GB213605A - Improvements in or relating to incandescent cathode discharge tubes - Google Patents
Improvements in or relating to incandescent cathode discharge tubesInfo
- Publication number
- GB213605A GB213605A GB7990/24A GB799024A GB213605A GB 213605 A GB213605 A GB 213605A GB 7990/24 A GB7990/24 A GB 7990/24A GB 799024 A GB799024 A GB 799024A GB 213605 A GB213605 A GB 213605A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- heaters
- foot
- relating
- discharge tubes
- 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
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
Landscapes
- Resistance Heating (AREA)
- Solid Thermionic Cathode (AREA)
- Discharge Lamp (AREA)
Abstract
213,605. Naamlooze Vennootschap Philips' Gloeilampenfabrieken. March 29, 1923, [Convention date]. Vacuum tubes. - A cathode containing material emitting electrons at a lower temperature than tungsten is heated by one or more heaters, which, for a small part of their surface, are in direct contact with the cathode, but for a greater part are clear of the cathode. The cathode 5 may consist entirely of alkaline earth oxides or of a good heat conductor such as copper coated with oxides, and is supported by two heaters 11, 12 of high resistance material such as chrome-iron, or nickelchromium alloy, mounted on a foot 2 and connected in parallel by leads 17, 18. One lead for each heater is sealed through the foot and is connected with the secondary of a transformer. A separate lead 10 is provided for the cathode. The points of contact of the heaters with the cathode should be at the same potential so as to avoid the passage of current through the cathode. A grid and anode are mounted concentrically around the cathode.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL213605X | 1923-03-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB213605A true GB213605A (en) | 1924-06-05 |
Family
ID=19778953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7990/24A Expired GB213605A (en) | 1923-03-29 | 1924-03-28 | Improvements in or relating to incandescent cathode discharge tubes |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US1875002A (en) |
| DE (1) | DE478441C (en) |
| FR (1) | FR579100A (en) |
| GB (1) | GB213605A (en) |
| NL (1) | NL17244C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2594897A (en) * | 1945-09-19 | 1952-04-29 | Bell Telephone Labor Inc | Cathode structure for electron discharge tubes |
-
0
- NL NL17244D patent/NL17244C/xx active
-
1924
- 1924-03-17 US US699906A patent/US1875002A/en not_active Expired - Lifetime
- 1924-03-21 DE DEN22995D patent/DE478441C/en not_active Expired
- 1924-03-21 FR FR579100D patent/FR579100A/en not_active Expired
- 1924-03-28 GB GB7990/24A patent/GB213605A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR579100A (en) | 1924-10-09 |
| DE478441C (en) | 1929-07-04 |
| NL17244C (en) | |
| US1875002A (en) | 1932-08-30 |
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