GB675456A - Improvements in or relating to cathodes for electric discharge tubes - Google Patents
Improvements in or relating to cathodes for electric discharge tubesInfo
- Publication number
- GB675456A GB675456A GB25609/50A GB2560950A GB675456A GB 675456 A GB675456 A GB 675456A GB 25609/50 A GB25609/50 A GB 25609/50A GB 2560950 A GB2560950 A GB 2560950A GB 675456 A GB675456 A GB 675456A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- porous
- molybdenum
- welded
- cathode
- 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
- H01J1/28—Dispenser-type cathodes, e.g. L-cathode
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12014—All metal or with adjacent metals having metal particles
- Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
- Y10T428/12063—Nonparticulate metal component
- Y10T428/1209—Plural particulate metal components
Landscapes
- Solid Thermionic Cathode (AREA)
- Powder Metallurgy (AREA)
Abstract
675,456. Making electric components. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Oct. 20, 1950 [Oct. 25, 1949], No. 25609/50. Class 83 (ii). [Also in Group XL (a)] A cathode for an electric discharge tube is internally provided with a supply of alkaline earth metal compounds, the wall of the cathode being constituted at least in part by a homogeneous, porous, sintered body of at least one of the high melting-point metals, tungsten, molybdenum, tantalum, hafnium, and columbium, and the pores of the porous body constituting the largest apertures in the wall of the cathode body, and is characterized in that the porous body is butt-welded to the remaining part of the cathode wall so as to form a supply chamber for the alkaline earth metal compounds. As shown in Fig. 1, the cylindrical, porous, hood 1 contains a supply of alkaline earth metal compounds 2 and is butt-welded to a molybdenum bush 3 along the circular edge 5, a heater 4 being housed in the bush 3. In Fig. 4, the porous body consists of an elongated, cylindrical tube 10 which is closed at one end, and at its open end has welded to it the flange 12 of a molybdenum bush 11 which extends into the tube 10 to form a housing for the materials 2. In Fig. 5 (not shown), a cylindrical, porous tungsten tube surrounds a molybdenum tube, the widened ends of which are butt-welded to the inner side of the porous tube, and in Fig. 6 (not shown), the junction between the tungsten and molybdenum tubes is formed by small rings welded to the tubes. In Fig. 8 (not shown) to obtain more uniform heating a molybdenum bush containing a heater is welded to each of the ends of the cathode, and in Fig. 9 uniform heating is achieved by providing a molybdenum tube 17 with an extension 18 which extends into the porous tungsten tube 1. In Fig. 10 (not shown), the heater is coated with insulating material and arranged in direct contact with the earth metal compounds. Fig. 11 shows a directly-heated cathode in which a porous tube 13 has welded to it two plates 21 provided with wires for connection to the supply.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL292225X | 1949-10-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB675456A true GB675456A (en) | 1952-07-09 |
Family
ID=19782811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25609/50A Expired GB675456A (en) | 1949-10-25 | 1950-10-20 | Improvements in or relating to cathodes for electric discharge tubes |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2673277A (en) |
| BE (1) | BE498869A (en) |
| CH (1) | CH292225A (en) |
| DE (1) | DE837273C (en) |
| FR (1) | FR1026424A (en) |
| GB (1) | GB675456A (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL91413C (en) * | 1951-03-22 | |||
| DE890390C (en) * | 1951-07-12 | 1953-09-17 | Siemens Ag | Cathode for electrical discharge vessels |
| CH315203A (en) * | 1952-03-24 | 1956-07-31 | Siemens Ag | Cathode for electrical discharge vessels |
| US2814754A (en) * | 1952-08-28 | 1957-11-26 | Raytheon Mfg Co | Indirectly-heated cathodes |
| DE1025999B (en) * | 1953-03-04 | 1958-03-13 | Egyesuelt Izzolampa | Supply cathode in which the supply, at least after activation, has a content of barium oxide |
| NL89470C (en) * | 1953-03-04 | |||
| BE544065A (en) * | 1953-08-14 | |||
| NL96853C (en) * | 1953-09-24 | |||
| NL97571C (en) * | 1953-11-18 | |||
| DE1021956B (en) * | 1953-12-22 | 1958-01-02 | Siemens Ag | Process for the production of a cathode for electrical discharge vessels |
| NL183830B (en) * | 1953-12-22 | Unilever Nv | PROCESS FOR THE PREPARATION OF AEROSOL PRODUCTS AND AN AEROSOL FILLED WITH THEM. | |
| NL102345C (en) * | 1954-06-16 | |||
| NL96647C (en) * | 1955-08-23 | |||
| BE561832A (en) * | 1956-10-24 | |||
| JPS5537920A (en) * | 1978-09-11 | 1980-03-17 | Toyota Motor Corp | Production of oxygen sensor element |
| DE2842079A1 (en) * | 1978-09-27 | 1980-04-03 | Siemens Ag | SUPPLY CATHODE, ESPECIALLY METAL CAPILLARY CATHODE |
| EP0272881B1 (en) * | 1986-12-19 | 1995-03-15 | Kabushiki Kaisha Toshiba | Indirectly heated cathode structure for electron tubes |
| KR920004900B1 (en) * | 1990-03-13 | 1992-06-22 | 삼성전관 주식회사 | Impregnated type cathode body and manufacturing the same |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2011121A (en) * | 1934-06-06 | 1935-08-13 | Smith Corp A O | Method of making welded irregular shaped hollow articles |
| US2021119A (en) * | 1934-06-22 | 1935-11-12 | Mccord Radiator & Mfg Co | Method of making pressure cartridges |
| US2121589A (en) * | 1934-06-28 | 1938-06-21 | Westinghouse Electric & Mfg Co | Emissive incandescent cathode |
| US2131204A (en) * | 1936-01-15 | 1938-09-27 | Siemens Ag | Indirectly heated thermionic cathode |
| US2354947A (en) * | 1940-08-30 | 1944-08-01 | Thompson Prod Inc | Hollow head poppet valve |
| US2375808A (en) * | 1943-02-16 | 1945-05-15 | Samuel C Miller | Electrode for luminous tubes |
| US2506747A (en) * | 1946-06-18 | 1950-05-09 | Smith Roger Olof | Device for the end welding of studs |
| BE486002A (en) * | 1947-11-26 | |||
| US2492619A (en) * | 1948-01-02 | 1949-12-27 | Sylvania Electric Prod | Electrical discharge tube |
-
0
- BE BE498869D patent/BE498869A/xx unknown
-
1950
- 1950-10-20 GB GB25609/50A patent/GB675456A/en not_active Expired
- 1950-10-21 US US191341A patent/US2673277A/en not_active Expired - Lifetime
- 1950-10-22 DE DEN3032A patent/DE837273C/en not_active Expired
- 1950-10-23 FR FR1026424D patent/FR1026424A/en not_active Expired
- 1950-10-23 CH CH292225D patent/CH292225A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR1026424A (en) | 1953-04-28 |
| CH292225A (en) | 1953-07-31 |
| US2673277A (en) | 1954-03-23 |
| BE498869A (en) | |
| DE837273C (en) | 1952-04-21 |
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