DE535163C - Indirectly heated glow cathode for Braun tubes for measuring or television purposes - Google Patents
Indirectly heated glow cathode for Braun tubes for measuring or television purposesInfo
- Publication number
- DE535163C DE535163C DET37838D DET0037838D DE535163C DE 535163 C DE535163 C DE 535163C DE T37838 D DET37838 D DE T37838D DE T0037838 D DET0037838 D DE T0037838D DE 535163 C DE535163 C DE 535163C
- Authority
- DE
- Germany
- Prior art keywords
- measuring
- indirectly heated
- cathode
- braun tubes
- television purposes
- 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
- Solid Thermionic Cathode (AREA)
Description
Indirekt geheizte Glühkathode für Braunsche Röhren für Meß=_oder Fernseherzwecke Gegenstand der Erfindung ist eine indirekt geheizte Glühkathode für Braunsche Röhren, wie sie sowohl für bekannte Meßzwecke .als auch zur Bildzerlegung bzw. Bildzusammensetzung beim Fernsehen dienen. Die Erfindung ermöglicht es, besonders starke Elektronenströme zu erzeugen, die schon aus der Kathode gut gebündelt und nicht, wie bisher, infolge großer Emissionsfläche zerstreut austreten. Die Gewinnung eines intensiven, helle Lumineszenz liefernden Kathodenstrahls von geringem Querschnitt mit scharfem, auf dem Leuchtschirm erzeugten Lichtfleck ist dadurch erleichtert. Ferner ist die Lebensdauer der Kathode durch diese Anordnung bedeutend erhöht. Die Abbildung zeigt ;ein Ausführungsbeispiel in stark vergrößertem Maßstabe.Indirectly heated hot cathode for Braun tubes for measuring or television purposes The subject of the invention is an indirectly heated hot cathode for Braun tubes, as they are for known measurement purposes as well as for image decomposition or image composition serve while watching television. The invention enables particularly strong electron currents to produce, which is already well bundled from the cathode and not, as before, as a result large emission surface emerge scattered. Obtaining an intense, bright Luminescence emitting cathode ray of small cross-section with sharp, on The light spot generated on the luminescent screen is thereby facilitated. Furthermore, the service life the cathode is significantly increased by this arrangement. The figure shows an exemplary embodiment on a greatly enlarged scale.
i ist ein aus keramischem Material, z. B. reiner Magnesia, hergestellter Hohlkörper, in dessen Innerem die Heizspirale a untergebracht ist. Diese dient mittels Leitung und Strahlung zur Erhitzung der emittierenden Kathodenschicht 3, die sich auf der zylindrischen Innenseite des beschriebenen Körpers befindet. Es handelt sich also um eine indirekt geheizte Hohlkathode, bei der- die Elektronen aus einem Kanal von geringem Querschnitt in den Entladungsraum treten. Die Schicht 3 ist auf der Oberfläche eines metallischen Trägers .4 angeordnet, der Mit der eigentlichen Kathodenzuleitung 5 verbunden ist. Zur Auftragung der Schicht (Oxyde oder äquivalente Mittel) dienen bekannte Methoden. Die keramische Masse des Kathodenkörpers muß bei der Arbeitstemperatur hoch isolierend sein. Eine oben auf der Austrittsseite angeordnete Lochblende 6 kann in ,an sich bekannter Weise dazu dienen:, die Striktion des Elektronenstrahls noch zu verbessern; gleichzeitig kann diese Blende durch ein genügend hohes positives Potential gegenüber ¢ als Sauganode wirken. Sie kann aber ebensogut die Funktion .einer Steuerelektrode ausüben; in diesem Falle ist noch eine besondere Anode zur Beschleunigung der Elektronen für den Durchtritt zum Ablenkraum der Braunsehen Röhre vorzusehen. Geringe Gasmengen in der Röhre können die im Innern der Hohlkathode entstehende Raumladung kompensieren.i is a ceramic material, e.g. B. pure magnesia Hollow body, inside which the heating coil a is housed. This is used by means of Conduction and radiation for heating the emissive cathode layer 3, which located on the cylindrical inside of the body described. It deals So it is an indirectly heated hollow cathode, in which the electrons come from one Pass a channel with a small cross-section into the discharge space. Layer 3 is on the surface of a metallic carrier .4 arranged with the actual Cathode lead 5 is connected. To apply the layer (oxides or equivalent Means) are known methods. The ceramic mass of the cathode body must be the working temperature must be highly insulating. One on top of the exit side Orifice 6 can be used in a manner known per se for: the restriction of the electron beam still to be improved; at the same time this aperture can be given a sufficiently high positive Potential opposite ¢ act as a suction anode. But it can just as well perform the function .exercise a control electrode; in this case there is also a special anode Acceleration of the electrons for the passage to the deflection space of the Braunsehen tube to be provided. Small amounts of gas in the tube can cause the inside of the hollow cathode Compensate the resulting space charge.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DET37838D DE535163C (en) | 1929-11-09 | Indirectly heated glow cathode for Braun tubes for measuring or television purposes |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DET37838D DE535163C (en) | 1929-11-09 | Indirectly heated glow cathode for Braun tubes for measuring or television purposes | |
DE356978X | 1929-11-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE535163C true DE535163C (en) | 1931-10-07 |
Family
ID=25839695
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DET37838D Expired DE535163C (en) | 1929-11-09 | Indirectly heated glow cathode for Braun tubes for measuring or television purposes |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE535163C (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE745678C (en) * | 1932-01-17 | 1944-11-30 | Indirectly heated cathode for Braun tubes | |
DE878510C (en) * | 1932-07-16 | 1953-06-05 | Aeg | Electron beam tubes for sound film and television purposes |
DE760248C (en) * | 1933-11-08 | 1953-10-19 | Georg Seibt Nachf Dr | Indirectly heated cathode for cathode ray tubes |
DE761089C (en) * | 1937-12-31 | 1954-04-29 | Siemens & Halske A G | Indirectly heated glow cathode for Braun tubes |
-
0
- DE DET37838D patent/DE535163C/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE745678C (en) * | 1932-01-17 | 1944-11-30 | Indirectly heated cathode for Braun tubes | |
DE878510C (en) * | 1932-07-16 | 1953-06-05 | Aeg | Electron beam tubes for sound film and television purposes |
DE760248C (en) * | 1933-11-08 | 1953-10-19 | Georg Seibt Nachf Dr | Indirectly heated cathode for cathode ray tubes |
DE761089C (en) * | 1937-12-31 | 1954-04-29 | Siemens & Halske A G | Indirectly heated glow cathode for Braun tubes |
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