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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 purposes

Info

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
Application number
DET37838D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefunken AG
Original Assignee
Telefunken AG
Priority date (The priority date 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 date listed.)
Publication date
Priority to DET37838D priority Critical patent/DE535163C/en
Application granted granted Critical
Publication of DE535163C publication Critical patent/DE535163C/en
Expired legal-status Critical Current

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)

PATENTANSPRÜCHE: i. Indirekt geheizte Glühkathode für Braunsche Röhren-für Meß- oder Fernseherz-wecke, dadurch gekennzeichnet, daß sie als zylindrische Hohlkathode mit außen isoliert herumgelegter Heizwicklung und mit so enger Bohrung ausgebildet ist, daß die .auf der Innenfläche erzeugten Elektronen bereits als intensives Bündel von geringem Querschnitt a:%,-ial austreten können. PATENT CLAIMS: i. Indirectly heated hot cathode for Braun tubes for Measuring or television purposes, characterized in that it is a cylindrical hollow cathode with an externally insulated heating winding and designed with such a narrow bore is that the .on the inner surface generated electrons already as an intense bundle of small cross-section a:%, - ial can emerge. 2. Anordnung nach Anspruch i, gekennzeichnet durch die Hinzufügung einer an sich bekannten Blende (6), aus deren in der Achse des Emissionskanals belogenen Bohrung der Elektronenstrahl austritt und die gleichzeitig als Sauganode oder .als Steuerelektrode wirken kann.2. Arrangement according to claim i, characterized by the addition of a per se known diaphragm (6) from which in the axis of the emission channel lied to the hole the electron beam emerges and which can act as a suction anode or as a control electrode at the same time.
DET37838D 1929-11-09 Indirectly heated glow cathode for Braun tubes for measuring or television purposes Expired DE535163C (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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