DE749662C - Rod-shaped, indirectly heated cathode for Braun tubes - Google Patents
Rod-shaped, indirectly heated cathode for Braun tubesInfo
- Publication number
- DE749662C DE749662C DE1937749662D DE749662DD DE749662C DE 749662 C DE749662 C DE 749662C DE 1937749662 D DE1937749662 D DE 1937749662D DE 749662D D DE749662D D DE 749662DD DE 749662 C DE749662 C DE 749662C
- Authority
- DE
- Germany
- Prior art keywords
- rod
- shaped
- indirectly heated
- heated cathode
- face
- 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
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/485—Construction of the gun or of parts thereof
Landscapes
- Resistance Heating (AREA)
Description
Stabförmig ausgebildete, mittelbar geheizte Kathode für Braunsche Röhren Die Erfindung bezieht sich auf eine stabförmig ausgebildete und auf ihrer Stirnseite die emittierende Schicht tragende, mittelbar geheizte Kathode für Braunsche Röhren. Bei den bekannten Kathoden dieser Art befindet sich die Heizwicklung im Innern und gibt ihre Wärme nach allen Seiten ab. Die Wärme jedoch wird nur an der emittierenden Stirnseite ausgenutzt, während die Erwärmung der übrigen Teile nur . einen Verlust darstellt. Durch die Erhitzung der gesamten Schaftlänge der Kathode machen sich außerdem auch starke Längenänderungen geltend, die den Abstand zwischen Kathode und Steuerelektrode verändern und eine Verlagerung der Kennlinie zur Folge haben.Rod-shaped, indirectly heated cathode for Braun's Tubes The invention relates to a rod-shaped and on their The end face of the indirectly heated cathode for Braun's that carries the emitting layer Tubes. In the known cathodes of this type, the heating coil is located in the Inside and gives off its warmth in all directions. The heat, however, is only applied to the emitting end face used, while the heating of the other parts only . represents a loss. By heating the entire length of the cathode shaft In addition, strong changes in length apply, which reduce the distance between Change the cathode and control electrode and result in a shift in the characteristic curve to have.
Diese Nachteile werden bei einer stabförmig ausgebildeten und auf ihrer Stirnseite die emittierende Schicht tragende, mittelbar geheizte Kathode für Braunsche Röhren dadurch beseitigt, daß gemäß der Erfindung an einem stabförmigen Körper aus Isolierstoff ein von Isolierstoff umschlossener zylindrischer Raum, in dem sich der gewendelte Heizdraht befindet, vorgesehen ist, auf den eine an ihrer Stirnseite die emittierende Schicht tragende topfförmige Metallkappe aufgeschoben ist.These disadvantages are in a rod-shaped and on its end face, the emitting layer carrying, indirectly heated cathode for Braun tubes are eliminated in that, according to the invention, on a rod-shaped Body made of insulating material, a cylindrical space enclosed by insulating material, in which is the coiled heating wire, is provided on the one on her On the end face, the cup-shaped metal cap carrying the emitting layer is pushed on is.
In der Abbildung ist ein Ausführungsbeispiel der Erfindung schematisch dargestellt. Hier ist ein stabförmiger Isolierkörper I gezeigt, der zwei Kanäle aufweist, durch die die Heizleitungen in das Innere des Heizraumes geführt werden. Der stabförmige Isolierkörper hat einen rohrförmigen Fortsatz 2, der zusammen mit einer sehr dünnen abschließenden Isolierplatte 3 den Heizraum bildet. In diesem Heizraum ist der Heizdraht 4 untergebracht, und zwar genügen dazu eine oder mehrere. Windungen eines gewendelten Heizdrahtes, die entweder selbsttragend oder auf einem zentralen Fortsatz des Isolierkörpers aufgewickelt sind. Über dem rohrförmigen Fortsatz 2 ist die Metallkappe 5 geschoben, deren äußere Stirnfläche mit der emittierenden Schicht bestrichen ist.In the figure, an embodiment of the invention is schematically shown. A rod-shaped insulating body I is shown here, which has two channels has, through which the heating cables are led into the interior of the boiler room. The rod-shaped insulating body has a tubular extension 2, which together with a very thin final insulating plate 3 forms the boiler room. In this The heating wire 4 is accommodated in the boiler room, and one or more are sufficient for this. Turns of a coiled heating wire, either self-supporting or on a central extension of the insulator are wound. Above the tubular extension 2, the metal cap 5 is pushed, its outer end face with the emitting Layer is coated.
