EP0130395A1 - Cathode à chauffage rapide - Google Patents
Cathode à chauffage rapide Download PDFInfo
- Publication number
- EP0130395A1 EP0130395A1 EP84106351A EP84106351A EP0130395A1 EP 0130395 A1 EP0130395 A1 EP 0130395A1 EP 84106351 A EP84106351 A EP 84106351A EP 84106351 A EP84106351 A EP 84106351A EP 0130395 A1 EP0130395 A1 EP 0130395A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cathode
- metal layer
- outer conductor
- inner conductor
- cathode according
- 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.)
- Withdrawn
Links
- 239000004020 conductor Substances 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000000919 ceramic Substances 0.000 claims abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 9
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 claims description 2
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims 2
- 239000003513 alkali Substances 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000010953 base metal Substances 0.000 description 4
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/02—Electrodes; Magnetic control means; Screens
- H01J23/04—Cathodes
-
- 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
-
- 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
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/131—Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
- Y10T428/1314—Contains fabric, fiber particle, or filament made of glass, ceramic, or sintered, fused, fired, or calcined metal oxide, or metal carbide or other inorganic compound [e.g., fiber glass, mineral fiber, sand, etc.]
Definitions
- the invention relates to a directly heated oxide cathode, in particular for runtime tubes in pulse mode.
- Directly heated oxide cathodes for electron tubes are known, for example, from DE-AS 2160145 and DE-AS 2904653.
- Such oxide cathodes essentially consist of a cathode body (base metal plate) made of a high-resistance alloy and an electron emission layer.
- the base metal plate is bow-shaped.
- the oxide layer is applied to the outside of the flat part of the base metal plate.
- Connections for the DC voltage source are provided at the ends of the base metal plate facing away from it.
- the invention has for its object to provide a directly heated oxide cathode, especially for runtime tubes, which is characterized by a very short heating time.
- the directly heated oxide cathode shown schematically in section in the figure essentially consists of a cylindrical outer conductor 1.
- An inner conductor 2 is arranged coaxially in this.
- the inner conductor 2 is Rb 1 Lk / 28.6.1983 attached to the outer conductor 1 by a ceramic support disk 3.
- a thin metal layer 4, preferably made of nickel, is provided on one end of the cathode and is soldered to the inner conductor 2 and the outer conductor 1.
- An electron-emitting oxide layer 5, for example barium oxide layer, is applied on the outside of the thin metal layer 4.
- the cathode is designed as a matrix cathode
- nickel powder provided with a binder and preferably sintered is sprayed onto the thin metal layer 4, which preferably consists of nickel.
- the emission mass (oxide layer 5) is then applied.
- Inner conductor 2 and outer conductor 1, which are preferably made of nickel or a nickel alloy, are thick-walled, so that no heating takes place when the current is high.
- the direct current from the inner conductor 2 to the outer conductor flows over the thin-walled Kahtodenblech (metal layer 4) and heats it up quickly.
- the thin metal layer 4 is concave and has an inhomogeneous wall thickness. This measure and a suitable choice of material for the inner and outer conductors can achieve a uniform temperature distribution of the cathode.
