GB413766A - Indirectly heated cathode - Google Patents
Indirectly heated cathodeInfo
- Publication number
- GB413766A GB413766A GB3061/33A GB306133A GB413766A GB 413766 A GB413766 A GB 413766A GB 3061/33 A GB3061/33 A GB 3061/33A GB 306133 A GB306133 A GB 306133A GB 413766 A GB413766 A GB 413766A
- Authority
- GB
- United Kingdom
- Prior art keywords
- insulating tube
- feb
- coated
- low temperature
- tube
- 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
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Abstract
413,766. Thermionic cathodes. RADIOAKT.-GES. D. S. LOEWE, 10, Wiesenweg, and WALDSCHMIDT, E., 49, Klingsorstrasse, both in Steglitz, Berlin. Feb. 1, 1933, No. 3061. Convention date, Feb. 2, 1932. [Class 39 (i).] In an indirectlyheated cathode of the type in which the emissive coating is produced by applica. tion of a metal vapour to the equipotential surface, the ends of the insulating tube are maintained at such a low temperature that the emissive layer deposited on them during activation is unable to perform emission. In one form, the heating spiral is straightened at points near the exposed ends of the insulating tube. In a modification, Fig. 3, cooling rings 8 on the insulating tube 3 maintain the ends at a low temperature. The equipotential surface may be made in two parts, the outer one overlapping the inner one at the ends. The ends of the insulating tube may be coated with a substance such as aluminium which absorbs gases discharged from the tube. The ends of the insulating tube may be coated as described in Specification 375,481. Specification 414,375 also is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE413766X | 1932-02-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB413766A true GB413766A (en) | 1934-07-26 |
Family
ID=6444918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3061/33A Expired GB413766A (en) | 1932-02-02 | 1933-02-01 | Indirectly heated cathode |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB413766A (en) |
| NL (1) | NL38926C (en) |
-
0
- NL NL38926D patent/NL38926C/xx active
-
1933
- 1933-02-01 GB GB3061/33A patent/GB413766A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL38926C (en) |
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