DED0009409MA

DED0009409MA -

Info

Publication number: DED0009409MA
Authority: DE

Description

BUNDESREPUBLIK DEUTSCHLANDFEDERAL REPUBLIC OF GERMANY

Tag der Anmeldung-: 22. Januar 1940 Bekanntgemacht am 4. Oktober 1956Registration date-: January 22, 1940 Advertised on October 4, 1956

DEUTSCHES PATENTAMTGERMAN PATENT OFFICE

Die bekannten Anordnungen, von Kathode und Steuerelektrode in Kathodenstrahlröhren zeigen den häufig sehr störenden Nachteil zu großer Kapazität zwischen beidien sowie: zu großer Wärmeableitung der Kathoden, indem die als Zylinder ausgebildete Steuerelektrode die Kathode fast vollständig eng einhüllt.The known arrangements of cathode and control electrode in cathode ray tubes show the often very annoying disadvantage of too large a capacity between the two as well as: too large Heat dissipation of the cathodes, in that the control electrode, which is designed as a cylinder, is the cathode almost completely enveloped.

Die Erfindung betrifft eins Elektrodenanordnung für eine Kathodenstrahlröhre¹, bei der eine stab-The invention relates to an electrode arrangement for a cathode ray tube ¹ , in which a rod

ίο förmige indirekt geheizte Kathode in der axialen Bohrung eines zylindrischen Isolierkörpers angeordnet ist und als Intensitätssteuerungselektrode eine der Kathodenstirnfläche gegenüberliegende Lochscheibe dient, auf die in der Richtung der ElektiOnenentladung eine koaxial mit der Kathode angeordnete, als Zylindermantel ausgebildete Konzentrationselektrode folgt. Erfindungsgeanäß ist das die Stirnfläche der Kathode umgebende Ende des Isolierkörpers in das der Kathode zugekehrte Ende der Konzentrationselektrode eingepaßt und mit einer Stufenförmigen Aussparung, die als Auflage für die loehscheibemförmige Steuerelektrode 7 dient, versehen, und die in der Bohrung des Isolierkörpers frei stehende Kathode ist an dem ihrer Stirnfläche abgewendeten Ende von einem an' der Außenwand des Isolierkörpers durch eine Schmelzperle 5 befestigten Haltestab¹4 gehalten. 'ίο-shaped indirectly heated cathode is arranged in the axial bore of a cylindrical insulating body and a perforated disk opposite the cathode face serves as the intensity control electrode, followed by a concentration electrode arranged coaxially with the cathode and designed as a cylinder jacket in the direction of the electrical discharge. According to the invention, the end of the insulating body surrounding the end face of the cathode is fitted into the end of the concentration electrode facing the cathode and provided with a step-shaped recess which serves as a support for the control electrode 7 in the form of a lohe disc, and the cathode that is free in the bore of the insulating body is on the end facing away from its end face is held by a holding ^{rod 1} 4 fastened to the outer wall of the insulating body by a fusible bead 5. '

An sich ist es bekannt, Isolierkörper¹ als Träger von Elektroden in. Kathodenstrahlröhren zu benutzen; jedoch sind dieselben nicht so> angeordnet,It is known per se ^{to use insulating bodies 1} as supports for electrodes in cathode ray tubes; but they are not so> arranged

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daß dadurch der obenerwähnte Nachteil vermieden würde. . .that this would avoid the above-mentioned disadvantage. . .

Die Zeichnung zeigt, ein Ausführungsbeispiel der Erfindung. Die indirekt geheizte Kathode besteht aus der Hülse i, der mit der Emissionspaste belegten Scheibe! 2 und, der Heizspirale 3 und ist an dem Stab 4 befestigt, welcher durch die Schmelzperle 5 (z. B. aus Bleiglas) mit dem die Kathode fast vollständig umgebenden Isolierkörper 6 verbunden ist. Gegenüber der Kathode sitzt iin einer Vertiefung des Isolierkörpers die als Scheibenblende ausgebildete Steuerelektrode 7, welche an dem StabS befestigt und, durch die Glasperle 9 mit dem Isolierkörper 6 verbunden ist. Dieser sitzt als Paßstück in der Elektrode 10 und sichert.zugleich den Abstand, zwischen der Steuerelektrode 7 und. der in 10 eingekitteten Elektrode 11. Das ganze· Elektrodensystem ist. auf dem Glasteller 12 aufgebaut, welcher mit dem Gefäß 13 vakuumdicht verbunden. ist.The drawing shows an embodiment of the invention. The indirectly heated cathode exists from the sleeve i, the disc covered with the emission paste! 2 and, the heating coil 3 and is on attached to the rod 4, which through the melting bead 5 (e.g. made of lead glass) is connected to the insulating body 6 which almost completely surrounds the cathode is. Opposite the cathode sits in a recess in the insulating body, which acts as a disc screen formed control electrode 7, which is attached to the rod S and through the glass bead 9 with the insulating body 6 is connected. This one sits as Fitting piece in the electrode 10 and secures.simultaneously the distance between the control electrode 7 and. of the electrode cemented in 10 11. The whole · Electrode system is. built on the glass plate 12, which is connected to the vessel 13 in a vacuum-tight manner. is.