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
- Solid Thermionic Cathode (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3323473 | 1983-06-29 | ||
DE19833323473 DE3323473A1 (de) | 1983-06-29 | 1983-06-29 | Schnellheizkathode |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0130395A1 true EP0130395A1 (fr) | 1985-01-09 |
Family
ID=6202710
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84106351A Withdrawn EP0130395A1 (fr) | 1983-06-29 | 1984-06-04 | Cathode à chauffage rapide |
Country Status (3)
Country | Link |
---|---|
US (1) | US4567071A (fr) |
EP (1) | EP0130395A1 (fr) |
DE (1) | DE3323473A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0380205A1 (fr) * | 1989-01-23 | 1990-08-01 | Varian Associates, Inc. | Cathode de chauffage rapide pour tubes à vide de grande puissance |
WO2014064227A1 (fr) * | 2012-10-26 | 2014-05-01 | Thales | Cathode a emission thermoelectronique a demarrage rapide et son procede d'elaboration |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB295637A (en) * | 1927-08-15 | 1929-12-13 | Siegmund Loewe | Heated filament for thermionic valves |
US2847604A (en) * | 1955-06-02 | 1958-08-12 | Gen Electric | Thermionic cathode and direct current heater assembly |
US2875367A (en) * | 1954-10-22 | 1959-02-24 | Gen Electric | Cathode structures |
DE1564951A1 (de) * | 1966-12-19 | 1970-03-05 | Telefunken Patent | Kathodenanordnung |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL113461C (fr) * | 1961-03-08 | |||
DE1223063B (de) * | 1965-06-30 | 1966-08-18 | Siemens Ag | Mittelbar geheizte Kathode fuer elektrische Entladungsgefaesse und Verfahren zur Temperatur-regelung der Kathode |
DE2159626A1 (de) * | 1970-12-04 | 1972-06-22 | Hitachi Ltd | Verfahren zur Herstellung eines Leuchtschirms einer Kathodenstrahlröhre |
JPS4822295B1 (fr) * | 1970-12-04 | 1973-07-05 | ||
JPS5816737B2 (ja) * | 1978-04-24 | 1983-04-01 | 株式会社日立製作所 | 電子管用酸化物陰極 |
JPS5566819A (en) * | 1978-11-15 | 1980-05-20 | Hitachi Ltd | Oxide cathode for electron tube |
JPS5596531A (en) * | 1979-01-19 | 1980-07-22 | Hitachi Ltd | Directly heated cathode for electron tube |
JPS55144631A (en) * | 1979-04-28 | 1980-11-11 | Hitachi Ltd | Directly-heated cathode for electronic tube |
NL8100928A (nl) * | 1981-02-26 | 1982-09-16 | Philips Nv | Oxydkathode. |
-
1983
- 1983-06-29 DE DE19833323473 patent/DE3323473A1/de not_active Withdrawn
-
1984
- 1984-06-04 EP EP84106351A patent/EP0130395A1/fr not_active Withdrawn
- 1984-06-28 US US06/625,720 patent/US4567071A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB295637A (en) * | 1927-08-15 | 1929-12-13 | Siegmund Loewe | Heated filament for thermionic valves |
US2875367A (en) * | 1954-10-22 | 1959-02-24 | Gen Electric | Cathode structures |
US2847604A (en) * | 1955-06-02 | 1958-08-12 | Gen Electric | Thermionic cathode and direct current heater assembly |
DE1564951A1 (de) * | 1966-12-19 | 1970-03-05 | Telefunken Patent | Kathodenanordnung |
Non-Patent Citations (1)
Title |
---|
PATENTS ABSTRACTS OF JAPAN, Band 6, Nr. 211 (E-137)[1089], 23. Oktober 1982; & JP - A - 57 115 739 (TOKYO SHIBAURA DENKI K.K.) 19.07.1982 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0380205A1 (fr) * | 1989-01-23 | 1990-08-01 | Varian Associates, Inc. | Cathode de chauffage rapide pour tubes à vide de grande puissance |
US5015908A (en) * | 1989-01-23 | 1991-05-14 | Varian Associates, Inc. | Fast warm-up cathode for high power vacuum tubes |
WO2014064227A1 (fr) * | 2012-10-26 | 2014-05-01 | Thales | Cathode a emission thermoelectronique a demarrage rapide et son procede d'elaboration |
FR2997548A1 (fr) * | 2012-10-26 | 2014-05-02 | Thales Sa | Cathode a emission thermoelectronique a demarrage rapide et son procede d'elaboration |
Also Published As
Publication number | Publication date |
---|---|
DE3323473A1 (de) | 1985-01-03 |
US4567071A (en) | 1986-01-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): DE GB |
|
17P | Request for examination filed |
Effective date: 19850708 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19860211 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HEYNISCH, HINRICH, DR. RER. NAT.DIPL.-PHYS. Inventor name: GLASS, ERICH, DR.-ING. DIPL.-ING. |