GB923183A - Improvements in and relating to indirectly-heated cathodes - Google Patents
Improvements in and relating to indirectly-heated cathodesInfo
- Publication number
- GB923183A GB923183A GB13666/60A GB1366660A GB923183A GB 923183 A GB923183 A GB 923183A GB 13666/60 A GB13666/60 A GB 13666/60A GB 1366660 A GB1366660 A GB 1366660A GB 923183 A GB923183 A GB 923183A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- filament
- switch
- voltage
- rate
- 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
- H01J1/22—Heaters
-
- 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
- H01J1/135—Circuit arrangements therefor, e.g. for temperature control
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/02—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with tubes only
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microwave Tubes (AREA)
- Solid Thermionic Cathode (AREA)
Abstract
923,183. Thermionic cathodes. EITELMcCULLOUGH Inc. April 19, 1960 [July 16, 1959], No. 13666/60. Class 39 (1). [Also in Group XI] In an electron tube comprising an indirectlyheated cathode 11, the heating filament 17 is caused to emit electrons and a time decreasing voltage is applied between the filament and cathode to cause time decreasing electron bombardment of the cathode, whereby the cathode is quickly raised to its emissive temperature. The filament may be a helix of thoriated tungsten or tungsten, with a carburized coating, arranged in a cylindrical cathode cup, Fig. 1 (not shown). As shown, a capacitor 23 is connected between filament and cathode, and is charged from a D.C. voltage source through a resistor 24 at a rate which approximates the rate at which the cathode loses heat during a cooling cycle, so that switch 31 may be omitted. Initially, switch 29 is in the position shown so that a relatively high voltage is applied across filament 17 causing electron emission. After 0.25 secs. the filament heating voltage is reduced, by movement of switch 29, to a value sufficient to maintain cathode 11 at its operating temperature, electron emission from the filament gradually ceasing.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US827598A US2996643A (en) | 1959-07-16 | 1959-07-16 | Art of heating electron tube cathodes |
Publications (1)
Publication Number | Publication Date |
---|---|
GB923183A true GB923183A (en) | 1963-04-10 |
Family
ID=25249632
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB13666/60A Expired GB923183A (en) | 1959-07-16 | 1960-04-19 | Improvements in and relating to indirectly-heated cathodes |
Country Status (5)
Country | Link |
---|---|
US (1) | US2996643A (en) |
CH (1) | CH366602A (en) |
FR (1) | FR1262893A (en) |
GB (1) | GB923183A (en) |
NL (1) | NL250741A (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL268393A (en) * | 1960-08-19 | |||
US4569198A (en) * | 1983-03-11 | 1986-02-11 | Technion, Incorporated | Heater/emitter assembly |
USRE32918E (en) * | 1983-03-11 | 1989-05-09 | Technion, Inc. | Heater/emitter assembly |
US4730449A (en) * | 1983-07-26 | 1988-03-15 | Technion, Inc. | Radiation transfer thrusters for low thrust applications |
US4675573A (en) * | 1985-08-23 | 1987-06-23 | Varian Associates, Inc. | Method and apparatus for quickly heating a vacuum tube cathode |
DE3768656D1 (en) * | 1986-12-12 | 1991-04-18 | Hughes Aircraft Co | QUICK HEATING ARRANGEMENT FOR A CATHODE. |
US5015908A (en) * | 1989-01-23 | 1991-05-14 | Varian Associates, Inc. | Fast warm-up cathode for high power vacuum tubes |
US7471035B2 (en) * | 2003-08-21 | 2008-12-30 | California Institute Of Technology | Internal conductively-heated cathode |
EP2084728A2 (en) * | 2006-10-17 | 2009-08-05 | Philips Intellectual Property & Standards GmbH | Emitter for x-ray tubes and heating method therefore |
RU2009133830A (en) * | 2009-09-10 | 2011-03-20 | Роман Станиславович Холошенко (RU) | METHOD FOR ELECTRIC POWER STORAGE ACCORDING TO CREATION OF VOLUME CHARGE OF FREE ELECTRONS IN VACUUM AND VACUUM CAPACITOR FOR ITS IMPLEMENTATION |
DE102016215375B4 (en) * | 2016-08-17 | 2023-01-26 | Siemens Healthcare Gmbh | Thermionic emission device |
DE102016215378B4 (en) * | 2016-08-17 | 2023-05-11 | Siemens Healthcare Gmbh | X-ray tube and an X-ray tube with the X-ray tube |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1787300A (en) * | 1927-11-16 | 1930-12-30 | Gen Electric | Electric-discharge device |
US1929369A (en) * | 1931-09-30 | 1933-10-03 | Gen Electric | Electrical discharge device |
US2509053A (en) * | 1947-11-08 | 1950-05-23 | Bell Telephone Labor Inc | Space current device employing mutually bombarded electrodes |
US2552047A (en) * | 1949-04-19 | 1951-05-08 | Rca Corp | Electron discharge device with temperature-stabilized cathode |
US2774916A (en) * | 1951-06-09 | 1956-12-18 | Siemens Ag | Cathodes for electrical discharge devices |
-
0
- NL NL250741D patent/NL250741A/xx unknown
-
1959
- 1959-07-16 US US827598A patent/US2996643A/en not_active Expired - Lifetime
-
1960
- 1960-04-19 GB GB13666/60A patent/GB923183A/en not_active Expired
- 1960-05-12 CH CH545860A patent/CH366602A/en unknown
- 1960-07-12 FR FR832812A patent/FR1262893A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1262893A (en) | 1961-06-05 |
CH366602A (en) | 1963-01-15 |
NL250741A (en) | |
US2996643A (en) | 1961-08-15 |
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