DE832457C - Cold cathode for gas discharge tubes - Google Patents

Cold cathode for gas discharge tubes

Info

Publication number
DE832457C
DE832457C DEH1707A DEH0001707A DE832457C DE 832457 C DE832457 C DE 832457C DE H1707 A DEH1707 A DE H1707A DE H0001707 A DEH0001707 A DE H0001707A DE 832457 C DE832457 C DE 832457C
Authority
DE
Germany
Prior art keywords
cathode
gas discharge
discharge tubes
cold cathode
cylinder
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
DEH1707A
Other languages
German (de)
Inventor
Richard Happ
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.)
Individual
Original Assignee
Individual
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.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DEH1707A priority Critical patent/DE832457C/en
Application granted granted Critical
Publication of DE832457C publication Critical patent/DE832457C/en
Expired legal-status Critical Current

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

Für Gasentladungslampen in Form von Neonröhren für Reklamezwecke oder Leuchtstofflampen mit Kaltkathoden sind Kathoden bekannt, die die Form eines Zylinders haben oder auch sternförmig oder spiralförmig ausgebildet sind. Diese Kathoden haben den Nachteil, daß sie auch bei großer Oberfläche im Verhältnis zur Belastung an der Stirnfläche infolge lonenaufpralles rasch verdampfen und die Röhrenwand schwärzen. Dies kann erfindungsgemäß dadurch verhindert werden, wenn man die eigentliche Kathode mit einem Zylinder umgibt, der je nach Kathodendurchmesser einige Millimeter bis einige "Zentimeter länger als die Kathode gehalten wird und der mit der Kathode leitend verbunden sein kann. Die Kathode selbst bildet man zweckmäßig, um eine große Oberfläche zu erhalten, sternförmig, spiralförmig, gitterförmig oder ähnlich aus. Das Kathodenglimmlicht bildet sich bei diesen Kathoden in den Hohlräumen der Kathode aus, ohne auf den äußeren Zylinder überzugreifen. Da die Wandungen der Hohlräume nur geringen Abstand voneinander haben, schlägt sich das von einer Wand abgedampfte Kathodenmaterial auf der gegenüberliegenden Wand wieder nieder, ohne in die Röhre zu gelangen. Das von der Stirnfläche der Kathode abgedampfte Material schlägt sich auf den überstehenden Teil des äußeren Zylinders nieder und kann somit die Röhrenwand nicht schwärzen. Weiter haben derartige Kathoden den Vorteil, daß sie in ihren äußeren Abmessungen bei gleicher Belastung wesentlich kleiner gehalten «erden können als die bisher bekannten Kathoden.For gas discharge lamps in the form of neon tubes for advertising purposes or Fluorescent lamps with cold cathodes are known cathodes that have the shape of a cylinder have or are star-shaped or spiral-shaped. These cathodes have the disadvantage that they appear even with a large surface in relation to the load evaporate rapidly as a result of ion impact and blacken the tube wall. According to the invention, this can be prevented if the actual cathode surrounds with a cylinder that, depending on the cathode diameter, a few millimeters to a few inches longer than the cathode and the one with the cathode can be conductively connected. The cathode itself is expediently formed around a large one Surface, star-shaped, spiral-shaped, grid-shaped or similar. With these cathodes, the cathode glow forms in the cavities of the cathode without reaching over to the outer cylinder. As the walls of the cavities only have a small distance from each other, the vapor evaporated from a wall beats itself out Cathode material settled on the opposite wall again without getting into the tube to get. The material evaporated from the end face of the cathode beats up on the protruding part of the outer cylinder and can thus the tube wall not blacken. Such cathodes also have the advantage that they are in their outer Dimensions can be kept much smaller with the same load «than the previously known cathodes.

Die Erfindung ist in der Zeichnung vergrößert veranschaulicht.The invention is illustrated enlarged in the drawing.

Die Abbildung zeigt die Kathode i in harmonikaartiger Sternform, also mit Faltflächen, die nach der Erfindung von dem Zylinder 2 umgeben ist, der länger als die Kathode i ist. Die Sternwände beschlagen sich gegenseitig mit dem abgedampften Kathodenmaterial, während das von den Stirnflächen ,I her abdampfende Material sich auf dem überstehenden Zylinderteil 5 niederschlägt und nicht an die Röhrenwand gelangt.The figure shows the cathode i in a harmonica-like star shape, that is with folding surfaces, which is surrounded by the cylinder 2 according to the invention, the longer than the cathode is i. The star walls fog each other with the vaporized Cathode material, while the material evaporating from the end faces, I itself is reflected on the protruding cylinder part 5 and does not reach the tube wall.

In der Abbildung bedeutet i die eigentliche Kathode, die hier sternförmig ausgebildet ist, 2 den überstehenden Zylinder, 3 die Röhrenglaswand.In the figure, i means the actual cathode, which is star-shaped here is formed, 2 the protruding cylinder, 3 the tubular glass wall.

Claims (1)

PATENTANSYRI.CII: Kalte Kathode für Gasentladungsröhren mit großer Kathodenoberfläche, die durch gegeneinander stehende Flächen, wie Faltflächen, Spiralen, Gitter ö. dgl., gebildet ist, dadurch gekennzeichnet, daß die Kathode (i) von einem Zylinder (2) umgeben ist, der die Kathode überragt.PATENTANSYRI.CII: Cold cathode for gas discharge tubes with large Cathode surface, which is caused by opposing surfaces, such as folded surfaces, spirals, Grid o. Like. Is formed, characterized in that the cathode (i) of a Cylinder (2) is surrounded, which protrudes beyond the cathode.
DEH1707A 1950-02-21 1950-02-21 Cold cathode for gas discharge tubes Expired DE832457C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEH1707A DE832457C (en) 1950-02-21 1950-02-21 Cold cathode for gas discharge tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH1707A DE832457C (en) 1950-02-21 1950-02-21 Cold cathode for gas discharge tubes

Publications (1)

Publication Number Publication Date
DE832457C true DE832457C (en) 1952-02-25

Family

ID=7142728

Family Applications (1)

Application Number Title Priority Date Filing Date
DEH1707A Expired DE832457C (en) 1950-02-21 1950-02-21 Cold cathode for gas discharge tubes

Country Status (1)

Country Link
DE (1) DE832457C (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1018164B (en) * 1952-12-04 1957-10-24 Siemens Ag Gas discharge tubes
DE1065091B (en) * 1956-11-22 1959-09-10 Kenneth J Germeshausen Tubular flashlight discharge lamp
DE1128560B (en) * 1960-05-23 1962-04-26 Deutsche Bundespost Arrangement on gas discharge lamps
DE1286630B (en) * 1961-10-09 1969-01-09 Gen Dynamics Corp Induction motor with a flat air gap

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1018164B (en) * 1952-12-04 1957-10-24 Siemens Ag Gas discharge tubes
DE1065091B (en) * 1956-11-22 1959-09-10 Kenneth J Germeshausen Tubular flashlight discharge lamp
DE1128560B (en) * 1960-05-23 1962-04-26 Deutsche Bundespost Arrangement on gas discharge lamps
DE1286630B (en) * 1961-10-09 1969-01-09 Gen Dynamics Corp Induction motor with a flat air gap

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