DE592918C - Incandescent cathode tubes for high voltage - Google Patents

Description

GERMAN EMPIRE

ISSUED ON
FEBRUARY 17, 1934

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21g GROUP 13oi

Hot cathode tube for high voltage

Patented in the German Empire on May 9, 1926

The invention relates to hot cathode tubes for high voltage, in which the anode and cathode leads passed through the tube wall at various points are and are ximschlossein by invaginations of the tube walls.

It is already known that with discharge tubes, the glass wall of which is heated at the current feedthroughs with an electrode Provide conductive connected coverings on the glass wall in order to dissipate the heat. Furthermore, it is already known that high-voltage tubes are conductive with one electrode Connected coverings to be provided on the glass wall. Pipes have also already been known in which the anode and cathode leads are passed through the tube wall at the opposite points are and are enclosed by indentations of the tube wall '.

With hot cathode tubes for high voltage, for example with hot cathode valve tubes, spray discharges easily occur on the lead wires to the electrodes.

These are particularly undesirable in the places where the lead wires of parts the vessel wall (glass tubes) are surrounded. Stronger wires or tubes to take for the feed line is not always possible. In addition, with high-voltage tubes the bushings for the anode and the cathode on different parts the vessel wall consisting of an insulating material to be attached to a sufficient Achieve isolation. Most of the time there are leadthroughs for the cathode and the anode on opposite parts of the vessel. If the tube has been in operation for a longer period of time, it can happen that the insulation capacity of the vessel wall made of glass as a result strong heating is considerably reduced, so that between anode and cathode a a certain current flows through the vessel wall. This current has now in the immediate Surrounding the glass penetrating electrode leadthrough in the vessel wall has a considerable density, so that he here an additional warming of the vessel wall can cause, whereby the insulating ability is further reduced.

The disadvantages outlined are avoided in the arrangement according to the invention, that the walls of the indentation which are in contact with the outside air have a conductive one connected to the electrode Have coating.

This arrangement is illustrated using an example in the drawing. 1 is that Glass vessel of a hot cathode valve tube with anode 2 and cathode 3. 4, 5 and 6 are the outgoing electrode

*) The sponsor seeker stated as the inventor:

Dr.-Ing. Dr.-Ing. e. H. Reinhold Rüdenberg in Berlin-Grunewald.

Supply lines; these are located after passing through the wall of the glass vessel within the two glass nozzles 7 and 8. To now a spray discharge at these points to avoid, the glass nozzles 7 and 8 are on their insides with a metallic Cover with the anode lead or with one of the two leads is in direct contact at the cathode. 9 and 10 are still two end caps on the discharge vessel.

The conductive covering can be any Metal, such as silver, platinum, copper, tin, are made, and it can be on any Paths to be made. You can z. B. produce by placing a tin or aluminum foil on the vessel wall or by applying the metal spraying method to the covering

splashes on. Likewise, the covering can be 20 mixed way by means of electrolysis or by electrical means by atomization a glowing wire under tension. The topping should only lie as close as possible to the glass wall 25.

Claims (1)

Claim: Hot cathode tube for high voltage, for the anode and cathode leads are passed through the tube wall at various points and from indentations of the tube walls are enclosed, characterized in that the walls of the indentations which are in communication with the outside air have a conductive coating connected to the electrode. For this purpose χ sheet of drawings