Infolge der sehr viel schlechteren Wärmeleitung des Isoliermaterial., das die Wand und den Boden des Heizraumes bildet, inuß die erzeugte Wärme in der Haupt:,ache durch die Stirnfläche abwandern. Diese wird also heißer als die anderen Teile, bzw. sie erreicht ihre Arbeitstemperatur bei geringerer Heizleistung als bei den bisher bekanntgewordenen Konstruktionen. -Außerdem hat die erfindungsgemäße Konstruktion noch den Vorteil, sehr einfach und entsprechend billig zu sein.As a result of the much poorer thermal conductivity of the insulating material., which forms the wall and the floor of the boiler room, inuss the heat generated in the Main:, ache wander through the frontal area. So this one will be hotter than the others Parts or they reach their working temperature with a lower heating power than in the constructions that have become known so far. -In addition, the inventive Construction still has the advantage of being very simple and correspondingly cheap.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE749662T | 1937-02-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE749662C true DE749662C (en) | 1944-11-29 |
Family
ID=6649408
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1937749662D Expired DE749662C (en) | 1937-02-26 | 1937-02-26 | Rod-shaped, indirectly heated cathode for Braun tubes |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE749662C (en) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE416533C (en) * | 1921-06-14 | 1925-07-17 | Siemens & Halske Akt Ges | Incandescent cathode for high vacuum discharge tubes with a heating element that is heated by an electric current and is arranged within a housing-like part that is closed on all sides |
GB326617A (en) * | 1929-01-25 | 1930-03-20 | Carl Johann Rudiger Hermann Vo | Improvements in thermionic tubes |
GB367825A (en) * | 1930-11-15 | 1932-02-15 | Paul Freedman | Improvements in and relating to thermionic devices |
GB397939A (en) * | 1931-03-07 | 1933-09-07 | Gen Electric | Improvements in and relating to electric discharge devices |
GB411955A (en) * | 1932-01-16 | 1934-06-21 | Kurt Schlesinger | Braun tube |
AT140139B (en) * | 1933-05-30 | 1935-01-10 | Rca Corp | Method and device for modulating electron beams, in particular in cathode ray tubes. |
CH177387A (en) * | 1933-07-29 | 1935-05-31 | Aeg | Indirectly heated cathode, especially for heating with mains voltage. |
GB438343A (en) * | 1934-07-21 | 1935-11-14 | British Thomson Houston Co Ltd | Improvements relating to indirectly heated cathodes for cathode ray tubes |
-
1937
- 1937-02-26 DE DE1937749662D patent/DE749662C/en not_active Expired
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE416533C (en) * | 1921-06-14 | 1925-07-17 | Siemens & Halske Akt Ges | Incandescent cathode for high vacuum discharge tubes with a heating element that is heated by an electric current and is arranged within a housing-like part that is closed on all sides |
GB326617A (en) * | 1929-01-25 | 1930-03-20 | Carl Johann Rudiger Hermann Vo | Improvements in thermionic tubes |
GB367825A (en) * | 1930-11-15 | 1932-02-15 | Paul Freedman | Improvements in and relating to thermionic devices |
GB397939A (en) * | 1931-03-07 | 1933-09-07 | Gen Electric | Improvements in and relating to electric discharge devices |
GB411955A (en) * | 1932-01-16 | 1934-06-21 | Kurt Schlesinger | Braun tube |
AT140139B (en) * | 1933-05-30 | 1935-01-10 | Rca Corp | Method and device for modulating electron beams, in particular in cathode ray tubes. |
CH177387A (en) * | 1933-07-29 | 1935-05-31 | Aeg | Indirectly heated cathode, especially for heating with mains voltage. |
GB438343A (en) * | 1934-07-21 | 1935-11-14 | British Thomson Houston Co Ltd | Improvements relating to indirectly heated cathodes for cathode ray tubes |
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