US2181080A - Double diode - Google Patents

Description

G. F. ELSTON DOUBLE DIODE Nov. 21, 1939..

Filed March 51, 1938 INVENTOR- GEORGE 1-7 ELSTON. BY

ATTORNEY.

Patented Nov. 21, 1939 'UNETEE STATES? DOUBLE DIODE George Elston, Bloomfield, N. J., assignor, by mcsne assignments, to Radio Corporation of America, Delaware New York, N. Y., a corporation of Application March 31, 1938, Serial No. 199,138

1 Claim. My invention relates to electron discharge devices and more particularly to electrode assemblies and their supporting means within the tube.

The object of my invention is to provide an electrode assembly of the unit mount construction which is easy to assemble, rugged in construction, and has good electrical characteristics. The electrodes of my improved tube comprise two diode units mounted in a single unitary structure that is easy to assemble and mount in the envelope, and in which the spacing between cathode and anode remains constant during handling and use.

My invention is defined with particularity in the appended claim but one embodiment thereof is described in detail in the following specification and accompanying drawing in which:

Figure 1 is a perspective view of an electron discharge device embodying my invention, and

Figure 2 is a detail view of an anode constructed according to my invention.

The mount shown in Figure 1, which is particularly adapted for a metal envelope, comprises a metal stem or header with electrode lead-in wires 2 sealed gas-tight in a glass disc or button 3 closing the central portion of the header. The electrode assembly comprises two parallel" insulating spacers 4, such as sheets of mica, perforated with registering openings to receive and support in insulated spaced relation anodes 5, cathodes 6, preferably of the indirectly heated type, and a transverse shield I. The anodes are attached at their ends to the insulating spacers and are held in concentric spaced relation to their respective cathodes. When assembled, the electrodes are attached, preferably by welding, to lead-in conductors 2, a metal shell is placed over the electrode and welded along its rim to the metal header I, and the envelope is degassed, sealed-ofl and attached to a conventional base.

Each anode 5 is cylindrical and has a longitudinal flange H3. The anode may conveniently be made of an oblong sheet of metal, such as nickel, pressed across the middle to form a tubular portion or cylinder, with the end portions of the sheet forming two flap-s 8 which are brought together and spot welded to make the longitudinal flange m. The flange ill may, if desired, be slightly longer than the tubular portion of the anode to project beyond the ends of the anode and provide clearance between the ends of the anode and the spacers. The flange may be stiffened by ribs or channels pressed lengthwise along the flange. The ends of flange ID are formed with ears or tabs 1 I integral with the flaps ditionally strengthened and 8. The cars are inserted through perforations in the spacers and when spread as shown in Figure 1 draw the spacers into snug engagement with ends of the flanges of the two anodes. The two flaps 8 forming the longitudinal flange I0 are bent perpendicular to the plane of the flange to form fins i2 and are provided at their ends near their outer edges with lugs l3 for engaging the spacers a substantial distance from the plane of the flange. The ears ll hold the spacers in snug engagement with the ends of the flange l0 and fins 2 to prevent tilting of the spacer and the lugs l3 effectively prevent rotation of the flange about an axis through the ears II. To insure firm attachment of the anode to the spacer, the distance between lugs I 3 may be made slightly less than the width of the spacer so that the edges of the lugs may cut into the edges of the spacer. These two points by contact, cooperating with the third point of contact at ear ll, secure the parts together. The assembly is adthe diode units are electrically shielded by the transverse shield or partition 1, preferably of metal, inserted at its ends in perforations in the spacers.

An electrode assembly constructed according to my invention is easy to assemble, is rugged in construction, has good electrical characteristics, and is inexpensive to make. The reduced number of parts minimize cost and facilitate assembly of my improved device. The usual anode side rods and anode-to-spacer straps are eliminated. Longitudinal flange It with the perpendicular fins l2 are particularly rigid and are adapted, with the ears H and lugs Hi, to prevent movement of the spacers or anodes. The ears H at one end of the anodes are inserted in one spacer and the cathodes are placed in the anodes and one end inserted in perforations coaxial with the anodes, shield 9 is put in place, and the second insulating spacer is pressed into place. To look the assembly in a rigid unitary structure it is merely necessary to bend or spread the ears H at the ends of the flanges. The assembly may then be placed on the header and the appropriate conductors secured, as by welding, to the electrodes.

Since many modifications may be made in an electrode assembly constructed according to my invention without departing from the scope thereof, it is desired that my invention be limited only by the prior art and by the appended claim.

I claim: v A unitary electrode assembly for electron discharge devices comprising a pair of parallel inend of said flange integral with the flaps extending through an opening in the spacers and a lug extension on each end of each fin, the lug extensions at one end of the fins being on opposite sides of and removed from the plane of said flange, and the edges of the lugs engaging opposite edges of the spacer, the distance between the edges of the lugs being slightly less than the width of the spacer between the lugs.

GEORGE F. ELSTON.

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