US1932635A - Electrode connection for discharge tubes - Google Patents

Description

Oct. 31, 1933. H} MULLER 1,932,635

ELECTRODE CONNECTION FOR DISCHARGE TUBES Filed April 6, 1927 INVENTOR Q HANS MULLER BY /LZ ATTORNEY Patented Oct. 31, 1933 UNITED STATES PATENT OFFICE ELECTRODE CONNECTION FOR DISCHARGE TUBES Application April 6, 1927, Serial No. 181,394, and in Germany April 24, 1926 Claims.

5 In one method of building dish-shaped or flared on the metal ring 9.

tubes the grid is secured or attached to the tube by the aid of a metallic ring, while a separate current supply lead to the grid is provided, for instance, by means of a wire lead-in sealed lat- 0 orally in the tube. In the case of tubes of comparatively large power this sort of grid lead-in is unsuited because of the large grid currents carried by the lead-in. For this reason the current supply has been connected to the metallic caps or metallic rings which are sealed in the tube as part of the tube wall.

The invenion relates to a particularly suitable construction of welded-in or sealed-in current leads. The leads may also serve as a support or carrier for the grid structure or other electrodes.

One embodiment of the invention is illustrated in the drawing, although it is to be herein understood that I do not desire to limit myself to the exact structure shown and my invention applies equally well to an anode or cathode mounting or a mounting of all the electrodes. Fig. 1 shows a transmitter tube. Fig. 2 drawn to an enlarged scale shows the essential features of a tube in accordance with this invention. The wall 1 of the tube is made of glass and the cylindrical part 3 is made from metal and serves as a watercooled plate or anode. Although the drawing discloses the anode as part of the tube wall, it is obvious nevertheless that the anode may be inserted within the exhausted tube and form no part of the tube wall.

The glass wall 1 of the tube is flared inwardly at 14 and one end of the metallic ring 9 is sealed or welded thereto. A flared or dished glass cap 2 is sealed to the other end of ring 9 which makes a completely enclosed tube with the ring 9 as part of the tube wall. As shown in enlarged Fig. 2 the ring 9 may be externally threaded and the grid supporting element 11 may be screwed thereto.

The cathode filament 4 may be wound loop or helix fashion and is supported by two holder or anchor wires 5 and 6 passed thru the bottom of the flared cap 2. It is further supported in an elastic and insulated manner from the grid supporting wire 7 by means of the elastic element 12 and the insulating body 13. The said supporting wire 7 which carries the grid is secured A metallic cylinder 10 may be united with the ring 9 by an internal screw thread in the ring 9, said metal cylinder 10 being united with those parts of the arrangement whose potential is to be imparted to the grid.

The invention lies in the metallic ring 9 or a plurality of such rings being a part of the tube wall. These rings may be made of copper or other metal and are welded into the flared cap 2. The ring serves as a support for the grid structure in that the carrier or anchor wires 7-7 are attached thereto, as well as to permit a large flow of current to the grid. The advantage of this arrangement resides in providing a single element in the tube for attaching the grid or any electrode structure; in eliminating lead wires passing through the glass walls and also in providing large conducting bodies for the passage of large current to the grid 01' other electrode.

What is claimed is:

1. An electron discharge device comprising an enclosure having an inwardly projecting stem, a metal ring hermetically sealed at one end to said stem, a cup-shaped insulating member hermetically sealed to the other end of said ring member, a plurality of electrodes within the enclosure, leads extending from one of said electrodes to said ring, and a conductor connecting said ring with an external source of potential.

2. An electron discharge device comprising an enclosure having an inwardly projecting glass stem, an internally and externally threaded metallic ring having one end hermitically sealed to said stem, a cup-shaped insulating member hermetrically sealed to the other end of said ring, a threaded metallic tube adapted to be screwed into said ring, a plurality of electrodes within the enclosure, leads extending from one of said electrodes to said ring, and means on said leads for screwing said leads to said ring.

3. In an electron discharge device, the combination with an evacuated envelope having a tubular reentrant portion which comprises a pair of axially spaced cylindrical glass portions and an intermediate annular conducting member sealed to said glass portions, of an electrode within said envelope and wholly supported from said conducting member, and a lead-in conductor for said electrode disposed outside the envelope and connected to said conducting member.

4. In an electron discharge device, the combination with an evacuated envelope having a tubular reentrant portion which comprises a pair of axially spaced cylindrical glass portions and an intermediate annular conducting member cond ucting member.

sealed to said glass portions; said annular conducting member having internally and externally threaded surfaces, of an electrode within said envelope, an internally threaded member engaging with the externally threaded surface of said conducting member for supporting said electrode, and a lead-in conductor for said electrode disposed outside the evacuated envelope and having one end-externally threaded for engaging with said internally threaded surface of said HANS MULLER.

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