impact electrodes are capable of secondary emission to different degrees at different points |
US2417805A (en) * | 1941-04-30 | 1947-03-25 | Int Standard Electric Corp | Electric oscillation generator and amplifier |
US2530373A (en) * | 1943-05-04 | 1950-11-21 | Bell Telephone Labor Inc | Ultra high frequency electronic device |
US2424289A (en) * | 1943-07-30 | 1947-07-22 | Rca Corp | Calculating device |
US2458539A (en) * | 1943-08-19 | 1949-01-11 | William H Woodin Jr | Secondary electron emission tube |
US2445568A (en) * | 1943-10-07 | 1948-07-20 | Farnsworth Res Corp | Modulating system |
US2432681A (en) * | 1943-12-02 | 1947-12-16 | Farnsworth Res Corp | Electron multiplier voltage supply |
US2418574A (en) * | 1943-12-20 | 1947-04-08 | Farnsworth Television & Radio | Electron multiplier |
BE463651A (en) * | 1945-03-07 | |||
US2537769A (en) * | 1946-04-02 | 1951-01-09 | Rca Corp | Frequency control |
US2472779A (en) * | 1947-02-17 | 1949-06-07 | Farnsworth Res Corp | Cathode-ray tube amplifier |
US2781969A (en) * | 1951-01-27 | 1957-02-19 | Somerville Alexander | Calculating apparatus |
CA523198A (en) * | 1951-02-15 | 1956-03-27 | Electric And Musical Industries Limited | Cathode ray tubes |
US2836760A (en) * | 1955-03-08 | 1958-05-27 | Egyesuelt Izzolampa | Electron multiplier |
NL97630C (en) * | 1955-06-10 | |||
NL103598C (en) * | 1957-03-13 | |||
US3023342A (en) * | 1958-07-18 | 1962-02-27 | Gen Atronics Corp | Beam modulating devices and method |
US3839674A (en) * | 1970-07-04 | 1974-10-01 | Philips Corp | Device for measuring very small electric currents |
-
1936
- 1936-07-31 US US93536A patent/US2205071A/en not_active Expired - Lifetime
- 1936-07-31 US US93546A patent/US2200063A/en not_active Expired - Lifetime
-
1937
- 1937-05-21 GB GB6854/38A patent/GB495843A/en not_active Expired
- 1937-05-21 GB GB14180/37A patent/GB493217A/en not_active Expired
- 1937-07-05 FR FR823940D patent/FR823940A/en not_active Expired
- 1937-07-15 NL NL83359A patent/NL51729C/xx active
Also Published As
Publication number | Publication date |
---|---|
NL51729C (en) | 1942-01-15 |
US2205071A (en) | 1940-06-18 |
FR823940A (en) | 1938-01-28 |
GB493217A (en) | 1938-10-05 |
US2200063A (en) | 1940-05-07 |
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