DE567207C - Indirectly heated glow cathode with a metal foil between an insulator and an emitting substance - Google Patents
Indirectly heated glow cathode with a metal foil between an insulator and an emitting substanceInfo
- Publication number
- DE567207C DE567207C DEM101379D DEM0101379D DE567207C DE 567207 C DE567207 C DE 567207C DE M101379 D DEM101379 D DE M101379D DE M0101379 D DEM0101379 D DE M0101379D DE 567207 C DE567207 C DE 567207C
- Authority
- DE
- Germany
- Prior art keywords
- metal foil
- emitting substance
- insulator
- indirectly heated
- glow 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
Landscapes
- Discharge Lamp (AREA)
Description
Glühkathoden mit indirekter Heizung sind häufig so konstruiert, daß eine isolierende Schicht α von einer Metallfläche b überdeckt und auf diese die emittierende Substanz aufgebracht ist. Das Auftragen der Emissionsmasse ist jedoch mit erheblichen Schwierigkeiten verbunden, weil in der-Kathodenfläche infolge des großen Krümmungsradius ein Zusammenhaften der Masse in sich, wie es bei <o dünnen Drähten eintritt, nicht erreicht werden kann.Incandescent cathodes with indirect heating are often constructed in such a way that an insulating layer α is covered by a metal surface b and the emitting substance is applied to this. However, the application of the emission mass is associated with considerable difficulties, because the mass cannot stick together in the cathode surface due to the large radius of curvature, as occurs with <o thin wires.
Diese Schwierigkeit wird gemäß der Erfindung dadurch behoben, daß eine Folie Verwendung findet, in die die emittierende Substanz eingepreßt ist. Man hat zwar schon versucht, emittierende Substanzen in Glühdrähte einzupressen, jedoch ist dies wegen des geringen Querschnittes und der Empfindlichkeit der Drähte sehr schwierig. Das Einpressen, wie es für indirekt beheizte Kathoden gemäß der Erfindung vorgenommen werden kann, ist insofern technisch bedeutend einfacher, als man Metallfolien zur Verwendung bringt, die an sich eben sind. Eine Einpressung auf einer ebenen Fläche erfordert nur einen Druck in einer einzigen Richtung, und man kann dabei die Menge der einzupressenden Substanz sehr genau beobachten. Ein noch besseres Haften der emittierenden Substanz und gleichzeitig eine Vergrößerung der. Oberfläche erreicht man, wenn man eine Folie verwendet, bei der vor der Aufbringung der emittierenden Substanzen auf der Seite c, wo die emittierenden Substanzen eingepreßt sind, eine rauhe Oberfläche vorhanden ist. Das Aufrauhen von Metallunterlagen bei Oxydkathoden ist zwar scüon bekannt, jedoch wird bei der erfindungsgemäßen Kathode das Aufrauhen der.. M.etallunterlage der Emissionsschicht vorteilhaft besonders aus dem Grunde, weil man die emittierenden Substanzen in die Poren der hier die Metallunterlage bildenden Metallfolie so hineinpressen kann, daß sie mit dem Metall einen fast unlösbaren Zusammenhang bilden.According to the invention, this problem is overcome in that a film is used finds, into which the emitting substance is pressed. Attempts have already been made to press emitting substances into filaments, but this is because of the small cross-section and the sensitivity of the wires very difficult. Pressing in how it can be done for indirectly heated cathodes according to the invention is technically significantly simpler, than using metal foils, which are actually flat. An indentation on a flat surface requires only one push in a single direction, and one can determine the amount of pressure to be pressed Observe the substance very closely. An even better adhesion of the emitting substance and at the same time an enlargement the. Surface can be achieved when using a film prior to application of the emitting substances on side c, where the emitting substances are pressed in there is a rough surface. The roughening of metal substrates Oxide cathodes are already known, but in the case of the cathode according to the invention the roughening of the metal backing of the emission layer is particularly advantageous the reason because the emitting substances get into the pores of the metal base forming metal foil can be pressed in so that they form an almost indissoluble relationship with the metal.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEM101379D DE567207C (en) | Indirectly heated glow cathode with a metal foil between an insulator and an emitting substance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEM101379D DE567207C (en) | Indirectly heated glow cathode with a metal foil between an insulator and an emitting substance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE567207C true DE567207C (en) | 1932-12-29 |
Family
ID=7324565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEM101379D Expired DE567207C (en) | Indirectly heated glow cathode with a metal foil between an insulator and an emitting substance |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE567207C (en) |
-
0
- DE DEM101379D patent/DE567207C/en not_active Expired
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