DE393048C - Electric discharge tubes operated by glow discharge - Google Patents
Electric discharge tubes operated by glow dischargeInfo
- Publication number
- DE393048C DE393048C DEST32089D DEST032089D DE393048C DE 393048 C DE393048 C DE 393048C DE ST32089 D DEST32089 D DE ST32089D DE ST032089 D DEST032089 D DE ST032089D DE 393048 C DE393048 C DE 393048C
- Authority
- DE
- Germany
- Prior art keywords
- discharge
- cathode
- tubes
- discharge tube
- oxide
- 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
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/02—Details
- H01J17/04—Electrodes; Screens
- H01J17/06—Cathodes
- H01J17/066—Cold cathodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2893/00—Discharge tubes and lamps
- H01J2893/0064—Tubes with cold main electrodes (including cold cathodes)
- H01J2893/0065—Electrode systems
- H01J2893/0066—Construction, material, support, protection and temperature regulation of electrodes; Electrode cups
Landscapes
- Discharge Lamp (AREA)
Description
Durch Glimmentladung zu betreibende elektrische Entladungsröhre. Gegenstand der Erfindung ist eine starre, beim Gebrauch -verhältnismäßig kalt bleibende Kathode für Entladungsröhren mit Glimmentladung, welche gestattet, diese Röhren für alle in Betracht kommenden Anwendungsgebiete, z. B. für Beleuchtung, für die drahtlöse Telegraphie und zum Gleichrichten und Umformen von Wechselströmen mit weit geringerer Entladungsspannung zu betreiben als die bekannten Röhren mit starrer und dabei kalter oder nur wenig durch den Durchgang des' Stromes erwärmter Kathode. Die neue Kathode ist der Wehneltkathode sehr ähnlich, also eine Metallkathode, welche Substanzen zur Beförderung der Elektronenemission, entweder auf ihrer Oberfläche aufgebracht oder im Innern verteilt, enthält mit dem Unterschied gegenüber der Wehneltkathod'e, daß sie bei Gebrauch kalt bleibt oder sich nur verhältnismäßig wenig erwärmt. Beispielsweise kann als Kathode für Glimmliehtlampen ein Platindrahtnetz verwendet werden, das in der für Wehneltkathod'en bekannten Weise mit Kalziumoxyd oder ähnlichen Substanzen überzogen ist. Besonders günstig erwiesen sich Netze aus Wolframdraht,.welcher in gleichfalls bei Glühkathoden bekannter Weise bis zu mehreren Prozenten Thoriumoxyd enthält. Lampen dieser Art haben eine besonders niedrige Entladungsspannung, so niedrig, wie man sie bisher nur mit Hilfe von Alkalimetall als Kathode erreichen konnte.Electric discharge tube operated by glow discharge. object of the invention is a rigid cathode that remains relatively cold in use for discharge tubes with glow discharge, which allows these tubes to be used by everyone possible fields of application, e.g. B. for lighting, for wireless Telegraphy and for rectifying and converting alternating currents with far less To operate discharge voltage than the known tubes with more rigid and thereby cold or only a little cathode heated by the passage of the current. The new cathode is very similar to the Wehnelt cathode, i.e. a metal cathode, which substances to promote electron emission, either applied to its surface or distributed inside, contains, in contrast to the Wehneltkathod'e, that it stays cold when in use or only heats up relatively little. For example A platinum wire mesh can be used as the cathode for neon lamps in the manner known for Wehneltkathod'en with calcium oxide or similar substances is covered. Tungsten wire nets, which are used in also in the case of hot cathodes, as is known, up to several percent thorium oxide contains. Lamps of this type have a particularly low discharge voltage, see above low, as it has so far only been achieved with the help of alkali metal as cathode could.
Da die Wirkung eine Oberflächenwirkung ist, tritt sie bei den Metallen, bei welchen die die Emission befördernde Substanz in das Metall eingebettet ist, erst dann richtig auf, wenn die oberste Metallschicht entfernt ist, z. B. durch Zersiäuhen oder durch chemische Wirkung. Lampen, die mit solcher Kathode versehen sind, erreichen meist erst nach einigem Vorbrennen die erwünschte niedrige Entladespannung. Dieses Vorbrennen bis zur Konstanz der Spannung wird daher in den Herstellungsprozeß der Lampe einbezogen. Auch kann man die Elektroden dieser Art vor dem Einschmelzen in die Glasglocke durch Zerstäuben oder auf einem äquivalenten Wege aktivieren.Since the effect is a surface effect, it occurs with the metals, in which the substance promoting the emission is embedded in the metal, only then properly when the top metal layer is removed, z. B. by Disintegration or by chemical action. Lamps provided with such a cathode usually only reach the desired low discharge voltage after some pre-burning. This pre-burning until the voltage is constant is therefore included in the manufacturing process included in the lamp. You can also use the electrodes of this type before melting them down activate into the bell jar by atomization or in an equivalent way.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEST32089D DE393048C (en) | 1919-06-17 | 1919-06-17 | Electric discharge tubes operated by glow discharge |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEST32089D DE393048C (en) | 1919-06-17 | 1919-06-17 | Electric discharge tubes operated by glow discharge |
Publications (1)
Publication Number | Publication Date |
---|---|
DE393048C true DE393048C (en) | 1924-03-28 |
Family
ID=7461721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEST32089D Expired DE393048C (en) | 1919-06-17 | 1919-06-17 | Electric discharge tubes operated by glow discharge |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE393048C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1169593B (en) * | 1960-07-05 | 1964-05-06 | Monsanto Chemicals | High electron emission cathode |
-
1919
- 1919-06-17 DE DEST32089D patent/DE393048C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1169593B (en) * | 1960-07-05 | 1964-05-06 | Monsanto Chemicals | High electron emission cathode |
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