Die Auswahl der Materialien für Haltestäbei, Isolierkörper und, Schmelzperle wird mit Vorteil so. getroffen, daß die Ausdehnungskoeffizienten praktisch, übereinstimmen. VThe selection of the materials for the holding rods, the insulating body and the melting bead is advantageous so. taken that the expansion coefficients practically coincide. V

Durch die beischniebene Anordnung werden die folgenden Vorteile erreicht: Die Kathode berührt den Isolierkörper nur in einem schmalen Ring, hat daher eine kleine Wärmeableitung und erfordert eine geringe Heizleistung. Die Steuerelektrode liegt mit einer kleinen Fläche der Kathode gegenüber, so daß die gegenseitige¹ Kapa,-zität klein ist. Der Isolierkörper schließt: die Kathode fast vollständig ein, so· daß von der Kathode ausgehende Streuelektronen, nicht stören können.The following advantages are achieved due to the adjacent arrangement: The cathode only touches the insulating body in a narrow ring, so it has little heat dissipation and requires little heating power. The control electrode is located with a small area compared with the cathode, so that the mutual ¹ Capa -zität is small. The insulating body: almost completely encloses the cathode, so that stray electrons emanating from the cathode cannot interfere.

Claims

PATENT CLAIMS: -. '.

i. Electrode arrangement for a cathode ray tube, in which a rod-shaped indirectly heated cathode in the axial bore of a cylindrical insulating body-is arranged and; as intensity control electrode one of the Cathode face opposite perforated disc serves, on the in. The direction of the. Electron discharge is arranged coaxially with the cathode and designed as a cylinder jacket Concentration electrode follows, characterized in that the end face, the end of the insulator surrounding the cathode is fitted into the end of the concentration electrode facing the cathode and with a step-shaped. Recess, which serves as a support for the control electrode (7) serves, is provided, and that the free-standing in the bore of the insulator Cathode at the end facing away from its end face of one on the outer wall of the insulating body is held by a melting bead (5) attached holding rod (4).

2. A cathode ray tube ¹ according to claim 1, characterized in that the inner side of the insulating body along a greater part of its axial ^Länge--: has considerably -Increases diameter than the cathode and only on the side remote from the orifice plate side along a very small part of its length is so narrow that the cathode goes straight through it.

3. Cathode ray tube according to claim 2, characterized in that the inside of the Insulator along the greater part of its length is substantially cylindrical and is conically narrowed on the side facing away from the perforated disc.

4. Cathode ray tube according to one or more of the preceding claims, characterized "marked · that the position: the control electrode secured by a lead wire is, which passes through a slot in the insulating body and on it with Is attached using a glass bead.

5. Cathode ray tube, after, one or several of the preceding claims, in which a pinhole in the interior of the cylindrical electrode and, near its one, End is provided, characterized in that the insulating body straight to the perforated diaphragm and at the said. End: the cylindrical. Electrode is attached with the help of a bracket.

6. Cathode ray tube according to one or more of the preceding claims, characterized characterized in that at least a part of the elements of the electrode system of the tube including the said cylindrical ones Electrode, said holding part and said lead wire on support rods is attached, which in a base plate forming the base part of the tubular vessel are embedded directly from pressed glass.

7. Cathode ray tube according to claim 6, characterized in that at least one of the Support rods through the base plate: hindurcbragt and. so. is designed that he is at the same time as Feeder is used.

8. Cathode ray tube after. Claim 7, characterized characterized in that at least one additional feed pin is provided, which is embedded directly in the base plate and protrudes through it.

1 sheet of drawings