GB666175A - Improvements in or relating to directly heated cathodes for thermionic valves - Google Patents
Improvements in or relating to directly heated cathodes for thermionic valvesInfo
- Publication number
- GB666175A GB666175A GB1217749A GB1217749A GB666175A GB 666175 A GB666175 A GB 666175A GB 1217749 A GB1217749 A GB 1217749A GB 1217749 A GB1217749 A GB 1217749A GB 666175 A GB666175 A GB 666175A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wires
- cathode
- tungsten
- network
- thermionic
- 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
- 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
- Solid Thermionic Cathode (AREA)
Abstract
666,175. Thermionic valves. M-O VALVE CO., Ltd., and LE ROSSIGNOL, R. May 8, 1950 [May 6, 1949], No. 12177/49. Class 39 (i). A directly-heated cathode for a thermionic valve comprises a squirrelcage structure of which the longitudinal members are regularly crinkled wires adapted to act as electron emitters and intended to operate normally at least 1500‹ C. the wires being interconnected at their ends to form a network in which equal currents will pass through all the wires when a voltage is applied across the network. Fig. 1 shows a cross-section of a cathode with six wires, of which four, 1, 2, 3 and 6, are shown. The wires are preferably shaped so that they lie on the curved surface of an imaginary circular cylinder. At one end all the wires are connected to an annular molybdenum member 7 and at the other end alternate wires are connected respectively to discs 8 and 9 to which leads 13 and 14 are connected. The cathode may have a length of 50 mm. and a diameter of 25 mm. To ensure adequate LW rigidity, if the wires are of tungsten -- should R be less than 200 where L is the total length of one emitting wire, R is its radius of cross-section, and W is the distance between lines joining alternate bends in the wire, all lengths being in centimetres. If the wires are of thoriated LW tungsten --- may be considerably greater than R 200.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL76656D NL76656C (en) | 1949-05-06 | ||
| GB1217749A GB666175A (en) | 1949-05-06 | 1949-05-06 | Improvements in or relating to directly heated cathodes for thermionic valves |
| FR1017164D FR1017164A (en) | 1949-05-06 | 1950-05-06 | Cathodes for thermionic tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1217749A GB666175A (en) | 1949-05-06 | 1949-05-06 | Improvements in or relating to directly heated cathodes for thermionic valves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB666175A true GB666175A (en) | 1952-02-06 |
Family
ID=9999753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1217749A Expired GB666175A (en) | 1949-05-06 | 1949-05-06 | Improvements in or relating to directly heated cathodes for thermionic valves |
Country Status (3)
| Country | Link |
|---|---|
| FR (1) | FR1017164A (en) |
| GB (1) | GB666175A (en) |
| NL (1) | NL76656C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3473073A (en) * | 1966-05-18 | 1969-10-14 | Thomson Houston Comp Francaise | Electron tube having an improved direct-heated cathode structure |
-
0
- NL NL76656D patent/NL76656C/xx active
-
1949
- 1949-05-06 GB GB1217749A patent/GB666175A/en not_active Expired
-
1950
- 1950-05-06 FR FR1017164D patent/FR1017164A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3473073A (en) * | 1966-05-18 | 1969-10-14 | Thomson Houston Comp Francaise | Electron tube having an improved direct-heated cathode structure |
Also Published As
| Publication number | Publication date |
|---|---|
| NL76656C (en) | |
| FR1017164A (en) | 1952-12-03 |
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